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coreboot/src/cpu/x86/mp_init.c

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/*
* This file is part of the coreboot project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 of
* the License.
*
* This program 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 General Public License for more details.
*/
#include <console/console.h>
#include <stdint.h>
#include <string.h>
#include <rmodule.h>
#include <arch/cpu.h>
#include <commonlib/helpers.h>
#include <cpu/cpu.h>
#include <cpu/intel/microcode.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/gdt.h>
#include <cpu/x86/lapic.h>
#include <cpu/x86/name.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/smm.h>
#include <cpu/x86/mp.h>
#include <delay.h>
#include <device/device.h>
#include <device/path.h>
#include <smp/atomic.h>
#include <smp/spinlock.h>
#include <symbols.h>
#include <timer.h>
#include <thread.h>
#define MAX_APIC_IDS 256
struct mp_callback {
void (*func)(void *);
void *arg;
int logical_cpu_number;
};
static char processor_name[49];
/*
* A mp_flight_record details a sequence of calls for the APs to perform
* along with the BSP to coordinate sequencing. Each flight record either
* provides a barrier for each AP before calling the callback or the APs
* are allowed to perform the callback without waiting. Regardless, each
* record has the cpus_entered field incremented for each record. When
* the BSP observes that the cpus_entered matches the number of APs
* the bsp_call is called with bsp_arg and upon returning releases the
* barrier allowing the APs to make further progress.
*
* Note that ap_call() and bsp_call() can be NULL. In the NULL case the
* callback will just not be called.
*/
struct mp_flight_record {
atomic_t barrier;
atomic_t cpus_entered;
void (*ap_call)(void);
void (*bsp_call)(void);
} __aligned(CACHELINE_SIZE);
#define _MP_FLIGHT_RECORD(barrier_, ap_func_, bsp_func_) \
{ \
.barrier = ATOMIC_INIT(barrier_), \
.cpus_entered = ATOMIC_INIT(0), \
.ap_call = ap_func_, \
.bsp_call = bsp_func_, \
}
#define MP_FR_BLOCK_APS(ap_func_, bsp_func_) \
_MP_FLIGHT_RECORD(0, ap_func_, bsp_func_)
#define MP_FR_NOBLOCK_APS(ap_func_, bsp_func_) \
_MP_FLIGHT_RECORD(1, ap_func_, bsp_func_)
/* The mp_params structure provides the arguments to the mp subsystem
* for bringing up APs. */
struct mp_params {
int num_cpus; /* Total cpus include BSP */
int parallel_microcode_load;
const void *microcode_pointer;
/* Flight plan for APs and BSP. */
struct mp_flight_record *flight_plan;
int num_records;
};
/* This needs to match the layout in the .module_parametrs section. */
struct sipi_params {
uint16_t gdtlimit;
uint32_t gdt;
uint16_t unused;
uint32_t idt_ptr;
uint32_t stack_top;
uint32_t stack_size;
uint32_t microcode_lock; /* 0xffffffff means parallel loading. */
uint32_t microcode_ptr;
uint32_t msr_table_ptr;
uint32_t msr_count;
uint32_t c_handler;
atomic_t ap_count;
} __packed;
/* This also needs to match the assembly code for saved MSR encoding. */
struct saved_msr {
uint32_t index;
uint32_t lo;
uint32_t hi;
} __packed;
/* The sipi vector rmodule is included in the ramstage using 'objdump -B'. */
extern char _binary_sipi_vector_start[];
/* The SIPI vector is loaded at the SMM_DEFAULT_BASE. The reason is at the
