| /* |
| * Copyright 2016 Advanced Micro Devices, Inc. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * Authors: Christian König |
| */ |
| |
| #include <drm/drmP.h> |
| #include "amdgpu.h" |
| |
| struct amdgpu_gtt_mgr { |
| struct drm_mm mm; |
| spinlock_t lock; |
| atomic64_t available; |
| }; |
| |
| /** |
| * amdgpu_gtt_mgr_init - init GTT manager and DRM MM |
| * |
| * @man: TTM memory type manager |
| * @p_size: maximum size of GTT |
| * |
| * Allocate and initialize the GTT manager. |
| */ |
| static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man, |
| unsigned long p_size) |
| { |
| struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev); |
| struct amdgpu_gtt_mgr *mgr; |
| uint64_t start, size; |
| |
| mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); |
| if (!mgr) |
| return -ENOMEM; |
| |
| start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS; |
| size = (adev->mc.gart_size >> PAGE_SHIFT) - start; |
| drm_mm_init(&mgr->mm, start, size); |
| spin_lock_init(&mgr->lock); |
| atomic64_set(&mgr->available, p_size); |
| man->priv = mgr; |
| return 0; |
| } |
| |
| /** |
| * amdgpu_gtt_mgr_fini - free and destroy GTT manager |
| * |
| * @man: TTM memory type manager |
| * |
| * Destroy and free the GTT manager, returns -EBUSY if ranges are still |
| * allocated inside it. |
| */ |
| static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man) |
| { |
| struct amdgpu_gtt_mgr *mgr = man->priv; |
| |
| spin_lock(&mgr->lock); |
| if (!drm_mm_clean(&mgr->mm)) { |
| spin_unlock(&mgr->lock); |
| return -EBUSY; |
| } |
| |
| drm_mm_takedown(&mgr->mm); |
| spin_unlock(&mgr->lock); |
| kfree(mgr); |
| man->priv = NULL; |
| return 0; |
| } |
| |
| /** |
| * amdgpu_gtt_mgr_is_allocated - Check if mem has address space |
| * |
| * @mem: the mem object to check |
| * |
| * Check if a mem object has already address space allocated. |
| */ |
| bool amdgpu_gtt_mgr_is_allocated(struct ttm_mem_reg *mem) |
| { |
| struct drm_mm_node *node = mem->mm_node; |
| |
| return (node->start != AMDGPU_BO_INVALID_OFFSET); |
| } |
| |
| /** |
| * amdgpu_gtt_mgr_alloc - allocate new ranges |
| * |
| * @man: TTM memory type manager |
| * @tbo: TTM BO we need this range for |
| * @place: placement flags and restrictions |
| * @mem: the resulting mem object |
| * |
| * Allocate the address space for a node. |
| */ |
| static int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man, |
| struct ttm_buffer_object *tbo, |
| const struct ttm_place *place, |
| struct ttm_mem_reg *mem) |
| { |
| struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev); |
| struct amdgpu_gtt_mgr *mgr = man->priv; |
| struct drm_mm_node *node = mem->mm_node; |
| enum drm_mm_insert_mode mode; |
| unsigned long fpfn, lpfn; |
| int r; |
| |
| if (amdgpu_gtt_mgr_is_allocated(mem)) |
| return 0; |
| |
| if (place) |
| fpfn = place->fpfn; |
| else |
| fpfn = 0; |
| |
| if (place && place->lpfn) |
| lpfn = place->lpfn; |
| else |
| lpfn = adev->gart.num_cpu_pages; |
| |
| mode = DRM_MM_INSERT_BEST; |
| if (place && place->flags & TTM_PL_FLAG_TOPDOWN) |
| mode = DRM_MM_INSERT_HIGH; |
| |
| spin_lock(&mgr->lock); |
| r = drm_mm_insert_node_in_range(&mgr->mm, node, |
| mem->num_pages, mem->page_alignment, 0, |
| fpfn, lpfn, mode); |
| spin_unlock(&mgr->lock); |
| |
| if (!r) |
| mem->start = node->start; |
| |
| return r; |
| } |
