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/linux/tools/perf/util/
H A Dcpumap.h1 /* SPDX-License-Identifier: GPL-2.0 */
9 /** Identify where counts are aggregated, -1 implies not to aggregate. */
13 /** The numa node X as read from /sys/devices/system/node/nodeX. */
16 * The socket number as read from
17 * /sys/devices/system/cpu/cpuX/topology/physical_package_id.
20 /** The die id as read from /sys/devices/system/cpu/cpuX/topology/die_id. */
22 /** The cluster id as read fro
35 struct perf_cpu cpu; global() member
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/linux/tools/virtio/virtio-trace/
H A Dtrace-agent.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * Guest agent for virtio-trace
15 #include "trace-agent.h"
23 #define READ_PATH_FMT "%s/per_cpu/cpu%d/trace_pipe_raw"
24 #define WRITE_PATH_FMT "/dev/virtio-ports/trace-path-cpu%d"
25 #define CTL_PATH "/dev/virtio-ports/agent-ctl-path"
35 pr_err("Could not read cpus\n"); in get_total_cpus()
59 s->pipe_size = PIPE_INIT; in agent_info_new()
60 s->use_stdout = false; in agent_info_new()
61 s->cpus = get_total_cpus(); in agent_info_new()
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H A Dtrace-agent-rw.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * Read/write thread of a guest agent for virtio-trace
16 #include "trace-agent.h"
30 rw_ti->cpu_num = -1; in rw_thread_info_new()
31 rw_ti->in_fd = -1; in rw_thread_info_new()
32 rw_ti->out_fd = -1; in rw_thread_info_new()
33 rw_ti->read_pipe = -1; in rw_thread_info_new()
34 rw_ti->write_pipe = -1; in rw_thread_info_new()
35 rw_ti->pipe_size = PIPE_INIT; in rw_thread_info_new()
40 void *rw_thread_init(int cpu, const char *in_path, const char *out_path, in rw_thread_init() argument
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/linux/tools/perf/pmu-events/arch/x86/amdzen4/
H A Ddata-fabric.json4 … "PublicDescription": "Read data beats (64 bytes) for local processor at Coherent Station (CS) 0.",
12 … "PublicDescription": "Read data beats (64 bytes) for local processor at Coherent Station (CS) 1.",
20 … "PublicDescription": "Read data beats (64 bytes) for local processor at Coherent Station (CS) 2.",
28 … "PublicDescription": "Read data beats (64 bytes) for local processor at Coherent Station (CS) 3.",
36 … "PublicDescription": "Read data beats (64 bytes) for local processor at Coherent Station (CS) 4.",
44 … "PublicDescription": "Read data beats (64 bytes) for local processor at Coherent Station (CS) 5.",
52 … "PublicDescription": "Read data beats (64 bytes) for local processor at Coherent Station (CS) 6.",
60 … "PublicDescription": "Read data beats (64 bytes) for local processor at Coherent Station (CS) 7.",
68 … "PublicDescription": "Read data beats (64 bytes) for local processor at Coherent Station (CS) 8.",
76 … "PublicDescription": "Read data beats (64 bytes) for local processor at Coherent Station (CS) 9.",
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/linux/Documentation/core-api/
H A Dlocal_ops.rst29 Local atomic operations are meant to provide fast and highly reentrant per CPU
34 Having fast per CPU atomic counters is interesting in many cases: it does not
40 CPU which owns the data. Therefore, care must taken to make sure that only one
41 CPU writes to the ``local_t`` data. This is done by using per cpu data and
43 however permitted to read ``local_t`` data from any CPU: it will then appear to
44 be written out of order wrt other memory writes by the owner CPU.
54 ``asm-generic/local.h`` in your architecture's ``local.h`` is sufficient.
66 * Variables touched by local ops must be per cpu variables.
67 * *Only* the CPU owner of these variables must write to them.
68 * This CPU can use local ops from any context (process, irq, softirq, nmi, ...)
