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-rw-r--r--arch/ia64/include/asm/iommu.h2
-rw-r--r--arch/ia64/kernel/pci-dma.c1
-rw-r--r--arch/x86/include/asm/iommu.h1
-rw-r--r--arch/x86/kernel/pci-dma.c11
4 files changed, 15 insertions, 0 deletions
diff --git a/arch/ia64/include/asm/iommu.h b/arch/ia64/include/asm/iommu.h
index 105c93b00b1b..b6a809fa2995 100644
--- a/arch/ia64/include/asm/iommu.h
+++ b/arch/ia64/include/asm/iommu.h
@@ -11,10 +11,12 @@ extern void no_iommu_init(void);
extern int force_iommu, no_iommu;
extern int iommu_pass_through;
extern int iommu_detected;
+extern int iommu_group_mf;
#else
#define iommu_pass_through (0)
#define no_iommu (1)
#define iommu_detected (0)
+#define iommu_group_mf (0)
#endif
extern void iommu_dma_init(void);
extern void machvec_init(const char *name);
diff --git a/arch/ia64/kernel/pci-dma.c b/arch/ia64/kernel/pci-dma.c
index c16162c70860..eb1175720050 100644
--- a/arch/ia64/kernel/pci-dma.c
+++ b/arch/ia64/kernel/pci-dma.c
@@ -33,6 +33,7 @@ int force_iommu __read_mostly;
#endif
int iommu_pass_through;
+int iommu_group_mf;
/* Dummy device used for NULL arguments (normally ISA). Better would
be probably a smaller DMA mask, but this is bug-to-bug compatible
diff --git a/arch/x86/include/asm/iommu.h b/arch/x86/include/asm/iommu.h
index 345c99cef152..dffc38ee6255 100644
--- a/arch/x86/include/asm/iommu.h
+++ b/arch/x86/include/asm/iommu.h
@@ -5,6 +5,7 @@ extern struct dma_map_ops nommu_dma_ops;
extern int force_iommu, no_iommu;
extern int iommu_detected;
extern int iommu_pass_through;
+extern int iommu_group_mf;
/* 10 seconds */
#define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 80dc793b3f63..1c4d769e21ea 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -45,6 +45,15 @@ int iommu_detected __read_mostly = 0;
*/
int iommu_pass_through __read_mostly;
+/*
+ * Group multi-function PCI devices into a single device-group for the
+ * iommu_device_group interface. This tells the iommu driver to pretend
+ * it cannot distinguish between functions of a device, exposing only one
+ * group for the device. Useful for disallowing use of individual PCI
+ * functions from userspace drivers.
+ */
+int iommu_group_mf __read_mostly;
+
extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
/* Dummy device used for NULL arguments (normally ISA). */
@@ -169,6 +178,8 @@ static __init int iommu_setup(char *p)
#endif
if (!strncmp(p, "pt", 2))
iommu_pass_through = 1;
+ if (!strncmp(p, "group_mf", 8))
+ iommu_group_mf = 1;
gart_parse_options(p);