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f9cda048 MW |
1 | /* |
2 | * Copyright © 2014-2017 Intel Corporation | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice (including the next | |
12 | * paragraph) shall be included in all copies or substantial portions of the | |
13 | * Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
21 | * IN THE SOFTWARE. | |
22 | * | |
23 | */ | |
d62e2bf3 | 24 | |
f9cda048 MW |
25 | #include <linux/debugfs.h> |
26 | #include <linux/relay.h> | |
d62e2bf3 MW |
27 | |
28 | #include "intel_guc_log.h" | |
f9cda048 MW |
29 | #include "i915_drv.h" |
30 | ||
31 | static void guc_log_capture_logs(struct intel_guc *guc); | |
32 | ||
33 | /** | |
34 | * DOC: GuC firmware log | |
35 | * | |
36 | * Firmware log is enabled by setting i915.guc_log_level to non-negative level. | |
37 | * Log data is printed out via reading debugfs i915_guc_log_dump. Reading from | |
38 | * i915_guc_load_status will print out firmware loading status and scratch | |
39 | * registers value. | |
40 | * | |
41 | */ | |
42 | ||
43 | static int guc_log_flush_complete(struct intel_guc *guc) | |
44 | { | |
45 | u32 action[] = { | |
46 | INTEL_GUC_ACTION_LOG_BUFFER_FILE_FLUSH_COMPLETE | |
47 | }; | |
48 | ||
49 | return intel_guc_send(guc, action, ARRAY_SIZE(action)); | |
50 | } | |
51 | ||
52 | static int guc_log_flush(struct intel_guc *guc) | |
53 | { | |
54 | u32 action[] = { | |
55 | INTEL_GUC_ACTION_FORCE_LOG_BUFFER_FLUSH, | |
56 | 0 | |
57 | }; | |
58 | ||
59 | return intel_guc_send(guc, action, ARRAY_SIZE(action)); | |
60 | } | |
61 | ||
62 | static int guc_log_control(struct intel_guc *guc, u32 control_val) | |
63 | { | |
64 | u32 action[] = { | |
65 | INTEL_GUC_ACTION_UK_LOG_ENABLE_LOGGING, | |
66 | control_val | |
67 | }; | |
68 | ||
69 | return intel_guc_send(guc, action, ARRAY_SIZE(action)); | |
70 | } | |
71 | ||
f9cda048 MW |
72 | /* |
73 | * Sub buffer switch callback. Called whenever relay has to switch to a new | |
74 | * sub buffer, relay stays on the same sub buffer if 0 is returned. | |
75 | */ | |
76 | static int subbuf_start_callback(struct rchan_buf *buf, | |
77 | void *subbuf, | |
78 | void *prev_subbuf, | |
79 | size_t prev_padding) | |
80 | { | |
81 | /* Use no-overwrite mode by default, where relay will stop accepting | |
82 | * new data if there are no empty sub buffers left. | |
83 | * There is no strict synchronization enforced by relay between Consumer | |
84 | * and Producer. In overwrite mode, there is a possibility of getting | |
85 | * inconsistent/garbled data, the producer could be writing on to the | |
86 | * same sub buffer from which Consumer is reading. This can't be avoided | |
87 | * unless Consumer is fast enough and can always run in tandem with | |
88 | * Producer. | |
89 | */ | |
90 | if (relay_buf_full(buf)) | |
91 | return 0; | |
92 | ||
93 | return 1; | |
94 | } | |
95 | ||
96 | /* | |
97 | * file_create() callback. Creates relay file in debugfs. | |
98 | */ | |
99 | static struct dentry *create_buf_file_callback(const char *filename, | |
100 | struct dentry *parent, | |
101 | umode_t mode, | |
102 | struct rchan_buf *buf, | |
103 | int *is_global) | |
104 | { | |
105 | struct dentry *buf_file; | |
