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Merge branches 'for-next/52-bit-kva', 'for-next/cpu-topology', 'for-next/error-injection', 'for-next/perf', 'for-next/psci-cpuidle', 'for-next/rng', 'for-next/smpboot', 'for-next/tbi' and 'for-next/tlbi' into for-next/core

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* for-next/52-bit-kva: (25 commits)
  Support for 52-bit virtual addressing in kernel space

* for-next/cpu-topology: (9 commits)
  Move CPU topology parsing into core code and add support for ACPI 6.3

* for-next/error-injection: (2 commits)
  Support for function error injection via kprobes

* for-next/perf: (8 commits)
  Support for i.MX8 DDR PMU and proper SMMUv3 group validation

* for-next/psci-cpuidle: (7 commits)
  Move PSCI idle code into a new CPUidle driver

* for-next/rng: (4 commits)
  Support for 'rng-seed' property being passed in the devicetree

* for-next/smpboot: (3 commits)
  Reduce fragility of secondary CPU bringup in debug configurations

* for-next/tbi: (10 commits)
  Introduce new syscall ABI with relaxed requirements for pointer tags

* for-next/tlbi: (6 commits)
  Handle spurious page faults arising from kernel space
This commit is contained in:
Will Deacon 2019-08-30 12:46:12 +01:00
commit ac12cf85d6
89 changed files with 1975 additions and 972 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
Documentation/admin-guide/perf/imx-ddr.rst Normal file
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@ -0,0 +1,52 @@
=====================================================
Freescale i.MX8 DDR Performance Monitoring Unit (PMU)
=====================================================
There are no performance counters inside the DRAM controller, so performance
signals are brought out to the edge of the controller where a set of 4 x 32 bit
counters is implemented. This is controlled by the CSV modes programed in counter
control register which causes a large number of PERF signals to be generated.
Selection of the value for each counter is done via the config registers. There
is one register for each counter. Counter 0 is special in that it always counts
“time” and when expired causes a lock on itself and the other counters and an
interrupt is raised. If any other counter overflows, it continues counting, and
no interrupt is raised.
The "format" directory describes format of the config (event ID) and config1
(AXI filtering) fields of the perf_event_attr structure, see /sys/bus/event_source/
devices/imx8_ddr0/format/. The "events" directory describes the events types
hardware supported that can be used with perf tool, see /sys/bus/event_source/
devices/imx8_ddr0/events/.
e.g.::
perf stat -a -e imx8_ddr0/cycles/ cmd
perf stat -a -e imx8_ddr0/read/,imx8_ddr0/write/ cmd
AXI filtering is only used by CSV modes 0x41 (axid-read) and 0x42 (axid-write)
to count reading or writing matches filter setting. Filter setting is various
from different DRAM controller implementations, which is distinguished by quirks
in the driver.
* With DDR_CAP_AXI_ID_FILTER quirk.
Filter is defined with two configuration parts:
--AXI_ID defines AxID matching value.
--AXI_MASKING defines which bits of AxID are meaningful for the matching.
0：corresponding bit is masked.
1: corresponding bit is not masked, i.e. used to do the matching.
AXI_ID and AXI_MASKING are mapped on DPCR1 register in performance counter.
When non-masked bits are matching corresponding AXI_ID bits then counter is
incremented. Perf counter is incremented if
AxID && AXI_MASKING == AXI_ID && AXI_MASKING
This filter doesn't support filter different AXI ID for axid-read and axid-write
event at the same time as this filter is shared between counters.
e.g.::
perf stat -a -e imx8_ddr0/axid-read,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
perf stat -a -e imx8_ddr0/axid-write,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
NOTE: axi_mask is inverted in userspace(i.e. set bits are bits to mask), and
it will be reverted in driver automatically. so that the user can just specify
axi_id to monitor a specific id, rather than having to specify axi_mask.
e.g.::
perf stat -a -e imx8_ddr0/axid-read,axi_id=0x12/ cmd, which will monitor ARID=0x12

1
Documentation/arm64/index.rst
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@ -16,6 +16,7 @@ ARM64 Architecture
pointer-authentication
silicon-errata
sve
tagged-address-abi
tagged-pointers
.. only:: subproject and html

27
Documentation/arm64/kasan-offsets.sh Normal file
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@ -0,0 +1,27 @@
#!/bin/sh
# Print out the KASAN_SHADOW_OFFSETS required to place the KASAN SHADOW
# start address at the mid-point of the kernel VA space
print_kasan_offset () {
printf "%02d\t" $1
printf "0x%08x00000000\n" $(( (0xffffffff & (-1 << ($1 - 1 - 32))) \
+ (1 << ($1 - 32 - $2)) \
- (1 << (64 - 32 - $2)) ))
}
echo KASAN_SHADOW_SCALE_SHIFT = 3
printf "VABITS\tKASAN_SHADOW_OFFSET\n"
print_kasan_offset 48 3
print_kasan_offset 47 3
print_kasan_offset 42 3
print_kasan_offset 39 3
print_kasan_offset 36 3
echo
echo KASAN_SHADOW_SCALE_SHIFT = 4
printf "VABITS\tKASAN_SHADOW_OFFSET\n"
print_kasan_offset 48 4
print_kasan_offset 47 4
print_kasan_offset 42 4
print_kasan_offset 39 4
print_kasan_offset 36 4

119
Documentation/arm64/memory.rst
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@ -14,6 +14,10 @@ with the 4KB page configuration, allowing 39-bit (512GB) or 48-bit
64KB pages, only 2 levels of translation tables, allowing 42-bit (4TB)
virtual address, are used but the memory layout is the same.
ARMv8.2 adds optional support for Large Virtual Address space. This is
only available when running with a 64KB page size and expands the
number of descriptors in the first level of translation.
User addresses have bits 63:48 set to 0 while the kernel addresses have
the same bits set to 1. TTBRx selection is given by bit 63 of the
virtual address. The swapper_pg_dir contains only kernel (global)
@ -22,40 +26,43 @@ The swapper_pg_dir address is written to TTBR1 and never written to
TTBR0.
AArch64 Linux memory layout with 4KB pages + 3 levels::
Start End Size Use
-----------------------------------------------------------------------
0000000000000000 0000007fffffffff 512GB user
ffffff8000000000 ffffffffffffffff 512GB kernel
AArch64 Linux memory layout with 4KB pages + 4 levels::
AArch64 Linux memory layout with 4KB pages + 4 levels (48-bit)::
Start End Size Use
-----------------------------------------------------------------------
0000000000000000 0000ffffffffffff 256TB user
ffff000000000000 ffffffffffffffff 256TB kernel
ffff000000000000 ffff7fffffffffff 128TB kernel logical memory map
ffff800000000000 ffff9fffffffffff 32TB kasan shadow region
ffffa00000000000 ffffa00007ffffff 128MB bpf jit region
ffffa00008000000 ffffa0000fffffff 128MB modules
ffffa00010000000 fffffdffbffeffff ~93TB vmalloc
fffffdffbfff0000 fffffdfffe5f8fff ~998MB [guard region]
fffffdfffe5f9000 fffffdfffe9fffff 4124KB fixed mappings
fffffdfffea00000 fffffdfffebfffff 2MB [guard region]
fffffdfffec00000 fffffdffffbfffff 16MB PCI I/O space
fffffdffffc00000 fffffdffffdfffff 2MB [guard region]
fffffdffffe00000 ffffffffffdfffff 2TB vmemmap
ffffffffffe00000 ffffffffffffffff 2MB [guard region]
AArch64 Linux memory layout with 64KB pages + 2 levels::
AArch64 Linux memory layout with 64KB pages + 3 levels (52-bit with HW support)::
Start End Size Use
-----------------------------------------------------------------------
0000000000000000 000003ffffffffff 4TB user
fffffc0000000000 ffffffffffffffff 4TB kernel
AArch64 Linux memory layout with 64KB pages + 3 levels::
Start End Size Use
-----------------------------------------------------------------------
0000000000000000 0000ffffffffffff 256TB user
ffff000000000000 ffffffffffffffff 256TB kernel
For details of the virtual kernel memory layout please see the kernel
booting log.
0000000000000000 000fffffffffffff 4PB user
fff0000000000000 fff7ffffffffffff 2PB kernel logical memory map
fff8000000000000 fffd9fffffffffff 1440TB [gap]
fffda00000000000 ffff9fffffffffff 512TB kasan shadow region
ffffa00000000000 ffffa00007ffffff 128MB bpf jit region
ffffa00008000000 ffffa0000fffffff 128MB modules
ffffa00010000000 fffff81ffffeffff ~88TB vmalloc
fffff81fffff0000 fffffc1ffe58ffff ~3TB [guard region]
fffffc1ffe590000 fffffc1ffe9fffff 4544KB fixed mappings
fffffc1ffea00000 fffffc1ffebfffff 2MB [guard region]
fffffc1ffec00000 fffffc1fffbfffff 16MB PCI I/O space
fffffc1fffc00000 fffffc1fffdfffff 2MB [guard region]
fffffc1fffe00000 ffffffffffdfffff 3968GB vmemmap
ffffffffffe00000 ffffffffffffffff 2MB [guard region]
Translation table lookup with 4KB pages::
@ -83,7 +90,8 @@ Translation table lookup with 64KB pages::
| | | | [15:0] in-page offset
| | | +----------> [28:16] L3 index
| | +--------------------------> [41:29] L2 index
| +-------------------------------> [47:42] L1 index
| +-------------------------------> [47:42] L1 index (48-bit)
| [51:42] L1 index (52-bit)
+-------------------------------------------------> [63] TTBR0/1
@ -96,3 +104,62 @@ ARM64_HARDEN_EL2_VECTORS is selected for particular CPUs.
When using KVM with the Virtualization Host Extensions, no additional
mappings are created, since the host kernel runs directly in EL2.
52-bit VA support in the kernel
-------------------------------
If the ARMv8.2-LVA optional feature is present, and we are running
with a 64KB page size; then it is possible to use 52-bits of address
space for both userspace and kernel addresses. However, any kernel
binary that supports 52-bit must also be able to fall back to 48-bit
at early boot time if the hardware feature is not present.
This fallback mechanism necessitates the kernel .text to be in the
higher addresses such that they are invariant to 48/52-bit VAs. Due
to the kasan shadow being a fraction of the entire kernel VA space,
the end of the kasan shadow must also be in the higher half of the
kernel VA space for both 48/52-bit. (Switching from 48-bit to 52-bit,
the end of the kasan shadow is invariant and dependent on ~0UL,
whilst the start address will "grow" towards the lower addresses).
In order to optimise phys_to_virt and virt_to_phys, the PAGE_OFFSET
is kept constant at 0xFFF0000000000000 (corresponding to 52-bit),
this obviates the need for an extra variable read. The physvirt
offset and vmemmap offsets are computed at early boot to enable
this logic.
As a single binary will need to support both 48-bit and 52-bit VA
spaces, the VMEMMAP must be sized large enough for 52-bit VAs and
also must be sized large enought to accommodate a fixed PAGE_OFFSET.
Most code in the kernel should not need to consider the VA_BITS, for
code that does need to know the VA size the variables are
defined as follows:
VA_BITS constant the *maximum* VA space size
VA_BITS_MIN constant the *minimum* VA space size
vabits_actual variable the *actual* VA space size
Maximum and minimum sizes can be useful to ensure that buffers are
sized large enough or that addresses are positioned close enough for
the "worst" case.
52-bit userspace VAs
--------------------
To maintain compatibility with software that relies on the ARMv8.0
VA space maximum size of 48-bits, the kernel will, by default,
return virtual addresses to userspace from a 48-bit range.
Software can "opt-in" to receiving VAs from a 52-bit space by
specifying an mmap hint parameter that is larger than 48-bit.
For example:
maybe_high_address = mmap(~0UL, size, prot, flags,...);
It is also possible to build a debug kernel that returns addresses
from a 52-bit space by enabling the following kernel config options:
CONFIG_EXPERT=y && CONFIG_ARM64_FORCE_52BIT=y
Note that this option is only intended for debugging applications
and should not be used in production.

156
Documentation/arm64/tagged-address-abi.rst Normal file
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@ -0,0 +1,156 @@
==========================
AArch64 TAGGED ADDRESS ABI
==========================
Authors: Vincenzo Frascino <vincenzo.frascino@arm.com>
Catalin Marinas <catalin.marinas@arm.com>
Date: 21 August 2019
This document describes the usage and semantics of the Tagged Address
ABI on AArch64 Linux.
1. Introduction
---------------
On AArch64 the ``TCR_EL1.TBI0`` bit is set by default, allowing
userspace (EL0) to perform memory accesses through 64-bit pointers with
a non-zero top byte. This document describes the relaxation of the
syscall ABI that allows userspace to pass certain tagged pointers to
kernel syscalls.
2. AArch64 Tagged Address ABI
-----------------------------
From the kernel syscall interface perspective and for the purposes of
this document, a "valid tagged pointer" is a pointer with a potentially
non-zero top-byte that references an address in the user process address
space obtained in one of the following ways:
- ``mmap()`` syscall where either:
- flags have the ``MAP_ANONYMOUS`` bit set or
- the file descriptor refers to a regular file (including those
returned by ``memfd_create()``) or ``/dev/zero``
- ``brk()`` syscall (i.e. the heap area between the initial location of
the program break at process creation and its current location).
- any memory mapped by the kernel in the address space of the process
during creation and with the same restrictions as for ``mmap()`` above
(e.g. data, bss, stack).
The AArch64 Tagged Address ABI has two stages of relaxation depending
how the user addresses are used by the kernel:
1. User addresses not accessed by the kernel but used for address space
management (e.g. ``mmap()``, ``mprotect()``, ``madvise()``). The use
of valid tagged pointers in this context is always allowed.
2. User addresses accessed by the kernel (e.g. ``write()``). This ABI
relaxation is disabled by default and the application thread needs to
explicitly enable it via ``prctl()`` as follows:
- ``PR_SET_TAGGED_ADDR_CTRL``: enable or disable the AArch64 Tagged
Address ABI for the calling thread.
The ``(unsigned int) arg2`` argument is a bit mask describing the
control mode used:
- ``PR_TAGGED_ADDR_ENABLE``: enable AArch64 Tagged Address ABI.
Default status is disabled.
Arguments ``arg3``, ``arg4``, and ``arg5`` must be 0.
- ``PR_GET_TAGGED_ADDR_CTRL``: get the status of the AArch64 Tagged
Address ABI for the calling thread.
Arguments ``arg2``, ``arg3``, ``arg4``, and ``arg5`` must be 0.
The ABI properties described above are thread-scoped, inherited on
clone() and fork() and cleared on exec().
Calling ``prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0)``
returns ``-EINVAL`` if the AArch64 Tagged Address ABI is globally
disabled by ``sysctl abi.tagged_addr_disabled=1``. The default
``sysctl abi.tagged_addr_disabled`` configuration is 0.
When the AArch64 Tagged Address ABI is enabled for a thread, the
following behaviours are guaranteed:
- All syscalls except the cases mentioned in section 3 can accept any
valid tagged pointer.
- The syscall behaviour is undefined for invalid tagged pointers: it may
result in an error code being returned, a (fatal) signal being raised,
or other modes of failure.
- The syscall behaviour for a valid tagged pointer is the same as for
the corresponding untagged pointer.
A definition of the meaning of tagged pointers on AArch64 can be found
in Documentation/arm64/tagged-pointers.rst.
3. AArch64 Tagged Address ABI Exceptions
-----------------------------------------
The following system call parameters must be untagged regardless of the
ABI relaxation:
- ``prctl()`` other than pointers to user data either passed directly or
indirectly as arguments to be accessed by the kernel.
- ``ioctl()`` other than pointers to user data either passed directly or
indirectly as arguments to be accessed by the kernel.
- ``shmat()`` and ``shmdt()``.
Any attempt to use non-zero tagged pointers may result in an error code
being returned, a (fatal) signal being raised, or other modes of
failure.
4. Example of correct usage
---------------------------
.. code-block:: c
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#define PR_SET_TAGGED_ADDR_CTRL 55
#define PR_TAGGED_ADDR_ENABLE (1UL << 0)
#define TAG_SHIFT 56
int main(void)
{
int tbi_enabled = 0;
unsigned long tag = 0;
char *ptr;
/* check/enable the tagged address ABI */
if (!prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0))
tbi_enabled = 1;
/* memory allocation */
ptr = mmap(NULL, sysconf(_SC_PAGE_SIZE), PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (ptr == MAP_FAILED)
return 1;
/* set a non-zero tag if the ABI is available */
if (tbi_enabled)
tag = rand() & 0xff;
ptr = (char *)((unsigned long)ptr | (tag << TAG_SHIFT));
/* memory access to a tagged address */
strcpy(ptr, "tagged pointer\n");
/* syscall with a tagged pointer */
write(1, ptr, strlen(ptr));
return 0;
}

21
Documentation/arm64/tagged-pointers.rst
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@ -20,7 +20,9 @@ Passing tagged addresses to the kernel
--------------------------------------
All interpretation of userspace memory addresses by the kernel assumes
an address tag of 0x00.
an address tag of 0x00, unless the application enables the AArch64
Tagged Address ABI explicitly
(Documentation/arm64/tagged-address-abi.rst).
This includes, but is not limited to, addresses found in:
@ -33,13 +35,15 @@ This includes, but is not limited to, addresses found in:
- the frame pointer (x29) and frame records, e.g. when interpreting
them to generate a backtrace or call graph.
Using non-zero address tags in any of these locations may result in an
error code being returned, a (fatal) signal being raised, or other modes
of failure.
Using non-zero address tags in any of these locations when the
userspace application did not enable the AArch64 Tagged Address ABI may
result in an error code being returned, a (fatal) signal being raised,
or other modes of failure.
For these reasons, passing non-zero address tags to the kernel via
system calls is forbidden, and using a non-zero address tag for sp is
strongly discouraged.
For these reasons, when the AArch64 Tagged Address ABI is disabled,
passing non-zero address tags to the kernel via system calls is
forbidden, and using a non-zero address tag for sp is strongly
discouraged.
Programs maintaining a frame pointer and frame records that use non-zero
address tags may suffer impaired or inaccurate debug and profiling
@ -59,6 +63,9 @@ be preserved.
The architecture prevents the use of a tagged PC, so the upper byte will
be set to a sign-extension of bit 55 on exception return.
This behaviour is maintained when the AArch64 Tagged Address ABI is
enabled.
Other considerations
--------------------

