mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 10:27:04 +07:00
9a06508bf7
Add config option to prevent DSP entering D3 after any FW exception. This can then be used to dump FW context for debug. Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20190927200538.660-5-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
480 lines
12 KiB
C
480 lines
12 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
|
|
//
|
|
// This file is provided under a dual BSD/GPLv2 license. When using or
|
|
// redistributing this file, you may do so under either license.
|
|
//
|
|
// Copyright(c) 2018 Intel Corporation. All rights reserved.
|
|
//
|
|
// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
|
|
//
|
|
// Generic debug routines used to export DSP MMIO and memories to userspace
|
|
// for firmware debugging.
|
|
//
|
|
|
|
#include <linux/debugfs.h>
|
|
#include <linux/io.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include "sof-priv.h"
|
|
#include "ops.h"
|
|
|
|
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
|
|
#define MAX_IPC_FLOOD_DURATION_MS 1000
|
|
#define MAX_IPC_FLOOD_COUNT 10000
|
|
#define IPC_FLOOD_TEST_RESULT_LEN 512
|
|
|
|
static int sof_debug_ipc_flood_test(struct snd_sof_dev *sdev,
|
|
struct snd_sof_dfsentry *dfse,
|
|
bool flood_duration_test,
|
|
unsigned long ipc_duration_ms,
|
|
unsigned long ipc_count)
|
|
{
|
|
struct sof_ipc_cmd_hdr hdr;
|
|
struct sof_ipc_reply reply;
|
|
u64 min_response_time = U64_MAX;
|
|
ktime_t start, end, test_end;
|
|
u64 avg_response_time = 0;
|
|
u64 max_response_time = 0;
|
|
u64 ipc_response_time;
|
|
int i = 0;
|
|
int ret;
|
|
|
|
/* configure test IPC */
|
|
hdr.cmd = SOF_IPC_GLB_TEST_MSG | SOF_IPC_TEST_IPC_FLOOD;
|
|
hdr.size = sizeof(hdr);
|
|
|
|
/* set test end time for duration flood test */
|
|
if (flood_duration_test)
|
|
test_end = ktime_get_ns() + ipc_duration_ms * NSEC_PER_MSEC;
|
|
|
|
/* send test IPC's */
|
|
while (1) {
|
|
start = ktime_get();
|
|
ret = sof_ipc_tx_message(sdev->ipc, hdr.cmd, &hdr, hdr.size,
|
|
&reply, sizeof(reply));
|
|
end = ktime_get();
|
|
|
|
if (ret < 0)
|
|
break;
|
|
|
|
/* compute min and max response times */
|
|
ipc_response_time = ktime_to_ns(ktime_sub(end, start));
|
|
min_response_time = min(min_response_time, ipc_response_time);
|
|
max_response_time = max(max_response_time, ipc_response_time);
|
|
|
|
/* sum up response times */
|
|
avg_response_time += ipc_response_time;
|
|
i++;
|
|
|
|
/* test complete? */
|
|
if (flood_duration_test) {
|
|
if (ktime_to_ns(end) >= test_end)
|
|
break;
|
|
} else {
|
|
if (i == ipc_count)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (ret < 0)
|
|
dev_err(sdev->dev,
|
|
"error: ipc flood test failed at %d iterations\n", i);
|
|
|
|
/* return if the first IPC fails */
|
|
if (!i)
|
|
return ret;
|
|
|
|
/* compute average response time */
|
|
do_div(avg_response_time, i);
|
|
|
|
/* clear previous test output */
|
|
memset(dfse->cache_buf, 0, IPC_FLOOD_TEST_RESULT_LEN);
|
|
|
|
if (flood_duration_test) {
|
|
dev_dbg(sdev->dev, "IPC Flood test duration: %lums\n",
|
|
ipc_duration_ms);
|
|
snprintf(dfse->cache_buf, IPC_FLOOD_TEST_RESULT_LEN,
|
|
"IPC Flood test duration: %lums\n", ipc_duration_ms);
|
|
}
|
|
|
|
dev_dbg(sdev->dev,
|
|
"IPC Flood count: %d, Avg response time: %lluns\n",
|
|
i, avg_response_time);
|
|
dev_dbg(sdev->dev, "Max response time: %lluns\n",
|
|
max_response_time);
|
|
dev_dbg(sdev->dev, "Min response time: %lluns\n",
|
|
min_response_time);
|
|
|
|
/* format output string */
|
|
snprintf(dfse->cache_buf + strlen(dfse->cache_buf),
|
|
IPC_FLOOD_TEST_RESULT_LEN - strlen(dfse->cache_buf),
|
|
"IPC Flood count: %d\nAvg response time: %lluns\n",
|
|
i, avg_response_time);
|
|
|
|
snprintf(dfse->cache_buf + strlen(dfse->cache_buf),
|
|
IPC_FLOOD_TEST_RESULT_LEN - strlen(dfse->cache_buf),
|
|
"Max response time: %lluns\nMin response time: %lluns\n",
|
|
max_response_time, min_response_time);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static ssize_t sof_dfsentry_write(struct file *file, const char __user *buffer,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
|
|
struct snd_sof_dfsentry *dfse = file->private_data;
|
|
struct snd_sof_dev *sdev = dfse->sdev;
|
|
unsigned long ipc_duration_ms = 0;
|
|
bool flood_duration_test = false;
|
|
unsigned long ipc_count = 0;
|
|
struct dentry *dentry;
|
|
int err;
|
|
#endif
|
|
size_t size;
|
|
char *string;
|
|
int ret;
|
|
|
|
string = kzalloc(count, GFP_KERNEL);
|
|
if (!string)
|
|
return -ENOMEM;
|
|
|
|
size = simple_write_to_buffer(string, count, ppos, buffer, count);
|
|
ret = size;
|
|
|
|
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
|
|
/*
|
|
* write op is only supported for ipc_flood_count or
|
|
* ipc_flood_duration_ms debugfs entries atm.
