On Thu, Sep 13, 2012 at 2:17 PM, Jerome Glisse <j.glisse@xxxxxxxxx> wrote:
> On Thu, Sep 13, 2012 at 10:13 AM, Dmitry Cherkasov
> <dcherkassov@xxxxxxxxx> wrote:
>> PDE/PTE update code uses CP ring for memory writes.
>> All page table entries are preallocated for now in alloc_pt().
>>
>> It is made as whole because it's hard to divide it to several patches
>> that compile and doesn't break anything being applied separately.
>>
>> Tested on cayman card.
>>
>> Signed-off-by: Dmitry Cherkasov <Dmitrii.Cherkasov@xxxxxxx>
>> ---
>> I couldn't test in on SI card, so would be happy if someone could check it there.
>
> I wonder how this could have work as you don't set
> PAGE_TABLE_BLOCK_SIZE field so each page directory entry cover only 1
> page.
I think PAGE_TABLE_BLOCK_SIZE refers number of 4k pages used for PTE
entries per PDE. E.g., 1 4k page contains 512 64 bit PTEs. so if
BLOCK_SIZE is set to 1 page, each PDE points to 1 page (4k) or PTE
entries. If BLOCK_SIZE is 2, each PDE points to 2 pages (8k) or PTEs,
etc.
Alex
>
> Cheers,
> Jerome
>
>>
>> drivers/gpu/drm/radeon/ni.c | 64 ++++++++++++++++++-------
>> drivers/gpu/drm/radeon/radeon.h | 79 +++++++++++++++++++++++++++---
>> drivers/gpu/drm/radeon/radeon_asic.c | 1 +
>> drivers/gpu/drm/radeon/radeon_asic.h | 13 +++--
>> drivers/gpu/drm/radeon/radeon_gart.c | 88 ++++++++++++++++++++++++++++++----
>> drivers/gpu/drm/radeon/si.c | 4 +-
>> 6 files changed, 210 insertions(+), 39 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/radeon/ni.c b/drivers/gpu/drm/radeon/ni.c
>> index b238216..31d9027 100644
>> --- a/drivers/gpu/drm/radeon/ni.c
>> +++ b/drivers/gpu/drm/radeon/ni.c
>> @@ -782,7 +782,7 @@ static int cayman_pcie_gart_enable(struct radeon_device *rdev)
>> (u32)(rdev->dummy_page.addr >> 12));
>> WREG32(VM_CONTEXT1_CNTL2, 0);
>> WREG32(VM_CONTEXT1_CNTL, 0);
>> - WREG32(VM_CONTEXT1_CNTL, ENABLE_CONTEXT | PAGE_TABLE_DEPTH(0) |
>> + WREG32(VM_CONTEXT1_CNTL, ENABLE_CONTEXT | PAGE_TABLE_DEPTH(1) |
>> RANGE_PROTECTION_FAULT_ENABLE_DEFAULT);
>>
>> cayman_pcie_gart_tlb_flush(rdev);
>> @@ -1517,37 +1517,65 @@ uint32_t cayman_vm_page_flags(struct radeon_device *rdev, uint32_t flags)
>> return r600_flags;
>> }
>>
>> -/**
>> - * cayman_vm_set_page - update the page tables using the CP
>> - *
>> - * @rdev: radeon_device pointer
>> - *
>> - * Update the page tables using the CP (cayman-si).
