[Qemu-devel] Re: [PATCHv3 08/14] Add get_fw_dev_path callback for pci bus.

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

On Wed, Nov 10, 2010 at 07:14:15PM +0200, Gleb Natapov wrote:
> 
> Signed-off-by: Gleb Natapov <gleb@redhat.com>

Good stuff. We should also consider using this for
CLI and monitor. Some comments below.

> ---
>  hw/pci.c |   54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 54 insertions(+), 0 deletions(-)
> 
> diff --git a/hw/pci.c b/hw/pci.c
> index 92aaa85..ab0399c 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -63,12 +63,14 @@ struct PCIBus {
>  
>  static void pcibus_dev_print(Monitor *mon, DeviceState *dev, int indent);
>  static char *pcibus_get_dev_path(DeviceState *dev);
> +static char *pcibus_get_fw_dev_path(DeviceState *dev);
>  
>  static struct BusInfo pci_bus_info = {
>      .name       = "PCI",
>      .size       = sizeof(PCIBus),
>      .print_dev  = pcibus_dev_print,
>      .get_dev_path = pcibus_get_dev_path,
> +    .get_fw_dev_path = pcibus_get_fw_dev_path,
>      .props      = (Property[]) {
>          DEFINE_PROP_PCI_DEVFN("addr", PCIDevice, devfn, -1),
>          DEFINE_PROP_STRING("romfile", PCIDevice, romfile),
> @@ -2135,6 +2137,58 @@ static void pcibus_dev_print(Monitor *mon, DeviceState *dev, int indent)
>      }
>  }
>  
> +static char *pci_dev_fw_name(DeviceState *dev, char *buf, int len)
> +{
> +    PCIDevice *d = (PCIDevice *)dev;
> +    const char *name = NULL;
> +
> +#define E(R, N) case R: name = N; break;

Straight from underhanded C contest :).
Does this macro really buy us all that much?
Split this switch to an inline function, we'll get
	case 0x0600:  return "host";
and then we won't need the macro.

> +
> +    /* names taken from pci binding for open firmware */
> +    switch (pci_get_word(d->config + PCI_CLASS_DEVICE)) {
> +        E(0x0001, "display"); E(0x0100, "scsi"); E(0x0101, "ide");
> +        E(0x0102, "fdc"); E(0x0103, "ipi"); E(0x0104, "raid");
> +        E(0x0200, "ethernet"); E(0x0201, "token-ring");  E(0x0202, "fddi");
> +        E(0x0203, "atm"); E(0x0300 ... 0x03ff, "display"); E(0x0400, "video");
> +        E(0x0401, "sound"); E(0x0500, "memory"); E(0x0501, "flash");
> +        E(0x0600, "host"); E(0x0601, "isa"); E(0x0602, "eisa");
> +        E(0x0603, "mca"); E(0x0604, "pci"); E(0x0605, "pcmcia");
> +        E(0x0606, "nubus"); E(0x0607, "cardbus"); E(0x0700, "serial");
> +        E(0x0701, "parallel"); E(0x0800, "interrupt-controller");
> +        E(0x0801, "dma-controller"); E(0x0802, "timer");
> +        E(0x0803, "rtc"); E(0x0900, "keyboard"); E(0x0901, "pen");
> +        E(0x0902, "mouse"); E(0x0a00 ... 0x0aff, "dock");
> +        E(0x0b00 ... 0x0bff, "cpu"); E(0x0c00, "fireware");
> +        E(0x0c01, "access-bus"); E(0x0c02, "ssa"); E(0x0c03, "usb");
> +        E(0x0c04, "fibre-channel");

Please use constants from
hw/pci_ids.h


> +    }
> +#undef E
> +
> +    if (name) {
> +        pstrcpy(buf, len, name);
> +    } else {
> +        snprintf(buf, len, "pci%04x,%04x",
> +                 pci_get_word(d->config + PCI_VENDOR_ID),
> +                 pci_get_word(d->config + PCI_DEVICE_ID));
> +    }
> +
> +    return buf;
> +}
> +
> +static char *pcibus_get_fw_dev_path(DeviceState *dev)
> +{
> +    PCIDevice *d = (PCIDevice *)dev;
> +    char path[50], name[33];
> +    int off;
> +
> +    off = snprintf(path, sizeof(path), "%s@%x",
> +                   pci_dev_fw_name(dev, name, sizeof name),
> +                   PCI_SLOT(d->devfn));
> +    if (PCI_FUNC(d->devfn))
> +        snprintf(path + off, sizeof(path) + off, ",%x", PCI_FUNC(d->devfn));
> +    return strdup(path);
> +}
> +
>  static char *pcibus_get_dev_path(DeviceState *dev)
>  {
>      PCIDevice *d = (PCIDevice *)dev;
> -- 
> 1.7.1