igb: make ioport free
Taku Izumi [Fri, 20 Jun 2008 03:10:30 +0000 (12:10 +0900)]
This patch makes igb driver ioport-free.
This corrects behavior in probe function so as not to request ioport
resources as long as they are not really needed.

Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/igb/igb.h
drivers/net/igb/igb_main.c

index 6b2e7d3..0eecb8b 100644 (file)
@@ -271,6 +271,10 @@ struct igb_adapter {
        unsigned int msi_enabled;
 
        u32 eeprom_wol;
+
+       /* for ioport free */
+       int bars;
+       int need_ioport;
 };
 
 enum e1000_state_t {
index 7b6b780..e13b8db 100644 (file)
@@ -820,6 +820,21 @@ void igb_reset(struct igb_adapter *adapter)
 }
 
 /**
+ * igb_is_need_ioport - determine if an adapter needs ioport resources or not
+ * @pdev: PCI device information struct
+ *
+ * Returns true if an adapter needs ioport resources
+ **/
+static int igb_is_need_ioport(struct pci_dev *pdev)
+{
+       switch (pdev->device) {
+       /* Currently there are no adapters that need ioport resources */
+       default:
+               return false;
+       }
+}
+
+/**
  * igb_probe - Device Initialization Routine
  * @pdev: PCI device information struct
  * @ent: entry in igb_pci_tbl
@@ -843,8 +858,17 @@ static int __devinit igb_probe(struct pci_dev *pdev,
        u16 eeprom_data = 0;
        u16 eeprom_apme_mask = IGB_EEPROM_APME;
        u32 part_num;
+       int bars, need_ioport;
 
-       err = pci_enable_device(pdev);
+       /* do not allocate ioport bars when not needed */
+       need_ioport = igb_is_need_ioport(pdev);
+       if (need_ioport) {
+               bars = pci_select_bars(pdev, IORESOURCE_MEM | IORESOURCE_IO);
+               err = pci_enable_device(pdev);
+       } else {
+               bars = pci_select_bars(pdev, IORESOURCE_MEM);
+               err = pci_enable_device_mem(pdev);
+       }
        if (err)
                return err;
 
@@ -866,7 +890,7 @@ static int __devinit igb_probe(struct pci_dev *pdev,
                }
        }
 
-       err = pci_request_regions(pdev, igb_driver_name);
+       err = pci_request_selected_regions(pdev, bars, igb_driver_name);
        if (err)
                goto err_pci_reg;
 
@@ -887,6 +911,8 @@ static int __devinit igb_probe(struct pci_dev *pdev,
        hw = &adapter->hw;
        hw->back = adapter;
        adapter->msg_enable = NETIF_MSG_DRV | NETIF_MSG_PROBE;
+       adapter->bars = bars;
+       adapter->need_ioport = need_ioport;
 
        mmio_start = pci_resource_start(pdev, 0);
        mmio_len = pci_resource_len(pdev, 0);
@@ -1127,7 +1153,7 @@ err_hw_init:
 err_ioremap:
        free_netdev(netdev);
 err_alloc_etherdev:
-       pci_release_regions(pdev);
+       pci_release_selected_regions(pdev, bars);
 err_pci_reg:
 err_dma:
        pci_disable_device(pdev);
@@ -1174,7 +1200,7 @@ static void __devexit igb_remove(struct pci_dev *pdev)
        iounmap(adapter->hw.hw_addr);
        if (adapter->hw.flash_address)
                iounmap(adapter->hw.flash_address);
-       pci_release_regions(pdev);
+       pci_release_selected_regions(pdev, adapter->bars);
 
        free_netdev(netdev);
 
@@ -3975,7 +4001,11 @@ static int igb_resume(struct pci_dev *pdev)
 
        pci_set_power_state(pdev, PCI_D0);
        pci_restore_state(pdev);
-       err = pci_enable_device(pdev);
+
+       if (adapter->need_ioport)
+               err = pci_enable_device(pdev);
+       else
+               err = pci_enable_device_mem(pdev);
        if (err) {
                dev_err(&pdev->dev,
                        "igb: Cannot enable PCI device from suspend\n");
@@ -4078,8 +4108,13 @@ static pci_ers_result_t igb_io_slot_reset(struct pci_dev *pdev)
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct igb_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
+       int err;
 
-       if (pci_enable_device(pdev)) {
+       if (adapter->need_ioport)
+               err = pci_enable_device(pdev);
+       else
+               err = pci_enable_device_mem(pdev);
+       if (err) {
                dev_err(&pdev->dev,
                        "Cannot re-enable PCI device after reset.\n");
                return PCI_ERS_RESULT_DISCONNECT;