PM / Domains: Make it possible to assign names to generic PM domains

Add a name member pointer to struct generic_pm_domain and use it in
diagnostic messages regarding the domain power-off and power-on
latencies.  Update the ARM shmobile SH7372 code to assign names to
the PM domains used by it.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>

diff --git a/arch/arm/mach-shmobile/pm-sh7372.c b/arch/arm/mach-shmobile/pm-sh7372.c
index adf1765..8d9ea89 100644 (file)
--- a/arch/arm/mach-shmobile/pm-sh7372.c
+++ b/arch/arm/mach-shmobile/pm-sh7372.c
@@ -101,8 +101,8 @@ static int pd_power_down(struct generic_pm_domain *genpd)
        }
 
        if (!sh7372_pd->no_debug)
-               pr_debug("sh7372 power domain down 0x%08x -> PSTR = 0x%08x\n",
-                        mask, __raw_readl(PSTR));
+               pr_debug("%s: Power off, 0x%08x -> PSTR = 0x%08x\n",
+                        genpd->name, mask, __raw_readl(PSTR));
 
        return 0;
 }
@@ -133,8 +133,8 @@ static int __pd_power_up(struct sh7372_pm_domain *sh7372_pd, bool do_resume)
                ret = -EIO;
 
        if (!sh7372_pd->no_debug)
-               pr_debug("sh7372 power domain up 0x%08x -> PSTR = 0x%08x\n",
-                        mask, __raw_readl(PSTR));
+               pr_debug("%s: Power on, 0x%08x -> PSTR = 0x%08x\n",
+                        sh7372_pd->genpd.name, mask, __raw_readl(PSTR));
 
  out:
        if (ret == 0 && sh7372_pd->resume && do_resume)
@@ -233,18 +233,22 @@ void sh7372_pm_add_subdomain(struct sh7372_pm_domain *sh7372_pd,
 }
 
 struct sh7372_pm_domain sh7372_a4lc = {
+       .genpd.name = "A4LC",
        .bit_shift = 1,
 };
 
 struct sh7372_pm_domain sh7372_a4mp = {
+       .genpd.name = "A4MP",
        .bit_shift = 2,
 };
 
 struct sh7372_pm_domain sh7372_d4 = {
+       .genpd.name = "D4",
        .bit_shift = 3,
 };
 
 struct sh7372_pm_domain sh7372_a4r = {
+       .genpd.name = "A4R",
        .bit_shift = 5,
        .gov = &sh7372_always_on_gov,
        .suspend = sh7372_a4r_suspend,
@@ -253,14 +257,17 @@ struct sh7372_pm_domain sh7372_a4r = {
 };
 
 struct sh7372_pm_domain sh7372_a3rv = {
+       .genpd.name = "A3RV",
        .bit_shift = 6,
 };
 
 struct sh7372_pm_domain sh7372_a3ri = {
+       .genpd.name = "A3RI",
        .bit_shift = 8,
 };
 
 struct sh7372_pm_domain sh7372_a3sp = {
+       .genpd.name = "A3SP",
        .bit_shift = 11,
        .gov = &sh7372_always_on_gov,
        .no_debug = true,
@@ -275,6 +282,7 @@ static void sh7372_a3sp_init(void)
 }
 
 struct sh7372_pm_domain sh7372_a3sg = {
+       .genpd.name = "A3SG",
        .bit_shift = 13,
 };
 

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 5a8d67d..ad6ba2e 100644 (file)
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -209,8 +209,13 @@ int __pm_genpd_poweron(struct generic_pm_domain *genpd)
                        goto err;
 
                elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
-               if (elapsed_ns > genpd->power_on_latency_ns)
+               if (elapsed_ns > genpd->power_on_latency_ns) {
                        genpd->power_on_latency_ns = elapsed_ns;
+                       if (genpd->name)
+                               pr_warning("%s: Power-on latency exceeded, "
+                                       "new value %lld ns\n", genpd->name,
+                                       elapsed_ns);
+               }
        }
 
        genpd_set_active(genpd);
@@ -428,8 +433,13 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
                }
 
                elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
-               if (elapsed_ns > genpd->power_off_latency_ns)
+               if (elapsed_ns > genpd->power_off_latency_ns) {
                        genpd->power_off_latency_ns = elapsed_ns;
+                       if (genpd->name)
+                               pr_warning("%s: Power-off latency exceeded, "
+                                       "new value %lld ns\n", genpd->name,
+                                       elapsed_ns);
+               }
        }
 
        genpd->status = GPD_STATE_POWER_OFF;

diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index fbb81bc..fb809b9 100644 (file)
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -50,6 +50,7 @@ struct generic_pm_domain {
        struct mutex lock;
        struct dev_power_governor *gov;
        struct work_struct power_off_work;
+       char *name;
        unsigned int in_progress;       /* Number of devices being suspended now */
        atomic_t sd_count;      /* Number of subdomains with power "on" */
        enum gpd_status status; /* Current state of the domain */