drm/amd/amdgpu: Code comments for the amdgpu_ttm.c driver. (v2)
NFC just comments. (v2): Updated based on feedback from Alex Deucher. Signed-off-by: Tom St Denis <tom.stdenis@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Tom St Denis
Alex Deucher
parent
fa19a6e9d0
commit
50da51744f
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@ -63,16 +63,44 @@ static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev);
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/*
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* Global memory.
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*/
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/**
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* amdgpu_ttm_mem_global_init - Initialize and acquire reference to
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* memory object
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*
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* @ref: Object for initialization.
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*
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* This is called by drm_global_item_ref() when an object is being
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* initialized.
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*/
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static int amdgpu_ttm_mem_global_init(struct drm_global_reference *ref)
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{
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return ttm_mem_global_init(ref->object);
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}
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/**
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* amdgpu_ttm_mem_global_release - Drop reference to a memory object
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*
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* @ref: Object being removed
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*
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* This is called by drm_global_item_unref() when an object is being
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* released.
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*/
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static void amdgpu_ttm_mem_global_release(struct drm_global_reference *ref)
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{
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ttm_mem_global_release(ref->object);
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}
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/**
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* amdgpu_ttm_global_init - Initialize global TTM memory reference
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* structures.
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*
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* @adev: AMDGPU device for which the global structures need to be
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* registered.
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*
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* This is called as part of the AMDGPU ttm init from amdgpu_ttm_init()
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* during bring up.
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*/
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static int amdgpu_ttm_global_init(struct amdgpu_device *adev)
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{
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struct drm_global_reference *global_ref;
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@ -80,7 +108,9 @@ static int amdgpu_ttm_global_init(struct amdgpu_device *adev)
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struct drm_sched_rq *rq;
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int r;
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/* ensure reference is false in case init fails */
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adev->mman.mem_global_referenced = false;
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global_ref = &adev->mman.mem_global_ref;
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global_ref->global_type = DRM_GLOBAL_TTM_MEM;
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global_ref->size = sizeof(struct ttm_mem_global);
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@ -146,6 +176,18 @@ static int amdgpu_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
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return 0;
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}
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/**
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* amdgpu_init_mem_type - Initialize a memory manager for a specific
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* type of memory request.
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*
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* @bdev: The TTM BO device object (contains a reference to
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* amdgpu_device)
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* @type: The type of memory requested
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* @man:
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*
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* This is called by ttm_bo_init_mm() when a buffer object is being
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* initialized.
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*/
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static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
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struct ttm_mem_type_manager *man)
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{
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@ -161,6 +203,7 @@ static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
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man->default_caching = TTM_PL_FLAG_CACHED;
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break;
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case TTM_PL_TT:
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/* GTT memory */
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man->func = &amdgpu_gtt_mgr_func;
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man->gpu_offset = adev->gmc.gart_start;
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man->available_caching = TTM_PL_MASK_CACHING;
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@ -193,6 +236,14 @@ static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
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return 0;
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}
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/**
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* amdgpu_evict_flags - Compute placement flags
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*
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* @bo: The buffer object to evict
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* @placement: Possible destination(s) for evicted BO
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*
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* Fill in placement data when ttm_bo_evict() is called
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*/
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static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
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struct ttm_placement *placement)
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{
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@ -204,12 +255,14 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
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.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM
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};
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/* Don't handle scatter gather BOs */
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if (bo->type == ttm_bo_type_sg) {
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placement->num_placement = 0;
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placement->num_busy_placement = 0;
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return;
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}
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/* Object isn't an AMDGPU object so ignore */
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if (!amdgpu_ttm_bo_is_amdgpu_bo(bo)) {
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placement->placement = &placements;
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placement->busy_placement = &placements;
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@ -217,10 +270,12 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
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placement->num_busy_placement = 1;
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return;
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}
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abo = ttm_to_amdgpu_bo(bo);
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switch (bo->mem.mem_type) {
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case TTM_PL_VRAM:
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if (!adev->mman.buffer_funcs_enabled) {
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/* Move to system memory */
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amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_CPU);
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} else if (adev->gmc.visible_vram_size < adev->gmc.real_vram_size &&
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!(abo->flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED) &&
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@ -238,6 +293,7 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
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abo->placement.busy_placement = &abo->placements[1];
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abo->placement.num_busy_placement = 1;
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} else {
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/* Move to GTT memory */
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amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_GTT);
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}
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break;
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@ -248,6 +304,15 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
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*placement = abo->placement;
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}
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/**
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* amdgpu_verify_access - Verify access for a mmap call
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*
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* @bo: The buffer object to map
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* @filp: The file pointer from the process performing the mmap
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*
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* This is called by ttm_bo_mmap() to verify whether a process
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* has the right to mmap a BO to their process space.
