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Date: Fri, 17 Jan 2014 19:23:33 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Toshi Kani <toshi.kani@...com>,
Yijing Wang <wangyijing@...wei.com>,
Len Brown <lenb@...nel.org>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Patch v1 2/3] ACPI, PCI: reuse ACPI hotplug framework to support
PCI host bridge hotplug
On Fri, Jan 17, 2014 at 6:48 PM, Jiang Liu <jiang.liu@...ux.intel.com> 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@...ux.intel.com>
is the same as
commit 3338db0057ed9f554050bd06863731c515d79672
Author: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
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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