[PATCH v18 0/5] iommu/arm-smmu: Add runtime pm/sleep support

[PATCH v18 0/5] iommu/arm-smmu: Add runtime pm/sleep support

[Vivek Gautam]

Looks like this is going to be the final respin before this support
finally lands.
The change isn't much from v17_resend series [1] besides taking
Thor's change [2] for clocks.

Changes since v17:
 - Addressing Will's comment to embed Thor's change [2] for pulling
   clocks information from device tree. This is done by squashing
   Thor's change [2] in v17's 1/5 patch [3].
 - Another minor change is addition of runtime pm hooks to
   arm_smmu_iova_to_phys_hard().

Previous version of this patch series is @ [1].
Also refer to [4] for change logs for previous versions.

[1] https://lore.kernel.org/patchwork/cover/1013166/
[2] https://lore.kernel.org/patchwork/patch/996143/
[3] https://lore.kernel.org/patchwork/patch/1013167/
[4] https://lore.kernel.org/patchwork/cover/979429/

Sricharan R (3):
  iommu/arm-smmu: Add pm_runtime/sleep ops
  iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device
  iommu/arm-smmu: Add the device_link between masters and smmu

Vivek Gautam (2):
  dt-bindings: arm-smmu: Add bindings for qcom,smmu-v2
  iommu/arm-smmu: Add support for qcom,smmu-v2 variant

 .../devicetree/bindings/iommu/arm,smmu.txt         |  39 ++++
 drivers/iommu/arm-smmu.c                           | 212 +++++++++++++++++++--
 2 files changed, 239 insertions(+), 12 deletions(-)

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[PATCH v18 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops

[Vivek Gautam]

From: Sricharan R <sricharan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>

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.
We pull all the information about clocks from device tree.

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 <sricharan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
Signed-off-by: Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
[Thor: Rework to get clocks from device tree]
Signed-off-by: Thor Thayer <thor.thayer-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
[vivek: rework for clock and pm ops]
Signed-off-by: Vivek Gautam <vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
Reviewed-by: Tomasz Figa <tfiga-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Reviewed-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
 drivers/iommu/arm-smmu.c | 100 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 97 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 5a28ae892504..e47c840fc6a8 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -44,10 +44,12 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/of_clk.h>
 #include <linux/of_device.h>
 #include <linux/of_iommu.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 
@@ -206,6 +208,8 @@ 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 */
 
@@ -1947,7 +1951,7 @@ struct arm_smmu_match_data {
 };
 
 #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);
@@ -1966,6 +1970,23 @@ 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)
 {
@@ -2038,6 +2059,7 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev,
 	const struct arm_smmu_match_data *data;
 	struct device *dev = &pdev->dev;
 	bool legacy_binding;
+	const char **parent_names;
 
 	if (of_property_read_u32(dev->of_node, "#global-interrupts",
 				 &smmu->num_global_irqs)) {
@@ -2048,6 +2070,26 @@ 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 = of_clk_get_parent_count(dev->of_node);
+	/* check to see if clocks were specified in DT */
+	if (smmu->num_clks) {
+		unsigned int i;
+
+		parent_names = kmalloc_array(smmu->num_clks,
+					     sizeof(*parent_names),
+					     GFP_KERNEL);
+		if (!parent_names)
+			return -ENOMEM;
+
+		for (i = 0; i < smmu->num_clks; i++) {
+			if (of_property_read_string_index(dev->of_node,
+							  "clock-names", i,
+							  &parent_names[i]))
+				goto fail_clk_name;
+		}
+		arm_smmu_fill_clk_data(smmu, parent_names);
+		kfree(parent_names);
+	}
 
 	parse_driver_options(smmu);
 
