4 files changed, 19 insertions, 16 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 70537d117a96..c19212191c98 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -948,7 +948,7 @@ static dma_addr_t __map_single(struct device *dev,
         }
         address += offset;
 
-        if (unlikely(dma_dom->need_flush && !iommu_fullflush)) {
+        if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) {
                 iommu_flush_tlb(iommu, dma_dom->domain.id);
                 dma_dom->need_flush = false;
         } else if (unlikely(iommu_has_npcache(iommu)))
@@ -985,7 +985,7 @@ static void __unmap_single(struct amd_iommu *iommu,
 
         dma_ops_free_addresses(dma_dom, dma_addr, pages);
 
-        if (iommu_fullflush)
+        if (amd_iommu_unmap_flush)
                 iommu_flush_pages(iommu, dma_dom->domain.id, dma_addr, size);
 }
 
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index db0c83af44de..148fcfe22f17 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -122,6 +122,7 @@ LIST_HEAD(amd_iommu_unity_map);		/* a list of required unity mappings
                                            we find in ACPI */
 unsigned amd_iommu_aperture_order = 26; /* size of aperture in power of 2 */
 int amd_iommu_isolate;                  /* if 1, device isolation is enabled */
+bool amd_iommu_unmap_flush;             /* if true, flush on every unmap */
 
 LIST_HEAD(amd_iommu_list);              /* list of all AMD IOMMUs in the
                                            system */
@@ -1144,7 +1145,7 @@ int __init amd_iommu_init(void)
         else
                 printk("disabled\n");
 
-        if (iommu_fullflush)
+        if (amd_iommu_unmap_flush)
                 printk(KERN_INFO "AMD IOMMU: IO/TLB flush on unmap enabled\n");
         else
                 printk(KERN_INFO "AMD IOMMU: Lazy IO/TLB flushing enabled\n");
@@ -1214,6 +1215,8 @@ static int __init parse_amd_iommu_options(char *str)
         for (; *str; ++str) {
                 if (strncmp(str, "isolate", 7) == 0)
                         amd_iommu_isolate = 1;
+                if (strncmp(str, "fullflush", 11) == 0)
+                        amd_iommu_unmap_flush = true;
         }
 
         return 1;
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index d2f2c0158dc1..0a1408abcc62 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -16,15 +16,6 @@ EXPORT_SYMBOL(dma_ops);
 
 static int iommu_sac_force __read_mostly;
 
-/*
- * If this is disabled the IOMMU will use an optimized flushing strategy
- * of only flushing when an mapping is reused. With it true the GART is
- * flushed for every mapping. Problem is that doing the lazy flush seems
- * to trigger bugs with some popular PCI cards, in particular 3ware (but
- * has been also also seen with Qlogic at least).
- */
-int iommu_fullflush;
-
 #ifdef CONFIG_IOMMU_DEBUG
 int panic_on_overflow __read_mostly = 1;
 int force_iommu __read_mostly = 1;
@@ -180,10 +171,6 @@ static __init int iommu_setup(char *p)
                 }
                 if (!strncmp(p, "nomerge", 7))
                         iommu_merge = 0;
-                if (!strncmp(p, "fullflush", 8))
-                        iommu_fullflush = 1;
-                if (!strncmp(p, "nofullflush", 11))
-                        iommu_fullflush = 0;
                 if (!strncmp(p, "forcesac", 8))
                         iommu_sac_force = 1;
                 if (!strncmp(p, "allowdac", 8))
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 3dcb1ad86e38..9e390f1bd46a 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -45,6 +45,15 @@ static unsigned long iommu_pages;	/* .. and in pages */
 
 static u32 *iommu_gatt_base;            /* Remapping table */
 
+/*
+ * If this is disabled the IOMMU will use an optimized flushing strategy
+ * of only flushing when an mapping is reused. With it true the GART is
+ * flushed for every mapping. Problem is that doing the lazy flush seems
+ * to trigger bugs with some popular PCI cards, in particular 3ware (but
+ * has been also also seen with Qlogic at least).
+ */
+int iommu_fullflush = 1;
+
 /* Allocation bitmap for the remapping area: */
 static DEFINE_SPINLOCK(iommu_bitmap_lock);
 /* Guarded by iommu_bitmap_lock: */
@@ -892,6 +901,10 @@ void __init gart_parse_options(char *p)
 #endif
         if (isdigit(*p) && get_option(&p, &arg))
                 iommu_size = arg;
+        if (!strncmp(p, "fullflush", 8))
+                iommu_fullflush = 1;
+        if (!strncmp(p, "nofullflush", 11))
+                iommu_fullflush = 0;
         if (!strncmp(p, "noagp", 5))
                 no_agp = 1;
         if (!strncmp(p, "noaperture", 10))