1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2021 Intel Corporation 4 */ 5 #include <drm/ttm/ttm_bo_driver.h> 6 #include <drm/ttm/ttm_device.h> 7 #include <drm/ttm/ttm_range_manager.h> 8 9 #include "i915_drv.h" 10 #include "i915_scatterlist.h" 11 #include "i915_ttm_buddy_manager.h" 12 13 #include "intel_region_ttm.h" 14 15 #include "gem/i915_gem_ttm.h" /* For the funcs/ops export only */ 16 /** 17 * DOC: TTM support structure 18 * 19 * The code in this file deals with setting up memory managers for TTM 20 * LMEM and MOCK regions and converting the output from 21 * the managers to struct sg_table, Basically providing the mapping from 22 * i915 GEM regions to TTM memory types and resource managers. 23 */ 24 25 /** 26 * intel_region_ttm_device_init - Initialize a TTM device 27 * @dev_priv: Pointer to an i915 device private structure. 28 * 29 * Return: 0 on success, negative error code on failure. 30 */ 31 int intel_region_ttm_device_init(struct drm_i915_private *dev_priv) 32 { 33 struct drm_device *drm = &dev_priv->drm; 34 35 return ttm_device_init(&dev_priv->bdev, i915_ttm_driver(), 36 drm->dev, drm->anon_inode->i_mapping, 37 drm->vma_offset_manager, false, false); 38 } 39 40 /** 41 * intel_region_ttm_device_fini - Finalize a TTM device 42 * @dev_priv: Pointer to an i915 device private structure. 43 */ 44 void intel_region_ttm_device_fini(struct drm_i915_private *dev_priv) 45 { 46 ttm_device_fini(&dev_priv->bdev); 47 } 48 49 /* 50 * Map the i915 memory regions to TTM memory types. We use the 51 * driver-private types for now, reserving TTM_PL_VRAM for stolen 52 * memory and TTM_PL_TT for GGTT use if decided to implement this. 53 */ 54 int intel_region_to_ttm_type(const struct intel_memory_region *mem) 55 { 56 int type; 57 58 GEM_BUG_ON(mem->type != INTEL_MEMORY_LOCAL && 59 mem->type != INTEL_MEMORY_MOCK && 60 mem->type != INTEL_MEMORY_SYSTEM); 61 62 if (mem->type == INTEL_MEMORY_SYSTEM) 63 return TTM_PL_SYSTEM; 64 65 type = mem->instance + TTM_PL_PRIV; 66 GEM_BUG_ON(type >= TTM_NUM_MEM_TYPES); 67 68 return type; 69 } 70 71 /** 72 * intel_region_ttm_init - Initialize a memory region for TTM. 73 * @mem: The region to initialize. 74 * 75 * This function initializes a suitable TTM resource manager for the 76 * region, and if it's a LMEM region type, attaches it to the TTM 77 * device. MOCK regions are NOT attached to the TTM device, since we don't 78 * have one for the mock selftests. 79 * 80 * Return: 0 on success, negative error code on failure. 81 */ 82 int intel_region_ttm_init(struct intel_memory_region *mem) 83 { 84 struct ttm_device *bdev = &mem->i915->bdev; 85 int mem_type = intel_region_to_ttm_type(mem); 86 int ret; 87 88 ret = i915_ttm_buddy_man_init(bdev, mem_type, false, 89 resource_size(&mem->region), 90 mem->min_page_size, PAGE_SIZE); 91 if (ret) 92 return ret; 93 94 mem->region_private = ttm_manager_type(bdev, mem_type); 95 96 return 0; 97 } 98 99 /** 100 * intel_region_ttm_fini - Finalize a TTM region. 101 * @mem: The memory region 102 * 103 * This functions takes down the TTM resource manager associated with the 104 * memory region, and if it was registered with the TTM device, 105 * removes that registration. 106 */ 107 void intel_region_ttm_fini(struct intel_memory_region *mem) 108 { 109 int ret; 110 111 ret = i915_ttm_buddy_man_fini(&mem->i915->bdev, 112 intel_region_to_ttm_type(mem)); 113 GEM_WARN_ON(ret); 114 mem->region_private = NULL; 115 } 116 117 /** 118 * intel_region_ttm_resource_to_st - Convert an opaque TTM resource manager resource 119 * to an sg_table. 120 * @mem: The memory region. 121 * @res: The resource manager resource obtained from the TTM resource manager. 122 * 123 * The gem backends typically use sg-tables for operations on the underlying 124 * io_memory. So provide a way for the backends to translate the 125 * nodes they are handed from TTM to sg-tables. 126 * 127 * Return: A malloced sg_table on success, an error pointer on failure. 128 */ 129 struct sg_table *intel_region_ttm_resource_to_st(struct intel_memory_region *mem, 130 struct ttm_resource *res) 131 { 132 if (mem->is_range_manager) { 133 struct ttm_range_mgr_node *range_node = 134 to_ttm_range_mgr_node(res); 135 136 return i915_sg_from_mm_node(&range_node->mm_nodes[0], 137 mem->region.start); 138 } else { 139 return i915_sg_from_buddy_resource(res, mem->region.start); 140 } 141 } 142 143 #ifdef CONFIG_DRM_I915_SELFTEST 144 /** 145 * intel_region_ttm_resource_alloc - Allocate memory resources from a region 146 * @mem: The memory region, 147 * @size: The requested size in bytes 148 * @flags: Allocation flags 149 * 150 * This functionality is provided only for callers that need to allocate 151 * memory from standalone TTM range managers, without the TTM eviction 152 * functionality. Don't use if you are not completely sure that's the 153 * case. The returned opaque node can be converted to an sg_table using 154 * intel_region_ttm_resource_to_st(), and can be freed using 155 * intel_region_ttm_resource_free(). 156 * 157 * Return: A valid pointer on success, an error pointer on failure. 158 */ 159 struct ttm_resource * 160 intel_region_ttm_resource_alloc(struct intel_memory_region *mem, 161 resource_size_t size, 162 unsigned int flags) 163 { 164 struct ttm_resource_manager *man = mem->region_private; 165 struct ttm_place place = {}; 166 struct ttm_buffer_object mock_bo = {}; 167 struct ttm_resource *res; 168 int ret; 169 170 mock_bo.base.size = size; 171 place.flags = flags; 172 173 ret = man->func->alloc(man, &mock_bo, &place, &res); 174 if (ret == -ENOSPC) 175 ret = -ENXIO; 176 return ret ? ERR_PTR(ret) : res; 177 } 178 179 #endif 180 181 /** 182 * intel_region_ttm_resource_free - Free a resource allocated from a resource manager 183 * @mem: The region the resource was allocated from. 184 * @res: The opaque resource representing an allocation. 185 */ 186 void intel_region_ttm_resource_free(struct intel_memory_region *mem, 187 struct ttm_resource *res) 188 { 189 struct ttm_resource_manager *man = mem->region_private; 190 191 man->func->free(man, res); 192 } 193