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/linux-6.8/drivers/cpufreq/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
16 <file:Documentation/admin-guide/pm/cpufreq.rst>.
41 default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if (X86_INTEL_PSTATE || X86_AMD_PSTATE) && SMP
74 depends on !(X86_INTEL_PSTATE && SMP)
79 you to get a full dynamic frequency capable system by simply
80 loading your cpufreq low-level hardware driver.
87 depends on !(X86_INTEL_PSTATE && SMP)
92 you to get a full dynamic frequency capable system by simply
93 loading your cpufreq low-level hardware driver.
100 depends on SMP
[all …]
DKconfig.x861 # SPDX-License-Identifier: GPL-2.0-only
12 select CPU_FREQ_GOV_SCHEDUTIL if SMP
30 <file:Documentation/admin-guide/pm/cpufreq_drivers.rst>.
33 module will be called pcc-cpufreq.
38 bool "AMD Processor P-State driver"
42 select CPU_FREQ_GOV_SCHEDUTIL if SMP
50 <file:Documentation/admin-guide/pm/amd-pstate.rst>.
55 int "AMD Processor P-State default mode"
60 Select the default mode the amd-pstate driver will use on
63 1 -> Disabled
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/linux-6.8/Documentation/devicetree/bindings/sram/
Dsram.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Generic on-chip SRAM
10 - Rob Herring <robh@kernel.org>
19 Following the generic-names recommended practice, node names should
30 - mmio-sram
31 - amlogic,meson-gxbb-sram
32 - arm,juno-sram-ns
33 - atmel,sama5d2-securam
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/linux-6.8/arch/parisc/
DKconfig1 # SPDX-License-Identifier: GPL-2.0
43 select GENERIC_ARCH_TOPOLOGY if SMP
44 select GENERIC_CPU_DEVICES if !SMP
69 select GENERIC_IRQ_MIGRATION if SMP
70 select HAVE_UNSTABLE_SCHED_CLOCK if SMP
79 select HAVE_DYNAMIC_FTRACE if $(cc-option,-fpatchable-function-entry=1,1)
89 The PA-RISC microprocessor is designed by Hewlett-Packard and used
91 and later HP3000 series). The PA-RISC Linux project home page is
106 depends on SMP && PREEMPTION
134 depends on SMP
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/linux-6.8/arch/mips/include/asm/
Dtimex.h17 #include <asm/cpu-features.h>
19 #include <asm/cpu-type.h>
31 * Currently only used on SMP for scheduling.
37 * We know that all SMP capable CPUs have cycle counters.
82 * Like get_cycles - but where c0_count is not available we desperately
96 return (random_get_entropy_fallback() << 6) | (0x3f - c0_random); in random_get_entropy()
/linux-6.8/drivers/cpuidle/
DKconfig.arm1 # SPDX-License-Identifier: GPL-2.0-only
13 at run-time through DT nodes. The CPUidle suspend backend is
24 It provides an idle driver that is capable of detecting and
28 - If the idle states are described with the non-hierarchical layout,
31 - If the idle states are described with the hierarchical layout,
56 define different C-states for little and big cores through the
85 bool "Cpu Idle Driver for the ST-E u8500 processors"
88 Select this to enable cpuidle for ST-E u8500 processors.
100 select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP
114 select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP
/linux-6.8/arch/arm/mach-omap2/
Domap-smp.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * OMAP4 SMP source file. It contains platform specific functions
4 * needed for the linux smp kernel.
11 * Platform file needed for the OMAP4 SMP. This file is based on arm
12 * realview smp platform.
17 #include <linux/smp.h>
19 #include <linux/irqchip/arm-gic.h>
25 #include "omap-secure.h"
26 #include "omap-wakeupgen.h"
87 * BIT(27) - Disables streaming. All write-allocate lines allocate in in omap5_erratum_workaround_801819()
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/linux-6.8/arch/arm/mach-exynos/
Dexynos.c1 // SPDX-License-Identifier: GPL-2.0
5 // Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
15 #include <linux/soc/samsung/exynos-regs-pmu.h>
18 #include <asm/hardware/cache-l2x0.h>
33 .id = -1,
52 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") { in exynos_sysram_init()
64 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") { in exynos_sysram_init()
80 if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid")) in exynos_fdt_map_chipid()
88 iodesc.length = be32_to_cpu(reg[1]) - 1; in exynos_fdt_map_chipid()
110 * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
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/linux-6.8/arch/xtensa/
DKconfig1 # SPDX-License-Identifier: GPL-2.0
58 Xtensa processors are 32-bit RISC machines designed by Tensilica
63 a home page at <http://www.linux-xtensa.org/>.
102 def_bool $(success,test "$(shell,echo __XTENSA_EB__ | $(CC) -E -P -)" = 1)
108 …def_bool $(success,test "$(shell,echo __XTENSA_CALL0_ABI__ | $(CC) -mabi=call0 -E -P - 2>/dev/null…
117 bool "fsf - default (not generic) configuration"
121 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
128 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
164 ie: it supports a TLB with auto-loading, page protection.
