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block: add a bvec_phys helper

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Get callers out of poking into bvec internals a bit more.  Not a huge win
right now, but with the proposed new DMA mapping API we might end up with
a lot more of this otherwise.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20240706075228.2350978-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-07-06 09:52:17 +02:00 committed by Jens Axboe
parent bf86bcdb40
commit 25f76c3db2
4 changed files with 18 additions and 4 deletions
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2
arch/m68k/emu/nfblock.c
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@ -71,7 +71,7 @@ static void nfhd_submit_bio(struct bio *bio)
len = bvec.bv_len;
len >>= 9;
nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift,
page_to_phys(bvec.bv_page) + bvec.bv_offset);
bvec_phys(&bvec));
sec += len;
}
bio_endio(bio);

2
block/bio.c
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@ -953,7 +953,7 @@ bool bvec_try_merge_hw_page(struct request_queue *q, struct bio_vec *bv,
bool *same_page)
{
unsigned long mask = queue_segment_boundary(q);
phys_addr_t addr1 = page_to_phys(bv->bv_page) + bv->bv_offset;
phys_addr_t addr1 = bvec_phys(bv);
phys_addr_t addr2 = page_to_phys(page) + offset + len - 1;
if ((addr1 | mask) != (addr2 | mask))

4
block/blk.h
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@ -98,8 +98,8 @@ static inline bool biovec_phys_mergeable(struct request_queue *q,
struct bio_vec *vec1, struct bio_vec *vec2)
{
unsigned long mask = queue_segment_boundary(q);
phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
phys_addr_t addr1 = bvec_phys(vec1);
phys_addr_t addr2 = bvec_phys(vec2);
/*
* Merging adjacent physical pages may not work correctly under KMSAN

14
include/linux/bvec.h
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@ -280,4 +280,18 @@ static inline void *bvec_virt(struct bio_vec *bvec)
return page_address(bvec->bv_page) + bvec->bv_offset;
}
/**
* bvec_phys - return the physical address for a bvec
* @bvec: bvec to return the physical address for
*/
static inline phys_addr_t bvec_phys(const struct bio_vec *bvec)
{
/*
* Note this open codes page_to_phys because page_to_phys is defined in
* <asm/io.h>, which we don't want to pull in here. If it ever moves to
* a sensible place we should start using it.
*/
return PFN_PHYS(page_to_pfn(bvec->bv_page)) + bvec->bv_offset;
}
#endif /* __LINUX_BVEC_H */