Commit d6815c5c authored by Stephen Boyd's avatar Stephen Boyd Committed by Bjorn Andersson
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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: default avatarStephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20200309185704.2491-1-swboyd@chromium.org


Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
parent 27a34413

drivers/soc/qcom/cmd-db.c

+76 −2
Original line number Diff line number Diff line 
/* 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 = {

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