iommu/vt-d: Clean up pasid quirk for pre-production devices

The pasid28 quirk is needed only for some pre-production devices.
Remove it to make the code concise.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 2 insertions, 30 deletions

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index fd5cfd85c166..d79e3ebbe437 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -485,37 +485,14 @@ static int dmar_forcedac;
 static int intel_iommu_strict;
 static int intel_iommu_superpage = 1;
 static int intel_iommu_ecs = 1;
-static int intel_iommu_pasid28;
 static int iommu_identity_mapping;
 
 #define IDENTMAP_ALL            1
 #define IDENTMAP_GFX            2
 #define IDENTMAP_AZALIA         4
 
-/* Broadwell and Skylake have broken ECS support — normal so-called "second
- * level" translation of DMA requests-without-PASID doesn't actually happen
- * unless you also set the NESTE bit in an extended context-entry. Which of
- * course means that SVM doesn't work because it's trying to do nested
- * translation of the physical addresses it finds in the process page tables,
- * through the IOVA->phys mapping found in the "second level" page tables.
- *
- * The VT-d specification was retroactively changed to change the definition
- * of the capability bits and pretend that Broadwell/Skylake never happened...
- * but unfortunately the wrong bit was changed. It's ECS which is broken, but
- * for some reason it was the PASID capability bit which was redefined (from
- * bit 28 on BDW/SKL to bit 40 in future).
- *
- * So our test for ECS needs to eschew those implementations which set the old
- * PASID capabiity bit 28, since those are the ones on which ECS is broken.
- * Unless we are working around the 'pasid28' limitations, that is, by putting
- * the device into passthrough mode for normal DMA and thus masking the bug.
- */
-#define ecs_enabled(iommu) (intel_iommu_ecs && ecap_ecs(iommu->ecap) && \
-                            (intel_iommu_pasid28 || !ecap_broken_pasid(iommu->ecap)))
-/* PASID support is thus enabled if ECS is enabled and *either* of the old
- * or new capability bits are set. */
-#define pasid_enabled(iommu) (ecs_enabled(iommu) &&                     \
-                              (ecap_pasid(iommu->ecap) || ecap_broken_pasid(iommu->ecap)))
+#define ecs_enabled(iommu)      (intel_iommu_ecs && ecap_ecs(iommu->ecap))
+#define pasid_enabled(iommu)    (ecs_enabled(iommu) && ecap_pasid(iommu->ecap))
 
 int intel_iommu_gfx_mapped;
 EXPORT_SYMBOL_GPL(intel_iommu_gfx_mapped);
@@ -578,11 +555,6 @@ static int __init intel_iommu_setup(char *str)
                         printk(KERN_INFO
                                 "Intel-IOMMU: disable extended context table support\n");
                         intel_iommu_ecs = 0;
-                } else if (!strncmp(str, "pasid28", 7)) {
-                        printk(KERN_INFO
-                                "Intel-IOMMU: enable pre-production PASID support\n");
-                        intel_iommu_pasid28 = 1;
-                        iommu_identity_mapping |= IDENTMAP_GFX;
                 } else if (!strncmp(str, "tboot_noforce", 13)) {
                         printk(KERN_INFO
                                 "Intel-IOMMU: not forcing on after tboot. This could expose security risk for tboot\n");