106 | ||
107 | /* This to enable the use of a single buffer for the relay channel and | |
108 | * correspondingly have a single file exposed to User, through which | |
109 | * it can collect the logs in order without any post-processing. | |
110 | * Need to set 'is_global' even if parent is NULL for early logging. | |
111 | */ | |
112 | *is_global = 1; | |
113 | ||
114 | if (!parent) | |
115 | return NULL; | |
116 | ||
117 | /* Not using the channel filename passed as an argument, since for each | |
118 | * channel relay appends the corresponding CPU number to the filename | |
119 | * passed in relay_open(). This should be fine as relay just needs a | |
120 | * dentry of the file associated with the channel buffer and that file's | |
121 | * name need not be same as the filename passed as an argument. | |
122 | */ | |
123 | buf_file = debugfs_create_file("guc_log", mode, | |
124 | parent, buf, &relay_file_operations); | |
125 | return buf_file; | |
126 | } | |
127 | ||
128 | /* | |
129 | * file_remove() default callback. Removes relay file in debugfs. | |
130 | */ | |
131 | static int remove_buf_file_callback(struct dentry *dentry) | |
132 | { | |
133 | debugfs_remove(dentry); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | /* relay channel callbacks */ | |
138 | static struct rchan_callbacks relay_callbacks = { | |
139 | .subbuf_start = subbuf_start_callback, | |
140 | .create_buf_file = create_buf_file_callback, | |
141 | .remove_buf_file = remove_buf_file_callback, | |
142 | }; | |
143 | ||
3950bf3d | 144 | static int guc_log_relay_file_create(struct intel_guc *guc) |
f9cda048 MW |
145 | { |
146 | struct drm_i915_private *dev_priv = guc_to_i915(guc); | |
147 | struct dentry *log_dir; | |
148 | int ret; | |
149 | ||
4f044a88 | 150 | if (i915_modparams.guc_log_level < 0) |
3950bf3d OM |
151 | return 0; |
152 | ||
f9cda048 MW |
153 | /* For now create the log file in /sys/kernel/debug/dri/0 dir */ |
154 | log_dir = dev_priv->drm.primary->debugfs_root; | |
155 | ||
156 | /* If /sys/kernel/debug/dri/0 location do not exist, then debugfs is | |
157 | * not mounted and so can't create the relay file. | |
158 | * The relay API seems to fit well with debugfs only, for availing relay | |
159 | * there are 3 requirements which can be met for debugfs file only in a | |
160 | * straightforward/clean manner :- | |
161 | * i) Need the associated dentry pointer of the file, while opening the | |
162 | * relay channel. | |
163 | * ii) Should be able to use 'relay_file_operations' fops for the file. | |
164 | * iii) Set the 'i_private' field of file's inode to the pointer of | |
165 | * relay channel buffer. | |
166 | */ | |
167 | if (!log_dir) { | |
168 | DRM_ERROR("Debugfs dir not available yet for GuC log file\n"); | |
169 | return -ENODEV; | |
170 | } | |
171 | ||
e7465473 | 172 | ret = relay_late_setup_files(guc->log.runtime.relay_chan, "guc_log", log_dir); |
3950bf3d | 173 | if (ret < 0 && ret != -EEXIST) { |
f9cda048 MW |
174 | DRM_ERROR("Couldn't associate relay chan with file %d\n", ret); |
175 | return ret; | |
176 | } | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static void guc_move_to_next_buf(struct intel_guc *guc) | |
182 | { | |
