From: Dmitry Baryshkov <dbaryshkov@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: akpm@linux-foundation.org,
Haavard Skinnemoen <haavard.skinnemoen@atmel.com>,
Russell King <rmk+lkml@arm.linux.org.uk>,
Paul Mundt <lethal@linux-sh.org>,
pHilipp Zabel <philipp.zabel@gmail.com>,
Pavel Machek <pavel@ucw.cz>,
tony@atomide.com, paul@pwsan.com
Subject: [PATCH 2/6] Clocklib: debugfs support
Date: Thu, 3 Apr 2008 17:23:37 +0400 [thread overview]
Message-ID: <20080403132337.GA26981@doriath.ww600.siemens.net> (raw)
In-Reply-To: <20080403132142.GA26882@doriath.ww600.siemens.net>
Provide /sys/kernel/debug/clock to ease debugging.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
---
include/linux/clklib.h | 2 +
kernel/clklib.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 76 insertions(+), 0 deletions(-)
diff --git a/include/linux/clklib.h b/include/linux/clklib.h
index 3d0ffaf..77514cc 100644
--- a/include/linux/clklib.h
+++ b/include/linux/clklib.h
@@ -19,6 +19,7 @@ struct seq_file;
* @get_rate: obtain the current clock rate of a specified clock
* @set_rate: set the clock rate for a specified clock
* @round_rate: adjust a reate to the exact rate a clock can provide
+ * @format: output any additional information for a clock
*
* This structure specifies clock operations that are used to configure
* specific clock.
@@ -30,6 +31,7 @@ struct clk_ops {
unsigned long (*get_rate) (struct clk *clk);
int (*set_rate) (struct clk *, unsigned long);
long (*round_rate) (struct clk *, unsigned long);
+ int (*format) (struct clk *, struct seq_file *);
};
/**
diff --git a/kernel/clklib.c b/kernel/clklib.c
index 012f845..8d872e1 100644
--- a/kernel/clklib.c
+++ b/kernel/clklib.c
@@ -324,3 +324,77 @@ out:
return rc;
}
EXPORT_SYMBOL(clk_alloc_function);
+
+#ifdef CONFIG_DEBUG_FS
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#define NAME_FIELD_LEN 20
+
+static void dump_clocks(struct seq_file *s, struct clk *parent, int nest)
+{
+ struct clk *clk;
+ int i;
+
+ list_for_each_entry(clk, &clocks, node) {
+ if (clk->parent == parent) {
+ for (i = 0; i < nest; i++) {
+ seq_putc(s, ' ');
+ seq_putc(s, ' ');
+ }
+ seq_puts(s, clk->name);
+
+ i = 2 * nest + strlen(clk->name);
+ if (i >= NAME_FIELD_LEN)
+ i = NAME_FIELD_LEN - 1;
+ for (; i < NAME_FIELD_LEN; i++) {
+ seq_putc(s, ' ');
+ }
+ seq_printf(s, "%c use=%d rate=%10lu Hz",
+ clk->ops && clk->ops->set_parent ? '*' : ' ',
+ clk->users,
+ __clk_get_rate(clk));
+ if (clk->ops && clk->ops->format)
+ clk->ops->format(clk, s);
+ seq_putc(s, '\n');
+
+ dump_clocks(s, clk, nest + 1);
+ }
+ }
+}
+
+static int clocklib_show(struct seq_file *s, void *unused)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&clocks_lock, flags);
+
+ dump_clocks(s, NULL, 0);
+
+ spin_unlock_irqrestore(&clocks_lock, flags);
+
+ return 0;
+}
+
+static int clocklib_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, clocklib_show, NULL);
+}
+
+static struct file_operations clocklib_operations = {
+ .open = clocklib_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init clocklib_debugfs_init(void)
+{
+ debugfs_create_file("clock", S_IFREG | S_IRUGO,
+ NULL, NULL, &clocklib_operations);
+ return 0;
+}
+subsys_initcall(clocklib_debugfs_init);
+
+#endif /* DEBUG_FS */
--
1.5.4.4
--
With best wishes
Dmitry
next prev parent reply other threads:[~2008-04-03 13:24 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-03 13:21 [PATCH 0/6] Clocklib: generic clocks framework Dmitry Baryshkov
2008-04-03 13:23 ` [PATCH 1/6] Clocklib: add generic framework for managing clocks Dmitry Baryshkov
2008-04-07 22:55 ` Andrew Morton
2008-04-03 13:23 ` Dmitry Baryshkov [this message]
2008-04-07 22:59 ` [PATCH 2/6] Clocklib: debugfs support Andrew Morton
2008-04-08 1:04 ` Greg KH
2008-04-03 13:23 ` [PATCH 3/6] Clocklib: support sa1100 sub-arch Dmitry Baryshkov
2008-04-03 13:23 ` [PATCH 4/6] Clocklib: support ARM pxa sub-arch Dmitry Baryshkov
2008-04-03 13:24 ` [PATCH 5/6] Clocklib: Use correct clock for IrDA on pxa Dmitry Baryshkov
2008-04-07 23:00 ` Andrew Morton
2008-04-07 23:04 ` Russell King
2008-04-08 9:47 ` Dmitry
2008-04-08 19:33 ` Russell King
2008-04-09 7:15 ` Dmitry
2008-04-09 19:05 ` Russell King
2008-04-09 19:09 ` Alan Cox
2008-04-09 19:20 ` Russell King
2008-04-09 19:39 ` Dmitry
2008-04-09 20:52 ` Alan Cox
2008-04-09 21:37 ` Russell King
2008-04-03 13:24 ` [PATCH 6/6] Clocklib: use correct name for 3,6MHz clock Dmitry Baryshkov
2008-04-07 23:01 ` Andrew Morton
2008-04-07 23:06 ` Russell King
2008-04-08 9:52 ` Dmitry
2008-04-08 19:35 ` Russell King
2008-04-08 19:58 ` Dmitry
2008-04-08 20:07 ` Russell King
2008-04-09 7:19 ` Dmitry
2008-04-11 10:25 ` Dmitry Baryshkov
-- strict thread matches above, loose matches on Subject: below --
2008-03-31 8:39 [PATCH 0/6] Clocklib: generic clocks framework Dmitry Baryshkov
2008-03-31 8:44 ` [PATCH 2/6] Clocklib: debugfs support Dmitry Baryshkov
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