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Re: [PATCH 1/3] acpi/ged: Implement S3 and S4 sleep
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From: |
Igor Mammedov |
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Subject: |
Re: [PATCH 1/3] acpi/ged: Implement S3 and S4 sleep |
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Date: |
Thu, 25 Jul 2024 10:54:44 +0200 |
On Thu, 25 Jul 2024 04:30:42 -0400
"Michael S. Tsirkin" <mst@redhat.com> wrote:
> On Thu, Jul 25, 2024 at 10:22:15AM +0200, Igor Mammedov wrote:
> > On Thu, 13 Jun 2024 18:30:15 +0100
> > Jiaxun Yang <jiaxun.yang@flygoat.com> wrote:
> >
> > > Implement S3 and S4 sleep with ACPI_GED_REG_SLEEP_CTL.SLP_TYP
> > > writes.
> > >
> > > Implement wakeup callback and WAK_STS register to inform guest
> > > about current states.
> > >
> > > All new functions are gated by "slp-typs" property, it is defaulted
> > > to S5 only and machines can opt-in for S3 and S4.
> >
> > subject says S3 + S4 and don't mention S5
> > the same happens throughout the series, please fix it up
> >
> > PS:
> > please reference relevant ACPI portions in the patch below,
> > so reader could easily find and understand what code does.
> >
> > >
> > > Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
> > > ---
> > > hw/acpi/generic_event_device.c | 70
> > > ++++++++++++++++++++++++++++++----
> > > include/hw/acpi/generic_event_device.h | 12 +++++-
> > > 2 files changed, 73 insertions(+), 9 deletions(-)
> > >
> > > diff --git a/hw/acpi/generic_event_device.c
> > > b/hw/acpi/generic_event_device.c
> > > index 2d6e91b124e5..f1fc99c04011 100644
> > > --- a/hw/acpi/generic_event_device.c
> > > +++ b/hw/acpi/generic_event_device.c
> > > @@ -11,6 +11,7 @@
> > >
> > > #include "qemu/osdep.h"
> > > #include "qapi/error.h"
> > > +#include "qapi/qapi-events-run-state.h"
> > > #include "hw/acpi/acpi.h"
> > > #include "hw/acpi/generic_event_device.h"
> > > #include "hw/irq.h"
> > > @@ -186,24 +187,53 @@ static const MemoryRegionOps ged_evt_ops = {
> > >
> > > static uint64_t ged_regs_read(void *opaque, hwaddr addr, unsigned size)
> > > {
> > > + GEDState *ged_st = opaque;
> > > +
> > > + switch (addr) {
> > > + case ACPI_GED_REG_SLEEP_STS:
> > > + return ged_st->sleep_sts;
> > > + default:
> > > + break;
> > > + }
> > > +
> > > return 0;
> > > }
> > >
> > > static void ged_regs_write(void *opaque, hwaddr addr, uint64_t data,
> > > unsigned int size)
> > > {
> > > - bool slp_en;
> > > - int slp_typ;
> > > + GEDState *ged_st = opaque;
> > > + AcpiGedState *s = container_of(ged_st, AcpiGedState, ged_state);
> > >
> > > switch (addr) {
> > > case ACPI_GED_REG_SLEEP_CTL:
> > > - slp_typ = (data >> 2) & 0x07;
> > > - slp_en = (data >> 5) & 0x01;
> > maybe use defines instead of magic numbers, it's also good to add
> > coments here referring to concrete chapter in APCI spec that describe
> > what these numbers are.
>
> In fact if you add comments you do not need defines.
> One time use defines are a waste of time and hard to parse.
>
> slp_typ = (data >> 2 /* x Yz */ ) & 0x07 /* bits 0 to 3 */;
>
> is clearer than
>
> #define ACPI_S3_X_YZ 2
> #define ACPI_S3_MASK 7
>
> because that "x Yz" can match spec text *exactly*, you do
> text search and you find where it is. With macros
> you have to guess.
seconded, I'd also prefer comments (for 1-off use) that
match spec _exactly_ so reader could easily find relevant
place in spec
> build_amd_iommu is a nice example I think.
