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[linux.git] / drivers / gpu / drm / amd / amdgpu / amdgpu_ring.c
1 /*
2  * Copyright 2008 Advanced Micro Devices, Inc.
3  * Copyright 2008 Red Hat Inc.
4  * Copyright 2009 Jerome Glisse.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  *
24  * Authors: Dave Airlie
25  *          Alex Deucher
26  *          Jerome Glisse
27  *          Christian König
28  */
29 #include <linux/seq_file.h>
30 #include <linux/slab.h>
31 #include <linux/uaccess.h>
32 #include <linux/debugfs.h>
33
34 #include <drm/amdgpu_drm.h>
35 #include "amdgpu.h"
36 #include "atom.h"
37
38 /*
39  * Rings
40  * Most engines on the GPU are fed via ring buffers.  Ring
41  * buffers are areas of GPU accessible memory that the host
42  * writes commands into and the GPU reads commands out of.
43  * There is a rptr (read pointer) that determines where the
44  * GPU is currently reading, and a wptr (write pointer)
45  * which determines where the host has written.  When the
46  * pointers are equal, the ring is idle.  When the host
47  * writes commands to the ring buffer, it increments the
48  * wptr.  The GPU then starts fetching commands and executes
49  * them until the pointers are equal again.
50  */
51
52 /**
53  * amdgpu_ring_alloc - allocate space on the ring buffer
54  *
55  * @adev: amdgpu_device pointer
56  * @ring: amdgpu_ring structure holding ring information
57  * @ndw: number of dwords to allocate in the ring buffer
58  *
59  * Allocate @ndw dwords in the ring buffer (all asics).
60  * Returns 0 on success, error on failure.
61  */
62 int amdgpu_ring_alloc(struct amdgpu_ring *ring, unsigned ndw)
63 {
64         /* Align requested size with padding so unlock_commit can
65          * pad safely */
66         ndw = (ndw + ring->funcs->align_mask) & ~ring->funcs->align_mask;
67
68         /* Make sure we aren't trying to allocate more space
69          * than the maximum for one submission
70          */
71         if (WARN_ON_ONCE(ndw > ring->max_dw))
72                 return -ENOMEM;
73
74         ring->count_dw = ndw;
75         ring->wptr_old = ring->wptr;
76
77         if (ring->funcs->begin_use)
78                 ring->funcs->begin_use(ring);
79
80         return 0;
81 }
82
83 /** amdgpu_ring_insert_nop - insert NOP packets
84  *
85  * @ring: amdgpu_ring structure holding ring information
86  * @count: the number of NOP packets to insert
87  *
88  * This is the generic insert_nop function for rings except SDMA
89  */
90 void amdgpu_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)
91 {
92         int i;
93
94         for (i = 0; i < count; i++)
95                 amdgpu_ring_write(ring, ring->funcs->nop);
96 }
97
98 /** amdgpu_ring_generic_pad_ib - pad IB with NOP packets
99  *
100  * @ring: amdgpu_ring structure holding ring information
101  * @ib: IB to add NOP packets to
102  *
103  * This is the generic pad_ib function for rings except SDMA
104  */
105 void amdgpu_ring_generic_pad_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib)
106 {
107         while (ib->length_dw & ring->funcs->align_mask)
108                 ib->ptr[ib->length_dw++] = ring->funcs->nop;
109 }
110
111 /**
112  * amdgpu_ring_commit - tell the GPU to execute the new
113  * commands on the ring buffer
114  *
115  * @adev: amdgpu_device pointer
116  * @ring: amdgpu_ring structure holding ring information
117  *
118  * Update the wptr (write pointer) to tell the GPU to
119  * execute new commands on the ring buffer (all asics).