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*/
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static int amdgpu_verify_access(struct ttm_buffer_object *bo, struct file *filp)
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{
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struct amdgpu_bo *abo = ttm_to_amdgpu_bo(bo);
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@ -265,6 +330,15 @@ static int amdgpu_verify_access(struct ttm_buffer_object *bo, struct file *filp)
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filp->private_data);
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}
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/**
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* amdgpu_move_null - Register memory for a buffer object
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*
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* @bo: The bo to assign the memory to
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* @new_mem: The memory to be assigned.
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*
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* Assign the memory from new_mem to the memory of the buffer object
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* bo.
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*/
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static void amdgpu_move_null(struct ttm_buffer_object *bo,
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struct ttm_mem_reg *new_mem)
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{
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@ -275,6 +349,10 @@ static void amdgpu_move_null(struct ttm_buffer_object *bo,
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new_mem->mm_node = NULL;
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}
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/**
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* amdgpu_mm_node_addr - Compute the GPU relative offset of a GTT
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* buffer.
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*/
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static uint64_t amdgpu_mm_node_addr(struct ttm_buffer_object *bo,
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struct drm_mm_node *mm_node,
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struct ttm_mem_reg *mem)
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@ -289,9 +367,10 @@ static uint64_t amdgpu_mm_node_addr(struct ttm_buffer_object *bo,
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}
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/**
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* amdgpu_find_mm_node - Helper function finds the drm_mm_node
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* corresponding to @offset. It also modifies the offset to be
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* within the drm_mm_node returned
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* amdgpu_find_mm_node - Helper function finds the drm_mm_node
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* corresponding to @offset. It also modifies
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* the offset to be within the drm_mm_node
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* returned
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*/
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static struct drm_mm_node *amdgpu_find_mm_node(struct ttm_mem_reg *mem,
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unsigned long *offset)
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@ -430,7 +509,12 @@ error:
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return r;
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}
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/**
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* amdgpu_move_blit - Copy an entire buffer to another buffer
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*
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* This is a helper called by amdgpu_bo_move() and
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* amdgpu_move_vram_ram() to help move buffers to and from VRAM.
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*/
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static int amdgpu_move_blit(struct ttm_buffer_object *bo,
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bool evict, bool no_wait_gpu,
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struct ttm_mem_reg *new_mem,
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@ -465,6 +549,11 @@ error:
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return r;
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}
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/**
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* amdgpu_move_vram_ram - Copy VRAM buffer to RAM buffer
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*
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* Called by amdgpu_bo_move().
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*/
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static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo, bool evict,
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struct ttm_operation_ctx *ctx,
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struct ttm_mem_reg *new_mem)
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@ -477,6 +566,8 @@ static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo, bool evict,
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int r;
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adev = amdgpu_ttm_adev(bo->bdev);
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/* create space/pages for new_mem in GTT space */
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tmp_mem = *new_mem;
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tmp_mem.mm_node = NULL;
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placement.num_placement = 1;
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@ -491,25 +582,36 @@ static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo, bool evict,
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return r;
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}
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/* set caching flags */
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r = ttm_tt_set_placement_caching(bo->ttm, tmp_mem.placement);
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if (unlikely(r)) {
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goto out_cleanup;
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}
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/* Bind the memory to the GTT space */
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r = ttm_tt_bind(bo->ttm, &tmp_mem, ctx);
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if (unlikely(r)) {
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goto out_cleanup;
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}
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/* blit VRAM to GTT */
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r = amdgpu_move_blit(bo, true, ctx->no_wait_gpu, &tmp_mem, old_mem);
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if (unlikely(r)) {
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goto out_cleanup;
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}
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/* move BO (in tmp_mem) to new_mem */
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r = ttm_bo_move_ttm(bo, ctx, new_mem);
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out_cleanup:
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ttm_bo_mem_put(bo, &tmp_mem);
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return r;
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}
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/**
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* amdgpu_move_ram_vram - Copy buffer from RAM to VRAM
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*
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* Called by amdgpu_bo_move().
