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drm/amdgpu: use hmm_pfns instead of array of pages

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we dont need to allocate local array of pages to hold
the pages returned by the hmm, instead we could use
the hmm_range structure itself to get to hmm_pfn
and get the required pages directly.

This avoids call to alloc/free quite a lot.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Suggested-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Sunil Khatri
2025-09-17 20:12:43 +05:30
committed by Alex Deucher
parent ae4d627e43
commit c5b3cc417b
9 changed files with 25 additions and 49 deletions
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8
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
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@@ -708,7 +708,7 @@ struct amdgpu_ttm_tt {
* Calling function must call amdgpu_ttm_tt_userptr_range_done() once and only
* once afterwards to stop HMM tracking
*/
int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages,
int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo,
struct hmm_range **range)
{
struct ttm_tt *ttm = bo->tbo.ttm;
@@ -745,7 +745,7 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages,
readonly = amdgpu_ttm_tt_is_readonly(ttm);
r = amdgpu_hmm_range_get_pages(&bo->notifier, start, ttm->num_pages,
readonly, NULL, pages, range);
readonly, NULL, range);
out_unlock:
mmap_read_unlock(mm);
if (r)
@@ -797,12 +797,12 @@ bool amdgpu_ttm_tt_get_user_pages_done(struct ttm_tt *ttm,
* that backs user memory and will ultimately be mapped into the device
* address space.
*/
void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct page **pages)
void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct hmm_range *range)
{
unsigned long i;
for (i = 0; i < ttm->num_pages; ++i)
ttm->pages[i] = pages ? pages[i] : NULL;
ttm->pages[i] = range ? hmm_pfn_to_page(range->hmm_pfns[i]) : NULL;
}
/*