120  */
121 void amdgpu_ring_commit(struct amdgpu_ring *ring)
122 {
123         uint32_t count;
124
125         /* We pad to match fetch size */
126         count = ring->funcs->align_mask + 1 -
127                 (ring->wptr & ring->funcs->align_mask);
128         count %= ring->funcs->align_mask + 1;
129         ring->funcs->insert_nop(ring, count);
130
131         mb();
132         amdgpu_ring_set_wptr(ring);
133
134         if (ring->funcs->end_use)
135                 ring->funcs->end_use(ring);
136 }
137
138 /**
139  * amdgpu_ring_undo - reset the wptr
140  *
141  * @ring: amdgpu_ring structure holding ring information
142  *
143  * Reset the driver's copy of the wptr (all asics).
144  */
145 void amdgpu_ring_undo(struct amdgpu_ring *ring)
146 {
147         ring->wptr = ring->wptr_old;
148
149         if (ring->funcs->end_use)
150                 ring->funcs->end_use(ring);
151 }
152
153 /**
154  * amdgpu_ring_init - init driver ring struct.
155  *
156  * @adev: amdgpu_device pointer
157  * @ring: amdgpu_ring structure holding ring information
158  * @max_ndw: maximum number of dw for ring alloc
159  * @nop: nop packet for this ring
160  *
161  * Initialize the driver information for the selected ring (all asics).
162  * Returns 0 on success, error on failure.
163  */
164 int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
165                      unsigned max_dw, struct amdgpu_irq_src *irq_src,
166                      unsigned irq_type)
167 {
168         int r, i;
169         int sched_hw_submission = amdgpu_sched_hw_submission;
170
171         /* Set the hw submission limit higher for KIQ because
172          * it's used for a number of gfx/compute tasks by both
173          * KFD and KGD which may have outstanding fences and
174          * it doesn't really use the gpu scheduler anyway;
175          * KIQ tasks get submitted directly to the ring.
176          */
177         if (ring->funcs->type == AMDGPU_RING_TYPE_KIQ)
178                 sched_hw_submission = max(sched_hw_submission, 256);
179         else if (ring == &adev->sdma.instance[0].page)
180                 sched_hw_submission = 256;
181
182         if (ring->adev == NULL) {
183                 if (adev->num_rings >= AMDGPU_MAX_RINGS)
184                         return -EINVAL;
185
186                 ring->adev = adev;
187                 ring->idx = adev->num_rings++;
188                 adev->rings[ring->idx] = ring;
189                 r = amdgpu_fence_driver_init_ring(ring, sched_hw_submission);
190                 if (r)
191                         return r;
192         }
193
194         r = amdgpu_device_wb_get(adev, &ring->rptr_offs);
195         if (r) {
196                 dev_err(adev->dev, "(%d) ring rptr_offs wb alloc failed\n", r);
197                 return r;
198         }
199
200         r = amdgpu_device_wb_get(adev, &ring->wptr_offs);
201         if (r) {
202                 dev_err(adev->dev, "(%d) ring wptr_offs wb alloc failed\n", r);
203                 return r;
204         }
205
206         r = amdgpu_device_wb_get(adev, &ring->fence_offs);
207         if (r) {
208                 dev_err(adev->dev, "(%d) ring fence_offs wb alloc failed\n", r);
209                 return r;
210         }
211
212         r = amdgpu_device_wb_get(adev, &ring->trail_fence_offs);
213         if (r) {
214                 dev_err(adev->dev,
215                         "(%d) ring trail_fence_offs wb alloc failed\n", r);
216                 return r;
217         }
218         ring->trail_fence_gpu_addr =
219                 adev->wb.gpu_addr + (ring->trail_fence_offs * 4);
220         ring->trail_fence_cpu_addr = &adev->wb.wb[ring->trail_fence_offs];
221
222         r = amdgpu_device_wb_get(adev, &ring->cond_exe_offs);
223         if (r) {
224                 dev_err(adev->dev, "(%d) ring cond_exec_polling wb alloc failed\n", r);
225                 return r;
226         }
227         ring->cond_exe_gpu_addr = adev->wb.gpu_addr + (ring->cond_exe_offs * 4);
228         ring->cond_exe_cpu_addr = &adev->wb.wb[ring->cond_exe_offs];
229         /* always set cond_exec_polling to CONTINUE */
230         *ring->cond_exe_cpu_addr = 1;
231
232         r = amdgpu_fence_driver_start_ring(ring, irq_src, irq_type);
233         if (r) {
234                 dev_err(adev->dev, "failed initializing fences (%d).\n", r);
235                 return r;
236         }
237
238         ring->ring_size = roundup_pow_of_two(max_dw * 4 * sched_hw_submission);
239
240         ring->buf_mask = (ring->ring_size / 4) - 1;
241         ring->ptr_mask = ring->funcs->support_64bit_ptrs ?
