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1/*
2 * Copyright (C) 2015 Etnaviv Project
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published by
6 * the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include "common.xml.h"
18#include "etnaviv_cmdbuf.h"
19#include "etnaviv_drv.h"
20#include "etnaviv_gem.h"
21#include "etnaviv_gpu.h"
22#include "etnaviv_iommu.h"
23#include "etnaviv_mmu.h"
24
25static void etnaviv_domain_unmap(struct etnaviv_iommu_domain *domain,
26 unsigned long iova, size_t size)
27{
28 size_t unmapped_page, unmapped = 0;
29 size_t pgsize = SZ_4K;
30
31 if (!IS_ALIGNED(iova | size, pgsize)) {
32 pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%zx\n",
33 iova, size, pgsize);
34 return;
35 }
36
37 while (unmapped < size) {
38 unmapped_page = domain->ops->unmap(domain, iova, pgsize);
39 if (!unmapped_page)
40 break;
41
42 iova += unmapped_page;
43 unmapped += unmapped_page;
44 }
45}
46
47static int etnaviv_domain_map(struct etnaviv_iommu_domain *domain,
48 unsigned long iova, phys_addr_t paddr,
49 size_t size, int prot)
50{
51 unsigned long orig_iova = iova;
52 size_t pgsize = SZ_4K;
53 size_t orig_size = size;
54 int ret = 0;
55
56 if (!IS_ALIGNED(iova | paddr | size, pgsize)) {
57 pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%zx\n",
58 iova, &paddr, size, pgsize);
59 return -EINVAL;
60 }
61
62 while (size) {
63 ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
64 if (ret)
65 break;
66
67 iova += pgsize;
68 paddr += pgsize;
69 size -= pgsize;
70 }
71
72 /* unroll mapping in case something went wrong */
73 if (ret)
74 etnaviv_domain_unmap(domain, orig_iova, orig_size - size);
75
76 return ret;
77}
78
79static int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
80 struct sg_table *sgt, unsigned len, int prot)
81{
82 struct etnaviv_iommu_domain *domain = iommu->domain;
83 struct scatterlist *sg;
84 unsigned int da = iova;
85 unsigned int i, j;
86 int ret;
87
88 if (!domain || !sgt)
89 return -EINVAL;
90
91 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
92 u32 pa = sg_dma_address(sg) - sg->offset;
93 size_t bytes = sg_dma_len(sg) + sg->offset;
94
95 VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);
96
97 ret = etnaviv_domain_map(domain, da, pa, bytes, prot);
98 if (ret)
99 goto fail;
100
101 da += bytes;
102 }
103
104 return 0;
105
106fail:
107 da = iova;
108
109 for_each_sg(sgt->sgl, sg, i, j) {
110 size_t bytes = sg_dma_len(sg) + sg->offset;
111
112 etnaviv_domain_unmap(domain, da, bytes);
113 da += bytes;
114 }
115 return ret;
116}
117
118static void etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
119 struct sg_table *sgt, unsigned len)
120{
121 struct etnaviv_iommu_domain *domain = iommu->domain;
122 struct scatterlist *sg;
123 unsigned int da = iova;
124 int i;
125
126 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
127 size_t bytes = sg_dma_len(sg) + sg->offset;
128
129 etnaviv_domain_unmap(domain, da, bytes);
130
131 VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
132
133 BUG_ON(!PAGE_ALIGNED(bytes));
134
135 da += bytes;
136 }
137}
138
139static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
140 struct etnaviv_vram_mapping *mapping)
141{
142 struct etnaviv_gem_object *etnaviv_obj = mapping->object;
143
144 etnaviv_iommu_unmap(mmu, mapping->vram_node.start,
145 etnaviv_obj->sgt, etnaviv_obj->base.size);
146 drm_mm_remove_node(&mapping->vram_node);
147}
148
149static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
150 struct drm_mm_node *node, size_t size)
151{
152 struct etnaviv_vram_mapping *free = NULL;
153 enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
154 int ret;
155
156 lockdep_assert_held(&mmu->lock);
157
158 while (1) {
159 struct etnaviv_vram_mapping *m, *n;
160 struct drm_mm_scan scan;
161 struct list_head list;
162 bool found;
163
164 ret = drm_mm_insert_node_in_range(&mmu->mm, node,
165 size, 0, 0,
166 mmu->last_iova, U64_MAX,
167 mode);
168 if (ret != -ENOSPC)
169 break;
170
171 /*
172 * If we did not search from the start of the MMU region,
173 * try again in case there are free slots.