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/linux/drivers/infiniband/ulp/rtrs/
H A Drtrs-clt-stats.c1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
6 * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
7 * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
12 #include "rtrs-clt.h"
16 struct rtrs_clt_path *clt_path = to_clt_path(con->c.path); in rtrs_clt_update_wc_stats()
17 struct rtrs_clt_stats *stats = clt_path->stats; in rtrs_clt_update_wc_stats()
19 int cpu; in rtrs_clt_update_wc_stats() local
21 cpu = raw_smp_processor_id(); in rtrs_clt_update_wc_stats()
22 s = get_cpu_ptr(stats->pcpu_stats); in rtrs_clt_update_wc_stats()
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H A Drtrs-srv-stats.c1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
6 * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
7 * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
12 #include "rtrs-srv.h"
17 int cpu; in rtrs_srv_reset_rdma_stats() local
20 for_each_possible_cpu(cpu) { in rtrs_srv_reset_rdma_stats()
21 r = per_cpu_ptr(stats->rdma_stats, cpu); in rtrs_srv_reset_rdma_stats()
28 return -EINVAL; in rtrs_srv_reset_rdma_stats()
33 int cpu; in rtrs_srv_stats_rdma_to_str() local
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/linux/tools/power/cpupower/utils/helpers/
H A Dsysfs.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
24 if (fd == -1) in sysfs_read_file()
27 numread = read(fd, buf, buflen - 1); in sysfs_read_file()
40 * Detect whether a CPU is online
43 * 1 -> if CPU is online
44 * 0 -> if CPU is offline
47 int sysfs_is_cpu_online(unsigned int cpu) in sysfs_is_cpu_online() argument
57 snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u", cpu); in sysfs_is_cpu_online()
64 * -> cpuX directory exists, but not cpuX/online file in sysfs_is_cpu_online()
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H A Dmsr.c1 // SPDX-License-Identifier: GPL-2.0
19 * Will return 0 on success and -1 on failure.
21 * EFAULT -If the read/write did not fully complete
22 * EIO -If the CPU does not support MSRs
23 * ENXIO -If the CPU does not exist
26 int read_msr(int cpu, unsigned int idx, unsigned long long *val) in read_msr() argument
31 sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu); in read_msr()
34 return -1; in read_msr()
35 if (lseek(fd, idx, SEEK_CUR) == -1) in read_msr()
37 if (read(fd, val, sizeof *val) != sizeof *val) in read_msr()
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/linux/drivers/perf/
H A Dfujitsu_uncore_pmu.c1 // SPDX-License-Identifier: GPL-2.0-only
5 * See Documentation/admin-guide/perf/fujitsu_uncore_pmu.rst for more details.
61 int cpu; member
72 struct uncore_pmu *uncorepmu = to_uncore_pmu(event->pmu); in fujitsu_uncore_counter_start()
73 int idx = event->hw.idx; in fujitsu_uncore_counter_start()
76 local64_set(&event->hw.prev_count, 0); in fujitsu_uncore_counter_start()
77 writeq_relaxed(0, uncorepmu->regs + PM_EVCNTR(idx)); in fujitsu_uncore_counter_start()
80 writeq_relaxed(PM_EVTYPE_EVSEL(event->attr.config), uncorepmu->regs + PM_EVTYPE(idx)); in fujitsu_uncore_counter_start()
83 writeq_relaxed(PM_INTENSET_IDX(idx), uncorepmu->regs + PM_INTENSET); in fujitsu_uncore_counter_start()
86 writeq_relaxed(PM_CNTCTL_RESET, uncorepmu->regs + PM_CNTCTL(idx)); in fujitsu_uncore_counter_start()
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/linux/include/uapi/linux/
H A Disst_if.h1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
16 * struct isst_if_platform_info - Define platform information
25 * @mmio_supported: Support of mmio interface for core-power feature
40 * struct isst_if_cpu_map - CPU mapping between logical and physical CPU
41 * @logical_cpu: Linux logical CPU number
42 * @physical_cpu: PUNIT CPU number
44 * Used to convert from Linux logical CPU to PUNIT CPU numbering scheme.
45 * The PUNIT CPU number is different than APIC ID based CPU numbering.
