Hi Will/Robin, > -----Original Message----- > From: Shameerali Kolothum Thodi > Sent: Wednesday, May 17, 2017 10:12 AM > To: robin.murphy@xxxxxxx; will.deacon@xxxxxxx; > mark.rutland@xxxxxxx; lorenzo.pieralisi@xxxxxxx > Cc: John Garry; Gabriele Paoloni; Guohanjun (Hanjun Guo); xuwei (O); > Linuxarm; devel@xxxxxxxxxx; linux-acpi@xxxxxxxxxxxxxxx; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; Shameerali > Kolothum Thodi > Subject: [PATCH] iommu/arm-smmu-v3: Enable ACPI based HiSilicon > CMD_PREFETCH quirk(erratum 161010701) > > HiSilicon SMMUv3 on Hip06/Hip07 platforms doesn't support CMD_PREFETCH > command. The dt based support for this quirk is already present in the > driver(hisilicon,broken-prefetch-cmd). This adds ACPI support for the > quirk using the IORT smmu model number. This also has dependency on acpica header update and it looks like it's going to take a while to appear on Linux mainline. I have seen patches where a temp local definition for SMMU v3 model number is suggested instead. Could you please let me know the plan so that I can base this patch similar to or on top of Caviums "[PATCH] iommu/arm-smmu-v3, acpi: Add temporary Cavium SMMU-V3 IORT model number definitions" Thanks, Shameer > Signed-off-by: shameer <shameerali.kolothum.thodi@xxxxxxxxxx> > Signed-off-by: hanjun <guohanjun@xxxxxxxxxx> > --- > Documentation/arm64/silicon-errata.txt | 1 + > drivers/iommu/arm-smmu-v3.c | 16 ++++++++++++++++ > 2 files changed, 17 insertions(+) > > diff --git a/Documentation/arm64/silicon-errata.txt > b/Documentation/arm64/silicon-errata.txt > index 10f2ddd..d5d23d0 100644 > --- a/Documentation/arm64/silicon-errata.txt > +++ b/Documentation/arm64/silicon-errata.txt > @@ -66,6 +66,7 @@ stable kernels. > | Freescale/NXP | LS2080A/LS1043A | A-008585 | > FSL_ERRATUM_A008585 | > | | | | | > | Hisilicon | Hip0{5,6,7} | #161010101 | > HISILICON_ERRATUM_161010101 | > +| Hisilicon | Hip0{6,7} | #161010701 | N/A | > | | | | | > | Qualcomm Tech. | Falkor v1 | E1003 | > QCOM_FALKOR_ERRATUM_1003 | > | Qualcomm Tech. | Falkor v1 | E1009 | > QCOM_FALKOR_ERRATUM_1009 | > diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c > index 380969a..abe4b88 100644 > --- a/drivers/iommu/arm-smmu-v3.c > +++ b/drivers/iommu/arm-smmu-v3.c > @@ -2605,6 +2605,20 @@ static int arm_smmu_device_hw_probe(struct > arm_smmu_device *smmu) > } > > #ifdef CONFIG_ACPI > +static void parse_driver_acpi_options(struct acpi_iort_smmu_v3 > *iort_smmu, > + struct arm_smmu_device *smmu) > +{ > + switch (iort_smmu->model) { > + case ACPI_IORT_SMMU_HISILICON_HI161X: > + smmu->options |= ARM_SMMU_OPT_SKIP_PREFETCH; > + break; > + default: > + break; > + } > + > + dev_notice(smmu->dev, "options set 0x%x\n", smmu->options); > +} > + > static int arm_smmu_device_acpi_probe(struct platform_device *pdev, > struct arm_smmu_device *smmu) > { > @@ -2617,6 +2631,8 @@ static int arm_smmu_device_acpi_probe(struct > platform_device *pdev, > /* Retrieve SMMUv3 specific data */ > iort_smmu = (struct acpi_iort_smmu_v3 *)node->node_data; > > + parse_driver_acpi_options(iort_smmu, smmu); > + > if (iort_smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE) > smmu->features |= ARM_SMMU_FEAT_COHERENCY; > > -- > 1.9.1 > -- 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