[linux-2.6-block.git] / arch / arm64 / kernel / topology.c

/*
 * arch/arm64/kernel/topology.c
 *
 * Copyright (C) 2011,2013,2014 Linaro Limited.
 *
 * Based on the arm32 version written by Vincent Guittot in turn based on
 * arch/sh/kernel/topology.c
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/acpi.h>
#include <linux/arch_topology.h>
#include <linux/cacheinfo.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/percpu.h>
#include <linux/node.h>
#include <linux/nodemask.h>
#include <linux/of.h>
#include <linux/sched.h>
#include <linux/sched/topology.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/string.h>

#include <asm/cpu.h>
#include <asm/cputype.h>
#include <asm/topology.h>

static int __init get_cpu_for_node(struct device_node *node)
{
	struct device_node *cpu_node;
	int cpu;

	cpu_node = of_parse_phandle(node, "cpu", 0);
	if (!cpu_node)
		return -1;

	cpu = of_cpu_node_to_id(cpu_node);
	if (cpu >= 0)
		topology_parse_cpu_capacity(cpu_node, cpu);
	else
		pr_crit("Unable to find CPU node for %pOF\n", cpu_node);

	of_node_put(cpu_node);
	return cpu;
}

static int __init parse_core(struct device_node *core, int package_id,
			     int core_id)
{
	char name[10];
	bool leaf = true;
	int i = 0;
	int cpu;
	struct device_node *t;

	do {
		snprintf(name, sizeof(name), "thread%d", i);
		t = of_get_child_by_name(core, name);
		if (t) {
			leaf = false;
			cpu = get_cpu_for_node(t);
			if (cpu >= 0) {
				cpu_topology[cpu].package_id = package_id;
				cpu_topology[cpu].core_id = core_id;
				cpu_topology[cpu].thread_id = i;
			} else {
				pr_err("%pOF: Can't get CPU for thread\n",
				       t);
				of_node_put(t);
				return -EINVAL;
			}
			of_node_put(t);
		}
		i++;
	} while (t);

	cpu = get_cpu_for_node(core);
	if (cpu >= 0) {
		if (!leaf) {
			pr_err("%pOF: Core has both threads and CPU\n",
			       core);
			return -EINVAL;
		}

		cpu_topology[cpu].package_id = package_id;
		cpu_topology[cpu].core_id = core_id;
	} else if (leaf) {
		pr_err("%pOF: Can't get CPU for leaf core\n", core);
		return -EINVAL;
	}

	return 0;
}

static int __init parse_cluster(struct device_node *cluster, int depth)
{
	char name[10];
	bool leaf = true;
	bool has_cores = false;
	struct device_node *c;
	static int package_id __initdata;
	int core_id = 0;
	int i, ret;

	/*
	 * First check for child clusters; we currently ignore any
	 * information about the nesting of clusters and present the
	 * scheduler with a flat list of them.
	 */
	i = 0;
	do {
		snprintf(name, sizeof(name), "cluster%d", i);
		c = of_get_child_by_name(cluster, name);
		if (c) {
			leaf = false;
			ret = parse_cluster(c, depth + 1);
			of_node_put(c);
			if (ret != 0)
				return ret;
		}
		i++;
	} while (c);

	/* Now check for cores */
	i = 0;
	do {
		snprintf(name, sizeof(name), "core%d", i);
		c = of_get_child_by_name(cluster, name);
		if (c) {
			has_cores = true;

			if (depth == 0) {
				pr_err("%pOF: cpu-map children should be clusters\n",
				       c);
				of_node_put(c);
				return -EINVAL;
			}

			if (leaf) {
				ret = parse_core(c, package_id, core_id++);
			} else {
				pr_err("%pOF: Non-leaf cluster with core %s\n",
				       cluster, name);
				ret = -EINVAL;
			}

			of_node_put(c);
			if (ret != 0)
				return ret;
		}
		i++;
	} while (c);

	if (leaf && !has_cores)
		pr_warn("%pOF: empty cluster\n", cluster);

	if (leaf)
		package_id++;

	return 0;
}

static int __init parse_dt_topology(void)
{
	struct device_node *cn, *map;
	int ret = 0;
	int cpu;

	cn = of_find_node_by_path("/cpus");
	if (!cn) {
		pr_err("No CPU information found in DT\n");
		return 0;
	}

	/*
	 * When topology is provided cpu-map is essentially a root
	 * cluster with restricted subnodes.
	 */
	map = of_get_child_by_name(cn, "cpu-map");
	if (!map)
		goto out;

	ret = parse_cluster(map, 0);
	if (ret != 0)
		goto out_map;

	topology_normalize_cpu_scale();

