Re: [Qemu-devel] [PATCH v5 12/17] ppc/pnv: add a XICS native to each PowerNV chip

["Cédric Le Goater" <clg@kaod.org>]

On 10/22/2016 11:46 AM, Cédric Le Goater wrote:
> It also links the XICS object to each core as it is needed to do the
> CPU setup and the ICP MMIO windows are memory mapped for each thread.
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
> 
>  Changes since v4:
> 
>  - changed the calculation of the number of ICPs to use smp_threads
>  - added the mapping of the ICP subregions per thread
> 
>  hw/ppc/pnv.c         | 27 +++++++++++++++++++++++++++
>  hw/ppc/pnv_core.c    | 24 ++++++++++++++++++++----
>  include/hw/ppc/pnv.h |  2 ++
>  3 files changed, 49 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index c6dc7ca895b6..16d7baf0da71 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -33,6 +33,7 @@
>  #include "qemu/cutils.h"
>  #include "qapi/visitor.h"
>  
> +#include "hw/ppc/xics.h"
>  #include "hw/ppc/pnv_xscom.h"
>  
>  #include "hw/isa/isa.h"
> @@ -231,6 +232,9 @@ static void powernv_populate_chip(PnvChip *chip, void *fdt)
>          PnvCore *pnv_core = PNV_CORE(chip->cores + i * typesize);
>  
>          powernv_create_core_node(chip, pnv_core, fdt);
> +
> +        /* Interrupt presentation controllers (ICP). One per thread. */
> +        xics_native_populate_icp(chip, fdt, 0, pnv_core->pir, smp_threads);
>      }
>  
>      if (chip->ram_size) {
> @@ -637,6 +641,9 @@ static void pnv_chip_init(Object *obj)
>  
>      object_initialize(&chip->lpc, sizeof(chip->lpc), TYPE_PNV_LPC);
>      object_property_add_child(obj, "lpc", OBJECT(&chip->lpc), NULL);
> +
> +    object_initialize(&chip->xics, sizeof(chip->xics), TYPE_XICS_NATIVE);
> +    object_property_add_child(obj, "xics", OBJECT(&chip->xics), NULL);
>  }
>  
>  static void pnv_chip_realize(DeviceState *dev, Error **errp)
> @@ -668,12 +675,23 @@ static void pnv_chip_realize(DeviceState *dev, Error **errp)
>          return;
>      }
>  
> +    /*
> +     * Interrupt Controller. To be created before the cores because
> +     * each thread will fetch its ICP in the XICS
> +     */
> +    object_property_set_int(OBJECT(&chip->xics), chip->nr_cores * smp_threads,
> +                            "nr_servers",  &error_fatal);
> +    object_property_set_bool(OBJECT(&chip->xics), true, "realized",
> +                             &error_fatal);
> +    sysbus_mmio_map(SYS_BUS_DEVICE(&chip->xics), 0, PNV_XICS_BASE);
> +
>      chip->cores = g_malloc0(typesize * chip->nr_cores);
>  
>      for (i = 0, core_hwid = 0; (core_hwid < sizeof(chip->cores_mask) * 8)
>               && (i < chip->nr_cores); core_hwid++) {
>          char core_name[32];
>          void *pnv_core = chip->cores + i * typesize;
> +        int j;
>  
>          if (!(chip->cores_mask & (1ull << core_hwid))) {
>              continue;
> @@ -690,6 +708,8 @@ static void pnv_chip_realize(DeviceState *dev, Error **errp)
>          object_property_set_int(OBJECT(pnv_core),
>                                  pcc->core_pir(chip, core_hwid),
>                                  "pir", &error_fatal);
> +        object_property_add_const_link(OBJECT(pnv_core), "xics",
> +                                       OBJECT(&chip->xics), &error_fatal);
>          object_property_set_bool(OBJECT(pnv_core), true, "realized",
>                                   &error_fatal);
>          object_unref(OBJECT(pnv_core));
> @@ -697,6 +717,13 @@ static void pnv_chip_realize(DeviceState *dev, Error **errp)
>          /* Each core has an XSCOM MMIO region */
>          pnv_xscom_add_subregion(chip, PNV_XSCOM_EX_CORE_BASE(core_hwid),
>                                  &PNV_CORE(pnv_core)->xscom_regs);
> +
> +        /* Each thread as region for its ICP */
> +        for (j = 0; j < smp_threads; j++) {
> +            memory_region_add_subregion(&chip->xics.icp_mmio,
> +                                        pcc->core_pir(chip, core_hwid) << 12,

Pffut ... This should be :

                                          (pcc->core_pir(chip, core_hwid) + j) << 12,

but as smp_threads=1, it has no consequences for the moment. Tell me 
how you would prefer me to fix this.