@@ -2067,6 +2109,12 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev,
 		smmu->features |= ARM_SMMU_FEAT_COHERENT_WALK;
 
 	return 0;
+
+fail_clk_name:
+	kfree(parent_names);
+	/* clock-names required for clocks in devm_clk_bulk_get() */
+	dev_err(dev, "clock-names required in device tree\n");
+	return -ENODEV;
 }
 
 static void arm_smmu_bus_init(void)
@@ -2150,6 +2198,14 @@ 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;
@@ -2236,6 +2292,9 @@ 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;
 }
 
@@ -2244,15 +2303,50 @@ 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 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 SIMPLE_DEV_PM_OPS(arm_smmu_pm_ops, NULL, arm_smmu_pm_resume);
+static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
+{
+	if (pm_runtime_suspended(dev))
+		return 0;
+
+	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)
+	SET_RUNTIME_PM_OPS(arm_smmu_runtime_suspend,
+			   arm_smmu_runtime_resume, NULL)
+};
 
 static struct platform_driver arm_smmu_driver = {
 	.driver	= {
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Re: [PATCH v18 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops

[Thor Thayer]

On 11/27/18 4:11 AM, Vivek Gautam wrote:
> From: Sricharan R <sricharan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> 
> 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.
> We pull all the information about clocks from device tree.
> 
> 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 <sricharan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> Signed-off-by: Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> [Thor: Rework to get clocks from device tree]
> Signed-off-by: Thor Thayer <thor.thayer-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> [vivek: rework for clock and pm ops]
> Signed-off-by: Vivek Gautam <vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> Reviewed-by: Tomasz Figa <tfiga-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> Tested-by: Srinivas Kandagatla <srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> Reviewed-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
> ---
>   drivers/iommu/arm-smmu.c | 100 +++++++++++++++++++++++++++++++++++++++++++++--
>   1 file changed, 97 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 5a28ae892504..e47c840fc6a8 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -44,10 +44,12 @@
>   #include <linux/module.h>
>   #include <linux/of.h>
>   #include <linux/of_address.h>
> +#include <linux/of_clk.h>
>   #include <linux/of_device.h>
>   #include <linux/of_iommu.h>
>   #include <linux/pci.h>
>   #include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
>   #include <linux/slab.h>
>   #include <linux/spinlock.h>
>  <snip>

Thanks! Tested the device tree clock portions on Intel SOCFPGA Stratix10 
DevKit.

Tested-by: Thor Thayer <thor.thayer-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

Re: [PATCH v18 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops

[Stephen Boyd]

Quoting Vivek Gautam (2018-11-27 02:11:41)
> @@ -1966,6 +1970,23 @@ 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];

Is this clk_bulk_get_all()?

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Re: [PATCH v18 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops

[Robin Murphy]

On 28/11/2018 16:24, Stephen Boyd wrote:
> Quoting Vivek Gautam (2018-11-27 02:11:41)
>> @@ -1966,6 +1970,23 @@ 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];
> 
> Is this clk_bulk_get_all()?

Ooh, did that finally get merged while we weren't looking? Great!

Much as I don't want to drag this series out to a v19, it *would* be 
neat if we no longer need to open-code that bit...

Robin.
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Re: [PATCH v18 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops

[Vivek Gautam]

On Wed, Nov 28, 2018 at 10:07 PM Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org> wrote:
>
> On 28/11/2018 16:24, Stephen Boyd wrote:
> > Quoting Vivek Gautam (2018-11-27 02:11:41)
> >> @@ -1966,6 +1970,23 @@ 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];
> >
> > Is this clk_bulk_get_all()?

>From what I remember, and now I could go back to v7 and check [1], we parked
clk_bulk_get out of OF's sole purview as we also have
arm_smmu_device_acpi_probe() besides arm_smmu_device_dt_probe().

arm_smmu_device_dt_probe() could get the clocks from dt and fill in
the clock bulk data, and
similarly, arm_smmu_device_acpi_probe() could fill the clock bulk data
by getting it from ACPI.

clk_bulk_get_all() seems like going only the OF way.
Is there another way here to have something common between ACPI
and OF, and then do the clk_bulk_get?

