| Message ID | 1475879821-8035-2-git-send-email-lina.iyer@linaro.org |
|---|---|
| State | New |
| Headers | show |
On 8 October 2016 at 00:36, Lina Iyer <lina.iyer@linaro.org> wrote: > Allow PM Domain states to be defined dynamically by the drivers. This > removes the limitation on the maximum number of states possible for a > domain. > > Cc: Axel Haslam <ahaslam+renesas@baylibre.com> > Suggested-by: Ulf Hansson <ulf.hansson@linaro.org> > Signed-off-by: Lina Iyer <lina.iyer@linaro.org> > --- > arch/arm/mach-imx/gpc.c | 17 ++++++++++------- > drivers/base/power/domain.c | 36 ++++++++++++++++++++++++------------ > include/linux/pm_domain.h | 5 ++--- > 3 files changed, 36 insertions(+), 22 deletions(-) > > diff --git a/arch/arm/mach-imx/gpc.c b/arch/arm/mach-imx/gpc.c > index 0df062d..57a410b 100644 > --- a/arch/arm/mach-imx/gpc.c > +++ b/arch/arm/mach-imx/gpc.c > @@ -380,13 +380,6 @@ static struct pu_domain imx6q_pu_domain = { > .name = "PU", > .power_off = imx6q_pm_pu_power_off, > .power_on = imx6q_pm_pu_power_on, > - .states = { > - [0] = { > - .power_off_latency_ns = 25000, > - .power_on_latency_ns = 2000000, > - }, > - }, > - .state_count = 1, > }, > }; > > @@ -430,6 +423,16 @@ static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg) > if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) > return 0; > > + imx6q_pu_domain.base.states = devm_kzalloc(dev, > + sizeof(*imx6q_pu_domain.base.states), > + GFP_KERNEL); > + if (!imx6q_pu_domain.base.states) > + return -ENOMEM; > + > + imx6q_pu_domain.base.states[0].power_off_latency_ns = 25000; > + imx6q_pu_domain.base.states[0].power_on_latency_ns = 2000000; > + imx6q_pu_domain.base.state_count = 1; > + > pm_genpd_init(&imx6q_pu_domain.base, NULL, false); > return of_genpd_add_provider_onecell(dev->of_node, > &imx_gpc_onecell_data); > diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c > index e023066..4e87170 100644 > --- a/drivers/base/power/domain.c > +++ b/drivers/base/power/domain.c > @@ -1282,6 +1282,21 @@ out: > } > EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); > > +static int genpd_set_default_power_state(struct generic_pm_domain *genpd) > +{ > + struct genpd_power_state *state; > + > + state = kzalloc(sizeof(*state), GFP_KERNEL); > + if (!state) > + return -ENOMEM; > + > + genpd->states = state; > + genpd->state_count = 1; > + genpd->free = state; > + > + return 0; > +} > + > /** > * pm_genpd_init - Initialize a generic I/O PM domain object. > * @genpd: PM domain object to initialize. > @@ -1293,6 +1308,8 @@ EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); > int pm_genpd_init(struct generic_pm_domain *genpd, > struct dev_power_governor *gov, bool is_off) > { > + int ret; > + > if (IS_ERR_OR_NULL(genpd)) > return -EINVAL; > > @@ -1325,19 +1342,12 @@ int pm_genpd_init(struct generic_pm_domain *genpd, > genpd->dev_ops.start = pm_clk_resume; > } > > - if (genpd->state_idx >= GENPD_MAX_NUM_STATES) { > - pr_warn("Initial state index out of bounds.\n"); > - genpd->state_idx = GENPD_MAX_NUM_STATES - 1; > - } > - > - if (genpd->state_count > GENPD_MAX_NUM_STATES) { > - pr_warn("Limiting states to %d\n", GENPD_MAX_NUM_STATES); > - genpd->state_count = GENPD_MAX_NUM_STATES; > - } > - > /* Use only one "off" state if there were no states declared */ > - if (genpd->state_count == 0) > - genpd->state_count = 1; > + if (genpd->state_count == 0) { > + ret = genpd_set_default_power_state(genpd); > + if (ret) > + return ret; > + } > > mutex_lock(&gpd_list_lock); > list_add(&genpd->gpd_list_node, &gpd_list); > @@ -1374,6 +1384,8 @@ static int