[Qemu-devel] Re: [PATCH V5 16/29] pci: 64bit bar support.

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

On Fri, Oct 09, 2009 at 03:28:49PM +0900, Isaku Yamahata wrote:
> implemented pci 64bit bar support.
> 
> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
> ---
>  hw/pci.c |   34 +++++++++++++++++++++++++++++-----
>  hw/pci.h |    2 ++
>  2 files changed, 31 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/pci.c b/hw/pci.c
> index e7f8fb4..ee3ab05 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -454,6 +454,13 @@ static int pci_unregister_device(DeviceState *dev)
>      return 0;
>  }
>  
> +static inline int pci_bar_is_mem64(const PCIIORegion *r)
> +{
> +    return !(r->type & PCI_BASE_ADDRESS_SPACE_IO) &&
> +        (r->type & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
> +        PCI_BASE_ADDRESS_MEM_TYPE_64;
> +}
> +

This should be just 
return r->type & PCI_BASE_ADDRESS_MEM_TYPE_64
and then this can be open-coded.
PCI_BASE_ADDRESS_MEM_TYPE_MASK will also not be needed.

I have a feeling I said this already, and the spec is pretty
clear: there is exactly 1 bit that means 64 bit memory.
No reason to check anything else.

>  void pci_register_bar(PCIDevice *pci_dev, int region_num,
>                              pcibus_t size, int type,
>                              PCIMapIORegionFunc *map_func)
> @@ -484,8 +491,13 @@ void pci_register_bar(PCIDevice *pci_dev, int region_num,
>          wmask |= PCI_ROM_ADDRESS_ENABLE;
>      }
>      pci_set_long(pci_dev->config + addr, type);
> -    pci_set_long(pci_dev->wmask + addr, wmask & 0xffffffff);
> -    pci_set_long(pci_dev->cmask + addr, 0xffffffff);
> +    if (pci_bar_is_mem64(r)) {
> +        pci_set_quad(pci_dev->wmask + addr, wmask);
> +        pci_set_quad(pci_dev->cmask + addr, ~0ULL);
> +    } else {
> +        pci_set_long(pci_dev->wmask + addr, wmask & 0xffffffff);
> +        pci_set_long(pci_dev->cmask + addr, 0xffffffff);
> +    }
>  }
>  
>  static void pci_update_mappings(PCIDevice *d)
> @@ -513,7 +525,11 @@ static void pci_update_mappings(PCIDevice *d)
>                  }
>              } else {
>                  if (cmd & PCI_COMMAND_MEMORY) {
> -                    new_addr = pci_get_long(d->config + pci_bar(d, i));
> +                    if (pci_bar_is_mem64(r)) {
> +                        new_addr = pci_get_quad(d->config + pci_bar(d, i));
> +                    } else {
> +                        new_addr = pci_get_long(d->config + pci_bar(d, i));
> +                    }
>                      /* the ROM slot has a specific enable bit */
>                      if (i == PCI_ROM_SLOT && !(new_addr & PCI_ROM_ADDRESS_ENABLE))
>                          goto no_mem_map;
> @@ -531,7 +547,7 @@ static void pci_update_mappings(PCIDevice *d)
>                           * Without this, PC ide doesn't work well.
>                           * TODO: remove this work around.
>                           */
> -                        last_addr >= UINT32_MAX) {
> +                        (!pci_bar_is_mem64(r) && last_addr >= UINT32_MAX)) {
>                          new_addr = PCI_BAR_UNMAPPED;
>                      }
>                  } else {
> @@ -773,8 +789,16 @@ static void pci_info_device(PCIDevice *d)
>                                 " [0x%04"FMT_PCIBUS"].\n",
>                                 r->addr, r->addr + r->size - 1);
>              } else {
> -                monitor_printf(mon, "32 bit memory at 0x%08"FMT_PCIBUS
> +                const char *type = pci_bar_is_mem64(r)? "64 bit": "32 bit";
> +                const char *prefetch = "";
> +
> +                if (r->type & PCI_BASE_ADDRESS_MEM_PREFETCH) {
> +                    prefetch = " prefetchable";
> +                }
> +
> +                monitor_printf(mon, "%s%s memory at 0x%08"FMT_PCIBUS
>                                 " [0x%08"FMT_PCIBUS"].\n",
> +                               type, prefetch,
>                                 r->addr, r->addr + r->size - 1);
>              }
>          }
> diff --git a/hw/pci.h b/hw/pci.h
> index 8fbd45e..269981a 100644
> --- a/hw/pci.h
> +++ b/hw/pci.h
> @@ -114,6 +114,8 @@ typedef struct PCIIORegion {
>  #define PCI_BASE_ADDRESS_0	0x10	/* 32 bits */
>  #define  PCI_BASE_ADDRESS_SPACE_IO	0x01
>  #define  PCI_BASE_ADDRESS_SPACE_MEMORY	0x00
> +#define  PCI_BASE_ADDRESS_MEM_TYPE_MASK	0x06
> +#define  PCI_BASE_ADDRESS_MEM_TYPE_64	0x04	/* 64 bit address */
>  #define  PCI_BASE_ADDRESS_MEM_PREFETCH	0x08	/* prefetchable? */
>  #define PCI_PRIMARY_BUS		0x18	/* Primary bus number */
>  #define PCI_SECONDARY_BUS	0x19	/* Secondary bus number */
> -- 
> 1.6.0.2