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*/
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static int amdgpu_move_ram_vram(struct ttm_buffer_object *bo, bool evict,
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struct ttm_operation_ctx *ctx,
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struct ttm_mem_reg *new_mem)
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@ -522,6 +624,8 @@ static int amdgpu_move_ram_vram(struct ttm_buffer_object *bo, bool evict,
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int r;
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adev = amdgpu_ttm_adev(bo->bdev);
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/* make space in GTT for old_mem buffer */
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tmp_mem = *new_mem;
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tmp_mem.mm_node = NULL;
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placement.num_placement = 1;
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@ -535,10 +639,14 @@ static int amdgpu_move_ram_vram(struct ttm_buffer_object *bo, bool evict,
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if (unlikely(r)) {
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return r;
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}
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/* move/bind old memory to GTT space */
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r = ttm_bo_move_ttm(bo, ctx, &tmp_mem);
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if (unlikely(r)) {
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goto out_cleanup;
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}
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/* copy to VRAM */
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r = amdgpu_move_blit(bo, true, ctx->no_wait_gpu, new_mem, old_mem);
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if (unlikely(r)) {
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goto out_cleanup;
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@ -548,6 +656,11 @@ out_cleanup:
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return r;
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}
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/**
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* amdgpu_bo_move - Move a buffer object to a new memory location
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*
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* Called by ttm_bo_handle_move_mem()
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*/
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static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
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struct ttm_operation_ctx *ctx,
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struct ttm_mem_reg *new_mem)
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@ -613,6 +726,11 @@ memcpy:
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return 0;
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}
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/**
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* amdgpu_ttm_io_mem_reserve - Reserve a block of memory during a fault
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*
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* Called by ttm_mem_io_reserve() ultimately via ttm_bo_vm_fault()
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*/
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static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
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{
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struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
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@ -690,6 +808,14 @@ struct amdgpu_ttm_tt {
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uint32_t last_set_pages;
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};
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/**
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* amdgpu_ttm_tt_get_user_pages - Pin pages of memory pointed to
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* by a USERPTR pointer to memory
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*
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* Called by amdgpu_gem_userptr_ioctl() and amdgpu_cs_parser_bos().
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* This provides a wrapper around the get_user_pages() call to provide
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* device accessible pages that back user memory.
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*/
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int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
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{
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struct amdgpu_ttm_tt *gtt = (void *)ttm;
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@ -719,6 +845,7 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
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}
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}
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/* loop enough times using contiguous pages of memory */
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do {
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unsigned num_pages = ttm->num_pages - pinned;
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uint64_t userptr = gtt->userptr + pinned * PAGE_SIZE;
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@ -757,6 +884,14 @@ release_pages:
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return r;
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}
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/**
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* amdgpu_ttm_tt_set_user_pages - Copy pages in, putting old pages
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* as necessary.
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*
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* Called by amdgpu_cs_list_validate(). This creates the page list
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* that backs user memory and will ultimately be mapped into the device
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* address space.
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*/
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void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct page **pages)
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{
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struct amdgpu_ttm_tt *gtt = (void *)ttm;
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@ -771,6 +906,11 @@ void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct page **pages)
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}
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}
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/**
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* amdgpu_ttm_tt_mark_user_page - Mark pages as dirty
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*
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* Called while unpinning userptr pages
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*/
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void amdgpu_ttm_tt_mark_user_pages(struct ttm_tt *ttm)
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{
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struct amdgpu_ttm_tt *gtt = (void *)ttm;
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@ -789,7 +929,12 @@ void amdgpu_ttm_tt_mark_user_pages(struct ttm_tt *ttm)
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}
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}
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/* prepare the sg table with the user pages */
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/**
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* amdgpu_ttm_tt_pin_userptr - prepare the sg table with the
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* user pages
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*
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* Called by amdgpu_ttm_backend_bind()
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**/
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static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
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{
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struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
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@ -801,17 +946,20 @@ static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
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enum dma_data_direction direction = write ?
