Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[platform/kernel/linux-starfive.git] / sound / soc / sof / debug.c
1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
2 //
3 // This file is provided under a dual BSD/GPLv2 license.  When using or
4 // redistributing this file, you may do so under either license.
5 //
6 // Copyright(c) 2018 Intel Corporation. All rights reserved.
7 //
8 // Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
9 //
10 // Generic debug routines used to export DSP MMIO and memories to userspace
11 // for firmware debugging.
12 //
13
14 #include <linux/debugfs.h>
15 #include <linux/io.h>
16 #include <linux/pm_runtime.h>
17 #include <sound/sof/ext_manifest.h>
18 #include <sound/sof/debug.h>
19 #include "sof-priv.h"
20 #include "ops.h"
21
22 static ssize_t sof_dfsentry_write(struct file *file, const char __user *buffer,
23                                   size_t count, loff_t *ppos)
24 {
25         size_t size;
26         char *string;
27         int ret;
28
29         string = kzalloc(count+1, GFP_KERNEL);
30         if (!string)
31                 return -ENOMEM;
32
33         size = simple_write_to_buffer(string, count, ppos, buffer, count);
34         ret = size;
35
36         kfree(string);
37         return ret;
38 }
39
40 static ssize_t sof_dfsentry_read(struct file *file, char __user *buffer,
41                                  size_t count, loff_t *ppos)
42 {
43         struct snd_sof_dfsentry *dfse = file->private_data;
44         struct snd_sof_dev *sdev = dfse->sdev;
45         loff_t pos = *ppos;
46         size_t size_ret;
47         int skip = 0;
48         int size;
49         u8 *buf;
50
51         size = dfse->size;
52
53         /* validate position & count */
54         if (pos < 0)
55                 return -EINVAL;
56         if (pos >= size || !count)
57                 return 0;
58         /* find the minimum. min() is not used since it adds sparse warnings */
59         if (count > size - pos)
60                 count = size - pos;
61
62         /* align io read start to u32 multiple */
63         pos = ALIGN_DOWN(pos, 4);
64
65         /* intermediate buffer size must be u32 multiple */
66         size = ALIGN(count, 4);
67
68         /* if start position is unaligned, read extra u32 */
69         if (unlikely(pos != *ppos)) {
70                 skip = *ppos - pos;
71                 if (pos + size + 4 < dfse->size)
72                         size += 4;
73         }
74
75         buf = kzalloc(size, GFP_KERNEL);
76         if (!buf)
77                 return -ENOMEM;
78
79         if (dfse->type == SOF_DFSENTRY_TYPE_IOMEM) {
80 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
81                 /*
82                  * If the DSP is active: copy from IO.
83                  * If the DSP is suspended:
84                  *      - Copy from IO if the memory is always accessible.
85                  *      - Otherwise, copy from cached buffer.
86                  */
87                 if (pm_runtime_active(sdev->dev) ||
88                     dfse->access_type == SOF_DEBUGFS_ACCESS_ALWAYS) {
89                         memcpy_fromio(buf, dfse->io_mem + pos, size);
90                 } else {
91                         dev_info(sdev->dev,
92                                  "Copying cached debugfs data\n");
93                         memcpy(buf, dfse->cache_buf + pos, size);
94                 }
95 #else
96                 /* if the DSP is in D3 */
97                 if (!pm_runtime_active(sdev->dev) &&
98                     dfse->access_type == SOF_DEBUGFS_ACCESS_D0_ONLY) {
99                         dev_err(sdev->dev,
100                                 "error: debugfs entry cannot be read in DSP D3\n");
101                         kfree(buf);
102                         return -EINVAL;
103                 }
104
105                 memcpy_fromio(buf, dfse->io_mem + pos, size);
106 #endif
107         } else {
108                 memcpy(buf, ((u8 *)(dfse->buf) + pos), size);
109         }
110
111         /* copy to userspace */
112         size_ret = copy_to_user(buffer, buf + skip, count);
113
114         kfree(buf);
115
116         /* update count & position if copy succeeded */
117         if (size_ret)