183 | /* Make sure the updates made in the sub buffer are visible when | |
184 | * Consumer sees the following update to offset inside the sub buffer. | |
185 | */ | |
186 | smp_wmb(); | |
187 | ||
188 | /* All data has been written, so now move the offset of sub buffer. */ | |
e7465473 | 189 | relay_reserve(guc->log.runtime.relay_chan, guc->log.vma->obj->base.size); |
f9cda048 MW |
190 | |
191 | /* Switch to the next sub buffer */ | |
e7465473 | 192 | relay_flush(guc->log.runtime.relay_chan); |
f9cda048 MW |
193 | } |
194 | ||
195 | static void *guc_get_write_buffer(struct intel_guc *guc) | |
196 | { | |
e7465473 | 197 | if (!guc->log.runtime.relay_chan) |
f9cda048 MW |
198 | return NULL; |
199 | ||
200 | /* Just get the base address of a new sub buffer and copy data into it | |
201 | * ourselves. NULL will be returned in no-overwrite mode, if all sub | |
202 | * buffers are full. Could have used the relay_write() to indirectly | |
203 | * copy the data, but that would have been bit convoluted, as we need to | |
204 | * write to only certain locations inside a sub buffer which cannot be | |
205 | * done without using relay_reserve() along with relay_write(). So its | |
206 | * better to use relay_reserve() alone. | |
207 | */ | |
e7465473 | 208 | return relay_reserve(guc->log.runtime.relay_chan, 0); |
f9cda048 MW |
209 | } |
210 | ||
211 | static bool guc_check_log_buf_overflow(struct intel_guc *guc, | |
212 | enum guc_log_buffer_type type, | |
213 | unsigned int full_cnt) | |
214 | { | |
215 | unsigned int prev_full_cnt = guc->log.prev_overflow_count[type]; | |
216 | bool overflow = false; | |
217 | ||
218 | if (full_cnt != prev_full_cnt) { | |
219 | overflow = true; | |
220 | ||
221 | guc->log.prev_overflow_count[type] = full_cnt; | |
222 | guc->log.total_overflow_count[type] += full_cnt - prev_full_cnt; | |
223 | ||
224 | if (full_cnt < prev_full_cnt) { | |
225 | /* buffer_full_cnt is a 4 bit counter */ | |
226 | guc->log.total_overflow_count[type] += 16; | |
227 | } | |
228 | DRM_ERROR_RATELIMITED("GuC log buffer overflow\n"); | |
229 | } | |
230 | ||
231 | return overflow; | |
232 | } | |
233 | ||
234 | static unsigned int guc_get_log_buffer_size(enum guc_log_buffer_type type) | |
235 | { | |
236 | switch (type) { | |
237 | case GUC_ISR_LOG_BUFFER: | |
238 | return (GUC_LOG_ISR_PAGES + 1) * PAGE_SIZE; | |
239 | case GUC_DPC_LOG_BUFFER: | |
240 | return (GUC_LOG_DPC_PAGES + 1) * PAGE_SIZE; | |
241 | case GUC_CRASH_DUMP_LOG_BUFFER: | |
242 | return (GUC_LOG_CRASH_PAGES + 1) * PAGE_SIZE; | |
243 | default: | |
244 | MISSING_CASE(type); | |
245 | } | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | static void guc_read_update_log_buffer(struct intel_guc *guc) | |
251 | { | |
252 | unsigned int buffer_size, read_offset, write_offset, bytes_to_copy, full_cnt; | |
253 | struct guc_log_buffer_state *log_buf_state, *log_buf_snapshot_state; | |
254 | struct guc_log_buffer_state log_buf_state_local; | |
255 | enum guc_log_buffer_type type; | |
256 | void *src_data, *dst_data; | |
257 | bool new_overflow; | |
258 | ||
e7465473 | 259 | if (WARN_ON(!guc->log.runtime.buf_addr)) |
f9cda048 MW |
260 | return; |
261 | ||
262 | /* Get the pointer to shared GuC log buffer */ | |
