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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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15
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
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@@ -29,6 +29,8 @@
#include <linux/mmu_context.h>
#include <kgd_kfd_interface.h>
extern const struct kgd2kfd_calls *kgd2kfd;
struct amdgpu_device;
struct kgd_mem {
@@ -37,6 +39,19 @@ struct kgd_mem {
void *cpu_ptr;
};
/* KFD Memory Eviction */
struct amdgpu_amdkfd_fence {
struct dma_fence base;
struct mm_struct *mm;
spinlock_t lock;
char timeline_name[TASK_COMM_LEN];
};
struct amdgpu_amdkfd_fence *amdgpu_amdkfd_fence_create(u64 context,
struct mm_struct *mm);
bool amdkfd_fence_check_mm(struct dma_fence *f, struct mm_struct *mm);
struct amdgpu_amdkfd_fence *to_amdgpu_amdkfd_fence(struct dma_fence *f);
int amdgpu_amdkfd_init(void);
void amdgpu_amdkfd_fini(void);