242                 0xffffffffffffffff : ring->buf_mask;
243         /* Allocate ring buffer */
244         if (ring->ring_obj == NULL) {
245                 r = amdgpu_bo_create_kernel(adev, ring->ring_size + ring->funcs->extra_dw, PAGE_SIZE,
246                                             AMDGPU_GEM_DOMAIN_GTT,
247                                             &ring->ring_obj,
248                                             &ring->gpu_addr,
249                                             (void **)&ring->ring);
250                 if (r) {
251                         dev_err(adev->dev, "(%d) ring create failed\n", r);
252                         return r;
253                 }
254                 amdgpu_ring_clear_ring(ring);
255         }
256
257         ring->max_dw = max_dw;
258         ring->priority = DRM_SCHED_PRIORITY_NORMAL;
259         mutex_init(&ring->priority_mutex);
260
261         for (i = 0; i < DRM_SCHED_PRIORITY_MAX; ++i)
262                 atomic_set(&ring->num_jobs[i], 0);
263
264         return 0;
265 }
266
267 /**
268  * amdgpu_ring_fini - tear down the driver ring struct.
269  *
270  * @adev: amdgpu_device pointer
271  * @ring: amdgpu_ring structure holding ring information
272  *
273  * Tear down the driver information for the selected ring (all asics).
274  */
275 void amdgpu_ring_fini(struct amdgpu_ring *ring)
276 {
277
278         /* Not to finish a ring which is not initialized */
279         if (!(ring->adev) || !(ring->adev->rings[ring->idx]))
280                 return;
281
282         ring->sched.ready = false;
283
284         amdgpu_device_wb_free(ring->adev, ring->rptr_offs);
285         amdgpu_device_wb_free(ring->adev, ring->wptr_offs);
286
287         amdgpu_device_wb_free(ring->adev, ring->cond_exe_offs);
288         amdgpu_device_wb_free(ring->adev, ring->fence_offs);
289
290         amdgpu_bo_free_kernel(&ring->ring_obj,
291                               &ring->gpu_addr,
292                               (void **)&ring->ring);
293
294         dma_fence_put(ring->vmid_wait);
295         ring->vmid_wait = NULL;
296         ring->me = 0;
297
298         ring->adev->rings[ring->idx] = NULL;
299 }
300
301 /**
302  * amdgpu_ring_emit_reg_write_reg_wait_helper - ring helper
303  *
304  * @adev: amdgpu_device pointer
305  * @reg0: register to write
306  * @reg1: register to wait on
307  * @ref: reference value to write/wait on
308  * @mask: mask to wait on
309  *
310  * Helper for rings that don't support write and wait in a
311  * single oneshot packet.
312  */
313 void amdgpu_ring_emit_reg_write_reg_wait_helper(struct amdgpu_ring *ring,
314                                                 uint32_t reg0, uint32_t reg1,
315                                                 uint32_t ref, uint32_t mask)
316 {
317         amdgpu_ring_emit_wreg(ring, reg0, ref);
318         amdgpu_ring_emit_reg_wait(ring, reg1, mask, mask);
319 }
320
321 /**
322  * amdgpu_ring_soft_recovery - try to soft recover a ring lockup
323  *
324  * @ring: ring to try the recovery on
325  * @vmid: VMID we try to get going again
326  * @fence: timedout fence
327  *
328  * Tries to get a ring proceeding again when it is stuck.