e7465473 | 263 | log_buf_state = src_data = guc->log.runtime.buf_addr; |
f9cda048 MW |
264 | |
265 | /* Get the pointer to local buffer to store the logs */ | |
266 | log_buf_snapshot_state = dst_data = guc_get_write_buffer(guc); | |
267 | ||
268 | /* Actual logs are present from the 2nd page */ | |
269 | src_data += PAGE_SIZE; | |
270 | dst_data += PAGE_SIZE; | |
271 | ||
272 | for (type = GUC_ISR_LOG_BUFFER; type < GUC_MAX_LOG_BUFFER; type++) { | |
273 | /* Make a copy of the state structure, inside GuC log buffer | |
274 | * (which is uncached mapped), on the stack to avoid reading | |
275 | * from it multiple times. | |
276 | */ | |
277 | memcpy(&log_buf_state_local, log_buf_state, | |
278 | sizeof(struct guc_log_buffer_state)); | |
279 | buffer_size = guc_get_log_buffer_size(type); | |
280 | read_offset = log_buf_state_local.read_ptr; | |
281 | write_offset = log_buf_state_local.sampled_write_ptr; | |
282 | full_cnt = log_buf_state_local.buffer_full_cnt; | |
283 | ||
284 | /* Bookkeeping stuff */ | |
285 | guc->log.flush_count[type] += log_buf_state_local.flush_to_file; | |
286 | new_overflow = guc_check_log_buf_overflow(guc, type, full_cnt); | |
287 | ||
288 | /* Update the state of shared log buffer */ | |
289 | log_buf_state->read_ptr = write_offset; | |
290 | log_buf_state->flush_to_file = 0; | |
291 | log_buf_state++; | |
292 | ||
293 | if (unlikely(!log_buf_snapshot_state)) | |
294 | continue; | |
295 | ||
296 | /* First copy the state structure in snapshot buffer */ | |
297 | memcpy(log_buf_snapshot_state, &log_buf_state_local, | |
298 | sizeof(struct guc_log_buffer_state)); | |
299 | ||
300 | /* The write pointer could have been updated by GuC firmware, | |
301 | * after sending the flush interrupt to Host, for consistency | |
302 | * set write pointer value to same value of sampled_write_ptr | |
303 | * in the snapshot buffer. | |
304 | */ | |
305 | log_buf_snapshot_state->write_ptr = write_offset; | |
306 | log_buf_snapshot_state++; | |
307 | ||
308 | /* Now copy the actual logs. */ | |
309 | if (unlikely(new_overflow)) { | |
310 | /* copy the whole buffer in case of overflow */ | |
311 | read_offset = 0; | |
312 | write_offset = buffer_size; | |
313 | } else if (unlikely((read_offset > buffer_size) || | |
314 | (write_offset > buffer_size))) { | |
315 | DRM_ERROR("invalid log buffer state\n"); | |
316 | /* copy whole buffer as offsets are unreliable */ | |
317 | read_offset = 0; | |
318 | write_offset = buffer_size; | |
319 | } | |
320 | ||
321 | /* Just copy the newly written data */ | |
322 | if (read_offset > write_offset) { | |
323 | i915_memcpy_from_wc(dst_data, src_data, write_offset); | |
324 | bytes_to_copy = buffer_size - read_offset; | |
325 | } else { | |
326 | bytes_to_copy = write_offset - read_offset; | |
327 | } | |
328 | i915_memcpy_from_wc(dst_data + read_offset, | |
329 | src_data + read_offset, bytes_to_copy); | |
330 | ||
331 | src_data += buffer_size; | |
332 | dst_data += buffer_size; | |
333 | } | |
334 | ||
335 | if (log_buf_snapshot_state) | |
336 | guc_move_to_next_buf(guc); | |
337 | else { | |
338 | /* Used rate limited to avoid deluge of messages, logs might be | |
