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SubjectRe: [PATCH 1/2] ACPI: Convert wake_sleep_flags to a value instead of function (v2)
On Tue, Apr 10, 2012 at 10:50:26AM +0800, Lin Ming wrote:
> 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]

v3 version:

commit 667c0e7d85ac2fb8b852b9b777b78e392e6a72e9
Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Fri Apr 6 17:53:51 2012 -0400

ACPI: Convert wake_sleep_flags to a value instead of function (v2)

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.

Acked-by: Lin Ming <ming.m.lin@intel.com>
[v2: Parameters can be turned on/off dynamically]
[v3: unsigned char -> u8]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/arch/x86/kernel/acpi/sleep.h b/arch/x86/kernel/acpi/sleep.h
index 416d4be..fe5fdda 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 u8 wake_sleep_flags;
+
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 1d661b5..f81f5d4 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 *)&gts) {
+ 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, &gts, 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:
@@ -286,7 +295,7 @@ 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
@@ -550,30 +559,27 @@ 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, "
@@ -828,12 +834,10 @@ 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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