From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x22416n1jMDOkd9DsoigW1cz/iG8+EXU+tylcbrtGU35wbvhDj7u8B3FOuBnpqhEq0gYSl3zV ARC-Seal: i=1; a=rsa-sha256; t=1519374284; cv=none; d=google.com; s=arc-20160816; b=XlIeo5KUFjohVAmvbrNkOsKwVDrZwNZCi/ar+85ALYCVxdSPNN98gNaNlPUKHT90VW 07j9dyakGazUBd/EcpVgqR+7iZsiZawWTHhltC7ZLkwOb7wLGGm3bgScm60N9hB6iSep R5g4zvGwT5876o6wgV8ei8ZaOxX9avQniztB8JEWH89ZJhjFM9tdIyiYUzMxiXMVN8HX Sb8ljjAYgTCuLQm85QlMbbO0o7dOcesDxfrvNJaTlTtgmrNv6NEaQOX14nvj6ZOBBxDy HDiOu1B4R/l2uvp9isgkUlO6yFlHpDlTk/30GEcvF5NjQpH7XXVwWHOo0ND+pGzn7zbB lH9w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :dmarc-filter:dkim-signature:dkim-signature :arc-authentication-results; bh=clwW3gcdfXm4uCbyrvZ/U04u+0cuqJlbDq+UT+seTik=; b=EwxkxtFXqodiLsw0mnAaTJmlLtTMEJGP5Do6s+coqelHF/RiOmgVu7ZasA6ZjGYFu8 dACFWWifFbSVW/9M7fHs9Jr5pQNAmFDjpX38oJ+uHhjgcTO91yDEMWGJkmJOcmfb9i+b ZzO9+BzTjgjgvnMYCHg0XlhHX6uvekG5H2zp9tz4HIFQnnsy6Lq5btv1zgLhf3IyCeOt O0bf9ug/iIVWFVKyy4S+G+g2nK85YUv8+JuNyhe9BX5e2LpLUJNuOi7u65Oog6p94LsL JMN7uSBSUUH72+47B9f0uwq6tLtnNDAwC/jE06cwx0cmWEp6cV8Swt+bqw4k0RQV0GrS 3Qgg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@codeaurora.org header.s=default header.b=Be+57Pgj; dkim=pass header.i=@codeaurora.org header.s=default header.b=GVzbqDb8; spf=pass (google.com: domain of poza@codeaurora.org designates 198.145.29.96 as permitted sender) smtp.mailfrom=poza@codeaurora.org Authentication-Results: mx.google.com; dkim=pass header.i=@codeaurora.org header.s=default header.b=Be+57Pgj; dkim=pass header.i=@codeaurora.org header.s=default header.b=GVzbqDb8; spf=pass (google.com: domain of poza@codeaurora.org designates 198.145.29.96 as permitted sender) smtp.mailfrom=poza@codeaurora.org DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 8F84A60A50 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=poza@codeaurora.org From: Oza Pawandeep To: Bjorn Helgaas , Philippe Ombredanne , Thomas Gleixner , Greg Kroah-Hartman , Kate Stewart , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Dongdong Liu , Keith Busch , Wei Zhang , Sinan Kaya , Timur Tabi Cc: Oza Pawandeep Subject: [PATCH v11 7/7] PCI/DPC: Enumerate the devices after DPC trigger event Date: Fri, 23 Feb 2018 13:54:04 +0530 Message-Id: <1519374244-20539-8-git-send-email-poza@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1519374244-20539-1-git-send-email-poza@codeaurora.org> References: <1519374244-20539-1-git-send-email-poza@codeaurora.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1593086428728217914?= X-GMAIL-MSGID: =?utf-8?q?1593179409710515720?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Implement error_resume callback in DPC so, after DPC trigger event enumerates the devices beneath. Signed-off-by: Oza Pawandeep diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c index e15bcda..751efc0 100644 --- a/drivers/pci/pcie/pcie-dpc.c +++ b/drivers/pci/pcie/pcie-dpc.c @@ -126,6 +126,21 @@ static void dpc_wait_link_inactive(struct dpc_dev *dpc) } /** + * dpc_error_resume - enumerate the devices beneath + * @dev: pointer to Root Port's pci_dev data structure + * + * Invoked by Port Bus driver during fatal recovery. + */ +static void dpc_error_resume(struct pci_dev *pdev) +{ + if (pci_wait_for_link(pdev, true)) { + pci_lock_rescan_remove(); + pci_rescan_bus(pdev->bus); + pci_unlock_rescan_remove(); + } +} + +/** * dpc_reset_link - reset link DPC routine * @dev: pointer to Root Port's pci_dev data structure * @@ -364,6 +379,7 @@ static void dpc_remove(struct pcie_device *dev) .probe = dpc_probe, .remove = dpc_remove, .reset_link = dpc_reset_link, + .error_resume = dpc_error_resume, }; static int __init dpc_service_init(void) diff --git a/drivers/pci/pcie/pcie-err.c b/drivers/pci/pcie/pcie-err.c index 1ea4b9a..1e1bf98 100644 --- a/drivers/pci/pcie/pcie-err.c +++ b/drivers/pci/pcie/pcie-err.c @@ -236,6 +236,7 @@ static pci_ers_result_t reset_link(struct pci_dev *dev, int severity) * @state: error state * @error_mesg: message to print * @cb: callback to be broadcast + * @severity: error severity * * Invoked during error recovery process. Once being invoked, the content * of error severity will be broadcast to all downstream drivers in a @@ -244,7 +245,8 @@ static pci_ers_result_t reset_link(struct pci_dev *dev, int severity) static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, enum pci_channel_state state, char *error_mesg, - int (*cb)(struct pci_dev *, void *)) + int (*cb)(struct pci_dev *, void *), + int severity) { struct aer_broadcast_data result_data; @@ -256,6 +258,17 @@ static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, result_data.result = PCI_ERS_RESULT_RECOVERED; if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { + /* If DPC is triggered, call resume error handler + * because, at this point we can safely assume that + * link recovery has happened, this is only handled if + * callback is resume, as this function can be called + * with multiple callbacks. + */ + if ((severity == DPC_FATAL) && + (cb == report_resume)) { + cb(dev, NULL); + return PCI_ERS_RESULT_RECOVERED; + } /* * If the error is reported by a bridge, we think this error * is related to the downstream link of the bridge, so we @@ -305,7 +318,8 @@ void pcie_do_recovery(struct pci_dev *dev, int severity) status = broadcast_error_message(dev, state, "error_detected", - report_error_detected); + report_error_detected, + severity); if (severity == AER_FATAL || severity == DPC_FATAL) { @@ -321,7 +335,8 @@ void pcie_do_recovery(struct pci_dev *dev, int severity) status = broadcast_error_message(dev, state, "mmio_enabled", - report_mmio_enabled); + report_mmio_enabled, + severity); if (status == PCI_ERS_RESULT_NEED_RESET) { /* @@ -332,7 +347,8 @@ void pcie_do_recovery(struct pci_dev *dev, int severity) status = broadcast_error_message(dev, state, "slot_reset", - report_slot_reset); + report_slot_reset, + severity); } if (status != PCI_ERS_RESULT_RECOVERED) @@ -342,7 +358,8 @@ void pcie_do_recovery(struct pci_dev *dev, int severity) broadcast_error_message(dev, state, "resume", - report_resume); + report_resume, + severity); dev_info(&dev->dev, "Device recovery successful\n"); mutex_unlock(&pci_err_recovery_lock); -- Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc., a Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.