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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: Christoph Hellwig <hch@lst.de>
Acked-by: Kashyap Desai < kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-06-17 14:19:53 +02:00 committed by Martin K. Petersen
parent f9b0530fa0
commit 7ad388d8e4
3 changed files with 8 additions and 1 deletions
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3
drivers/scsi/hosts.c
View File

@ -462,6 +462,9 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
else else
shost->dma_boundary = 0xffffffff; shost->dma_boundary = 0xffffffff;
if (sht->virt_boundary_mask)
shost->virt_boundary_mask = sht->virt_boundary_mask;
device_initialize(&shost->shost_gendev); device_initialize(&shost->shost_gendev);
dev_set_name(&shost->shost_gendev, "host%d", shost->host_no); dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);
shost->shost_gendev.bus = &scsi_bus_type; shost->shost_gendev.bus = &scsi_bus_type;

3
drivers/scsi/scsi_lib.c
View File

@ -1791,7 +1791,8 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
dma_set_seg_boundary(dev, shost->dma_boundary); dma_set_seg_boundary(dev, shost->dma_boundary);
blk_queue_max_segment_size(q, shost->max_segment_size); 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), * Set a reasonable default alignment: The larger of 32-byte (dword),

3
include/scsi/scsi_host.h
View File

@ -369,6 +369,8 @@ struct scsi_host_template {
*/ */
unsigned long dma_boundary; unsigned long dma_boundary;
unsigned long virt_boundary_mask;
/* /*
* This specifies "machine infinity" for host templates which don't * This specifies "machine infinity" for host templates which don't
* limit the transfer size. Note this limit represents an absolute * limit the transfer size. Note this limit represents an absolute
@ -587,6 +589,7 @@ struct Scsi_Host {
unsigned int max_sectors; unsigned int max_sectors;
unsigned int max_segment_size; unsigned int max_segment_size;
unsigned long dma_boundary; unsigned long dma_boundary;
unsigned long virt_boundary_mask;
/* /*
* In scsi-mq mode, the number of hardware queues supported by the LLD. * In scsi-mq mode, the number of hardware queues supported by the LLD.
* *