258
Documentation/devicetree/bindings/arm/topology.txt → Documentation/devicetree/bindings/cpu/cpu-topology.txt
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@ -1,21 +1,19 @@
===========================================
ARM topology binding description
CPU topology binding description
===========================================
===========================================
1 - Introduction
===========================================
In an ARM system, the hierarchy of CPUs is defined through three entities that
In a SMP system, the hierarchy of CPUs is defined through three entities that
are used to describe the layout of physical CPUs in the system:
- socket
- cluster
- core
- thread
The cpu nodes (bindings defined in [1]) represent the devices that
correspond to physical CPUs and are to be mapped to the hierarchy levels.
The bottom hierarchy level sits at core or thread level depending on whether
symmetric multi-threading (SMT) is supported or not.
@ -24,33 +22,31 @@ threads existing in the system and map to the hierarchy level "thread" above.
In systems where SMT is not supported "cpu" nodes represent all cores present
in the system and map to the hierarchy level "core" above.
ARM topology bindings allow one to associate cpu nodes with hierarchical groups
CPU topology bindings allow one to associate cpu nodes with hierarchical groups
corresponding to the system hierarchy; syntactically they are defined as device
tree nodes.
The remainder of this document provides the topology bindings for ARM, based
on the Devicetree Specification, available from:
Currently, only ARM/RISC-V intend to use this cpu topology binding but it may be
used for any other architecture as well.
https://www.devicetree.org/specifications/
The cpu nodes, as per bindings defined in [4], represent the devices that
correspond to physical CPUs and are to be mapped to the hierarchy levels.
If not stated otherwise, whenever a reference to a cpu node phandle is made its
value must point to a cpu node compliant with the cpu node bindings as
documented in [1].
A topology description containing phandles to cpu nodes that are not compliant
with bindings standardized in [1] is therefore considered invalid.
with bindings standardized in [4] is therefore considered invalid.
===========================================
2 - cpu-map node
===========================================
The ARM CPU topology is defined within the cpu-map node, which is a direct
The ARM/RISC-V CPU topology is defined within the cpu-map node, which is a direct
child of the cpus node and provides a container where the actual topology
nodes are listed.
- cpu-map node
Usage: Optional - On ARM SMP systems provide CPUs topology to the OS.
ARM uniprocessor systems do not require a topology
Usage: Optional - On SMP systems provide CPUs topology to the OS.
Uniprocessor systems do not require a topology
description and therefore should not define a
cpu-map node.
@ -63,21 +59,23 @@ nodes are listed.
The cpu-map node's child nodes can be:
- one or more cluster nodes
- one or more cluster nodes or
- one or more socket nodes in a multi-socket system
Any other configuration is considered invalid.
The cpu-map node can only contain three types of child nodes:
The cpu-map node can only contain 4 types of child nodes:
- socket node
- cluster node
- core node
- thread node
whose bindings are described in paragraph 3.
The nodes describing the CPU topology (cluster/core/thread) can only
be defined within the cpu-map node and every core/thread in the system
must be defined within the topology. Any other configuration is
The nodes describing the CPU topology (socket/cluster/core/thread) can
only be defined within the cpu-map node and every core/thread in the
system must be defined within the topology. Any other configuration is
invalid and therefore must be ignored.
===========================================
@ -85,26 +83,44 @@ invalid and therefore must be ignored.
===========================================
cpu-map child nodes must follow a naming convention where the node name
must be "clusterN", "coreN", "threadN" depending on the node type (ie
cluster/core/thread) (where N = {0, 1, ...} is the node number; nodes which
are siblings within a single common parent node must be given a unique and
must be "socketN", "clusterN", "coreN", "threadN" depending on the node type
(ie socket/cluster/core/thread) (where N = {0, 1, ...} is the node number; nodes
which are siblings within a single common parent node must be given a unique and
sequential N value, starting from 0).
cpu-map child nodes which do not share a common parent node can have the same
name (ie same number N as other cpu-map child nodes at different device tree
levels) since name uniqueness will be guaranteed by the device tree hierarchy.
===========================================
3 - cluster/core/thread node bindings
3 - socket/cluster/core/thread node bindings
===========================================
Bindings for cluster/cpu/thread nodes are defined as follows:
Bindings for socket/cluster/cpu/thread nodes are defined as follows:
- socket node
Description: must be declared within a cpu-map node, one node
per physical socket in the system. A system can
contain single or multiple physical socket.
The association of sockets and NUMA nodes is beyond
the scope of this bindings, please refer [2] for
NUMA bindings.
This node is optional for a single socket system.
The socket node name must be "socketN" as described in 2.1 above.
A socket node can not be a leaf node.
A socket node's child nodes must be one or more cluster nodes.
Any other configuration is considered invalid.
- cluster node
Description: must be declared within a cpu-map node, one node
per cluster. A system can contain several layers of
clustering and cluster nodes can be contained in parent
cluster nodes.
clustering within a single physical socket and cluster
nodes can be contained in parent cluster nodes.
The cluster node name must be "clusterN" as described in 2.1 above.
A cluster node can not be a leaf node.
@ -164,90 +180,93 @@ Bindings for cluster/cpu/thread nodes are defined as follows:
4 - Example dts
===========================================
Example 1 (ARM 64-bit, 16-cpu system, two clusters of clusters):
Example 1 (ARM 64-bit, 16-cpu system, two clusters of clusters in a single
physical socket):
cpus {
#size-cells = <0>;
#address-cells = <2>;
cpu-map {
cluster0 {
socket0 {
cluster0 {
core0 {
thread0 {
cpu = <&CPU0>;
cluster0 {
core0 {
thread0 {
cpu = <&CPU0>;
};
thread1 {
cpu = <&CPU1>;
};
};
thread1 {
cpu = <&CPU1>;
core1 {
thread0 {
cpu = <&CPU2>;
};
thread1 {
cpu = <&CPU3>;
};
};
};
core1 {
thread0 {
cpu = <&CPU2>;
cluster1 {
core0 {
thread0 {
cpu = <&CPU4>;
};
thread1 {
cpu = <&CPU5>;
};
};
thread1 {
cpu = <&CPU3>;
core1 {
thread0 {
cpu = <&CPU6>;
};
thread1 {
cpu = <&CPU7>;
};
};
};
};
cluster1 {
core0 {
thread0 {
cpu = <&CPU4>;
cluster0 {
core0 {
thread0 {
cpu = <&CPU8>;
};
thread1 {
cpu = <&CPU9>;
};
};
thread1 {
cpu = <&CPU5>;
core1 {
thread0 {
cpu = <&CPU10>;
};
thread1 {
cpu = <&CPU11>;
};
};
};
core1 {
thread0 {
cpu = <&CPU6>;
cluster1 {
core0 {
thread0 {
cpu = <&CPU12>;
};
thread1 {
cpu = <&CPU13>;
};
};
thread1 {
cpu = <&CPU7>;
};
};
};
};
cluster1 {
cluster0 {
core0 {
thread0 {
cpu = <&CPU8>;
};
thread1 {
cpu = <&CPU9>;
};
};
core1 {
thread0 {
cpu = <&CPU10>;
};
thread1 {
cpu = <&CPU11>;
};
};
};
cluster1 {
core0 {
thread0 {
cpu = <&CPU12>;
};
thread1 {
cpu = <&CPU13>;
};
};
core1 {
thread0 {
cpu = <&CPU14>;
};
thread1 {
cpu = <&CPU15>;
core1 {
thread0 {
cpu = <&CPU14>;
};
thread1 {
cpu = <&CPU15>;
};
};
};
};
@ -470,6 +489,65 @@ cpus {
};
};
Example 3: HiFive Unleashed (RISC-V 64 bit, 4 core system)
{
#address-cells = <2>;
#size-cells = <2>;
compatible = "sifive,fu540g", "sifive,fu500";
model = "sifive,hifive-unleashed-a00";
...
cpus {
#address-cells = <1>;
#size-cells = <0>;
cpu-map {
socket0 {
cluster0 {
core0 {
cpu = <&CPU1>;
};
core1 {
cpu = <&CPU2>;
};
core2 {
cpu0 = <&CPU2>;
};
core3 {
cpu0 = <&CPU3>;
};
};
};
};
CPU1: cpu@1 {
device_type = "cpu";
compatible = "sifive,rocket0", "riscv";
reg = <0x1>;
}
CPU2: cpu@2 {
device_type = "cpu";
compatible = "sifive,rocket0", "riscv";
reg = <0x2>;
}
CPU3: cpu@3 {
device_type = "cpu";
compatible = "sifive,rocket0", "riscv";
reg = <0x3>;
}
CPU4: cpu@4 {
device_type = "cpu";
compatible = "sifive,rocket0", "riscv";
reg = <0x4>;
}
}
};
===============================================================================
[1] ARM Linux kernel documentation
Documentation/devicetree/bindings/arm/cpus.yaml
[2] Devicetree NUMA binding description
Documentation/devicetree/bindings/numa.txt
[3] RISC-V Linux kernel documentation
Documentation/devicetree/bindings/riscv/cpus.txt
[4] https://www.devicetree.org/specifications/

16
MAINTAINERS
View File

@ -4290,6 +4290,14 @@ S: Supported
F: drivers/cpuidle/cpuidle-exynos.c
F: arch/arm/mach-exynos/pm.c
CPUIDLE DRIVER - ARM PSCI
M: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
M: Sudeep Holla <sudeep.holla@arm.com>
L: linux-pm@vger.kernel.org
L: linux-arm-kernel@lists.infradead.org
S: Supported
F: drivers/cpuidle/cpuidle-psci.c
CPU IDLE TIME MANAGEMENT FRAMEWORK
M: "Rafael J. Wysocki" <rjw@rjwysocki.net>
M: Daniel Lezcano <daniel.lezcano@linaro.org>
@ -6439,6 +6447,7 @@ M: Frank Li <Frank.li@nxp.com>
L: linux-arm-kernel@lists.infradead.org
S: Maintained
F: drivers/perf/fsl_imx8_ddr_perf.c
F: Documentation/admin-guide/perf/imx-ddr.rst
F: Documentation/devicetree/bindings/perf/fsl-imx-ddr.txt
FREESCALE IMX LPI2C DRIVER
@ -6724,6 +6733,13 @@ W: https://linuxtv.org
S: Maintained
F: drivers/media/radio/radio-gemtek*
GENERIC ARCHITECTURE TOPOLOGY
M: Sudeep Holla <sudeep.holla@arm.com>
L: linux-kernel@vger.kernel.org
S: Maintained
F: drivers/base/arch_topology.c
F: include/linux/arch_topology.h
GENERIC GPIO I2C DRIVER
M: Wolfram Sang <wsa+renesas@sang-engineering.com>
S: Supported

20
arch/arm/include/asm/topology.h
View File

@ -5,26 +5,6 @@
#ifdef CONFIG_ARM_CPU_TOPOLOGY
#include <linux/cpumask.h>
struct cputopo_arm {
int thread_id;
int core_id;
int socket_id;
cpumask_t thread_sibling;
cpumask_t core_sibling;
};
extern struct cputopo_arm cpu_topology[NR_CPUS];
#define topology_physical_package_id(cpu) (cpu_topology[cpu].socket_id)
#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)
void init_cpu_topology(void);
void store_cpu_topology(unsigned int cpuid);
const struct cpumask *cpu_coregroup_mask(int cpu);
#include <linux/arch_topology.h>
/* Replace task scheduler's default frequency-invariant accounting */

60
arch/arm/kernel/topology.c
View File

@ -177,17 +177,6 @@ static inline void parse_dt_topology(void) {}
static inline void update_cpu_capacity(unsigned int cpuid) {}
#endif
/*
* cpu topology table
*/
struct cputopo_arm cpu_topology[NR_CPUS];
EXPORT_SYMBOL_GPL(cpu_topology);
const struct cpumask *cpu_coregroup_mask(int cpu)
{
return &cpu_topology[cpu].core_sibling;
}
/*
* The current assumption is that we can power gate each core independently.
* This will be superseded by DT binding once available.
@ -197,32 +186,6 @@ const struct cpumask *cpu_corepower_mask(int cpu)
return &cpu_topology[cpu].thread_sibling;
}
static void update_siblings_masks(unsigned int cpuid)
{
struct cputopo_arm *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
int cpu;
/* update core and thread sibling masks */
for_each_possible_cpu(cpu) {
cpu_topo = &cpu_topology[cpu];
if (cpuid_topo->socket_id != cpu_topo->socket_id)
continue;
cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
if (cpu != cpuid)
cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
if (cpuid_topo->core_id != cpu_topo->core_id)
continue;
cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
if (cpu != cpuid)
cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
}
smp_wmb();
}
/*
* store_cpu_topology is called at boot when only one cpu is running
* and with the mutex cpu_hotplug.lock locked, when several cpus have booted,
@ -230,7 +193,7 @@ static void update_siblings_masks(unsigned int cpuid)
*/
void store_cpu_topology(unsigned int cpuid)
{
struct cputopo_arm *cpuid_topo = &cpu_topology[cpuid];
struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
unsigned int mpidr;
/* If the cpu topology has been already set, just return */
@ -250,12 +213,12 @@ void store_cpu_topology(unsigned int cpuid)
/* core performance interdependency */
cpuid_topo->thread_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
cpuid_topo->socket_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
} else {
/* largely independent cores */
cpuid_topo->thread_id = -1;
cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cpuid_topo->socket_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
}
} else {
/*
@ -265,7 +228,7 @@ void store_cpu_topology(unsigned int cpuid)
*/
cpuid_topo->thread_id = -1;
cpuid_topo->core_id = 0;
cpuid_topo->socket_id = -1;
cpuid_topo->package_id = -1;
}
update_siblings_masks(cpuid);
@ -275,7 +238,7 @@ void store_cpu_topology(unsigned int cpuid)
pr_info("CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n",
cpuid, cpu_topology[cpuid].thread_id,
cpu_topology[cpuid].core_id,
cpu_topology[cpuid].socket_id, mpidr);
cpu_topology[cpuid].package_id, mpidr);
}
static inline int cpu_corepower_flags(void)
@ -298,18 +261,7 @@ static struct sched_domain_topology_level arm_topology[] = {
*/
void __init init_cpu_topology(void)
{
unsigned int cpu;
/* init core mask and capacity */
for_each_possible_cpu(cpu) {
struct cputopo_arm *cpu_topo = &(cpu_topology[cpu]);
cpu_topo->thread_id = -1;
cpu_topo->core_id = -1;
cpu_topo->socket_id = -1;
cpumask_clear(&cpu_topo->core_sibling);
cpumask_clear(&cpu_topo->thread_sibling);
}
reset_cpu_topology();
smp_wmb();
parse_dt_topology();

41
arch/arm64/Kconfig
View File

@ -148,6 +148,7 @@ config ARM64
select HAVE_FAST_GUP
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_ERROR_INJECTION
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_GCC_PLUGINS
select HAVE_HW_BREAKPOINT if PERF_EVENTS
@ -286,7 +287,7 @@ config PGTABLE_LEVELS
int
default 2 if ARM64_16K_PAGES && ARM64_VA_BITS_36
default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
default 3 if ARM64_64K_PAGES && (ARM64_VA_BITS_48 || ARM64_USER_VA_BITS_52)
default 3 if ARM64_64K_PAGES && (ARM64_VA_BITS_48 || ARM64_VA_BITS_52)
default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
default 3 if ARM64_16K_PAGES && ARM64_VA_BITS_47
default 4 if !ARM64_64K_PAGES && ARM64_VA_BITS_48
@ -297,6 +298,21 @@ config ARCH_SUPPORTS_UPROBES
config ARCH_PROC_KCORE_TEXT
def_bool y
config KASAN_SHADOW_OFFSET
hex
depends on KASAN
default 0xdfffa00000000000 if (ARM64_VA_BITS_48 || ARM64_VA_BITS_52) && !KASAN_SW_TAGS
default 0xdfffd00000000000 if ARM64_VA_BITS_47 && !KASAN_SW_TAGS
default 0xdffffe8000000000 if ARM64_VA_BITS_42 && !KASAN_SW_TAGS
default 0xdfffffd000000000 if ARM64_VA_BITS_39 && !KASAN_SW_TAGS
default 0xdffffffa00000000 if ARM64_VA_BITS_36 && !KASAN_SW_TAGS
default 0xefff900000000000 if (ARM64_VA_BITS_48 || ARM64_VA_BITS_52) && KASAN_SW_TAGS
default 0xefffc80000000000 if ARM64_VA_BITS_47 && KASAN_SW_TAGS
default 0xeffffe4000000000 if ARM64_VA_BITS_42 && KASAN_SW_TAGS
default 0xefffffc800000000 if ARM64_VA_BITS_39 && KASAN_SW_TAGS
default 0xeffffff900000000 if ARM64_VA_BITS_36 && KASAN_SW_TAGS
default 0xffffffffffffffff
source "arch/arm64/Kconfig.platforms"
menu "Kernel Features"
@ -744,13 +760,14 @@ config ARM64_VA_BITS_47
config ARM64_VA_BITS_48
bool "48-bit"
config ARM64_USER_VA_BITS_52
bool "52-bit (user)"
config ARM64_VA_BITS_52
bool "52-bit"
depends on ARM64_64K_PAGES && (ARM64_PAN || !ARM64_SW_TTBR0_PAN)
help
Enable 52-bit virtual addressing for userspace when explicitly
requested via a hint to mmap(). The kernel will continue to
use 48-bit virtual addresses for its own mappings.
requested via a hint to mmap(). The kernel will also use 52-bit
virtual addresses for its own mappings (provided HW support for
this feature is available, otherwise it reverts to 48-bit).
NOTE: Enabling 52-bit virtual addressing in conjunction with
ARMv8.3 Pointer Authentication will result in the PAC being
@ -763,7 +780,7 @@ endchoice
config ARM64_FORCE_52BIT
bool "Force 52-bit virtual addresses for userspace"
depends on ARM64_USER_VA_BITS_52 && EXPERT
depends on ARM64_VA_BITS_52 && EXPERT
help
For systems with 52-bit userspace VAs enabled, the kernel will attempt
to maintain compatibility with older software by providing 48-bit VAs
@ -780,7 +797,8 @@ config ARM64_VA_BITS
default 39 if ARM64_VA_BITS_39
default 42 if ARM64_VA_BITS_42
default 47 if ARM64_VA_BITS_47
default 48 if ARM64_VA_BITS_48 || ARM64_USER_VA_BITS_52
default 48 if ARM64_VA_BITS_48
default 52 if ARM64_VA_BITS_52
choice
prompt "Physical address space size"
@ -1110,6 +1128,15 @@ config ARM64_SW_TTBR0_PAN
zeroed area and reserved ASID. The user access routines
restore the valid TTBR0_EL1 temporarily.
config ARM64_TAGGED_ADDR_ABI
bool "Enable the tagged user addresses syscall ABI"
default y
help
When this option is enabled, user applications can opt in to a
relaxed ABI via prctl() allowing tagged addresses to be passed
to system calls as pointer arguments. For details, see
Documentation/arm64/tagged-address-abi.txt.
menuconfig COMPAT
bool "Kernel support for 32-bit EL0"
depends on ARM64_4K_PAGES || EXPERT

8
arch/arm64/Makefile
View File

@ -126,14 +126,6 @@ KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
# - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
# in 32-bit arithmetic
KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
- (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
export TEXT_OFFSET GZFLAGS
core-y += arch/arm64/

