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SubjectRe: [PATCH v6 2/6] ACPI: Add _OST support for sysfs eject
Hi Toshi,

2012/07/05 23:43, Toshi Kani wrote:
> On Thu, 2012-07-05 at 20:16 +0900, Yasuaki Ishimatsu wrote:
>> Hi Toshi,
>>
>> 2012/06/27 5:42, Toshi Kani wrote:
>>> Changed acpi_bus_hot_remove_device() to support _OST. This function is
>>> also changed to global so that it can be called from hotplug notify
>>> handlers to perform hot-remove operation.
>>>
>>> Changed acpi_eject_store(), which is the sysfs eject handler. It checks
>>> eject_pending to see if the request was originated from ACPI eject
>>> notification. If not, it calls _OST(0x103,84,) per Figure 6-37 in ACPI
>>> 5.0 spec.
>>>
>>> Added eject_pending bit to acpi_device_flags. This bit is set when the
>>> kernel has received an ACPI eject notification, but does not initiate
>>> its hot-remove operation by itself.
>>>
>>> Added struct acpi_eject_event. This structure is used to pass extended
>>> information to acpi_bus_hot_remove_device(), which has a single argument
>>> to support asynchronous call
>>>
>>> Signed-off-by: Toshi Kani <toshi.kani@hp.com>
>>> ---
>>> drivers/acpi/scan.c | 57 +++++++++++++++++++++++++++++++++++++++-------
>>> include/acpi/acpi_bus.h | 9 ++++++-
>>> 2 files changed, 56 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
>>> index c8a1f3b..dbdb9fc 100644
>>> --- a/drivers/acpi/scan.c
>>> +++ b/drivers/acpi/scan.c
>>> @@ -83,19 +83,29 @@ acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, cha
>>> }
>>> static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
>>>
>>> -static void acpi_bus_hot_remove_device(void *context)
>>> +/**
>>> + * acpi_bus_hot_remove_device: hot-remove a device and its children
>>> + * @context: struct acpi_eject_event pointer (freed in this func)
>>> + *
>>> + * Hot-remove a device and its children. This function frees up the
>>> + * memory space passed by arg context, so that the caller may call
>>> + * this function asynchronously through acpi_os_hotplug_execute().
>>> + */
>>> +void acpi_bus_hot_remove_device(void *context)
>>> {
>>> + struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
>>> struct acpi_device *device;
>>> - acpi_handle handle = context;
>>> + acpi_handle handle = ej_event->handle;
>>> struct acpi_object_list arg_list;
>>> union acpi_object arg;
>>> acpi_status status = AE_OK;
>>> + u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
>>>
>>> if (acpi_bus_get_device(handle, &device))
>>> - return;
>>> + goto err_out;
>>>
>>> if (!device)
>>> - return;
>>> + goto err_out;
>>>
>>> ACPI_DEBUG_PRINT((ACPI_DB_INFO,
>>> "Hot-removing device %s...\n", dev_name(&device->dev)));
>>> @@ -103,7 +113,7 @@ static void acpi_bus_hot_remove_device(void *context)
>>> if (acpi_bus_trim(device, 1)) {
>>> printk(KERN_ERR PREFIX
>>> "Removing device failed\n");
>>> - return;
>>> + goto err_out;
>>> }
>>>
>>> /* power off device */
>>> @@ -129,10 +139,20 @@ static void acpi_bus_hot_remove_device(void *context)
>>> * TBD: _EJD support.
>>> */
>>> status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
>>> - if (ACPI_FAILURE(status))
>>> - printk(KERN_WARNING PREFIX
>>> - "Eject device failed\n");
>>> + if (ACPI_FAILURE(status)) {
>>> + if (status != AE_NOT_FOUND)
>>> + pr_warn(PREFIX "Eject device failed\n");
>>> + goto err_out;
>>> + }
>>> +
>>> + kfree(context);
>>> + return;
>>>
>>> +err_out:
>>> + /* Inform firmware the hot-remove operation has completed w/ error */
>>> + (void) acpi_evaluate_hotplug_ost(handle,
>>> + ej_event->event, ost_code, NULL);
>>> + kfree(context);
>>> return;
>>> }
>>
>> When I read your patch named [PATCH] ACPI: Add ACPI CPU hot-remove support,
>> a question about this patch appeared.
>>
>> The question is :
>> Why does not acpi_bus_hot_remove_device() inform firmware of
>> ACPI_OST_SC_SUCCESS, when it succeeded? Are thre any reasons?
>>
>> If you have already discussed my question, please let me know the log.
>
> Hi Yasuaki,
>
> Please refer Figure 2, page 14, of the following document. _EJ0
> substitutes _OST as it indicates to the firmware that the OS was
> successful in offlining.
>
> DIG64 Hot-Plug & Partitioning Flow (HPPF) Specification R1.0
> http://www.dig64.org/home/DIG64_HPPF_R1_0.pdf
>
> Figure 6-37 of ACPI 5.0 spec also has a similar example flow.