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DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
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/* Allocate an SG array and squash pages into it */
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r = sg_alloc_table_from_pages(ttm->sg, ttm->pages, ttm->num_pages, 0,
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ttm->num_pages << PAGE_SHIFT,
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GFP_KERNEL);
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if (r)
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goto release_sg;
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/* Map SG to device */
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r = -ENOMEM;
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nents = dma_map_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
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if (nents != ttm->sg->nents)
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goto release_sg;
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/* convert SG to linear array of pages and dma addresses */
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drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
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gtt->ttm.dma_address, ttm->num_pages);
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@ -822,6 +970,9 @@ release_sg:
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return r;
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}
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/**
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* amdgpu_ttm_tt_unpin_userptr - Unpin and unmap userptr pages
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*/
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static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
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{
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struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
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@ -835,9 +986,10 @@ static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
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if (!ttm->sg->sgl)
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return;
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/* free the sg table and pages again */
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/* unmap the pages mapped to the device */
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dma_unmap_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
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/* mark the pages as dirty */
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amdgpu_ttm_tt_mark_user_pages(ttm);
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sg_free_table(ttm->sg);
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@ -882,6 +1034,12 @@ gart_bind_fail:
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return r;
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}
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/**
|
||||
* amdgpu_ttm_backend_bind - Bind GTT memory
|
||||
*
|
||||
* Called by ttm_tt_bind() on behalf of ttm_bo_handle_move_mem().
|
||||
* This handles binding GTT memory to the device address space.
|
||||
*/
|
||||
static int amdgpu_ttm_backend_bind(struct ttm_tt *ttm,
|
||||
struct ttm_mem_reg *bo_mem)
|
||||
{
|
||||
|
|
@ -912,7 +1070,10 @@ static int amdgpu_ttm_backend_bind(struct ttm_tt *ttm,
|
|||
return 0;
|
||||
}
|
||||
|
||||
/* compute PTE flags relevant to this BO memory */
|
||||
flags = amdgpu_ttm_tt_pte_flags(adev, ttm, bo_mem);
|
||||
|
||||
/* bind pages into GART page tables */
|
||||
gtt->offset = (u64)bo_mem->start << PAGE_SHIFT;
|
||||
r = amdgpu_gart_bind(adev, gtt->offset, ttm->num_pages,
|
||||
ttm->pages, gtt->ttm.dma_address, flags);
|
||||
|
|
@ -923,6 +1084,9 @@ static int amdgpu_ttm_backend_bind(struct ttm_tt *ttm,
|
|||
return r;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_alloc_gart - Allocate GART memory for buffer object
|
||||
*/
|
||||
int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
|
||||
{
|
||||
struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
|
||||
|
|
@ -938,6 +1102,7 @@ int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
|
|||
amdgpu_gtt_mgr_has_gart_addr(&bo->mem))
|
||||
return 0;
|
||||
|
||||
/* allocate GTT space */
|
||||
tmp = bo->mem;
|
||||
tmp.mm_node = NULL;
|
||||
placement.num_placement = 1;
|
||||
|
|
@ -953,7 +1118,10 @@ int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
|
|||
if (unlikely(r))
|
||||
return r;
|
||||
|
||||
/* compute PTE flags for this buffer object */
|
||||
flags = amdgpu_ttm_tt_pte_flags(adev, bo->ttm, &tmp);
|
||||
|
||||
/* Bind pages */
|
||||
gtt->offset = (u64)tmp.start << PAGE_SHIFT;
|
||||
r = amdgpu_ttm_gart_bind(adev, bo, flags);
|
||||
if (unlikely(r)) {
|
||||
|
|
@ -969,6 +1137,12 @@ int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_recover_gart - Rebind GTT pages
|
||||
*
|
||||
* Called by amdgpu_gtt_mgr_recover() from amdgpu_device_reset() to
|
||||
* rebind GTT pages during a GPU reset.
|
||||
*/
|
||||
int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo)
|
||||
{
|
||||
struct amdgpu_device *adev = amdgpu_ttm_adev(tbo->bdev);
|
||||
|
|
@ -984,12 +1158,19 @@ int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo)
|
|||
return r;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_backend_unbind - Unbind GTT mapped pages
|
||||
*
|
||||
* Called by ttm_tt_unbind() on behalf of ttm_bo_move_ttm() and
|
||||
* ttm_tt_destroy().
