Release 4.7 block/bounce.c
/* bounce buffer handling for block devices
*
* - Split from highmem.c
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/mm.h>
#include <linux/export.h>
#include <linux/swap.h>
#include <linux/gfp.h>
#include <linux/bio.h>
#include <linux/pagemap.h>
#include <linux/mempool.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/init.h>
#include <linux/hash.h>
#include <linux/highmem.h>
#include <linux/bootmem.h>
#include <linux/printk.h>
#include <asm/tlbflush.h>
#include <trace/events/block.h>
#define POOL_SIZE 64
#define ISA_POOL_SIZE 16
static mempool_t *page_pool, *isa_page_pool;
#if defined(CONFIG_HIGHMEM) || defined(CONFIG_NEED_BOUNCE_POOL)
static __init int init_emergency_pool(void)
{
#if defined(CONFIG_HIGHMEM) && !defined(CONFIG_MEMORY_HOTPLUG)
if (max_pfn <= max_low_pfn)
return 0;
#endif
page_pool = mempool_create_page_pool(POOL_SIZE, 0);
BUG_ON(!page_pool);
pr_info("pool size: %d pages\n", POOL_SIZE);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 38 | 66.67% | 1 | 25.00% |
| chris metcalf | chris metcalf | 11 | 19.30% | 1 | 25.00% |
| david vrabel | david vrabel | 6 | 10.53% | 1 | 25.00% |
| mitchel humpherys | mitchel humpherys | 2 | 3.51% | 1 | 25.00% |
| Total | 57 | 100.00% | 4 | 100.00% |
__initcall(init_emergency_pool);
#endif
#ifdef CONFIG_HIGHMEM
/*
* highmem version, map in to vec
*/
static void bounce_copy_vec(struct bio_vec *to, unsigned char *vfrom)
{
unsigned long flags;
unsigned char *vto;
local_irq_save(flags);
vto = kmap_atomic(to->bv_page);
memcpy(vto + to->bv_offset, vfrom, to->bv_len);
kunmap_atomic(vto);
local_irq_restore(flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 64 | 100.00% | 1 | 100.00% |
| Total | 64 | 100.00% | 1 | 100.00% |
#else /* CONFIG_HIGHMEM */
#define bounce_copy_vec(to, vfrom) \
memcpy(page_address((to)->bv_page) + (to)->bv_offset, vfrom, (to)->bv_len)
#endif /* CONFIG_HIGHMEM */
/*
* allocate pages in the DMA region for the ISA pool
*/
static void *mempool_alloc_pages_isa(gfp_t gfp_mask, void *data)
{
return mempool_alloc_pages(gfp_mask | GFP_DMA, data);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 24 | 100.00% | 1 | 100.00% |
| Total | 24 | 100.00% | 1 | 100.00% |
/*
* gets called "every" time someone init's a queue with BLK_BOUNCE_ISA
* as the max address, so check if the pool has already been created.
*/
int init_emergency_isa_pool(void)
{
if (isa_page_pool)
return 0;
isa_page_pool = mempool_create(ISA_POOL_SIZE, mempool_alloc_pages_isa,
mempool_free_pages, (void *) 0);
BUG_ON(!isa_page_pool);
pr_info("isa pool size: %d pages\n", ISA_POOL_SIZE);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 45 | 95.74% | 1 | 50.00% |
| mitchel humpherys | mitchel humpherys | 2 | 4.26% | 1 | 50.00% |
| Total | 47 | 100.00% | 2 | 100.00% |
/*
* Simple bounce buffer support for highmem pages. Depending on the
* queue gfp mask set, *to may or may not be a highmem page. kmap it
* always, it will do the Right Thing
*/
static void copy_to_high_bio_irq(struct bio *to, struct bio *from)
{
unsigned char *vfrom;
struct bio_vec tovec, *fromvec = from->bi_io_vec;
struct bvec_iter iter;
bio_for_each_segment(tovec, to, iter) {
if (tovec.bv_page != fromvec->bv_page) {
/*
* fromvec->bv_offset and fromvec->bv_len might have
* been modified by the block layer, so use the original
* copy, bounce_copy_vec already uses tovec->bv_len
*/
vfrom = page_address(fromvec->bv_page) +
tovec.bv_offset;
bounce_copy_vec(&tovec, vfrom);
flush_dcache_page(tovec.bv_page);
}
fromvec++;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 65 | 72.22% | 1 | 25.00% |
| kent overstreet | kent overstreet | 20 | 22.22% | 2 | 50.00% |
| gary king | gary king | 5 | 5.56% | 1 | 25.00% |
| Total | 90 | 100.00% | 4 | 100.00% |
static void bounce_end_io(struct bio *bio, mempool_t *pool)
{
struct bio *bio_orig = bio->bi_private;
struct bio_vec *bvec, *org_vec;
int i;
int start = bio_orig->bi_iter.bi_idx;
/*
* free up bounce indirect pages used
*/
bio_for_each_segment_all(bvec, bio, i) {
org_vec = bio_orig->bi_io_vec + i + start;
if (bvec->bv_page == org_vec->bv_page)
continue;
dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
mempool_free(bvec->bv_page, pool);
}
bio_orig->bi_error = bio->bi_error;
bio_endio(bio_orig);
bio_put(bio);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 92 | 82.14% | 1 | 25.00% |
| ming lei | ming lei | 11 | 9.82% | 1 | 25.00% |
| christoph hellwig | christoph hellwig | 8 | 7.14% | 1 | 25.00% |
| kent overstreet | kent overstreet | 1 | 0.89% | 1 | 25.00% |
| Total | 112 | 100.00% | 4 | 100.00% |
static void bounce_end_io_write(struct bio *bio)
{
bounce_end_io(bio, page_pool);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 17 | 94.44% | 1 | 50.00% |
