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Re: [Qemu-devel] [PATCH 1/3] ppc/pnv: add skeleton PowerNV platform
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From: |
David Gibson |
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Subject: |
Re: [Qemu-devel] [PATCH 1/3] ppc/pnv: add skeleton PowerNV platform |
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Date: |
Mon, 29 Aug 2016 10:16:40 -0400 |
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User-agent: |
Mutt/1.7.0 (2016-08-17) |
On Fri, Aug 26, 2016 at 04:47:08PM +0200, Cédric Le Goater wrote:
> On 08/16/2016 04:12 AM, David Gibson wrote:
> > On Fri, Aug 05, 2016 at 11:15:35AM +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
> >> - and then, I got lost with the changes.
> >> ]
> >> Signed-off-by: Cédric Le Goater <address@hidden>
> >> ---
> >> default-configs/ppc64-softmmu.mak | 1 +
> >> hw/ppc/Makefile.objs | 2 +
> >> hw/ppc/pnv.c | 283
> >> ++++++++++++++++++++++++++++++++++++++
> >> include/hw/ppc/pnv.h | 36 +++++
> >> 4 files changed, 322 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 c4be59f638ed..516a6e25aba3 100644
> >> --- a/default-configs/ppc64-softmmu.mak
> >> +++ b/default-configs/ppc64-softmmu.mak
> >> @@ -40,6 +40,7 @@ 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..3bb6a240c25b
> >> --- /dev/null
> >> +++ b/hw/ppc/pnv.c
> >> @@ -0,0 +1,283 @@
> >> +/*
> >> + * QEMU PowerPC PowerNV model
> >> + *
> >> + * Copyright (c) 2004-2007 Fabrice Bellard
> >> + * Copyright (c) 2007 Jocelyn Mayer
> >> + * Copyright (c) 2010 David Gibson, IBM Corporation.
> >> + * Copyright (c) 2014-2016 BenH, IBM Corporation.
> >> + *
> >> + * Permission is hereby granted, free of charge, to any person obtaining
> >> a copy
> >> + * of this software and associated documentation files (the "Software"),
> >> to deal
> >> + * in the Software without restriction, including without limitation the
> >> rights
> >> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or
> >> sell
> >> + * copies of the Software, and to permit persons to whom the Software is
> >> + * furnished to do so, subject to the following conditions:
> >> + *
> >> + * The above copyright notice and this permission notice shall be
> >> included in
> >> + * all copies or substantial portions of the Software.
> >> + *
> >> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> >> EXPRESS OR
> >> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> >> MERCHANTABILITY,
> >> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> >> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
> >> OTHER
> >> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> >> ARISING FROM,
> >> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> >> IN
> >> + * THE SOFTWARE.
> >> + *
> >> + */
> >> +#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_ADDR 0x01000000
> >> +#define FDT_MAX_SIZE 0x00100000
> >> +#define FW_MAX_SIZE 0x00400000
> >> +#define FW_FILE_NAME "skiboot.lid"
> >> +
> >> +#define MAX_CPUS 255
> >
> > So, this is copied from pseries, which in turn copied it from either
> > mac99 or pc (I forget which). But having a MAX_CPUS which is not a
> > multiple of the maximum threads-per-core is kind of dumb, especially
> > in light of the new hotplug mechanisms. So let's not repeat this make
> > another time, and round this off to a multiple of 8.
>
> yes. I made that 2048.
Ok.
> >> +static void powernv_populate_memory_node(void *fdt, int nodeid, hwaddr
> >> start,
> >> + hwaddr size)
> >> +{
> >> + /* Probably bogus, need to match with what's going on in CPU nodes */
> >> + uint32_t chip_id = nodeid;
> >> + char *mem_name;
> >> + uint64_t mem_reg_property[2];
> >> +
> >> + mem_reg_property[0] = cpu_to_be64(start);
> >> + mem_reg_property[1] = cpu_to_be64(size);
> >> +
> >> + mem_name = g_strdup_printf("memory@"TARGET_FMT_lx, start);
> >> + _FDT((fdt_begin_node(fdt, mem_name)));
> >> + g_free(mem_name);
> >> + _FDT((fdt_property_string(fdt, "device_type", "memory")));
> >> + _FDT((fdt_property(fdt, "reg", mem_reg_property,
> >> + sizeof(mem_reg_property))));
> >> + _FDT((fdt_property_cell(fdt, "ibm,chip-id", chip_id)));
> >> + _FDT((fdt_end_node(fdt)));
> >> +}
> >> +
> >> +static int powernv_populate_memory(void *fdt)
> >> +{
> >> + hwaddr mem_start, node_size;
> >> + int i, nb_nodes = nb_numa_nodes;
> >> + NodeInfo *nodes = numa_info;
> >> + NodeInfo ramnode;
> >> +
> >> + /* No NUMA nodes, assume there is just one node with whole RAM */
> >> + if (!nb_numa_nodes) {
> >> + nb_nodes = 1;
> >> + ramnode.node_mem = ram_size;
> >> + nodes = &ramnode;
> >> + }
> >> +
> >> + for (i = 0, mem_start = 0; i < nb_nodes; ++i) {
> >> + if (!nodes[i].node_mem) {
> >> + continue;
> >> + }
> >> + if (mem_start >= ram_size) {
> >> + node_size = 0;
> >> + } else {
> >> + node_size = nodes[i].node_mem;
> >> + if (node_size > ram_size - mem_start) {
> >> + node_size = ram_size - mem_start;
> >> + }
> >> + }
> >> + for ( ; node_size; ) {
> >
> > This is equivalent to just while (node_size), which would be clearer.
