Re: [Qemu-ppc] [PATCH v4 01/20] ppc/pnv: add skeleton PowerNV platform

[David Gibson]

On Mon, Oct 03, 2016 at 09:24:37AM +0200, Cédric Le Goater wrote:
> From: Benjamin Herrenschmidt <address@hidden>
> 
> The goal is to emulate a PowerNV system at the level of the skiboot
> firmware, which loads the OS and provides some runtime services. Power
> Systems have a lower firmware (HostBoot) that does low level system
> initialization, like DRAM training. This is beyond the scope of what
> qemu will address in a PowerNV guest.
> 
> No devices yet, not even an interrupt controller. Just to get started,
> some RAM to load the skiboot firmware, the kernel and initrd. The
> device tree is fully created in the machine reset op.
> 
> Signed-off-by: Benjamin Herrenschmidt <address@hidden>
> [clg: - updated for qemu-2.7
>       - replaced fprintf by error_report
>       - used a common definition of _FDT macro
>       - removed VMStateDescription as migration is not yet supported
>       - added IBM Copyright statements
>       - reworked kernel_filename handling
>       - merged PnvSystem and sPowerNVMachineState
>       - removed PHANDLE_XICP
>       - added ppc_create_page_sizes_prop helper
>       - removed nmi support
>       - removed kvm support
>       - updated powernv machine to version 2.8
>       - removed chips and cpus, They will be provided in another patches
>       - added a machine reset routine to initialize the device tree (also)
>       - french has a squelette and english a skeleton.
>       - improved commit log.
>       - reworked prototypes parameters
>       - added a check on the ram size (thanks to Michael Ellerman)
>       - fixed chip-id cell
>       - changed MAX_CPUS to 2048
>       - simplified memory node creation to one node only
>       - removed machine version
>       - rewrote the device tree creation with the fdt "rw" routines
>       - s/sPowerNVMachineState/PnvMachineState/
>       - etc.]
> Signed-off-by: Cédric Le Goater <address@hidden>
> ---
>  Changes since v3:
> 
>  - fixed printf format for hwaddr
>  - used fdt_pack() before writing the tree in memory 
>  - removed the requirement on having a kernel loaded as running with
>    just a firmware is fine. We will need to discuss the inclusion of
>    the file skiboot.lid under qemu.

Yes, this isn't terribly useful without it.  The normal procedure for
new roms is this:

   1. Get the upstream git tree for the ROM mirrored to qemu.org
   2. Add a git submodule under roms/ referencing the git mirror on
      qemu.org
   3. Add a pre-built ROM binary to pc-bios/
   4. Add a brief description of the ROM, including upstream git URL
      to pc-bios/README

Steps 2, 3 & 4 can (and usually should) be a single commit.

This code is looking close enough, that having a usable rom image is
probably the last thing stopping merge, at least of these initial
patches.

Probably best to get underway with the rom inclusion ASAP.