| neil brown | neil brown | 1 | 5.56% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
static void bounce_end_io_write_isa(struct bio *bio)
{
bounce_end_io(bio, isa_page_pool);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 17 | 94.44% | 1 | 50.00% |
| neil brown | neil brown | 1 | 5.56% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
static void __bounce_end_io_read(struct bio *bio, mempool_t *pool)
{
struct bio *bio_orig = bio->bi_private;
if (!bio->bi_error)
copy_to_high_bio_irq(bio_orig, bio);
bounce_end_io(bio, pool);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 43 | 95.56% | 1 | 50.00% |
| christoph hellwig | christoph hellwig | 2 | 4.44% | 1 | 50.00% |
| Total | 45 | 100.00% | 2 | 100.00% |
static void bounce_end_io_read(struct bio *bio)
{
__bounce_end_io_read(bio, page_pool);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 17 | 94.44% | 1 | 50.00% |
| neil brown | neil brown | 1 | 5.56% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
static void bounce_end_io_read_isa(struct bio *bio)
{
__bounce_end_io_read(bio, isa_page_pool);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 17 | 94.44% | 1 | 50.00% |
| neil brown | neil brown | 1 | 5.56% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
mempool_t *pool)
{
struct bio *bio;
int rw = bio_data_dir(*bio_orig);
struct bio_vec *to, from;
struct bvec_iter iter;
unsigned i;
bio_for_each_segment(from, *bio_orig, iter)
if (page_to_pfn(from.bv_page) > queue_bounce_pfn(q))
goto bounce;
return;
bounce:
bio = bio_clone_bioset(*bio_orig, GFP_NOIO, fs_bio_set);
bio_for_each_segment_all(to, bio, i) {
struct page *page = to->bv_page;
if (page_to_pfn(page) <= queue_bounce_pfn(q))
continue;
to->bv_page = mempool_alloc(pool, q->bounce_gfp);
inc_zone_page_state(to->bv_page, NR_BOUNCE);
if (rw == WRITE) {
char *vto, *vfrom;
flush_dcache_page(page);
vto = page_address(to->bv_page) + to->bv_offset;
vfrom = kmap_atomic(page) + to->bv_offset;
memcpy(vto, vfrom, to->bv_len);
kunmap_atomic(vfrom);
}
}
trace_block_bio_bounce(q, *bio_orig);
bio->bi_flags |= (1 << BIO_BOUNCED);
if (pool == page_pool) {
bio->bi_end_io = bounce_end_io_write;
if (rw == READ)
bio->bi_end_io = bounce_end_io_read;
} else {
bio->bi_end_io = bounce_end_io_write_isa;
if (rw == READ)
bio->bi_end_io = bounce_end_io_read_isa;
}
bio->bi_private = *bio_orig;
*bio_orig = bio;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 197 | 70.36% | 1 | 10.00% |
| kent overstreet | kent overstreet | 54 | 19.29% | 3 | 30.00% |
| jens axboe | jens axboe | 16 | 5.71% | 3 | 30.00% |
| wang yanqing | wang yanqing | 9 | 3.21% | 1 | 10.00% |
| martin k. petersen | martin k. petersen | 3 | 1.07% | 1 | 10.00% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 1 | 0.36% | 1 | 10.00% |
| Total | 280 | 100.00% | 10 | 100.00% |
void blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
{
mempool_t *pool;
/*
* Data-less bio, nothing to bounce
*/
if (!bio_has_data(*bio_orig))
return;
/*
* for non-isa bounce case, just check if the bounce pfn is equal
* to or bigger than the highest pfn in the system -- in that case,
* don't waste time iterating over bio segments
*/
if (!(q->bounce_gfp & GFP_DMA)) {
if (queue_bounce_pfn(q) >= blk_max_pfn)
return;
pool = page_pool;
} else {
BUG_ON(!isa_page_pool);
pool = isa_page_pool;
}
/*
* slow path
*/
__blk_queue_bounce(q, bio_orig, pool);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 66 | 80.49% | 1 | 20.00% |
| jens axboe | jens axboe | 13 | 15.85% | 3 | 60.00% |
| martin k. petersen | martin k. petersen | 3 | 3.66% | 1 | 20.00% |
| Total | 82 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL(blk_queue_bounce);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david howells | david howells | 781 | 78.81% | 1 | 4.17% |
| kent overstreet | kent overstreet | 75 | 7.57% | 4 | 16.67% |
| jens axboe | jens axboe | 29 | 2.93% | 5 | 20.83% |
| chris metcalf | chris metcalf | 26 | 2.62% | 1 | 4.17% |
| mitchel humpherys | mitchel humpherys | 14 | 1.41% | 1 | 4.17% |
| ming lei | ming lei | 11 | 1.11% | 1 | 4.17% |
| christoph hellwig | christoph hellwig | 10 | 1.01% | 1 | 4.17% |
| wang yanqing | wang yanqing | 9 | 0.91% | 1 | 4.17% |
| david vrabel | david vrabel | 9 | 0.91% | 1 | 4.17% |
| tejun heo | tejun heo | 6 | 0.61% | 2 | 8.33% |
| martin k. petersen | martin k. petersen | 6 | 0.61% | 1 | 4.17% |
| gary king | gary king | 5 | 0.50% | 1 | 4.17% |
| neil brown | neil brown | 4 | 0.40% | 1 | 4.17% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 3 | 0.30% | 1 | 4.17% |
| li zefan | li zefan | 2 | 0.20% | 1 | 4.17% |
| paul gortmaker | paul gortmaker | 1 | 0.10% | 1 | 4.17% |
| Total | 991 | 100.00% | 24 | 100.00% |
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