Patchwork [2/2] acpiphp: remove dead code for PCI host bridge hotplug

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Submitter Jiang Liu
Date Jan. 30, 2013, 4:10 p.m.
Message ID <1359562210-26536-2-git-send-email-jiang.liu@huawei.com>
Download mbox | patch
Permalink /patch/216941/
State Accepted
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Comments

Jiang Liu - Jan. 30, 2013, 4:10 p.m.
From: Jiang Liu <jiang.liu@huawei.com>

Commit 668192b678201d2fff27c "PCI: acpiphp: Move host bridge hotplug
to pci_root.c" has moved PCI host bridge hotplug logic from acpiphp
to pci_root, but there is still PCI host bridge hotplug related
dead code left in acpiphp. So remove those dead code.

Now companion ACPI devices are always created before corresponding
PCI devices. And the ACPI event handle_hotplug_event_bridge() will be
installed only if it has associated PCI device. So remove dead code to
handle bridge hot-adding in function handle_hotplug_event_bridge().

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
---
 drivers/pci/hotplug/acpiphp.h      |   13 +---
 drivers/pci/hotplug/acpiphp_glue.c |  124 ++++--------------------------------
 2 files changed, 14 insertions(+), 123 deletions(-)
Yinghai Lu - Jan. 30, 2013, 5:27 p.m.
On Wed, Jan 30, 2013 at 8:10 AM, Jiang Liu <liuj97@gmail.com> wrote:
> From: Jiang Liu <jiang.liu@huawei.com>
>
> Commit 668192b678201d2fff27c "PCI: acpiphp: Move host bridge hotplug
> to pci_root.c" has moved PCI host bridge hotplug logic from acpiphp
> to pci_root, but there is still PCI host bridge hotplug related
> dead code left in acpiphp. So remove those dead code.
>
> Now companion ACPI devices are always created before corresponding
> PCI devices. And the ACPI event handle_hotplug_event_bridge() will be
> installed only if it has associated PCI device. So remove dead code to
> handle bridge hot-adding in function handle_hotplug_event_bridge().
>
> Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
> ---
>  drivers/pci/hotplug/acpiphp.h      |   13 +---
>  drivers/pci/hotplug/acpiphp_glue.c |  124 ++++--------------------------------
>  2 files changed, 14 insertions(+), 123 deletions(-)
>
> diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h
> index b3ead7a..b70ac00 100644
> --- a/drivers/pci/hotplug/acpiphp.h
> +++ b/drivers/pci/hotplug/acpiphp.h
> @@ -79,7 +79,6 @@ struct acpiphp_bridge {
>         /* Ejectable PCI-to-PCI bridge (PCI bridge and PCI function) */
>         struct acpiphp_func *func;
>
> -       int type;
>         int nr_slots;
>
>         u32 flags;
> @@ -146,10 +145,6 @@ struct acpiphp_attention_info
>  /* PCI bus bridge HID */
>  #define ACPI_PCI_HOST_HID              "PNP0A03"
>
> -/* PCI BRIDGE type */
> -#define BRIDGE_TYPE_HOST               0
> -#define BRIDGE_TYPE_P2P                        1
> -
>  /* ACPI _STA method value (ignore bit 4; battery present) */
>  #define ACPI_STA_PRESENT               (0x00000001)
>  #define ACPI_STA_ENABLED               (0x00000002)
> @@ -158,13 +153,7 @@ struct acpiphp_attention_info
>  #define ACPI_STA_ALL                   (0x0000000f)
>
>  /* bridge flags */
> -#define BRIDGE_HAS_STA         (0x00000001)
> -#define BRIDGE_HAS_EJ0         (0x00000002)
> -#define BRIDGE_HAS_HPP         (0x00000004)
> -#define BRIDGE_HAS_PS0         (0x00000010)
> -#define BRIDGE_HAS_PS1         (0x00000020)
> -#define BRIDGE_HAS_PS2         (0x00000040)
> -#define BRIDGE_HAS_PS3         (0x00000080)
> +#define BRIDGE_HAS_EJ0         (0x00000001)
>
>  /* slot flags */
>
> diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
> index acb7af2..4681d2c 100644
> --- a/drivers/pci/hotplug/acpiphp_glue.c
> +++ b/drivers/pci/hotplug/acpiphp_glue.c
> @@ -325,8 +325,8 @@ static void init_bridge_misc(struct acpiphp_bridge *bridge)
>                 return;
>         }
>
> -       /* install notify handler */
> -       if (bridge->type != BRIDGE_TYPE_HOST) {
> +       /* install notify handler for P2P bridges */
> +       if (!pci_is_root_bus(bridge->pci_bus)) {
>                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
>                         status = acpi_remove_notify_handler(bridge->func->handle,
>                                                 ACPI_SYSTEM_NOTIFY,
> @@ -369,27 +369,12 @@ static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle
>  static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
>  {
>         acpi_handle dummy_handle;
> +       struct acpiphp_func *func;
>
>         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
> -                                       "_STA", &dummy_handle)))
> -               bridge->flags |= BRIDGE_HAS_STA;
> -
> -       if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
> -                                       "_EJ0", &dummy_handle)))
> +                                       "_EJ0", &dummy_handle))) {
>                 bridge->flags |= BRIDGE_HAS_EJ0;
>
> -       if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
> -                                       "_PS0", &dummy_handle)))
> -               bridge->flags |= BRIDGE_HAS_PS0;
> -
> -       if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
> -                                       "_PS3", &dummy_handle)))
> -               bridge->flags |= BRIDGE_HAS_PS3;
> -
> -       /* is this ejectable p2p bridge? */
> -       if (bridge->flags & BRIDGE_HAS_EJ0) {
> -               struct acpiphp_func *func;
> -
>                 dbg("found ejectable p2p bridge\n");
>
>                 /* make link between PCI bridge and PCI function */
> @@ -412,7 +397,6 @@ static void add_host_bridge(struct acpi_pci_root *root)
>         if (bridge == NULL)
>                 return;
>
> -       bridge->type = BRIDGE_TYPE_HOST;
>         bridge->handle = handle;
>
>         bridge->pci_bus = root->bus;
> @@ -432,7 +416,6 @@ static void add_p2p_bridge(acpi_handle *handle)
>                 return;
>         }
>
> -       bridge->type = BRIDGE_TYPE_P2P;
>         bridge->handle = handle;
>         config_p2p_bridge_flags(bridge);
>
> @@ -543,7 +526,7 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
>         acpi_status status;
>         acpi_handle handle = bridge->handle;
>
> -       if (bridge->type != BRIDGE_TYPE_HOST) {
> +       if (!pci_is_root_bus(bridge->pci_bus)) {
>                 status = acpi_remove_notify_handler(handle,
>                                             ACPI_SYSTEM_NOTIFY,
>                                             handle_hotplug_event_bridge);
> @@ -551,8 +534,7 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
>                         err("failed to remove notify handler\n");
>         }
>
> -       if ((bridge->type != BRIDGE_TYPE_HOST) &&
> -           ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
> +       if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
>                 status = acpi_install_notify_handler(bridge->func->handle,
>                                                 ACPI_SYSTEM_NOTIFY,
>                                                 handle_hotplug_event_func,
> @@ -1122,64 +1104,11 @@ static void acpiphp_sanitize_bus(struct pci_bus *bus)
>         }
>  }
>
> -/* Program resources in newly inserted bridge */
> -static int acpiphp_configure_p2p_bridge(acpi_handle handle)
> -{
> -       struct pci_dev *pdev = acpi_get_pci_dev(handle);
> -       struct pci_bus *bus = pdev->subordinate;
> -
> -       pci_dev_put(pdev);
> -
> -       pci_bus_size_bridges(bus);
> -       pci_bus_assign_resources(bus);
> -       acpiphp_sanitize_bus(bus);
> -       acpiphp_set_hpp_values(bus);
> -       pci_enable_bridges(bus);
> -       return 0;
> -}
> -
> -static void handle_p2p_bridge_insertion(acpi_handle handle, u32 type)
> -{
> -       struct acpi_device *device;
> -
> -       if ((type != ACPI_NOTIFY_BUS_CHECK) &&
> -                       (type != ACPI_NOTIFY_DEVICE_CHECK)) {
> -               err("unexpected notification type %d\n", type);
> -               return;
> -       }
> -
> -       if (acpi_bus_scan(handle)) {
> -               err("cannot add bridge to acpi list\n");
> -               return;
> -       }
> -       if (acpi_bus_get_device(handle, &device)) {
> -               err("ACPI device object missing\n");
> -               return;
> -       }
> -       if (!acpiphp_configure_p2p_bridge(handle))
> -               add_p2p_bridge(handle);
> -       else
> -               err("cannot configure and start bridge\n");
> -
> -}
> -
>  /*
>   * ACPI event handlers
>   */
>
>  static acpi_status
> -count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
> -{
> -       int *count = (int *)context;
> -       struct acpiphp_bridge *bridge;
> -
> -       bridge = acpiphp_handle_to_bridge(handle);
> -       if (bridge)
> -               (*count)++;
> -       return AE_OK ;
> -}
> -
> -static acpi_status
>  check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
>  {
>         struct acpiphp_bridge *bridge;
> @@ -1203,8 +1132,6 @@ static void _handle_hotplug_event_bridge(struct work_struct *work)
>         char objname[64];
>         struct acpi_buffer buffer = { .length = sizeof(objname),
>                                       .pointer = objname };
> -       struct acpi_device *device;
> -       int num_sub_bridges = 0;
>         struct acpi_hp_work *hp_work;
>         acpi_handle handle;
>         u32 type;
> @@ -1212,23 +1139,7 @@ static void _handle_hotplug_event_bridge(struct work_struct *work)
>         hp_work = container_of(work, struct acpi_hp_work, work);
>         handle = hp_work->handle;
>         type = hp_work->type;
> -
> -       if (acpi_bus_get_device(handle, &device)) {
> -               /* This bridge must have just been physically inserted */
> -               handle_p2p_bridge_insertion(handle, type);
> -               goto out;
> -       }

