#include "local.h"
-struct cluster_mask {
- unsigned int clusterid;
- int node;
- struct cpumask mask;
-};
+#define apic_cluster(apicid) ((apicid) >> 4)
/*
* __x2apic_send_IPI_mask() possibly needs to read
static u32 *x86_cpu_to_logical_apicid __read_mostly;
static DEFINE_PER_CPU(cpumask_var_t, ipi_mask);
-static DEFINE_PER_CPU_READ_MOSTLY(struct cluster_mask *, cluster_masks);
-static struct cluster_mask *cluster_hotplug_mask;
+static DEFINE_PER_CPU_READ_MOSTLY(struct cpumask *, cluster_masks);
static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
/* Collapse cpus in a cluster so a single IPI per cluster is sent */
for_each_cpu(cpu, tmpmsk) {
- struct cluster_mask *cmsk = per_cpu(cluster_masks, cpu);
+ struct cpumask *cmsk = per_cpu(cluster_masks, cpu);
dest = 0;
- for_each_cpu_and(clustercpu, tmpmsk, &cmsk->mask)
+ for_each_cpu_and(clustercpu, tmpmsk, cmsk)
dest |= x86_cpu_to_logical_apicid[clustercpu];
if (!dest)
__x2apic_send_IPI_dest(dest, vector, APIC_DEST_LOGICAL);
/* Remove cluster CPUs from tmpmask */
- cpumask_andnot(tmpmsk, tmpmsk, &cmsk->mask);
+ cpumask_andnot(tmpmsk, tmpmsk, cmsk);
}
local_irq_restore(flags);
static void init_x2apic_ldr(void)
{
- struct cluster_mask *cmsk = this_cpu_read(cluster_masks);
- u32 cluster, apicid = apic_read(APIC_LDR);
- unsigned int cpu;
+ struct cpumask *cmsk = this_cpu_read(cluster_masks);
- x86_cpu_to_logical_apicid[smp_processor_id()] = apicid;
+ BUG_ON(!cmsk);
- if (cmsk)
- goto update;
-
- cluster = apicid >> 16;
- for_each_online_cpu(cpu) {
- cmsk = per_cpu(cluster_masks, cpu);
- /* Matching cluster found. Link and update it. */
- if (cmsk && cmsk->clusterid == cluster)
- goto update;
+ cpumask_set_cpu(smp_processor_id(), cmsk);
+}
+
+/*
+ * As an optimisation during boot, set the cluster_mask for all present
+ * CPUs at once, to prevent each of them having to iterate over the others
+ * to find the existing cluster_mask.
+ */
+static void prefill_clustermask(struct cpumask *cmsk, unsigned int cpu, u32 cluster)
+{
+ int cpu_i;
+
+ for_each_present_cpu(cpu_i) {
+ struct cpumask **cpu_cmsk = &per_cpu(cluster_masks, cpu_i);
+ u32 apicid = apic->cpu_present_to_apicid(cpu_i);
+
+ if (apicid == BAD_APICID || cpu_i == cpu || apic_cluster(apicid) != cluster)
+ continue;
+
+ if (WARN_ON_ONCE(*cpu_cmsk == cmsk))
+ continue;
+
+ BUG_ON(*cpu_cmsk);
+ *cpu_cmsk = cmsk;
}
- cmsk = cluster_hotplug_mask;
- cmsk->clusterid = cluster;
- cluster_hotplug_mask = NULL;
-update:
- this_cpu_write(cluster_masks, cmsk);
- cpumask_set_cpu(smp_processor_id(), &cmsk->mask);
}
-static int alloc_clustermask(unsigned int cpu, int node)
+static int alloc_clustermask(unsigned int cpu, u32 cluster, int node)
{
+ struct cpumask *cmsk = NULL;
+ unsigned int cpu_i;
+
+ /*
+ * At boot time, the CPU present mask is stable. The cluster mask is
+ * allocated for the first CPU in the cluster and propagated to all
+ * present siblings in the cluster. If the cluster mask is already set
+ * on entry to this function for a given CPU, there is nothing to do.
+ */
if (per_cpu(cluster_masks, cpu))
return 0;
+
+ if (system_state < SYSTEM_RUNNING)
+ goto alloc;
+
/*
- * If a hotplug spare mask exists, check whether it's on the right
- * node. If not, free it and allocate a new one.
+ * On post boot hotplug for a CPU which was not present at boot time,
+ * iterate over all possible CPUs (even those which are not present
+ * any more) to find any existing cluster mask.
*/
- if (cluster_hotplug_mask) {
- if (cluster_hotplug_mask->node == node)
- return 0;
- kfree(cluster_hotplug_mask);
+ for_each_possible_cpu(cpu_i) {
+ u32 apicid = apic->cpu_present_to_apicid(cpu_i);
+
+ if (apicid != BAD_APICID && apic_cluster(apicid) == cluster) {
+ cmsk = per_cpu(cluster_masks, cpu_i);
+ /*
+ * If the cluster is already initialized, just store
+ * the mask and return. There's no need to propagate.
+ */
+ if (cmsk) {
+ per_cpu(cluster_masks, cpu) = cmsk;
+ return 0;
+ }
+ }
}
-
- cluster_hotplug_mask = kzalloc_node(sizeof(*cluster_hotplug_mask),
- GFP_KERNEL, node);
- if (!cluster_hotplug_mask)
+ /*
+ * No CPU in the cluster has ever been initialized, so fall through to
+ * the boot time code which will also populate the cluster mask for any
+ * other CPU in the cluster which is (now) present.
+ */
+alloc:
+ cmsk = kzalloc_node(sizeof(*cmsk), GFP_KERNEL, node);
+ if (!cmsk)
return -ENOMEM;
- cluster_hotplug_mask->node = node;
+ per_cpu(cluster_masks, cpu) = cmsk;
+ prefill_clustermask(cmsk, cpu, cluster);
+
return 0;
}
static int x2apic_prepare_cpu(unsigned int cpu)
{
- if (alloc_clustermask(cpu, cpu_to_node(cpu)) < 0)
+ u32 phys_apicid = apic->cpu_present_to_apicid(cpu);
+ u32 cluster = apic_cluster(phys_apicid);
+ u32 logical_apicid = (cluster << 16) | (1 << (phys_apicid & 0xf));
+
+ x86_cpu_to_logical_apicid[cpu] = logical_apicid;
+
+ if (alloc_clustermask(cpu, cluster, cpu_to_node(cpu)) < 0)
return -ENOMEM;
if (!zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL))
return -ENOMEM;
static int x2apic_dead_cpu(unsigned int dead_cpu)
{
- struct cluster_mask *cmsk = per_cpu(cluster_masks, dead_cpu);
+ struct cpumask *cmsk = per_cpu(cluster_masks, dead_cpu);
if (cmsk)
- cpumask_clear_cpu(dead_cpu, &cmsk->mask);
+ cpumask_clear_cpu(dead_cpu, cmsk);
free_cpumask_var(per_cpu(ipi_mask, dead_cpu));
return 0;
}
projects / linux-2.6-block.git / blobdiff