Re: [PATCH v16 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops
On 30 August 2018 at 16:45, Vivek Gautam wrote:
> From: Sricharan R
>
> The smmu needs to be functional only when the respective
> master's using it are active. The device_link feature
> helps to track such functional dependencies, so that the
> iommu gets powered when the master device enables itself
> using pm_runtime. So by adapting the smmu driver for
> runtime pm, above said dependency can be addressed.
>
> This patch adds the pm runtime/sleep callbacks to the
> driver and also the functions to parse the smmu clocks
> from DT and enable them in resume/suspend.
>
> Also, while we enable the runtime pm add a pm sleep suspend
> callback that pushes devices to low power state by turning
> the clocks off in a system sleep.
> Also add corresponding clock enable path in resume callback.
>
> Signed-off-by: Sricharan R
> Signed-off-by: Archit Taneja
> [vivek: rework for clock and pm ops]
> Signed-off-by: Vivek Gautam
> Reviewed-by: Tomasz Figa
> Tested-by: Srinivas Kandagatla
> ---
> drivers/iommu/arm-smmu.c | 77
> ++--
> 1 file changed, 74 insertions(+), 3 deletions(-)
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
[...]
> -static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
> +static int __maybe_unused arm_smmu_runtime_resume(struct device *dev)
> {
> struct arm_smmu_device *smmu = dev_get_drvdata(dev);
> + int ret;
> +
> + ret = clk_bulk_enable(smmu->num_clks, smmu->clks);
> + if (ret)
> + return ret;
>
> arm_smmu_device_reset(smmu);
> +
> return 0;
> }
>
> -static SIMPLE_DEV_PM_OPS(arm_smmu_pm_ops, NULL, arm_smmu_pm_resume);
> +static int __maybe_unused arm_smmu_runtime_suspend(struct device *dev)
> +{
> + struct arm_smmu_device *smmu = dev_get_drvdata(dev);
> +
> + clk_bulk_disable(smmu->num_clks, smmu->clks);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
> +{
> + if (pm_runtime_suspended(dev))
> + return 0;
Looks like you should be able use pm_runtime_force_resume(), instead
of using this local trick. Unless I am missing something, of course.
In other words, just assign the system sleep callbacks for resume, to
pm_runtime_force_resume(). And vice verse for the system suspend
callbacks, pm_runtime_force_suspend(), of course.
> +
> + return arm_smmu_runtime_resume(dev);
> +}
> +
> +static int __maybe_unused arm_smmu_pm_suspend(struct device *dev)
> +{
> + if (pm_runtime_suspended(dev))
> + return 0;
> +
> + return arm_smmu_runtime_suspend(dev);
> +}
> +
> +static const struct dev_pm_ops arm_smmu_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(arm_smmu_pm_suspend, arm_smmu_pm_resume)
I am wondering if using the ->suspend|resume() callback is really
"late/early" enough in the device suspend phase?
Others is using the noirq phase and some is even using the syscore
ops. Of course it depends on the behavior of the consumers of iommu
device, and I guess not everyone is using device links, which for sure
improves things in this regards as well.
> + SET_RUNTIME_PM_OPS(arm_smmu_runtime_suspend,
> + arm_smmu_runtime_resume, NULL)
> +};
>
> static struct platform_driver arm_smmu_driver = {
> .driver = {
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>
BTW, apologize for very late review comments.
Besides the above comments, the series looks good to me.
Kind regards
Uffe
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Re: [PATCH v16 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops
On Wed, Sep 26, 2018 at 8:57 PM Robin Murphy wrote:
>
> On 30/08/18 15:45, Vivek Gautam wrote:
> > From: Sricharan R
> >
> > The smmu needs to be functional only when the respective
> > master's using it are active. The device_link feature
> > helps to track such functional dependencies, so that the
> > iommu gets powered when the master device enables itself
> > using pm_runtime. So by adapting the smmu driver for
> > runtime pm, above said dependency can be addressed.
> >
> > This patch adds the pm runtime/sleep callbacks to the
> > driver and also the functions to parse the smmu clocks
> > from DT and enable them in resume/suspend.
> >
> > Also, while we enable the runtime pm add a pm sleep suspend
> > callback that pushes devices to low power state by turning
> > the clocks off in a system sleep.
> > Also add corresponding clock enable path in resume callback.