* memory range is already reserved so the OS cannot use it. That region is
* free to use for AP bringup before SMM is initialized. */
static const uint32_t sipi_vector_location = SMM_DEFAULT_BASE;
static const int sipi_vector_location_size = SMM_DEFAULT_SIZE;
struct mp_flight_plan {
int num_records;
struct mp_flight_record *records;
};
static int global_num_aps;
static struct mp_flight_plan mp_info;
/* Keep track of device structure for each CPU. */
static struct device *cpus_dev[CONFIG_MAX_CPUS];
static inline void barrier_wait(atomic_t *b)
{
while (atomic_read(b) == 0)
asm ("pause");
mfence();
}
static inline void release_barrier(atomic_t *b)
{
mfence();
atomic_set(b, 1);
}
/* Returns 1 if timeout waiting for APs. 0 if target aps found. */
static int wait_for_aps(atomic_t *val, int target, int total_delay,
int delay_step)
{
int timeout = 0;
int delayed = 0;
while (atomic_read(val) != target) {
udelay(delay_step);
delayed += delay_step;
if (delayed >= total_delay) {
timeout = 1;
break;
}
}
return timeout;
}
static void ap_do_flight_plan(void)
{
int i;
for (i = 0; i < mp_info.num_records; i++) {
struct mp_flight_record *rec = &mp_info.records[i];
atomic_inc(&rec->cpus_entered);
barrier_wait(&rec->barrier);
if (rec->ap_call != NULL)
rec->ap_call();
}
}
static void park_this_cpu(void *unused)
{
stop_this_cpu();
}
/* By the time APs call ap_init() caching has been setup, and microcode has
* been loaded. */
static void asmlinkage ap_init(unsigned int cpu)
{
struct cpu_info *info;
/* Ensure the local APIC is enabled */
enable_lapic();
info = cpu_info();
info->index = cpu;
info->cpu = cpus_dev[cpu];
cpu_add_map_entry(info->index);
thread_init_cpu_info_non_bsp(info);
/* Fix up APIC id with reality. */
info->cpu->path.apic.apic_id = lapicid();
printk(BIOS_INFO, "AP: slot %d apic_id %x.\n", cpu,
info->cpu->path.apic.apic_id);
/* Walk the flight plan */
ap_do_flight_plan();
/* Park the AP. */
park_this_cpu(NULL);
}
static void setup_default_sipi_vector_params(struct sipi_params *sp)
{
sp->gdt = (uintptr_t)&gdt;
sp->gdtlimit = (uintptr_t)&gdt_end - (uintptr_t)&gdt - 1;
sp->idt_ptr = (uintptr_t)&idtarg;
sp->stack_size = CONFIG_STACK_SIZE;
sp->stack_top = ALIGN_DOWN((uintptr_t)&_estack, CONFIG_STACK_SIZE);
/* Adjust the stack top to take into account cpu_info. */
sp->stack_top -= sizeof(struct cpu_info);
}
#define NUM_FIXED_MTRRS 11
static const unsigned int fixed_mtrrs[NUM_FIXED_MTRRS] = {
MTRR_FIX_64K_00000, MTRR_FIX_16K_80000, MTRR_FIX_16K_A0000,
MTRR_FIX_4K_C0000, MTRR_FIX_4K_C8000, MTRR_FIX_4K_D0000,
MTRR_FIX_4K_D8000, MTRR_FIX_4K_E0000, MTRR_FIX_4K_E8000,
MTRR_FIX_4K_F0000, MTRR_FIX_4K_F8000,
};
static inline struct saved_msr *save_msr(int index, struct saved_msr *entry)
{
msr_t msr;
msr = rdmsr(index);
entry->index = index;
entry->lo = msr.lo;
entry->hi = msr.hi;
/* Return the next entry. */
entry++;
return entry;
}
static int save_bsp_msrs(char *start, int size)
{
int msr_count;
int num_var_mtrrs;
struct saved_msr *msr_entry;
int i;
msr_t msr;
/* Determine number of MTRRs need to be saved. */
msr = rdmsr(MTRR_CAP_MSR);
num_var_mtrrs = msr.lo & 0xff;
/* 2 * num_var_mtrrs for base and mask. +1 for IA32_MTRR_DEF_TYPE. */
msr_count = 2 * num_var_mtrrs + NUM_FIXED_MTRRS + 1;
if ((msr_count * sizeof(struct saved_msr)) > size) {