>> - */
>> -void cayman_vm_set_page(struct radeon_device *rdev, struct radeon_vm *vm,
>> - unsigned pfn, struct ttm_mem_reg *mem,
>> - unsigned npages, uint32_t flags)
>> +void cayman_vm_set_page(struct radeon_device *rdev,
>> + struct ttm_mem_reg *mem,
>> + uint64_t pte_gpu_addr,
>> + uint64_t mem_pfn_offset,
>> + unsigned count, uint32_t flags)
>> {
>> struct radeon_ring *ring = &rdev->ring[rdev->asic->vm.pt_ring_index];
>> - uint64_t addr, pt = vm->pt_gpu_addr + pfn * 8;
>> + uint64_t addr;
>> int i;
>>
>> addr = flags = cayman_vm_page_flags(rdev, flags);
>>
>> - radeon_ring_write(ring, PACKET3(PACKET3_ME_WRITE, 1 + npages * 2));
>> - radeon_ring_write(ring, pt & 0xffffffff);
>> - radeon_ring_write(ring, (pt >> 32) & 0xff);
>> - for (i = 0; i < npages; ++i) {
>> + radeon_ring_write(ring, PACKET3(PACKET3_ME_WRITE, 1 + count * 2));
>> + radeon_ring_write(ring, pte_gpu_addr & 0xffffffff);
>> + radeon_ring_write(ring, (pte_gpu_addr >> 32) & 0xff);
>> + for (i = 0; i < count; ++i) {
>> if (mem) {
>> - addr = radeon_vm_get_addr(rdev, mem, i);
>> + addr = radeon_vm_get_addr(rdev, mem,
>> + i + mem_pfn_offset);
>> addr = addr & 0xFFFFFFFFFFFFF000ULL;
>> addr |= flags;
>> }
>> +
>> + radeon_ring_write(ring, addr & 0xffffffff);
>> + radeon_ring_write(ring, (addr >> 32) & 0xffffffff);
>> + }
>> +}
>> +
>> +void cayman_vm_set_pdes(struct radeon_device *rdev,
>> + struct ttm_mem_reg *mem,
>> + struct radeon_vm *vm,
>> + uint64_t pde_index,
>> + unsigned pde_count, uint32_t flags)
>> +{
>> + struct radeon_ring *ring = &rdev->ring[rdev->asic->vm.pt_ring_index];
>> + uint64_t addr;
>> + int i;
>> + uint64_t pde_gpu_addr = RADEON_BASE_GPU_ADDR(vm) +
>> + PDE_OFFSET(rdev, pde_index);
>> +
>> + addr = 0;
>> +
>> + radeon_ring_write(ring, PACKET3(PACKET3_ME_WRITE, 1 + pde_count * 2));
>> + radeon_ring_write(ring, pde_gpu_addr & 0xffffffff);
>> + radeon_ring_write(ring, (pde_gpu_addr >> 32) & 0xff);
>> +
>> + for (i = 0; i < pde_count; ++i) {
>> + addr = RADEON_BASE_GPU_ADDR(vm) +
>> + PTE_OFFSET(rdev, i + pde_index, 0);
>> + addr = addr & 0xFFFFFFFFFFFFF000ULL;
>> + addr |= flags;
>> +
>> radeon_ring_write(ring, addr & 0xffffffff);
>> radeon_ring_write(ring, (addr >> 32) & 0xffffffff);
>> }
>> }
>>
>> +
>> +
>> /**
>> * cayman_vm_flush - vm flush using the CP
>> *
>> @@ -1571,7 +1599,7 @@ void cayman_vm_flush(struct radeon_device *rdev, struct radeon_ib *ib)
>> radeon_ring_write(ring, vm->last_pfn);
>>
>> radeon_ring_write(ring, PACKET0(VM_CONTEXT0_PAGE_TABLE_BASE_ADDR + (vm->id << 2), 0));
>> - radeon_ring_write(ring, vm->pt_gpu_addr >> 12);
>> + radeon_ring_write(ring, vm->pd_gpu_addr >> 12);
>>
>> /* flush hdp cache */
>> radeon_ring_write(ring, PACKET0(HDP_MEM_COHERENCY_FLUSH_CNTL, 0));
>> diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
>> index 4d67f0f..062896f 100644
