From patchwork Wed Jun 29 09:33:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna Chaitanya Chundru X-Patchwork-Id: 12899671 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18AA3C433EF for ; Wed, 29 Jun 2022 09:34:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231649AbiF2JeC (ORCPT ); Wed, 29 Jun 2022 05:34:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232909AbiF2JeB (ORCPT ); Wed, 29 Jun 2022 05:34:01 -0400 Received: from alexa-out.qualcomm.com (alexa-out.qualcomm.com [129.46.98.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF7933B00B; Wed, 29 Jun 2022 02:34:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1656495240; x=1688031240; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=P4AGhikg620X38VfSmRxFDdGgI2V4TsuWo+pgD/SRbs=; b=C5IADQ+lIoOmhUI85w/Xmi7gXKonghtApt37qcqd84svCex5pZQEzzAY 6zqhjG1Vnn3BkIWc08KiUwIM1pWOZLakTNdoEWlrXou22QR0I4wGvScLa khv/nWJRtPNxXvxxaNZUqoPhgkR0mAHurQ7U6fuiokNnNJi2XInKFRf7u Q=; Received: from ironmsg-lv-alpha.qualcomm.com ([10.47.202.13]) by alexa-out.qualcomm.com with ESMTP; 29 Jun 2022 02:34:00 -0700 X-QCInternal: smtphost Received: from ironmsg01-blr.qualcomm.com ([10.86.208.130]) by ironmsg-lv-alpha.qualcomm.com with ESMTP/TLS/AES256-SHA; 29 Jun 2022 02:33:58 -0700 X-QCInternal: smtphost Received: from hu-krichai-hyd.qualcomm.com (HELO hu-sgudaval-hyd.qualcomm.com) ([10.213.110.37]) by ironmsg01-blr.qualcomm.com with ESMTP; 29 Jun 2022 15:03:39 +0530 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 4058933) id 628F5421D; Wed, 29 Jun 2022 15:03:39 +0530 (+0530) From: Krishna chaitanya chundru To: helgaas@kernel.org Cc: linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, quic_vbadigan@quicinc.com, quic_hemantk@quicinc.com, quic_nitegupt@quicinc.com, quic_skananth@quicinc.com, quic_ramkri@quicinc.com, manivannan.sadhasivam@linaro.org, swboyd@chromium.org, dmitry.baryshkov@linaro.org, Krishna chaitanya chundru Subject: [PATCH v2 0/2] PCI: Restrict pci transactions after pci suspend Date: Wed, 29 Jun 2022 15:03:32 +0530 Message-Id: <1656495214-4028-1-git-send-email-quic_krichai@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1656055682-18817-1-git-send-email-quic_krichai@quicinc.com> References: <1656055682-18817-1-git-send-email-quic_krichai@quicinc.com> Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org If the endpoint device state is D0 and irq's are not freed, then kernel try to mask interrupts by writing in to the vector table (for MSIX interrupts) and config space (for MSI's). These transactions are initiated after clocks are getting disabled as part of PM suspend call. Due to it, these transactions are resulting in un-clocked access and eventual to crashes. So added a logic in qcom driver to restrict the unclocked access. And updated the logic to check the link state before masking or unmasking the interrupts. Krishna chaitanya chundru (2): PCI: qcom: Add system PM support PCI: qcom: Restrict pci transactions after pci suspend drivers/pci/controller/dwc/pcie-designware-host.c | 14 ++- drivers/pci/controller/dwc/pcie-qcom.c | 116 +++++++++++++++++++++- 2 files changed, 126 insertions(+), 4 deletions(-)