	/*
	 * Check that all cores are in the topology; the SMP code will
	 * only mark cores described in the DT as possible.
	 */
	for_each_possible_cpu(cpu)
		if (cpu_topology[cpu].package_id == -1)
			ret = -EINVAL;

out_map:
	of_node_put(map);
out:
	of_node_put(cn);
	return ret;
}

/*
 * cpu topology table
 */
struct cpu_topology cpu_topology[NR_CPUS];
EXPORT_SYMBOL_GPL(cpu_topology);

const struct cpumask *cpu_coregroup_mask(int cpu)
{
	const cpumask_t *core_mask = cpumask_of_node(cpu_to_node(cpu));

	/* Find the smaller of NUMA, core or LLC siblings */
	if (cpumask_subset(&cpu_topology[cpu].core_sibling, core_mask)) {
		/* not numa in package, lets use the package siblings */
		core_mask = &cpu_topology[cpu].core_sibling;
	}
	if (cpu_topology[cpu].llc_id != -1) {
		if (cpumask_subset(&cpu_topology[cpu].llc_sibling, core_mask))
			core_mask = &cpu_topology[cpu].llc_sibling;
	}

	return core_mask;
}

static void update_siblings_masks(unsigned int cpuid)
{
	struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
	int cpu;

	/* update core and thread sibling masks */
	for_each_online_cpu(cpu) {
		cpu_topo = &cpu_topology[cpu];

		if (cpuid_topo->llc_id == cpu_topo->llc_id) {
			cpumask_set_cpu(cpu, &cpuid_topo->llc_sibling);
			cpumask_set_cpu(cpuid, &cpu_topo->llc_sibling);
		}

		if (cpuid_topo->package_id != cpu_topo->package_id)
			continue;

		cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
		cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);

		if (cpuid_topo->core_id != cpu_topo->core_id)
			continue;

		cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
		cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
	}
}

void store_cpu_topology(unsigned int cpuid)
{
	struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
	u64 mpidr;

	if (cpuid_topo->package_id != -1)
		goto topology_populated;

	mpidr = read_cpuid_mpidr();

	/* Uniprocessor systems can rely on default topology values */
	if (mpidr & MPIDR_UP_BITMASK)
		return;

	/* Create cpu topology mapping based on MPIDR. */
	if (mpidr & MPIDR_MT_BITMASK) {
		/* Multiprocessor system : Multi-threads per core */
		cpuid_topo->thread_id  = MPIDR_AFFINITY_LEVEL(mpidr, 0);
		cpuid_topo->core_id    = MPIDR_AFFINITY_LEVEL(mpidr, 1);
		cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 2) |
					 MPIDR_AFFINITY_LEVEL(mpidr, 3) << 8;
	} else {
		/* Multiprocessor system : Single-thread per core */
		cpuid_topo->thread_id  = -1;
		cpuid_topo->core_id    = MPIDR_AFFINITY_LEVEL(mpidr, 0);
		cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 1) |
					 MPIDR_AFFINITY_LEVEL(mpidr, 2) << 8 |
					 MPIDR_AFFINITY_LEVEL(mpidr, 3) << 16;
	}

	pr_debug("CPU%u: cluster %d core %d thread %d mpidr %#016llx\n",
		 cpuid, cpuid_topo->package_id, cpuid_topo->core_id,
		 cpuid_topo->thread_id, mpidr);

topology_populated:
	update_siblings_masks(cpuid);
}

static void clear_cpu_topology(int cpu)
{
	struct cpu_topology *cpu_topo = &cpu_topology[cpu];

	cpumask_clear(&cpu_topo->llc_sibling);
	cpumask_set_cpu(cpu, &cpu_topo->llc_sibling);

	cpumask_clear(&cpu_topo->core_sibling);
	cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
	cpumask_clear(&cpu_topo->thread_sibling);
	cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
}

static void __init reset_cpu_topology(void)
{
	unsigned int cpu;

	for_each_possible_cpu(cpu) {
		struct cpu_topology *cpu_topo = &cpu_topology[cpu];

		cpu_topo->thread_id = -1;
		cpu_topo->core_id = 0;
		cpu_topo->package_id = -1;
		cpu_topo->llc_id = -1;

		clear_cpu_topology(cpu);
	}
}

void remove_cpu_topology(unsigned int cpu)
{
	int sibling;