53 * struct isst_if_cpu_maps - structure for CPU map IOCTL
54 * @cmd_count: Number of CPU mapping command in cpu_map[]
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/linux/tools/power/cpupower/lib/
H A Dcpuidle.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
22 * For example the functionality to disable c-states was introduced in later
29 unsigned int cpuidle_state_file_exists(unsigned int cpu, in cpuidle_state_file_exists() argument
37 snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpuidle/state%u/%s", in cpuidle_state_file_exists()
38 cpu, idlestate, fname); in cpuidle_state_file_exists()
45 * helper function to read fil
51 cpuidle_state_read_file(unsigned int cpu,unsigned int idlestate,const char * fname,char * buf,size_t buflen) cpuidle_state_read_file() argument
86 cpuidle_state_write_file(unsigned int cpu,unsigned int idlestate,const char * fname,const char * value,size_t len) cpuidle_state_write_file() argument
135 cpuidle_state_get_one_value(unsigned int cpu,unsigned int idlestate,enum idlestate_value which) cpuidle_state_get_one_value() argument
175 cpuidle_state_get_one_string(unsigned int cpu,unsigned int idlestate,enum idlestate_string which) cpuidle_state_get_one_string() argument
209 cpuidle_is_state_disabled(unsigned int cpu,unsigned int idlestate) cpuidle_is_state_disabled() argument
230 cpuidle_state_disable(unsigned int cpu,unsigned int idlestate,unsigned int disable) cpuidle_state_disable() argument
253 cpuidle_state_latency(unsigned int cpu,unsigned int idlestate) cpuidle_state_latency() argument
259 cpuidle_state_residency(unsigned int cpu,unsigned int idlestate) cpuidle_state_residency() argument
265 cpuidle_state_usage(unsigned int cpu,unsigned int idlestate) cpuidle_state_usage() argument
271 cpuidle_state_time(unsigned int cpu,unsigned int idlestate) cpuidle_state_time() argument
277 cpuidle_state_name(unsigned int cpu,unsigned int idlestate) cpuidle_state_name() argument
282 cpuidle_state_desc(unsigned int cpu,unsigned int idlestate) cpuidle_state_desc() argument
292 cpuidle_state_count(unsigned int cpu) cpuidle_state_count() argument
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/linux/tools/memory-model/Documentation/
H A Dexplanation.txt1 Explanation of the Linux-Kernel Memory Consistency Model
15 7. THE PROGRAM ORDER RELATION: po AND po-loc
18 10. THE READS-FROM RELATION: rf, rfi, and rfe
20 12. THE FROM-READS RELATION: fr, fri, and fre
22 14. PROPAGATION ORDER RELATION: cumul-fence
28 20. THE HAPPENS-BEFORE RELATION: hb
29 21. THE PROPAGATES-BEFORE RELATION: pb
30 22. RCU RELATIONS: rcu-link, rcu-gp, rcu-rscsi, rcu-order, rcu-fence, and rb
31 23. SRCU READ-SIDE CRITICAL SECTIONS
39 ------------
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/linux/Documentation/
H A Dmemory-barriers.txt19 documentation at tools/memory-model/. Nevertheless, even this memory
37 Note also that it is possible that a barrier may be a no-op for an
48 - Device operations.
49 - Guarantees.
53 - Varieties of memory barrier.
54 - What may not be assumed about memory barriers?
55 - Address-dependency barriers (historical).
56 - Control dependencies.
57 - SMP barrier pairing.
58 - Examples of memory barrier sequences.
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/linux/arch/mips/include/asm/sn/sn0/
H A Dhubpi.h8 * Copyright (C) 1992 - 1997, 1999 Silicon Graphics, Inc.