[1] https://lore.kernel.org/patchwork/patch/881365/

Thanks & regards
Vivek

>
> Ooh, did that finally get merged while we weren't looking? Great!
>
> Much as I don't want to drag this series out to a v19, it *would* be
> neat if we no longer need to open-code that bit...
>
> Robin.
> _______________________________________________
> iommu mailing list
> iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
> https://lists.linuxfoundation.org/mailman/listinfo/iommu



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Re: [PATCH v18 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops

[Will Deacon]

On Thu, Nov 29, 2018 at 08:25:20PM +0530, Vivek Gautam wrote:
> On Wed, Nov 28, 2018 at 10:07 PM Robin Murphy <robin.murphy@arm.com> wrote:
> >
> > On 28/11/2018 16:24, Stephen Boyd wrote:
> > > Quoting Vivek Gautam (2018-11-27 02:11:41)
> > >> @@ -1966,6 +1970,23 @@ 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];
> > >
> > > Is this clk_bulk_get_all()?
> 
> From what I remember, and now I could go back to v7 and check [1], we parked
> clk_bulk_get out of OF's sole purview as we also have
> arm_smmu_device_acpi_probe() besides arm_smmu_device_dt_probe().
> 
> arm_smmu_device_dt_probe() could get the clocks from dt and fill in
> the clock bulk data, and
> similarly, arm_smmu_device_acpi_probe() could fill the clock bulk data
> by getting it from ACPI.
> 
> clk_bulk_get_all() seems like going only the OF way.
> Is there another way here to have something common between ACPI
> and OF, and then do the clk_bulk_get?

I'd say just go with clk_bulk_get_all() and if somebody really wants to
mess with the SMMU clocks on a system booted via ACPI, then it's their
problem to solve. My understanding is that the design of IORT makes this
next to impossible to solve anyway, because a static table is used and
therefore we're unable to run whatever ASL methods need to be invoked to
mess with the clocks.

Will
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Re: [PATCH v18 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops

[Vivek Gautam]

On Fri, Nov 30, 2018 at 11:45 PM Will Deacon <will.deacon@arm.com> wrote:
>
> On Thu, Nov 29, 2018 at 08:25:20PM +0530, Vivek Gautam wrote:
> > On Wed, Nov 28, 2018 at 10:07 PM Robin Murphy <robin.murphy@arm.com> wrote:
> > >
> > > On 28/11/2018 16:24, Stephen Boyd wrote:
> > > > Quoting Vivek Gautam (2018-11-27 02:11:41)
> > > >> @@ -1966,6 +1970,23 @@ 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];
> > > >
> > > > Is this clk_bulk_get_all()?
> >
> > From what I remember, and now I could go back to v7 and check [1], we parked
> > clk_bulk_get out of OF's sole purview as we also have
> > arm_smmu_device_acpi_probe() besides arm_smmu_device_dt_probe().
> >
> > arm_smmu_device_dt_probe() could get the clocks from dt and fill in
> > the clock bulk data, and
> > similarly, arm_smmu_device_acpi_probe() could fill the clock bulk data
> > by getting it from ACPI.
> >
> > clk_bulk_get_all() seems like going only the OF way.
> > Is there another way here to have something common between ACPI
> > and OF, and then do the clk_bulk_get?
>
> I'd say just go with clk_bulk_get_all() and if somebody really wants to
> mess with the SMMU clocks on a system booted via ACPI, then it's their
> problem to solve. My understanding is that the design of IORT makes this
> next to impossible to solve anyway, because a static table is used and
> therefore we're unable to run whatever ASL methods need to be invoked to
> mess with the clocks.

Sure then. I will respin this patch-series.

