| /linux/Documentation/admin-guide/mm/ |
| H A D | numa_memory_policy.rst | 2 NUMA Memory Policy
5 What is NUMA Memory Policy?
8 In the Linux kernel, "memory policy" determines from which node the kernel will
9 allocate memory in a NUMA system or in an emulated NUMA system. Linux has
10 supported platforms with Non-Uniform Memory Access architectures since 2.4.?.
11 The current memory policy support was added to Linux 2.6 around May 2004. This
12 document attempts to describe the concepts and APIs of the 2.6 memory policy
15 Memory policies should not be confused with cpusets
16 (``Documentation/admin-guide/cgroup-v1/cpusets.rst``)
18 memory may be allocated by a set of processes. Memory policies are a
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| H A D | nommu-mmap.rst | 2 No-MMU memory mapping support
5 The kernel has limited support for memory mapping under no-MMU conditions, such
6 as are used in uClinux environments. From the userspace point of view, memory
12 Memory mapping behaviour also involves the way fork(), vfork(), clone() and
16 The behaviour is similar between the MMU and no-MMU cases, but not identical;
21 In the MMU case: VM regions backed by arbitrary pages; copy-on-write
24 In the no-MMU case: VM regions backed by arbitrary contiguous runs of
30 shared across fork() or clone() without CLONE_VM in the MMU case. Since
31 the no-MMU case doesn't support these, behaviour is identical to
39 In the no-MMU case:
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| /linux/include/uapi/linux/ |
| H A D | tee.h | 2 * Copyright (c) 2015-2016, Linaro Limited
49 #define TEE_GEN_CAP_REG_MEM (1 << 2)/* Supports registering shared memory */
53 #define TEE_MEMREF_NULL ((__u64)(-1)) /* NULL MemRef Buffer */
54 #define TEE_OBJREF_NULL ((__u64)(-1)) /* NULL ObjRef Object */
65 * OP-TEE specific capabilities
70 * struct tee_ioctl_version_data - TEE version
86 * TEE_IOC_VERSION - query version of TEE
95 * struct tee_ioctl_shm_alloc_data - Shared memory allocate argument
96 * @size: [in/out] Size of shared memory to allocate
98 * @id: [out] Identifier of the shared memory
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| H A D | um_timetravel.h | 1 /* SPDX-License-Identifier: BSD-3-Clause */
3 * Copyright (C) 2019 - 2023 Intel Corporation
10 * struct um_timetravel_msg - UM time travel message
14 * This is the message passed between the host (user-mode Linux instance)
30 * @seq: sequence number for the message - shall be reflected in
46 * enum um_timetravel_shared_mem_fds - fds sent in ACK message for START message
50 * @UM_TIMETRAVEL_SHARED_MEMFD: Index of the shared memory file
63 * enum um_timetravel_start_ack - ack-time mask for start message
73 * enum um_timetravel_ops - Operation codes
79 * unless otherwise specified below, note: while using shared
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| /linux/drivers/tee/ |
| H A D | tee_shm.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2015-2017, 2019-2021 Linaro Limited
7 #include <linux/dma-buf.h>
8 #include <linux/dma-mapping.h>
44 if (shm->pages) { in release_registered_pages()
45 if (shm->flags & TEE_SHM_USER_MAPPED) in release_registered_pages()
46 unpin_user_pages(shm->pages, shm->num_pages); in release_registered_pages()
48 shm_put_kernel_pages(shm->pages, shm->num_pages); in release_registered_pages()
50 kfree(shm->pages); in release_registered_pages()
58 if (shm->flags & TEE_SHM_DMA_MEM) { in tee_shm_release()
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| /linux/Documentation/devicetree/bindings/reserved-memory/ |
| H A D | xen,shared-memory.txt | 1 * Xen hypervisor reserved-memory binding
3 Expose one or more memory regions as reserved-memory to the guest
5 to be a shared memory area across multiple virtual machines for
8 For each of these pre-shared memory regions, a range is exposed under
9 the /reserved-memory node as a child node. Each range sub-node is named
10 xen-shmem@<address> and has the following properties:
12 - compatible:
13 compatible = "xen,shared-memory-v1"
15 - reg:
16 the base guest physical address and size of the shared memory region
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| H A D | qcom,cmd-db.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/reserved-memory/qcom,cmd-db.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
12 is stored in a shared memory region and is loaded by the remote processor.
