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 <>
Acked-by: default avatarKashyap Desai &lt; <>
Signed-off-by: default avatarMartin K. Petersen <>
parent f9b0530f
......@@ -462,6 +462,9 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
shost->dma_boundary = 0xffffffff;
if (sht->virt_boundary_mask)
shost->virt_boundary_mask = sht->virt_boundary_mask;
dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);
shost->shost_gendev.bus = &scsi_bus_type;
......@@ -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),
......@@ -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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