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Re: [Qemu-arm] [PATCH 06/19] aspeed: introduce a configurable number of
From: |
Joel Stanley |
Subject: |
Re: [Qemu-arm] [PATCH 06/19] aspeed: introduce a configurable number of CPU per machine |
Date: |
Wed, 12 Jun 2019 01:32:40 +0000 |
On Sat, 25 May 2019 at 15:13, Cédric Le Goater <address@hidden> wrote:
>
> The current models of the Aspeed SoCs only have one CPU but future
> ones will support SMP. Introduce a way to configure the maximum number
> of CPU per machine. SMP support will be activated when models for such
> SoCs are implemented.
>
> Signed-off-by: Cédric Le Goater <address@hidden>
> ---
> include/hw/arm/aspeed.h | 1 +
> include/hw/arm/aspeed_soc.h | 3 ++-
> hw/arm/aspeed.c | 8 ++++++--
> hw/arm/aspeed_soc.c | 17 +++++++++++------
> 4 files changed, 20 insertions(+), 9 deletions(-)
>
> diff --git a/include/hw/arm/aspeed.h b/include/hw/arm/aspeed.h
> index 02073a6b4d61..f2f238ea83cc 100644
> --- a/include/hw/arm/aspeed.h
> +++ b/include/hw/arm/aspeed.h
> @@ -23,6 +23,7 @@ typedef struct AspeedBoardConfig {
> uint32_t num_cs;
> void (*i2c_init)(AspeedBoardState *bmc);
> uint32_t ram;
> + uint32_t num_cpus;
> } AspeedBoardConfig;
>
> #define TYPE_ASPEED_MACHINE MACHINE_TYPE_NAME("aspeed")
> diff --git a/include/hw/arm/aspeed_soc.h b/include/hw/arm/aspeed_soc.h
> index fa0ba957a611..7247f6da2505 100644
> --- a/include/hw/arm/aspeed_soc.h
> +++ b/include/hw/arm/aspeed_soc.h
> @@ -24,13 +24,14 @@
>
> #define ASPEED_SPIS_NUM 2
> #define ASPEED_WDTS_NUM 3
> +#define ASPEED_CPUS_NUM 2
>
> typedef struct AspeedSoCState {
> /*< private >*/
> DeviceState parent;
>
> /*< public >*/
> - ARMCPU cpu;
> + ARMCPU cpu[ASPEED_CPUS_NUM];
> MemoryRegion sram;
> AspeedVICState vic;
> AspeedRtcState rtc;
> diff --git a/hw/arm/aspeed.c b/hw/arm/aspeed.c
> index 10ba3f50481a..004b0c318951 100644
> --- a/hw/arm/aspeed.c
> +++ b/hw/arm/aspeed.c
> @@ -29,7 +29,6 @@
>
> static struct arm_boot_info aspeed_board_binfo = {
> .board_id = -1, /* device-tree-only board */
> - .nb_cpus = 1,
> };
>
> struct AspeedBoardState {
> @@ -231,6 +230,7 @@ static void aspeed_board_init(MachineState *machine,
> aspeed_board_binfo.kernel_cmdline = machine->kernel_cmdline;
> aspeed_board_binfo.ram_size = ram_size;
> aspeed_board_binfo.loader_start = sc->info->memmap[ASPEED_SDRAM];
> + aspeed_board_binfo.nb_cpus = cfg->num_cpus;
>
> if (cfg->i2c_init) {
> cfg->i2c_init(bmc);
> @@ -327,7 +327,7 @@ static void aspeed_machine_class_init(ObjectClass *oc,
> void *data)
>
> mc->desc = board->desc;
> mc->init = aspeed_machine_init;
> - mc->max_cpus = 1;
> + mc->max_cpus = ASPEED_CPUS_NUM;
> mc->no_sdcard = 1;
> mc->no_floppy = 1;
> mc->no_cdrom = 1;
> @@ -357,6 +357,7 @@ static const AspeedBoardConfig aspeed_boards[] = {
> .num_cs = 1,
> .i2c_init = palmetto_bmc_i2c_init,
> .ram = 256 * MiB,
> + .num_cpus = 1,
> }, {
> .name = MACHINE_TYPE_NAME("ast2500-evb"),
> .desc = "Aspeed AST2500 EVB (ARM1176)",
> @@ -367,6 +368,7 @@ static const AspeedBoardConfig aspeed_boards[] = {
> .num_cs = 1,
> .i2c_init = ast2500_evb_i2c_init,
> .ram = 512 * MiB,
> + .num_cpus = 1,
> }, {
> .name = MACHINE_TYPE_NAME("romulus-bmc"),
> .desc = "OpenPOWER Romulus BMC (ARM1176)",
> @@ -377,6 +379,7 @@ static const AspeedBoardConfig aspeed_boards[] = {
> .num_cs = 2,
> .i2c_init = romulus_bmc_i2c_init,
> .ram = 512 * MiB,
> + .num_cpus = 1,
> }, {
> .name = MACHINE_TYPE_NAME("witherspoon-bmc"),
> .desc = "OpenPOWER Witherspoon BMC (ARM1176)",
> @@ -387,6 +390,7 @@ static const AspeedBoardConfig aspeed_boards[] = {
> .num_cs = 2,
> .i2c_init = witherspoon_bmc_i2c_init,
> .ram = 512 * MiB,
> + .num_cpus = 1,
> },
> };
>
> diff --git a/hw/arm/aspeed_soc.c b/hw/arm/aspeed_soc.c
> index d1dc8f03f35c..b983d5efc5d1 100644
> --- a/hw/arm/aspeed_soc.c
> +++ b/hw/arm/aspeed_soc.c
> @@ -172,8 +172,11 @@ static void aspeed_soc_init(Object *obj)
> AspeedSoCClass *sc = ASPEED_SOC_GET_CLASS(s);
> int i;
>
> - object_initialize_child(obj, "cpu", OBJECT(&s->cpu), sizeof(s->cpu),
> - sc->info->cpu_type, &error_abort, NULL);
> + for (i = 0; i < MIN(smp_cpus, ASPEED_CPUS_NUM); i++) {
What's the intent of this test?
If we're checking that the user hasn't requested more CPUs that the
SoC supports, shoudln't it be testing against ->num_cpus instead of
ASPEED_CPUS_NUM?
> + object_initialize_child(obj, "cpu[*]", OBJECT(&s->cpu[i]),
> + sizeof(s->cpu[i]), sc->info->cpu_type,
> + &error_abort, NULL);
> + }
>
> sysbus_init_child_obj(obj, "scu", OBJECT(&s->scu), sizeof(s->scu),
> TYPE_ASPEED_SCU);
> @@ -242,10 +245,12 @@ static void aspeed_soc_realize(DeviceState *dev, Error
> **errp)
> ASPEED_SOC_IOMEM_SIZE);
>
> /* CPU */
> - object_property_set_bool(OBJECT(&s->cpu), true, "realized", &err);
> - if (err) {
> - error_propagate(errp, err);
> - return;
> + for (i = 0; i < smp_cpus; i++) {
Can you explain why we use smp_cpus instead of ->num_cpus?
> + object_property_set_bool(OBJECT(&s->cpu[i]), true, "realized", &err);
> + if (err) {
> + error_propagate(errp, err);
> + return;
> + }
> }
>
> /* SRAM */
> --
> 2.20.1
>
- Re: [Qemu-arm] [PATCH 06/19] aspeed: introduce a configurable number of CPU per machine,
Joel Stanley <=