sound/soc/sof/debug.c - linux - Git at Google

 // SPDX-License-Identifier: (GPL-2.0-only 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 <sound/sof/ext_manifest.h>
 #include <sound/sof/debug.h>
 #include "sof-priv.h"
 #include "ops.h"

 static ssize_t sof_dfsentry_write(struct file *file, const char __user *buffer,
 				  size_t count, loff_t *ppos)
 {
 	size_t size;
 	char *string;
 	int ret;

 	string = kzalloc(count+1, GFP_KERNEL);
 	if (!string)
 		return -ENOMEM;

 	size = simple_write_to_buffer(string, count, ppos, buffer, count);
 	ret = size;

 	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;

 	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 */
 static 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;
 }

 int snd_sof_debugfs_add_region_item_iomem(struct snd_sof_dev *sdev,
 					  enum snd_sof_fw_blk_type blk_type, u32 offset,
 					  size_t size, const char *name,
 					  enum sof_debugfs_access_type access_type)
 {
 	int bar = snd_sof_dsp_get_bar_index(sdev, blk_type);

 	if (bar < 0)
 		return bar;

 	return snd_sof_debugfs_io_item(sdev, sdev->bar[bar] + offset, size, name,
 				       access_type);
 }
 EXPORT_SYMBOL_GPL(snd_sof_debugfs_add_region_item_iomem);

 /* 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;

 	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);

 static int memory_info_update(struct snd_sof_dev *sdev, char *buf, size_t buff_size)
 {
 	struct sof_ipc_cmd_hdr msg = {
 		.size = sizeof(struct sof_ipc_cmd_hdr),
 		.cmd = SOF_IPC_GLB_DEBUG | SOF_IPC_DEBUG_MEM_USAGE,
 	};
 	struct sof_ipc_dbg_mem_usage *reply;
 	int len;
 	int ret;
 	int i;

 	reply = kmalloc(SOF_IPC_MSG_MAX_SIZE, GFP_KERNEL);
 	if (!reply)
 		return -ENOMEM;

 	ret = pm_runtime_resume_and_get(sdev->dev);
 	if (ret < 0 && ret != -EACCES) {
 		dev_err(sdev->dev, "error: enabling device failed: %d\n", ret);
 		goto error;
 	}

 	ret = sof_ipc_tx_message(sdev->ipc, &msg, msg.size, reply, SOF_IPC_MSG_MAX_SIZE);
 	pm_runtime_mark_last_busy(sdev->dev);
 	pm_runtime_put_autosuspend(sdev->dev);
 	if (ret < 0 || reply->rhdr.error < 0) {
 		ret = min(ret, reply->rhdr.error);
 		dev_err(sdev->dev, "error: reading memory info failed, %d\n", ret);
 		goto error;
 	}

 	if (struct_size(reply, elems, reply->num_elems) != reply->rhdr.hdr.size) {
 		dev_err(sdev->dev, "error: invalid memory info ipc struct size, %d\n",
 			reply->rhdr.hdr.size);
 		ret = -EINVAL;
 		goto error;
 	}

 	for (i = 0, len = 0; i < reply->num_elems; i++) {
 		ret = scnprintf(buf + len, buff_size - len, "zone %d.%d used %#8x free %#8x\n",
 				reply->elems[i].zone, reply->elems[i].id,
 				reply->elems[i].used, reply->elems[i].free);
 		if (ret < 0)
 			goto error;
 		len += ret;
 	}

 	ret = len;
 error:
 	kfree(reply);
 	return ret;
 }

 static ssize_t memory_info_read(struct file *file, char __user *to, size_t count, loff_t *ppos)
 {
 	struct snd_sof_dfsentry *dfse = file->private_data;
 	struct snd_sof_dev *sdev = dfse->sdev;
 	int data_length;