According to my understanding, for acpiphp we still need to support:

one slot is on root bus 0, and will take p2p bridge directly.

I thought that I pointed this out when Yijing Wang or someone else
pose similar patch.

Thanks

Yinghai
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Jiang Liu - Jan. 31, 2013, 3:37 p.m.
On 01/31/2013 01:27 AM, Yinghai Lu wrote:
> On Wed, Jan 30, 2013 at 8:10 AM, Jiang Liu <liuj97@gmail.com> wrote:
>> From: Jiang Liu <jiang.liu@huawei.com>
>>
>> Commit 668192b678201d2fff27c "PCI: acpiphp: Move host bridge hotplug
>> to pci_root.c" has moved PCI host bridge hotplug logic from acpiphp
>> to pci_root, but there is still PCI host bridge hotplug related
>> dead code left in acpiphp. So remove those dead code.
>>
>> Now companion ACPI devices are always created before corresponding
>> PCI devices. And the ACPI event handle_hotplug_event_bridge() will be
>> installed only if it has associated PCI device. So remove dead code to
>> handle bridge hot-adding in function handle_hotplug_event_bridge().
>>
>> Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
>> ---
>>  drivers/pci/hotplug/acpiphp.h      |   13 +---
>>  drivers/pci/hotplug/acpiphp_glue.c |  124 ++++--------------------------------
>>  2 files changed, 14 insertions(+), 123 deletions(-)
>>
>> diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h
>> index b3ead7a..b70ac00 100644
>> --- a/drivers/pci/hotplug/acpiphp.h
>> +++ b/drivers/pci/hotplug/acpiphp.h
>> @@ -79,7 +79,6 @@ struct acpiphp_bridge {
>>         /* Ejectable PCI-to-PCI bridge (PCI bridge and PCI function) */
>>         struct acpiphp_func *func;
>>
>> -       int type;
>>         int nr_slots;
>>
>>         u32 flags;
>> @@ -146,10 +145,6 @@ struct acpiphp_attention_info
>>  /* PCI bus bridge HID */
>>  #define ACPI_PCI_HOST_HID              "PNP0A03"
>>
>> -/* PCI BRIDGE type */
>> -#define BRIDGE_TYPE_HOST               0
>> -#define BRIDGE_TYPE_P2P                        1
>> -
>>  /* ACPI _STA method value (ignore bit 4; battery present) */
>>  #define ACPI_STA_PRESENT               (0x00000001)
>>  #define ACPI_STA_ENABLED               (0x00000002)
>> @@ -158,13 +153,7 @@ struct acpiphp_attention_info
>>  #define ACPI_STA_ALL                   (0x0000000f)
>>
>>  /* bridge flags */
>> -#define BRIDGE_HAS_STA         (0x00000001)
>> -#define BRIDGE_HAS_EJ0         (0x00000002)
>> -#define BRIDGE_HAS_HPP         (0x00000004)
>> -#define BRIDGE_HAS_PS0         (0x00000010)
>> -#define BRIDGE_HAS_PS1         (0x00000020)
>> -#define BRIDGE_HAS_PS2         (0x00000040)
>> -#define BRIDGE_HAS_PS3         (0x00000080)
>> +#define BRIDGE_HAS_EJ0         (0x00000001)
>>
>>  /* slot flags */
>>
>> diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
>> index acb7af2..4681d2c 100644
>> --- a/drivers/pci/hotplug/acpiphp_glue.c
>> +++ b/drivers/pci/hotplug/acpiphp_glue.c
>> @@ -325,8 +325,8 @@ static void init_bridge_misc(struct acpiphp_bridge *bridge)
>>                 return;
>>         }
>>
>> -       /* install notify handler */
>> -       if (bridge->type != BRIDGE_TYPE_HOST) {
>> +       /* install notify handler for P2P bridges */
>> +       if (!pci_is_root_bus(bridge->pci_bus)) {
>>                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
>>                         status = acpi_remove_notify_handler(bridge->func->handle,
>>                                                 ACPI_SYSTEM_NOTIFY,
>> @@ -369,27 +369,12 @@ static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle
>>  static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
>>  {
>>         acpi_handle dummy_handle;
>> +       struct acpiphp_func *func;
>>
>>         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
>> -                                       "_STA", &dummy_handle)))
>> -               bridge->flags |= BRIDGE_HAS_STA;
>> -
>> -       if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
>> -                                       "_EJ0", &dummy_handle)))
>> +                                       "_EJ0", &dummy_handle))) {
>>                 bridge->flags |= BRIDGE_HAS_EJ0;
>>
>> -       if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
>> -                                       "_PS0", &dummy_handle)))
>> -               bridge->flags |= BRIDGE_HAS_PS0;
>> -
>> -       if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
>> -                                       "_PS3", &dummy_handle)))
>> -               bridge->flags |= BRIDGE_HAS_PS3;
>> -
>> -       /* is this ejectable p2p bridge? */
>> -       if (bridge->flags & BRIDGE_HAS_EJ0) {
>> -               struct acpiphp_func *func;
>> -
>>                 dbg("found ejectable p2p bridge\n");
>>
>>                 /* make link between PCI bridge and PCI function */
>> @@ -412,7 +397,6 @@ static void add_host_bridge(struct acpi_pci_root *root)
>>         if (bridge == NULL)
>>                 return;
>>
>> -       bridge->type = BRIDGE_TYPE_HOST;
>>         bridge->handle = handle;
>>
>>         bridge->pci_bus = root->bus;
>> @@ -432,7 +416,6 @@ static void add_p2p_bridge(acpi_handle *handle)
>>                 return;
>>         }
>>
>> -       bridge->type = BRIDGE_TYPE_P2P;
>>         bridge->handle = handle;
>>         config_p2p_bridge_flags(bridge);
>>
>> @@ -543,7 +526,7 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
>>         acpi_status status;
>>         acpi_handle handle = bridge->handle;
>>
>> -       if (bridge->type != BRIDGE_TYPE_HOST) {
>> +       if (!pci_is_root_bus(bridge->pci_bus)) {
>>                 status = acpi_remove_notify_handler(handle,
>>                                             ACPI_SYSTEM_NOTIFY,
>>                                             handle_hotplug_event_bridge);
>> @@ -551,8 +534,7 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
>>                         err("failed to remove notify handler\n");
>>         }
>>
>> -       if ((bridge->type != BRIDGE_TYPE_HOST) &&
>> -           ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
>> +       if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
>>                 status = acpi_install_notify_handler(bridge->func->handle,
>>                                                 ACPI_SYSTEM_NOTIFY,
>>                                                 handle_hotplug_event_func,
>> @@ -1122,64 +1104,11 @@ static void acpiphp_sanitize_bus(struct pci_bus *bus)
>>         }
>>  }
>>
>> -/* Program resources in newly inserted bridge */
>> -static int acpiphp_configure_p2p_bridge(acpi_handle handle)
>> -{
>> -       struct pci_dev *pdev = acpi_get_pci_dev(handle);
>> -       struct pci_bus *bus = pdev->subordinate;
>> -
>> -       pci_dev_put(pdev);
>> -
>> -       pci_bus_size_bridges(bus);
>> -       pci_bus_assign_resources(bus);
>> -       acpiphp_sanitize_bus(bus);
>> -       acpiphp_set_hpp_values(bus);
>> -       pci_enable_bridges(bus);
>> -       return 0;
>> -}
>> -
>> -static void handle_p2p_bridge_insertion(acpi_handle handle, u32 type)
>> -{
>> -       struct acpi_device *device;
>> -
>> -       if ((type != ACPI_NOTIFY_BUS_CHECK) &&
>> -                       (type != ACPI_NOTIFY_DEVICE_CHECK)) {
>> -               err("unexpected notification type %d\n", type);
>> -               return;
>> -       }
>> -
>> -       if (acpi_bus_scan(handle)) {
>> -               err("cannot add bridge to acpi list\n");
>> -               return;
>> -       }
>> -       if (acpi_bus_get_device(handle, &device)) {
>> -               err("ACPI device object missing\n");
>> -               return;
>> -       }
>> -       if (!acpiphp_configure_p2p_bridge(handle))
>> -               add_p2p_bridge(handle);
>> -       else
>> -               err("cannot configure and start bridge\n");
>> -
>> -}
>> -
>>  /*
>>   * ACPI event handlers
>>   */
>>
>>  static acpi_status
>> -count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
>> -{
>> -       int *count = (int *)context;
>> -       struct acpiphp_bridge *bridge;
>> -
>> -       bridge = acpiphp_handle_to_bridge(handle);
>> -       if (bridge)
>> -               (*count)++;
>> -       return AE_OK ;
>> -}
>> -
>> -static acpi_status
>>  check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
>>  {
>>         struct acpiphp_bridge *bridge;
>> @@ -1203,8 +1132,6 @@ static void _handle_hotplug_event_bridge(struct work_struct *work)
>>         char objname[64];
>>         struct acpi_buffer buffer = { .length = sizeof(objname),
>>                                       .pointer = objname };
>> -       struct acpi_device *device;
>> -       int num_sub_bridges = 0;
>>         struct acpi_hp_work *hp_work;
>>         acpi_handle handle;
>>         u32 type;
>> @@ -1212,23 +1139,7 @@ static void _handle_hotplug_event_bridge(struct work_struct *work)
>>         hp_work = container_of(work, struct acpi_hp_work, work);
>>         handle = hp_work->handle;
>>         type = hp_work->type;
>> -
>> -       if (acpi_bus_get_device(handle, &device)) {
>> -               /* This bridge must have just been physically inserted */
>> -               handle_p2p_bridge_insertion(handle, type);
>> -               goto out;
>> -       }
> 
> According to my understanding, for acpiphp we still need to support:
> 
> one slot is on root bus 0, and will take p2p bridge directly.

