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/Linux-v5.15/drivers/fpga/
Ddfl-afu-dma-region.c1 // SPDX-License-Identifier: GPL-2.0
3 * Driver for FPGA Accelerated Function Unit (AFU) DMA Region Management
5 * Copyright (C) 2017-2018 Intel Corporation, Inc.
12 #include <linux/dma-mapping.h>
17 #include "dfl-afu.h"
23 afu->dma_regions = RB_ROOT; in afu_dma_region_init()
27 * afu_dma_pin_pages - pin pages of given dma memory region
29 * @region: dma memory region to be pinned
35 struct dfl_afu_dma_region *region) in afu_dma_pin_pages() argument
37 int npages = region->length >> PAGE_SHIFT; in afu_dma_pin_pages()
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/Linux-v5.15/Documentation/devicetree/bindings/reserved-memory/
Dreserved-memory.txt1 *** Reserved memory regions ***
3 Reserved memory is specified as a node under the /reserved-memory node.
4 The operating system shall exclude reserved memory from normal usage
6 normal use) memory regions. Such memory regions are usually designed for
9 Parameters for each memory region can be encoded into the device tree
12 /reserved-memory node
13 ---------------------
14 #address-cells, #size-cells (required) - standard definition
15 - Should use the same values as the root node
16 ranges (required) - standard definition
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Dqcom,rmtfs-mem.txt1 Qualcomm Remote File System Memory binding
3 This binding describes the Qualcomm remote filesystem memory, which serves the
4 purpose of describing the shared memory region used for remote processors to
7 - compatible:
11 "qcom,rmtfs-mem"
13 - reg:
15 Value type: <prop-encoded-array>
16 Definition: must specify base address and size of the memory region,
17 as described in reserved-memory.txt
19 - size:
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/Linux-v5.15/arch/um/kernel/
Dphysmem.c1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
12 #include <as-layout.h>
18 static int physmem_fd = -1;
50 if (err == -ENOMEM) in map_memory()
53 "memory size>/4096\n"); in map_memory()
60 * setup_physmem() - Setup physical memory for UML
61 * @start: Start address of the physical kernel memory,
63 * @reserve_end: end address of the physical kernel memory.
64 * @len: Length of total physical memory that should be mapped/made
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/Linux-v5.15/mm/
Dmemblock.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Procedures for maintaining information about logical memory blocks.
35 * Memblock is a method of managing memory regions during the early
36 * boot period when the usual kernel memory allocators are not up and
39 * Memblock views the system memory as collections of contiguous
42 * * ``memory`` - describes the physical memory available to the
43 * kernel; this may differ from the actual physical memory installed
44 * in the system, for instance when the memory is restricted with
46 * * ``reserved`` - describes the regions that were allocated
47 * * ``physmem`` - describes the actual physical memory available during
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Dnommu.c1 // SPDX-License-Identifier: GPL-2.0-only
6 * have any form of memory management unit (thus no virtual memory).
8 * See Documentation/admin-guide/mm/nommu-mmap.rst
10 * Copyright (c) 2004-2008 David Howells <dhowells@redhat.com>
11 * Copyright (c) 2000-2003 David McCullough <davidm@snapgear.com>
12 * Copyright (c) 2000-2001 D Jeff Dionne <jeff@uClinux.org>
14 * Copyright (c) 2007-2010 Paul Mundt <lethal@linux-sh.org>
31 #include <linux/backing-dev.h>
68 * Return the total memory allocated for this pointer, not
95 * region. This test is intentionally done in reverse order, in kobjsize()
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/Linux-v5.15/include/uapi/linux/
Dnitro_enclaves.h1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
16 * NE_CREATE_VM - The command is used to create a slot that is associated with
20 * setting any resources, such as memory and vCPUs, for an
21 * enclave. Memory and vCPUs are set for the slot mapped to an enclave.
25 * Its format is the detailed in the cpu-lists section:
26 * https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
34 * * Enclave file descriptor - Enclave file descriptor used with
35 * ioctl calls to set vCPUs and memory
37 * * -1 - There was a failure in the ioctl logic.
39 * * EFAULT - copy_to_user() failure.
