Messages in this thread Patch in this message | | | From | Lu Baolu <> | Subject | [PATCH v3 3/8] iommu/vt-d: Expose ISA direct mapping region via iommu_get_resv_regions | Date | Mon, 29 Apr 2019 10:09:20 +0800 |
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From: James Sewart <jamessewart@arista.com>
To support mapping ISA region via iommu_group_create_direct_mappings, make sure its exposed by iommu_get_resv_regions. This allows deduplication of reserved region mappings.
Signed-off-by: James Sewart <jamessewart@arista.com> --- drivers/iommu/intel-iommu.c | 43 +++++++++++++++++++++++++++++-------- 1 file changed, 34 insertions(+), 9 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index af025955f1bc..e9f31b062305 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -339,6 +339,8 @@ static LIST_HEAD(dmar_rmrr_units); #define for_each_rmrr_units(rmrr) \ list_for_each_entry(rmrr, &dmar_rmrr_units, list) +static struct iommu_resv_region *isa_resv_region; + /* bitmap for indexing intel_iommus */ static int g_num_of_iommus; @@ -2785,26 +2787,33 @@ static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr, rmrr->end_address); } +static inline struct iommu_resv_region *iommu_get_isa_resv_region(void) +{ + if (!isa_resv_region) + isa_resv_region = iommu_alloc_resv_region(0, 1UL << 24, 0, + IOMMU_RESV_DIRECT); + + return isa_resv_region; +} + #ifdef CONFIG_INTEL_IOMMU_FLOPPY_WA -static inline void iommu_prepare_isa(void) +static inline void iommu_prepare_isa(struct pci_dev *pdev) { - struct pci_dev *pdev; int ret; + struct iommu_resv_region *reg = iommu_get_isa_resv_region(); - pdev = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL); - if (!pdev) + if (!reg) return; pr_info("Prepare 0-16MiB unity mapping for LPC\n"); - ret = iommu_prepare_identity_map(&pdev->dev, 0, 16*1024*1024 - 1); + ret = iommu_prepare_identity_map(&pdev->dev, reg->start, + reg->start + reg->length - 1); if (ret) pr_err("Failed to create 0-16MiB identity map - floppy might not work\n"); - - pci_dev_put(pdev); } #else -static inline void iommu_prepare_isa(void) +static inline void iommu_prepare_isa(struct pci_dev *pdev) { return; } @@ -3293,6 +3302,7 @@ static int __init init_dmars(void) struct dmar_rmrr_unit *rmrr; bool copied_tables = false; struct device *dev; + struct pci_dev *pdev; struct intel_iommu *iommu; int i, ret; @@ -3473,7 +3483,11 @@ static int __init init_dmars(void) } } - iommu_prepare_isa(); + pdev = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL); + if (pdev) { + iommu_prepare_isa(pdev); + pci_dev_put(pdev); + } domains_done: @@ -5498,6 +5512,17 @@ static void intel_iommu_get_resv_regions(struct device *device, } rcu_read_unlock(); +#ifdef CONFIG_INTEL_IOMMU_FLOPPY_WA + if (dev_is_pci(device)) { + struct pci_dev *pdev = to_pci_dev(device); + + if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA) { + reg = iommu_get_isa_resv_region(); + list_add_tail(®->list, head); + } + } +#endif /* CONFIG_INTEL_IOMMU_FLOPPY_WA */ + reg = iommu_alloc_resv_region(IOAPIC_RANGE_START, IOAPIC_RANGE_END - IOAPIC_RANGE_START + 1, 0, IOMMU_RESV_MSI); -- 2.17.1
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