linux-kernel - Re: [PATCH] soc: qcom: cmd-db: Add debugfs dumping file

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Message-ID: <20200414215015.GA3820@codeaurora.org>
Date:   Tue, 14 Apr 2020 15:50:15 -0600
From:   Lina Iyer <ilina@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Maulik Shah <mkshah@...eaurora.org>
Subject: Re: [PATCH] soc: qcom: cmd-db: Add debugfs dumping file

On Mon, Mar 09 2020 at 12:57 -0600, Stephen Boyd wrote:
>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@...eaurora.org>
>Cc: Maulik Shah <mkshah@...eaurora.org>
>Signed-off-by: Stephen Boyd <swboyd@...omium.org>
>---
> drivers/soc/qcom/cmd-db.c | 79 ++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 77 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c
>index f6c3d17b05c7..6c308f92a13c 100644
>--- a/drivers/soc/qcom/cmd-db.c
>+++ b/drivers/soc/qcom/cmd-db.c
>@@ -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 +237,78 @@ 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),
0x%05x is what we would have for a resource address.
>+				   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 +332,14 @@ 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 = {
>
>base-commit: 2c523b344dfa65a3738e7039832044aa133c75fb
>--
>Sent by a computer, using git, on the internet
>