17
arch/arm64/include/asm/assembler.h
View File

@ -338,6 +338,13 @@ alternative_endif
bfi \valreg, \t0sz, #TCR_T0SZ_OFFSET, #TCR_TxSZ_WIDTH
.endm
/*
* tcr_set_t1sz - update TCR.T1SZ
*/
.macro tcr_set_t1sz, valreg, t1sz
bfi \valreg, \t1sz, #TCR_T1SZ_OFFSET, #TCR_TxSZ_WIDTH
.endm
/*
* tcr_compute_pa_size - set TCR.(I)PS to the highest supported
* ID_AA64MMFR0_EL1.PARange value
@ -527,9 +534,13 @@ USER(\label, ic ivau, \tmp2) // invalidate I line PoU
* In future this may be nop'ed out when dealing with 52-bit kernel VAs.
* ttbr: Value of ttbr to set, modified.
*/
.macro offset_ttbr1, ttbr
#ifdef CONFIG_ARM64_USER_VA_BITS_52
.macro offset_ttbr1, ttbr, tmp
#ifdef CONFIG_ARM64_VA_BITS_52
mrs_s \tmp, SYS_ID_AA64MMFR2_EL1
and \tmp, \tmp, #(0xf << ID_AA64MMFR2_LVA_SHIFT)
cbnz \tmp, .Lskipoffs_\@
orr \ttbr, \ttbr, #TTBR1_BADDR_4852_OFFSET
.Lskipoffs_\@ :
#endif
.endm
@ -539,7 +550,7 @@ USER(\label, ic ivau, \tmp2) // invalidate I line PoU
* to be nop'ed out when dealing with 52-bit kernel VAs.
*/
.macro restore_ttbr1, ttbr
#ifdef CONFIG_ARM64_USER_VA_BITS_52
#ifdef CONFIG_ARM64_VA_BITS_52
bic \ttbr, \ttbr, #TTBR1_BADDR_4852_OFFSET
#endif
.endm

3
arch/arm64/include/asm/cpu_ops.h
View File

@ -23,6 +23,8 @@
* @cpu_boot: Boots a cpu into the kernel.
* @cpu_postboot: Optionally, perform any post-boot cleanup or necesary
* synchronisation. Called from the cpu being booted.
* @cpu_can_disable: Determines whether a CPU can be disabled based on
* mechanism-specific information.
* @cpu_disable: Prepares a cpu to die. May fail for some mechanism-specific
* reason, which will cause the hot unplug to be aborted. Called
* from the cpu to be killed.
@ -42,6 +44,7 @@ struct cpu_operations {
int (*cpu_boot)(unsigned int);
void (*cpu_postboot)(void);
#ifdef CONFIG_HOTPLUG_CPU
bool (*cpu_can_disable)(unsigned int cpu);
int (*cpu_disable)(unsigned int cpu);
void (*cpu_die)(unsigned int cpu);
int (*cpu_kill)(unsigned int cpu);

4
arch/arm64/include/asm/efi.h
View File

@ -79,7 +79,7 @@ static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
/*
* On arm64, we have to ensure that the initrd ends up in the linear region,
* which is a 1 GB aligned region of size '1UL << (VA_BITS - 1)' that is
* which is a 1 GB aligned region of size '1UL << (VA_BITS_MIN - 1)' that is
* guaranteed to cover the kernel Image.
*
* Since the EFI stub is part of the kernel Image, we can relax the
@ -90,7 +90,7 @@ static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
unsigned long image_addr)
{
return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS - 1));
return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS_MIN - 1));
}
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)

11
arch/arm64/include/asm/kasan.h
View File

@ -18,11 +18,8 @@
* KASAN_SHADOW_START: beginning of the kernel virtual addresses.
* KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
* where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
*/
#define KASAN_SHADOW_START (VA_START)
#define KASAN_SHADOW_END (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
/*
*
* KASAN_SHADOW_OFFSET:
* This value is used to map an address to the corresponding shadow
* address by the following formula:
* shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
@ -33,8 +30,8 @@
* KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
* (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
*/
#define KASAN_SHADOW_OFFSET (KASAN_SHADOW_END - (1ULL << \
(64 - KASAN_SHADOW_SCALE_SHIFT)))
#define _KASAN_SHADOW_START(va) (KASAN_SHADOW_END - (1UL << ((va) - KASAN_SHADOW_SCALE_SHIFT)))
#define KASAN_SHADOW_START _KASAN_SHADOW_START(vabits_actual)
void kasan_init(void);
void kasan_copy_shadow(pgd_t *pgdir);

143
arch/arm64/include/asm/memory.h
View File

@ -12,10 +12,10 @@
#include <linux/compiler.h>
#include <linux/const.h>
#include <linux/sizes.h>
#include <linux/types.h>
#include <asm/bug.h>
#include <asm/page-def.h>
#include <linux/sizes.h>
/*
* Size of the PCI I/O space. This must remain a power of two so that
@ -26,37 +26,50 @@
/*
* VMEMMAP_SIZE - allows the whole linear region to be covered by
* a struct page array
*
* If we are configured with a 52-bit kernel VA then our VMEMMAP_SIZE
* needs to cover the memory region from the beginning of the 52-bit
* PAGE_OFFSET all the way to PAGE_END for 48-bit. This allows us to
* keep a constant PAGE_OFFSET and "fallback" to using the higher end
* of the VMEMMAP where 52-bit support is not available in hardware.
*/
#define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT))
#define VMEMMAP_SIZE ((_PAGE_END(VA_BITS_MIN) - PAGE_OFFSET) \
>> (PAGE_SHIFT - STRUCT_PAGE_MAX_SHIFT))
/*
* PAGE_OFFSET - the virtual address of the start of the linear map (top
* (VA_BITS - 1))
* KIMAGE_VADDR - the virtual address of the start of the kernel image
* PAGE_OFFSET - the virtual address of the start of the linear map, at the
* start of the TTBR1 address space.
* PAGE_END - the end of the linear map, where all other kernel mappings begin.
* KIMAGE_VADDR - the virtual address of the start of the kernel image.
* VA_BITS - the maximum number of bits for virtual addresses.
* VA_START - the first kernel virtual address.
*/
#define VA_BITS (CONFIG_ARM64_VA_BITS)
#define VA_START (UL(0xffffffffffffffff) - \
(UL(1) << VA_BITS) + 1)
#define PAGE_OFFSET (UL(0xffffffffffffffff) - \
(UL(1) << (VA_BITS - 1)) + 1)
#define _PAGE_OFFSET(va) (-(UL(1) << (va)))
#define PAGE_OFFSET (_PAGE_OFFSET(VA_BITS))
#define KIMAGE_VADDR (MODULES_END)
#define BPF_JIT_REGION_START (VA_START + KASAN_SHADOW_SIZE)
#define BPF_JIT_REGION_START (KASAN_SHADOW_END)
#define BPF_JIT_REGION_SIZE (SZ_128M)
#define BPF_JIT_REGION_END (BPF_JIT_REGION_START + BPF_JIT_REGION_SIZE)
#define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
#define MODULES_VADDR (BPF_JIT_REGION_END)
#define MODULES_VSIZE (SZ_128M)
#define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE)
#define VMEMMAP_START (-VMEMMAP_SIZE - SZ_2M)
#define PCI_IO_END (VMEMMAP_START - SZ_2M)
#define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
#define FIXADDR_TOP (PCI_IO_START - SZ_2M)
#define KERNEL_START _text
#define KERNEL_END _end
#if VA_BITS > 48
#define VA_BITS_MIN (48)
#else
#define VA_BITS_MIN (VA_BITS)
#endif
#ifdef CONFIG_ARM64_USER_VA_BITS_52
#define _PAGE_END(va) (-(UL(1) << ((va) - 1)))
#define KERNEL_START _text
#define KERNEL_END _end
#ifdef CONFIG_ARM64_VA_BITS_52
#define MAX_USER_VA_BITS 52
#else
#define MAX_USER_VA_BITS VA_BITS
@ -68,12 +81,14 @@
* significantly, so double the (minimum) stack size when they are in use.
*/
#ifdef CONFIG_KASAN
#define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
#define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
#define KASAN_SHADOW_END ((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) \
+ KASAN_SHADOW_OFFSET)
#define KASAN_THREAD_SHIFT 1
#else
#define KASAN_SHADOW_SIZE (0)
#define KASAN_THREAD_SHIFT 0
#endif
#define KASAN_SHADOW_END (_PAGE_END(VA_BITS_MIN))
#endif /* CONFIG_KASAN */
#define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT)
@ -117,14 +132,14 @@
* 16 KB granule: 128 level 3 entries, with contiguous bit
* 64 KB granule: 32 level 3 entries, with contiguous bit
*/
#define SEGMENT_ALIGN SZ_2M
#define SEGMENT_ALIGN SZ_2M
#else
/*
* 4 KB granule: 16 level 3 entries, with contiguous bit
* 16 KB granule: 4 level 3 entries, without contiguous bit
* 64 KB granule: 1 level 3 entry
*/
#define SEGMENT_ALIGN SZ_64K
#define SEGMENT_ALIGN SZ_64K
#endif
/*
@ -157,10 +172,13 @@
#endif
#ifndef __ASSEMBLY__
extern u64 vabits_actual;
#define PAGE_END (_PAGE_END(vabits_actual))
#include <linux/bitops.h>
#include <linux/mmdebug.h>
extern s64 physvirt_offset;
extern s64 memstart_addr;
/* PHYS_OFFSET - the physical address of the start of memory. */
#define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
@ -176,9 +194,6 @@ static inline unsigned long kaslr_offset(void)
return kimage_vaddr - KIMAGE_VADDR;
}
/* the actual size of a user virtual address */
extern u64 vabits_user;
/*
* Allow all memory at the discovery stage. We will clip it later.
*/
@ -201,23 +216,23 @@ extern u64 vabits_user;
* pass on to access_ok(), for instance.
*/
#define untagged_addr(addr) \
((__typeof__(addr))sign_extend64((u64)(addr), 55))
((__force __typeof__(addr))sign_extend64((__force u64)(addr), 55))
#ifdef CONFIG_KASAN_SW_TAGS
#define __tag_shifted(tag) ((u64)(tag) << 56)
#define __tag_set(addr, tag) (__typeof__(addr))( \
((u64)(addr) & ~__tag_shifted(0xff)) | __tag_shifted(tag))
#define __tag_reset(addr) untagged_addr(addr)
#define __tag_get(addr) (__u8)((u64)(addr) >> 56)
#else
static inline const void *__tag_set(const void *addr, u8 tag)
{
return addr;
}
#define __tag_shifted(tag) 0UL
#define __tag_reset(addr) (addr)
#define __tag_get(addr) 0
#endif
#endif /* CONFIG_KASAN_SW_TAGS */
static inline const void *__tag_set(const void *addr, u8 tag)
{
u64 __addr = (u64)addr & ~__tag_shifted(0xff);
return (const void *)(__addr | __tag_shifted(tag));
}
/*
* Physical vs virtual RAM address space conversion. These are
@ -227,19 +242,18 @@ static inline const void *__tag_set(const void *addr, u8 tag)
/*
* The linear kernel range starts in the middle of the virtual adddress
* The linear kernel range starts at the bottom of the virtual address
* space. Testing the top bit for the start of the region is a
* sufficient check.
* sufficient check and avoids having to worry about the tag.
*/
#define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1)))
#define __is_lm_address(addr) (!(((u64)addr) & BIT(vabits_actual - 1)))
#define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)
#define __lm_to_phys(addr) (((addr) + physvirt_offset))
#define __kimg_to_phys(addr) ((addr) - kimage_voffset)
#define __virt_to_phys_nodebug(x) ({ \
phys_addr_t __x = (phys_addr_t)(x); \
__is_lm_address(__x) ? __lm_to_phys(__x) : \
__kimg_to_phys(__x); \
phys_addr_t __x = (phys_addr_t)(__tag_reset(x)); \
__is_lm_address(__x) ? __lm_to_phys(__x) : __kimg_to_phys(__x); \
})
#define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x))
@ -250,9 +264,9 @@ extern phys_addr_t __phys_addr_symbol(unsigned long x);
#else
#define __virt_to_phys(x) __virt_to_phys_nodebug(x)
#define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
#endif
#endif /* CONFIG_DEBUG_VIRTUAL */
#define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
#define __phys_to_virt(x) ((unsigned long)((x) - physvirt_offset))
#define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset))
/*
@ -286,41 +300,38 @@ static inline void *phys_to_virt(phys_addr_t x)
#define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x))
#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
#define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x)))
#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
#define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x)))
#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
/*
* virt_to_page(k) convert a _valid_ virtual address to struct page *
* virt_addr_valid(k) indicates whether a virtual address is valid
* virt_to_page(x) convert a _valid_ virtual address to struct page *
* virt_addr_valid(x) indicates whether a virtual address is valid
*/
#define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
#if !defined(CONFIG_SPARSEMEM_VMEMMAP) || defined(CONFIG_DEBUG_VIRTUAL)
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#define virt_to_page(x) pfn_to_page(virt_to_pfn(x))
#else
#define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
#define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
#define page_to_virt(page) ({ \
unsigned long __addr = \
((__page_to_voff(page)) | PAGE_OFFSET); \
const void *__addr_tag = \
__tag_set((void *)__addr, page_kasan_tag(page)); \
((void *)__addr_tag); \
#define page_to_virt(x) ({ \
__typeof__(x) __page = x; \
u64 __idx = ((u64)__page - VMEMMAP_START) / sizeof(struct page);\
u64 __addr = PAGE_OFFSET + (__idx * PAGE_SIZE); \
(void *)__tag_set((const void *)__addr, page_kasan_tag(__page));\
})
#define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))
#define virt_to_page(x) ({ \
u64 __idx = (__tag_reset((u64)x) - PAGE_OFFSET) / PAGE_SIZE; \
u64 __addr = VMEMMAP_START + (__idx * sizeof(struct page)); \
(struct page *)__addr; \
})
#endif /* !CONFIG_SPARSEMEM_VMEMMAP || CONFIG_DEBUG_VIRTUAL */
#define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
+ PHYS_OFFSET) >> PAGE_SHIFT)
#endif
#endif
#define virt_addr_valid(addr) ({ \
__typeof__(addr) __addr = addr; \
__is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr)); \
})
#define _virt_addr_is_linear(kaddr) \
(__tag_reset((u64)(kaddr)) >= PAGE_OFFSET)
#define virt_addr_valid(kaddr) \
(_virt_addr_is_linear(kaddr) && _virt_addr_valid(kaddr))
#endif /* !ASSEMBLY */
/*
* Given that the GIC architecture permits ITS implementations that can only be
@ -335,4 +346,4 @@ static inline void *phys_to_virt(phys_addr_t x)
#include <asm-generic/memory_model.h>
#endif
#endif /* __ASM_MEMORY_H */

2
arch/arm64/include/asm/mmu.h
View File

@ -126,7 +126,7 @@ extern void init_mem_pgprot(void);
extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
unsigned long virt, phys_addr_t size,
pgprot_t prot, bool page_mappings_only);
extern void *fixmap_remap_fdt(phys_addr_t dt_phys);
extern void *fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot);
extern void mark_linear_text_alias_ro(void);
#define INIT_MM_CONTEXT(name) \

4
arch/arm64/include/asm/mmu_context.h
View File

@ -63,7 +63,7 @@ extern u64 idmap_ptrs_per_pgd;
static inline bool __cpu_uses_extended_idmap(void)
{
if (IS_ENABLED(CONFIG_ARM64_USER_VA_BITS_52))
if (IS_ENABLED(CONFIG_ARM64_VA_BITS_52))
return false;
return unlikely(idmap_t0sz != TCR_T0SZ(VA_BITS));
@ -95,7 +95,7 @@ static inline void __cpu_set_tcr_t0sz(unsigned long t0sz)
isb();
}
#define cpu_set_default_tcr_t0sz() __cpu_set_tcr_t0sz(TCR_T0SZ(VA_BITS))
#define cpu_set_default_tcr_t0sz() __cpu_set_tcr_t0sz(TCR_T0SZ(vabits_actual))
#define cpu_set_idmap_tcr_t0sz() __cpu_set_tcr_t0sz(idmap_t0sz)
/*

2
arch/arm64/include/asm/pgtable-hwdef.h
View File

@ -304,7 +304,7 @@
#define TTBR_BADDR_MASK_52 (((UL(1) << 46) - 1) << 2)
#endif
#ifdef CONFIG_ARM64_USER_VA_BITS_52
#ifdef CONFIG_ARM64_VA_BITS_52
/* Must be at least 64-byte aligned to prevent corruption of the TTBR */
#define TTBR1_BADDR_4852_OFFSET (((UL(1) << (52 - PGDIR_SHIFT)) - \
(UL(1) << (48 - PGDIR_SHIFT))) * 8)

23
arch/arm64/include/asm/pgtable.h
View File

@ -21,9 +21,7 @@
* and fixed mappings
*/
#define VMALLOC_START (MODULES_END)
#define VMALLOC_END (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K)
#define vmemmap ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT))
#define VMALLOC_END (- PUD_SIZE - VMEMMAP_SIZE - SZ_64K)
#define FIRST_USER_ADDRESS 0UL
@ -35,6 +33,8 @@
#include <linux/mm_types.h>
#include <linux/sched.h>
extern struct page *vmemmap;
extern void __pte_error(const char *file, int line, unsigned long val);
extern void __pmd_error(const char *file, int line, unsigned long val);
extern void __pud_error(const char *file, int line, unsigned long val);
@ -220,8 +220,10 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
* Only if the new pte is valid and kernel, otherwise TLB maintenance
* or update_mmu_cache() have the necessary barriers.
*/
if (pte_valid_not_user(pte))
if (pte_valid_not_user(pte)) {
dsb(ishst);
isb();
}
}
extern void __sync_icache_dcache(pte_t pteval);
@ -481,8 +483,10 @@ static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
WRITE_ONCE(*pmdp, pmd);
if (pmd_valid(pmd))
if (pmd_valid(pmd)) {
dsb(ishst);
isb();
}
}
static inline void pmd_clear(pmd_t *pmdp)
@ -540,8 +544,10 @@ static inline void set_pud(pud_t *pudp, pud_t pud)
WRITE_ONCE(*pudp, pud);
if (pud_valid(pud))
if (pud_valid(pud)) {
dsb(ishst);
isb();
}
}
static inline void pud_clear(pud_t *pudp)
@ -599,6 +605,7 @@ static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
WRITE_ONCE(*pgdp, pgd);
dsb(ishst);
isb();
}
static inline void pgd_clear(pgd_t *pgdp)
@ -856,8 +863,8 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
#define update_mmu_cache_pmd(vma, address, pmd) do { } while (0)
#define kc_vaddr_to_offset(v) ((v) & ~VA_START)
#define kc_offset_to_vaddr(o) ((o) | VA_START)
#define kc_vaddr_to_offset(v) ((v) & ~PAGE_END)
#define kc_offset_to_vaddr(o) ((o) | PAGE_END)
#ifdef CONFIG_ARM64_PA_BITS_52
#define phys_to_ttbr(addr) (((addr) | ((addr) >> 46)) & TTBR_BADDR_MASK_52)

2
arch/arm64/include/asm/pointer_auth.h
View File

@ -69,7 +69,7 @@ extern int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg);
* The EL0 pointer bits used by a pointer authentication code.
* This is dependent on TBI0 being enabled, or bits 63:56 would also apply.
*/
#define ptrauth_user_pac_mask() GENMASK(54, vabits_user)
#define ptrauth_user_pac_mask() GENMASK(54, vabits_actual)
/* Only valid for EL0 TTBR0 instruction pointers */
static inline unsigned long ptrauth_strip_insn_pac(unsigned long ptr)

