diff options
Diffstat (limited to 'drivers/iommu/apple-dart.c')
| -rw-r--r-- | drivers/iommu/apple-dart.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index 96d4a1f8de79..565ef5598811 100644 --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -15,6 +15,7 @@ #include <linux/bitfield.h> #include <linux/clk.h> #include <linux/dev_printk.h> +#include <linux/dma-iommu.h> #include <linux/dma-mapping.h> #include <linux/err.h> #include <linux/interrupt.h> @@ -737,6 +738,31 @@ static int apple_dart_def_domain_type(struct device *dev) return 0; } +#ifndef CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR +/* Keep things compiling when CONFIG_PCI_APPLE isn't selected */ +#define CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR 0 +#endif +#define DOORBELL_ADDR (CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR & PAGE_MASK) + +static void apple_dart_get_resv_regions(struct device *dev, + struct list_head *head) +{ + if (IS_ENABLED(CONFIG_PCIE_APPLE) && dev_is_pci(dev)) { + struct iommu_resv_region *region; + int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO; + + region = iommu_alloc_resv_region(DOORBELL_ADDR, + PAGE_SIZE, prot, + IOMMU_RESV_MSI); + if (!region) + return; + + list_add_tail(®ion->list, head); + } + + iommu_dma_get_resv_regions(dev, head); +} + static const struct iommu_ops apple_dart_iommu_ops = { .domain_alloc = apple_dart_domain_alloc, .domain_free = apple_dart_domain_free, @@ -753,6 +779,8 @@ static const struct iommu_ops apple_dart_iommu_ops = { .device_group = apple_dart_device_group, .of_xlate = apple_dart_of_xlate, .def_domain_type = apple_dart_def_domain_type, + .get_resv_regions = apple_dart_get_resv_regions, + .put_resv_regions = generic_iommu_put_resv_regions, .pgsize_bitmap = -1UL, /* Restricted during dart probe */ }; |