Hi Yinghai,
	I think the acpiphp driver still supports PCI hotplug slots directly attached
to PCI host bridges with the patch applied. The situations are:
1) The acpiphp driver won't install ACPI system event handler onto ACPI handles for
   PCI/PCIe host bridges, otherwise it will conflict with the PCI host bridge hotplug
   driver.
2) If there's no PCI device attached to a PCI hotplug slot or the attached PCI device
   is not a P2P bridge, acpiphp installs handle_hotplug_event_func() to handle ACPI
   system events. Otherwise handle_hotplug_event_bridge() will be installed.
3) When hot-adding a P2P bridge, acpiphp replaces handle_hotplug_event_func() with
   handle_hotplug_event_bridge(), so hot-removal of P2P bridge will be handled by 
   handle_hotplug_event_bridge().
4) When hot-removing a P2P bridge, acpi replaces handle_hotplug_event_bridge() with
   handle_hotplug_event_func(). So P2P bridge hot-add will always be handled by 
   handle_hotplug_event_func() instead of handle_hotplug_event_bridge()
5) The acpiphp driver still scans for hotplug slots directly attached to PCI host
   bridges.

So I think the code in handle_hotplug_event_bridge() to handle P2P hot-addition
is dead. Yijing has helped to test the code by faking ACPI CUSTOM_METHOD, and it
does work as expected.

Regards!
Gerry 

> 
> I thought that I pointed this out when Yijing Wang or someone else
> pose similar patch.
> 
> Thanks
> 
> Yinghai
> 

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Yinghai Lu - Jan. 31, 2013, 3:59 p.m.
On Thu, Jan 31, 2013 at 7:37 AM, Jiang Liu <liuj97@gmail.com> wrote:
>
> So I think the code in handle_hotplug_event_bridge() to handle P2P hot-addition
> is dead. Yijing has helped to test the code by faking ACPI CUSTOM_METHOD, and it
> does work as expected.

ok, then.

It would be better if you can append some print out from Yijing's test
in the changelog.

Thanks

Yinghai
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Yijing Wang - Feb. 1, 2013, 8:50 a.m.
On 2013/1/31 23:59, Yinghai Lu wrote:
> On Thu, Jan 31, 2013 at 7:37 AM, Jiang Liu <liuj97@gmail.com> wrote:
>>
>> So I think the code in handle_hotplug_event_bridge() to handle P2P hot-addition
>> is dead. Yijing has helped to test the code by faking ACPI CUSTOM_METHOD, and it
>> does work as expected.
> 
> ok, then.
> 
> It would be better if you can append some print out from Yijing's test
> in the changelog.
> 

Hi Yinghai,
   I used custom_method module to make root port device 0000:00:07.0 support acpi hotplug (by adding _EJ0 method),
This root port device also connected to a slot which support hotplug. I tested to hot plug root port device 0000:00:07.0,
and test steps and info as bellow, if there are somethings missing during test, please let me know.
Thanks very much!

