[Xen-devel] [PATCH v8 3/3] xen/acpi: notify xen when reduced hardware sleep is available

[Ben Guthro <benjamin.guthro@xxxxxxxxxx>]

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@xxxxxxxx>
Signed-off-by: Ben Guthro <benjamin.guthro@xxxxxxxxxx>
Acked-by: Konrad Wilk <konrad.wilk@xxxxxxxxxx>
---
 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@xxxxxxxxxxxxxxxxxxx  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@xxxxxxxxxxxxx - 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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