339 | * getting consumed by User at a slow rate. | |
340 | */ | |
341 | DRM_ERROR_RATELIMITED("no sub-buffer to capture logs\n"); | |
342 | guc->log.capture_miss_count++; | |
343 | } | |
344 | } | |
345 | ||
f9cda048 MW |
346 | static void capture_logs_work(struct work_struct *work) |
347 | { | |
348 | struct intel_guc *guc = | |
e7465473 | 349 | container_of(work, struct intel_guc, log.runtime.flush_work); |
f9cda048 MW |
350 | |
351 | guc_log_capture_logs(guc); | |
352 | } | |
353 | ||
e7465473 | 354 | static bool guc_log_has_runtime(struct intel_guc *guc) |
3950bf3d | 355 | { |
e7465473 | 356 | return guc->log.runtime.buf_addr != NULL; |
3950bf3d OM |
357 | } |
358 | ||
e7465473 | 359 | static int guc_log_runtime_create(struct intel_guc *guc) |
f9cda048 MW |
360 | { |
361 | struct drm_i915_private *dev_priv = guc_to_i915(guc); | |
362 | void *vaddr; | |
3950bf3d OM |
363 | struct rchan *guc_log_relay_chan; |
364 | size_t n_subbufs, subbuf_size; | |
e22d8e3c | 365 | int ret; |
f9cda048 MW |
366 | |
367 | lockdep_assert_held(&dev_priv->drm.struct_mutex); | |
368 | ||
e7465473 | 369 | GEM_BUG_ON(guc_log_has_runtime(guc)); |
f9cda048 | 370 | |
e22d8e3c CW |
371 | ret = i915_gem_object_set_to_wc_domain(guc->log.vma->obj, true); |
372 | if (ret) | |
373 | return ret; | |
374 | ||
3950bf3d OM |
375 | /* Create a WC (Uncached for read) vmalloc mapping of log |
376 | * buffer pages, so that we can directly get the data | |
377 | * (up-to-date) from memory. | |
378 | */ | |
379 | vaddr = i915_gem_object_pin_map(guc->log.vma->obj, I915_MAP_WC); | |
380 | if (IS_ERR(vaddr)) { | |
381 | DRM_ERROR("Couldn't map log buffer pages %d\n", ret); | |
382 | return PTR_ERR(vaddr); | |
f9cda048 MW |
383 | } |
384 | ||
e7465473 | 385 | guc->log.runtime.buf_addr = vaddr; |
f9cda048 | 386 | |
3950bf3d OM |
387 | /* Keep the size of sub buffers same as shared log buffer */ |
388 | subbuf_size = guc->log.vma->obj->base.size; | |
f9cda048 | 389 | |
3950bf3d OM |
390 | /* Store up to 8 snapshots, which is large enough to buffer sufficient |
391 | * boot time logs and provides enough leeway to User, in terms of | |
392 | * latency, for consuming the logs from relay. Also doesn't take | |
393 | * up too much memory. | |
394 | */ | |
395 | n_subbufs = 8; | |
f9cda048 | 396 | |
3950bf3d OM |
397 | /* Create a relay channel, so that we have buffers for storing |
398 | * the GuC firmware logs, the channel will be linked with a file | |
399 | * later on when debugfs is registered. | |
400 | */ | |
401 | guc_log_relay_chan = relay_open(NULL, NULL, subbuf_size, | |
402 | n_subbufs, &relay_callbacks, dev_priv); | |
403 | if (!guc_log_relay_chan) { | |
404 | DRM_ERROR("Couldn't create relay chan for GuC logging\n"); | |
f9cda048 | 405 | |
3950bf3d OM |
406 | ret = -ENOMEM; |
407 | goto err_vaddr; | |
408 | } | |
f9cda048 | 409 | |
3950bf3d | 410 | GEM_BUG_ON(guc_log_relay_chan->subbuf_size < subbuf_size); |
e7465473 | 411 | guc->log.runtime.relay_chan = guc_log_relay_chan; |
f9cda048 | 412 | |
e7465473 | 413 | INIT_WORK(&guc->log.runtime.flush_work, capture_logs_work); |
3950bf3d OM |
414 | |
415 | /* | |
416 | * GuC log buffer flush work item has to do register access to | |
