On 13/05/17 10:47, shameer wrote:
> This replaces the existing broken_prefetch_cmd quirk using
> the new erratum framework.
>
> Signed-off-by: shameer <shameerali.kolothum.thodi@xxxxxxxxxx>
> ---
> arch/arm64/Kconfig | 10 +++++++++-
> drivers/iommu/arm-smmu-v3.c | 36 ++++++++++--------------------------
> 2 files changed, 19 insertions(+), 27 deletions(-)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index a39029b..21d61ff 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -508,8 +508,16 @@ config QCOM_FALKOR_ERRATUM_1009
>
> If unsure, say Y.
>
> -endmenu
> +config HISILICON_ERRATUM_161010701
> + bool "HiSilicon erratum 161010701: Skip SMMU Prefetch Cmd"
> + default y
> + help
> + On HiSilicon Hip06/Hip07 platforms, the SMMU v3 doesn't support the
> + CMD_PREFETCH_CFG. This will skip the prefetch cmd usage.
>
> + If unsure, say Y.
We don't need a config. This feature (not to mention others like it) is
runtime-detected, and has effectively zero execution overhead and
negligible Image-size overhead either way; why would anyone ever turn it
off?
Robin.
> +
> +endmenu
>
> choice
> prompt "Page size"
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index f20d5d5..14538cb 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -650,16 +650,6 @@ struct arm_smmu_domain {
> struct iommu_domain domain;
> };
>
> -struct arm_smmu_option_prop {
> - u32 opt;
> - const char *prop;
> -};
> -
> -static struct arm_smmu_option_prop arm_smmu_options[] = {
> - { ARM_SMMU_OPT_SKIP_PREFETCH, "hisilicon,broken-prefetch-cmd" },
> - { 0, NULL},
> -};
> -
> enum smmu_erratum_match_type {
> se_match_dt,
> };
> @@ -677,7 +667,17 @@ struct smmu_erratum_workaround {
> };
>
> static const struct smmu_erratum_workaround smmu_workarounds[] = {
> +#ifdef CONFIG_HISILICON_ERRATUM_161010701
> + {
> + .match_type = se_match_dt,
> + .id = "hisilicon,erratum-161010701",
> + .desc_str = "HiSilicon erratum 161010701",
> + .enable = erratum_skip_prefetch_cmd,
> + },
> +#endif
> + {
>
> + },
> };
>
> typedef bool (*se_match_fn_t)(const struct smmu_erratum_workaround *,
> @@ -735,20 +735,6 @@ static struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
> return container_of(dom, struct arm_smmu_domain, domain);
> }
>
> -static void parse_driver_options(struct arm_smmu_device *smmu)
> -{
> - int i = 0;
> -
> - do {
> - if (of_property_read_bool(smmu->dev->of_node,
> - arm_smmu_options[i].prop)) {
> - smmu->options |= arm_smmu_options[i].opt;
> - dev_notice(smmu->dev, "option %s\n",
> - arm_smmu_options[i].prop);
> - }
> - } while (arm_smmu_options[++i].opt);
> -}
> -
> /* Low-level queue manipulation functions */
> static bool queue_full(struct arm_smmu_queue *q)
> {
> @@ -2695,8 +2681,6 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev,
> else
> ret = 0;
>
> - parse_driver_options(smmu);
> -
> smmu_check_workarounds(smmu, se_match_dt, dev->of_node);
>
> if (of_dma_is_coherent(dev->of_node))
>
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