diff options
| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2010-05-10 15:15:12 -0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2010-06-07 11:59:25 -0400 |
| commit | abbceff7d7a884968e876e52578da1db4a4f6b54 (patch) | |
| tree | 9a78609a90866a3a5313b35208e2e761ce4f3a77 | |
| parent | eb605a5754d050a25a9f00d718fb173f24c486ef (diff) | |
| download | linux-abbceff7d7a884968e876e52578da1db4a4f6b54.tar.bz2 | |
swiotlb: add the swiotlb initialization function with iotlb memory
This enables the caller to initialize swiotlb with its own iotlb
memory.
See "swiotlb: swiotlb: add swiotlb_tbl_map_single library function" for
full description of patchset.
[v2: changed ..with_tlb to ..with_tbl]
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Albert Herranz <albert_herranz@yahoo.es>
| -rw-r--r-- | include/linux/swiotlb.h | 1 | ||||
| -rw-r--r-- | lib/swiotlb.c | 48 |
2 files changed, 31 insertions, 18 deletions
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index 81a4e213c6cf..b406261d8887 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -23,6 +23,7 @@ extern int swiotlb_force; #define IO_TLB_SHIFT 11 extern void swiotlb_init(int verbose); +extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); extern void *swiotlb_alloc_coherent(struct device *hwdev, size_t size, diff --git a/lib/swiotlb.c b/lib/swiotlb.c index 783aff00024c..ec61e1507d0a 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -140,28 +140,14 @@ void swiotlb_print_info(void) (unsigned long long)pend); } -/* - * Statically reserve bounce buffer space and initialize bounce buffer data - * structures for the software IO TLB used to implement the DMA API. - */ -void __init -swiotlb_init_with_default_size(size_t default_size, int verbose) +void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) { unsigned long i, bytes; - if (!io_tlb_nslabs) { - io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); - io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); - } + bytes = nslabs << IO_TLB_SHIFT; - bytes = io_tlb_nslabs << IO_TLB_SHIFT; - - /* - * Get IO TLB memory from the low pages - */ - io_tlb_start = alloc_bootmem_low_pages(bytes); - if (!io_tlb_start) - panic("Cannot allocate SWIOTLB buffer"); + io_tlb_nslabs = nslabs; + io_tlb_start = tlb; io_tlb_end = io_tlb_start + bytes; /* @@ -185,6 +171,32 @@ swiotlb_init_with_default_size(size_t default_size, int verbose) swiotlb_print_info(); } +/* + * Statically reserve bounce buffer space and initialize bounce buffer data + * structures for the software IO TLB used to implement the DMA API. + */ +void __init +swiotlb_init_with_default_size(size_t default_size, int verbose) +{ + unsigned long bytes; + + if (!io_tlb_nslabs) { + io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); + io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); + } + + bytes = io_tlb_nslabs << IO_TLB_SHIFT; + + /* + * Get IO TLB memory from the low pages + */ + io_tlb_start = alloc_bootmem_low_pages(bytes); + if (!io_tlb_start) + panic("Cannot allocate SWIOTLB buffer"); + + swiotlb_init_with_tbl(io_tlb_start, io_tlb_nslabs, verbose); +} + void __init swiotlb_init(int verbose) { |