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| author | Bjorn Helgaas <bhelgaas@google.com> | 2019-05-14 02:34:45 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2019-05-14 02:34:45 +0300 |
| commit | f2e94683162565ff02d8d7386fadee175ab55e40 (patch) | |
| tree | fb9752bf2288737623456872d93791b40c30582f /drivers/iommu | |
| parent | ee6df38da8485b143cc5eccee569ae3e238be10a (diff) | |
| parent | 90199c951bd2a6248e55a8db3368a2568e3b3edc (diff) | |
| download | linux-f2e94683162565ff02d8d7386fadee175ab55e40.tar.xz | |
Merge branch 'pci/iova-dma-ranges'
- Add list of legal DMA address ranges to PCI host bridge (Srinath
Mannam)
- Reserve inaccessible DMA ranges so IOMMU doesn't allocate them (Srinath
Mannam)
- Parse iProc DT dma-ranges to learn what PCI devices can reach via DMA
(Srinath Mannam)
* pci/iova-dma-ranges:
PCI: iproc: Add sorted dma ranges resource entries to host bridge
iommu/dma: Reserve IOVA for PCIe inaccessible DMA address
PCI: Add dma_ranges window list
# Conflicts:
# drivers/pci/probe.c
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/dma-iommu.c | 35 |
1 files changed, 32 insertions, 3 deletions
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 77aabe637a60..954ae11461a3 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -206,12 +206,13 @@ static int cookie_init_hw_msi_region(struct iommu_dma_cookie *cookie, return 0; } -static void iova_reserve_pci_windows(struct pci_dev *dev, +static int iova_reserve_pci_windows(struct pci_dev *dev, struct iova_domain *iovad) { struct pci_host_bridge *bridge = pci_find_host_bridge(dev->bus); struct resource_entry *window; unsigned long lo, hi; + phys_addr_t start = 0, end; resource_list_for_each_entry(window, &bridge->windows) { if (resource_type(window->res) != IORESOURCE_MEM) @@ -221,6 +222,31 @@ static void iova_reserve_pci_windows(struct pci_dev *dev, hi = iova_pfn(iovad, window->res->end - window->offset); reserve_iova(iovad, lo, hi); } + + /* Get reserved DMA windows from host bridge */ + resource_list_for_each_entry(window, &bridge->dma_ranges) { + end = window->res->start - window->offset; +resv_iova: + if (end > start) { + lo = iova_pfn(iovad, start); + hi = iova_pfn(iovad, end); + reserve_iova(iovad, lo, hi); + } else { + /* dma_ranges list should be sorted */ + dev_err(&dev->dev, "Failed to reserve IOVA\n"); + return -EINVAL; + } + + start = window->res->end - window->offset + 1; + /* If window is last entry */ + if (window->node.next == &bridge->dma_ranges && + end != ~(dma_addr_t)0) { + end = ~(dma_addr_t)0; + goto resv_iova; + } + } + + return 0; } static int iova_reserve_iommu_regions(struct device *dev, @@ -232,8 +258,11 @@ static int iova_reserve_iommu_regions(struct device *dev, LIST_HEAD(resv_regions); int ret = 0; - if (dev_is_pci(dev)) - iova_reserve_pci_windows(to_pci_dev(dev), iovad); + if (dev_is_pci(dev)) { + ret = iova_reserve_pci_windows(to_pci_dev(dev), iovad); + if (ret) + return ret; + } iommu_get_resv_regions(dev, &resv_regions); list_for_each_entry(region, &resv_regions, list) { |