From patchwork Mon Jan 8 15:04:03 2001 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yanir Lubetkin X-Patchwork-Id: 459882 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from hemlock.osuosl.org (hemlock.osuosl.org [140.211.166.133]) by ozlabs.org (Postfix) with ESMTP id 3D8B9140281 for ; Fri, 10 Apr 2015 12:34:51 +1000 (AEST) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 46498955CF; Fri, 10 Apr 2015 02:34:50 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HIGv+0kKcX9c; Fri, 10 Apr 2015 02:34:49 +0000 (UTC) Received: from ash.osuosl.org (ash.osuosl.org [140.211.166.34]) by hemlock.osuosl.org (Postfix) with ESMTP id 88A79954DA; Fri, 10 Apr 2015 02:34:49 +0000 (UTC) X-Original-To: intel-wired-lan@lists.osuosl.org Delivered-To: intel-wired-lan@lists.osuosl.org Received: from fraxinus.osuosl.org (fraxinus.osuosl.org [140.211.166.137]) by ash.osuosl.org (Postfix) with ESMTP id 620A61C233E for ; Fri, 10 Apr 2015 02:34:48 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 5CD92A34BC for ; Fri, 10 Apr 2015 02:34:48 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yUfbddQrfnYB for ; Fri, 10 Apr 2015 02:34:47 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by fraxinus.osuosl.org (Postfix) with ESMTP id B0CBFA349A for ; Fri, 10 Apr 2015 02:34:47 +0000 (UTC) Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga103.fm.intel.com with ESMTP; 09 Apr 2015 19:34:47 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.11,554,1422950400"; d="scan'208";a="693208299" Received: from unknown (HELO ccdskly16.iil.intel.com) ([143.185.160.82]) by fmsmga001.fm.intel.com with ESMTP; 09 Apr 2015 19:34:46 -0700 From: Yanir Lubetkin To: intel-wired-lan@lists.osuosl.org Date: Mon, 8 Jan 2001 17:04:03 +0200 Message-Id: <978966243-11032-1-git-send-email-yanirx.lubetkin@intel.com> X-Mailer: git-send-email 2.1.0 Subject: [Intel-wired-lan] [PATCH] e1000e i219 fix unit hang on reset and runtime D3 X-BeenThere: intel-wired-lan@lists.osuosl.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-wired-lan-bounces@lists.osuosl.org Sender: "Intel-wired-lan" unit hang may occur if multiple descriptors are available in the rings during reset or runtime suspend. This state can be detected by testing the PCI config space register FEXTNVM7 bit 8 (0x100 mask). if this bit is on, and there are pending descriptors in one of the rings, we must flush them prior to reset. same goes for entering runtime suspend. Signed-off-by: Yanir Lubetkin --- drivers/net/ethernet/intel/e1000e/ich8lan.h | 2 + drivers/net/ethernet/intel/e1000e/netdev.c | 94 +++++++++++++++++++++++++++++ drivers/net/ethernet/intel/e1000e/regs.h | 1 + 3 files changed, 97 insertions(+) diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.h b/drivers/net/ethernet/intel/e1000e/ich8lan.h index 770a573..703f808 100644 --- a/drivers/net/ethernet/intel/e1000e/ich8lan.h +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.h @@ -101,6 +101,8 @@ #define E1000_FEXTNVM7_DISABLE_SMB_PERST 0x00000020 +#define E1000_FEXTNVM11_DISABLE_MULR_FIX 0x00002000 + #define K1_ENTRY_LATENCY 0 #define K1_MIN_TIME 1 #define NVM_SIZE_MULTIPLIER 4096 /*multiplier for NVMS field */ diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 4e56c31..46b5702 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -3788,6 +3788,98 @@ static void e1000_power_down_phy(struct e1000_adapter *adapter) } /** + * e1000_flush_tx_ring - remove all descriptors from the tx_ring + * + * force the hardware to read all the descriptors and discard them + * we put a descriptor with the ring itself as its data. reading + * the descripto contents is performing a read