174 */
175 if (mmu->last_iova) {
176 mmu->last_iova = 0;
177 mmu->need_flush = true;
178 continue;
179 }
180
181 /* Try to retire some entries */
182 drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0, mode);
183
184 found = 0;
185 INIT_LIST_HEAD(&list);
186 list_for_each_entry(free, &mmu->mappings, mmu_node) {
187 /* If this vram node has not been used, skip this. */
188 if (!free->vram_node.mm)
189 continue;
190
191 /*
192 * If the iova is pinned, then it's in-use,
193 * so we must keep its mapping.
194 */
195 if (free->use)
196 continue;
197
198 list_add(&free->scan_node, &list);
199 if (drm_mm_scan_add_block(&scan, &free->vram_node)) {
200 found = true;
201 break;
202 }
203 }
204
205 if (!found) {
206 /* Nothing found, clean up and fail */
207 list_for_each_entry_safe(m, n, &list, scan_node)
208 BUG_ON(drm_mm_scan_remove_block(&scan, &m->vram_node));
209 break;
210 }
211
212 /*
213 * drm_mm does not allow any other operations while
214 * scanning, so we have to remove all blocks first.
215 * If drm_mm_scan_remove_block() returns false, we
216 * can leave the block pinned.
217 */
218 list_for_each_entry_safe(m, n, &list, scan_node)
219 if (!drm_mm_scan_remove_block(&scan, &m->vram_node))
220 list_del_init(&m->scan_node);
221
222 /*
223 * Unmap the blocks which need to be reaped from the MMU.
224 * Clear the mmu pointer to prevent the mapping_get finding
225 * this mapping.
226 */
227 list_for_each_entry_safe(m, n, &list, scan_node) {
228 etnaviv_iommu_remove_mapping(mmu, m);
229 m->mmu = NULL;
230 list_del_init(&m->mmu_node);
231 list_del_init(&m->scan_node);
232 }
233
234 mode = DRM_MM_INSERT_EVICT;
235
236 /*
237 * We removed enough mappings so that the new allocation will
238 * succeed, retry the allocation one more time.
239 */
240 }
241
242 return ret;
243}
244
245int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
246 struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
247 struct etnaviv_vram_mapping *mapping)
248{
249 struct sg_table *sgt = etnaviv_obj->sgt;
250 struct drm_mm_node *node;
251 int ret;
252
253 lockdep_assert_held(&etnaviv_obj->lock);
254
255 mutex_lock(&mmu->lock);
256
257 /* v1 MMU can optimize single entry (contiguous) scatterlists */
258 if (mmu->version == ETNAVIV_IOMMU_V1 &&
259 sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
260 u32 iova;
261
262 iova = sg_dma_address(sgt->sgl) - memory_base;
263 if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
264 mapping->iova = iova;
265 list_add_tail(&mapping->mmu_node, &mmu->mappings);
266 ret = 0;
267 goto unlock;
268 }
269 }
270
271 node = &mapping->vram_node;
272
273 ret = etnaviv_iommu_find_iova(mmu, node, etnaviv_obj->base.size);
274 if (ret < 0)
275 goto unlock;
276
277 mmu->last_iova = node->start + etnaviv_obj->base.size;
278 mapping->iova = node->start;
279 ret = etnaviv_iommu_map(mmu, node->start, sgt, etnaviv_obj->base.size,
280 ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE);
281
282 if (ret < 0) {
283 drm_mm_remove_node(node);
284 goto unlock;
285 }
286
287 list_add_tail(&mapping->mmu_node, &mmu->mappings);
288 mmu->need_flush = true;
289unlock:
290 mutex_unlock(&mmu->lock);
291
