Re: [Qemu-devel] [RFC 8/9] pcihp: expose PCI hotplug MMIO base/length as properties of piix4pm

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Feb 07, 2014 at 01:51:35PM +0100, Igor Mammedov wrote:
> with introduction of PCIHP, MMIO range becomes changable
> at runtime so it's not possible to statically punch hole
> PCI bus _CRS.
> 
> Making IO base/length available as readonly properties
> allow acpi builder to get values and reserve PCI hotplug
> IO range at runtime later.
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>

No objection but I wonder: isn't it already possible to enumerate
memory regions?

> ---
>  hw/acpi/pcihp.c         |   28 ++++++++++++++++++++++++++++
>  hw/acpi/piix4.c         |    1 +
>  include/hw/acpi/pcihp.h |    4 ++++
>  3 files changed, 33 insertions(+), 0 deletions(-)
> 
> diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
> index 1ce6fc2..629d364 100644
> --- a/hw/acpi/pcihp.c
> +++ b/hw/acpi/pcihp.c
> @@ -37,6 +37,7 @@
>  #include "hw/pci/pci_bus.h"
>  #include "qom/qom-qobject.h"
>  #include "qapi/qmp/qint.h"
> +#include "qapi/visitor.h"
>  
>  //#define DEBUG
>  
> @@ -309,3 +310,30 @@ const VMStateDescription vmstate_acpi_pcihp_pci_status = {
>          VMSTATE_END_OF_LIST()
>      }
>  };
> +
> +static void acpi_pcihp_get_io_addr(Object *obj, Visitor *v, void *opaque,
> +                                     const char *name, Error **errp)
> +{
> +    AcpiPciHpState *s = opaque;
> +    MemoryRegionSection mr_info = memory_region_find(&s->io, 0, 1);
> +    uint16_t value = mr_info.offset_within_address_space;
> +
> +    visit_type_uint16(v, &value, name, errp);
> +}
> +
> +static void acpi_pcihp_get_io_len(Object *obj, Visitor *v, void *opaque,
> +                                     const char *name, Error **errp)
> +{
> +    AcpiPciHpState *s = opaque;
> +    uint16_t value = memory_region_size(&s->io);
> +
> +    visit_type_uint16(v, &value, name, errp);
> +}
> +
> +void acpi_pcihp_add_mmio_properties(Object *obj, AcpiPciHpState *s)
> +{
> +    object_property_add(obj, ACPI_PCIHP_IO_ADDR, "uint16",
> +                        acpi_pcihp_get_io_addr, NULL, NULL, s, NULL);
> +    object_property_add(obj, ACPI_PCIHP_IO_LEN, "uint16",
> +                        acpi_pcihp_get_io_len, NULL, NULL, s, NULL);
> +}
> diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
> index 7a0efcb..034c5cd 100644
> --- a/hw/acpi/piix4.c
> +++ b/hw/acpi/piix4.c
> @@ -558,6 +558,7 @@ static void piix4_acpi_system_hot_add_init(MemoryRegion *parent,
>                            "acpi-gpe0", GPE_LEN);
>      memory_region_add_subregion(parent, GPE_BASE, &s->io_gpe);
>  
> +    acpi_pcihp_add_mmio_properties(OBJECT(s), &s->acpi_pci_hotplug);
>      acpi_pcihp_init(&s->acpi_pci_hotplug, bus, parent,
>                      s->use_acpi_pci_hotplug);
>  
> diff --git a/include/hw/acpi/pcihp.h b/include/hw/acpi/pcihp.h
> index 0a90e4a..0eb4e1c 100644
> --- a/include/hw/acpi/pcihp.h
> +++ b/include/hw/acpi/pcihp.h
> @@ -70,4 +70,8 @@ extern const VMStateDescription vmstate_acpi_pcihp_pci_status;
>                                    vmstate_acpi_pcihp_pci_status, \
>                                    AcpiPciHpPciStatus)
>  
> +#define ACPI_PCIHP_IO_ADDR "pcihp-io-addr"
> +#define ACPI_PCIHP_IO_LEN  "pcihp-io-len"
> +
> +void acpi_pcihp_add_mmio_properties(Object *obj, AcpiPciHpState *s);
>  #endif
> -- 
> 1.7.1