drm/xe: Reject BO eviction if BO is bound to current VM

This is a follow up fix for
https://patchwork.freedesktop.org/patch/msgid/20241203021929.1919730-1-oak.zeng@intel.com
The overall goal is to fail vm_bind when there is memory pressure. See more
details in the commit message of above patch. Abbove patch fixes the issue
when user pass in a vm_id parameter during gem_create. If user doesn't pass
in a vm_id during gem_create, above patch doesn't help.

This patch further reject BO eviction (which could be triggered by bo validation)
if BO is bound to the current VM. vm_bind could fail due to the eviction failure.
The BO to VM reverse mapping structure is used to determine whether BO is bound
to VM.

v2:
Move vm_bo definition from function scope to if(evict) clause (Thomas)
Further constraint the condition by adding ctx->resv (Thomas)
Add a short comment describe the change.

Suggested-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Oak Zeng <oak.zeng@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250110210137.3181576-1-oak.zeng@intel.com

diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index 3f5391d416d469c636d951dd6f0a2b3b5ae95dab..4f077c11e8e237c32638c0f7620e60fb36a5249d 100644 (file)
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -713,6 +713,21 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict,
                goto out;
        }
 
+       /* Reject BO eviction if BO is bound to current VM. */
+       if (evict && ctx->resv) {
+               struct drm_gpuvm_bo *vm_bo;
+
+               drm_gem_for_each_gpuvm_bo(vm_bo, &bo->ttm.base) {
+                       struct xe_vm *vm = gpuvm_to_vm(vm_bo->vm);
+
+                       if (xe_vm_resv(vm) == ctx->resv &&
+                           xe_vm_in_preempt_fence_mode(vm)) {
+                               ret = -EBUSY;
+                               goto out;
+                       }
+               }
+       }
+
        /*
         * Failed multi-hop where the old_mem is still marked as
         * TTM_PL_FLAG_TEMPORARY, should just be a dummy move.