From: Bob Zhou <bobzhou2@amd.com>
Date: Thu, 16 Jul 2026 02:44:36 +0000 (+0800)
Subject: drm/amdgpu: skip clearing empty freed VM list on GEM close
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e3a721753f60c1d4643a729eaf5a8976d285fa0f;p=thirdparty%2Flinux.git

drm/amdgpu: skip clearing empty freed VM list on GEM close

amdgpu_vm_clear_freed() allocates an amdgpu_sync object and walks the VM
reservation fences via amdgpu_sync_resv() before checking whether vm->freed
has anything to clear. Return early when the list is empty to skip this
overhead on a hot path (every GEM close and command submission).

Signed-off-by: Bob Zhou <bobzhou2@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 8ba869e852d4f1b1c0e5ae9225c77f7ceccbe056)
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index f224d33c4bc4..dc6a9d7dd0b2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1553,6 +1553,8 @@ int amdgpu_vm_clear_freed(struct amdgpu_device *adev,
 	struct amdgpu_sync sync;
 	int r;
 
+	if (list_empty(&vm->freed))
+		return 0;
 
 	/*
 	 * Implicitly sync to command submissions in the same VM before