2 * Copyright 2016 Advanced Micro Devices, Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
22 * Authors: Christian König
27 struct amdgpu_gtt_mgr {
33 struct amdgpu_gtt_node {
34 struct drm_mm_node node;
35 struct ttm_buffer_object *tbo;
39 * DOC: mem_info_gtt_total
41 * The amdgpu driver provides a sysfs API for reporting current total size of
43 * The file mem_info_gtt_total is used for this, and returns the total size of
44 * the GTT block, in bytes
46 static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev,
47 struct device_attribute *attr, char *buf)
49 struct drm_device *ddev = dev_get_drvdata(dev);
50 struct amdgpu_device *adev = ddev->dev_private;
52 return snprintf(buf, PAGE_SIZE, "%llu\n",
53 (adev->mman.bdev.man[TTM_PL_TT].size) * PAGE_SIZE);
57 * DOC: mem_info_gtt_used
59 * The amdgpu driver provides a sysfs API for reporting current total amount of
61 * The file mem_info_gtt_used is used for this, and returns the current used
62 * size of the GTT block, in bytes
64 static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev,
65 struct device_attribute *attr, char *buf)
67 struct drm_device *ddev = dev_get_drvdata(dev);
68 struct amdgpu_device *adev = ddev->dev_private;
70 return snprintf(buf, PAGE_SIZE, "%llu\n",
71 amdgpu_gtt_mgr_usage(&adev->mman.bdev.man[TTM_PL_TT]));
74 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
75 amdgpu_mem_info_gtt_total_show, NULL);
76 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
77 amdgpu_mem_info_gtt_used_show, NULL);
80 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
82 * @man: TTM memory type manager
83 * @p_size: maximum size of GTT
85 * Allocate and initialize the GTT manager.
87 static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
90 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
91 struct amdgpu_gtt_mgr *mgr;
95 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
99 start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
100 size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
101 drm_mm_init(&mgr->mm, start, size);
102 spin_lock_init(&mgr->lock);
103 atomic64_set(&mgr->available, p_size);
106 ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_total);
108 DRM_ERROR("Failed to create device file mem_info_gtt_total\n");
111 ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_used);
113 DRM_ERROR("Failed to create device file mem_info_gtt_used\n");
121 * amdgpu_gtt_mgr_fini - free and destroy GTT manager
123 * @man: TTM memory type manager
125 * Destroy and free the GTT manager, returns -EBUSY if ranges are still
126 * allocated inside it.
128 static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man)
130 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
131 struct amdgpu_gtt_mgr *mgr = man->priv;
132 spin_lock(&mgr->lock);
133 drm_mm_takedown(&mgr->mm);
134 spin_unlock(&mgr->lock);
138 device_remove_file(adev->dev, &dev_attr_mem_info_gtt_total);
139 device_remove_file(adev->dev, &dev_attr_mem_info_gtt_used);
145 * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
147 * @mem: the mem object to check
149 * Check if a mem object has already address space allocated.
151 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_mem_reg *mem)
153 return mem->mm_node != NULL;
157 * amdgpu_gtt_mgr_new - allocate a new node
159 * @man: TTM memory type manager
160 * @tbo: TTM BO we need this range for
161 * @place: placement flags and restrictions
162 * @mem: the resulting mem object
164 * Dummy, allocate the node but no space for it yet.
166 static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
167 struct ttm_buffer_object *tbo,
168 const struct ttm_place *place,
169 struct ttm_mem_reg *mem)
171 struct amdgpu_gtt_mgr *mgr = man->priv;
172 struct amdgpu_gtt_node *node;
175 spin_lock(&mgr->lock);
176 if ((&tbo->mem == mem || tbo->mem.mem_type != TTM_PL_TT) &&
177 atomic64_read(&mgr->available) < mem->num_pages) {
178 spin_unlock(&mgr->lock);
181 atomic64_sub(mem->num_pages, &mgr->available);
182 spin_unlock(&mgr->lock);
186 mem->start = AMDGPU_BO_INVALID_OFFSET;
190 node = kzalloc(sizeof(*node), GFP_KERNEL);
198 spin_lock(&mgr->lock);
199 r = drm_mm_insert_node_in_range(&mgr->mm, &node->node, mem->num_pages,
200 mem->page_alignment, 0, place->fpfn,
201 place->lpfn, DRM_MM_INSERT_BEST);
202 spin_unlock(&mgr->lock);
208 mem->start = node->node.start;
216 atomic64_add(mem->num_pages, &mgr->available);
222 * amdgpu_gtt_mgr_del - free ranges
224 * @man: TTM memory type manager
225 * @mem: TTM memory object
227 * Free the allocated GTT again.
229 static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
230 struct ttm_mem_reg *mem)
232 struct amdgpu_gtt_mgr *mgr = man->priv;
233 struct amdgpu_gtt_node *node = mem->mm_node;
236 spin_lock(&mgr->lock);
237 drm_mm_remove_node(&node->node);
238 spin_unlock(&mgr->lock);
242 atomic64_add(mem->num_pages, &mgr->available);
246 * amdgpu_gtt_mgr_usage - return usage of GTT domain
248 * @man: TTM memory type manager
250 * Return how many bytes are used in the GTT domain
252 uint64_t amdgpu_gtt_mgr_usage(struct ttm_mem_type_manager *man)
254 struct amdgpu_gtt_mgr *mgr = man->priv;
255 s64 result = man->size - atomic64_read(&mgr->available);
257 return (result > 0 ? result : 0) * PAGE_SIZE;
260 int amdgpu_gtt_mgr_recover(struct ttm_mem_type_manager *man)
262 struct amdgpu_gtt_mgr *mgr = man->priv;
263 struct amdgpu_gtt_node *node;
264 struct drm_mm_node *mm_node;
267 spin_lock(&mgr->lock);
268 drm_mm_for_each_node(mm_node, &mgr->mm) {
269 node = container_of(mm_node, struct amdgpu_gtt_node, node);
270 r = amdgpu_ttm_recover_gart(node->tbo);
274 spin_unlock(&mgr->lock);
280 * amdgpu_gtt_mgr_debug - dump VRAM table
282 * @man: TTM memory type manager
283 * @printer: DRM printer to use
285 * Dump the table content using printk.
287 static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man,
288 struct drm_printer *printer)
290 struct amdgpu_gtt_mgr *mgr = man->priv;
292 spin_lock(&mgr->lock);
293 drm_mm_print(&mgr->mm, printer);
294 spin_unlock(&mgr->lock);
296 drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n",
297 man->size, (u64)atomic64_read(&mgr->available),
298 amdgpu_gtt_mgr_usage(man) >> 20);
301 const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = {
302 .init = amdgpu_gtt_mgr_init,
303 .takedown = amdgpu_gtt_mgr_fini,
304 .get_node = amdgpu_gtt_mgr_new,
305 .put_node = amdgpu_gtt_mgr_del,
306 .debug = amdgpu_gtt_mgr_debug