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x86: Drop unnecessary mp_init logic

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Now that sequence numbers are set up when devices are bound, this code is
not needed. Also, we should use dev_seq() instead of req_seq. Update the
whole file accordingly.

Also fix up APL cpu while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-12-16 21:20:22 -07:00
parent b27347f425
commit df3dc20952
3 changed files with 9 additions and 18 deletions
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2
arch/x86/cpu/apollolake/cpu.c
View file

@ -63,7 +63,7 @@ static int apl_get_info(const struct udevice *dev, struct cpu_info *info)
static int acpi_cpu_fill_ssdt(const struct udevice *dev, struct acpi_ctx *ctx)
{
uint core_id = dev->req_seq;
uint core_id = dev_seq(dev);
int cores_per_package;
int ret;

23
arch/x86/cpu/mp_init.c
View file

@ -87,7 +87,7 @@ DECLARE_GLOBAL_DATA_PTR;
* intel,apic-id = <2>;
* };
*
* Here the 'reg' property is the CPU number and then is placed in dev->req_seq
* Here the 'reg' property is the CPU number and then is placed in dev_seq(cpu)
* so that we can index into ap_callbacks[] using that. The APIC ID is different
* and may not be sequential (it typically is if hyperthreading is supported).
*
@ -135,7 +135,7 @@ struct mp_flight_plan {
*
* @func: Function to run
* @arg: Argument to pass to the function
* @logical_cpu_number: Either a CPU number (i.e. dev->req_seq) or a special
* @logical_cpu_number: Either a CPU number (i.e. dev_seq(cpu) or a special
* value like MP_SELECT_BSP. It tells the AP whether it should process this
* callback
*/
@ -152,7 +152,7 @@ static struct mp_flight_plan mp_info;
* ap_callbacks - Callback mailbox array
*
* Array of callback, one entry for each available CPU, indexed by the CPU
* number, which is dev->req_seq. The entry for the main CPU is never used.
* number, which is dev_seq(cpu). The entry for the main CPU is never used.
* When this is NULL, there is no pending work for the CPU to run. When
* non-NULL it points to the mp_callback structure. This is shared between all
* CPUs, so should only be written by the main CPU.
@ -562,7 +562,7 @@ static int get_bsp(struct udevice **devp, int *cpu_countp)
if (cpu_countp)
*cpu_countp = ret;
return dev->req_seq >= 0 ? dev->req_seq : 0;
return dev_seq(dev) >= 0 ? dev_seq(dev) : 0;
}
/**
@ -614,7 +614,7 @@ static void store_callback(struct mp_callback **slot, struct mp_callback *val)
static int run_ap_work(struct mp_callback *callback, struct udevice *bsp,
int num_cpus, uint expire_ms)
{
int cur_cpu = bsp->req_seq;
int cur_cpu = dev_seq(bsp);
int num_aps = num_cpus - 1; /* number of non-BSPs to get this message */
int cpus_accepted;
ulong start;
@ -679,7 +679,7 @@ static int ap_wait_for_instruction(struct udevice *cpu, void *unused)
if (!IS_ENABLED(CONFIG_SMP_AP_WORK))
return 0;
per_cpu_slot = &ap_callbacks[cpu->req_seq];
per_cpu_slot = &ap_callbacks[dev_seq(cpu)];
while (1) {
struct mp_callback *cb = read_callback(per_cpu_slot);
@ -694,7 +694,7 @@ static int ap_wait_for_instruction(struct udevice *cpu, void *unused)
mfence();
if (lcb.logical_cpu_number == MP_SELECT_ALL ||
lcb.logical_cpu_number == MP_SELECT_APS ||
cpu->req_seq == lcb.logical_cpu_number)
dev_seq(cpu) == lcb.logical_cpu_number)
lcb.func(lcb.arg);
/* Indicate we are finished */
@ -839,7 +839,6 @@ int mp_init(void)
int num_aps, num_cpus;
atomic_t *ap_count;
struct udevice *cpu;
struct uclass *uc;
int ret;
if (IS_ENABLED(CONFIG_QFW)) {
@ -848,14 +847,6 @@ int mp_init(void)
return ret;
}
/*
* Multiple APs are brought up simultaneously and they may get the same
* seq num in the uclass_resolve_seq() during device_probe(). To avoid
* this, set req_seq to the reg number in the device tree in advance.
*/
uclass_id_foreach_dev(UCLASS_CPU, cpu, uc)
cpu->req_seq = dev_read_u32_default(cpu, "reg", -1);
ret = get_bsp(&cpu, &num_cpus);
if (ret < 0) {
debug("Cannot init boot CPU: err=%d\n", ret);

2
arch/x86/include/asm/mp.h
View file

@ -114,7 +114,7 @@ typedef void (*mp_run_func)(void *arg);
* Running on anything other than the boot CPU is only supported if
* CONFIG_SMP_AP_WORK is enabled
*
* @cpu_select: CPU to run on (its dev->req_seq value), or MP_SELECT_ALL for
* @cpu_select: CPU to run on (its dev_seq() value), or MP_SELECT_ALL for
* all, or MP_SELECT_BSP for BSP
* @func: Function to run
* @arg: Argument to pass to the function