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drm/amdkfd: Add SVM range mapped_to_gpu flag 

To avoid unnecessary unmap SVM range from GPUs if range is not mapped on
GPUs when migrating the range. This flag will also be used to flush TLB
when updating the existing mapping on GPUs.

It is protected by prange->migrate_mutex and mmap read lock in MMU
notifier callback.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Philip Yang 2022-04-18 21:32:14 -04:00 committed by Alex Deucher
parent 398bb28389
commit 6b9c63a6eb
2 changed files with 17 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/gpu/drm/amd/amdkfd/kfd_svm.c
View File

@ -950,6 +950,7 @@ svm_range_split_adjust(struct svm_range *new, struct svm_range *old,
new->prefetch_loc = old->prefetch_loc;
new->actual_loc = old->actual_loc;
new->granularity = old->granularity;
new->mapped_to_gpu = old->mapped_to_gpu;
bitmap_copy(new->bitmap_access, old->bitmap_access, MAX_GPU_INSTANCE);
bitmap_copy(new->bitmap_aip, old->bitmap_aip, MAX_GPU_INSTANCE);
@ -1203,6 +1204,17 @@ svm_range_unmap_from_gpus(struct svm_range *prange, unsigned long start,
uint32_t gpuidx;
int r = 0;
if (!prange->mapped_to_gpu) {
pr_debug("prange 0x%p [0x%lx 0x%lx] not mapped to GPU\n",
prange, prange->start, prange->last);
return 0;
}
if (prange->start == start && prange->last == last) {
pr_debug("unmap svms 0x%p prange 0x%p\n", prange->svms, prange);
prange->mapped_to_gpu = false;
}
bitmap_or(bitmap, prange->bitmap_access, prange->bitmap_aip,
MAX_GPU_INSTANCE);
p = container_of(prange->svms, struct kfd_process, svms);
@ -1587,8 +1599,10 @@ unlock_out:
addr = next;
}
if (addr == end)
if (addr == end) {
prange->validated_once = true;
prange->mapped_to_gpu = true;
}
unreserve_out:
svm_range_unreserve_bos(&ctx);
@ -1819,6 +1833,7 @@ static struct svm_range *svm_range_clone(struct svm_range *old)
new->prefetch_loc = old->prefetch_loc;
new->actual_loc = old->actual_loc;
new->granularity = old->granularity;
new->mapped_to_gpu = old->mapped_to_gpu;
bitmap_copy(new->bitmap_access, old->bitmap_access, MAX_GPU_INSTANCE);
bitmap_copy(new->bitmap_aip, old->bitmap_aip, MAX_GPU_INSTANCE);

1
drivers/gpu/drm/amd/amdkfd/kfd_svm.h
View File

@ -133,6 +133,7 @@ struct svm_range {
DECLARE_BITMAP(bitmap_access, MAX_GPU_INSTANCE);
DECLARE_BITMAP(bitmap_aip, MAX_GPU_INSTANCE);
bool validated_once;
bool mapped_to_gpu;
};
static inline void svm_range_lock(struct svm_range *prange)