1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
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.
6 // Copyright(c) 2018 Intel Corporation. All rights reserved.
8 // Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
10 // Generic debug routines used to export DSP MMIO and memories to userspace
11 // for firmware debugging.
14 #include <linux/debugfs.h>
16 #include <linux/pm_runtime.h>
17 #include <sound/sof/ext_manifest.h>
18 #include <sound/sof/debug.h>
22 static ssize_t sof_dfsentry_write(struct file *file, const char __user *buffer,
23 size_t count, loff_t *ppos)
29 string = kzalloc(count+1, GFP_KERNEL);
33 size = simple_write_to_buffer(string, count, ppos, buffer, count);
40 static ssize_t sof_dfsentry_read(struct file *file, char __user *buffer,
41 size_t count, loff_t *ppos)
43 struct snd_sof_dfsentry *dfse = file->private_data;
44 struct snd_sof_dev *sdev = dfse->sdev;
53 /* validate position & count */
56 if (pos >= size || !count)
58 /* find the minimum. min() is not used since it adds sparse warnings */
59 if (count > size - pos)
62 /* align io read start to u32 multiple */
63 pos = ALIGN_DOWN(pos, 4);
65 /* intermediate buffer size must be u32 multiple */
66 size = ALIGN(count, 4);
68 /* if start position is unaligned, read extra u32 */
69 if (unlikely(pos != *ppos)) {
71 if (pos + size + 4 < dfse->size)
75 buf = kzalloc(size, GFP_KERNEL);
79 if (dfse->type == SOF_DFSENTRY_TYPE_IOMEM) {
80 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
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.
87 if (pm_runtime_active(sdev->dev) ||
88 dfse->access_type == SOF_DEBUGFS_ACCESS_ALWAYS) {
89 memcpy_fromio(buf, dfse->io_mem + pos, size);
92 "Copying cached debugfs data\n");
93 memcpy(buf, dfse->cache_buf + pos, size);
96 /* if the DSP is in D3 */
97 if (!pm_runtime_active(sdev->dev) &&
98 dfse->access_type == SOF_DEBUGFS_ACCESS_D0_ONLY) {
100 "error: debugfs entry cannot be read in DSP D3\n");
105 memcpy_fromio(buf, dfse->io_mem + pos, size);
108 memcpy(buf, ((u8 *)(dfse->buf) + pos), size);
111 /* copy to userspace */
112 size_ret = copy_to_user(buffer, buf + skip, count);
116 /* update count & position if copy succeeded */
125 static const struct file_operations sof_dfs_fops = {
127 .read = sof_dfsentry_read,
128 .llseek = default_llseek,
129 .write = sof_dfsentry_write,
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,
136 enum sof_debugfs_access_type access_type)
138 struct snd_sof_dfsentry *dfse;
143 dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
147 dfse->type = SOF_DFSENTRY_TYPE_IOMEM;
151 dfse->access_type = access_type;
153 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
155 * allocate cache buffer that will be used to save the mem window
156 * contents prior to suspend
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)
165 debugfs_create_file(name, 0444, sdev->debugfs_root, dfse,
168 /* add to dfsentry list */
169 list_add(&dfse->list, &sdev->dfsentry_list);
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)
179 int bar = snd_sof_dsp_get_bar_index(sdev, blk_type);
184 return snd_sof_debugfs_io_item(sdev, sdev->bar[bar] + offset, size, name,
187 EXPORT_SYMBOL_GPL(snd_sof_debugfs_add_region_item_iomem);
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)
194 struct snd_sof_dfsentry *dfse;
199 dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
203 dfse->type = SOF_DFSENTRY_TYPE_BUF;
208 debugfs_create_file(name, mode, sdev->debugfs_root, dfse,
210 /* add to dfsentry list */
211 list_add(&dfse->list, &sdev->dfsentry_list);
215 EXPORT_SYMBOL_GPL(snd_sof_debugfs_buf_item);
217 static int memory_info_update(struct snd_sof_dev *sdev, char *buf, size_t buff_size)
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,