 	/* read memory info from FW only once for each file read */
 	if (!*ppos) {
 		dfse->buf_data_size = 0;
 		data_length = memory_info_update(sdev, dfse->buf, dfse->size);
 		if (data_length < 0)
 			return data_length;
 		dfse->buf_data_size = data_length;
 	}

 	return simple_read_from_buffer(to, count, ppos, dfse->buf, dfse->buf_data_size);
 }

 static int memory_info_open(struct inode *inode, struct file *file)
 {
 	struct snd_sof_dfsentry *dfse = inode->i_private;
 	struct snd_sof_dev *sdev = dfse->sdev;

 	file->private_data = dfse;

 	/* allocate buffer memory only in first open run, to save memory when unused */
 	if (!dfse->buf) {
 		dfse->buf = devm_kmalloc(sdev->dev, PAGE_SIZE, GFP_KERNEL);
 		if (!dfse->buf)
 			return -ENOMEM;
 		dfse->size = PAGE_SIZE;
 	}

 	return 0;
 }

 static const struct file_operations memory_info_fops = {
 	.open = memory_info_open,
 	.read = memory_info_read,
 	.llseek = default_llseek,
 };

 int snd_sof_dbg_memory_info_init(struct snd_sof_dev *sdev)
 {
 	struct snd_sof_dfsentry *dfse;

 	dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
 	if (!dfse)
 		return -ENOMEM;

 	/* don't allocate buffer before first usage, to save memory when unused */
 	dfse->type = SOF_DFSENTRY_TYPE_BUF;
 	dfse->sdev = sdev;

 	debugfs_create_file("memory_info", 0444, sdev->debugfs_root, dfse, &memory_info_fops);

 	/* add to dfsentry list */
 	list_add(&dfse->list, &sdev->dfsentry_list);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_sof_dbg_memory_info_init);

 int snd_sof_dbg_init(struct snd_sof_dev *sdev)
 {
 	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;
 	}

 	return snd_sof_debugfs_buf_item(sdev, &sdev->fw_state,
 					sizeof(sdev->fw_state),
 					"fw_state", 0444);
 }
 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);

 static const struct soc_fw_state_info {
 	enum sof_fw_state state;
 	const char *name;
 } fw_state_dbg[] = {
 	{SOF_FW_BOOT_NOT_STARTED, "SOF_FW_BOOT_NOT_STARTED"},
 	{SOF_DSPLESS_MODE, "SOF_DSPLESS_MODE"},
 	{SOF_FW_BOOT_PREPARE, "SOF_FW_BOOT_PREPARE"},
 	{SOF_FW_BOOT_IN_PROGRESS, "SOF_FW_BOOT_IN_PROGRESS"},
 	{SOF_FW_BOOT_FAILED, "SOF_FW_BOOT_FAILED"},
 	{SOF_FW_BOOT_READY_FAILED, "SOF_FW_BOOT_READY_FAILED"},
 	{SOF_FW_BOOT_READY_OK, "SOF_FW_BOOT_READY_OK"},
 	{SOF_FW_BOOT_COMPLETE, "SOF_FW_BOOT_COMPLETE"},
 	{SOF_FW_CRASHED, "SOF_FW_CRASHED"},
 };

 static void snd_sof_dbg_print_fw_state(struct snd_sof_dev *sdev, const char *level)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(fw_state_dbg); i++) {
 		if (sdev->fw_state == fw_state_dbg[i].state) {
 			dev_printk(level, sdev->dev, "fw_state: %s (%d)\n",
 				   fw_state_dbg[i].name, i);
 			return;
 		}
 	}

 	dev_printk(level, sdev->dev, "fw_state: UNKNOWN (%d)\n", sdev->fw_state);
 }

 void snd_sof_dsp_dbg_dump(struct snd_sof_dev *sdev, const char *msg, u32 flags)
 {
 	char *level = (flags & SOF_DBG_DUMP_OPTIONAL) ? KERN_DEBUG : KERN_ERR;
 	bool print_all = sof_debug_check_flag(SOF_DBG_PRINT_ALL_DUMPS);

 	if (flags & SOF_DBG_DUMP_OPTIONAL && !print_all)
 		return;

