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_vram_mgr {
35 * DOC: mem_info_vram_total
37 * The amdgpu driver provides a sysfs API for reporting current total VRAM
38 * available on the device
39 * The file mem_info_vram_total is used for this and returns the total
40 * amount of VRAM in bytes
42 static ssize_t amdgpu_mem_info_vram_total_show(struct device *dev,
43 struct device_attribute *attr, char *buf)
45 struct drm_device *ddev = dev_get_drvdata(dev);
46 struct amdgpu_device *adev = ddev->dev_private;
48 return snprintf(buf, PAGE_SIZE, "%llu\n", adev->gmc.real_vram_size);
52 * DOC: mem_info_vis_vram_total
54 * The amdgpu driver provides a sysfs API for reporting current total
55 * visible VRAM available on the device
56 * The file mem_info_vis_vram_total is used for this and returns the total
57 * amount of visible VRAM in bytes
59 static ssize_t amdgpu_mem_info_vis_vram_total_show(struct device *dev,
60 struct device_attribute *attr, char *buf)
62 struct drm_device *ddev = dev_get_drvdata(dev);
63 struct amdgpu_device *adev = ddev->dev_private;
65 return snprintf(buf, PAGE_SIZE, "%llu\n", adev->gmc.visible_vram_size);
69 * DOC: mem_info_vram_used
71 * The amdgpu driver provides a sysfs API for reporting current total VRAM
72 * available on the device
73 * The file mem_info_vram_used is used for this and returns the total
74 * amount of currently used VRAM in bytes
76 static ssize_t amdgpu_mem_info_vram_used_show(struct device *dev,
77 struct device_attribute *attr, char *buf)
79 struct drm_device *ddev = dev_get_drvdata(dev);
80 struct amdgpu_device *adev = ddev->dev_private;
82 return snprintf(buf, PAGE_SIZE, "%llu\n",
83 amdgpu_vram_mgr_usage(&adev->mman.bdev.man[TTM_PL_VRAM]));
87 * DOC: mem_info_vis_vram_used
89 * The amdgpu driver provides a sysfs API for reporting current total of
91 * The file mem_info_vis_vram_used is used for this and returns the total
92 * amount of currently used visible VRAM in bytes
94 static ssize_t amdgpu_mem_info_vis_vram_used_show(struct device *dev,
95 struct device_attribute *attr, char *buf)
97 struct drm_device *ddev = dev_get_drvdata(dev);
98 struct amdgpu_device *adev = ddev->dev_private;
100 return snprintf(buf, PAGE_SIZE, "%llu\n",
101 amdgpu_vram_mgr_vis_usage(&adev->mman.bdev.man[TTM_PL_VRAM]));
104 static DEVICE_ATTR(mem_info_vram_total, S_IRUGO,
105 amdgpu_mem_info_vram_total_show, NULL);
106 static DEVICE_ATTR(mem_info_vis_vram_total, S_IRUGO,
107 amdgpu_mem_info_vis_vram_total_show,NULL);
108 static DEVICE_ATTR(mem_info_vram_used, S_IRUGO,
109 amdgpu_mem_info_vram_used_show, NULL);
110 static DEVICE_ATTR(mem_info_vis_vram_used, S_IRUGO,
111 amdgpu_mem_info_vis_vram_used_show, NULL);
114 * amdgpu_vram_mgr_init - init VRAM manager and DRM MM
116 * @man: TTM memory type manager
117 * @p_size: maximum size of VRAM
119 * Allocate and initialize the VRAM manager.
121 static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
122 unsigned long p_size)
124 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
125 struct amdgpu_vram_mgr *mgr;
128 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
132 drm_mm_init(&mgr->mm, 0, p_size);
133 spin_lock_init(&mgr->lock);
136 /* Add the two VRAM-related sysfs files */
137 ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_total);
139 DRM_ERROR("Failed to create device file mem_info_vram_total\n");
142 ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
144 DRM_ERROR("Failed to create device file mem_info_vis_vram_total\n");
147 ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_used);
149 DRM_ERROR("Failed to create device file mem_info_vram_used\n");
152 ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
154 DRM_ERROR("Failed to create device file mem_info_vis_vram_used\n");
162 * amdgpu_vram_mgr_fini - free and destroy VRAM manager
164 * @man: TTM memory type manager
166 * Destroy and free the VRAM manager, returns -EBUSY if ranges are still
167 * allocated inside it.
