Re: [Qemu-devel] [PATCH 3/3] spapr_pci: fix "ibm, pe-total-#msi" value

From: "Cédric Le Goater" <clg@kaod.org>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: qemu-ppc@nongnu.org, qemu-devel@nongnu.org, Greg Kurz <groug@kaod.org>
Subject: Re: [Qemu-devel] [PATCH 3/3] spapr_pci: fix "ibm, pe-total-#msi" value
Date: Tue, 11 Sep 2018 06:42:18 +0200	[thread overview]
Message-ID: <86b41d62-73b1-f181-ceeb-ad0396fc1c11@kaod.org> (raw)
In-Reply-To: <20180911015032.GG7978@umbus.fritz.box>

On 09/11/2018 03:50 AM, David Gibson wrote:
> On Mon, Sep 10, 2018 at 01:02:22PM +0200, Cédric Le Goater wrote:
>> The "ibm,pe-total-#msi" property of the sPAPR PHB defines the number
>> of allocatable MSI interrupts. This is currently set to XICS_IRQS_SPAPR
>> which covers the full IRQ number space of the machine. This is wrong.
>>
>> Fix the definition by using the 'nr_msis' attribute of the sPAPRIrq
>> class and remove XICS_IRQS_SPAPR which is now unused.
>>
>> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> 
> Oh.. right.. I think it makes more sense to just merge this into the
> first patch.

OK. I will also remove XICS_IRQS_SPAPR in the first patch then

Thanks,

C.

>> ---
>>  include/hw/ppc/xics.h | 2 --
>>  hw/ppc/spapr_irq.c    | 2 +-
>>  hw/ppc/spapr_pci.c    | 5 +++--
>>  3 files changed, 4 insertions(+), 5 deletions(-)
>>
>> 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 b14d7bce00ea..e77b94cc685e 100644
>> --- a/hw/ppc/spapr_irq.c
>> +++ b/hw/ppc/spapr_irq.c
>> @@ -290,7 +290,7 @@ int spapr_irq_find(sPAPRMachineState *spapr, int num, bool align, Error **errp)
>>      return first + ics->offset;
>>  }
>>  
>> -#define SPAPR_IRQ_XICS_LEGACY_NR_IRQS     XICS_IRQS_SPAPR
>> +#define SPAPR_IRQ_XICS_LEGACY_NR_IRQS     0x400
>>  
>>  sPAPRIrq spapr_irq_xics_legacy = {
>>      .nr_irqs     = SPAPR_IRQ_XICS_LEGACY_NR_IRQS,
>> 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) {
> 