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Date: Fri, 05 Oct 2012 12:27:51 +0200
From: Christian König <deathsimple@...afone.de>
To: Dmitry Cherkasov <dcherkassov@...il.com>
CC: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Alex Deucher <alexander.deucher@....com>,
Alex Deucher <alexdeucher@...il.com>,
Michel Daenzer <michel.daenzer@....com>, jcmvbkbc@...il.com,
Dmitry Cherkasov <Dmitrii.Cherkasov@....com>
Subject: Re: [RFC] drm/radeon: make dynamic allocation of page tables on demand
in radeon_vm_update_pte v2
Trying to resolve the remaining bugs today. Expect an v3 of the patch
this evening or Monday morning.
Cheers,
Christian.
On 04.10.2012 16:32, Dmitry Cherkasov wrote:
> v2: setup and alloc number of contiguous PTs if possible
>
> Warning: Heaven benchmark /sometimes/ fails with this patch after
> 10 or 15 minutes of working, so any insight is greatly appreciated.
>
> The code is a bit bloated because it's a question how a decent optimization
> should be made: via macros? using structs? etc.
>
> The rationale for struct radeon_pt is that BO may contain several contiguous
> PTs and we should have that u64 gpu_addr to point to actual begining of PT.
>
> I've only tested it on cayman card, should work on SI but who knows? ;)
>
> Please say your ideas.
> ---
> drivers/gpu/drm/radeon/radeon.h | 12 ++
> drivers/gpu/drm/radeon/radeon_gart.c | 263 ++++++++++++++++++++++++++++++++--
> 2 files changed, 260 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
> index b04c064..38d4eda 100644
> --- a/drivers/gpu/drm/radeon/radeon.h
> +++ b/drivers/gpu/drm/radeon/radeon.h
> @@ -659,6 +659,15 @@ struct radeon_ring {
> /* number of entries in page table */
> #define RADEON_VM_PTE_COUNT (1 << RADEON_VM_BLOCK_SIZE)
>
> +struct radeon_pt {
> + /* BO containing the page table */
> + /* radeon_sa_bo_gpu_addr(sa_bo); */
> + struct radeon_sa_bo *bo;
> +
> + /* GPU address of page table */
> + u64 gpu_addr;
> +};
> +
> struct radeon_vm {
> struct list_head list;
> struct list_head va;
> @@ -671,6 +680,9 @@ struct radeon_vm {
> struct radeon_fence *fence;
> /* last flush or NULL if we still need to flush */
> struct radeon_fence *last_flush;
> +
> + /* page tables list */
> + struct radeon_pt *vm_pts;
> };
>
> struct radeon_vm_manager {
> diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
> index 753b7ca..cea918d 100644
> --- a/drivers/gpu/drm/radeon/radeon_gart.c
> +++ b/drivers/gpu/drm/radeon/radeon_gart.c
> @@ -500,6 +500,10 @@ static void radeon_vm_free_pt(struct radeon_device *rdev,
> struct radeon_vm *vm)
> {
> struct radeon_bo_va *bo_va;
> + int i;
> +
> + int driver_table_entries = (rdev->vm_manager.max_pfn >>
> + RADEON_VM_BLOCK_SIZE);
>
> if (!vm->sa_bo)
> return;
> @@ -510,6 +514,14 @@ static void radeon_vm_free_pt(struct radeon_device *rdev,
> list_for_each_entry(bo_va, &vm->va, vm_list) {
> bo_va->valid = false;
> }
> +
> + if (vm->vm_pts == NULL)
> + return;
> +