>
> Will



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Re: [PATCH v18 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops

[Stephen Boyd]

Quoting Vivek Gautam (2018-12-02 22:43:38)
> On Fri, Nov 30, 2018 at 11:45 PM Will Deacon <will.deacon@arm.com> wrote:
> >
> > On Thu, Nov 29, 2018 at 08:25:20PM +0530, Vivek Gautam wrote:
> > > clk_bulk_get_all() seems like going only the OF way.
> > > Is there another way here to have something common between ACPI
> > > and OF, and then do the clk_bulk_get?
> >
> > I'd say just go with clk_bulk_get_all() and if somebody really wants to
> > mess with the SMMU clocks on a system booted via ACPI, then it's their
> > problem to solve. My understanding is that the design of IORT makes this
> > next to impossible to solve anyway, because a static table is used and
> > therefore we're unable to run whatever ASL methods need to be invoked to
> > mess with the clocks.
> 
> Sure then. I will respin this patch-series.
> 

Right. The idea is to add non-OF support to clk_bulk_get_all() if/when
we get the requirement. Sounds like we can keep waiting a little longer
for that to happen.

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[PATCH v18 2/5] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device

[Vivek Gautam]

From: Sricharan R <sricharan@codeaurora.org>

The smmu device probe/remove and add/remove master device callbacks
gets called when the smmu is not linked to its master, that is without
the context of the master device. So calling runtime apis in those places
separately.
Global locks are also initialized before enabling runtime pm as the
runtime_resume() calls device_reset() which does tlb_sync_global()
that ultimately requires locks to be initialized.

Signed-off-by: Sricharan R <sricharan@codeaurora.org>
[vivek: Cleanup pm runtime calls]
Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
---
 drivers/iommu/arm-smmu.c | 108 ++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 98 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index e47c840fc6a8..5610cc736f9d 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -271,6 +271,20 @@ static struct arm_smmu_option_prop arm_smmu_options[] = {
 	{ 0, NULL},
 };
 
+static inline int arm_smmu_rpm_get(struct arm_smmu_device *smmu)
+{
+	if (pm_runtime_enabled(smmu->dev))
+		return pm_runtime_get_sync(smmu->dev);
+
+	return 0;
+}
+
+static inline void arm_smmu_rpm_put(struct arm_smmu_device *smmu)
+{
+	if (pm_runtime_enabled(smmu->dev))
+		pm_runtime_put(smmu->dev);
+}
+
 static struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
 {
 	return container_of(dom, struct arm_smmu_domain, domain);
@@ -930,11 +944,15 @@ static void arm_smmu_destroy_domain_context(struct iommu_domain *domain)
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 	struct arm_smmu_device *smmu = smmu_domain->smmu;
 	struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
-	int irq;
+	int ret, irq;
 
 	if (!smmu || domain->type == IOMMU_DOMAIN_IDENTITY)
 		return;
 
+	ret = arm_smmu_rpm_get(smmu);
+	if (ret < 0)
+		return;
+
 	/*
 	 * Disable the context bank and free the page tables before freeing
 	 * it.
@@ -949,6 +967,8 @@ static void arm_smmu_destroy_domain_context(struct iommu_domain *domain)
 
 	free_io_pgtable_ops(smmu_domain->pgtbl_ops);
 	__arm_smmu_free_bitmap(smmu->context_map, cfg->cbndx);
+
+	arm_smmu_rpm_put(smmu);
 }
 
 static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
@@ -1230,10 +1250,15 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 		return -ENODEV;
 
 	smmu = fwspec_smmu(fwspec);
+
+	ret = arm_smmu_rpm_get(smmu);
+	if (ret < 0)
+		return ret;
+
 	/* Ensure that the domain is finalised */
 	ret = arm_smmu_init_domain_context(domain, smmu);
 	if (ret < 0)
-		return ret;
+		goto rpm_put;
 
 	/*
 	 * Sanity check the domain. We don't support domains across
@@ -1243,49 +1268,74 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 		dev_err(dev,
 			"cannot attach to SMMU %s whilst already attached to domain on SMMU %s\n",
 			dev_name(smmu_domain->smmu->dev), dev_name(smmu->dev));
-		return -EINVAL;
+		ret = -EINVAL;
+		goto rpm_put;
 	}
 