>> --- a/drivers/gpu/drm/radeon/radeon.h
>> +++ b/drivers/gpu/drm/radeon/radeon.h
>> @@ -655,8 +655,8 @@ struct radeon_vm {
>> struct list_head va;
>> unsigned id;
>> unsigned last_pfn;
>> - u64 pt_gpu_addr;
>> - u64 *pt;
>> + u64 pd_gpu_addr;
>> + u64 __iomem *pd_addr;
>> struct radeon_sa_bo *sa_bo;
>> struct mutex mutex;
>> /* last fence for cs using this vm */
>> @@ -679,6 +679,57 @@ struct radeon_vm_manager {
>> bool enabled;
>> };
>>
>> +
>> +
>> +/* We consider the case where BLOCK_SIZE is 0 */
>> +/* So PDE is 19 bits long, PTE is 9 and OFFSET is 12 */
>> +#define RADEON_BLOCK_SIZE 0
>> +
>> +/* By default there are 512 entries in Page Table */
>> +#define RADEON_DEFAULT_PTE_COUNT (1 << 9)
>> +
>> +/* number of PTEs in Page Table */
>> +#define RADEON_PTE_COUNT (RADEON_DEFAULT_PTE_COUNT << RADEON_BLOCK_SIZE)
>> +
>> +/* Get last PDE number containing nth PTE */
>> +#define RADEON_GET_LAST_PDE_FOR_PFN(_n) ((_n) / RADEON_PTE_COUNT)
>> +
>> +/* Get PTE number to containing nth pfn */
>> +#define RADEON_GET_PTE_FOR_PFN(_n) ((_n) % RADEON_PTE_COUNT)
>> +
>> +/* Number of PDE tables to cover n PTEs */
>> +#define RADEON_PDE_COUNT_FOR_N_PAGES(_n) \
>> + (((_n) + RADEON_PTE_COUNT - 1) / RADEON_PTE_COUNT)
>> +
>> +/* Number of PDE tables to cover max_pfn (maximum number of PTEs) */
>> +#define RADEON_TOTAL_PDE_COUNT(rdev) \
>> + RADEON_PDE_COUNT_FOR_N_PAGES(rdev->vm_manager.max_pfn)
>> +
>> +#define PTE_SIZE 8
>> +#define PDE_SIZE 8
>> +
>> +/* offset for nth PDE starting from beginning of PDE table */
>> +#define PDE_OFFSET(_rdev, _npde) ((_npde) * PDE_SIZE)
>> +
>> +#define PT_OFFSET(_rdev) \
>> + (RADEON_GPU_PAGE_ALIGN(RADEON_TOTAL_PDE_COUNT(rdev) * PDE_SIZE))
>> +
>> +/* offset for nth PTE of mth PDE starting from beginning of PDE table */
>> +#define PTE_OFFSET(_rdev, _npde, _npte) \
>> + (PT_OFFSET(_rdev) + \
>> + (_npde) * RADEON_PTE_COUNT * PTE_SIZE + \
>> + (_npte) * PTE_SIZE)
>> +
>> +/* cpu address of gpuvm page table */
>> +#define RADEON_BASE_CPU_ADDR(_vm) \
>> + radeon_sa_bo_cpu_addr(vm->sa_bo)
>> +
>> +/* gpu address of gpuvm page table */
>> +#define RADEON_BASE_GPU_ADDR(_vm) \
>> + radeon_sa_bo_gpu_addr(vm->sa_bo)
>> +
>> +#define RADEON_PDE_FLAG_VALID 1
>> +
>> /*
>> * file private structure
>> */
>> @@ -1141,9 +1192,20 @@ struct radeon_asic {
>> void (*fini)(struct radeon_device *rdev);
>>
>> u32 pt_ring_index;
>> - void (*set_page)(struct radeon_device *rdev, struct radeon_vm *vm,
>> - unsigned pfn, struct ttm_mem_reg *mem,
>> - unsigned npages, uint32_t flags);
>> + void (*set_page)(
>> + struct radeon_device *rdev,
>> + struct ttm_mem_reg *mem,
>> + uint64_t pte_gpu_addr, uint64_t mem_pfn_offset,
>> + unsigned count, uint32_t flags
>> +);
>> +
>> + void (*set_pdes)(
>> + struct radeon_device *rdev,
>> + struct ttm_mem_reg *mem,
>> + struct radeon_vm *vm,
