From patchwork Tue Jan 24 17:35:56 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 9535597 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 50E686046A for ; Tue, 24 Jan 2017 17:36:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 40D1226E3A for ; Tue, 24 Jan 2017 17:36:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 355F326E4E; Tue, 24 Jan 2017 17:36:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AD9D726E3A for ; Tue, 24 Jan 2017 17:36:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750744AbdAXRgE (ORCPT ); Tue, 24 Jan 2017 12:36:04 -0500 Received: from mail.kernel.org ([198.145.29.136]:33632 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750707AbdAXRgD (ORCPT ); Tue, 24 Jan 2017 12:36:03 -0500 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2CE0A2042C; Tue, 24 Jan 2017 17:36:01 +0000 (UTC) Received: from redhat.com (unknown [66.187.232.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 410D02041A; Tue, 24 Jan 2017 17:35:58 +0000 (UTC) Date: Tue, 24 Jan 2017 19:35:56 +0200 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: Linas Vepstas , Bjorn Helgaas , Jonathan Corbet , Mike Marciniszyn , Dennis Dalessandro , Doug Ledford , Sean Hefty , Hal Rosenstock , Mauro Carvalho Chehab , Frank Haverkamp , Gabriel Krisman Bertazi , linux-pci@vger.kernel.org, linux-doc@vger.kernel.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH v2] pci: drop link_reset Message-ID: <1485279206-27729-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email 2.8.0.287.g0deeb61 X-Mutt-Fcc: =sent X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP No hardware seems to actually call link_reset, and no driver implements it as more than a nop stub. This drops the mentions of the callback from everywhere. It's dropped from the documentation as well, but the doc really needs to be updated to reflect reality better (e.g. on pcie slot reset is the link reset). This will be done in a later patch. Signed-off-by: Michael S. Tsirkin --- changes from v2: - drop from genwqe as well Note: Doug has patches dropping the implementation from infiniband card drivers in his tree already. This is unlikely to cause conflicts though. Documentation/PCI/pci-error-recovery.txt | 24 +++--------------------- drivers/infiniband/hw/hfi1/pcie.c | 10 ---------- drivers/infiniband/hw/qib/qib_pcie.c | 8 -------- drivers/media/pci/ngene/ngene-cards.c | 7 ------- drivers/misc/genwqe/card_base.c | 1 - include/linux/pci.h | 3 --- 6 files changed, 3 insertions(+), 50 deletions(-) diff --git a/Documentation/PCI/pci-error-recovery.txt b/Documentation/PCI/pci-error-recovery.txt index ac26869..da3b217 100644 --- a/Documentation/PCI/pci-error-recovery.txt +++ b/Documentation/PCI/pci-error-recovery.txt @@ -78,7 +78,6 @@ struct pci_error_handlers { int (*error_detected)(struct pci_dev *dev, enum pci_channel_state); int (*mmio_enabled)(struct pci_dev *dev); - int (*link_reset)(struct pci_dev *dev); int (*slot_reset)(struct pci_dev *dev); void (*resume)(struct pci_dev *dev); }; @@ -104,8 +103,7 @@ if it implements any, it must implement error_detected(). If a callback is not implemented, the corresponding feature is considered unsupported. For example, if mmio_enabled() and resume() aren't there, then it is assumed that the driver is not doing any direct recovery and requires -a slot reset. If link_reset() is not implemented, the card is assumed to -not care about link resets. Typically a driver will want to know about +a slot reset. Typically a driver will want to know about a slot_reset(). The actual steps taken by a platform to recover from a PCI error @@ -232,25 +230,9 @@ proceeds to STEP 4 (Slot Reset) STEP 3: Link Reset ------------------ -The platform resets the link, and then calls the link_reset() callback -on all affected device drivers. This is a PCI-Express specific state +The platform resets the link. This is a PCI-Express specific step and is done whenever a non-fatal error has been detected that can be -"solved" by resetting the link. This call informs the driver of the -reset and the driver should check to