417 | * send the ack to GuC and this work item, if not synced before | |
418 | * suspend, can potentially get executed after the GFX device is | |
419 | * suspended. | |
420 | * By marking the WQ as freezable, we don't have to bother about | |
421 | * flushing of this work item from the suspend hooks, the pending | |
422 | * work item if any will be either executed before the suspend | |
423 | * or scheduled later on resume. This way the handling of work | |
424 | * item can be kept same between system suspend & rpm suspend. | |
425 | */ | |
e7465473 OM |
426 | guc->log.runtime.flush_wq = alloc_ordered_workqueue("i915-guc_log", |
427 | WQ_HIGHPRI | WQ_FREEZABLE); | |
428 | if (!guc->log.runtime.flush_wq) { | |
3950bf3d OM |
429 | DRM_ERROR("Couldn't allocate the wq for GuC logging\n"); |
430 | ret = -ENOMEM; | |
431 | goto err_relaychan; | |
432 | } | |
f9cda048 | 433 | |
3950bf3d | 434 | return 0; |
f9cda048 | 435 | |
3950bf3d | 436 | err_relaychan: |
e7465473 | 437 | relay_close(guc->log.runtime.relay_chan); |
3950bf3d OM |
438 | err_vaddr: |
439 | i915_gem_object_unpin_map(guc->log.vma->obj); | |
e7465473 | 440 | guc->log.runtime.buf_addr = NULL; |
3950bf3d OM |
441 | return ret; |
442 | } | |
f9cda048 | 443 | |
e7465473 | 444 | static void guc_log_runtime_destroy(struct intel_guc *guc) |
3950bf3d OM |
445 | { |
446 | /* | |
e7465473 OM |
447 | * It's possible that the runtime stuff was never allocated because |
448 | * guc_log_level was < 0 at the time | |
3950bf3d | 449 | **/ |
e7465473 | 450 | if (!guc_log_has_runtime(guc)) |
3950bf3d | 451 | return; |
f9cda048 | 452 | |
e7465473 OM |
453 | destroy_workqueue(guc->log.runtime.flush_wq); |
454 | relay_close(guc->log.runtime.relay_chan); | |
3950bf3d | 455 | i915_gem_object_unpin_map(guc->log.vma->obj); |
e7465473 | 456 | guc->log.runtime.buf_addr = NULL; |
f9cda048 MW |
457 | } |
458 | ||
459 | static int guc_log_late_setup(struct intel_guc *guc) | |
460 | { | |
461 | struct drm_i915_private *dev_priv = guc_to_i915(guc); | |
462 | int ret; | |
463 | ||
464 | lockdep_assert_held(&dev_priv->drm.struct_mutex); | |
465 | ||
e7465473 | 466 | if (!guc_log_has_runtime(guc)) { |
3950bf3d OM |
467 | /* If log_level was set as -1 at boot time, then setup needed to |
468 | * handle log buffer flush interrupts would not have been done yet, | |
469 | * so do that now. | |
470 | */ | |
e7465473 | 471 | ret = guc_log_runtime_create(guc); |
3950bf3d OM |
472 | if (ret) |
473 | goto err; | |
474 | } | |
f9cda048 | 475 | |
3950bf3d | 476 | ret = guc_log_relay_file_create(guc); |
f9cda048 | 477 | if (ret) |
e7465473 | 478 | goto err_runtime; |
f9cda048 MW |
479 | |
480 | return 0; | |
3950bf3d | 481 | |
e7465473 OM |
482 | err_runtime: |
483 | guc_log_runtime_destroy(guc); | |
f9cda048 | 484 | err: |
f9cda048 | 485 | /* logging will remain off */ |
4f044a88 | 486 | i915_modparams.guc_log_level = -1; |
f9cda048 MW |
487 | return ret; |
488 | } | |
489 | ||
490 | static void guc_log_capture_logs(struct intel_guc *guc) | |
491 | { | |
492 | struct drm_i915_private *dev_priv = guc_to_i915(guc); | |
493 | ||
494 | guc_read_update_log_buffer(guc); | |
495 | ||
496 | /* Generally device is expected to be active only at this | |
