@@ -149,7 +149,7 @@ void __init xen_swiotlb_init(int verbose)
int rc;
unsigned long nr_tbl;
- nr_tbl = swioltb_nr_tbl();
+ nr_tbl = swiotlb_nr_tbl();
if (nr_tbl)
xen_io_tlb_nslabs = nr_tbl;
else {
@@ -24,7 +24,12 @@ 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);
+extern unsigned long swiotlb_nr_tbl(void);
+
+static inline bool swiotlb_enabled(void)
+{
+ return !!swiotlb_nr_tbl();
+}
/*
* Enumeration for sync targets
@@ -110,11 +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)
+unsigned long swiotlb_nr_tbl(void)
{
return io_tlb_nslabs;
}
-
+EXPORT_SYMBOL_GPL(swiotlb_nr_tbl);
/* Note that this doesn't work with highmem page */
static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
volatile void *address)
@@ -321,6 +321,7 @@ void __init swiotlb_free(void)
free_bootmem_late(__pa(io_tlb_start),
PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
}
+ io_tlb_nslabs = 0;
}
static int is_swiotlb_buffer(phys_addr_t paddr)
As a mechanism to detect whether SWIOTLB is enabled or not. And as such, we might as well wrap it within an 'swiotlb_enabled()' function that will call the swiotlb_nr_tlb. We also fix the spelling - it was swioltb instead of swiotlb. CC: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> --- drivers/xen/swiotlb-xen.c | 2 +- include/linux/swiotlb.h | 7 ++++++- lib/swiotlb.c | 5 +++-- 3 files changed, 10 insertions(+), 4 deletions(-)