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 struct amdgpu_gtt_node *node = mem->mm_node;
155 return (node->node.start != AMDGPU_BO_INVALID_OFFSET);
159 * amdgpu_gtt_mgr_alloc - allocate new ranges
161 * @man: TTM memory type manager
162 * @tbo: TTM BO we need this range for
163 * @place: placement flags and restrictions
164 * @mem: the resulting mem object
166 * Allocate the address space for a node.
168 static int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
169 struct ttm_buffer_object *tbo,
170 const struct ttm_place *place,
171 struct ttm_mem_reg *mem)
173 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
174 struct amdgpu_gtt_mgr *mgr = man->priv;
175 struct amdgpu_gtt_node *node = mem->mm_node;
176 enum drm_mm_insert_mode mode;
177 unsigned long fpfn, lpfn;
180 if (amdgpu_gtt_mgr_has_gart_addr(mem))
188 if (place && place->lpfn)
191 lpfn = adev->gart.num_cpu_pages;
193 mode = DRM_MM_INSERT_BEST;
194 if (place && place->flags & TTM_PL_FLAG_TOPDOWN)
195 mode = DRM_MM_INSERT_HIGH;
197 spin_lock(&mgr->lock);
198 r = drm_mm_insert_node_in_range(&mgr->mm, &node->node, mem->num_pages,
199 mem->page_alignment, 0, fpfn, lpfn,
201 spin_unlock(&mgr->lock);
204 mem->start = node->node.start;
210 * amdgpu_gtt_mgr_new - allocate a new node
212 * @man: TTM memory type manager
213 * @tbo: TTM BO we need this range for
214 * @place: placement flags and restrictions
215 * @mem: the resulting mem object
217 * Dummy, allocate the node but no space for it yet.
219 static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
220 struct ttm_buffer_object *tbo,
221 const struct ttm_place *place,
222 struct ttm_mem_reg *mem)
224 struct amdgpu_gtt_mgr *mgr = man->priv;
225 struct amdgpu_gtt_node *node;
228 spin_lock(&mgr->lock);
229 if ((&tbo->mem == mem || tbo->mem.mem_type != TTM_PL_TT) &&
230 atomic64_read(&mgr->available) < mem->num_pages) {
231 spin_unlock(&mgr->lock);
234 atomic64_sub(mem->num_pages, &mgr->available);
235 spin_unlock(&mgr->lock);
237 node = kzalloc(sizeof(*node), GFP_KERNEL);
243 node->node.start = AMDGPU_BO_INVALID_OFFSET;
244 node->node.size = mem->num_pages;
248 if (place->fpfn || place->lpfn || place->flags & TTM_PL_FLAG_TOPDOWN) {
249 r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem);
257 mem->start = node->node.start;
262 atomic64_add(mem->num_pages, &mgr->available);
268 * amdgpu_gtt_mgr_del - free ranges
270 * @man: TTM memory type manager
271 * @mem: TTM memory object
273 * Free the allocated GTT again.
275 static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
276 struct ttm_mem_reg *mem)
278 struct amdgpu_gtt_mgr *mgr = man->priv;
279 struct amdgpu_gtt_node *node = mem->mm_node;
284 spin_lock(&mgr->lock);
285 if (node->node.start != AMDGPU_BO_INVALID_OFFSET)
286 drm_mm_remove_node(&node->node);
287 spin_unlock(&mgr->lock);
288 atomic64_add(mem->num_pages, &mgr->available);
295 * amdgpu_gtt_mgr_usage - return usage of GTT domain
297 * @man: TTM memory type manager
299 * Return how many bytes are used in the GTT domain
301 uint64_t amdgpu_gtt_mgr_usage(struct ttm_mem_type_manager *man)
303 struct amdgpu_gtt_mgr *mgr = man->priv;
304 s64 result = man->size - atomic64_read(&mgr->available);
306 return (result > 0 ? result : 0) * PAGE_SIZE;
309 int amdgpu_gtt_mgr_recover(struct ttm_mem_type_manager *man)
311 struct amdgpu_gtt_mgr *mgr = man->priv;
312 struct amdgpu_gtt_node *node;
313 struct drm_mm_node *mm_node;
316 spin_lock(&mgr->lock);
317 drm_mm_for_each_node(mm_node, &mgr->mm) {
318 node = container_of(mm_node, struct amdgpu_gtt_node, node);
319 r = amdgpu_ttm_recover_gart(node->tbo);
323 spin_unlock(&mgr->lock);
329 * amdgpu_gtt_mgr_debug - dump VRAM table
331 * @man: TTM memory type manager
332 * @printer: DRM printer to use
334 * Dump the table content using printk.
336 static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man,
337 struct drm_printer *printer)
339 struct amdgpu_gtt_mgr *mgr = man->priv;
341 spin_lock(&mgr->lock);
342 drm_mm_print(&mgr->mm, printer);
343 spin_unlock(&mgr->lock);
345 drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n",
346 man->size, (u64)atomic64_read(&mgr->available),
347 amdgpu_gtt_mgr_usage(man) >> 20);
350 const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = {
351 .init = amdgpu_gtt_mgr_init,
352 .takedown = amdgpu_gtt_mgr_fini,
353 .get_node = amdgpu_gtt_mgr_new,
354 .put_node = amdgpu_gtt_mgr_del,
355 .debug = amdgpu_gtt_mgr_debug