Re: [Qemu-devel] [PATCH v6 07/11] intel-hda: change msi property type

[Markus Armbruster <armbru@redhat.com>]

Cao jin <caoj.fnst@cn.fujitsu.com> writes:

>>From uint32 to enum OnOffAuto.
>
> cc: Gerd Hoffmann <kraxel@redhat.com>
> cc: Michael S. Tsirkin <mst@redhat.com>
> cc: Markus Armbruster <armbru@redhat.com>
> cc: Marcel Apfelbaum <marcel@redhat.com>
>
> Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
> ---
>  hw/audio/intel-hda.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/hw/audio/intel-hda.c b/hw/audio/intel-hda.c
> index d372d4a..61362e5 100644
> --- a/hw/audio/intel-hda.c
> +++ b/hw/audio/intel-hda.c
> @@ -187,7 +187,7 @@ struct IntelHDAState {
>  
>      /* properties */
>      uint32_t debug;
> -    uint32_t msi;
> +    OnOffAuto msi;

I'm going to review all uses of this member.

>      bool old_msi_addr;
>  };
>  
> @@ -1142,7 +1142,8 @@ static void intel_hda_realize(PCIDevice *pci, Error **errp)
>      memory_region_init_io(&d->mmio, OBJECT(d), &intel_hda_mmio_ops, d,
>                            "intel-hda", 0x4000);
>      pci_register_bar(&d->pci, 0, 0, &d->mmio);
> -    if (d->msi) {
> +    if (d->msi == ON_OFF_AUTO_AUTO ||
> +        d->msi == ON_OFF_AUTO_ON) {
>          msi_init(&d->pci, d->old_msi_addr ? 0x50 : 0x60, 1, true, false);

Same suggestions as for PATCH 06:

* Use the d->msi != ON_OFF_AUTO_OFF
* Add /* TODO check for errors */ now, drop it when you add the check in
  PATCH 11.

>      }
>  
> @@ -1234,7 +1235,7 @@ static const VMStateDescription vmstate_intel_hda = {
>  
>  static Property intel_hda_properties[] = {
>      DEFINE_PROP_UINT32("debug", IntelHDAState, debug, 0),
> -    DEFINE_PROP_UINT32("msi", IntelHDAState, msi, 1),
> +    DEFINE_PROP_ON_OFF_AUTO("msi", IntelHDAState, msi, ON_OFF_AUTO_AUTO),
>      DEFINE_PROP_BOOL("old_msi_addr", IntelHDAState, old_msi_addr, false),
>      DEFINE_PROP_END_OF_LIST(),
>  };

Not covered:

   static void intel_hda_update_irq(IntelHDAState *d)
   {
-->    int msi = d->msi && msi_enabled(&d->pci);
       int level;

       intel_hda_update_int_sts(d);
       if (d->int_sts & (1U << 31) && d->int_ctl & (1U << 31)) {
           level = 1;
       } else {
           level = 0;
       }
       dprint(d, 2, "%s: level %d [%s]\n", __FUNCTION__,
              level, msi ? "msi" : "intx");
       if (msi) {
           if (level) {
               msi_notify(&d->pci, 0);
           }
       } else {
           pci_set_irq(&d->pci, level);
       }
   }

This is wrong, because the meaning of the test changes from

    (user didn't specify msi=off) && (guest enabled MSI)

to

    (user didn't specify msi=on or msi=off) && (guest enabled MSI)

What about:

       int msi = msi_enabled(&d->pci);

If I understand it correctly, it can only be true when we added MSI
capability, and we do that only when msi=auto (default) or msi=on.