1. 14 1月, 2013 1 次提交
    • R
      ACPI / PCI: Set root bridge ACPI handle in advance · 6c0cc950
      Rafael J. Wysocki 提交于
      The ACPI handles of PCI root bridges need to be known to
      acpi_bind_one(), so that it can create the appropriate
      "firmware_node" and "physical_node" files for them, but currently
      the way it gets to know those handles is not exactly straightforward
      (to put it lightly).
      
      This is how it works, roughly:
      
        1. acpi_bus_scan() finds the handle of a PCI root bridge,
           creates a struct acpi_device object for it and passes that
           object to acpi_pci_root_add().
      
        2. acpi_pci_root_add() creates a struct acpi_pci_root object,
           populates its "device" field with its argument's address
           (device->handle is the ACPI handle found in step 1).
      
        3. The struct acpi_pci_root object created in step 2 is passed
           to pci_acpi_scan_root() and used to get resources that are
           passed to pci_create_root_bus().
      
        4. pci_create_root_bus() creates a struct pci_host_bridge object
           and passes its "dev" member to device_register().
      
        5. platform_notify(), which for systems with ACPI is set to
           acpi_platform_notify(), is called.
      
      So far, so good.  Now it starts to be "interesting".
      
        6. acpi_find_bridge_device() is used to find the ACPI handle of
           the given device (which is the PCI root bridge) and executes
           acpi_pci_find_root_bridge(), among other things, for the
           given device object.
      
        7. acpi_pci_find_root_bridge() uses the name (sic!) of the given
           device object to extract the segment and bus numbers of the PCI
           root bridge and passes them to acpi_get_pci_rootbridge_handle().
      
        8. acpi_get_pci_rootbridge_handle() browses the list of ACPI PCI
           root bridges and finds the one that matches the given segment
           and bus numbers.  Its handle is then used to initialize the
           ACPI handle of the PCI root bridge's device object by
           acpi_bind_one().  However, this is *exactly* the ACPI handle we
           started with in step 1.
      
      Needless to say, this is quite embarassing, but it may be avoided
      thanks to commit f3fd0c8a (ACPI: Allow ACPI handles of devices to be
      initialized in advance), which makes it possible to initialize the
      ACPI handle of a device before passing it to device_register().
      
      Accordingly, add a new __weak routine, pcibios_root_bridge_prepare(),
      defaulting to an empty implementation that can be replaced by the
      interested architecutres (x86 and ia64 at the moment) with functions
      that will set the root bridge's ACPI handle before its dev member is
      passed to device_register().  Make both x86 and ia64 provide such
      implementations of pcibios_root_bridge_prepare() and remove
      acpi_pci_find_root_bridge() and acpi_get_pci_rootbridge_handle() that
      aren't necessary any more.
      
      Included is a fix for breakage on systems with non-ACPI PCI host
      bridges from Bjorn Helgaas.
      Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
      Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
      6c0cc950
  2. 11 1月, 2013 1 次提交
    • B
      Merge branch 'acpi-scan' of... · 295a7f62
      Bjorn Helgaas 提交于
      Merge branch 'acpi-scan' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm into pci/yinghai-survey-resources+acpi-scan
      
      * 'acpi-scan' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
        ACPI / scan: Treat power resources in a special way
        ACPI: Remove unused struct acpi_pci_root.id member
        ACPI: Drop ACPI device .bind() and .unbind() callbacks
        ACPI / PCI: Move the _PRT setup and cleanup code to pci-acpi.c
        ACPI / PCI: Rework the setup and cleanup of device wakeup
        ACPI: Add .setup() and .cleanup() callbacks to struct acpi_bus_type
        ACPI: Make acpi_bus_scan() and acpi_bus_add() take only one argument
        ACPI: Replace ACPI device add_type field with a match_driver flag
        ACPI: Drop the second argument of acpi_bus_scan()
        ACPI: Remove the arguments of acpi_bus_add() that are not used
        ACPI: Remove acpi_start_single_object() and acpi_bus_start()
        ACPI / PCI: Fold acpi_pci_root_start() into acpi_pci_root_add()
        ACPI: Change the ordering of acpi_bus_check_add()
        ACPI: Replace struct acpi_bus_ops with enum type
        ACPI: Reduce the usage of struct acpi_bus_ops
        ACPI: Make acpi_bus_add() and acpi_bus_start() visibly different
        ACPI: Change the ordering of PCI root bridge driver registrarion
        ACPI: Separate adding ACPI device objects from probing ACPI drivers
      
      Conflicts:
      	drivers/acpi/pci_root.c
      295a7f62
  3. 08 1月, 2013 9 次提交
  4. 03 1月, 2013 29 次提交
新手
引导
客服 返回
顶部