|
|
* ipc_flood_count floods the DSP with the number of IPC's specified.
|
|
* ipc_duration_ms test floods the DSP for the time specified
|
|
* in the debugfs entry.
|
|
*/
|
|
dentry = file->f_path.dentry;
|
|
if (strcmp(dentry->d_name.name, "ipc_flood_count") &&
|
|
strcmp(dentry->d_name.name, "ipc_flood_duration_ms"))
|
|
return -EINVAL;
|
|
|
|
if (!strcmp(dentry->d_name.name, "ipc_flood_duration_ms"))
|
|
flood_duration_test = true;
|
|
|
|
/* test completion criterion */
|
|
if (flood_duration_test)
|
|
ret = kstrtoul(string, 0, &ipc_duration_ms);
|
|
else
|
|
ret = kstrtoul(string, 0, &ipc_count);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/* limit max duration/ipc count for flood test */
|
|
if (flood_duration_test) {
|
|
if (!ipc_duration_ms) {
|
|
ret = size;
|
|
goto out;
|
|
}
|
|
|
|
/* find the minimum. min() is not used to avoid warnings */
|
|
if (ipc_duration_ms > MAX_IPC_FLOOD_DURATION_MS)
|
|
ipc_duration_ms = MAX_IPC_FLOOD_DURATION_MS;
|
|
} else {
|
|
if (!ipc_count) {
|
|
ret = size;
|
|
goto out;
|
|
}
|
|
|
|
/* find the minimum. min() is not used to avoid warnings */
|
|
if (ipc_count > MAX_IPC_FLOOD_COUNT)
|
|
ipc_count = MAX_IPC_FLOOD_COUNT;
|
|
}
|
|
|
|
ret = pm_runtime_get_sync(sdev->dev);
|
|
if (ret < 0) {
|
|
dev_err_ratelimited(sdev->dev,
|
|
"error: debugfs write failed to resume %d\n",
|
|
ret);
|
|
pm_runtime_put_noidle(sdev->dev);
|
|
goto out;
|
|
}
|
|
|
|
/* flood test */
|
|
ret = sof_debug_ipc_flood_test(sdev, dfse, flood_duration_test,
|
|
ipc_duration_ms, ipc_count);
|
|
|
|
pm_runtime_mark_last_busy(sdev->dev);
|
|
err = pm_runtime_put_autosuspend(sdev->dev);
|
|
if (err < 0)
|
|
dev_err_ratelimited(sdev->dev,
|
|
"error: debugfs write failed to idle %d\n",
|
|
err);
|
|
|
|
/* return size if test is successful */
|
|
if (ret >= 0)
|
|
ret = size;
|
|
out:
|
|
#endif
|
|
kfree(string);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t sof_dfsentry_read(struct file *file, char __user *buffer,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct snd_sof_dfsentry *dfse = file->private_data;
|
|
struct snd_sof_dev *sdev = dfse->sdev;
|
|
loff_t pos = *ppos;
|
|
size_t size_ret;
|
|
int skip = 0;
|
|
int size;
|
|
u8 *buf;
|
|
|
|
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
|
|
struct dentry *dentry;
|
|
|
|
dentry = file->f_path.dentry;
|
|
if ((!strcmp(dentry->d_name.name, "ipc_flood_count") ||
|
|
!strcmp(dentry->d_name.name, "ipc_flood_duration_ms")) &&
|
|
dfse->cache_buf) {
|
|
if (*ppos)
|
|
return 0;
|
|
|
|
count = strlen(dfse->cache_buf);
|
|
size_ret = copy_to_user(buffer, dfse->cache_buf, count);
|
|
if (size_ret)
|
|
return -EFAULT;
|
|
|
|
*ppos += count;
|
|
return count;
|
|
}
|
|
#endif
|
|
size = dfse->size;
|
|
|
|
/* validate position & count */
|
|
if (pos < 0)
|
|
return -EINVAL;
|
|
if (pos >= size || !count)
|
|
return 0;
|
|
/* find the minimum. min() is not used since it adds sparse warnings */
|
|
if (count > size - pos)
|
|
count = size - pos;
|
|
|
|
/* align io read start to u32 multiple */
|
|
pos = ALIGN_DOWN(pos, 4);
|
|
|
|
/* intermediate buffer size must be u32 multiple */
|
|
size = ALIGN(count, 4);
|
|
|
|
/* if start position is unaligned, read extra u32 */
|
|
if (unlikely(pos != *ppos)) {
|
|
skip = *ppos - pos;
|
|
if (pos + size + 4 < dfse->size)