15 controlling shared resources. Depending on the board configuration the shared
17 remote processor and made available in the shared memory.
20 - Bjorn Andersson <bjorn.andersson@linaro.org>
23 - $ref: reserved-memory.yaml
27 const: qcom,cmd-db
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| /linux/tools/testing/selftests/kvm/x86/ |
| H A D | private_mem_conversions_test.c | 1 // SPDX-License-Identifier: GPL-2.0
29 /* Horrific macro so that the line info is captured accurately :-( */
52 * Run memory conversion tests with explicit conversion:
54 * to back/unback private memory. Subsequent accesses by guest to the gpa range
57 * Test memory conversion scenarios with following steps:
58 * 1) Access private memory using private access and verify that memory contents
60 * 2) Convert memory to shared using explicit conversions and ensure that
61 * userspace is able to access the shared regions.
62 * 3) Convert memory back to private using explicit conversions and ensure that
129 /* Memory should be shared by default. */ in guest_test_explicit_conversion()
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| /linux/Documentation/userspace-api/ |
| H A D | unshare.rst | 10 ----------
14 --------
26 -----------
37 outside the confinement of all-or-nothing shared resources of legacy
44 shared at the time of their creation. unshare() was conceptualized by
45 Al Viro in the August of 2000, on the Linux-Kernel mailing list, as part
48 shared resources without creating a new process. unshare() is a natural
53 -----------
57 resources is not possible. Since namespaces are shared by default
59 even non-threaded applications if they have a need to disassociate
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| /linux/drivers/net/ipa/ |
| H A D | ipa_qmi_msg.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Copyright (C) 2018-2024 Linaro Ltd.
18 #define IPA_QMI_INDICATION_REGISTER 0x20 /* modem -> AP request */
19 #define IPA_QMI_INIT_DRIVER 0x21 /* AP -> modem request */
20 #define IPA_QMI_INIT_COMPLETE 0x22 /* AP -> modem indication */
21 #define IPA_QMI_DRIVER_INIT_COMPLETE 0x35 /* modem -> AP request */
28 #define IPA_QMI_INDICATION_REGISTER_REQ_SZ 20 /* -> server handle */
29 #define IPA_QMI_INDICATION_REGISTER_RSP_SZ 7 /* <- server handle */
30 #define IPA_QMI_INIT_DRIVER_REQ_SZ 162 /* client handle -> */
31 #define IPA_QMI_INIT_DRIVER_RSP_SZ 25 /* client handle <- */
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| /linux/tools/testing/selftests/mm/ |
| H A D | hugepage-shm.c | 1 // SPDX-License-Identifier: GPL-2.0
3 * hugepage-shm:
5 * Example of using huge page memory in a user application using Sys V shared
6 * memory system calls. In this example the app is requesting 256MB of
7 * memory that is backed by huge pages. The application uses the flag
11 * Note: The default shared memory limit is quite low on many kernels,
16 * This will increase the maximum size per shared memory segment to 256MB.
18 * total amount of shared memory in pages. To set it to 16GB on a system
49 if (shmaddr == (char *)-1) { in main()
50 perror("Shared memory attach failure"); in main()
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| /linux/drivers/tee/optee/ |
| H A D | optee_rpc_cmd.h | 1 /* SPDX-License-Identifier: BSD-2-Clause */
3 * Copyright (c) 2016-2021, Linaro Limited
14 * RPC communication with tee-supplicant is reversed compared to normal
23 * 1970-01-01 00:00:00 +0000 (UTC).
39 * which instead is sent via a non-secure interrupt.
