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// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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// This file is provided under a dual BSD/GPLv2 license. When using or
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// redistributing this file, you may do so under either license.
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// Copyright(c) 2018 Intel Corporation. All rights reserved.
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// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
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// Generic debug routines used to export DSP MMIO and memories to userspace
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// for firmware debugging.
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#include <linux/debugfs.h>
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#include <linux/pm_runtime.h>
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#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
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#define MAX_IPC_FLOOD_DURATION_MS 1000
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#define MAX_IPC_FLOOD_COUNT 10000
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#define IPC_FLOOD_TEST_RESULT_LEN 512
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static int sof_debug_ipc_flood_test(struct snd_sof_dev *sdev,
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struct snd_sof_dfsentry *dfse,
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bool flood_duration_test,
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unsigned long ipc_duration_ms,
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unsigned long ipc_count)
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struct sof_ipc_cmd_hdr hdr;
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struct sof_ipc_reply reply;
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u64 min_response_time = U64_MAX;
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ktime_t start, end, test_end;
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u64 avg_response_time = 0;
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u64 max_response_time = 0;
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u64 ipc_response_time;
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/* configure test IPC */
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hdr.cmd = SOF_IPC_GLB_TEST_MSG | SOF_IPC_TEST_IPC_FLOOD;
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hdr.size = sizeof(hdr);
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/* set test end time for duration flood test */
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if (flood_duration_test)
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test_end = ktime_get_ns() + ipc_duration_ms * NSEC_PER_MSEC;
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ret = sof_ipc_tx_message(sdev->ipc, hdr.cmd, &hdr, hdr.size,
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&reply, sizeof(reply));
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/* compute min and max response times */
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ipc_response_time = ktime_to_ns(ktime_sub(end, start));
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min_response_time = min(min_response_time, ipc_response_time);
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max_response_time = max(max_response_time, ipc_response_time);
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/* sum up response times */
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avg_response_time += ipc_response_time;
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if (flood_duration_test) {
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if (ktime_to_ns(end) >= test_end)
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"error: ipc flood test failed at %d iterations\n", i);
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/* return if the first IPC fails */
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/* compute average response time */
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do_div(avg_response_time, i);
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/* clear previous test output */
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memset(dfse->cache_buf, 0, IPC_FLOOD_TEST_RESULT_LEN);
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if (flood_duration_test) {
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dev_dbg(sdev->dev, "IPC Flood test duration: %lums\n",
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snprintf(dfse->cache_buf, IPC_FLOOD_TEST_RESULT_LEN,
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"IPC Flood test duration: %lums\n", ipc_duration_ms);
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"IPC Flood count: %d, Avg response time: %lluns\n",
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i, avg_response_time);
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dev_dbg(sdev->dev, "Max response time: %lluns\n",
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dev_dbg(sdev->dev, "Min response time: %lluns\n",
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/* format output string */
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snprintf(dfse->cache_buf + strlen(dfse->cache_buf),
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IPC_FLOOD_TEST_RESULT_LEN - strlen(dfse->cache_buf),
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"IPC Flood count: %d\nAvg response time: %lluns\n",
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i, avg_response_time);
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snprintf(dfse->cache_buf + strlen(dfse->cache_buf),
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IPC_FLOOD_TEST_RESULT_LEN - strlen(dfse->cache_buf),
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"Max response time: %lluns\nMin response time: %lluns\n",
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max_response_time, min_response_time);
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static ssize_t sof_dfsentry_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *ppos)
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#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
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struct snd_sof_dfsentry *dfse = file->private_data;
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struct snd_sof_dev *sdev = dfse->sdev;
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unsigned long ipc_duration_ms = 0;
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bool flood_duration_test = false;
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unsigned long ipc_count = 0;
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struct dentry *dentry;
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string = kzalloc(count, GFP_KERNEL);
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size = simple_write_to_buffer(string, count, ppos, buffer, count);
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#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
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* write op is only supported for ipc_flood_count or
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* ipc_flood_duration_ms debugfs entries atm.
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* ipc_flood_count floods the DSP with the number of IPC's specified.
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* ipc_duration_ms test floods the DSP for the time specified
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* in the debugfs entry.
