acpipm: implement suspend and resume mechanism

For suspend request from VM, will write suspend event and notify
crosvm main process to pause VCPUs.

For resume request, it is not from VM itself but by the resume
command through crosvm socket. Resume request will notify the PM
device to fill its wakeup registers with wakeup event so that
when VCPUs start to run, VM can know there is wakeup from outside.

BUG=chromium:1018674
TEST=cargo test -p devices

Change-Id: I4724ffee10150065a62bf520076c16cbc70b7749
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2035169
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Tomasz Jeznach <tjeznach@chromium.org>

1 files changed, 13 insertions, 1 deletions

diff --git a/devices/src/acpi.rs b/devices/src/acpi.rs
index 983e635..6d36353 100644
--- a/devices/src/acpi.rs
+++ b/devices/src/acpi.rs
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-use crate::BusDevice;
+use crate::{BusDevice, BusResumeDevice};
 use sys_util::{error, warn, EventFd};
 
 /// ACPI PM resource for handling OS suspend/resume request
@@ -41,6 +41,8 @@ const SLEEP_CONTROL: u16 = 6;
 const SLEEP_STATUS: u16 = 7;
 const BITMASK_PM1CNT_SLEEP_ENABLE: u16 = 0x2000;
 const BITMASK_SLEEPCNT_SLEEP_ENABLE: u8 = 0x20;
+const BITMASK_PM1CNT_WAKE_STATUS: u16 = 0x8000;
+const BITMASK_SLEEPCNT_WAKE_STATUS: u8 = 0x80;
 
 impl BusDevice for ACPIPMResource {
     fn debug_label(&self) -> String {
@@ -113,3 +115,13 @@ impl BusDevice for ACPIPMResource {
         };
     }
 }
+
+impl BusResumeDevice for ACPIPMResource {
+    fn resume_imminent(&mut self) {
+        let val = self.pm1_status;
+        self.pm1_status = val | BITMASK_PM1CNT_WAKE_STATUS;
+
+        let val = self.sleep_status;
+        self.sleep_status = val | BITMASK_SLEEPCNT_WAKE_STATUS;
+    }
+}