genpd_remove(struct generic_pm_domain *genpd) > kfree(link); > } > > + kfree(genpd->free); > + To be safe, let's move this after cancel_work_sync() - as to prevent no accesses is made to ->states pointer after you have freed it. > list_del(&genpd->gpd_list_node); > mutex_unlock(&genpd->lock); > cancel_work_sync(&genpd->power_off_work); > diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h > index a09fe5c..de1d8f3 100644 > --- a/include/linux/pm_domain.h > +++ b/include/linux/pm_domain.h > @@ -19,8 +19,6 @@ > /* Defines used for the flags field in the struct generic_pm_domain */ > #define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */ > > -#define GENPD_MAX_NUM_STATES 8 /* Number of possible low power states */ > - > enum gpd_status { > GPD_STATE_ACTIVE = 0, /* PM domain is active */ > GPD_STATE_POWER_OFF, /* PM domain is off */ > @@ -70,9 +68,10 @@ struct generic_pm_domain { > void (*detach_dev)(struct generic_pm_domain *domain, > struct device *dev); > unsigned int flags; /* Bit field of configs for genpd */ > - struct genpd_power_state states[GENPD_MAX_NUM_STATES]; > + struct genpd_power_state *states; > unsigned int state_count; /* number of states */ > unsigned int state_idx; /* state that genpd will go to when off */ > + void *free; /* Free the state that was allocated for default */ > > }; > > -- > 2.7.4 > After the minor change suggested above, you may add my ack. Kind regards Uffe
On Mon, Oct 10 2016 at 02:40 -0600, Ulf Hansson wrote: >On 8 October 2016 at 00:36, Lina Iyer <lina.iyer@linaro.org> wrote: >> Allow PM Domain states to be defined dynamically by the drivers. This >> removes the limitation on the maximum number of states possible for a >> domain. >> >> Cc: Axel Haslam <ahaslam+renesas@baylibre.com> >> Suggested-by: Ulf Hansson <ulf.hansson@linaro.org> >> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> >> --- >> arch/arm/mach-imx/gpc.c | 17 ++++++++++------- >> drivers/base/power/domain.c | 36 ++++++++++++++++++++++++------------ >> include/linux/pm_domain.h | 5 ++--- >> 3 files changed, 36 insertions(+), 22 deletions(-) >> >> diff --git a/arch/arm/mach-imx/gpc.c b/arch/arm/mach-imx/gpc.c >> index 0df062d..57a410b 100644 >> --- a/arch/arm/mach-imx/gpc.c >> +++ b/arch/arm/mach-imx/gpc.c >> @@ -380,13 +380,6 @@ static struct pu_domain imx6q_pu_domain = { >> .name = "PU", >> .power_off = imx6q_pm_pu_power_off, >> .power_on = imx6q_pm_pu_power_on, >> - .states = { >> - [0] = { >> - .power_off_latency_ns = 25000, >> - .power_on_latency_ns = 2000000, >> - }, >> - }, >> - .state_count = 1, >> }, >> }; >> >> @@ -430,6 +423,16 @@ static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg) >> if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) >> return 0; >> >> + imx6q_pu_domain.base.states = devm_kzalloc(dev, >> + sizeof(*imx6q_pu_domain.base.states), >> + GFP_KERNEL); >> + if (!imx6q_pu_domain.base.states) >> + return -ENOMEM; >> + >> + imx6q_pu_domain.base.states[0].power_off_latency_ns = 25000; >> + imx6q_pu_domain.base.states[0].power_on_latency_ns = 2000000; >> + imx6q_pu_domain.base.state_count = 1; >> + >> pm_genpd_init(&imx6q_pu_domain.base, NULL, false); >> return of_genpd_add_provider_onecell(dev->of_node, >> &imx_gpc_onecell_data); >> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c >> index e023066..4e87170 100644 >> --- a/drivers/base/power/domain.c >> +++ b/drivers/base/power/domain.c >> @@ -1282,6 +1282,21 @@ out: >> } >> EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); >> >> +static int genpd_set_default_power_state(struct generic_pm_domain *genpd) >> +{ >> + struct