 	if (sof_ops(sdev)->dbg_dump && !sdev->dbg_dump_printed) {
 		dev_printk(level, sdev->dev,
 			   "------------[ DSP dump start ]------------\n");
 		if (msg)
 			dev_printk(level, sdev->dev, "%s\n", msg);
 		snd_sof_dbg_print_fw_state(sdev, level);
 		sof_ops(sdev)->dbg_dump(sdev, flags);
 		dev_printk(level, sdev->dev,
 			   "------------[ DSP dump end ]------------\n");
 		if (!print_all)
 			sdev->dbg_dump_printed = true;
 	} else if (msg) {
 		dev_printk(level, sdev->dev, "%s\n", msg);
 	}
 }
 EXPORT_SYMBOL(snd_sof_dsp_dbg_dump);

 static void snd_sof_ipc_dump(struct snd_sof_dev *sdev)
 {
 	if (sof_ops(sdev)->ipc_dump  && !sdev->ipc_dump_printed) {
 		dev_err(sdev->dev, "------------[ IPC dump start ]------------\n");
 		sof_ops(sdev)->ipc_dump(sdev);
 		dev_err(sdev->dev, "------------[ IPC dump end ]------------\n");
 		if (!sof_debug_check_flag(SOF_DBG_PRINT_ALL_DUMPS))
 			sdev->ipc_dump_printed = true;
 	}
 }

 void snd_sof_handle_fw_exception(struct snd_sof_dev *sdev, const char *msg)
 {
 	if ((IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_RETAIN_DSP_CONTEXT) ||
 	    sof_debug_check_flag(SOF_DBG_RETAIN_CTX)) && !sdev->d3_prevented) {
 		/* should we prevent DSP entering D3 ? */
 		if (!sdev->ipc_dump_printed)
 			dev_info(sdev->dev,
 				 "Attempting to prevent DSP from entering D3 state to preserve context\n");

 		if (pm_runtime_get_if_in_use(sdev->dev) == 1)
 			sdev->d3_prevented = true;
 	}

 	/* dump vital information to the logs */
 	snd_sof_ipc_dump(sdev);
 	snd_sof_dsp_dbg_dump(sdev, msg, SOF_DBG_DUMP_REGS | SOF_DBG_DUMP_MBOX);
 	sof_fw_trace_fw_crashed(sdev);
 }
 EXPORT_SYMBOL(snd_sof_handle_fw_exception);
	// SPDX-License-Identifier: (GPL-2.0-only 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 <sound/sof/ext_manifest.h>
	#include <sound/sof/debug.h>
	#include "sof-priv.h"
	#include "ops.h"

	static ssize_t sof_dfsentry_write(struct file file, const char __user buffer,
	size_t count, loff_t *ppos)
	{
	size_t size;
	char *string;
	int ret;

	string = kzalloc(count+1, GFP_KERNEL);
	if (!string)
	return -ENOMEM;

	size = simple_write_to_buffer(string, count, ppos, buffer, count);
	ret = size;

	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;

	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 */
	static 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;
	}

	int snd_sof_debugfs_add_region_item_iomem(struct snd_sof_dev *sdev,
	enum snd_sof_fw_blk_type blk_type, u32 offset,
	size_t size, const char *name,
	enum sof_debugfs_access_type access_type)
	{
	int bar = snd_sof_dsp_get_bar_index(sdev, blk_type);

	if (bar < 0)
	return bar;

	return snd_sof_debugfs_io_item(sdev, sdev->bar[bar] + offset, size, name,
	access_type);
	}
	EXPORT_SYMBOL_GPL(snd_sof_debugfs_add_region_item_iomem);

	/* 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;

