izumi.taku at jp
Jun 19, 2008, 7:57 PM
Post #1 of 3
(318 views)
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[PATCH 2/3] e1000e: make ioport free
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This patch makes e1000e 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 [at] jp>
---
drivers/net/e1000e/e1000.h | 4 +++
drivers/net/e1000e/netdev.c | 48 ++++++++++++++++++++++++++++++++++++++------
2 files changed, 46 insertions(+), 6 deletions(-)
Index: linux-2.6.25.7/drivers/net/e1000e/e1000.h
===================================================================
--- linux-2.6.25.7.orig/drivers/net/e1000e/e1000.h
+++ linux-2.6.25.7/drivers/net/e1000e/e1000.h
@@ -266,6 +266,10 @@ struct e1000_adapter {
unsigned long led_status;
unsigned int flags;
+
+ /* for ioport free */
+ int bars;
+ int need_ioport;
};
struct e1000_info {
Index: linux-2.6.25.7/drivers/net/e1000e/netdev.c
===================================================================
--- linux-2.6.25.7.orig/drivers/net/e1000e/netdev.c
+++ linux-2.6.25.7/drivers/net/e1000e/netdev.c
@@ -3523,7 +3523,11 @@ static int e1000_resume(struct pci_dev *
pci_set_power_state(pdev, PCI_D0);
pci_restore_state(pdev);
e1000e_disable_l1aspm(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,
"Cannot enable PCI device from suspend\n");
@@ -3622,9 +3626,14 @@ static pci_ers_result_t e1000_io_slot_re
struct net_device *netdev = pci_get_drvdata(pdev);
struct e1000_adapter *adapter = netdev_priv(netdev);
struct e1000_hw *hw = &adapter->hw;
+ int err;
e1000e_disable_l1aspm(pdev);
- 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;
@@ -3700,6 +3709,21 @@ static void e1000_print_device_info(stru
}
/**
+ * e1000e_is_need_ioport - determine if an adapter needs ioport resources or not
+ * @pdev: PCI device information struct
+ *
+ * Returns true if an adapters needs ioport resources
+ **/
+static int e1000e_is_need_ioport(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ /* Currently there are no adapters that need ioport resources */
+ default:
+ return false;
+ }
+}
+
+/**
* e1000_probe - Device Initialization Routine
* @pdev: PCI device information struct
* @ent: entry in e1000_pci_tbl
@@ -3724,9 +3748,19 @@ static int __devinit e1000_probe(struct
int i, err, pci_using_dac;
u16 eeprom_data = 0;
u16 eeprom_apme_mask = E1000_EEPROM_APME;
+ int bars, need_ioport;
e1000e_disable_l1aspm(pdev);
- err = pci_enable_device(pdev);
+
+ /* do not allocate ioport bars when not needed */
+ need_ioport = e1000e_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;
@@ -3749,7 +3783,7 @@ static int __devinit e1000_probe(struct
}
}
- err = pci_request_regions(pdev, e1000e_driver_name);
+ err = pci_request_selected_regions(pdev, bars, e1000e_driver_name);
if (err)
goto err_pci_reg;
@@ -3773,6 +3807,8 @@ static int __devinit e1000_probe(struct
adapter->hw.adapter = adapter;
adapter->hw.mac.type = ei->mac;
adapter->msg_enable = (1 << NETIF_MSG_DRV | NETIF_MSG_PROBE) - 1;
+ adapter->bars = bars;
+ adapter->need_ioport = need_ioport;
mmio_start = pci_resource_start(pdev, 0);
mmio_len = pci_resource_len(pdev, 0);
@@ -4001,7 +4037,7 @@ err_sw_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);
@@ -4045,7 +4081,7 @@ static void __devexit e1000_remove(struc
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);
--
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