path: root/lib/swiotlb.c
diff options
authorLinus Torvalds <torvalds@linux-foundation.org>2013-04-20 18:40:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-20 18:40:36 -0700
commit830ac8524f301da8867400777d5c19e6d01ec525 (patch)
tree8d8588c66e9d424973304a84e6857d1a87695eaa /lib/swiotlb.c
parentdb93f8b42036bd60d95e8d28ee98b308d5846b9f (diff)
parent157752d84f5df47e01577970f9c5f61a0b9f4546 (diff)
Merge branch 'x86-kdump-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull kdump fixes from Peter Anvin: "The kexec/kdump people have found several problems with the support for loading over 4 GiB that was introduced in this merge cycle. This is partly due to a number of design problems inherent in the way the various pieces of kdump fit together (it is pretty horrifically manual in many places.) After a *lot* of iterations this is the patchset that was agreed upon, but of course it is now very late in the cycle. However, because it changes both the syntax and semantics of the crashkernel option, it would be desirable to avoid a stable release with the broken interfaces." I'm not happy with the timing, since originally the plan was to release the final 3.9 tomorrow. But apparently I'm doing an -rc8 instead... * 'x86-kdump-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: kexec: use Crash kernel for Crash kernel low x86, kdump: Change crashkernel_high/low= to crashkernel=,high/low x86, kdump: Retore crashkernel= to allocate under 896M x86, kdump: Set crashkernel_low automatically
Diffstat (limited to 'lib/swiotlb.c')
1 files changed, 15 insertions, 4 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index bfe02b8fc55..d23762e6652 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -105,9 +105,9 @@ setup_io_tlb_npages(char *str)
if (!strcmp(str, "force"))
swiotlb_force = 1;
- return 1;
+ return 0;
-__setup("swiotlb=", setup_io_tlb_npages);
+early_param("swiotlb", setup_io_tlb_npages);
/* make io_tlb_overflow tunable too? */
unsigned long swiotlb_nr_tbl(void)
@@ -115,6 +115,18 @@ unsigned long swiotlb_nr_tbl(void)
return io_tlb_nslabs;
+/* default to 64MB */
+#define IO_TLB_DEFAULT_SIZE (64UL<<20)
+unsigned long swiotlb_size_or_default(void)
+ unsigned long size;
+ size = io_tlb_nslabs << IO_TLB_SHIFT;
+ return size ? size : (IO_TLB_DEFAULT_SIZE);
/* Note that this doesn't work with highmem page */
static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
volatile void *address)
@@ -188,8 +200,7 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
void __init
swiotlb_init(int verbose)
- /* default to 64MB */
- size_t default_size = 64UL<<20;
+ size_t default_size = IO_TLB_DEFAULT_SIZE;
unsigned char *vstart;
unsigned long bytes;