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/Linux-v5.15/drivers/net/ipa/
Dipa_mem.c1 // SPDX-License-Identifier: GPL-2.0
3 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
4 * Copyright (C) 2019-2021 Linaro Ltd.
10 #include <linux/dma-mapping.h>
23 /* "Canary" value placed between memory regions to detect overflow */
33 for (i = 0; i < ipa->mem_count; i++) { in ipa_mem_find()
34 const struct ipa_mem *mem = &ipa->mem[i]; in ipa_mem_find()
36 if (mem->id == mem_id) in ipa_mem_find()
43 /* Add an immediate command to a transaction that zeroes a memory region */
47 struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi); in ipa_mem_zero_region_add()
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Dipa_mem.h1 /* SPDX-License-Identifier: GPL-2.0 */
3 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
4 * Copyright (C) 2019-2021 Linaro Ltd.
13 * DOC: IPA Local Memory
15 * The IPA has a block of shared memory, divided into regions used for
19 * the "ipa-shared" memory range) and size found in the IPA_SHARED_MEM_SIZE
22 * Each region is optionally preceded by one or more 32-bit "canary" values.
23 * These are meant to detect out-of-range writes (if they become corrupted).
24 * A given region (such as a filter or routing table) has the same number
28 * The set of memory regions is defined in configuration data. They are
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/Linux-v5.15/drivers/acpi/
Dnvs.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * nvs.c - Routines for saving and restoring ACPI NVS memory region
5 * Copyright (C) 2008-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
40 struct nvs_region *region; in acpi_nvs_register() local
42 region = kmalloc(sizeof(*region), GFP_KERNEL); in acpi_nvs_register()
43 if (!region) in acpi_nvs_register()
44 return -ENOMEM; in acpi_nvs_register()
45 region->phys_start = start; in acpi_nvs_register()
46 region->size = size; in acpi_nvs_register()
47 list_add_tail(&region->node, &nvs_region_list); in acpi_nvs_register()
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/Linux-v5.15/tools/testing/selftests/kvm/lib/
Dkvm_util.c1 // SPDX-License-Identifier: GPL-2.0-only
28 size_t mask = size - 1; in align()
29 TEST_ASSERT(size != 0 && !(size & (size - 1)), in align()
38 * flags - The flags to pass when opening KVM_DEV_PATH.
66 * cap - Capability
96 * vm - Virtual Machine
97 * cap - Capability
109 ret = ioctl(vm->fd, KVM_ENABLE_CAP, cap); in vm_enable_cap()
119 * vm - Virtual Machine
120 * vcpu_id - VCPU
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/Linux-v5.15/drivers/gpu/drm/i915/
Dintel_region_ttm.c1 // SPDX-License-Identifier: MIT
19 * The code in this file deals with setting up memory managers for TTM
22 * i915 GEM regions to TTM memory types and resource managers.
26 * intel_region_ttm_device_init - Initialize a TTM device
33 struct drm_device *drm = &dev_priv->drm; in intel_region_ttm_device_init()
35 return ttm_device_init(&dev_priv->bdev, i915_ttm_driver(), in intel_region_ttm_device_init()
36 drm->dev, drm->anon_inode->i_mapping, in intel_region_ttm_device_init()
37 drm->vma_offset_manager, false, false); in intel_region_ttm_device_init()
41 * intel_region_ttm_device_fini - Finalize a TTM device
46 ttm_device_fini(&dev_priv->bdev); in intel_region_ttm_device_fini()
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/Linux-v5.15/arch/x86/boot/compressed/
Dkaslr.c1 // SPDX-License-Identifier: GPL-2.0
8 * handles walking the physical memory maps (and tracking memory regions
9 * to avoid) in order to select a physical memory location that can
45 /* Simplified build-specific string for starting entropy. */
57 hash = (hash << ((sizeof(hash) * 8) - 7)) | (hash >> 7); in rotate_xor()
86 * Store memory limit: MAXMEM on 64-bit and KERNEL_IMAGE_SIZE on 32-bit.