linux-ha2:/sys/bus/pci/slots # lspci -tv
-+-[0000:40]-+-00.0-[0000:41]--
 |           +-01.0-[0000:42]--+-00.0  Intel Corporation 82576 Gigabit Network Connection
 |           |                 \-00.1  Intel Corporation 82576 Gigabit Network Connection
 |           +-03.0-[0000:43]----00.0  LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS
 |           +-04.0-[0000:44]--
 |           +-05.0-[0000:45]--
 |           +-07.0-[0000:46]--
 |           +-0d.0  Intel Corporation Device 343a
 |           +-0d.1  Intel Corporation Device 343b
 |           +-0d.2  Intel Corporation Device 343c
 |           +-0d.3  Intel Corporation Device 343d
 |           +-0d.4  Intel Corporation 5520/5500/X58 Physical Layer Port 0
 |           +-0d.5  Intel Corporation 5520/5500 Physical Layer Port 1
 |           +-0d.6  Intel Corporation Device 341a
 |           +-0d.7  Intel Corporation Device 341b
 |           +-0e.0  Intel Corporation Device 341c
 |           +-0e.1  Intel Corporation Device 341d
 |           +-0e.2  Intel Corporation Device 341e
 |           +-0e.3  Intel Corporation Device 341f
 |           +-0e.4  Intel Corporation Device 3439
 |           +-0f.0  Intel Corporation Device 3424
 |           +-10.0  Intel Corporation 5520/5500/X58 Physical and Link Layer Registers Port 0
 |           +-10.1  Intel Corporation 5520/5500/X58 Routing and Protocol Layer Registers Port 0
 |           +-11.0  Intel Corporation 5520/5500 Physical and Link Layer Registers Port 1
 |           +-11.1  Intel Corporation 5520/5500 Routing & Protocol Layer Register Port 1
 |           +-13.0  Intel Corporation 5520/5500/X58 I/O Hub I/OxAPIC Interrupt Controller
 |           +-14.0  Intel Corporation 5520/5500/X58 I/O Hub System Management Registers
 |           +-14.1  Intel Corporation 5520/5500/X58 I/O Hub GPIO and Scratch Pad Registers
 |           +-14.2  Intel Corporation 5520/5500/X58 I/O Hub Control Status and RAS Registers
 |           +-14.3  Intel Corporation 5520/5500/X58 I/O Hub Throttle Registers
 |           +-15.0  Intel Corporation 5520/5500/X58 Trusted Execution Technology Registers
 |           +-16.0  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.1  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.2  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.3  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.4  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.5  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.6  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           \-16.7  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 \-[0000:00]-+-00.0  Intel Corporation 5520/5500/X58 I/O Hub to ESI Port
             +-01.0-[0000:01]--+-00.0  Intel Corporation 82576 Gigabit Network Connection
             |                 \-00.1  Intel Corporation 82576 Gigabit Network Connection
             +-03.0-[0000:02]----00.0  LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS
             +-04.0-[0000:03]--
             +-05.0-[0000:04]--
             +-07.0-[0000:05]--+-00.0  nVidia Corporation GT218 [GeForce G210]
             |                 \-00.1  nVidia Corporation High Definition Audio Controller
             +-0d.0  Intel Corporation Device 343a
             +-0d.1  Intel Corporation Device 343b
             +-0d.2  Intel Corporation Device 343c
             +-0d.3  Intel Corporation Device 343d
             +-0d.4  Intel Corporation 5520/5500/X58 Physical Layer Port 0
             +-0d.5  Intel Corporation 5520/5500 Physical Layer Port 1
             +-0d.6  Intel Corporation Device 341a
             +-0d.7  Intel Corporation Device 341b
             +-0e.0  Intel Corporation Device 341c
             +-0e.1  Intel Corporation Device 341d
             +-0e.2  Intel Corporation Device 341e
             +-0e.3  Intel Corporation Device 341f
             +-0e.4  Intel Corporation Device 3439
             +-0f.0  Intel Corporation Device 3424
             +-10.0  Intel Corporation 5520/5500/X58 Physical and Link Layer Registers Port 0
             +-10.1  Intel Corporation 5520/5500/X58 Routing and Protocol Layer Registers Port 0
             +-11.0  Intel Corporation 5520/5500 Physical and Link Layer Registers Port 1
             +-11.1  Intel Corporation 5520/5500 Routing & Protocol Layer Register Port 1
             +-13.0  Intel Corporation 5520/5500/X58 I/O Hub I/OxAPIC Interrupt Controller
             +-14.0  Intel Corporation 5520/5500/X58 I/O Hub System Management Registers
             +-14.1  Intel Corporation 5520/5500/X58 I/O Hub GPIO and Scratch Pad Registers
             +-14.2  Intel Corporation 5520/5500/X58 I/O Hub Control Status and RAS Registers
             +-14.3  Intel Corporation 5520/5500/X58 I/O Hub Throttle Registers
             +-15.0  Intel Corporation 5520/5500/X58 Trusted Execution Technology Registers
             +-16.0  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.1  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.2  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.3  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.4  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.5  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.6  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.7  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-1a.0  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #4
             +-1a.1  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #5
             +-1a.2  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #6
             +-1a.7  Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #2
             +-1c.0-[0000:06]--
             +-1c.1-[0000:07]--
             +-1c.2-[0000:08]--
             +-1c.3-[0000:09]--
             +-1c.4-[0000:0a]----00.0  XGI Technology Inc. (eXtreme Graphics Innovation) Z11/Z11M
             +-1c.5-[0000:0b]--
             +-1d.0  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #1
             +-1d.1  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #2
             +-1d.2  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #3
             +-1d.7  Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #1
             +-1e.0-[0000:0c]--
             +-1f.0  Intel Corporation 82801JIB (ICH10) LPC Interface Controller
             +-1f.2  Intel Corporation 82801JI (ICH10 Family) 4 port SATA IDE Controller #1
             +-1f.3  Intel Corporation 82801JI (ICH10 Family) SMBus Controller
             \-1f.5  Intel Corporation 82801JI (ICH10 Family) 2 port SATA IDE Controller #2
linux-ha2:/sys/bus/pci/slots # ls
0  0-1  1  3  5  7
linux-ha2:/sys/bus/pci/slots # cat 1/address
0000:00:07
linux-ha2:/sys/bus/pci/slots # cd 1
linux-ha2:/sys/bus/pci/slots/1 # ls
adapter  address  attention  cur_bus_speed  latch  max_bus_speed  module  power
linux-ha2:/sys/bus/pci/slots/1 # cat power
1
linux-ha2:/sys/bus/pci/slots/1 # echo "\_SB_.NOD0.PCI0.MRP7 3" > /sys/kernel/debug/acpi/sci_notify
linux-ha2:/sys/bus/pci/slots/1 # cat power
0
linux-ha2:/sys/bus/pci/slots/1 # lspci -tv
-+-[0000:40]-+-00.0-[0000:41]--
 |           +-01.0-[0000:42]--+-00.0  Intel Corporation 82576 Gigabit Network Connection
 |           |                 \-00.1  Intel Corporation 82576 Gigabit Network Connection
 |           +-03.0-[0000:43]----00.0  LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS
 |           +-04.0-[0000:44]--
 |           +-05.0-[0000:45]--
 |           +-07.0-[0000:46]--
 |           +-0d.0  Intel Corporation Device 343a
 |           +-0d.1  Intel Corporation Device 343b
 |           +-0d.2  Intel Corporation Device 343c
 |           +-0d.3  Intel Corporation Device 343d
 |           +-0d.4  Intel Corporation 5520/5500/X58 Physical Layer Port 0
 |           +-0d.5  Intel Corporation 5520/5500 Physical Layer Port 1
 |           +-0d.6  Intel Corporation Device 341a
 |           +-0d.7  Intel Corporation Device 341b
 |           +-0e.0  Intel Corporation Device 341c
 |           +-0e.1  Intel Corporation Device 341d
 |           +-0e.2  Intel Corporation Device 341e
 |           +-0e.3  Intel Corporation Device 341f
 |           +-0e.4  Intel Corporation Device 3439
 |           +-0f.0  Intel Corporation Device 3424
 |           +-10.0  Intel Corporation 5520/5500/X58 Physical and Link Layer Registers Port 0
 |           +-10.1  Intel Corporation 5520/5500/X58 Routing and Protocol Layer Registers Port 0
 |           +-11.0  Intel Corporation 5520/5500 Physical and Link Layer Registers Port 1
 |           +-11.1  Intel Corporation 5520/5500 Routing & Protocol Layer Register Port 1
 |           +-13.0  Intel Corporation 5520/5500/X58 I/O Hub I/OxAPIC Interrupt Controller
 |           +-14.0  Intel Corporation 5520/5500/X58 I/O Hub System Management Registers
 |           +-14.1  Intel Corporation 5520/5500/X58 I/O Hub GPIO and Scratch Pad Registers
 |           +-14.2  Intel Corporation 5520/5500/X58 I/O Hub Control Status and RAS Registers
 |           +-14.3  Intel Corporation 5520/5500/X58 I/O Hub Throttle Registers
 |           +-15.0  Intel Corporation 5520/5500/X58 Trusted Execution Technology Registers
 |           +-16.0  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.1  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.2  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.3  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.4  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.5  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.6  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           \-16.7  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 \-[0000:00]-+-00.0  Intel Corporation 5520/5500/X58 I/O Hub to ESI Port
             +-01.0-[0000:01]--+-00.0  Intel Corporation 82576 Gigabit Network Connection
             |                 \-00.1  Intel Corporation 82576 Gigabit Network Connection
             +-03.0-[0000:02]----00.0  LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS
             +-04.0-[0000:03]--
             +-05.0-[0000:04]--
             +-0d.0  Intel Corporation Device 343a