|
||||
*/
|
||||
static int amdgpu_ttm_backend_unbind(struct ttm_tt *ttm)
|
||||
{
|
||||
struct amdgpu_device *adev = amdgpu_ttm_adev(ttm->bdev);
|
||||
struct amdgpu_ttm_tt *gtt = (void *)ttm;
|
||||
int r;
|
||||
|
||||
/* if the pages have userptr pinning then clear that first */
|
||||
if (gtt->userptr)
|
||||
amdgpu_ttm_tt_unpin_userptr(ttm);
|
||||
|
||||
|
|
@ -1021,6 +1202,13 @@ static struct ttm_backend_func amdgpu_backend_func = {
|
|||
.destroy = &amdgpu_ttm_backend_destroy,
|
||||
};
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_tt_create - Create a ttm_tt object for a given BO
|
||||
*
|
||||
* @bo: The buffer object to create a GTT ttm_tt object around
|
||||
*
|
||||
* Called by ttm_tt_create().
|
||||
*/
|
||||
static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_buffer_object *bo,
|
||||
uint32_t page_flags)
|
||||
{
|
||||
|
|
@ -1034,6 +1222,8 @@ static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_buffer_object *bo,
|
|||
return NULL;
|
||||
}
|
||||
gtt->ttm.ttm.func = &amdgpu_backend_func;
|
||||
|
||||
/* allocate space for the uninitialized page entries */
|
||||
if (ttm_sg_tt_init(>t->ttm, bo, page_flags)) {
|
||||
kfree(gtt);
|
||||
return NULL;
|
||||
|
|
@ -1041,6 +1231,12 @@ static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_buffer_object *bo,
|
|||
return >t->ttm.ttm;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_tt_populate - Map GTT pages visible to the device
|
||||
*
|
||||
* Map the pages of a ttm_tt object to an address space visible
|
||||
* to the underlying device.
|
||||
*/
|
||||
static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm,
|
||||
struct ttm_operation_ctx *ctx)
|
||||
{
|
||||
|
|
@ -1048,6 +1244,7 @@ static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm,
|
|||
struct amdgpu_ttm_tt *gtt = (void *)ttm;
|
||||
bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
|
||||
|
||||
/* user pages are bound by amdgpu_ttm_tt_pin_userptr() */
|
||||
if (gtt && gtt->userptr) {
|
||||
ttm->sg = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
|
||||
if (!ttm->sg)
|
||||
|
|
@ -1072,9 +1269,17 @@ static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm,
|
|||
}
|
||||
#endif
|
||||
|
||||
/* fall back to generic helper to populate the page array
|
||||
* and map them to the device */
|
||||
return ttm_populate_and_map_pages(adev->dev, >t->ttm, ctx);
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_tt_unpopulate - unmap GTT pages and unpopulate page arrays
|
||||
*
|
||||
* Unmaps pages of a ttm_tt object from the device address space and
|
||||
* unpopulates the page array backing it.
|
||||
*/
|
||||
static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
|
||||
{
|
||||
struct amdgpu_device *adev;
|
||||
|
|
@ -1100,9 +1305,21 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
|
|||
}
|
||||
#endif
|
||||
|
||||
/* fall back to generic helper to unmap and unpopulate array */
|
||||
ttm_unmap_and_unpopulate_pages(adev->dev, >t->ttm);
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_tt_set_userptr - Initialize userptr GTT ttm_tt
|
||||
* for the current task
|
||||
*
|
||||
* @ttm: The ttm_tt object to bind this userptr object to
|
||||
* @addr: The address in the current tasks VM space to use
|
||||
* @flags: Requirements of userptr object.
|
||||
*
|
||||
* Called by amdgpu_gem_userptr_ioctl() to bind userptr pages
|
||||
* to current task
|
||||
*/
|
||||
int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
|
||||
uint32_t flags)
|
||||
{
|
||||
|
|
@ -1127,6 +1344,9 @@ int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
|
|||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_tt_get_usermm - Return memory manager for ttm_tt object
|
||||
*/
|
||||
struct mm_struct *amdgpu_ttm_tt_get_usermm(struct ttm_tt *ttm)
|
||||
{
|
||||
struct amdgpu_ttm_tt *gtt = (void *)ttm;
|
||||
|
|
@ -1140,6 +1360,12 @@ struct mm_struct *amdgpu_ttm_tt_get_usermm(struct ttm_tt *ttm)
|
|||
return gtt->usertask->mm;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_tt_affect_userptr - Determine if a ttm_tt object lays
|
||||
* inside an address range for the
|
||||
* current task.
