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Re: [PATCH qemu] Add basic power management to raspi.
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [PATCH qemu] Add basic power management to raspi. |
Date: |
Mon, 31 May 2021 13:23:50 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 |
Hi Nolan,
Thanks for your patch!
There is something odd with your email address, which apparently
became sourcehut@sigbus.net instead of nolan@sigbus.net.
On 5/18/21 10:24 PM, ~nolanl wrote:
> From: Nolan Leake <nolan@sigbus.net>
>
> This is just enough to make reboot and poweroff work.
Please precise "for Linux kernels", since this doesn't work
with firmwares (ideally we should implement the FIRMWARE_NOTIFY_REBOOT
property - which Linux sends - to handle the machine reboot/halt
via the videocore firmware model).
> Notably, the
> watchdog timer functionality is not yet implemented.
>
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/64
> Signed-off-by: Nolan Leake <nolan@sigbus.net>
> ---
> hw/arm/bcm2835_peripherals.c | 13 ++-
> hw/misc/bcm2835_powermgt.c | 157 +++++++++++++++++++++++++++
> hw/misc/meson.build | 1 +
> include/hw/arm/bcm2835_peripherals.h | 3 +-
> include/hw/misc/bcm2835_powermgt.h | 29 +++++
> 5 files changed, 201 insertions(+), 2 deletions(-)
> create mode 100644 hw/misc/bcm2835_powermgt.c
> create mode 100644 include/hw/misc/bcm2835_powermgt.h
>
> diff --git a/hw/arm/bcm2835_peripherals.c b/hw/arm/bcm2835_peripherals.c
> index dcff13433e..48538c9360 100644
> --- a/hw/arm/bcm2835_peripherals.c
> +++ b/hw/arm/bcm2835_peripherals.c
> @@ -126,6 +126,10 @@ static void bcm2835_peripherals_init(Object *obj)
>
> object_property_add_const_link(OBJECT(&s->dwc2), "dma-mr",
> OBJECT(&s->gpu_bus_mr));
> +
> + /* Power Management */
> + object_initialize_child(obj, "powermgt", &s->powermgt,
> + TYPE_BCM2835_POWERMGT);
> }
>
> static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp)
> @@ -364,9 +368,16 @@ static void bcm2835_peripherals_realize(DeviceState
> *dev, Error **errp)
> qdev_get_gpio_in_named(DEVICE(&s->ic), BCM2835_IC_GPU_IRQ,
> INTERRUPT_USB));
>
> + /* Power Management */
> + if (!sysbus_realize(SYS_BUS_DEVICE(&s->powermgt), errp)) {
> + return;
> + }
> +
> + memory_region_add_subregion(&s->peri_mr, PM_OFFSET,
> + sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->powermgt), 0));
> +
> create_unimp(s, &s->txp, "bcm2835-txp", TXP_OFFSET, 0x1000);
> create_unimp(s, &s->armtmr, "bcm2835-sp804", ARMCTRL_TIMER0_1_OFFSET,
> 0x40);
> - create_unimp(s, &s->powermgt, "bcm2835-powermgt", PM_OFFSET, 0x114);
> create_unimp(s, &s->i2s, "bcm2835-i2s", I2S_OFFSET, 0x100);
> create_unimp(s, &s->smi, "bcm2835-smi", SMI_OFFSET, 0x100);
> create_unimp(s, &s->spi[0], "bcm2835-spi0", SPI0_OFFSET, 0x20);
> diff --git a/hw/misc/bcm2835_powermgt.c b/hw/misc/bcm2835_powermgt.c
> new file mode 100644
> index 0000000000..81107ecc8f
> --- /dev/null
> +++ b/hw/misc/bcm2835_powermgt.c
> @@ -0,0 +1,157 @@
> +/*
> + * BCM2835 Power Management emulation
> + *
> + * Copyright (C) 2017 Marcin Chojnacki <marcinch7@gmail.com>
> + * Copyright (C) 2021 Nolan Leake <nolan@sigbus.net>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu/log.h"
> +#include "qemu/module.h"
> +#include "hw/misc/bcm2835_powermgt.h"
> +#include "migration/vmstate.h"
> +#include "sysemu/runstate.h"
> +
> +#define PASSWORD 0x5a000000
> +#define PASSWORD_MASK 0xff000000
> +
> +#define R_RSTC 0x1c
> +#define V_RSTC_RESET 0x20
> +#define R_RSTS 0x20
> +#define V_RSTS_POWEROFF 0x555
> +#define R_WDOG 0x24
> +
> +static uint64_t bcm2835_powermgt_read(void *opaque, hwaddr offset,
> + unsigned size)
> +{
> + BCM2835PowerMgtState *s = (BCM2835PowerMgtState *)opaque;
> + uint32_t res = 0;
> +
> + assert(size == 4);
Instead of this assert, add in bcm2835_powermgt_ops:
.impl.min_access_size = 4,
.impl.max_access_size = 4,
> +
> + switch (offset) {
> + case R_RSTC:
> + res = s->rstc;
> + break;
> + case R_RSTS:
> + res = s->rsts;
> + break;
> + case R_WDOG:
> + res = s->wdog;
> + break;
> +
> + default:
> + qemu_log_mask(LOG_UNIMP,
> + "bcm2835_powermgt_read: Unknown offset %x\n",
> + (int)offset);
> + res = 0;
> + break;
> + }
> +
> + return res;
> +}
> +
> +static void bcm2835_powermgt_write(void *opaque, hwaddr offset,
> + uint64_t value, unsigned size)
> +{
> + BCM2835PowerMgtState *s = (BCM2835PowerMgtState *)opaque;
> +
> + assert(size == 4);
(remove this assert too).
