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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-09-20 01:23:30 +0900
committerIngo Molnar <mingo@elte.hu>2008-09-22 20:43:37 +0200
commitafa9fdc2f5f8e4d98f3e77bfa204412cbc181346 (patch)
tree8e6c390d8dc18734f6071d2ddd7a2bca01fe9000 /arch/x86/kernel/pci-gart_64.c
parented6dc4981368aa8ac89b0ea61535cfa2b03533cb (diff)
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iommu: remove fullflush and nofullflush in IOMMU generic option
This patch against tip/x86/iommu virtually reverts 2842e5bf3115193f05dc9dac20f940e7abf44c1a. But just reverting the commit breaks AMD IOMMU so this patch also includes some fixes. The above commit adds new two options to x86 IOMMU generic kernel boot options, fullflush and nofullflush. But such change that affects all the IOMMUs needs more discussion (all IOMMU parties need the chance to discuss it): http://lkml.org/lkml/2008/9/19/106 Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/pci-gart_64.c')
-rw-r--r--arch/x86/kernel/pci-gart_64.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 3dcb1ad..9e390f1 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))