2012-10-19 19:17:36

by Toshi Kani

Subject: [PATCH v2 RESEND] ACPI: Add ACPI CPU hot-remove support

Added CPU hot-remove support through an ACPI eject notification.
It calls acpi_bus_hot_remove_device(), which shares the same code
path with the sysfs eject operation. acpi_os_hotplug_execute()
serializes hot-remove operations between ACPI hot-remove and sysfs
eject requests.

Signed-off-by: Toshi Kani <[email protected]>
Reviewed-by: Yasuaki Ishimatsu <[email protected]>
Tested-by: IgorMammedov <[email protected]>
Tested-by: Vijay Mohan Pandarathil <[email protected]>
Tested-by: Prarit Bhargava <[email protected]>
---
v2: Rebased to the current Linus's tree.
---
drivers/acpi/processor_driver.c | 27 +++++++++++++++++----------
1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index e78c2a5..1cc9652 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -694,8 +694,8 @@ int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
static void acpi_processor_hotplug_notify(acpi_handle handle,
u32 event, void *data)
{
- struct acpi_processor *pr;
struct acpi_device *device = NULL;
+ struct acpi_eject_event *ej_event = NULL;
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
int result;

@@ -727,20 +727,27 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
"received ACPI_NOTIFY_EJECT_REQUEST\n"));

if (acpi_bus_get_device(handle, &device)) {
- printk(KERN_ERR PREFIX
- "Device don't exist, dropping EJECT\n");
+ pr_err(PREFIX "Device don't exist, dropping EJECT\n");
break;
}
- pr = acpi_driver_data(device);
- if (!pr) {
- printk(KERN_ERR PREFIX
- "Driver data is NULL, dropping EJECT\n");
+ if (!acpi_driver_data(device)) {
+ pr_err(PREFIX "Driver data is NULL, dropping EJECT\n");
break;
}

- /* REVISIT: update when eject is supported */
- ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
- break;
+ ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
+ if (!ej_event) {
+ pr_err(PREFIX "No memory, dropping EJECT\n");
+ break;
+ }
+
+ ej_event->handle = handle;
+ ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
+ acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
+ (void *)ej_event);
+
+ /* eject is performed asynchronously */
+ return;

default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
--
1.7.11.7

2012-10-31 22:23:02

by Rafael J. Wysocki

Subject: Re: [PATCH v2 RESEND] ACPI: Add ACPI CPU hot-remove support

On Friday, October 19, 2012 01:09:53 PM Toshi Kani wrote:
> Added CPU hot-remove support through an ACPI eject notification.
> It calls acpi_bus_hot_remove_device(), which shares the same code
> path with the sysfs eject operation. acpi_os_hotplug_execute()
> serializes hot-remove operations between ACPI hot-remove and sysfs
> eject requests.
>
> Signed-off-by: Toshi Kani <[email protected]>
> Reviewed-by: Yasuaki Ishimatsu <[email protected]>
> Tested-by: IgorMammedov <[email protected]>
> Tested-by: Vijay Mohan Pandarathil <[email protected]>
> Tested-by: Prarit Bhargava <[email protected]>

This doesn't build with modular processor driver.