497 | * time, so get/put should be really quick. | |
498 | */ | |
499 | intel_runtime_pm_get(dev_priv); | |
500 | guc_log_flush_complete(guc); | |
501 | intel_runtime_pm_put(dev_priv); | |
502 | } | |
503 | ||
504 | static void guc_flush_logs(struct intel_guc *guc) | |
505 | { | |
506 | struct drm_i915_private *dev_priv = guc_to_i915(guc); | |
507 | ||
4f044a88 MW |
508 | if (!i915_modparams.enable_guc_submission || |
509 | (i915_modparams.guc_log_level < 0)) | |
f9cda048 MW |
510 | return; |
511 | ||
512 | /* First disable the interrupts, will be renabled afterwards */ | |
513 | gen9_disable_guc_interrupts(dev_priv); | |
514 | ||
515 | /* Before initiating the forceful flush, wait for any pending/ongoing | |
516 | * flush to complete otherwise forceful flush may not actually happen. | |
517 | */ | |
e7465473 | 518 | flush_work(&guc->log.runtime.flush_work); |
f9cda048 MW |
519 | |
520 | /* Ask GuC to update the log buffer state */ | |
521 | guc_log_flush(guc); | |
522 | ||
523 | /* GuC would have updated log buffer by now, so capture it */ | |
524 | guc_log_capture_logs(guc); | |
525 | } | |
526 | ||
3950bf3d OM |
527 | int intel_guc_log_create(struct intel_guc *guc) |
528 | { | |
529 | struct i915_vma *vma; | |
530 | unsigned long offset; | |
faf65486 JL |
531 | u32 flags; |
532 | u32 size; | |
3950bf3d OM |
533 | int ret; |
534 | ||
535 | GEM_BUG_ON(guc->log.vma); | |
536 | ||
4f044a88 MW |
537 | if (i915_modparams.guc_log_level > GUC_LOG_VERBOSITY_MAX) |
538 | i915_modparams.guc_log_level = GUC_LOG_VERBOSITY_MAX; | |
3950bf3d OM |
539 | |
540 | /* The first page is to save log buffer state. Allocate one | |
541 | * extra page for others in case for overlap */ | |
542 | size = (1 + GUC_LOG_DPC_PAGES + 1 + | |
543 | GUC_LOG_ISR_PAGES + 1 + | |
544 | GUC_LOG_CRASH_PAGES + 1) << PAGE_SHIFT; | |
545 | ||
546 | /* We require SSE 4.1 for fast reads from the GuC log buffer and | |
547 | * it should be present on the chipsets supporting GuC based | |
548 | * submisssions. | |
549 | */ | |
550 | if (WARN_ON(!i915_has_memcpy_from_wc())) { | |
551 | ret = -EINVAL; | |
552 | goto err; | |
553 | } | |
554 | ||
555 | vma = intel_guc_allocate_vma(guc, size); | |
556 | if (IS_ERR(vma)) { | |
557 | ret = PTR_ERR(vma); | |
558 | goto err; | |
559 | } | |
560 | ||
561 | guc->log.vma = vma; | |
562 | ||
4f044a88 | 563 | if (i915_modparams.guc_log_level >= 0) { |
e7465473 | 564 | ret = guc_log_runtime_create(guc); |
3950bf3d OM |
565 | if (ret < 0) |
566 | goto err_vma; | |
567 | } | |
568 | ||
569 | /* each allocated unit is a page */ | |
570 | flags = GUC_LOG_VALID | GUC_LOG_NOTIFY_ON_HALF_FULL | | |
571 | (GUC_LOG_DPC_PAGES << GUC_LOG_DPC_SHIFT) | | |
572 | (GUC_LOG_ISR_PAGES << GUC_LOG_ISR_SHIFT) | | |
573 | (GUC_LOG_CRASH_PAGES << GUC_LOG_CRASH_SHIFT); | |
574 | ||
575 | offset = guc_ggtt_offset(vma) >> PAGE_SHIFT; /* in pages */ | |
576 | guc->log.flags = (offset << GUC_LOG_BUF_ADDR_SHIFT) | flags; | |
577 | ||
578 | return 0; | |
579 | ||
580 | err_vma: | |
581 | i915_vma_unpin_and_release(&guc->log.vma); | |
582 | err: | |
583 | /* logging will be off */ | |
4f044a88 | 584 | i915_modparams.guc_log_level = -1; |
3950bf3d OM |
585 | return ret; |
586 | } | |
587 | ||