	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);

	static int memory_info_update(struct snd_sof_dev sdev, char buf, size_t buff_size)
	{
	struct sof_ipc_cmd_hdr msg = {
	.size = sizeof(struct sof_ipc_cmd_hdr),
	.cmd = SOF_IPC_GLB_DEBUG \| SOF_IPC_DEBUG_MEM_USAGE,
	};
	struct sof_ipc_dbg_mem_usage *reply;
	int len;
	int ret;
	int i;

	reply = kmalloc(SOF_IPC_MSG_MAX_SIZE, GFP_KERNEL);
	if (!reply)
	return -ENOMEM;

	ret = pm_runtime_resume_and_get(sdev->dev);
	if (ret < 0 && ret != -EACCES) {
	dev_err(sdev->dev, "error: enabling device failed: %d\n", ret);
	goto error;
	}

	ret = sof_ipc_tx_message(sdev->ipc, &msg, msg.size, reply, SOF_IPC_MSG_MAX_SIZE);
	pm_runtime_mark_last_busy(sdev->dev);
	pm_runtime_put_autosuspend(sdev->dev);
	if (ret < 0 \|\| reply->rhdr.error < 0) {
	ret = min(ret, reply->rhdr.error);
	dev_err(sdev->dev, "error: reading memory info failed, %d\n", ret);
	goto error;
	}

	if (struct_size(reply, elems, reply->num_elems) != reply->rhdr.hdr.size) {
	dev_err(sdev->dev, "error: invalid memory info ipc struct size, %d\n",
	reply->rhdr.hdr.size);
	ret = -EINVAL;
	goto error;
	}

	for (i = 0, len = 0; i < reply->num_elems; i++) {
	ret = scnprintf(buf + len, buff_size - len, "zone %d.%d used %#8x free %#8x\n",
	reply->elems[i].zone, reply->elems[i].id,
	reply->elems[i].used, reply->elems[i].free);
	if (ret < 0)
	goto error;
	len += ret;
	}

	ret = len;
	error:
	kfree(reply);
	return ret;
	}

	static ssize_t memory_info_read(struct file file, char __user to, size_t count, loff_t *ppos)
	{
	struct snd_sof_dfsentry *dfse = file->private_data;
	struct snd_sof_dev *sdev = dfse->sdev;
	int data_length;

	/* read memory info from FW only once for each file read */
	if (!*ppos) {
	dfse->buf_data_size = 0;
	data_length = memory_info_update(sdev, dfse->buf, dfse->size);
	if (data_length < 0)
	return data_length;
	dfse->buf_data_size = data_length;
	}

	return simple_read_from_buffer(to, count, ppos, dfse->buf, dfse->buf_data_size);
	}

	static int memory_info_open(struct inode inode, struct file file)
	{
	struct snd_sof_dfsentry *dfse = inode->i_private;
	struct snd_sof_dev *sdev = dfse->sdev;

	file->private_data = dfse;

	/* allocate buffer memory only in first open run, to save memory when unused */
	if (!dfse->buf) {
	dfse->buf = devm_kmalloc(sdev->dev, PAGE_SIZE, GFP_KERNEL);
	if (!dfse->buf)
	return -ENOMEM;
	dfse->size = PAGE_SIZE;
	}

	return 0;
	}

	static const struct file_operations memory_info_fops = {
	.open = memory_info_open,
	.read = memory_info_read,
	.llseek = default_llseek,
	};

	int snd_sof_dbg_memory_info_init(struct snd_sof_dev *sdev)
	{
	struct snd_sof_dfsentry *dfse;

	dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
	if (!dfse)
	return -ENOMEM;

	/* don't allocate buffer before first usage, to save memory when unused */
	dfse->type = SOF_DFSENTRY_TYPE_BUF;
	dfse->sdev = sdev;

	debugfs_create_file("memory_info", 0444, sdev->debugfs_root, dfse, &memory_info_fops);

	/* add to dfsentry list */
	list_add(&dfse->list, &sdev->dfsentry_list);
	return 0;
	}
	EXPORT_SYMBOL_GPL(snd_sof_dbg_memory_info_init);

	int snd_sof_dbg_init(struct snd_sof_dev *sdev)
	{
	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;
	}

	return snd_sof_debugfs_buf_item(sdev, &sdev->fw_state,
	sizeof(sdev->fw_state),
	"fw_state", 0444);
	}
	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);

