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/linux/Documentation/devicetree/bindings/arm/
H A Darm,trace-buffer-extension.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
4 ---
5 $id: http://devicetree.org/schemas/arm/arm,trace-buffer-extension.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: ARM Trace Buffer Extensions
11 - Anshuman Khandual <anshuman.khandual@arm.com>
14 Arm Trace Buffer Extension (TRBE) is a per CPU component
15 for storing trace generated on the CPU to memory. It is
26 - const: arm,trace-buffer-extension
32 the arm,gic-v3 binding for details on describing a PPI partition.
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/linux/Documentation/trace/coresight/
H A Dcoresight-trbe.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Trace Buffer Extension (TRBE).
11 --------------------
13 Trace Buffer Extension (TRBE) is a percpu hardware which captures in system
15 gets plugged in as a coresight sink device because the corresponding trace
23 ---------------------------
36 *Key file items are:-*
/linux/Documentation/devicetree/bindings/perf/
H A Dspe-pmu.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/perf/spe-pmu.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: ARMv8.2 Statistical Profiling Extension (SPE) Performance Monitor Units (PMU)
10 - Will Deacon <will@kernel.org>
13 ARMv8.2 introduces the optional Statistical Profiling Extension for collecting
14 performance sample data using an in-memory trace buffer.
18 const: arm,statistical-profiling-extension-v1
24 supported on a subset of the CPUs, please consult the arm,gic-v3 binding
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/linux/arch/arm64/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
287 ARM 64-bit (AArch64) Linux support.
295 # required due to use of the -Zfixed-x18 flag.
298 # -Zsanitizer=shadow-call-stack flag.
308 depends on $(cc-option,-fpatchable-function-entry=2)
334 # VA_BITS - PTDESC_TABLE_SHIFT
412 def_bool !$(as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n)
417 # https://github.com/llvm/llvm-project/commit/2a96f47c5ffca84cd774ad402cacd137f4bf45e2
467 at stage-2.
492 …bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is acce…
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/linux/arch/arm64/boot/dts/arm/
H A Dfvp-base-revc.dts1 // SPDX-License-Identifier: GPL-2.0
5 * Architecture Envelope Model (AEM) ARMv8-A
11 /dts-v1/;
13 #include <dt-bindings/interrupt-controller/arm-gic.h>
17 #include "rtsm_ve-motherboard.dtsi"
18 #include "rtsm_ve-motherboard-rs2.dtsi"
22 compatible = "arm,fvp-base-revc", "arm,vexpress";
23 interrupt-parent = <&gic>;
24 #address-cells = <2>;
25 #size-cells = <2>;
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/linux/Documentation/mm/
H A Dpage_owner.rst17 to enlarge the trace buffer for preventing overlapping until userspace
18 program launched. And, launched program continually dump out the trace
19 buffer for later analysis and it would change system behaviour with more
50 stores information into the memory from struct page extension. This memory
57 more accurately. On 2GB memory x86-64 VM box, 13343 early allocated pages
59 page extension feature. Anyway, after that, no page is left in
60 un-tracking state.
65 1) Build user-space helper::
149 If you want to sort by the page nums of buf, use the ``-m`` parameter.
155 -a Sort by memory allocation time.
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/linux/tools/include/perf/
H A Darm_pmuv3.h1 /* SPDX-License-Identifier: GPL-2.0 */
13 #define ARMV8_PMU_COUNTER_MASK (ARMV8_PMU_MAX_COUNTERS - 1)
83 /* Statistical profiling extension microarchitectural events */
93 /* long-latency read miss events */
99 /* Trace buffer events */
103 /* Trace unit events */
118 /* Armv8.5 Memory Tagging Extension events */
211 * Per-CPU PMCR: config reg
218 #define ARMV8_PMU_PMCR_DP (1 << 5) /* Disable CCNT if non-invasive debug*/
/linux/include/linux/perf/
H A Darm_pmuv3.h1 /* SPDX-License-Identifier: GPL-2.0 */
81 /* Statistical profiling extension microarchitectural events */
91 /* long-latency read miss events */
97 /* Trace buffer events */
101 /* Trace unit events */
116 /* Armv8.5 Memory Tagging Extension events */
209 * Per-CPU PMCR: config reg
216 #define ARMV8_PMU_PMCR_DP (1 << 5) /* Disable CCNT if non-invasive debug*/
/linux/drivers/hwtracing/coresight/
H A Dcoresight-trbe.h1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Trace Buffer Extension (TRBE) driver in the coresight framework.