> + for (i = 0;i < driver_table_entries; i++)
> + radeon_sa_bo_free(rdev, &vm->vm_pts[i].bo, vm->fence);
> +
> + kfree (vm->vm_pts);
> }
>
> /**
> @@ -563,6 +575,9 @@ int radeon_vm_alloc_pt(struct radeon_device *rdev, struct radeon_vm *vm)
> int r;
> u64 *pd_addr;
> int tables_size;
> + int driver_table_size = (rdev->vm_manager.max_pfn >>
> + RADEON_VM_BLOCK_SIZE) *
> + sizeof(struct radeon_pt);
>
> if (vm == NULL) {
> return -EINVAL;
> @@ -570,7 +585,6 @@ int radeon_vm_alloc_pt(struct radeon_device *rdev, struct radeon_vm *vm)
>
> /* allocate enough to cover the current VM size */
> tables_size = RADEON_GPU_PAGE_ALIGN(radeon_vm_directory_size(rdev));
> - tables_size += RADEON_GPU_PAGE_ALIGN(vm->last_pfn * 8);
>
> if (vm->sa_bo != NULL) {
> /* update lru */
> @@ -600,6 +614,16 @@ retry:
> vm->pd_gpu_addr = radeon_sa_bo_gpu_addr(vm->sa_bo);
> memset(pd_addr, 0, tables_size);
>
> + vm->vm_pts = kmalloc(driver_table_size, GFP_KERNEL);
> +
> + if (vm->vm_pts == NULL) {
> + DRM_ERROR("Cannot allocate space for driver page table\n");
> + radeon_sa_bo_free(rdev, &vm->sa_bo, vm->fence);
> + return -ENOMEM;
> + }
> +
> + memset(vm->vm_pts, 0, driver_table_size);
> +
> list_add_tail(&vm->list, &rdev->vm_manager.lru_vm);
> return radeon_vm_bo_update_pte(rdev, vm, rdev->ring_tmp_bo.bo,
> &rdev->ring_tmp_bo.bo->tbo.mem);
> @@ -864,6 +888,69 @@ uint64_t radeon_vm_map_gart(struct radeon_device *rdev, uint64_t addr)
> return result;
> }
>
> +/* setup @count pfns starting at @addr to PTEs starting at @pt_start and
> + * @pde_count pdes starting at @pd_start */
> +
> +static void radeon_vm_map_pfns (struct radeon_device *rdev,
> + uint64_t pt_addr, uint64_t pt_offset,
> + uint64_t addr, uint64_t pte_count,
> + uint64_t pd_start, uint32_t pde_count, uint32_t flags)
> +{
> + if (pde_count == 0 && pte_count == 0)
> + return;
> +
> + radeon_asic_vm_set_page(rdev, pt_addr + pt_offset, addr,
> + pte_count,
> + RADEON_GPU_PAGE_SIZE, flags);
> +
> + radeon_asic_vm_set_page(rdev, pd_start, pt_addr,
> + pde_count,
> + RADEON_VM_PTE_COUNT * 8, RADEON_VM_PAGE_VALID);
> +}
> +
> +int radeon_suballoc_pts(struct radeon_device *rdev, struct radeon_vm *vm, uint64_t start_pt, uint32_t count)
> +{
> + uint32_t i;
> + int r;
> + struct radeon_vm *vm_evict;
> + struct radeon_pt *pt = &vm->vm_pts[start_pt], *pti;
> +retry:
> + r = radeon_sa_bo_new(rdev, &rdev->vm_manager.sa_manager,
> + &pt->bo,
> + RADEON_VM_PTE_COUNT * 8 * count,
> + RADEON_GPU_PAGE_SIZE, false);
> +
> + if (r == -ENOMEM) {
> + if (list_empty(&rdev->vm_manager.lru_vm)) {
> + DRM_ERROR("cannot allocate driver page table"
> + "for vmid = %d", vm->id);
> + return r;
> + }
> +
> + vm_evict = list_first_entry(&rdev->vm_manager.lru_vm,
> + struct radeon_vm, list);
> +
> + mutex_lock(&vm_evict->mutex);
> + radeon_vm_free_pt(rdev, vm_evict);
> + mutex_unlock(&vm_evict->mutex);
> +
> + DRM_INFO("run out of SA memory for PT. Trying to free LRU vm id = %d\n", vm_evict->id);
> +
