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// 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) 2018-2023 Intel Corporation
//
#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <sound/sof/debug.h>
#include <sound/sof/ipc4/header.h>
#include "sof-priv.h"
#include "ops.h"
#include "ipc4-telemetry.h"
#include "ipc4-priv.h"
static void __iomem *sof_ipc4_query_exception_address(struct snd_sof_dev *sdev)
{
u32 type = SOF_IPC4_DEBUG_SLOT_TELEMETRY;
size_t telemetry_slot_offset;
u32 offset;
telemetry_slot_offset = sof_ipc4_find_debug_slot_offset_by_type(sdev, type);
if (!telemetry_slot_offset)
return NULL;
/* skip the first separator magic number */
offset = telemetry_slot_offset + sizeof(u32);
return sdev->bar[sdev->mailbox_bar] + offset;
}
static ssize_t sof_telemetry_entry_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;
void __iomem *io_addr;
loff_t pos = *ppos;
size_t size_ret;
u8 *buf;
if (pos < 0)
return -EINVAL;
/* skip the first separator magic number */
if (pos >= SOF_IPC4_DEBUG_SLOT_SIZE - 4 || !count)
return 0;
if (count > SOF_IPC4_DEBUG_SLOT_SIZE - 4 - pos)
count = SOF_IPC4_DEBUG_SLOT_SIZE - 4 - pos;
io_addr = sof_ipc4_query_exception_address(sdev);
if (!io_addr)
return -EFAULT;
buf = kzalloc(SOF_IPC4_DEBUG_SLOT_SIZE - 4, GFP_KERNEL);
if (!buf)
return -ENOMEM;
memcpy_fromio(buf, io_addr, SOF_IPC4_DEBUG_SLOT_SIZE - 4);
size_ret = copy_to_user(buffer, buf + pos, count);
if (size_ret) {
kfree(buf);
return -EFAULT;
}
*ppos = pos + count;
kfree(buf);
return count;
}
static const struct file_operations sof_telemetry_fops = {
.open = simple_open,
.read = sof_telemetry_entry_read,
};
void sof_ipc4_create_exception_debugfs_node(struct snd_sof_dev *sdev)
{
struct snd_sof_dfsentry *dfse;
dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
if (!dfse)
return;
dfse->type = SOF_DFSENTRY_TYPE_IOMEM;
dfse->size = SOF_IPC4_DEBUG_SLOT_SIZE - 4;
dfse->access_type = SOF_DEBUGFS_ACCESS_ALWAYS;
dfse->sdev = sdev;
list_add(&dfse->list, &sdev->dfsentry_list);
debugfs_create_file("exception", 0444, sdev->debugfs_root, dfse, &sof_telemetry_fops);
}
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