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soc: qcom: cmd-db: Add debugfs dumping file 

It's useful for kernel devs to understand what resources and data is
stored inside command db. Add a file in debugufs called 'cmd-db' to dump
the memory contents and strings for resources along with their
addresses. E.g.

 Command DB DUMP
 Slave ARC (v16.0)
 -------------------------
 0x00030000: cx.lvl [00 00 10 00 40 00 80 00 c0 00 00 01 80 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00]
 0x00030004: cx.tmr
 0x00030010: mx.lvl [00 00 10 00 00 01 80 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00]
 0x00030014: mx.tmr

Cc: Lina Iyer <ilina@codeaurora.org>
Cc: Maulik Shah <mkshah@codeaurora.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20200309185704.2491-1-swboyd@chromium.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Stephen Boyd 2020-03-09 11:57:04 -07:00 committed by Bjorn Andersson
parent 27a344139c
commit d6815c5c43
1 changed files with 76 additions and 2 deletions
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78
drivers/soc/qcom/cmd-db.c
View File

@ -1,12 +1,13 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. */
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/types.h>
#include <soc/qcom/cmd-db.h>
@ -236,6 +237,77 @@ enum cmd_db_hw_type cmd_db_read_slave_id(const char *id)
}
EXPORT_SYMBOL(cmd_db_read_slave_id);
#ifdef CONFIG_DEBUG_FS
static int cmd_db_debugfs_dump(struct seq_file *seq, void *p)
{
int i, j;
const struct rsc_hdr *rsc;
const struct entry_header *ent;
const char *name;
u16 len, version;
u8 major, minor;
seq_puts(seq, "Command DB DUMP\n");
for (i = 0; i < MAX_SLV_ID; i++) {
rsc = &cmd_db_header->header[i];
if (!rsc->slv_id)
break;
switch (rsc->slv_id) {
case CMD_DB_HW_ARC:
name = "ARC";
break;
case CMD_DB_HW_VRM:
name = "VRM";
break;
case CMD_DB_HW_BCM:
name = "BCM";
break;
default:
name = "Unknown";
break;
}
version = le16_to_cpu(rsc->version);
major = version >> 8;
minor = version;
seq_printf(seq, "Slave %s (v%u.%u)\n", name, major, minor);
seq_puts(seq, "-------------------------\n");
ent = rsc_to_entry_header(rsc);
for (j = 0; j < le16_to_cpu(rsc->cnt); j++, ent++) {
seq_printf(seq, "0x%08x: %*pEp", le32_to_cpu(ent->addr),
sizeof(ent->id), ent->id);
len = le16_to_cpu(ent->len);
if (len) {
seq_printf(seq, " [%*ph]",
len, rsc_offset(rsc, ent));
}
seq_putc(seq, '\n');
}
}
return 0;
}
static int open_cmd_db_debugfs(struct inode *inode, struct file *file)
{
return single_open(file, cmd_db_debugfs_dump, inode->i_private);
}
#endif
static const struct file_operations cmd_db_debugfs_ops = {
#ifdef CONFIG_DEBUG_FS
.open = open_cmd_db_debugfs,
#endif
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int cmd_db_dev_probe(struct platform_device *pdev)
{
struct reserved_mem *rmem;
@ -259,12 +331,14 @@ static int cmd_db_dev_probe(struct platform_device *pdev)
return -EINVAL;
}
debugfs_create_file("cmd-db", 0400, NULL, NULL, &cmd_db_debugfs_ops);
return 0;
}
static const struct of_device_id cmd_db_match_table[] = {
{ .compatible = "qcom,cmd-db" },
{ },
{ }
};
static struct platform_driver cmd_db_dev_driver = {