 	/* Looks ok, so add the device to the domain */
-	return arm_smmu_domain_add_master(smmu_domain, fwspec);
+	ret = arm_smmu_domain_add_master(smmu_domain, fwspec);
+
+rpm_put:
+	arm_smmu_rpm_put(smmu);
+	return ret;
 }
 
 static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
 			phys_addr_t paddr, size_t size, int prot)
 {
 	struct io_pgtable_ops *ops = to_smmu_domain(domain)->pgtbl_ops;
+	struct arm_smmu_device *smmu = to_smmu_domain(domain)->smmu;
+	int ret;
 
 	if (!ops)
 		return -ENODEV;
 
-	return ops->map(ops, iova, paddr, size, prot);
+	arm_smmu_rpm_get(smmu);
+	ret = ops->map(ops, iova, paddr, size, prot);
+	arm_smmu_rpm_put(smmu);
+
+	return ret;
 }
 
 static size_t arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
 			     size_t size)
 {
 	struct io_pgtable_ops *ops = to_smmu_domain(domain)->pgtbl_ops;
+	struct arm_smmu_device *smmu = to_smmu_domain(domain)->smmu;
+	size_t ret;
 
 	if (!ops)
 		return 0;
 
-	return ops->unmap(ops, iova, size);
+	arm_smmu_rpm_get(smmu);
+	ret = ops->unmap(ops, iova, size);
+	arm_smmu_rpm_put(smmu);
+
+	return ret;
 }
 
 static void arm_smmu_flush_iotlb_all(struct iommu_domain *domain)
 {
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+	struct arm_smmu_device *smmu = smmu_domain->smmu;
 
-	if (smmu_domain->tlb_ops)
+	if (smmu_domain->tlb_ops) {
+		arm_smmu_rpm_get(smmu);
 		smmu_domain->tlb_ops->tlb_flush_all(smmu_domain);
+		arm_smmu_rpm_put(smmu);
+	}
 }
 
 static void arm_smmu_iotlb_sync(struct iommu_domain *domain)
 {
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+	struct arm_smmu_device *smmu = smmu_domain->smmu;
 
-	if (smmu_domain->tlb_ops)
+	if (smmu_domain->tlb_ops) {
+		arm_smmu_rpm_get(smmu);
 		smmu_domain->tlb_ops->tlb_sync(smmu_domain);
+		arm_smmu_rpm_put(smmu);
+	}
 }
 
 static phys_addr_t arm_smmu_iova_to_phys_hard(struct iommu_domain *domain,
@@ -1300,6 +1350,11 @@ static phys_addr_t arm_smmu_iova_to_phys_hard(struct iommu_domain *domain,
 	u32 tmp;
 	u64 phys;
 	unsigned long va, flags;
+	int ret;
+
+	ret = arm_smmu_rpm_get(smmu);
+	if (ret < 0)
+		return 0;
 
 	cb_base = ARM_SMMU_CB(smmu, cfg->cbndx);
 
@@ -1328,6 +1383,8 @@ static phys_addr_t arm_smmu_iova_to_phys_hard(struct iommu_domain *domain,
 		return 0;
 	}
 
+	arm_smmu_rpm_put(smmu);
+
 	return (phys & GENMASK_ULL(39, 12)) | (iova & 0xfff);
 }
 
@@ -1432,7 +1489,13 @@ static int arm_smmu_add_device(struct device *dev)
 	while (i--)
 		cfg->smendx[i] = INVALID_SMENDX;
 
+	ret = arm_smmu_rpm_get(smmu);
+	if (ret < 0)
+		goto out_cfg_free;
+
 	ret = arm_smmu_master_alloc_smes(dev);
+	arm_smmu_rpm_put(smmu);
+
 	if (ret)
 		goto out_cfg_free;
 
