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Message-ID: <6dc509ac-8f3b-40c2-bc1d-a86b76efde76@quicinc.com>
Date: Mon, 18 Dec 2023 11:06:27 +0530
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Subject: Re: [PATCH v4 3/5] iommu/arm-smmu: add ACTLR data and support for
 SM8550
To: Robin Murphy <robin.murphy@arm.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@linaro.org>
CC: <will@kernel.org>, <joro@8bytes.org>, <konrad.dybcio@linaro.org>,
        <jsnitsel@redhat.com>, <quic_bjorande@quicinc.com>, <mani@kernel.org>,
        <quic_eberman@quicinc.com>, <robdclark@chromium.org>,
        <u.kleine-koenig@pengutronix.de>, <robh@kernel.org>,
        <vladimir.oltean@nxp.com>, <quic_pkondeti@quicinc.com>,
        <quic_molvera@quicinc.com>, <linux-arm-msm@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <iommu@lists.linux.dev>,
        <linux-kernel@vger.kernel.org>, <qipl.kernel.upstream@quicinc.com>
References: <20231215101827.30549-1-quic_bibekkum@quicinc.com>
 <20231215101827.30549-4-quic_bibekkum@quicinc.com>
 <CAA8EJppcsr1sbeD1fK0nZ+rASABNcetBK3yMvaP7OiA4JPwskw@mail.gmail.com>
 <c9493c5f-ccf8-4e21-b00c-5fbc2a5f2edb@quicinc.com>
 <b7f2bbf9-fb5a-430d-aa32-3a220b46c2f0@arm.com>
Content-Language: en-US
From: Bibek Kumar Patro <quic_bibekkum@quicinc.com>
In-Reply-To: <b7f2bbf9-fb5a-430d-aa32-3a220b46c2f0@arm.com>
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On 12/15/2023 6:24 PM, Robin Murphy wrote:
> On 2023-12-15 12:20 pm, Bibek Kumar Patro wrote:
>>
>>
>> On 12/15/2023 4:14 PM, Dmitry Baryshkov wrote:
>>> On Fri, 15 Dec 2023 at 12:19, Bibek Kumar Patro
>>> <quic_bibekkum@quicinc.com> wrote:
>>>>
>>>> Add ACTLR data table for SM8550 along with support for
>>>> same including SM8550 specific implementation operations.
>>>>
>>>> Signed-off-by: Bibek Kumar Patro <quic_bibekkum@quicinc.com>
>>>> ---
>>>>   drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 89 
>>>> ++++++++++++++++++++++
>>>>   1 file changed, 89 insertions(+)
>>>>
>>>> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c 
>>>> b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
>>>> index cb49291f5233..d2006f610243 100644
>>>> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
>>>> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
>>>> @@ -20,6 +20,85 @@ struct actlr_config {
>>>>          u32 actlr;
>>>>   };
>>>>
>>>> +/*
>>>> + * SMMU-500 TRM defines BIT(0) as CMTLB (Enable context caching in the
>>>> + * macro TLB) and BIT(1) as CPRE (Enable context caching in the 
>>>> prefetch
>>>> + * buffer). The remaining bits are implementation defined and vary 
>>>> across
>>>> + * SoCs.
>>>> + */
>>>> +
>>>> +#define PREFETCH_DEFAULT       0
>>>> +#define PREFETCH_SHALLOW       BIT(8)
>>>> +#define PREFETCH_MODERATE      BIT(9)
>>>> +#define PREFETCH_DEEP          (BIT(9) | BIT(8))
>>>
>>> I thin the following might be more correct:
>>>
>>> #include <linux/bitfield.h>
>>>
>>> #define PREFETCH_MASK GENMASK(9, 8)
>>> #define PREFETCH_DEFAULT FIELD_PREP(PREFETCH_MASK, 0)
>>> #define PREFETCH_SHALLOW FIELD_PREP(PREFETCH_MASK, 1)
>>> #define PREFETCH_MODERATE FIELD_PREP(PREFETCH_MASK, 2)
>>> #define PREFETCH_DEEP FIELD_PREP(PREFETCH_MASK, 3)
>>>
>>
>> Ack, thanks for this suggestion. Let me try this out using
>> GENMASK. Once tested, will take care of this in next version.
> 
> FWIW the more typical usage would be to just define the named macros for 
> the raw field values, then put the FIELD_PREP() at the point of use. 
> However in this case that's liable to get pretty verbose, so although 
> I'm usually a fan of bitfield.h, the most readable option here might 
> actually be to stick with simpler definitions of "(0 << 8)", "(1 << 8)", 
> etc. However it's not really a big deal either way, and I defer to 
> whatever Dmitry and Konrad prefer, since they're the ones looking after 
> arm-smmu-qcom the most :)
> 

Agree, surely simple macros would be easy to understand the bits we are
setting/resetting, but to get good verbosity bitfield would surely be
helpful as you rightly pointed. I can see some improved suggestions form
Konrad as well in the latest reply, the way it'd be better in arm-smmu-
qcom. Will try to incorporate these inputs in next version.

