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/sync_file.h>
6 #include <linux/pfn_t.h>
7
8 #include <drm/drm_file.h>
9 #include <drm/drm_syncobj.h>
10 #include <drm/drm_utils.h>
11
12 #include <drm/lima_drm.h>
13
14 #include "lima_drv.h"
15 #include "lima_gem.h"
16 #include "lima_gem_prime.h"
17 #include "lima_vm.h"
18 #include "lima_object.h"
19
lima_gem_create_handle(struct drm_device * dev,struct drm_file * file,u32 size,u32 flags,u32 * handle)20 int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file,
21 u32 size, u32 flags, u32 *handle)
22 {
23 int err;
24 struct lima_bo *bo;
25 struct lima_device *ldev = to_lima_dev(dev);
26
27 bo = lima_bo_create(ldev, size, flags, NULL);
28 if (IS_ERR(bo))
29 return PTR_ERR(bo);
30
31 err = drm_gem_handle_create(file, &bo->gem, handle);
32
33 /* drop reference from allocate - handle holds it now */
34 drm_gem_object_put_unlocked(&bo->gem);
35
36 return err;
37 }
38
lima_gem_free_object(struct drm_gem_object * obj)39 void lima_gem_free_object(struct drm_gem_object *obj)
40 {
41 struct lima_bo *bo = to_lima_bo(obj);
42
43 if (!list_empty(&bo->va))
44 dev_err(obj->dev->dev, "lima gem free bo still has va\n");
45
46 lima_bo_destroy(bo);
47 }
48
lima_gem_object_open(struct drm_gem_object * obj,struct drm_file * file)49 int lima_gem_object_open(struct drm_gem_object *obj, struct drm_file *file)
50 {
51 struct lima_bo *bo = to_lima_bo(obj);
52 struct lima_drm_priv *priv = to_lima_drm_priv(file);
53 struct lima_vm *vm = priv->vm;
54
55 return lima_vm_bo_add(vm, bo, true);
56 }
57
lima_gem_object_close(struct drm_gem_object * obj,struct drm_file * file)58 void lima_gem_object_close(struct drm_gem_object *obj, struct drm_file *file)
59 {
60 struct lima_bo *bo = to_lima_bo(obj);
61 struct lima_drm_priv *priv = to_lima_drm_priv(file);
62 struct lima_vm *vm = priv->vm;
63
64 lima_vm_bo_del(vm, bo);
65 }
66
lima_gem_get_info(struct drm_file * file,u32 handle,u32 * va,u64 * offset)67 int lima_gem_get_info(struct drm_file *file, u32 handle, u32 *va, u64 *offset)
68 {
69 struct drm_gem_object *obj;
70 struct lima_bo *bo;
71 struct lima_drm_priv *priv = to_lima_drm_priv(file);
72 struct lima_vm *vm = priv->vm;
73 int err;
74
75 obj = drm_gem_object_lookup(file, handle);
76 if (!obj)
77 return -ENOENT;
78
79 bo = to_lima_bo(obj);
80
81 *va = lima_vm_get_va(vm, bo);
82
83 err = drm_gem_create_mmap_offset(obj);
84 if (!err)
85 *offset = drm_vma_node_offset_addr(&obj->vma_node);
86
87 drm_gem_object_put_unlocked(obj);
88 return err;
89 }
90
lima_gem_fault(struct vm_fault * vmf)91 static vm_fault_t lima_gem_fault(struct vm_fault *vmf)
92 {
93 struct vm_area_struct *vma = vmf->vma;
94 struct drm_gem_object *obj = vma->vm_private_data;
95 struct lima_bo *bo = to_lima_bo(obj);
96 pfn_t pfn;
97 pgoff_t pgoff;
98
99 /* We don't use vmf->pgoff since that has the fake offset: */
100 pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
101 pfn = __pfn_to_pfn_t(page_to_pfn(bo->pages[pgoff]), PFN_DEV);
102
103 return vmf_insert_mixed(vma, vmf->address, pfn);
104 }
105
106 const struct vm_operations_struct lima_gem_vm_ops = {
107 .fault = lima_gem_fault,
