[SCSI] megaraid_sas: make driver PCI legacy I/O port free driver

On the large servers, I/O port resource may not be assigned to all
the PCI devices since it is limited (to 64KB on Intel Architecture[1])
and it may also be fragmented (I/O base register of PCI-to-PCI bridge
will usually be aligned to a 4KB boundary[2]).
If no I/O port resource is assigned to devices, those devices do not
work.

[1] Some machines support 64KB I/O port space per PCI segment.
[2] Some P2P bridges support optional 1KB aligned I/O base.

Therefore, I made a patch for MegaRAID SAS driver to make PCI legacy
I/O port free.  I have also tested the patch and it had no problem.

The way to make PCI legacy I/O port free is the same as Fusion-MPT
driver's and it has been merged into 2.6.30.4.

This has already been fixed in e1000 and lpfc.

As a result of the above, the driver can handle its device even when
there are a huge number of PCI devices being used on the system and no
I/O port region assigned to the device.

Signed-off-by: Noriyuki Fujii <n-fujii@np.css.fujitsu.com>
Acked-by: "Yang, Bo" <Bo.Yang@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 134c63e..99ff99e 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -2501,7 +2501,9 @@ static int megasas_init_mfi(struct megasas_instance *instance)
                instance->base_addr = pci_resource_start(instance->pdev, 0);
        }
 
-       if (pci_request_regions(instance->pdev, "megasas: LSI")) {
+       if (pci_request_selected_regions(instance->pdev,
+               pci_select_bars(instance->pdev, IORESOURCE_MEM),
+               "megasas: LSI")) {
                printk(KERN_DEBUG "megasas: IO memory region busy!\n");
                return -EBUSY;
        }
@@ -2642,7 +2644,8 @@ static int megasas_init_mfi(struct megasas_instance *instance)
        iounmap(instance->reg_set);
 
       fail_ioremap:
-       pci_release_regions(instance->pdev);
+       pci_release_selected_regions(instance->pdev,
+               pci_select_bars(instance->pdev, IORESOURCE_MEM));
 
        return -EINVAL;
 }
@@ -2662,7 +2665,8 @@ static void megasas_release_mfi(struct megasas_instance *instance)
 
        iounmap(instance->reg_set);
 
-       pci_release_regions(instance->pdev);
+       pci_release_selected_regions(instance->pdev,
+               pci_select_bars(instance->pdev, IORESOURCE_MEM));
 }
 
 /**
@@ -2971,7 +2975,7 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
        /*
         * PCI prepping: enable device set bus mastering and dma mask
         */
-       rval = pci_enable_device(pdev);
+       rval = pci_enable_device_mem(pdev);
 
        if (rval) {
                return rval;
@@ -3276,7 +3280,7 @@ megasas_resume(struct pci_dev *pdev)
        /*
         * PCI prepping: enable device set bus mastering and dma mask
         */
-       rval = pci_enable_device(pdev);
+       rval = pci_enable_device_mem(pdev);
 
        if (rval) {
                printk(KERN_ERR "megasas: Enable device failed\n");