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authoradam radford <aradford@gmail.com>2012-10-02 06:26:59 +0400
committerJames Bottomley <JBottomley@Parallels.com>2012-10-09 14:12:30 +0400
commit079eaddf2e5cd903565caf5118ff4907df8bad29 (patch)
tree436adfe6f08cea086acf5eb6870b935688bad880 /drivers/scsi
parent58af7b884fb17bf24fd8effeb6377a2aaaf13d62 (diff)
downloadlinux-079eaddf2e5cd903565caf5118ff4907df8bad29.tar.xz
[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>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/megaraid/megaraid_sas_base.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 0393ec478cdf..427a658d44ab 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -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 */