diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c')
-rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c new file mode 100644 index 0000000..262e872 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c @@ -0,0 +1,238 @@ +/* + * 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; + uint64_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_gtt_mgr *mgr; + + mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); + if (!mgr) + return -ENOMEM; + + drm_mm_init(&mgr->mm, 0, p_size); + spin_lock_init(&mgr->lock); + 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_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. + */ +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_gtt_mgr *mgr = man->priv; + struct drm_mm_node *node = mem->mm_node; + enum drm_mm_search_flags sflags = DRM_MM_SEARCH_BEST; + enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT; + unsigned long fpfn, lpfn; + int r; + + if (node->start != AMDGPU_BO_INVALID_OFFSET) + return 0; + + if (place) + fpfn = place->fpfn; + else + fpfn = 0; + + if (place && place->lpfn) + lpfn = place->lpfn; + else + lpfn = man->size; + + if (place && place->flags & TTM_PL_FLAG_TOPDOWN) { + sflags = DRM_MM_SEARCH_BELOW; + aflags = DRM_MM_CREATE_TOP; + } + + spin_lock(&mgr->lock); + r = drm_mm_insert_node_in_range_generic(&mgr->mm, node, mem->num_pages, + mem->page_alignment, 0, + fpfn, lpfn, sflags, aflags); + spin_unlock(&mgr->lock); + + if (!r) { + mem->start = node->start; + tbo->offset = (tbo->mem.start << PAGE_SHIFT) + + tbo->bdev->man[tbo->mem.mem_type].gpu_offset; + } + + 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 (mgr->available < mem->num_pages) { + spin_unlock(&mgr->lock); + return 0; + } + mgr->available -= mem->num_pages; + spin_unlock(&mgr->lock); + + node = kzalloc(sizeof(*node), GFP_KERNEL); + if (!node) + return -ENOMEM; + + node->start = AMDGPU_BO_INVALID_OFFSET; + 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; + } + } else { + mem->start = node->start; + } + + return 0; +} + +/** + * 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); + mgr->available += mem->num_pages; + spin_unlock(&mgr->lock); + + kfree(node); + mem->mm_node = NULL; +} + +/** + * amdgpu_gtt_mgr_debug - dump VRAM table + * + * @man: TTM memory type manager + * @prefix: text prefix + * + * Dump the table content using printk. + */ +static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man, + const char *prefix) +{ + struct amdgpu_gtt_mgr *mgr = man->priv; + + spin_lock(&mgr->lock); + drm_mm_debug_table(&mgr->mm, prefix); + spin_unlock(&mgr->lock); +} + +const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = { + amdgpu_gtt_mgr_init, + amdgpu_gtt_mgr_fini, + amdgpu_gtt_mgr_new, + amdgpu_gtt_mgr_del, + amdgpu_gtt_mgr_debug +}; |