diff options
Diffstat (limited to 'Documentation/PCI/pciebus-howto.rst')
| -rw-r--r-- | Documentation/PCI/pciebus-howto.rst | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/Documentation/PCI/pciebus-howto.rst b/Documentation/PCI/pciebus-howto.rst index f882ff62c51f..375d9ce171f6 100644 --- a/Documentation/PCI/pciebus-howto.rst +++ b/Documentation/PCI/pciebus-howto.rst @@ -139,7 +139,7 @@ driver data structure. static struct pcie_port_service_driver root_aerdrv = { .name = (char *)device_name, - .id_table = &service_id[0], + .id_table = service_id, .probe = aerdrv_load, .remove = aerdrv_unload, @@ -213,8 +213,16 @@ 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 +* Root Control Register +* Link Control 2 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(). |