printk(BIOS_CRIT, "Cannot mirror all %d msrs.\n", msr_count);
return -1;
}
fixed_mtrrs_expose_amd_rwdram();
msr_entry = (void *)start;
for (i = 0; i < NUM_FIXED_MTRRS; i++)
msr_entry = save_msr(fixed_mtrrs[i], msr_entry);
for (i = 0; i < num_var_mtrrs; i++) {
msr_entry = save_msr(MTRR_PHYS_BASE(i), msr_entry);
msr_entry = save_msr(MTRR_PHYS_MASK(i), msr_entry);
}
msr_entry = save_msr(MTRR_DEF_TYPE_MSR, msr_entry);
fixed_mtrrs_hide_amd_rwdram();
/* Tell static analysis we know value is left unused. */
(void)msr_entry;
return msr_count;
}
static atomic_t *load_sipi_vector(struct mp_params *mp_params)
{
struct rmodule sipi_mod;
int module_size;
int num_msrs;
struct sipi_params *sp;
char *mod_loc = (void *)sipi_vector_location;
const int loc_size = sipi_vector_location_size;
atomic_t *ap_count = NULL;
if (rmodule_parse(&_binary_sipi_vector_start, &sipi_mod)) {
printk(BIOS_CRIT, "Unable to parse sipi module.\n");
return ap_count;
}
if (rmodule_entry_offset(&sipi_mod) != 0) {
printk(BIOS_CRIT, "SIPI module entry offset is not 0!\n");
return ap_count;
}
if (rmodule_load_alignment(&sipi_mod) != 4096) {
printk(BIOS_CRIT, "SIPI module load alignment(%d) != 4096.\n",
rmodule_load_alignment(&sipi_mod));
return ap_count;
}
module_size = rmodule_memory_size(&sipi_mod);
/* Align to 4 bytes. */
module_size = ALIGN_UP(module_size, 4);
if (module_size > loc_size) {
printk(BIOS_CRIT, "SIPI module size (%d) > region size (%d).\n",
module_size, loc_size);
return ap_count;
}
num_msrs = save_bsp_msrs(&mod_loc[module_size], loc_size - module_size);
if (num_msrs < 0) {
printk(BIOS_CRIT, "Error mirroring BSP's msrs.\n");
return ap_count;
}
if (rmodule_load(mod_loc, &sipi_mod)) {
printk(BIOS_CRIT, "Unable to load SIPI module.\n");
return ap_count;
}
sp = rmodule_parameters(&sipi_mod);
if (sp == NULL) {
printk(BIOS_CRIT, "SIPI module has no parameters.\n");
return ap_count;
}
setup_default_sipi_vector_params(sp);
/* Setup MSR table. */
sp->msr_table_ptr = (uint32_t)&mod_loc[module_size];
sp->msr_count = num_msrs;
/* Provide pointer to microcode patch. */
sp->microcode_ptr = (uint32_t)mp_params->microcode_pointer;
/* Pass on abiility to load microcode in parallel. */
if (mp_params->parallel_microcode_load)
sp->microcode_lock = 0;
else
sp->microcode_lock = ~0;
sp->c_handler = (uint32_t)&ap_init;
ap_count = &sp->ap_count;
atomic_set(ap_count, 0);
return ap_count;
}
static int allocate_cpu_devices(struct bus *cpu_bus, struct mp_params *p)
{
int i;
int max_cpus;
struct cpu_info *info;
max_cpus = p->num_cpus;
if (max_cpus > CONFIG_MAX_CPUS) {
printk(BIOS_CRIT, "CPU count(%d) exceeds CONFIG_MAX_CPUS(%d)\n",
max_cpus, CONFIG_MAX_CPUS);
max_cpus = CONFIG_MAX_CPUS;
}
info = cpu_info();
for (i = 1; i < max_cpus; i++) {
struct device_path cpu_path;
struct device *new;
/* Build the CPU device path */
cpu_path.type = DEVICE_PATH_APIC;
/* Assuming linear APIC space allocation. AP will set its own
APIC id in the ap_init() path above. */
cpu_path.apic.apic_id = info->cpu->path.apic.apic_id + i;
/* Allocate the new CPU device structure */
new = alloc_find_dev(cpu_bus, &cpu_path);
if (new == NULL) {
printk(BIOS_CRIT, "Could not allocate CPU device\n");
max_cpus--;
continue;
}
new->name = processor_name;
cpus_dev[i] = new;
}