12
arch/arm64/include/asm/processor.h
View File

@ -41,8 +41,8 @@
* TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
*/
#define DEFAULT_MAP_WINDOW_64 (UL(1) << VA_BITS)
#define TASK_SIZE_64 (UL(1) << vabits_user)
#define DEFAULT_MAP_WINDOW_64 (UL(1) << VA_BITS_MIN)
#define TASK_SIZE_64 (UL(1) << vabits_actual)
#ifdef CONFIG_COMPAT
#if defined(CONFIG_ARM64_64K_PAGES) && defined(CONFIG_KUSER_HELPERS)
@ -303,6 +303,14 @@ extern void __init minsigstksz_setup(void);
/* PR_PAC_RESET_KEYS prctl */
#define PAC_RESET_KEYS(tsk, arg) ptrauth_prctl_reset_keys(tsk, arg)
#ifdef CONFIG_ARM64_TAGGED_ADDR_ABI
/* PR_{SET,GET}_TAGGED_ADDR_CTRL prctl */
long set_tagged_addr_ctrl(unsigned long arg);
long get_tagged_addr_ctrl(void);
#define SET_TAGGED_ADDR_CTRL(arg) set_tagged_addr_ctrl(arg)
#define GET_TAGGED_ADDR_CTRL() get_tagged_addr_ctrl()
#endif
/*
* For CONFIG_GCC_PLUGIN_STACKLEAK
*

5
arch/arm64/include/asm/ptrace.h
View File

@ -301,6 +301,11 @@ static inline unsigned long regs_return_value(struct pt_regs *regs)
return regs->regs[0];
}
static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
{
regs->regs[0] = rc;
}
/**
* regs_get_kernel_argument() - get Nth function argument in kernel
* @regs: pt_regs of that context

3
arch/arm64/include/asm/sysreg.h
View File

@ -212,6 +212,9 @@
#define SYS_FAR_EL1 sys_reg(3, 0, 6, 0, 0)
#define SYS_PAR_EL1 sys_reg(3, 0, 7, 4, 0)
#define SYS_PAR_EL1_F BIT(1)
#define SYS_PAR_EL1_FST GENMASK(6, 1)
/*** Statistical Profiling Extension ***/
/* ID registers */
#define SYS_PMSIDR_EL1 sys_reg(3, 0, 9, 9, 7)

1
arch/arm64/include/asm/thread_info.h
View File

@ -77,6 +77,7 @@ void arch_release_task_struct(struct task_struct *tsk);
#define TIF_SVE 23 /* Scalable Vector Extension in use */
#define TIF_SVE_VL_INHERIT 24 /* Inherit sve_vl_onexec across exec */
#define TIF_SSBD 25 /* Wants SSB mitigation */
#define TIF_TAGGED_ADDR 26 /* Allow tagged user addresses */
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)

1
arch/arm64/include/asm/tlbflush.h
View File

@ -251,6 +251,7 @@ static inline void __flush_tlb_kernel_pgtable(unsigned long kaddr)
dsb(ishst);
__tlbi(vaae1is, addr);
dsb(ish);
isb();
}
#endif

23
arch/arm64/include/asm/topology.h
View File

@ -4,29 +4,6 @@
#include <linux/cpumask.h>
struct cpu_topology {
int thread_id;
int core_id;
int package_id;
int llc_id;
cpumask_t thread_sibling;
cpumask_t core_sibling;
cpumask_t llc_sibling;
};
extern struct cpu_topology cpu_topology[NR_CPUS];
#define topology_physical_package_id(cpu) (cpu_topology[cpu].package_id)
#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)
#define topology_llc_cpumask(cpu) (&cpu_topology[cpu].llc_sibling)
void init_cpu_topology(void);
void store_cpu_topology(unsigned int cpuid);
void remove_cpu_topology(unsigned int cpuid);
const struct cpumask *cpu_coregroup_mask(int cpu);
#ifdef CONFIG_NUMA
struct pci_bus;

12
arch/arm64/include/asm/uaccess.h
View File

@ -62,6 +62,10 @@ static inline unsigned long __range_ok(const void __user *addr, unsigned long si
{
unsigned long ret, limit = current_thread_info()->addr_limit;
if (IS_ENABLED(CONFIG_ARM64_TAGGED_ADDR_ABI) &&
test_thread_flag(TIF_TAGGED_ADDR))
addr = untagged_addr(addr);
__chk_user_ptr(addr);
asm volatile(
// A + B <= C + 1 for all A,B,C, in four easy steps:
@ -215,7 +219,8 @@ static inline void uaccess_enable_not_uao(void)
/*
* Sanitise a uaccess pointer such that it becomes NULL if above the
* current addr_limit.
* current addr_limit. In case the pointer is tagged (has the top byte set),
* untag the pointer before checking.
*/
#define uaccess_mask_ptr(ptr) (__typeof__(ptr))__uaccess_mask_ptr(ptr)
static inline void __user *__uaccess_mask_ptr(const void __user *ptr)
@ -223,10 +228,11 @@ static inline void __user *__uaccess_mask_ptr(const void __user *ptr)
void __user *safe_ptr;
asm volatile(
" bics xzr, %1, %2\n"
" bics xzr, %3, %2\n"
" csel %0, %1, xzr, eq\n"
: "=&r" (safe_ptr)
: "r" (ptr), "r" (current_thread_info()->addr_limit)
: "r" (ptr), "r" (current_thread_info()->addr_limit),
"r" (untagged_addr(ptr))
: "cc");
csdb();

50
arch/arm64/kernel/cpuidle.c
View File

@ -11,6 +11,7 @@
#include <linux/cpu_pm.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/psci.h>
#include <asm/cpuidle.h>
#include <asm/cpu_ops.h>
@ -46,17 +47,58 @@ int arm_cpuidle_suspend(int index)
#define ARM64_LPI_IS_RETENTION_STATE(arch_flags) (!(arch_flags))
static int psci_acpi_cpu_init_idle(unsigned int cpu)
{
int i, count;
struct acpi_lpi_state *lpi;
struct acpi_processor *pr = per_cpu(processors, cpu);
/*
* If the PSCI cpu_suspend function hook has not been initialized
* idle states must not be enabled, so bail out
*/
if (!psci_ops.cpu_suspend)
return -EOPNOTSUPP;
if (unlikely(!pr || !pr->flags.has_lpi))
return -EINVAL;
count = pr->power.count - 1;
if (count <= 0)
return -ENODEV;
for (i = 0; i < count; i++) {
u32 state;
lpi = &pr->power.lpi_states[i + 1];
/*
* Only bits[31:0] represent a PSCI power_state while
* bits[63:32] must be 0x0 as per ARM ACPI FFH Specification
*/
state = lpi->address;
if (!psci_power_state_is_valid(state)) {
pr_warn("Invalid PSCI power state %#x\n", state);
return -EINVAL;
}
}
return 0;
}
int acpi_processor_ffh_lpi_probe(unsigned int cpu)
{
return arm_cpuidle_init(cpu);
return psci_acpi_cpu_init_idle(cpu);
}
int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi)
{
u32 state = lpi->address;
if (ARM64_LPI_IS_RETENTION_STATE(lpi->arch_flags))
return CPU_PM_CPU_IDLE_ENTER_RETENTION(arm_cpuidle_suspend,
lpi->index);
return CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM(psci_cpu_suspend_enter,
lpi->index, state);
else
return CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, lpi->index);
return CPU_PM_CPU_IDLE_ENTER_PARAM(psci_cpu_suspend_enter,
lpi->index, state);
}
#endif

20
arch/arm64/kernel/head.S
View File

@ -310,15 +310,15 @@ __create_page_tables:
adrp x0, idmap_pg_dir
adrp x3, __idmap_text_start // __pa(__idmap_text_start)
#ifdef CONFIG_ARM64_USER_VA_BITS_52
#ifdef CONFIG_ARM64_VA_BITS_52
mrs_s x6, SYS_ID_AA64MMFR2_EL1
and x6, x6, #(0xf << ID_AA64MMFR2_LVA_SHIFT)
mov x5, #52
cbnz x6, 1f
#endif
mov x5, #VA_BITS
mov x5, #VA_BITS_MIN
1:
adr_l x6, vabits_user
adr_l x6, vabits_actual
str x5, [x6]
dmb sy
dc ivac, x6 // Invalidate potentially stale cache line
@ -726,14 +726,22 @@ __secondary_switched:
adr_l x0, secondary_data
ldr x1, [x0, #CPU_BOOT_STACK] // get secondary_data.stack
cbz x1, __secondary_too_slow
mov sp, x1
ldr x2, [x0, #CPU_BOOT_TASK]
cbz x2, __secondary_too_slow
msr sp_el0, x2
mov x29, #0
mov x30, #0
b secondary_start_kernel
ENDPROC(__secondary_switched)
__secondary_too_slow:
wfe
wfi
b __secondary_too_slow
ENDPROC(__secondary_too_slow)
/*
* The booting CPU updates the failed status @__early_cpu_boot_status,
* with MMU turned off.
@ -774,7 +782,7 @@ ENTRY(__enable_mmu)
phys_to_ttbr x1, x1
phys_to_ttbr x2, x2
msr ttbr0_el1, x2 // load TTBR0
offset_ttbr1 x1
offset_ttbr1 x1, x3
msr ttbr1_el1, x1 // load TTBR1
isb
msr sctlr_el1, x0
@ -791,8 +799,8 @@ ENTRY(__enable_mmu)
ENDPROC(__enable_mmu)
ENTRY(__cpu_secondary_check52bitva)
#ifdef CONFIG_ARM64_USER_VA_BITS_52
ldr_l x0, vabits_user
#ifdef CONFIG_ARM64_VA_BITS_52
ldr_l x0, vabits_actual
cmp x0, #52
b.ne 2f

8
arch/arm64/kernel/hibernate-asm.S
View File

@ -22,14 +22,14 @@
* Even switching to our copied tables will cause a changed output address at
* each stage of the walk.
*/
.macro break_before_make_ttbr_switch zero_page, page_table, tmp
.macro break_before_make_ttbr_switch zero_page, page_table, tmp, tmp2
phys_to_ttbr \tmp, \zero_page
msr ttbr1_el1, \tmp
isb
tlbi vmalle1
dsb nsh
phys_to_ttbr \tmp, \page_table
offset_ttbr1 \tmp
offset_ttbr1 \tmp, \tmp2
msr ttbr1_el1, \tmp
isb
.endm
@ -70,7 +70,7 @@ ENTRY(swsusp_arch_suspend_exit)
* We execute from ttbr0, change ttbr1 to our copied linear map tables
* with a break-before-make via the zero page
*/
break_before_make_ttbr_switch x5, x0, x6
break_before_make_ttbr_switch x5, x0, x6, x8
mov x21, x1
mov x30, x2
@ -101,7 +101,7 @@ ENTRY(swsusp_arch_suspend_exit)
dsb ish /* wait for PoU cleaning to finish */
/* switch to the restored kernels page tables */
break_before_make_ttbr_switch x25, x21, x6
break_before_make_ttbr_switch x25, x21, x6, x8
ic ialluis
dsb ish

2
arch/arm64/kernel/hibernate.c
View File

@ -496,7 +496,7 @@ int swsusp_arch_resume(void)
rc = -ENOMEM;
goto out;
}
rc = copy_page_tables(tmp_pg_dir, PAGE_OFFSET, 0);
rc = copy_page_tables(tmp_pg_dir, PAGE_OFFSET, PAGE_END);
if (rc)
goto out;

11
arch/arm64/kernel/kaslr.c
View File

@ -62,9 +62,6 @@ out:
return default_cmdline;
}
extern void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size,
pgprot_t prot);
/*
* This routine will be executed with the kernel mapped at its default virtual
* address, and if it returns successfully, the kernel will be remapped, and
@ -93,7 +90,7 @@ u64 __init kaslr_early_init(u64 dt_phys)
* attempt at mapping the FDT in setup_machine()
*/
early_fixmap_init();
fdt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
fdt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
if (!fdt)
return 0;
@ -116,15 +113,15 @@ u64 __init kaslr_early_init(u64 dt_phys)
/*
* OK, so we are proceeding with KASLR enabled. Calculate a suitable
* kernel image offset from the seed. Let's place the kernel in the
* middle half of the VMALLOC area (VA_BITS - 2), and stay clear of
* middle half of the VMALLOC area (VA_BITS_MIN - 2), and stay clear of
* the lower and upper quarters to avoid colliding with other
* allocations.
* Even if we could randomize at page granularity for 16k and 64k pages,
* let's always round to 2 MB so we don't interfere with the ability to
* map using contiguous PTEs
*/
mask = ((1UL << (VA_BITS - 2)) - 1) & ~(SZ_2M - 1);
offset = BIT(VA_BITS - 3) + (seed & mask);
mask = ((1UL << (VA_BITS_MIN - 2)) - 1) & ~(SZ_2M - 1);
offset = BIT(VA_BITS_MIN - 3) + (seed & mask);
/* use the top 16 bits to randomize the linear region */
memstart_offset_seed = seed >> 48;

18
arch/arm64/kernel/machine_kexec_file.c
View File

@ -27,6 +27,8 @@
#define FDT_PROP_INITRD_END "linux,initrd-end"
#define FDT_PROP_BOOTARGS "bootargs"
#define FDT_PROP_KASLR_SEED "kaslr-seed"
#define FDT_PROP_RNG_SEED "rng-seed"
#define RNG_SEED_SIZE 128
const struct kexec_file_ops * const kexec_file_loaders[] = {
&kexec_image_ops,
@ -102,6 +104,19 @@ static int setup_dtb(struct kimage *image,
FDT_PROP_KASLR_SEED);
}
/* add rng-seed */
if (rng_is_initialized()) {
u8 rng_seed[RNG_SEED_SIZE];
get_random_bytes(rng_seed, RNG_SEED_SIZE);
ret = fdt_setprop(dtb, off, FDT_PROP_RNG_SEED, rng_seed,
RNG_SEED_SIZE);
if (ret)
goto out;
} else {
pr_notice("RNG is not initialised: omitting \"%s\" property\n",
FDT_PROP_RNG_SEED);
}
out:
if (ret)
return (ret == -FDT_ERR_NOSPACE) ? -ENOMEM : -EINVAL;
@ -110,7 +125,8 @@ out:
}
/*
* More space needed so that we can add initrd, bootargs and kaslr-seed.
* More space needed so that we can add initrd, bootargs, kaslr-seed, and
* rng-seed.
*/
#define DTB_EXTRA_SPACE 0x1000

2
arch/arm64/kernel/perf_event.c
View File

@ -19,6 +19,7 @@
#include <linux/of.h>
#include <linux/perf/arm_pmu.h>
#include <linux/platform_device.h>
#include <linux/smp.h>
/* ARMv8 Cortex-A53 specific event types. */
#define ARMV8_A53_PERFCTR_PREF_LINEFILL 0xC2
@ -157,7 +158,6 @@ armv8pmu_events_sysfs_show(struct device *dev,
return sprintf(page, "event=0x%03llx\n", pmu_attr->id);
}
#define ARMV8_EVENT_ATTR_RESOLVE(m) #m
#define ARMV8_EVENT_ATTR(name, config) \
PMU_EVENT_ATTR(name, armv8_event_attr_##name, \
config, armv8pmu_events_sysfs_show)

76
arch/arm64/kernel/process.c
View File

@ -19,6 +19,7 @@
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/sysctl.h>
#include <linux/unistd.h>
#include <linux/user.h>
#include <linux/delay.h>
@ -38,6 +39,7 @@
#include <trace/events/power.h>
#include <linux/percpu.h>
#include <linux/thread_info.h>
#include <linux/prctl.h>
#include <asm/alternative.h>
#include <asm/arch_gicv3.h>
@ -307,11 +309,18 @@ static void tls_thread_flush(void)
}
}
static void flush_tagged_addr_state(void)
{
if (IS_ENABLED(CONFIG_ARM64_TAGGED_ADDR_ABI))
clear_thread_flag(TIF_TAGGED_ADDR);
}
void flush_thread(void)
{
fpsimd_flush_thread();
tls_thread_flush();
flush_ptrace_hw_breakpoint(current);
flush_tagged_addr_state();
}
void release_thread(struct task_struct *dead_task)
@ -565,3 +574,70 @@ void arch_setup_new_exec(void)
ptrauth_thread_init_user(current);
}
#ifdef CONFIG_ARM64_TAGGED_ADDR_ABI
/*
* Control the relaxed ABI allowing tagged user addresses into the kernel.
*/
static unsigned int tagged_addr_disabled;
long set_tagged_addr_ctrl(unsigned long arg)
{
if (is_compat_task())
return -EINVAL;
if (arg & ~PR_TAGGED_ADDR_ENABLE)
return -EINVAL;
/*
* Do not allow the enabling of the tagged address ABI if globally
* disabled via sysctl abi.tagged_addr_disabled.
*/
if (arg & PR_TAGGED_ADDR_ENABLE && tagged_addr_disabled)
return -EINVAL;
update_thread_flag(TIF_TAGGED_ADDR, arg & PR_TAGGED_ADDR_ENABLE);
return 0;
}
long get_tagged_addr_ctrl(void)
{
if (is_compat_task())
return -EINVAL;
if (test_thread_flag(TIF_TAGGED_ADDR))
return PR_TAGGED_ADDR_ENABLE;
return 0;
}
/*
* Global sysctl to disable the tagged user addresses support. This control
* only prevents the tagged address ABI enabling via prctl() and does not
* disable it for tasks that already opted in to the relaxed ABI.
*/
static int zero;
static int one = 1;
static struct ctl_table tagged_addr_sysctl_table[] = {
{
.procname = "tagged_addr_disabled",
.mode = 0644,
.data = &tagged_addr_disabled,
.maxlen = sizeof(int),
.proc_handler = proc_dointvec_minmax,
.extra1 = &zero,
.extra2 = &one,
},
{ }
};
static int __init tagged_addr_init(void)
{
if (!register_sysctl("abi", tagged_addr_sysctl_table))
return -EINVAL;
return 0;
}
core_initcall(tagged_addr_init);
#endif /* CONFIG_ARM64_TAGGED_ADDR_ABI */

10
arch/arm64/kernel/psci.c
View File

@ -46,6 +46,11 @@ static int cpu_psci_cpu_boot(unsigned int cpu)
}
#ifdef CONFIG_HOTPLUG_CPU
static bool cpu_psci_cpu_can_disable(unsigned int cpu)
{
return !psci_tos_resident_on(cpu);
}
static int cpu_psci_cpu_disable(unsigned int cpu)
{
/* Fail early if we don't have CPU_OFF support */
@ -105,14 +110,11 @@ static int cpu_psci_cpu_kill(unsigned int cpu)
const struct cpu_operations cpu_psci_ops = {
.name = "psci",
#ifdef CONFIG_CPU_IDLE
.cpu_init_idle = psci_cpu_init_idle,
.cpu_suspend = psci_cpu_suspend_enter,
#endif
.cpu_init = cpu_psci_cpu_init,
.cpu_prepare = cpu_psci_cpu_prepare,
.cpu_boot = cpu_psci_cpu_boot,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_can_disable = cpu_psci_cpu_can_disable,
.cpu_disable = cpu_psci_cpu_disable,
.cpu_die = cpu_psci_cpu_die,
.cpu_kill = cpu_psci_cpu_kill,

