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/openbmc/linux/Documentation/arch/x86/
H A Dtopology.rst1 .. SPDX-License-Identifier: GPL-2.0
11 The architecture-agnostic topology definitions are in
12 Documentation/admin-guide/cputopology.rst. This file holds x86-specific
17 Needless to say, code should use the generic functions - this file is *only*
35 - packages
36 - cores
37 - threads
48 Package-related topology information in the kernel:
50 - cpuinfo_x86.x86_max_cores:
54 - cpuinfo_x86.x86_max_dies:
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/openbmc/qemu/docs/system/s390x/
H A Dcpu-topology.rst1 .. _cpu-topology-s390x:
3 CPU topology on s390x
6 Since QEMU 8.2, CPU topology on s390x provides up to 3 levels of
8 tree-shaped hierarchy.
10 The socket container has one or more CPU entries.
11 Each of these CPU entries consists of a bitmap and three CPU attributes:
13 - CPU type
14 - entitlement
15 - dedication
17 Each bit set in the bitmap correspond to a core-id of a vCPU with matching
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/openbmc/linux/arch/mips/kernel/
H A Dsmp-cps.c1 // SPDX-License-Identifier: GPL-2.0-or-later
7 #include <linux/cpu.h>
18 #include <asm/mips-cps.h>
21 #include <asm/pm-cps.h>
24 #include <asm/smp-cps.h>
32 static unsigned __init core_vpe_count(unsigned int cluster, unsigned core) in core_vpe_count() argument
34 return min(smp_max_threads, mips_cps_numvps(cluster, core)); in core_vpe_count()
60 /* Use the number of VPEs in cluster 0 core 0 for smp_num_siblings */ in cps_smp_setup()
64 for (v = 0; v < min_t(int, core_vpes, NR_CPUS - nvpes); v++) { in cps_smp_setup()
77 /* Indicate present CPUs (CPU being synonymous with VPE) */ in cps_smp_setup()
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/openbmc/linux/tools/perf/tests/
H A Dtopology.c1 // SPDX-License-Identifier: GPL-2.0
14 #define TEMPL "/tmp/perf-test-XXXXXX"
26 return -1; in get_temp()
44 session->evlist = evlist__new_default(); in session_write_header()
45 TEST_ASSERT_VAL("can't get evlist", session->evlist); in session_write_header()
47 perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY); in session_write_header()
48 perf_header__set_feat(&session->header, HEADER_NRCPUS); in session_write_header()
49 perf_header__set_feat(&session->header, HEADER_ARCH); in session_write_header()
51 session->header.data_size += DATA_SIZE; in session_write_header()
54 !perf_session__write_header(session, session->evlist, data.file.fd, true)); in session_write_header()
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/openbmc/linux/Documentation/devicetree/bindings/cpu/
H A Dcpu-topology.txt2 CPU topology binding description
6 1 - Introduction
12 - socket
13 - cluster
14 - core
15 - thread
17 The bottom hierarchy level sits at core or thread level depending on whether
18 symmetric multi-threading (SMT) is supported or not.
20 For instance in a system where CPUs support SMT, "cpu" nodes represent all
22 In systems where SMT is not supported "cpu" nodes represent all cores present
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/openbmc/linux/Documentation/admin-guide/pm/
H A Dintel-speed-select.rst1 .. SPDX-License-Identifier: GPL-2.0
8 collection of features that give more granular control over CPU performance.
14 - https://www.intel.com/content/www/us/en/architecture-and-technology/speed-select-technology-artic…
15 - https://builders.intel.com/docs/networkbuilders/intel-speed-select-technology-base-frequency-enha…
19 dynamically without pre-configuring via BIOS setup options. This dynamic
29 intel-speed-select configuration tool
32 Most Linux distribution packages may include the "intel-speed-select" tool. If not,
38 # cd tools/power/x86/intel-speed-select/
43 ------------
47 # intel-speed-select --help
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/openbmc/linux/tools/perf/util/
H A Dbpf_counter_cgroup.c1 // SPDX-License-Identifier: GPL-2.0
42 #define FD(evt, cpu) (*(int *)xyarray__entry(evt->core.fd, cpu, 0)) argument
50 struct perf_cpu cpu; in bperf_load_program() local
51 int total_cpus = cpu__max_cpu().cpu; in bperf_load_program()
58 return -1; in bperf_load_program()
61 skel->rodata->num_cpus = total_cpus; in bperf_load_program()
62 skel->rodata->num_events = evlist->core.nr_entries / nr_cgroups; in bperf_load_program()
64 BUG_ON(evlist->core.nr_entries % nr_cgroups != 0); in bperf_load_program()
66 /* we need one copy of events per cpu for reading */ in bperf_load_program()
67 map_size = total_cpus * evlist->core.nr_entries / nr_cgroups; in bperf_load_program()
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H A Dcpumap.h1 /* SPDX-License-Identifier: GPL-2.0 */
10 /** Identify where counts are aggregated, -1 implies not to aggregate. */
18 * /sys/devices/system/cpu/cpuX/topology/physical_package_id.
