[RFC][PATCH]: e1000e: If ASPM L0s needs to be disabled, do it prior to enabling device
From: Naga Chumbalkar <hidden>
Date: 2011-03-22 19:48:45
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". Signed-off-by: Naga Chumbalkar <redacted> Cc: Bruce Allan <redacted> --- drivers/net/e1000e/82571.c | 10 +++++----- drivers/net/e1000e/e1000.h | 1 + drivers/net/e1000e/netdev.c | 25 +++++++++++++++++++++---- 3 files changed, 27 insertions(+), 9 deletions(-)
diff --git a/drivers/net/e1000e/82571.c b/drivers/net/e1000e/82571.c
index 89a6903..5fddc94 100644
--- a/drivers/net/e1000e/82571.c
+++ b/drivers/net/e1000e/82571.c@@ -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,
diff --git a/drivers/net/e1000e/e1000.h b/drivers/net/e1000e/e1000.h
index 00bf595..ff224a7 100644
--- a/drivers/net/e1000e/e1000.h
+++ b/drivers/net/e1000e/e1000.h@@ -458,6 +458,7 @@ struct e1000_info { #define FLAG2_DMA_BURST (1 << 6) #define FLAG2_DISABLE_AIM (1 << 8) #define FLAG2_CHECK_PHY_HANG (1 << 9) +#define FLAG2_DISABLE_ASPM_L0S (1 << 10) #define E1000_RX_DESC_PS(R, i) \ (&(((union e1000_rx_desc_packet_split *)((R).desc))[i]))
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index a39d4a4..f60deec 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c@@ -5393,13 +5393,19 @@ 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; + static int aspm_disable_flag; 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)) {
@@ -5643,11 +5649,17 @@ 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; + static int aspm_disable_flag; 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,
@@ -5789,12 +5801,17 @@ static int __devinit e1000_probe(struct pci_dev *pdev, resource_size_t flash_start, flash_len; static int cards_found; + static int aspm_disable_flag; 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)
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1.7.1.2