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drm/amdgpu: Add KFD eviction fence

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This fence is used by KFD to keep memory resident while user mode
queues are enabled. Trying to evict memory will trigger the
enable_signaling callback, which starts a KFD eviction, which
involves preempting user mode queues before signaling the fence.
There is one such fence per process.

v2:
* Grab a reference to mm_struct
* Dereference fence after NULL check
* Simplify fence release, no need to signal without anyone waiting
* Added signed-off-by Harish, who is the original author of this code

v3:
* update MAINTAINERS file
* change amd_kfd_ prefix to amdkfd_
* remove useless initialization of variable to NULL

v4:
* set amdkfd_fence_ops to be static
* Suggested by: Fengguang Wu <fengguang.wu@intel.com>

Signed-off-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Felix Kuehling
2018-02-06 20:32:35 -05:00
committed by Oded Gabbay
parent 1029a3f336
commit d8d019ccff
8 changed files with 242 additions and 4 deletions
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21
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
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@@ -31,6 +31,7 @@
#include <drm/drmP.h>
#include "amdgpu.h"
#include "amdgpu_trace.h"
#include "amdgpu_amdkfd.h"
struct amdgpu_sync_entry {
struct hlist_node node;
@@ -85,11 +86,20 @@ static bool amdgpu_sync_same_dev(struct amdgpu_device *adev,
*/
static void *amdgpu_sync_get_owner(struct dma_fence *f)
{
struct drm_sched_fence *s_fence = to_drm_sched_fence(f);
struct drm_sched_fence *s_fence;
struct amdgpu_amdkfd_fence *kfd_fence;
if (!f)
return AMDGPU_FENCE_OWNER_UNDEFINED;
s_fence = to_drm_sched_fence(f);
if (s_fence)
return s_fence->owner;
kfd_fence = to_amdgpu_amdkfd_fence(f);
if (kfd_fence)
return AMDGPU_FENCE_OWNER_KFD;
return AMDGPU_FENCE_OWNER_UNDEFINED;
}
@@ -204,11 +214,18 @@ int amdgpu_sync_resv(struct amdgpu_device *adev,
for (i = 0; i < flist->shared_count; ++i) {
f = rcu_dereference_protected(flist->shared[i],
reservation_object_held(resv));
/* We only want to trigger KFD eviction fences on
* evict or move jobs. Skip KFD fences otherwise.
*/
fence_owner = amdgpu_sync_get_owner(f);
if (fence_owner == AMDGPU_FENCE_OWNER_KFD &&
owner != AMDGPU_FENCE_OWNER_UNDEFINED)
continue;
if (amdgpu_sync_same_dev(adev, f)) {
/* VM updates are only interesting
* for other VM updates and moves.
*/
fence_owner = amdgpu_sync_get_owner(f);
if ((owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
(fence_owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
((owner == AMDGPU_FENCE_OWNER_VM) !=