On Saturday 05 January 2008 17:41, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@xxxxxxx>
>
> The execution of ACPI global control methods _GTS and _BFS is
> currently tied to the preparation to enter a sleep state and to the
> leaving of the sleep state, respectively. However, these functions
> are called before disabling the nonboot CPUs and after enabling
> them, respectively (in fact, on ACPI 1.0x systems the first of them
> ought to be called before suspending devices), while according to the
> ACPI specification, _GTS is to be executed right prior to entering
> the system sleep state and _BFS is to be executed right after the
> platfor firmware has returned control to the OS on wake up.
ACPI 1.0 systems don't have _GTS or _BFS -- they were added
as optional control methods starting in ACPI 2.0.
The ACPI 1.0 installed base of Windows by definition could
not have invoked them -- so vendors could not have possibly
made their invocation mandatory w/o adding special handling
fro the installed base. I guess they never found a reason
to do this, because I've not yet seen a BIOS that implements them.
So the patch looks good, but Linux support for _GTS and _BFS
is purely academic at this point.
Rafael,
Do you grant Intel permission to incorporate this change
into the upstream ACPICA source base and ship it under
the the ACPICA source license to all ACPICA customers?
thanks,
-Len
> Move the execution of _GTS and _BFS to the right places.
>
> Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
> Acked-by: Pavel Machek <pavel@xxxxxxx>
> ---
> drivers/acpi/hardware/hwsleep.c | 75 ++++++++++++++++++++++++++++++----------
> drivers/acpi/sleep/main.c | 7 +++
> include/acpi/acpixf.h | 2 +
> 3 files changed, 66 insertions(+), 18 deletions(-)
>
> Index: linux-2.6/drivers/acpi/hardware/hwsleep.c
> ===================================================================
> --- linux-2.6.orig/drivers/acpi/hardware/hwsleep.c
> +++ linux-2.6/drivers/acpi/hardware/hwsleep.c
> @@ -192,18 +192,13 @@ acpi_status acpi_enter_sleep_state_prep(
> arg.type = ACPI_TYPE_INTEGER;
> arg.integer.value = sleep_state;
>
> - /* Run the _PTS and _GTS methods */
> + /* Run the _PTS method */
>
> status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
> if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
> return_ACPI_STATUS(status);
> }
>
> - status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
> - if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
> - return_ACPI_STATUS(status);
> - }
> -
> /* Setup the argument to _SST */
>
> switch (sleep_state) {
> @@ -262,6 +257,8 @@ acpi_status asmlinkage acpi_enter_sleep_
> struct acpi_bit_register_info *sleep_type_reg_info;
> struct acpi_bit_register_info *sleep_enable_reg_info;
> u32 in_value;
> + struct acpi_object_list arg_list;
> + union acpi_object arg;
> acpi_status status;
>
> ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
> @@ -307,6 +304,18 @@ acpi_status asmlinkage acpi_enter_sleep_
> return_ACPI_STATUS(status);
> }
>
> + /* Execute the _GTS method */
> +
> + arg_list.count = 1;
> + arg_list.pointer = &arg;
> + arg.type = ACPI_TYPE_INTEGER;
> + arg.integer.value = sleep_state;
> +
> + status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
> + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
> + return_ACPI_STATUS(status);
> + }
> +
> /* Get current value of PM1A control */
>
> status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
> @@ -473,17 +482,18 @@ ACPI_EXPORT_SYMBOL(acpi_enter_sleep_stat
>
> /*******************************************************************************
> *
> - * FUNCTION: acpi_leave_sleep_state
> + * FUNCTION: acpi_leave_sleep_state_prep
> *
> - * PARAMETERS: sleep_state - Which sleep state we just exited
> + * PARAMETERS: sleep_state - Which sleep state we are exiting
> *
> * RETURN: Status
> *
> - * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
> - * Called with interrupts ENABLED.
> + * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
> + * sleep.
> + * Called with interrupts DISABLED.
