diff options
Diffstat (limited to 'drivers/gpu/nvgpu/gk20a/semaphore_gk20a.c')
-rw-r--r-- | drivers/gpu/nvgpu/gk20a/semaphore_gk20a.c | 466 |
1 files changed, 0 insertions, 466 deletions
diff --git a/drivers/gpu/nvgpu/gk20a/semaphore_gk20a.c b/drivers/gpu/nvgpu/gk20a/semaphore_gk20a.c deleted file mode 100644 index 2038e300..00000000 --- a/drivers/gpu/nvgpu/gk20a/semaphore_gk20a.c +++ /dev/null | |||
@@ -1,466 +0,0 @@ | |||
1 | /* | ||
2 | * drivers/video/tegra/host/gk20a/semaphore_gk20a.c | ||
3 | * | ||
4 | * GK20A Semaphores | ||
5 | * | ||
6 | * Copyright (c) 2014-2016, NVIDIA CORPORATION. All rights reserved. | ||
7 | * | ||
8 | * This program is free software; you can redistribute it and/or modify it | ||
9 | * under the terms and conditions of the GNU General Public License, | ||
10 | * version 2, as published by the Free Software Foundation. | ||
11 | * | ||
12 | * This program is distributed in the hope it will be useful, but WITHOUT | ||
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
15 | * more details. | ||
16 | */ | ||
17 | |||
18 | #define pr_fmt(fmt) "gpu_sema: " fmt | ||
19 | |||
20 | #include <linux/dma-mapping.h> | ||
21 | #include <linux/highmem.h> | ||
22 | #include <linux/slab.h> | ||
23 | |||
24 | #include <asm/pgtable.h> | ||
25 | |||
26 | #include "gk20a.h" | ||
27 | #include "mm_gk20a.h" | ||
28 | #include "semaphore_gk20a.h" | ||
29 | |||
30 | #define __lock_sema_sea(s) \ | ||
31 | do { \ | ||
32 | gpu_sema_verbose_dbg("Acquiring sema lock..."); \ | ||
33 | mutex_lock(&s->sea_lock); \ | ||
34 | gpu_sema_verbose_dbg("Sema lock aquried!"); \ | ||
35 | } while (0) | ||
36 | |||
37 | #define __unlock_sema_sea(s) \ | ||
38 | do { \ | ||
39 | mutex_unlock(&s->sea_lock); \ | ||
40 | gpu_sema_verbose_dbg("Released sema lock"); \ | ||
41 | } while (0) | ||
42 | |||
43 | /* | ||
44 | * Return the sema_sea pointer. | ||
45 | */ | ||
46 | struct gk20a_semaphore_sea *gk20a_semaphore_get_sea(struct gk20a *g) | ||
47 | { | ||
48 | return g->sema_sea; | ||
49 | } | ||
50 | |||
51 | static int __gk20a_semaphore_sea_grow(struct gk20a_semaphore_sea *sea) | ||
52 | { | ||
53 | int ret = 0; | ||
54 | struct gk20a *gk20a = sea->gk20a; | ||
55 | |||
56 | __lock_sema_sea(sea); | ||
57 | |||
58 | ret = gk20a_gmmu_alloc_attr_sys(gk20a, DMA_ATTR_NO_KERNEL_MAPPING, | ||
59 | PAGE_SIZE * SEMAPHORE_POOL_COUNT, | ||
60 | &sea->sea_mem); | ||
61 | if (ret) | ||
62 | goto out; | ||
63 | |||
64 | sea->ro_sg_table = sea->sea_mem.sgt; | ||
65 | sea->size = SEMAPHORE_POOL_COUNT; | ||
66 | sea->map_size = SEMAPHORE_POOL_COUNT * PAGE_SIZE; | ||
67 | |||
68 | out: | ||
69 | __unlock_sema_sea(sea); | ||
70 | return ret; | ||
71 | } | ||
72 | |||
73 | /* | ||
74 | * Create the semaphore sea. Only create it once - subsequent calls to this will | ||
75 | * return the originally created sea pointer. | ||
76 | */ | ||
77 | struct gk20a_semaphore_sea *gk20a_semaphore_sea_create(struct gk20a *g) | ||
78 | { | ||
79 | if (g->sema_sea) | ||
80 | return g->sema_sea; | ||
81 | |||
82 | g->sema_sea = kzalloc(sizeof(*g->sema_sea), GFP_KERNEL); | ||
