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xen / ACPI: notify xen when reduced hardware sleep is available 

Use the acpi_os_prepare_extended_sleep() callback to notify xen
to make use of the reduced hardware sleep functionality

The xen hypervisor change underlying this is commit 62d1a69
("ACPI: support v5 (reduced HW) sleep interface") on the master
branch of git://xenbits.xen.org/xen.git.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Ben Guthro <benjamin.guthro@citrix.com>
Acked-by: Konrad Wilk <konrad.wilk@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ben Guthro 2013-07-30 08:24:54 -04:00 committed by Rafael J. Wysocki
parent d6b47b1224
commit be6b25d15f
3 changed files with 38 additions and 18 deletions
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41
drivers/xen/acpi.c
View File

@ -35,28 +35,43 @@
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
int xen_acpi_notify_hypervisor_state(u8 sleep_state,
u32 pm1a_cnt, u32 pm1b_cnt)
static int xen_acpi_notify_hypervisor_state(u8 sleep_state,
u32 val_a, u32 val_b,
bool extended)
{
unsigned int bits = extended ? 8 : 16;
struct xen_platform_op op = {
.cmd = XENPF_enter_acpi_sleep,
.interface_version = XENPF_INTERFACE_VERSION,
.u = {
.enter_acpi_sleep = {
.pm1a_cnt_val = (u16)pm1a_cnt,
.pm1b_cnt_val = (u16)pm1b_cnt,
.sleep_state = sleep_state,
},
.u.enter_acpi_sleep = {
.val_a = (u16)val_a,
.val_b = (u16)val_b,
.sleep_state = sleep_state,
.flags = extended ? XENPF_ACPI_SLEEP_EXTENDED : 0,
},
};
if ((pm1a_cnt & 0xffff0000) || (pm1b_cnt & 0xffff0000)) {
WARN(1, "Using more than 16bits of PM1A/B 0x%x/0x%x!"
"Email xen-devel@lists.xensource.com Thank you.\n", \
pm1a_cnt, pm1b_cnt);
if (WARN((val_a & (~0 << bits)) || (val_b & (~0 << bits)),
"Using more than %u bits of sleep control values %#x/%#x!"
"Email xen-devel@lists.xen.org - Thank you.\n", \
bits, val_a, val_b))
return -1;
}
HYPERVISOR_dom0_op(&op);
return 1;
}
int xen_acpi_notify_hypervisor_sleep(u8 sleep_state,
u32 pm1a_cnt, u32 pm1b_cnt)
{
return xen_acpi_notify_hypervisor_state(sleep_state, pm1a_cnt,
pm1b_cnt, false);
}
int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
u32 val_a, u32 val_b)
{
return xen_acpi_notify_hypervisor_state(sleep_state, val_a,
val_b, true);
}

8
include/xen/acpi.h
View File

@ -75,8 +75,10 @@ static inline int xen_acpi_get_pxm(acpi_handle h)
return -ENXIO;
}
int xen_acpi_notify_hypervisor_state(u8 sleep_state,
int xen_acpi_notify_hypervisor_sleep(u8 sleep_state,
u32 pm1a_cnt, u32 pm1b_cnd);
int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
u32 val_a, u32 val_b);
static inline int xen_acpi_suspend_lowlevel(void)
{
@ -93,7 +95,9 @@ static inline void xen_acpi_sleep_register(void)
{
if (xen_initial_domain()) {
acpi_os_set_prepare_sleep(
&xen_acpi_notify_hypervisor_state);
&xen_acpi_notify_hypervisor_sleep);
acpi_os_set_prepare_extended_sleep(
&xen_acpi_notify_hypervisor_extended_sleep);
acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel;
}

7
include/xen/interface/platform.h
View File

@ -152,10 +152,11 @@ DEFINE_GUEST_HANDLE_STRUCT(xenpf_firmware_info_t);
#define XENPF_enter_acpi_sleep 51
struct xenpf_enter_acpi_sleep {
/* IN variables */
uint16_t pm1a_cnt_val; /* PM1a control value. */
uint16_t pm1b_cnt_val; /* PM1b control value. */
uint16_t val_a; /* PM1a control / sleep type A. */
uint16_t val_b; /* PM1b control / sleep type B. */
uint32_t sleep_state; /* Which state to enter (Sn). */
uint32_t flags; /* Must be zero. */
#define XENPF_ACPI_SLEEP_EXTENDED 0x00000001
uint32_t flags; /* XENPF_ACPI_SLEEP_*. */
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_enter_acpi_sleep_t);