@@ -1452,7 +1515,7 @@ static void arm_smmu_remove_device(struct device *dev)
 	struct iommu_fwspec *fwspec = dev->iommu_fwspec;
 	struct arm_smmu_master_cfg *cfg;
 	struct arm_smmu_device *smmu;
-
+	int ret;
 
 	if (!fwspec || fwspec->ops != &arm_smmu_ops)
 		return;
@@ -1460,8 +1523,15 @@ static void arm_smmu_remove_device(struct device *dev)
 	cfg  = fwspec->iommu_priv;
 	smmu = cfg->smmu;
 
+	ret = arm_smmu_rpm_get(smmu);
+	if (ret < 0)
+		return;
+
 	iommu_device_unlink(&smmu->iommu, dev);
 	arm_smmu_master_free_smes(fwspec);
+
+	arm_smmu_rpm_put(smmu);
+
 	iommu_group_remove_device(dev);
 	kfree(fwspec->iommu_priv);
 	iommu_fwspec_free(dev);
@@ -2255,6 +2325,17 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	arm_smmu_device_reset(smmu);
 	arm_smmu_test_smr_masks(smmu);
 
+	/*
+	 * We want to avoid touching dev->power.lock in fastpaths unless
+	 * it's really going to do something useful - pm_runtime_enabled()
+	 * can serve as an ideal proxy for that decision. So, conditionally
+	 * enable pm_runtime.
+	 */
+	if (dev->pm_domain) {
+		pm_runtime_set_active(dev);
+		pm_runtime_enable(dev);
+	}
+
 	/*
 	 * For ACPI and generic DT bindings, an SMMU will be probed before
 	 * any device which might need it, so we want the bus ops in place
@@ -2290,10 +2371,17 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
 	if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS))
 		dev_err(&pdev->dev, "removing device with active domains!\n");
 
+	arm_smmu_rpm_get(smmu);
 	/* Turn the thing off */
 	writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
+	arm_smmu_rpm_put(smmu);
+
+	if (pm_runtime_enabled(smmu->dev))
+		pm_runtime_force_suspend(smmu->dev);
+	else
+		clk_bulk_disable(smmu->num_clks, smmu->clks);
 
-	clk_bulk_disable_unprepare(smmu->num_clks, smmu->clks);
+	clk_bulk_unprepare(smmu->num_clks, smmu->clks);
 
 	return 0;
 }
-- 
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of Code Aurora Forum, hosted by The Linux Foundation

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[PATCH v18 3/5] iommu/arm-smmu: Add the device_link between masters and smmu

[Vivek Gautam]

From: Sricharan R <sricharan@codeaurora.org>

Finally add the device link between the master device and
smmu, so that the smmu gets runtime enabled/disabled only when the
master needs it. This is done from add_device callback which gets
called once when the master is added to the smmu.

Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
---
 drivers/iommu/arm-smmu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 5610cc736f9d..f02e0f58e696 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1501,6 +1501,9 @@ static int arm_smmu_add_device(struct device *dev)
 
 	iommu_device_link(&smmu->iommu, dev);
 
+	device_link_add(dev, smmu->dev,
+			DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER);
+
 	return 0;
 
 out_cfg_free:
-- 
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of Code Aurora Forum, hosted by The Linux Foundation

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[PATCH v18 4/5] dt-bindings: arm-smmu: Add bindings for qcom, smmu-v2

[Vivek Gautam]

Add bindings doc for Qcom's smmu-v2 implementation.

Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
---
 .../devicetree/bindings/iommu/arm,smmu.txt         | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
index 8a6ffce12af5..a6504b37cc21 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
@@ -17,10 +17,16 @@ conditions.
                         "arm,mmu-401"
                         "arm,mmu-500"
                         "cavium,smmu-v2"
+                        "qcom,smmu-v2"
 
                   depending on the particular implementation and/or the
                   version of the architecture implemented.
 
+                  Qcom SoCs must contain, as below, SoC-specific compatibles
+                  along with "qcom,smmu-v2":
+                  "qcom,msm8996-smmu-v2", "qcom,smmu-v2",
+                  "qcom,sdm845-smmu-v2", "qcom,smmu-v2".
+
 - reg           : Base address and size of the SMMU.
 
