1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */
3
4#include <linux/mm.h>
5#include <linux/iosys-map.h>
6#include <linux/sync_file.h>
7#include <linux/pagemap.h>
8#include <linux/shmem_fs.h>
9#include <linux/dma-mapping.h>
10
11#include <drm/drm_file.h>
12#include <drm/drm_syncobj.h>
13#include <drm/drm_utils.h>
14
15#include <drm/lima_drm.h>
16
17#include "lima_drv.h"
18#include "lima_gem.h"
19#include "lima_vm.h"
20
21int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm)
22{
23 struct page **pages;
24 struct address_space *mapping = bo->base.base.filp->f_mapping;
25 struct device *dev = bo->base.base.dev->dev;
26 size_t old_size = bo->heap_size;
27 size_t new_size = bo->heap_size ? bo->heap_size * 2 :
28 (lima_heap_init_nr_pages << PAGE_SHIFT);
29 struct sg_table sgt;
30 int i, ret;
31
32 if (bo->heap_size >= bo->base.base.size)
33 return -ENOSPC;
34
35 new_size = min(new_size, bo->base.base.size);
36
37 dma_resv_lock(obj: bo->base.base.resv, NULL);
38
39 if (bo->base.pages) {
40 pages = bo->base.pages;
41 } else {
42 pages = kvmalloc_array(bo->base.base.size >> PAGE_SHIFT,
43 sizeof(*pages), GFP_KERNEL | __GFP_ZERO);
44 if (!pages) {
45 dma_resv_unlock(obj: bo->base.base.resv);
46 return -ENOMEM;
47 }
48
49 bo->base.pages = pages;
50 refcount_set(r: &bo->base.pages_use_count, n: 1);
51
52 mapping_set_unevictable(mapping);
53 }
54
55 for (i = old_size >> PAGE_SHIFT; i < new_size >> PAGE_SHIFT; i++) {
56 struct page *page = shmem_read_mapping_page(mapping, index: i);
57
58 if (IS_ERR(ptr: page)) {
59 dma_resv_unlock(obj: bo->base.base.resv);
60 return PTR_ERR(ptr: page);
61 }
62 pages[i] = page;
63 }
64
65 dma_resv_unlock(obj: bo->base.base.resv);
66
67 ret = sg_alloc_table_from_pages(sgt: &sgt, pages, n_pages: i, offset: 0,
68 size: new_size, GFP_KERNEL);
69 if (ret)
70 return ret;
71
72 if (bo->base.sgt) {
73 dma_unmap_sgtable(dev, sgt: bo->base.sgt, dir: DMA_BIDIRECTIONAL, attrs: 0);
74 sg_free_table(bo->base.sgt);
75 } else {
76 bo->base.sgt = kmalloc(sizeof(*bo->base.sgt), GFP_KERNEL);
77 if (!bo->base.sgt) {
78 ret = -ENOMEM;
79 goto err_out0;
80 }
81 }
82
83 ret = dma_map_sgtable(dev, sgt: &sgt, dir: DMA_BIDIRECTIONAL, attrs: 0);
84 if (ret)
85 goto err_out1;
86
87 *bo->base.sgt = sgt;
88
89 if (vm) {
90 ret = lima_vm_map_bo(vm, bo, pageoff: old_size >> PAGE_SHIFT);
91 if (ret)
92 goto err_out2;
93 }
94
95 bo->heap_size = new_size;
96 return 0;
97
98err_out2:
99 dma_unmap_sgtable(dev, sgt: &sgt, dir: DMA_BIDIRECTIONAL, attrs: 0);
100err_out1:
101 kfree(objp: bo->base.sgt);
102 bo->base.sgt = NULL;
103err_out0:
104 sg_free_table(&sgt);
105 return ret;
106}
107
108int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file,
109 u32 size, u32 flags, u32 *handle)
110{
111 int err;
112 gfp_t mask;
113 struct drm_gem_shmem_object *shmem;
114 struct drm_gem_object *obj;
115 struct lima_bo *bo;
116 bool is_heap = flags & LIMA_BO_FLAG_HEAP;
117
118 shmem = drm_gem_shmem_create(dev, size);
119 if (IS_ERR(ptr: shmem))
120 return PTR_ERR(ptr: shmem);
121
122 obj = &shmem->base;
123
124 /* Mali Utgard GPU can only support 32bit address space */
125 mask = mapping_gfp_mask(mapping: obj->filp->f_mapping);
126 mask &= ~__GFP_HIGHMEM;
127 mask |= __GFP_DMA32;
128 mapping_set_gfp_mask(m: obj->filp->f_mapping, mask);
129
130 if (is_heap) {
131 bo = to_lima_bo(obj);
132 err = lima_heap_alloc(bo, NULL);
133 if (err)
134 goto out;
135 } else {
136 struct sg_table *sgt = drm_gem_shmem_get_pages_sgt(shmem);
137
138 if (IS_ERR(ptr: sgt)) {
139 err = PTR_ERR(ptr: sgt);
140 goto out;
141 }
142 }
143
144 err = drm_gem_handle_create(file_priv: file, obj, handlep: handle);
145