|
|
size += 4;
|
|
}
|
|
|
|
buf = kzalloc(size, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
if (dfse->type == SOF_DFSENTRY_TYPE_IOMEM) {
|
|
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
|
|
/*
|
|
* If the DSP is active: copy from IO.
|
|
* If the DSP is suspended:
|
|
* - Copy from IO if the memory is always accessible.
|
|
* - Otherwise, copy from cached buffer.
|
|
*/
|
|
if (pm_runtime_active(sdev->dev) ||
|
|
dfse->access_type == SOF_DEBUGFS_ACCESS_ALWAYS) {
|
|
memcpy_fromio(buf, dfse->io_mem + pos, size);
|
|
} else {
|
|
dev_info(sdev->dev,
|
|
"Copying cached debugfs data\n");
|
|
memcpy(buf, dfse->cache_buf + pos, size);
|
|
}
|
|
#else
|
|
/* if the DSP is in D3 */
|
|
if (!pm_runtime_active(sdev->dev) &&
|
|
dfse->access_type == SOF_DEBUGFS_ACCESS_D0_ONLY) {
|
|
dev_err(sdev->dev,
|
|
"error: debugfs entry cannot be read in DSP D3\n");
|
|
kfree(buf);
|
|
return -EINVAL;
|
|
}
|
|
|
|
memcpy_fromio(buf, dfse->io_mem + pos, size);
|
|
#endif
|
|
} else {
|
|
memcpy(buf, ((u8 *)(dfse->buf) + pos), size);
|
|
}
|
|
|
|
/* copy to userspace */
|
|
size_ret = copy_to_user(buffer, buf + skip, count);
|
|
|
|
kfree(buf);
|
|
|
|
/* update count & position if copy succeeded */
|
|
if (size_ret)
|
|
return -EFAULT;
|
|
|
|
*ppos = pos + count;
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations sof_dfs_fops = {
|
|
.open = simple_open,
|
|
.read = sof_dfsentry_read,
|
|
.llseek = default_llseek,
|
|
.write = sof_dfsentry_write,
|
|
};
|
|
|
|
/* create FS entry for debug files that can expose DSP memories, registers */
|
|
int snd_sof_debugfs_io_item(struct snd_sof_dev *sdev,
|
|
void __iomem *base, size_t size,
|
|
const char *name,
|
|
enum sof_debugfs_access_type access_type)
|
|
{
|
|
struct snd_sof_dfsentry *dfse;
|
|
|
|
if (!sdev)
|
|
return -EINVAL;
|
|
|
|
dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
|
|
if (!dfse)
|
|
return -ENOMEM;
|
|
|
|
dfse->type = SOF_DFSENTRY_TYPE_IOMEM;
|
|
dfse->io_mem = base;
|
|
dfse->size = size;
|
|
dfse->sdev = sdev;
|
|
dfse->access_type = access_type;
|
|
|
|
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
|
|
/*
|
|
* allocate cache buffer that will be used to save the mem window
|
|
* contents prior to suspend
|
|
*/
|
|
if (access_type == SOF_DEBUGFS_ACCESS_D0_ONLY) {
|
|
dfse->cache_buf = devm_kzalloc(sdev->dev, size, GFP_KERNEL);
|
|
if (!dfse->cache_buf)
|
|
return -ENOMEM;
|
|
}
|
|
#endif
|
|
|
|
debugfs_create_file(name, 0444, sdev->debugfs_root, dfse,
|
|
&sof_dfs_fops);
|
|
|
|
/* add to dfsentry list */
|
|
list_add(&dfse->list, &sdev->dfsentry_list);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_sof_debugfs_io_item);
|
|
|
|
/* create FS entry for debug files to expose kernel memory */
|
|
int snd_sof_debugfs_buf_item(struct snd_sof_dev *sdev,
|
|
void *base, size_t size,
|
|
const char *name, mode_t mode)
|
|
{
|
|
struct snd_sof_dfsentry *dfse;
|
|
|
|
if (!sdev)
|
|
return -EINVAL;
|
|
|
|
dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
|
|
if (!dfse)
|
|
return -ENOMEM;
|
|
|
|
dfse->type = SOF_DFSENTRY_TYPE_BUF;
|
|
dfse->buf = base;
|
|
dfse->size = size;
|
|
dfse->sdev = sdev;
|
|
|
|
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
|
|
/*
|
|
* cache_buf is unused for SOF_DFSENTRY_TYPE_BUF debugfs entries.