329  */
330 bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,
331                                struct dma_fence *fence)
332 {
333         ktime_t deadline = ktime_add_us(ktime_get(), 10000);
334
335         if (amdgpu_sriov_vf(ring->adev) || !ring->funcs->soft_recovery || !fence)
336                 return false;
337
338         atomic_inc(&ring->adev->gpu_reset_counter);
339         while (!dma_fence_is_signaled(fence) &&
340                ktime_to_ns(ktime_sub(deadline, ktime_get())) > 0)
341                 ring->funcs->soft_recovery(ring, vmid);
342
343         return dma_fence_is_signaled(fence);
344 }
345
346 /*
347  * Debugfs info
348  */
349 #if defined(CONFIG_DEBUG_FS)
350
351 /* Layout of file is 12 bytes consisting of
352  * - rptr
353  * - wptr
354  * - driver's copy of wptr
355  *
356  * followed by n-words of ring data
357  */
358 static ssize_t amdgpu_debugfs_ring_read(struct file *f, char __user *buf,
359                                         size_t size, loff_t *pos)
360 {
361         struct amdgpu_ring *ring = file_inode(f)->i_private;
362         int r, i;
363         uint32_t value, result, early[3];
364
365         if (*pos & 3 || size & 3)
366                 return -EINVAL;
367
368         result = 0;
369
370         if (*pos < 12) {
371                 early[0] = amdgpu_ring_get_rptr(ring) & ring->buf_mask;
372                 early[1] = amdgpu_ring_get_wptr(ring) & ring->buf_mask;
373                 early[2] = ring->wptr & ring->buf_mask;
374                 for (i = *pos / 4; i < 3 && size; i++) {
375                         r = put_user(early[i], (uint32_t *)buf);
376                         if (r)
377                                 return r;
378                         buf += 4;
379                         result += 4;
380                         size -= 4;
381                         *pos += 4;
382                 }
383         }
384
385         while (size) {
386                 if (*pos >= (ring->ring_size + 12))
387                         return result;
388
389                 value = ring->ring[(*pos - 12)/4];
390                 r = put_user(value, (uint32_t*)buf);
391                 if (r)
392                         return r;
393                 buf += 4;
394                 result += 4;
395                 size -= 4;
396                 *pos += 4;
397         }
398
399         return result;
400 }
401
402 static const struct file_operations amdgpu_debugfs_ring_fops = {
403         .owner = THIS_MODULE,
404         .read = amdgpu_debugfs_ring_read,
405         .llseek = default_llseek
406 };
407
408 #endif
409
410 int amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
411                              struct amdgpu_ring *ring)
412 {
413 #if defined(CONFIG_DEBUG_FS)
414         struct drm_minor *minor = adev->ddev->primary;
415         struct dentry *ent, *root = minor->debugfs_root;
416         char name[32];
417
418         sprintf(name, "amdgpu_ring_%s", ring->name);
419
420         ent = debugfs_create_file(name,
421                                   S_IFREG | S_IRUGO, root,
422                                   ring, &amdgpu_debugfs_ring_fops);
423         if (!ent)
424                 return -ENOMEM;
425
426         i_size_write(ent->d_inode, ring->ring_size + 12);
427         ring->ent = ent;
428 #endif
429         return 0;
430 }
431
432 /**
433  * amdgpu_ring_test_helper - tests ring and set sched readiness status
434  *
435  * @ring: ring to try the recovery on
436  *
437  * Tests ring and set sched readiness status
438  *
439  * Returns 0 on success, error on failure.
440  */
441 int amdgpu_ring_test_helper(struct amdgpu_ring *ring)
442 {
443         struct amdgpu_device *adev = ring->adev;
444         int r;
445
446         r = amdgpu_ring_test_ring(ring);
447         if (r)
448                 DRM_DEV_ERROR(adev->dev, "ring %s test failed (%d)\n",
449                               ring->name, r);
450         else
451                 DRM_DEV_DEBUG(adev->dev, "ring test on %s succeeded\n",
452                               ring->name);
453
454         ring->sched.ready = !r;
455         return r;
456 }
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