223 struct sof_ipc_dbg_mem_usage *reply;
228 reply = kmalloc(SOF_IPC_MSG_MAX_SIZE, GFP_KERNEL);
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);
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);
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);
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);
269 static ssize_t memory_info_read(struct file *file, char __user *to, size_t count, loff_t *ppos)
271 struct snd_sof_dfsentry *dfse = file->private_data;
272 struct snd_sof_dev *sdev = dfse->sdev;
275 /* read memory info from FW only once for each file read */
277 dfse->buf_data_size = 0;
278 data_length = memory_info_update(sdev, dfse->buf, dfse->size);
281 dfse->buf_data_size = data_length;
284 return simple_read_from_buffer(to, count, ppos, dfse->buf, dfse->buf_data_size);
287 static int memory_info_open(struct inode *inode, struct file *file)
289 struct snd_sof_dfsentry *dfse = inode->i_private;
290 struct snd_sof_dev *sdev = dfse->sdev;
292 file->private_data = dfse;
294 /* allocate buffer memory only in first open run, to save memory when unused */
296 dfse->buf = devm_kmalloc(sdev->dev, PAGE_SIZE, GFP_KERNEL);
299 dfse->size = PAGE_SIZE;
305 static const struct file_operations memory_info_fops = {
306 .open = memory_info_open,
307 .read = memory_info_read,
308 .llseek = default_llseek,
311 int snd_sof_dbg_memory_info_init(struct snd_sof_dev *sdev)
313 struct snd_sof_dfsentry *dfse;
315 dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
319 /* don't allocate buffer before first usage, to save memory when unused */
320 dfse->type = SOF_DFSENTRY_TYPE_BUF;
323 debugfs_create_file("memory_info", 0444, sdev->debugfs_root, dfse, &memory_info_fops);
325 /* add to dfsentry list */
326 list_add(&dfse->list, &sdev->dfsentry_list);
329 EXPORT_SYMBOL_GPL(snd_sof_dbg_memory_info_init);
331 int snd_sof_dbg_init(struct snd_sof_dev *sdev)
333 struct snd_sof_dsp_ops *ops = sof_ops(sdev);
334 const struct snd_sof_debugfs_map *map;
338 /* use "sof" as top level debugFS dir */
339 sdev->debugfs_root = debugfs_create_dir("sof", NULL);
341 /* init dfsentry list */
342 INIT_LIST_HEAD(&sdev->dfsentry_list);
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];
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 */
358 EXPORT_SYMBOL_GPL(snd_sof_dbg_init);
360 void snd_sof_free_debug(struct snd_sof_dev *sdev)
362 debugfs_remove_recursive(sdev->debugfs_root);
364 EXPORT_SYMBOL_GPL(snd_sof_free_debug);
366 static const struct soc_fw_state_info {
367 enum sof_fw_state state;
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"},
380 static void snd_sof_dbg_print_fw_state(struct snd_sof_dev *sdev, const char *level)
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);
392 dev_printk(level, sdev->dev, "fw_state: UNKNOWN (%d)\n", sdev->fw_state);
395 void snd_sof_dsp_dbg_dump(struct snd_sof_dev *sdev, const char *msg, u32 flags)
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);
400 if (flags & SOF_DBG_DUMP_OPTIONAL && !print_all)
403 if (sof_ops(sdev)->dbg_dump && !sdev->dbg_dump_printed) {
404 dev_printk(level, sdev->dev,
405 "------------[ DSP dump start ]------------\n");
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");
413 sdev->dbg_dump_printed = true;
415 dev_printk(level, sdev->dev, "%s\n", msg);
418 EXPORT_SYMBOL(snd_sof_dsp_dbg_dump);
420 static void snd_sof_ipc_dump(struct snd_sof_dev *sdev)
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;
431 void snd_sof_handle_fw_exception(struct snd_sof_dev *sdev, const char *msg)
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)
438 "preventing DSP entering D3 state to preserve context\n");
439 pm_runtime_get_noresume(sdev->dev);
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);
447 EXPORT_SYMBOL(snd_sof_handle_fw_exception);