| |
| /** |
| * amdgpu_gtt_mgr_new - allocate a new node |
| * |
| * @man: TTM memory type manager |
| * @tbo: TTM BO we need this range for |
| * @place: placement flags and restrictions |
| * @mem: the resulting mem object |
| * |
| * Dummy, allocate the node but no space for it yet. |
| */ |
| static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man, |
| struct ttm_buffer_object *tbo, |
| const struct ttm_place *place, |
| struct ttm_mem_reg *mem) |
| { |
| struct amdgpu_gtt_mgr *mgr = man->priv; |
| struct drm_mm_node *node; |
| int r; |
| |
| spin_lock(&mgr->lock); |
| if (atomic64_read(&mgr->available) < mem->num_pages) { |
| spin_unlock(&mgr->lock); |
| return 0; |
| } |
| atomic64_sub(mem->num_pages, &mgr->available); |
| spin_unlock(&mgr->lock); |
| |
| node = kzalloc(sizeof(*node), GFP_KERNEL); |
| if (!node) { |
| r = -ENOMEM; |
| goto err_out; |
| } |
| |
| node->start = AMDGPU_BO_INVALID_OFFSET; |
| node->size = mem->num_pages; |
| mem->mm_node = node; |
| |
| if (place->fpfn || place->lpfn || place->flags & TTM_PL_FLAG_TOPDOWN) { |
| r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem); |
| if (unlikely(r)) { |
| kfree(node); |
| mem->mm_node = NULL; |
| r = 0; |
| goto err_out; |
| } |
| } else { |
| mem->start = node->start; |
| } |
| |
| return 0; |
| err_out: |
| atomic64_add(mem->num_pages, &mgr->available); |
| |
| return r; |
| } |
| |
| /** |
| * amdgpu_gtt_mgr_del - free ranges |
| * |
| * @man: TTM memory type manager |
| * @tbo: TTM BO we need this range for |
| * @place: placement flags and restrictions |
| * @mem: TTM memory object |
| * |
| * Free the allocated GTT again. |
| */ |
| static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man, |
| struct ttm_mem_reg *mem) |
| { |
| struct amdgpu_gtt_mgr *mgr = man->priv; |
| struct drm_mm_node *node = mem->mm_node; |
| |
| if (!node) |
| return; |
| |
| spin_lock(&mgr->lock); |
| if (node->start != AMDGPU_BO_INVALID_OFFSET) |
| drm_mm_remove_node(node); |
| spin_unlock(&mgr->lock); |
| atomic64_add(mem->num_pages, &mgr->available); |
| |
| kfree(node); |
| mem->mm_node = NULL; |
| } |
| |
| /** |
| * amdgpu_gtt_mgr_usage - return usage of GTT domain |
| * |
| * @man: TTM memory type manager |
| * |
| * Return how many bytes are used in the GTT domain |
| */ |
| uint64_t amdgpu_gtt_mgr_usage(struct ttm_mem_type_manager *man) |
| { |
| struct amdgpu_gtt_mgr *mgr = man->priv; |
| |
| return (u64)(man->size - atomic64_read(&mgr->available)) * PAGE_SIZE; |
| } |
| |
| /** |
| * amdgpu_gtt_mgr_debug - dump VRAM table |
| * |
| * @man: TTM memory type manager |
| * @printer: DRM printer to use |
| * |
| * Dump the table content using printk. |
| */ |
| static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man, |
| struct drm_printer *printer) |
| { |
| struct amdgpu_gtt_mgr *mgr = man->priv; |
| |
| spin_lock(&mgr->lock); |
| drm_mm_print(&mgr->mm, printer); |
| spin_unlock(&mgr->lock); |
| |
| drm_printf(printer, "man size:%llu pages, gtt available:%llu pages, usage:%lluMB\n", |
| man->size, (u64)atomic64_read(&mgr->available), |
| amdgpu_gtt_mgr_usage(man) >> 20); |
| } |
| |
| const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = { |
| .init = amdgpu_gtt_mgr_init, |
| .takedown = amdgpu_gtt_mgr_fini, |
| .get_node = amdgpu_gtt_mgr_new, |
| .put_node = amdgpu_gtt_mgr_del, |
| .debug = amdgpu_gtt_mgr_debug |
| }; |