Re: [Qemu-devel] [PULL 42/43] piix4: add acpi pci hotplug support

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 14 Oct 2013 18:01:20 +0300
"Michael S. Tsirkin" <mst@redhat.com> wrote:

> Add support for acpi pci hotplug using the
> new infrastructure.
> PIIX4 legacy interface is maintained as is for
> machine types 1.6 and older.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>  include/hw/i386/pc.h |  5 ++++
>  hw/acpi/piix4.c      | 75 +++++++++++++++++++++++++++++++++++++++++++++-------
>  2 files changed, 70 insertions(+), 10 deletions(-)
> 
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index 39db8cb..6865972 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -249,6 +249,11 @@ int e820_add_entry(uint64_t, uint64_t, uint32_t);
>  
>  #define PC_COMPAT_1_6 \
>          {\
> +            .driver   = "PIIX4_PM",\
> +            .property = "acpi-pci-hotplug-with-bridge-support",\
> +            .value    = "off",\
> +        }, \
> +        {\
>              .driver   = "e1000",\
>              .property = "mitigation",\
>              .value    = "off",\
> diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
> index 3bcd890..d516033 100644
> --- a/hw/acpi/piix4.c
> +++ b/hw/acpi/piix4.c
> @@ -30,6 +30,7 @@
>  #include "hw/nvram/fw_cfg.h"
>  #include "exec/address-spaces.h"
>  #include "hw/acpi/piix4.h"
> +#include "hw/acpi/pcihp.h"
>  
>  //#define DEBUG
>  
> @@ -73,7 +74,6 @@ typedef struct PIIX4PMState {
>      uint32_t io_base;
>  
>      MemoryRegion io_gpe;
> -    MemoryRegion io_pci;
>      MemoryRegion io_cpu;
>      ACPIREGS ar;
>  
> @@ -88,11 +88,16 @@ typedef struct PIIX4PMState {
>      Notifier machine_ready;
>      Notifier powerdown_notifier;
>  
> -    /* for pci hotplug */
> +    /* for legacy pci hotplug (compatible with qemu 1.6 and older) */
> +    MemoryRegion io_pci;
>      struct pci_status pci0_status;
>      uint32_t pci0_hotplug_enable;
>      uint32_t pci0_slot_device_present;
>  
> +    /* for new pci hotplug (with PCI2PCI bridge support) */
> +    AcpiPciHpState acpi_pci_hotplug;
pcihp therm collides with linux's pcihp driver that is used with native PCIE
hotplug, which makes code a bit confusing at first.

perhaps replacing "pcihp" through out with more verbose "pci_hotplug" would be
better?