221 byte and 2-byte access to memory attached to instruction bus.
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/linux-6.8/arch/sh/
DKconfig1 # SPDX-License-Identifier: GPL-2.0
81 <http://www.linux-sh.org/>.
95 depends on SMP && PREEMPTION
213 prompt "Processor sub-type selection"
219 # SH-2 Processor Support
230 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
232 # SH-2A Processor Support
278 bool "Support MX-G processor"
282 Select MX-G if running on an R8A03022BG part.
284 # SH-3 Processor Support
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/linux-6.8/net/unix/
Dscm.c1 // SPDX-License-Identifier: GPL-2.0
30 if (S_ISSOCK(inode->i_mode) && !(filp->f_mode & FMODE_PATH)) { in unix_get_socket()
32 const struct proto_ops *ops = READ_ONCE(sock->ops); in unix_get_socket()
33 struct sock *s = sock->sk; in unix_get_socket()
36 if (s && ops && ops->family == PF_UNIX) in unix_get_socket()
56 if (atomic_long_inc_return(&u->inflight) == 1) { in unix_inflight()
57 BUG_ON(!list_empty(&u->link)); in unix_inflight()
58 list_add_tail(&u->link, &gc_inflight_list); in unix_inflight()
60 BUG_ON(list_empty(&u->link)); in unix_inflight()
65 WRITE_ONCE(user->unix_inflight, user->unix_inflight + 1); in unix_inflight()
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/linux-6.8/arch/arm64/kernel/
Dhyp-stub.S1 /* SPDX-License-Identifier: GPL-2.0-only */
35 ventry elx_sync // Synchronous 64-bit EL1
36 ventry el1_irq_invalid // IRQ 64-bit EL1
37 ventry el1_fiq_invalid // FIQ 64-bit EL1
38 ventry el1_error_invalid // Error 64-bit EL1
40 ventry el1_sync_invalid // Synchronous 32-bit EL1
41 ventry el1_irq_invalid // IRQ 32-bit EL1
42 ventry el1_fiq_invalid // FIQ 32-bit EL1
43 ventry el1_error_invalid // Error 32-bit EL1
68 /* Someone called kvm_call_hyp() against the hyp-stub... */
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/linux-6.8/arch/powerpc/kvm/
DKconfig1 # SPDX-License-Identifier: GPL-2.0
50 depends on PPC_BOOK3S_32 && !SMP && !PTE_64BIT
120 processor, including emulating 32-bit processors on a 64-bit
146 bool "Detailed timing for hypervisor real-mode code (for POWER8)"
150 Calculate time taken for each vcpu in the real-mode guest entry,
155 kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40
165 Old nested HV capable Linux guests have a bug where they don't
166 reflect the PMU in-use status of their L2 guest to the L0 host
173 in all nested-capable guest entry/exit.
182 Calculate elapsed time for every exit/enter cycle. A per-vcpu
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/linux-6.8/arch/powerpc/platforms/
DKconfig.cputype1 # SPDX-License-Identifier: GPL-2.0
7 bool "64-bit kernel"
10 This option selects whether a 32-bit or a 64-bit kernel
282 default "-mtune=power10" if $(cc-option,-mtune=power10)
283 default "-mtune=power9" if $(cc-option,-mtune=power9)
284 default "-mtune=power8" if $(cc-option,-mtune=power8)
366 This option enables kernel support for larger than 32-bit physical
371 is platform-dependent.
387 any affect on a non-altivec cpu (it does, however add code to the
403 VSX (P7 and above), but does not have any affect on a non-VSX
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/linux-6.8/arch/x86/
DKconfig1 # SPDX-License-Identifier: GPL-2.0
4 bool "64-bit kernel" if "$(ARCH)" = "x86"
7 Say yes to build a 64-bit kernel - formerly known as x86_64
8 Say no to build a 32-bit kernel - formerly known as i386
13 # Options that are inherently 32-bit kernel only:
27 # Options that are inherently 64-bit kernel only:
53 # ported to 32-bit as well. )
143 # Word-size accesses may read uninitialized data past the trailing \0
158 select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP
160 select GENERIC_IRQ_MIGRATION if SMP
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/linux-6.8/arch/powerpc/include/asm/
Dmpic_msgr.h1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright 2011-2012, Meador Inge, Mentor Graphics Corporation.
11 #include <asm/smp.h>
69 * The given 32-bit message is written to the given message
75 out_be32(msgr->base, message); in mpic_msgr_write()
82 * Returns the 32-bit value currently in the given message register.
88 return in_be32(msgr->base); in mpic_msgr_read()
113 out_be32(msgr->base, 1 << get_hard_smp_processor_id(cpu_num)); in mpic_msgr_set_destination()
120 * 0 is returned if this message register is not capable of receiving
126 return msgr->irq; in mpic_msgr_get_irq()
/linux-6.8/arch/arm/mach-mstar/
Dmstarv7.c1 // SPDX-License-Identifier: GPL-2.0
17 * In the u-boot code the area these registers are in is
22 * for both u-boot and linux share calls to "flush the miu pipe".
