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Date: Thu, 07 Feb 2013 12:43:15 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc: ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Matthew Garrett <matthew.garrett@...ula.com>,
Yinghai Lu <yinghai@...nel.org>, Jiang Liu <liuj97@...il.com>,
Toshi Kani <toshi.kani@...com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ACPI / scan: Simplify container driver
On Thursday, February 07, 2013 05:32:15 PM Yasuaki Ishimatsu wrote:
> Hi Rafael,
>
> Sorry for late reply.
No problem, thank you for the review.
> 2013/02/04 8:47, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >
> > The only useful thing that the ACPI container driver does is to
> > install system notify handlers for all container and module device
> > objects it finds in the namespace. The driver structure,
> > acpi_container_driver, and the data structures created by its
> > .add() callback are in fact not used by the driver, so remove
> > them entirely.
> >
> > It also makes a little sense to build that driver as a module,
> > so make it non-modular and add its initialization to the
> > namespace scanning code.
> >
> > In addition to that, make the namespace walk callback used for
> > installing the notify handlers more straightforward.
> >
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > ---
> > drivers/acpi/Kconfig | 2
> > drivers/acpi/container.c | 158 ++++++-----------------------------------------
> > drivers/acpi/internal.h | 5 +
> > drivers/acpi/scan.c | 1
> > 4 files changed, 30 insertions(+), 136 deletions(-)
> >
> > Index: test/drivers/acpi/container.c
> > ===================================================================
> > --- test.orig/drivers/acpi/container.c
> > +++ test/drivers/acpi/container.c
> > @@ -38,41 +38,15 @@
> >
> > #define PREFIX "ACPI: "
> >
> > -#define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
> > -#define ACPI_CONTAINER_CLASS "container"
> > -
> > -#define INSTALL_NOTIFY_HANDLER 1
> > -#define UNINSTALL_NOTIFY_HANDLER 2
> > -
> > #define _COMPONENT ACPI_CONTAINER_COMPONENT
> > ACPI_MODULE_NAME("container");
> >
> > -MODULE_AUTHOR("Anil S Keshavamurthy");
> > -MODULE_DESCRIPTION("ACPI container driver");
> > -MODULE_LICENSE("GPL");
> > -
> > -static int acpi_container_add(struct acpi_device *device);
> > -static int acpi_container_remove(struct acpi_device *device);
> > -
> > static const struct acpi_device_id container_device_ids[] = {
> > {"ACPI0004", 0},
> > {"PNP0A05", 0},
> > {"PNP0A06", 0},
> > {"", 0},
> > };
> > -MODULE_DEVICE_TABLE(acpi, container_device_ids);
> > -
> > -static struct acpi_driver acpi_container_driver = {
> > - .name = "container",
> > - .class = ACPI_CONTAINER_CLASS,
> > - .ids = container_device_ids,
> > - .ops = {
> > - .add = acpi_container_add,
> > - .remove = acpi_container_remove,
> > - },
> > -};
> > -
> > -/*******************************************************************/
> >
> > static int is_device_present(acpi_handle handle)
> > {
> > @@ -92,49 +66,6 @@ static int is_device_present(acpi_handle
> > return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
> > }
> >
> > -static bool is_container_device(const char *hid)
> > -{
> > - const struct acpi_device_id *container_id;
> > -
> > - for (container_id = container_device_ids;
> > - container_id->id[0]; container_id++) {
> > - if (!strcmp((char *)container_id->id, hid))
> > - return true;
> > - }
> > -
> > - return false;
> > -}
> > -
> > -/*******************************************************************/
> > -static int acpi_container_add(struct acpi_device *device)
> > -{
> > - struct acpi_container *container;
> > -
> > - container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
> > - if (!container)
> > - return -ENOMEM;
> > -
> > - container->handle = device->handle;
> > - strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
> > - strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
> > - device->driver_data = container;
> > -
> > - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
> > - acpi_device_name(device), acpi_device_bid(device)));
> > -
> > - return 0;
> > -}
> > -
> > -static int acpi_container_remove(struct acpi_device *device)
> > -{
> > - acpi_status status = AE_OK;
> > - struct acpi_container *pc = NULL;
> > -
> > - pc = acpi_driver_data(device);
> > - kfree(pc);
> > - return status;
> > -}
