From mboxrd@z Thu Jan 1 00:00:00 1970 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 D728AC4332F for ; Mon, 28 Mar 2022 23:00:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230203AbiC1XCM (ORCPT ); Mon, 28 Mar 2022 19:02:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42788 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230242AbiC1XCJ (ORCPT ); Mon, 28 Mar 2022 19:02:09 -0400 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1FD8126131 for ; Mon, 28 Mar 2022 16:00:23 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-2e68c93bb30so130428717b3.18 for ; Mon, 28 Mar 2022 16:00:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=PjCJgoS657I/tk8eQdlHI01Sy2nbJ1vs0eOca3BDeMA=; b=YrW1oHI6OeNS97qb0yJLiWsmS/O0yisj3J+4OLHulXFrVW++E6+RYQOIE9kRM8gvPl nYVOVSMnQ38vUWHmvPhbD7Di+LW8cxAlhFJk6rylh8ho4c7W6RbVgiqFR3kqbUGal79N AnGraxxjbZ/qEIuvv/3hskPbqVzITszKNTauorm3U5A10LAz33yyLW+qRHr39PSjgZEc gFxP0vIK4JjSTg72HAxnLs1TerTNewB0WjKzK2tZmdEGrsphjP+GpJ/8nRfVGtQ6/6oh 8DnJjPZ35lUPzzKkyIyhHXn9zk+j+m6UjTXpgJYAHJ8LEDsxYZSRsjbEB7hd4MEVv7fE U7mw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=PjCJgoS657I/tk8eQdlHI01Sy2nbJ1vs0eOca3BDeMA=; b=IvdtviJqqhw41R0j9ynipyw7TNgZGZ4MQsALjws2Cc7eATLszFbYT4ebzspHnQjZcL DGf+nFOORpCOGzMyaYoZgH0nlXleyFnBCTDP9KZKACM7y3YVsQ/84NEogR+aVgmRaxGe oOHVGZZV2ah+SVAVCT4aPSx5ZpuwZkE4yoA8BduSUAOZBy526gNJ1y8ygkL5DdWKfBBp S1pugVY3ackIfd//oP1uJpFruX3DV3lylvwWaBGJRazSDbcY2sCI9PvHQkr0cMSLGCOk AA9Dq7ZAcy6sGULcZWEjaWEumwolwcS7gfF4Te/Qrpwj8UyJPMq8uD0ZzcZ88fq40jS9 v/DA== X-Gm-Message-State: AOAM532gYIe4kRTeD6Ats036WJAbtT3T6TG4kTZzMWq3erMpBO3oJ27q NuIgPNU6RVTxio8DfZlwaHgIsrh3vVXpFjg= X-Google-Smtp-Source: ABdhPJzCP0I8+FlderVfuOTtetUSRQ7p5Ej5WF/C0Zw2u46sRNYBzp8kbYF//zgxfxG0NFdnd84urn2FfzqAcr0= X-Received: from tansuresh.svl.corp.google.com ([2620:15c:2c5:13:3dbb:6bbc:98be:a31e]) (user=tansuresh job=sendgmr) by 2002:a81:c02:0:b0:2e5:b6af:2c8 with SMTP id 2-20020a810c02000000b002e5b6af02c8mr29031195ywm.190.1648508422372; Mon, 28 Mar 2022 16:00:22 -0700 (PDT) Date: Mon, 28 Mar 2022 16:00:07 -0700 In-Reply-To: <20220328230008.3587975-2-tansuresh@google.com> Message-Id: <20220328230008.3587975-3-tansuresh@google.com> Mime-Version: 1.0 References: <20220328230008.3587975-1-tansuresh@google.com> <20220328230008.3587975-2-tansuresh@google.com> X-Mailer: git-send-email 2.35.1.1021.g381101b075-goog Subject: [PATCH v1 2/3] PCI: Support asynchronous shutdown From: Tanjore Suresh To: Greg Kroah-Hartman , "Rafael J . Wysocki" , Christoph Hellwig , Sagi Grimberg , Bjorn Helgaas Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, Tanjore Suresh Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Enhances the base PCI driver to add support for asynchronous shutdown. Assume a device takes n secs to shutdown. If a machine has been populated with M such devices, the total time spent in shutting down all the devices will be M * n secs, if the shutdown is done synchronously. For example, if NVMe PCI Controllers take 5 secs to shutdown and if there are 16 such NVMe controllers in a system, system will spend a total of 80 secs to shutdown all NVMe devices in that system. In order to speed up the shutdown time, asynchronous interface to shutdown has been implemented. This will significantly reduce the machine reboot time. Signed-off-by: Tanjore Suresh --- drivers/pci/pci-driver.c | 17 ++++++++++++++--- include/linux/pci.h | 2 ++ 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 4ceeb75fc899..0d0b46d71e88 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -501,14 +501,16 @@ static void pci_device_remove(struct device *dev) pci_dev_put(pci_dev); } -static void pci_device_shutdown(struct device *dev) +static void pci_device_shutdown_pre(struct device *dev) { struct pci_dev *pci_dev = to_pci_dev(dev); struct pci_driver *drv = pci_dev->driver; pm_runtime_resume(dev); - if (drv && drv->shutdown) + if (drv && drv->shutdown_pre) + drv->shutdown_pre(pci_dev); + else if (drv && drv->shutdown) drv->shutdown(pci_dev); /* @@ -522,6 +524,14 @@ static void pci_device_shutdown(struct device *dev) pci_clear_master(pci_dev); } +static void pci_device_shutdown_post(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + struct pci_driver *drv = pci_dev->driver; + + if (drv && drv->shutdown_post) + drv->shutdown_post(pci_dev); +} #ifdef CONFIG_PM /* Auxiliary functions used for system resume and run-time resume. */ @@ -1625,7 +1635,8 @@ struct bus_type pci_bus_type = { .uevent = pci_uevent, .probe = pci_device_probe, .remove = pci_device_remove, - .shutdown = pci_device_shutdown, + .shutdown_pre = pci_device_shutdown_pre, + .shutdown_post = pci_device_shutdown_post, .dev_groups = pci_dev_groups, .bus_groups = pci_bus_groups, .drv_groups = pci_drv_groups, diff --git a/include/linux/pci.h b/include/linux/pci.h index b957eeb89c7a..19047fcb3c8a 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -905,6 +905,8 @@ struct pci_driver { int (*suspend)(struct pci_dev *dev, pm_message_t state); /* Device suspended */ int (*resume)(struct pci_dev *dev); /* Device woken up */ void (*shutdown)(struct pci_dev *dev); + void (*shutdown_pre)(struct pci_dev *dev); + void (*shutdown_post)(struct pci_dev *dev); int (*sriov_configure)(struct pci_dev *dev, int num_vfs); /* On PF */ int (*sriov_set_msix_vec_count)(struct pci_dev *vf, int msix_vec_count); /* On PF */ u32 (*sriov_get_vf_total_msix)(struct pci_dev *pf); -- 2.35.1.1021.g381101b075-goog