Merge tag 'iommu-updates-v3.15' of git://git.kernel.org/pub/scm/linux/kernel/git...

[cascardo/linux.git] / drivers / iommu / amd_iommu_types.h

diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index cff039d..f1a5abf 100644 (file)
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -99,7 +99,12 @@
 #define FEATURE_GLXVAL_SHIFT   14
 #define FEATURE_GLXVAL_MASK    (0x03ULL << FEATURE_GLXVAL_SHIFT)
 
-#define PASID_MASK             0x000fffff
+/* Note:
+ * The current driver only support 16-bit PASID.
+ * Currently, hardware only implement upto 16-bit PASID
+ * even though the spec says it could have upto 20 bits.
+ */
+#define PASID_MASK             0x0000ffff
 
 /* MMIO status bits */
 #define MMIO_STATUS_EVT_INT_MASK       (1 << 1)
@@ -697,8 +702,8 @@ extern unsigned long *amd_iommu_pd_alloc_bitmap;
  */
 extern u32 amd_iommu_unmap_flush;
 
-/* Smallest number of PASIDs supported by any IOMMU in the system */
-extern u32 amd_iommu_max_pasids;
+/* Smallest max PASID supported by any IOMMU in the system */
+extern u32 amd_iommu_max_pasid;
 
 extern bool amd_iommu_v2_present;