28 #define PI_CPU_PROTECT 0x000000 /* CPU Protection */
29 #define PI_PROT_OVERRD 0x000008 /* Clear CPU Protection bit */
32 #define PI_CPU_NUM 0x000020 /* CPU Number ID */
57 #define PI_CPU_PRESENT_A 0x000040 /* CPU Present A */
58 #define PI_CPU_PRESENT_B 0x000048 /* CPU Present B */
59 #define PI_CPU_ENABLE_A 0x000050 /* CPU Enable A */
60 #define PI_CPU_ENABLE_B 0x000058 /* CPU Enable B */
63 #define PI_NMI_A 0x000070 /* NMI to CPU A */
64 #define PI_NMI_B 0x000078 /* NMI to CPU B */
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/linux/drivers/gpu/drm/i915/gem/selftests/
H A Di915_gem_coherency.c2 * SPDX-License-Identifier: MIT
27 u32 *cpu; in cpu_set() local
30 i915_gem_object_lock(ctx->obj, NULL); in cpu_set()
31 err = i915_gem_object_prepare_write(ctx->obj, &needs_clflush); in cpu_set()
35 page = i915_gem_object_get_page(ctx->obj, offset >> PAGE_SHIFT); in cpu_set()
36 cpu = kmap_local_page(page) + offset_in_page(offset); in cpu_set()
39 drm_clflush_virt_range(cpu, sizeof(*cpu)); in cpu_set()
41 *cpu = v; in cpu_set()
44 drm_clflush_virt_range(cpu, sizeof(*cpu)); in cpu_set()
46 kunmap_local(cpu); in cpu_set()
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/linux/tools/perf/pmu-events/arch/x86/grandridge/
H A Duncore-io.json12 …"BriefDescription": "PCIE Completion Buffer Inserts. Counts once per 64 byte read issued from thi…
24 …"BriefDescription": "PCIE Completion Buffer Inserts. Counts once per 64 byte read issued from thi…
36 …"BriefDescription": "PCIE Completion Buffer Inserts. Counts once per 64 byte read issued from thi…
48 …"BriefDescription": "PCIE Completion Buffer Inserts. Counts once per 64 byte read issued from thi…
60 …"BriefDescription": "PCIE Completion Buffer Inserts. Counts once per 64 byte read issued from thi…
72 …"BriefDescription": "PCIE Completion Buffer Inserts. Counts once per 64 byte read issued from thi…
84 …"BriefDescription": "PCIE Completion Buffer Inserts. Counts once per 64 byte read issued from thi…
96 …"BriefDescription": "PCIE Completion Buffer Inserts. Counts once per 64 byte read issued from thi…
108 …"BriefDescription": "PCIE Completion Buffer Inserts. Counts once per 64 byte read issued from thi…
228 …"BriefDescription": "Data requested by the CPU : Core reporting completion of Card read from Core …
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/linux/arch/x86/kernel/apic/
H A Dx2apic_savic.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * AMD Secure AVIC Support (SEV-SNP Guests)
12 #include <linux/percpu-defs.h>
31 static inline void *get_reg_bitmap(unsigned int cpu, unsigned int offset) in get_reg_bitmap() argument
33 return &per_cpu_ptr(savic_page, cpu)->regs[offset]; in get_reg_bitmap()
36 static inline void update_vector(unsigned int cpu, unsigned int offset, in update_vector() argument
39 void *bitmap = get_reg_bitmap(cpu, offset); in update_vector()
51 * result in #VC exception (for non-accelerated register accesses)
53 * can read/write the x2APIC register in the guest APIC backing page.
58 * the read() and write() callbacks directly read/write the APIC register
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/linux/tools/power/cpupower/utils/idle_monitor/
H A Dmperf_monitor.c1 // SPDX-License-Identifier: GPL-2.0-only
17 #include "idle_monitor/cpupower-monitor.h"
33 unsigned int cpu);
35 unsigned int cpu);
80 /* valid flag for all CPUs. If a MSR read failed it will be zero */
93 static int get_aperf_mperf(int cpu, unsigned long long *aval, in get_aperf_mperf() argument
101 * Running on the cpu from which we read the registers will in get_aperf_mperf()
106 if (bind_cpu(cpu)) in get_aperf_mperf()
124 ret = read_msr(cpu, MSR_APERF, aval); in get_aperf_mperf()
125 ret |= read_msr(cpu, MSR_MPERF, mval); in get_aperf_mperf()
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/linux/arch/arm/mach-zynq/
H A Dslcr.c1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Copyright (c) 2011-2013 Xilinx Inc.