20 #include "coresight-etm-perf.h"
/linux/sound/soc/sof/
H A Dipc4-mtrace.c1 // SPDX-License-Identifier: GPL-2.0-only
9 #include "sof-priv.h"
10 #include "ipc4-priv.h"
15 * ------------------------
16 * | Page0 - descriptors |
17 * ------------------------
18 * | Page1 - slot0 |
19 * ------------------------
20 * | Page2 - slot1 |
21 * ------------------------
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/linux/arch/arm/mm/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
17 A 32-bit RISC microprocessor based on the ARM7 processor core
36 A 32-bit RISC processor with 8kByte Cache, Write Buffer and
53 A 32-bit RISC processor with 8KB cache or 4KB variants,
54 write buffer and MPU(Protection Unit) built around
69 A 32-bit RISC microprocessor based on the ARM9 processor core
166 Branch Target Buffer, Unified TLB and cache line size 16.
182 ARM940T is a member of the ARM9TDMI family of general-
184 instruction and 4KB data cases, each with a 4-word line
190 # ARM946E-S
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/linux/drivers/perf/
H A Darm_spe_pmu.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * Perf support for the Statistical Profiling Extension, introduced as
43 * Cache if the event is allowed to trace Context information.
54 event->hw.flags |= SPE_PMU_HW_FLAGS_CX; in set_spe_event_has_cx()
59 return !!(event->hw.flags & SPE_PMU_HW_FLAGS_CX); in get_spe_event_has_cx()
101 /* Convert a free-running index from perf into an SPE buffer offset */
103 ((idx) % ((unsigned long)(buf)->nr_pages << PAGE_SHIFT))
132 return !!(spe_pmu->features & arm_spe_pmu_feat_caps[cap]); in arm_spe_pmu_cap_get()
136 return spe_pmu->counter_sz; in arm_spe_pmu_cap_get()
138 return spe_pmu->min_period; in arm_spe_pmu_cap_get()
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/linux/tools/include/uapi/linux/
H A Dperf_event.h1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
5 * Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
6 * Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
7 * Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra
13 * For licencing details see kernel-base/COPYING
23 * User-space ABI bits:
37 PERF_TYPE_MAX, /* non-ABI */
78 PERF_COUNT_HW_MAX, /* non-ABI */
84 * { L1-D, L1-I, LLC, ITLB, DTLB, BPU, NODE } x
97 PERF_COUNT_HW_CACHE_MAX, /* non-ABI */
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/linux/lib/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
31 converting bitfields between a CPU-usable representation and a
33 - Is little endian (bytes are reversed within a 32-bit group)
34 - The least-significant 32-bit word comes first (within a 64-bit
36 - The most significant bit of a byte is at its right (bit 0 of a
51 please refer to the KUnit documentation in Documentation/dev-tools/kunit/.
62 This option enables the use of hardware bit-reversal instructions on
102 bool "Access I/O in non-MMIO mode"
108 mechanism, the host-local I/O resource can be mapped into system
110 system can access the I/O devices with the mapped-logic PIO through
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/linux/drivers/virt/coco/guest/
H A Dtsm-mr.c1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright(c) 2024-2025 Intel Corporation. All rights reserved. */
11 #include <trace/events/tsm_mr.h>
14 * struct tm_context - contains everything necessary to implement sysfs
19 * @in_sync: %true if MR cache is up-to-date.
25 * Given tm->refresh() is potentially expensive, tm_digest_read() caches MR
26 * values and calls tm->refresh() only when necessary. Only live MRs (i.e., with
27 * %TSM_MR_F_LIVE set) can trigger tm->refresh(), while others are assumed to
28 * retain their values from the last tm->write(). @in_sync tracks if there have
29 * been tm->write() calls since the last tm->refresh(). That is, tm->refresh()
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/linux/include/net/9p/
H A D9p.h1 /* SPDX-License-Identifier: GPL-2.0-only */
14 * enum p9_debug_flags - bits for mount time debug parameter
19 * @P9_DEBUG_MUX: trace management of concurrent transactions
25 * @P9_DEBUG_FSC: FS-cache tracing
62 * enum p9_msg_t - 9P message types
112 * See Also: http://plan9.bell-labs.com/sys/man/5/INDEX.html
187 * enum p9_open_mode_t - 9P open modes
192 * @P9_OTRUNC: truncate file to zero-length before opening it
205 * See Also: http://plan9.bell-labs.com/magic/man2html/2/open
225 * enum p9_perm_t - 9P permissions
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/linux/Documentation/filesystems/
H A D9p.rst1 .. SPDX-License-Identifier: GPL-2.0
26 http://xcpu.org/papers/xcpu-talk.pdf
30 http://xcpu.org/papers/cellfs-talk.pdf
33 * VirtFS: A Virtualization Aware File System pass-through
34 https://kernel.org/doc/ols/2010/ols2010-pages-109-120.pdf
41 mount -t 9p 10.10.1.2 /mnt/9
45 mount -t 9p `namespace`/acme /mnt/9 -o trans=unix,uname=$USER
49 mount -t 9p -o trans=virtio <mount_tag> /mnt/9
61 mount -t 9p -o trans=usbg,aname=/path/to/fs <device> /mnt/9
89 Just start the 9pfs capable network server like diod/nfs-ganesha e.g.::
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H A Drelay.rst1 .. SPDX-License-Identifier: GPL-2.0
9 to userspace via user-defined 'relay channels'.