> + if ((value & PASSWORD_MASK) != PASSWORD) {
> + qemu_log_mask(LOG_GUEST_ERROR,
> + "bcm2835_powermgt_write: Bad password %x at offset
> %x\n",
Please prefix hexadecimal formats with 0x,
> + (uint32_t)value, (int)offset);
and do not cast.
> + return;
> + }
> +
> + value = value & ~PASSWORD_MASK;
> +
> + switch (offset) {
> + case R_RSTC:
> + s->rstc = value;
> + if (value & V_RSTC_RESET) {
> + if ((s->rsts & 0xfff) == V_RSTS_POWEROFF) {
> + /* Linux uses partition 63 to indicate halt. */
I'd move this comment with the V_RSTS_POWEROFF definition.
> + qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
> + } else {
> + qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
> + }
> + }
Shouldn't we log the unsupported bits?
> + break;
> + case R_RSTS:
> + s->rsts = value;
> + break;
> + case R_WDOG:
> + s->wdog = value;
> + break;
> +
> + default:
> + qemu_log_mask(LOG_UNIMP,
> + "bcm2835_powermgt_write: Unknown offset %x\n",
> + (int)offset);
Please do not cast, use the proper format.
> + break;
> + }
> +}
> +
> +static const MemoryRegionOps bcm2835_powermgt_ops = {
> + .read = bcm2835_powermgt_read,
> + .write = bcm2835_powermgt_write,
> + .endianness = DEVICE_NATIVE_ENDIAN,
> +};
> +
> +static const VMStateDescription vmstate_bcm2835_powermgt = {
> + .name = TYPE_BCM2835_POWERMGT,
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .fields = (VMStateField[]) {
> + VMSTATE_UINT32(rstc, BCM2835PowerMgtState),
> + VMSTATE_UINT32(rsts, BCM2835PowerMgtState),
> + VMSTATE_UINT32(wdog, BCM2835PowerMgtState),
> + VMSTATE_END_OF_LIST()
> + }
> +};
> +
> +static void bcm2835_powermgt_init(Object *obj)
> +{
> + BCM2835PowerMgtState *s = BCM2835_POWERMGT(obj);
> +
> + memory_region_init_io(&s->iomem, obj, &bcm2835_powermgt_ops, s,
> + TYPE_BCM2835_POWERMGT, 0x114);
> + sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
> +}
> +
> +static void bcm2835_powermgt_reset(DeviceState *dev)
> +{
> + BCM2835PowerMgtState *s = BCM2835_POWERMGT(dev);
> +
> + s->rstc = 0x00000102;
> + s->rsts = 0x00001000;
> + s->wdog = 0x00000000;
Where these bits come from?
> +}
> +
> +static void bcm2835_powermgt_class_init(ObjectClass *klass, void *data)
> +{
> + DeviceClass *dc = DEVICE_CLASS(klass);
> +
> + dc->reset = bcm2835_powermgt_reset;
> + dc->vmsd = &vmstate_bcm2835_powermgt;
> +}
> +
> +static TypeInfo bcm2835_powermgt_info = {
> + .name = TYPE_BCM2835_POWERMGT,
> + .parent = TYPE_SYS_BUS_DEVICE,
> + .instance_size = sizeof(BCM2835PowerMgtState),
> + .class_init = bcm2835_powermgt_class_init,
> + .instance_init = bcm2835_powermgt_init,
> +};
Minor comments, otherwise:
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>