My question was solved by the document.

Thanks,
Yasuaki Ishimatsu

>
> Thanks,
> -Toshi
>
>
>> Thanks,
>> Yasuaki Ishimatsu
>>
>>
>>>
>>> @@ -144,6 +164,7 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
>>> acpi_status status;
>>> acpi_object_type type = 0;
>>> struct acpi_device *acpi_device = to_acpi_device(d);
>>> + struct acpi_eject_event *ej_event;
>>>
>>> if ((!count) || (buf[0] != '1')) {
>>> return -EINVAL;
>>> @@ -160,7 +181,25 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
>>> goto err;
>>> }
>>>
>>> - acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
>>> + ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
>>> + if (!ej_event) {
>>> + ret = -ENOMEM;
>>> + goto err;
>>> + }
>>> +
>>> + ej_event->handle = acpi_device->handle;
>>> + if (acpi_device->flags.eject_pending) {
>>> + /* event originated from ACPI eject notification */
>>> + ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
>>> + acpi_device->flags.eject_pending = 0;
>>> + } else {
>>> + /* event originated from user */
>>> + ej_event->event = ACPI_OST_EC_OSPM_EJECT;
>>> + (void) acpi_evaluate_hotplug_ost(ej_event->handle,
>>> + ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
>>> + }
>>> +
>>> + acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
>>> err:
>>> return ret;
>>> }
>>> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
>>> index 1d9e432..b22b774 100644
>>> --- a/include/acpi/acpi_bus.h
>>> +++ b/include/acpi/acpi_bus.h
>>> @@ -182,7 +182,8 @@ struct acpi_device_flags {
>>> u32 suprise_removal_ok:1;
>>> u32 power_manageable:1;
>>> u32 performance_manageable:1;
>>> - u32 reserved:24;
>>> + u32 eject_pending:1;
>>> + u32 reserved:23;
>>> };
>>>
>>> /* File System */
>>> @@ -334,6 +335,11 @@ struct acpi_bus_event {
>>> u32 data;
>>> };
>>>
>>> +struct acpi_eject_event {
>>> + acpi_handle handle;
>>> + u32 event;
>>> +};
>>> +
>>> extern struct kobject *acpi_kobj;
>>> extern int acpi_bus_generate_netlink_event(const char*, const char*, u8, int);
>>> void acpi_bus_private_data_handler(acpi_handle, void *);
>>> @@ -371,6 +377,7 @@ int acpi_bus_register_driver(struct acpi_driver *driver);
>>> void acpi_bus_unregister_driver(struct acpi_driver *driver);
>>> int acpi_bus_add(struct acpi_device **child, struct acpi_device *parent,
>>> acpi_handle handle, int type);
>>> +void acpi_bus_hot_remove_device(void *context);
>>> int acpi_bus_trim(struct acpi_device *start, int rmdevice);
>>> int acpi_bus_start(struct acpi_device *device);
>>> acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
>>>
>>
>>
>>
>
>





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