 - #global-interrupts : The number of global interrupts exposed by the
@@ -71,6 +77,22 @@ conditions.
                   or using stream matching with #iommu-cells = <2>, and
                   may be ignored if present in such cases.
 
+- clock-names:    List of the names of clocks input to the device. The
+                  required list depends on particular implementation and
+                  is as follows:
+                  - for "qcom,smmu-v2":
+                    - "bus": clock required for downstream bus access and
+                             for the smmu ptw,
+                    - "iface": clock required to access smmu's registers
+                               through the TCU's programming interface.
+                  - unspecified for other implementations.
+
+- clocks:         Specifiers for all clocks listed in the clock-names property,
+                  as per generic clock bindings.
+
+- power-domains:  Specifiers for power domains required to be powered on for
+                  the SMMU to operate, as per generic power domain bindings.
+
 ** Deprecated properties:
 
 - mmu-masters (deprecated in favour of the generic "iommus" binding) :
@@ -137,3 +159,20 @@ conditions.
                 iommu-map = <0 &smmu3 0 0x400>;
                 ...
         };
+
+	/* Qcom's arm,smmu-v2 implementation */
+	smmu4: iommu@d00000 {
+		compatible = "qcom,msm8996-smmu-v2", "qcom,smmu-v2";
+		reg = <0xd00000 0x10000>;
+
+		#global-interrupts = <1>;
+		interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 320 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 321 IRQ_TYPE_LEVEL_HIGH>;
+		#iommu-cells = <1>;
+		power-domains = <&mmcc MDSS_GDSC>;
+
+		clocks = <&mmcc SMMU_MDP_AXI_CLK>,
+			 <&mmcc SMMU_MDP_AHB_CLK>;
+		clock-names = "bus", "iface";
+	};
-- 
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[PATCH v18 5/5] iommu/arm-smmu: Add support for qcom,smmu-v2 variant

[Vivek Gautam]

qcom,smmu-v2 is an arm,smmu-v2 implementation with specific
clock and power requirements.
On msm8996, multiple cores, viz. mdss, video, etc. use this
smmu. On sdm845, this smmu is used with gpu.
Add bindings for the same.

Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
---
 drivers/iommu/arm-smmu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index f02e0f58e696..29ce9e10abd4 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -121,6 +121,7 @@ enum arm_smmu_implementation {
 	GENERIC_SMMU,
 	ARM_MMU500,
 	CAVIUM_SMMUV2,
+	QCOM_SMMUV2,
 };
 
 struct arm_smmu_s2cr {
@@ -2031,6 +2032,7 @@ ARM_SMMU_MATCH_DATA(smmu_generic_v2, ARM_SMMU_V2, GENERIC_SMMU);
 ARM_SMMU_MATCH_DATA(arm_mmu401, ARM_SMMU_V1_64K, GENERIC_SMMU);
 ARM_SMMU_MATCH_DATA(arm_mmu500, ARM_SMMU_V2, ARM_MMU500);
 ARM_SMMU_MATCH_DATA(cavium_smmuv2, ARM_SMMU_V2, CAVIUM_SMMUV2);
+ARM_SMMU_MATCH_DATA(qcom_smmuv2, ARM_SMMU_V2, QCOM_SMMUV2);
 
 static const struct of_device_id arm_smmu_of_match[] = {
 	{ .compatible = "arm,smmu-v1", .data = &smmu_generic_v1 },
@@ -2039,6 +2041,7 @@ static const struct of_device_id arm_smmu_of_match[] = {
 	{ .compatible = "arm,mmu-401", .data = &arm_mmu401 },
 	{ .compatible = "arm,mmu-500", .data = &arm_mmu500 },
 	{ .compatible = "cavium,smmu-v2", .data = &cavium_smmuv2 },
+	{ .compatible = "qcom,smmu-v2", .data = &qcom_smmuv2 },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
-- 
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of Code Aurora Forum, hosted by The Linux Foundation