146out:
147 /* drop reference from allocate - handle holds it now */
148 drm_gem_object_put(obj);
149
150 return err;
151}
152
153static void lima_gem_free_object(struct drm_gem_object *obj)
154{
155 struct lima_bo *bo = to_lima_bo(obj);
156
157 if (!list_empty(head: &bo->va))
158 dev_err(obj->dev->dev, "lima gem free bo still has va\n");
159
160 drm_gem_shmem_free(shmem: &bo->base);
161}
162
163static int lima_gem_object_open(struct drm_gem_object *obj, struct drm_file *file)
164{
165 struct lima_bo *bo = to_lima_bo(obj);
166 struct lima_drm_priv *priv = to_lima_drm_priv(file);
167 struct lima_vm *vm = priv->vm;
168
169 return lima_vm_bo_add(vm, bo, create: true);
170}
171
172static void lima_gem_object_close(struct drm_gem_object *obj, struct drm_file *file)
173{
174 struct lima_bo *bo = to_lima_bo(obj);
175 struct lima_drm_priv *priv = to_lima_drm_priv(file);
176 struct lima_vm *vm = priv->vm;
177
178 lima_vm_bo_del(vm, bo);
179}
180
181static int lima_gem_pin(struct drm_gem_object *obj)
182{
183 struct lima_bo *bo = to_lima_bo(obj);
184
185 if (bo->heap_size)
186 return -EINVAL;
187
188 return drm_gem_shmem_pin_locked(shmem: &bo->base);
189}
190
191static int lima_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map)
192{
193 struct lima_bo *bo = to_lima_bo(obj);
194
195 if (bo->heap_size)
196 return -EINVAL;
197
198 return drm_gem_shmem_vmap_locked(shmem: &bo->base, map);
199}
200
201static int lima_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
202{
203 struct lima_bo *bo = to_lima_bo(obj);
204
205 if (bo->heap_size)
206 return -EINVAL;
207
208 return drm_gem_shmem_mmap(shmem: &bo->base, vma);
209}
210
211static const struct drm_gem_object_funcs lima_gem_funcs = {
212 .free = lima_gem_free_object,
213 .open = lima_gem_object_open,
214 .close = lima_gem_object_close,
215 .print_info = drm_gem_shmem_object_print_info,
216 .pin = lima_gem_pin,
217 .unpin = drm_gem_shmem_object_unpin,
218 .get_sg_table = drm_gem_shmem_object_get_sg_table,
219 .vmap = lima_gem_vmap,
220 .vunmap = drm_gem_shmem_object_vunmap,
221 .mmap = lima_gem_mmap,
222 .vm_ops = &drm_gem_shmem_vm_ops,
223};
224
225struct drm_gem_object *lima_gem_create_object(struct drm_device *dev, size_t size)
226{
227 struct lima_bo *bo;
228
229 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
230 if (!bo)
231 return ERR_PTR(error: -ENOMEM);
232
233 mutex_init(&bo->lock);
234 INIT_LIST_HEAD(list: &bo->va);
235 bo->base.map_wc = true;
236 bo->base.base.funcs = &lima_gem_funcs;
237
238 return &bo->base.base;
239}
240
241int lima_gem_get_info(struct drm_file *file, u32 handle, u32 *va, u64 *offset)
242{
243 struct drm_gem_object *obj;
244 struct lima_bo *bo;
245 struct lima_drm_priv *priv = to_lima_drm_priv(file);
246 struct lima_vm *vm = priv->vm;
247
248 obj = drm_gem_object_lookup(filp: file, handle);
249 if (!obj)
250 return -ENOENT;
251
252 bo = to_lima_bo(obj);
253
254 *va = lima_vm_get_va(vm, bo);
255
256 *offset = drm_vma_node_offset_addr(node: &obj->vma_node);
257
258 drm_gem_object_put(obj);
259 return 0;
260}
261
262static int lima_gem_sync_bo(struct lima_sched_task *task, struct lima_bo *bo,
263 bool write, bool explicit)
264{
265 int err;
266
267 err = dma_resv_reserve_fences(obj: lima_bo_resv(bo), num_fences: 1);
268 if (err)
269 return err;
270
271 /* explicit sync use user passed dep fence */
272 if (explicit)
273 return 0;
274
275 return drm_sched_job_add_implicit_dependencies(job: &task->base,
276 obj: &bo->base.base,
277 write);
278}
279
280static int lima_gem_add_deps(struct drm_file *file, struct lima_submit *submit)
281{
282 int i, err;
283
284 for (i = 0; i < ARRAY_SIZE(submit->in_sync); i++) {