20
arch/arm64/kernel/setup.c
View File

@ -170,9 +170,13 @@ static void __init smp_build_mpidr_hash(void)
static void __init setup_machine_fdt(phys_addr_t dt_phys)
{
void *dt_virt = fixmap_remap_fdt(dt_phys);
int size;
void *dt_virt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
const char *name;
if (dt_virt)
memblock_reserve(dt_phys, size);
if (!dt_virt || !early_init_dt_scan(dt_virt)) {
pr_crit("\n"
"Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n"
@ -184,6 +188,9 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys)
cpu_relax();
}
/* Early fixups are done, map the FDT as read-only now */
fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
name = of_flat_dt_get_machine_name();
if (!name)
return;
@ -357,6 +364,15 @@ void __init setup_arch(char **cmdline_p)
}
}
static inline bool cpu_can_disable(unsigned int cpu)
{
#ifdef CONFIG_HOTPLUG_CPU
if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_can_disable)
return cpu_ops[cpu]->cpu_can_disable(cpu);
#endif
return false;
}
static int __init topology_init(void)
{
int i;
@ -366,7 +382,7 @@ static int __init topology_init(void)
for_each_possible_cpu(i) {
struct cpu *cpu = &per_cpu(cpu_data.cpu, i);
cpu->hotpluggable = 1;
cpu->hotpluggable = cpu_can_disable(i);
register_cpu(cpu, i);
}

4
arch/arm64/kernel/smp.c
View File

@ -123,7 +123,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
* time out.
*/
wait_for_completion_timeout(&cpu_running,
msecs_to_jiffies(1000));
msecs_to_jiffies(5000));
if (!cpu_online(cpu)) {
pr_crit("CPU%u: failed to come online\n", cpu);
@ -136,6 +136,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
secondary_data.task = NULL;
secondary_data.stack = NULL;
__flush_dcache_area(&secondary_data, sizeof(secondary_data));
status = READ_ONCE(secondary_data.status);
if (ret && status) {
@ -146,6 +147,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
default:
pr_err("CPU%u: failed in unknown state : 0x%lx\n",
cpu, status);
cpus_stuck_in_kernel++;
break;
case CPU_KILL_ME:
if (!op_cpu_kill(cpu)) {

320
arch/arm64/kernel/topology.c
View File

@ -14,250 +14,13 @@
#include <linux/acpi.h>
#include <linux/arch_topology.h>
#include <linux/cacheinfo.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/percpu.h>
#include <linux/node.h>
#include <linux/nodemask.h>
#include <linux/of.h>
#include <linux/sched.h>
#include <linux/sched/topology.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
#include <asm/topology.h>
static int __init get_cpu_for_node(struct device_node *node)
{
struct device_node *cpu_node;
int cpu;
cpu_node = of_parse_phandle(node, "cpu", 0);
if (!cpu_node)
return -1;
cpu = of_cpu_node_to_id(cpu_node);
if (cpu >= 0)
topology_parse_cpu_capacity(cpu_node, cpu);
else
pr_crit("Unable to find CPU node for %pOF\n", cpu_node);
of_node_put(cpu_node);
return cpu;
}
static int __init parse_core(struct device_node *core, int package_id,
int core_id)
{
char name[10];
bool leaf = true;
int i = 0;
int cpu;
struct device_node *t;
do {
snprintf(name, sizeof(name), "thread%d", i);
t = of_get_child_by_name(core, name);
if (t) {
leaf = false;
cpu = get_cpu_for_node(t);
if (cpu >= 0) {
cpu_topology[cpu].package_id = package_id;
cpu_topology[cpu].core_id = core_id;
cpu_topology[cpu].thread_id = i;
} else {
pr_err("%pOF: Can't get CPU for thread\n",
t);
of_node_put(t);
return -EINVAL;
}
of_node_put(t);
}
i++;
} while (t);
cpu = get_cpu_for_node(core);
if (cpu >= 0) {
if (!leaf) {
pr_err("%pOF: Core has both threads and CPU\n",
core);
return -EINVAL;
}
cpu_topology[cpu].package_id = package_id;
cpu_topology[cpu].core_id = core_id;
} else if (leaf) {
pr_err("%pOF: Can't get CPU for leaf core\n", core);
return -EINVAL;
}
return 0;
}
static int __init parse_cluster(struct device_node *cluster, int depth)
{
char name[10];
bool leaf = true;
bool has_cores = false;
struct device_node *c;
static int package_id __initdata;
int core_id = 0;
int i, ret;
/*
* First check for child clusters; we currently ignore any
* information about the nesting of clusters and present the
* scheduler with a flat list of them.
*/
i = 0;
do {
snprintf(name, sizeof(name), "cluster%d", i);
c = of_get_child_by_name(cluster, name);
if (c) {
leaf = false;
ret = parse_cluster(c, depth + 1);
of_node_put(c);
if (ret != 0)
return ret;
}
i++;
} while (c);
/* Now check for cores */
i = 0;
do {
snprintf(name, sizeof(name), "core%d", i);
c = of_get_child_by_name(cluster, name);
if (c) {
has_cores = true;
if (depth == 0) {
pr_err("%pOF: cpu-map children should be clusters\n",
c);
of_node_put(c);
return -EINVAL;
}
if (leaf) {
ret = parse_core(c, package_id, core_id++);
} else {
pr_err("%pOF: Non-leaf cluster with core %s\n",
cluster, name);
ret = -EINVAL;
}
of_node_put(c);
if (ret != 0)
return ret;
}
i++;
} while (c);
if (leaf && !has_cores)
pr_warn("%pOF: empty cluster\n", cluster);
if (leaf)
package_id++;
return 0;
}
static int __init parse_dt_topology(void)
{
struct device_node *cn, *map;
int ret = 0;
int cpu;
cn = of_find_node_by_path("/cpus");
if (!cn) {
pr_err("No CPU information found in DT\n");
return 0;
}
/*
* When topology is provided cpu-map is essentially a root
* cluster with restricted subnodes.
*/
map = of_get_child_by_name(cn, "cpu-map");
if (!map)
goto out;
ret = parse_cluster(map, 0);
if (ret != 0)
goto out_map;
topology_normalize_cpu_scale();
/*
* Check that all cores are in the topology; the SMP code will
* only mark cores described in the DT as possible.
*/
for_each_possible_cpu(cpu)
if (cpu_topology[cpu].package_id == -1)
ret = -EINVAL;
out_map:
of_node_put(map);
out:
of_node_put(cn);
return ret;
}
/*
* cpu topology table
*/
struct cpu_topology cpu_topology[NR_CPUS];
EXPORT_SYMBOL_GPL(cpu_topology);
const struct cpumask *cpu_coregroup_mask(int cpu)
{
const cpumask_t *core_mask = cpumask_of_node(cpu_to_node(cpu));
/* Find the smaller of NUMA, core or LLC siblings */
if (cpumask_subset(&cpu_topology[cpu].core_sibling, core_mask)) {
/* not numa in package, lets use the package siblings */
core_mask = &cpu_topology[cpu].core_sibling;
}
if (cpu_topology[cpu].llc_id != -1) {
if (cpumask_subset(&cpu_topology[cpu].llc_sibling, core_mask))
core_mask = &cpu_topology[cpu].llc_sibling;
}
return core_mask;
}
static void update_siblings_masks(unsigned int cpuid)
{
struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
int cpu;
/* update core and thread sibling masks */
for_each_online_cpu(cpu) {
cpu_topo = &cpu_topology[cpu];
if (cpuid_topo->llc_id == cpu_topo->llc_id) {
cpumask_set_cpu(cpu, &cpuid_topo->llc_sibling);
cpumask_set_cpu(cpuid, &cpu_topo->llc_sibling);
}
if (cpuid_topo->package_id != cpu_topo->package_id)
continue;
cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
if (cpuid_topo->core_id != cpu_topo->core_id)
continue;
cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
}
}
void store_cpu_topology(unsigned int cpuid)
{
struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
@ -296,60 +59,31 @@ topology_populated:
update_siblings_masks(cpuid);
}
static void clear_cpu_topology(int cpu)
{
struct cpu_topology *cpu_topo = &cpu_topology[cpu];
cpumask_clear(&cpu_topo->llc_sibling);
cpumask_set_cpu(cpu, &cpu_topo->llc_sibling);
cpumask_clear(&cpu_topo->core_sibling);
cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
cpumask_clear(&cpu_topo->thread_sibling);
cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
}
static void __init reset_cpu_topology(void)
{
unsigned int cpu;
for_each_possible_cpu(cpu) {
struct cpu_topology *cpu_topo = &cpu_topology[cpu];
cpu_topo->thread_id = -1;
cpu_topo->core_id = 0;
cpu_topo->package_id = -1;
cpu_topo->llc_id = -1;
clear_cpu_topology(cpu);
}
}
void remove_cpu_topology(unsigned int cpu)
{
int sibling;
for_each_cpu(sibling, topology_core_cpumask(cpu))
cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
for_each_cpu(sibling, topology_sibling_cpumask(cpu))
cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
for_each_cpu(sibling, topology_llc_cpumask(cpu))
cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling));
clear_cpu_topology(cpu);
}
#ifdef CONFIG_ACPI
static bool __init acpi_cpu_is_threaded(int cpu)
{
int is_threaded = acpi_pptt_cpu_is_thread(cpu);
/*
* if the PPTT doesn't have thread information, assume a homogeneous
* machine and return the current CPU's thread state.
*/
if (is_threaded < 0)
is_threaded = read_cpuid_mpidr() & MPIDR_MT_BITMASK;
return !!is_threaded;
}
/*
* Propagate the topology information of the processor_topology_node tree to the
* cpu_topology array.
*/
static int __init parse_acpi_topology(void)
int __init parse_acpi_topology(void)
{
bool is_threaded;
int cpu, topology_id;
is_threaded = read_cpuid_mpidr() & MPIDR_MT_BITMASK;
if (acpi_disabled)
return 0;
for_each_possible_cpu(cpu) {
int i, cache_id;
@ -358,7 +92,7 @@ static int __init parse_acpi_topology(void)
if (topology_id < 0)
return topology_id;
if (is_threaded) {
if (acpi_cpu_is_threaded(cpu)) {
cpu_topology[cpu].thread_id = topology_id;
topology_id = find_acpi_cpu_topology(cpu, 1);
cpu_topology[cpu].core_id = topology_id;
@ -384,24 +118,6 @@ static int __init parse_acpi_topology(void)
return 0;
}
#else
static inline int __init parse_acpi_topology(void)
{
return -EINVAL;
}
#endif
void __init init_cpu_topology(void)
{
reset_cpu_topology();
/*
* Discard anything that was parsed if we hit an error so we
* don't use partial information.
*/
if (!acpi_disabled && parse_acpi_topology())
reset_cpu_topology();
else if (of_have_populated_dt() && parse_dt_topology())
reset_cpu_topology();
}

2
arch/arm64/kvm/hyp/switch.c
View File

@ -264,7 +264,7 @@ static bool __hyp_text __translate_far_to_hpfar(u64 far, u64 *hpfar)
tmp = read_sysreg(par_el1);
write_sysreg(par, par_el1);
if (unlikely(tmp & 1))
if (unlikely(tmp & SYS_PAR_EL1_F))
return false; /* Translation failed, back to guest */
/* Convert PAR to HPFAR format */

14
arch/arm64/kvm/va_layout.c
View File

@ -29,25 +29,25 @@ static void compute_layout(void)
int kva_msb;
/* Where is my RAM region? */
hyp_va_msb = idmap_addr & BIT(VA_BITS - 1);
hyp_va_msb ^= BIT(VA_BITS - 1);
hyp_va_msb = idmap_addr & BIT(vabits_actual - 1);
hyp_va_msb ^= BIT(vabits_actual - 1);
kva_msb = fls64((u64)phys_to_virt(memblock_start_of_DRAM()) ^
(u64)(high_memory - 1));
if (kva_msb == (VA_BITS - 1)) {
if (kva_msb == (vabits_actual - 1)) {
/*
* No space in the address, let's compute the mask so
* that it covers (VA_BITS - 1) bits, and the region
* that it covers (vabits_actual - 1) bits, and the region
* bit. The tag stays set to zero.
*/
va_mask = BIT(VA_BITS - 1) - 1;
va_mask = BIT(vabits_actual - 1) - 1;
va_mask |= hyp_va_msb;
} else {
/*
* We do have some free bits to insert a random tag.
* Hyp VAs are now created from kernel linear map VAs
* using the following formula (with V == VA_BITS):
* using the following formula (with V == vabits_actual):
*
* 63 ... V | V-1 | V-2 .. tag_lsb | tag_lsb - 1 .. 0
* ---------------------------------------------------------
@ -55,7 +55,7 @@ static void compute_layout(void)
*/
tag_lsb = kva_msb;
va_mask = GENMASK_ULL(tag_lsb - 1, 0);
tag_val = get_random_long() & GENMASK_ULL(VA_BITS - 2, tag_lsb);
tag_val = get_random_long() & GENMASK_ULL(vabits_actual - 2, tag_lsb);
tag_val |= hyp_va_msb;
tag_val >>= tag_lsb;
}

2
arch/arm64/lib/Makefile
View File

@ -33,3 +33,5 @@ UBSAN_SANITIZE_atomic_ll_sc.o := n
lib-$(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) += uaccess_flushcache.o
obj-$(CONFIG_CRC32) += crc32.o
obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o

18
arch/arm64/lib/error-inject.c Normal file
View File

@ -0,0 +1,18 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/error-injection.h>
#include <linux/kprobes.h>
void override_function_with_return(struct pt_regs *regs)
{
/*
* 'regs' represents the state on entry of a predefined function in
* the kernel/module and which is captured on a kprobe.
*
* When kprobe returns back from exception it will override the end
* of probed function and directly return to the predefined
* function's caller.
*/
instruction_pointer_set(regs, procedure_link_pointer(regs));
}
NOKPROBE_SYMBOL(override_function_with_return);

24
arch/arm64/mm/dump.c
View File

@ -25,9 +25,20 @@
#include <asm/pgtable-hwdef.h>
#include <asm/ptdump.h>
static const struct addr_marker address_markers[] = {
enum address_markers_idx {
PAGE_OFFSET_NR = 0,
PAGE_END_NR,
#ifdef CONFIG_KASAN
{ KASAN_SHADOW_START, "Kasan shadow start" },
KASAN_START_NR,
#endif
};
static struct addr_marker address_markers[] = {
{ PAGE_OFFSET, "Linear Mapping start" },
{ 0 /* PAGE_END */, "Linear Mapping end" },
#ifdef CONFIG_KASAN
{ 0 /* KASAN_SHADOW_START */, "Kasan shadow start" },
{ KASAN_SHADOW_END, "Kasan shadow end" },
#endif
{ MODULES_VADDR, "Modules start" },
@ -42,7 +53,6 @@ static const struct addr_marker address_markers[] = {
{ VMEMMAP_START, "vmemmap start" },
{ VMEMMAP_START + VMEMMAP_SIZE, "vmemmap end" },
#endif
{ PAGE_OFFSET, "Linear mapping" },
{ -1, NULL },
};
@ -376,7 +386,7 @@ static void ptdump_initialize(void)
static struct ptdump_info kernel_ptdump_info = {
.mm = &init_mm,
.markers = address_markers,
.base_addr = VA_START,
.base_addr = PAGE_OFFSET,
};
void ptdump_check_wx(void)
@ -390,7 +400,7 @@ void ptdump_check_wx(void)
.check_wx = true,
};
walk_pgd(&st, &init_mm, VA_START);
walk_pgd(&st, &init_mm, PAGE_OFFSET);
note_page(&st, 0, 0, 0);
if (st.wx_pages || st.uxn_pages)
pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found, %lu non-UXN pages found\n",
@ -401,6 +411,10 @@ void ptdump_check_wx(void)
static int ptdump_init(void)
{
address_markers[PAGE_END_NR].start_address = PAGE_END;
#ifdef CONFIG_KASAN
address_markers[KASAN_START_NR].start_address = KASAN_SHADOW_START;
#endif
ptdump_initialize();
ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables");
return 0;

40
arch/arm64/mm/fault.c
View File

@ -8,6 +8,7 @@
*/
#include <linux/acpi.h>
#include <linux/bitfield.h>
#include <linux/extable.h>
#include <linux/signal.h>
#include <linux/mm.h>
@ -109,7 +110,7 @@ static inline bool is_ttbr0_addr(unsigned long addr)
static inline bool is_ttbr1_addr(unsigned long addr)
{
/* TTBR1 addresses may have a tag if KASAN_SW_TAGS is in use */
return arch_kasan_reset_tag(addr) >= VA_START;
return arch_kasan_reset_tag(addr) >= PAGE_OFFSET;
}
/*
@ -138,10 +139,9 @@ static void show_pte(unsigned long addr)
return;
}
pr_alert("%s pgtable: %luk pages, %u-bit VAs, pgdp=%016lx\n",
pr_alert("%s pgtable: %luk pages, %llu-bit VAs, pgdp=%016lx\n",
mm == &init_mm ? "swapper" : "user", PAGE_SIZE / SZ_1K,
mm == &init_mm ? VA_BITS : (int)vabits_user,
(unsigned long)virt_to_phys(mm->pgd));
vabits_actual, (unsigned long)virt_to_phys(mm->pgd));
pgdp = pgd_offset(mm, addr);
pgd = READ_ONCE(*pgdp);
pr_alert("[%016lx] pgd=%016llx", addr, pgd_val(pgd));
@ -242,6 +242,34 @@ static inline bool is_el1_permission_fault(unsigned long addr, unsigned int esr,
return false;
}
static bool __kprobes is_spurious_el1_translation_fault(unsigned long addr,
unsigned int esr,
struct pt_regs *regs)
{
unsigned long flags;
u64 par, dfsc;
if (ESR_ELx_EC(esr) != ESR_ELx_EC_DABT_CUR ||
(esr & ESR_ELx_FSC_TYPE) != ESR_ELx_FSC_FAULT)
return false;
local_irq_save(flags);
asm volatile("at s1e1r, %0" :: "r" (addr));
isb();
par = read_sysreg(par_el1);
local_irq_restore(flags);
if (!(par & SYS_PAR_EL1_F))
return false;
/*
* If we got a different type of fault from the AT instruction,
* treat the translation fault as spurious.
*/
dfsc = FIELD_PREP(SYS_PAR_EL1_FST, par);
return (dfsc & ESR_ELx_FSC_TYPE) != ESR_ELx_FSC_FAULT;
}
static void die_kernel_fault(const char *msg, unsigned long addr,
unsigned int esr, struct pt_regs *regs)
{
@ -270,6 +298,10 @@ static void __do_kernel_fault(unsigned long addr, unsigned int esr,
if (!is_el1_instruction_abort(esr) && fixup_exception(regs))
return;
if (WARN_RATELIMIT(is_spurious_el1_translation_fault(addr, esr, regs),
"Ignoring spurious kernel translation fault at virtual address %016lx\n", addr))
return;
if (is_el1_permission_fault(addr, esr, regs)) {
if (esr & ESR_ELx_WNR)
msg = "write to read-only memory";