169 static int amdgpu_vram_mgr_fini(struct ttm_mem_type_manager *man)
171 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
172 struct amdgpu_vram_mgr *mgr = man->priv;
174 spin_lock(&mgr->lock);
175 drm_mm_takedown(&mgr->mm);
176 spin_unlock(&mgr->lock);
179 device_remove_file(adev->dev, &dev_attr_mem_info_vram_total);
180 device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
181 device_remove_file(adev->dev, &dev_attr_mem_info_vram_used);
182 device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
187 * amdgpu_vram_mgr_vis_size - Calculate visible node size
189 * @adev: amdgpu device structure
190 * @node: MM node structure
192 * Calculate how many bytes of the MM node are inside visible VRAM
194 static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev,
195 struct drm_mm_node *node)
197 uint64_t start = node->start << PAGE_SHIFT;
198 uint64_t end = (node->size + node->start) << PAGE_SHIFT;
200 if (start >= adev->gmc.visible_vram_size)
203 return (end > adev->gmc.visible_vram_size ?
204 adev->gmc.visible_vram_size : end) - start;
208 * amdgpu_vram_mgr_bo_visible_size - CPU visible BO size
210 * @bo: &amdgpu_bo buffer object (must be in VRAM)
213 * How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM.
215 u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo)
217 struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
218 struct ttm_mem_reg *mem = &bo->tbo.mem;
219 struct drm_mm_node *nodes = mem->mm_node;
220 unsigned pages = mem->num_pages;
223 if (amdgpu_gmc_vram_full_visible(&adev->gmc))
224 return amdgpu_bo_size(bo);
226 if (mem->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT)
229 for (usage = 0; nodes && pages; pages -= nodes->size, nodes++)
230 usage += amdgpu_vram_mgr_vis_size(adev, nodes);
236 * amdgpu_vram_mgr_virt_start - update virtual start address
238 * @mem: ttm_mem_reg to update
239 * @node: just allocated node
241 * Calculate a virtual BO start address to easily check if everything is CPU
244 static void amdgpu_vram_mgr_virt_start(struct ttm_mem_reg *mem,
245 struct drm_mm_node *node)
249 start = node->start + node->size;
250 if (start > mem->num_pages)
251 start -= mem->num_pages;
254 mem->start = max(mem->start, start);
258 * amdgpu_vram_mgr_new - allocate new ranges
260 * @man: TTM memory type manager
261 * @tbo: TTM BO we need this range for
262 * @place: placement flags and restrictions
263 * @mem: the resulting mem object
265 * Allocate VRAM for the given BO.
267 static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
268 struct ttm_buffer_object *tbo,
269 const struct ttm_place *place,
270 struct ttm_mem_reg *mem)
272 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
273 struct amdgpu_vram_mgr *mgr = man->priv;
274 struct drm_mm *mm = &mgr->mm;
275 struct drm_mm_node *nodes;
276 enum drm_mm_insert_mode mode;
277 unsigned long lpfn, num_nodes, pages_per_node, pages_left;
278 uint64_t vis_usage = 0, mem_bytes;
286 /* bail out quickly if there's likely not enough VRAM for this BO */
287 mem_bytes = (u64)mem->num_pages << PAGE_SHIFT;
288 if (atomic64_add_return(mem_bytes, &mgr->usage) > adev->gmc.mc_vram_size) {
289 atomic64_sub(mem_bytes, &mgr->usage);
294 if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
295 pages_per_node = ~0ul;
298 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
299 pages_per_node = HPAGE_PMD_NR;
302 pages_per_node = (2UL << (20UL - PAGE_SHIFT));
304 pages_per_node = max((uint32_t)pages_per_node, mem->page_alignment);
305 num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node);
