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// 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"
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;
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 %s cannot be read in DSP D3\n",
dfse->dfsentry->d_name.name);
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,
};
/* 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
dfse->dfsentry = debugfs_create_file(name, 0444, sdev->debugfs_root,
dfse, &sof_dfs_fops);
if (!dfse->dfsentry) {
/* can't rely on debugfs, only log error and keep going */
dev_err(sdev->dev, "error: cannot create debugfs entry %s\n",
name);
} else {
/* 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)
{
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;
dfse->dfsentry = debugfs_create_file(name, 0444, sdev->debugfs_root,
dfse, &sof_dfs_fops);
if (!dfse->dfsentry) {
/* can't rely on debugfs, only log error and keep going */
dev_err(sdev->dev, "error: cannot create debugfs entry %s\n",
name);
} else {
/* 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);
if (IS_ERR_OR_NULL(sdev->debugfs_root)) {
dev_err(sdev->dev, "error: failed to create debugfs directory\n");
return 0;
}
/* 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;
}
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);
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