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authorPeter 'p2' De Schrijver <peter.de-schrijver@nokia.com>2008-10-15 18:13:48 +0300
committerKevin Hilman <khilman@deeprootsystems.com>2009-09-02 15:08:24 -0700
commit331b93f41dff21c8f95709032cb184fb82bf2003 (patch)
tree6945e875909ae2571bd3344c978395414e61781c /arch/arm/mach-omap2/pm-debug.c
parenta23456e9b02b3fae0fc78cb33fad69803a50e5bc (diff)
OMAP: PM: Add pm-debug counters
This patch provides the debugfs entries and a function which will be called by the PM code to register the time spent per domain per state. Also some new fields are added to the powerdomain struct to keep the time information. NOTE: As of v2.6.29, using getnstimeofday() after drivers are suspended is no longer safe since the timekeeping subsystem is also suspended as part of the suspend process. Instead use sched_clock() which on OMAP returns the 32k SYNC timer in nanoseconds. Also, do not print out status for meta powerdomains (dpll*) Signed-off-by: Peter 'p2' De Schrijver <peter.de-schrijver@nokia.com> Signed-off-by: Tero Kristo <tero.kristo@nokia.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/arm/mach-omap2/pm-debug.c')
-rw-r--r--arch/arm/mach-omap2/pm-debug.c178
1 files changed, 177 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/pm-debug.c b/arch/arm/mach-omap2/pm-debug.c
index da3a53f8ccc..7383e85eac2 100644
--- a/arch/arm/mach-omap2/pm-debug.c
+++ b/arch/arm/mach-omap2/pm-debug.c
@@ -20,13 +20,15 @@
*/
#include <linux/kernel.h>
-#include <linux/timer.h>
+#include <linux/sched.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <mach/clock.h>
#include <mach/board.h>
+#include <mach/powerdomain.h>
+#include <mach/clockdomain.h>
#include "prm.h"
#include "cm.h"
@@ -150,3 +152,177 @@ void omap2_pm_dump(int mode, int resume, unsigned int us)
for (i = 0; i < reg_count; i++)
printk(KERN_INFO "%-20s: 0x%08x\n", regs[i].name, regs[i].val);
}
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+struct dentry *pm_dbg_dir;
+
+static int pm_dbg_init_done;
+
+enum {
+ DEBUG_FILE_COUNTERS = 0,
+ DEBUG_FILE_TIMERS,
+};
+
+static const char pwrdm_state_names[][4] = {
+ "OFF",
+ "RET",
+ "INA",
+ "ON"
+};
+
+void pm_dbg_update_time(struct powerdomain *pwrdm, int prev)
+{
+ s64 t;
+
+ if (!pm_dbg_init_done)
+ return ;
+
+ /* Update timer for previous state */
+ t = sched_clock();
+
+ pwrdm->state_timer[prev] += t - pwrdm->timer;
+
+ pwrdm->timer = t;
+}
+
+static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
+{
+ struct seq_file *s = (struct seq_file *)user;
+
+ if (strcmp(clkdm->name, "emu_clkdm") == 0 ||
+ strcmp(clkdm->name, "wkup_clkdm") == 0 ||
+ strncmp(clkdm->name, "dpll", 4) == 0)
+ return 0;
+
+ seq_printf(s, "%s->%s (%d)", clkdm->name,
+ clkdm->pwrdm.ptr->name,
+ atomic_read(&clkdm->usecount));
+ seq_printf(s, "\n");
+
+ return 0;
+}
+
+static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
+{
+ struct seq_file *s = (struct seq_file *)user;
+ int i;
+
+ if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
+ strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
+ strncmp(pwrdm->name, "dpll", 4) == 0)
+ return 0;
+
+ if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
+ printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d\n",
+ pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));
+
+ seq_printf(s, "%s (%s)", pwrdm->name,
+ pwrdm_state_names[pwrdm->state]);
+ for (i = 0; i < 4; i++)
+ seq_printf(s, ",%s:%d", pwrdm_state_names[i],
+ pwrdm->state_counter[i]);
+
+ seq_printf(s, "\n");
+
+ return 0;
+}
+
+static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
+{
+ struct seq_file *s = (struct seq_file *)user;
+ int i;
+
+ if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
+ strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
+ strncmp(pwrdm->name, "dpll", 4) == 0)
+ return 0;
+
+ pwrdm_state_switch(pwrdm);
+
+ seq_printf(s, "%s (%s)", pwrdm->name,
+ pwrdm_state_names[pwrdm->state]);
+
+ for (i = 0; i < 4; i++)
+ seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
+ pwrdm->state_timer[i]);
+
+ seq_printf(s, "\n");
+ return 0;
+}
+
+static int pm_dbg_show_counters(struct seq_file *s, void *unused)
+{
+ pwrdm_for_each(pwrdm_dbg_show_counter, s);
+ clkdm_for_each(clkdm_dbg_show_counter, s);
+
+ return 0;
+}
+
+static int pm_dbg_show_timers(struct seq_file *s, void *unused)
+{
+ pwrdm_for_each(pwrdm_dbg_show_timer, s);
+ return 0;
+}
+
+static int pm_dbg_open(struct inode *inode, struct file *file)
+{
+ switch ((int)inode->i_private) {
+ case DEBUG_FILE_COUNTERS:
+ return single_open(file, pm_dbg_show_counters,
+ &inode->i_private);
+ case DEBUG_FILE_TIMERS:
+ default:
+ return single_open(file, pm_dbg_show_timers,
+ &inode->i_private);
+ };
+}
+
+static const struct file_operations debug_fops = {
+ .open = pm_dbg_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
+{
+ int i;
+ s64 t;
+
+ t = sched_clock();
+
+ for (i = 0; i < 4; i++)
+ pwrdm->state_timer[i] = 0;
+
+ pwrdm->timer = t;
+
+ return 0;
+}
+
+static int __init pm_dbg_init(void)
+{
+ struct dentry *d;
+
+ d = debugfs_create_dir("pm_debug", NULL);
+ if (IS_ERR(d))
+ return PTR_ERR(d);
+
+ (void) debugfs_create_file("count", S_IRUGO,
+ d, (void *)DEBUG_FILE_COUNTERS, &debug_fops);
+ (void) debugfs_create_file("time", S_IRUGO,
+ d, (void *)DEBUG_FILE_TIMERS, &debug_fops);
+
+ pwrdm_for_each(pwrdms_setup, NULL);
+
+ pm_dbg_init_done = 1;
+
+ return 0;
+}
+late_initcall(pm_dbg_init);
+
+#else
+void pm_dbg_update_time(struct powerdomain *pwrdm, int prev) {}
+#endif