83 | if (!g->sema_sea) | ||
84 | return NULL; | ||
85 | |||
86 | g->sema_sea->size = 0; | ||
87 | g->sema_sea->page_count = 0; | ||
88 | g->sema_sea->gk20a = g; | ||
89 | INIT_LIST_HEAD(&g->sema_sea->pool_list); | ||
90 | mutex_init(&g->sema_sea->sea_lock); | ||
91 | |||
92 | if (__gk20a_semaphore_sea_grow(g->sema_sea)) | ||
93 | goto cleanup; | ||
94 | |||
95 | gpu_sema_dbg("Created semaphore sea!"); | ||
96 | return g->sema_sea; | ||
97 | |||
98 | cleanup: | ||
99 | kfree(g->sema_sea); | ||
100 | g->sema_sea = NULL; | ||
101 | gpu_sema_dbg("Failed to creat semaphore sea!"); | ||
102 | return NULL; | ||
103 | } | ||
104 | |||
105 | static int __semaphore_bitmap_alloc(unsigned long *bitmap, unsigned long len) | ||
106 | { | ||
107 | unsigned long idx = find_first_zero_bit(bitmap, len); | ||
108 | |||
109 | if (idx == len) | ||
110 | return -ENOSPC; | ||
111 | |||
112 | set_bit(idx, bitmap); | ||
113 | |||
114 | return (int)idx; | ||
115 | } | ||
116 | |||
117 | /* | ||
118 | * Allocate a pool from the sea. | ||
119 | */ | ||
120 | struct gk20a_semaphore_pool *gk20a_semaphore_pool_alloc( | ||
121 | struct gk20a_semaphore_sea *sea) | ||
122 | { | ||
123 | struct gk20a_semaphore_pool *p; | ||
124 | unsigned long page_idx; | ||
125 | int ret, err = 0; | ||
126 | |||
127 | p = kzalloc(sizeof(*p), GFP_KERNEL); | ||
128 | if (!p) | ||
129 | return ERR_PTR(-ENOMEM); | ||
130 | |||
131 | __lock_sema_sea(sea); | ||
132 | |||
133 | ret = __semaphore_bitmap_alloc(sea->pools_alloced, SEMAPHORE_POOL_COUNT); | ||
134 | if (ret < 0) { | ||
135 | err = ret; | ||
136 | goto fail; | ||
137 | } | ||
138 | |||
139 | page_idx = (unsigned long)ret; | ||
140 | |||
141 | p->page = sea->sea_mem.pages[page_idx]; | ||
142 | p->ro_sg_table = sea->ro_sg_table; | ||
143 | p->page_idx = page_idx; | ||
144 | p->sema_sea = sea; | ||
145 | INIT_LIST_HEAD(&p->hw_semas); | ||
146 | kref_init(&p->ref); | ||
147 | mutex_init(&p->pool_lock); | ||
148 | |||
149 | sea->page_count++; | ||
150 | list_add(&p->pool_list_entry, &sea->pool_list); | ||
151 | __unlock_sema_sea(sea); | ||
152 | |||
153 | gpu_sema_dbg("Allocated semaphore pool: page-idx=%d", p->page_idx); | ||
154 | |||
155 | return p; | ||
156 | |||
157 | fail: | ||
158 | __unlock_sema_sea(sea); | ||
159 | kfree(p); | ||
160 | gpu_sema_dbg("Failed to allocate semaphore pool!"); | ||
161 | return ERR_PTR(err); | ||
162 | } | ||
163 | |||
164 | /* | ||
165 | * Map a pool into the passed vm's address space. This handles both the fixed | ||
166 | * global RO mapping and the non-fixed private RW mapping. | ||
167 | */ | ||
168 | int gk20a_semaphore_pool_map(struct gk20a_semaphore_pool *p, | ||
169 | struct vm_gk20a *vm) | ||
170 | { | ||
171 | int ents, err = 0; | ||
172 | u64 addr; | ||
173 | |||
174 | gpu_sema_dbg("Mapping sempahore pool! (idx=%d)", p->page_idx); | ||
175 | |||
176 | p->cpu_va = vmap(&p->page, 1, 0, | ||
177 | pgprot_writecombine(PAGE_KERNEL)); | ||
178 | |||
179 | gpu_sema_dbg(" %d: CPU VA = 0x%p!", p->page_idx, p->cpu_va); | ||
180 | |||
181 | /* First do the RW mapping. */ | ||