> >
> > Signed-off-by: Sricharan R
> > Signed-off-by: Archit Taneja
> > [vivek: rework for clock and pm ops]
> > Signed-off-by: Vivek Gautam
> > Reviewed-by: Tomasz Figa
> > Tested-by: Srinivas Kandagatla
> > ---
> > drivers/iommu/arm-smmu.c | 77
> > ++--
> > 1 file changed, 74 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> > index fd1b80ef9490..d900e007c3c9 100644
> > --- a/drivers/iommu/arm-smmu.c
> > +++ b/drivers/iommu/arm-smmu.c
> > @@ -48,6 +48,7 @@
> > #include
> > #include
> > #include
> > +#include
> > #include
> > #include
> >
> > @@ -205,6 +206,8 @@ struct arm_smmu_device {
> > u32 num_global_irqs;
> > u32 num_context_irqs;
> > unsigned int*irqs;
> > + struct clk_bulk_data*clks;
> > + int num_clks;
> >
> > u32 cavium_id_base; /* Specific to Cavium
> > */
> >
> > @@ -1896,10 +1899,12 @@ static int arm_smmu_device_cfg_probe(struct
> > arm_smmu_device *smmu)
> > struct arm_smmu_match_data {
> > enum arm_smmu_arch_version version;
> > enum arm_smmu_implementation model;
> > + const char * const *clks;
> > + int num_clks;
> > };
> >
> > #define ARM_SMMU_MATCH_DATA(name, ver, imp) \
> > -static struct arm_smmu_match_data name = { .version = ver, .model = imp }
> > +static const struct arm_smmu_match_data name = { .version = ver, .model =
> > imp }
> >
> > ARM_SMMU_MATCH_DATA(smmu_generic_v1, ARM_SMMU_V1, GENERIC_SMMU);
> > ARM_SMMU_MATCH_DATA(smmu_generic_v2, ARM_SMMU_V2, GENERIC_SMMU);
> > @@ -1918,6 +1923,23 @@ static const struct of_device_id arm_smmu_of_match[]
> > = {
> > };
> > MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
> >
> > +static void arm_smmu_fill_clk_data(struct arm_smmu_device *smmu,
> > +const char * const *clks)
> > +{
> > + int i;
> > +
> > + if (smmu->num_clks < 1)
> > + return;
> > +
> > + smmu->clks = devm_kcalloc(smmu->dev, smmu->num_clks,
> > + sizeof(*smmu->clks), GFP_KERNEL);
> > + if (!smmu->clks)
> > + return;
> > +
> > + for (i = 0; i < smmu->num_clks; i++)
> > + smmu->clks[i].id = clks[i];
> > +}
> > +
> > #ifdef CONFIG_ACPI
> > static int acpi_smmu_get_data(u32 model, struct arm_smmu_device *smmu)
> > {
> > @@ -2000,6 +2022,9 @@ static int arm_smmu_device_dt_probe(struct
> > platform_device *pdev,
> > data = of_device_get_match_data(dev);
> > smmu->version = data->version;
> > smmu->model = data->model;
> > + smmu->num_clks = data->num_clks;
> > +
> > + arm_smmu_fill_clk_data(smmu, data->clks);
> >
> > parse_driver_options(smmu);
> >
> > @@ -2098,6 +2123,14 @@ static int arm_smmu_device_probe(struct
> > platform_device *pdev)
> > smmu->irqs[i] = irq;
> > }
> >
> > + err = devm_clk_bulk_get(smmu->dev, smmu->num_clks, smmu->clks);
> > + if (err)
> > + return err;
> > +
> > + err = clk_bulk_prepare_enable(smmu->num_clks, smmu->clks);
> > + if (err)
> > + return err;
> > +
>
> Hmm, if we error out beyond here it looks like we should strictly
> balance that prepare/enable before devres does the clk_bulk_put(),
> however the probe error path is starting to look like it needs a bit of
> love in general, so I might just spin a cleanup patch on top (and even
> then only for the sake of not being a bad example; SMMU probe failure is
> never a realistic situation for the system to actually recover from).
Sure Robin. Thanks for the review on the series.
Let me know, I can spin a change for probe failure path cleanup.
Best regards
Vivek
>
> Otherwise,
>
> Reviewed-by: Robin Murphy
>
> > err = arm_smmu_device_cfg_probe(smmu);
> > if (err)
> > return err;
> > @@ -2184,6 +2217,9 @@ static int arm_smmu_device_remove(struct
> > platform_device
Re: [PATCH v16 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops
On 30/08/18 15:45, Vivek Gautam wrote:
From: Sricharan R
The smmu needs to be functional only when the respective
master's using it are active. The device_link feature
helps to track such functional dependencies, so that the
iommu gets powered when the master device enables itself
using pm_runtime. So by adapting the smmu driver for
runtime pm, above said dependency can be addressed.
This patch adds the pm runtime/sleep callbacks to the
driver and also the functions to parse the smmu clocks
from DT and enable them in resume/suspend.
