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From 9542776d2b5d87c4c6e736867ef4254d58d2e041 Mon Sep 17 00:00:00 2001
From: christian koenig <christian.koenig@amd.com>
Date: Thu, 19 Apr 2018 11:08:24 +0200
Subject: [PATCH 4507/5725] drm/amdgpu: further optimize amdgpu_vm_handle_moved
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Splice the moved list to a local one to avoid taking the lock over and
over again.
Change-Id: I690a56f9ef5914f781aa584407d9abff2c77f99f
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Kalyan Alle <kalyan.alle@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 29 +++++++++++++++--------------
1 file changed, 15 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 47dfcdb..a8dbd20 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1811,19 +1811,18 @@ int amdgpu_vm_clear_freed(struct amdgpu_device *adev,
int amdgpu_vm_handle_moved(struct amdgpu_device *adev,
struct amdgpu_vm *vm)
{
+ struct amdgpu_bo_va *bo_va, *tmp;
+ struct list_head moved;
bool clear;
- int r = 0;
+ int r;
+ INIT_LIST_HEAD(&moved);
spin_lock(&vm->moved_lock);
- while (!list_empty(&vm->moved)) {
- struct amdgpu_bo_va *bo_va;
- struct reservation_object *resv;
-
- bo_va = list_first_entry(&vm->moved,
- struct amdgpu_bo_va, base.vm_status);
- spin_unlock(&vm->moved_lock);
+ list_splice_init(&vm->moved, &moved);
+ spin_unlock(&vm->moved_lock);
- resv = bo_va->base.bo->tbo.resv;
+ list_for_each_entry_safe(bo_va, tmp, &moved, base.vm_status) {
+ struct reservation_object *resv = bo_va->base.bo->tbo.resv;
/* Per VM BOs never need to bo cleared in the page tables */
if (resv == vm->root.base.bo->tbo.resv)
@@ -1836,17 +1835,19 @@ int amdgpu_vm_handle_moved(struct amdgpu_device *adev,
clear = true;
r = amdgpu_vm_bo_update(adev, bo_va, clear);
- if (r)
- return r;
+ if (r) {
+ spin_lock(&vm->moved_lock);
+ list_splice(&moved, &vm->moved);
+ spin_unlock(&vm->moved_lock);
+ return r;
+ }
if (!clear && resv != vm->root.base.bo->tbo.resv)
reservation_object_unlock(resv);
- spin_lock(&vm->moved_lock);
}
- spin_unlock(&vm->moved_lock);
- return r;
+ return 0;
}
/**
--
2.7.4
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