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/linux-6.12.1/arch/arm/mm/
Ddma-mapping.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/arch/arm/mm/dma-mapping.c
5 * Copyright (C) 2000-2004 Russell King
17 #include <linux/dma-direct.h>
18 #include <linux/dma-map-ops.h>
28 #include <asm/page.h>
33 #include <asm/dma-iommu.h>
36 #include <asm/xen/xen-ops.h>
43 size_t size; member
53 size_t size; member
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/linux-6.12.1/kernel/dma/
Ddirect.c1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2018-2020 Christoph Hellwig.
10 #include <linux/dma-map-ops.h>
21 * override the variable below for dma-direct to work properly.
33 static inline struct page *dma_direct_to_page(struct device *dev, in dma_direct_to_page()
41 phys_addr_t phys = (phys_addr_t)(max_pfn - 1) << PAGE_SHIFT; in dma_direct_get_required_mask()
44 return (1ULL << (fls64(max_dma) - 1)) * 2 - 1; in dma_direct_get_required_mask()
50 dev->coherent_dma_mask, in dma_direct_optimal_gfp_mask()
51 dev->bus_dma_limit); in dma_direct_optimal_gfp_mask()
69 bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size) in dma_coherent_ok() argument
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Dops_helpers.c1 // SPDX-License-Identifier: GPL-2.0
6 #include <linux/dma-map-ops.h>
7 #include <linux/iommu-dma.h>
9 static struct page *dma_common_vaddr_to_page(void *cpu_addr) in dma_common_vaddr_to_page()
17 * Create scatter-list for the already allocated DMA buffer.
20 void *cpu_addr, dma_addr_t dma_addr, size_t size, in dma_common_get_sgtable() argument
23 struct page *page = dma_common_vaddr_to_page(cpu_addr); in dma_common_get_sgtable() local
28 sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); in dma_common_get_sgtable()
33 * Create userspace mapping for the DMA-coherent memory.
36 void *cpu_addr, dma_addr_t dma_addr, size_t size, in dma_common_mmap() argument
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Dpool.c1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/dma-map-ops.h>
9 #include <linux/dma-direct.h>
23 /* Size can be defined by the coherent_pool command line */
46 static void dma_atomic_pool_size_add(gfp_t gfp, size_t size) in dma_atomic_pool_size_add() argument
49 pool_size_dma += size; in dma_atomic_pool_size_add()
51 pool_size_dma32 += size; in dma_atomic_pool_size_add()
53 pool_size_kernel += size; in dma_atomic_pool_size_add()
58 unsigned long size; in cma_in_zone() local
66 size = cma_get_size(cma); in cma_in_zone()
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/linux-6.12.1/include/net/page_pool/
Dhelpers.h1 /* SPDX-License-Identifier: GPL-2.0
11 * The page_pool allocator is optimized for recycling page or page fragment used
15 * which allocate memory with or without page splitting depending on the
16 * requested memory size.
19 * always smaller than half a page, it can use one of the more specific API
22 * 1. page_pool_alloc_pages(): allocate memory without page splitting when
23 * driver knows that the memory it need is always bigger than half of the page
24 * allocated from page pool. There is no cache line dirtying for 'struct page'
25 * when a page is recycled back to the page pool.
27 * 2. page_pool_alloc_frag(): allocate memory with page splitting when driver
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/linux-6.12.1/sound/pci/emu10k1/
Dmemory.c1 // SPDX-License-Identifier: GPL-2.0-or-later
6 * EMU10K1 memory page allocation (PTB area)
18 /* page arguments of these two macros are Emu page (4096 bytes), not like
21 #define __set_ptb_entry(emu,page,addr) \ argument
22 (((__le32 *)(emu)->ptb_pages.area)[page] = \
23 cpu_to_le32(((addr) << (emu->address_mode)) | (page)))
24 #define __get_ptb_entry(emu, page) \ argument
25 (le32_to_cpu(((__le32 *)(emu)->ptb_pages.area)[page]))
30 /* get aligned page from offset address */
32 /* get offset address from aligned page */
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/linux-6.12.1/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/
Dvmm.c32 kvfree(pgt->pde); in nvkm_vmm_pt_del()
41 const struct nvkm_vmm_page *page) in nvkm_vmm_pt_new() argument
43 const u32 pten = 1 << desc->bits; in nvkm_vmm_pt_new()
47 if (desc->type > PGT) { in nvkm_vmm_pt_new()
48 if (desc->type == SPT) { in nvkm_vmm_pt_new()
49 const struct nvkm_vmm_desc *pair = page[-1].desc; in nvkm_vmm_pt_new()
50 lpte = pten >> (desc->bits - pair->bits); in nvkm_vmm_pt_new()
58 pgt->page = page ? page->shift : 0; in nvkm_vmm_pt_new()
59 pgt->sparse = sparse; in nvkm_vmm_pt_new()
61 if (desc->type == PGD) { in nvkm_vmm_pt_new()
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/linux-6.12.1/arch/arm64/include/asm/
Dkvm_pgtable.h1 // SPDX-License-Identifier: GPL-2.0-only
14 #define KVM_PGTABLE_FIRST_LEVEL -1
18 * The largest supported block sizes for KVM (no 52-bit PA support):
19 * - 4K (level 1): 1GB
20 * - 16K (level 2): 32MB
21 * - 64K (level 2): 512MB
60 #define KVM_PHYS_INVALID (-1ULL)
99 * Used to indicate a pte for which a 'break-before-make' sequence is in
176 static inline bool kvm_is_block_size_supported(u64 size) in kvm_is_block_size_supported() argument
178 bool is_power_of_two = IS_ALIGNED(size, size); in kvm_is_block_size_supported()
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/linux-6.12.1/Documentation/admin-guide/mm/
Dhugetlbpage.rst9 the Linux kernel. This support is built on top of multiple page size support
11 support 4K and 2M (1G if architecturally supported) page sizes, ia64
12 architecture supports multiple page sizes 4K, 8K, 64K, 256K, 1M, 4M, 16M,
13 256M and ppc64 supports 4K and 16M. A TLB is a cache of virtual-to-physical
19 Users can use the huge page support in Linux kernel by either using the mmap
28 persistent hugetlb pages in the kernel's huge page pool. It also displays
29 default huge page size and information about the number of free, reserved
30 and surplus huge pages in the pool of huge pages of default size.