	for_each_cpu(sibling, topology_core_cpumask(cpu))
		cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
	for_each_cpu(sibling, topology_sibling_cpumask(cpu))
		cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
	for_each_cpu(sibling, topology_llc_cpumask(cpu))
		cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling));

	clear_cpu_topology(cpu);
}

#ifdef CONFIG_ACPI
/*
 * Propagate the topology information of the processor_topology_node tree to the
 * cpu_topology array.
 */
static int __init parse_acpi_topology(void)
{
	bool is_threaded;
	int cpu, topology_id;

	is_threaded = read_cpuid_mpidr() & MPIDR_MT_BITMASK;

	for_each_possible_cpu(cpu) {
		int i, cache_id;

		topology_id = find_acpi_cpu_topology(cpu, 0);
		if (topology_id < 0)
			return topology_id;

		if (is_threaded) {
			cpu_topology[cpu].thread_id = topology_id;
			topology_id = find_acpi_cpu_topology(cpu, 1);
			cpu_topology[cpu].core_id   = topology_id;
		} else {
			cpu_topology[cpu].thread_id  = -1;
			cpu_topology[cpu].core_id    = topology_id;
		}
		topology_id = find_acpi_cpu_topology_package(cpu);
		cpu_topology[cpu].package_id = topology_id;

		i = acpi_find_last_cache_level(cpu);

		if (i > 0) {
			/*
			 * this is the only part of cpu_topology that has
			 * a direct relationship with the cache topology
			 */
			cache_id = find_acpi_cpu_cache_topology(cpu, i);
			if (cache_id > 0)
				cpu_topology[cpu].llc_id = cache_id;
		}
	}

	return 0;
}

#else
static inline int __init parse_acpi_topology(void)
{
	return -EINVAL;
}
#endif

void __init init_cpu_topology(void)
{
	reset_cpu_topology();

