Re: [PATCH v7 2/6] iommu/arm-smmu: Add pm_runtime/sleep ops
Hi Tomasz,
Please find my response inline below.
On Tue, Feb 13, 2018 at 1:33 PM, Tomasz Figa wrote:
> Hi Vivek,
>
> Thanks for the patch. Please see some comments inline.
>
> On Wed, Feb 7, 2018 at 7:31 PM, 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.
>>
>> Signed-off-by: Sricharan R
>> Signed-off-by: Archit Taneja
>> [vivek: Clock rework to request bulk of clocks]
>> Signed-off-by: Vivek Gautam
>> ---
>> drivers/iommu/arm-smmu.c | 56
>> ++--
>> 1 file changed, 54 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
>> index 69e7c60792a8..9e2f917e16c2 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*clocks;
>> + int num_clks;
>
> nit: Perhaps "num_clocks" to be consistent with "clocks"?
>
>>
>> u32 cavium_id_base; /* Specific to
>> Cavium */
>>
>> @@ -1897,10 +1900,12 @@ 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;
>
> nit: Perhaps s/clks/clocks/ here or s/clocks/clks/ in struct arm_smmu_device?
Sure. Will change to s/clocks/clks/ in struct arm_smmu_device.
>
>> };
>>
>> #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);
>> @@ -2001,6 +2006,7 @@ 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;
>>
>> parse_driver_options(smmu);
>>
>> @@ -2039,6 +2045,28 @@ static void arm_smmu_bus_init(void)
>> #endif
>> }
>>
>> +static int arm_smmu_init_clks(struct arm_smmu_device *smmu)
>> +{
>> + int i;
>> + int num = smmu->num_clks;
>> + const struct arm_smmu_match_data *data;
>> +
>> + if (num < 1)
>> + return 0;
>> +
>> + smmu->clocks = devm_kcalloc(smmu->dev, num,
>> + sizeof(*smmu->clocks), GFP_KERNEL);
>> + if (!smmu->clocks)
>> + return -ENOMEM;
>> +
>> + data = of_device_get_match_data(smmu->dev);
>> +
>> + for (i = 0; i < num; i++)
>> + smmu->clocks[i].id = data->clks[i];
>
> I'd argue that arm_smmu_device_dt_probe() is a better place for all
> the code above, since this function is called regardless of whether
> the device is probed from DT or not. Going further,
> arm_smmu_device_acpi_probe() could fill smmu->num_clks and ->clocks
> using ACPI-like way (as opposed to OF match data) if necessary.
Right, it's valid to fill the data in arm_smmu_device_dt_probe().
Perhaps we can just keep the devm_clk_bulk_get() in arm_smmu_device_probe()
at the point where we are currently doing arm_smmu_init_clks().
Thanks & regards
Vivek
>
> Best regards,
> Tomasz
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Re: [PATCH v7 2/6] iommu/arm-smmu: Add pm_runtime/sleep ops
On Tue, Feb 13, 2018 at 7:25 PM, Vivek Gautam
wrote:
>>> +static int arm_smmu_init_clks(struct arm_smmu_device *smmu)
>>> +{
>>> + int i;
>>> + int num = smmu->num_clks;
>>> + const struct arm_smmu_match_data *data;
>>> +
>>> + if (num < 1)
>>> + return 0;
>>> +
>>> + smmu->clocks = devm_kcalloc(smmu->dev, num,
>>> + sizeof(*smmu->clocks), GFP_KERNEL);
>>> + if (!smmu->clocks)
>>> + return -ENOMEM;
>>> +
>>> + data = of_device_get_match_data(smmu->dev);
>>> +
>>> + for (i = 0; i < num; i++)
>>> + smmu->clocks[i].id = data->clks[i];
>>
>> I'd argue that arm_smmu_device_dt_probe() is a better place for all
>> the code above, since this function is called regardless of whether
>> the device is probed from DT or not. Going further,
>> arm_smmu_device_acpi_probe() could fill smmu->num_clks and ->clocks
>> using ACPI-like way (as opposed to OF match data) if necessary.
>
> Right, it's valid to fill the data in arm_smmu_device_dt_probe().
> Perhaps we can just keep the devm_clk_bulk_get() in arm_smmu_device_probe()
> at the point where we are currently doing arm_smmu_init_clks().
Sounds good to me. Thanks.
Best regards,
Tomasz
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Re: [PATCH v7 2/6] iommu/arm-smmu: Add pm_runtime/sleep ops
Hi Vivek,
Thanks for the patch. Please see some comments inline.
On Wed, Feb 7, 2018 at 7:31 PM, 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.
>
> Signed-off-by: Sricharan R
> Signed-off-by: Archit Taneja
> [vivek: Clock rework to request bulk of clocks]
> Signed-off-by: Vivek Gautam
> ---
> drivers/iommu/arm-smmu.c | 56
> ++--
> 1 file changed, 54 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 69e7c60792a8..9e2f917e16c2 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*clocks;
> + int num_clks;
nit: Perhaps "num_clocks" to be consistent with "clocks"?
>
> u32 cavium_id_base; /* Specific to Cavium
> */
>
> @@ -1897,10 +1900,12 @@ 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;
nit: Perhaps s/clks/clocks/ here or s/clocks/clks/ in struct arm_smmu_device?
> };
>
> #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);
> @@ -2001,6 +2006,7 @@ 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;
>
> parse_driver_options(smmu);
>
> @@ -2039,6 +2045,28 @@ static void arm_smmu_bus_init(void)
> #endif
> }
>
> +static int arm_smmu_init_clks(struct arm_smmu_device *smmu)
> +{
> + int i;
> + int num = smmu->num_clks;
> + const struct arm_smmu_match_data *data;
> +
> + if (num < 1)
> + return 0;
> +
> + smmu->clocks = devm_kcalloc(smmu->dev, num,
> + sizeof(*smmu->clocks), GFP_KERNEL);
> + if (!smmu->clocks)
> + return -ENOMEM;
> +
> + data = of_device_get_match_data(smmu->dev);
> +
> + for (i = 0; i < num; i++)
> + smmu->clocks[i].id = data->clks[i];
I'd argue that arm_smmu_device_dt_probe() is a better place for all
the code above, since this function is called regardless of whether
the device is probed from DT or not. Going further,
arm_smmu_device_acpi_probe() could fill smmu->num_clks and ->clocks
using ACPI-like way (as opposed to OF match data) if necessary.
Best regards,
Tomasz
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