#include <linux/pci.h>
#include <linux/module.h>
#include <asm/io.h>
-#include <asm/proto.h>
+#include <asm/iommu.h>
#include <asm/calgary.h>
int iommu_merge __read_mostly = 0;
int iommu_bio_merge __read_mostly = 0;
EXPORT_SYMBOL(iommu_bio_merge);
-int iommu_sac_force __read_mostly = 0;
-EXPORT_SYMBOL(iommu_sac_force);
+static int iommu_sac_force __read_mostly = 0;
int no_iommu __read_mostly;
#ifdef CONFIG_IOMMU_DEBUG
}
EXPORT_SYMBOL(dma_set_mask);
-/* iommu=[size][,noagp][,off][,force][,noforce][,leak][,memaper[=order]][,merge]
- [,forcesac][,fullflush][,nomerge][,biomerge]
- size set size of iommu (in bytes)
- noagp don't initialize the AGP driver and use full aperture.
- off don't use the IOMMU
- leak turn on simple iommu leak tracing (only when CONFIG_IOMMU_LEAK is on)
- memaper[=order] allocate an own aperture over RAM with size 32MB^order.
- noforce don't force IOMMU usage. Default.
- force Force IOMMU.
- merge Do lazy merging. This may improve performance on some block devices.
- Implies force (experimental)
- biomerge Do merging at the BIO layer. This is more efficient than merge,
- but should be only done with very big IOMMUs. Implies merge,force.
- nomerge Don't do SG merging.
- forcesac For SAC mode for masks <40bits (experimental)
- fullflush Flush IOMMU on each allocation (default)
- nofullflush Don't use IOMMU fullflush
- 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
-*/
+/*
+ * See <Documentation/x86_64/boot-options.txt> for the iommu kernel parameter
+ * documentation.
+ */
__init int iommu_setup(char *p)
{
iommu_merge = 1;
return 0;
}
+void pci_iommu_shutdown(void)
+{
+ gart_iommu_shutdown();
+}
+
+#ifdef CONFIG_PCI
+/* Many VIA bridges seem to corrupt data for DAC. Disable it here */
+
+static __devinit void via_no_dac(struct pci_dev *dev)
+{
+ if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && forbid_dac == 0) {
+ printk(KERN_INFO "PCI: VIA PCI bridge detected. Disabling DAC.\n");
+ forbid_dac = 1;
+ }
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac);
+#endif
/* Must execute after PCI subsystem */
fs_initcall(pci_iommu_init);