[SCSI] megaraid_sas: Use lowest memory bar for SR-IOV VF support

The following patch modifies the megaraid_sas driver to select the
lowest memory bar available so the driver will work in SR-IOV VF
environments where the memory bar mapping changes.

Signed-off-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 11 insertions, 19 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index ff9845c72a67..0e09a0ff479d 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -1338,6 +1338,7 @@ struct megasas_instance {
 
         u8      msi_flag;
         struct msix_entry msixentry;
+        unsigned long bar;
 };
 
 enum {
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 2318183f9a67..6e7bb7ca9869 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -3236,21 +3236,14 @@ static int megasas_init_mfi(struct megasas_instance *instance)
         u32 tmp_sectors;
         struct megasas_register_set __iomem *reg_set;
         struct megasas_ctrl_info *ctrl_info;
-        /*
-         * Map the message registers
-         */
-        if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS1078GEN2) ||
-                (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY) ||
-                (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
-                (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0079GEN2)) {
-                instance->base_addr = pci_resource_start(instance->pdev, 1);
-        } else {
-                instance->base_addr = pci_resource_start(instance->pdev, 0);
-        }
-
-        if (pci_request_selected_regions(instance->pdev,
-                pci_select_bars(instance->pdev, IORESOURCE_MEM),
-                "megasas: LSI")) {
+        unsigned long bar_list;
+
+        /* Find first memory bar */
+        bar_list = pci_select_bars(instance->pdev, IORESOURCE_MEM);
+        instance->bar = find_first_bit(&bar_list, sizeof(unsigned long));
+        instance->base_addr = pci_resource_start(instance->pdev, instance->bar);
+        if (pci_request_selected_regions(instance->pdev, instance->bar,
+                                         "megasas: LSI")) {
                 printk(KERN_DEBUG "megasas: IO memory region busy!\n");
                 return -EBUSY;
         }
@@ -3411,8 +3404,7 @@ static int megasas_init_mfi(struct megasas_instance *instance)
         iounmap(instance->reg_set);
 
       fail_ioremap:
-        pci_release_selected_regions(instance->pdev,
-                pci_select_bars(instance->pdev, IORESOURCE_MEM));
+        pci_release_selected_regions(instance->pdev, instance->bar);
 
         return -EINVAL;
 }
@@ -3432,8 +3424,7 @@ static void megasas_release_mfi(struct megasas_instance *instance)
 
         iounmap(instance->reg_set);
 
-        pci_release_selected_regions(instance->pdev,
-                pci_select_bars(instance->pdev, IORESOURCE_MEM));
+        pci_release_selected_regions(instance->pdev, instance->bar);
 }
 
 /**