| Message ID | 20171129141449.120316-1-shameerali.kolothum.thodi@huawei.com |
|---|---|
| Headers | show |
| Series | iommu/smmu-v3: Workaround for hisilicon 161010801 erratum(reserve HW MSI) | expand |
Hi Lorenzo/Robin, Any feedback on this series, please? This one has the platform check(smmu model) moved into iort code and invoking the helper fn from iommu_dma_get_resv_regions(). Thanks, Shameer > -----Original Message----- > From: Shameerali Kolothum Thodi > Sent: Wednesday, November 29, 2017 2:15 PM > To: lorenzo.pieralisi@arm.com; will.deacon@arm.com; > robin.murphy@arm.com; marc.zyngier@arm.com; joro@8bytes.org > Cc: John Garry <john.garry@huawei.com>; xuwei (O) <xuwei5@hisilicon.com>; > Guohanjun (Hanjun Guo) <guohanjun@huawei.com>; iommu@lists.linux- > foundation.org; linux-arm-kernel@lists.infradead.org; linux- > acpi@vger.kernel.org; devicetree@vger.kernel.org; Linuxarm > <linuxarm@huawei.com>; Shameerali Kolothum Thodi > <shameerali.kolothum.thodi@huawei.com> > Subject: [PATCH v10 0/3] iommu/smmu-v3: Workaround for hisilicon > 161010801 erratum(reserve HW MSI) > > On certain HiSilicon platforms (hip06/hip07) the GIC ITS and PCIe RC > deviates from the standard implementation and this breaks PCIe MSI > functionality when SMMU is enabled. > > The HiSilicon erratum 161010801 describes this limitation of certain > HiSilicon platforms to support the SMMU mappings for MSI transactions. > On these platforms GICv3 ITS translator is presented with the deviceID > by extending the MSI payload data to 64 bits to include the deviceID. > Hence, the PCIe controller on this platforms has to differentiate the MSI > payload against other DMA payload and has to modify the MSI payload. > This basically makes it difficult for this platforms to have a SMMU > translation for MSI. > > This patch implements an ACPI based quirk to reserve the hw msi regions > in the smmu-v3 driver which means these address regions will not be > translated and will be excluded from iova allocations. > > To implement this quirk, the following changes are incorporated: > 1. Added a generic helper function to IORT code to retrieve and reserve > the associated ITS base address from a device IORT node. The function > has a check for smmu model to determine whether the platform requires > the HW MSI reservation or not. > 2. Added smmu node entries and explicitly disabled them in hip06/hip07 > dts files so that users are warned about the non-DT support for this > erratum. > > Changelog: > > v9 --> v10 > Addressed comments: > -Moved smmu model check to iort helper function to selectively apply > the msi reservation which will make the fn call generic from iommu-dma. > -Removed PCI blacklisting patch, instead added smmu nodes(disabled) > with comments to hip06/hip07 dts file. > > v8 --> v9 > -Thanks to Marc, fixed IORT helper function to reserve the ITS > translater region only. > -Removed the DT support for MSI reservation and blacklisted > HiSilicon PCIe controllers on DT based systems when SMMUv3 is > enabled. > > v7 --> v8 > Addressed comments from Rob and Lorenzo: > -Modified to use DT compatible string for errata. > -Changed logic to retrieve the msi-parent for DT case. > > v6 --> v7 > Addressed request from Will to add DT support for the erratum: > - added bt binding > - add of_iommu_msi_get_resv_regions() > New arm64 silicon errata entry > Rename iort_iommu_{its->msi}_get_resv_regions > > v5 --> v6 > Addressed comments from Robin and Lorenzo: > -No change to patch#1 . > -Reverted v5 patch#2 as this might break the platforms where this quirk > is not applicable. Provided a generic function in iommu code and added > back the quirk implementation in SMMU v3 driver(patch#3) > > v4 --> v5 > Addressed comments from Robin and Lorenzo: > -Added a comment to make it clear that, for now, only straightforward > HW topologies are handled while reserving ITS regions(patch #1). > > v3 --> v4 > Rebased on 4.13-rc1. > Addressed comments from Robin, Will and Lorenzo: > -As suggested by Robin, moved the ITS msi reservation into > iommu_dma_get_resv_regions(). > -Added its_count != resv region failure case(patch #1). > > v2 --> v3 > Addressed comments from Lorenzo and Robin: > -Removed dev_is_pci() check in smmuV3 driver. > -Don't treat device not having an ITS mapping as an error in > iort helper function. > > v1 --> v2 > -patch 2/2: Invoke iort helper fn based on fwnode type(acpi). > > RFCv2 -->PATCH > -Incorporated Lorenzo's review comments. > > RFC v1 --> RFC v2 > Based on Robin's review comments, > -Removed the generic erratum framework. > -Using IORT/MADT tables to retrieve the ITS base addr