29
arch/arm64/mm/init.c
View File

@ -50,6 +50,12 @@
s64 memstart_addr __ro_after_init = -1;
EXPORT_SYMBOL(memstart_addr);
s64 physvirt_offset __ro_after_init;
EXPORT_SYMBOL(physvirt_offset);
struct page *vmemmap __ro_after_init;
EXPORT_SYMBOL(vmemmap);
phys_addr_t arm64_dma_phys_limit __ro_after_init;
#ifdef CONFIG_KEXEC_CORE
@ -301,7 +307,7 @@ static void __init fdt_enforce_memory_region(void)
void __init arm64_memblock_init(void)
{
const s64 linear_region_size = -(s64)PAGE_OFFSET;
const s64 linear_region_size = BIT(vabits_actual - 1);
/* Handle linux,usable-memory-range property */
fdt_enforce_memory_region();
@ -309,19 +315,26 @@ void __init arm64_memblock_init(void)
/* Remove memory above our supported physical address size */
memblock_remove(1ULL << PHYS_MASK_SHIFT, ULLONG_MAX);
/*
* Ensure that the linear region takes up exactly half of the kernel
* virtual address space. This way, we can distinguish a linear address
* from a kernel/module/vmalloc address by testing a single bit.
*/
BUILD_BUG_ON(linear_region_size != BIT(VA_BITS - 1));
/*
* Select a suitable value for the base of physical memory.
*/
memstart_addr = round_down(memblock_start_of_DRAM(),
ARM64_MEMSTART_ALIGN);
physvirt_offset = PHYS_OFFSET - PAGE_OFFSET;
vmemmap = ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT));
/*
* If we are running with a 52-bit kernel VA config on a system that
* does not support it, we have to offset our vmemmap and physvirt_offset
* s.t. we avoid the 52-bit portion of the direct linear map
*/
if (IS_ENABLED(CONFIG_ARM64_VA_BITS_52) && (vabits_actual != 52)) {
vmemmap += (_PAGE_OFFSET(48) - _PAGE_OFFSET(52)) >> PAGE_SHIFT;
physvirt_offset = PHYS_OFFSET - _PAGE_OFFSET(48);
}
/*
* Remove the memory that we will not be able to cover with the
* linear mapping. Take care not to clip the kernel which may be

9
arch/arm64/mm/kasan_init.c
View File

@ -156,7 +156,8 @@ asmlinkage void __init kasan_early_init(void)
{
BUILD_BUG_ON(KASAN_SHADOW_OFFSET !=
KASAN_SHADOW_END - (1UL << (64 - KASAN_SHADOW_SCALE_SHIFT)));
BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_START, PGDIR_SIZE));
BUILD_BUG_ON(!IS_ALIGNED(_KASAN_SHADOW_START(VA_BITS), PGDIR_SIZE));
BUILD_BUG_ON(!IS_ALIGNED(_KASAN_SHADOW_START(VA_BITS_MIN), PGDIR_SIZE));
BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE));
kasan_pgd_populate(KASAN_SHADOW_START, KASAN_SHADOW_END, NUMA_NO_NODE,
true);
@ -225,10 +226,10 @@ void __init kasan_init(void)
kasan_map_populate(kimg_shadow_start, kimg_shadow_end,
early_pfn_to_nid(virt_to_pfn(lm_alias(_text))));
kasan_populate_early_shadow((void *)KASAN_SHADOW_START,
(void *)mod_shadow_start);
kasan_populate_early_shadow(kasan_mem_to_shadow((void *)PAGE_END),
(void *)mod_shadow_start);
kasan_populate_early_shadow((void *)kimg_shadow_end,
kasan_mem_to_shadow((void *)PAGE_OFFSET));
(void *)KASAN_SHADOW_END);
if (kimg_shadow_start > mod_shadow_end)
kasan_populate_early_shadow((void *)mod_shadow_end,

32
arch/arm64/mm/mmu.c
View File

@ -40,8 +40,9 @@
u64 idmap_t0sz = TCR_T0SZ(VA_BITS);
u64 idmap_ptrs_per_pgd = PTRS_PER_PGD;
u64 vabits_user __ro_after_init;
EXPORT_SYMBOL(vabits_user);
u64 __section(".mmuoff.data.write") vabits_actual;
EXPORT_SYMBOL(vabits_actual);
u64 kimage_voffset __ro_after_init;
EXPORT_SYMBOL(kimage_voffset);
@ -398,7 +399,7 @@ static phys_addr_t pgd_pgtable_alloc(int shift)
static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt,
phys_addr_t size, pgprot_t prot)
{
if (virt < VMALLOC_START) {
if ((virt >= PAGE_END) && (virt < VMALLOC_START)) {
pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
&phys, virt);
return;
@ -425,7 +426,7 @@ void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
static void update_mapping_prot(phys_addr_t phys, unsigned long virt,
phys_addr_t size, pgprot_t prot)
{
if (virt < VMALLOC_START) {
if ((virt >= PAGE_END) && (virt < VMALLOC_START)) {
pr_warn("BUG: not updating mapping for %pa at 0x%016lx - outside kernel range\n",
&phys, virt);
return;
@ -646,6 +647,8 @@ static void __init map_kernel(pgd_t *pgdp)
set_pgd(pgd_offset_raw(pgdp, FIXADDR_START),
READ_ONCE(*pgd_offset_k(FIXADDR_START)));
} else if (CONFIG_PGTABLE_LEVELS > 3) {
pgd_t *bm_pgdp;
pud_t *bm_pudp;
/*
* The fixmap shares its top level pgd entry with the kernel
* mapping. This can really only occur when we are running
@ -653,9 +656,9 @@ static void __init map_kernel(pgd_t *pgdp)
* entry instead.
*/
BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
pud_populate(&init_mm,
pud_set_fixmap_offset(pgdp, FIXADDR_START),
lm_alias(bm_pmd));
bm_pgdp = pgd_offset_raw(pgdp, FIXADDR_START);
bm_pudp = pud_set_fixmap_offset(bm_pgdp, FIXADDR_START);
pud_populate(&init_mm, bm_pudp, lm_alias(bm_pmd));
pud_clear_fixmap();
} else {
BUG();
@ -876,7 +879,7 @@ void __set_fixmap(enum fixed_addresses idx,
}
}
void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
void *__init fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
{
const u64 dt_virt_base = __fix_to_virt(FIX_FDT);
int offset;
@ -929,19 +932,6 @@ void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
return dt_virt;
}
void *__init fixmap_remap_fdt(phys_addr_t dt_phys)
{
void *dt_virt;
int size;
dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
if (!dt_virt)
return NULL;
memblock_reserve(dt_phys, size);
return dt_virt;
}
int __init arch_ioremap_p4d_supported(void)
{
return 0;

11
arch/arm64/mm/proc.S
View File

@ -168,7 +168,7 @@ ENDPROC(cpu_do_switch_mm)
.macro __idmap_cpu_set_reserved_ttbr1, tmp1, tmp2
adrp \tmp1, empty_zero_page
phys_to_ttbr \tmp2, \tmp1
offset_ttbr1 \tmp2
offset_ttbr1 \tmp2, \tmp1
msr ttbr1_el1, \tmp2
isb
tlbi vmalle1
@ -187,7 +187,7 @@ ENTRY(idmap_cpu_replace_ttbr1)
__idmap_cpu_set_reserved_ttbr1 x1, x3
offset_ttbr1 x0
offset_ttbr1 x0, x3
msr ttbr1_el1, x0
isb
@ -371,7 +371,7 @@ __idmap_kpti_secondary:
cbnz w18, 1b
/* All done, act like nothing happened */
offset_ttbr1 swapper_ttb
offset_ttbr1 swapper_ttb, x18
msr ttbr1_el1, swapper_ttb
isb
ret
@ -447,10 +447,11 @@ ENTRY(__cpu_setup)
TCR_TBI0 | TCR_A1 | TCR_KASAN_FLAGS
tcr_clear_errata_bits x10, x9, x5
#ifdef CONFIG_ARM64_USER_VA_BITS_52
ldr_l x9, vabits_user
#ifdef CONFIG_ARM64_VA_BITS_52
ldr_l x9, vabits_actual
sub x9, xzr, x9
add x9, x9, #64
tcr_set_t1sz x10, x9
#else
ldr_l x9, idmap_t0sz
#endif

13
arch/powerpc/include/asm/error-injection.h
View File

@ -1,13 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0+ */
#ifndef _ASM_ERROR_INJECTION_H
#define _ASM_ERROR_INJECTION_H
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/ptrace.h>
#include <asm-generic/error-injection.h>
void override_function_with_return(struct pt_regs *regs);
#endif /* _ASM_ERROR_INJECTION_H */

1
arch/riscv/Kconfig
View File

@ -48,6 +48,7 @@ config RISCV
select PCI_MSI if PCI
select RISCV_TIMER
select GENERIC_IRQ_MULTI_HANDLER
select GENERIC_ARCH_TOPOLOGY if SMP
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_MMIOWB
select HAVE_EBPF_JIT if 64BIT

3
arch/riscv/kernel/smpboot.c
View File

@ -8,6 +8,7 @@
* Copyright (C) 2017 SiFive
*/
#include <linux/arch_topology.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
@ -35,6 +36,7 @@ static DECLARE_COMPLETION(cpu_running);
void __init smp_prepare_boot_cpu(void)
{
init_cpu_topology();
}
void __init smp_prepare_cpus(unsigned int max_cpus)
@ -138,6 +140,7 @@ asmlinkage void __init smp_callin(void)
trap_init();
notify_cpu_starting(smp_processor_id());
update_siblings_masks(smp_processor_id());
set_cpu_online(smp_processor_id(), 1);
/*
* Remote TLB flushes are ignored while the CPU is offline, so emit

13
arch/x86/include/asm/error-injection.h
View File

@ -1,13 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_ERROR_INJECTION_H
#define _ASM_ERROR_INJECTION_H
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/ptrace.h>
#include <asm-generic/error-injection.h>
asmlinkage void just_return_func(void);
void override_function_with_return(struct pt_regs *regs);
#endif /* _ASM_ERROR_INJECTION_H */

53
drivers/acpi/pptt.c
View File

@ -540,6 +540,44 @@ static int find_acpi_cpu_topology_tag(unsigned int cpu, int level, int flag)
return retval;
}
/**
* check_acpi_cpu_flag() - Determine if CPU node has a flag set
* @cpu: Kernel logical CPU number
* @rev: The minimum PPTT revision defining the flag
* @flag: The flag itself
*
* Check the node representing a CPU for a given flag.
*
* Return: -ENOENT if the PPTT doesn't exist, the CPU cannot be found or
* the table revision isn't new enough.
* 1, any passed flag set
* 0, flag unset
*/
static int check_acpi_cpu_flag(unsigned int cpu, int rev, u32 flag)
{
struct acpi_table_header *table;
acpi_status status;
u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
struct acpi_pptt_processor *cpu_node = NULL;
int ret = -ENOENT;
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
if (ACPI_FAILURE(status)) {
acpi_pptt_warn_missing();
return ret;
}
if (table->revision >= rev)
cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
if (cpu_node)
ret = (cpu_node->flags & flag) != 0;
acpi_put_table(table);
return ret;
}
/**
* acpi_find_last_cache_level() - Determines the number of cache levels for a PE
* @cpu: Kernel logical CPU number
@ -604,6 +642,20 @@ int cache_setup_acpi(unsigned int cpu)
return status;
}
/**
* acpi_pptt_cpu_is_thread() - Determine if CPU is a thread
* @cpu: Kernel logical CPU number
*
* Return: 1, a thread
* 0, not a thread
* -ENOENT ,if the PPTT doesn't exist, the CPU cannot be found or
* the table revision isn't new enough.
*/
int acpi_pptt_cpu_is_thread(unsigned int cpu)
{
return check_acpi_cpu_flag(cpu, 2, ACPI_PPTT_ACPI_PROCESSOR_IS_THREAD);
}
/**
* find_acpi_cpu_topology() - Determine a unique topology value for a given CPU
* @cpu: Kernel logical CPU number
@ -664,7 +716,6 @@ int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
return ret;
}
/**
* find_acpi_cpu_topology_package() - Determine a unique CPU package value
* @cpu: Kernel logical CPU number

2
drivers/base/Kconfig
View File

@ -202,7 +202,7 @@ config GENERIC_ARCH_TOPOLOGY
help
Enable support for architectures common topology code: e.g., parsing
CPU capacity information from DT, usage of such information for
appropriate scaling, sysfs interface for changing capacity values at
appropriate scaling, sysfs interface for reading capacity values at
runtime.
endmenu

298
drivers/base/arch_topology.c
View File

@ -15,6 +15,11 @@
#include <linux/string.h>
#include <linux/sched/topology.h>
#include <linux/cpuset.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/percpu.h>
#include <linux/sched.h>
#include <linux/smp.h>
DEFINE_PER_CPU(unsigned long, freq_scale) = SCHED_CAPACITY_SCALE;
@ -241,3 +246,296 @@ static void parsing_done_workfn(struct work_struct *work)
#else
core_initcall(free_raw_capacity);
#endif
#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
static int __init get_cpu_for_node(struct device_node *node)
{
struct device_node *cpu_node;
int cpu;
cpu_node = of_parse_phandle(node, "cpu", 0);
if (!cpu_node)
return -1;
cpu = of_cpu_node_to_id(cpu_node);
if (cpu >= 0)
topology_parse_cpu_capacity(cpu_node, cpu);
else
pr_crit("Unable to find CPU node for %pOF\n", cpu_node);
of_node_put(cpu_node);
return cpu;
}
static int __init parse_core(struct device_node *core, int package_id,
int core_id)
{
char name[10];
bool leaf = true;
int i = 0;
int cpu;
struct device_node *t;
do {
snprintf(name, sizeof(name), "thread%d", i);
t = of_get_child_by_name(core, name);
if (t) {
leaf = false;
cpu = get_cpu_for_node(t);
if (cpu >= 0) {
cpu_topology[cpu].package_id = package_id;
cpu_topology[cpu].core_id = core_id;
cpu_topology[cpu].thread_id = i;
} else {
pr_err("%pOF: Can't get CPU for thread\n",
t);
of_node_put(t);
return -EINVAL;
}
of_node_put(t);
}
i++;
} while (t);
cpu = get_cpu_for_node(core);
if (cpu >= 0) {
if (!leaf) {
pr_err("%pOF: Core has both threads and CPU\n",
core);
return -EINVAL;
}
cpu_topology[cpu].package_id = package_id;
cpu_topology[cpu].core_id = core_id;
} else if (leaf) {
pr_err("%pOF: Can't get CPU for leaf core\n", core);
return -EINVAL;
}
return 0;
}
static int __init parse_cluster(struct device_node *cluster, int depth)
{
char name[10];
bool leaf = true;
bool has_cores = false;
struct device_node *c;
static int package_id __initdata;
int core_id = 0;
int i, ret;
/*
* First check for child clusters; we currently ignore any
* information about the nesting of clusters and present the
* scheduler with a flat list of them.
*/
i = 0;
do {
snprintf(name, sizeof(name), "cluster%d", i);
c = of_get_child_by_name(cluster, name);
if (c) {
leaf = false;
ret = parse_cluster(c, depth + 1);
of_node_put(c);
if (ret != 0)
return ret;
}
i++;
} while (c);
/* Now check for cores */
i = 0;
do {
snprintf(name, sizeof(name), "core%d", i);
c = of_get_child_by_name(cluster, name);
if (c) {
has_cores = true;
if (depth == 0) {
pr_err("%pOF: cpu-map children should be clusters\n",
c);
of_node_put(c);
return -EINVAL;
}
if (leaf) {
ret = parse_core(c, package_id, core_id++);
} else {
pr_err("%pOF: Non-leaf cluster with core %s\n",
cluster, name);
ret = -EINVAL;
}
of_node_put(c);
if (ret != 0)
return ret;
}
i++;
} while (c);
if (leaf && !has_cores)
pr_warn("%pOF: empty cluster\n", cluster);
if (leaf)
package_id++;
return 0;
}
static int __init parse_dt_topology(void)
{
struct device_node *cn, *map;
int ret = 0;
int cpu;
cn = of_find_node_by_path("/cpus");
if (!cn) {
pr_err("No CPU information found in DT\n");
return 0;
}
/*
* When topology is provided cpu-map is essentially a root
* cluster with restricted subnodes.
*/
map = of_get_child_by_name(cn, "cpu-map");
if (!map)
goto out;
ret = parse_cluster(map, 0);
if (ret != 0)
goto out_map;
topology_normalize_cpu_scale();
/*
* Check that all cores are in the topology; the SMP code will
* only mark cores described in the DT as possible.
*/
for_each_possible_cpu(cpu)
if (cpu_topology[cpu].package_id == -1)
ret = -EINVAL;
out_map:
of_node_put(map);
out:
of_node_put(cn);
return ret;
}
#endif
/*
* cpu topology table
*/
struct cpu_topology cpu_topology[NR_CPUS];
EXPORT_SYMBOL_GPL(cpu_topology);
const struct cpumask *cpu_coregroup_mask(int cpu)
{
const cpumask_t *core_mask = cpumask_of_node(cpu_to_node(cpu));
/* Find the smaller of NUMA, core or LLC siblings */
if (cpumask_subset(&cpu_topology[cpu].core_sibling, core_mask)) {
/* not numa in package, lets use the package siblings */
core_mask = &cpu_topology[cpu].core_sibling;
}
if (cpu_topology[cpu].llc_id != -1) {
if (cpumask_subset(&cpu_topology[cpu].llc_sibling, core_mask))
core_mask = &cpu_topology[cpu].llc_sibling;
}
return core_mask;
}
void update_siblings_masks(unsigned int cpuid)
{
struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
int cpu;
/* update core and thread sibling masks */
for_each_online_cpu(cpu) {
cpu_topo = &cpu_topology[cpu];
if (cpuid_topo->llc_id == cpu_topo->llc_id) {
cpumask_set_cpu(cpu, &cpuid_topo->llc_sibling);
cpumask_set_cpu(cpuid, &cpu_topo->llc_sibling);
}
if (cpuid_topo->package_id != cpu_topo->package_id)
continue;
cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
if (cpuid_topo->core_id != cpu_topo->core_id)
continue;
cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
}
}
static void clear_cpu_topology(int cpu)
{
struct cpu_topology *cpu_topo = &cpu_topology[cpu];
cpumask_clear(&cpu_topo->llc_sibling);
cpumask_set_cpu(cpu, &cpu_topo->llc_sibling);
cpumask_clear(&cpu_topo->core_sibling);
cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
cpumask_clear(&cpu_topo->thread_sibling);
cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
}
void __init reset_cpu_topology(void)
{
unsigned int cpu;
for_each_possible_cpu(cpu) {
struct cpu_topology *cpu_topo = &cpu_topology[cpu];
cpu_topo->thread_id = -1;
cpu_topo->core_id = -1;
cpu_topo->package_id = -1;
cpu_topo->llc_id = -1;
clear_cpu_topology(cpu);
}
}
void remove_cpu_topology(unsigned int cpu)
{
int sibling;
for_each_cpu(sibling, topology_core_cpumask(cpu))
cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
for_each_cpu(sibling, topology_sibling_cpumask(cpu))
cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
for_each_cpu(sibling, topology_llc_cpumask(cpu))
cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling));
clear_cpu_topology(cpu);
}
__weak int __init parse_acpi_topology(void)
{
return 0;
}
#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
void __init init_cpu_topology(void)
{
reset_cpu_topology();
/*
* Discard anything that was parsed if we hit an error so we
* don't use partial information.
*/
if (parse_acpi_topology())
reset_cpu_topology();
else if (of_have_populated_dt() && parse_dt_topology())
reset_cpu_topology();
}
#endif

9
drivers/char/Kconfig
View File

@ -573,3 +573,12 @@ config RANDOM_TRUST_CPU
has not installed a hidden back door to compromise the CPU's
random number generation facilities. This can also be configured
at boot with "random.trust_cpu=on/off".
config RANDOM_TRUST_BOOTLOADER
bool "Trust the bootloader to initialize Linux's CRNG"
help
Some bootloaders can provide entropy to increase the kernel's initial
device randomness. Say Y here to assume the entropy provided by the
booloader is trustworthy so it will be added to the kernel's entropy
pool. Otherwise, say N here so it will be regarded as device input that
only mixes the entropy pool.

