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

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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>
This commit is contained in:
Bruce Allan 2011-03-24 03:09:03 +00:00 committed by Jeff Kirsher
parent 2084b114e3
commit 78cd29d5a9
3 changed files with 30 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/e1000e/82571.c
View File

@ -431,9 +431,6 @@ static s32 e1000_get_variants_82571(struct e1000_adapter *adapter)
case e1000_82573:
case e1000_82574:
case e1000_82583:
/* Disable ASPM L0s due to hardware errata */
e1000e_disable_aspm(adapter->pdev, PCIE_LINK_STATE_L0S);
if (pdev->device == E1000_DEV_ID_82573L) {
adapter->flags |= FLAG_HAS_JUMBO_FRAMES;
adapter->max_hw_frame_size = DEFAULT_JUMBO;
@ -2066,7 +2063,8 @@ struct e1000_info e1000_82573_info = {
| FLAG_HAS_SMART_POWER_DOWN
| FLAG_HAS_AMT
| FLAG_HAS_SWSM_ON_LOAD,
.flags2 = FLAG2_DISABLE_ASPM_L1,
.flags2 = FLAG2_DISABLE_ASPM_L1
| FLAG2_DISABLE_ASPM_L0S,
.pba = 20,
.max_hw_frame_size = ETH_FRAME_LEN + ETH_FCS_LEN,
.get_variants = e1000_get_variants_82571,
@ -2086,7 +2084,8 @@ struct e1000_info e1000_82574_info = {
| FLAG_HAS_SMART_POWER_DOWN
| FLAG_HAS_AMT
| FLAG_HAS_CTRLEXT_ON_LOAD,
.flags2 = FLAG2_CHECK_PHY_HANG,
.flags2 = FLAG2_CHECK_PHY_HANG
| FLAG2_DISABLE_ASPM_L0S,
.pba = 32,
.max_hw_frame_size = DEFAULT_JUMBO,
.get_variants = e1000_get_variants_82571,
@ -2104,6 +2103,7 @@ struct e1000_info e1000_82583_info = {
| FLAG_HAS_SMART_POWER_DOWN
| FLAG_HAS_AMT
| FLAG_HAS_CTRLEXT_ON_LOAD,
.flags2 = FLAG2_DISABLE_ASPM_L0S,
.pba = 32,
.max_hw_frame_size = ETH_FRAME_LEN + ETH_FCS_LEN,
.get_variants = e1000_get_variants_82571,

2
drivers/net/e1000e/e1000.h
View File

@ -458,6 +458,7 @@ struct e1000_info {
#define FLAG2_HAS_PHY_STATS (1 << 4)
#define FLAG2_HAS_EEE (1 << 5)
#define FLAG2_DMA_BURST (1 << 6)
#define FLAG2_DISABLE_ASPM_L0S (1 << 7)
#define FLAG2_DISABLE_AIM (1 << 8)
#define FLAG2_CHECK_PHY_HANG (1 << 9)
@ -504,7 +505,6 @@ extern void e1000e_set_interrupt_capability(struct e1000_adapter *adapter);
extern void e1000e_reset_interrupt_capability(struct e1000_adapter *adapter);
extern void e1000e_get_hw_control(struct e1000_adapter *adapter);
extern void e1000e_release_hw_control(struct e1000_adapter *adapter);
extern void e1000e_disable_aspm(struct pci_dev *pdev, u16 state);
extern unsigned int copybreak;

29
drivers/net/e1000e/netdev.c
View File

@ -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)