[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>

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 0393ec4..427a658 100644 (file)
--- 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 */