From patchwork Wed Dec 22 06:37:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 1572029 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=canonical.com header.i=@canonical.com header.a=rsa-sha256 header.s=20210705 header.b=MzsV7pba; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.ubuntu.com (client-ip=91.189.94.19; helo=huckleberry.canonical.com; envelope-from=kernel-team-bounces@lists.ubuntu.com; receiver=) Received: from huckleberry.canonical.com (huckleberry.canonical.com [91.189.94.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4JJkF51tPJz9sRN for ; Wed, 22 Dec 2021 17:39:03 +1100 (AEDT) Received: from localhost ([127.0.0.1] helo=huckleberry.canonical.com) by huckleberry.canonical.com with esmtp (Exim 4.86_2) (envelope-from ) id 1mzvH1-0005wM-KF; Wed, 22 Dec 2021 06:38:51 +0000 Received: from smtp-relay-canonical-0.internal ([10.131.114.83] helo=smtp-relay-canonical-0.canonical.com) by huckleberry.canonical.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1mzvGw-0005vC-AG for kernel-team@lists.ubuntu.com; Wed, 22 Dec 2021 06:38:46 +0000 Received: from localhost.localdomain (unknown [10.101.196.174]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-0.canonical.com (Postfix) with ESMTPSA id 35C243F051 for ; Wed, 22 Dec 2021 06:38:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1640155126; bh=FbkecWD06XMxdfLHnv6zksi96HEFCz1svpkr2Hc9S7g=; h=From:To:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=MzsV7pbaB0Wc+HUUQWAgMvNotMFrQ2iWAOVKgbsS3/lzoBX+eUoPtbBoguijC7stR pOD8cvTE6aN18mKE4WtyBCcxcxEAR5FR/9i1vX79GyVBHjinJGKTDyMEvf2y+pjjUE 0y3DXSDIgriUT0E8atkF4PBKg4j7iGtx1FGnpwo6t87vT7tLiuByYZXa16KR/W72hp Hxke674UqRrp8HdrWzprR05QauF9jn/08Dr6CjCI4NMOfACGoXVZFrZU/EBbjl28g9 t+tpN6xAkBC8oMZlKDg1x/6wVQKqdVBamUQVlfS/a5Y5w8+tmMyvfpUuRWUreeuhJs B5VJL5H5r6ldw== From: Kai-Heng Feng To: kernel-team@lists.ubuntu.com Subject: [I/OEM-5.14] [PATCH] rtw88: Disable PCIe ASPM while doing NAPI poll on 8821CE Date: Wed, 22 Dec 2021 14:37:58 +0800 Message-Id: <20211222063758.153688-3-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211222063758.153688-1-kai.heng.feng@canonical.com> References: <20211222063758.153688-1-kai.heng.feng@canonical.com> MIME-Version: 1.0 X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.20 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: "kernel-team" BugLink: https://bugs.launchpad.net/bugs/1927808 Many Intel based platforms face system random freeze after commit 9e2fd29864c5 ("rtw88: add napi support"). The commit itself shouldn't be the culprit. My guess is that the 8821CE only leaves ASPM L1 for a short period when IRQ is raised. Since IRQ is masked during NAPI polling, the PCIe link stays at L1 and makes RX DMA extremely slow. Eventually the RX ring becomes messed up: [ 1133.194697] rtw_8821ce 0000:02:00.0: pci bus timeout, check dma status Since the 8821CE hardware may fail to leave ASPM L1, manually do it in the driver to resolve the issue. Fixes: 9e2fd29864c5 ("rtw88: add napi support") Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215131 BugLink: https://bugs.launchpad.net/bugs/1927808 Signed-off-by: Kai-Heng Feng Acked-by: Jian-Hong Pan Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20211215114635.333767-1-kai.heng.feng@canonical.com (backported from commit 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a linux-next) Signed-off-by: Kai-Heng Feng --- drivers/net/wireless/realtek/rtw88/pci.c | 52 +++++++++--------------- drivers/net/wireless/realtek/rtw88/pci.h | 2 + 2 files changed, 21 insertions(+), 33 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c index e7d17ab8f113b..029bd7de9db2a 100644 --- a/drivers/net/wireless/realtek/rtw88/pci.c +++ b/drivers/net/wireless/realtek/rtw88/pci.c @@ -2,7 +2,6 @@ /* Copyright(c) 2018-2019 Realtek Corporation */ -#include #include #include #include "main.h" @@ -1395,7 +1394,11 @@ static void rtw_pci_link_ps(struct rtw_dev *rtwdev, bool enter) * throughput. This is probably because the ASPM behavior slightly * varies from different SOC. */ - if (rtwpci->link_ctrl & PCI_EXP_LNKCTL_ASPM_L1) + if (!(rtwpci->link_ctrl & PCI_EXP_LNKCTL_ASPM_L1)) + return; + + if ((enter && atomic_dec_if_positive(&rtwpci->link_usage) == 0) || + (!enter && atomic_inc_return(&rtwpci->link_usage) == 1)) rtw_pci_aspm_set(rtwdev, enter); } @@ -1630,6 +1633,9 @@ static int rtw_pci_napi_poll(struct napi_struct *napi, int budget) priv); int work_done = 0; + if (rtwpci->rx_no_aspm) + rtw_pci_link_ps(rtwdev, false); + while (work_done < budget) { u32 work_done_once; @@ -1653,6 +1659,8 @@ static int rtw_pci_napi_poll(struct napi_struct *napi, int budget) if (rtw_pci_get_hw_rx_ring_nr(rtwdev, rtwpci)) napi_schedule(napi); } + if (rtwpci->rx_no_aspm) + rtw_pci_link_ps(rtwdev, true); return work_done; } @@ -1674,41 +1682,13 @@ static void rtw_pci_napi_deinit(struct rtw_dev *rtwdev) netif_napi_del(&rtwpci->napi); } -enum rtw88_quirk_dis_pci_caps { - QUIRK_DIS_PCI_CAP_MSI, - QUIRK_DIS_PCI_CAP_ASPM, -}; - -static int disable_pci_caps(const struct dmi_system_id *dmi) -{ - uintptr_t dis_caps = (uintptr_t)dmi->driver_data; - - if (dis_caps & BIT(QUIRK_DIS_PCI_CAP_MSI)) - rtw_disable_msi = true; - if (dis_caps & BIT(QUIRK_DIS_PCI_CAP_ASPM)) - rtw_pci_disable_aspm = true; - - return 1; -} - -static const struct dmi_system_id rtw88_pci_quirks[] = { - { - .callback = disable_pci_caps, - .ident = "Protempo Ltd L116HTN6SPW", - .matches = { - DMI_MATCH(DMI_SYS_VENDOR, "Protempo Ltd"), - DMI_MATCH(DMI_PRODUCT_NAME, "L116HTN6SPW"), - }, - .driver_data = (void *)BIT(QUIRK_DIS_PCI_CAP_ASPM), - }, - {} -}; - int rtw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { + struct pci_dev *bridge = pci_upstream_bridge(pdev); struct ieee80211_hw *hw; struct rtw_dev *rtwdev; + struct rtw_pci *rtwpci; int drv_data_size; int ret; @@ -1726,6 +1706,9 @@ int rtw_pci_probe(struct pci_dev *pdev, rtwdev->hci.ops = &rtw_pci_ops; rtwdev->hci.type = RTW_HCI_TYPE_PCIE; + rtwpci = (struct rtw_pci *)rtwdev->priv; + atomic_set(&rtwpci->link_usage, 1); + ret = rtw_core_init(rtwdev); if (ret) goto err_release_hw; @@ -1754,7 +1737,10 @@ int rtw_pci_probe(struct pci_dev *pdev, goto err_destroy_pci; } - dmi_check_system(rtw88_pci_quirks); + /* Disable PCIe ASPM L1 while doing NAPI poll for 8821CE */ + if (pdev->device == 0xc821 && bridge->vendor == PCI_VENDOR_ID_INTEL) + rtwpci->rx_no_aspm = true; + rtw_pci_phy_cfg(rtwdev); ret = rtw_register_hw(rtwdev, hw); diff --git a/drivers/net/wireless/realtek/rtw88/pci.h b/drivers/net/wireless/realtek/rtw88/pci.h index 0ffae887527a2..cbbae130e620b 100644 --- a/drivers/net/wireless/realtek/rtw88/pci.h +++ b/drivers/net/wireless/realtek/rtw88/pci.h @@ -222,6 +222,8 @@ struct rtw_pci { struct rtw_pci_tx_ring tx_rings[RTK_MAX_TX_QUEUE_NUM]; struct rtw_pci_rx_ring rx_rings[RTK_MAX_RX_QUEUE_NUM]; u16 link_ctrl; + atomic_t link_usage; + bool rx_no_aspm; DECLARE_BITMAP(flags, NUM_OF_RTW_PCI_FLAGS); void __iomem *mmap;