91 /* Number of immovable memory regions */
100 MEM_AVOID_MEMMAP_END = MEM_AVOID_MEMMAP_BEGIN + MAX_MEMMAP_REGIONS - 1,
109 if (one->start + one->size <= two->start) in mem_overlaps()
112 if (one->start >= two->start + two->size) in mem_overlaps()
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/Linux-v5.15/Documentation/PCI/endpoint/
Dpci-ntb-function.rst1 .. SPDX-License-Identifier: GPL-2.0
9 PCI Non-Transparent Bridges (NTB) allow two host systems to communicate
12 machine, expose memory ranges as BARs, and perform DMA. They also support
13 scratchpads, which are areas of memory within the NTB that are accessible
26 .. code-block:: text
28 +-------------+ +-------------+
32 +------^------+ +------^------+
35 +---------|-------------------------------------------------|---------+
36 | +------v------+ +------v------+ |
40 | | <-----------------------------------> | |
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/Linux-v5.15/include/linux/
Dmemblock.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
7 * Logical memory blocks.
29 * enum memblock_flags - definition of memory region attributes
31 * @MEMBLOCK_HOTPLUG: hotpluggable region
32 * @MEMBLOCK_MIRROR: mirrored region
34 * reserved in the memory map; refer to memblock_mark_nomap() description
39 MEMBLOCK_HOTPLUG = 0x1, /* hotpluggable region */
40 MEMBLOCK_MIRROR = 0x2, /* mirrored region */
45 * struct memblock_region - represents a memory region
46 * @base: base address of the region
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Darm_ffa.h1 /* SPDX-License-Identifier: GPL-2.0-only */
41 fdev->dev.driver_data = data; in ffa_dev_set_drvdata()
66 return -EINVAL; in ffa_driver_register()
87 * module_ffa_driver() - Helper macro for registering a psa_ffa driver
120 /* The base IPA of the constituent memory region, aligned to 4 kiB */
122 /* The number of 4 kiB pages in the constituent memory region. */
129 * The total number of 4 kiB pages included in this memory region. This
134 /* The number of constituents included in this memory region range */
137 /** An array of `addr_range_cnt` memory region constituents. */
142 /* The ID of the VM to which the memory is being given or shared. */
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Dpruss_driver.h1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * PRU-ICSS sub-system specific definitions
5 * Copyright (C) 2014-2020 Texas Instruments Incorporated - http://www.ti.com/
6 * Suman Anna <s-anna@ti.com>
15 * enum pruss_mem - PRUSS memory range identifiers
25 * struct pruss_mem_region - PRUSS memory region structure
26 * @va: kernel virtual address of the PRUSS memory region
27 * @pa: physical (bus) address of the PRUSS memory region
28 * @size: size of the PRUSS memory region
37 * struct pruss - PRUSS parent structure
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/Linux-v5.15/Documentation/devicetree/bindings/pmem/
Dpmem-region.txt1 Device-tree bindings for persistent memory regions
2 -----------------------------------------------------
4 Persistent memory refers to a class of memory devices that are:
6 a) Usable as main system memory (i.e. cacheable), and
9 Given b) it is best to think of persistent memory as a kind of memory mapped
11 persistent regions separately to the normal memory pool. To aid with that this
13 memory regions exist inside the physical address space.
15 Bindings for the region nodes:
16 -----------------------------
19 - compatible = "pmem-region"
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/Linux-v5.15/include/asm-generic/
Dsections.h1 /* SPDX-License-Identifier: GPL-2.0 */
12 * _text, _data: architecture specific, don't use them in arch-independent code
50 /* Start and end of .ctors section - used for constructor calls. */
53 /* Start and end of .opd section - used for function descriptors. */
87 * memory can be allocated from it, and such allocations would then have
98 * memory_contains - checks if an object is contained within a memory region
99 * @begin: virtual address of the beginning of the memory region
100 * @end: virtual address of the end of the memory region
101 * @virt: virtual address of the memory object
102 * @size: size of the memory object
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/Linux-v5.15/drivers/virt/acrn/
Dmm.c1 // SPDX-License-Identifier: GPL-2.0
3 * ACRN: Memory mapping management
18 static int modify_region(struct acrn_vm *vm, struct vm_memory_region_op *region) in modify_region() argument
25 return -ENOMEM; in modify_region()
27 regions->vmid = vm->vmid; in modify_region()
28 regions->regions_num = 1; in modify_region()
29 regions->regions_gpa = virt_to_phys(region); in modify_region()
34 "Failed to set memory region for VM[%u]!\n", vm->vmid); in modify_region()
41 * acrn_mm_region_add() - Set up the EPT mapping of a memory region.
