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authorKyle McMartin <kyle@redhat.com>2009-02-04 17:29:19 -0500
committerIngo Molnar <mingo@elte.hu>2009-02-05 10:48:38 -0500
commit0cd5c3c80a0ebd68c08312fa7d8c13149cc61c4c (patch)
tree4dc6093ee08e668a182b38bd13cd85436555c4b6 /drivers
parentb534816b552d35bbd3c60702139ed5c7da2f55c2 (diff)
x86: disable intel_iommu support by default
Due to recurring issues with DMAR support on certain platforms. There's a number of filesystem corruption incidents reported: https://bugzilla.redhat.com/show_bug.cgi?id=479996 http://bugzilla.kernel.org/show_bug.cgi?id=12578 Provide a Kconfig option to change whether it is enabled by default. If disabled, it can still be reenabled by passing intel_iommu=on to the kernel. Keep the .config option off by default. Signed-off-by: Kyle McMartin <kyle@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-By: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/intel-iommu.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 3dfecb20d5e7..f4b7c79023ff 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -268,7 +268,12 @@ static long list_size;
268 268
269static void domain_remove_dev_info(struct dmar_domain *domain); 269static void domain_remove_dev_info(struct dmar_domain *domain);
270 270
271int dmar_disabled; 271#ifdef CONFIG_DMAR_DEFAULT_ON
272int dmar_disabled = 0;
273#else
274int dmar_disabled = 1;
275#endif /*CONFIG_DMAR_DEFAULT_ON*/
276
272static int __initdata dmar_map_gfx = 1; 277static int __initdata dmar_map_gfx = 1;
273static int dmar_forcedac; 278static int dmar_forcedac;
274static int intel_iommu_strict; 279static int intel_iommu_strict;
@@ -284,9 +289,12 @@ static int __init intel_iommu_setup(char *str)
284 if (!str) 289 if (!str)
285 return -EINVAL; 290 return -EINVAL;
286 while (*str) { 291 while (*str) {
287 if (!strncmp(str, "off", 3)) { 292 if (!strncmp(str, "on", 2)) {
293 dmar_disabled = 0;
294 printk(KERN_INFO "Intel-IOMMU: enabled\n");
295 } else if (!strncmp(str, "off", 3)) {
288 dmar_disabled = 1; 296 dmar_disabled = 1;
289 printk(KERN_INFO"Intel-IOMMU: disabled\n"); 297 printk(KERN_INFO "Intel-IOMMU: disabled\n");
290 } else if (!strncmp(str, "igfx_off", 8)) { 298 } else if (!strncmp(str, "igfx_off", 8)) {
291 dmar_map_gfx = 0; 299 dmar_map_gfx = 0;
292 printk(KERN_INFO 300 printk(KERN_INFO