diff options
| author | Christoph Hellwig <hch@lst.de> | 2018-05-28 12:47:57 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-05-28 12:48:25 +0200 |
| commit | 0ead51c3fbd15a4bc91e984f1b18b5c9422fbb02 (patch) | |
| tree | ad7bf76bbc559ce3fa320ae03ce562e286d2ddc4 /arch/x86/kernel/pci-dma.c | |
| parent | 098afd981744061d37eb4d40bc3f755438570afb (diff) | |
x86/pci-dma: switch the VIA 32-bit DMA quirk to use the struct device flag
Instead of globally disabling > 32bit DMA using the arch_dma_supported
hook walk the PCI bus under the actually affected bridge and mark every
device with the dma_32bit_limit flag. This also gets rid of the
arch_dma_supported hook entirely.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/pci-dma.c')
| -rw-r--r-- | arch/x86/kernel/pci-dma.c | 27 |
1 files changed, 10 insertions, 17 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index b523414bc323..ab5d9dd668d2 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -15,7 +15,7 @@ #include <asm/x86_init.h> #include <asm/iommu_table.h> -static int forbid_dac __read_mostly; +static bool disable_dac_quirk __read_mostly; const struct dma_map_ops *dma_ops = &dma_direct_ops; EXPORT_SYMBOL(dma_ops); @@ -126,7 +126,7 @@ static __init int iommu_setup(char *p) if (!strncmp(p, "nodac", 5)) pr_warn("nodac option ignored.\n"); if (!strncmp(p, "usedac", 6)) { - forbid_dac = -1; + disable_dac_quirk = true; return 1; } #ifdef CONFIG_SWIOTLB @@ -151,19 +151,6 @@ static __init int iommu_setup(char *p) } early_param("iommu", iommu_setup); -int arch_dma_supported(struct device *dev, u64 mask) -{ -#ifdef CONFIG_PCI - if (mask > 0xffffffff && forbid_dac > 0) { - dev_info(dev, "PCI: Disallowing DAC for device\n"); - return 0; - } -#endif - - return 1; -} -EXPORT_SYMBOL(arch_dma_supported); - static int __init pci_iommu_init(void) { struct iommu_table_entry *p; @@ -186,11 +173,17 @@ rootfs_initcall(pci_iommu_init); #ifdef CONFIG_PCI /* Many VIA bridges seem to corrupt data for DAC. Disable it here */ +static int via_no_dac_cb(struct pci_dev *pdev, void *data) +{ + pdev->dev.dma_32bit_limit = true; + return 0; +} + static void via_no_dac(struct pci_dev *dev) { - if (forbid_dac == 0) { + if (!disable_dac_quirk) { dev_info(&dev->dev, "disabling DAC on VIA PCI bridge\n"); - forbid_dac = 1; + pci_walk_bus(dev->subordinate, via_no_dac_cb, NULL); } } DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, |