From patchwork Fri Sep 2 14:58:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 12964324 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 E84B0C54EE9 for ; Fri, 2 Sep 2022 15:26:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236805AbiIBP0O (ORCPT ); Fri, 2 Sep 2022 11:26:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57608 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236457AbiIBPZ1 (ORCPT ); Fri, 2 Sep 2022 11:25:27 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 47809140F9; Fri, 2 Sep 2022 07:58:41 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D7AA461EA5; Fri, 2 Sep 2022 14:58:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0593BC433D7; Fri, 2 Sep 2022 14:58:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1662130719; bh=UaAcv2RWBLYMQK9mhI6byphOyUV4nkRDSsdRZiMGcPA=; h=From:To:Cc:Subject:Date:From; b=USpoqqWGlGHH/MOYLgk69yczzjb8FtjKsCM2v1xMDFoLhGvzxQqN/9DzLGNOjso+j vUlw7imWEdINq4lIyHF1FkFrjMlb5ZtgS1DvD+N4NnuV3Jp3UpBcb/FUZGxRU1M3in HXocdoymJ0Z3wxIpBuqjzpX+pKeh6FIZCYflXROsXMTZsvz0xuqb2YDDm9Em1lZlvo S5u7OALv6vlZw0hn7UYeD4u4saCFPTZs+db+YmCODaeP3l6al1y+T7gksnSC9yIpLH OltV7IcH9cCzXktEZ3GESRO3k83SMKV0akIF/BF4O5MF4SjygXqBLJl5IvnTFaqOdk HzYQSdIVWBfdg== From: Bjorn Helgaas To: Kai-Heng Feng , Rajvi Jingar , "Rafael J . Wysocki" Cc: Koba Ko , Mika Westerberg , "David E . Box" , Sathyanarayanan Kuppuswamy , linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Bjorn Helgaas Subject: [PATCH 0/4] PCI/PM: Always disable PTM for all devices during Date: Fri, 2 Sep 2022 09:58:31 -0500 Message-Id: <20220902145835.344302-1-helgaas@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Bjorn Helgaas We currently disable PTM for Root Ports during suspend. Leaving PTM enabled for downstream devices causes UR errors if they send PTM Requests. The intent of this series is to: - Unconditionally disable PTM during suspend (even if the driver saves its own state) by moving the disable from pci_prepare_to_sleep() to pci_pm_suspend(). - Disable PTM for all devices by removing the Root Port condition. - Manually set PTM Enable when restoring PTM state because suspend saves the PTM state *after* disabling PTM. This series is intended to replace Rajvi's second patch, so we would end up with this: Rajvi PCI/PM: Simplify pci_pm_suspend_noirq() Bjorn PCI/PTM: Preserve PTM Root Select Bjorn PCI/PTM: Enable PTM when restoring state Bjorn PCI/PM: Always disable PTM for all devices during suspend Bjorn PCI/PTM: Cache PTM Capability offset Please comment! Bjorn Helgaas (4): PCI/PTM: Preserve PTM Root Select PCI/PTM: Enable PTM when restoring state PCI/PM: Always disable PTM for all devices during suspend PCI/PTM: Cache PTM Capability offset drivers/pci/pci-driver.c | 8 ++++++ drivers/pci/pci.c | 20 -------------- drivers/pci/pcie/ptm.c | 56 +++++++++++++++++++--------------------- include/linux/pci.h | 1 + 4 files changed, 35 insertions(+), 50 deletions(-)