arm: topology: Add support for topology DT bindings
Add support for parsing the explicit topology bindings to discover the topology of the system. Change-Id: I7f8a62d243fe1452408ab696ea2714aaa5b929eb Signed-off-by: Venkatesh Yadav Abbarapu <vabbar@codeaurora.org> [satyap: resolve trivial merge conflicts] Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
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2 changed files with 198 additions and 21 deletions
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@ -8,14 +8,14 @@
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struct cputopo_arm {
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int thread_id;
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int core_id;
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int socket_id;
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int cluster_id;
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cpumask_t thread_sibling;
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cpumask_t core_sibling;
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};
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extern struct cputopo_arm cpu_topology[NR_CPUS];
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#define topology_physical_package_id(cpu) (cpu_topology[cpu].socket_id)
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#define topology_physical_package_id(cpu) (cpu_topology[cpu].cluster_id)
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#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
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#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
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#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)
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@ -52,6 +52,144 @@ static void set_capacity_scale(unsigned int cpu, unsigned long capacity)
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per_cpu(cpu_scale, cpu) = capacity;
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}
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static int __init get_cpu_for_node(struct device_node *node)
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{
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struct device_node *cpu_node;
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int cpu;
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cpu_node = of_parse_phandle(node, "cpu", 0);
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if (!cpu_node)
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return -EINVAL;
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for_each_possible_cpu(cpu) {
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if (of_get_cpu_node(cpu, NULL) == cpu_node) {
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of_node_put(cpu_node);
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return cpu;
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}
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}
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pr_crit("Unable to find CPU node for %s\n", cpu_node->full_name);
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of_node_put(cpu_node);
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return -EINVAL;
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}
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static int __init parse_core(struct device_node *core, int cluster_id,
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int core_id)
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{
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char name[10];
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bool leaf = true;
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int i = 0;
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int cpu;
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struct device_node *t;
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do {
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snprintf(name, sizeof(name), "thread%d", i);
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t = of_get_child_by_name(core, name);
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if (t) {
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leaf = false;
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cpu = get_cpu_for_node(t);
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if (cpu >= 0) {
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cpu_topology[cpu].cluster_id = cluster_id;
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cpu_topology[cpu].core_id = core_id;
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cpu_topology[cpu].thread_id = i;
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} else {
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pr_err("%s: Can't get CPU for thread\n",
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t->full_name);
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of_node_put(t);
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return -EINVAL;
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}
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of_node_put(t);
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}
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i++;
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} while (t);
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cpu = get_cpu_for_node(core);
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if (cpu >= 0) {
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if (!leaf) {
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pr_err("%s: Core has both threads and CPU\n",
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core->full_name);
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return -EINVAL;
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}
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cpu_topology[cpu].cluster_id = cluster_id;
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cpu_topology[cpu].core_id = core_id;
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} else if (leaf) {
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pr_err("%s: Can't get CPU for leaf core\n", core->full_name);
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return -EINVAL;
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}
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return 0;
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}
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static int __init parse_cluster(struct device_node *cluster, int depth)
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{
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char name[10];
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bool leaf = true;
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bool has_cores = false;
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struct device_node *c;
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int core_id = 0;
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int i, ret;
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static int cluster_id __initdata;
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/*
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* First check for child clusters; we currently ignore any
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* information about the nesting of clusters and present the
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* scheduler with a flat list of them.
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*/
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i = 0;
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do {
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snprintf(name, sizeof(name), "cluster%d", i);
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c = of_get_child_by_name(cluster, name);
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if (c) {
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leaf = false;
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ret = parse_cluster(c, depth + 1);
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of_node_put(c);
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if (ret != 0)
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return ret;
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}
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i++;
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} while (c);
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/* Now check for cores */
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i = 0;
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do {
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snprintf(name, sizeof(name), "core%d", i);
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c = of_get_child_by_name(cluster, name);
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if (c) {
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has_cores = true;
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if (depth == 0) {
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pr_err("%s: cpu-map children should be clusters\n",
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c->full_name);
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of_node_put(c);
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return -EINVAL;
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}
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if (leaf) {
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ret = parse_core(c, cluster_id, core_id++);
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} else {
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pr_err("%s: Non-leaf cluster with core %s\n",
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cluster->full_name, name);
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ret = -EINVAL;
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}
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of_node_put(c);
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if (ret != 0)
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return ret;
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}
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i++;
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} while (c);
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if (leaf && !has_cores)
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pr_warn("%s: empty cluster\n", cluster->full_name);
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if (leaf)
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cluster_id++;
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return 0;
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}
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#ifdef CONFIG_OF
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struct cpu_efficiency {
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const char *compatible;
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@ -87,14 +225,40 @@ static unsigned long middle_capacity = 1;
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* 'average' CPU is of middle capacity. Also see the comments near
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* table_efficiency[] and update_cpu_capacity().