return max_cpus;
}
/* Returns 1 for timeout. 0 on success. */
static int apic_wait_timeout(int total_delay, int delay_step)
{
int total = 0;
int timeout = 0;
while (lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY) {
udelay(delay_step);
total += delay_step;
if (total >= total_delay) {
timeout = 1;
break;
}
}
return timeout;
}
static int start_aps(struct bus *cpu_bus, int ap_count, atomic_t *num_aps)
{
int sipi_vector;
/* Max location is 4KiB below 1MiB */
const int max_vector_loc = ((1 << 20) - (1 << 12)) >> 12;
if (ap_count == 0)
return 0;
/* The vector is sent as a 4k aligned address in one byte. */
sipi_vector = sipi_vector_location >> 12;
if (sipi_vector > max_vector_loc) {
printk(BIOS_CRIT, "SIPI vector too large! 0x%08x\n",
sipi_vector);
return -1;
}
printk(BIOS_DEBUG, "Attempting to start %d APs\n", ap_count);
if ((lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY)) {
printk(BIOS_DEBUG, "Waiting for ICR not to be busy...");
if (apic_wait_timeout(1000 /* 1 ms */, 50)) {
printk(BIOS_DEBUG, "timed out. Aborting.\n");
return -1;
}
printk(BIOS_DEBUG, "done.\n");
}
/* Send INIT IPI to all but self. */
lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(0));
lapic_write_around(LAPIC_ICR, LAPIC_DEST_ALLBUT | LAPIC_INT_ASSERT |
LAPIC_DM_INIT);
printk(BIOS_DEBUG, "Waiting for 10ms after sending INIT.\n");
mdelay(10);
/* Send 1st SIPI */
if ((lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY)) {
printk(BIOS_DEBUG, "Waiting for ICR not to be busy...");
if (apic_wait_timeout(1000 /* 1 ms */, 50)) {
printk(BIOS_DEBUG, "timed out. Aborting.\n");
return -1;
}
printk(BIOS_DEBUG, "done.\n");
}
lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(0));
lapic_write_around(LAPIC_ICR, LAPIC_DEST_ALLBUT | LAPIC_INT_ASSERT |
LAPIC_DM_STARTUP | sipi_vector);
printk(BIOS_DEBUG, "Waiting for 1st SIPI to complete...");
if (apic_wait_timeout(10000 /* 10 ms */, 50 /* us */)) {
printk(BIOS_DEBUG, "timed out.\n");
return -1;
}
printk(BIOS_DEBUG, "done.\n");
/* Wait for CPUs to check in up to 200 us. */
wait_for_aps(num_aps, ap_count, 200 /* us */, 15 /* us */);
if (CONFIG(X86_AMD_INIT_SIPI))
return 0;
/* Send 2nd SIPI */
if ((lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY)) {
printk(BIOS_DEBUG, "Waiting for ICR not to be busy...");
if (apic_wait_timeout(1000 /* 1 ms */, 50)) {
printk(BIOS_DEBUG, "timed out. Aborting.\n");
return -1;
}
printk(BIOS_DEBUG, "done.\n");
}
lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(0));
lapic_write_around(LAPIC_ICR, LAPIC_DEST_ALLBUT | LAPIC_INT_ASSERT |
LAPIC_DM_STARTUP | sipi_vector);
printk(BIOS_DEBUG, "Waiting for 2nd SIPI to complete...");
if (apic_wait_timeout(10000 /* 10 ms */, 50 /* us */)) {
printk(BIOS_DEBUG, "timed out.\n");
return -1;
}
printk(BIOS_DEBUG, "done.\n");
/* Wait for CPUs to check in. */
if (wait_for_aps(num_aps, ap_count, 10000 /* 10 ms */, 50 /* us */)) {
printk(BIOS_DEBUG, "Not all APs checked in: %d/%d.\n",
atomic_read(num_aps), ap_count);
return -1;
}
return 0;
}
static int bsp_do_flight_plan(struct mp_params *mp_params)
{
int i;
int ret = 0;
/*
* Set time-out to wait for APs to a huge value (=1 second) since it
* could take a longer time for APs to check-in as the number of APs
* increases (contention for resources like UART also increases).