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dentry = file->f_path.dentry;
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if (strcmp(dentry->d_name.name, "ipc_flood_count") &&
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strcmp(dentry->d_name.name, "ipc_flood_duration_ms")) {
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if (!strcmp(dentry->d_name.name, "ipc_flood_duration_ms"))
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flood_duration_test = true;
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/* test completion criterion */
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if (flood_duration_test)
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ret = kstrtoul(string, 0, &ipc_duration_ms);
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ret = kstrtoul(string, 0, &ipc_count);
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/* limit max duration/ipc count for flood test */
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if (flood_duration_test) {
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if (!ipc_duration_ms) {
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/* find the minimum. min() is not used to avoid warnings */
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if (ipc_duration_ms > MAX_IPC_FLOOD_DURATION_MS)
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ipc_duration_ms = MAX_IPC_FLOOD_DURATION_MS;
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/* find the minimum. min() is not used to avoid warnings */
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if (ipc_count > MAX_IPC_FLOOD_COUNT)
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ipc_count = MAX_IPC_FLOOD_COUNT;
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ret = pm_runtime_get_sync(sdev->dev);
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dev_err_ratelimited(sdev->dev,
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"error: debugfs write failed to resume %d\n",
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pm_runtime_put_noidle(sdev->dev);
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ret = sof_debug_ipc_flood_test(sdev, dfse, flood_duration_test,
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ipc_duration_ms, ipc_count);
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pm_runtime_mark_last_busy(sdev->dev);
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err = pm_runtime_put_autosuspend(sdev->dev);
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dev_err_ratelimited(sdev->dev,
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"error: debugfs write failed to idle %d\n",
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/* return size if test is successful */
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static ssize_t sof_dfsentry_read(struct file *file, char __user *buffer,
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size_t count, loff_t *ppos)
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struct snd_sof_dfsentry *dfse = file->private_data;
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struct snd_sof_dev *sdev = dfse->sdev;
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#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
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struct dentry *dentry;
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dentry = file->f_path.dentry;
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if ((!strcmp(dentry->d_name.name, "ipc_flood_count") ||
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!strcmp(dentry->d_name.name, "ipc_flood_duration_ms")) &&
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count = strlen(dfse->cache_buf);
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size_ret = copy_to_user(buffer, dfse->cache_buf, count);
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/* validate position & count */
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if (pos >= size || !count)
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/* find the minimum. min() is not used since it adds sparse warnings */
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if (count > size - pos)
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/* align io read start to u32 multiple */
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pos = ALIGN_DOWN(pos, 4);
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/* intermediate buffer size must be u32 multiple */
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size = ALIGN(count, 4);
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/* if start position is unaligned, read extra u32 */
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if (unlikely(pos != *ppos)) {
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if (pos + size + 4 < dfse->size)
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buf = kzalloc(size, GFP_KERNEL);
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if (dfse->type == SOF_DFSENTRY_TYPE_IOMEM) {
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#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
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* If the DSP is active: copy from IO.
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* If the DSP is suspended:
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* - Copy from IO if the memory is always accessible.
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* - Otherwise, copy from cached buffer.