	/*
	 * Discard anything that was parsed if we hit an error so we
	 * don't use partial information.
	 */
	if (!acpi_disabled && parse_acpi_topology())
		reset_cpu_topology();
	else if (of_have_populated_dt() && parse_dt_topology())
		reset_cpu_topology();
}
Commit	Line	Data
f6e763b9 MB	1	/*
	2	* arch/arm64/kernel/topology.c
	3	*
	4	* Copyright (C) 2011,2013,2014 Linaro Limited.
	5	*
	6	* Based on the arm32 version written by Vincent Guittot in turn based on
	7	* arch/sh/kernel/topology.c
	8	*
	9	* This file is subject to the terms and conditions of the GNU General Public
	10	* License. See the file "COPYING" in the main directory of this archive
	11	* for more details.
	12	*/
	13
2f0a5d10	14	#include <linux/acpi.h>
615ffd63	15	#include <linux/arch_topology.h>
37c3ec2d	16	#include <linux/cacheinfo.h>
f6e763b9 MB	17	#include <linux/cpu.h>
	18	#include <linux/cpumask.h>
	19	#include <linux/init.h>
	20	#include <linux/percpu.h>
	21	#include <linux/node.h>
	22	#include <linux/nodemask.h>
ebdc9447	23	#include <linux/of.h>
f6e763b9	24	#include <linux/sched.h>
105ab3d8	25	#include <linux/sched/topology.h>
7202bde8	26	#include <linux/slab.h>
2f0a5d10	27	#include <linux/smp.h>
be8f185d	28	#include <linux/string.h>
f6e763b9	29
be8f185d	30	#include <asm/cpu.h>
4e6f7084	31	#include <asm/cputype.h>
f6e763b9 MB	32	#include <asm/topology.h>
f6e763b9 MB	33
ebdc9447 MB	34	static int __init get_cpu_for_node(struct device_node *node)
	35	{
	36	struct device_node *cpu_node;
	37	int cpu;
	38
	39	cpu_node = of_parse_phandle(node, "cpu", 0);
	40	if (!cpu_node)
	41	return -1;
	42
52cac110 SP	43	cpu = of_cpu_node_to_id(cpu_node);
	44	if (cpu >= 0)
	45	topology_parse_cpu_capacity(cpu_node, cpu);
	46	else
	47	pr_crit("Unable to find CPU node for %pOF\n", cpu_node);
ebdc9447 MB	48
ebdc9447 MB	49	of_node_put(cpu_node);
52cac110	50	return cpu;
ebdc9447 MB	51	}
ebdc9447 MB	52
868abc07	53	static int __init parse_core(struct device_node *core, int package_id,
ebdc9447 MB	54	int core_id)
	55	{
	56	char name[10];
	57	bool leaf = true;
	58	int i = 0;
	59	int cpu;
	60	struct device_node *t;
	61
	62	do {
	63	snprintf(name, sizeof(name), "thread%d", i);
	64	t = of_get_child_by_name(core, name);
	65	if (t) {
	66	leaf = false;
	67	cpu = get_cpu_for_node(t);
	68	if (cpu >= 0) {
868abc07	69	cpu_topology[cpu].package_id = package_id;
ebdc9447 MB	70	cpu_topology[cpu].core_id = core_id;
	71	cpu_topology[cpu].thread_id = i;
	72	} else {
a270f327 RH	73	pr_err("%pOF: Can't get CPU for thread\n",
a270f327 RH	74	t);
ebdc9447 MB	75	of_node_put(t);
	76	return -EINVAL;
	77	}
	78	of_node_put(t);
	79	}
	80	i++;
	81	} while (t);
	82
	83	cpu = get_cpu_for_node(core);
	84	if (cpu >= 0) {
	85	if (!leaf) {
a270f327 RH	86	pr_err("%pOF: Core has both threads and CPU\n",
a270f327 RH	87	core);
ebdc9447 MB	88	return -EINVAL;
	89	}
	90
868abc07	91	cpu_topology[cpu].package_id = package_id;
ebdc9447 MB	92	cpu_topology[cpu].core_id = core_id;
ebdc9447 MB	93	} else if (leaf) {
a270f327	94	pr_err("%pOF: Can't get CPU for leaf core\n", core);
ebdc9447 MB	95	return -EINVAL;
	96	}
	97
	98	return 0;
	99	}
	100
	101	static int __init parse_cluster(struct device_node *cluster, int depth)
	102	{
	103	char name[10];
	104	bool leaf = true;
	105	bool has_cores = false;
	106	struct device_node *c;
868abc07	107	static int package_id __initdata;
ebdc9447 MB	108	int core_id = 0;
	109	int i, ret;
	110
	111	/*
	112	* First check for child clusters; we currently ignore any
	113	* information about the nesting of clusters and present the
	114	* scheduler with a flat list of them.
	115	*/
	116	i = 0;
	117	do {
	118	snprintf(name, sizeof(name), "cluster%d", i);
	119	c = of_get_child_by_name(cluster, name);
	120	if (c) {
	121	leaf = false;
	122	ret = parse_cluster(c, depth + 1);
	123	of_node_put(c);
	124	if (ret != 0)
	125	return ret;
	126	}
	127	i++;
	128	} while (c);
	129
	130	/* Now check for cores */
	131	i = 0;
	132	do {
	133	snprintf(name, sizeof(name), "core%d", i);
	134	c = of_get_child_by_name(cluster, name);
	135	if (c) {
	136	has_cores = true;
	137
	138	if (depth == 0) {