|
|
* So, use it to save the results of the last IPC flood test.
|
|
*/
|
|
dfse->cache_buf = devm_kzalloc(sdev->dev, IPC_FLOOD_TEST_RESULT_LEN,
|
|
GFP_KERNEL);
|
|
if (!dfse->cache_buf)
|
|
return -ENOMEM;
|
|
#endif
|
|
|
|
debugfs_create_file(name, mode, sdev->debugfs_root, dfse,
|
|
&sof_dfs_fops);
|
|
/* add to dfsentry list */
|
|
list_add(&dfse->list, &sdev->dfsentry_list);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_sof_debugfs_buf_item);
|
|
|
|
int snd_sof_dbg_init(struct snd_sof_dev *sdev)
|
|
{
|
|
const struct snd_sof_dsp_ops *ops = sof_ops(sdev);
|
|
const struct snd_sof_debugfs_map *map;
|
|
int i;
|
|
int err;
|
|
|
|
/* use "sof" as top level debugFS dir */
|
|
sdev->debugfs_root = debugfs_create_dir("sof", NULL);
|
|
|
|
/* init dfsentry list */
|
|
INIT_LIST_HEAD(&sdev->dfsentry_list);
|
|
|
|
/* create debugFS files for platform specific MMIO/DSP memories */
|
|
for (i = 0; i < ops->debug_map_count; i++) {
|
|
map = &ops->debug_map[i];
|
|
|
|
err = snd_sof_debugfs_io_item(sdev, sdev->bar[map->bar] +
|
|
map->offset, map->size,
|
|
map->name, map->access_type);
|
|
/* errors are only due to memory allocation, not debugfs */
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
|
|
/* create read-write ipc_flood_count debugfs entry */
|
|
err = snd_sof_debugfs_buf_item(sdev, NULL, 0,
|
|
"ipc_flood_count", 0666);
|
|
|
|
/* errors are only due to memory allocation, not debugfs */
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* create read-write ipc_flood_duration_ms debugfs entry */
|
|
err = snd_sof_debugfs_buf_item(sdev, NULL, 0,
|
|
"ipc_flood_duration_ms", 0666);
|
|
|
|
/* errors are only due to memory allocation, not debugfs */
|
|
if (err < 0)
|
|
return err;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_sof_dbg_init);
|
|
|
|
void snd_sof_free_debug(struct snd_sof_dev *sdev)
|
|
{
|
|
debugfs_remove_recursive(sdev->debugfs_root);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_sof_free_debug);
|
|
|
|
void snd_sof_handle_fw_exception(struct snd_sof_dev *sdev)
|
|
{
|
|
if (IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_RETAIN_DSP_CONTEXT) ||
|
|
(sof_core_debug & SOF_DBG_RETAIN_CTX)) {
|
|
/* should we prevent DSP entering D3 ? */
|
|
dev_info(sdev->dev, "info: preventing DSP entering D3 state to preserve context\n");
|
|
pm_runtime_get_noresume(sdev->dev);
|
|
}
|
|
|
|
/* dump vital information to the logs */
|
|
snd_sof_dsp_dbg_dump(sdev, SOF_DBG_REGS | SOF_DBG_MBOX);
|
|
snd_sof_ipc_dump(sdev);
|
|
snd_sof_trace_notify_for_error(sdev);
|
|
}
|
|
EXPORT_SYMBOL(snd_sof_handle_fw_exception);
|