|
||||
*
|
||||
*/
|
||||
bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
|
||||
unsigned long end)
|
||||
{
|
||||
|
|
@ -1150,10 +1376,16 @@ bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
|
|||
if (gtt == NULL || !gtt->userptr)
|
||||
return false;
|
||||
|
||||
/* Return false if no part of the ttm_tt object lies within
|
||||
* the range
|
||||
*/
|
||||
size = (unsigned long)gtt->ttm.ttm.num_pages * PAGE_SIZE;
|
||||
if (gtt->userptr > end || gtt->userptr + size <= start)
|
||||
return false;
|
||||
|
||||
/* Search the lists of tasks that hold this mapping and see
|
||||
* if current is one of them. If it is return false.
|
||||
*/
|
||||
spin_lock(>t->guptasklock);
|
||||
list_for_each_entry(entry, >t->guptasks, list) {
|
||||
if (entry->task == current) {
|
||||
|
|
@ -1168,6 +1400,10 @@ bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
|
|||
return true;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_tt_userptr_invalidated - Has the ttm_tt object been
|
||||
* invalidated?
|
||||
*/
|
||||
bool amdgpu_ttm_tt_userptr_invalidated(struct ttm_tt *ttm,
|
||||
int *last_invalidated)
|
||||
{
|
||||
|
|
@ -1178,6 +1414,12 @@ bool amdgpu_ttm_tt_userptr_invalidated(struct ttm_tt *ttm,
|
|||
return prev_invalidated != *last_invalidated;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_tt_userptr_needs_pages - Have the pages backing this
|
||||
* ttm_tt object been invalidated
|
||||
* since the last time they've
|
||||
* been set?
|
||||
*/
|
||||
bool amdgpu_ttm_tt_userptr_needs_pages(struct ttm_tt *ttm)
|
||||
{
|
||||
struct amdgpu_ttm_tt *gtt = (void *)ttm;
|
||||
|
|
@ -1188,6 +1430,9 @@ bool amdgpu_ttm_tt_userptr_needs_pages(struct ttm_tt *ttm)
|
|||
return atomic_read(>t->mmu_invalidations) != gtt->last_set_pages;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_tt_is_readonly - Is the ttm_tt object read only?
|
||||
*/
|
||||
bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm)
|
||||
{
|
||||
struct amdgpu_ttm_tt *gtt = (void *)ttm;
|
||||
|
|
@ -1198,6 +1443,12 @@ bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm)
|
|||
return !!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_tt_pte_flags - Compute PTE flags for ttm_tt object
|
||||
*
|
||||
* @ttm: The ttm_tt object to compute the flags for
|
||||
* @mem: The memory registry backing this ttm_tt object
|
||||
*/
|
||||
uint64_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
|
||||
struct ttm_mem_reg *mem)
|
||||
{
|
||||
|
|
@ -1222,6 +1473,16 @@ uint64_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
|
|||
return flags;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_bo_eviction_valuable - Check to see if we can evict
|
||||
* a buffer object.
|
||||
*
|
||||
* Return true if eviction is sensible. Called by
|
||||
* ttm_mem_evict_first() on behalf of ttm_bo_mem_force_space()
|
||||
* which tries to evict buffer objects until it can find space
|
||||
* for a new object and by ttm_bo_force_list_clean() which is
|
||||
* used to clean out a memory space.
|
||||
*/
|
||||
static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
|
||||
const struct ttm_place *place)
|
||||
{
|
||||
|
|
@ -1268,6 +1529,19 @@ static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
|
|||
return ttm_bo_eviction_valuable(bo, place);
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_access_memory - Read or Write memory that backs a
|
||||
* buffer object.
|
||||
*
|
||||
* @bo: The buffer object to read/write
|
||||
* @offset: Offset into buffer object
|
||||
* @buf: Secondary buffer to write/read from
|
||||
* @len: Length in bytes of access
|
||||
* @write: true if writing
|
||||
*
|
||||
* This is used to access VRAM that backs a buffer object via MMIO
|
||||
* access for debugging purposes.