genpd_power_state *state; >> + >> + state = kzalloc(sizeof(*state), GFP_KERNEL); >> + if (!state) >> + return -ENOMEM; >> + >> + genpd->states = state; >> + genpd->state_count = 1; >> + genpd->free = state; >> + >> + return 0; >> +} >> + >> /** >> * pm_genpd_init - Initialize a generic I/O PM domain object. >> * @genpd: PM domain object to initialize. >> @@ -1293,6 +1308,8 @@ EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); >> int pm_genpd_init(struct generic_pm_domain *genpd, >> struct dev_power_governor *gov, bool is_off) >> { >> + int ret; >> + >> if (IS_ERR_OR_NULL(genpd)) >> return -EINVAL; >> >> @@ -1325,19 +1342,12 @@ int pm_genpd_init(struct generic_pm_domain *genpd, >> genpd->dev_ops.start = pm_clk_resume; >> } >> >> - if (genpd->state_idx >= GENPD_MAX_NUM_STATES) { >> - pr_warn("Initial state index out of bounds.\n"); >> - genpd->state_idx = GENPD_MAX_NUM_STATES - 1; >> - } >> - >> - if (genpd->state_count > GENPD_MAX_NUM_STATES) { >> - pr_warn("Limiting states to %d\n", GENPD_MAX_NUM_STATES); >> - genpd->state_count = GENPD_MAX_NUM_STATES; >> - } >> - >> /* Use only one "off" state if there were no states declared */ >> - if (genpd->state_count == 0) >> - genpd->state_count = 1; >> + if (genpd->state_count == 0) { >> + ret = genpd_set_default_power_state(genpd); >> + if (ret) >> + return ret; >> + } >> >> mutex_lock(&gpd_list_lock); >> list_add(&genpd->gpd_list_node, &gpd_list); >> @@ -1374,6 +1384,8 @@ static int genpd_remove(struct generic_pm_domain *genpd) >> kfree(link); >> } >> >> + kfree(genpd->free); >> + > >To be safe, let's move this after cancel_work_sync() - as to prevent >no accesses is made to ->states pointer after you have freed it. > OK Thanks, Lina >> list_del(&genpd->gpd_list_node); >> mutex_unlock(&genpd->lock); >> cancel_work_sync(&genpd->power_off_work); >> diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h >> index a09fe5c..de1d8f3 100644 >> --- a/include/linux/pm_domain.h >> +++ b/include/linux/pm_domain.h >> @@ -19,8 +19,6 @@ >> /* Defines used for the flags field in the struct generic_pm_domain */ >> #define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */ >> >> -#define GENPD_MAX_NUM_STATES 8 /* Number of possible low power states */ >> - >> enum gpd_status { >> GPD_STATE_ACTIVE = 0, /* PM domain is active */ >> GPD_STATE_POWER_OFF, /* PM domain is off */ >> @@ -70,9 +68,10 @@ struct generic_pm_domain { >> void (*detach_dev)(struct generic_pm_domain *domain, >> struct device *dev); >> unsigned int flags; /* Bit field of configs for genpd */ >> - struct genpd_power_state states[GENPD_MAX_NUM_STATES]; >> + struct genpd_power_state *states; >> unsigned int state_count; /* number of states */ >> unsigned int state_idx; /* state that genpd will go to when off */ >> + void *free; /* Free the state that was allocated for default */ >> >> }; >> >> -- >> 2.7.4 >> > >After the minor change suggested above, you may add my ack. > >Kind regards >Uffe
diff --git a/arch/arm/mach-imx/gpc.c b/arch/arm/mach-imx/gpc.c index 0df062d..57a410b 100644 --- a/arch/arm/mach-imx/gpc.c +++ b/arch/arm/mach-imx/gpc.c @@ -380,13 +380,6 @@ static struct pu_domain imx6q_pu_domain = { .name = "PU", .power_off = imx6q_pm_pu_power_off, .power_on = imx6q_pm_pu_power_on, - .states = { - [0] = { - .power_off_latency_ns = 25000, - .power_on_latency_ns = 2000000, - }, - }, - .state_count = 1, }, }; @@ -430,6 +423,16 @@ static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg) if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) return 0; + imx6q_pu_domain.base.states = devm_kzalloc(dev, + sizeof(*imx6q_pu_domain.base.states), + GFP_KERNEL); + if (!imx6q_pu_domain.base.states) + return -ENOMEM; + + imx6q_pu_domain.base.states[0].power_off_latency_ns = 25000; + imx6q_pu_domain.base.states[0].power_on_latency_ns = 2000000; + imx6q_pu_domain.base.state_count = 1; + pm_genpd_init(&imx6q_pu_domain.base, NULL, false); return of_genpd_add_provider_onecell(dev->of_node, &imx_gpc_onecell_data); diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index e023066..4e87170 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1282,6 +1282,21 @@ out: } EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); +static int genpd_set_default_power_state(struct generic_pm_domain *genpd) +{ + struct genpd_power_state *state; + + state = kzalloc(sizeof(*state), GFP_KERNEL); + if (!state) + return -ENOMEM; + + genpd->states = state; + genpd->state_count = 1; + genpd->free = state; + + return 0; +} + /** * pm_genpd_init - Initialize a generic I/O PM domain object. * @genpd: PM domain object to initialize. @@ -1293,6 +1308,8 @@ EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); int pm_genpd_init(struct generic_pm_domain *genpd, struct dev_power_governor *gov, bool is_off) { + int ret; + if (IS_ERR_OR_NULL(genpd)) return -EINVAL; @@ -1325,19 +1342,12 @@ int pm_genpd_init(struct generic_pm_domain *genpd, genpd->dev_ops.start = pm_clk_resume; } - if (genpd->state_idx >= GENPD_MAX_NUM_STATES) { - pr_warn("Initial state index out of bounds.\n"); - genpd->state_idx = GENPD_MAX_NUM_STATES - 1; - } - - if (genpd->state_count > GENPD_MAX_NUM_STATES) { - pr_warn("Limiting states to %d\n", GENPD_MAX_NUM_STATES); - genpd->state_count = GENPD_MAX_NUM_STATES; - } - /* Use only one "off" state if there were no states declared */ - if (genpd->state_count == 0) - genpd->state_count = 1; + if (genpd->state_count == 0) { + ret = genpd_set_default_power_state(genpd); + if (ret) + return ret; + } mutex_lock(&gpd_list_lock); list_add(&genpd->gpd_list_node, &gpd_list); @@ -1374,6 +1384,8 @@ static int genpd_remove(struct generic_pm_domain *genpd) kfree(link); } + kfree(genpd->free); + list_del(&genpd->gpd_list_node); mutex_unlock(&genpd->lock); cancel_work_sync(&genpd->power_off_work); diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index a09fe5c..de1d8f3 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -19,8 +19,6 @@ /* Defines used for the flags field in the struct generic_pm_domain */ #define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */ -#define GENPD_MAX_NUM_STATES 8 /* Number of possible low power states */ - enum gpd_status { GPD_STATE_ACTIVE = 0, /* PM domain is active */ GPD_STATE_POWER_OFF, /* PM domain is off */ @@ -70,9 +68,10 @@ struct generic_pm_domain { void (*detach_dev)(struct generic_pm_domain *domain, struct device *dev); unsigned int flags; /* Bit field of configs for genpd */ - struct genpd_power_state states[GENPD_MAX_NUM_STATES]; + struct genpd_power_state *states; unsigned int state_count; /* number of states */ unsigned int state_idx; /* state that genpd will go to when off */ + void *free; /* Free the state that was allocated for default */ };
Allow PM Domain states to be defined dynamically by the drivers. This removes the limitation on the maximum number of states possible for a domain. Cc: Axel Haslam <ahaslam+renesas@baylibre.com> Suggested-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> --- arch/arm/mach-imx/gpc.c | 17 ++++++++++------- drivers/base/power/domain.c | 36 ++++++++++++++++++++++++------------ include/linux/pm_domain.h | 5 ++--- 3 files changed, 36 insertions(+), 22 deletions(-)