24 * the state is right before DMA capable devices try to read
85 return -EINVAL; in mstarv7_boot_secondary()
91 return -ENODEV; in mstarv7_boot_secondary()
128 .smp = smp_ops(mstarv7_smp_ops),
/linux-6.8/arch/x86/kernel/
Dvsmp_64.c1 // SPDX-License-Identifier: GPL-2.0-only
15 #include <linux/smp.h>
19 #include <asm/pci-direct.h>
32 /* set vSMP magic bits to indicate vSMP capable kernel */ in set_vsmp_ctl()
58 static int is_vsmp = -1;
75 if (is_vsmp != -1) in is_vsmp_box()
121 maxcpus = (topology & ((1 << node_shift) - 1)) + 1; in vsmp_cap_cpus()
138 apic->phys_pkg_id = apicid_phys_pkg_id; in vsmp_apic_post_init()
Dmsr.c1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* ----------------------------------------------------------------------- *
4 * Copyright 2000-2008 H. Peter Anvin - All Rights Reserved
7 * ----------------------------------------------------------------------- */
17 * an SMP box will direct the access to CPU %d.
29 #include <linux/smp.h>
63 return -EINVAL; /* Invalid chunk size */ in msr_read()
65 for (; count; count -= 8) { in msr_read()
70 err = -EFAULT; in msr_read()
86 * It's possible to be smarter here and do it (for example) per-MSR, but in filter_write()
[all …]
/linux-6.8/arch/arm/
DKconfig1 # SPDX-License-Identifier: GPL-2.0
61 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
62 select GENERIC_IRQ_IPI if SMP
123 select MMU_GATHER_RCU_TABLE_FREE if SMP && ARM_LPAE
152 The ARM series is a line of low-power-consumption RISC chip designs
154 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
155 manufactured, but legacy ARM-based PC hardware remains popular in
166 supported in LLD until version 14. The combined range is -/+ 256 MiB,
259 Patch phys-to-virt and virt-to-phys translation functions at
263 This can only be used with non-XIP MMU kernels where the base
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/linux-6.8/Documentation/admin-guide/
Dtainted-kernels.rst2 ---------------
16 ('kernel oops') or a non-recoverable error ('kernel panic') and writes debug
29 Oops: 0002 [#1] SMP PTI
30 CPU: 0 PID: 4424 Comm: insmod Tainted: P W O 4.20.0-0.rc6.fc30 #1
43 a warning occurred (``W``), and an externally-built module was loaded (``O``).
53 decode that number is the script ``tools/debugging/kernel-chktaint``, which your
54 distribution might ship as part of a package called ``linux-tools`` or
55 ``kernel-tools``; if it doesn't you can download the script from
56 …git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/tools/debugging/kernel-chktaint>`_
57 and execute it with ``sh kernel-chktaint``, which would print something like
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/linux-6.8/Documentation/core-api/
Dgenericirq.rst7 :Copyright: |copy| 2005-2010: Thomas Gleixner
8 :Copyright: |copy| 2005-2006: Ingo Molnar
29 __do_IRQ() super-handler, which is able to deal with every type of
36 - Level type
38 - Edge type
40 - Simple type
44 - Fast EOI type
46 In the SMP world of the __do_IRQ() super-handler another type was
49 - Per CPU type
51 This split implementation of high-level IRQ handlers allows us to
[all …]
/linux-6.8/kernel/time/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
21 # cycle update - x86/TSC misfeature
33 # Architecture can handle broadcast in a driver-agnostic way
113 will only trigger on an as-needed basis when the system is idle.
122 depends on SMP
139 the expense of some overhead in user <-> kernel transitions:
163 The major pre-requirement for full dynticks to work is to
196 hardware is not capable then this option only increases
207 The default is based on a half-second clocksource watchdog
/linux-6.8/arch/alpha/kernel/
Dsmp.c1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/alpha/kernel/smp.c
5 * 2001-07-09 Phil Ezolt (Phillip.Ezolt@compaq.com)
22 #include <linux/smp.h>
53 /* A collection of per-processor data. */
77 * per-processor storage.
89 * Ideally sets up per-cpu profiling hooks. Doesn't do much now...
141 /* Call platform-specific callin, if specified */ in smp_callin()
147 current->active_mm = &init_mm; in smp_callin()
167 cpuid, current, current->active_mm)); in smp_callin()
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/linux-6.8/arch/powerpc/
DKconfig1 # SPDX-License-Identifier: GPL-2.0
5 def_bool PPC64 && $(cc-option, -mabi=elfv2)
8 def_bool PPC64 && $(cc-option, -mcpu=power10 -mprefixed)
11 # Clang has a bug (https://github.com/llvm/llvm-project/issues/62372)
12 # where pcrel code is not generated if -msoft-float, -mno-altivec, or
13 # -mno-vsx options are also given. Without these options, fp/vec
16 def_bool PPC64 && CC_IS_GCC && $(cc-option, -mcpu=power10 -mpcrel)
35 # On Book3S 64, the default virtual address space for 64-bit processes
38 # between bottom-up and top-down allocations for applications that
41 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
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