14
drivers/char/random.c
View File

@ -2445,3 +2445,17 @@ void add_hwgenerator_randomness(const char *buffer, size_t count,
credit_entropy_bits(poolp, entropy);
}
EXPORT_SYMBOL_GPL(add_hwgenerator_randomness);
/* Handle random seed passed by bootloader.
* If the seed is trustworthy, it would be regarded as hardware RNGs. Otherwise
* it would be regarded as device data.
* The decision is controlled by CONFIG_RANDOM_TRUST_BOOTLOADER.
*/
void add_bootloader_randomness(const void *buf, unsigned int size)
{
if (IS_ENABLED(CONFIG_RANDOM_TRUST_BOOTLOADER))
add_hwgenerator_randomness(buf, size, size * 8);
else
add_device_randomness(buf, size);
}
EXPORT_SYMBOL_GPL(add_bootloader_randomness);

10
drivers/cpuidle/Kconfig.arm
View File

@ -13,6 +13,16 @@ config ARM_CPUIDLE
initialized by calling the CPU operations init idle hook
provided by architecture code.
config ARM_PSCI_CPUIDLE
bool "PSCI CPU idle Driver"
depends on ARM_PSCI_FW
select DT_IDLE_STATES
select CPU_IDLE_MULTIPLE_DRIVERS
help
Select this to enable PSCI firmware based CPUidle driver for ARM.
It provides an idle driver that is capable of detecting and
managing idle states through the PSCI firmware interface.
config ARM_BIG_LITTLE_CPUIDLE
bool "Support for ARM big.LITTLE processors"
depends on ARCH_VEXPRESS_TC2_PM || ARCH_EXYNOS

1
drivers/cpuidle/Makefile
View File

@ -20,6 +20,7 @@ obj-$(CONFIG_ARM_U8500_CPUIDLE) += cpuidle-ux500.o
obj-$(CONFIG_ARM_AT91_CPUIDLE) += cpuidle-at91.o
obj-$(CONFIG_ARM_EXYNOS_CPUIDLE) += cpuidle-exynos.o
obj-$(CONFIG_ARM_CPUIDLE) += cpuidle-arm.o
obj-$(CONFIG_ARM_PSCI_CPUIDLE) += cpuidle-psci.o
###############################################################################
# MIPS drivers

13
drivers/cpuidle/cpuidle-arm.c
View File

@ -15,7 +15,6 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/topology.h>
#include <asm/cpuidle.h>
@ -106,11 +105,17 @@ static int __init arm_idle_init_cpu(int cpu)
ret = arm_cpuidle_init(cpu);
/*
* Allow the initialization to continue for other CPUs, if the reported
* failure is a HW misconfiguration/breakage (-ENXIO).
* Allow the initialization to continue for other CPUs, if the
* reported failure is a HW misconfiguration/breakage (-ENXIO).
*
* Some platforms do not support idle operations
* (arm_cpuidle_init() returning -EOPNOTSUPP), we should
* not flag this case as an error, it is a valid
* configuration.
*/
if (ret) {
pr_err("CPU %d failed to init idle CPU ops\n", cpu);
if (ret != -EOPNOTSUPP)
pr_err("CPU %d failed to init idle CPU ops\n", cpu);
ret = ret == -ENXIO ? 0 : ret;
goto out_kfree_drv;
}

236
drivers/cpuidle/cpuidle-psci.c Normal file
View File

@ -0,0 +1,236 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* PSCI CPU idle driver.
*
* Copyright (C) 2019 ARM Ltd.
* Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
*/
#define pr_fmt(fmt) "CPUidle PSCI: " fmt
#include <linux/cpuidle.h>
#include <linux/cpumask.h>
#include <linux/cpu_pm.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/psci.h>
#include <linux/slab.h>
#include <asm/cpuidle.h>
#include "dt_idle_states.h"
static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state);
static int psci_enter_idle_state(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int idx)
{
u32 *state = __this_cpu_read(psci_power_state);
return CPU_PM_CPU_IDLE_ENTER_PARAM(psci_cpu_suspend_enter,
idx, state[idx - 1]);
}
static struct cpuidle_driver psci_idle_driver __initdata = {
.name = "psci_idle",
.owner = THIS_MODULE,
/*
* PSCI idle states relies on architectural WFI to
* be represented as state index 0.
*/
.states[0] = {
.enter = psci_enter_idle_state,
.exit_latency = 1,
.target_residency = 1,
.power_usage = UINT_MAX,
.name = "WFI",
.desc = "ARM WFI",
}
};
static const struct of_device_id psci_idle_state_match[] __initconst = {
{ .compatible = "arm,idle-state",
.data = psci_enter_idle_state },
{ },
};
static int __init psci_dt_parse_state_node(struct device_node *np, u32 *state)
{
int err = of_property_read_u32(np, "arm,psci-suspend-param", state);
if (err) {
pr_warn("%pOF missing arm,psci-suspend-param property\n", np);
return err;
}
if (!psci_power_state_is_valid(*state)) {
pr_warn("Invalid PSCI power state %#x\n", *state);
return -EINVAL;
}
return 0;
}
static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu)
{
int i, ret = 0, count = 0;
u32 *psci_states;
struct device_node *state_node;
/* Count idle states */
while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states",
count))) {
count++;
of_node_put(state_node);
}
if (!count)
return -ENODEV;
psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL);
if (!psci_states)
return -ENOMEM;
for (i = 0; i < count; i++) {
state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i);
ret = psci_dt_parse_state_node(state_node, &psci_states[i]);
of_node_put(state_node);
if (ret)
goto free_mem;
pr_debug("psci-power-state %#x index %d\n", psci_states[i], i);
}
/* Idle states parsed correctly, initialize per-cpu pointer */
per_cpu(psci_power_state, cpu) = psci_states;
return 0;
free_mem:
kfree(psci_states);
return ret;
}
static __init int psci_cpu_init_idle(unsigned int cpu)
{
struct device_node *cpu_node;
int ret;
/*
* If the PSCI cpu_suspend function hook has not been initialized
* idle states must not be enabled, so bail out
*/
if (!psci_ops.cpu_suspend)
return -EOPNOTSUPP;
cpu_node = of_cpu_device_node_get(cpu);
if (!cpu_node)
return -ENODEV;
ret = psci_dt_cpu_init_idle(cpu_node, cpu);
of_node_put(cpu_node);
return ret;
}
static int __init psci_idle_init_cpu(int cpu)
{
struct cpuidle_driver *drv;
struct device_node *cpu_node;
const char *enable_method;
int ret = 0;
cpu_node = of_cpu_device_node_get(cpu);
if (!cpu_node)
return -ENODEV;
/*
* Check whether the enable-method for the cpu is PSCI, fail
* if it is not.
*/
enable_method = of_get_property(cpu_node, "enable-method", NULL);
if (!enable_method || (strcmp(enable_method, "psci")))
ret = -ENODEV;
of_node_put(cpu_node);
if (ret)
return ret;
drv = kmemdup(&psci_idle_driver, sizeof(*drv), GFP_KERNEL);
if (!drv)
return -ENOMEM;
drv->cpumask = (struct cpumask *)cpumask_of(cpu);
/*
* Initialize idle states data, starting at index 1, since
* by default idle state 0 is the quiescent state reached
* by the cpu by executing the wfi instruction.
*
* If no DT idle states are detected (ret == 0) let the driver
* initialization fail accordingly since there is no reason to
* initialize the idle driver if only wfi is supported, the
* default archictectural back-end already executes wfi
* on idle entry.
*/
ret = dt_init_idle_driver(drv, psci_idle_state_match, 1);
if (ret <= 0) {
ret = ret ? : -ENODEV;
goto out_kfree_drv;
}
/*
* Initialize PSCI idle states.
*/
ret = psci_cpu_init_idle(cpu);
if (ret) {
pr_err("CPU %d failed to PSCI idle\n", cpu);
goto out_kfree_drv;
}
ret = cpuidle_register(drv, NULL);
if (ret)
goto out_kfree_drv;
return 0;
out_kfree_drv:
kfree(drv);
return ret;
}
/*
* psci_idle_init - Initializes PSCI cpuidle driver
*
* Initializes PSCI cpuidle driver for all CPUs, if any CPU fails
* to register cpuidle driver then rollback to cancel all CPUs
* registration.
*/
static int __init psci_idle_init(void)
{
int cpu, ret;
struct cpuidle_driver *drv;
struct cpuidle_device *dev;
for_each_possible_cpu(cpu) {
ret = psci_idle_init_cpu(cpu);
if (ret)
goto out_fail;
}
return 0;
out_fail:
while (--cpu >= 0) {
dev = per_cpu(cpuidle_devices, cpu);
drv = cpuidle_get_cpu_driver(dev);
cpuidle_unregister(drv);
kfree(drv);
}
return ret;
}
device_initcall(psci_idle_init);

167
drivers/firmware/psci/psci.c
View File

@ -103,7 +103,7 @@ static inline bool psci_power_state_loses_context(u32 state)
return state & mask;
}
static inline bool psci_power_state_is_valid(u32 state)
bool psci_power_state_is_valid(u32 state)
{
const u32 valid_mask = psci_has_ext_power_state() ?
PSCI_1_0_EXT_POWER_STATE_MASK :
@ -277,175 +277,24 @@ static int __init psci_features(u32 psci_func_id)
}
#ifdef CONFIG_CPU_IDLE
static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state);
static int psci_dt_parse_state_node(struct device_node *np, u32 *state)
static int psci_suspend_finisher(unsigned long state)
{
int err = of_property_read_u32(np, "arm,psci-suspend-param", state);
u32 power_state = state;
if (err) {
pr_warn("%pOF missing arm,psci-suspend-param property\n", np);
return err;
}
if (!psci_power_state_is_valid(*state)) {
pr_warn("Invalid PSCI power state %#x\n", *state);
return -EINVAL;
}
return 0;
return psci_ops.cpu_suspend(power_state, __pa_symbol(cpu_resume));
}
static int psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu)
int psci_cpu_suspend_enter(u32 state)
{
int i, ret = 0, count = 0;
u32 *psci_states;
struct device_node *state_node;
/* Count idle states */
while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states",
count))) {
count++;
of_node_put(state_node);
}
if (!count)
return -ENODEV;
psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL);
if (!psci_states)
return -ENOMEM;
for (i = 0; i < count; i++) {
state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i);
ret = psci_dt_parse_state_node(state_node, &psci_states[i]);
of_node_put(state_node);
if (ret)
goto free_mem;
pr_debug("psci-power-state %#x index %d\n", psci_states[i], i);
}
/* Idle states parsed correctly, initialize per-cpu pointer */
per_cpu(psci_power_state, cpu) = psci_states;
return 0;
free_mem:
kfree(psci_states);
return ret;
}
#ifdef CONFIG_ACPI
#include <acpi/processor.h>
static int __maybe_unused psci_acpi_cpu_init_idle(unsigned int cpu)
{
int i, count;
u32 *psci_states;
struct acpi_lpi_state *lpi;
struct acpi_processor *pr = per_cpu(processors, cpu);
if (unlikely(!pr || !pr->flags.has_lpi))
return -EINVAL;
count = pr->power.count - 1;
if (count <= 0)
return -ENODEV;
psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL);
if (!psci_states)
return -ENOMEM;
for (i = 0; i < count; i++) {
u32 state;
lpi = &pr->power.lpi_states[i + 1];
/*
* Only bits[31:0] represent a PSCI power_state while
* bits[63:32] must be 0x0 as per ARM ACPI FFH Specification
*/
state = lpi->address;
if (!psci_power_state_is_valid(state)) {
pr_warn("Invalid PSCI power state %#x\n", state);
kfree(psci_states);
return -EINVAL;
}
psci_states[i] = state;
}
/* Idle states parsed correctly, initialize per-cpu pointer */
per_cpu(psci_power_state, cpu) = psci_states;
return 0;
}
#else
static int __maybe_unused psci_acpi_cpu_init_idle(unsigned int cpu)
{
return -EINVAL;
}
#endif
int psci_cpu_init_idle(unsigned int cpu)
{
struct device_node *cpu_node;
int ret;
/*
* If the PSCI cpu_suspend function hook has not been initialized
* idle states must not be enabled, so bail out
*/
if (!psci_ops.cpu_suspend)
return -EOPNOTSUPP;
if (!acpi_disabled)
return psci_acpi_cpu_init_idle(cpu);
cpu_node = of_get_cpu_node(cpu, NULL);
if (!cpu_node)
return -ENODEV;
ret = psci_dt_cpu_init_idle(cpu_node, cpu);
of_node_put(cpu_node);
return ret;
}
static int psci_suspend_finisher(unsigned long index)
{
u32 *state = __this_cpu_read(psci_power_state);
return psci_ops.cpu_suspend(state[index - 1],
__pa_symbol(cpu_resume));
}
int psci_cpu_suspend_enter(unsigned long index)
{
int ret;
u32 *state = __this_cpu_read(psci_power_state);
/*
* idle state index 0 corresponds to wfi, should never be called
* from the cpu_suspend operations
*/
if (WARN_ON_ONCE(!index))
return -EINVAL;
if (!psci_power_state_loses_context(state[index - 1]))
ret = psci_ops.cpu_suspend(state[index - 1], 0);
if (!psci_power_state_loses_context(state))
ret = psci_ops.cpu_suspend(state, 0);
else
ret = cpu_suspend(index, psci_suspend_finisher);
ret = cpu_suspend(state, psci_suspend_finisher);
return ret;
}
/* ARM specific CPU idle operations */
#ifdef CONFIG_ARM
static const struct cpuidle_ops psci_cpuidle_ops __initconst = {
.suspend = psci_cpu_suspend_enter,
.init = psci_dt_cpu_init_idle,
};
CPUIDLE_METHOD_OF_DECLARE(psci, "psci", &psci_cpuidle_ops);
#endif
#endif
static int psci_system_suspend(unsigned long unused)

16
drivers/firmware/psci/psci_checker.c
View File

@ -228,8 +228,11 @@ out_free_cpus:
static void dummy_callback(struct timer_list *unused) {}
static int suspend_cpu(int index, bool broadcast)
static int suspend_cpu(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
struct cpuidle_state *state = &drv->states[index];
bool broadcast = state->flags & CPUIDLE_FLAG_TIMER_STOP;
int ret;
arch_cpu_idle_enter();
@ -254,11 +257,7 @@ static int suspend_cpu(int index, bool broadcast)
}
}
/*
* Replicate the common ARM cpuidle enter function
* (arm_enter_idle_state).
*/
ret = CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, index);
ret = state->enter(dev, drv, index);
if (broadcast)
tick_broadcast_exit();
@ -301,9 +300,8 @@ static int suspend_test_thread(void *arg)
* doesn't use PSCI).
*/
for (index = 1; index < drv->state_count; ++index) {
struct cpuidle_state *state = &drv->states[index];
bool broadcast = state->flags & CPUIDLE_FLAG_TIMER_STOP;
int ret;
struct cpuidle_state *state = &drv->states[index];
/*
* Set the timer to wake this CPU up in some time (which
@ -318,7 +316,7 @@ static int suspend_test_thread(void *arg)
/* IRQs must be disabled during suspend operations. */
local_irq_disable();
ret = suspend_cpu(index, broadcast);
ret = suspend_cpu(dev, drv, index);
/*
* We have woken up. Re-enable IRQs to handle any

14
drivers/of/fdt.c
View File

@ -24,6 +24,7 @@
#include <linux/debugfs.h>
#include <linux/serial_core.h>
#include <linux/sysfs.h>
#include <linux/random.h>
#include <asm/setup.h> /* for COMMAND_LINE_SIZE */
#include <asm/page.h>
@ -1044,6 +1045,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
{
int l;
const char *p;
const void *rng_seed;
pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
@ -1078,6 +1080,18 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
pr_debug("Command line is: %s\n", (char*)data);
rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l);
if (rng_seed && l > 0) {
add_bootloader_randomness(rng_seed, l);
/* try to clear seed so it won't be found. */
fdt_nop_property(initial_boot_params, node, "rng-seed");
/* update CRC check value */
of_fdt_crc32 = crc32_be(~0, initial_boot_params,
fdt_totalsize(initial_boot_params));
}
/* break now */
return 1;
}

