Re: [Qemu-devel] [PATCH for-2.10 5/8] ppc/pnv: map the ICP memory regions

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

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On Wed, Mar 08, 2017 at 11:52:48AM +0100, Cédric Le Goater wrote:
> and populate the device tree accordingly for the guest to start using
> interrupts. This also links the ICP object to its associated CPUState
> (only used by KVM to control the kernel vCPU).
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>  hw/ppc/pnv.c      | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/ppc/pnv_core.c | 12 ++++++++----
>  2 files changed, 63 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index 7b13b08deadf..0ae11cc3a2ca 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -35,6 +35,7 @@
>  #include "monitor/monitor.h"
>  #include "hw/intc/intc.h"
>  
> +#include "hw/ppc/xics.h"
>  #include "hw/ppc/pnv_xscom.h"
>  
>  #include "hw/isa/isa.h"
> @@ -216,6 +217,47 @@ static void powernv_create_core_node(PnvChip *chip, PnvCore *pc, void *fdt)
>                         servers_prop, sizeof(servers_prop))));
>  }
>  
> +static void powernv_populate_icp(PnvChip *chip, void *fdt, int offset,
> +                          uint32_t pir, uint32_t count)
> +{
> +    uint64_t addr;
> +    char *name;
> +    const char compat[] = "IBM,power8-icp\0IBM,ppc-xicp";
> +    uint32_t irange[2], i, rsize;
> +    uint64_t *reg;
> +
> +    /*
> +     * TODO: add multichip ICP BAR
> +     */
> +    addr = PNV_ICP_BASE(chip) | (pir << 12);
> +
> +    irange[0] = cpu_to_be32(pir);
> +    irange[1] = cpu_to_be32(count);
> +
> +    rsize = sizeof(uint64_t) * 2 * count;
> +    reg = g_malloc(rsize);
> +    for (i = 0; i < count; i++) {
> +        reg[i * 2] = cpu_to_be64(addr | ((pir + i) * 0x1000));
> +        reg[i * 2 + 1] = cpu_to_be64(0x1000);
> +    }
> +
> +    name = g_strdup_printf("interrupt-controller@%"PRIX64, addr);
> +    offset = fdt_add_subnode(fdt, offset, name);
> +    _FDT(offset);
> +    g_free(name);
> +
> +    _FDT((fdt_setprop(fdt, offset, "compatible", compat, sizeof(compat))));
> +    _FDT((fdt_setprop(fdt, offset, "reg", reg, rsize)));
> +    _FDT((fdt_setprop_string(fdt, offset, "device_type",
> +                              "PowerPC-External-Interrupt-Presentation")));
> +    _FDT((fdt_setprop(fdt, offset, "interrupt-controller", NULL, 0)));
> +    _FDT((fdt_setprop(fdt, offset, "ibm,interrupt-server-ranges",
> +                       irange, sizeof(irange))));
> +    _FDT((fdt_setprop_cell(fdt, offset, "#interrupt-cells", 1)));
> +    _FDT((fdt_setprop_cell(fdt, offset, "#address-cells", 0)));
> +    g_free(reg);
> +}
> +
>  static void powernv_populate_chip(PnvChip *chip, void *fdt)
>  {
>      PnvChipClass *pcc = PNV_CHIP_GET_CLASS(chip);
> @@ -229,6 +271,10 @@ 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 Control Presenters (ICP). One per thread. */
> +        powernv_populate_icp(chip, fdt, 0, pnv_core->pir,

All the xicp nodes under the root bus, is that correct?

> +                             CPU_CORE(pnv_core)->nr_threads);
>      }
>  
>      if (chip->ram_size) {
> @@ -697,6 +743,7 @@ static void pnv_chip_realize(DeviceState *dev, Error **errp)
>          error_propagate(errp, error);
>          return;
>      }
> +    sysbus_mmio_map(SYS_BUS_DEVICE(chip), 1, PNV_ICP_BASE(chip));
>  
>      /* Cores */
>      pnv_chip_core_sanitize(chip, &error);
> @@ -711,6 +758,7 @@ static void pnv_chip_realize(DeviceState *dev, Error **errp)
>               && (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;
> @@ -738,6 +786,13 @@ static void pnv_chip_realize(DeviceState *dev, Error **errp)
>                                  PNV_XSCOM_EX_CORE_BASE(pcc->xscom_core_base,
>                                                         core_hwid),
>                                  &PNV_CORE(pnv_core)->xscom_regs);
> +
> +        /* Map the ICP registers for each thread */
> +        for (j = 0; j < CPU_CORE(pnv_core)->nr_threads; j++) {
> +            memory_region_add_subregion(&chip->icp_mmio,
> +                                 (pcc->core_pir(chip, core_hwid) + j) << 12,
> +                                  &PNV_CORE(pnv_core)->icp_mmios[j]);
> +        }
>          i++;
>      }
>      g_free(typename);
> diff --git a/hw/ppc/pnv_core.c b/hw/ppc/pnv_core.c
> index 8633afbff795..d28fa445b11b 100644
> --- a/hw/ppc/pnv_core.c
> +++ b/hw/ppc/pnv_core.c
> @@ -25,6 +25,7 @@
>  #include "hw/ppc/pnv.h"
>  #include "hw/ppc/pnv_core.h"
>  #include "hw/ppc/pnv_xscom.h"
> +#include "hw/ppc/xics.h"
>  
>  static uint64_t pnv_core_icp_read(void *opaque, hwaddr addr, unsigned width)
>  {
> @@ -165,7 +166,7 @@ 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, XICSFabric *xi, Error **errp)
>  {
>      CPUPPCState *env = &cpu->env;
>      int core_pir;
> @@ -185,6 +186,9 @@ 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 ICPState */
> +    xics_cpu_setup(xi, cpu);
>  }
>  
>  /*
> @@ -232,7 +236,7 @@ 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, XICSFabric *xi, Error **errp)
>  {
>      Error *local_err = NULL;
>      CPUState *cs = CPU(child);
> @@ -244,7 +248,7 @@ static void pnv_core_realize_child(Object *child, Error **errp)
>          return;
>      }
>  
> -    powernv_cpu_init(cpu, &local_err);
> +    powernv_cpu_init(cpu, xi, &local_err);
>      if (local_err) {
>          error_propagate(errp, local_err);
>          return;
> @@ -298,7 +302,7 @@ static void pnv_core_realize(DeviceState *dev, Error **errp)
>      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_FABRIC(xi), &local_err);
>          if (local_err) {
>              goto 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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