/* State of each CPU */
DEFINE_PER_CPU(int, cpu_state) = { 0 };
-/* Store all idle threads, this can be reused instead of creating
-* a new thread. Also avoids complicated thread destroy functionality
-* for idle threads.
-*/
#ifdef CONFIG_HOTPLUG_CPU
-/*
- * Needed only for CONFIG_HOTPLUG_CPU because __cpuinitdata is
- * removed after init for !CONFIG_HOTPLUG_CPU.
- */
-static DEFINE_PER_CPU(struct task_struct *, idle_thread_array);
-#define get_idle_for_cpu(x) (per_cpu(idle_thread_array, x))
-#define set_idle_for_cpu(x, p) (per_cpu(idle_thread_array, x) = (p))
-
/*
* We need this for trampoline_base protection from concurrent accesses when
* off- and onlining cores wildly.
void cpu_hotplug_driver_lock(void)
{
- mutex_lock(&x86_cpu_hotplug_driver_mutex);
+ mutex_lock(&x86_cpu_hotplug_driver_mutex);
}
void cpu_hotplug_driver_unlock(void)
{
- mutex_unlock(&x86_cpu_hotplug_driver_mutex);
+ mutex_unlock(&x86_cpu_hotplug_driver_mutex);
}
ssize_t arch_cpu_probe(const char *buf, size_t count) { return -1; }
ssize_t arch_cpu_release(const char *buf, size_t count) { return -1; }
-#else
-static struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
-#define get_idle_for_cpu(x) (idle_thread_array[(x)])
-#define set_idle_for_cpu(x, p) (idle_thread_array[(x)] = (p))
#endif
/* Number of siblings per CPU package */
identify_secondary_cpu(c);
}
-static void __cpuinit link_thread_siblings(int cpu1, int cpu2)
+static bool __cpuinit
+topology_sane(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o, const char *name)
{
- cpumask_set_cpu(cpu1, cpu_sibling_mask(cpu2));
- cpumask_set_cpu(cpu2, cpu_sibling_mask(cpu1));
- cpumask_set_cpu(cpu1, cpu_core_mask(cpu2));
- cpumask_set_cpu(cpu2, cpu_core_mask(cpu1));
- cpumask_set_cpu(cpu1, cpu_llc_shared_mask(cpu2));
- cpumask_set_cpu(cpu2, cpu_llc_shared_mask(cpu1));
+ int cpu1 = c->cpu_index, cpu2 = o->cpu_index;
+
+ return !WARN_ONCE(cpu_to_node(cpu1) != cpu_to_node(cpu2),
+ "sched: CPU #%d's %s-sibling CPU #%d is not on the same node! "
+ "[node: %d != %d]. Ignoring dependency.\n",
+ cpu1, name, cpu2, cpu_to_node(cpu1), cpu_to_node(cpu2));
}
+#define link_mask(_m, c1, c2) \
+do { \
+ cpumask_set_cpu((c1), cpu_##_m##_mask(c2)); \
+ cpumask_set_cpu((c2), cpu_##_m##_mask(c1)); \
+} while (0)
+
+static bool __cpuinit match_smt(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
+{
+ if (cpu_has(c, X86_FEATURE_TOPOEXT)) {
+ int cpu1 = c->cpu_index, cpu2 = o->cpu_index;
+
+ if (c->phys_proc_id == o->phys_proc_id &&
+ per_cpu(cpu_llc_id, cpu1) == per_cpu(cpu_llc_id, cpu2) &&
+ c->compute_unit_id == o->compute_unit_id)
+ return topology_sane(c, o, "smt");
+
+ } else if (c->phys_proc_id == o->phys_proc_id &&
+ c->cpu_core_id == o->cpu_core_id) {
+ return topology_sane(c, o, "smt");
+ }
+
+ return false;
+}
+
+static bool __cpuinit match_llc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
+{
+ int cpu1 = c->cpu_index, cpu2 = o->cpu_index;
+
+ if (per_cpu(cpu_llc_id, cpu1) != BAD_APICID &&
+ per_cpu(cpu_llc_id, cpu1) == per_cpu(cpu_llc_id, cpu2))
+ return topology_sane(c, o, "llc");
+
+ return false;
+}
+
+static bool __cpuinit match_mc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
+{
+ if (c->phys_proc_id == o->phys_proc_id)
+ return topology_sane(c, o, "mc");
+
+ return false;
+}
void __cpuinit set_cpu_sibling_map(int cpu)
{
- int i;
+ bool has_mc = boot_cpu_data.x86_max_cores > 1;
+ bool has_smt = smp_num_siblings > 1;
struct cpuinfo_x86 *c = &cpu_data(cpu);
+ struct cpuinfo_x86 *o;
+ int i;
cpumask_set_cpu(cpu, cpu_sibling_setup_mask);
- if (smp_num_siblings > 1) {
- for_each_cpu(i, cpu_sibling_setup_mask) {
- struct cpuinfo_x86 *o = &cpu_data(i);
-
- if (cpu_has(c, X86_FEATURE_TOPOEXT)) {
- if (c->phys_proc_id == o->phys_proc_id &&
- per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i) &&
- c->compute_unit_id == o->compute_unit_id)
- link_thread_siblings(cpu, i);
- } else if (c->phys_proc_id == o->phys_proc_id &&
- c->cpu_core_id == o->cpu_core_id) {
- link_thread_siblings(cpu, i);
- }
- }
- } else {
+ if (!has_smt && !has_mc) {
cpumask_set_cpu(cpu, cpu_sibling_mask(cpu));
- }
-
- cpumask_set_cpu(cpu, cpu_llc_shared_mask(cpu));
-
- if (__this_cpu_read(cpu_info.x86_max_cores) == 1) {
- cpumask_copy(cpu_core_mask(cpu), cpu_sibling_mask(cpu));
+ cpumask_set_cpu(cpu, cpu_llc_shared_mask(cpu));
+ cpumask_set_cpu(cpu, cpu_core_mask(cpu));
c->booted_cores = 1;
return;
}
for_each_cpu(i, cpu_sibling_setup_mask) {
- if (per_cpu(cpu_llc_id, cpu) != BAD_APICID &&
- per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i)) {
- cpumask_set_cpu(i, cpu_llc_shared_mask(cpu));
- cpumask_set_cpu(cpu, cpu_llc_shared_mask(i));
- }
- if (c->phys_proc_id == cpu_data(i).phys_proc_id) {
- cpumask_set_cpu(i, cpu_core_mask(cpu));
- cpumask_set_cpu(cpu, cpu_core_mask(i));
+ o = &cpu_data(i);
+
+ if ((i == cpu) || (has_smt && match_smt(c, o)))
+ link_mask(sibling, cpu, i);
+
+ if ((i == cpu) || (has_mc && match_llc(c, o)))
+ link_mask(llc_shared, cpu, i);
+
+ if ((i == cpu) || (has_mc && match_mc(c, o))) {
+ link_mask(core, cpu, i);
+
/*
* Does this new cpu bringup a new core?
