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swiotlb: Expose swiotlb_nr_tlb function to modules

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As a mechanism to detect whether SWIOTLB is enabled or not.
We also fix the spelling - it was swioltb instead of
swiotlb.

CC: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
[v1: Ripped out swiotlb_enabled]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2011-08-11 16:50:56 -04:00 • committed by Dave Airlie
parent bcdd6b2fd6
commit f21ffe9f6d
3 changed files with 5 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

2
drivers/xen/swiotlb-xen.c
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@ -153,7 +153,7 @@ void __init xen_swiotlb_init(int verbose)
char *m = NULL; char *m = NULL;
unsigned int repeat = 3; unsigned int repeat = 3;
nr_tbl = swioltb_nr_tbl(); nr_tbl = swiotlb_nr_tbl();
if (nr_tbl) if (nr_tbl)
xen_io_tlb_nslabs = nr_tbl; xen_io_tlb_nslabs = nr_tbl;
else { else {

2
include/linux/swiotlb.h
View file

@ -24,7 +24,7 @@ extern int swiotlb_force;
extern void swiotlb_init(int verbose); extern void swiotlb_init(int verbose);
extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
extern unsigned long swioltb_nr_tbl(void); extern unsigned long swiotlb_nr_tbl(void);
/* /*
* Enumeration for sync targets * Enumeration for sync targets

5
lib/swiotlb.c
View file

@ -110,11 +110,11 @@ setup_io_tlb_npages(char *str)
__setup("swiotlb=", setup_io_tlb_npages); __setup("swiotlb=", setup_io_tlb_npages);
/* make io_tlb_overflow tunable too? */ /* make io_tlb_overflow tunable too? */
unsigned long swioltb_nr_tbl(void) unsigned long swiotlb_nr_tbl(void)
{ {
return io_tlb_nslabs; return io_tlb_nslabs;
} }
EXPORT_SYMBOL_GPL(swiotlb_nr_tbl);
/* Note that this doesn't work with highmem page */ /* Note that this doesn't work with highmem page */
static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev, static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
volatile void *address) volatile void *address)
@ -321,6 +321,7 @@ void __init swiotlb_free(void)
free_bootmem_late(__pa(io_tlb_start), free_bootmem_late(__pa(io_tlb_start),
PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT)); PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
} }
io_tlb_nslabs = 0;
} }
static int is_swiotlb_buffer(phys_addr_t paddr) static int is_swiotlb_buffer(phys_addr_t paddr)