21 /** The die id as read from /sys/devices/system/cpu/cpuX/topology/die_id. */
23 /** The cache level as read from /sys/devices/system/cpu/cpuX/cache/indexY/level */
26 * The cache instance ID, which is the first CPU in the
27 * /sys/devices/system/cpu/cpuX/cache/indexY/shared_cpu_list
30 /** The core id as read from /sys/devices/system/cpu/cpuX/topology/core_id. */
31 int core; member
32 /** CPU aggregation, note there is one CPU for each SMT thread. */
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H A Dmmap.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2011-2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
5 * Parts came from evlist.c builtin-{top,stat,record}.c, see those files for further
34 len = bitmap_scnprintf(mask->bits, mask->nbits, buf, MASK_SIZE); in mmap_cpu_mask__scnprintf()
36 pr_debug("%p: %s mask[%zd]: %s\n", mask, tag, mask->nbits, buf); in mmap_cpu_mask__scnprintf()
41 return perf_mmap__mmap_len(&map->core); in mmap__mmap_len()
73 return map->aio.nr_cblocks > 0; in perf_mmap__aio_enabled()
79 map->aio.data[idx] = mmap(NULL, mmap__mmap_len(map), PROT_READ|PROT_WRITE, in perf_mmap__aio_alloc()
81 if (map->aio.data[idx] == MAP_FAILED) { in perf_mmap__aio_alloc()
82 map->aio.data[idx] = NULL; in perf_mmap__aio_alloc()
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/openbmc/qemu/tests/functional/
H A Dtest_s390x_topology.py11 # later. See the COPYING file in the top-level directory.
25 S390x CPU topology consists of 4 topology layers, from bottom to top,
28 See: docs/system/s390x/cpu-topology.rst.
30 S390x CPU topology is setup in different ways:
31 - implicitly from the '-smp' argument by completing each topology
34 - explicitly from the '-device' argument on the QEMU command line
35 - explicitly by hotplug of a new CPU using QMP or HMP
36 - it is modified by using QMP 'set-cpu-topology'
51 '/fedora-secondary/releases/35/Server/s390x/os'
57 '/fedora-secondary/releases/35/Server/s390x/os'
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/openbmc/linux/tools/perf/pmu-events/arch/x86/haswell/
H A Dhsw-metrics.json4 "MetricExpr": "cstate_pkg@c2\\-residency@ / TSC",
10 "BriefDescription": "C3 residency percent per core",
11 "MetricExpr": "cstate_core@c3\\-residency@ / TSC",
18 "MetricExpr": "cstate_pkg@c3\\-residency@ / TSC",
24 "BriefDescription": "C6 residency percent per core",
25 "MetricExpr": "cstate_core@c6\\-residency@ / TSC",
32 "MetricExpr": "cstate_pkg@c6\\-residency@ / TSC",
38 "BriefDescription": "C7 residency percent per core",
39 "MetricExpr": "cstate_core@c7\\-residency@ / TSC",
46 "MetricExpr": "cstate_pkg@c7\\-residency@ / TSC",
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/openbmc/linux/arch/powerpc/include/asm/
H A Dcputhreads.h1 /* SPDX-License-Identifier: GPL-2.0 */
13 * threads per core and the same number for each core in the system
15 * as the CPU numbers are still allocated, just not brought online).
