[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>

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 */