182 | p->rw_sg_table = kzalloc(sizeof(*p->rw_sg_table), GFP_KERNEL); | ||
183 | if (!p->rw_sg_table) | ||
184 | return -ENOMEM; | ||
185 | |||
186 | err = sg_alloc_table_from_pages(p->rw_sg_table, &p->page, 1, 0, | ||
187 | PAGE_SIZE, GFP_KERNEL); | ||
188 | if (err) { | ||
189 | err = -ENOMEM; | ||
190 | goto fail; | ||
191 | } | ||
192 | |||
193 | /* Add IOMMU mapping... */ | ||
194 | ents = dma_map_sg(dev_from_vm(vm), p->rw_sg_table->sgl, 1, | ||
195 | DMA_BIDIRECTIONAL); | ||
196 | if (ents != 1) { | ||
197 | err = -ENOMEM; | ||
198 | goto fail_free_sgt; | ||
199 | } | ||
200 | |||
201 | gpu_sema_dbg(" %d: DMA addr = 0x%pad", p->page_idx, | ||
202 | &sg_dma_address(p->rw_sg_table->sgl)); | ||
203 | |||
204 | /* Map into the GPU... Doesn't need to be fixed. */ | ||
205 | p->gpu_va = gk20a_gmmu_map(vm, &p->rw_sg_table, PAGE_SIZE, | ||
206 | 0, gk20a_mem_flag_none, false, | ||
207 | APERTURE_SYSMEM); | ||
208 | if (!p->gpu_va) { | ||
209 | err = -ENOMEM; | ||
210 | goto fail_unmap_sgt; | ||
211 | } | ||
212 | |||
213 | gpu_sema_dbg(" %d: GPU read-write VA = 0x%llx", p->page_idx, | ||
214 | p->gpu_va); | ||
215 | |||
216 | /* | ||
217 | * And now the global mapping. Take the sea lock so that we don't race | ||
218 | * with a concurrent remap. | ||
219 | */ | ||
220 | __lock_sema_sea(p->sema_sea); | ||
221 | |||
222 | BUG_ON(p->mapped); | ||
223 | addr = gk20a_gmmu_fixed_map(vm, &p->sema_sea->ro_sg_table, | ||
224 | p->sema_sea->gpu_va, p->sema_sea->map_size, | ||
225 | 0, | ||
226 | gk20a_mem_flag_read_only, | ||
227 | false, | ||
228 | APERTURE_SYSMEM); | ||
229 | if (!addr) { | ||
230 | err = -ENOMEM; | ||
231 | BUG(); | ||
232 | goto fail_unlock; | ||
233 | } | ||
234 | p->gpu_va_ro = addr; | ||
235 | p->mapped = 1; | ||
236 | |||
237 | gpu_sema_dbg(" %d: GPU read-only VA = 0x%llx", p->page_idx, | ||
238 | p->gpu_va_ro); | ||
239 | |||
240 | __unlock_sema_sea(p->sema_sea); | ||
241 | |||
242 | return 0; | ||
243 | |||
244 | fail_unlock: | ||
245 | __unlock_sema_sea(p->sema_sea); | ||
246 | fail_unmap_sgt: | ||
247 | dma_unmap_sg(dev_from_vm(vm), p->rw_sg_table->sgl, 1, | ||
248 | DMA_BIDIRECTIONAL); | ||
249 | fail_free_sgt: | ||
250 | sg_free_table(p->rw_sg_table); | ||
251 | fail: | ||
252 | kfree(p->rw_sg_table); | ||
253 | p->rw_sg_table = NULL; | ||
254 | gpu_sema_dbg(" %d: Failed to map semaphore pool!", p->page_idx); | ||
255 | return err; | ||
256 | } | ||
257 | |||
258 | /* | ||
259 | * Unmap a semaphore_pool. | ||
260 | */ | ||
261 | void gk20a_semaphore_pool_unmap(struct gk20a_semaphore_pool *p, | ||
262 | struct vm_gk20a *vm) | ||
263 | { | ||
264 | struct gk20a_semaphore_int *hw_sema; | ||
265 | |||
266 | kunmap(p->cpu_va); | ||
267 | |||
268 | /* First the global RO mapping... */ | ||
269 | __lock_sema_sea(p->sema_sea); | ||
270 | gk20a_gmmu_unmap(vm, p->gpu_va_ro, | ||
271 | p->sema_sea->map_size, gk20a_mem_flag_none); | ||
272 | p->ro_sg_table = NULL; | ||
273 | __unlock_sema_sea(p->sema_sea); | ||
274 | |||
275 | /* And now the private RW mapping. */ | ||
276 | gk20a_gmmu_unmap(vm, p->gpu_va, PAGE_SIZE, gk20a_mem_flag_none); | ||