Also, while we enable the runtime pm add a pm sleep suspend
callback that pushes devices to low power state by turning
the clocks off in a system sleep.
Also add corresponding clock enable path in resume callback.
Signed-off-by: Sricharan R
Signed-off-by: Archit Taneja
[vivek: rework for clock and pm ops]
Signed-off-by: Vivek Gautam
Reviewed-by: Tomasz Figa
Tested-by: Srinivas Kandagatla
---
drivers/iommu/arm-smmu.c | 77 ++--
1 file changed, 74 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index fd1b80ef9490..d900e007c3c9 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -48,6 +48,7 @@
#include
#include
#include
+#include
#include
#include
@@ -205,6 +206,8 @@ struct arm_smmu_device {
u32 num_global_irqs;
u32 num_context_irqs;
unsigned int*irqs;
+ struct clk_bulk_data*clks;
+ int num_clks;
u32cavium_id_base; /* Specific to Cavium */
@@ -1896,10 +1899,12 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
struct arm_smmu_match_data {
enum arm_smmu_arch_version version;
enum arm_smmu_implementation model;
+ const char * const *clks;
+ int num_clks;
};
#define ARM_SMMU_MATCH_DATA(name, ver, imp) \
-static struct arm_smmu_match_data name = { .version = ver, .model = imp }
+static const struct arm_smmu_match_data name = { .version = ver, .model = imp }
ARM_SMMU_MATCH_DATA(smmu_generic_v1, ARM_SMMU_V1, GENERIC_SMMU);
ARM_SMMU_MATCH_DATA(smmu_generic_v2, ARM_SMMU_V2, GENERIC_SMMU);
@@ -1918,6 +1923,23 @@ static const struct of_device_id arm_smmu_of_match[] = {
};
MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
+static void arm_smmu_fill_clk_data(struct arm_smmu_device *smmu,
+ const char * const *clks)
+{
+ int i;
+
+ if (smmu->num_clks < 1)
+ return;
+
+ smmu->clks = devm_kcalloc(smmu->dev, smmu->num_clks,
+ sizeof(*smmu->clks), GFP_KERNEL);
+ if (!smmu->clks)
+ return;
+
+ for (i = 0; i < smmu->num_clks; i++)
+ smmu->clks[i].id = clks[i];
+}
+
#ifdef CONFIG_ACPI
static int acpi_smmu_get_data(u32 model, struct arm_smmu_device *smmu)
{
@@ -2000,6 +2022,9 @@ static int arm_smmu_device_dt_probe(struct
platform_device *pdev,
data = of_device_get_match_data(dev);
smmu->version = data->version;
smmu->model = data->model;
+ smmu->num_clks = data->num_clks;
+
+ arm_smmu_fill_clk_data(smmu, data->clks);
parse_driver_options(smmu);
@@ -2098,6 +2123,14 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
smmu->irqs[i] = irq;
}
+ err = devm_clk_bulk_get(smmu->dev, smmu->num_clks, smmu->clks);
+ if (err)
+ return err;
+
+ err = clk_bulk_prepare_enable(smmu->num_clks, smmu->clks);
+ if (err)
+ return err;
+
Hmm, if we error out beyond here it looks like we should strictly
balance that prepare/enable before devres does the clk_bulk_put(),
however the probe error path is starting to look like it needs a bit of
love in general, so I might just spin a cleanup patch on top (and even
then only for the sake of not being a bad example; SMMU probe failure is
never a realistic situation for the system to actually recover from).
Otherwise,
Reviewed-by: Robin Murphy
err = arm_smmu_device_cfg_probe(smmu);
if (err)
return err;
@@ -2184,6 +2217,9 @@ static int arm_smmu_device_remove(struct platform_device
*pdev)
/* Turn the thing off */
writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
+
+ clk_bulk_disable_unprepare(smmu->num_clks, smmu->clks);
+
return 0;
}
@@ -2192,15 +2228,50 @@ static void arm_smmu_device_shutdown(struct platform_device *pdev)
arm_smmu_device_remove(pdev);
}
-static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
+static int __maybe_unused arm_smmu_runtime_resume(struct device *dev)
{
struct arm_smmu_device *smmu = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_bulk_enable(smmu->num_clks, smmu->clks);
[PATCH v16 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops
From: Sricharan R
The smmu needs to be functional only when the respective
master's using it are active. The device_link feature
helps to track such functional dependencies, so that the
iommu gets powered when the master device enables itself
using pm_runtime. So by adapting the smmu driver for
runtime pm, above said dependency can be addressed.