|
||||
*/
|
||||
static int amdgpu_ttm_access_memory(struct ttm_buffer_object *bo,
|
||||
unsigned long offset,
|
||||
void *buf, int len, int write)
|
||||
|
|
@ -1444,13 +1718,22 @@ error_create:
|
|||
adev->fw_vram_usage.reserved_bo = NULL;
|
||||
return r;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_init - Init the memory management (ttm) as well as
|
||||
* various gtt/vram related fields.
|
||||
*
|
||||
* This initializes all of the memory space pools that the TTM layer
|
||||
* will need such as the GTT space (system memory mapped to the device),
|
||||
* VRAM (on-board memory), and on-chip memories (GDS, GWS, OA) which
|
||||
* can be mapped per VMID.
|
||||
*/
|
||||
int amdgpu_ttm_init(struct amdgpu_device *adev)
|
||||
{
|
||||
uint64_t gtt_size;
|
||||
int r;
|
||||
u64 vis_vram_limit;
|
||||
|
||||
/* initialize global references for vram/gtt */
|
||||
r = amdgpu_ttm_global_init(adev);
|
||||
if (r) {
|
||||
return r;
|
||||
|
|
@ -1471,6 +1754,7 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
|
|||
/* We opt to avoid OOM on system pages allocations */
|
||||
adev->mman.bdev.no_retry = true;
|
||||
|
||||
/* Initialize VRAM pool with all of VRAM divided into pages */
|
||||
r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_VRAM,
|
||||
adev->gmc.real_vram_size >> PAGE_SHIFT);
|
||||
if (r) {
|
||||
|
|
@ -1500,6 +1784,10 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
|
|||
return r;
|
||||
}
|
||||
|
||||
/* allocate memory as required for VGA
|
||||
* This is used for VGA emulation and pre-OS scanout buffers to
|
||||
* avoid display artifacts while transitioning between pre-OS
|
||||
* and driver. */
|
||||
if (adev->gmc.stolen_size) {
|
||||
r = amdgpu_bo_create_kernel(adev, adev->gmc.stolen_size, PAGE_SIZE,
|
||||
AMDGPU_GEM_DOMAIN_VRAM,
|
||||
|
|
@ -1511,6 +1799,8 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
|
|||
DRM_INFO("amdgpu: %uM of VRAM memory ready\n",
|
||||
(unsigned) (adev->gmc.real_vram_size / (1024 * 1024)));
|
||||
|
||||
/* Compute GTT size, either bsaed on 3/4th the size of RAM size
|
||||
* or whatever the user passed on module init */
|
||||
if (amdgpu_gtt_size == -1) {
|
||||
struct sysinfo si;
|
||||
|
||||
|
|
@ -1521,6 +1811,8 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
|
|||
}
|
||||
else
|
||||
gtt_size = (uint64_t)amdgpu_gtt_size << 20;
|
||||
|
||||
/* Initialize GTT memory pool */
|
||||
r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_TT, gtt_size >> PAGE_SHIFT);
|
||||
if (r) {
|
||||
DRM_ERROR("Failed initializing GTT heap.\n");
|
||||
|
|
@ -1529,6 +1821,7 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
|
|||
DRM_INFO("amdgpu: %uM of GTT memory ready.\n",
|
||||
(unsigned)(gtt_size / (1024 * 1024)));
|
||||
|
||||
/* Initialize various on-chip memory pools */
|
||||
adev->gds.mem.total_size = adev->gds.mem.total_size << AMDGPU_GDS_SHIFT;
|
||||
adev->gds.mem.gfx_partition_size = adev->gds.mem.gfx_partition_size << AMDGPU_GDS_SHIFT;
|
||||
adev->gds.mem.cs_partition_size = adev->gds.mem.cs_partition_size << AMDGPU_GDS_SHIFT;
|
||||
|
|
@ -1568,6 +1861,7 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
|
|||
}
|
||||
}
|
||||
|
||||
/* Register debugfs entries for amdgpu_ttm */
|
||||
r = amdgpu_ttm_debugfs_init(adev);
|
||||
if (r) {
|
||||
DRM_ERROR("Failed to init debugfs\n");
|
||||
|
|
@ -1576,11 +1870,19 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_late_init - Handle any late initialization for
|
||||
* amdgpu_ttm
|
||||
*/
|
||||
void amdgpu_ttm_late_init(struct amdgpu_device *adev)
|
||||
{
|
||||
/* return the VGA stolen memory (if any) back to VRAM */
|
||||
amdgpu_bo_free_kernel(&adev->stolen_vga_memory, NULL, NULL);
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_fini - De-initialize the TTM memory pools
|
||||
*/
|
||||
void amdgpu_ttm_fini(struct amdgpu_device *adev)
|
||||
{
|
||||
if (!adev->mman.initialized)
|
||||
|
|
@ -1908,6 +2210,11 @@ static const struct drm_info_list amdgpu_ttm_debugfs_list[] = {
|
|||
#endif
|
||||
};
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_vram_read - Linear read access to VRAM
|
||||
*
|
||||
* Accesses VRAM via MMIO for debugging purposes.
