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drm/amdkfd: clamp queue size to minimum

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[ Upstream commit e90711946b ]

If queue size is less than minimum, clamp it to minimum to prevent
underflow when writing queue mqd.

Signed-off-by: David Yat Sin <David.YatSin@amd.com>
Reviewed-by: Jay Cornwall <jay.cornwall@amd.com>
Reviewed-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Yat Sin 2025-02-25 18:08:02 -05:00 committed by Greg Kroah-Hartman
parent 16961e025b
commit 82b6aaa867
2 changed files with 12 additions and 0 deletions
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10
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
View File

@ -208,6 +208,11 @@ static int set_queue_properties_from_user(struct queue_properties *q_properties,
return -EINVAL;
}
if (args->ring_size < KFD_MIN_QUEUE_RING_SIZE) {
args->ring_size = KFD_MIN_QUEUE_RING_SIZE;
pr_debug("Size lower. clamped to KFD_MIN_QUEUE_RING_SIZE");
}
if (!access_ok((const void __user *) args->read_pointer_address,
sizeof(uint32_t))) {
pr_err("Can't access read pointer\n");
@ -464,6 +469,11 @@ static int kfd_ioctl_update_queue(struct file *filp, struct kfd_process *p,
return -EINVAL;
}
if (args->ring_size < KFD_MIN_QUEUE_RING_SIZE) {
args->ring_size = KFD_MIN_QUEUE_RING_SIZE;
pr_debug("Size lower. clamped to KFD_MIN_QUEUE_RING_SIZE");
}
properties.queue_address = args->ring_base_address;
properties.queue_size = args->ring_size;
properties.queue_percent = args->queue_percentage;

2
include/uapi/linux/kfd_ioctl.h
View File

@ -55,6 +55,8 @@ struct kfd_ioctl_get_version_args {
#define KFD_MAX_QUEUE_PERCENTAGE 100
#define KFD_MAX_QUEUE_PRIORITY 15
#define KFD_MIN_QUEUE_RING_SIZE 1024
struct kfd_ioctl_create_queue_args {
__u64 ring_base_address; /* to KFD */
__u64 write_pointer_address; /* from KFD */