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Date: Tue, 26 Mar 2013 14:16:20 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Toshi Kani <toshi.kani@...com>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
yinghai@...nel.org, jiang.liu@...wei.com,
isimatu.yasuaki@...fujitsu.com
Subject: Re: [PATCH] ACPI: Update _OST handling for notify
On Tuesday, March 05, 2013 03:33:31 PM Toshi Kani wrote:
> When the kernel calls _OSC with OSC_SB_HOTPLUG_OST_SUPPORT bit
> set at boot-time, the OS is responsible for calling _OST for
> ACPI hotplug events. However, when hotplug.enabled attribute
> is unset for ACPI scan drivers, their notify handlers are removed
> and _OST is not called for ACPI hotplug events as a result.
>
> This patch keeps the notify handler of ACPI scan drivers,
> acpi_hotplug_notify_cb(), installed regardless of the state of
> hotplug.enabled. The notify handler then checks if hotplug.enabled
> is set for the associated scan handler. If unset, the notify
> handler calls _OST with a proper error code. The patch also
> eliminates ACPI namespace walk when hotplug.enabled is changed
> via sysfs.
>
> Signed-off-by: Toshi Kani <toshi.kani@...com>
Applied to linux-pm.git/linux-next.
Thanks,
Rafael
> ---
>
> This patch applies on top of the following patchset.
> https://lkml.org/lkml/2013/3/4/455
>
> ---
> drivers/acpi/scan.c | 87 +++++++++++++++++++++------------------------------
> 1 file changed, 35 insertions(+), 52 deletions(-)
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 3f6ec0d..dfdbcfd 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -259,11 +259,43 @@ static void acpi_scan_device_check(void *context)
> ACPI_NOTIFY_DEVICE_CHECK);
> }
>
> -static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *not_used)
> +static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
> +{
> + u32 ost_status;
> +
> + switch (type) {
> + case ACPI_NOTIFY_BUS_CHECK:
> + acpi_handle_debug(handle,
> + "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
> + ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
> + break;
> + case ACPI_NOTIFY_DEVICE_CHECK:
> + acpi_handle_debug(handle,
> + "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
> + ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
> + break;
> + case ACPI_NOTIFY_EJECT_REQUEST:
> + acpi_handle_debug(handle,
> + "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
> + ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
> + break;
> + default:
> + /* non-hotplug event; possibly handled by other handler */
> + return;
> + }
> +
> + acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
> +}
> +
> +static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
> {
> acpi_osd_exec_callback callback;
> + struct acpi_scan_handler *handler = data;
> acpi_status status;
>
> + if (!handler->hotplug.enabled)
> + return acpi_hotplug_unsupported(handle, type);
> +
> switch (type) {
> case ACPI_NOTIFY_BUS_CHECK:
> acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
> @@ -1715,61 +1747,14 @@ static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
> return NULL;
> }
>
> -static acpi_status acpi_scan_hotplug_modify(acpi_handle handle,
> - u32 lvl_not_used, void *data,
> - void **ret_not_used)
> -{
> - struct acpi_device_pnp pnp = {};
> - struct acpi_scan_handler *tgt_handler = data, *handler;
> - struct acpi_hardware_id *hwid;
> - unsigned long long sta_not_used;
> - int type;
> - bool match = false;
> -
> - if (acpi_bus_type_and_status(handle, &type, &sta_not_used))
> - return AE_OK;
> -
> - INIT_LIST_HEAD(&pnp.ids);
> - acpi_set_pnp_ids(handle, &pnp, type);
> -
> - if (!pnp.type.hardware_id)
> - return AE_OK;
> -
> - list_for_each_entry(hwid, &pnp.ids, list) {
> - handler = acpi_scan_match_handler(hwid->id, NULL);
> - if (handler && handler == tgt_handler) {
> - match = true;
> - break;
> - }
> - }
> - if (!match)
> - goto out;
> -
> - if (handler->hotplug.enabled)
> - acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
> - acpi_hotplug_notify_cb, NULL);
> - else
> - acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
> - acpi_hotplug_notify_cb);
> -
> -out:
> - acpi_free_pnp_ids(&pnp);
> - return AE_OK;
> -}
> -
> void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
> {
> - struct acpi_scan_handler *handler;
> -
> if (!!hotplug->enabled == !!val)
> return;
>
> mutex_lock(&acpi_scan_lock);
>
> hotplug->enabled = val;
> - handler = container_of(hotplug, struct acpi_scan_handler, hotplug);
> - acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
> - acpi_scan_hotplug_modify, NULL, handler, NULL);
>
> mutex_unlock(&acpi_scan_lock);
> }
> @@ -1793,10 +1778,8 @@ static void acpi_scan_init_hotplug(acpi_handle handle, int type)
> list_for_each_entry(hwid, &pnp.ids, list) {
> handler = acpi_scan_match_handler(hwid->id, NULL);
> if (handler) {
> - if (handler->hotplug.enabled)
> - acpi_install_notify_handler(handle,
> - ACPI_SYSTEM_NOTIFY,
> - acpi_hotplug_notify_cb, NULL);
> + acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
> + acpi_hotplug_notify_cb, handler);
> break;
> }
> }
> --
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--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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