277 | p->gpu_va = 0; | ||
278 | |||
279 | dma_unmap_sg(dev_from_vm(vm), p->rw_sg_table->sgl, 1, | ||
280 | DMA_BIDIRECTIONAL); | ||
281 | |||
282 | sg_free_table(p->rw_sg_table); | ||
283 | kfree(p->rw_sg_table); | ||
284 | p->rw_sg_table = NULL; | ||
285 | |||
286 | list_for_each_entry(hw_sema, &p->hw_semas, hw_sema_list) | ||
287 | /* | ||
288 | * Make sure the mem addresses are all NULL so if this gets | ||
289 | * reused we will fault. | ||
290 | */ | ||
291 | hw_sema->value = NULL; | ||
292 | |||
293 | gpu_sema_dbg("Unmapped semaphore pool! (idx=%d)", p->page_idx); | ||
294 | } | ||
295 | |||
296 | /* | ||
297 | * Completely free a sempahore_pool. You should make sure this pool is not | ||
298 | * mapped otherwise there's going to be a memory leak. | ||
299 | */ | ||
300 | static void gk20a_semaphore_pool_free(struct kref *ref) | ||
301 | { | ||
302 | struct gk20a_semaphore_pool *p = | ||
303 | container_of(ref, struct gk20a_semaphore_pool, ref); | ||
304 | struct gk20a_semaphore_sea *s = p->sema_sea; | ||
305 | struct gk20a_semaphore_int *hw_sema, *tmp; | ||
306 | |||
307 | WARN_ON(p->gpu_va || p->rw_sg_table || p->ro_sg_table); | ||
308 | |||
309 | __lock_sema_sea(s); | ||
310 | list_del(&p->pool_list_entry); | ||
311 | clear_bit(p->page_idx, s->pools_alloced); | ||
312 | s->page_count--; | ||
313 | __unlock_sema_sea(s); | ||
314 | |||
315 | list_for_each_entry_safe(hw_sema, tmp, &p->hw_semas, hw_sema_list) | ||
316 | kfree(hw_sema); | ||
317 | |||
318 | gpu_sema_dbg("Freed semaphore pool! (idx=%d)", p->page_idx); | ||
319 | kfree(p); | ||
320 | } | ||
321 | |||
322 | void gk20a_semaphore_pool_get(struct gk20a_semaphore_pool *p) | ||
323 | { | ||
324 | kref_get(&p->ref); | ||
325 | } | ||
326 | |||
327 | void gk20a_semaphore_pool_put(struct gk20a_semaphore_pool *p) | ||
328 | { | ||
329 | kref_put(&p->ref, gk20a_semaphore_pool_free); | ||
330 | } | ||
331 | |||
332 | /* | ||
333 | * Get the address for a semaphore_pool - if global is true then return the | ||
334 | * global RO address instead of the RW address owned by the semaphore's VM. | ||
335 | */ | ||
336 | u64 __gk20a_semaphore_pool_gpu_va(struct gk20a_semaphore_pool *p, bool global) | ||
337 | { | ||
338 | if (!global) | ||
339 | return p->gpu_va; | ||
340 | |||
341 | return p->gpu_va_ro + (PAGE_SIZE * p->page_idx); | ||
342 | } | ||
343 | |||
344 | static int __gk20a_init_hw_sema(struct channel_gk20a *ch) | ||
345 | { | ||
346 | int hw_sema_idx; | ||
347 | int ret = 0; | ||
348 | struct gk20a_semaphore_int *hw_sema; | ||
349 | struct gk20a_semaphore_pool *p = ch->vm->sema_pool; | ||
350 | |||
351 | BUG_ON(!p); | ||
352 | |||
353 | mutex_lock(&p->pool_lock); | ||
354 | |||
355 | /* Find an available HW semaphore. */ | ||
356 | hw_sema_idx = __semaphore_bitmap_alloc(p->semas_alloced, | ||
357 | PAGE_SIZE / SEMAPHORE_SIZE); | ||
358 | if (hw_sema_idx < 0) { | ||
359 | ret = hw_sema_idx; | ||
360 | goto fail; | ||
361 | } | ||
362 | |||
363 | hw_sema = kzalloc(sizeof(struct gk20a_semaphore_int), GFP_KERNEL); | ||
364 | if (!hw_sema) { | ||
