* Rusty Russell : Hacked into shape for new "hotplug" boot process. */
#include <linux/module.h>
-#include <linux/config.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <asm/tlbflush.h>
#include <asm/desc.h>
#include <asm/arch_hooks.h>
+#include <asm/nmi.h>
#include <mach_apic.h>
#include <mach_wakecpu.h>
EXPORT_SYMBOL(smp_num_siblings);
#endif
-/* Package ID of each logical CPU */
-int phys_proc_id[NR_CPUS] __read_mostly = {[0 ... NR_CPUS-1] = BAD_APICID};
-
-/* Core ID of each logical CPU */
-int cpu_core_id[NR_CPUS] __read_mostly = {[0 ... NR_CPUS-1] = BAD_APICID};
-
/* Last level cache ID of each logical CPU */
int cpu_llc_id[NR_CPUS] __cpuinitdata = {[0 ... NR_CPUS-1] = BAD_APICID};
* then we print a warning if not, and always resync.
*/
-static atomic_t tsc_start_flag = ATOMIC_INIT(0);
-static atomic_t tsc_count_start = ATOMIC_INIT(0);
-static atomic_t tsc_count_stop = ATOMIC_INIT(0);
-static unsigned long long tsc_values[NR_CPUS];
+static struct {
+ atomic_t start_flag;
+ atomic_t count_start;
+ atomic_t count_stop;
+ unsigned long long values[NR_CPUS];
+} tsc __initdata = {
+ .start_flag = ATOMIC_INIT(0),
+ .count_start = ATOMIC_INIT(0),
+ .count_stop = ATOMIC_INIT(0),
+};
#define NR_LOOPS 5
-static void __init synchronize_tsc_bp (void)
+static void __init synchronize_tsc_bp(void)
{
int i;
unsigned long long t0;
/* convert from kcyc/sec to cyc/usec */
one_usec = cpu_khz / 1000;
- atomic_set(&tsc_start_flag, 1);
+ atomic_set(&tsc.start_flag, 1);
wmb();
/*
/*
* all APs synchronize but they loop on '== num_cpus'
*/
- while (atomic_read(&tsc_count_start) != num_booting_cpus()-1)
- mb();
- atomic_set(&tsc_count_stop, 0);
+ while (atomic_read(&tsc.count_start) != num_booting_cpus()-1)
+ cpu_relax();
+ atomic_set(&tsc.count_stop, 0);
wmb();
/*
* this lets the APs save their current TSC:
*/
- atomic_inc(&tsc_count_start);
+ atomic_inc(&tsc.count_start);
- rdtscll(tsc_values[smp_processor_id()]);
+ rdtscll(tsc.values[smp_processor_id()]);
/*
* We clear the TSC in the last loop:
*/
/*
* Wait for all APs to leave the synchronization point:
*/
- while (atomic_read(&tsc_count_stop) != num_booting_cpus()-1)
- mb();
- atomic_set(&tsc_count_start, 0);
+ while (atomic_read(&tsc.count_stop) != num_booting_cpus()-1)
+ cpu_relax();
+ atomic_set(&tsc.count_start, 0);
wmb();
- atomic_inc(&tsc_count_stop);
+ atomic_inc(&tsc.count_stop);
}
sum = 0;
for (i = 0; i < NR_CPUS; i++) {
if (cpu_isset(i, cpu_callout_map)) {
- t0 = tsc_values[i];
+ t0 = tsc.values[i];
sum += t0;
}
}
avg = sum;
do_div(avg, num_booting_cpus());
- sum = 0;
for (i = 0; i < NR_CPUS; i++) {
if (!cpu_isset(i, cpu_callout_map))
continue;
- delta = tsc_values[i] - avg;
+ delta = tsc.values[i] - avg;
if (delta < 0)
delta = -delta;
/*
* We report bigger than 2 microseconds clock differences.
