> -----Original Message----- > From: Robin Murphy [mailto:robin.murphy@xxxxxxx] > Sent: Tuesday, May 16, 2017 2:13 PM > To: Shameerali Kolothum Thodi; will.deacon@xxxxxxx; > mark.rutland@xxxxxxx; lorenzo.pieralisi@xxxxxxx; hanjun.guo@xxxxxxxxxx > Cc: devicetree@xxxxxxxxxxxxxxx; Gabriele Paoloni; John Garry; Linuxarm; > linux-acpi@xxxxxxxxxxxxxxx; iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx; Wangzhou > (B); Guohanjun (Hanjun Guo); linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; > devel@xxxxxxxxxx > Subject: Re: [RFC v1 4/7] iommu/arm-smmu-v3: Enable HiSilicon erratum > 161010701 > > 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? This was the side effect of the "framework". Sure will update on next revision. Thanks, Shameer > 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)) > > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