> >
> >> + hwaddr sizetmp = pow2floor(node_size);
> >> +
> >> + /* mem_start != 0 here */
> >
> > Um.. that's not true on the very first iteration, AFAICT..
> >
> >> + if (ctzl(mem_start) < ctzl(sizetmp)) {
> >> + sizetmp = 1ULL << ctzl(mem_start);
> >> + }
> >> +
> >> + powernv_populate_memory_node(fdt, i, mem_start, sizetmp);
> >> + node_size -= sizetmp;
> >> + mem_start += sizetmp;
> >> + }
> >
> > IIUC this code is basically breaking the memory representation up into
> > naturally aligned chunks. Is that right? A comment to that effect
> > might make it easier to follow.
>
> That routine came from spar with some minor hacks.
Ah, so it is. I'd forgotten that code there, guess it needs a clean
up.
> So, in the current patchset, I removed all of it as on powernv 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.
Ok.
> We will start with one chip, so one memory node with all the RAM in it. Then,
> when we add more chips, we will have to figure out how to assign RAM to some
> and no RAM to others. I guess the numa API will come into play but I haven't
> look deeper yet.
Right, there will be some complexities here. Let's cross that bridge
when we come to it.
>
> >> + }
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static void *powernv_create_fdt(sPowerNVMachineState *pnv,
> >> + const char *kernel_cmdline)
> >> +{
> >> + void *fdt;
> >> + uint32_t start_prop = cpu_to_be32(pnv->initrd_base);
> >> + uint32_t end_prop = cpu_to_be32(pnv->initrd_base + pnv->initrd_size);
> >> + char *buf;
> >> + const char plat_compat[] = "qemu,powernv\0ibm,powernv";
> >> +
> >> + fdt = g_malloc0(FDT_MAX_SIZE);
> >> + _FDT((fdt_create(fdt, FDT_MAX_SIZE)));
> >> + _FDT((fdt_finish_reservemap(fdt)));
> >> +
> >> + /* Root node */
> >> + _FDT((fdt_begin_node(fdt, "")));
> >> + _FDT((fdt_property_string(fdt, "model", "IBM PowerNV (emulated by
> >> qemu)")));
> >> + _FDT((fdt_property(fdt, "compatible", plat_compat,
> >> sizeof(plat_compat))));
> >> +
> >> + buf = g_strdup_printf(UUID_FMT, qemu_uuid[0], qemu_uuid[1],
> >> + qemu_uuid[2], qemu_uuid[3], qemu_uuid[4],
> >> + qemu_uuid[5], qemu_uuid[6], qemu_uuid[7],
> >> + qemu_uuid[8], qemu_uuid[9], qemu_uuid[10],
> >> + qemu_uuid[11], qemu_uuid[12], qemu_uuid[13],
> >> + qemu_uuid[14], qemu_uuid[15]);
> >> +
> >> + _FDT((fdt_property_string(fdt, "vm,uuid", buf)));
> >> + g_free(buf);
> >> +
> >> + _FDT((fdt_begin_node(fdt, "chosen")));
> >> + if (kernel_cmdline) {
> >> + _FDT((fdt_property_string(fdt, "bootargs", kernel_cmdline)));
> >> + }
> >> + _FDT((fdt_property(fdt, "linux,initrd-start",
> >> + &start_prop, sizeof(start_prop))));
> >> + _FDT((fdt_property(fdt, "linux,initrd-end",
> >> + &end_prop, sizeof(end_prop))));
> >> + _FDT((fdt_end_node(fdt)));
> >> +
> >> + _FDT((fdt_property_cell(fdt, "#address-cells", 0x2)));
> >> + _FDT((fdt_property_cell(fdt, "#size-cells", 0x2)));
> >
> > You're writing the fdt sequentially, which means all properties for a
> > node need to be constructed before any subnodes, so this can't work.
