1 // SPDX-License-Identifier: (GPL-2.0 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>
20 static ssize_t sof_dfsentry_read(struct file *file, char __user *buffer,
21 size_t count, loff_t *ppos)
23 struct snd_sof_dfsentry *dfse = file->private_data;
24 struct snd_sof_dev *sdev = dfse->sdev;
33 /* validate position & count */
36 if (pos >= size || !count)
38 /* find the minimum. min() is not used since it adds sparse warnings */
39 if (count > size - pos)
42 /* align io read start to u32 multiple */
43 pos = ALIGN_DOWN(pos, 4);
45 /* intermediate buffer size must be u32 multiple */
46 size = ALIGN(count, 4);
48 /* if start position is unaligned, read extra u32 */
49 if (unlikely(pos != *ppos)) {
51 if (pos + size + 4 < dfse->size)
55 buf = kzalloc(size, GFP_KERNEL);
59 if (dfse->type == SOF_DFSENTRY_TYPE_IOMEM) {
60 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
62 * If the DSP is active: copy from IO.
63 * If the DSP is suspended:
64 * - Copy from IO if the memory is always accessible.
65 * - Otherwise, copy from cached buffer.
67 if (pm_runtime_active(sdev->dev) ||
68 dfse->access_type == SOF_DEBUGFS_ACCESS_ALWAYS) {
69 memcpy_fromio(buf, dfse->io_mem + pos, size);
72 "Copying cached debugfs data\n");
73 memcpy(buf, dfse->cache_buf + pos, size);
76 /* if the DSP is in D3 */
77 if (!pm_runtime_active(sdev->dev) &&
78 dfse->access_type == SOF_DEBUGFS_ACCESS_D0_ONLY) {
80 "error: debugfs entry %s cannot be read in DSP D3\n",
81 dfse->dfsentry->d_name.name);
86 memcpy_fromio(buf, dfse->io_mem + pos, size);
89 memcpy(buf, ((u8 *)(dfse->buf) + pos), size);
92 /* copy to userspace */
93 size_ret = copy_to_user(buffer, buf + skip, count);
97 /* update count & position if copy succeeded */
106 static const struct file_operations sof_dfs_fops = {
108 .read = sof_dfsentry_read,
109 .llseek = default_llseek,
112 /* create FS entry for debug files that can expose DSP memories, registers */
113 int snd_sof_debugfs_io_item(struct snd_sof_dev *sdev,
114 void __iomem *base, size_t size,
116 enum sof_debugfs_access_type access_type)
118 struct snd_sof_dfsentry *dfse;
123 dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
127 dfse->type = SOF_DFSENTRY_TYPE_IOMEM;
131 dfse->access_type = access_type;
133 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
135 * allocate cache buffer that will be used to save the mem window
136 * contents prior to suspend
138 if (access_type == SOF_DEBUGFS_ACCESS_D0_ONLY) {
139 dfse->cache_buf = devm_kzalloc(sdev->dev, size, GFP_KERNEL);
140 if (!dfse->cache_buf)
145 dfse->dfsentry = debugfs_create_file(name, 0444, sdev->debugfs_root,
146 dfse, &sof_dfs_fops);
147 if (!dfse->dfsentry) {
148 /* can't rely on debugfs, only log error and keep going */
149 dev_err(sdev->dev, "error: cannot create debugfs entry %s\n",
152 /* add to dfsentry list */
153 list_add(&dfse->list, &sdev->dfsentry_list);
159 EXPORT_SYMBOL_GPL(snd_sof_debugfs_io_item);
161 /* create FS entry for debug files to expose kernel memory */
162 int snd_sof_debugfs_buf_item(struct snd_sof_dev *sdev,
163 void *base, size_t size,
166 struct snd_sof_dfsentry *dfse;
171 dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
175 dfse->type = SOF_DFSENTRY_TYPE_BUF;
180 dfse->dfsentry = debugfs_create_file(name, 0444, sdev->debugfs_root,
181 dfse, &sof_dfs_fops);
182 if (!dfse->dfsentry) {
183 /* can't rely on debugfs, only log error and keep going */
184 dev_err(sdev->dev, "error: cannot create debugfs entry %s\n",
187 /* add to dfsentry list */
188 list_add(&dfse->list, &sdev->dfsentry_list);
193 EXPORT_SYMBOL_GPL(snd_sof_debugfs_buf_item);
195 int snd_sof_dbg_init(struct snd_sof_dev *sdev)
197 const struct snd_sof_dsp_ops *ops = sof_ops(sdev);
198 const struct snd_sof_debugfs_map *map;
202 /* use "sof" as top level debugFS dir */
203 sdev->debugfs_root = debugfs_create_dir("sof", NULL);
204 if (IS_ERR_OR_NULL(sdev->debugfs_root)) {
205 dev_err(sdev->dev, "error: failed to create debugfs directory\n");
209 /* init dfsentry list */
210 INIT_LIST_HEAD(&sdev->dfsentry_list);
212 /* create debugFS files for platform specific MMIO/DSP memories */
213 for (i = 0; i < ops->debug_map_count; i++) {
214 map = &ops->debug_map[i];
216 err = snd_sof_debugfs_io_item(sdev, sdev->bar[map->bar] +
217 map->offset, map->size,
218 map->name, map->access_type);
219 /* errors are only due to memory allocation, not debugfs */
226 EXPORT_SYMBOL_GPL(snd_sof_dbg_init);
228 void snd_sof_free_debug(struct snd_sof_dev *sdev)
230 debugfs_remove_recursive(sdev->debugfs_root);
232 EXPORT_SYMBOL_GPL(snd_sof_free_debug);