108 .open = drm_gem_vm_open,
109 .close = drm_gem_vm_close,
110 };
111
lima_set_vma_flags(struct vm_area_struct * vma)112 void lima_set_vma_flags(struct vm_area_struct *vma)
113 {
114 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
115
116 vma->vm_flags |= VM_MIXEDMAP;
117 vma->vm_flags &= ~VM_PFNMAP;
118 vma->vm_page_prot = pgprot_writecombine(prot);
119 }
120
lima_gem_mmap(struct file * filp,struct vm_area_struct * vma)121 int lima_gem_mmap(struct file *filp, struct vm_area_struct *vma)
122 {
123 int ret;
124
125 ret = drm_gem_mmap(filp, vma);
126 if (ret)
127 return ret;
128
129 lima_set_vma_flags(vma);
130 return 0;
131 }
132
lima_gem_sync_bo(struct lima_sched_task * task,struct lima_bo * bo,bool write,bool explicit)133 static int lima_gem_sync_bo(struct lima_sched_task *task, struct lima_bo *bo,
134 bool write, bool explicit)
135 {
136 int err = 0;
137
138 if (!write) {
139 err = dma_resv_reserve_shared(bo->gem.resv, 1);
140 if (err)
141 return err;
142 }
143
144 /* explicit sync use user passed dep fence */
145 if (explicit)
146 return 0;
147
148 return drm_gem_fence_array_add_implicit(&task->deps, &bo->gem, write);
149 }
150
lima_gem_lock_bos(struct lima_bo ** bos,u32 nr_bos,struct ww_acquire_ctx * ctx)151 static int lima_gem_lock_bos(struct lima_bo **bos, u32 nr_bos,
152 struct ww_acquire_ctx *ctx)
153 {
154 int i, ret = 0, contended, slow_locked = -1;
155
156 ww_acquire_init(ctx, &reservation_ww_class);
157
158 retry:
159 for (i = 0; i < nr_bos; i++) {
160 if (i == slow_locked) {
161 slow_locked = -1;
162 continue;
163 }
164
165 ret = ww_mutex_lock_interruptible(&bos[i]->gem.resv->lock, ctx);
166 if (ret < 0) {
167 contended = i;
168 goto err;
169 }
170 }
171
172 ww_acquire_done(ctx);
173 return 0;
174
175 err:
176 for (i--; i >= 0; i--)
177 ww_mutex_unlock(&bos[i]->gem.resv->lock);
178
179 if (slow_locked >= 0)
180 ww_mutex_unlock(&bos[slow_locked]->gem.resv->lock);
181
182 if (ret == -EDEADLK) {
183 /* we lost out in a seqno race, lock and retry.. */
184 ret = ww_mutex_lock_slow_interruptible(
185 &bos[contended]->gem.resv->lock, ctx);
186 if (!ret) {
187 slow_locked = contended;
188 goto retry;
189 }
190 }
191 ww_acquire_fini(ctx);
192
193 return ret;
194 }
195
lima_gem_unlock_bos(struct lima_bo ** bos,u32 nr_bos,struct ww_acquire_ctx * ctx)196 static void lima_gem_unlock_bos(struct lima_bo **bos, u32 nr_bos,
197 struct ww_acquire_ctx *ctx)
198 {
199 int i;
200
201 for (i = 0; i < nr_bos; i++)
202 ww_mutex_unlock(&bos[i]->gem.resv->lock);
203 ww_acquire_fini(ctx);
204 }
205
lima_gem_add_deps(struct drm_file * file,struct lima_submit * submit)206 static int lima_gem_add_deps(struct drm_file *file, struct lima_submit *submit)
207 {
208 int i, err;
209
210 for (i = 0; i < ARRAY_SIZE(submit->in_sync); i++) {
211 struct dma_fence *fence = NULL;
212
213 if (!submit->in_sync[i])
214 continue;
215
216 err = drm_syncobj_find_fence(file, submit->in_sync[i],
217 0, 0, &fence);
218 if (err)
219 return err;
220
221 err = drm_gem_fence_array_add(&submit->task->deps, fence);
222 if (err) {
223 dma_fence_put(fence);
224 return err;
225 }
226 }
227
228 return 0;
229 }
230
