linux-kernel - [PATCH v4 11/11] PCI: Document the Capability accessor RMW improvements

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Date:   Thu, 13 Jul 2023 15:45:05 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Lukas Wunner <lukas@...ner.de>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Dean Luick <dean.luick@...nelisnetworks.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jonas Dreßler <verdre@...d.nl>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v4 11/11] PCI: Document the Capability accessor RMW improvements

Documentation claims port service drivers should play nice wrt. PCIe
Capability changes but the concurrency control is now provided in the
Capability accessors as long as the correct ones are used.

Update the documention to match the RMW accessor behavior.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 Documentation/PCI/pciebus-howto.rst | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/Documentation/PCI/pciebus-howto.rst b/Documentation/PCI/pciebus-howto.rst
index f882ff62c51f..a0027e8fb0d0 100644
--- a/Documentation/PCI/pciebus-howto.rst
+++ b/Documentation/PCI/pciebus-howto.rst
@@ -213,8 +213,12 @@ PCI Config Registers
 --------------------
 
 Each service driver runs its PCI config operations on its own
-capability structure except the PCI Express capability structure, in
-which Root Control register and Device Control register are shared
-between PME and AER. This patch assumes that all service drivers
-will be well behaved and not overwrite other service driver's
-configuration settings.
+capability structure except the PCI Express capability structure,
+that is shared between many drivers including the service drivers.
+RMW Capability accessors (pcie_capability_clear_and_set_word(),
+pcie_capability_set_word(), and pcie_capability_clear_word()) protect
+a selected set of PCI Express Capability Registers (Link Control
+Register and Root Control Register). Any change to those registers
+should be performed using RMW accessors to avoid problems due to
+concurrent updates. For the up-to-date list of protected registers,
+see pcie_capability_clear_and_set_word().
-- 
2.30.2