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*/
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static void __init parse_dt_topology(void)
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static int __init parse_dt_topology(void)
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{
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const struct cpu_efficiency *cpu_eff;
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struct device_node *cn = NULL;
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struct device_node *cn = NULL, *map;
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unsigned long min_capacity = ULONG_MAX;
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unsigned long max_capacity = 0;
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unsigned long capacity = 0;
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int cpu = 0;
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int cpu = 0, ret = 0;
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cn = of_find_node_by_path("/cpus");
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if (!cn) {
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pr_err("No CPU information found in DT\n");
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return 0;
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}
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/*
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* When topology is provided cpu-map is essentially a root
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* cluster with restricted subnodes.
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*/
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map = of_get_child_by_name(cn, "cpu-map");
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if (!map)
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goto out;
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ret = parse_cluster(map, 0);
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if (ret != 0)
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goto out_map;
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/*
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* Check that all cores are in the topology; the SMP code will
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* only mark cores described in the DT as possible.
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*/
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for_each_possible_cpu(cpu)
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if (cpu_topology[cpu].cluster_id == -1)
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ret = -EINVAL;
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__cpu_capacity = kcalloc(nr_cpu_ids, sizeof(*__cpu_capacity),
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GFP_NOWAIT);
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@ -150,7 +314,11 @@ static void __init parse_dt_topology(void)
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else
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middle_capacity = ((max_capacity / 3)
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>> (SCHED_CAPACITY_SHIFT-1)) + 1;
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out_map:
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of_node_put(map);
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out:
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of_node_put(cn);
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return ret;
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}
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/*
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@ -170,7 +338,7 @@ static void update_cpu_capacity(unsigned int cpu)
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}
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#else
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static inline void parse_dt_topology(void) {}
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static inline int parse_dt_topology(void) {}
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static inline void update_cpu_capacity(unsigned int cpuid) {}
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#endif
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@ -203,7 +371,7 @@ static void update_siblings_masks(unsigned int cpuid)
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for_each_possible_cpu(cpu) {
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cpu_topo = &cpu_topology[cpu];
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if (cpuid_topo->socket_id != cpu_topo->socket_id)
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if (cpuid_topo->cluster_id != cpu_topo->cluster_id)
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continue;
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cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
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@ -230,9 +398,8 @@ void store_cpu_topology(unsigned int cpuid)
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struct cputopo_arm *cpuid_topo = &cpu_topology[cpuid];
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unsigned int mpidr;
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/* If the cpu topology has been already set, just return */
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if (cpuid_topo->core_id != -1)
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return;
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goto topology_populated;
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mpidr = read_cpuid_mpidr();
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@ -247,12 +414,12 @@ void store_cpu_topology(unsigned int cpuid)
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/* core performance interdependency */
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cpuid_topo->thread_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
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cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
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cpuid_topo->socket_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
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cpuid_topo->cluster_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
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} else {
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/* largely independent cores */
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cpuid_topo->thread_id = -1;
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cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
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cpuid_topo->socket_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
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cpuid_topo->cluster_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
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}
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} else {
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/*
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@ -262,17 +429,17 @@ void store_cpu_topology(unsigned int cpuid)
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*/
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cpuid_topo->thread_id = -1;
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cpuid_topo->core_id = 0;
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cpuid_topo->socket_id = -1;
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cpuid_topo->cluster_id = -1;
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}
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update_siblings_masks(cpuid);
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update_cpu_capacity(cpuid);
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pr_info("CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n",
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pr_info("CPU%u: thread %d, cpu %d, cluster %d, mpidr %x\n",
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cpuid, cpu_topology[cpuid].thread_id,
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cpu_topology[cpuid].core_id,
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cpu_topology[cpuid].socket_id, mpidr);
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cpu_topology[cpuid].cluster_id, mpidr);
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topology_populated:
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update_siblings_masks(cpuid);
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update_cpu_capacity(cpuid);
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}
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static inline int cpu_corepower_flags(void)
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@ -303,7 +470,7 @@ void __init init_cpu_topology(void)
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cpu_topo->thread_id = -1;
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cpu_topo->core_id = -1;
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cpu_topo->socket_id = -1;
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cpu_topo->cluster_id = -1;
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cpumask_clear(&cpu_topo->core_sibling);
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cpumask_clear(&cpu_topo->thread_sibling);
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}
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smp_wmb();
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parse_dt_topology();
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if (parse_dt_topology()) {
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struct cputopo_arm *cpu_topo = &(cpu_topology[cpu]);
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cpu_topo->thread_id = -1;
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cpu_topo->core_id = -1;
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cpu_topo->cluster_id = -1;
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cpumask_clear(&cpu_topo->core_sibling);
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cpumask_clear(&cpu_topo->thread_sibling);
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set_capacity_scale(cpu, SCHED_CAPACITY_SCALE);
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}
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/* Set scheduler topology descriptor */
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set_sched_topology(arm_topology);
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