lima_gem_submit(struct drm_file * file,struct lima_submit * submit)231 int lima_gem_submit(struct drm_file *file, struct lima_submit *submit)
232 {
233 int i, err = 0;
234 struct ww_acquire_ctx ctx;
235 struct lima_drm_priv *priv = to_lima_drm_priv(file);
236 struct lima_vm *vm = priv->vm;
237 struct drm_syncobj *out_sync = NULL;
238 struct dma_fence *fence;
239 struct lima_bo **bos = submit->lbos;
240
241 if (submit->out_sync) {
242 out_sync = drm_syncobj_find(file, submit->out_sync);
243 if (!out_sync)
244 return -ENOENT;
245 }
246
247 for (i = 0; i < submit->nr_bos; i++) {
248 struct drm_gem_object *obj;
249 struct lima_bo *bo;
250
251 obj = drm_gem_object_lookup(file, submit->bos[i].handle);
252 if (!obj) {
253 err = -ENOENT;
254 goto err_out0;
255 }
256
257 bo = to_lima_bo(obj);
258
259 /* increase refcnt of gpu va map to prevent unmapped when executing,
260 * will be decreased when task done
261 */
262 err = lima_vm_bo_add(vm, bo, false);
263 if (err) {
264 drm_gem_object_put_unlocked(obj);
265 goto err_out0;
266 }
267
268 bos[i] = bo;
269 }
270
271 err = lima_gem_lock_bos(bos, submit->nr_bos, &ctx);
272 if (err)
273 goto err_out0;
274
275 err = lima_sched_task_init(
276 submit->task, submit->ctx->context + submit->pipe,
277 bos, submit->nr_bos, vm);
278 if (err)
279 goto err_out1;
280
281 err = lima_gem_add_deps(file, submit);
282 if (err)
283 goto err_out2;
284
285 for (i = 0; i < submit->nr_bos; i++) {
286 err = lima_gem_sync_bo(
287 submit->task, bos[i],
288 submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE,
289 submit->flags & LIMA_SUBMIT_FLAG_EXPLICIT_FENCE);
290 if (err)
291 goto err_out2;
292 }
293
294 fence = lima_sched_context_queue_task(
295 submit->ctx->context + submit->pipe, submit->task);
296
297 for (i = 0; i < submit->nr_bos; i++) {
298 if (submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE)
299 dma_resv_add_excl_fence(bos[i]->gem.resv, fence);
300 else
301 dma_resv_add_shared_fence(bos[i]->gem.resv, fence);
302 }
303
304 lima_gem_unlock_bos(bos, submit->nr_bos, &ctx);
305
306 for (i = 0; i < submit->nr_bos; i++)
307 drm_gem_object_put_unlocked(&bos[i]->gem);
308
309 if (out_sync) {
310 drm_syncobj_replace_fence(out_sync, fence);
311 drm_syncobj_put(out_sync);
312 }
313
314 dma_fence_put(fence);
315
316 return 0;
317
318 err_out2:
319 lima_sched_task_fini(submit->task);
320 err_out1:
321 lima_gem_unlock_bos(bos, submit->nr_bos, &ctx);
322 err_out0:
323 for (i = 0; i < submit->nr_bos; i++) {
324 if (!bos[i])
325 break;
326 lima_vm_bo_del(vm, bos[i]);
327 drm_gem_object_put_unlocked(&bos[i]->gem);
328 }
329 if (out_sync)
330 drm_syncobj_put(out_sync);
331 return err;
332 }
333
lima_gem_wait(struct drm_file * file,u32 handle,u32 op,s64 timeout_ns)334 int lima_gem_wait(struct drm_file *file, u32 handle, u32 op, s64 timeout_ns)
335 {
336 bool write = op & LIMA_GEM_WAIT_WRITE;
337 long ret, timeout;
338
339 if (!op)
340 return 0;
341
342 timeout = drm_timeout_abs_to_jiffies(timeout_ns);
343
344 ret = drm_gem_dma_resv_wait(file, handle, write, timeout);
345 if (ret == -ETIME)
346 ret = timeout ? -ETIMEDOUT : -EBUSY;
347
348 return ret;
349 }
350