a270f327 RH	139	pr_err("%pOF: cpu-map children should be clusters\n",
a270f327 RH	140	c);
ebdc9447 MB	141	of_node_put(c);
	142	return -EINVAL;
	143	}
	144
	145	if (leaf) {
868abc07	146	ret = parse_core(c, package_id, core_id++);
ebdc9447	147	} else {
a270f327 RH	148	pr_err("%pOF: Non-leaf cluster with core %s\n",
a270f327 RH	149	cluster, name);
ebdc9447 MB	150	ret = -EINVAL;
	151	}
	152
	153	of_node_put(c);
	154	if (ret != 0)
	155	return ret;
	156	}
	157	i++;
	158	} while (c);
	159
	160	if (leaf && !has_cores)
a270f327	161	pr_warn("%pOF: empty cluster\n", cluster);
ebdc9447 MB	162
ebdc9447 MB	163	if (leaf)
868abc07	164	package_id++;
ebdc9447 MB	165
	166	return 0;
	167	}
	168
	169	static int __init parse_dt_topology(void)
	170	{
	171	struct device_node cn, map;
	172	int ret = 0;
	173	int cpu;
	174
	175	cn = of_find_node_by_path("/cpus");
	176	if (!cn) {
	177	pr_err("No CPU information found in DT\n");
	178	return 0;
	179	}
	180
	181	/*
	182	* When topology is provided cpu-map is essentially a root
	183	* cluster with restricted subnodes.
	184	*/
	185	map = of_get_child_by_name(cn, "cpu-map");
c105aa31	186	if (!map)
ebdc9447 MB	187	goto out;
	188
	189	ret = parse_cluster(map, 0);
	190	if (ret != 0)
	191	goto out_map;
	192
4ca4f26a	193	topology_normalize_cpu_scale();
7202bde8	194
ebdc9447 MB	195	/*
	196	* Check that all cores are in the topology; the SMP code will
	197	* only mark cores described in the DT as possible.
	198	*/
4e6f7084	199	for_each_possible_cpu(cpu)
868abc07	200	if (cpu_topology[cpu].package_id == -1)
ebdc9447	201	ret = -EINVAL;
ebdc9447 MB	202
	203	out_map:
	204	of_node_put(map);
	205	out:
	206	of_node_put(cn);
	207	return ret;
	208	}
	209
f6e763b9 MB	210	/*
	211	* cpu topology table
	212	*/
	213	struct cpu_topology cpu_topology[NR_CPUS];
	214	EXPORT_SYMBOL_GPL(cpu_topology);
	215
	216	const struct cpumask *cpu_coregroup_mask(int cpu)
	217	{
e67ecf64	218	const cpumask_t *core_mask = cpumask_of_node(cpu_to_node(cpu));
37c3ec2d	219
e67ecf64 SH	220	/* Find the smaller of NUMA, core or LLC siblings */
	221	if (cpumask_subset(&cpu_topology[cpu].core_sibling, core_mask)) {
	222	/* not numa in package, lets use the package siblings */
	223	core_mask = &cpu_topology[cpu].core_sibling;
	224	}
37c3ec2d	225	if (cpu_topology[cpu].llc_id != -1) {
f70ff127 SH	226	if (cpumask_subset(&cpu_topology[cpu].llc_sibling, core_mask))
f70ff127 SH	227	core_mask = &cpu_topology[cpu].llc_sibling;
37c3ec2d JL	228	}
	229
	230	return core_mask;
f6e763b9 MB	231	}
	232
	233	static void update_siblings_masks(unsigned int cpuid)
	234	{
	235	struct cpu_topology cpu_topo, cpuid_topo = &cpu_topology[cpuid];
	236	int cpu;
	237
f6e763b9	238	/* update core and thread sibling masks */
5ec8b591	239	for_each_online_cpu(cpu) {
f6e763b9 MB	240	cpu_topo = &cpu_topology[cpu];
f6e763b9 MB	241
e156ab71	242	if (cpuid_topo->llc_id == cpu_topo->llc_id) {
f70ff127 SH	243	cpumask_set_cpu(cpu, &cpuid_topo->llc_sibling);
f70ff127 SH	244	cpumask_set_cpu(cpuid, &cpu_topo->llc_sibling);
e156ab71	245	}
37c3ec2d	246
868abc07	247	if (cpuid_topo->package_id != cpu_topo->package_id)
f6e763b9 MB	248	continue;
	249
	250	cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
5ec8b591	251	cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
f6e763b9 MB	252
	253	if (cpuid_topo->core_id != cpu_topo->core_id)
	254	continue;
	255
	256	cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
5ec8b591	257	cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
f6e763b9 MB	258	}
	259	}
	260
	261	void store_cpu_topology(unsigned int cpuid)
	262	{
4e6f7084 ZSL	263	struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
	264	u64 mpidr;
	265
868abc07	266	if (cpuid_topo->package_id != -1)
4e6f7084 ZSL	267	goto topology_populated;
	268
	269	mpidr = read_cpuid_mpidr();
	270
	271	/* Uniprocessor systems can rely on default topology values */
	272	if (mpidr & MPIDR_UP_BITMASK)
	273	return;
	274
	275	/* Create cpu topology mapping based on MPIDR. */
	276	if (mpidr & MPIDR_MT_BITMASK) {
	277	/* Multiprocessor system : Multi-threads per core */
	278	cpuid_topo->thread_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
