Re: [Patch v1 2/3] ACPI, PCI: reuse ACPI hotplug framework to support PCI host bridge hotplug

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On Fri, Jan 17, 2014 at 6:48 PM, Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx> wrote:
> Reuse ACPI hotplug framework to support PCI host bridge hotplug, this
> makes PCI host bridge hotplug implementation simpler and more clear.
>
> It also fixes a bug in support of PCI host bridge hot-addition.
> Currently pci_root driver fails to install notification handler for
> PCI host bridge absent at boot time because acpi_is_root_bridge()
> returns false if no ACPI device created for handle. So PCI host
> bridge hot-addition event will just be ignored by system.
>
> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>

is the same as

commit 3338db0057ed9f554050bd06863731c515d79672
Author: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Date:   Fri Nov 22 21:55:20 2013 +0100

    ACPI / hotplug: Make ACPI PCI root hotplug use common hotplug code

in rafael tree pm/linux-next for 3.14?

> ---
>  drivers/acpi/internal.h |    1 -
>  drivers/acpi/pci_root.c |  117 +++++++----------------------------------------
>  drivers/acpi/scan.c     |    2 -
>  3 files changed, 17 insertions(+), 103 deletions(-)
>
> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> index a29739c..03efa56 100644
> --- a/drivers/acpi/internal.h
> +++ b/drivers/acpi/internal.h
> @@ -28,7 +28,6 @@ int init_acpi_device_notify(void);
>  int acpi_scan_init(void);
>  void acpi_pci_root_init(void);
>  void acpi_pci_link_init(void);
> -void acpi_pci_root_hp_init(void);
>  void acpi_processor_init(void);
>  void acpi_platform_init(void);
>  int acpi_sysfs_init(void);
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index 20360e4..6f6e6c1 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -50,6 +50,7 @@ ACPI_MODULE_NAME("pci_root");
>  static int acpi_pci_root_add(struct acpi_device *device,
>                              const struct acpi_device_id *not_used);
>  static void acpi_pci_root_remove(struct acpi_device *device);
> +static int handle_hotplug_event_root(acpi_handle handle, u32 type, void *ctx);
>
>  #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \
>                                 | OSC_PCI_ASPM_SUPPORT \
> @@ -61,12 +62,14 @@ static const struct acpi_device_id root_device_ids[] = {
>         {"", 0},
>  };
>
> +
>  static struct acpi_scan_handler pci_root_handler = {
>         .ids = root_device_ids,
> +       .prepare = handle_hotplug_event_root,
>         .attach = acpi_pci_root_add,
>         .detach = acpi_pci_root_remove,
>         .hotplug = {
> -               .ignore = true,
> +               .enabled = true,
>         },
>  };
>
> @@ -627,113 +630,27 @@ void __init acpi_pci_root_init(void)
>
>         if (!acpi_pci_disabled) {
>                 pci_acpi_crs_quirks();
> -               acpi_scan_add_handler(&pci_root_handler);
> -       }
> -}
> -/* Support root bridge hotplug */
> -
> -static void handle_root_bridge_insertion(acpi_handle handle)
> -{
> -       struct acpi_device *device;
> -
> -       if (!acpi_bus_get_device(handle, &device)) {
> -               dev_printk(KERN_DEBUG, &device->dev,
> -                          "acpi device already exists; ignoring notify\n");
> -               return;
> +               acpi_scan_add_handler_with_hotplug(&pci_root_handler,
> +                                                  "pci_hostbridge");
>         }
> -
> -       if (acpi_bus_scan(handle))
> -               acpi_handle_err(handle, "cannot add bridge to acpi list\n");
>  }
>
> -static void hotplug_event_root(void *data, u32 type)
> +static int handle_hotplug_event_root(acpi_handle handle, u32 type, void *ctx)
>  {
> -       acpi_handle handle = data;
> +       int ret = NOTIFY_OK;
>         struct acpi_pci_root *root;
>
> -       acpi_scan_lock_acquire();
> -
> -       root = acpi_pci_find_root(handle);
> -
> -       switch (type) {
> -       case ACPI_NOTIFY_BUS_CHECK:
> -               /* bus enumerate */
> -               acpi_handle_printk(KERN_DEBUG, handle,
> -                                  "Bus check notify on %s\n", __func__);
> -               if (root)
> +       if (type == ACPI_NOTIFY_BUS_CHECK) {
> +               acpi_scan_lock_acquire();
> +               root = acpi_pci_find_root(handle);
> +               if (root) {
> +                       acpi_handle_printk(KERN_DEBUG, handle,
> +                               "Bus check notify on %s\n", __func__);
>                         acpiphp_check_host_bridge(handle);
> -               else
> -                       handle_root_bridge_insertion(handle);
> -
> -               break;
> -
> -       case ACPI_NOTIFY_DEVICE_CHECK:
> -               /* device check */
> -               acpi_handle_printk(KERN_DEBUG, handle,
> -                                  "Device check notify on %s\n", __func__);
> -               if (!root)
> -                       handle_root_bridge_insertion(handle);
> -               break;
> -
> -       case ACPI_NOTIFY_EJECT_REQUEST:
> -               /* request device eject */
> -               acpi_handle_printk(KERN_DEBUG, handle,
> -                                  "Device eject notify on %s\n", __func__);
> -               if (!root)
> -                       break;
> -
> -               get_device(&root->device->dev);
> -
> +                       ret = NOTIFY_STOP;
> +               }
>                 acpi_scan_lock_release();
> -
> -               acpi_bus_device_eject(root->device, ACPI_NOTIFY_EJECT_REQUEST);
> -               return;
> -       default:
> -               acpi_handle_warn(handle,
> -                                "notify_handler: unknown event type 0x%x\n",
> -                                type);
> -               break;
>         }
>
> -       acpi_scan_lock_release();
> -}
> -
> -static void handle_hotplug_event_root(acpi_handle handle, u32 type,
> -                                       void *context)
> -{
> -       acpi_hotplug_execute(hotplug_event_root, handle, type);
> -}
> -
> -static acpi_status __init
> -find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
> -{
> -       acpi_status status;
> -       int *count = (int *)context;
> -
> -       if (!acpi_is_root_bridge(handle))
> -               return AE_OK;
> -
> -       (*count)++;
> -
> -       status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
> -                                       handle_hotplug_event_root, NULL);
> -       if (ACPI_FAILURE(status))
> -               acpi_handle_printk(KERN_DEBUG, handle,
> -                       "notify handler is not installed, exit status: %u\n",
> -                        (unsigned int)status);
> -       else
> -               acpi_handle_printk(KERN_DEBUG, handle,
> -                                  "notify handler is installed\n");
> -
> -       return AE_OK;
> -}
> -
> -void __init acpi_pci_root_hp_init(void)
> -{
> -       int num = 0;
> -
> -       acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
> -               ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
> -
> -       printk(KERN_DEBUG "Found %d acpi root devices\n", num);
> +       return ret;
>  }
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 6b0f419..d83e0ff 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -2057,8 +2057,6 @@ int __init acpi_scan_init(void)
>
>         acpi_update_all_gpes();
>
> -       acpi_pci_root_hp_init();
> -
>   out:
>         mutex_unlock(&acpi_scan_lock);
>         return result;
> --
> 1.7.10.4
>
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