	static const struct soc_fw_state_info {
	enum sof_fw_state state;
	const char *name;
	} fw_state_dbg[] = {
	{SOF_FW_BOOT_NOT_STARTED, "SOF_FW_BOOT_NOT_STARTED"},
	{SOF_DSPLESS_MODE, "SOF_DSPLESS_MODE"},
	{SOF_FW_BOOT_PREPARE, "SOF_FW_BOOT_PREPARE"},
	{SOF_FW_BOOT_IN_PROGRESS, "SOF_FW_BOOT_IN_PROGRESS"},
	{SOF_FW_BOOT_FAILED, "SOF_FW_BOOT_FAILED"},
	{SOF_FW_BOOT_READY_FAILED, "SOF_FW_BOOT_READY_FAILED"},
	{SOF_FW_BOOT_READY_OK, "SOF_FW_BOOT_READY_OK"},
	{SOF_FW_BOOT_COMPLETE, "SOF_FW_BOOT_COMPLETE"},
	{SOF_FW_CRASHED, "SOF_FW_CRASHED"},
	};

	static void snd_sof_dbg_print_fw_state(struct snd_sof_dev sdev, const char level)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(fw_state_dbg); i++) {
	if (sdev->fw_state == fw_state_dbg[i].state) {
	dev_printk(level, sdev->dev, "fw_state: %s (%d)\n",
	fw_state_dbg[i].name, i);
	return;
	}
	}

	dev_printk(level, sdev->dev, "fw_state: UNKNOWN (%d)\n", sdev->fw_state);
	}

	void snd_sof_dsp_dbg_dump(struct snd_sof_dev sdev, const char msg, u32 flags)
	{
	char *level = (flags & SOF_DBG_DUMP_OPTIONAL) ? KERN_DEBUG : KERN_ERR;
	bool print_all = sof_debug_check_flag(SOF_DBG_PRINT_ALL_DUMPS);

	if (flags & SOF_DBG_DUMP_OPTIONAL && !print_all)
	return;

	if (sof_ops(sdev)->dbg_dump && !sdev->dbg_dump_printed) {
	dev_printk(level, sdev->dev,
	"------------[ DSP dump start ]------------\n");
	if (msg)
	dev_printk(level, sdev->dev, "%s\n", msg);
	snd_sof_dbg_print_fw_state(sdev, level);
	sof_ops(sdev)->dbg_dump(sdev, flags);
	dev_printk(level, sdev->dev,
	"------------[ DSP dump end ]------------\n");
	if (!print_all)
	sdev->dbg_dump_printed = true;
	} else if (msg) {
	dev_printk(level, sdev->dev, "%s\n", msg);
	}
	}
	EXPORT_SYMBOL(snd_sof_dsp_dbg_dump);

	static void snd_sof_ipc_dump(struct snd_sof_dev *sdev)
	{
	if (sof_ops(sdev)->ipc_dump && !sdev->ipc_dump_printed) {
	dev_err(sdev->dev, "------------[ IPC dump start ]------------\n");
	sof_ops(sdev)->ipc_dump(sdev);
	dev_err(sdev->dev, "------------[ IPC dump end ]------------\n");
	if (!sof_debug_check_flag(SOF_DBG_PRINT_ALL_DUMPS))
	sdev->ipc_dump_printed = true;
	}
	}

	void snd_sof_handle_fw_exception(struct snd_sof_dev sdev, const char msg)
	{
	if ((IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_RETAIN_DSP_CONTEXT) \|\|
	sof_debug_check_flag(SOF_DBG_RETAIN_CTX)) && !sdev->d3_prevented) {
	/* should we prevent DSP entering D3 ? */
	if (!sdev->ipc_dump_printed)
	dev_info(sdev->dev,
	"Attempting to prevent DSP from entering D3 state to preserve context\n");

	if (pm_runtime_get_if_in_use(sdev->dev) == 1)
	sdev->d3_prevented = true;
	}

	/* dump vital information to the logs */
	snd_sof_ipc_dump(sdev);
	snd_sof_dsp_dbg_dump(sdev, msg, SOF_DBG_DUMP_REGS \| SOF_DBG_DUMP_MBOX);
	sof_fw_trace_fw_crashed(sdev);
	}
	EXPORT_SYMBOL(snd_sof_handle_fw_exception);