> > -
> > static void container_notify_cb(acpi_handle handle, u32 type, void *context)
> > {
> > struct acpi_device *device = NULL;
> > @@ -199,84 +130,41 @@ static void container_notify_cb(acpi_han
> > return;
> > }
> >
> > -static acpi_status
> > -container_walk_namespace_cb(acpi_handle handle,
> > - u32 lvl, void *context, void **rv)
> > +static bool is_container(acpi_handle handle)
> > {
> > - char *hid = NULL;
> > struct acpi_device_info *info;
> > - acpi_status status;
> > - int *action = context;
> > + bool ret = false;
> >
> > - status = acpi_get_object_info(handle, &info);
> > - if (ACPI_FAILURE(status)) {
> > - return AE_OK;
> > - }
> > -
> > - if (info->valid & ACPI_VALID_HID)
> > - hid = info->hardware_id.string;
> > -
> > - if (hid == NULL) {
> > - goto end;
> > - }
> > + if (ACPI_FAILURE(acpi_get_object_info(handle, &info)))
> > + return false;
> >
> > - if (!is_container_device(hid))
> > - goto end;
> > + if (info->valid & ACPI_VALID_HID) {
> > + const struct acpi_device_id *id;
> >
> > - switch (*action) {
> > - case INSTALL_NOTIFY_HANDLER:
> > - acpi_install_notify_handler(handle,
> > - ACPI_SYSTEM_NOTIFY,
> > - container_notify_cb, NULL);
> > - break;
> > - case UNINSTALL_NOTIFY_HANDLER:
> > - acpi_remove_notify_handler(handle,
> > - ACPI_SYSTEM_NOTIFY,
> > - container_notify_cb);
> > - break;
> > - default:
> > - break;
> > + for (id = container_device_ids; id->id[0]; id++) {
> > + ret = !strcmp((char *)id->id, info->hardware_id.string);
> > + if (ret)
> > + break;
> > + }
> > }
> > -
> > - end:
> > kfree(info);
> > -
> > - return AE_OK;
> > + return ret;
> > }
> >
> > -static int __init acpi_container_init(void)
> > +static acpi_status acpi_container_register_notify_handler(acpi_handle handle,
> > + u32 lvl, void *ctxt,
> > + void **retv)
> > {
> > - int result = 0;
> > - int action = INSTALL_NOTIFY_HANDLER;
> > -
> > - result = acpi_bus_register_driver(&acpi_container_driver);
> > - if (result < 0) {
> > - return (result);
> > - }
> > -
> > - /* register notify handler to every container device */
> > - acpi_walk_namespace(ACPI_TYPE_DEVICE,
> > - ACPI_ROOT_OBJECT,
> > - ACPI_UINT32_MAX,
> > - container_walk_namespace_cb, NULL, &action, NULL);
> > + if (is_container(handle))
> > + acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
> > + container_notify_cb, NULL);
> >
> > - return (0);
> > + return AE_OK;
> > }
> >
> > -static void __exit acpi_container_exit(void)
> > +void __init acpi_container_init(void)
> > {
> > - int action = UNINSTALL_NOTIFY_HANDLER;
> > -
> > -
> > - acpi_walk_namespace(ACPI_TYPE_DEVICE,
> > - ACPI_ROOT_OBJECT,
> > - ACPI_UINT32_MAX,
> > - container_walk_namespace_cb, NULL, &action, NULL);
> > -
> > - acpi_bus_unregister_driver(&acpi_container_driver);
> > -
> > - return;
> > + acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
> > + acpi_container_register_notify_handler, NULL,
> > + NULL, NULL);
> > }
> > -
> > -module_init(acpi_container_init);
> > -module_exit(acpi_container_exit);
> > Index: test/drivers/acpi/Kconfig
> > ===================================================================
> > --- test.orig/drivers/acpi/Kconfig
> > +++ test/drivers/acpi/Kconfig
> > @@ -334,7 +334,7 @@ config X86_PM_TIMER
> > systems require this timer.
> >
> > config ACPI_CONTAINER
> > - tristate "Container and Module Devices (EXPERIMENTAL)"
> > + bool "Container and Module Devices (EXPERIMENTAL)"
> > depends on EXPERIMENTAL
> > default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU || ACPI_HOTPLUG_IO)
> > help
> > Index: test/drivers/acpi/internal.h
> > ===================================================================
> > --- test.orig/drivers/acpi/internal.h
> > +++ test/drivers/acpi/internal.h
> > @@ -40,6 +40,11 @@ void acpi_memory_hotplug_init(void);
> > #else
> > static inline void acpi_memory_hotplug_init(void) {}
> > #endif
>
> > +#ifdef ACPI_CONTAINER
>
> It should be CONFIG_ACPI_CONTAINER.
Totally correct.
> By this, acpi_container_init() do nothing. When I fix it and test the patch,
> the patch goes well.
>
> If you update the patch, I'll test again.
This fix from Toshi Kani is necessary in addition to it, though
https://patchwork.kernel.org/patch/2108851/
because FORCE_EJECT is never set as far as I can say.
Thanks,
Rafael
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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