>  Changes since v2:
> 
>  - some more copyright header cleanups
>  - remove fdt_addr field from PnvMachineState
> 
>  Changes since v1:
> 
>  - changed MAX_CPUS to 2048
>  - simplified memory node creation to one node only
>  - removed machine version 
>  - rewrote the device tree creation with the fdt "rw" routines
>  - s/sPowerNVMachineState/PnvMachineState/
>  - block_default_type is back to IF_IDE because of the AHCI device
> 
>  default-configs/ppc64-softmmu.mak |   1 +
>  hw/ppc/Makefile.objs              |   2 +
>  hw/ppc/pnv.c                      | 223 
> ++++++++++++++++++++++++++++++++++++++
>  include/hw/ppc/pnv.h              |  38 +++++++
>  4 files changed, 264 insertions(+)
>  create mode 100644 hw/ppc/pnv.c
>  create mode 100644 include/hw/ppc/pnv.h
> 
> diff --git a/default-configs/ppc64-softmmu.mak 
> b/default-configs/ppc64-softmmu.mak
> index db5a4d6f5eea..67a9bcaa67fa 100644
> --- a/default-configs/ppc64-softmmu.mak
> +++ b/default-configs/ppc64-softmmu.mak
> @@ -39,6 +39,7 @@ CONFIG_I8259=y
>  CONFIG_XILINX=y
>  CONFIG_XILINX_ETHLITE=y
>  CONFIG_PSERIES=y
> +CONFIG_POWERNV=y
>  CONFIG_PREP=y
>  CONFIG_MAC=y
>  CONFIG_E500=y
> diff --git a/hw/ppc/Makefile.objs b/hw/ppc/Makefile.objs
> index 99a0d4e581bf..8105db7d5600 100644
> --- a/hw/ppc/Makefile.objs
> +++ b/hw/ppc/Makefile.objs
> @@ -5,6 +5,8 @@ obj-$(CONFIG_PSERIES) += spapr.o spapr_vio.o spapr_events.o
>  obj-$(CONFIG_PSERIES) += spapr_hcall.o spapr_iommu.o spapr_rtas.o
>  obj-$(CONFIG_PSERIES) += spapr_pci.o spapr_rtc.o spapr_drc.o spapr_rng.o
>  obj-$(CONFIG_PSERIES) += spapr_cpu_core.o
> +# IBM PowerNV
> +obj-$(CONFIG_POWERNV) += pnv.o
>  ifeq ($(CONFIG_PCI)$(CONFIG_PSERIES)$(CONFIG_LINUX), yyy)
>  obj-y += spapr_pci_vfio.o
>  endif
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> new file mode 100644
> index 000000000000..02fc4826baa4
> --- /dev/null
> +++ b/hw/ppc/pnv.c
> @@ -0,0 +1,223 @@
> +/*
> + * QEMU PowerPC PowerNV machine model
> + *
> + * Copyright (c) 2016, IBM Corporation.
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, see 
> <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qapi/error.h"
> +#include "sysemu/sysemu.h"
> +#include "sysemu/numa.h"
> +#include "hw/hw.h"
> +#include "target-ppc/cpu.h"
> +#include "qemu/log.h"
> +#include "hw/ppc/fdt.h"
> +#include "hw/ppc/ppc.h"
> +#include "hw/ppc/pnv.h"
> +#include "hw/loader.h"
> +#include "exec/address-spaces.h"
> +#include "qemu/cutils.h"
> +
> +#include <libfdt.h>
> +
> +#define FDT_MAX_SIZE            0x00100000
> +
> +#define FW_FILE_NAME            "skiboot.lid"
> +#define FW_LOAD_ADDR            0x0
> +#define FW_MAX_SIZE             0x00400000
> +
> +#define KERNEL_LOAD_ADDR        0x20000000
> +#define INITRD_LOAD_ADDR        0x40000000
> +
> +/*
> + * On Power Systems E880, the max cpus (threads) should be :
