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drm/amdgpu: Add notifier lock for KFD userptrs

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Add a per-process MMU notifier lock for processing notifiers from
userptrs. Use that lock to properly synchronize page table updates with
MMU notifiers.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Xiaogang Chen<Xiaogang.Chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling
2021-04-21 21:09:54 -04:00
committed by Alex Deucher
parent fe6872adb0
commit f95f51a4c3
6 changed files with 172 additions and 91 deletions
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17
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
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@@ -695,8 +695,19 @@ out_unlock:
return r;
}
/* amdgpu_ttm_tt_discard_user_pages - Discard range and pfn array allocations
*/
void amdgpu_ttm_tt_discard_user_pages(struct ttm_tt *ttm,
struct hmm_range *range)
{
struct amdgpu_ttm_tt *gtt = (void *)ttm;
if (gtt && gtt->userptr && range)
amdgpu_hmm_range_get_pages_done(range);
}
/*
* amdgpu_ttm_tt_userptr_range_done - stop HMM track the CPU page table change
* amdgpu_ttm_tt_get_user_pages_done - stop HMM track the CPU page table change
* Check if the pages backing this ttm range have been invalidated
*
* Returns: true if pages are still valid
@@ -714,10 +725,6 @@ bool amdgpu_ttm_tt_get_user_pages_done(struct ttm_tt *ttm,
WARN_ONCE(!range->hmm_pfns, "No user pages to check\n");
/*
* FIXME: Must always hold notifier_lock for this, and must
* not ignore the return code.
*/
return !amdgpu_hmm_range_get_pages_done(range);
}
#endif