summaryrefslogtreecommitdiff
path: root/arch/sparc/mm/gup.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/mm/gup.c')
-rw-r--r--arch/sparc/mm/gup.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/sparc/mm/gup.c b/arch/sparc/mm/gup.c
index 5335ba3c850e..357b6047653a 100644
--- a/arch/sparc/mm/gup.c
+++ b/arch/sparc/mm/gup.c
@@ -12,6 +12,7 @@
#include <linux/pagemap.h>
#include <linux/rwsem.h>
#include <asm/pgtable.h>
+#include <asm/adi.h>
/*
* The performance critical leaf functions are made noinline otherwise gcc
@@ -201,6 +202,24 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
pgd_t *pgdp;
int nr = 0;
+#ifdef CONFIG_SPARC64
+ if (adi_capable()) {
+ long addr = start;
+
+ /* If userspace has passed a versioned address, kernel
+ * will not find it in the VMAs since it does not store
+ * the version tags in the list of VMAs. Storing version
+ * tags in list of VMAs is impractical since they can be
+ * changed any time from userspace without dropping into
+ * kernel. Any address search in VMAs will be done with
+ * non-versioned addresses. Ensure the ADI version bits
+ * are dropped here by sign extending the last bit before
+ * ADI bits. IOMMU does not implement version tags.
+ */
+ addr = (addr << (long)adi_nbits()) >> (long)adi_nbits();
+ start = addr;
+ }
+#endif
start &= PAGE_MASK;
addr = start;
len = (unsigned long) nr_pages << PAGE_SHIFT;
@@ -231,6 +250,24 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
pgd_t *pgdp;
int nr = 0;
+#ifdef CONFIG_SPARC64
+ if (adi_capable()) {
+ long addr = start;
+
+ /* If userspace has passed a versioned address, kernel
+ * will not find it in the VMAs since it does not store
+ * the version tags in the list of VMAs. Storing version
+ * tags in list of VMAs is impractical since they can be
+ * changed any time from userspace without dropping into
+ * kernel. Any address search in VMAs will be done with
+ * non-versioned addresses. Ensure the ADI version bits
+ * are dropped here by sign extending the last bit before
+ * ADI bits. IOMMU does not implements version tags,
+ */
+ addr = (addr << (long)adi_nbits()) >> (long)adi_nbits();
+ start = addr;
+ }
+#endif
start &= PAGE_MASK;
addr = start;
len = (unsigned long) nr_pages << PAGE_SHIFT;