> > I'm not quite sure what will happen here, but I suspect you only get
> > away with it because these are the default values for #address-cells
> > and #size-cells anyway.
> >
> > Ideally, fdt_property() would give an error in this case, but that's
> > not at all trivial to implement.
> >
> > Alternatively, you could change to using the fdt "rw" functions
> > (random access) instead of the "sw" (sequential) functions. That
> > would let you build things in any order, and might be a bit easier to
> > convert to a "live" tree representation, which I'm hoping to introduce
> > in the qemu-2.8 timeframe.
>
> I have changed the whole patchset to use the fdt "rw" functions. It
> made my life easier to populate the device tree with devices found
> on the command line, like the IPMI BT device.
Sounds reasonable.
> A few questions on that topic,
>
> what is the difference between the 'fdt_' api and the 'qemu_fdt_' api ?
Heh.
So, the fdt_* functions are the raw API exported by libfdt itself.
The qemu_fdt_* functions are a limited wrapper around these originally
created for some of the embedded machine types.
IMO, there's not actually a lot of value to that wrapper, and little
reason not to use the fdt api directly. So, I'd encourage using the
plain fdt_* functions, at least until my in-the-works patches for
better handling of dt creation within qemu get somewhere.
> Which one should we use ?
>
> I duplicated (again) create_device_tree() because of the fixed size.
> May be we could introduce something like :
>
> +static void *powernv_create_device_tree(int size)
> +{
> + void *fdt = g_malloc0(size);
> +
> + _FDT((fdt_create(fdt, size)));
> + _FDT((fdt_finish_reservemap(fdt)));
> + _FDT((fdt_begin_node(fdt, "")));
> + _FDT((fdt_end_node(fdt)));
> + _FDT((fdt_finish(fdt)));
> + _FDT((fdt_open_into(fdt, fdt, size)));
> +
> + return fdt;
> +}
>
> ?
So, current libfdt actually has such a function built in -
fdt_create_empty_tree(). We should really make sure the submodule
includes a recent enough version and use that.
> >> + /* Memory */
> >> + _FDT((powernv_populate_memory(fdt)));
> >> +
> >> + _FDT((fdt_end_node(fdt))); /* close root node */
> >> + _FDT((fdt_finish(fdt)));
> >> +
> >> + return fdt;
> >> +}
> >> +
> >> +static void ppc_powernv_reset(void)
> >> +{
> >> + MachineState *machine = MACHINE(qdev_get_machine());
> >> + sPowerNVMachineState *pnv = POWERNV_MACHINE(machine);
> >> + void *fdt;
> >> +
> >> + qemu_devices_reset();
> >> +
> >> + fdt = powernv_create_fdt(pnv, machine->kernel_cmdline);
> >> +
> >> + cpu_physical_memory_write(FDT_ADDR, fdt, fdt_totalsize(fdt));
> >> +}
> >> +
> >> +static void ppc_powernv_init(MachineState *machine)
> >> +{
> >> + ram_addr_t ram_size = machine->ram_size;
> >> + const char *kernel_filename = machine->kernel_filename;
> >> + const char *initrd_filename = machine->initrd_filename;
> >> + MemoryRegion *sysmem = get_system_memory();
> >> + MemoryRegion *ram = g_new(MemoryRegion, 1);
> >> + sPowerNVMachineState *pnv = POWERNV_MACHINE(machine);
> >> + long fw_size;
> >> + char *filename;
> >> +
> >> + if (ram_size < (1 * G_BYTE)) {
> >> + error_report("Warning: skiboot may not work with < 1GB of RAM");
> >> + }
> >> +
> >> + /* allocate RAM */
> >> + memory_region_allocate_system_memory(ram, NULL, "ppc_powernv.ram",
> >> + ram_size);
> >> + memory_region_add_subregion(sysmem, 0, ram);
> >> +
> >> + if (bios_name == NULL) {
> >> + bios_name = FW_FILE_NAME;
> >> + }
> >> + filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
> >> + fw_size = load_image_targphys(filename, 0, FW_MAX_SIZE);
> >> + if (fw_size < 0) {
> >> + hw_error("qemu: could not load OPAL '%s'\n", filename);
> >> + exit(1);
> >> + }
> >> + g_free(filename);
> >> +
> >> + filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, kernel_filename);
> >
> > I don't think qemu_find_file(QEMU_FILE_TYPE_BIOS) is usually used for
> > kernels. Is this really what you want?
>
> no. fixed.