> + goto retry;
> + }
> +
> + pt->gpu_addr = radeon_sa_bo_gpu_addr(pt->bo);
> +
> + for (i = 1; i < count; i++) {
> + pti = &vm->vm_pts[start_pt + i];
> + pti->bo = NULL;
> + pti->gpu_addr = pt->gpu_addr + i * RADEON_VM_PTE_COUNT * 8;
> + }
> +
> + return 0;
> +}
> +
> +
> /**
> * radeon_vm_bo_update_pte - map a bo into the vm page table
> *
> @@ -886,10 +973,18 @@ 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 nptes, npdes, ndw;
> - uint64_t pe, addr;
> + struct radeon_pt *pt;
> + unsigned nptes, npdes, ndw, count;
> + uint64_t addr;
> uint64_t pfn;
> + uint32_t pfns_to_pt_edge, pfns_to_end;
> int r;
> + uint64_t mem_pfn_offset;
> + uint64_t pfn_idx, last_pfn, pde_num, pte_num;
> + uint64_t pfn_map_start, pde_map_start, pte_map_start, pde_map_count, pte_map_count;
> + uint64_t prev_gpu_addr;
> + char need_alloc, need_map;
> +
>
> /* nothing to do if vm isn't bound */
> if (vm->sa_bo == NULL)
> @@ -971,22 +1066,159 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev,
> radeon_fence_note_sync(vm->fence, ridx);
> }
>
> - /* update page table entries */
> - pe = vm->pd_gpu_addr;
> - pe += radeon_vm_directory_size(rdev);
> - pe += (bo_va->soffset / RADEON_GPU_PAGE_SIZE) * 8;
> + pfn_idx = pfn;
> + last_pfn = pfn_idx + nptes;
> +
> + pfn_map_start = 0;
> + pde_map_start = pfn_idx / RADEON_VM_PTE_COUNT;
> + pte_map_start = pfn_idx % RADEON_VM_PTE_COUNT;
> + pde_map_count = 0;
> + pte_map_count = 0;
> + pte_num = pfn_idx % RADEON_VM_PTE_COUNT;
> + pde_num = pfn_idx / RADEON_VM_PTE_COUNT;
> + pt = &vm->vm_pts[pde_num];
> + prev_gpu_addr = 0;
> +
> + need_alloc = 0;
> + need_map = 0;
> +
> + for (mem_pfn_offset = 0; mem_pfn_offset < nptes;) {
> + pfns_to_end = last_pfn - pfn_idx;
> + pfns_to_pt_edge = RADEON_VM_PTE_COUNT -
> + (pfn_idx % RADEON_VM_PTE_COUNT);
> +
> + count = pfns_to_pt_edge < pfns_to_end ?
> + pfns_to_pt_edge : pfns_to_end;
> +
> + pde_num = pfn_idx / RADEON_VM_PTE_COUNT;
> + pte_num = pfn_idx % RADEON_VM_PTE_COUNT;
> +
> + pt = &vm->vm_pts[pde_num];
> +
> + if (pt->gpu_addr == 0 && prev_gpu_addr == -1) {
> + /* case 1 */
> + /* pt for current pfn_idx is unmapped */
> + /* previous ptes are unmapped */
> + need_alloc = 1;
> + need_map = 1;
> + }
> + else if (pt->gpu_addr != 0 && prev_gpu_addr != -1) {
> + /* case 4 */
> + /* pt for current pfn_idx is mapped */
> + /* previous ptes are mapped */
> +
> + if ( pt->gpu_addr != prev_gpu_addr + RADEON_VM_PTE_COUNT * 8) {
> + /* current pt is not contiguous with previous
> + one */
> + /* flush prior pts */
> +
> + radeon_vm_map_pfns(
> + rdev, vm->vm_pts[pde_map_start].gpu_addr,
> + pte_map_start * 8,
> + addr + pfn_map_start * RADEON_GPU_PAGE_SIZE,
> + pte_map_count,
> + vm->pd_gpu_addr + pde_map_start * 8,
> + pde_map_count,
> + bo_va->flags);
> +
> + pfn_map_start = mem_pfn_offset;
> + pde_map_start = pfn_idx / RADEON_VM_PTE_COUNT;
> + pte_map_start = pfn_idx % RADEON_VM_PTE_COUNT;
> +
> + pde_map_count = 0;
> + pte_map_count = 0;