Thanks,

C.


> +                                        &chip->xics.icp_mmios[i]);
> +        }
>          i++;
>      }
>      g_free(typename);
> diff --git a/hw/ppc/pnv_core.c b/hw/ppc/pnv_core.c
> index 2acda9637db5..e15c76163759 100644
> --- a/hw/ppc/pnv_core.c
> +++ b/hw/ppc/pnv_core.c
> @@ -24,6 +24,7 @@
>  #include "hw/ppc/ppc.h"
>  #include "hw/ppc/pnv.h"
>  #include "hw/ppc/pnv_core.h"
> +#include "hw/ppc/xics.h"
>  
>  static void powernv_cpu_reset(void *opaque)
>  {
> @@ -42,7 +43,7 @@ static void powernv_cpu_reset(void *opaque)
>      env->msr |= MSR_HVB; /* Hypervisor mode */
>  }
>  
> -static void powernv_cpu_init(PowerPCCPU *cpu, Error **errp)
> +static void powernv_cpu_init(PowerPCCPU *cpu, XICSState *xics, Error **errp)
>  {
>      CPUPPCState *env = &cpu->env;
>      int core_pir;
> @@ -62,6 +63,11 @@ static void powernv_cpu_init(PowerPCCPU *cpu, Error **errp)
>      cpu_ppc_tb_init(env, PNV_TIMEBASE_FREQ);
>  
>      qemu_register_reset(powernv_cpu_reset, cpu);
> +
> +    /*
> +     * xics_cpu_setup() assigns the CPU to the ICP in XICS
> +     */
> +    xics_cpu_setup(xics, cpu);
>  }
>  
>  /*
> @@ -109,7 +115,7 @@ static const MemoryRegionOps pnv_core_xscom_ops = {
>      .endianness = DEVICE_BIG_ENDIAN,
>  };
>  
> -static void pnv_core_realize_child(Object *child, Error **errp)
> +static void pnv_core_realize_child(Object *child, XICSState *xics, Error **errp)
>  {
>      Error *local_err = NULL;
>      CPUState *cs = CPU(child);
> @@ -121,7 +127,7 @@ static void pnv_core_realize_child(Object *child, Error **errp)
>          return;
>      }
>  
> -    powernv_cpu_init(cpu, &local_err);
> +    powernv_cpu_init(cpu, xics, &local_err);
>      if (local_err) {
>          error_propagate(errp, local_err);
>          return;
> @@ -139,6 +145,7 @@ static void pnv_core_realize(DeviceState *dev, Error **errp)
>      void *obj;
>      int i, j;
>      char name[32];
> +    XICSState *xics;
>  
>      pc->threads = g_malloc0(size * cc->nr_threads);
>      for (i = 0; i < cc->nr_threads; i++) {
> @@ -156,10 +163,19 @@ static void pnv_core_realize(DeviceState *dev, Error **errp)
>          object_unref(obj);
>      }
>  
> +    /* get XICS object from chip */
> +    obj = object_property_get_link(OBJECT(dev), "xics", &local_err);
> +    if (!obj) {
> +        error_setg(errp, "%s: required link 'xics' not found: %s",
> +                   __func__, error_get_pretty(local_err));
> +        return;
> +    }
> +    xics = XICS_COMMON(obj);
> +
>      for (j = 0; j < cc->nr_threads; j++) {
>          obj = pc->threads + j * size;
>  
> -        pnv_core_realize_child(obj, &local_err);
> +        pnv_core_realize_child(obj, xics, &local_err);
>          if (local_err) {
>              goto err;
>          }
> diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
> index c08ed1c72b17..e11618b05f1d 100644
> --- a/include/hw/ppc/pnv.h
> +++ b/include/hw/ppc/pnv.h
> @@ -23,6 +23,7 @@
>  #include "hw/sysbus.h"
>  #include "hw/ppc/pnv_xscom.h"
>  #include "hw/ppc/pnv_lpc.h"
> +#include "hw/ppc/xics.h"
>  
>  #define TYPE_PNV_CHIP "powernv-chip"
>  #define PNV_CHIP(obj) OBJECT_CHECK(PnvChip, (obj), TYPE_PNV_CHIP)
> @@ -57,6 +58,7 @@ typedef struct PnvChip {
>      AddressSpace xscom_as;
>  
>      PnvLpcController lpc;
> +    XICSNative   xics;
>  } PnvChip;
>  
>  typedef struct PnvChipClass {
>