*/
if (delta > 2*one_usec) {
- long realdelta;
+ long long realdelta;
+
if (!buggy) {
buggy = 1;
printk("\n");
}
realdelta = delta;
do_div(realdelta, one_usec);
- if (tsc_values[i] < avg)
+ if (tsc.values[i] < avg)
realdelta = -realdelta;
- if (realdelta > 0)
- printk(KERN_INFO "CPU#%d had %ld usecs TSC "
+ if (realdelta)
+ printk(KERN_INFO "CPU#%d had %Ld usecs TSC "
"skew, fixed it up.\n", i, realdelta);
}
-
- sum += delta;
}
if (!buggy)
printk("passed.\n");
}
-static void __init synchronize_tsc_ap (void)
+static void __init synchronize_tsc_ap(void)
{
int i;
* this gets called, so we first wait for the BP to
* finish SMP initialization:
*/
- while (!atomic_read(&tsc_start_flag)) mb();
+ while (!atomic_read(&tsc.start_flag))
+ cpu_relax();
for (i = 0; i < NR_LOOPS; i++) {
- atomic_inc(&tsc_count_start);
- while (atomic_read(&tsc_count_start) != num_booting_cpus())
- mb();
+ atomic_inc(&tsc.count_start);
+ while (atomic_read(&tsc.count_start) != num_booting_cpus())
+ cpu_relax();
- rdtscll(tsc_values[smp_processor_id()]);
+ rdtscll(tsc.values[smp_processor_id()]);
if (i == NR_LOOPS-1)
write_tsc(0, 0);
- atomic_inc(&tsc_count_stop);
- while (atomic_read(&tsc_count_stop) != num_booting_cpus()) mb();
+ atomic_inc(&tsc.count_stop);
+ while (atomic_read(&tsc.count_stop) != num_booting_cpus())
+ cpu_relax();
}
}
#undef NR_LOOPS
struct cpuinfo_x86 *c = cpu_data + cpu;
/*
* For perf, we return last level cache shared map.
- * TBD: when power saving sched policy is added, we will return
- * cpu_core_map when power saving policy is enabled
+ * And for power savings, we return cpu_core_map
*/
- return c->llc_shared_map;
+ if (sched_mc_power_savings || sched_smt_power_savings)
+ return cpu_core_map[cpu];
+ else
+ return c->llc_shared_map;
}
/* representing cpus for which sibling maps can be computed */
if (smp_num_siblings > 1) {
for_each_cpu_mask(i, cpu_sibling_setup_map) {
- if (phys_proc_id[cpu] == phys_proc_id[i] &&
- cpu_core_id[cpu] == cpu_core_id[i]) {
+ if (c[cpu].phys_proc_id == c[i].phys_proc_id &&
+ c[cpu].cpu_core_id == c[i].cpu_core_id) {
cpu_set(i, cpu_sibling_map[cpu]);
cpu_set(cpu, cpu_sibling_map[i]);
cpu_set(i, cpu_core_map[cpu]);
cpu_set(i, c[cpu].llc_shared_map);
cpu_set(cpu, c[i].llc_shared_map);
}
- if (phys_proc_id[cpu] == phys_proc_id[i]) {
+ if (c[cpu].phys_proc_id == c[i].phys_proc_id) {
cpu_set(i, cpu_core_map[cpu]);
cpu_set(cpu, cpu_core_map[i]);
/*
{
int cpu = smp_processor_id();
int apicid = logical_smp_processor_id();
+ int node = apicid_to_node(apicid);
+
+ if (!node_online(node))
+ node = first_online_node;
cpu_2_logical_apicid[cpu] = apicid;
- map_cpu_to_node(cpu, apicid_to_node(apicid));
+ map_cpu_to_node(cpu, node);
}
static void unmap_cpu_to_logical_apicid(int cpu)
static int __cpuinit __smp_prepare_cpu(int cpu)
{
- DECLARE_COMPLETION(done);
+ DECLARE_COMPLETION_ONSTACK(done);
struct warm_boot_cpu_info info;
struct work_struct task;
int apicid, ret;
+ struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, cpu);
apicid = x86_cpu_to_apicid[cpu];
if (apicid == BAD_APICID) {
goto exit;
}
+ /*
+ * the CPU isn't initialized at boot time, allocate gdt table here.
+ * cpu_init will initialize it
+ */
+ if (!cpu_gdt_descr->address) {
+ cpu_gdt_descr->address = get_zeroed_page(GFP_KERNEL);
+ if (!cpu_gdt_descr->address)
+ printk(KERN_CRIT "CPU%d failed to allocate GDT\n", cpu);
+ ret = -ENOMEM;
+ goto exit;
+ }
+
info.complete = &done;
info.apicid = apicid;
info.cpu = cpu;
cpu_clear(cpu, cpu_sibling_map[sibling]);
cpus_clear(cpu_sibling_map[cpu]);
cpus_clear(cpu_core_map[cpu]);
- phys_proc_id[cpu] = BAD_APICID;
- cpu_core_id[cpu] = BAD_APICID;
+ c[cpu].phys_proc_id = 0;
+ c[cpu].cpu_core_id = 0;
cpu_clear(cpu, cpu_sibling_setup_map);
}
/* Unleash the CPU! */
cpu_set(cpu, smp_commenced_mask);
while (!cpu_isset(cpu, cpu_online_map))
- mb();
+ cpu_relax();
return 0;
}
git://git.onelab.eu / linux-2.6.git / blobdiff