	279	cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
868abc07	280	cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 2) \|
1cefdaea	281	MPIDR_AFFINITY_LEVEL(mpidr, 3) << 8;
4e6f7084 ZSL	282	} else {
	283	/* Multiprocessor system : Single-thread per core */
	284	cpuid_topo->thread_id = -1;
	285	cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
868abc07	286	cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 1) \|
1cefdaea MB	287	MPIDR_AFFINITY_LEVEL(mpidr, 2) << 8 \|
1cefdaea MB	288	MPIDR_AFFINITY_LEVEL(mpidr, 3) << 16;
4e6f7084 ZSL	289	}
	290
	291	pr_debug("CPU%u: cluster %d core %d thread %d mpidr %#016llx\n",
868abc07	292	cpuid, cpuid_topo->package_id, cpuid_topo->core_id,
4e6f7084 ZSL	293	cpuid_topo->thread_id, mpidr);
	294
	295	topology_populated:
f6e763b9 MB	296	update_siblings_masks(cpuid);
	297	}
	298
31b46035 SH	299	static void clear_cpu_topology(int cpu)
	300	{
	301	struct cpu_topology *cpu_topo = &cpu_topology[cpu];
	302
f70ff127 SH	303	cpumask_clear(&cpu_topo->llc_sibling);
f70ff127 SH	304	cpumask_set_cpu(cpu, &cpu_topo->llc_sibling);
31b46035 SH	305
	306	cpumask_clear(&cpu_topo->core_sibling);
	307	cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
	308	cpumask_clear(&cpu_topo->thread_sibling);
	309	cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
	310	}
	311
ebdc9447	312	static void __init reset_cpu_topology(void)
f6e763b9 MB	313	{
	314	unsigned int cpu;
	315
f6e763b9 MB	316	for_each_possible_cpu(cpu) {
	317	struct cpu_topology *cpu_topo = &cpu_topology[cpu];
	318
	319	cpu_topo->thread_id = -1;
c31bf048	320	cpu_topo->core_id = 0;
868abc07	321	cpu_topo->package_id = -1;
37c3ec2d	322	cpu_topo->llc_id = -1;
37c3ec2d	323
31b46035	324	clear_cpu_topology(cpu);
f6e763b9 MB	325	}
f6e763b9 MB	326	}
ebdc9447	327
5bdd2b3f SH	328	void remove_cpu_topology(unsigned int cpu)
	329	{
	330	int sibling;
	331
	332	for_each_cpu(sibling, topology_core_cpumask(cpu))
	333	cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
	334	for_each_cpu(sibling, topology_sibling_cpumask(cpu))
	335	cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
	336	for_each_cpu(sibling, topology_llc_cpumask(cpu))
	337	cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling));
	338
	339	clear_cpu_topology(cpu);
	340	}
	341
2f0a5d10 JL	342	#ifdef CONFIG_ACPI
	343	/*
	344	* Propagate the topology information of the processor_topology_node tree to the
	345	* cpu_topology array.
	346	*/
	347	static int __init parse_acpi_topology(void)
	348	{
	349	bool is_threaded;
	350	int cpu, topology_id;
	351
	352	is_threaded = read_cpuid_mpidr() & MPIDR_MT_BITMASK;
	353
	354	for_each_possible_cpu(cpu) {
37c3ec2d JL	355	int i, cache_id;
37c3ec2d JL	356
2f0a5d10 JL	357	topology_id = find_acpi_cpu_topology(cpu, 0);
	358	if (topology_id < 0)
	359	return topology_id;
	360
	361	if (is_threaded) {
	362	cpu_topology[cpu].thread_id = topology_id;
	363	topology_id = find_acpi_cpu_topology(cpu, 1);
	364	cpu_topology[cpu].core_id = topology_id;
	365	} else {
	366	cpu_topology[cpu].thread_id = -1;
	367	cpu_topology[cpu].core_id = topology_id;
	368	}
	369	topology_id = find_acpi_cpu_topology_package(cpu);
	370	cpu_topology[cpu].package_id = topology_id;
37c3ec2d JL	371
	372	i = acpi_find_last_cache_level(cpu);
	373
	374	if (i > 0) {
	375	/*
	376	* this is the only part of cpu_topology that has
	377	* a direct relationship with the cache topology
	378	*/
	379	cache_id = find_acpi_cpu_cache_topology(cpu, i);
	380	if (cache_id > 0)
	381	cpu_topology[cpu].llc_id = cache_id;
	382	}
2f0a5d10 JL	383	}
	384
	385	return 0;
	386	}
	387
	388	#else
	389	static inline int __init parse_acpi_topology(void)
	390	{
	391	return -EINVAL;
	392	}
	393	#endif
	394
ebdc9447 MB	395	void __init init_cpu_topology(void)
	396	{
	397	reset_cpu_topology();
	398
	399	/*
	400	* Discard anything that was parsed if we hit an error so we
	401	* don't use partial information.
	402	*/
2f0a5d10 JL	403	if (!acpi_disabled && parse_acpi_topology())
	404	reset_cpu_topology();
	405	else if (of_have_populated_dt() && parse_dt_topology())
ebdc9447 MB	406	reset_cpu_topology();
ebdc9447 MB	407	}