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if (pm_runtime_active(sdev->dev) ||
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dfse->access_type == SOF_DEBUGFS_ACCESS_ALWAYS) {
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memcpy_fromio(buf, dfse->io_mem + pos, size);
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"Copying cached debugfs data\n");
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memcpy(buf, dfse->cache_buf + pos, size);
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/* if the DSP is in D3 */
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if (!pm_runtime_active(sdev->dev) &&
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dfse->access_type == SOF_DEBUGFS_ACCESS_D0_ONLY) {
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"error: debugfs entry cannot be read in DSP D3\n");
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memcpy_fromio(buf, dfse->io_mem + pos, size);
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memcpy(buf, ((u8 *)(dfse->buf) + pos), size);
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/* copy to userspace */
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size_ret = copy_to_user(buffer, buf + skip, count);
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/* update count & position if copy succeeded */
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static const struct file_operations sof_dfs_fops = {
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.read = sof_dfsentry_read,
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.llseek = default_llseek,
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.write = sof_dfsentry_write,
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/* create FS entry for debug files that can expose DSP memories, registers */
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int snd_sof_debugfs_io_item(struct snd_sof_dev *sdev,
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void __iomem *base, size_t size,
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enum sof_debugfs_access_type access_type)
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struct snd_sof_dfsentry *dfse;
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dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
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dfse->type = SOF_DFSENTRY_TYPE_IOMEM;
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dfse->access_type = access_type;
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#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
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* allocate cache buffer that will be used to save the mem window
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* contents prior to suspend
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if (access_type == SOF_DEBUGFS_ACCESS_D0_ONLY) {
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dfse->cache_buf = devm_kzalloc(sdev->dev, size, GFP_KERNEL);
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if (!dfse->cache_buf)
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debugfs_create_file(name, 0444, sdev->debugfs_root, dfse,
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/* add to dfsentry list */
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list_add(&dfse->list, &sdev->dfsentry_list);
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EXPORT_SYMBOL_GPL(snd_sof_debugfs_io_item);
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/* create FS entry for debug files to expose kernel memory */
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int snd_sof_debugfs_buf_item(struct snd_sof_dev *sdev,
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void *base, size_t size,
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const char *name, mode_t mode)
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struct snd_sof_dfsentry *dfse;
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dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
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dfse->type = SOF_DFSENTRY_TYPE_BUF;
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#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
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* cache_buf is unused for SOF_DFSENTRY_TYPE_BUF debugfs entries.
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* So, use it to save the results of the last IPC flood test.
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dfse->cache_buf = devm_kzalloc(sdev->dev, IPC_FLOOD_TEST_RESULT_LEN,
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if (!dfse->cache_buf)
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debugfs_create_file(name, mode, sdev->debugfs_root, dfse,
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/* add to dfsentry list */
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list_add(&dfse->list, &sdev->dfsentry_list);
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EXPORT_SYMBOL_GPL(snd_sof_debugfs_buf_item);
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int snd_sof_dbg_init(struct snd_sof_dev *sdev)
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const struct snd_sof_dsp_ops *ops = sof_ops(sdev);
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const struct snd_sof_debugfs_map *map;
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/* use "sof" as top level debugFS dir */
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sdev->debugfs_root = debugfs_create_dir("sof", NULL);
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/* init dfsentry list */
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INIT_LIST_HEAD(&sdev->dfsentry_list);
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/* create debugFS files for platform specific MMIO/DSP memories */
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for (i = 0; i < ops->debug_map_count; i++) {
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map = &ops->debug_map[i];
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err = snd_sof_debugfs_io_item(sdev, sdev->bar[map->bar] +
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map->offset, map->size,
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map->name, map->access_type);
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/* errors are only due to memory allocation, not debugfs */
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#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
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/* create read-write ipc_flood_count debugfs entry */
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err = snd_sof_debugfs_buf_item(sdev, NULL, 0,
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"ipc_flood_count", 0666);
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/* errors are only due to memory allocation, not debugfs */
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/* create read-write ipc_flood_duration_ms debugfs entry */
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err = snd_sof_debugfs_buf_item(sdev, NULL, 0,
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"ipc_flood_duration_ms", 0666);
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/* errors are only due to memory allocation, not debugfs */
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EXPORT_SYMBOL_GPL(snd_sof_dbg_init);
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void snd_sof_free_debug(struct snd_sof_dev *sdev)
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debugfs_remove_recursive(sdev->debugfs_root);
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EXPORT_SYMBOL_GPL(snd_sof_free_debug);
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void snd_sof_handle_fw_exception(struct snd_sof_dev *sdev)
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if (IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_RETAIN_DSP_CONTEXT) ||
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(sof_core_debug & SOF_DBG_RETAIN_CTX)) {
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/* should we prevent DSP entering D3 ? */
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dev_info(sdev->dev, "info: preventing DSP entering D3 state to preserve context\n");
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pm_runtime_get_noresume(sdev->dev);
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/* dump vital information to the logs */
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snd_sof_dsp_dbg_dump(sdev, SOF_DBG_REGS | SOF_DBG_MBOX);
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snd_sof_ipc_dump(sdev);
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snd_sof_trace_notify_for_error(sdev);
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EXPORT_SYMBOL(snd_sof_handle_fw_exception);