> *
> ******************************************************************************/
> -acpi_status acpi_leave_sleep_state(u8 sleep_state)
> +acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
> {
> struct acpi_object_list arg_list;
> union acpi_object arg;
> @@ -493,7 +503,7 @@ acpi_status acpi_leave_sleep_state(u8 sl
> u32 PM1Acontrol;
> u32 PM1Bcontrol;
>
> - ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
> + ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
>
> /*
> * Set SLP_TYPE and SLP_EN to state S0.
> @@ -540,6 +550,41 @@ acpi_status acpi_leave_sleep_state(u8 sl
> }
> }
>
> + /* Execute the _BFS method */
> +
> + arg_list.count = 1;
> + arg_list.pointer = &arg;
> + arg.type = ACPI_TYPE_INTEGER;
> + arg.integer.value = sleep_state;
> +
> + status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
> + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
> + ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
> + }
> +
> + return_ACPI_STATUS(status);
> +}
> +
> +/*******************************************************************************
> + *
> + * FUNCTION: acpi_leave_sleep_state
> + *
> + * PARAMETERS: sleep_state - Which sleep state we just exited
> + *
> + * RETURN: Status
> + *
> + * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
> + * Called with interrupts ENABLED.
> + *
> + ******************************************************************************/
> +acpi_status acpi_leave_sleep_state(u8 sleep_state)
> +{
> + struct acpi_object_list arg_list;
> + union acpi_object arg;
> + acpi_status status;
> +
> + ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
> +
> /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
>
> acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
> @@ -558,12 +603,6 @@ acpi_status acpi_leave_sleep_state(u8 sl
> ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
> }
>
> - arg.integer.value = sleep_state;
> - status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
> - if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
> - ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
> - }
> -
> /*
> * GPEs must be enabled before _WAK is called as GPEs
> * might get fired there
> Index: linux-2.6/drivers/acpi/sleep/main.c
> ===================================================================
> --- linux-2.6.orig/drivers/acpi/sleep/main.c
> +++ linux-2.6/drivers/acpi/sleep/main.c
> @@ -139,6 +139,9 @@ static int acpi_pm_enter(suspend_state_t
> break;
> }
>
> + /* Reprogram control registers and execute _BFS */
> + acpi_leave_sleep_state_prep(acpi_state);
> +
> /* ACPI 3.0 specs (P62) says that it's the responsabilty
> * of the OSPM to clear the status bit [ implying that the
> * POWER_BUTTON event should not reach userspace ]
> @@ -272,6 +275,8 @@ static int acpi_hibernation_enter(void)
> acpi_enable_wakeup_device(ACPI_STATE_S4);
> /* This shouldn't return. If it returns, we have a problem */
> status = acpi_enter_sleep_state(ACPI_STATE_S4);
> + /* Reprogram control registers and execute _BFS */
> + acpi_leave_sleep_state_prep(ACPI_STATE_S4);
> local_irq_restore(flags);
>
> return ACPI_SUCCESS(status) ? 0 : -EFAULT;
> @@ -284,6 +289,8 @@ static void acpi_hibernation_leave(void)
> * enable it here.
> */
> acpi_enable();
> + /* Reprogram control registers and execute _BFS */
> + acpi_leave_sleep_state_prep(ACPI_STATE_S4);
> }
>
> static void acpi_hibernation_finish(void)
> Index: linux-2.6/include/acpi/acpixf.h
> ===================================================================
> --- linux-2.6.orig/include/acpi/acpixf.h
> +++ linux-2.6/include/acpi/acpixf.h
> @@ -335,6 +335,8 @@ acpi_status asmlinkage acpi_enter_sleep_
>
> acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void);
>
> +acpi_status acpi_leave_sleep_state_prep(u8 sleep_state);
> +
> acpi_status acpi_leave_sleep_state(u8 sleep_state);
>
> #endif /* __ACXFACE_H__ */
>
> -
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