Release 4.18 arch/x86/kernel/apic/x2apic_cluster.c
// SPDX-License-Identifier: GPL-2.0
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/dmar.h>
#include <linux/irq.h>
#include <linux/cpu.h>
#include <asm/smp.h>
#include "x2apic.h"
struct cluster_mask {
unsigned int clusterid;
int node;
struct cpumask mask;
};
static DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
static DEFINE_PER_CPU(cpumask_var_t, ipi_mask);
static DEFINE_PER_CPU(struct cluster_mask *, cluster_masks);
static struct cluster_mask *cluster_hotplug_mask;
static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
return x2apic_enabled();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Yinghai Lu | 16 | 88.89% | 1 | 50.00% |
| Suresh B. Siddha | 2 | 11.11% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
static void x2apic_send_IPI(int cpu, int vector)
{
u32 dest = per_cpu(x86_cpu_to_logical_apicid, cpu);
x2apic_wrmsr_fence();
__x2apic_send_IPI_dest(dest, vector, APIC_DEST_LOGICAL);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 34 | 100.00% | 1 | 100.00% |
| Total | 34 | 100.00% | 1 | 100.00% |
static void
__x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
{
unsigned int cpu, clustercpu;
struct cpumask *tmpmsk;
unsigned long flags;
u32 dest;
x2apic_wrmsr_fence();
local_irq_save(flags);
tmpmsk = this_cpu_cpumask_var_ptr(ipi_mask);
cpumask_copy(tmpmsk, mask);
/* If IPI should not be sent to self, clear current CPU */
if (apic_dest != APIC_DEST_ALLINC)
cpumask_clear_cpu(smp_processor_id(), tmpmsk);
/* 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);
dest = 0;
for_each_cpu_and(clustercpu, tmpmsk, &cmsk->mask)
dest |= per_cpu(x86_cpu_to_logical_apicid, clustercpu);
if (!dest)
continue;
__x2apic_send_IPI_dest(dest, vector, apic->dest_logical);
/* Remove cluster CPUs from tmpmask */
cpumask_andnot(tmpmsk, tmpmsk, &cmsk->mask);
}
local_irq_restore(flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 45 | 30.00% | 1 | 8.33% |
| Thomas Gleixner | 43 | 28.67% | 1 | 8.33% |
| Suresh B. Siddha | 40 | 26.67% | 3 | 25.00% |
| Mike Travis | 10 | 6.67% | 2 | 16.67% |
| Mel Gorman | 6 | 4.00% | 1 | 8.33% |
| Ingo Molnar | 5 | 3.33% | 3 | 25.00% |
| Christoph Lameter | 1 | 0.67% | 1 | 8.33% |
| Total | 150 | 100.00% | 12 | 100.00% |
static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
{
__x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Travis | 19 | 79.17% | 2 | 50.00% |
| Suresh B. Siddha | 4 | 16.67% | 1 | 25.00% |
| Ingo Molnar | 1 | 4.17% | 1 | 25.00% |
| Total | 24 | 100.00% | 4 | 100.00% |
static void
x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
{
__x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Suresh B. Siddha | 24 | 100.00% | 2 | 100.00% |
| Total | 24 | 100.00% | 2 | 100.00% |
static void x2apic_send_IPI_allbutself(int vector)
{
__x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Suresh B. Siddha | 17 | 94.44% | 2 | 66.67% |
| Mike Travis | 1 | 5.56% | 1 | 33.33% |
| Total | 18 | 100.00% | 3 | 100.00% |
static void x2apic_send_IPI_all(int vector)
{
__x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Suresh B. Siddha | 17 | 94.44% | 2 | 66.67% |
| Mike Travis | 1 | 5.56% | 1 | 33.33% |
| Total | 18 | 100.00% | 3 | 100.00% |
static u32 x2apic_calc_apicid(unsigned int cpu)
{
return per_cpu(x86_cpu_to_logical_apicid, cpu);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Thomas Gleixner | 18 | 100.00% | 1 | 100.00% |
| Total | 18 | 100.00% | 1 | 100.00% |
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;
this_cpu_write(x86_cpu_to_logical_apicid, apicid);
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;
}
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Thomas Gleixner | 83 | 72.17% | 2 | 40.00% |
| Cyrill V. Gorcunov | 16 | 13.91% | 1 | 20.00% |
| Suresh B. Siddha | 15 | 13.04% | 1 | 20.00% |
| Rusty Russell | 1 | 0.87% | 1 | 20.00% |
| Total | 115 | 100.00% | 5 | 100.00% |
static int alloc_clustermask(unsigned int cpu, int node)
{
if (per_cpu(cluster_masks, cpu))
return 0;
/*
* If a hotplug spare mask exists, check whether it's on the right
* node. If not, free it and allocate a new one.