> + *     4 * 4 sockets * 12 cores * 8 threads = 1536
> + * Let's make it 2^11
> + */
> +#define MAX_CPUS                2048
> +
> +/*
> + * Memory nodes are created by hostboot, one for each range of memory
> + * that has a different "affinity". In practice, it means one range
> + * per chip.
> + */
> +static void powernv_populate_memory_node(void *fdt, int chip_id, hwaddr 
> start,
> +                                         hwaddr size)
> +{
> +    char *mem_name;
> +    uint64_t mem_reg_property[2];
> +    int off;
> +
> +    mem_reg_property[0] = cpu_to_be64(start);
> +    mem_reg_property[1] = cpu_to_be64(size);
> +
> +    mem_name = g_strdup_printf("address@hidden"HWADDR_PRIx, start);
> +    off = fdt_add_subnode(fdt, 0, mem_name);
> +    g_free(mem_name);
> +
> +    _FDT((fdt_setprop_string(fdt, off, "device_type", "memory")));
> +    _FDT((fdt_setprop(fdt, off, "reg", mem_reg_property,
> +                       sizeof(mem_reg_property))));
> +    _FDT((fdt_setprop_cell(fdt, off, "ibm,chip-id", chip_id)));
> +}
> +
> +static void *powernv_create_fdt(PnvMachineState *pnv,
> +                                const char *kernel_cmdline)
> +{
> +    void *fdt;
> +    char *buf;
> +    const char plat_compat[] = "qemu,powernv\0ibm,powernv";
> +    int off;
> +
> +    fdt = g_malloc0(FDT_MAX_SIZE);
> +    _FDT((fdt_create_empty_tree(fdt, FDT_MAX_SIZE)));
> +
> +    /* Root node */
> +    _FDT((fdt_setprop_cell(fdt, 0, "#address-cells", 0x2)));
> +    _FDT((fdt_setprop_cell(fdt, 0, "#size-cells", 0x2)));
> +    _FDT((fdt_setprop_string(fdt, 0, "model",
> +                             "IBM PowerNV (emulated by qemu)")));
> +    _FDT((fdt_setprop(fdt, 0, "compatible", plat_compat,
> +                      sizeof(plat_compat))));
> +
> +    buf =  qemu_uuid_unparse_strdup(&qemu_uuid);
> +    _FDT((fdt_setprop_string(fdt, 0, "vm,uuid", buf)));
> +    if (qemu_uuid_set) {
> +        _FDT((fdt_property_string(fdt, "system-id", buf)));
> +    }
> +    g_free(buf);
> +
> +    off = fdt_add_subnode(fdt, 0, "chosen");
> +    if (kernel_cmdline) {
> +        _FDT((fdt_setprop_string(fdt, off, "bootargs", kernel_cmdline)));
> +    }
> +
> +    if (pnv->initrd_size) {
> +        uint32_t start_prop = cpu_to_be32(pnv->initrd_base);
> +        uint32_t end_prop = cpu_to_be32(pnv->initrd_base + pnv->initrd_size);
> +
> +        _FDT((fdt_setprop(fdt, off, "linux,initrd-start",
> +                               &start_prop, sizeof(start_prop))));
> +        _FDT((fdt_setprop(fdt, off, "linux,initrd-end",
> +                               &end_prop, sizeof(end_prop))));
> +    }
> +
> +    /* Put all the memory in one node on chip 0 until we find a way to
> +     * specify different ranges for each chip
> +     */
> +    powernv_populate_memory_node(fdt, 0, 0, ram_size);

