linux-kernel - [PATCH v2 0/3] PCI/PM: Always disable PTM for all devices during suspend

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Message-Id: <20220902233543.390890-1-helgaas@kernel.org>
Date:   Fri,  2 Sep 2022 18:35:40 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Rajvi Jingar <rajvi.jingar@...ux.intel.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>
Cc:     Koba Ko <koba.ko@...onical.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        "David E . Box" <david.e.box@...ux.intel.com>,
        Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        linux-pci@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v2 0/3] PCI/PM: Always disable PTM for all devices during suspend

From: Bjorn Helgaas <bhelgaas@...gle.com>

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 and
    doing it early in the suspend paths.

  - Explicitly re-enable PTM during resume, which requires new support in
    pci_enable_ptm() for Root Ports and Switch Upstream Ports.


Bjorn Helgaas (3):
  PCI/PTM: Preserve PTM Root Select
  PCI/PTM: Implement pci_enable_ptm() for Root Ports, Switch Upstream
    Ports
  PCI/PM: Always disable PTM for all devices during suspend

 drivers/pci/pci-driver.c | 14 ++++++++++++++
 drivers/pci/pci.c        | 20 --------------------
 drivers/pci/pcie/ptm.c   | 36 ++++++++++++++++++++++++++++--------
 3 files changed, 42 insertions(+), 28 deletions(-)

-- 
2.25.1