>
> >> + if (!filename) {
> >> + hw_error("qemu: could find kernel '%s'\n", kernel_filename);
> >> + exit(1);
> >> + }
> >> +
> >> + fw_size = load_image_targphys(filename, 0x20000000, 0x2000000);
> >> + if (fw_size < 0) {
> >> + hw_error("qemu: could not load kernel'%s'\n", filename);
> >> + exit(1);
> >> + }
> >> + g_free(filename);
> >> +
> >> + /* load initrd */
> >> + if (initrd_filename) {
> >> + /* Try to locate the initrd in the gap between the kernel
> >> + * and the firmware. Add a bit of space just in case
> >> + */
> >> + pnv->initrd_base = 0x40000000;
> >> + pnv->initrd_size = load_image_targphys(initrd_filename,
> >> + pnv->initrd_base, 0x10000000); /* 128MB max */
> >> + if (pnv->initrd_size < 0) {
> >> + error_report("qemu: could not load initial ram disk
> >> '%s'",
> >> + initrd_filename);
> >> + exit(1);
> >> + }
> >> + } else {
> >> + pnv->initrd_base = 0;
> >> + pnv->initrd_size = 0;
> >> + }
> >> +}
> >> +
> >> +static void powernv_machine_class_init(ObjectClass *oc, void *data)
> >> +{
> >> + MachineClass *mc = MACHINE_CLASS(oc);
> >> +
> >> + mc->init = ppc_powernv_init;
> >> + mc->reset = ppc_powernv_reset;
> >> + mc->block_default_type = IF_IDE;
> >
> > IDE? Really?
>
> nah :) It's SCSI again now.
>
> I was trying to reconcile all the little hunks in the different
> patches of Ben. IF_IDE was introduced at the end of the patchset.
> I suppose that adding a ISA bus to PowerNV had some influence :)
>
> >
> >> + mc->max_cpus = MAX_CPUS;
> >> + 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,
> >> + .abstract = true,
> >> + .instance_size = sizeof(sPowerNVMachineState),
> >> + .class_init = powernv_machine_class_init,
> >> +};
> >> +
> >> +static void powernv_machine_2_8_class_init(ObjectClass *oc, void *data)
> >> +{
> >> + MachineClass *mc = MACHINE_CLASS(oc);
> >> +
> >> + mc->name = "powernv-2.8";
> >> + mc->desc = "PowerNV v2.8";
> >> + mc->alias = "powernv";
> >> +}
> >> +
> >> +static const TypeInfo powernv_machine_2_8_info = {
> >> + .name = MACHINE_TYPE_NAME("powernv-2.8"),
> >> + .parent = TYPE_POWERNV_MACHINE,
> >> + .class_init = powernv_machine_2_8_class_init,
> >> +};
> >
> > It might be simpler to just begin with an "unversioned" machine type.
>
> yes. fixed.
>
> > You only really need to start worrying about versions once its
> > sufficiently stable that you care about migration between different
> > qemu versions.
> >
> >> +static void powernv_machine_register_types(void)
> >> +{
> >> + type_register_static(&powernv_machine_info);
> >> + type_register_static(&powernv_machine_2_8_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..2990f691672d
> >> --- /dev/null
> >> +++ b/include/hw/ppc/pnv.h
> >> @@ -0,0 +1,36 @@
> >> +/*
> >> + * QEMU 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 "powernv-machine"
> >> +#define POWERNV_MACHINE(obj) \
> >> + OBJECT_CHECK(sPowerNVMachineState, (obj), TYPE_POWERNV_MACHINE)
> >> +
> >> +typedef struct sPowerNVMachineState {
> >
> > What's the "s" at the beginning for? Looks like it's copied from
> > sPAPR into a context where it doesn't really make sense.
>
> It is now called PnvMachineState.
>
> You can see the changes with your inputs here:
>
> https://github.com/legoater/qemu/commits/powernv-ipmi-2.8?page=2
>
> I would like to get the chips, the cores and the xscom bus 'mostly' right
> first, so the rest is in a working state.
>
> Thanks,
>
> C.
>
> >> + /*< private >*/
> >> + MachineState parent_obj;
> >> +
> >> + uint32_t initrd_base;
> >> + long initrd_size;
> >> +} sPowerNVMachineState;
> >> +
> >> +#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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[Qemu-devel] [PATCH 2/3] ppc/pnv: add a PnvChip object, Cédric Le Goater, 2016/08/05
Re: [Qemu-devel] [PATCH 2/3] ppc/pnv: add a PnvChip object, David Gibson, 2016/08/15
[Qemu-devel] [PATCH 3/3] ppc/pnv: add a PowerNVCPUCore object, Cédric Le Goater, 2016/08/05