365 | ret = -ENOMEM; | ||
366 | goto fail_free_idx; | ||
367 | } | ||
368 | |||
369 | ch->hw_sema = hw_sema; | ||
370 | hw_sema->ch = ch; | ||
371 | hw_sema->p = p; | ||
372 | hw_sema->idx = hw_sema_idx; | ||
373 | hw_sema->offset = SEMAPHORE_SIZE * hw_sema_idx; | ||
374 | atomic_set(&hw_sema->next_value, 0); | ||
375 | hw_sema->value = p->cpu_va + hw_sema->offset; | ||
376 | writel(0, hw_sema->value); | ||
377 | |||
378 | list_add(&hw_sema->hw_sema_list, &p->hw_semas); | ||
379 | |||
380 | mutex_unlock(&p->pool_lock); | ||
381 | |||
382 | return 0; | ||
383 | |||
384 | fail_free_idx: | ||
385 | clear_bit(hw_sema_idx, p->semas_alloced); | ||
386 | fail: | ||
387 | mutex_unlock(&p->pool_lock); | ||
388 | return ret; | ||
389 | } | ||
390 | |||
391 | /* | ||
392 | * Free the channel used semaphore index | ||
393 | */ | ||
394 | void gk20a_semaphore_free_hw_sema(struct channel_gk20a *ch) | ||
395 | { | ||
396 | struct gk20a_semaphore_pool *p = ch->vm->sema_pool; | ||
397 | |||
398 | BUG_ON(!p); | ||
399 | |||
400 | mutex_lock(&p->pool_lock); | ||
401 | |||
402 | clear_bit(ch->hw_sema->idx, p->semas_alloced); | ||
403 | |||
404 | /* Make sure that when the ch is re-opened it will get a new HW sema. */ | ||
405 | list_del(&ch->hw_sema->hw_sema_list); | ||
406 | kfree(ch->hw_sema); | ||
407 | ch->hw_sema = NULL; | ||
408 | |||
409 | mutex_unlock(&p->pool_lock); | ||
410 | } | ||
411 | |||
412 | /* | ||
413 | * Allocate a semaphore from the passed pool. | ||
414 | * | ||
415 | * Since semaphores are ref-counted there's no explicit free for external code | ||
416 | * to use. When the ref-count hits 0 the internal free will happen. | ||
417 | */ | ||
418 | struct gk20a_semaphore *gk20a_semaphore_alloc(struct channel_gk20a *ch) | ||
419 | { | ||
420 | struct gk20a_semaphore *s; | ||
421 | int ret; | ||
422 | |||
423 | if (!ch->hw_sema) { | ||
424 | ret = __gk20a_init_hw_sema(ch); | ||
425 | if (ret) | ||
426 | return NULL; | ||
427 | } | ||
428 | |||
429 | s = kzalloc(sizeof(*s), GFP_KERNEL); | ||
430 | if (!s) | ||
431 | return NULL; | ||
432 | |||
433 | kref_init(&s->ref); | ||
434 | s->hw_sema = ch->hw_sema; | ||
435 | atomic_set(&s->value, 0); | ||
436 | |||
437 | /* | ||
438 | * Take a ref on the pool so that we can keep this pool alive for | ||
439 | * as long as this semaphore is alive. | ||
440 | */ | ||
441 | gk20a_semaphore_pool_get(s->hw_sema->p); | ||
442 | |||
443 | gpu_sema_dbg("Allocated semaphore (c=%d)", ch->hw_chid); | ||
444 | |||
445 | return s; | ||
446 | } | ||
447 | |||
448 | static void gk20a_semaphore_free(struct kref *ref) | ||
449 | { | ||
450 | struct gk20a_semaphore *s = | ||
451 | container_of(ref, struct gk20a_semaphore, ref); | ||
452 | |||
453 | gk20a_semaphore_pool_put(s->hw_sema->p); | ||
454 | |||
455 | kfree(s); | ||
456 | } | ||
457 | |||
458 | void gk20a_semaphore_put(struct gk20a_semaphore *s) | ||
459 | { | ||
460 | kref_put(&s->ref, gk20a_semaphore_free); | ||
461 | } | ||
462 | |||
463 | void gk20a_semaphore_get(struct gk20a_semaphore *s) | ||
464 | { | ||
465 | kref_get(&s->ref); | ||
466 | } | ||