             +-0d.1  Intel Corporation Device 343b
             +-0d.2  Intel Corporation Device 343c
             +-0d.3  Intel Corporation Device 343d
             +-0d.4  Intel Corporation 5520/5500/X58 Physical Layer Port 0
             +-0d.5  Intel Corporation 5520/5500 Physical Layer Port 1
             +-0d.6  Intel Corporation Device 341a
             +-0d.7  Intel Corporation Device 341b
             +-0e.0  Intel Corporation Device 341c
             +-0e.1  Intel Corporation Device 341d
             +-0e.2  Intel Corporation Device 341e
             +-0e.3  Intel Corporation Device 341f
             +-0e.4  Intel Corporation Device 3439
             +-0f.0  Intel Corporation Device 3424
             +-10.0  Intel Corporation 5520/5500/X58 Physical and Link Layer Registers Port 0
             +-10.1  Intel Corporation 5520/5500/X58 Routing and Protocol Layer Registers Port 0
             +-11.0  Intel Corporation 5520/5500 Physical and Link Layer Registers Port 1
             +-11.1  Intel Corporation 5520/5500 Routing & Protocol Layer Register Port 1
             +-13.0  Intel Corporation 5520/5500/X58 I/O Hub I/OxAPIC Interrupt Controller
             +-14.0  Intel Corporation 5520/5500/X58 I/O Hub System Management Registers
             +-14.1  Intel Corporation 5520/5500/X58 I/O Hub GPIO and Scratch Pad Registers
             +-14.2  Intel Corporation 5520/5500/X58 I/O Hub Control Status and RAS Registers
             +-14.3  Intel Corporation 5520/5500/X58 I/O Hub Throttle Registers
             +-15.0  Intel Corporation 5520/5500/X58 Trusted Execution Technology Registers
             +-16.0  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.1  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.2  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.3  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.4  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.5  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.6  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.7  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-1a.0  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #4
             +-1a.1  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #5
             +-1a.2  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #6
             +-1a.7  Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #2
             +-1c.0-[0000:06]--
             +-1c.1-[0000:07]--
             +-1c.2-[0000:08]--
             +-1c.3-[0000:09]--
             +-1c.4-[0000:0a]----00.0  XGI Technology Inc. (eXtreme Graphics Innovation) Z11/Z11M
             +-1c.5-[0000:0b]--
             +-1d.0  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #1
             +-1d.1  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #2
             +-1d.2  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #3
             +-1d.7  Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #1
             +-1e.0-[0000:0c]--
             +-1f.0  Intel Corporation 82801JIB (ICH10) LPC Interface Controller
             +-1f.2  Intel Corporation 82801JI (ICH10 Family) 4 port SATA IDE Controller #1
             +-1f.3  Intel Corporation 82801JI (ICH10 Family) SMBus Controller
             \-1f.5  Intel Corporation 82801JI (ICH10 Family) 2 port SATA IDE Controller #2
linux-ha2:/sys/bus/pci/slots/1 # echo "\_SB_.NOD0.PCI0.MRP7 1" > /sys/kernel/debug/acpi/sci_notify
linux-ha2:/sys/bus/pci/slots/1 # cat power
1
linux-ha2:/sys/bus/pci/slots/1 # lspci -tv
-+-[0000:40]-+-00.0-[0000:41]--
 |           +-01.0-[0000:42]--+-00.0  Intel Corporation 82576 Gigabit Network Connection
 |           |                 \-00.1  Intel Corporation 82576 Gigabit Network Connection
 |           +-03.0-[0000:43]----00.0  LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS
 |           +-04.0-[0000:44]--
 |           +-05.0-[0000:45]--
 |           +-07.0-[0000:46]--
 |           +-0d.0  Intel Corporation Device 343a
 |           +-0d.1  Intel Corporation Device 343b
 |           +-0d.2  Intel Corporation Device 343c
 |           +-0d.3  Intel Corporation Device 343d
 |           +-0d.4  Intel Corporation 5520/5500/X58 Physical Layer Port 0
 |           +-0d.5  Intel Corporation 5520/5500 Physical Layer Port 1
 |           +-0d.6  Intel Corporation Device 341a
 |           +-0d.7  Intel Corporation Device 341b
 |           +-0e.0  Intel Corporation Device 341c
 |           +-0e.1  Intel Corporation Device 341d
 |           +-0e.2  Intel Corporation Device 341e
 |           +-0e.3  Intel Corporation Device 341f
 |           +-0e.4  Intel Corporation Device 3439
 |           +-0f.0  Intel Corporation Device 3424
 |           +-10.0  Intel Corporation 5520/5500/X58 Physical and Link Layer Registers Port 0
 |           +-10.1  Intel Corporation 5520/5500/X58 Routing and Protocol Layer Registers Port 0
 |           +-11.0  Intel Corporation 5520/5500 Physical and Link Layer Registers Port 1
 |           +-11.1  Intel Corporation 5520/5500 Routing & Protocol Layer Register Port 1
 |           +-13.0  Intel Corporation 5520/5500/X58 I/O Hub I/OxAPIC Interrupt Controller
 |           +-14.0  Intel Corporation 5520/5500/X58 I/O Hub System Management Registers
 |           +-14.1  Intel Corporation 5520/5500/X58 I/O Hub GPIO and Scratch Pad Registers
 |           +-14.2  Intel Corporation 5520/5500/X58 I/O Hub Control Status and RAS Registers
 |           +-14.3  Intel Corporation 5520/5500/X58 I/O Hub Throttle Registers
 |           +-15.0  Intel Corporation 5520/5500/X58 Trusted Execution Technology Registers
 |           +-16.0  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.1  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.2  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.3  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.4  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.5  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           +-16.6  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 |           \-16.7  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
 \-[0000:00]-+-00.0  Intel Corporation 5520/5500/X58 I/O Hub to ESI Port
             +-01.0-[0000:01]--+-00.0  Intel Corporation 82576 Gigabit Network Connection
             |                 \-00.1  Intel Corporation 82576 Gigabit Network Connection
             +-03.0-[0000:02]----00.0  LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS
             +-04.0-[0000:03]--
             +-05.0-[0000:04]--
             +-07.0-[0000:05]--+-00.0  nVidia Corporation GT218 [GeForce G210]
             |                 \-00.1  nVidia Corporation High Definition Audio Controller
             +-0d.0  Intel Corporation Device 343a
             +-0d.1  Intel Corporation Device 343b
             +-0d.2  Intel Corporation Device 343c
             +-0d.3  Intel Corporation Device 343d
             +-0d.4  Intel Corporation 5520/5500/X58 Physical Layer Port 0
             +-0d.5  Intel Corporation 5520/5500 Physical Layer Port 1
             +-0d.6  Intel Corporation Device 341a
             +-0d.7  Intel Corporation Device 341b
             +-0e.0  Intel Corporation Device 341c
             +-0e.1  Intel Corporation Device 341d
             +-0e.2  Intel Corporation Device 341e
             +-0e.3  Intel Corporation Device 341f
             +-0e.4  Intel Corporation Device 3439
             +-0f.0  Intel Corporation Device 3424
             +-10.0  Intel Corporation 5520/5500/X58 Physical and Link Layer Registers Port 0
             +-10.1  Intel Corporation 5520/5500/X58 Routing and Protocol Layer Registers Port 0
             +-11.0  Intel Corporation 5520/5500 Physical and Link Layer Registers Port 1
             +-11.1  Intel Corporation 5520/5500 Routing & Protocol Layer Register Port 1
             +-13.0  Intel Corporation 5520/5500/X58 I/O Hub I/OxAPIC Interrupt Controller
             +-14.0  Intel Corporation 5520/5500/X58 I/O Hub System Management Registers
             +-14.1  Intel Corporation 5520/5500/X58 I/O Hub GPIO and Scratch Pad Registers
             +-14.2  Intel Corporation 5520/5500/X58 I/O Hub Control Status and RAS Registers
             +-14.3  Intel Corporation 5520/5500/X58 I/O Hub Throttle Registers
             +-15.0  Intel Corporation 5520/5500/X58 Trusted Execution Technology Registers
             +-16.0  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.1  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.2  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.3  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.4  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.5  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.6  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-16.7  Intel Corporation 5520/5500/X58 Chipset QuickData Technology Device
             +-1a.0  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #4
             +-1a.1  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #5
             +-1a.2  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #6
             +-1a.7  Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #2
             +-1c.0-[0000:06]--
             +-1c.1-[0000:07]--
             +-1c.2-[0000:08]--
             +-1c.3-[0000:09]--
             +-1c.4-[0000:0a]----00.0  XGI Technology Inc. (eXtreme Graphics Innovation) Z11/Z11M
             +-1c.5-[0000:0b]--
             +-1d.0  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #1
             +-1d.1  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #2
             +-1d.2  Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #3
             +-1d.7  Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #1
             +-1e.0-[0000:0c]--
             +-1f.0  Intel Corporation 82801JIB (ICH10) LPC Interface Controller
             +-1f.2  Intel Corporation 82801JI (ICH10 Family) 4 port SATA IDE Controller #1
             +-1f.3  Intel Corporation 82801JI (ICH10 Family) SMBus Controller
             \-1f.5  Intel Corporation 82801JI (ICH10 Family) 2 port SATA IDE Controller #2