> + }
> +
> + prev_gpu_addr = pt->gpu_addr;
> +
> + need_alloc = 0;
> + need_map = 1;
> + }
> + else if (pt->gpu_addr == 0 && prev_gpu_addr != -1) {
> + /* case 2 */
> + /* pt for current pfn_idx is unmapped */
> + /* previous ptes are mapped */
>
> - radeon_asic_vm_set_page(rdev, pe, addr, nptes,
> - RADEON_GPU_PAGE_SIZE, bo_va->flags);
> + /* setup prior pdes & ptes here */
>
> - /* update page directory entries */
> - addr = pe;
> + radeon_vm_map_pfns(
> + rdev, vm->vm_pts[pde_map_start].gpu_addr,
> + pte_map_start * 8,
> + addr + pfn_map_start * RADEON_GPU_PAGE_SIZE,
> + pte_map_count,
> + vm->pd_gpu_addr + pde_map_start * 8,
> + pde_map_count,
> + bo_va->flags);
>
> - pe = vm->pd_gpu_addr;
> - pe += ((bo_va->soffset / RADEON_GPU_PAGE_SIZE) >> RADEON_VM_BLOCK_SIZE) * 8;
> + pfn_map_start = mem_pfn_offset;
> + pde_map_start = pfn_idx / RADEON_VM_PTE_COUNT;
> + pte_map_start = pfn_idx % RADEON_VM_PTE_COUNT;
>
> - radeon_asic_vm_set_page(rdev, pe, addr, npdes,
> - RADEON_VM_PTE_COUNT * 8, RADEON_VM_PAGE_VALID);
> + pde_map_count = 0;
> + pte_map_count = 0;
> +
> + prev_gpu_addr = -1;
> +
> + need_alloc = 1;
> + need_map = 1;
> + }
> + else if (pt->gpu_addr != 0 && prev_gpu_addr == -1) {
> + /* case 3 */
> + /* pt for current pfn_idx is mapped */
> + /* previous ptes are unmapped */
> +
> + /* map prior pfns if there are any */
> + if (pfn_map_start < mem_pfn_offset) {
> + radeon_suballoc_pts(rdev, vm,
> + pde_map_start, pde_map_count);
> + radeon_vm_map_pfns(
> + rdev, vm->vm_pts[pde_map_start].gpu_addr,
> + pte_map_start * 8,
> + addr + pfn_map_start * RADEON_GPU_PAGE_SIZE,
> + pte_map_count,
> + vm->pd_gpu_addr + pde_map_start * 8,
> + pde_map_count,
> + bo_va->flags);
> + }
> +
> + pfn_map_start = mem_pfn_offset;
> + pde_map_start = pfn_idx / RADEON_VM_PTE_COUNT;
> + pte_map_start = pfn_idx % RADEON_VM_PTE_COUNT;
> +
> + pde_map_count = 0;
> + pte_map_count = 0;
> +
> + prev_gpu_addr = pt->gpu_addr;
> +
> + need_alloc = 0;
> + need_map = 1;
> +
> + }
> +
> + pde_map_count++;
> + pte_map_count += count;
> +
> + pfn_idx += count;
> + mem_pfn_offset += count;
> + }
> +
> + if (need_alloc) {
> + radeon_suballoc_pts(rdev, vm, pde_map_start, pde_map_count);
> + }
> +
> + if (need_map) {
> + if (vm->vm_pts[pde_map_start].gpu_addr == 0)
> + DRM_ERROR("gpu_addr == 0. smth is wrong\n");
> +
> + radeon_vm_map_pfns(
> + rdev, vm->vm_pts[pde_map_start].gpu_addr,
> + pte_map_start * 8,
> + addr + pfn_map_start * RADEON_GPU_PAGE_SIZE,
> + pte_map_count,
> + vm->pd_gpu_addr + pde_map_start * 8,
> + pde_map_count,
> + bo_va->flags);
> + }
>
> radeon_fence_unref(&vm->fence);
> r = radeon_fence_emit(rdev, &vm->fence, ridx);
> @@ -997,6 +1229,7 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev,
> radeon_ring_unlock_commit(rdev, ring);
> radeon_semaphore_free(rdev, &sem, vm->fence);
> radeon_fence_unref(&vm->last_flush);
> +
> return 0;
> }
>
--
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