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Date: Tue, 10 Apr 2012 10:50:26 +0800
From: Lin Ming <ming.m.lin@...el.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
lenb@...nel.org, linux-acpi@...r.kernel.org,
konrad.r.wilk@...il.com
Subject: Re: [PATCH 1/2] ACPI: Convert wake_sleep_flags to a value instead
of function (v2)
On Mon, 2012-04-09 at 22:34 -0400, Konrad Rzeszutek Wilk wrote:
> With commit a2ef5c4fd44ce3922435139393b89f2cce47f576
> "ACPI: Move module parameter gts and bfs to sleep.c" the wake_sleep_flags
> is required when calling acpi_enter_sleep_state, which means
> that if there are functions outside the sleep.c code they
> can't get get the wake_sleep_flags values.
>
> This converts the function in to a exported value and converts
> the module config operands to a function.
>
> [v2: Parameters can be turned on/off dynamically]
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
> arch/x86/kernel/acpi/sleep.h | 2 +
> drivers/acpi/sleep.c | 52 ++++++++++++++++++++++-------------------
> 2 files changed, 30 insertions(+), 24 deletions(-)
>
> diff --git a/arch/x86/kernel/acpi/sleep.h b/arch/x86/kernel/acpi/sleep.h
> index 4d3feb5..7bab5fb 100644
> --- a/arch/x86/kernel/acpi/sleep.h
> +++ b/arch/x86/kernel/acpi/sleep.h
> @@ -9,6 +9,8 @@ extern long saved_magic;
>
> extern int wakeup_pmode_return;
>
> +extern unsigned char wake_sleep_flags;
> +
Could you use "u8" same as the definition below?
Others look good to me.
Acked-by: Lin Ming <ming.m.lin@...el.com>
Thanks,
Lin Ming
> extern unsigned long acpi_copy_wakeup_routine(unsigned long);
> extern void wakeup_long64(void);
>
> diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
> index 6a8d4d3..86bf909 100644
> --- a/drivers/acpi/sleep.c
> +++ b/drivers/acpi/sleep.c
> @@ -28,23 +28,33 @@
> #include "internal.h"
> #include "sleep.h"
>
> +u8 wake_sleep_flags = ACPI_NO_OPTIONAL_METHODS;
> static unsigned int gts, bfs;
> -module_param(gts, uint, 0644);
> -module_param(bfs, uint, 0644);
> -MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");
> -MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);
> -
> -static u8 wake_sleep_flags(void)
> +static int set_param_wake_flag(const char *val, struct kernel_param *kp)
> {
> - u8 flags = ACPI_NO_OPTIONAL_METHODS;
> + int ret = param_set_int(val, kp);
>
> - if (gts)
> - flags |= ACPI_EXECUTE_GTS;
> - if (bfs)
> - flags |= ACPI_EXECUTE_BFS;
> + if (ret)
> + return ret;
>
> - return flags;
> + if (val == (const char *)>s) {
> + if (gts)
> + wake_sleep_flags |= ACPI_EXECUTE_GTS;
> + else
> + wake_sleep_flags &= ~ACPI_EXECUTE_GTS;
> + }
> + if (val == (const char *)&bfs) {
> + if (bfs)
> + wake_sleep_flags |= ACPI_EXECUTE_BFS;
> + else
> + wake_sleep_flags &= ~ACPI_EXECUTE_BFS;
> + }
> + return ret;
> }
> +module_param_call(gts, set_param_wake_flag, param_get_int, >s, 0644);
> +module_param_call(bfs, set_param_wake_flag, param_get_int, &bfs, 0644);
> +MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");
> +MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);
>
> static u8 sleep_states[ACPI_S_STATE_COUNT];
>
> @@ -263,7 +273,6 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
> {
> acpi_status status = AE_OK;
> u32 acpi_state = acpi_target_sleep_state;
> - u8 flags = wake_sleep_flags();
> int error;
>
> ACPI_FLUSH_CPU_CACHE();
> @@ -271,7 +280,7 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
> switch (acpi_state) {
> case ACPI_STATE_S1:
> barrier();
> - status = acpi_enter_sleep_state(acpi_state, flags);
> + status = acpi_enter_sleep_state(acpi_state, wake_sleep_flags);
> break;
>
> case ACPI_STATE_S3:
> @@ -288,7 +297,7 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
> acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
>
> /* Reprogram control registers and execute _BFS */
> - acpi_leave_sleep_state_prep(acpi_state, flags);
> + acpi_leave_sleep_state_prep(acpi_state, wake_sleep_flags);
>
> /* ACPI 3.0 specs (P62) says that it's the responsibility
> * of the OSPM to clear the status bit [ implying that the
> @@ -552,30 +561,27 @@ static int acpi_hibernation_begin(void)
>
> static int acpi_hibernation_enter(void)
> {
> - u8 flags = wake_sleep_flags();
> acpi_status status = AE_OK;
>
> ACPI_FLUSH_CPU_CACHE();
>
> /* This shouldn't return. If it returns, we have a problem */
> - status = acpi_enter_sleep_state(ACPI_STATE_S4, flags);
> + status = acpi_enter_sleep_state(ACPI_STATE_S4, wake_sleep_flags);
> /* Reprogram control registers and execute _BFS */
> - acpi_leave_sleep_state_prep(ACPI_STATE_S4, flags);
> + acpi_leave_sleep_state_prep(ACPI_STATE_S4, wake_sleep_flags);
>
> return ACPI_SUCCESS(status) ? 0 : -EFAULT;
> }
>
> static void acpi_hibernation_leave(void)
> {
> - u8 flags = wake_sleep_flags();
> -
> /*
> * If ACPI is not enabled by the BIOS and the boot kernel, we need to
> * enable it here.
> */
> acpi_enable();
> /* Reprogram control registers and execute _BFS */
> - acpi_leave_sleep_state_prep(ACPI_STATE_S4, flags);
> + acpi_leave_sleep_state_prep(ACPI_STATE_S4, wake_sleep_flags);
> /* Check the hardware signature */
> if (facs && s4_hardware_signature != facs->hardware_signature) {
> printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
> @@ -830,12 +836,10 @@ static void acpi_power_off_prepare(void)
>
> static void acpi_power_off(void)
> {
> - u8 flags = wake_sleep_flags();
> -
> /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
> printk(KERN_DEBUG "%s called\n", __func__);
> local_irq_disable();
> - acpi_enter_sleep_state(ACPI_STATE_S5, flags);
> + acpi_enter_sleep_state(ACPI_STATE_S5, wake_sleep_flags);
> }
>
> /*
--
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