62 * Allocate a piece of shared memory
64 * [in] value[0].a Type of memory one of
71 /* Memory that can be shared with a non-secure user space application */
73 /* Memory only shared with non-secure kernel */
77 * Free shared memory previously allocated with OPTEE_RPC_CMD_SHM_ALLOC
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| /linux/tools/testing/selftests/arm64/mte/ |
| H A D | check_child_memory.c | 1 // SPDX-License-Identifier: GPL-2.0
25 1, 537, 989, 1269, MT_GRANULE_SIZE - 1, MT_GRANULE_SIZE,
26 /* page size - 1*/ 0, /* page_size */ 0, /* page size + 1 */ 0
38 if (child == -1) { in check_child_tag_inheritance()
58 mte_initialize_current_context(mode, (uintptr_t)ptr, -UNDERFLOW); in check_child_tag_inheritance()
59 memset(ptr - UNDERFLOW, '2', UNDERFLOW); in check_child_tag_inheritance()
115 if (fd == -1) in check_child_file_mapping()
126 /* Only mte enabled memory will allow tag insertion */ in check_child_file_mapping()
129 ksft_print_msg("FAIL: Insert tags on file based memory\n"); in check_child_file_mapping()
154 sizes[item - 3] = page_size - 1; in main()
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| /linux/include/linux/soc/apple/ |
| H A D | rtkit.h | 1 /* SPDX-License-Identifier: GPL-2.0-only OR MIT */
6 * Apple's SoCs come with various co-processors running their RTKit operating
18 * Struct to represent implementation-specific RTKit operations.
20 * @buffer: Shared memory buffer allocated inside normal RAM.
21 * @iomem: Shared memory buffer controlled by the co-processors.
22 * @size: Size of the shared memory buffer.
23 * @iova: Device VA of shared memory buffer.
24 * @is_mapped: Shared memory buffer is managed by the co-processor.
38 * Struct to represent implementation-specific RTKit operations.
40 * @crashed: Called when the co-processor has crashed. Runs in process
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| /linux/arch/arm/boot/dts/st/ |
| H A D | stm32mp157a-microgea-stm32mp1.dtsi | 1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
3 * Copyright (c) STMicroelectronics 2019 - All Rights Reserved
9 compatible = "engicam,microgea-stm32mp1", "st,stm32mp157";
11 memory@c0000000 {
12 device_type = "memory";
16 reserved-memory {
17 #address-cells = <1>;
18 #size-cells = <1>;
22 compatible = "shared-dma-pool";
24 no-map;
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| H A D | stm32mp157a-icore-stm32mp1.dtsi | 1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
3 * Copyright (c) STMicroelectronics 2019 - All Rights Reserved
9 compatible = "engicam,icore-stm32mp1", "st,stm32mp157";
11 memory@c0000000 {
12 device_type = "memory";
16 reserved-memory {
17 #address-cells = <1>;
18 #size-cells = <1>;
22 compatible = "shared-dma-pool";
24 no-map;
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| /linux/arch/x86/coco/tdx/ |
| H A D | tdx.c | 1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2021-2022 Intel Corporation */
16 #include <asm/insn-eval.h>
80 /* Read TD-scoped metadata */
94 /* Write TD-scoped metadata */
107 * tdx_mcall_get_report0() - Wrapper to get TDREPORT0 (a.k.a. TDREPORT
109 * @reportdata: Address of the input buffer which contains user-defined
118 * Return 0 on success, -ENXIO for invalid operands, -EBUSY for busy operation,
119 * or -EIO on other TDCALL failures.
133 return -ENXIO; in tdx_mcall_get_report0()
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| /linux/arch/arm/boot/dts/ti/omap/ |
| H A D | am572x-idk-common.dtsi | 1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
6 #include <dt-bindings/gpio/gpio.h>
7 #include <dt-bindings/interrupt-controller/irq.h>
8 #include "am57xx-idk-common.dtsi"
9 #include "dra74-ipu-dsp-common.dtsi"
12 memory@0 {
13 device_type = "memory";
17 reserved-memory {
18 #address-cells = <2>;
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| /linux/tools/memory-model/Documentation/ |
| H A D | README | 4 Linux-kernel memory model (LKMM) audience might be anywhere from novice
12 If LKMM-specific terms lost you, glossary.txt might help you.
14 o You are new to Linux-kernel concurrency: simple.txt
16 o You have some background in Linux-kernel concurrency, and would
17 like an overview of the types of low-level concurrency primitives
22 o You are familiar with the Linux-kernel concurrency primitives
24 tests: litmus-tests.txt
26 o You need to locklessly access shared variables that are otherwise
30 recipes.txt, but is self-contained.