*/
const int timeout_us = 1000000;
const int step_us = 100;
int num_aps = mp_params->num_cpus - 1;
struct stopwatch sw;
stopwatch_init(&sw);
for (i = 0; i < mp_params->num_records; i++) {
struct mp_flight_record *rec = &mp_params->flight_plan[i];
/* Wait for APs if the record is not released. */
if (atomic_read(&rec->barrier) == 0) {
/* Wait for the APs to check in. */
if (wait_for_aps(&rec->cpus_entered, num_aps,
timeout_us, step_us)) {
printk(BIOS_ERR, "MP record %d timeout.\n", i);
ret = -1;
}
}
if (rec->bsp_call != NULL)
rec->bsp_call();
release_barrier(&rec->barrier);
}
printk(BIOS_INFO, "%s done after %ld msecs.\n", __func__,
stopwatch_duration_msecs(&sw));
return ret;
}
static void init_bsp(struct bus *cpu_bus)
{
struct device_path cpu_path;
struct cpu_info *info;
/* Print processor name */
fill_processor_name(processor_name);
printk(BIOS_INFO, "CPU: %s.\n", processor_name);
/* Ensure the local APIC is enabled */
enable_lapic();
/* Set the device path of the boot CPU. */
cpu_path.type = DEVICE_PATH_APIC;
cpu_path.apic.apic_id = lapicid();
/* Find the device structure for the boot CPU. */
info = cpu_info();
info->cpu = alloc_find_dev(cpu_bus, &cpu_path);
info->cpu->name = processor_name;
if (info->index != 0)
printk(BIOS_CRIT, "BSP index(%d) != 0!\n", info->index);
/* Track BSP in cpu_map structures. */
cpu_add_map_entry(info->index);
}
/*
* mp_init() will set up the SIPI vector and bring up the APs according to
* mp_params. Each flight record will be executed according to the plan. Note
* that the MP infrastructure uses SMM default area without saving it. It's
* up to the chipset or mainboard to either e820 reserve this area or save this
* region prior to calling mp_init() and restoring it after mp_init returns.
*
* At the time mp_init() is called the MTRR MSRs are mirrored into APs then
* caching is enabled before running the flight plan.
*
* The MP initialization has the following properties:
* 1. APs are brought up in parallel.
* 2. The ordering of coreboot CPU number and APIC ids is not deterministic.
* Therefore, one cannot rely on this property or the order of devices in
* the device tree unless the chipset or mainboard know the APIC ids
* a priori.
*
* mp_init() returns < 0 on error, 0 on success.
*/
static int mp_init(struct bus *cpu_bus, struct mp_params *p)
{
int num_cpus;
atomic_t *ap_count;
init_bsp(cpu_bus);
if (p == NULL || p->flight_plan == NULL || p->num_records < 1) {
printk(BIOS_CRIT, "Invalid MP parameters\n");
return -1;
}
/* Default to currently running CPU. */
num_cpus = allocate_cpu_devices(cpu_bus, p);
if (num_cpus < p->num_cpus) {
printk(BIOS_CRIT,
"ERROR: More cpus requested (%d) than supported (%d).\n",
p->num_cpus, num_cpus);
return -1;
}
/* Copy needed parameters so that APs have a reference to the plan. */
mp_info.num_records = p->num_records;
mp_info.records = p->flight_plan;
/* Load the SIPI vector. */
ap_count = load_sipi_vector(p);
if (ap_count == NULL)
return -1;
/* Make sure SIPI data hits RAM so the APs that come up will see
* the startup code even if the caches are disabled. */
wbinvd();
/* Start the APs providing number of APs and the cpus_entered field. */
global_num_aps = p->num_cpus - 1;
if (start_aps(cpu_bus, global_num_aps, ap_count) < 0) {
mdelay(1000);
printk(BIOS_DEBUG, "%d/%d eventually checked in?\n",
atomic_read(ap_count), global_num_aps);
return -1;
}
/* Walk the flight plan for the BSP. */
return bsp_do_flight_plan(p);
}
/* Calls cpu_initialize(info->index) which calls the coreboot CPU drivers. */
static void mp_initialize_cpu(void)
{
/* Call back into driver infrastructure for the AP initialization. */
struct cpu_info *info = cpu_info();
cpu_initialize(info->index);
}
void smm_initiate_relocation_parallel(void)
{
if ((lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY)) {
printk(BIOS_DEBUG, "Waiting for ICR not to be busy...");
if (apic_wait_timeout(1000 /* 1 ms */, 50)) {
printk(BIOS_DEBUG, "timed out. Aborting.\n");
return;
}
printk(BIOS_DEBUG, "done.\n");
}
lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(lapicid()));
lapic_write_around(LAPIC_ICR, LAPIC_INT_ASSERT | LAPIC_DM_SMI);
if (apic_wait_timeout(1000 /* 1 ms */, 100 /* us */))
printk(BIOS_DEBUG, "SMI Relocation timed out.\n");
else
printk(BIOS_DEBUG, "Relocation complete.\n");
}
DECLARE_SPIN_LOCK(smm_relocation_lock);
/* Send SMI to self with single user serialization. */
void smm_initiate_relocation(void)
{
spin_lock(&smm_relocation_lock);
smm_initiate_relocation_parallel();
spin_unlock(&smm_relocation_lock);
}
struct mp_state {
struct mp_ops ops;
int cpu_count;
uintptr_t perm_smbase;
size_t perm_smsize;
size_t smm_save_state_size;
int do_smm;
} mp_state;
static int is_smm_enabled(void)
{
return CONFIG(HAVE_SMI_HANDLER) && mp_state.do_smm;
}
static void smm_disable(void)
{
mp_state.do_smm = 0;
}
static void smm_enable(void)
{
if (CONFIG(HAVE_SMI_HANDLER))
mp_state.do_smm = 1;
}
static void asmlinkage smm_do_relocation(void *arg)
{
const struct smm_module_params *p;
const struct smm_runtime *runtime;
int cpu;
uintptr_t curr_smbase;
uintptr_t perm_smbase;
p = arg;
runtime = p->runtime;
cpu = p->cpu;
curr_smbase = runtime->smbase;
if (cpu >= CONFIG_MAX_CPUS) {
printk(BIOS_CRIT,
"Invalid CPU number assigned in SMM stub: %d\n", cpu);
return;
}
/*
* The permanent handler runs with all cpus concurrently. Precalculate
* the location of the new SMBASE. If using SMM modules then this
* calculation needs to match that of the module loader.
*/
perm_smbase = mp_state.perm_smbase;
perm_smbase -= cpu * runtime->save_state_size;
printk(BIOS_DEBUG, "New SMBASE 0x%08lx\n", perm_smbase);
/* Setup code checks this callback for validity. */
mp_state.ops.relocation_handler(cpu, curr_smbase, perm_smbase);
}
static void adjust_smm_apic_id_map(struct smm_loader_params *smm_params)
{
int i;
struct smm_runtime *runtime = smm_params->runtime;
for (i = 0; i < CONFIG_MAX_CPUS; i++)
runtime->apic_id_to_cpu[i] = cpu_get_apic_id(i);
}
static int install_relocation_handler(int num_cpus, size_t save_state_size)
{
struct smm_loader_params smm_params = {
.per_cpu_stack_size = CONFIG_SMM_STUB_STACK_SIZE,
.num_concurrent_stacks = num_cpus,
.per_cpu_save_state_size = save_state_size,
.num_concurrent_save_states = 1,
.handler = smm_do_relocation,
};
/* Allow callback to override parameters. */
if (mp_state.ops.adjust_smm_params != NULL)
mp_state.ops.adjust_smm_params(&smm_params, 0);
if (smm_setup_relocation_handler(&smm_params))
return -1;
adjust_smm_apic_id_map(&smm_params);
return 0;
}
static int install_permanent_handler(int num_cpus, uintptr_t smbase,
size_t smsize, size_t save_state_size)
{
/* There are num_cpus concurrent stacks and num_cpus concurrent save
* state areas. Lastly, set the stack size to 1KiB. */
struct smm_loader_params smm_params = {
.per_cpu_stack_size = CONFIG_SMM_MODULE_STACK_SIZE,
.num_concurrent_stacks = num_cpus,
.per_cpu_save_state_size = save_state_size,
.num_concurrent_save_states = num_cpus,
};
/* Allow callback to override parameters. */
if (mp_state.ops.adjust_smm_params != NULL)
mp_state.ops.adjust_smm_params(&smm_params, 1);
printk(BIOS_DEBUG, "Installing SMM handler to 0x%08lx\n", smbase);
if (smm_load_module((void *)smbase, smsize, &smm_params))
return -1;
adjust_smm_apic_id_map(&smm_params);
return 0;
}
/* Load SMM handlers as part of MP flight record. */
static void load_smm_handlers(void)
{
size_t smm_save_state_size = mp_state.smm_save_state_size;
/* Do nothing if SMM is disabled.*/
if (!is_smm_enabled())
return;
/* Install handlers. */
if (install_relocation_handler(mp_state.cpu_count,
smm_save_state_size) < 0) {
printk(BIOS_ERR, "Unable to install SMM relocation handler.\n");
smm_disable();
}
if (install_permanent_handler(mp_state.cpu_count, mp_state.perm_smbase,
mp_state.perm_smsize, smm_save_state_size) < 0) {
printk(BIOS_ERR, "Unable to install SMM permanent handler.\n");
smm_disable();
}
/* Ensure the SMM handlers hit DRAM before performing first SMI. */
wbinvd();
/*
* Indicate that the SMM handlers have been loaded and MP
* initialization is about to start.