118                 return -EFAULT;
119
120         *ppos = pos + count;
121
122         return count;
123 }
124
125 static const struct file_operations sof_dfs_fops = {
126         .open = simple_open,
127         .read = sof_dfsentry_read,
128         .llseek = default_llseek,
129         .write = sof_dfsentry_write,
130 };
131
132 /* create FS entry for debug files that can expose DSP memories, registers */
133 static int snd_sof_debugfs_io_item(struct snd_sof_dev *sdev,
134                                    void __iomem *base, size_t size,
135                                    const char *name,
136                                    enum sof_debugfs_access_type access_type)
137 {
138         struct snd_sof_dfsentry *dfse;
139
140         if (!sdev)
141                 return -EINVAL;
142
143         dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
144         if (!dfse)
145                 return -ENOMEM;
146
147         dfse->type = SOF_DFSENTRY_TYPE_IOMEM;
148         dfse->io_mem = base;
149         dfse->size = size;
150         dfse->sdev = sdev;
151         dfse->access_type = access_type;
152
153 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
154         /*
155          * allocate cache buffer that will be used to save the mem window
156          * contents prior to suspend
157          */
158         if (access_type == SOF_DEBUGFS_ACCESS_D0_ONLY) {
159                 dfse->cache_buf = devm_kzalloc(sdev->dev, size, GFP_KERNEL);
160                 if (!dfse->cache_buf)
161                         return -ENOMEM;
162         }
163 #endif
164
165         debugfs_create_file(name, 0444, sdev->debugfs_root, dfse,
166                             &sof_dfs_fops);
167
168         /* add to dfsentry list */
169         list_add(&dfse->list, &sdev->dfsentry_list);
170
171         return 0;
172 }
173
174 int snd_sof_debugfs_add_region_item_iomem(struct snd_sof_dev *sdev,
175                                           enum snd_sof_fw_blk_type blk_type, u32 offset,
176                                           size_t size, const char *name,
177                                           enum sof_debugfs_access_type access_type)
178 {
179         int bar = snd_sof_dsp_get_bar_index(sdev, blk_type);
180
181         if (bar < 0)
182                 return bar;
183
184         return snd_sof_debugfs_io_item(sdev, sdev->bar[bar] + offset, size, name,
185                                        access_type);
186 }
187 EXPORT_SYMBOL_GPL(snd_sof_debugfs_add_region_item_iomem);
188
189 /* create FS entry for debug files to expose kernel memory */
190 int snd_sof_debugfs_buf_item(struct snd_sof_dev *sdev,
191                              void *base, size_t size,
192                              const char *name, mode_t mode)
193 {
194         struct snd_sof_dfsentry *dfse;
195
196         if (!sdev)
197                 return -EINVAL;
198
199         dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
200         if (!dfse)
201                 return -ENOMEM;
202
203         dfse->type = SOF_DFSENTRY_TYPE_BUF;
204         dfse->buf = base;
205         dfse->size = size;
206         dfse->sdev = sdev;
207
208         debugfs_create_file(name, mode, sdev->debugfs_root, dfse,
209                             &sof_dfs_fops);
210         /* add to dfsentry list */
211         list_add(&dfse->list, &sdev->dfsentry_list);
212
213         return 0;
214 }
215 EXPORT_SYMBOL_GPL(snd_sof_debugfs_buf_item);
216
217 static int memory_info_update(struct snd_sof_dev *sdev, char *buf, size_t buff_size)
218 {
219         struct sof_ipc_cmd_hdr msg = {
220                 .size = sizeof(struct sof_ipc_cmd_hdr),
221                 .cmd = SOF_IPC_GLB_DEBUG | SOF_IPC_DEBUG_MEM_USAGE,
222         };
223         struct sof_ipc_dbg_mem_usage *reply;
224         int len;
225         int ret;
226         int i;
227
228         reply = kmalloc(SOF_IPC_MSG_MAX_SIZE, GFP_KERNEL);
229         if (!reply)
230                 return -ENOMEM;
231
232         ret = pm_runtime_resume_and_get(sdev->dev);
233         if (ret < 0 && ret != -EACCES) {
234                 dev_err(sdev->dev, "error: enabling device failed: %d\n", ret);
235                 goto error;
236         }
237