32 o You are familiar with Linux-kernel concurrency, and would
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| /linux/tools/testing/selftests/powerpc/ptrace/ |
| H A D | ptrace-tm-spr.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
10 /* Tracee and tracer shared data */
11 struct shared { struct
18 struct shared *cptr, *pptr; argument
26 FAIL_IF(regs->tm_tfhar != tfhar); in validate_tm_spr()
27 FAIL_IF((regs->tm_texasr == TM_KVM_SCHED) && (regs->tm_tfiar != 0)); in validate_tm_spr()
37 cptr = (struct shared *)shmat(shm_id, NULL, 0); in tm_spr()
46 "bl 4f;" /* $ = TFHAR - 12 */ in tm_spr()
75 : "memory", "r0", "r8", "r31" in tm_spr()
82 if (!cptr->flag) in tm_spr()
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| /linux/tools/perf/Documentation/ |
| H A D | perf-c2c.txt | 1 perf-c2c(1)
5 ----
6 perf-c2c - Shared Data C2C/HITM Analyzer.
9 --------
12 'perf c2c record' [<options>] \-- [<record command options>] <command>
16 -----------
19 The perf c2c tool provides means for Shared Data C2C/HITM analysis. It allows
27 required. See linkperf:perf-arm-spe[1] for a setup guide. Due to the
28 statistical nature of Arm SPE sampling, not every memory operation will be
32 - memory address of the access
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| /linux/drivers/net/ethernet/microsoft/mana/ |
| H A D | shm_channel.c | 1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
17 #define SHMEM_VF_RESET_STATE ((u32)-1)
32 /* Shared memory channel protocol header
38 * direction: 0 for request, VF->PF; 1 for response, PF->VF.
67 #define SMC_LAST_DWORD (SMC_APERTURE_DWORDS - 1)
93 return -ETIMEDOUT; in mana_smc_poll_register()
99 void __iomem *base = sc->base; in mana_smc_read_response()
116 dev_err(sc->dev, "Wrong SMC response 0x%x, type=%d, ver=%d\n", in mana_smc_read_response()
118 return -EPROTO; in mana_smc_read_response()
123 dev_err(sc->dev, "SMC operation failed: 0x%x\n", hdr.status); in mana_smc_read_response()
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| /linux/Documentation/driver-api/ |
| H A D | ntb.rst | 5 NTB (Non-Transparent Bridge) is a type of PCI-Express bridge chip that connects
6 the separate memory systems of two or more computers to the same PCI-Express
8 registers and memory translation windows, as well as non common features like
9 scratchpad and message registers. Scratchpad registers are read-and-writable
15 Memory windows allow translated read and write access to the peer memory.
36 ----------------------------------------
38 Primary purpose of NTB is to share some piece of memory between at least two
40 mainly used to perform the proper memory window initialization. Typically
41 there are two types of memory window interfaces supported by the NTB API:
48 Memory: Local NTB Port: Peer NTB Port: Peer MMIO:
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| /linux/Documentation/devicetree/bindings/mailbox/ |
| H A D | mailbox.txt | 9 - #mbox-cells: Must be at least 1. Number of cells in a mailbox
15 #mbox-cells = <1>;
22 - mboxes: List of phandle and mailbox channel specifiers.
25 - mbox-names: List of identifier strings for each mailbox channel.
26 - shmem : List of phandle pointing to the shared memory(SHM) area between the
27 users of these mailboxes for IPC, one for each mailbox. This shared
28 memory can be part of any memory reserved for the purpose of this
35 mbox-names = "pwr-ctrl", "rpc";
39 Example with shared memory(shmem):
42 compatible = "mmio-sram";
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| /linux/arch/powerpc/platforms/pseries/ |
| H A D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0
4 bool "IBM pSeries & new (POWER5-based) iSeries"
41 bool "Support for shared-processor logical partitions"
48 on logically-partitioned pSeries systems which use shared
81 to return information about hardware error and non-error events
111 bool "Support for shared-memory logical partitions"
115 Select this option to enable shared memory partition support.
117 memory than physically available and will allow firmware to
118 balance memory across many LPARs.
121 tristate "Collaborative memory management"
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