*/
if (is_smm_enabled() && mp_state.ops.pre_mp_smm_init != NULL)
mp_state.ops.pre_mp_smm_init();
}
/* Trigger SMM as part of MP flight record. */
static void trigger_smm_relocation(void)
{
/* Do nothing if SMM is disabled.*/
if (!is_smm_enabled() || mp_state.ops.per_cpu_smm_trigger == NULL)
return;
/* Trigger SMM mode for the currently running processor. */
mp_state.ops.per_cpu_smm_trigger();
}
static struct mp_callback *ap_callbacks[CONFIG_MAX_CPUS];
static struct mp_callback *read_callback(struct mp_callback **slot)
{
struct mp_callback *ret;
asm volatile ("mov %1, %0\n"
: "=r" (ret)
: "m" (*slot)
: "memory"
);
return ret;
}
static void store_callback(struct mp_callback **slot, struct mp_callback *val)
{
asm volatile ("mov %1, %0\n"
: "=m" (*slot)
: "r" (val)
: "memory"
);
}
static int run_ap_work(struct mp_callback *val, long expire_us)
{
int i;
int cpus_accepted;
struct stopwatch sw;
int cur_cpu;
if (!CONFIG(PARALLEL_MP_AP_WORK)) {
printk(BIOS_ERR, "APs already parked. PARALLEL_MP_AP_WORK not selected.\n");
return -1;
}
cur_cpu = cpu_index();
if (cur_cpu < 0) {
printk(BIOS_ERR, "Invalid CPU index.\n");
return -1;
}
/* Signal to all the APs to run the func. */
for (i = 0; i < ARRAY_SIZE(ap_callbacks); i++) {
if (cur_cpu == i)
continue;
store_callback(&ap_callbacks[i], val);
}
mfence();
/* Wait for all the APs to signal back that call has been accepted. */
if (expire_us > 0)
stopwatch_init_usecs_expire(&sw, expire_us);
do {
cpus_accepted = 0;
for (i = 0; i < ARRAY_SIZE(ap_callbacks); i++) {
if (cur_cpu == i)
continue;
if (read_callback(&ap_callbacks[i]) == NULL)
cpus_accepted++;
}
if (cpus_accepted == global_num_aps)
return 0;
} while (expire_us <= 0 || !stopwatch_expired(&sw));
printk(BIOS_CRIT, "CIRTICAL ERROR: AP call expired. %d/%d CPUs accepted.\n",
cpus_accepted, global_num_aps);
return -1;
}
static void ap_wait_for_instruction(void)
{
struct mp_callback lcb;
struct mp_callback **per_cpu_slot;
int cur_cpu;
if (!CONFIG(PARALLEL_MP_AP_WORK))
return;
cur_cpu = cpu_index();
if (cur_cpu < 0) {
printk(BIOS_ERR, "Invalid CPU index.\n");
return;
}
per_cpu_slot = &ap_callbacks[cur_cpu];
while (1) {
struct mp_callback *cb = read_callback(per_cpu_slot);
if (cb == NULL) {
asm ("pause");
continue;
}
/* Copy to local variable before signaling consumption. */
memcpy(&lcb, cb, sizeof(lcb));
mfence();
store_callback(per_cpu_slot, NULL);
if (lcb.logical_cpu_number && (cur_cpu !=
lcb.logical_cpu_number))
continue;
else
lcb.func(lcb.arg);
}
}
int mp_run_on_aps(void (*func)(void *), void *arg, int logical_cpu_num,
long expire_us)
{
struct mp_callback lcb = { .func = func, .arg = arg,
.logical_cpu_number = logical_cpu_num};
return run_ap_work(&lcb, expire_us);
}
int mp_run_on_all_cpus(void (*func)(void *), void *arg)
{
/* Run on BSP first. */
func(arg);
/* For up to 1 second for AP to finish previous work. */