>
> >
> > > - if (slp_en && slp_typ == 5) {
> > ^^^
> > ditto
>
> this is deleted code, isn't it?
yep, sorry.
(a cup of coffee wasn't enough)
> > > - qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
> > > + if (data & ACPI_GED_SLP_EN) {
> > > + switch (extract8(data, 2, 3)) {
> > > + case ACPI_GED_SLP_TYP_S3:
> > > + if (s->slp_typs_bitmap & (1 << ACPI_GED_SLP_TYP_S3)) {
> >
> > why not use existing helpers like test_bit()
> > the same applies to following bit checks
> >
> > > + qemu_system_suspend_request();
> > > + }
> > > + break;
> > > + case ACPI_GED_SLP_TYP_S4:
> > > + if (s->slp_typs_bitmap & (1 << ACPI_GED_SLP_TYP_S4)) {
> > > + qapi_event_send_suspend_disk();
> > > +
> > > qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
> > > + }
> > > + break;
> > > + case ACPI_GED_SLP_TYP_S5:
> > > + if (s->slp_typs_bitmap & (1 << ACPI_GED_SLP_TYP_S5)) {
> > > +
> > > qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
> > > + }
> > > + break;
> > > + default:
> > > + break;
> > > + }
> > > }
> > > return;
> > > case ACPI_GED_REG_SLEEP_STS:
> > > + if (data & ACPI_GED_WAK_STS) {
> > > + ged_st->sleep_sts &= ~ACPI_GED_WAK_STS;
> > > + }
> > > return;
> > > case ACPI_GED_REG_RESET:
> > > if (data == ACPI_GED_RESET_VALUE) {
> > > @@ -223,6 +253,14 @@ static const MemoryRegionOps ged_regs_ops = {
> > > },
> > > };
> > >
> > > +static void acpi_ged_notify_wakeup(Notifier *notifier, void *data)
> > > +{
> > > + GEDState *ged_st = container_of(notifier, GEDState, wakeup);
> > > +
> > > + ged_st->sleep_sts |= ACPI_GED_WAK_STS;
> >
> > describe somewhere workflow how it is supposed to work
> > (commit message or add ged specific doc in docs/specs/
> > as the 1st patch)
> >
> > > +}
> > > +
> > > +
> > > static void acpi_ged_device_plug_cb(HotplugHandler *hotplug_dev,
> > > DeviceState *dev, Error **errp)
> > > {
> > > @@ -305,6 +343,8 @@ static void acpi_ged_send_event(AcpiDeviceIf *adev,
> > > AcpiEventStatusBits ev)
> > >
> > > static Property acpi_ged_properties[] = {
> > > DEFINE_PROP_UINT32("ged-event", AcpiGedState, ged_event_bitmap, 0),
> > > + DEFINE_PROP_UINT32("slp-typs", AcpiGedState, slp_typs_bitmap,
> > > + (1 << ACPI_GED_SLP_TYP_S5)),
> >
> > I'd default to everything enabled, and use compat mechanism
> > to disable it on older machine types.
