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drm/amdgpu: optimize VM fencing 

No need to fence every page table, just the page directory is enough.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2016-01-26 11:40:46 +01:00 committed by Alex Deucher
parent a14faa6573
commit a1e08d3b83
1 changed files with 22 additions and 28 deletions
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50
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
View File

@ -624,36 +624,25 @@ static void amdgpu_vm_frag_ptes(struct amdgpu_device *adev,
*
* Global and local mutex must be locked!
*/
static int amdgpu_vm_update_ptes(struct amdgpu_device *adev,
struct amdgpu_gart *gtt,
uint32_t gtt_flags,
struct amdgpu_vm *vm,
struct amdgpu_ib *ib,
uint64_t start, uint64_t end,
uint64_t dst, uint32_t flags)
static void amdgpu_vm_update_ptes(struct amdgpu_device *adev,
struct amdgpu_gart *gtt,
uint32_t gtt_flags,
struct amdgpu_vm *vm,
struct amdgpu_ib *ib,
uint64_t start, uint64_t end,
uint64_t dst, uint32_t flags)
{
uint64_t mask = AMDGPU_VM_PTE_COUNT - 1;
uint64_t last_pte = ~0, last_dst = ~0;
void *owner = AMDGPU_FENCE_OWNER_VM;
unsigned count = 0;
uint64_t addr;
/* sync to everything on unmapping */
if (!(flags & AMDGPU_PTE_VALID))
owner = AMDGPU_FENCE_OWNER_UNDEFINED;
/* walk over the address space and update the page tables */
for (addr = start; addr < end; ) {
uint64_t pt_idx = addr >> amdgpu_vm_block_size;
struct amdgpu_bo *pt = vm->page_tables[pt_idx].entry.robj;
unsigned nptes;
uint64_t pte;
int r;
amdgpu_sync_resv(adev, &ib->sync, pt->tbo.resv, owner);
r = reservation_object_reserve_shared(pt->tbo.resv);
if (r)
return r;
if ((addr & ~mask) == (end & ~mask))
nptes = end - addr;
@ -687,8 +676,6 @@ static int amdgpu_vm_update_ptes(struct amdgpu_device *adev,
last_pte, last_pte + 8 * count,
last_dst, flags);
}
return 0;
}
/**
@ -716,11 +703,16 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
struct fence **fence)
{
struct amdgpu_ring *ring = adev->vm_manager.vm_pte_funcs_ring;
void *owner = AMDGPU_FENCE_OWNER_VM;
unsigned nptes, ncmds, ndw;
struct amdgpu_ib *ib;
struct fence *f = NULL;
int r;
/* sync to everything on unmapping */
if (!(flags & AMDGPU_PTE_VALID))
owner = AMDGPU_FENCE_OWNER_UNDEFINED;
nptes = last - start + 1;
/*
@ -761,15 +753,17 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
return r;
}
ib->length_dw = 0;
r = amdgpu_sync_resv(adev, &ib->sync, vm->page_directory->tbo.resv,
owner);
if (r)
goto error_free;
r = amdgpu_vm_update_ptes(adev, gtt, gtt_flags, vm, ib, start,
last + 1, addr, flags);
if (r) {
amdgpu_ib_free(adev, ib);
kfree(ib);
return r;
}
r = reservation_object_reserve_shared(vm->page_directory->tbo.resv);
if (r)
goto error_free;
amdgpu_vm_update_ptes(adev, gtt, gtt_flags, vm, ib, start, last + 1,
addr, flags);
amdgpu_vm_pad_ib(adev, ib);
WARN_ON(ib->length_dw > ndw);