Re: [Qemu-ppc] [PATCH] spapr_pci: factorize the use of SPAPR_MACHINE_GET_CLASS()

[David Gibson]

On Fri, Aug 10, 2018 at 10:00:26AM +0200, Cédric Le Goater wrote:
> It should save us some CPU cycles as these routines perform a lot of
> checks.

I don't think any of these is particularly fastpath, but sure, applied
to ppc-for-3.1.

> 
> Signed-off-by: Cédric Le Goater <address@hidden>
> ---
>  hw/ppc/spapr_pci.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
> index 3791ced6c536..5cd676e4430d 100644
> --- a/hw/ppc/spapr_pci.c
> +++ b/hw/ppc/spapr_pci.c
> @@ -267,6 +267,7 @@ static void rtas_ibm_change_msi(PowerPCCPU *cpu, 
> sPAPRMachineState *spapr,
>                                  target_ulong args, uint32_t nret,
>                                  target_ulong rets)
>  {
> +    sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr);
>      uint32_t config_addr = rtas_ld(args, 0);
>      uint64_t buid = rtas_ldq(args, 1);
>      unsigned int func = rtas_ld(args, 3);
> @@ -334,7 +335,7 @@ static void rtas_ibm_change_msi(PowerPCCPU *cpu, 
> sPAPRMachineState *spapr,
>              return;
>          }
>  
> -        if (!SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) {
> +        if (!smc->legacy_irq_allocation) {
>              spapr_irq_msi_free(spapr, msi->first_irq, msi->num);
>          }
>          spapr_irq_free(spapr, msi->first_irq, msi->num);
> @@ -375,7 +376,7 @@ static void rtas_ibm_change_msi(PowerPCCPU *cpu, 
> sPAPRMachineState *spapr,
>      }
>  
>      /* Allocate MSIs */
> -    if (SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) {
> +    if (smc->legacy_irq_allocation) {
>          irq = spapr_irq_find(spapr, req_num, ret_intr_type == RTAS_TYPE_MSI,
>                               &err);
>      } else {
> @@ -401,7 +402,7 @@ static void rtas_ibm_change_msi(PowerPCCPU *cpu, 
> sPAPRMachineState *spapr,
>  
>      /* Release previous MSIs */
>      if (msi) {
> -        if (!SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) {
> +        if (!smc->legacy_irq_allocation) {
>              spapr_irq_msi_free(spapr, msi->first_irq, msi->num);
>          }
>          spapr_irq_free(spapr, msi->first_irq, msi->num);
> @@ -1558,6 +1559,7 @@ static void spapr_phb_realize(DeviceState *dev, Error 
> **errp)
>      sPAPRMachineState *spapr =
>          (sPAPRMachineState *) object_dynamic_cast(qdev_get_machine(),
>                                                    TYPE_SPAPR_MACHINE);
> +    sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr);
>      SysBusDevice *s = SYS_BUS_DEVICE(dev);
>      sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(s);
>      PCIHostState *phb = PCI_HOST_BRIDGE(s);
> @@ -1575,7 +1577,6 @@ static void spapr_phb_realize(DeviceState *dev, Error 
> **errp)
>      }
>  
>      if (sphb->index != (uint32_t)-1) {
> -        sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr);
>          Error *local_err = NULL;
>  
>          smc->phb_placement(spapr, sphb->index,
> @@ -1720,7 +1721,7 @@ static void spapr_phb_realize(DeviceState *dev, Error 
> **errp)
>          uint32_t irq = SPAPR_IRQ_PCI_LSI + sphb->index * PCI_NUM_PINS + i;
>          Error *local_err = NULL;
>  
> -        if (SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) {
> +        if (smc->legacy_irq_allocation) {
>              irq = spapr_irq_findone(spapr, &local_err);
>              if (local_err) {
>                  error_propagate(errp, local_err);

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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