> Thanks
> 
> Yinghai
> 
>
Bjorn Helgaas - Feb. 1, 2013, 11:18 p.m.
On Wed, Jan 30, 2013 at 9:10 AM, Jiang Liu <liuj97@gmail.com> wrote:
> From: Jiang Liu <jiang.liu@huawei.com>
>
> Commit 668192b678201d2fff27c "PCI: acpiphp: Move host bridge hotplug
> to pci_root.c" has moved PCI host bridge hotplug logic from acpiphp
> to pci_root, but there is still PCI host bridge hotplug related
> dead code left in acpiphp. So remove those dead code.
>
> Now companion ACPI devices are always created before corresponding
> PCI devices. And the ACPI event handle_hotplug_event_bridge() will be
> installed only if it has associated PCI device. So remove dead code to
> handle bridge hot-adding in function handle_hotplug_event_bridge().
>
> Signed-off-by: Jiang Liu <jiang.liu@huawei.com>

Applied to pci/yinghai-root-bus-hotplug for v3.9.  Thanks!

> ---
>  drivers/pci/hotplug/acpiphp.h      |   13 +---
>  drivers/pci/hotplug/acpiphp_glue.c |  124 ++++--------------------------------
>  2 files changed, 14 insertions(+), 123 deletions(-)
>
> diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h
> index b3ead7a..b70ac00 100644
> --- a/drivers/pci/hotplug/acpiphp.h
> +++ b/drivers/pci/hotplug/acpiphp.h
> @@ -79,7 +79,6 @@ struct acpiphp_bridge {
>         /* Ejectable PCI-to-PCI bridge (PCI bridge and PCI function) */
>         struct acpiphp_func *func;
>
> -       int type;
>         int nr_slots;
>
>         u32 flags;
> @@ -146,10 +145,6 @@ struct acpiphp_attention_info
>  /* PCI bus bridge HID */
>  #define ACPI_PCI_HOST_HID              "PNP0A03"
>
> -/* PCI BRIDGE type */
> -#define BRIDGE_TYPE_HOST               0
> -#define BRIDGE_TYPE_P2P                        1
> -
>  /* ACPI _STA method value (ignore bit 4; battery present) */
>  #define ACPI_STA_PRESENT               (0x00000001)
>  #define ACPI_STA_ENABLED               (0x00000002)
> @@ -158,13 +153,7 @@ struct acpiphp_attention_info
>  #define ACPI_STA_ALL                   (0x0000000f)
>
>  /* bridge flags */
> -#define BRIDGE_HAS_STA         (0x00000001)
> -#define BRIDGE_HAS_EJ0         (0x00000002)
> -#define BRIDGE_HAS_HPP         (0x00000004)
> -#define BRIDGE_HAS_PS0         (0x00000010)
> -#define BRIDGE_HAS_PS1         (0x00000020)
> -#define BRIDGE_HAS_PS2         (0x00000040)
> -#define BRIDGE_HAS_PS3         (0x00000080)
> +#define BRIDGE_HAS_EJ0         (0x00000001)
>
>  /* slot flags */
>
> diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
> index acb7af2..4681d2c 100644
> --- a/drivers/pci/hotplug/acpiphp_glue.c
> +++ b/drivers/pci/hotplug/acpiphp_glue.c
> @@ -325,8 +325,8 @@ static void init_bridge_misc(struct acpiphp_bridge *bridge)
>                 return;
>         }
>
> -       /* install notify handler */
> -       if (bridge->type != BRIDGE_TYPE_HOST) {
> +       /* install notify handler for P2P bridges */
> +       if (!pci_is_root_bus(bridge->pci_bus)) {
>                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
>                         status = acpi_remove_notify_handler(bridge->func->handle,
>                                                 ACPI_SYSTEM_NOTIFY,
> @@ -369,27 +369,12 @@ static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle
>  static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
>  {
>         acpi_handle dummy_handle;
> +       struct acpiphp_func *func;
>
>         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
> -                                       "_STA", &dummy_handle)))
> -               bridge->flags |= BRIDGE_HAS_STA;
> -
> -       if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
> -                                       "_EJ0", &dummy_handle)))
> +                                       "_EJ0", &dummy_handle))) {
>                 bridge->flags |= BRIDGE_HAS_EJ0;
>
> -       if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
> -                                       "_PS0", &dummy_handle)))
> -               bridge->flags |= BRIDGE_HAS_PS0;
> -
> -       if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
> -                                       "_PS3", &dummy_handle)))
> -               bridge->flags |= BRIDGE_HAS_PS3;
> -
> -       /* is this ejectable p2p bridge? */
> -       if (bridge->flags & BRIDGE_HAS_EJ0) {
> -               struct acpiphp_func *func;
> -
>                 dbg("found ejectable p2p bridge\n");
>
>                 /* make link between PCI bridge and PCI function */
> @@ -412,7 +397,6 @@ static void add_host_bridge(struct acpi_pci_root *root)
>         if (bridge == NULL)
>                 return;
>
> -       bridge->type = BRIDGE_TYPE_HOST;
>         bridge->handle = handle;
>
>         bridge->pci_bus = root->bus;
> @@ -432,7 +416,6 @@ static void add_p2p_bridge(acpi_handle *handle)
>                 return;
>         }
>
> -       bridge->type = BRIDGE_TYPE_P2P;
>         bridge->handle = handle;
>         config_p2p_bridge_flags(bridge);
>
> @@ -543,7 +526,7 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
>         acpi_status status;
>         acpi_handle handle = bridge->handle;
>
> -       if (bridge->type != BRIDGE_TYPE_HOST) {
> +       if (!pci_is_root_bus(bridge->pci_bus)) {
>                 status = acpi_remove_notify_handler(handle,
>                                             ACPI_SYSTEM_NOTIFY,
>                                             handle_hotplug_event_bridge);
> @@ -551,8 +534,7 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
>                         err("failed to remove notify handler\n");
>         }
>
> -       if ((bridge->type != BRIDGE_TYPE_HOST) &&
> -           ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
> +       if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
>                 status = acpi_install_notify_handler(bridge->func->handle,
>                                                 ACPI_SYSTEM_NOTIFY,
>                                                 handle_hotplug_event_func,
> @@ -1122,64 +1104,11 @@ static void acpiphp_sanitize_bus(struct pci_bus *bus)
>         }
>  }
>
> -/* Program resources in newly inserted bridge */
> -static int acpiphp_configure_p2p_bridge(acpi_handle handle)
> -{
> -       struct pci_dev *pdev = acpi_get_pci_dev(handle);
> -       struct pci_bus *bus = pdev->subordinate;
> -
> -       pci_dev_put(pdev);
> -
> -       pci_bus_size_bridges(bus);
> -       pci_bus_assign_resources(bus);
> -       acpiphp_sanitize_bus(bus);
> -       acpiphp_set_hpp_values(bus);
> -       pci_enable_bridges(bus);
> -       return 0;
> -}
> -
> -static void handle_p2p_bridge_insertion(acpi_handle handle, u32 type)
> -{
> -       struct acpi_device *device;
> -
> -       if ((type != ACPI_NOTIFY_BUS_CHECK) &&
> -                       (type != ACPI_NOTIFY_DEVICE_CHECK)) {
> -               err("unexpected notification type %d\n", type);
> -               return;
> -       }
> -
> -       if (acpi_bus_scan(handle)) {
> -               err("cannot add bridge to acpi list\n");
> -               return;
> -       }
> -       if (acpi_bus_get_device(handle, &device)) {
> -               err("ACPI device object missing\n");
> -               return;
> -       }
> -       if (!acpiphp_configure_p2p_bridge(handle))
> -               add_p2p_bridge(handle);
> -       else
> -               err("cannot configure and start bridge\n");
> -
> -}
> -
>  /*
>   * ACPI event handlers
>   */
>
>  static acpi_status
> -count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
> -{
> -       int *count = (int *)context;
> -       struct acpiphp_bridge *bridge;
> -
> -       bridge = acpiphp_handle_to_bridge(handle);
> -       if (bridge)
> -               (*count)++;
> -       return AE_OK ;
> -}
> -
> -static acpi_status
>  check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
>  {
>         struct acpiphp_bridge *bridge;
> @@ -1203,8 +1132,6 @@ static void _handle_hotplug_event_bridge(struct work_struct *work)
>         char objname[64];
>         struct acpi_buffer buffer = { .length = sizeof(objname),
>                                       .pointer = objname };
> -       struct acpi_device *device;
> -       int num_sub_bridges = 0;
>         struct acpi_hp_work *hp_work;
>         acpi_handle handle;
>         u32 type;
> @@ -1212,23 +1139,7 @@ static void _handle_hotplug_event_bridge(struct work_struct *work)
>         hp_work = container_of(work, struct acpi_hp_work, work);
>         handle = hp_work->handle;
>         type = hp_work->type;
> -
> -       if (acpi_bus_get_device(handle, &device)) {
> -               /* This bridge must have just been physically inserted */
> -               handle_p2p_bridge_insertion(handle, type);
> -               goto out;
> -       }
> -
> -       bridge = acpiphp_handle_to_bridge(handle);
> -       if (type == ACPI_NOTIFY_BUS_CHECK) {
> -               acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
> -                       count_sub_bridges, NULL, &num_sub_bridges, NULL);
> -       }
> -
> -       if (!bridge && !num_sub_bridges) {
> -               err("cannot get bridge info\n");
> -               goto out;
> -       }
> +       bridge = (struct acpiphp_bridge *)hp_work->context;
>
>         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
>
> @@ -1236,14 +1147,10 @@ static void _handle_hotplug_event_bridge(struct work_struct *work)
>         case ACPI_NOTIFY_BUS_CHECK:
>                 /* bus re-enumerate */
>                 dbg("%s: Bus check notify on %s\n", __func__, objname);
> -               if (bridge) {
> -                       dbg("%s: re-enumerating slots under %s\n",
> -                               __func__, objname);
> -                       acpiphp_check_bridge(bridge);
> -               }
> -               if (num_sub_bridges)
> -                       acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
> -                               ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
> +               dbg("%s: re-enumerating slots under %s\n", __func__, objname);
> +               acpiphp_check_bridge(bridge);
> +               acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
> +                       ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
>                 break;
>
>         case ACPI_NOTIFY_DEVICE_CHECK:
> @@ -1260,8 +1167,7 @@ static void _handle_hotplug_event_bridge(struct work_struct *work)
>         case ACPI_NOTIFY_EJECT_REQUEST:
>                 /* request device eject */
>                 dbg("%s: Device eject notify on %s\n", __func__, objname);
> -               if ((bridge->type != BRIDGE_TYPE_HOST) &&
> -                   (bridge->flags & BRIDGE_HAS_EJ0)) {
> +               if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
>                         struct acpiphp_slot *slot;
>                         slot = bridge->func->slot;
>                         if (!acpiphp_disable_slot(slot))
> @@ -1289,7 +1195,6 @@ static void _handle_hotplug_event_bridge(struct work_struct *work)
>                 break;
>         }
>
> -out:
>         kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
>  }
>
> @@ -1324,17 +1229,14 @@ static void _handle_hotplug_event_func(struct work_struct *work)
>         struct acpi_hp_work *hp_work;
>         acpi_handle handle;
>         u32 type;
> -       void *context;
>
>         hp_work = container_of(work, struct acpi_hp_work, work);
>         handle = hp_work->handle;
>         type = hp_work->type;
> -       context = hp_work->context;
> +       func = (struct acpiphp_func *)hp_work->context;
>
>         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
>
> -       func = (struct acpiphp_func *)context;
> -
>         switch (type) {
>         case ACPI_NOTIFY_BUS_CHECK:
>                 /* bus re-enumerate */
> --
> 1.7.9.5
>
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Yinghai Lu - Feb. 2, 2013, 12:01 a.m.
On Fri, Feb 1, 2013 at 12:50 AM, Yijing Wang <wangyijing@huawei.com> wrote:
> On 2013/1/31 23:59, Yinghai Lu wrote:
>> On Thu, Jan 31, 2013 at 7:37 AM, Jiang Liu <liuj97@gmail.com> wrote:
>>>
>>> So I think the code in handle_hotplug_event_bridge() to handle P2P hot-addition
>>> is dead. Yijing has helped to test the code by faking ACPI CUSTOM_METHOD, and it
>>> does work as expected.
>>
>> ok, then.
>>
>> It would be better if you can append some print out from Yijing's test
>> in the changelog.
>>
>
> Hi Yinghai,
>    I used custom_method module to make root port device 0000:00:07.0 support acpi hotplug (by adding _EJ0 method),
> This root port device also connected to a slot which support hotplug. I tested to hot plug root port device 0000:00:07.0,
> and test steps and info as bellow, if there are somethings missing during test, please let me know.
> Thanks very much!
>
> linux-ha2:/sys/bus/pci/slots # lspci -tv
>  \-[0000:00]-+-00.0  Intel Corporation 5520/5500/X58 I/O Hub to ESI Port
>              +-01.0-[0000:01]--+-00.0  Intel Corporation 82576 Gigabit Network Connection
>              |                 \-00.1  Intel Corporation 82576 Gigabit Network Connection
>              +-03.0-[0000:02]----00.0  LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS
>              +-04.0-[0000:03]--
>              +-05.0-[0000:04]--
>              +-07.0-[0000:05]--+-00.0  nVidia Corporation GT218 [GeForce G210]
>              |                 \-00.1  nVidia Corporation High Definition Audio Controller
>              +-0d.0  Intel Corporation Device 343a
> linux-ha2:/sys/bus/pci/slots # ls
> 0  0-1  1  3  5  7
> linux-ha2:/sys/bus/pci/slots # cat 1/address
> 0000:00:07
> linux-ha2:/sys/bus/pci/slots # cd 1
> linux-ha2:/sys/bus/pci/slots/1 # ls
> adapter  address  attention  cur_bus_speed  latch  max_bus_speed  module  power
> linux-ha2:/sys/bus/pci/slots/1 # cat power
> 1
> linux-ha2:/sys/bus/pci/slots/1 # echo "\_SB_.NOD0.PCI0.MRP7 3" > /sys/kernel/debug/acpi/sci_notify
> linux-ha2:/sys/bus/pci/slots/1 # cat power
> 0
> linux-ha2:/sys/bus/pci/slots/1 # lspci -tv
>  \-[0000:00]-+-00.0  Intel Corporation 5520/5500/X58 I/O Hub to ESI Port
>              +-01.0-[0000:01]--+-00.0  Intel Corporation 82576 Gigabit Network Connection
>              |                 \-00.1  Intel Corporation 82576 Gigabit Network Connection
>              +-03.0-[0000:02]----00.0  LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS
>              +-04.0-[0000:03]--
>              +-05.0-[0000:04]--
>              +-0d.0  Intel Corporation Device 343a
> linux-ha2:/sys/bus/pci/slots/1 # echo "\_SB_.NOD0.PCI0.MRP7 1" > /sys/kernel/debug/acpi/sci_notify
> linux-ha2:/sys/bus/pci/slots/1 # cat power
> 1
> linux-ha2:/sys/bus/pci/slots/1 # lspci -tv
>  \-[0000:00]-+-00.0  Intel Corporation 5520/5500/X58 I/O Hub to ESI Port
>              +-01.0-[0000:01]--+-00.0  Intel Corporation 82576 Gigabit Network Connection
>              |                 \-00.1  Intel Corporation 82576 Gigabit Network Connection
>              +-03.0-[0000:02]----00.0  LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS
>              +-04.0-[0000:03]--
>              +-05.0-[0000:04]--
>              +-07.0-[0000:05]--+-00.0  nVidia Corporation GT218 [GeForce G210]
>              |                 \-00.1  nVidia Corporation High Definition Audio Controller
>              +-0d.0  Intel Corporation Device 343a