return mp_run_on_aps(func, arg, MP_RUN_ON_ALL_CPUS, 1000 * USECS_PER_MSEC);
}
int mp_park_aps(void)
{
struct stopwatch sw;
int ret;
long duration_msecs;
stopwatch_init(&sw);
ret = mp_run_on_aps(park_this_cpu, NULL, MP_RUN_ON_ALL_CPUS,
1000 * USECS_PER_MSEC);
duration_msecs = stopwatch_duration_msecs(&sw);
if (!ret)
printk(BIOS_DEBUG, "%s done after %ld msecs.\n", __func__,
duration_msecs);
else
printk(BIOS_ERR, "%s failed after %ld msecs.\n", __func__,
duration_msecs);
return ret;
}
static struct mp_flight_record mp_steps[] = {
/* Once the APs are up load the SMM handlers. */
MP_FR_BLOCK_APS(NULL, load_smm_handlers),
/* Perform SMM relocation. */
MP_FR_NOBLOCK_APS(trigger_smm_relocation, trigger_smm_relocation),
/* Initialize each CPU through the driver framework. */
MP_FR_BLOCK_APS(mp_initialize_cpu, mp_initialize_cpu),
/* Wait for APs to finish then optionally start looking for work. */
MP_FR_BLOCK_APS(ap_wait_for_instruction, NULL),
};
static void fill_mp_state(struct mp_state *state, const struct mp_ops *ops)
{
/*
* Make copy of the ops so that defaults can be set in the non-const
* structure if needed.
*/
memcpy(&state->ops, ops, sizeof(*ops));
if (ops->get_cpu_count != NULL)
state->cpu_count = ops->get_cpu_count();
if (ops->get_smm_info != NULL)
ops->get_smm_info(&state->perm_smbase, &state->perm_smsize,
&state->smm_save_state_size);
/*
* Default to smm_initiate_relocation() if trigger callback isn't
* provided.
*/
if (CONFIG(HAVE_SMI_HANDLER) &&
ops->per_cpu_smm_trigger == NULL)
mp_state.ops.per_cpu_smm_trigger = smm_initiate_relocation;
}
int mp_init_with_smm(struct bus *cpu_bus, const struct mp_ops *mp_ops)
{
int ret;
void *default_smm_area;
struct mp_params mp_params;
if (mp_ops->pre_mp_init != NULL)
mp_ops->pre_mp_init();
fill_mp_state(&mp_state, mp_ops);
memset(&mp_params, 0, sizeof(mp_params));
if (mp_state.cpu_count <= 0) {
printk(BIOS_ERR, "Invalid cpu_count: %d\n", mp_state.cpu_count);
return -1;
}
/* Sanity check SMM state. */
if (mp_state.perm_smsize != 0 && mp_state.smm_save_state_size != 0 &&
mp_state.ops.relocation_handler != NULL)
smm_enable();
if (is_smm_enabled())
printk(BIOS_INFO, "Will perform SMM setup.\n");
mp_params.num_cpus = mp_state.cpu_count;
/* Gather microcode information. */
if (mp_state.ops.get_microcode_info != NULL)
mp_state.ops.get_microcode_info(&mp_params.microcode_pointer,
&mp_params.parallel_microcode_load);
mp_params.flight_plan = &mp_steps[0];
mp_params.num_records = ARRAY_SIZE(mp_steps);
/* Perform backup of default SMM area. */
default_smm_area = backup_default_smm_area();
ret = mp_init(cpu_bus, &mp_params);
restore_default_smm_area(default_smm_area);
/* Signal callback on success if it's provided. */
if (ret == 0 && mp_state.ops.post_mp_init != NULL)
mp_state.ops.post_mp_init();
return ret;
}
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