see if the device appears to be -in working condition. - -The driver is not supposed to restart normal driver I/O operations -at this point. It should limit itself to "probing" the device to -check its recoverability status. If all is right, then the platform -will call resume() once all drivers have ack'd link_reset(). - - Result codes: - (identical to STEP 3 (MMIO Enabled) - -The platform then proceeds to either STEP 4 (Slot Reset) or STEP 5 -(Resume Operations). - ->>> The current powerpc implementation does not implement this callback. +"solved" by resetting the link. STEP 4: Slot Reset ------------------ diff --git a/drivers/infiniband/hw/hfi1/pcie.c b/drivers/infiniband/hw/hfi1/pcie.c index 4ac8f33..ebd941f 100644 --- a/drivers/infiniband/hw/hfi1/pcie.c +++ b/drivers/infiniband/hw/hfi1/pcie.c @@ -598,15 +598,6 @@ pci_slot_reset(struct pci_dev *pdev) return PCI_ERS_RESULT_CAN_RECOVER; } -static pci_ers_result_t -pci_link_reset(struct pci_dev *pdev) -{ - struct hfi1_devdata *dd = pci_get_drvdata(pdev); - - dd_dev_info(dd, "HFI1 link_reset function called, ignored\n"); - return PCI_ERS_RESULT_CAN_RECOVER; -} - static void pci_resume(struct pci_dev *pdev) { @@ -625,7 +616,6 @@ pci_resume(struct pci_dev *pdev) const struct pci_error_handlers hfi1_pci_err_handler = { .error_detected = pci_error_detected, .mmio_enabled = pci_mmio_enabled, - .link_reset = pci_link_reset, .slot_reset = pci_slot_reset, .resume = pci_resume, }; diff --git a/drivers/infiniband/hw/qib/qib_pcie.c b/drivers/infiniband/hw/qib/qib_pcie.c index 6abe1c6..c379b83 100644 --- a/drivers/infiniband/hw/qib/qib_pcie.c +++ b/drivers/infiniband/hw/qib/qib_pcie.c @@ -682,13 +682,6 @@ qib_pci_slot_reset(struct pci_dev *pdev) return PCI_ERS_RESULT_CAN_RECOVER; } -static pci_ers_result_t -qib_pci_link_reset(struct pci_dev *pdev) -{ - qib_devinfo(pdev, "QIB link_reset function called, ignored\n"); - return PCI_ERS_RESULT_CAN_RECOVER; -} - static void qib_pci_resume(struct pci_dev *pdev) { @@ -707,7 +700,6 @@ qib_pci_resume(struct pci_dev *pdev) const struct pci_error_handlers qib_pci_err_handler = { .error_detected = qib_pci_error_detected, .mmio_enabled = qib_pci_mmio_enabled, - .link_reset = qib_pci_link_reset, .slot_reset = qib_pci_slot_reset, .resume = qib_pci_resume, }; diff --git a/drivers/media/pci/ngene/ngene-cards.c b/drivers/media/pci/ngene/ngene-cards.c index 423e8c8..8438c1c 100644 --- a/drivers/media/pci/ngene/ngene-cards.c +++ b/drivers/media/pci/ngene/ngene-cards.c @@ -781,12 +781,6 @@ static pci_ers_result_t ngene_error_detected(struct pci_dev *dev, return PCI_ERS_RESULT_CAN_RECOVER; } -static pci_ers_result_t ngene_link_reset(struct pci_dev *dev) -{ - printk(KERN_INFO DEVICE_NAME ": link reset\n"); - return 0; -} - static pci_ers_result_t ngene_slot_reset(struct pci_dev *dev) { printk(KERN_INFO DEVICE_NAME ": slot reset\n"); @@ -800,7 +794,6 @@ static void ngene_resume(struct pci_dev *dev) static const struct pci_error_handlers ngene_errors = { .error_detected = ngene_error_detected, - .link_reset = ngene_link_reset, .slot_reset = ngene_slot_reset, .resume = ngene_resume, }; diff --git a/drivers/misc/genwqe/card_base.c b/drivers/misc/genwqe/card_base.c index 6c1f49a..4fd21e8 100644 --- a/drivers/misc/genwqe/card_base.c +++ b/drivers/misc/genwqe/card_base.c @@ -1336,7 +1336,6 @@ static int genwqe_sriov_configure(struct pci_dev *dev, int numvfs) static struct pci_error_handlers genwqe_err_handler = { .error_detected = genwqe_err_error_detected, .mmio_enabled = genwqe_err_result_none, - .link_reset = genwqe_err_result_none, .slot_reset = genwqe_err_slot_reset, .resume = genwqe_err_resume, }; diff --git a/include/linux/pci.h b/include/linux/pci.h index e2d1a12..2c0158b 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -678,9 +678,6 @@ struct pci_error_handlers { /* MMIO has been re-enabled, but not DMA */ pci_ers_result_t (*mmio_enabled)(struct pci_dev *dev); - /* PCI Express link has been reset */ - pci_ers_result_t (*link_reset)(struct pci_dev *dev); - /* PCI slot has been reset */ pci_ers_result_t (*slot_reset)(struct pci_dev *dev);