Re: [Qemu-devel] [PATCH v3 12/39] pci: allow I/O BARs to be registered with pci_register_bar_region()

[Anthony Liguori <anthony@codemonkey.ws>]

On 08/04/2011 08:06 AM, Avi Kivity wrote:
> Reviewed-by: Richard Henderson<rth@twiddle.net>
> Signed-off-by: Avi Kivity<avi@redhat.com>

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>

Regards,

Anthony Liguori

> ---
>   hw/pci.c           |   43 +++++++++++++++++++++++--------------------
>   hw/pci.h           |    1 +
>   hw/pci_internals.h |    3 ++-
>   3 files changed, 26 insertions(+), 21 deletions(-)
>
> diff --git a/hw/pci.c b/hw/pci.c
> index 2659d96..980840f 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -271,7 +271,8 @@ void pci_bus_new_inplace(PCIBus *bus, DeviceState *parent,
>       qbus_create_inplace(&bus->qbus,&pci_bus_info, parent, name);
>       assert(PCI_FUNC(devfn_min) == 0);
>       bus->devfn_min = devfn_min;
> -    bus->address_space = address_space_mem;
> +    bus->address_space_mem = address_space_mem;
> +    bus->address_space_io = address_space_io;
>
>       /* host bridge */
>       QLIST_INIT(&bus->child);
> @@ -847,12 +848,11 @@ static void pci_unregister_io_regions(PCIDevice *pci_dev)
>           r =&pci_dev->io_regions[i];
>           if (!r->size || r->addr == PCI_BAR_UNMAPPED)
>               continue;
> -        if (r->type == PCI_BASE_ADDRESS_SPACE_IO) {
> -            isa_unassign_ioport(r->addr, r->filtered_size);
> +        if (r->memory) {
> +            memory_region_del_subregion(r->address_space, r->memory);
>           } else {
> -            if (r->memory) {
> -                memory_region_del_subregion(pci_dev->bus->address_space,
> -                                            r->memory);
> +            if (r->type == PCI_BASE_ADDRESS_SPACE_IO) {
> +                isa_unassign_ioport(r->addr, r->filtered_size);
>               } else {
>                   cpu_register_physical_memory(pci_to_cpu_addr(pci_dev->bus,
>                                                                r->addr),
> @@ -934,9 +934,11 @@ static void pci_simple_bar_mapfunc_region(PCIDevice *pci_dev, int region_num,
>                                             pcibus_t addr, pcibus_t size,
>                                             int type)
>   {
> -    memory_region_add_subregion_overlap(pci_dev->bus->address_space,
> +    PCIIORegion *r =&pci_dev->io_regions[region_num];
> +
> +    memory_region_add_subregion_overlap(r->address_space,
>                                           addr,
> -                                        pci_dev->io_regions[region_num].memory,
> +                                        r->memory,
>                                           1);
>   }
>
> @@ -953,9 +955,13 @@ void pci_register_bar_region(PCIDevice *pci_dev, int region_num,
>                                uint8_t attr, MemoryRegion *memory)
>   {
>       pci_register_bar(pci_dev, region_num, memory_region_size(memory),
> -                     PCI_BASE_ADDRESS_SPACE_MEMORY | attr,
> +                     attr,
>                        pci_simple_bar_mapfunc_region);
>       pci_dev->io_regions[region_num].memory = memory;
> +    pci_dev->io_regions[region_num].address_space
> +        = attr&  PCI_BASE_ADDRESS_SPACE_IO
> +        ? pci_dev->bus->address_space_io
> +        : pci_dev->bus->address_space_mem;
>   }
>
>   pcibus_t pci_get_bar_addr(PCIDevice *pci_dev, int region_num)
> @@ -1090,7 +1096,9 @@ static void pci_update_mappings(PCIDevice *d)
>
>           /* now do the real mapping */
>           if (r->addr != PCI_BAR_UNMAPPED) {
> -            if (r->type&  PCI_BASE_ADDRESS_SPACE_IO) {
> +            if (r->memory) {
> +                memory_region_del_subregion(r->address_space, r->memory);
> +            } else if (r->type&  PCI_BASE_ADDRESS_SPACE_IO) {
>                   int class;
>                   /* NOTE: specific hack for IDE in PC case:
>                      only one byte must be mapped. */
> @@ -1101,16 +1109,11 @@ static void pci_update_mappings(PCIDevice *d)
>                       isa_unassign_ioport(r->addr, r->filtered_size);
>                   }
>               } else {
> -                if (r->memory) {
> -                    memory_region_del_subregion(d->bus->address_space,
> -                                                r->memory);
> -                } else {
> -                    cpu_register_physical_memory(pci_to_cpu_addr(d->bus,
> -                                                                 r->addr),
> -                                                 r->filtered_size,
> -                                                 IO_MEM_UNASSIGNED);
> -                    qemu_unregister_coalesced_mmio(r->addr, r->filtered_size);
> -                }
> +                cpu_register_physical_memory(pci_to_cpu_addr(d->bus,
> +                                                             r->addr),
> +                                             r->filtered_size,
> +                                             IO_MEM_UNASSIGNED);
> +                qemu_unregister_coalesced_mmio(r->addr, r->filtered_size);
>               }
>           }
>           r->addr = new_addr;
> diff --git a/hw/pci.h b/hw/pci.h
> index 45b30fa..928e96c 100644
> --- a/hw/pci.h
> +++ b/hw/pci.h
> @@ -95,6 +95,7 @@ typedef struct PCIIORegion {
>       PCIMapIORegionFunc *map_func;
>       ram_addr_t ram_addr;
>       MemoryRegion *memory;
> +    MemoryRegion *address_space;
>   } PCIIORegion;
>
>   #define PCI_ROM_SLOT 6
> diff --git a/hw/pci_internals.h b/hw/pci_internals.h
> index c3a463a..c7fd23d 100644
> --- a/hw/pci_internals.h
> +++ b/hw/pci_internals.h
> @@ -25,7 +25,8 @@ struct PCIBus {
>       PCIDevice *devices[PCI_SLOT_MAX * PCI_FUNC_MAX];
>       PCIDevice *parent_dev;
>       target_phys_addr_t mem_base;
> -    MemoryRegion *address_space;
> +    MemoryRegion *address_space_mem;
> +    MemoryRegion *address_space_io;
>
>       QLIST_HEAD(, PCIBus) child; /* this will be replaced by qdev later */
>       QLIST_ENTRY(PCIBus) sibling;/* this will be replaced by qdev later */