*/
* For perf, we return last level cache shared map.
* And for power savings, we return cpu_core_map
*/
- if ((sched_mc_power_savings || sched_smt_power_savings) &&
- !(cpu_has(c, X86_FEATURE_AMD_DCM)))
+ if (!(cpu_has(c, X86_FEATURE_AMD_DCM)))
return cpu_core_mask(cpu);
else
return cpu_llc_shared_mask(cpu);
return (send_status | accept_status);
}
-struct create_idle {
- struct work_struct work;
- struct task_struct *idle;
- struct completion done;
- int cpu;
-};
-
-static void __cpuinit do_fork_idle(struct work_struct *work)
-{
- struct create_idle *c_idle =
- container_of(work, struct create_idle, work);
-
- c_idle->idle = fork_idle(c_idle->cpu);
- complete(&c_idle->done);
-}
-
/* reduce the number of lines printed when booting a large cpu count system */
static void __cpuinit announce_cpu(int cpu, int apicid)
{
* Returns zero if CPU booted OK, else error code from
* ->wakeup_secondary_cpu.
*/
-static int __cpuinit do_boot_cpu(int apicid, int cpu)
+static int __cpuinit do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
{
volatile u32 *trampoline_status =
(volatile u32 *) __va(real_mode_header->trampoline_status);
unsigned long boot_error = 0;
int timeout;
- struct create_idle c_idle = {
- .cpu = cpu,
- .done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
- };
-
- INIT_WORK_ONSTACK(&c_idle.work, do_fork_idle);
alternatives_smp_switch(1);
- c_idle.idle = get_idle_for_cpu(cpu);
-
- /*
- * We can't use kernel_thread since we must avoid to
- * reschedule the child.
- */
- if (c_idle.idle) {
- c_idle.idle->thread.sp = (unsigned long) (((struct pt_regs *)
- (THREAD_SIZE + task_stack_page(c_idle.idle))) - 1);
- init_idle(c_idle.idle, cpu);
- goto do_rest;
- }
-
- schedule_work(&c_idle.work);
- wait_for_completion(&c_idle.done);
+ idle->thread.sp = (unsigned long) (((struct pt_regs *)
+ (THREAD_SIZE + task_stack_page(idle))) - 1);
+ per_cpu(current_task, cpu) = idle;
- if (IS_ERR(c_idle.idle)) {
- printk("failed fork for CPU %d\n", cpu);
- destroy_work_on_stack(&c_idle.work);
- return PTR_ERR(c_idle.idle);
- }
-
- set_idle_for_cpu(cpu, c_idle.idle);
-do_rest:
- per_cpu(current_task, cpu) = c_idle.idle;
#ifdef CONFIG_X86_32
/* Stack for startup_32 can be just as for start_secondary onwards */
irq_ctx_init(cpu);
#else
- clear_tsk_thread_flag(c_idle.idle, TIF_FORK);
+ clear_tsk_thread_flag(idle, TIF_FORK);
initial_gs = per_cpu_offset(cpu);
per_cpu(kernel_stack, cpu) =
- (unsigned long)task_stack_page(c_idle.idle) -
+ (unsigned long)task_stack_page(idle) -
KERNEL_STACK_OFFSET + THREAD_SIZE;
#endif
early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
initial_code = (unsigned long)start_secondary;
- stack_start = c_idle.idle->thread.sp;
+ stack_start = idle->thread.sp;
/* So we see what's up */
announce_cpu(cpu, apicid);
*/
smpboot_restore_warm_reset_vector();
}
-
- destroy_work_on_stack(&c_idle.work);
return boot_error;
}
-int __cpuinit native_cpu_up(unsigned int cpu)
+int __cpuinit native_cpu_up(unsigned int cpu, struct task_struct *tidle)
{
int apicid = apic->cpu_present_to_apicid(cpu);
unsigned long flags;
per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
- err = do_boot_cpu(apicid, cpu);
+ err = do_boot_cpu(apicid, cpu, tidle);
if (err) {
pr_debug("do_boot_cpu failed %d\n", err);
return -EIO;
projects / cascardo / linux.git / blobdiff