From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 29BC52C1E18; Wed, 23 Apr 2025 15:27:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745422021; cv=none; b=bVUumyiB7KhDUqqT0aoMgMHzyhKMi/tLE4v2WNjdO/VTzfl7w51hajt5MS94fj4a46aMEbbL4c9h+NLiBfJy6P5ryyyIe5EhQ426Y73f666qOhgt3spka0GTrc0GuJ5N2FO0mt9S855e1Biob2zs6IoqizM5hdBzgDjrA0kPTrE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745422021; c=relaxed/simple; bh=IL0I3zLeSsa9qAtc2Y8N9xqUV4oWNGQKwtWG/yMLVvg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=U4el0BqD+XJNogEkW51A9uPiBFp4/OhilyvQKwlud9lt5cJG1bSoCKIUumzwpBY7PLv6n0SiRlDwPVB+iyTCffhZYklsqig13WzaVDLuRCRlaLL8EO1G90HgPwR+xKXtMRfYwUB0XBHLoQhNlpid9EKmKWPbZkRhvSAQwLwSU0c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=f8qrpCm8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="f8qrpCm8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AFCFCC4CEE2; Wed, 23 Apr 2025 15:27:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745422021; bh=IL0I3zLeSsa9qAtc2Y8N9xqUV4oWNGQKwtWG/yMLVvg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=f8qrpCm8ZKWZDT3E3eQai+EDK94SFoawweJkFIl8/gN7e18dyoJ1ToBSx4RioDSUD XaDJncPCqEHIsW51aJdg3Ahja56tZqbsFK3UFmSLLEKqr0RUJ4O6xoF2UI/d0uP/W5 Pn+hMyvSEN6sJUp+a9pLJTuQ09ZT0hfYdQuynERU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christopher S M Hall , Corinna Vinschen , Jacob Keller , Mor Bar-Gabay , Vinicius Costa Gomes , Tony Nguyen , Sasha Levin Subject: [PATCH 6.6 264/393] igc: add lock preventing multiple simultaneous PTM transactions Date: Wed, 23 Apr 2025 16:42:40 +0200 Message-ID: <20250423142654.271059930@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250423142643.246005366@linuxfoundation.org> References: <20250423142643.246005366@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christopher S M Hall [ Upstream commit 1a931c4f5e6862e61a4b130cb76b422e1415f644 ] Add a mutex around the PTM transaction to prevent multiple transactors Multiple processes try to initiate a PTM transaction, one or all may fail. This can be reproduced by running two instances of the following: $ sudo phc2sys -O 0 -i tsn0 -m PHC2SYS exits with: "ioctl PTP_OFFSET_PRECISE: Connection timed out" when the PTM transaction fails Note: Normally two instance of PHC2SYS will not run, but one process should not break another. Fixes: a90ec8483732 ("igc: Add support for PTP getcrosststamp()") Signed-off-by: Christopher S M Hall Reviewed-by: Corinna Vinschen Signed-off-by: Jacob Keller Tested-by: Mor Bar-Gabay Acked-by: Vinicius Costa Gomes Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/igc/igc.h | 1 + drivers/net/ethernet/intel/igc/igc_ptp.c | 20 ++++++++++++++++++-- 2 files changed, 19 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h index 85cc163965062..49702169a3d8a 100644 --- a/drivers/net/ethernet/intel/igc/igc.h +++ b/drivers/net/ethernet/intel/igc/igc.h @@ -266,6 +266,7 @@ struct igc_adapter { struct timespec64 prev_ptp_time; /* Pre-reset PTP clock */ ktime_t ptp_reset_start; /* Reset time in clock mono */ struct system_time_snapshot snapshot; + struct mutex ptm_lock; /* Only allow one PTM transaction at a time */ char fw_version[32]; diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c index c5387610ca3df..b6bb01a486d9d 100644 --- a/drivers/net/ethernet/intel/igc/igc_ptp.c +++ b/drivers/net/ethernet/intel/igc/igc_ptp.c @@ -943,6 +943,7 @@ static void igc_ptm_log_error(struct igc_adapter *adapter, u32 ptm_stat) } } +/* The PTM lock: adapter->ptm_lock must be held when calling igc_ptm_trigger() */ static void igc_ptm_trigger(struct igc_hw *hw) { u32 ctrl; @@ -959,6 +960,7 @@ static void igc_ptm_trigger(struct igc_hw *hw) wrfl(); } +/* The PTM lock: adapter->ptm_lock must be held when calling igc_ptm_reset() */ static void igc_ptm_reset(struct igc_hw *hw) { u32 ctrl; @@ -1037,9 +1039,16 @@ static int igc_ptp_getcrosststamp(struct ptp_clock_info *ptp, { struct igc_adapter *adapter = container_of(ptp, struct igc_adapter, ptp_caps); + int ret; - return get_device_system_crosststamp(igc_phc_get_syncdevicetime, - adapter, &adapter->snapshot, cts); + /* This blocks until any in progress PTM transactions complete */ + mutex_lock(&adapter->ptm_lock); + + ret = get_device_system_crosststamp(igc_phc_get_syncdevicetime, + adapter, &adapter->snapshot, cts); + mutex_unlock(&adapter->ptm_lock); + + return ret; } /** @@ -1116,6 +1125,7 @@ void igc_ptp_init(struct igc_adapter *adapter) spin_lock_init(&adapter->ptp_tx_lock); spin_lock_init(&adapter->tmreg_lock); + mutex_init(&adapter->ptm_lock); adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE; adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF; @@ -1128,6 +1138,7 @@ void igc_ptp_init(struct igc_adapter *adapter) if (IS_ERR(adapter->ptp_clock)) { adapter->ptp_clock = NULL; netdev_err(netdev, "ptp_clock_register failed\n"); + mutex_destroy(&adapter->ptm_lock); } else if (adapter->ptp_clock) { netdev_info(netdev, "PHC added\n"); adapter->ptp_flags |= IGC_PTP_ENABLED; @@ -1157,10 +1168,12 @@ static void igc_ptm_stop(struct igc_adapter *adapter) struct igc_hw *hw = &adapter->hw; u32 ctrl; + mutex_lock(&adapter->ptm_lock); ctrl = rd32(IGC_PTM_CTRL); ctrl &= ~IGC_PTM_CTRL_EN; wr32(IGC_PTM_CTRL, ctrl); + mutex_unlock(&adapter->ptm_lock); } /** @@ -1202,6 +1215,7 @@ void igc_ptp_stop(struct igc_adapter *adapter) netdev_info(adapter->netdev, "PHC removed\n"); adapter->ptp_flags &= ~IGC_PTP_ENABLED; } + mutex_destroy(&adapter->ptm_lock); } /** @@ -1241,6 +1255,7 @@ void igc_ptp_reset(struct igc_adapter *adapter) if (!igc_is_crosststamp_supported(adapter)) break; + mutex_lock(&adapter->ptm_lock); wr32(IGC_PCIE_DIG_DELAY, IGC_PCIE_DIG_DELAY_DEFAULT); wr32(IGC_PCIE_PHY_DELAY, IGC_PCIE_PHY_DELAY_DEFAULT); @@ -1264,6 +1279,7 @@ void igc_ptp_reset(struct igc_adapter *adapter) netdev_err(adapter->netdev, "Timeout reading IGC_PTM_STAT register\n"); igc_ptm_reset(hw); + mutex_unlock(&adapter->ptm_lock); break; default: /* No work to do. */ -- 2.39.5