instead of vendor > specific CSRT table. > > Shameer Kolothum (3): > ACPI/IORT: Add msi address regions reservation helper > iommu/dma: Add HW MSI(GICv3 ITS) address regions reservation > arm64:dts:hisilicon Disable hisilicon smmu node on hip06/hip07 > > arch/arm64/boot/dts/hisilicon/hip06.dtsi | 55 +++++++++++++ > arch/arm64/boot/dts/hisilicon/hip07.dtsi | 24 ++++++ > drivers/acpi/arm64/iort.c | 133 ++++++++++++++++++++++++++++++- > drivers/iommu/dma-iommu.c | 8 +- > drivers/irqchip/irq-gic-v3-its.c | 3 +- > include/linux/acpi_iort.h | 7 +- > 6 files changed, 224 insertions(+), 6 deletions(-) > > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On certain HiSilicon platforms (hip06/hip07) the GIC ITS and PCIe RC deviates from the standard implementation and this breaks PCIe MSI functionality when SMMU is enabled. The HiSilicon erratum 161010801 describes this limitation of certain HiSilicon platforms to support the SMMU mappings for MSI transactions. On these platforms GICv3 ITS translator is presented with the deviceID by extending the MSI payload data to 64 bits to include the deviceID. Hence, the PCIe controller on this platforms has to differentiate the MSI payload against other DMA payload and has to modify the MSI payload. This basically makes it difficult for this platforms to have a SMMU translation for MSI. This patch implements an ACPI based quirk to reserve the hw msi regions in the smmu-v3 driver which means these address regions will not be translated and will be excluded from iova allocations. To implement this quirk, the following changes are incorporated: 1. Added a generic helper function to IORT code to retrieve and reserve the associated ITS base address from a device IORT node. The function has a check for smmu model to determine whether the platform requires the HW MSI reservation or not. 2. Added smmu node entries and explicitly disabled them in hip06/hip07 dts files so that users are warned about the non-DT support for this erratum. Changelog: v9 --> v10 Addressed comments: -Moved smmu model check to iort helper function to selectively apply the msi reservation which will make the fn call generic from iommu-dma. -Removed PCI blacklisting patch, instead added smmu nodes(disabled) with comments to hip06/hip07 dts file. v8 --> v9 -Thanks to Marc, fixed IORT helper function to reserve the ITS translater region only. -Removed the DT support for MSI reservation and blacklisted HiSilicon PCIe controllers on DT based systems when SMMUv3 is enabled. v7 --> v8 Addressed comments from Rob and Lorenzo: -Modified to use DT compatible string for errata. -Changed logic to retrieve the msi-parent for DT case. v6 --> v7 Addressed request from Will to add DT support for the erratum: - added bt binding - add of_iommu_msi_get_resv_regions() New arm64 silicon errata entry Rename iort_iommu_{its->msi}_get_resv_regions v5 --> v6 Addressed comments from Robin and Lorenzo: -No change to patch#1 . -Reverted v5 patch#2 as this might break the platforms where this quirk is not applicable. Provided a generic function in iommu code and added back the quirk implementation in SMMU v3 driver(patch#3) v4 --> v5 Addressed comments from Robin and Lorenzo: -Added a comment to make it clear that, for now, only straightforward HW topologies are handled while reserving ITS regions(patch #1). v3 --> v4 Rebased on 4.13-rc1. Addressed comments from Robin, Will and Lorenzo: -As suggested by Robin, moved the ITS msi reservation into iommu_dma_get_resv_regions(). -Added its_count != resv region failure case(patch #1). v2 --> v3 Addressed comments from Lorenzo and Robin: -Removed dev_is_pci() check in smmuV3 driver. -Don't treat device not having an ITS mapping as an error in iort helper function. v1 --> v2 -patch 2/2: Invoke iort helper fn based on fwnode type(acpi). RFCv2 -->PATCH -Incorporated Lorenzo's review comments. RFC v1 --> RFC v2 Based on Robin's review comments, -Removed the generic erratum framework. -Using IORT/MADT tables to retrieve the ITS base addr instead of vendor specific CSRT table. Shameer Kolothum (3): ACPI/IORT: Add msi address regions reservation helper iommu/dma: Add HW MSI(GICv3 ITS) address regions reservation arm64:dts:hisilicon Disable hisilicon smmu node on hip06/hip07 arch/arm64/boot/dts/hisilicon/hip06.dtsi | 55 +++++++++++++ arch/arm64/boot/dts/hisilicon/hip07.dtsi | 24 ++++++ drivers/acpi/arm64/iort.c | 133 ++++++++++++++++++++++++++++++- drivers/iommu/dma-iommu.c | 8 +- drivers/irqchip/irq-gic-v3-its.c | 3 +- include/linux/acpi_iort.h | 7 +- 6 files changed, 224 insertions(+), 6 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html