Messages in this thread Patch in this message |  | | Date | Thu, 3 Apr 2008 17:23:37 +0400 | From | Dmitry Baryshkov <> | Subject | [PATCH 2/6] Clocklib: debugfs support |
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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
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