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authorEric Farman <farman@linux.ibm.com>2022-08-05 00:39:26 +0300
committerJens Axboe <axboe@kernel.dk>2022-08-05 01:19:15 +0300
commitbc792884b76f0da2f5c9a8d720e430e2de9756f5 (patch)
tree667c8e0309f378062702eedf204820889bed0382 /drivers/s390
parentbcee43dc6d5bd6f54e5e2a5d696bf8c8f4c141dd (diff)
downloadlinux-bc792884b76f0da2f5c9a8d720e430e2de9756f5.tar.xz
s390/dasd: Establish DMA alignment
linux-next commit bf8d08532bc1 ("iomap: add support for dma aligned direct-io") changes the alignment requirement to come from the block device rather than the block size, and the default alignment requirement is 512-byte boundaries. Since DASD I/O has page alignments for IDAW/TIDAW requests, let's override this value to restore the expected behavior. Make this change for both ECKD and DIAG disciplines, as they both would fall into this category. Leave FBA alone, since it is always comprised of 512-byte blocks. Signed-off-by: Eric Farman <farman@linux.ibm.com> Acked-by: Halil Pasic <pasic@linux.ibm.com> Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Link: https://lore.kernel.org/r/20220804213926.3361574-3-sth@linux.ibm.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/block/dasd_diag.c1
-rw-r--r--drivers/s390/block/dasd_eckd.c1
2 files changed, 2 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index e9edf3b6ed7c..94ee59864971 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -639,6 +639,7 @@ static void dasd_diag_setup_blk_queue(struct dasd_block *block)
/* With page sized segments each segment can be translated into one idaw/tidaw */
blk_queue_max_segment_size(q, PAGE_SIZE);
blk_queue_segment_boundary(q, PAGE_SIZE - 1);
+ blk_queue_dma_alignment(q, PAGE_SIZE - 1);
}
static int dasd_diag_pe_handler(struct dasd_device *device,
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 836838f7d686..3cc93e2e4e15 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -6626,6 +6626,7 @@ static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
/* With page sized segments each segment can be translated into one idaw/tidaw */
blk_queue_max_segment_size(q, PAGE_SIZE);
blk_queue_segment_boundary(q, PAGE_SIZE - 1);
+ blk_queue_dma_alignment(q, PAGE_SIZE - 1);
}
static struct ccw_driver dasd_eckd_driver = {