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block: remove BLK_BOUNCE_ISA support 

Remove the BLK_BOUNCE_ISA support now that all users are gone.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20210331073001.46776-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-03-31 09:29:59 +02:00 committed by Jens Axboe
parent aaff5ebaa2
commit ce288e0535
9 changed files with 35 additions and 133 deletions
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3
block/bio-integrity.c
View File

@ -204,7 +204,6 @@ bool bio_integrity_prep(struct bio *bio)
{
struct bio_integrity_payload *bip;
struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
struct request_queue *q = bio->bi_bdev->bd_disk->queue;
void *buf;
unsigned long start, end;
unsigned int len, nr_pages;
@ -238,7 +237,7 @@ bool bio_integrity_prep(struct bio *bio)
/* Allocate kernel buffer for protection data */
len = intervals * bi->tuple_size;
buf = kmalloc(len, GFP_NOIO | q->bounce_gfp);
buf = kmalloc(len, GFP_NOIO);
status = BLK_STS_RESOURCE;
if (unlikely(buf == NULL)) {
printk(KERN_ERR "could not allocate integrity buffer\n");

4
block/blk-map.c
View File

@ -181,7 +181,7 @@ static int bio_copy_user_iov(struct request *rq, struct rq_map_data *map_data,
i++;
} else {
page = alloc_page(rq->q->bounce_gfp | gfp_mask);
page = alloc_page(GFP_NOIO | gfp_mask);
if (!page) {
ret = -ENOMEM;
goto cleanup;
@ -486,7 +486,7 @@ static struct bio *bio_copy_kern(struct request_queue *q, void *data,
if (bytes > len)
bytes = len;
page = alloc_page(q->bounce_gfp | gfp_mask);
page = alloc_page(GFP_NOIO | gfp_mask);
if (!page)
goto cleanup;

11
block/blk-settings.c
View File

@ -103,28 +103,17 @@ EXPORT_SYMBOL(blk_set_stacking_limits);
void blk_queue_bounce_limit(struct request_queue *q, u64 max_addr)
{
unsigned long b_pfn = max_addr >> PAGE_SHIFT;
int dma = 0;
q->bounce_gfp = GFP_NOIO;
#if BITS_PER_LONG == 64
/*
* Assume anything <= 4GB can be handled by IOMMU. Actually
* some IOMMUs can handle everything, but I don't know of a
* way to test this here.
*/
if (b_pfn < (min_t(u64, 0xffffffffUL, BLK_BOUNCE_HIGH) >> PAGE_SHIFT))
dma = 1;
q->limits.bounce_pfn = max(max_low_pfn, b_pfn);
#else
if (b_pfn < blk_max_low_pfn)
dma = 1;
q->limits.bounce_pfn = b_pfn;
#endif
if (dma) {
init_emergency_isa_pool();
q->bounce_gfp = GFP_NOIO | GFP_DMA;
q->limits.bounce_pfn = b_pfn;
}
}
EXPORT_SYMBOL(blk_queue_bounce_limit);

5
block/blk.h
View File

@ -312,13 +312,8 @@ static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
#endif
#ifdef CONFIG_BOUNCE
extern int init_emergency_isa_pool(void);
extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
#else
static inline int init_emergency_isa_pool(void)
{
return 0;
}
static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
{
}

124
block/bounce.c
View File

@ -29,7 +29,7 @@
#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)
{
@ -89,41 +89,6 @@ static void bounce_copy_vec(struct bio_vec *to, unsigned char *vfrom)
#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
@ -159,7 +124,7 @@ static void copy_to_high_bio_irq(struct bio *to, struct bio *from)
}
}
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;
@ -173,7 +138,7 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool)
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);
}
@ -185,33 +150,17 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool)
static void bounce_end_io_write(struct bio *bio)
{
bounce_end_io(bio, &page_pool);
bounce_end_io(bio);
}
static void bounce_end_io_write_isa(struct bio *bio)
{
bounce_end_io(bio, &isa_page_pool);
}
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)
@ -287,8 +236,8 @@ err_put:
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);
@ -298,6 +247,20 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **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;
@ -327,7 +290,7 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
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) {
@ -346,46 +309,11 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
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);
}

2
block/scsi_ioctl.c
View File

@ -431,7 +431,7 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
bytes = max(in_len, out_len);
if (bytes) {
buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
buffer = kzalloc(bytes, GFP_NOIO | GFP_USER | __GFP_NOWARN);
if (!buffer)
return -ENOMEM;

3
drivers/ata/libata-scsi.c
View File

@ -1043,8 +1043,7 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
blk_queue_max_segments(q, queue_max_segments(q) - 1);
sdev->dma_drain_len = ATAPI_MAX_DRAIN;
sdev->dma_drain_buf = kmalloc(sdev->dma_drain_len,
q->bounce_gfp | GFP_KERNEL);
sdev->dma_drain_buf = kmalloc(sdev->dma_drain_len, GFP_NOIO);
if (!sdev->dma_drain_buf) {
ata_dev_err(dev, "drain buffer allocation failed\n");
return -ENOMEM;

7
include/linux/blkdev.h
View File

@ -436,11 +436,6 @@ struct request_queue {
*/
int id;
/*
* queue needs bounce pages for pages above this limit
*/
gfp_t bounce_gfp;
spinlock_t queue_lock;
/*
@ -847,7 +842,6 @@ extern unsigned long blk_max_low_pfn, blk_max_pfn;
*
* BLK_BOUNCE_HIGH : bounce all highmem pages
* BLK_BOUNCE_ANY : don't bounce anything
* BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
*/
#if BITS_PER_LONG == 32
@ -856,7 +850,6 @@ extern unsigned long blk_max_low_pfn, blk_max_pfn;
#define BLK_BOUNCE_HIGH -1ULL
#endif
#define BLK_BOUNCE_ANY (-1ULL)
#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
/*
* default timeout for SG_IO if none specified

9
mm/Kconfig
View File

@ -283,12 +283,11 @@ config PHYS_ADDR_T_64BIT
config BOUNCE
bool "Enable bounce buffers"
default y
depends on BLOCK && MMU && (ZONE_DMA || HIGHMEM)
depends on BLOCK && MMU && HIGHMEM
help
Enable bounce buffers for devices that cannot access
the full range of memory available to the CPU. Enabled
by default when ZONE_DMA or HIGHMEM is selected, but you
may say n to override this.
Enable bounce buffers for devices that cannot access the full range of
memory available to the CPU. Enabled by default when HIGHMEM is
selected, but you may say n to override this.
config VIRT_TO_BUS
bool