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drm/amdkfd: unregistered svm range not overlap with TTM range

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When creating unregistered new svm range to recover retry fault, avoid
new svm range to overlap with ranges or userptr ranges managed by TTM,
otherwise svm migration will trigger TTM or userptr eviction, to evict
user queues unexpectedly.

Change helper amdgpu_ttm_tt_affect_userptr to return userptr which is
inside the range. Add helper svm_range_check_vm_userptr to scan all
userptr of the vm, and return overlap userptr bo start, last.

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
2021-10-11 23:12:25 -04:00
committed by Alex Deucher
parent f23750b5b3
commit 43fc10c187
3 changed files with 95 additions and 8 deletions
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4
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
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@@ -1235,7 +1235,7 @@ struct mm_struct *amdgpu_ttm_tt_get_usermm(struct ttm_tt *ttm)
*
*/
bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
unsigned long end)
unsigned long end, unsigned long *userptr)
{
struct amdgpu_ttm_tt *gtt = (void *)ttm;
unsigned long size;
@@ -1250,6 +1250,8 @@ bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
if (gtt->userptr > end || gtt->userptr + size <= start)
return false;
if (userptr)
*userptr = gtt->userptr;
return true;
}