|
||||
*/
|
||||
static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
|
||||
size_t size, loff_t *pos)
|
||||
{
|
||||
|
|
@ -1947,6 +2254,11 @@ static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
|
|||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_vram_write - Linear write access to VRAM
|
||||
*
|
||||
* Accesses VRAM via MMIO for debugging purposes.
|
||||
*/
|
||||
static ssize_t amdgpu_ttm_vram_write(struct file *f, const char __user *buf,
|
||||
size_t size, loff_t *pos)
|
||||
{
|
||||
|
|
@ -1995,6 +2307,9 @@ static const struct file_operations amdgpu_ttm_vram_fops = {
|
|||
|
||||
#ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
|
||||
|
||||
/**
|
||||
* amdgpu_ttm_gtt_read - Linear read access to GTT memory
|
||||
*/
|
||||
static ssize_t amdgpu_ttm_gtt_read(struct file *f, char __user *buf,
|
||||
size_t size, loff_t *pos)
|
||||
{
|
||||
|
|
@ -2042,6 +2357,13 @@ static const struct file_operations amdgpu_ttm_gtt_fops = {
|
|||
|
||||
#endif
|
||||
|
||||
/**
|
||||
* amdgpu_iomem_read - Virtual read access to GPU mapped memory
|
||||
*
|
||||
* This function is used to read memory that has been mapped to the
|
||||
* GPU and the known addresses are not physical addresses but instead
|
||||
* bus addresses (e.g., what you'd put in an IB or ring buffer).
|
||||
*/
|
||||
static ssize_t amdgpu_iomem_read(struct file *f, char __user *buf,
|
||||
size_t size, loff_t *pos)
|
||||
{
|
||||
|
|
@ -2050,6 +2372,7 @@ static ssize_t amdgpu_iomem_read(struct file *f, char __user *buf,
|
|||
ssize_t result = 0;
|
||||
int r;
|
||||
|
||||
/* retrieve the IOMMU domain if any for this device */
|
||||
dom = iommu_get_domain_for_dev(adev->dev);
|
||||
|
||||
while (size) {
|
||||
|
|
@ -2062,6 +2385,10 @@ static ssize_t amdgpu_iomem_read(struct file *f, char __user *buf,
|
|||
|
||||
bytes = bytes < size ? bytes : size;
|
||||
|
||||
/* Translate the bus address to a physical address. If
|
||||
* the domain is NULL it means there is no IOMMU active
|
||||
* and the address translation is the identity
|
||||
*/
|
||||
addr = dom ? iommu_iova_to_phys(dom, addr) : addr;
|
||||
|
||||
pfn = addr >> PAGE_SHIFT;
|
||||
|
|
@ -2086,6 +2413,13 @@ static ssize_t amdgpu_iomem_read(struct file *f, char __user *buf,
|
|||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* amdgpu_iomem_write - Virtual write access to GPU mapped memory
|
||||
*
|
||||
* This function is used to write memory that has been mapped to the
|
||||
* GPU and the known addresses are not physical addresses but instead
|
||||
* bus addresses (e.g., what you'd put in an IB or ring buffer).
|
||||
*/
|
||||
static ssize_t amdgpu_iomem_write(struct file *f, const char __user *buf,
|
||||
size_t size, loff_t *pos)
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in New Issue