45 * @size: Size of the region.
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/Linux-v5.15/tools/testing/selftests/kvm/
Dset_memory_region_test.c1 // SPDX-License-Identifier: GPL-2.0
24 * 2MB sized and aligned region so that the initial region corresponds to
63 * Loop until the guest is done. Re-enter the guest on all MMIO exits, in vcpu_worker()
72 if (run->exit_reason == KVM_EXIT_IO) { in vcpu_worker()
81 if (run->exit_reason != KVM_EXIT_MMIO) in vcpu_worker()
84 TEST_ASSERT(!run->mmio.is_write, "Unexpected exit mmio write"); in vcpu_worker()
85 TEST_ASSERT(run->mmio.len == 8, in vcpu_worker()
86 "Unexpected exit mmio size = %u", run->mmio.len); in vcpu_worker()
88 TEST_ASSERT(run->mmio.phys_addr == MEM_REGION_GPA, in vcpu_worker()
90 run->mmio.phys_addr); in vcpu_worker()
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/Linux-v5.15/Documentation/devicetree/bindings/remoteproc/
Dti,k3-dsp-rproc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/remoteproc/ti,k3-dsp-rproc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Suman Anna <s-anna@ti.com>
13 The TI K3 family of SoCs usually have one or more TI DSP Core sub-systems
14 that are used to offload some of the processor-intensive tasks or algorithms,
17 These processor sub-systems usually contain additional sub-modules like
18 L1 and/or L2 caches/SRAMs, an Interrupt Controller, an external memory
23 Each DSP Core sub-system is represented as a single DT node. Each node has a
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/Linux-v5.15/arch/x86/mm/
Dkaslr.c1 // SPDX-License-Identifier: GPL-2.0
3 * This file implements KASLR memory randomization for x86_64. It randomizes
4 * the virtual address space of kernel memory regions (physical memory
11 * The physical memory mapping code was adapted to support P4D/PUD level
13 * 30,000 possible virtual addresses in average for each memory region.
14 * An additional low memory page is used to ensure each CPU can start with
17 * The order of each memory region is not changed. The feature looks at
20 * physical memory mapping is the available physical memory.
44 * Memory regions randomized by KASLR (except modules that use a separate logic
57 /* Get size in bytes used by the memory region */
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/Linux-v5.15/Documentation/devicetree/bindings/media/
Ds5p-mfc.txt10 - compatible : value should be either one among the following
11 (a) "samsung,mfc-v5" for MFC v5 present in Exynos4 SoCs
12 (b) "samsung,mfc-v6" for MFC v6 present in Exynos5 SoCs
13 (c) "samsung,mfc-v7" for MFC v7 present in Exynos5420 SoC
14 (d) "samsung,mfc-v8" for MFC v8 present in Exynos5800 SoC
15 (e) "samsung,exynos5433-mfc" for MFC v8 present in Exynos5433 SoC
16 (f) "samsung,mfc-v10" for MFC v10 present in Exynos7880 SoC
18 - reg : Physical base address of the IP registers and length of memory
19 mapped region.
21 - interrupts : MFC interrupt number to the CPU.
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/Linux-v5.15/samples/nitro_enclaves/
Dne_ioctl_sample.c1 // SPDX-License-Identifier: GPL-2.0
11 * -----
19 * https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html#cpu-lists
26 * echo <cpu-list> > /sys/module/nitro_enclaves/parameters/ne_cpus
43 * Setup hugetlbfs huge pages. The memory needs to be from the same NUMA node as
46 * https://www.kernel.org/doc/html/latest/admin-guide/mm/hugetlbpage.html
52 * /sys/devices/system/node/node<X>/hugepages/hugepages-2048kB/nr_hugepages
53 * /sys/devices/system/node/node<X>/hugepages/hugepages-1048576kB/nr_hugepages
58 * /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
59 * /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages
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