285 if (!submit->in_sync[i])
286 continue;
287
288 err = drm_sched_job_add_syncobj_dependency(job: &submit->task->base, file,
289 handle: submit->in_sync[i], point: 0);
290 if (err)
291 return err;
292 }
293
294 return 0;
295}
296
297int lima_gem_submit(struct drm_file *file, struct lima_submit *submit)
298{
299 int i, err = 0;
300 struct ww_acquire_ctx ctx;
301 struct lima_drm_priv *priv = to_lima_drm_priv(file);
302 struct lima_vm *vm = priv->vm;
303 struct drm_syncobj *out_sync = NULL;
304 struct dma_fence *fence;
305 struct lima_bo **bos = submit->lbos;
306
307 if (submit->out_sync) {
308 out_sync = drm_syncobj_find(file_private: file, handle: submit->out_sync);
309 if (!out_sync)
310 return -ENOENT;
311 }
312
313 for (i = 0; i < submit->nr_bos; i++) {
314 struct drm_gem_object *obj;
315 struct lima_bo *bo;
316
317 obj = drm_gem_object_lookup(filp: file, handle: submit->bos[i].handle);
318 if (!obj) {
319 err = -ENOENT;
320 goto err_out0;
321 }
322
323 bo = to_lima_bo(obj);
324
325 /* increase refcnt of gpu va map to prevent unmapped when executing,
326 * will be decreased when task done
327 */
328 err = lima_vm_bo_add(vm, bo, create: false);
329 if (err) {
330 drm_gem_object_put(obj);
331 goto err_out0;
332 }
333
334 bos[i] = bo;
335 }
336
337 err = drm_gem_lock_reservations(objs: (struct drm_gem_object **)bos,
338 count: submit->nr_bos, acquire_ctx: &ctx);
339 if (err)
340 goto err_out0;
341
342 err = lima_sched_task_init(
343 task: submit->task, context: submit->ctx->context + submit->pipe,
344 bos, num_bos: submit->nr_bos, vm, drm_client_id: file->client_id);
345 if (err)
346 goto err_out1;
347
348 err = lima_gem_add_deps(file, submit);
349 if (err)
350 goto err_out2;
351
352 for (i = 0; i < submit->nr_bos; i++) {
353 err = lima_gem_sync_bo(
354 task: submit->task, bo: bos[i],
355 write: submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE,
356 explicit: submit->flags & LIMA_SUBMIT_FLAG_EXPLICIT_FENCE);
357 if (err)
358 goto err_out2;
359 }
360
361 fence = lima_sched_context_queue_task(task: submit->task);
362
363 for (i = 0; i < submit->nr_bos; i++) {
364 dma_resv_add_fence(obj: lima_bo_resv(bo: bos[i]), fence,
365 usage: submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE ?
366 DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ);
367 }
368
369 drm_gem_unlock_reservations(objs: (struct drm_gem_object **)bos,
370 count: submit->nr_bos, acquire_ctx: &ctx);
371
372 for (i = 0; i < submit->nr_bos; i++)
373 drm_gem_object_put(obj: &bos[i]->base.base);
374
375 if (out_sync) {
376 drm_syncobj_replace_fence(syncobj: out_sync, fence);
377 drm_syncobj_put(obj: out_sync);
378 }
379
380 dma_fence_put(fence);
381
382 return 0;
383
384err_out2:
385 lima_sched_task_fini(task: submit->task);
386err_out1:
387 drm_gem_unlock_reservations(objs: (struct drm_gem_object **)bos,
388 count: submit->nr_bos, acquire_ctx: &ctx);
389err_out0:
390 for (i = 0; i < submit->nr_bos; i++) {
391 if (!bos[i])
392 break;
393 lima_vm_bo_del(vm, bo: bos[i]);
394 drm_gem_object_put(obj: &bos[i]->base.base);
395 }
396 if (out_sync)
397 drm_syncobj_put(obj: out_sync);
398 return err;
399}
400
401int lima_gem_wait(struct drm_file *file, u32 handle, u32 op, s64 timeout_ns)
402{
403 bool write = op & LIMA_GEM_WAIT_WRITE;
404 long ret, timeout;
405
406 if (!op)
407 return 0;
408
409 timeout = drm_timeout_abs_to_jiffies(timeout_nsec: timeout_ns);
410
411 ret = drm_gem_dma_resv_wait(filep: file, handle, wait_all: write, timeout);
412 if (ret == -ETIME)
413 ret = timeout ? -ETIMEDOUT : -EBUSY;
414
415 return ret;
416}
417

source code of linux/drivers/gpu/drm/lima/lima_gem.c