238         ret = sof_ipc_tx_message(sdev->ipc, &msg, msg.size, reply, SOF_IPC_MSG_MAX_SIZE);
239         pm_runtime_mark_last_busy(sdev->dev);
240         pm_runtime_put_autosuspend(sdev->dev);
241         if (ret < 0 || reply->rhdr.error < 0) {
242                 ret = min(ret, reply->rhdr.error);
243                 dev_err(sdev->dev, "error: reading memory info failed, %d\n", ret);
244                 goto error;
245         }
246
247         if (struct_size(reply, elems, reply->num_elems) != reply->rhdr.hdr.size) {
248                 dev_err(sdev->dev, "error: invalid memory info ipc struct size, %d\n",
249                         reply->rhdr.hdr.size);
250                 ret = -EINVAL;
251                 goto error;
252         }
253
254         for (i = 0, len = 0; i < reply->num_elems; i++) {
255                 ret = snprintf(buf + len, buff_size - len, "zone %d.%d used %#8x free %#8x\n",
256                                reply->elems[i].zone, reply->elems[i].id,
257                                reply->elems[i].used, reply->elems[i].free);
258                 if (ret < 0)
259                         goto error;
260                 len += ret;
261         }
262
263         ret = len;
264 error:
265         kfree(reply);
266         return ret;
267 }
268
269 static ssize_t memory_info_read(struct file *file, char __user *to, size_t count, loff_t *ppos)
270 {
271         struct snd_sof_dfsentry *dfse = file->private_data;
272         struct snd_sof_dev *sdev = dfse->sdev;
273         int data_length;
274
275         /* read memory info from FW only once for each file read */
276         if (!*ppos) {
277                 dfse->buf_data_size = 0;
278                 data_length = memory_info_update(sdev, dfse->buf, dfse->size);
279                 if (data_length < 0)
280                         return data_length;
281                 dfse->buf_data_size = data_length;
282         }
283
284         return simple_read_from_buffer(to, count, ppos, dfse->buf, dfse->buf_data_size);
285 }
286
287 static int memory_info_open(struct inode *inode, struct file *file)
288 {
289         struct snd_sof_dfsentry *dfse = inode->i_private;
290         struct snd_sof_dev *sdev = dfse->sdev;
291
292         file->private_data = dfse;
293
294         /* allocate buffer memory only in first open run, to save memory when unused */
295         if (!dfse->buf) {
296                 dfse->buf = devm_kmalloc(sdev->dev, PAGE_SIZE, GFP_KERNEL);
297                 if (!dfse->buf)
298                         return -ENOMEM;
299                 dfse->size = PAGE_SIZE;
300         }
301
302         return 0;
303 }
304
305 static const struct file_operations memory_info_fops = {
306         .open = memory_info_open,
307         .read = memory_info_read,
308         .llseek = default_llseek,
309 };
310
311 int snd_sof_dbg_memory_info_init(struct snd_sof_dev *sdev)
312 {
313         struct snd_sof_dfsentry *dfse;
314
315         dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
316         if (!dfse)
317                 return -ENOMEM;
318
319         /* don't allocate buffer before first usage, to save memory when unused */
320         dfse->type = SOF_DFSENTRY_TYPE_BUF;
321         dfse->sdev = sdev;
322
323         debugfs_create_file("memory_info", 0444, sdev->debugfs_root, dfse, &memory_info_fops);
324
325         /* add to dfsentry list */
326         list_add(&dfse->list, &sdev->dfsentry_list);
327         return 0;
328 }
329 EXPORT_SYMBOL_GPL(snd_sof_dbg_memory_info_init);
330
331 int snd_sof_dbg_init(struct snd_sof_dev *sdev)
332 {
333         struct snd_sof_dsp_ops *ops = sof_ops(sdev);
334         const struct snd_sof_debugfs_map *map;
335         int i;
336         int err;
337
338         /* use "sof" as top level debugFS dir */
339         sdev->debugfs_root = debugfs_create_dir("sof", NULL);
340
341         /* init dfsentry list */
342         INIT_LIST_HEAD(&sdev->dfsentry_list);
343
344         /* create debugFS files for platform specific MMIO/DSP memories */
345         for (i = 0; i < ops->debug_map_count; i++) {
346                 map = &ops->debug_map[i];
347
348                 err = snd_sof_debugfs_io_item(sdev, sdev->bar[map->bar] +
