Re: [Qemu-devel] [PATCH] sPAPR: implement route_intx_to_irq to get gsi of pci device.

[liu ping fan <qemulist@gmail.com>]

On Mon, Sep 23, 2013 at 9:59 AM, Alexey Kardashevskiy <aik@ozlabs.ru> wrote:
> On 09/22/2013 09:47 PM, Liu Ping Fan wrote:
>> This is useful when pci assignment happens on sPAPR.
>
>
> I have almost the same patch in my queue already, it will enable irqfd for
> both INTX and MSI, I am just waiting till in-kernel XICS patchset gets in
> upstream and then I'll post it.
>
Ok,
>
>> Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
>> ---
>> This patch will apply on patches which enable xics in kernel.
>> ---
>>  hw/intc/xics.c        |  5 +++++
>>  hw/ppc/spapr_pci.c    | 14 ++++++++++++++
>>  include/hw/ppc/xics.h |  1 +
>>  3 files changed, 20 insertions(+)
>>
>> diff --git a/hw/intc/xics.c b/hw/intc/xics.c
>> index bb018d1..02cdab8 100644
>> --- a/hw/intc/xics.c
>> +++ b/hw/intc/xics.c
>> @@ -442,6 +442,11 @@ void xics_set_irq_type(XICSState *icp, int irq, bool lsi)
>>      icp->ics->islsi[irq - icp->ics->offset] = lsi;
>>  }
>>
>> +int xics_get_irq_offset(XICSState *icp)
>> +{
>> +    return icp->ics->offset;
>> +}
>> +
>>  /*
>>   * Guest interfaces
>>   */
>> diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
>> index 9b6ee32..6d3657a 100644
>> --- a/hw/ppc/spapr_pci.c
>> +++ b/hw/ppc/spapr_pci.c
>> @@ -432,6 +432,19 @@ static void pci_spapr_set_irq(void *opaque, int irq_num, int level)
>>      qemu_set_irq(spapr_phb_lsi_qirq(phb, irq_num), level);
>>  }
>>
>> +static PCIINTxRoute spapr_phb_route_intx_to_irq(void *opaque, int pirq_pin)
>> +{
>> +    int gsi;
>> +    PCIINTxRoute route;
>> +    sPAPRPHBState *phb = opaque;
>> +
>> +    gsi = phb->lsi_table[pirq_pin].irq;
>> +    gsi += xics_get_irq_offset(spapr->icp);
>
>
> Why do you need this? lsi_table[].irq is received from spapr_allocate_lsi()
> which already adds this offset.
>
Oh, you are right, next_irq begin at XICS_IRQ_BASE

Thx,
Pingfan
>
>
>> +    route.mode = PCI_INTX_ENABLED;
>> +    route.irq = gsi;
>> +    return route;
>> +}
>> +
>>  /*
>>   * MSI/MSIX memory region implementation.
>>   * The handler handles both MSI and MSIX.
>> @@ -595,6 +608,7 @@ static int spapr_phb_init(SysBusDevice *s)
>>                             pci_spapr_set_irq, pci_spapr_map_irq, sphb,
>>                             &sphb->memspace, &sphb->iospace,
>>                             PCI_DEVFN(0, 0), PCI_NUM_PINS, TYPE_PCI_BUS);
>> +    pci_bus_set_route_irq_fn(bus, spapr_phb_route_intx_to_irq);
>>      phb->bus = bus;
>>
>>      sphb->dma_window_start = 0;
>> diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
>> index 66364c5..6ed1f4d 100644
>> --- a/include/hw/ppc/xics.h
>> +++ b/include/hw/ppc/xics.h
>> @@ -97,6 +97,7 @@ struct ICSIRQState {
>>
>>  qemu_irq xics_get_qirq(XICSState *icp, int irq);
>>  void xics_set_irq_type(XICSState *icp, int irq, bool lsi);
>> +int xics_get_irq_offset(XICSState *icp);
>>
>>  void xics_cpu_setup(XICSState *icp, PowerPCCPU *cpu);
>>
>>
>
>
> --
> Alexey