>> + uint64_t pde_index,
>> + unsigned pde_count, uint32_t flags);
>> +
>> } vm;
>> /* ring specific callbacks */
>> struct {
>> @@ -1755,7 +1817,12 @@ void radeon_ring_write(struct radeon_ring *ring, uint32_t v);
>> #define radeon_gart_set_page(rdev, i, p) (rdev)->asic->gart.set_page((rdev), (i), (p))
>> #define radeon_asic_vm_init(rdev) (rdev)->asic->vm.init((rdev))
>> #define radeon_asic_vm_fini(rdev) (rdev)->asic->vm.fini((rdev))
>> -#define radeon_asic_vm_set_page(rdev, v, pfn, mem, npages, flags) (rdev)->asic->vm.set_page((rdev), (v), (pfn), (mem), (npages), (flags))
>> +#define radeon_asic_vm_set_page(rdev, mem, start_pte, start_pfn, count, flags) \
>> +((rdev)->asic->vm.set_page((rdev), (mem), (start_pte), (start_pfn), \
>> + (count), (flags)))
>> +#define radeon_asic_vm_set_pdes(rdev, mem, vm, pde_index, pde_count, flags) \
>> +((rdev)->asic->vm.set_pdes((rdev), (mem), (vm), (pde_index), \
>> + (pde_count), (flags)))
>> #define radeon_ring_start(rdev, r, cp) (rdev)->asic->ring[(r)].ring_start((rdev), (cp))
>> #define radeon_ring_test(rdev, r, cp) (rdev)->asic->ring[(r)].ring_test((rdev), (cp))
>> #define radeon_ib_test(rdev, r, cp) (rdev)->asic->ring[(r)].ib_test((rdev), (cp))
>> diff --git a/drivers/gpu/drm/radeon/radeon_asic.c b/drivers/gpu/drm/radeon/radeon_asic.c
>> index 2f7adea..0df6a55 100644
>> --- a/drivers/gpu/drm/radeon/radeon_asic.c
>> +++ b/drivers/gpu/drm/radeon/radeon_asic.c
>> @@ -1377,6 +1377,7 @@ static struct radeon_asic cayman_asic = {
>> .fini = &cayman_vm_fini,
>> .pt_ring_index = RADEON_RING_TYPE_GFX_INDEX,
>> .set_page = &cayman_vm_set_page,
>> + .set_pdes = &cayman_vm_set_pdes,
>> },
>> .ring = {
>> [RADEON_RING_TYPE_GFX_INDEX] = {
>> diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
>> index 29b3d05..7a694c0 100644
>> --- a/drivers/gpu/drm/radeon/radeon_asic.h
>> +++ b/drivers/gpu/drm/radeon/radeon_asic.h
>> @@ -442,9 +442,16 @@ int cayman_vm_init(struct radeon_device *rdev);
>> void cayman_vm_fini(struct radeon_device *rdev);
>> void cayman_vm_flush(struct radeon_device *rdev, struct radeon_ib *ib);
>> uint32_t cayman_vm_page_flags(struct radeon_device *rdev, uint32_t flags);
>> -void cayman_vm_set_page(struct radeon_device *rdev, struct radeon_vm *vm,
>> - unsigned pfn, struct ttm_mem_reg *mem,
>> - unsigned npages, uint32_t flags);
>> +void cayman_vm_set_page(struct radeon_device *rdev,
>> + struct ttm_mem_reg *mem,
>> + uint64_t pte_gpu_addr, uint64_t mem_pfn_offset,
>> + unsigned count, uint32_t flags);
>> +void cayman_vm_set_pdes(struct radeon_device *rdev,
>> + struct ttm_mem_reg *mem,
>> + struct radeon_vm *vm,
>> + uint64_t pde_index,
>> + unsigned pde_count, uint32_t flags);
>> +
>> int evergreen_ib_parse(struct radeon_device *rdev, struct radeon_ib *ib);
>>
>> /* DCE6 - SI */
>> diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