*/
if (cluster_hotplug_mask) {
if (cluster_hotplug_mask->node == node)
return 0;
kfree(cluster_hotplug_mask);
}
cluster_hotplug_mask = kzalloc_node(sizeof(*cluster_hotplug_mask),
GFP_KERNEL, node);
if (!cluster_hotplug_mask)
return -ENOMEM;
cluster_hotplug_mask->node = node;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Thomas Gleixner | 68 | 83.95% | 1 | 50.00% |
| Cyrill V. Gorcunov | 13 | 16.05% | 1 | 50.00% |
| Total | 81 | 100.00% | 2 | 100.00% |
static int x2apic_prepare_cpu(unsigned int cpu)
{
if (alloc_clustermask(cpu, cpu_to_node(cpu)) < 0)
return -ENOMEM;
if (!zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL))
return -ENOMEM;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 32 | 62.75% | 2 | 40.00% |
| Sebastian Andrzej Siewior | 13 | 25.49% | 2 | 40.00% |
| Thomas Gleixner | 6 | 11.76% | 1 | 20.00% |
| Total | 51 | 100.00% | 5 | 100.00% |
static int x2apic_dead_cpu(unsigned int dead_cpu)
{
struct cluster_mask *cmsk = per_cpu(cluster_masks, dead_cpu);
cpumask_clear_cpu(dead_cpu, &cmsk->mask);
free_cpumask_var(per_cpu(ipi_mask, dead_cpu));
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 20 | 44.44% | 2 | 28.57% |
| Thomas Gleixner | 14 | 31.11% | 1 | 14.29% |
| Sebastian Andrzej Siewior | 9 | 20.00% | 2 | 28.57% |
| Borislav Petkov | 1 | 2.22% | 1 | 14.29% |
| Rusty Russell | 1 | 2.22% | 1 | 14.29% |
| Total | 45 | 100.00% | 7 | 100.00% |
static int x2apic_cluster_probe(void)
{
if (!x2apic_mode)
return 0;
if (cpuhp_setup_state(CPUHP_X2APIC_PREPARE, "x86/x2apic:prepare",
x2apic_prepare_cpu, x2apic_dead_cpu) < 0) {
pr_err("Failed to register X2APIC_PREPARE\n");
return 0;
}
init_x2apic_ldr();
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sebastian Andrzej Siewior | 30 | 63.83% | 2 | 28.57% |
| Cyrill V. Gorcunov | 11 | 23.40% | 2 | 28.57% |
| Thomas Gleixner | 5 | 10.64% | 2 | 28.57% |
| Suresh B. Siddha | 1 | 2.13% | 1 | 14.29% |
| Total | 47 | 100.00% | 7 | 100.00% |
static struct apic apic_x2apic_cluster __ro_after_init = {
.name = "cluster x2apic",
.probe = x2apic_cluster_probe,
.acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
.apic_id_valid = x2apic_apic_id_valid,
.apic_id_registered = x2apic_apic_id_registered,
.irq_delivery_mode = dest_Fixed,
.irq_dest_mode = 1, /* logical */
.disable_esr = 0,
.dest_logical = APIC_DEST_LOGICAL,
.check_apicid_used = NULL,
.init_apic_ldr = init_x2apic_ldr,
.ioapic_phys_id_map = NULL,
.setup_apic_routing = NULL,
.cpu_present_to_apicid = default_cpu_present_to_apicid,
.apicid_to_cpu_present = NULL,
.check_phys_apicid_present = default_check_phys_apicid_present,
.phys_pkg_id = x2apic_phys_pkg_id,
.get_apic_id = x2apic_get_apic_id,
.set_apic_id = x2apic_set_apic_id,
.calc_dest_apicid = x2apic_calc_apicid,
.send_IPI = x2apic_send_IPI,
.send_IPI_mask = x2apic_send_IPI_mask,
.send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
.send_IPI_allbutself = x2apic_send_IPI_allbutself,
.send_IPI_all = x2apic_send_IPI_all,
.send_IPI_self = x2apic_send_IPI_self,
.inquire_remote_apic = NULL,
.read = native_apic_msr_read,
.write = native_apic_msr_write,
.eoi_write = native_apic_msr_eoi_write,
.icr_read = native_x2apic_icr_read,
.icr_write = native_x2apic_icr_write,
.wait_icr_idle = native_x2apic_wait_icr_idle,
.safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle,
};
apic_driver(apic_x2apic_cluster);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Thomas Gleixner | 274 | 30.24% | 7 | 14.89% |
| Suresh B. Siddha | 195 | 21.52% | 7 | 14.89% |
| Cyrill V. Gorcunov | 156 | 17.22% | 3 | 6.38% |
| Ingo Molnar | 74 | 8.17% | 9 | 19.15% |
| Yinghai Lu | 61 | 6.73% | 3 | 6.38% |
| Sebastian Andrzej Siewior | 52 | 5.74% | 2 | 4.26% |
| Linus Torvalds | 39 | 4.30% | 1 | 2.13% |
| Mike Travis | 32 | 3.53% | 3 | 6.38% |
| Mel Gorman | 6 | 0.66% | 1 | 2.13% |
| Michael S. Tsirkin | 5 | 0.55% | 2 | 4.26% |
| Daniel J Blueman | 4 | 0.44% | 1 | 2.13% |
| Rusty Russell | 2 | 0.22% | 2 | 4.26% |
| Greg Kroah-Hartman | 1 | 0.11% | 1 | 2.13% |
| Borislav Petkov | 1 | 0.11% | 1 | 2.13% |
| Christoph Lameter | 1 | 0.11% | 1 | 2.13% |
| Steffen Persvold | 1 | 0.11% | 1 | 2.13% |
| Jaswinder Singh Rajput | 1 | 0.11% | 1 | 2.13% |
| Kees Cook | 1 | 0.11% | 1 | 2.13% |
| Total | 906 | 100.00% | 47 | 100.00% |
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