#define ISA_POOL_SIZE 16
static struct bio_set bounce_bio_set, bounce_bio_split;
-static mempool_t page_pool, isa_page_pool;
+static mempool_t page_pool;
static void init_bounce_bioset(void)
{
#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);
-}
-
-static DEFINE_MUTEX(isa_mutex);
-
-/*
- * 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)
-{
- int ret;
-
- mutex_lock(&isa_mutex);
-
- if (mempool_initialized(&isa_page_pool)) {
- mutex_unlock(&isa_mutex);
- return 0;
- }
-
- ret = mempool_init(&isa_page_pool, ISA_POOL_SIZE, mempool_alloc_pages_isa,
- mempool_free_pages, (void *) 0);
- BUG_ON(ret);
-
- pr_info("isa pool size: %d pages\n", ISA_POOL_SIZE);
- init_bounce_bioset();
- mutex_unlock(&isa_mutex);
- return 0;
-}
-
/*
* 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
}
}
-static void bounce_end_io(struct bio *bio, mempool_t *pool)
+static void bounce_end_io(struct bio *bio)
{
struct bio *bio_orig = bio->bi_private;
struct bio_vec *bvec, orig_vec;
orig_vec = bio_iter_iovec(bio_orig, orig_iter);
if (bvec->bv_page != orig_vec.bv_page) {
dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
- mempool_free(bvec->bv_page, pool);
+ mempool_free(bvec->bv_page, &page_pool);
}
bio_advance_iter(bio_orig, &orig_iter, orig_vec.bv_len);
}
static void bounce_end_io_write(struct bio *bio)
{
- bounce_end_io(bio, &page_pool);
-}
-
-static void bounce_end_io_write_isa(struct bio *bio)
-{
-
- bounce_end_io(bio, &isa_page_pool);
+ bounce_end_io(bio);
}
-static void __bounce_end_io_read(struct bio *bio, mempool_t *pool)
+static void bounce_end_io_read(struct bio *bio)
{
struct bio *bio_orig = bio->bi_private;
if (!bio->bi_status)
copy_to_high_bio_irq(bio_orig, bio);
- bounce_end_io(bio, pool);
-}
-
-static void bounce_end_io_read(struct bio *bio)
-{
- __bounce_end_io_read(bio, &page_pool);
-}
-
-static void bounce_end_io_read_isa(struct bio *bio)
-{
- __bounce_end_io_read(bio, &isa_page_pool);
+ bounce_end_io(bio);
}
static struct bio *bounce_clone_bio(struct bio *bio_src)
return NULL;
}
-static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
- mempool_t *pool)
+
+void blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
{
struct bio *bio;
int rw = bio_data_dir(*bio_orig);
bool bounce = false;
int sectors = 0;
+ /*
+ * Data-less bio, nothing to bounce
+ */
+ if (!bio_has_data(*bio_orig))
+ return;
+
+ /*
+ * 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->limits.bounce_pfn >= blk_max_pfn)
+ return;
+
bio_for_each_segment(from, *bio_orig, iter) {
if (i++ < BIO_MAX_VECS)
sectors += from.bv_len >> 9;
if (page_to_pfn(page) <= q->limits.bounce_pfn)
continue;
- to->bv_page = mempool_alloc(pool, q->bounce_gfp);
+ to->bv_page = mempool_alloc(&page_pool, GFP_NOIO);
inc_zone_page_state(to->bv_page, NR_BOUNCE);
if (rw == WRITE) {
bio->bi_flags |= (1 << BIO_BOUNCED);
- if (pool == &page_pool) {
+ if (rw == READ)
+ bio->bi_end_io = bounce_end_io_read;
+ else
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;
}
-
-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 (q->limits.bounce_pfn >= blk_max_pfn)
- return;
- pool = &page_pool;
- } else {
- BUG_ON(!mempool_initialized(&isa_page_pool));
- pool = &isa_page_pool;
- }
-
- /*
- * slow path
- */
- __blk_queue_bounce(q, bio_orig, pool);
-}