__  __    __   __  _____      _            _          _____ _          _ _ 
 |  \/  |   \ \ / / |  __ \    (_)          | |        / ____| |        | | |
 | \  / |_ __\ V /  | |__) | __ ___   ____ _| |_ ___  | (___ | |__   ___| | |
 | |\/| | '__|> <   |  ___/ '__| \ \ / / _` | __/ _ \  \___ \| '_ \ / _ \ | |
 | |  | | |_ / . \  | |   | |  | |\ V / (_| | ||  __/  ____) | | | |  __/ | |
 |_|  |_|_(_)_/ \_\ |_|   |_|  |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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<section id="pci-bus-subsystem">
<h1>PCI Bus Subsystem<a class="headerlink" href="#pci-bus-subsystem" title="Link to this heading">¶</a></h1>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="pci.html">1. How To Write Linux PCI Drivers</a><ul>
<li class="toctree-l2"><a class="reference internal" href="pci.html#structure-of-pci-drivers">1.1. Structure of PCI drivers</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci.html#pci-register-driver-call">1.2. pci_register_driver() call</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci.html#how-to-find-pci-devices-manually">1.3. How to find PCI devices manually</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci.html#device-initialization-steps">1.4. Device Initialization Steps</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci.html#pci-device-shutdown">1.5. PCI device shutdown</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci.html#how-to-access-pci-config-space">1.6. How to access PCI config space</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci.html#other-interesting-functions">1.7. Other interesting functions</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci.html#miscellaneous-hints">1.8. Miscellaneous hints</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci.html#vendor-and-device-identifications">1.9. Vendor and device identifications</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci.html#obsolete-functions">1.10. Obsolete functions</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci.html#mmio-space-and-write-posting">1.11. MMIO Space and “Write Posting”</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="pciebus-howto.html">2. The PCI Express Port Bus Driver Guide HOWTO</a><ul>
<li class="toctree-l2"><a class="reference internal" href="pciebus-howto.html#about-this-guide">2.1. About this guide</a></li>
<li class="toctree-l2"><a class="reference internal" href="pciebus-howto.html#what-is-the-pci-express-port-bus-driver">2.2. What is the PCI Express Port Bus Driver</a></li>
<li class="toctree-l2"><a class="reference internal" href="pciebus-howto.html#why-use-the-pci-express-port-bus-driver">2.3. Why use the PCI Express Port Bus Driver?</a></li>
<li class="toctree-l2"><a class="reference internal" href="pciebus-howto.html#configuring-the-pci-express-port-bus-driver-vs-service-drivers">2.4. Configuring the PCI Express Port Bus Driver vs. Service Drivers</a></li>
<li class="toctree-l2"><a class="reference internal" href="pciebus-howto.html#possible-resource-conflicts">2.5. Possible Resource Conflicts</a></li>
</ul>
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<li class="toctree-l1"><a class="reference internal" href="pci-iov-howto.html">3. PCI Express I/O Virtualization Howto</a><ul>
<li class="toctree-l2"><a class="reference internal" href="pci-iov-howto.html#overview">3.1. Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci-iov-howto.html#user-guide">3.2. User Guide</a></li>
<li class="toctree-l2"><a class="reference internal" href="pci-iov-howto.html#developer-guide">3.3. Developer Guide</a></li>
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<li class="toctree-l1"><a class="reference internal" href="msi-howto.html">4. The MSI Driver Guide HOWTO</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="msi-howto.html#what-are-msis">4.2. What are MSIs?</a></li>
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<li class="toctree-l2"><a class="reference internal" href="msi-howto.html#list-of-device-drivers-msi-x-apis">4.6. List of device drivers MSI(-X) APIs</a></li>
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<li class="toctree-l1"><a class="reference internal" href="sysfs-pci.html">5. Accessing PCI device resources through sysfs</a><ul>
<li class="toctree-l2"><a class="reference internal" href="sysfs-pci.html#accessing-legacy-resources-through-sysfs">5.1. Accessing legacy resources through sysfs</a></li>
