src/chromiumos/tast/remote/bundles/cros/firmware/ec_watchdog.go

// Copyright 2021 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package firmware

import (
	"context"
	"fmt"
	"time"

	"chromiumos/tast/remote/firmware/fixture"
	"chromiumos/tast/ssh"
	"chromiumos/tast/testing"
	"chromiumos/tast/testing/hwdep"
)

func init() {
	testing.AddTest(&testing.Test{
		Func:         ECWatchdog,
		Desc:         "Servo based EC watchdog test",
		Contacts:     []string{"js@semihalf.com", "chromeos-firmware@google.com"},
		Attr:         []string{"group:firmware", "firmware_unstable"},
		Fixture:      fixture.NormalMode,
		HardwareDeps: hwdep.D(hwdep.ChromeEC()),
	})
}

func ECWatchdog(ctx context.Context, s *testing.State) {
	const (
		// Delay of spin-wait in ms. Nuvoton boards set the hardware watchdog to
		// 3187.5ms and also sets a timer to 2200ms. Set the timeout long enough to
		// exceed the hardware watchdog timer because the timer isn't 100% reliable.
		// If there are other platforms that use a longer watchdog timeout, this
		// may need to be adjusted.
		watchdogDelay = 3700 * time.Millisecond
		// Delay of EC power on.
		ecBootDelay = 1000 * time.Millisecond
	)
	var (
		oldBootID string
		newBootID string
		err       error
	)

	h := s.FixtValue().(*fixture.Value).Helper

	if err := h.RequireServo(ctx); err != nil {
		s.Fatal("Failed to connect to servod")
	}

	if oldBootID, err = h.Reporter.BootID(ctx); err != nil {
		s.Fatal("Failed to fetch current boot ID: ", err)
	}

	s.Log("Trigger a watchdog reset and power on system again")
	err = h.DUT.Conn().CommandContext(ctx, "sync").Run(ssh.DumpLogOnError)
	if err != nil {
		s.Fatal("Failed to sync IO on DUT before calling watchdog: ", err)
	}
	s.Log("Trigger watchdog event")
	err = h.Servo.RunECCommand(ctx, fmt.Sprintf("waitms %d", watchdogDelay))
	if err != nil {
		s.Fatal("Failed to send watchdog timer command to EC: ", err)
	}
	s.Log("Sleep during watchdog reset")
	if err = testing.Sleep(ctx, watchdogDelay+ecBootDelay); err != nil {
		s.Fatal("Failed to sleep during waiting for EC to get up: ", err)
	}
	s.Log("Wait for DUT to reconnect")
	if err = h.DUT.WaitConnect(ctx); err != nil {
		s.Fatal("Failed to reconnect to DUT: ", err)
	}
	if newBootID, err = h.Reporter.BootID(ctx); err != nil {
		s.Fatal("Failed to fetch current boot ID: ", err)
	}
	if newBootID == oldBootID {
		s.Fatal("Failed to reboot trigger watchdog reset, old boot ID is the same as new boot ID")
	}
}