349                                               map->offset, map->size,
350                                               map->name, map->access_type);
351                 /* errors are only due to memory allocation, not debugfs */
352                 if (err < 0)
353                         return err;
354         }
355
356         return 0;
357 }
358 EXPORT_SYMBOL_GPL(snd_sof_dbg_init);
359
360 void snd_sof_free_debug(struct snd_sof_dev *sdev)
361 {
362         debugfs_remove_recursive(sdev->debugfs_root);
363 }
364 EXPORT_SYMBOL_GPL(snd_sof_free_debug);
365
366 static const struct soc_fw_state_info {
367         enum sof_fw_state state;
368         const char *name;
369 } fw_state_dbg[] = {
370         {SOF_FW_BOOT_NOT_STARTED, "SOF_FW_BOOT_NOT_STARTED"},
371         {SOF_FW_BOOT_PREPARE, "SOF_FW_BOOT_PREPARE"},
372         {SOF_FW_BOOT_IN_PROGRESS, "SOF_FW_BOOT_IN_PROGRESS"},
373         {SOF_FW_BOOT_FAILED, "SOF_FW_BOOT_FAILED"},
374         {SOF_FW_BOOT_READY_FAILED, "SOF_FW_BOOT_READY_FAILED"},
375         {SOF_FW_BOOT_READY_OK, "SOF_FW_BOOT_READY_OK"},
376         {SOF_FW_BOOT_COMPLETE, "SOF_FW_BOOT_COMPLETE"},
377         {SOF_FW_CRASHED, "SOF_FW_CRASHED"},
378 };
379
380 static void snd_sof_dbg_print_fw_state(struct snd_sof_dev *sdev, const char *level)
381 {
382         int i;
383
384         for (i = 0; i < ARRAY_SIZE(fw_state_dbg); i++) {
385                 if (sdev->fw_state == fw_state_dbg[i].state) {
386                         dev_printk(level, sdev->dev, "fw_state: %s (%d)\n",
387                                    fw_state_dbg[i].name, i);
388                         return;
389                 }
390         }
391
392         dev_printk(level, sdev->dev, "fw_state: UNKNOWN (%d)\n", sdev->fw_state);
393 }
394
395 void snd_sof_dsp_dbg_dump(struct snd_sof_dev *sdev, const char *msg, u32 flags)
396 {
397         char *level = (flags & SOF_DBG_DUMP_OPTIONAL) ? KERN_DEBUG : KERN_ERR;
398         bool print_all = sof_debug_check_flag(SOF_DBG_PRINT_ALL_DUMPS);
399
400         if (flags & SOF_DBG_DUMP_OPTIONAL && !print_all)
401                 return;
402
403         if (sof_ops(sdev)->dbg_dump && !sdev->dbg_dump_printed) {
404                 dev_printk(level, sdev->dev,
405                            "------------[ DSP dump start ]------------\n");
406                 if (msg)
407                         dev_printk(level, sdev->dev, "%s\n", msg);
408                 snd_sof_dbg_print_fw_state(sdev, level);
409                 sof_ops(sdev)->dbg_dump(sdev, flags);
410                 dev_printk(level, sdev->dev,
411                            "------------[ DSP dump end ]------------\n");
412                 if (!print_all)
413                         sdev->dbg_dump_printed = true;
414         } else if (msg) {
415                 dev_printk(level, sdev->dev, "%s\n", msg);
416         }
417 }
418 EXPORT_SYMBOL(snd_sof_dsp_dbg_dump);
419
420 static void snd_sof_ipc_dump(struct snd_sof_dev *sdev)
421 {
422         if (sof_ops(sdev)->ipc_dump  && !sdev->ipc_dump_printed) {
423                 dev_err(sdev->dev, "------------[ IPC dump start ]------------\n");
424                 sof_ops(sdev)->ipc_dump(sdev);
425                 dev_err(sdev->dev, "------------[ IPC dump end ]------------\n");
426                 if (!sof_debug_check_flag(SOF_DBG_PRINT_ALL_DUMPS))
427                         sdev->ipc_dump_printed = true;
428         }
429 }
430
431 void snd_sof_handle_fw_exception(struct snd_sof_dev *sdev, const char *msg)
432 {
433         if (IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_RETAIN_DSP_CONTEXT) ||
434             sof_debug_check_flag(SOF_DBG_RETAIN_CTX)) {
435                 /* should we prevent DSP entering D3 ? */
436                 if (!sdev->ipc_dump_printed)
437                         dev_info(sdev->dev,
438                                  "preventing DSP entering D3 state to preserve context\n");
439                 pm_runtime_get_noresume(sdev->dev);
440         }
441
442         /* dump vital information to the logs */
443         snd_sof_ipc_dump(sdev);
444         snd_sof_dsp_dbg_dump(sdev, msg, SOF_DBG_DUMP_REGS | SOF_DBG_DUMP_MBOX);
445         sof_fw_trace_fw_crashed(sdev);
446 }
447 EXPORT_SYMBOL(snd_sof_handle_fw_exception);