Re: [Qemu-devel] [PATCH v3 6/8] megasas: remove unnecessary megasas_use_msix()

[Markus Armbruster <armbru@redhat.com>]

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

> CC: Hannes Reinecke <hare@suse.de>
> CC: Paolo Bonzini <pbonzini@redhat.com>
> CC: Markus Armbruster <armbru@redhat.com>
> CC: Marcel Apfelbaum <marcel@redhat.com>
> CC: Michael S. Tsirkin <mst@redhat.com>
> Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
> ---
>  hw/scsi/megasas.c | 21 +++++++--------------
>  1 file changed, 7 insertions(+), 14 deletions(-)
>
> diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
> index d801dd0..90cd873 100644
> --- a/hw/scsi/megasas.c
> +++ b/hw/scsi/megasas.c
> @@ -155,11 +155,6 @@ static bool megasas_use_queue64(MegasasState *s)
>      return s->flags & MEGASAS_MASK_USE_QUEUE64;
>  }
>  
> -static bool megasas_use_msix(MegasasState *s)
> -{
> -    return s->msix != ON_OFF_AUTO_OFF;
> -}
> -
>  static bool megasas_is_jbod(MegasasState *s)
>  {
>      return s->flags & MEGASAS_MASK_USE_JBOD;
> @@ -2295,9 +2290,7 @@ static void megasas_scsi_uninit(PCIDevice *d)
>  {
>      MegasasState *s = MEGASAS(d);
>  
> -    if (megasas_use_msix(s)) {
> -        msix_uninit(d, &s->mmio_io, &s->mmio_io);
> -    }
> +    msix_uninit(d, &s->mmio_io, &s->mmio_io);
>      msi_uninit(d);
>  }
>  
> @@ -2349,7 +2342,7 @@ static void megasas_scsi_realize(PCIDevice *dev, Error **errp)
>  
>      memory_region_init_io(&s->mmio_io, OBJECT(s), &megasas_mmio_ops, s,
>                            "megasas-mmio", 0x4000);
> -    if (megasas_use_msix(s)) {
> +    if (s->msix != ON_OFF_AUTO_OFF) {
>          ret = msix_init(dev, 15, &s->mmio_io, b->mmio_bar, 0x2000,
>                          &s->mmio_io, b->mmio_bar, 0x3800, 0x68, &err);
>          /* Any error other than -ENOTSUP(board's MSI support is broken)
> @@ -2364,11 +2357,15 @@ static void megasas_scsi_realize(PCIDevice *dev, Error **errp)
>              error_propagate(errp, err);
>              return;
>          }
> -        assert(!err || d->msix == ON_OFF_AUTO_AUTO);
> +        assert(!err || s->msix == ON_OFF_AUTO_AUTO);

You add this line in PATCH 4.  Could it use s->msix from the start?

>          /* With msix=auto, we fall back to MSI off silently */
>          error_free(err);
>      }
>  
> +    if (msix_enabled(dev)) {
> +        msix_vector_use(dev, 0);
> +    }
> +
>      memory_region_init_io(&s->port_io, OBJECT(s), &megasas_port_ops, s,
>                            "megasas-io", 256);
>      memory_region_init_io(&s->queue_io, OBJECT(s), &megasas_queue_ops, s,
> @@ -2384,10 +2381,6 @@ static void megasas_scsi_realize(PCIDevice *dev, Error **errp)
>      pci_register_bar(dev, b->mmio_bar, bar_type, &s->mmio_io);
>      pci_register_bar(dev, 3, bar_type, &s->queue_io);
>  
> -    if (megasas_use_msix(s)) {
> -        msix_vector_use(dev, 0);
> -    }
> -
>      s->fw_state = MFI_FWSTATE_READY;
>      if (!s->sas_addr) {
>          s->sas_addr = ((NAA_LOCALLY_ASSIGNED_ID << 24) |

Can you explain why you move the code?