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x86: mp_init: Adjust bsp_init() to return more information

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This function is misnamed since it does not actually init the BSP. Also
it is convenient to adjust it to return a little more information.

Rename and update the function, to allow it to return the BSP CPU device
and number, as well as the total number of CPUs.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-07-17 08:48:14 -06:00 committed by Bin Meng
parent 77a5e2d3bc
commit 20b049e885
1 changed files with 23 additions and 13 deletions
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36
arch/x86/cpu/mp_init.c
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@ -421,9 +421,18 @@ static int bsp_do_flight_plan(struct udevice *cpu, struct mp_flight_plan *plan,
return ret;
}
static int init_bsp(struct udevice **devp)
/**
* get_bsp() - Get information about the bootstrap processor
*
* @devp: If non-NULL, returns CPU device corresponding to the BSP
* @cpu_countp: If non-NULL, returns the total number of CPUs
* @return CPU number of the BSP, or -ve on error. If multiprocessing is not
* enabled, returns 0
*/
static int get_bsp(struct udevice **devp, int *cpu_countp)
{
char processor_name[CPU_MAX_NAME_LEN];
struct udevice *dev;
int apic_id;
int ret;
@ -431,13 +440,20 @@ static int init_bsp(struct udevice **devp)
debug("CPU: %s\n", processor_name);
apic_id = lapicid();
ret = find_cpu_by_apic_id(apic_id, devp);
if (ret) {
ret = find_cpu_by_apic_id(apic_id, &dev);
if (ret < 0) {
printf("Cannot find boot CPU, APIC ID %d\n", apic_id);
return ret;
}
ret = cpu_get_count(dev);
if (ret < 0)
return log_msg_ret("count", ret);
if (devp)
*devp = dev;
if (cpu_countp)
*cpu_countp = ret;
return 0;
return dev->req_seq >= 0 ? dev->req_seq : 0;
}
static int mp_init_cpu(struct udevice *cpu, void *unused)
@ -476,24 +492,18 @@ int mp_init(void)
uclass_id_foreach_dev(UCLASS_CPU, cpu, uc)
cpu->req_seq = dev_read_u32_default(cpu, "reg", -1);
ret = init_bsp(&cpu);
if (ret) {
ret = get_bsp(&cpu, &num_cpus);
if (ret < 0) {
debug("Cannot init boot CPU: err=%d\n", ret);
return ret;
}
num_cpus = cpu_get_count(cpu);
if (num_cpus < 0) {
debug("Cannot get number of CPUs: err=%d\n", num_cpus);
return num_cpus;
}
if (num_cpus < 2)
debug("Warning: Only 1 CPU is detected\n");
ret = check_cpu_devices(num_cpus);
if (ret)
debug("Warning: Device tree does not describe all CPUs. Extra ones will not be started correctly\n");
log_warning("Warning: Device tree does not describe all CPUs. Extra ones will not be started correctly\n");
/* Copy needed parameters so that APs have a reference to the plan */
mp_info.num_records = ARRAY_SIZE(mp_steps);