>> index 2f28ff3..f9bda6e 100644
>> --- a/drivers/gpu/drm/radeon/radeon_gart.c
>> +++ b/drivers/gpu/drm/radeon/radeon_gart.c
>> @@ -490,7 +490,6 @@ static void radeon_vm_free_pt(struct radeon_device *rdev,
>>
>> list_del_init(&vm->list);
>> radeon_sa_bo_free(rdev, &vm->sa_bo, vm->fence);
>> - vm->pt = NULL;
>>
>> list_for_each_entry(bo_va, &vm->va, vm_list) {
>> bo_va->valid = false;
>> @@ -547,6 +546,10 @@ int radeon_vm_alloc_pt(struct radeon_device *rdev, struct radeon_vm *vm)
>> struct radeon_vm *vm_evict;
>> int r;
>>
>> + int gpuvm_tables_sz =
>> + RADEON_GPU_PAGE_ALIGN(RADEON_TOTAL_PDE_COUNT(rdev) * PDE_SIZE) +
>> + vm->last_pfn * PTE_SIZE;
>> +
>> if (vm == NULL) {
>> return -EINVAL;
>> }
>> @@ -560,7 +563,7 @@ int radeon_vm_alloc_pt(struct radeon_device *rdev, struct radeon_vm *vm)
>>
>> retry:
>> r = radeon_sa_bo_new(rdev, &rdev->vm_manager.sa_manager, &vm->sa_bo,
>> - RADEON_GPU_PAGE_ALIGN(vm->last_pfn * 8),
>> + gpuvm_tables_sz,
>> RADEON_GPU_PAGE_SIZE, false);
>> if (r == -ENOMEM) {
>> if (list_empty(&rdev->vm_manager.lru_vm)) {
>> @@ -576,9 +579,13 @@ retry:
>> return r;
>> }
>>
>> - vm->pt = radeon_sa_bo_cpu_addr(vm->sa_bo);
>> - vm->pt_gpu_addr = radeon_sa_bo_gpu_addr(vm->sa_bo);
>> - memset(vm->pt, 0, RADEON_GPU_PAGE_ALIGN(vm->last_pfn * 8));
>> + DRM_INFO("radeon: reserved %d kb pd & pt tables\n",
>> + gpuvm_tables_sz/1024);
>> +
>> + vm->pd_addr = radeon_sa_bo_cpu_addr(vm->sa_bo);
>> + vm->pd_gpu_addr = radeon_sa_bo_gpu_addr(vm->sa_bo);
>> + memset(vm->pd_addr, 0, gpuvm_tables_sz);
>> +
>>
>> list_add_tail(&vm->list, &rdev->vm_manager.lru_vm);
>> return radeon_vm_bo_update_pte(rdev, vm, rdev->ring_tmp_bo.bo,
>> @@ -861,6 +868,63 @@ u64 radeon_vm_get_addr(struct radeon_device *rdev,
>> }
>>
>> /**
>> + * radeon_vm_bo_set_pages - update PDE and PTE for pfn
>> + *
>> + * @rdev: radeon_device pointer
>> + * @first_pfn: first pfn in bo address space to start mapping from
>> + * @mem: ttm mem
>> + * @vm: requested vm
>> + * @bo: radeon buffer object
>> + *
>> + * Update page directory and table entries for pfn (cayman+).
>> + */
>> +
>> +int radeon_vm_bo_set_pages(struct radeon_device *rdev, struct radeon_vm *vm,
>> + unsigned first_pfn, struct ttm_mem_reg *mem,
>> + unsigned npages, uint32_t flags)
>> +{
>> + u64 pde_num, pte_num, start_pde, pde_count = 0;
>> +
>> + unsigned pt_total, count, pfn_idx;
>> + unsigned last_pfn = first_pfn + npages, pfns_to_pt_edge, pfns_to_end;
>> + unsigned mem_pfn_offset;
>> +
>> + pt_total = RADEON_PDE_COUNT_FOR_N_PAGES(npages);
>> + count = RADEON_PTE_COUNT;
>> +
>> + pfn_idx = first_pfn;
>> +
>> + for (mem_pfn_offset = 0; mem_pfn_offset < npages;) {
>> +
>> + pfns_to_end = last_pfn - pfn_idx;
>> + pfns_to_pt_edge = RADEON_PTE_COUNT -
>> + (pfn_idx % RADEON_PTE_COUNT);
>> +
>> + count = pfns_to_pt_edge < pfns_to_end ?
