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https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
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53c98e35dc
Under arch/openrisc, there isn't any place where ioremap() is called. It means that there isn't early ioremap handling needed in openrisc, So the early ioremap handling code in ioremap() of arch/openrisc/mm/ioremap.c is unnecessary and can be removed. And also remove the special handling in iounmap() since no page is got from fixmap pool along with early ioremap code removing in ioremap(). Link: https://lore.kernel.org/linux-mm/YwxfxKrTUtAuejKQ@oscomms1/ Link: https://lkml.kernel.org/r/20230706154520.11257-4-bhe@redhat.com Signed-off-by: Baoquan He <bhe@redhat.com> Acked-by: Stafford Horne <shorne@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: Stafford Horne <shorne@gmail.com> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Brian Cain <bcain@quicinc.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Chris Zankel <chris@zankel.net> Cc: David Laight <David.Laight@ACULAB.COM> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Niklas Schnelle <schnelle@linux.ibm.com> Cc: Rich Felker <dalias@libc.org> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* OpenRISC ioremap.c
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* Modifications for the OpenRISC architecture:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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*/
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#include <linux/vmalloc.h>
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#include <linux/io.h>
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#include <linux/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/fixmap.h>
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#include <asm/bug.h>
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#include <linux/sched.h>
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#include <asm/tlbflush.h>
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extern int mem_init_done;
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/*
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* Remap an arbitrary physical address space into the kernel virtual
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* address space. Needed when the kernel wants to access high addresses
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* directly.
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*
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* NOTE! We need to allow non-page-aligned mappings too: we will obviously
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* have to convert them into an offset in a page-aligned mapping, but the
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* caller shouldn't need to know that small detail.
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*/
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void __iomem *__ref ioremap(phys_addr_t addr, unsigned long size)
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{
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phys_addr_t p;
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unsigned long v;
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unsigned long offset, last_addr;
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struct vm_struct *area = NULL;
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/* Don't allow wraparound or zero size */
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last_addr = addr + size - 1;
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if (!size || last_addr < addr)
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return NULL;
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/*
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* Mappings have to be page-aligned
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*/
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offset = addr & ~PAGE_MASK;
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p = addr & PAGE_MASK;
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size = PAGE_ALIGN(last_addr + 1) - p;
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area = get_vm_area(size, VM_IOREMAP);
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if (!area)
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return NULL;
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v = (unsigned long)area->addr;
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if (ioremap_page_range(v, v + size, p,
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__pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI))) {
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vfree(area->addr);
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return NULL;
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}
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return (void __iomem *)(offset + (char *)v);
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}
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EXPORT_SYMBOL(ioremap);
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void iounmap(volatile void __iomem *addr)
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{
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return vfree((void *)(PAGE_MASK & (unsigned long)addr));
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}
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EXPORT_SYMBOL(iounmap);
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/**
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* OK, this one's a bit tricky... ioremap can get called before memory is
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* initialized (early serial console does this) and will want to alloc a page
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* for its mapping. No userspace pages will ever get allocated before memory
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* is initialized so this applies only to kernel pages. In the event that
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* this is called before memory is initialized we allocate the page using
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* the memblock infrastructure.
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*/
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pte_t __ref *pte_alloc_one_kernel(struct mm_struct *mm)
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{
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pte_t *pte;
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if (likely(mem_init_done)) {
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pte = (pte_t *)get_zeroed_page(GFP_KERNEL);
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} else {
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pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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if (!pte)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, PAGE_SIZE, PAGE_SIZE);
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}
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return pte;
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}
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