41 int cpu_core_index_of_thread(int cpu);
42 int cpu_first_thread_of_core(int core);
44 static inline int cpu_core_index_of_thread(int cpu) { return cpu; } in cpu_core_index_of_thread() argument
45 static inline int cpu_first_thread_of_core(int core) { return core; } in cpu_first_thread_of_core() argument
48 static inline int cpu_thread_in_core(int cpu) in cpu_thread_in_core() argument
50 return cpu & (threads_per_core - 1); in cpu_thread_in_core()
53 static inline int cpu_thread_in_subcore(int cpu) in cpu_thread_in_subcore() argument
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/openbmc/linux/arch/arm/mach-bcm/
H A Dplatsmp.c1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2014-2015 Broadcom Corporation
12 #include <linux/irqchip/irq-bcm2836.h>
34 #define OF_SECONDARY_BOOT "secondary-boot-reg"
54 return -ENXIO; in scu_a9_enable()
60 pr_err("hardware reports only one core\n"); in scu_a9_enable()
61 return -ENOENT; in scu_a9_enable()
68 return -ENOMEM; in scu_a9_enable()
78 static u32 secondary_boot_addr_for(unsigned int cpu) in secondary_boot_addr_for() argument
81 struct device_node *cpu_node = of_get_cpu_node(cpu, NULL); in secondary_boot_addr_for()
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/openbmc/linux/tools/power/cpupower/lib/
H A Dcpupower.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
19 if (access(path, F_OK) == -1) in is_valid_path()
30 if (fd == -1) in cpupower_read_sysfs()
33 numread = read(fd, buf, buflen - 1); in cpupower_read_sysfs()
51 if (fd == -1) in cpupower_write_sysfs()
54 numwritten = write(fd, buf, buflen - 1); in cpupower_write_sysfs()
58 return -1; in cpupower_write_sysfs()
67 * Detect whether a CPU is online
70 * 1 -> if CPU is online
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/openbmc/qemu/docs/devel/
H A Ds390-cpu-topology.rst1 QAPI interface for S390 CPU topology
4 The following sections will explain the QAPI interface for S390 CPU topology
7 command, defining 4 CPUs, where CPU[0] is defined by the -smp argument and will
10 .. code-block:: bash
12 qemu-system-s390x \
13 -enable-kvm \
14 -cpu z14,ctop=on \
15 -smp 1,drawers=3,books=3,sockets=2,cores=2,maxcpus=36 \
16 -device z14-s390x-cpu,core-id=19,entitlement=high \
17 -device z14-s390x-cpu,core-id=11,entitlement=low \
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/openbmc/linux/Documentation/devicetree/bindings/regulator/
H A Dnvidia,tegra-regulators-coupling.txt4 NVIDIA Tegra SoC's have a mandatory voltage-coupling between regulators.
9 ------------------------
11 On Tegra20 SoC's there are 3 coupled regulators: CORE, RTC and CPU.
12 The CORE and RTC voltages shall be in a range of 170mV from each other
13 and they both shall be higher than the CPU voltage by at least 120mV.
16 ------------------------
18 On Tegra30 SoC's there are 2 coupled regulators: CORE and CPU. The CORE
19 and CPU voltages shall be in a range of 300mV from each other and CORE
20 voltage shall be higher than the CPU by N mV, where N depends on the CPU
24 - nvidia,tegra-core-regulator: Boolean property that designates regulator
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/openbmc/linux/drivers/platform/x86/intel/ifs/
H A Druntest.c1 // SPDX-License-Identifier: GPL-2.0-only
4 #include <linux/cpu.h>
15 * ifs_sem. On HT systems all threads on a core will
17 * core will update results of the test.
27 * Number of TSC cycles that a logical CPU will wait for the other
28 * logical CPU on the core in the WRMSR(ACTIVATE_SCAN).
50 "Core Abort SCAN Response due to power management condition.",
53 [IFS_CORE_NOT_CAPABLE_CURRENTLY] = "Core not capable of performing SCAN currently",
56 "Exceeded number of Logical Processors (LP) allowed to run Scan-At-Field concurrently",
60 static void message_not_tested(struct device *dev, int cpu, union ifs_status status) in message_not_tested() argument
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/openbmc/qemu/tests/qtest/
H A Dnuma-test.c9 * See the COPYING file in the top-level directory.
19 return g_strdup_printf("%s %s", generic_cli->str, test_cli); in make_cli()
28 cli = make_cli(data, "-machine smp.cpus=8 -numa node,nodeid=0,memdev=ram,cpus=0-3 " in test_mon_explicit()
29 "-numa node,nodeid=1,cpus=4-7"); in test_mon_explicit()
45 cli = make_cli(data, "-machine smp.cpus=8,smp.sockets=8 " in test_def_cpu_split()
46 "-numa node,memdev=ram -numa node"); in test_def_cpu_split()
62 cli = make_cli(data, "-machine smp.cpus=8 " in test_mon_partial()
63 "-numa node,nodeid=0,memdev=ram,cpus=0-1 " in test_mon_partial()
64 "-numa node,nodeid=1,cpus=4-5 "); in test_mon_partial()
76 *resp = qtest_qmp(qts, "{ 'execute': 'query-cpus-fast' }"); in get_cpus()
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/openbmc/linux/tools/perf/pmu-events/arch/x86/haswellx/