65
drivers/perf/arm_smmuv3_pmu.c
View File

@ -113,8 +113,6 @@ struct smmu_pmu {
u64 counter_mask;
u32 options;
bool global_filter;
u32 global_filter_span;
u32 global_filter_sid;
};
#define to_smmu_pmu(p) (container_of(p, struct smmu_pmu, pmu))
@ -260,6 +258,19 @@ static void smmu_pmu_set_event_filter(struct perf_event *event,
smmu_pmu_set_smr(smmu_pmu, idx, sid);
}
static bool smmu_pmu_check_global_filter(struct perf_event *curr,
struct perf_event *new)
{
if (get_filter_enable(new) != get_filter_enable(curr))
return false;
if (!get_filter_enable(new))
return true;
return get_filter_span(new) == get_filter_span(curr) &&
get_filter_stream_id(new) == get_filter_stream_id(curr);
}
static int smmu_pmu_apply_event_filter(struct smmu_pmu *smmu_pmu,
struct perf_event *event, int idx)
{
@ -279,17 +290,14 @@ static int smmu_pmu_apply_event_filter(struct smmu_pmu *smmu_pmu,
}
/* Requested settings same as current global settings*/
if (span == smmu_pmu->global_filter_span &&
sid == smmu_pmu->global_filter_sid)
idx = find_first_bit(smmu_pmu->used_counters, num_ctrs);
if (idx == num_ctrs ||
smmu_pmu_check_global_filter(smmu_pmu->events[idx], event)) {
smmu_pmu_set_event_filter(event, 0, span, sid);
return 0;
}
if (!bitmap_empty(smmu_pmu->used_counters, num_ctrs))
return -EAGAIN;
smmu_pmu_set_event_filter(event, 0, span, sid);
smmu_pmu->global_filter_span = span;
smmu_pmu->global_filter_sid = sid;
return 0;
return -EAGAIN;
}
static int smmu_pmu_get_event_idx(struct smmu_pmu *smmu_pmu,
@ -312,6 +320,19 @@ static int smmu_pmu_get_event_idx(struct smmu_pmu *smmu_pmu,
return idx;
}
static bool smmu_pmu_events_compatible(struct perf_event *curr,
struct perf_event *new)
{
if (new->pmu != curr->pmu)
return false;
if (to_smmu_pmu(new->pmu)->global_filter &&
!smmu_pmu_check_global_filter(curr, new))
return false;
return true;
}
/*
* Implementation of abstract pmu functionality required by
* the core perf events code.
@ -323,6 +344,7 @@ static int smmu_pmu_event_init(struct perf_event *event)
struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu);
struct device *dev = smmu_pmu->dev;
struct perf_event *sibling;
int group_num_events = 1;
u16 event_id;
if (event->attr.type != event->pmu->type)
@ -347,18 +369,23 @@ static int smmu_pmu_event_init(struct perf_event *event)
}
/* Don't allow groups with mixed PMUs, except for s/w events */
if (event->group_leader->pmu != event->pmu &&
!is_software_event(event->group_leader)) {
dev_dbg(dev, "Can't create mixed PMU group\n");
return -EINVAL;
if (!is_software_event(event->group_leader)) {
if (!smmu_pmu_events_compatible(event->group_leader, event))
return -EINVAL;
if (++group_num_events > smmu_pmu->num_counters)
return -EINVAL;
}
for_each_sibling_event(sibling, event->group_leader) {
if (sibling->pmu != event->pmu &&
!is_software_event(sibling)) {
dev_dbg(dev, "Can't create mixed PMU group\n");
if (is_software_event(sibling))
continue;
if (!smmu_pmu_events_compatible(sibling, event))
return -EINVAL;
if (++group_num_events > smmu_pmu->num_counters)
return -EINVAL;
}
}
hwc->idx = -1;

75
drivers/perf/fsl_imx8_ddr_perf.c
View File

@ -35,6 +35,8 @@
#define EVENT_CYCLES_COUNTER 0
#define NUM_COUNTERS 4
#define AXI_MASKING_REVERT 0xffff0000 /* AXI_MASKING(MSB 16bits) + AXI_ID(LSB 16bits) */
#define to_ddr_pmu(p) container_of(p, struct ddr_pmu, pmu)
#define DDR_PERF_DEV_NAME "imx8_ddr"
@ -42,11 +44,25 @@
static DEFINE_IDA(ddr_ida);
/* DDR Perf hardware feature */
#define DDR_CAP_AXI_ID_FILTER 0x1 /* support AXI ID filter */
struct fsl_ddr_devtype_data {
unsigned int quirks; /* quirks needed for different DDR Perf core */
};
static const struct fsl_ddr_devtype_data imx8_devtype_data;
static const struct fsl_ddr_devtype_data imx8m_devtype_data = {
.quirks = DDR_CAP_AXI_ID_FILTER,
};
static const struct of_device_id imx_ddr_pmu_dt_ids[] = {
{ .compatible = "fsl,imx8-ddr-pmu",},
{ .compatible = "fsl,imx8m-ddr-pmu",},
{ .compatible = "fsl,imx8-ddr-pmu", .data = &imx8_devtype_data},
{ .compatible = "fsl,imx8m-ddr-pmu", .data = &imx8m_devtype_data},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_ddr_pmu_dt_ids);
struct ddr_pmu {
struct pmu pmu;
@ -57,6 +73,7 @@ struct ddr_pmu {
struct perf_event *events[NUM_COUNTERS];
int active_events;
enum cpuhp_state cpuhp_state;
const struct fsl_ddr_devtype_data *devtype_data;
int irq;
int id;
};
@ -128,6 +145,8 @@ static struct attribute *ddr_perf_events_attrs[] = {
IMX8_DDR_PMU_EVENT_ATTR(refresh, 0x37),
IMX8_DDR_PMU_EVENT_ATTR(write, 0x38),
IMX8_DDR_PMU_EVENT_ATTR(raw-hazard, 0x39),
IMX8_DDR_PMU_EVENT_ATTR(axid-read, 0x41),
IMX8_DDR_PMU_EVENT_ATTR(axid-write, 0x42),
NULL,
};
@ -137,9 +156,13 @@ static struct attribute_group ddr_perf_events_attr_group = {
};
PMU_FORMAT_ATTR(event, "config:0-7");
PMU_FORMAT_ATTR(axi_id, "config1:0-15");
PMU_FORMAT_ATTR(axi_mask, "config1:16-31");
static struct attribute *ddr_perf_format_attrs[] = {
&format_attr_event.attr,
&format_attr_axi_id.attr,
&format_attr_axi_mask.attr,
NULL,
};
@ -189,6 +212,26 @@ static u32 ddr_perf_read_counter(struct ddr_pmu *pmu, int counter)
return readl_relaxed(pmu->base + COUNTER_READ + counter * 4);
}
static bool ddr_perf_is_filtered(struct perf_event *event)
{
return event->attr.config == 0x41 || event->attr.config == 0x42;
}
static u32 ddr_perf_filter_val(struct perf_event *event)
{
return event->attr.config1;
}
static bool ddr_perf_filters_compatible(struct perf_event *a,
struct perf_event *b)
{
if (!ddr_perf_is_filtered(a))
return true;
if (!ddr_perf_is_filtered(b))
return true;
return ddr_perf_filter_val(a) == ddr_perf_filter_val(b);
}
static int ddr_perf_event_init(struct perf_event *event)
{
struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
@ -215,6 +258,15 @@ static int ddr_perf_event_init(struct perf_event *event)
!is_software_event(event->group_leader))
return -EINVAL;
if (pmu->devtype_data->quirks & DDR_CAP_AXI_ID_FILTER) {
if (!ddr_perf_filters_compatible(event, event->group_leader))
return -EINVAL;
for_each_sibling_event(sibling, event->group_leader) {
if (!ddr_perf_filters_compatible(event, sibling))
return -EINVAL;
}
}
for_each_sibling_event(sibling, event->group_leader) {
if (sibling->pmu != event->pmu &&
!is_software_event(sibling))
@ -287,6 +339,23 @@ static int ddr_perf_event_add(struct perf_event *event, int flags)
struct hw_perf_event *hwc = &event->hw;
int counter;
int cfg = event->attr.config;
int cfg1 = event->attr.config1;
if (pmu->devtype_data->quirks & DDR_CAP_AXI_ID_FILTER) {
int i;
for (i = 1; i < NUM_COUNTERS; i++) {
if (pmu->events[i] &&
!ddr_perf_filters_compatible(event, pmu->events[i]))
return -EINVAL;
}
if (ddr_perf_is_filtered(event)) {
/* revert axi id masking(axi_mask) value */
cfg1 ^= AXI_MASKING_REVERT;
writel(cfg1, pmu->base + COUNTER_DPCR1);
}
}
counter = ddr_perf_alloc_counter(pmu, cfg);
if (counter < 0) {
@ -472,6 +541,8 @@ static int ddr_perf_probe(struct platform_device *pdev)
if (!name)
return -ENOMEM;
pmu->devtype_data = of_device_get_match_data(&pdev->dev);
pmu->cpu = raw_smp_processor_id();
ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
DDR_CPUHP_CB_NAME,

4
drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c
View File

@ -217,10 +217,8 @@ static int hisi_ddrc_pmu_init_irq(struct hisi_pmu *ddrc_pmu,
/* Read and init IRQ */
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "DDRC PMU get irq fail; irq:%d\n", irq);
if (irq < 0)
return irq;
}
ret = devm_request_irq(&pdev->dev, irq, hisi_ddrc_pmu_isr,
IRQF_NOBALANCING | IRQF_NO_THREAD,

4
drivers/perf/hisilicon/hisi_uncore_hha_pmu.c
View File

@ -207,10 +207,8 @@ static int hisi_hha_pmu_init_irq(struct hisi_pmu *hha_pmu,
/* Read and init IRQ */
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "HHA PMU get irq fail; irq:%d\n", irq);
if (irq < 0)
return irq;
}
ret = devm_request_irq(&pdev->dev, irq, hisi_hha_pmu_isr,
IRQF_NOBALANCING | IRQF_NO_THREAD,

4
drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c
View File

@ -206,10 +206,8 @@ static int hisi_l3c_pmu_init_irq(struct hisi_pmu *l3c_pmu,
/* Read and init IRQ */
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "L3C PMU get irq fail; irq:%d\n", irq);
if (irq < 0)
return irq;
}
ret = devm_request_irq(&pdev->dev, irq, hisi_l3c_pmu_isr,
IRQF_NOBALANCING | IRQF_NO_THREAD,

6
drivers/perf/qcom_l2_pmu.c
View File

@ -909,12 +909,8 @@ static int l2_cache_pmu_probe_cluster(struct device *dev, void *data)
cluster->cluster_id = fw_cluster_id;
irq = platform_get_irq(sdev, 0);
if (irq < 0) {
dev_err(&pdev->dev,
"Failed to get valid irq for cluster %ld\n",
fw_cluster_id);
if (irq < 0)
return irq;
}
irq_set_status_flags(irq, IRQ_NOAUTOEN);
cluster->irq = irq;

4
drivers/perf/xgene_pmu.c
View File

@ -1901,10 +1901,8 @@ static int xgene_pmu_probe(struct platform_device *pdev)
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "No IRQ resource\n");
if (irq < 0)
return -EINVAL;
}
rc = devm_request_irq(&pdev->dev, irq, xgene_pmu_isr,
IRQF_NOBALANCING | IRQF_NO_THREAD,

6
include/asm-generic/error-injection.h
View File

@ -16,6 +16,8 @@ struct error_injection_entry {
int etype;
};
struct pt_regs;
#ifdef CONFIG_FUNCTION_ERROR_INJECTION
/*
* Whitelist ganerating macro. Specify functions which can be
@ -28,8 +30,12 @@ static struct error_injection_entry __used \
.addr = (unsigned long)fname, \
.etype = EI_ETYPE_##_etype, \
};
void override_function_with_return(struct pt_regs *regs);
#else
#define ALLOW_ERROR_INJECTION(fname, _etype)
static inline void override_function_with_return(struct pt_regs *regs) { }
#endif
#endif

5
include/linux/acpi.h
View File

@ -1302,11 +1302,16 @@ static inline int lpit_read_residency_count_address(u64 *address)
#endif
#ifdef CONFIG_ACPI_PPTT
int acpi_pptt_cpu_is_thread(unsigned int cpu);
int find_acpi_cpu_topology(unsigned int cpu, int level);
int find_acpi_cpu_topology_package(unsigned int cpu);
int find_acpi_cpu_topology_hetero_id(unsigned int cpu);
int find_acpi_cpu_cache_topology(unsigned int cpu, int level);
#else
static inline int acpi_pptt_cpu_is_thread(unsigned int cpu)
{
return -EINVAL;
}
static inline int find_acpi_cpu_topology(unsigned int cpu, int level)
{
return -EINVAL;

26
include/linux/arch_topology.h
View File

@ -33,4 +33,30 @@ unsigned long topology_get_freq_scale(int cpu)
return per_cpu(freq_scale, cpu);
}
struct cpu_topology {
int thread_id;
int core_id;
int package_id;
int llc_id;
cpumask_t thread_sibling;
cpumask_t core_sibling;
cpumask_t llc_sibling;
};
#ifdef CONFIG_GENERIC_ARCH_TOPOLOGY
extern struct cpu_topology cpu_topology[NR_CPUS];
#define topology_physical_package_id(cpu) (cpu_topology[cpu].package_id)
#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)
#define topology_llc_cpumask(cpu) (&cpu_topology[cpu].llc_sibling)
void init_cpu_topology(void);
void store_cpu_topology(unsigned int cpuid);
const struct cpumask *cpu_coregroup_mask(int cpu);
void update_siblings_masks(unsigned int cpu);
void remove_cpu_topology(unsigned int cpuid);
void reset_cpu_topology(void);
#endif
#endif /* _LINUX_ARCH_TOPOLOGY_H_ */

17
include/linux/cpuidle.h
View File

@ -256,7 +256,10 @@ static inline int cpuidle_register_governor(struct cpuidle_governor *gov)
{return 0;}
#endif
#define __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, is_retention) \
#define __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, \
idx, \
state, \
is_retention) \
({ \
int __ret = 0; \
\
@ -268,7 +271,7 @@ static inline int cpuidle_register_governor(struct cpuidle_governor *gov)
if (!is_retention) \
__ret = cpu_pm_enter(); \
if (!__ret) { \
__ret = low_level_idle_enter(idx); \
__ret = low_level_idle_enter(state); \
if (!is_retention) \
cpu_pm_exit(); \
} \
@ -277,9 +280,15 @@ static inline int cpuidle_register_governor(struct cpuidle_governor *gov)
})
#define CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx) \
__CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, 0)
__CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, idx, 0)
#define CPU_PM_CPU_IDLE_ENTER_RETENTION(low_level_idle_enter, idx) \
__CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, 1)
__CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, idx, 1)
#define CPU_PM_CPU_IDLE_ENTER_PARAM(low_level_idle_enter, idx, state) \
__CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, state, 0)
#define CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM(low_level_idle_enter, idx, state) \
__CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, state, 1)
#endif /* _LINUX_CPUIDLE_H */

6
include/linux/error-injection.h
View File

@ -2,16 +2,16 @@
#ifndef _LINUX_ERROR_INJECTION_H
#define _LINUX_ERROR_INJECTION_H
#ifdef CONFIG_FUNCTION_ERROR_INJECTION
#include <linux/compiler.h>
#include <asm-generic/error-injection.h>
#include <asm/error-injection.h>
#ifdef CONFIG_FUNCTION_ERROR_INJECTION
extern bool within_error_injection_list(unsigned long addr);
extern int get_injectable_error_type(unsigned long addr);
#else /* !CONFIG_FUNCTION_ERROR_INJECTION */
#include <asm-generic/error-injection.h>
static inline bool within_error_injection_list(unsigned long addr)
{
return false;

4
include/linux/psci.h
View File

@ -15,8 +15,8 @@
bool psci_tos_resident_on(int cpu);
int psci_cpu_init_idle(unsigned int cpu);
int psci_cpu_suspend_enter(unsigned long index);
int psci_cpu_suspend_enter(u32 state);
bool psci_power_state_is_valid(u32 state);
enum psci_conduit {
PSCI_CONDUIT_NONE,

1
include/linux/random.h
View File

@ -19,6 +19,7 @@ struct random_ready_callback {
};
extern void add_device_randomness(const void *, unsigned int);
extern void add_bootloader_randomness(const void *, unsigned int);
#if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
static inline void add_latent_entropy(void)

1
include/linux/topology.h
View File

@ -27,6 +27,7 @@
#ifndef _LINUX_TOPOLOGY_H
#define _LINUX_TOPOLOGY_H
#include <linux/arch_topology.h>
#include <linux/cpumask.h>
#include <linux/bitops.h>
#include <linux/mmzone.h>

5
include/uapi/linux/prctl.h
View File

@ -229,4 +229,9 @@ struct prctl_mm_map {
# define PR_PAC_APDBKEY (1UL << 3)
# define PR_PAC_APGAKEY (1UL << 4)
/* Tagged user address controls for arm64 */
#define PR_SET_TAGGED_ADDR_CTRL 55
#define PR_GET_TAGGED_ADDR_CTRL 56
# define PR_TAGGED_ADDR_ENABLE (1UL << 0)
#endif /* _LINUX_PRCTL_H */

16
kernel/sys.c
View File

@ -124,6 +124,12 @@
#ifndef PAC_RESET_KEYS
# define PAC_RESET_KEYS(a, b) (-EINVAL)
#endif
#ifndef SET_TAGGED_ADDR_CTRL
# define SET_TAGGED_ADDR_CTRL(a) (-EINVAL)
#endif
#ifndef GET_TAGGED_ADDR_CTRL
# define GET_TAGGED_ADDR_CTRL() (-EINVAL)
#endif
/*
* this is where the system-wide overflow UID and GID are defined, for
@ -2492,6 +2498,16 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
return -EINVAL;
error = PAC_RESET_KEYS(me, arg2);
break;
case PR_SET_TAGGED_ADDR_CTRL:
if (arg3 || arg4 || arg5)
return -EINVAL;
error = SET_TAGGED_ADDR_CTRL(arg2);
break;
case PR_GET_TAGGED_ADDR_CTRL:
if (arg2 || arg3 || arg4 || arg5)
return -EINVAL;
error = GET_TAGGED_ADDR_CTRL();
break;
default:
error = -EINVAL;
break;

11
scripts/Makefile.kasan
View File

@ -1,4 +1,9 @@
# SPDX-License-Identifier: GPL-2.0
ifdef CONFIG_KASAN
CFLAGS_KASAN_NOSANITIZE := -fno-builtin
KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
endif
ifdef CONFIG_KASAN_GENERIC
ifdef CONFIG_KASAN_INLINE
@ -7,8 +12,6 @@ else
call_threshold := 0
endif
KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
@ -45,7 +48,3 @@ CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
$(instrumentation_flags)
endif # CONFIG_KASAN_SW_TAGS
ifdef CONFIG_KASAN
CFLAGS_KASAN_NOSANITIZE := -fno-builtin
endif

1
tools/testing/selftests/arm64/.gitignore vendored Normal file
View File

@ -0,0 +1 @@
tags_test

11
tools/testing/selftests/arm64/Makefile Normal file
View File

@ -0,0 +1,11 @@
# SPDX-License-Identifier: GPL-2.0
# ARCH can be overridden by the user for cross compiling
ARCH ?= $(shell uname -m 2>/dev/null || echo not)
ifneq (,$(filter $(ARCH),aarch64 arm64))
TEST_GEN_PROGS := tags_test
TEST_PROGS := run_tags_test.sh
endif
include ../lib.mk

12
tools/testing/selftests/arm64/run_tags_test.sh Executable file
View File

@ -0,0 +1,12 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
echo "--------------------"
echo "running tags test"
echo "--------------------"
./tags_test
if [ $? -ne 0 ]; then
echo "[FAIL]"
else
echo "[PASS]"
fi

31
tools/testing/selftests/arm64/tags_test.c Normal file
View File

@ -0,0 +1,31 @@
// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/prctl.h>
#include <sys/utsname.h>
#define SHIFT_TAG(tag) ((uint64_t)(tag) << 56)
#define SET_TAG(ptr, tag) (((uint64_t)(ptr) & ~SHIFT_TAG(0xff)) | \
SHIFT_TAG(tag))
int main(void)
{
static int tbi_enabled = 0;
unsigned long tag = 0;
struct utsname *ptr;
int err;
if (prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0) == 0)
tbi_enabled = 1;
ptr = (struct utsname *)malloc(sizeof(*ptr));
if (tbi_enabled)
tag = 0x42;
ptr = (struct utsname *)SET_TAG(ptr, tag);
err = uname(ptr);
free(ptr);
return err;
}