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authorFUJITA Tomonori <tomof@acm.org>2008-02-04 22:28:17 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:12 -0800
commit99c84dbdc73d158a1ab955a4a5f74c18074796a3 (patch)
tree497fc8e86eca9b22a159c512e68ff8828a5e923b /drivers/scsi
parent681cc5cd3efbeafca6386114070e0bfb5012e249 (diff)
iommu sg merging: call dma_set_seg_boundary in __scsi_alloc_queue()
This is a one-line patch to add the following to __scsi_alloc_queue(): dma_set_seg_boundary(dev, shost->dma_boundary); This is the simplest approach but the result looks odd, __scsi_alloc_queue() does: blk_queue_segment_boundary(q, shost->dma_boundary); dma_set_seg_boundary(dev, shost->dma_boundary); blk_queue_max_segment_size(q, dma_get_max_seg_size(dev)); I think that it would be better to set up segment boundary in the same way as we did for the maximum segment size. That is, removing shost->dma_boundary and LLDs call pci_set_dma_seg_boundary (or its friends). Then __scsi_alloc_queue() can set up both limits in the same way: blk_queue_segment_boundary(q, dma_get_seg_boundary(dev)); blk_queue_max_segment_size(q, dma_get_max_seg_size(dev)); killing dma_boundary in scsi_host_template needs a large patch for libata (dma_boundary is used by only libata and sym53c8xx). I'll send a patch to do that if it is acceptable. James and Jeff? Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Greg KH <greg@kroah.com> Cc: Jeff Garzik <jeff@garzik.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/scsi_lib.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 68e424f09acb..f243fc30c908 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1584,6 +1584,7 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
blk_queue_max_sectors(q, shost->max_sectors);
blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost));
blk_queue_segment_boundary(q, shost->dma_boundary);
+ dma_set_seg_boundary(dev, shost->dma_boundary);
blk_queue_max_segment_size(q, dma_get_max_seg_size(dev));