1/*
  2 * Copyright 2016 Advanced Micro Devices, Inc.
  3 *
  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:
 10 *
 11 * The above copyright notice and this permission notice shall be included in
 12 * all copies or substantial portions of the Software.
 13 *
 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.
 21 *
 22 * Authors: Christian König
 23 */
 24
 25#include <drm/ttm/ttm_range_manager.h>
 26
 27#include "amdgpu.h"
 28
 29struct amdgpu_gtt_node {
 30	struct ttm_buffer_object *tbo;
 31	struct ttm_range_mgr_node base;
 32};
 33
 34static inline struct amdgpu_gtt_mgr *
 35to_gtt_mgr(struct ttm_resource_manager *man)
 36{
 37	return container_of(man, struct amdgpu_gtt_mgr, manager);
 38}
 39
 40static inline struct amdgpu_gtt_node *
 41to_amdgpu_gtt_node(struct ttm_resource *res)
 42{
 43	return container_of(res, struct amdgpu_gtt_node, base.base);
 44}
 45
 46/**
 47 * DOC: mem_info_gtt_total
 48 *
 49 * The amdgpu driver provides a sysfs API for reporting current total size of
 50 * the GTT.
 51 * The file mem_info_gtt_total is used for this, and returns the total size of
 52 * the GTT block, in bytes
 53 */
 54static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev,
 55					      struct device_attribute *attr,
 56					      char *buf)
 57{
 58	struct drm_device *ddev = dev_get_drvdata(dev);
 59	struct amdgpu_device *adev = drm_to_adev(ddev);
 60	struct ttm_resource_manager *man;
 61
 62	man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
 63	return sysfs_emit(buf, "%llu\n", man->size * PAGE_SIZE);
 64}
 65
 66/**
 67 * DOC: mem_info_gtt_used
 68 *
 69 * The amdgpu driver provides a sysfs API for reporting current total amount of
 70 * used GTT.
 71 * The file mem_info_gtt_used is used for this, and returns the current used
 72 * size of the GTT block, in bytes
 73 */
 74static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev,
 75					     struct device_attribute *attr,
 76					     char *buf)
 77{
 78	struct drm_device *ddev = dev_get_drvdata(dev);
 79	struct amdgpu_device *adev = drm_to_adev(ddev);
 80	struct ttm_resource_manager *man;
 81
 82	man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
 83	return sysfs_emit(buf, "%llu\n", amdgpu_gtt_mgr_usage(man));
 84}
 85
 86static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
 87	           amdgpu_mem_info_gtt_total_show, NULL);
 88static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
 89	           amdgpu_mem_info_gtt_used_show, NULL);
 90
 91static struct attribute *amdgpu_gtt_mgr_attributes[] = {
 92	&dev_attr_mem_info_gtt_total.attr,
 93	&dev_attr_mem_info_gtt_used.attr,
 94	NULL
 95};
 96
 97const struct attribute_group amdgpu_gtt_mgr_attr_group = {
 98	.attrs = amdgpu_gtt_mgr_attributes
 99};
100
101/**
102 * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
103 *
104 * @res: the mem object to check
105 *
106 * Check if a mem object has already address space allocated.
107 */
108bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *res)
109{
110	struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res);
111
112	return drm_mm_node_allocated(&node->base.mm_nodes[0]);
113}
114
115/**
116 * amdgpu_gtt_mgr_new - allocate a new node
117 *
118 * @man: TTM memory type manager
119 * @tbo: TTM BO we need this range for
120 * @place: placement flags and restrictions
121 * @mem: the resulting mem object
122 *
123 * Dummy, allocate the node but no space for it yet.
124 */
125static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
126			      struct ttm_buffer_object *tbo,
127			      const struct ttm_place *place,
128			      struct ttm_resource **res)
129{
130	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
131	uint32_t num_pages = PFN_UP(tbo->base.size);
132	struct amdgpu_gtt_node *node;
133	int r;
134
135	spin_lock(&mgr->lock);
136	if (tbo->resource && tbo->resource->mem_type != TTM_PL_TT &&
137	    atomic64_read(&mgr->available) < num_pages) {
138		spin_unlock(&mgr->lock);
139		return -ENOSPC;
140	}
141	atomic64_sub(num_pages, &mgr->available);
142	spin_unlock(&mgr->lock);
143
144	node = kzalloc(struct_size(node, base.mm_nodes, 1), GFP_KERNEL);
145	if (!node) {
146		r = -ENOMEM;
147		goto err_out;
148	}
149
150	node->tbo = tbo;
151	ttm_resource_init(tbo, place, &node->base.base);
152
153	if (place->lpfn) {
154		spin_lock(&mgr->lock);
155		r = drm_mm_insert_node_in_range(&mgr->mm,
156						&node->base.mm_nodes[0],
157						num_pages, tbo->page_alignment,
158						0, place->fpfn, place->lpfn,
159						DRM_MM_INSERT_BEST);
160		spin_unlock(&mgr->lock);
161		if (unlikely(r))
162			goto err_free;
163
164		node->base.base.start = node->base.mm_nodes[0].start;
165	} else {
166		node->base.mm_nodes[0].start = 0;
167		node->base.mm_nodes[0].size = node->base.base.num_pages;
168		node->base.base.start = AMDGPU_BO_INVALID_OFFSET;
169	}
170
171	*res = &node->base.base;
172	return 0;
173
174err_free:
175	kfree(node);
176
177err_out:
178	atomic64_add(num_pages, &mgr->available);
179
180	return r;
181}
182
183/**
184 * amdgpu_gtt_mgr_del - free ranges
185 *
186 * @man: TTM memory type manager
187 * @mem: TTM memory object
188 *
189 * Free the allocated GTT again.
