e1000e: If ASPM L0s needs to be disabled, do it prior to enabling device

Based on a patch from Naga Chumbalkar <nagananda.chumbalkar@hp.com>:

If ASPM L0s needs to be disabled due to HW errata, do it prior to
"enabling" the device. This way if the kernel ever defaults its
aspm_policy to POLICY_POWERSAVE, then the e1000e driver will get a
chance to disable ASPM on the misbehaving device *prior* to calling
pci_enable_device_mem(). This will be useful in situations
where the BIOS indicates ASPM support on the server by clearing the
ACPI FADT "ASPM Controls" bit.

Note:
The kernel (2.6.38) currently uses the BIOS "default" as its aspm_policy.
However, Linux distros can diverge from that and set the default to
"powersave".

v2: o cleanup namespace pollution of e1000e_disable_aspm(),
    o fix type and initialization of the new aspm_disable_flag in a few
      functions, and
    o redefine FLAG2_DISABLE_ASPM_L0S to the first unused bit in
      adapter->flags2.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Cc: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 24 insertions, 5 deletions

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 8a3145e9aa3e..4deb67d98e36 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -58,6 +58,8 @@
 char e1000e_driver_name[] = "e1000e";
 const char e1000e_driver_version[] = DRV_VERSION;
 
+static void e1000e_disable_aspm(struct pci_dev *pdev, u16 state);
+
 static const struct e1000_info *e1000_info_tbl[] = {
         [board_82571]           = &e1000_82571_info,
         [board_82572]           = &e1000_82572_info,
@@ -5384,7 +5386,7 @@ static void __e1000e_disable_aspm(struct pci_dev *pdev, u16 state)
         pci_write_config_word(pdev->bus->self, pos + PCI_EXP_LNKCTL, reg16);
 }
 #endif
-void e1000e_disable_aspm(struct pci_dev *pdev, u16 state)
+static void e1000e_disable_aspm(struct pci_dev *pdev, u16 state)
 {
         dev_info(&pdev->dev, "Disabling ASPM %s %s\n",
                  (state & PCIE_LINK_STATE_L0S) ? "L0s" : "",
@@ -5404,13 +5406,19 @@ static int __e1000_resume(struct pci_dev *pdev)
         struct net_device *netdev = pci_get_drvdata(pdev);
         struct e1000_adapter *adapter = netdev_priv(netdev);
         struct e1000_hw *hw = &adapter->hw;
+        u16 aspm_disable_flag = 0;
         u32 err;
 
+        if (adapter->flags2 & FLAG2_DISABLE_ASPM_L0S)
+                aspm_disable_flag = PCIE_LINK_STATE_L0S;
+        if (adapter->flags2 & FLAG2_DISABLE_ASPM_L1)
+                aspm_disable_flag |= PCIE_LINK_STATE_L1;
+        if (aspm_disable_flag)
+                e1000e_disable_aspm(pdev, aspm_disable_flag);
+
         pci_set_power_state(pdev, PCI_D0);
         pci_restore_state(pdev);
         pci_save_state(pdev);
-        if (adapter->flags2 & FLAG2_DISABLE_ASPM_L1)
-                e1000e_disable_aspm(pdev, PCIE_LINK_STATE_L1);
 
         e1000e_set_interrupt_capability(adapter);
         if (netif_running(netdev)) {
@@ -5654,11 +5662,17 @@ static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev)
         struct net_device *netdev = pci_get_drvdata(pdev);
         struct e1000_adapter *adapter = netdev_priv(netdev);
         struct e1000_hw *hw = &adapter->hw;
+        u16 aspm_disable_flag = 0;
         int err;
         pci_ers_result_t result;
 
+        if (adapter->flags2 & FLAG2_DISABLE_ASPM_L0S)
+                aspm_disable_flag = PCIE_LINK_STATE_L0S;
         if (adapter->flags2 & FLAG2_DISABLE_ASPM_L1)
-                e1000e_disable_aspm(pdev, PCIE_LINK_STATE_L1);
+                aspm_disable_flag |= PCIE_LINK_STATE_L1;
+        if (aspm_disable_flag)
+                e1000e_disable_aspm(pdev, aspm_disable_flag);
+
         err = pci_enable_device_mem(pdev);
         if (err) {
                 dev_err(&pdev->dev,
@@ -5799,12 +5813,17 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
         resource_size_t flash_start, flash_len;
 
         static int cards_found;
+        u16 aspm_disable_flag = 0;
         int i, err, pci_using_dac;
         u16 eeprom_data = 0;
         u16 eeprom_apme_mask = E1000_EEPROM_APME;
 
+        if (ei->flags2 & FLAG2_DISABLE_ASPM_L0S)
+                aspm_disable_flag = PCIE_LINK_STATE_L0S;
         if (ei->flags2 & FLAG2_DISABLE_ASPM_L1)
-                e1000e_disable_aspm(pdev, PCIE_LINK_STATE_L1);
+                aspm_disable_flag |= PCIE_LINK_STATE_L1;
+        if (aspm_disable_flag)
+                e1000e_disable_aspm(pdev, aspm_disable_flag);
 
         err = pci_enable_device_mem(pdev);
         if (err)