From patchwork Tue Mar 22 19:48:44 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naga Chumbalkar X-Patchwork-Id: 87955 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id B77991007D1 for ; Wed, 23 Mar 2011 06:48:50 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754657Ab1CVTsq (ORCPT ); Tue, 22 Mar 2011 15:48:46 -0400 Received: from g1t0029.austin.hp.com ([15.216.28.36]:26231 "EHLO g1t0029.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753378Ab1CVTsp (ORCPT ); Tue, 22 Mar 2011 15:48:45 -0400 Received: from g1t0039.austin.hp.com (g1t0039.austin.hp.com [16.236.32.45]) by g1t0029.austin.hp.com (Postfix) with ESMTP id E02C2387C2; Tue, 22 Mar 2011 19:48:44 +0000 (UTC) Received: from nchumbalkar.americas.hpqcorp.net (unknown [16.84.209.17]) by g1t0039.austin.hp.com (Postfix) with ESMTP id 918833405F; Tue, 22 Mar 2011 19:48:44 +0000 (UTC) From: Naga Chumbalkar To: davem@davemloft.net Cc: netdev@vger.kernel.org, Naga Chumbalkar , bruce.w.allan@intel.com Message-Id: <20110322194437.3043.97757.sendpatchset@nchumbalkar.americas.hpqcorp.net> Subject: [RFC][PATCH]: e1000e: If ASPM L0s needs to be disabled, do it prior to enabling device Date: Tue, 22 Mar 2011 19:48:44 +0000 (UTC) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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 Cc: Bruce Allan --- 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)