on all the ring entries and + * causes a ring flush + */ +static void e1000_flush_tx_ring(struct e1000_adapter *adapter) +{ + struct e1000_hw *hw = &adapter->hw; + struct e1000_ring *tx_ring = adapter->tx_ring; + struct e1000_tx_desc *tx_desc = NULL; + u32 txd_lower = E1000_TXD_CMD_IFCS; + u32 tctl, tdbal, tdbah; + int i; + u16 size = 512; + + tctl = er32(TCTL); + ew32(TCTL, tctl | E1000_TCTL_EN); + tdbal = er32(TDBAL(0)); + tdbah = er32(TDBAH(0)); + i = tx_ring->next_to_use; + tx_desc = E1000_TX_DESC(*tx_ring, i); + tx_desc->buffer_addr = cpu_to_le64(((u64)tdbah << 32) | tdbal); + tx_desc->lower.data = cpu_to_le32(txd_lower | size); + tx_desc->upper.data = 0; + /* in case other processors access the descriptor ring */ + wmb(); + i++; + if (i == tx_ring->count) + i = 0; + ew32(TDT(0), i); + mmiowb(); + usleep_range(200); +} + +/** + * e1000_flush_rx_ring - remove all descriptors from the tx_ring + * + * Mark all descriptors in the RX ring as consumed and disable the rx ring + */ +static void e1000_flush_rx_ring(struct e1000_adapter *adapter) +{ + u32 rctl, rxdctl; + struct e1000_hw *hw = &adapter->hw; + + rctl = er32(RCTL); + ew32(RCTL, rctl & ~E1000_RCTL_EN); + usleep_range(100); + rxdctl = er32(RXDCTL(0)); + rxdctl &= 0xffffc000; + rxdctl |= (0x1F | (1 << 8) | (1 << 24)); + ew32(RXDCTL(0), rxdctl); + ew32(RCTL, rctl | E1000_RCTL_EN); + usleep_range(100); + ew32(RCTL, rctl & ~E1000_RCTL_EN); +} + +/** + * e1000_flush_desc_rings - remove all descriptors from the descriptor rings + * + * In i219, the descriptor rings must be emptied before resetting the HW + * or before changing the device state to D3 during runtime (runtime PM). + * + * Failure to do this will cause the HW to enter a unit hang state which can + * only be released by PCI reset on the device + * + */ + +static void e1000_flush_desc_rings(struct e1000_adapter *adapter) +{ + u16 hang_state; + u32 fext_nvm11, tdlen; + struct e1000_hw *hw = &adapter->hw; + + /* First, disable MULR fix in FEXTNVM11 */ + fext_nvm11 = er32(FEXTNVM11); + fext_nvm11 |= E1000_FEXTNVM11_DISABLE_MULR_FIX; + ew32(FEXTNVM11, fext_nvm11); + /* do nothing if we're not in faulty state, or if the queue is empty */ + tdlen = er32(TDLEN(0)); + pci_read_config_word(adapter->pdev, E1000_FEXTNVM7, &hang_state); + if ((hang_state & E1000_FEXTNVM7_MULR_NEED_DESCRING_FLUSH) || tdlen) + return; + e1000_flush_tx_ring(adapter); + /* recheck, maybe the fault is caused by the rx ring */ + pci_read_config_word(adapter->pdev, E1000_FEXTNVM7, &hang_state); + if (hang_state & E1000_FEXTNVM7_MULR_NEED_DESCRING_FLUSH) + e1000_flush_rx_ring(adapter); +} + +/** * e1000e_reset - bring the hardware into a known good state * * This function boots the hardware and enables some settings that @@ -3943,6 +4035,8 @@ void e1000e_reset(struct e1000_adapter *adapter) } } + if (hw->mac.type == e1000_pch_spt) + e1000_flush_desc_rings(adapter); /* Allow time for pending master requests to run */ mac->ops.reset_hw(hw); diff --git a/drivers/net/ethernet/intel/e1000e/regs.h b/drivers/net/ethernet/intel/e1000e/regs.h index 85eefc4..4648754 100644 --- a/drivers/net/ethernet/intel/e1000e/regs.h +++ b/drivers/net/ethernet/intel/e1000e/regs.h @@ -38,6 +38,7 @@ #define E1000_FEXTNVM4 0x00024 /* Future Extended NVM 4 - RW */ #define E1000_FEXTNVM6 0x00010 /* Future Extended NVM 6 - RW */ #define E1000_FEXTNVM7 0x000E4 /* Future Extended NVM 7 - RW */ +#define E1000_FEXTNVM11 0x5BBC /* Future Extended NVM 11 - RW */ #define E1000_PCIEANACFG 0x00F18 /* PCIE Analog Config */ #define E1000_FCT 0x00030 /* Flow Control Type - RW */ #define E1000_VET 0x00038 /* VLAN Ether Type - RW */