Re: [Qemu-devel] [PATCH 20/25] spapr: add device tree support for the XIVE interrupt mode

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

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On Thu, Nov 23, 2017 at 02:29:50PM +0100, Cédric Le Goater wrote:
> The XIVE interface for the guest is described in the device tree under
> the "interrupt-controller" node. A couple of new properties are
> specific to XIVE :
> 
>  - "reg"
> 
>    contains the base address and size of the thread interrupt
>    managnement areas (TIMA), also called rings, for the User level and
>    for the Guest OS level. Only the Guest OS level is taken into
>    account today.
> 
>  - "ibm,xive-eq-sizes"
> 
>    the size of the event queues. One cell per size supported, contains
>    log2 of size, in ascending order.
> 
>  - "ibm,xive-lisn-ranges"
> 
>    the interrupt numbers ranges assigned to the guest. These are
>    allocated using a simple bitmap.
> 
> and also under the root node :
> 
>  - "ibm,plat-res-int-priorities"
> 
>    contains a list of priorities that the hypervisor has reserved for
>    its own use. Simulate ranges as defined by the PowerVM Hypervisor.
> 
> When the XIVE interrupt mode is activated after the CAS negotiation,
> the machine will perform a reboot to rebuild the device tree.
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>  hw/intc/spapr_xive_hcall.c  | 50 +++++++++++++++++++++++++++++++++++++++++++++
>  hw/ppc/spapr.c              |  7 ++++++-
>  hw/ppc/spapr_hcall.c        |  6 ++++++
>  include/hw/ppc/spapr_xive.h |  2 ++
>  4 files changed, 64 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/intc/spapr_xive_hcall.c b/hw/intc/spapr_xive_hcall.c
> index 676fe0e2d5c7..60c6c9f4be8f 100644
> --- a/hw/intc/spapr_xive_hcall.c
> +++ b/hw/intc/spapr_xive_hcall.c
> @@ -883,3 +883,53 @@ void spapr_xive_hcall_init(sPAPRMachineState *spapr)
>      spapr_register_hypercall(H_INT_SYNC, h_int_sync);
>      spapr_register_hypercall(H_INT_RESET, h_int_reset);
>  }
> +
> +void spapr_xive_populate(sPAPRMachineState *spapr, int nr_servers,
> +                         void *fdt, uint32_t phandle)

Call it spapr_dt_xive() please, I'm trying to standardize on that
pattern for functions creating DT pieces.

> +{
> +    sPAPRXive *xive = spapr->xive;
> +    int node;
> +    uint64_t timas[2 * 2];
> +    uint32_t lisn_ranges[] = {
> +        cpu_to_be32(0),
> +        cpu_to_be32(nr_servers),
> +    };
> +    uint32_t eq_sizes[] = {
> +        cpu_to_be32(12), /* 4K */
> +        cpu_to_be32(16), /* 64K */
> +        cpu_to_be32(21), /* 2M */
> +        cpu_to_be32(24), /* 16M */
> +    };
> +    uint32_t plat_res_int_priorities[ARRAY_SIZE(reserved_priorities)];
> +    int i;
> +
> +    for (i = 0; i < ARRAY_SIZE(plat_res_int_priorities); i++) {
> +        plat_res_int_priorities[i] = cpu_to_be32(reserved_priorities[i]);
> +    }
> +
> +    /* Thread Interrupt Management Areas : User and OS */
> +    for (i = 0; i < 2; i++) {
> +        timas[i * 2] = cpu_to_be64(xive->tm_base + i * (1 << xive->tm_shift));
> +        timas[i * 2 + 1] = cpu_to_be64(1 << xive->tm_shift);
> +    }
> +
> +    _FDT(node = fdt_add_subnode(fdt, 0, "interrupt-controller"));

You need a unit address here matching the reg property.

> +
> +    _FDT(fdt_setprop_string(fdt, node, "name", "interrupt-controller"));

You don't need to set name properties explicitly for flattened trees.

> +    _FDT(fdt_setprop_string(fdt, node, "device_type", "power-ivpe"));
> +    _FDT(fdt_setprop(fdt, node, "reg", timas, sizeof(timas)));
> +
> +    _FDT(fdt_setprop_string(fdt, node, "compatible", "ibm,power-ivpe"));
> +    _FDT(fdt_setprop(fdt, node, "ibm,xive-eq-sizes", eq_sizes,
> +                     sizeof(eq_sizes)));
> +    _FDT(fdt_setprop(fdt, node, "ibm,xive-lisn-ranges", lisn_ranges,
> +                     sizeof(lisn_ranges)));
> +
> +    /* For SLOF */
> +    _FDT(fdt_setprop_cell(fdt, node, "linux,phandle", phandle));
> +    _FDT(fdt_setprop_cell(fdt, node, "phandle", phandle));
> +
> +    /* top properties */
> +    _FDT(fdt_setprop(fdt, 0, "ibm,plat-res-int-priorities",
> +                     plat_res_int_priorities, sizeof(plat_res_int_priorities)));
> +}
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 8b15c0b500d0..3a62369883cc 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -1127,7 +1127,12 @@ static void *spapr_build_fdt(sPAPRMachineState *spapr,
>      _FDT(fdt_setprop_cell(fdt, 0, "#size-cells", 2));
>  
>      /* /interrupt controller */
> -    spapr_dt_xics(xics_max_server_number(), fdt, PHANDLE_XICP);
> +    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
> +        spapr_dt_xics(xics_max_server_number(), fdt, PHANDLE_XICP);
> +    } else {
> +        /* Populate device tree for XIVE */
> +        spapr_xive_populate(spapr, xics_max_server_number(), fdt, PHANDLE_XICP);
> +    }
>  
>      ret = spapr_populate_memory(spapr, fdt);
>      if (ret < 0) {
> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> index be22a6b2895f..e2a1665beee9 100644
> --- a/hw/ppc/spapr_hcall.c
> +++ b/hw/ppc/spapr_hcall.c
> @@ -1646,6 +1646,12 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
>              (spapr_h_cas_compose_response(spapr, args[1], args[2],
>                                            ov5_updates) != 0);
>      }
> +
> +    /* We need to rebuild the device tree for XIVE, generate a reset */
> +    if (!spapr->cas_reboot) {
> +        spapr->cas_reboot = spapr_ovec_test(ov5_updates, OV5_XIVE_EXPLOIT);
> +    }
> +
>      spapr_ovec_cleanup(ov5_updates);
>  
>      if (spapr->cas_reboot) {
> diff --git a/include/hw/ppc/spapr_xive.h b/include/hw/ppc/spapr_xive.h
> index 3f822220647f..f6d4bf26e06a 100644
> --- a/include/hw/ppc/spapr_xive.h
> +++ b/include/hw/ppc/spapr_xive.h
> @@ -82,5 +82,7 @@ void spapr_xive_icp_pic_print_info(sPAPRXiveICP *xicp, Monitor *mon);
>  typedef struct sPAPRMachineState sPAPRMachineState;
>  
>  void spapr_xive_hcall_init(sPAPRMachineState *spapr);
> +void spapr_xive_populate(sPAPRMachineState *spapr, int nr_servers, void *fdt,
> +                         uint32_t phandle);
>  
>  #endif /* PPC_SPAPR_XIVE_H */

-- 
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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