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31f408c
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linux
/
drivers
/
gpu
/
drm
/
amd
/
amdgpu
/
amdgpu_gtt_mgr.c
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249 lines (219 loc) · 5.91 KB
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linux
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drivers
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gpu
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drm
/
amd
/
amdgpu
/
amdgpu_gtt_mgr.c
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249 lines (219 loc) · 5.91 KB
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/* * 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_insert_mode mode; 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; 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; if (&tbo->mem == mem) 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) { 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: spin_lock(&mgr->lock); mgr->available += mem->num_pages; spin_unlock(&mgr->lock); 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); 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; struct drm_printer p = drm_debug_printer(prefix); spin_lock(&mgr->lock); drm_mm_print(&mgr->mm, &p); spin_unlock(&mgr->lock); } 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 };
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