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5 The PCI Express Port Bus Driver Guide HOWTO
14 This guide describes the basics of the PCI Express Port Bus driver
16 register/unregister with the PCI Express Port Bus Driver.
19 What is the PCI Express Port Bus Driver
22 A PCI Express Port is a logical PCI-PCI Bridge structure. There
23 are two types of PCI Express Port: the Root Port and the Switch
24 Port. The Root Port originates a PCI Express link from a PCI Express
25 Root Complex and the Switch Port connects PCI Express links to
26 internal logical PCI buses. The Switch Port, which has its secondary
30 PCI Express link from the PCI Express Switch.
32 A PCI Express Port can provide up to four distinct functions,
34 PCI Express Port's services include native hotplug support (HP),
40 Why use the PCI Express Port Bus Driver?
44 physical device to be handled by only a single driver. The PCI
45 Express Port is a PCI-PCI Bridge device with multiple distinct
48 service drivers will compete for a single PCI-PCI Bridge device.
49 For example, if the PCI Express Root Port native hotplug service
50 driver is loaded first, it claims a PCI-PCI Bridge Root Port. The
53 drivers load and run on a PCI-PCI Bridge device simultaneously
57 having a PCI Express Port Bus driver, which manages all populated
58 PCI Express Ports and distributes all provided service requests
60 advantages of using the PCI Express Port Bus driver are listed below:
63     a PCI-PCI Bridge Port device.
68   - Allow one service driver to run on multiple PCI-PCI Bridge
71   - Manage and distribute resources of a PCI-PCI Bridge Port
74 Configuring the PCI Express Port Bus Driver vs. Service Drivers
77 Including the PCI Express Port Bus Driver Support into the Kernel
80 Including the PCI Express Port Bus driver depends on whether the PCI
82 automatically include the PCI Express Port Bus driver as a kernel
83 driver when the PCI Express support is enabled in the kernel.
88 PCI device drivers are implemented based on Linux Device Driver Model.
89 All service drivers are PCI device drivers. As discussed above, it is
91 PCI Express Port Bus Driver. To meet the PCI Express Port Bus Driver
96 register its service with the PCI Express Port Bus driver (see
101 the PCI Express Port Bus driver from loading a service driver.
113 necessary since these calls are executed by the PCI Port Bus driver.
179 Since all service drivers of a PCI-PCI Bridge Port device are
188 PCI-PCI Bridge port share the same physical device, if an individual
193 switch interrupt mode on its device. The PCI Express Port Bus driver
197 is passed in when the PCI Express Port Bus driver probes each service
202 PCI Memory/IO Mapped Regions
205 Service drivers for PCI Express Power Management (PME), Advanced
207 PCI configuration space on the PCI Express port. In all cases the
212 PCI Config Registers
215 Each service driver runs its PCI config operations on its own
216 capability structure except the PCI Express capability structure,
220 a selected set of PCI Express Capability Registers (Link Control