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[SCSI] megaraid_sas: Add module param for configurable MSI-X vector count 

Signed-off-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
adam radford 2012-10-01 19:26:59 -07:00 committed by James Bottomley
parent 58af7b884f
commit 079eaddf2e
1 changed files with 8 additions and 0 deletions
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8
drivers/scsi/megaraid/megaraid_sas_base.c
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@ -71,6 +71,10 @@ static int msix_disable;
module_param(msix_disable, int, S_IRUGO);
MODULE_PARM_DESC(msix_disable, "Disable MSI-X interrupt handling. Default: 0");
static unsigned int msix_vectors;
module_param(msix_vectors, int, S_IRUGO);
MODULE_PARM_DESC(msix_vectors, "MSI-X max vector count. Default: Set by FW");
static int throttlequeuedepth = MEGASAS_THROTTLE_QUEUE_DEPTH;
module_param(throttlequeuedepth, int, S_IRUGO);
MODULE_PARM_DESC(throttlequeuedepth,
@ -3520,6 +3524,10 @@ static int megasas_init_fw(struct megasas_instance *instance)
instance->msix_vectors = (readl(&instance->reg_set->
outbound_scratch_pad_2
) & 0x1F) + 1;
if (msix_vectors)
instance->msix_vectors =
min(msix_vectors,
instance->msix_vectors);
} else
instance->msix_vectors = 1;
/* Don't bother allocating more MSI-X vectors than cpus */