> >
> > You have to do this as ged is also used by versioned arm/virt machine
> >
> > > DEFINE_PROP_END_OF_LIST(),
> > > };
> > >
> > > @@ -320,10 +360,11 @@ static const VMStateDescription vmstate_memhp_state
> > > = {
> > >
> > > static const VMStateDescription vmstate_ged_state = {
> > > .name = "acpi-ged-state",
> > > - .version_id = 1,
> > > - .minimum_version_id = 1,
> > > + .version_id = 2,
> > > + .minimum_version_id = 2,
> > > .fields = (const VMStateField[]) {
> > > VMSTATE_UINT32(sel, GEDState),
> > > + VMSTATE_UINT8(sleep_sts, GEDState),
> > > VMSTATE_END_OF_LIST()
> > > }
> > > };
> >
> > see for example
> > commit 829600a519386c7b188d5d813e78ba69bf0bd323
> > hpet: recover timer offset correctly
> >
> >
> >
> > > @@ -371,6 +412,18 @@ static const VMStateDescription vmstate_acpi_ged = {
> > > }
> > > };
> > >
> > > +static void acpi_ged_realize(DeviceState *dev, Error **errp)
> > > +{
> > > + AcpiGedState *s = ACPI_GED(dev);
> > > + GEDState *ged_st = &s->ged_state;
> > > +
> > > + if (s->slp_typs_bitmap & (1 << ACPI_GED_SLP_TYP_S3)) {
> > > + ged_st->wakeup.notify = acpi_ged_notify_wakeup;
> > > + qemu_register_wakeup_notifier(&ged_st->wakeup);
> > > + qemu_register_wakeup_support();
> > > + }
> > > +}
> > > +
> > > static void acpi_ged_initfn(Object *obj)
> > > {
> > > DeviceState *dev = DEVICE(obj);
> > > @@ -409,6 +462,7 @@ static void acpi_ged_class_init(ObjectClass *class,
> > > void *data)
> > > AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_CLASS(class);
> > >
> > > dc->desc = "ACPI Generic Event Device";
> > > + dc->realize = acpi_ged_realize;
> >
> > realize was added recently (currently in master),
> > please rebase on top of current master tree
> >
> > > device_class_set_props(dc, acpi_ged_properties);
> > > dc->vmsd = &vmstate_acpi_ged;
> > >
> > > diff --git a/include/hw/acpi/generic_event_device.h
> > > b/include/hw/acpi/generic_event_device.h
> > > index ba84ce021477..1ea3cb848679 100644
> > > --- a/include/hw/acpi/generic_event_device.h
> > > +++ b/include/hw/acpi/generic_event_device.h
> > > @@ -80,9 +80,16 @@ OBJECT_DECLARE_SIMPLE_TYPE(AcpiGedState, ACPI_GED)
> > > /* ACPI_GED_REG_RESET value for reset*/
> > > #define ACPI_GED_RESET_VALUE 0x42
> > >
> > > -/* ACPI_GED_REG_SLEEP_CTL.SLP_TYP value for S5 (aka poweroff) */
> > > +/* ACPI_GED_REG_SLEEP_CTL.SLP_EN bit */
> > > +#define ACPI_GED_SLP_EN (1 << 5)
> > > +
> > > +/* ACPI_GED_REG_SLEEP_CTL.SLP_TYP values */
> > > +#define ACPI_GED_SLP_TYP_S3 0x03
> > > +#define ACPI_GED_SLP_TYP_S4 0x04
> > > #define ACPI_GED_SLP_TYP_S5 0x05
> > >
> > > +#define ACPI_GED_WAK_STS (1 << 7)
> > > +
> > > #define GED_DEVICE "GED"
> > > #define AML_GED_EVT_REG "EREG"
> > > #define AML_GED_EVT_SEL "ESEL"
> > > @@ -99,7 +106,9 @@ OBJECT_DECLARE_SIMPLE_TYPE(AcpiGedState, ACPI_GED)
> > > typedef struct GEDState {
> > > MemoryRegion evt;
> > > MemoryRegion regs;
> > > + Notifier wakeup;
> > > uint32_t sel;
> > > + uint8_t sleep_sts;
> > > } GEDState;
> > >
> > > struct AcpiGedState {
> > > @@ -108,6 +117,7 @@ struct AcpiGedState {
> > > MemoryRegion container_memhp;
> > > GEDState ged_state;
> > > uint32_t ged_event_bitmap;
> > > + uint32_t slp_typs_bitmap;
> > > qemu_irq irq;
> > > AcpiGhesState ghes_state;
> > > };
> > >
>