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Commit d720803a authored by Li Shaohua's avatar Li Shaohua Committed by Linus Torvalds
Browse files

[PATCH] sibling map initializing rework 



Make sibling map init per-cpu.  Hotplug CPU may change the map at runtime.

Signed-off-by: default avatarLi <Shaohua&lt;shaohua.li@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 6fe940d6

arch/i386/kernel/smpboot.c

+50 −47
Original line number Diff line number Diff line
@@ -66,11 +66,21 @@ int smp_num_siblings = 1; 
#ifdef CONFIG_X86_HT

EXPORT_SYMBOL(smp_num_siblings);

#endif

int phys_proc_id[NR_CPUS]; /* Package ID of each logical CPU */



/* Package ID of each logical CPU */

int phys_proc_id[NR_CPUS] = {[0 ... NR_CPUS-1] = BAD_APICID};

EXPORT_SYMBOL(phys_proc_id);

int cpu_core_id[NR_CPUS]; /* Core ID of each logical CPU */



/* Core ID of each logical CPU */

int cpu_core_id[NR_CPUS] = {[0 ... NR_CPUS-1] = BAD_APICID};

EXPORT_SYMBOL(cpu_core_id);



cpumask_t cpu_sibling_map[NR_CPUS];

EXPORT_SYMBOL(cpu_sibling_map);



cpumask_t cpu_core_map[NR_CPUS];

EXPORT_SYMBOL(cpu_core_map);



/* bitmap of online cpus */

cpumask_t cpu_online_map;

EXPORT_SYMBOL(cpu_online_map);
@@ -423,6 +433,38 @@ static void __init smp_callin(void) 


static int cpucount;



static inline void

set_cpu_sibling_map(int cpu)

{

	int i;



	if (smp_num_siblings > 1) {

		for (i = 0; i < NR_CPUS; i++) {

			if (!cpu_isset(i, cpu_callout_map))

				continue;

			if (cpu_core_id[cpu] == cpu_core_id[i]) {

				cpu_set(i, cpu_sibling_map[cpu]);

				cpu_set(cpu, cpu_sibling_map[i]);

			}

		}

	} else {

		cpu_set(cpu, cpu_sibling_map[cpu]);

	}



	if (current_cpu_data.x86_num_cores > 1) {

		for (i = 0; i < NR_CPUS; i++) {

			if (!cpu_isset(i, cpu_callout_map))

				continue;

			if (phys_proc_id[cpu] == phys_proc_id[i]) {

				cpu_set(i, cpu_core_map[cpu]);

				cpu_set(cpu, cpu_core_map[i]);

			}

		}

	} else {

		cpu_core_map[cpu] = cpu_sibling_map[cpu];

	}

}



/*

 * Activate a secondary processor.

 */
@@ -450,6 +492,10 @@ static void __init start_secondary(void *unused) 
	 */

	local_flush_tlb();



	/* This must be done before setting cpu_online_map */

	set_cpu_sibling_map(raw_smp_processor_id());

	wmb();



	/*

	 * We need to hold call_lock, so there is no inconsistency

	 * between the time smp_call_function() determines number of
@@ -912,13 +958,6 @@ void *xquad_portio; 
EXPORT_SYMBOL(xquad_portio);

#endif



cpumask_t cpu_sibling_map[NR_CPUS] __cacheline_aligned;

#ifdef CONFIG_X86_HT

EXPORT_SYMBOL(cpu_sibling_map);

#endif

cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;

EXPORT_SYMBOL(cpu_core_map);



static void __init smp_boot_cpus(unsigned int max_cpus)

{

	int apicid, cpu, bit, kicked;
@@ -1082,44 +1121,8 @@ static void __init smp_boot_cpus(unsigned int max_cpus) 
		cpus_clear(cpu_core_map[cpu]);

	}



	for (cpu = 0; cpu < NR_CPUS; cpu++) {

		struct cpuinfo_x86 *c = cpu_data + cpu;

		int siblings = 0;

		int i;

		if (!cpu_isset(cpu, cpu_callout_map))

			continue;



		if (smp_num_siblings > 1) {

			for (i = 0; i < NR_CPUS; i++) {

				if (!cpu_isset(i, cpu_callout_map))

					continue;

				if (cpu_core_id[cpu] == cpu_core_id[i]) {

					siblings++;

					cpu_set(i, cpu_sibling_map[cpu]);

				}

			}

		} else {

			siblings++;

			cpu_set(cpu, cpu_sibling_map[cpu]);

		}



		if (siblings != smp_num_siblings) {

			printk(KERN_WARNING "WARNING: %d siblings found for CPU%d, should be %d\n", siblings, cpu, smp_num_siblings);

			smp_num_siblings = siblings;

		}



		if (c->x86_num_cores > 1) {

			for (i = 0; i < NR_CPUS; i++) {

				if (!cpu_isset(i, cpu_callout_map))

					continue;

				if (phys_proc_id[cpu] == phys_proc_id[i]) {

					cpu_set(i, cpu_core_map[cpu]);

				}

			}

		} else {

			cpu_core_map[cpu] = cpu_sibling_map[cpu];

		}

	}

	cpu_set(0, cpu_sibling_map[0]);

	cpu_set(0, cpu_core_map[0]);



	smpboot_setup_io_apic();