Merge master.kernel.org:/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw

[pandora-kernel.git] / arch / x86_64 / kernel / pci-dma.c

diff --git a/arch/x86_64/kernel/pci-dma.c b/arch/x86_64/kernel/pci-dma.c
index 9c44f4f..683b7a5 100644 (file)
--- a/arch/x86_64/kernel/pci-dma.c
+++ b/arch/x86_64/kernel/pci-dma.c
@@ -170,8 +170,20 @@ void dma_free_coherent(struct device *dev, size_t size,
 }
 EXPORT_SYMBOL(dma_free_coherent);
 
+static int forbid_dac __read_mostly;
+
 int dma_supported(struct device *dev, u64 mask)
 {
+#ifdef CONFIG_PCI
+       if (mask > 0xffffffff && forbid_dac > 0) {
+
+
+
+               printk(KERN_INFO "PCI: Disallowing DAC for device %s\n", dev->bus_id);
+               return 0;
+       }
+#endif
+
        if (dma_ops->dma_supported)
                return dma_ops->dma_supported(dev, mask);
 
@@ -231,56 +243,71 @@ EXPORT_SYMBOL(dma_set_mask);
    allowed  overwrite iommu off workarounds for specific chipsets.
    soft         Use software bounce buffering (default for Intel machines)
    noaperture Don't touch the aperture for AGP.
+   allowdac Allow DMA >4GB
+   nodac    Forbid DMA >4GB
+   panic    Force panic when IOMMU overflows
 */
 __init int iommu_setup(char *p)
 {
-    iommu_merge = 1;
-
-    while (*p) {
-           if (!strncmp(p,"off",3))
-                   no_iommu = 1;
-           /* gart_parse_options has more force support */
-           if (!strncmp(p,"force",5))
-                   force_iommu = 1;
-           if (!strncmp(p,"noforce",7)) {
-                   iommu_merge = 0;
-                   force_iommu = 0;
-           }
-
-           if (!strncmp(p, "biomerge",8)) {
-                   iommu_bio_merge = 4096;
-                   iommu_merge = 1;
-                   force_iommu = 1;
-           }
-           if (!strncmp(p, "panic",5))
-                   panic_on_overflow = 1;
-           if (!strncmp(p, "nopanic",7))
-                   panic_on_overflow = 0;
-           if (!strncmp(p, "merge",5)) {
-                   iommu_merge = 1;
-                   force_iommu = 1;
-           }
-           if (!strncmp(p, "nomerge",7))
-                   iommu_merge = 0;
-           if (!strncmp(p, "forcesac",8))
-                   iommu_sac_force = 1;
+       iommu_merge = 1;
+
+       if (!p)
+               return -EINVAL;
+
+       while (*p) {
+               if (!strncmp(p,"off",3))
+                       no_iommu = 1;
+               /* gart_parse_options has more force support */
+               if (!strncmp(p,"force",5))
+                       force_iommu = 1;
+               if (!strncmp(p,"noforce",7)) {
+                       iommu_merge = 0;
+                       force_iommu = 0;
+               }
+
+               if (!strncmp(p, "biomerge",8)) {
+                       iommu_bio_merge = 4096;
+                       iommu_merge = 1;
+                       force_iommu = 1;
+               }
+               if (!strncmp(p, "panic",5))
+                       panic_on_overflow = 1;
+               if (!strncmp(p, "nopanic",7))
+                       panic_on_overflow = 0;
+               if (!strncmp(p, "merge",5)) {
+                       iommu_merge = 1;
+                       force_iommu = 1;
+               }
+               if (!strncmp(p, "nomerge",7))
+                       iommu_merge = 0;
+               if (!strncmp(p, "forcesac",8))
+                       iommu_sac_force = 1;
+               if (!strncmp(p, "allowdac", 8))
+                       forbid_dac = 0;
+               if (!strncmp(p, "nodac", 5))
+                       forbid_dac = -1;
 
 #ifdef CONFIG_SWIOTLB
-           if (!strncmp(p, "soft",4))
-                   swiotlb = 1;
+               if (!strncmp(p, "soft",4))
+                       swiotlb = 1;
 #endif
 
 #ifdef CONFIG_IOMMU
-           gart_parse_options(p);
+               gart_parse_options(p);
 #endif
 
-           p += strcspn(p, ",");
-           if (*p == ',')
-                   ++p;
-    }
-    return 1;
+#ifdef CONFIG_CALGARY_IOMMU
+               if (!strncmp(p, "calgary", 7))
+                       use_calgary = 1;
+#endif /* CONFIG_CALGARY_IOMMU */
+
+               p += strcspn(p, ",");
+               if (*p == ',')
+                       ++p;
+       }
+       return 0;
 }
-__setup("iommu=", iommu_setup);
+early_param("iommu", iommu_setup);
 
 void __init pci_iommu_alloc(void)
 {