[Qemu-arm] [PATCH v5 00/10] Add system_powerdown support on ARM for ACPI and DT

[Shannon Zhao]

From: Shannon Zhao <address@hidden>

ACPI SPEC 5.0 defines GPIO-signaled ACPI Events for Hardware-reduced
platforms(like ARM). It uses GPIO pin to trigger an event to the guest.
For QEMU, here we add PL061 GPIO controller and use PIN 3 for
system_powerdown, reserving PIN 0, 1, 2 for PCI hotplug, CPU hotplug and
memory hotplug.

This patchset adds system_powerdown support on ARM through both ACPI and
DT ways. It adds a GPIO controller(here is PL061) in machine virt and
uses GPIO-singled event for ACPI while gpio-keys for DT. It has been
tested for the guests starting by ACPI or DT while guests use systemd or
acpid.

a) ACPI way. Since Graeme send a patchset to make ACPI on ARM64 support
amba device[1], it could use PL061 directly without modification to its
kernel driver code. In addition, we should use ACPI to start VM,
referring to below script. QEMU_EFI.fd can be fetched from [2]. 

    qemu-system-aarch64 \
    -smp 1 -m 1024 -M virt \
    -cpu cortex-a57 -nographic \
    -monitor telnet::4444,server,nowait \
    -bios QEMU_EFI.fd \
    -kernel Image \
    -initrd guestfs.cpio.gz \
    -append "rdinit=/sbin/init console=ttyAMA0 mem=512M root=/dev/ram 
earlycon=pl011,0x9000000 rw acpi=force"

b) DT way. Start vm as usual.

    qemu-system-aarch64 \
    -smp 1 -m 1024 -M virt \
    -cpu cortex-a57 -nographic \
    -monitor telnet::4444,server,nowait \
    -kernel Image \
    -initrd guestfs.cpio.gz \
    -append "rdinit=/sbin/init console=ttyAMA0 mem=512M root=/dev/ram 
earlycon=pl011,0x9000000 rw"

Guest internal setup:
If your guest FS uses systemd, you should check file
/lib/udev/rules.d/70-power-switch.rules and add the following line in it
if it doesn't exist.

SUBSYSTEM=="input", KERNEL=="event*", SUBSYSTEMS=="platform",
ATTRS{keys}=="116", TAG+="power-switch"

If your guest FS uses acpid, you should check it has
/etc/acpi/powerbtn.sh and /etc/acpi/events/powerbtn. Refer to [3] for
the setup of acpid.

Thanks,
Shannon

[1] https://lkml.org/lkml/2015/9/30/392
[2] http://people.linaro.org/~shannon.zhao/ACPI_ARM/QEMU_EFI.fd
[3] https://wiki.linaro.org/LEG/Engineering/Kernel/ACPI/GPIOPowerButton

Changes since v4:
* Include two ACPI AML API patches which change the use of those API,
  rebase this patch set on top of them
* Use new aml_interrupt() in PATCH 4
* Use new aml_method() and AML_CONSUMER for aml_gpio_int() in PATCH 8

Changes since v3:
* address Igor's comments on ACPI part
* drop "autorepeat" for /gpio-keys

Changes since v2:
* rebased on upstream QEMU
* adjust irq signalling for PowerButton of PATCH 7/8 (Peter Maydell)
* Add several Reviewed-bys and Tested-bys from Wei Huang, thanks!

Changes since v1:
* rewrite GPIO Connection Descriptor (Michael)

Igor Mammedov (1):
  acpi: extend aml_interrupt() to support multiple irqs

Shannon Zhao (8):
  ARM: Virt: Add a GPIO controller
  ARM: ACPI: Add GPIO controller in ACPI DSDT table
  ARM: ACPI: Add power button device in ACPI DSDT table
  ACPI: Add GPIO Connection Descriptor
  ACPI: Add aml_gpio_int() wrapper for GPIO Interrupt Connection
  ARM: ACPI: Add _E03 for Power Button
  ARM: Virt: Add QEMU powerdown notifier and hook it to GPIO Pin 3
  ARM: Virt: Add gpio-keys node for Poweroff using DT

Xiao Guangrong (1):
  acpi: support serialized method

 hw/acpi/aml-build.c         | 127 ++++++++++++++++++++++++++++++++++++++++----
 hw/arm/virt-acpi-build.c    |  77 +++++++++++++++++++++------
 hw/arm/virt.c               |  60 +++++++++++++++++++++
 hw/i386/acpi-build.c        |  41 +++++++-------
 include/hw/acpi/aml-build.h |  37 ++++++++++++-
 include/hw/arm/virt.h       |   1 +
 6 files changed, 294 insertions(+), 49 deletions(-)

-- 
2.0.4