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Subject[PATCH v8 3/3] xen/acpi: notify xen when reduced hardware sleep is available
Date
Make use of 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>
---
drivers/xen/acpi.c | 41 ++++++++++++++++++++++++++------------
include/xen/acpi.h | 8 ++++++--
include/xen/interface/platform.h | 7 ++++---
3 files changed, 38 insertions(+), 18 deletions(-)

diff --git a/drivers/xen/acpi.c b/drivers/xen/acpi.c
index 119d42a..90307c0 100644
--- a/drivers/xen/acpi.c
+++ b/drivers/xen/acpi.c
@@ -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);
+}
diff --git a/include/xen/acpi.h b/include/xen/acpi.h
index 46aa3d1..4ddd7dc 100644
--- a/include/xen/acpi.h
+++ b/include/xen/acpi.h
@@ -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;
}
diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
index c57d5f6..f1331e3 100644
--- a/include/xen/interface/platform.h
+++ b/include/xen/interface/platform.h
@@ -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);

--
1.7.9.5


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