H A Dhsx-metrics.json4 "MetricExpr": "cstate_pkg@c2\\-residency@ / TSC",
10 "BriefDescription": "C3 residency percent per core",
11 "MetricExpr": "cstate_core@c3\\-residency@ / TSC",
18 "MetricExpr": "cstate_pkg@c3\\-residency@ / TSC",
24 "BriefDescription": "C6 residency percent per core",
25 "MetricExpr": "cstate_core@c6\\-residency@ / TSC",
32 "MetricExpr": "cstate_pkg@c6\\-residency@ / TSC",
38 "BriefDescription": "C7 residency percent per core",
39 "MetricExpr": "cstate_core@c7\\-residency@ / TSC",
46 "MetricExpr": "cstate_pkg@c7\\-residency@ / TSC",
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/openbmc/qemu/docs/system/
H A Dcpu-hotplug.rst2 Virtual CPU hotplug
5 A complete example of vCPU hotplug (and hot-unplug) using QMP
9 ------------
14 $ qemu-system-x86_64 -display none -no-user-config -m 2048 \
15 -nodefaults -monitor stdio -machine pc,accel=kvm,usb=off \
16 -smp 1,maxcpus=2 -cpu IvyBridge-IBRS \
17 -qmp unix:/tmp/qmp-sock,server=on,wait=off
19 (2) Run 'qmp-shell' (located in the source tree, under: "scripts/qmp/)
20 to connect to the just-launched QEMU::
22 $> ./qmp-shell -p -v /tmp/qmp-sock
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/openbmc/linux/tools/perf/pmu-events/arch/x86/broadwell/
H A Dbdw-metrics.json4 "MetricExpr": "cstate_pkg@c2\\-residency@ / TSC",
10 "BriefDescription": "C3 residency percent per core",
11 "MetricExpr": "cstate_core@c3\\-residency@ / TSC",
18 "MetricExpr": "cstate_pkg@c3\\-residency@ / TSC",
24 "BriefDescription": "C6 residency percent per core",
25 "MetricExpr": "cstate_core@c6\\-residency@ / TSC",
32 "MetricExpr": "cstate_pkg@c6\\-residency@ / TSC",
38 "BriefDescription": "C7 residency percent per core",
39 "MetricExpr": "cstate_core@c7\\-residency@ / TSC",
46 "MetricExpr": "cstate_pkg@c7\\-residency@ / TSC",
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/openbmc/linux/tools/perf/pmu-events/arch/x86/broadwellde/
H A Dbdwde-metrics.json4 "MetricExpr": "cstate_pkg@c2\\-residency@ / TSC",
10 "BriefDescription": "C3 residency percent per core",
11 "MetricExpr": "cstate_core@c3\\-residency@ / TSC",
18 "MetricExpr": "cstate_pkg@c3\\-residency@ / TSC",
24 "BriefDescription": "C6 residency percent per core",
25 "MetricExpr": "cstate_core@c6\\-residency@ / TSC",
32 "MetricExpr": "cstate_pkg@c6\\-residency@ / TSC",
38 "BriefDescription": "C7 residency percent per core",
39 "MetricExpr": "cstate_core@c7\\-residency@ / TSC",
46 "MetricExpr": "cstate_pkg@c7\\-residency@ / TSC",
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/openbmc/qemu/hw/arm/
H A Dbcm2836.c9 * See the COPYING file in the top-level directory.
18 #include "target/arm/cpu-qom.h"
22 DEFINE_PROP_UINT32("enabled-cpus", BCM283XBaseState, enabled_cpus, 0);
30 for (n = 0; n < bc->core_count; n++) { in bcm283x_base_init()
31 object_initialize_child(obj, "cpu[*]", &s->cpu[n].core, in bcm283x_base_init()
32 bc->cpu_type); in bcm283x_base_init()
34 if (bc->core_count > 1) { in bcm283x_base_init()
36 qdev_prop_set_uint32(DEVICE(obj), "enabled-cpus", bc->core_count); in bcm283x_base_init()
39 if (bc->ctrl_base) { in bcm283x_base_init()
40 object_initialize_child(obj, "control", &s->control, in bcm283x_base_init()
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/openbmc/linux/drivers/of/
H A Dcpu.c1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/cpu.h>
7 * of_get_cpu_hwid - Get the hardware ID from a CPU device node
9 * @cpun: CPU number(logical index) for which device node is required
12 * Return: The hardware ID for the CPU node or ~0ULL if not found.
29 * arch_match_cpu_phys_id - Match the given logical CPU and physical id
31 * @cpu: logical cpu index of a core/thread
32 * @phys_id: physical identifier of a core/thread
34 * CPU logical to physical index mapping is architecture specific.
36 * id to logical cpu index. phys_id provided here is usually values read
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/openbmc/linux/Documentation/devicetree/bindings/arm/msm/
H A Dqcom,idle-state.txt3 ARM provides idle-state node to define the cpuidle states, as defined in [1].
4 cpuidle-qcom is the cpuidle driver for Qualcomm SoCs and uses these idle
6 The idle states supported by the QCOM SoC are defined as -
14 When the WFI instruction is executed the ARM core would gate its internal
17 interrupt to trigger the core back in to active. This triggers the cache
20 cache hierarchy is also out of standby, and then the cpu is allowed to resume
26 Retention: Retention is a low power state where the core is clock gated and
27 the memory and the registers associated with the core are retained. The
30 sequence and would wait for interrupt, before restoring the cpu to execution
33 Standalone PC: A cpu can power down and warmboot if there is a sufficient time
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