From patchwork Thu Oct 24 17:27:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Miroshnichenko X-Patchwork-Id: 11210537 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AA7B0139A for ; Thu, 24 Oct 2019 17:27:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 885D720659 for ; Thu, 24 Oct 2019 17:27:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yadro.com header.i=@yadro.com header.b="V5ncIXvg" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726106AbfJXR1e (ORCPT ); Thu, 24 Oct 2019 13:27:34 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:49744 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2394016AbfJXR1d (ORCPT ); Thu, 24 Oct 2019 13:27:33 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 3149142F15; Thu, 24 Oct 2019 17:27:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :x-mailer:message-id:date:date:subject:subject:from:from :received:received:received; s=mta-01; t=1571938050; x= 1573752451; bh=aHxTFcPy9x4pTAr3BLyPjqx9Bb7cTzN8Ohp8fzqtGRM=; b=V 5ncIXvgIrFSfY2JH4868INccGQW3Iv0zO9FAFgNPOrhPxMPot3CMWy7qZC08QAo/ Ym9q2FiqRVmzeqKIsCiz3gCDlNMvE5MByO9R7lyuxEcsIxb1gKXmyYV/jS8QVK4U HMCwujMSTsNo18vEPSGIOmD0myKNLRQe7PQjCMIEEg= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WfW085DNjnxR; Thu, 24 Oct 2019 20:27:30 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (t-exch-02.corp.yadro.com [172.17.10.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id 0E62742F14; Thu, 24 Oct 2019 20:27:30 +0300 (MSK) Received: from NB-148.yadro.com (172.17.15.136) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Thu, 24 Oct 2019 20:27:29 +0300 From: Sergey Miroshnichenko To: CC: Bjorn Helgaas , , Sergey Miroshnichenko , Lukas Wunner Subject: [PATCH] PCI: pciehp: Don't wait for Command Completed if this interrupt is disabled Date: Thu, 24 Oct 2019 20:27:21 +0300 Message-ID: <20191024172721.879226-1-s.miroshnichenko@yadro.com> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 X-Originating-IP: [172.17.15.136] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org pcie_init() invokes pcie_disable_notification() for empty slots, which in turn disables the Command Complete interrupt (unset PCI_EXP_SLTCTL_CCIE) and right after that waits for Command Complete event (PCI_EXP_SLTSTA_CC). Add a quirk for the PLX 8796 switch, which after disabling CCIE also stops setting the PCI_EXP_SLTSTA_CC bit. This quirk fixes the longer boot time - 4 seconds of delay for each empty slot: [ 4.200325] pciehp 0042:04:08.0:pcie204: Slot #40 AttnBtn+ PwrCtrl+ MRL- AttnInd+ PwrInd+ HotPlug+ Surprise- Interlock- NoCompl- LLActRep+ [ 4.200607] pciehp 0042:04:08.0:pcie204: pciehp_get_power_status: SLOTCTRL 80 value read 1c0 [ 6.217938] pciehp 0042:04:08.0:pcie204: Timeout on hotplug command 0x01c0 (issued 2020 msec ago) [ 6.217966] pciehp 0042:04:08.0:pcie204: pcie_disable_notification: SLOTCTRL 80 write cmd 0 [ 6.237938] pciehp 0042:04:08.0:pcie204: Timeout on hotplug command 0x01c0 (issued 2040 msec ago) [ 8.257939] pciehp 0042:04:08.0:pcie204: Timeout on hotplug command 0x05c0 (issued 2020 msec ago) [ 8.257974] pciehp 0042:04:08.0:pcie204: pciehp_power_off_slot: SLOTCTRL 80 write cmd 400 [ 8.258034] pci_bus 0042:07: dev 00, created physical slot 40 [ 8.277941] pciehp 0042:04:08.0:pcie204: Timeout on hotplug command 0x05c0 (issued 2040 msec ago) [ 8.277967] pciehp 0042:04:08.0:pcie204: pcie_enable_notification: SLOTCTRL 80 write cmd 1031 Cc: Lukas Wunner Signed-off-by: Sergey Miroshnichenko --- drivers/pci/hotplug/pciehp_hpc.c | 18 ++++++++++++++++++ include/linux/pci.h | 1 + 2 files changed, 19 insertions(+) diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index 1a522c1c4177..971258576be1 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -173,6 +173,10 @@ static void pcie_do_write_cmd(struct controller *ctrl, u16 cmd, (slot_ctrl_orig & CC_ERRATUM_MASK) == (slot_ctrl & CC_ERRATUM_MASK)) ctrl->cmd_busy = 0; + if (pdev->no_cmd_compl_wo_ccie && + !(ctrl->slot_ctrl & PCI_EXP_SLTCTL_CCIE)) + ctrl->cmd_busy = 0; + /* * Optionally wait for the hardware to be ready for a new command, * indicating completion of the above issued command. @@ -901,6 +905,18 @@ static void quirk_cmd_compl(struct pci_dev *pdev) pdev->broken_cmd_compl = 1; } } + +static void quirk_no_cmd_compl_wo_ccie(struct pci_dev *pdev) +{ + u32 slot_cap; + + if (pci_is_pcie(pdev)) { + pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &slot_cap); + if (slot_cap & PCI_EXP_SLTCAP_HPC && + !(slot_cap & PCI_EXP_SLTCAP_NCCS)) + pdev->no_cmd_compl_wo_ccie = 1; + } +} DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl); DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_QCOM, 0x0400, @@ -909,3 +925,5 @@ DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_QCOM, 0x0401, PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl); DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_HXT, 0x0401, PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl); +DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_PLX, 0x8796, + PCI_CLASS_BRIDGE_PCI, 8, quirk_no_cmd_compl_wo_ccie); diff --git a/include/linux/pci.h b/include/linux/pci.h index b5821134bdae..e61b92a15b19 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -437,6 +437,7 @@ struct pci_dev { #ifdef CONFIG_HOTPLUG_PCI_PCIE unsigned int broken_cmd_compl:1; /* No compl for some cmds */ + unsigned int no_cmd_compl_wo_ccie:1; /* No compl if CCIE is unset */ #endif #ifdef CONFIG_PCIE_PTM unsigned int ptm_root:1;