<li class="toctree-l2"><a class="reference internal" href="sysfs-pci.html#supporting-pci-access-on-new-platforms">5.2. Supporting PCI access on new platforms</a></li>
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<li class="toctree-l1"><a class="reference internal" href="acpi-info.html">6. ACPI considerations for PCI host bridges</a></li>
<li class="toctree-l1"><a class="reference internal" href="pci-error-recovery.html">7. PCI Error Recovery</a><ul>
<li class="toctree-l2"><a class="reference internal" href="pci-error-recovery.html#detailed-design">7.1. Detailed Design</a></li>
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<li class="toctree-l1"><a class="reference internal" href="pcieaer-howto.html">8. The PCI Express Advanced Error Reporting Driver Guide HOWTO</a><ul>
<li class="toctree-l2"><a class="reference internal" href="pcieaer-howto.html#overview">8.1. Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="pcieaer-howto.html#user-guide">8.2. User Guide</a></li>
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<li class="toctree-l2"><a class="reference internal" href="pcieaer-howto.html#software-error-injection">8.4. Software error injection</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="endpoint/index.html">9. PCI Endpoint Framework</a><ul>
<li class="toctree-l2"><a class="reference internal" href="endpoint/pci-endpoint.html">9.1. Introduction</a></li>
<li class="toctree-l2"><a class="reference internal" href="endpoint/pci-endpoint.html#pci-endpoint-core">9.2. PCI Endpoint Core</a></li>
<li class="toctree-l2"><a class="reference internal" href="endpoint/pci-endpoint-cfs.html">9.3. Configuring PCI Endpoint Using CONFIGFS</a></li>
<li class="toctree-l2"><a class="reference internal" href="endpoint/pci-test-function.html">9.4. PCI Test Function</a></li>
<li class="toctree-l2"><a class="reference internal" href="endpoint/pci-test-howto.html">9.5. PCI Test User Guide</a></li>
<li class="toctree-l2"><a class="reference internal" href="endpoint/pci-ntb-function.html">9.6. PCI NTB Function</a></li>
<li class="toctree-l2"><a class="reference internal" href="endpoint/pci-ntb-howto.html">9.7. PCI Non-Transparent Bridge (NTB) Endpoint Function (EPF) User Guide</a></li>
<li class="toctree-l2"><a class="reference internal" href="endpoint/pci-vntb-function.html">9.8. PCI vNTB Function</a></li>
<li class="toctree-l2"><a class="reference internal" href="endpoint/pci-vntb-howto.html">9.9. PCI Non-Transparent Bridge (NTB) Endpoint Function (EPF) User Guide</a></li>
<li class="toctree-l2"><a class="reference internal" href="endpoint/pci-nvme-function.html">9.10. PCI NVMe Function</a></li>
<li class="toctree-l2"><a class="reference internal" href="endpoint/function/binding/pci-test.html">9.11. PCI Test Endpoint Function</a></li>
<li class="toctree-l2"><a class="reference internal" href="endpoint/function/binding/pci-ntb.html">9.12. PCI NTB Endpoint Function</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="controller/index.html">10. PCI Native Host Bridge and Endpoint Drivers</a><ul>
<li class="toctree-l2"><a class="reference internal" href="controller/rcar-pcie-firmware.html">10.1. Firmware of PCIe controller for Renesas R-Car V4H</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="boot-interrupts.html">11. Boot Interrupts</a><ul>
<li class="toctree-l2"><a class="reference internal" href="boot-interrupts.html#overview">11.1. Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="boot-interrupts.html#issue">11.2. Issue</a></li>
<li class="toctree-l2"><a class="reference internal" href="boot-interrupts.html#conditions">11.3. Conditions</a></li>
<li class="toctree-l2"><a class="reference internal" href="boot-interrupts.html#affected-chipsets">11.4. Affected Chipsets</a></li>
<li class="toctree-l2"><a class="reference internal" href="boot-interrupts.html#mitigations">11.5. Mitigations</a></li>
<li class="toctree-l2"><a class="reference internal" href="boot-interrupts.html#more-documentation">11.6. More Documentation</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="tph.html">12. TPH Support</a><ul>
<li class="toctree-l2"><a class="reference internal" href="tph.html#overview">12.1. Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="tph.html#how-to-use-tph">12.2. How to Use TPH</a></li>
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