292 return ret;
293}
294
295void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu,
296 struct etnaviv_vram_mapping *mapping)
297{
298 WARN_ON(mapping->use);
299
300 mutex_lock(&mmu->lock);
301
302 /* If the vram node is on the mm, unmap and remove the node */
303 if (mapping->vram_node.mm == &mmu->mm)
304 etnaviv_iommu_remove_mapping(mmu, mapping);
305
306 list_del(&mapping->mmu_node);
307 mmu->need_flush = true;
308 mutex_unlock(&mmu->lock);
309}
310
311void etnaviv_iommu_destroy(struct etnaviv_iommu *mmu)
312{
313 drm_mm_takedown(&mmu->mm);
314 mmu->domain->ops->free(mmu->domain);
315 kfree(mmu);
316}
317
318struct etnaviv_iommu *etnaviv_iommu_new(struct etnaviv_gpu *gpu)
319{
320 enum etnaviv_iommu_version version;
321 struct etnaviv_iommu *mmu;
322
323 mmu = kzalloc(sizeof(*mmu), GFP_KERNEL);
324 if (!mmu)
325 return ERR_PTR(-ENOMEM);
326
327 if (!(gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION)) {
328 mmu->domain = etnaviv_iommuv1_domain_alloc(gpu);
329 version = ETNAVIV_IOMMU_V1;
330 } else {
331 mmu->domain = etnaviv_iommuv2_domain_alloc(gpu);
332 version = ETNAVIV_IOMMU_V2;
333 }
334
335 if (!mmu->domain) {
336 dev_err(gpu->dev, "Failed to allocate GPU IOMMU domain\n");
337 kfree(mmu);
338 return ERR_PTR(-ENOMEM);
339 }
340
341 mmu->gpu = gpu;
342 mmu->version = version;
343 mutex_init(&mmu->lock);
344 INIT_LIST_HEAD(&mmu->mappings);
345
346 drm_mm_init(&mmu->mm, mmu->domain->base, mmu->domain->size);
347
348 return mmu;
349}
350
351void etnaviv_iommu_restore(struct etnaviv_gpu *gpu)
352{
353 if (gpu->mmu->version == ETNAVIV_IOMMU_V1)
354 etnaviv_iommuv1_restore(gpu);
355 else
356 etnaviv_iommuv2_restore(gpu);
357}
358
359int etnaviv_iommu_get_suballoc_va(struct etnaviv_gpu *gpu, dma_addr_t paddr,
360 struct drm_mm_node *vram_node, size_t size,
361 u32 *iova)
362{
363 struct etnaviv_iommu *mmu = gpu->mmu;
364
365 if (mmu->version == ETNAVIV_IOMMU_V1) {
366 *iova = paddr - gpu->memory_base;
367 return 0;
368 } else {
369 int ret;
370
371 mutex_lock(&mmu->lock);
372 ret = etnaviv_iommu_find_iova(mmu, vram_node, size);
373 if (ret < 0) {
374 mutex_unlock(&mmu->lock);
375 return ret;
376 }
377 ret = etnaviv_domain_map(mmu->domain, vram_node->start, paddr,
378 size, ETNAVIV_PROT_READ);
379 if (ret < 0) {
380 drm_mm_remove_node(vram_node);
381 mutex_unlock(&mmu->lock);
382 return ret;
383 }
384 mmu->last_iova = vram_node->start + size;
385 gpu->mmu->need_flush = true;
386 mutex_unlock(&mmu->lock);
387
388 *iova = (u32)vram_node->start;
389 return 0;
390 }
391}
392
393void etnaviv_iommu_put_suballoc_va(struct etnaviv_gpu *gpu,
394 struct drm_mm_node *vram_node, size_t size,
395 u32 iova)
396{
397 struct etnaviv_iommu *mmu = gpu->mmu;
398
399 if (mmu->version == ETNAVIV_IOMMU_V2) {
400 mutex_lock(&mmu->lock);
401 etnaviv_domain_unmap(mmu->domain, iova, size);
402 drm_mm_remove_node(vram_node);
403 mutex_unlock(&mmu->lock);
404 }
405}
406size_t etnaviv_iommu_dump_size(struct etnaviv_iommu *iommu)
407{
408 return iommu->domain->ops->dump_size(iommu->domain);
409}
410
411void etnaviv_iommu_dump(struct etnaviv_iommu *iommu, void *buf)
412{
413 iommu->domain->ops->dump(iommu->domain, buf);
414}