This is my second attempt to make Marvell 88SE91xx SATA controllers work when IOMMU is enabled.[1][2] As suggested, it no longer tries to add support for phantom functions.
What's missing: * No AMD support. I need some help with this. * Table of affected chip IDs is incomplete. I think 0x9123, 0x9125, 0x9128 are also affected. Patch is against 3.7.1 Review and feedback would be appreciated. 1. https://bugzilla.redhat.com/show_bug.cgi?id=757166 2. https://bugzilla.kernel.org/show_bug.cgi?id=42679 Signed-off-by: Andrew Cooks <aco...@gmail.com> --- drivers/iommu/intel-iommu.c | 36 ++++++++++++++++++++++++++++++++++-- drivers/pci/quirks.c | 34 ++++++++++++++++++++++++++++++++++ include/linux/pci.h | 1 + 3 files changed, 66 insertions(+), 0 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 0badfa4..17e64c0 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1672,6 +1674,31 @@ static int domain_context_mapping_one(struct dmar_domain *domain, int segment, return 0; } +/* For buggy devices like Marvell 88SE91xx chips that use unclaimed + * functions. + */ +static int map_quirky_dma_fn(struct dmar_domain *domain, + struct pci_dev *pdev, + int translation) +{ + u8 fn; + int err = 0; + + for (fn = 1; fn < 8; fn++) { + if (pci_func_is_dma_source(pdev, fn)) { + err = domain_context_mapping_one(domain, + pci_domain_nr(pdev->bus), + pdev->bus->number, + PCI_DEVFN(PCI_SLOT(pdev->devfn), fn), + translation); + if (err) + return err; + dev_dbg(&pdev->dev, "func: %d mapped dma quirk", fn); + } + } + return 0; +} + static int domain_context_mapping(struct dmar_domain *domain, struct pci_dev *pdev, int translation) @@ -1685,6 +1712,11 @@ domain_context_mapping(struct dmar_domain *domain, struct pci_dev *pdev, if (ret) return ret; + /* quirk for undeclared pci functions */ + ret = map_quirky_dma_fn(domain, pdev, translation); + if (ret) + return ret; + /* dependent device mapping */ tmp = pci_find_upstream_pcie_bridge(pdev); if (!tmp) diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 7a451ff..8d02bac 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -3227,6 +3227,40 @@ static const struct pci_dev_dma_source { { 0 } }; +static const struct pci_dev_dma_source_funcs { + u16 vendor; + u16 device; + u8 func_map; /* bit map. lsb is fn 0. */ +} pci_dev_dma_source_funcs[] = { + {0x1b4b, 0x9172, (1<<0)|(1<<1)}, + { 0 }, +}; + +static u8 pci_get_dma_source_map(struct pci_dev *dev) +{ + const struct pci_dev_dma_source_funcs *i; + + for (i = pci_dev_dma_source_funcs; i->func_map; i++) { + if ((i->vendor == dev->vendor || + i->vendor == (u16)PCI_ANY_ID) && + (i->device == dev->device || + i->device == (u16)PCI_ANY_ID)) { + return i->func_map; + } + } + return 0; +} + +int pci_func_is_dma_source(struct pci_dev *dev, int fn) +{ + u8 fn_map = pci_get_dma_source_map(dev); + + if (fn_map & (1 << fn)) + return 1; + + return 0; +} + /* * IOMMUs with isolation capabilities need to be programmed with the * correct source ID of a device. In most cases, the source ID matches diff --git a/include/linux/pci.h b/include/linux/pci.h index ee21795..8f0fa7f 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1546,6 +1546,7 @@ enum pci_fixup_pass { #ifdef CONFIG_PCI_QUIRKS void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev); struct pci_dev *pci_get_dma_source(struct pci_dev *dev); +int pci_func_is_dma_source(struct pci_dev *dev, int fn); int pci_dev_specific_acs_enabled(struct pci_dev *dev, u16 acs_flags); #else static inline void pci_fixup_device(enum pci_fixup_pass pass, -- 1.7.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