machine->ram_size is preferred over the ram_size global these days.
Doesn't matter that much, since this will be reworked for multiple
chips at some point anyway.

> +
> +    return fdt;
> +}
> +
> +static void ppc_powernv_reset(void)
> +{
> +    MachineState *machine = MACHINE(qdev_get_machine());
> +    PnvMachineState *pnv = POWERNV_MACHINE(machine);
> +    void *fdt;
> +
> +    qemu_devices_reset();
> +
> +    fdt = powernv_create_fdt(pnv, machine->kernel_cmdline);
> +
> +    /* Pack resulting tree */
> +    _FDT((fdt_pack(fdt)));
> +
> +    cpu_physical_memory_write(POWERNV_FDT_ADDR, fdt, fdt_totalsize(fdt));
> +}
> +
> +static void ppc_powernv_init(MachineState *machine)
> +{
> +    PnvMachineState *pnv = POWERNV_MACHINE(machine);
> +    ram_addr_t ram_size = machine->ram_size;
> +    MemoryRegion *ram;
> +    char *fw_filename;
> +    long fw_size;
> +    long kernel_size;
> +
> +    /* allocate RAM */
> +    if (ram_size < (1 * G_BYTE)) {
> +        error_report("Warning: skiboot may not work with < 1GB of RAM");
> +    }
> +
> +    ram = g_new(MemoryRegion, 1);
> +    memory_region_allocate_system_memory(ram, NULL, "ppc_powernv.ram",
> +                                         ram_size);
> +    memory_region_add_subregion(get_system_memory(), 0, ram);
> +
> +    /* load skiboot firmware  */
> +    if (bios_name == NULL) {
> +        bios_name = FW_FILE_NAME;
> +    }
> +
> +    fw_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
> +
> +    fw_size = load_image_targphys(fw_filename, FW_LOAD_ADDR, FW_MAX_SIZE);
> +    if (fw_size < 0) {
> +        hw_error("qemu: could not load OPAL '%s'\n", fw_filename);
> +        exit(1);
> +    }
> +    g_free(fw_filename);
> +
> +    /* load kernel */
> +    kernel_size = load_image_targphys(machine->kernel_filename,
> +                                      KERNEL_LOAD_ADDR, 0x2000000);
> +    if (kernel_size < 0) {
> +        hw_error("qemu: could not load kernel'%s'\n", 
> machine->kernel_filename);
> +        exit(1);
> +    }
> +
> +    /* load initrd */
> +    if (machine->initrd_filename) {
> +        pnv->initrd_base = INITRD_LOAD_ADDR;
> +        pnv->initrd_size = load_image_targphys(machine->initrd_filename,
> +                                  pnv->initrd_base, 0x10000000); /* 128MB 
> max */
> +        if (pnv->initrd_size < 0) {
> +            error_report("qemu: could not load initial ram disk '%s'",
> +                         machine->initrd_filename);
> +            exit(1);
> +        }
> +    }
> +}
> +
> +static void powernv_machine_class_init(ObjectClass *oc, void *data)
> +{
> +    MachineClass *mc = MACHINE_CLASS(oc);
> +
> +    mc->desc = "IBM PowerNV (Non-Virtualized)";
> +    mc->init = ppc_powernv_init;
> +    mc->reset = ppc_powernv_reset;
> +    mc->max_cpus = MAX_CPUS;
> +    mc->block_default_type = IF_IDE; /* Pnv provides a AHCI device for
> +                                      * storage */
> +    mc->no_parallel = 1;
> +    mc->default_boot_order = NULL;
> +    mc->default_ram_size = 1 * G_BYTE;
> +}
> +
> +static const TypeInfo powernv_machine_info = {
> +    .name          = TYPE_POWERNV_MACHINE,
> +    .parent        = TYPE_MACHINE,
> +    .instance_size = sizeof(PnvMachineState),
> +    .class_init    = powernv_machine_class_init,
> +};
> +
> +static void powernv_machine_register_types(void)
> +{
> +    type_register_static(&powernv_machine_info);
> +}
> +
> +type_init(powernv_machine_register_types)
> diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
> new file mode 100644
> index 000000000000..c8a73bc74267
> --- /dev/null
> +++ b/include/hw/ppc/pnv.h
> @@ -0,0 +1,38 @@
> +/*
> + * QEMU PowerPC PowerNV various definitions
> + *
> + * Copyright (c) 2014-2016 BenH, IBM Corporation.
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, see 
> <http://www.gnu.org/licenses/>.
> + */
> +#ifndef _PPC_PNV_H
> +#define _PPC_PNV_H
> +
> +#include "hw/boards.h"
> +
> +#define TYPE_POWERNV_MACHINE       MACHINE_TYPE_NAME("powernv")
> +#define POWERNV_MACHINE(obj) \
> +    OBJECT_CHECK(PnvMachineState, (obj), TYPE_POWERNV_MACHINE)
> +
> +typedef struct PnvMachineState {
> +    /*< private >*/
> +    MachineState parent_obj;
> +
> +    uint32_t initrd_base;
> +    long initrd_size;
> +} PnvMachineState;
> +
> +#define POWERNV_FDT_ADDR                0x01000000
> +
> +#endif /* _PPC_PNV_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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