AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

scsi: megaraid_sas: set an unlimited max_segment_size

Browse Source 
When using a virt_boundary_mask, as done for NVMe devices attached to
megaraid_sas controllers, we require an unlimited max_segment_size as the
virt boundary merging code assumes that.  But we also need to propagate
that to the DMA mapping layer to make dma-debug happy.  The SCSI layer
takes care of that when using the per-host virt_boundary setting, but
given that megaraid_sas only wants to set the virt_boundary for actual
NVMe devices, we can't rely on that.  The DMA layer maximum segment is
global to the HBA however, so we have to set it explicitly.  This patch
assumes that megaraid_sas does not have a segment size limitation, which
seems true based on the SGL format, but will need to be verified.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-06-17 14:20:00 +02:00 committed by Martin K. Petersen
parent ce0ad85310
commit 07d9aa1434
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/scsi/megaraid/megaraid_sas_base.c
View File

@ -3356,6 +3356,7 @@ static struct scsi_host_template megasas_template = {
.shost_attrs = megaraid_host_attrs, .shost_attrs = megaraid_host_attrs,
.bios_param = megasas_bios_param, .bios_param = megasas_bios_param,
.change_queue_depth = scsi_change_queue_depth, .change_queue_depth = scsi_change_queue_depth,
.max_segment_size = 0xffffffff,
.no_write_same = 1, .no_write_same = 1,
}; };