Re: [Qemu-devel] [PATCH v2 1/2] spapr: introduce a spapr_irq class 'nr_msis' attribute

[David Gibson <david@gibson.dropbear.id.au>]

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On Tue, Sep 11, 2018 at 07:55:02AM +0200, Cédric Le Goater wrote:
> The number of MSI interrupts a sPAPR machine can allocate is in direct
> relation with the number of interrupts of the sPAPRIrq backend. Define
> statically this value at the sPAPRIrq class level and use it for the
> "ibm,pe-total-#msi" property of the sPAPR PHB.
> 
> According to the PAPR specs, "ibm,pe-total-#msi" defines the maximum
> number of MSIs that are available to the PE. We choose to advertise
> the maximum number of MSIs that are available to the machine for
> simplicity of the model and to avoid segmenting the MSI interrupt pool
> which can be easily shared. If the pool limit is reached, it can be
> extended dynamically.
> 
> Finally, remove XICS_IRQS_SPAPR which is now unused.
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>

Applied to ppc-for-3.1, thanks.

> ---
>  include/hw/ppc/spapr_irq.h | 1 +
>  include/hw/ppc/xics.h      | 2 --
>  hw/ppc/spapr_irq.c         | 9 +++++++--
>  hw/ppc/spapr_pci.c         | 5 +++--
>  4 files changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/include/hw/ppc/spapr_irq.h b/include/hw/ppc/spapr_irq.h
> index 0e98c4474bb2..650f810ad2aa 100644
> --- a/include/hw/ppc/spapr_irq.h
> +++ b/include/hw/ppc/spapr_irq.h
> @@ -31,6 +31,7 @@ void spapr_irq_msi_reset(sPAPRMachineState *spapr);
>  
>  typedef struct sPAPRIrq {
>      uint32_t    nr_irqs;
> +    uint32_t    nr_msis;
>  
>      void (*init)(sPAPRMachineState *spapr, Error **errp);
>      int (*claim)(sPAPRMachineState *spapr, int irq, bool lsi, Error **errp);
> diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
> index 9c2916c9b23a..9958443d1984 100644
> --- a/include/hw/ppc/xics.h
> +++ b/include/hw/ppc/xics.h
> @@ -181,8 +181,6 @@ typedef struct XICSFabricClass {
>      ICPState *(*icp_get)(XICSFabric *xi, int server);
>  } XICSFabricClass;
>  
> -#define XICS_IRQS_SPAPR               1024
> -
>  void spapr_dt_xics(int nr_servers, void *fdt, uint32_t phandle);
>  
>  ICPState *xics_icp_get(XICSFabric *xi, int server);
> diff --git a/hw/ppc/spapr_irq.c b/hw/ppc/spapr_irq.c
> index 0cbb5dd39368..fe8be5f5217a 100644
> --- a/hw/ppc/spapr_irq.c
> +++ b/hw/ppc/spapr_irq.c
> @@ -99,7 +99,7 @@ static void spapr_irq_init_xics(sPAPRMachineState *spapr, Error **errp)
>  
>      /* Initialize the MSI IRQ allocator. */
>      if (!SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) {
> -        spapr_irq_msi_init(spapr, XICS_IRQ_BASE + nr_irqs - SPAPR_IRQ_MSI);
> +        spapr_irq_msi_init(spapr, smc->irq->nr_msis);
>      }
>  
>      if (kvm_enabled()) {
> @@ -195,8 +195,13 @@ static void spapr_irq_print_info_xics(sPAPRMachineState *spapr, Monitor *mon)
>      ics_pic_print_info(spapr->ics, mon);
>  }
>  
> +#define SPAPR_IRQ_XICS_NR_IRQS     0x400
> +#define SPAPR_IRQ_XICS_NR_MSIS     \
> +    (XICS_IRQ_BASE + SPAPR_IRQ_XICS_NR_IRQS - SPAPR_IRQ_MSI)
> +
>  sPAPRIrq spapr_irq_xics = {
> -    .nr_irqs     = XICS_IRQS_SPAPR,
> +    .nr_irqs     = SPAPR_IRQ_XICS_NR_IRQS,
> +    .nr_msis     = SPAPR_IRQ_XICS_NR_MSIS,
>  
>      .init        = spapr_irq_init_xics,
>      .claim       = spapr_irq_claim_xics,
> diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
> index 6bcb4f419b6b..bb736177e76c 100644
> --- a/hw/ppc/spapr_pci.c
> +++ b/hw/ppc/spapr_pci.c
> @@ -2121,6 +2121,7 @@ int spapr_populate_pci_dt(sPAPRPHBState *phb,
>      sPAPRTCETable *tcet;
>      PCIBus *bus = PCI_HOST_BRIDGE(phb)->bus;
>      sPAPRFDT s_fdt;
> +    sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(qdev_get_machine());
>  
>      /* Start populating the FDT */
>      nodename = g_strdup_printf("pci@%" PRIx64, phb->buid);
> @@ -2138,8 +2139,8 @@ int spapr_populate_pci_dt(sPAPRPHBState *phb,
>      _FDT(fdt_setprop(fdt, bus_off, "ranges", &ranges, sizeof_ranges));
>      _FDT(fdt_setprop(fdt, bus_off, "reg", &bus_reg, sizeof(bus_reg)));
>      _FDT(fdt_setprop_cell(fdt, bus_off, "ibm,pci-config-space-type", 0x1));
> -    /* TODO: fine tune the total count of allocatable MSIs per PHB */
> -    _FDT(fdt_setprop_cell(fdt, bus_off, "ibm,pe-total-#msi", XICS_IRQS_SPAPR));
> +    _FDT(fdt_setprop_cell(fdt, bus_off, "ibm,pe-total-#msi",
> +                          smc->irq->nr_msis));
>  
>      /* Dynamic DMA window */
>      if (phb->ddw_enabled) {

-- 
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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