Thanks,
Rafael


> ---
> v2: Rebased to the current Linus's tree.
> ---
> drivers/acpi/processor_driver.c | 27 +++++++++++++++++----------
> 1 file changed, 17 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
> index e78c2a5..1cc9652 100644
> --- a/drivers/acpi/processor_driver.c
> +++ b/drivers/acpi/processor_driver.c
> @@ -694,8 +694,8 @@ int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
> static void acpi_processor_hotplug_notify(acpi_handle handle,
> u32 event, void *data)
> {
> - struct acpi_processor *pr;
> struct acpi_device *device = NULL;
> + struct acpi_eject_event *ej_event = NULL;
> u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
> int result;
>
> @@ -727,20 +727,27 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
> "received ACPI_NOTIFY_EJECT_REQUEST\n"));
>
> if (acpi_bus_get_device(handle, &device)) {
> - printk(KERN_ERR PREFIX
> - "Device don't exist, dropping EJECT\n");
> + pr_err(PREFIX "Device don't exist, dropping EJECT\n");
> break;
> }
> - pr = acpi_driver_data(device);
> - if (!pr) {
> - printk(KERN_ERR PREFIX
> - "Driver data is NULL, dropping EJECT\n");
> + if (!acpi_driver_data(device)) {
> + pr_err(PREFIX "Driver data is NULL, dropping EJECT\n");
> break;
> }
>
> - /* REVISIT: update when eject is supported */
> - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
> - break;
> + ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
> + if (!ej_event) {
> + pr_err(PREFIX "No memory, dropping EJECT\n");
> + break;
> + }
> +
> + ej_event->handle = handle;
> + ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
> + acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
> + (void *)ej_event);
> +
> + /* eject is performed asynchronously */
> + return;
>
> default:
> ACPI_DEBUG_PRINT((ACPI_DB_INFO,
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.

2012-10-31 22:43:32

by Toshi Kani

Subject: Re: [PATCH v2 RESEND] ACPI: Add ACPI CPU hot-remove support

On Wed, 2012-10-31 at 23:27 +0100, Rafael J. Wysocki wrote:
> On Friday, October 19, 2012 01:09:53 PM Toshi Kani wrote:
> > Added CPU hot-remove support through an ACPI eject notification.
> > It calls acpi_bus_hot_remove_device(), which shares the same code
> > path with the sysfs eject operation. acpi_os_hotplug_execute()
> > serializes hot-remove operations between ACPI hot-remove and sysfs
> > eject requests.
> >
> > Signed-off-by: Toshi Kani <[email protected]>
> > Reviewed-by: Yasuaki Ishimatsu <[email protected]>
> > Tested-by: IgorMammedov <[email protected]>
> > Tested-by: Vijay Mohan Pandarathil <[email protected]>
> > Tested-by: Prarit Bhargava <[email protected]>
>
> This doesn't build with modular processor driver.

Hi Rafael,

Thanks for pointing this out! I will fix the issue and send an updated
version.

-Toshi


>
> Thanks,
> Rafael
>
>
> > ---
> > v2: Rebased to the current Linus's tree.
> > ---
> > drivers/acpi/processor_driver.c | 27 +++++++++++++++++----------
> > 1 file changed, 17 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
> > index e78c2a5..1cc9652 100644
> > --- a/drivers/acpi/processor_driver.c
> > +++ b/drivers/acpi/processor_driver.c
> > @@ -694,8 +694,8 @@ int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
> > static void acpi_processor_hotplug_notify(acpi_handle handle,
> > u32 event, void *data)
> > {
> > - struct acpi_processor *pr;
> > struct acpi_device *device = NULL;
> > + struct acpi_eject_event *ej_event = NULL;
> > u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
> > int result;
> >
> > @@ -727,20 +727,27 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
> > "received ACPI_NOTIFY_EJECT_REQUEST\n"));
> >
> > if (acpi_bus_get_device(handle, &device)) {
> > - printk(KERN_ERR PREFIX
> > - "Device don't exist, dropping EJECT\n");
> > + pr_err(PREFIX "Device don't exist, dropping EJECT\n");
> > break;
> > }
> > - pr = acpi_driver_data(device);
> > - if (!pr) {
> > - printk(KERN_ERR PREFIX
> > - "Driver data is NULL, dropping EJECT\n");
> > + if (!acpi_driver_data(device)) {
> > + pr_err(PREFIX "Driver data is NULL, dropping EJECT\n");
> > break;
> > }
> >
> > - /* REVISIT: update when eject is supported */
> > - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
> > - break;
> > + ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
> > + if (!ej_event) {
> > + pr_err(PREFIX "No memory, dropping EJECT\n");
> > + break;
> > + }
> > +
> > + ej_event->handle = handle;
> > + ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
> > + acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
> > + (void *)ej_event);
> > +
> > + /* eject is performed asynchronously */
> > + return;
> >
> > default:
> > ACPI_DEBUG_PRINT((ACPI_DB_INFO,
> >