looks good.

Thanks
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Patch

diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h
index b3ead7a..b70ac00 100644
--- a/drivers/pci/hotplug/acpiphp.h
+++ b/drivers/pci/hotplug/acpiphp.h
@@ -79,7 +79,6 @@  struct acpiphp_bridge {
 	/* Ejectable PCI-to-PCI bridge (PCI bridge and PCI function) */
 	struct acpiphp_func *func;
 
-	int type;
 	int nr_slots;
 
 	u32 flags;
@@ -146,10 +145,6 @@  struct acpiphp_attention_info
 /* PCI bus bridge HID */
 #define ACPI_PCI_HOST_HID		"PNP0A03"
 
-/* PCI BRIDGE type */
-#define BRIDGE_TYPE_HOST		0
-#define BRIDGE_TYPE_P2P			1
-
 /* ACPI _STA method value (ignore bit 4; battery present) */
 #define ACPI_STA_PRESENT		(0x00000001)
 #define ACPI_STA_ENABLED		(0x00000002)
@@ -158,13 +153,7 @@  struct acpiphp_attention_info
 #define ACPI_STA_ALL			(0x0000000f)
 
 /* bridge flags */
-#define BRIDGE_HAS_STA		(0x00000001)
-#define BRIDGE_HAS_EJ0		(0x00000002)
-#define BRIDGE_HAS_HPP		(0x00000004)
-#define BRIDGE_HAS_PS0		(0x00000010)
-#define BRIDGE_HAS_PS1		(0x00000020)
-#define BRIDGE_HAS_PS2		(0x00000040)
-#define BRIDGE_HAS_PS3		(0x00000080)
+#define BRIDGE_HAS_EJ0		(0x00000001)
 
