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Re: [Qemu-devel] [PATCH-for-4.2 v8 9/9] hw/arm: Use GED for system_power
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-devel] [PATCH-for-4.2 v8 9/9] hw/arm: Use GED for system_powerdown event |
Date: |
Tue, 6 Aug 2019 15:38:18 +0200 |
On Fri, 26 Jul 2019 11:45:19 +0100
Shameer Kolothum <address@hidden> wrote:
> For machines 4.2 or higher with ACPI boot use GED for system_powerdown
> event instead of GPIO. Guest boot with DT still uses GPIO.
one more thing,
though GED is sort of described in ACPI spec, MMIO event mapping
is a totally QEMU invention.
so we probably should describe its ABI in our own spec, maybe in
docs/specs/acpi_hw_reduced_hotplug.txt
see docs/specs/acpi_foo for examples.
>
> Signed-off-by: Shameer Kolothum <address@hidden>
> ---
> v7 --> v8
> -Retained gpio based system_powerdown support for machines < 4.2.
> -Reuse of virt_powerdown_req() for ACPI GED use.
> -Dropped Eric's R-by for now because of above.
>
> ---
> hw/acpi/generic_event_device.c | 2 ++
> hw/arm/virt-acpi-build.c | 6 +++---
> hw/arm/virt.c | 27 ++++++++++++++++-----------
> include/hw/acpi/acpi_dev_interface.h | 1 +
> include/hw/arm/virt.h | 1 +
> 5 files changed, 23 insertions(+), 14 deletions(-)
>
> diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
> index 0b3214eff4..f00b0ab14b 100644
> --- a/hw/acpi/generic_event_device.c
> +++ b/hw/acpi/generic_event_device.c
> @@ -205,6 +205,8 @@ static void acpi_ged_send_event(AcpiDeviceIf *adev,
> AcpiEventStatusBits ev)
>
> if (ev & ACPI_MEMORY_HOTPLUG_STATUS) {
> sel = ACPI_GED_MEM_HOTPLUG_EVT;
> + } else if (ev & ACPI_POWER_DOWN_STATUS) {
> + sel = ACPI_GED_PWR_DOWN_EVT;
> } else {
> /* Unknown event. Return without generating interrupt. */
> warn_report("GED: Unsupported event %d. No irq injected", ev);
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index 75657caa36..31bf2bf775 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -49,7 +49,6 @@
> #include "kvm_arm.h"
>
> #define ARM_SPI_BASE 32
> -#define ACPI_POWER_BUTTON_DEVICE "PWRB"
look like this one belong to the previous patch.
Maybe we should merge both patches together?
> static void acpi_dsdt_add_cpus(Aml *scope, int smp_cpus)
> {
> @@ -739,12 +738,13 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> VirtMachineState *vms)
> (irqmap[VIRT_MMIO] + ARM_SPI_BASE),
> NUM_VIRTIO_TRANSPORTS);
> acpi_dsdt_add_pci(scope, memmap, (irqmap[VIRT_PCIE] + ARM_SPI_BASE),
> vms->highmem, vms->highmem_ecam);
> - acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
> - (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
> if (vms->acpi_dev) {
> build_ged_aml(scope, "\\_SB."GED_DEVICE,
> HOTPLUG_HANDLER(vms->acpi_dev),
> irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE,
> AML_SYSTEM_MEMORY);
> + } else {
> + acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
> + (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
> }
>
> if (vms->acpi_dev && ms->ram_slots) {
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index 41386a6eb7..73a758d9a9 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -528,7 +528,7 @@ static inline DeviceState
> *create_acpi_ged(VirtMachineState *vms, qemu_irq *pic)
> {
> DeviceState *dev;
> int irq = vms->irqmap[VIRT_ACPI_GED];
> - uint32_t event = ACPI_GED_MEM_HOTPLUG_EVT;
> + uint32_t event = ACPI_GED_MEM_HOTPLUG_EVT | ACPI_GED_PWR_DOWN_EVT;
>
> dev = DEVICE(object_new(TYPE_ACPI_GED));
> qdev_prop_set_uint64(dev, "memhp-base",
> @@ -784,13 +784,15 @@ static void create_rtc(const VirtMachineState *vms,
> qemu_irq *pic)
> static DeviceState *gpio_key_dev;
> static void virt_powerdown_req(Notifier *n, void *opaque)
> {
> - /* use gpio Pin 3 for power button event */
> - qemu_set_irq(qdev_get_gpio_in(gpio_key_dev, 0), 1);
> -}
> + VirtMachineState *s = container_of(n, VirtMachineState,
> powerdown_notifier);
>
> -static Notifier virt_system_powerdown_notifier = {
> - .notify = virt_powerdown_req
> -};
> + if (s->acpi_dev) {
> + acpi_send_event(s->acpi_dev, ACPI_POWER_DOWN_STATUS);
> + } else {
> + /* use gpio Pin 3 for power button event */
> + qemu_set_irq(qdev_get_gpio_in(gpio_key_dev, 0), 1);
> + }
> +}
>
> static void create_gpio(const VirtMachineState *vms, qemu_irq *pic)
> {
> @@ -833,9 +835,6 @@ static void create_gpio(const VirtMachineState *vms,
> qemu_irq *pic)
> qemu_fdt_setprop_cells(vms->fdt, "/gpio-keys/poweroff",
> "gpios", phandle, 3, 0);
>
> - /* connect powerdown request */
> - qemu_register_powerdown_notifier(&virt_system_powerdown_notifier);
> -
> g_free(nodename);
> }
>
> @@ -1721,12 +1720,18 @@ static void machvirt_init(MachineState *machine)
>
> create_pcie(vms, pic);
>
> - create_gpio(vms, pic);
>
> if (has_ged && aarch64 && firmware_loaded && acpi_enabled) {
> vms->acpi_dev = create_acpi_ged(vms, pic);
> + } else {
> + create_gpio(vms, pic);
> }
>
> + /* connect powerdown request */
> + vms->powerdown_notifier.notify = virt_powerdown_req;
> + qemu_register_powerdown_notifier(&vms->powerdown_notifier);
> +
> +
stray wight space?
I'd move factoring out powerdown_notifier from create_gpio into
a separate patch that precedes this one.
> /* Create mmio transports, so the user can create virtio backends
> * (which will be automatically plugged in to the transports). If
> * no backend is created the transport will just sit harmlessly idle.
> diff --git a/include/hw/acpi/acpi_dev_interface.h
> b/include/hw/acpi/acpi_dev_interface.h
> index 43ff119179..adcb3a816c 100644
> --- a/include/hw/acpi/acpi_dev_interface.h
> +++ b/include/hw/acpi/acpi_dev_interface.h
> @@ -11,6 +11,7 @@ typedef enum {
> ACPI_MEMORY_HOTPLUG_STATUS = 8,
> ACPI_NVDIMM_HOTPLUG_STATUS = 16,
> ACPI_VMGENID_CHANGE_STATUS = 32,
> + ACPI_POWER_DOWN_STATUS = 64,
> } AcpiEventStatusBits;
>
> #define TYPE_ACPI_DEVICE_IF "acpi-device-interface"
> diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
> index 577ee49b4b..0b41083e9d 100644
> --- a/include/hw/arm/virt.h
> +++ b/include/hw/arm/virt.h
> @@ -137,6 +137,7 @@ typedef struct {
> int psci_conduit;
> hwaddr highest_gpa;
> DeviceState *acpi_dev;
> + Notifier powerdown_notifier;
> } VirtMachineState;
>
> #define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM : VIRT_PCIE_ECAM)
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