308 nodes = kvmalloc_array((uint32_t)num_nodes, sizeof(*nodes),
309 GFP_KERNEL | __GFP_ZERO);
311 atomic64_sub(mem_bytes, &mgr->usage);
315 mode = DRM_MM_INSERT_BEST;
316 if (place->flags & TTM_PL_FLAG_TOPDOWN)
317 mode = DRM_MM_INSERT_HIGH;
320 pages_left = mem->num_pages;
322 spin_lock(&mgr->lock);
323 for (i = 0; pages_left >= pages_per_node; ++i) {
324 unsigned long pages = rounddown_pow_of_two(pages_left);
326 r = drm_mm_insert_node_in_range(mm, &nodes[i], pages,
333 vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
334 amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
338 for (; pages_left; ++i) {
339 unsigned long pages = min(pages_left, pages_per_node);
340 uint32_t alignment = mem->page_alignment;
342 if (pages == pages_per_node)
343 alignment = pages_per_node;
345 r = drm_mm_insert_node_in_range(mm, &nodes[i],
352 vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
353 amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
356 spin_unlock(&mgr->lock);
358 atomic64_add(vis_usage, &mgr->vis_usage);
360 mem->mm_node = nodes;
366 drm_mm_remove_node(&nodes[i]);
367 spin_unlock(&mgr->lock);
368 atomic64_sub(mem->num_pages << PAGE_SHIFT, &mgr->usage);
371 return r == -ENOSPC ? 0 : r;
375 * amdgpu_vram_mgr_del - free ranges
377 * @man: TTM memory type manager
378 * @tbo: TTM BO we need this range for
379 * @place: placement flags and restrictions
380 * @mem: TTM memory object
382 * Free the allocated VRAM again.
384 static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man,
385 struct ttm_mem_reg *mem)
387 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
388 struct amdgpu_vram_mgr *mgr = man->priv;
389 struct drm_mm_node *nodes = mem->mm_node;
390 uint64_t usage = 0, vis_usage = 0;
391 unsigned pages = mem->num_pages;
396 spin_lock(&mgr->lock);
398 pages -= nodes->size;
399 drm_mm_remove_node(nodes);
400 usage += nodes->size << PAGE_SHIFT;
401 vis_usage += amdgpu_vram_mgr_vis_size(adev, nodes);
404 spin_unlock(&mgr->lock);
406 atomic64_sub(usage, &mgr->usage);
407 atomic64_sub(vis_usage, &mgr->vis_usage);
409 kvfree(mem->mm_node);
414 * amdgpu_vram_mgr_usage - how many bytes are used in this domain
416 * @man: TTM memory type manager
418 * Returns how many bytes are used in this domain.
420 uint64_t amdgpu_vram_mgr_usage(struct ttm_mem_type_manager *man)
422 struct amdgpu_vram_mgr *mgr = man->priv;
424 return atomic64_read(&mgr->usage);
428 * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
430 * @man: TTM memory type manager
432 * Returns how many bytes are used in the visible part of VRAM
434 uint64_t amdgpu_vram_mgr_vis_usage(struct ttm_mem_type_manager *man)
436 struct amdgpu_vram_mgr *mgr = man->priv;
438 return atomic64_read(&mgr->vis_usage);
442 * amdgpu_vram_mgr_debug - dump VRAM table
444 * @man: TTM memory type manager
445 * @printer: DRM printer to use
447 * Dump the table content using printk.
449 static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man,
450 struct drm_printer *printer)
452 struct amdgpu_vram_mgr *mgr = man->priv;
454 spin_lock(&mgr->lock);
455 drm_mm_print(&mgr->mm, printer);
456 spin_unlock(&mgr->lock);
458 drm_printf(printer, "man size:%llu pages, ram usage:%lluMB, vis usage:%lluMB\n",
459 man->size, amdgpu_vram_mgr_usage(man) >> 20,
460 amdgpu_vram_mgr_vis_usage(man) >> 20);
463 const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = {
464 .init = amdgpu_vram_mgr_init,
465 .takedown = amdgpu_vram_mgr_fini,
466 .get_node = amdgpu_vram_mgr_new,
467 .put_node = amdgpu_vram_mgr_del,
468 .debug = amdgpu_vram_mgr_debug