1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015-2018 Etnaviv Project
*/
#include "common.xml.h"
#include "etnaviv_cmdbuf.h"
#include "etnaviv_drv.h"
#include "etnaviv_gem.h"
#include "etnaviv_gpu.h"
#include "etnaviv_iommu.h"
#include "etnaviv_mmu.h"
static void etnaviv_domain_unmap(struct etnaviv_iommu_domain *domain,
unsigned long iova, size_t size)
{
size_t unmapped_page, unmapped = 0;
size_t pgsize = SZ_4K;
if (!IS_ALIGNED(iova | size, pgsize)) {
pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%zx\n",
iova, size, pgsize);
return;
}
while (unmapped < size) {
unmapped_page = domain->ops->unmap(domain, iova, pgsize);
if (!unmapped_page)
break;
iova += unmapped_page;
unmapped += unmapped_page;
}
}
static int etnaviv_domain_map(struct etnaviv_iommu_domain *domain,
unsigned long iova, phys_addr_t paddr,
size_t size, int prot)
{
unsigned long orig_iova = iova;
size_t pgsize = SZ_4K;
size_t orig_size = size;
int ret = 0;
if (!IS_ALIGNED(iova | paddr | size, pgsize)) {
pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%zx\n",
iova, &paddr, size, pgsize);
return -EINVAL;
}
while (size) {
ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
if (ret)
break;
iova += pgsize;
paddr += pgsize;
size -= pgsize;
}
/* unroll mapping in case something went wrong */
if (ret)
etnaviv_domain_unmap(domain, orig_iova, orig_size - size);
return ret;
}
static int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
struct sg_table *sgt, unsigned len, int prot)
{
struct etnaviv_iommu_domain *domain = iommu->domain;
struct scatterlist *sg;
unsigned int da = iova;
unsigned int i, j;
int ret;
if (!domain || !sgt)
return -EINVAL;
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
u32 pa = sg_dma_address(sg) - sg->offset;
size_t bytes = sg_dma_len(sg) + sg->offset;
VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);
ret = etnaviv_domain_map(domain, da, pa, bytes, prot);
if (ret)
goto fail;
da += bytes;
}
return 0;
fail:
da = iova;
for_each_sg(sgt->sgl, sg, i, j) {
size_t bytes = sg_dma_len(sg) + sg->offset;
etnaviv_domain_unmap(domain, da, bytes);
da += bytes;
}
return ret;
}
static void etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
struct sg_table *sgt, unsigned len)
{
struct etnaviv_iommu_domain *domain = iommu->domain;
struct scatterlist *sg;
unsigned int da = iova;
int i;
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
size_t bytes = sg_dma_len(sg) + sg->offset;
etnaviv_domain_unmap(domain, da, bytes);
VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
BUG_ON(!PAGE_ALIGNED(bytes));
da += bytes;
}
}
static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
struct etnaviv_vram_mapping *mapping)
{
struct etnaviv_gem_object *etnaviv_obj = mapping->object;
etnaviv_iommu_unmap(mmu, mapping->vram_node.start,
etnaviv_obj->sgt, etnaviv_obj->base.size);
drm_mm_remove_node(&mapping->vram_node);
}
static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
struct drm_mm_node *node, size_t size)
{
struct etnaviv_vram_mapping *free = NULL;
enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
int ret;
lockdep_assert_held(&mmu->lock);
while (1) {
struct etnaviv_vram_mapping *m, *n;
struct drm_mm_scan scan;
struct list_head list;
bool found;
ret = drm_mm_insert_node_in_range(&mmu->mm, node,
size, 0, 0, 0, U64_MAX, mode);
if (ret != -ENOSPC)
break;
/* Try to retire some entries */
drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0, mode);
found = 0;
INIT_LIST_HEAD(&list);
list_for_each_entry(free, &mmu->mappings, mmu_node) {
/* If this vram node has not been used, skip this. */
if (!free->vram_node.mm)
continue;
/*
* If the iova is pinned, then it's in-use,
* so we must keep its mapping.
*/
if (free->use)
continue;
list_add(&free->scan_node, &list);
if (drm_mm_scan_add_block(&scan, &free->vram_node)) {
found = true;
break;
}
}
if (!found) {
/* Nothing found, clean up and fail */
list_for_each_entry_safe(m, n, &list, scan_node)
BUG_ON(drm_mm_scan_remove_block(&scan, &m->vram_node));
break;
}
/*
* drm_mm does not allow any other operations while
* scanning, so we have to remove all blocks first.
* If drm_mm_scan_remove_block() returns false, we
* can leave the block pinned.
*/
list_for_each_entry_safe(m, n, &list, scan_node)
if (!drm_mm_scan_remove_block(&scan, &m->vram_node))
list_del_init(&m->scan_node);
/*
* Unmap the blocks which need to be reaped from the MMU.
* Clear the mmu pointer to prevent the mapping_get finding
* this mapping.
*/
list_for_each_entry_safe(m, n, &list, scan_node) {
etnaviv_iommu_remove_mapping(mmu, m);
m->mmu = NULL;
list_del_init(&m->mmu_node);
list_del_init(&m->scan_node);
}
mode = DRM_MM_INSERT_EVICT;
/*
* We removed enough mappings so that the new allocation will
* succeed, retry the allocation one more time.
*/
}
return ret;
}
int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
struct etnaviv_vram_mapping *mapping)
{
struct sg_table *sgt = etnaviv_obj->sgt;
struct drm_mm_node *node;
int ret;
lockdep_assert_held(&etnaviv_obj->lock);
mutex_lock(&mmu->lock);
/* v1 MMU can optimize single entry (contiguous) scatterlists */
if (mmu->version == ETNAVIV_IOMMU_V1 &&
sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
u32 iova;
iova = sg_dma_address(sgt->sgl) - memory_base;
if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
mapping->iova = iova;
list_add_tail(&mapping->mmu_node, &mmu->mappings);
ret = 0;
goto unlock;
}
}
node = &mapping->vram_node;
ret = etnaviv_iommu_find_iova(mmu, node, etnaviv_obj->base.size);
if (ret < 0)
goto unlock;
mapping->iova = node->start;
ret = etnaviv_iommu_map(mmu,
|