Commit 7ad388d8 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Martin K. Petersen
Browse files

scsi: core: add a host / host template field for the virt boundary 



This allows drivers setting it up easily instead of branching out to block
layer calls in slave_alloc, and ensures the upgraded max_segment_size
setting gets picked up by the DMA layer.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarKashyap Desai &lt; <kashyap.desai@broadcom.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent f9b0530f

drivers/scsi/hosts.c

+3 −0
Original line number Diff line number Diff line
@@ -462,6 +462,9 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) 
	else

		shost->dma_boundary = 0xffffffff;



	if (sht->virt_boundary_mask)

		shost->virt_boundary_mask = sht->virt_boundary_mask;



	device_initialize(&shost->shost_gendev);

	dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);

	shost->shost_gendev.bus = &scsi_bus_type;

drivers/scsi/scsi_lib.c

+2 −1
Original line number Diff line number Diff line
@@ -1791,7 +1791,8 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q) 
	dma_set_seg_boundary(dev, shost->dma_boundary);



	blk_queue_max_segment_size(q, shost->max_segment_size);

	dma_set_max_seg_size(dev, shost->max_segment_size);

	blk_queue_virt_boundary(q, shost->virt_boundary_mask);

	dma_set_max_seg_size(dev, queue_max_segment_size(q));



	/*

	 * Set a reasonable default alignment:  The larger of 32-byte (dword),

include/scsi/scsi_host.h

+3 −0
Original line number Diff line number Diff line
@@ -369,6 +369,8 @@ struct scsi_host_template { 
	 */

	unsigned long dma_boundary;



	unsigned long virt_boundary_mask;



	/*

	 * This specifies "machine infinity" for host templates which don't

	 * limit the transfer size.  Note this limit represents an absolute
@@ -587,6 +589,7 @@ struct Scsi_Host { 
	unsigned int max_sectors;

	unsigned int max_segment_size;

	unsigned long dma_boundary;

	unsigned long virt_boundary_mask;

	/*

	 * In scsi-mq mode, the number of hardware queues supported by the LLD.

	 *

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