>> + pfns_to_pt_edge : pfns_to_end;
>> +
>> + pde_num = RADEON_GET_LAST_PDE_FOR_PFN(pfn_idx);
>> + pte_num = RADEON_GET_PTE_FOR_PFN(pfn_idx);
>> +
>> + radeon_asic_vm_set_page(rdev, mem,
>> + vm->pd_gpu_addr +
>> + PTE_OFFSET(rdev, pde_num, pte_num),
>> + mem_pfn_offset, count, flags);
>> + pfn_idx += count;
>> + mem_pfn_offset += count;
>> +
>> + pde_count++;
>> + }
>> +
>> + start_pde = RADEON_GET_LAST_PDE_FOR_PFN(first_pfn);
>> +
>> + radeon_asic_vm_set_pdes(rdev, mem, vm,
>> + start_pde, pde_count, RADEON_PDE_FLAG_VALID);
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> * radeon_vm_bo_update_pte - map a bo into the vm page table
>> *
>> * @rdev: radeon_device pointer
>> @@ -882,7 +946,7 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev,
>> struct radeon_ring *ring = &rdev->ring[ridx];
>> struct radeon_semaphore *sem = NULL;
>> struct radeon_bo_va *bo_va;
>> - unsigned ngpu_pages, ndw;
>> + unsigned ngpu_pages, ndw, npdes;
>> uint64_t pfn;
>> int r;
>>
>> @@ -935,10 +999,12 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev,
>> }
>> }
>>
>> - /* estimate number of dw needed */
>> + npdes = (RADEON_PDE_COUNT_FOR_N_PAGES(pfn + ngpu_pages) -
>> + RADEON_GET_LAST_PDE_FOR_PFN(pfn));
>> +
>> ndw = 32;
>> - ndw += (ngpu_pages >> 12) * 3;
>> - ndw += ngpu_pages * 2;
>> + ndw += ngpu_pages * 2 + 3 * npdes;
>> + ndw += npdes * 2 + 3;
>>
>> r = radeon_ring_lock(rdev, ring, ndw);
>> if (r) {
>> @@ -950,7 +1016,7 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev,
>> radeon_fence_note_sync(vm->fence, ridx);
>> }
>>
>> - radeon_asic_vm_set_page(rdev, vm, pfn, mem, ngpu_pages, bo_va->flags);
>> + radeon_vm_bo_set_pages(rdev, vm, pfn, mem, ngpu_pages, bo_va->flags);
>>
>> radeon_fence_unref(&vm->fence);
>> r = radeon_fence_emit(rdev, &vm->fence, ridx);
>> @@ -958,9 +1024,11 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev,
>> radeon_ring_unlock_undo(rdev, ring);
>> return r;
>> }
>> +
>> radeon_ring_unlock_commit(rdev, ring);
>> radeon_semaphore_free(rdev, &sem, vm->fence);
>> radeon_fence_unref(&vm->last_flush);
>> +
>> return 0;
>> }
>>
>> diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
>> index 2a5c337..156c994 100644
>> --- a/drivers/gpu/drm/radeon/si.c
>> +++ b/drivers/gpu/drm/radeon/si.c
>> @@ -2426,7 +2426,7 @@ static int si_pcie_gart_enable(struct radeon_device *rdev)
>> WREG32(VM_CONTEXT1_PROTECTION_FAULT_DEFAULT_ADDR,
>> (u32)(rdev->dummy_page.addr >> 12));
>> WREG32(VM_CONTEXT1_CNTL2, 0);
>> - WREG32(VM_CONTEXT1_CNTL, ENABLE_CONTEXT | PAGE_TABLE_DEPTH(0) |
>> + WREG32(VM_CONTEXT1_CNTL, ENABLE_CONTEXT | PAGE_TABLE_DEPTH(1) |
>> RANGE_PROTECTION_FAULT_ENABLE_DEFAULT);
>>
>> si_pcie_gart_tlb_flush(rdev);
>> @@ -2804,7 +2804,7 @@ void si_vm_flush(struct radeon_device *rdev, struct radeon_ib *ib)
>> radeon_ring_write(ring, PACKET0(VM_CONTEXT8_PAGE_TABLE_BASE_ADDR
>> + ((vm->id - 8) << 2), 0));
>> }
>> - radeon_ring_write(ring, vm->pt_gpu_addr >> 12);
>> + radeon_ring_write(ring, vm->pd_gpu_addr >> 12);
>>
>> /* flush hdp cache */
>> radeon_ring_write(ring, PACKET0(HDP_MEM_COHERENCY_FLUSH_CNTL, 0));
>> --
>> 1.7.10.4
>>
>> --
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