588 | void intel_guc_log_destroy(struct intel_guc *guc) | |
589 | { | |
e7465473 | 590 | guc_log_runtime_destroy(guc); |
3950bf3d OM |
591 | i915_vma_unpin_and_release(&guc->log.vma); |
592 | } | |
593 | ||
f9cda048 MW |
594 | int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val) |
595 | { | |
596 | struct intel_guc *guc = &dev_priv->guc; | |
597 | ||
598 | union guc_log_control log_param; | |
599 | int ret; | |
600 | ||
601 | log_param.value = control_val; | |
602 | ||
603 | if (log_param.verbosity < GUC_LOG_VERBOSITY_MIN || | |
604 | log_param.verbosity > GUC_LOG_VERBOSITY_MAX) | |
605 | return -EINVAL; | |
606 | ||
607 | /* This combination doesn't make sense & won't have any effect */ | |
4f044a88 | 608 | if (!log_param.logging_enabled && (i915_modparams.guc_log_level < 0)) |
f9cda048 MW |
609 | return 0; |
610 | ||
611 | ret = guc_log_control(guc, log_param.value); | |
612 | if (ret < 0) { | |
613 | DRM_DEBUG_DRIVER("guc_logging_control action failed %d\n", ret); | |
614 | return ret; | |
615 | } | |
616 | ||
3950bf3d | 617 | if (log_param.logging_enabled) { |
4f044a88 | 618 | i915_modparams.guc_log_level = log_param.verbosity; |
f9cda048 | 619 | |
3950bf3d OM |
620 | /* If log_level was set as -1 at boot time, then the relay channel file |
621 | * wouldn't have been created by now and interrupts also would not have | |
622 | * been enabled. Try again now, just in case. | |
623 | */ | |
f9cda048 | 624 | ret = guc_log_late_setup(guc); |
3950bf3d OM |
625 | if (ret < 0) { |
626 | DRM_DEBUG_DRIVER("GuC log late setup failed %d\n", ret); | |
627 | return ret; | |
628 | } | |
629 | ||
630 | /* GuC logging is currently the only user of Guc2Host interrupts */ | |
631 | gen9_enable_guc_interrupts(dev_priv); | |
632 | } else { | |
f9cda048 MW |
633 | /* Once logging is disabled, GuC won't generate logs & send an |
634 | * interrupt. But there could be some data in the log buffer | |
635 | * which is yet to be captured. So request GuC to update the log | |
636 | * buffer state and then collect the left over logs. | |
637 | */ | |
638 | guc_flush_logs(guc); | |
639 | ||
640 | /* As logging is disabled, update log level to reflect that */ | |
4f044a88 | 641 | i915_modparams.guc_log_level = -1; |
f9cda048 MW |
642 | } |
643 | ||
644 | return ret; | |
645 | } | |
646 | ||
647 | void i915_guc_log_register(struct drm_i915_private *dev_priv) | |
648 | { | |
4f044a88 MW |
649 | if (!i915_modparams.enable_guc_submission || |
650 | (i915_modparams.guc_log_level < 0)) | |
f9cda048 MW |
651 | return; |
652 | ||
653 | mutex_lock(&dev_priv->drm.struct_mutex); | |
654 | guc_log_late_setup(&dev_priv->guc); | |
655 | mutex_unlock(&dev_priv->drm.struct_mutex); | |
656 | } | |
657 | ||
658 | void i915_guc_log_unregister(struct drm_i915_private *dev_priv) | |
659 | { | |
4f044a88 | 660 | if (!i915_modparams.enable_guc_submission) |
f9cda048 MW |
661 | return; |
662 | ||
663 | mutex_lock(&dev_priv->drm.struct_mutex); | |
3950bf3d OM |
664 | /* GuC logging is currently the only user of Guc2Host interrupts */ |
665 | gen9_disable_guc_interrupts(dev_priv); | |
e7465473 | 666 | guc_log_runtime_destroy(&dev_priv->guc); |
f9cda048 MW |
667 | mutex_unlock(&dev_priv->drm.struct_mutex); |
668 | } |