 /* slot flags */
 
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index acb7af2..4681d2c 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -325,8 +325,8 @@  static void init_bridge_misc(struct acpiphp_bridge *bridge)
 		return;
 	}
 
-	/* install notify handler */
-	if (bridge->type != BRIDGE_TYPE_HOST) {
+	/* install notify handler for P2P bridges */
+	if (!pci_is_root_bus(bridge->pci_bus)) {
 		if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
 			status = acpi_remove_notify_handler(bridge->func->handle,
 						ACPI_SYSTEM_NOTIFY,
@@ -369,27 +369,12 @@  static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle
 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
 {
 	acpi_handle dummy_handle;
+	struct acpiphp_func *func;
 
 	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
-					"_STA", &dummy_handle)))
-		bridge->flags |= BRIDGE_HAS_STA;
-
-	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
-					"_EJ0", &dummy_handle)))
+					"_EJ0", &dummy_handle))) {
 		bridge->flags |= BRIDGE_HAS_EJ0;
 
-	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
-					"_PS0", &dummy_handle)))
-		bridge->flags |= BRIDGE_HAS_PS0;
-
-	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
-					"_PS3", &dummy_handle)))
-		bridge->flags |= BRIDGE_HAS_PS3;
-
-	/* is this ejectable p2p bridge? */
-	if (bridge->flags & BRIDGE_HAS_EJ0) {
-		struct acpiphp_func *func;
-
 		dbg("found ejectable p2p bridge\n");
 
 		/* make link between PCI bridge and PCI function */
@@ -412,7 +397,6 @@  static void add_host_bridge(struct acpi_pci_root *root)
 	if (bridge == NULL)
 		return;
 
-	bridge->type = BRIDGE_TYPE_HOST;
 	bridge->handle = handle;
 
 	bridge->pci_bus = root->bus;
@@ -432,7 +416,6 @@  static void add_p2p_bridge(acpi_handle *handle)
 		return;
 	}
 
-	bridge->type = BRIDGE_TYPE_P2P;
 	bridge->handle = handle;
 	config_p2p_bridge_flags(bridge);
 
@@ -543,7 +526,7 @@  static void cleanup_bridge(struct acpiphp_bridge *bridge)
 	acpi_status status;
 	acpi_handle handle = bridge->handle;
 
-	if (bridge->type != BRIDGE_TYPE_HOST) {
+	if (!pci_is_root_bus(bridge->pci_bus)) {
 		status = acpi_remove_notify_handler(handle,
 					    ACPI_SYSTEM_NOTIFY,
 					    handle_hotplug_event_bridge);
@@ -551,8 +534,7 @@  static void cleanup_bridge(struct acpiphp_bridge *bridge)
 			err("failed to remove notify handler\n");
 	}
 
-	if ((bridge->type != BRIDGE_TYPE_HOST) &&
-	    ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
+	if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
 		status = acpi_install_notify_handler(bridge->func->handle,
 						ACPI_SYSTEM_NOTIFY,
 						handle_hotplug_event_func,
@@ -1122,64 +1104,11 @@  static void acpiphp_sanitize_bus(struct pci_bus *bus)
 	}
 }
 
-/* Program resources in newly inserted bridge */
-static int acpiphp_configure_p2p_bridge(acpi_handle handle)
-{
-	struct pci_dev *pdev = acpi_get_pci_dev(handle);
-	struct pci_bus *bus = pdev->subordinate;
-
-	pci_dev_put(pdev);
-
-	pci_bus_size_bridges(bus);
-	pci_bus_assign_resources(bus);
-	acpiphp_sanitize_bus(bus);
-	acpiphp_set_hpp_values(bus);
-	pci_enable_bridges(bus);
-	return 0;
-}
-
-static void handle_p2p_bridge_insertion(acpi_handle handle, u32 type)
-{
-	struct acpi_device *device;
-
-	if ((type != ACPI_NOTIFY_BUS_CHECK) &&
-			(type != ACPI_NOTIFY_DEVICE_CHECK)) {
-		err("unexpected notification type %d\n", type);
-		return;
-	}
-
-	if (acpi_bus_scan(handle)) {
-		err("cannot add bridge to acpi list\n");
-		return;
-	}
-	if (acpi_bus_get_device(handle, &device)) {
-		err("ACPI device object missing\n");
-		return;
-	}
-	if (!acpiphp_configure_p2p_bridge(handle))
-		add_p2p_bridge(handle);
-	else
-		err("cannot configure and start bridge\n");
-
-}
-
 /*
  * ACPI event handlers
  */
 
 static acpi_status
-count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
-	int *count = (int *)context;
-	struct acpiphp_bridge *bridge;
-
-	bridge = acpiphp_handle_to_bridge(handle);
-	if (bridge)
-		(*count)++;
-	return AE_OK ;
-}
-
-static acpi_status
 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
 	struct acpiphp_bridge *bridge;
@@ -1203,8 +1132,6 @@  static void _handle_hotplug_event_bridge(struct work_struct *work)
 	char objname[64];
 	struct acpi_buffer buffer = { .length = sizeof(objname),
 				      .pointer = objname };
-	struct acpi_device *device;
-	int num_sub_bridges = 0;
 	struct acpi_hp_work *hp_work;
 	acpi_handle handle;
 	u32 type;
@@ -1212,23 +1139,7 @@  static void _handle_hotplug_event_bridge(struct work_struct *work)
 	hp_work = container_of(work, struct acpi_hp_work, work);
 	handle = hp_work->handle;
 	type = hp_work->type;
-
-	if (acpi_bus_get_device(handle, &device)) {
-		/* This bridge must have just been physically inserted */
-		handle_p2p_bridge_insertion(handle, type);
-		goto out;
-	}
-
-	bridge = acpiphp_handle_to_bridge(handle);
-	if (type == ACPI_NOTIFY_BUS_CHECK) {
-		acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
-			count_sub_bridges, NULL, &num_sub_bridges, NULL);
-	}
-
-	if (!bridge && !num_sub_bridges) {
-		err("cannot get bridge info\n");
-		goto out;
-	}
+	bridge = (struct acpiphp_bridge *)hp_work->context;
 
 	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 
@@ -1236,14 +1147,10 @@  static void _handle_hotplug_event_bridge(struct work_struct *work)
 	case ACPI_NOTIFY_BUS_CHECK:
 		/* bus re-enumerate */
 		dbg("%s: Bus check notify on %s\n", __func__, objname);
-		if (bridge) {
-			dbg("%s: re-enumerating slots under %s\n",
-				__func__, objname);
-			acpiphp_check_bridge(bridge);
-		}
-		if (num_sub_bridges)
-			acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
-				ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
+		dbg("%s: re-enumerating slots under %s\n", __func__, objname);
+		acpiphp_check_bridge(bridge);
+		acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
+			ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
 		break;
 
 	case ACPI_NOTIFY_DEVICE_CHECK:
@@ -1260,8 +1167,7 @@  static void _handle_hotplug_event_bridge(struct work_struct *work)
 	case ACPI_NOTIFY_EJECT_REQUEST:
 		/* request device eject */
 		dbg("%s: Device eject notify on %s\n", __func__, objname);
-		if ((bridge->type != BRIDGE_TYPE_HOST) &&
-		    (bridge->flags & BRIDGE_HAS_EJ0)) {
+		if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
 			struct acpiphp_slot *slot;
 			slot = bridge->func->slot;
 			if (!acpiphp_disable_slot(slot))
@@ -1289,7 +1195,6 @@  static void _handle_hotplug_event_bridge(struct work_struct *work)
 		break;
 	}
 
-out:
 	kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
 }
 
@@ -1324,17 +1229,14 @@  static void _handle_hotplug_event_func(struct work_struct *work)
 	struct acpi_hp_work *hp_work;
 	acpi_handle handle;
 	u32 type;
-	void *context;
 
 	hp_work = container_of(work, struct acpi_hp_work, work);
 	handle = hp_work->handle;
 	type = hp_work->type;
-	context = hp_work->context;
+	func = (struct acpiphp_func *)hp_work->context;
 
 	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 
-	func = (struct acpiphp_func *)context;
-
 	switch (type) {
 	case ACPI_NOTIFY_BUS_CHECK:
 		/* bus re-enumerate */