This patch adds the pm runtime/sleep callbacks to the
driver and also the functions to parse the smmu clocks
from DT and enable them in resume/suspend.
Also, while we enable the runtime pm add a pm sleep suspend
callback that pushes devices to low power state by turning
the clocks off in a system sleep.
Also add corresponding clock enable path in resume callback.
Signed-off-by: Sricharan R
Signed-off-by: Archit Taneja
[vivek: rework for clock and pm ops]
Signed-off-by: Vivek Gautam
Reviewed-by: Tomasz Figa
Tested-by: Srinivas Kandagatla
---
drivers/iommu/arm-smmu.c | 77 ++--
1 file changed, 74 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index fd1b80ef9490..d900e007c3c9 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -48,6 +48,7 @@
#include
#include
#include
+#include
#include
#include
@@ -205,6 +206,8 @@ struct arm_smmu_device {
u32 num_global_irqs;
u32 num_context_irqs;
unsigned int*irqs;
+ struct clk_bulk_data*clks;
+ int num_clks;
u32 cavium_id_base; /* Specific to Cavium */
@@ -1896,10 +1899,12 @@ static int arm_smmu_device_cfg_probe(struct
arm_smmu_device *smmu)
struct arm_smmu_match_data {
enum arm_smmu_arch_version version;
enum arm_smmu_implementation model;
+ const char * const *clks;
+ int num_clks;
};
#define ARM_SMMU_MATCH_DATA(name, ver, imp)\
-static struct arm_smmu_match_data name = { .version = ver, .model = imp }
+static const struct arm_smmu_match_data name = { .version = ver, .model = imp }
ARM_SMMU_MATCH_DATA(smmu_generic_v1, ARM_SMMU_V1, GENERIC_SMMU);
ARM_SMMU_MATCH_DATA(smmu_generic_v2, ARM_SMMU_V2, GENERIC_SMMU);
@@ -1918,6 +1923,23 @@ static const struct of_device_id arm_smmu_of_match[] = {
};
MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
+static void arm_smmu_fill_clk_data(struct arm_smmu_device *smmu,
+ const char * const *clks)
+{
+ int i;
+
+ if (smmu->num_clks < 1)
+ return;
+
+ smmu->clks = devm_kcalloc(smmu->dev, smmu->num_clks,
+ sizeof(*smmu->clks), GFP_KERNEL);
+ if (!smmu->clks)
+ return;
+
+ for (i = 0; i < smmu->num_clks; i++)
+ smmu->clks[i].id = clks[i];
+}
+
#ifdef CONFIG_ACPI
static int acpi_smmu_get_data(u32 model, struct arm_smmu_device *smmu)
{
@@ -2000,6 +2022,9 @@ static int arm_smmu_device_dt_probe(struct
platform_device *pdev,
data = of_device_get_match_data(dev);
smmu->version = data->version;
smmu->model = data->model;
+ smmu->num_clks = data->num_clks;
+
+ arm_smmu_fill_clk_data(smmu, data->clks);
parse_driver_options(smmu);
@@ -2098,6 +2123,14 @@ static int arm_smmu_device_probe(struct platform_device
*pdev)
smmu->irqs[i] = irq;
}
+ err = devm_clk_bulk_get(smmu->dev, smmu->num_clks, smmu->clks);
+ if (err)
+ return err;
+
+ err = clk_bulk_prepare_enable(smmu->num_clks, smmu->clks);
+ if (err)
+ return err;
+
err = arm_smmu_device_cfg_probe(smmu);
if (err)
return err;
@@ -2184,6 +2217,9 @@ static int arm_smmu_device_remove(struct platform_device
*pdev)
/* Turn the thing off */
writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
+
+ clk_bulk_disable_unprepare(smmu->num_clks, smmu->clks);
+
return 0;
}
@@ -2192,15 +2228,50 @@ static void arm_smmu_device_shutdown(struct
platform_device *pdev)
arm_smmu_device_remove(pdev);
}
-static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
+static int __maybe_unused arm_smmu_runtime_resume(struct device *dev)
{
struct arm_smmu_device *smmu = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_bulk_enable(smmu->num_clks, smmu->clks);
+ if (ret)
+ return ret;
arm_smmu_device_reset(smmu);
+
return 0;
}
-static SIMPLE_DEV_PM_OPS(arm_smmu_pm_ops, NULL, arm_smmu_pm_resume);
+static int __maybe_unused arm_smmu_runtime_suspend(struct device *dev)
+{
+ struct arm_smmu_device *smmu = dev_get_drvdata(dev);
+
+ clk_bulk_disable(smmu->num_clks, smmu->clks);
+
+ return 0;
+}
+
+static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
+{
+ if
