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Atomic faults that require a move to VRAM > currently retry without attempting to evict mixed mappings or locate > existing VRAM mappings. > > This patch fixes the issue by attempting to evict mixed mappings or find > existing VRAM pages when a move to VRAM fails during atomic fault > handling. > > Fixes: a9ac0fa455b0 ("drm/xe: Strict migration policy for atomic SVM faults") > Signed-off-by: Matthew Brost Reviewed-by: Himal Prasad Ghimiray > --- > drivers/gpu/drm/xe/xe_svm.c | 13 ++++++++++++- > 1 file changed, 12 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c > index 7e2db71ff34e..b268ee0d2271 100644 > --- a/drivers/gpu/drm/xe/xe_svm.c > +++ b/drivers/gpu/drm/xe/xe_svm.c > @@ -1073,7 +1073,17 @@ static int __xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma, > drm_dbg(&vm->xe->drm, > "VRAM allocation failed, falling back to retrying fault, asid=%u, errno=%pe\n", > vm->usm.asid, ERR_PTR(err)); > - goto retry; > + > + /* > + * In the devmem-only case, mixed mappings may > + * be found. The get_pages function will fix > + * these up to a single location, allowing the > + * page fault handler to make forward progress. > + */ > + if (ctx.devmem_only) > + goto get_pages; > + else > + goto retry; > } else { > drm_err(&vm->xe->drm, > "VRAM allocation failed, retry count exceeded, asid=%u, errno=%pe\n", > @@ -1083,6 +1093,7 @@ static int __xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma, > } > } > > +get_pages: > get_pages_start = xe_svm_stats_ktime_get(); > > range_debug(range, "GET PAGES");