ppc/pnv: add skeleton PowerNV platform

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 <benh@kernel.crashing.org>
[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 <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

2 files changed, 228 insertions, 0 deletions

diff --git a/hw/ppc/Makefile.objs b/hw/ppc/Makefile.objs
index 99a0d4e..8105db7 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 0000000..8d98509
--- /dev/null
+++ b/hw/ppc/pnv.c
@@ -0,0 +1,226 @@
+/*
+ * 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 (POWER8), 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("memory@%"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(MachineState *machine)
+{
+    const char plat_compat[] = "qemu,powernv\0ibm,powernv";
+    PnvMachineState *pnv = POWERNV_MACHINE(machine);
+    void *fdt;
+    char *buf;
+    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 (machine->kernel_cmdline) {
+        _FDT((fdt_setprop_string(fdt, off, "bootargs",
+                                 machine->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))));
+    }
+
+    /* TODO: 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, machine->ram_size);
+
+    return fdt;
+}
+
+static void ppc_powernv_reset(void)
+{
+    MachineState *machine = MACHINE(qdev_get_machine());
+    void *fdt;
+
+    qemu_devices_reset();
+
+    fdt = powernv_create_fdt(machine);
+
+    /* Pack resulting tree */
+    _FDT((fdt_pack(fdt)));
+
+    cpu_physical_memory_write(PNV_FDT_ADDR, fdt, fdt_totalsize(fdt));
+}
+
+static void ppc_powernv_init(MachineState *machine)
+{
+    PnvMachineState *pnv = POWERNV_MACHINE(machine);
+    MemoryRegion *ram;
+    char *fw_filename;
+    long fw_size;
+
+    /* allocate RAM */
+    if (machine->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",
+                                         machine->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 */
+    if (machine->kernel_filename) {
+        long kernel_size;
+
+        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)