190 */
191static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
192			       struct ttm_resource *res)
193{
194	struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res);
195	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
196
197	spin_lock(&mgr->lock);
198	if (drm_mm_node_allocated(&node->base.mm_nodes[0]))
199		drm_mm_remove_node(&node->base.mm_nodes[0]);
200	spin_unlock(&mgr->lock);
201	atomic64_add(res->num_pages, &mgr->available);
202
203	kfree(node);
204}
205
206/**
207 * amdgpu_gtt_mgr_usage - return usage of GTT domain
208 *
209 * @man: TTM memory type manager
210 *
211 * Return how many bytes are used in the GTT domain
212 */
213uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man)
214{
215	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
216	s64 result = man->size - atomic64_read(&mgr->available);
217
218	return (result > 0 ? result : 0) * PAGE_SIZE;
219}
220
221/**
222 * amdgpu_gtt_mgr_recover - re-init gart
223 *
224 * @man: TTM memory type manager
225 *
226 * Re-init the gart for each known BO in the GTT.
227 */
228int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man)
229{
230	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
231	struct amdgpu_device *adev;
232	struct amdgpu_gtt_node *node;
233	struct drm_mm_node *mm_node;
234	int r = 0;
235
236	adev = container_of(mgr, typeof(*adev), mman.gtt_mgr);
237	spin_lock(&mgr->lock);
238	drm_mm_for_each_node(mm_node, &mgr->mm) {
239		node = container_of(mm_node, typeof(*node), base.mm_nodes[0]);
240		r = amdgpu_ttm_recover_gart(node->tbo);
241		if (r)
242			break;
243	}
244	spin_unlock(&mgr->lock);
245
246	amdgpu_gart_invalidate_tlb(adev);
247
248	return r;
249}
250
251/**
252 * amdgpu_gtt_mgr_debug - dump VRAM table
253 *
254 * @man: TTM memory type manager
255 * @printer: DRM printer to use
256 *
257 * Dump the table content using printk.
258 */
259static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man,
260				 struct drm_printer *printer)
261{
262	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
263
264	spin_lock(&mgr->lock);
265	drm_mm_print(&mgr->mm, printer);
266	spin_unlock(&mgr->lock);
267
268	drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n",
269		   man->size, (u64)atomic64_read(&mgr->available),
270		   amdgpu_gtt_mgr_usage(man) >> 20);
271}
272
273static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
274	.alloc = amdgpu_gtt_mgr_new,
275	.free = amdgpu_gtt_mgr_del,
276	.debug = amdgpu_gtt_mgr_debug
277};
278
279/**
280 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
281 *
282 * @adev: amdgpu_device pointer
283 * @gtt_size: maximum size of GTT
284 *
285 * Allocate and initialize the GTT manager.
286 */
287int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
288{
289	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
290	struct ttm_resource_manager *man = &mgr->manager;
291	uint64_t start, size;
292
293	man->use_tt = true;
294	man->func = &amdgpu_gtt_mgr_func;
295
296	ttm_resource_manager_init(man, gtt_size >> PAGE_SHIFT);
297
298	start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
299	size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
300	drm_mm_init(&mgr->mm, start, size);
301	spin_lock_init(&mgr->lock);
302	atomic64_set(&mgr->available, gtt_size >> PAGE_SHIFT);
303
304	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager);
305	ttm_resource_manager_set_used(man, true);
306	return 0;
307}
308
309/**
310 * amdgpu_gtt_mgr_fini - free and destroy GTT manager
311 *
312 * @adev: amdgpu_device pointer
313 *
314 * Destroy and free the GTT manager, returns -EBUSY if ranges are still
315 * allocated inside it.
316 */
317void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev)
318{
319	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
320	struct ttm_resource_manager *man = &mgr->manager;
321	int ret;
322
323	ttm_resource_manager_set_used(man, false);
324
325	ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
326	if (ret)
327		return;
328
329	spin_lock(&mgr->lock);
330	drm_mm_takedown(&mgr->mm);
331	spin_unlock(&mgr->lock);
332
333	ttm_resource_manager_cleanup(man);
334	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL);
335}