Thanks,
Bibek

> Thanks,
> Robin.
> 
>>
>> Thanks,
>> Bibek
>>
>>>> +#define PREFETCH_SWITCH_GFX    (BIT(5) | BIT(3))
>>>> +#define CPRE                   BIT(1)
>>>> +#define CMTLB                  BIT(0)
>>>> +
>>>> +static const struct actlr_config sm8550_apps_actlr_cfg[] = {
>>>> +       { 0x18a0, 0x0000, PREFETCH_SHALLOW | CPRE | CMTLB },
>>>> +       { 0x18e0, 0x0000, PREFETCH_SHALLOW | CPRE | CMTLB },
>>>> +       { 0x0800, 0x0020, PREFETCH_DEFAULT | CMTLB },
>>>> +       { 0x1800, 0x00c0, PREFETCH_DEFAULT | CMTLB },
>>>> +       { 0x1820, 0x0000, PREFETCH_DEFAULT | CMTLB },
>>>> +       { 0x1860, 0x0000, PREFETCH_DEFAULT | CMTLB },
>>>> +       { 0x0c01, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c02, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c03, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c04, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c05, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c06, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c07, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c08, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c09, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c0c, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c0d, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c0e, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x0c0f, 0x0020, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x1961, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x1962, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x1963, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x1964, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x1965, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x1966, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x1967, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x1968, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x1969, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x196c, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x196d, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x196e, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x196f, 0x0000, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19c1, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19c2, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19c3, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19c4, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19c5, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19c6, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19c7, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19c8, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19c9, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19cc, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19cd, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19ce, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x19cf, 0x0010, PREFETCH_DEEP | CPRE | CMTLB },
>>>> +       { 0x1c00, 0x0002, PREFETCH_SHALLOW | CPRE | CMTLB },
>>>> +       { 0x1c01, 0x0000, PREFETCH_DEFAULT | CMTLB },
>>>> +       { 0x1920, 0x0000, PREFETCH_SHALLOW | CPRE | CMTLB },
>>>> +       { 0x1923, 0x0000, PREFETCH_SHALLOW | CPRE | CMTLB },
>>>> +       { 0x1924, 0x0000, PREFETCH_SHALLOW | CPRE | CMTLB },
>>>> +       { 0x1940, 0x0000, PREFETCH_SHALLOW | CPRE | CMTLB },
>>>> +       { 0x1941, 0x0004, PREFETCH_SHALLOW | CPRE | CMTLB },
>>>> +       { 0x1943, 0x0000, PREFETCH_SHALLOW | CPRE | CMTLB },
>>>> +       { 0x1944, 0x0000, PREFETCH_SHALLOW | CPRE | CMTLB },
>>>> +       { 0x1947, 0x0000, PREFETCH_SHALLOW | CPRE | CMTLB },
>>>> +       {},
>>>> +};
>>>> +
>>>> +static const struct actlr_config sm8550_gfx_actlr_cfg[] = {
>>>> +       { 0x0000, 0x03ff, PREFETCH_SWITCH_GFX | PREFETCH_DEEP | CPRE 
>>>> | CMTLB },
>>>> +       {},
>>>> +};
>>>> +
>>>>   static struct qcom_smmu *to_qcom_smmu(struct arm_smmu_device *smmu)
>>>>   {
>>>>          return container_of(smmu, struct qcom_smmu, smmu);
>>>> @@ -549,6 +628,15 @@ static const struct qcom_smmu_match_data 
>>>> sdm845_smmu_500_data = {
>>>>          /* Also no debug configuration. */
>>>>   };
>>>>
>>>> +
>>>> +static const struct qcom_smmu_match_data sm8550_smmu_500_impl0_data 
>>>> = {
>>>> +       .impl = &qcom_smmu_500_impl,
>>>> +       .adreno_impl = &qcom_adreno_smmu_500_impl,
>>>> +       .cfg = &qcom_smmu_impl0_cfg,
>>>> +       .actlrcfg = sm8550_apps_actlr_cfg,
>>>> +       .actlrcfg_gfx = sm8550_gfx_actlr_cfg,
>>>> +};
>>>> +
>>>>   static const struct qcom_smmu_match_data qcom_smmu_500_impl0_data = {
>>>>          .impl = &qcom_smmu_500_impl,
>>>>          .adreno_impl = &qcom_adreno_smmu_500_impl,
>>>> @@ -583,6 +671,7 @@ static const struct of_device_id __maybe_unused 
>>>> qcom_smmu_impl_of_match[] = {
>>>>          { .compatible = "qcom,sm8250-smmu-500", .data = 
>>>> &qcom_smmu_500_impl0_data },
>>>>          { .compatible = "qcom,sm8350-smmu-500", .data = 
>>>> &qcom_smmu_500_impl0_data },
>>>>          { .compatible = "qcom,sm8450-smmu-500", .data = 
>>>> &qcom_smmu_500_impl0_data },
>>>> +       { .compatible = "qcom,sm8550-smmu-500", .data = 
>>>> &sm8550_smmu_500_impl0_data },
>>>>          { .compatible = "qcom,smmu-500", .data = 
>>>> &qcom_smmu_500_impl0_data },
>>>>          { }
>>>>   };
>>>> -- 
>>>> 2.17.1
>>>>
>>>
>>>