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authorLinus Torvalds <torvalds@linux-foundation.org>2011-06-09 12:52:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-06-09 12:52:44 -0700
commit361932bf84657b5dc0779046c751f06998c0d81f (patch)
treed39ea8018bd35db9701d343411865529d89255a9
parent90494cc567319cd53574306f3b94fb3c7ff8fe88 (diff)
parent5f98ecdbcef1920323d8777c0ba55dbd4335d3cf (diff)
Merge branch 'stable/xen-swiotlb.bugfix' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb-2.6
* 'stable/xen-swiotlb.bugfix' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb-2.6: swiotlb: Export swioltb_nr_tbl and utilize it as appropiate.
-rw-r--r--drivers/xen/swiotlb-xen.c12
-rw-r--r--include/linux/swiotlb.h1
-rw-r--r--lib/swiotlb.c5
3 files changed, 15 insertions, 3 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 65ea21a9749..6e8c15a2320 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -147,9 +147,15 @@ void __init xen_swiotlb_init(int verbose)
{
unsigned long bytes;
int rc;
-
- xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
- xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
+ unsigned long nr_tbl;
+
+ nr_tbl = swioltb_nr_tbl();
+ if (nr_tbl)
+ xen_io_tlb_nslabs = nr_tbl;
+ else {
+ xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
+ xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
+ }
bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT;
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 8c0e349f4a6..445702c60d0 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -24,6 +24,7 @@ extern int swiotlb_force;
extern void swiotlb_init(int verbose);
extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
+extern unsigned long swioltb_nr_tbl(void);
/*
* Enumeration for sync targets
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 93ca08b8a45..99093b39614 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -110,6 +110,11 @@ setup_io_tlb_npages(char *str)
__setup("swiotlb=", setup_io_tlb_npages);
/* make io_tlb_overflow tunable too? */
+unsigned long swioltb_nr_tbl(void)
+{
+ return io_tlb_nslabs;
+}
+
/* Note that this doesn't work with highmem page */
static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
volatile void *address)