Re: [Qemu-devel] [Qemu-ppc] [PATCH 4/5] spapr: Remove unnecessary differences between hotplug and coldplug paths

[Laurent Vivier <lvivier@redhat.com>]

On 20/06/2017 03:53, David Gibson wrote:
> spapr_drc_attach() has a 'coldplug' parameter which sets the DRC into
> configured state initially, instead of the usual ISOLATED/UNUSABLE state.
> It turns out this is unnecessary: although coldplugged devices do need to
> be in CONFIGURED state once the guest starts, that will already be
> accomplished by the reset code which will move DRCs for already plugged
> devices into a coldplug equivalent state.
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Reviewed-by: Laurent Vivier <lvivier@redhat.com>

> ---
>  hw/ppc/spapr.c             | 13 +++----------
>  hw/ppc/spapr_drc.c         |  5 ++---
>  hw/ppc/spapr_pci.c         |  3 +--
>  include/hw/ppc/spapr_drc.h |  2 +-
>  4 files changed, 7 insertions(+), 16 deletions(-)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index f12bc4d..35f2d4b 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -2611,7 +2611,7 @@ static void spapr_add_lmbs(DeviceState *dev, uint64_t addr_start, uint64_t size,
>          fdt_offset = spapr_populate_memory_node(fdt, node, addr,
>                                                  SPAPR_MEMORY_BLOCK_SIZE);
>  
> -        spapr_drc_attach(drc, dev, fdt, fdt_offset, !dev->hotplugged, errp);
> +        spapr_drc_attach(drc, dev, fdt, fdt_offset, errp);
>          addr += SPAPR_MEMORY_BLOCK_SIZE;
>      }
>      /* send hotplug notification to the
> @@ -2955,17 +2955,10 @@ static void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
>  
>      g_assert(drc || !mc->has_hotpluggable_cpus);
>  
> -    /*
> -     * Setup CPU DT entries only for hotplugged CPUs. For boot time or
> -     * coldplugged CPUs DT entries are setup in spapr_build_fdt().
> -     */
> -    if (dev->hotplugged) {
> -        fdt = spapr_populate_hotplug_cpu_dt(cs, &fdt_offset, spapr);
> -    }
> +    fdt = spapr_populate_hotplug_cpu_dt(cs, &fdt_offset, spapr);
>  
>      if (drc) {
> -        spapr_drc_attach(drc, dev, fdt, fdt_offset, !dev->hotplugged,
> -                         &local_err);
> +        spapr_drc_attach(drc, dev, fdt, fdt_offset, &local_err);
>          if (local_err) {
>              g_free(fdt);
>              error_propagate(errp, local_err);
> diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
> index 32e39f2..e70879a 100644
> --- a/hw/ppc/spapr_drc.c
> +++ b/hw/ppc/spapr_drc.c
> @@ -340,7 +340,7 @@ static void prop_get_fdt(Object *obj, Visitor *v, const char *name,
>  }
>  
>  void spapr_drc_attach(sPAPRDRConnector *drc, DeviceState *d, void *fdt,
> -                      int fdt_start_offset, bool coldplug, Error **errp)
> +                      int fdt_start_offset, Error **errp)
>  {
>      trace_spapr_drc_attach(spapr_drc_index(drc));
>  
> @@ -351,12 +351,11 @@ void spapr_drc_attach(sPAPRDRConnector *drc, DeviceState *d, void *fdt,
>      if (spapr_drc_type(drc) == SPAPR_DR_CONNECTOR_TYPE_PCI) {
>          g_assert(drc->allocation_state == SPAPR_DR_ALLOCATION_STATE_USABLE);
>      }
> -    g_assert(fdt || coldplug);
> +    g_assert(fdt);
>  
>      drc->dev = d;
>      drc->fdt = fdt;
>      drc->fdt_start_offset = fdt_start_offset;
> -    drc->configured = coldplug;
>  
>      if (spapr_drc_type(drc) != SPAPR_DR_CONNECTOR_TYPE_PCI) {
>          drc->awaiting_allocation = true;
> diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
> index 0b447f2..f2543ef 100644
> --- a/hw/ppc/spapr_pci.c
> +++ b/hw/ppc/spapr_pci.c
> @@ -1435,8 +1435,7 @@ static void spapr_phb_hot_plug_child(HotplugHandler *plug_handler,
>          goto out;
>      }
>  
> -    spapr_drc_attach(drc, DEVICE(pdev), fdt, fdt_start_offset,
> -                     !plugged_dev->hotplugged, &local_err);
> +    spapr_drc_attach(drc, DEVICE(pdev), fdt, fdt_start_offset, &local_err);
>      if (local_err) {
>          goto out;
>      }
> diff --git a/include/hw/ppc/spapr_drc.h b/include/hw/ppc/spapr_drc.h
> index 6fd84d1..d15e9eb 100644
> --- a/include/hw/ppc/spapr_drc.h
> +++ b/include/hw/ppc/spapr_drc.h
> @@ -234,7 +234,7 @@ int spapr_drc_populate_dt(void *fdt, int fdt_offset, Object *owner,
>                            uint32_t drc_type_mask);
>  
>  void spapr_drc_attach(sPAPRDRConnector *drc, DeviceState *d, void *fdt,
> -                      int fdt_start_offset, bool coldplug, Error **errp);
> +                      int fdt_start_offset, Error **errp);
>  void spapr_drc_detach(sPAPRDRConnector *drc, DeviceState *d, Error **errp);
>  
>  #endif /* HW_SPAPR_DRC_H */
>