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>

3 files changed, 38 insertions, 18 deletions

diff --git a/drivers/xen/acpi.c b/drivers/xen/acpi.c
index 119d42a2bf57..90307c0b630c 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 46aa3d1c1654..4ddd7dc4a61e 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 c57d5f67f702..f1331e3e7271 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);