11 A 'relay channel' is a kernel->user data relay mechanism implemented
12 as a set of per-cpu kernel buffers ('channel buffers'), each
16 buffer. User space applications mmap() or read() from the relay files
24 buffer data. The relay interface doesn't implement any form of data
25 filtering - this also is left to the kernel client. The purpose is to
30 functions in the relay interface code - please see that for details.
35 Each relay channel has one buffer per CPU; each buffer has one or more
36 sub-buffers. Messages are written to the first sub-buffer until it is
[all …]
/linux/net/9p/
H A Dprotocol.c1 // SPDX-License-Identifier: GPL-2.0-only
24 #include <trace/events/9p.h>
31 * p9_msg_buf_size - Returns a buffer size sufficiently large to hold the
53 c->proto_version == p9_proto_2000L ? rlerror_size : rerror_size; in p9_msg_buf_size()
106 if (c->proto_version == p9_proto_legacy) { in p9_msg_buf_size()
114 /* fid[4] name[s] perm[4] mode[1] extension[s] */ in p9_msg_buf_size()
198 kfree(stbuf->name); in p9stat_free()
199 stbuf->name = NULL; in p9stat_free()
200 kfree(stbuf->uid); in p9stat_free()
201 stbuf->uid = NULL; in p9stat_free()
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/linux/net/ipv6/
H A Dexthdrs.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Extension Header handling for IPv6
16 * YOSHIFUJI Hideaki @USAGI Register inbound extension header
90 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) in ip6_tlvopt_unknown()
112 /* Parse tlv encoded option header (hop-by-hop or destination) */
127 max_count = -max_count; in ip6_parse_tlv()
131 len -= 2; in ip6_parse_tlv()
141 len--; in ip6_parse_tlv()
216 len -= optlen; in ip6_parse_tlv()
239 if (opt->dsthao) { in ipv6_dest_hao()
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/linux/kernel/bpf/
H A Dlog.c1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
19 if (!!log->ubuf != !!log->len_total) in bpf_verifier_log_attr_valid()
22 if (log->ubuf && log->level == 0) in bpf_verifier_log_attr_valid()
24 if (log->leve in bpf_verifier_log_attr_valid()
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/linux/net/rds/
H A Drds.h1 /* SPDX-License-Identifier: GPL-2.0 */
56 /* Used to limit both RDMA and non-RDMA RDS message to 1MB */
96 #define RDS_MPATH_HASH(rs, n) (jhash_1word(ntohs((rs)->rs_bound_port), \
97 (rs)->rs_hash_initval) & ((n) - 1))
176 return read_pnet(&conn->c_net); in rds_conn_net()
182 write_pnet(&conn->c_net, net); in rds_conn_net_set()
202 * Maximum space available for extension header
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/linux/drivers/ata/
H A Dpata_octeon_cf.c8 * Copyright (C) 2005 - 2012 Cavium Inc.
23 #include <trace/events/libata.h>
31 * -- 8 bits no irq, no DMA
32 * -- 16 bits no irq, no DMA
33 * -- 16 bits True IDE mode with DMA, but no irq.
110 reg_cfg.s.we_ext = 0; /* No write enable extension */ in octeon_cf_set_boot_reg_cfg()
111 reg_cfg.s.oe_ext = 0; /* No read enable extension */ in octeon_cf_set_boot_reg_cfg()
128 struct octeon_cf_port *cf_port = ap->private_data; in octeon_cf_set_piomode()
150 BUG_ON(ata_timing_compute(dev, dev->pio_mode, &timing, T, T)); in octeon_cf_set_piomode()
154 t2--; in octeon_cf_set_piomode()
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/linux/drivers/net/wireless/broadcom/brcm80211/brcmfmac/
H A Dbcdc.c1 // SPDX-License-Identifier: ISC
44 * BCDC header - Broadcom specific extension of CDC.
58 ((int)((((hdr)->flags2) & BCDC_FLAG2_IF_MASK) >> BCDC_FLAG2_IF_SHIFT))
60 ((hdr)->flags2 = (((hdr)->flags2 & ~BCDC_FLAG2_IF_MASK) | \
64 * struct brcmf_proto_bcdc_header - BCDC header format
103 struct brcmf_bcdc *bcdc = drvr->proto->pd; in drvr_to_fws()
105 return bcdc->fws; in drvr_to_fws()
112 struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd; in brcmf_proto_bcdc_msg()
113 struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg; in brcmf_proto_bcdc_msg()
120 msg->cmd = cpu_to_le32(cmd); in brcmf_proto_bcdc_msg()
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/linux/Documentation/admin-guide/
H A Dkernel-parameters.txt16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nocmcff -- Disable firmware first mode for corrected
28 nospcr -- disable console in ACPI SPCR table as
45 If set to vendor, prefer vendor-specific driver
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