18 #define SLCR_A9_CPU_RST_CTRL_OFFSET 0x244 /* CPU Software Reset Control */
33 * zynq_slcr_write - Write to a register in SLCR block
46 * zynq_slcr_read - Read a register in SLCR block
48 * @val: Pointer to value to be read from SLCR
59 * zynq_slcr_unlock - Unlock SLCR registers
71 * zynq_slcr_get_device_id - Read device code id
87 * zynq_slcr_system_restart - Restart the entire system.
103 * the FSBL not loading the bitstream after soft-reboot in zynq_slcr_system_restart()
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/linux/Documentation/ABI/testing/
H A Dsysfs-kernel-slab19 The aliases file is read-only and specifies how many caches
28 The align file is read-only and specifies the cache's object
37 The alloc_calls file is read-only and lists the kernel code
41 Documentation/admin-guide/mm/slab.rst).
60 The alloc_from_partial file shows how many times a cpu slab has
72 The alloc_refill file shows how many times the per-cpu freelist
74 remote cpu frees. It can be written to clear the current count.
106 The cache_dma file is read-only and specifies whether objects
116 The cpu_slabs file is read-only and displays how many cpu slabs
125 The file cpuslab_flush shows how many times a cache's cpu slabs
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/linux/kernel/rcu/
H A Dtree_plugin.h1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Read-Copy Update mechanism for mutual exclusion (tree-based version)
4 * Internal non-public definitions that provide either classic
19 * In order to read the offloaded state of an rdp in a safe in rcu_rdp_is_offloaded()
21 * under us, we must either hold the barrier mutex, the cpu in rcu_rdp_is_offloaded()
22 * hotplug lock (read o in rcu_rdp_is_offloaded()
872 int cpu; dump_blkd_tasks() local
1115 rcu_cpu_kthread_setup(unsigned int cpu) rcu_cpu_kthread_setup() argument
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/linux/kernel/trace/
H A Dring_buffer.c1 // SPDX-License-Identifier: GPL-2.0
28 #include <linux/cpu.h>
90 * allocated for each CPU. A writer may only write to a buffer that is
91 * associated with the CPU it is currently executing on. A reader may read
92 * from any per cpu buffer.
94 * The reader is special. For each per cpu buffer, the reader has its own
95 * reader page. When a reader has read the entire reader page, this reader
104 * +------+
107 * +------+ +---+ +---+ +---+
108 * | |-->| |-->| |
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/linux/Documentation/mm/
H A Dmmu_notifier.rst8 For secondary TLB (non CPU TLB) like IOMMU TLB or device TLB (when device use
9 thing like ATS/PASID to get the IOMMU to walk the CPU page table to access a
23 - take page table lock
24 - clear page table entry and notify ([pmd/pte]p_huge_clear_flush_notify())
25 - set page table entry to point to new page
33 Two address addrA and addrB such that \|addrA - addrB\| >= PAGE_SIZE we assume
38 [Time N] --------------------------------------------------------------------
39 CPU-thread-0 {try to write to addrA}
40 CPU-thread-1 {try to write to addrB}
41 CPU-thread-2 {}
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/linux/include/clocksource/
H A Dhyperv_timer.h1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Definitions for the clocksource provided by the Hyper-V
5 * hypervisor to guest VMs, as described in the Hyper-V Top
29 extern int hv_stimer_cleanup(unsigned int cpu);
30 extern void hv_stimer_legacy_init(unsigned int cpu, int sint);
31 extern void hv_stimer_legacy_cleanup(unsigned int cpu);
51 * The protocol for reading Hyper-V TSC page is specified in Hypervisor in hv_read_tsc_page_tsc()
52 * Top-Level Functional Specification ver. 3.0 and above. To get the in hv_read_tsc_page_tsc()
54 * - READ ReferenceTscSequence in hv_read_tsc_page_tsc()
57 * versions (up to 4.0b) contain a mistake and wrongly claim '-1' in hv_read_tsc_page_tsc()
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