> +    bool use_acpi_pci_hotplug;
> +
>      uint8_t disable_s3;
>      uint8_t disable_s4;
>      uint8_t s4_val;
> @@ -282,6 +287,18 @@ static int acpi_load_old(QEMUFile *f, void *opaque, int version_id)
>      return ret;
>  }
>  
> +static bool vmstate_test_use_acpi_pci_hotplug(void *opaque, int version_id)
> +{
> +    PIIX4PMState *s = opaque;
> +    return s->use_acpi_pci_hotplug;
> +}
> +
> +static bool vmstate_test_no_use_acpi_pci_hotplug(void *opaque, int version_id)
> +{
> +    PIIX4PMState *s = opaque;
> +    return !s->use_acpi_pci_hotplug;
> +}
> +
>  /* qemu-kvm 1.2 uses version 3 but advertised as 2
>   * To support incoming qemu-kvm 1.2 migration, change version_id
>   * and minimum_version_id to 2 below (which breaks migration from
> @@ -304,8 +321,12 @@ static const VMStateDescription vmstate_acpi = {
>          VMSTATE_TIMER(ar.tmr.timer, PIIX4PMState),
>          VMSTATE_INT64(ar.tmr.overflow_time, PIIX4PMState),
>          VMSTATE_STRUCT(ar.gpe, PIIX4PMState, 2, vmstate_gpe, ACPIGPE),
> -        VMSTATE_STRUCT(pci0_status, PIIX4PMState, 2, vmstate_pci_status,
> -                       struct pci_status),
> +        VMSTATE_STRUCT_TEST(pci0_status, PIIX4PMState,
> +                            vmstate_test_no_use_acpi_pci_hotplug,
> +                            2, vmstate_pci_status,
> +                            struct pci_status),
> +        VMSTATE_PCI_HOTPLUG(acpi_pci_hotplug, PIIX4PMState,
> +                            vmstate_test_use_acpi_pci_hotplug),
>          VMSTATE_END_OF_LIST()
>      }
>  };
> @@ -383,7 +404,11 @@ static void piix4_reset(void *opaque)
>          pci_conf[0x5B] = 0x02;
>      }
>      pm_io_space_update(s);
> -    piix4_update_hotplug(s);
> +    if (s->use_acpi_pci_hotplug) {
> +        acpi_pcihp_reset(&s->acpi_pci_hotplug);
> +    } else {
> +        piix4_update_hotplug(s);
> +    }
>  }
>  
>  static void piix4_pm_powerdown_req(Notifier *n, void *opaque)
> @@ -394,6 +419,26 @@ static void piix4_pm_powerdown_req(Notifier *n, void *opaque)
>      acpi_pm1_evt_power_down(&s->ar);
>  }
>  
> +static int piix4_acpi_pci_hotplug(DeviceState *qdev, PCIDevice *dev,
> +                                  PCIHotplugState state)
> +{
> +    PIIX4PMState *s = PIIX4_PM(qdev);
> +    int ret = acpi_pcihp_device_hotplug(&s->acpi_pci_hotplug, dev, state);
> +    if (ret < 0) {
> +        return ret;
> +    }
> +    s->ar.gpe.sts[0] |= PIIX4_PCI_HOTPLUG_STATUS;
> +
> +    pm_update_sci(s);
> +    return 0;
> +}
> +
> +static void piix4_update_bus_hotplug(PCIBus *bus, void *opaque)
> +{
> +    PIIX4PMState *s = opaque;
> +    pci_bus_hotplug(bus, piix4_acpi_pci_hotplug, DEVICE(s));
> +}
> +
>  static void piix4_pm_machine_ready(Notifier *n, void *opaque)
>  {
>      PIIX4PMState *s = container_of(n, PIIX4PMState, machine_ready);
> @@ -407,6 +452,10 @@ static void piix4_pm_machine_ready(Notifier *n, void *opaque)
>      pci_conf[0x63] = 0x60;
>      pci_conf[0x67] = (memory_region_present(io_as, 0x3f8) ? 0x08 : 0) |
>          (memory_region_present(io_as, 0x2f8) ? 0x90 : 0);
> +
> +    if (s->use_acpi_pci_hotplug) {
> +        pci_for_each_bus(d->bus, piix4_update_bus_hotplug, s);
why do you need to do it dinamically?

> +    }
>  }
>  
>  static void piix4_pm_add_propeties(PIIX4PMState *s)
> @@ -528,6 +577,8 @@ static Property piix4_pm_properties[] = {
>      DEFINE_PROP_UINT8(ACPI_PM_PROP_S3_DISABLED, PIIX4PMState, disable_s3, 0),
>      DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_DISABLED, PIIX4PMState, disable_s4, 0),
>      DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_VAL, PIIX4PMState, s4_val, 2),
> +    DEFINE_PROP_BOOL("acpi-pci-hotplug-with-bridge-support", PIIX4PMState,
> +                     use_acpi_pci_hotplug, true),
>      DEFINE_PROP_END_OF_LIST(),
>  };
>  
> @@ -716,11 +767,15 @@ static void piix4_acpi_system_hot_add_init(MemoryRegion *parent,
>                            "acpi-gpe0", GPE_LEN);
>      memory_region_add_subregion(parent, GPE_BASE, &s->io_gpe);
>  
> -    memory_region_init_io(&s->io_pci, OBJECT(s), &piix4_pci_ops, s,
> -                          "acpi-pci-hotplug", PCI_HOTPLUG_SIZE);
> -    memory_region_add_subregion(parent, PCI_HOTPLUG_ADDR,
> -                                &s->io_pci);
> -    pci_bus_hotplug(bus, piix4_device_hotplug, DEVICE(s));
> +    if (s->use_acpi_pci_hotplug) {
> +        acpi_pcihp_init(&s->acpi_pci_hotplug, bus, parent);
> +    } else {
> +        memory_region_init_io(&s->io_pci, OBJECT(s), &piix4_pci_ops, s,
> +                              "acpi-pci-hotplug", PCI_HOTPLUG_SIZE);
> +        memory_region_add_subregion(parent, PCI_HOTPLUG_ADDR,
> +                                    &s->io_pci);
> +        pci_bus_hotplug(bus, piix4_device_hotplug, DEVICE(s));
> +    }
>  
>      CPU_FOREACH(cpu) {
>          CPUClass *cc = CPU_GET_CLASS(cpu);
> -- 
> MST
> 
> 


-- 
Regards,
  Igor