31 The huge page size is needed for generating the proper alignment and
32 size of the arguments to system calls that map huge page regions.
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Dtranshuge.rst12 that supports the automatic promotion and demotion of page sizes and
19 in the examples below we presume that the basic page size is 4K and
20 the huge page size is 2M, although the actual numbers may vary
26 requiring larger clear-page copy-page in page faults which is a
28 single page fault for each 2M virtual region touched by userland (so
43 larger size only if both KVM and the Linux guest are using
48 Modern kernels support "multi-size THP" (mTHP), which introduces the
49 ability to allocate memory in blocks that are bigger than a base page
50 but smaller than traditional PMD-size (as described above), in
51 increments of a power-of-2 number of pages. mTHP can back anonymous
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/linux-6.12.1/mm/
Dzsmalloc.c10 * Released under the terms of 3-clause BSD License
16 * struct page(s) to form a zspage.
18 * Usage of struct page fields:
19 * page->private: points to zspage
20 * page->index: links together all component pages of a zspage
21 * For the huge page, this is always 0, so we use this field
23 * page->page_type: PGTY_zsmalloc, lower 24 bits locate the first object
26 * Usage of struct page flags:
27 * PG_private: identifies the first component page
28 * PG_owner_priv_1: identifies the huge component page
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Ddmapool.c1 // SPDX-License-Identifier: GPL-2.0-only
9 * This allocator returns small blocks of a given size which are DMA-able by
10 * the given device. It uses the dma_alloc_coherent page allocator to get
11 * new pages, then splits them up into blocks of the required size.
15 * represented by the 'struct dma_pool' which keeps a doubly-linked list of
16 * allocated pages. Each page in the page_list is split into blocks of at
17 * least 'size' bytes. Free blocks are tracked in an unsorted singly-linked
19 * keep a count of how many are currently allocated from each page.
23 #include <linux/dma-mapping.h>
56 unsigned int size; member
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/linux-6.12.1/drivers/vdpa/vdpa_user/
Diova_domain.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * MMU-based software IOTLB.
5 * Copyright (C) 2020-2021 Bytedance Inc. and/or its affiliates. All rights reserved.
30 return -ENOMEM; in vduse_iotlb_add_range()
32 map_file->file = get_file(file); in vduse_iotlb_add_range()
33 map_file->offset = offset; in vduse_iotlb_add_range()
35 ret = vhost_iotlb_add_range_ctx(domain->iotlb, start, last, in vduse_iotlb_add_range()
38 fput(map_file->file); in vduse_iotlb_add_range()
51 while ((map = vhost_iotlb_itree_first(domain->iotlb, start, last))) { in vduse_iotlb_del_range()
52 map_file = (struct vdpa_map_file *)map->opaque; in vduse_iotlb_del_range()
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/linux-6.12.1/arch/powerpc/include/asm/nohash/32/
Dmmu-8xx.h1 /* SPDX-License-Identifier: GPL-2.0 */
10 * During software tablewalk, the registers used perform mask/shift-add
34 * Then we use the APG to say whether accesses are according to Page rules or
39 * 0 => Kernel => 11 (all accesses performed according as user iaw page definition)
40 * 1 => Kernel+Accessed => 01 (all accesses performed according to page definition)
41 * 2 => User => 11 (all accesses performed according as user iaw page definition)
42 * 3 => User+Accessed => 10 (all accesses performed according to swaped page definition) for KUEP
43 * 4-15 => Not Used
47 /* The effective page number register. When read, contains the information
52 #define MI_EPNMASK 0xfffff000 /* Effective page number for entry */
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/linux-6.12.1/drivers/misc/
Dvmw_balloon.c1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2000-2018, VMware, Inc. All Rights Reserved.
46 …"Enable non-cooperative out-of-memory protection. Disabled by default as it may degrade performanc…
54 /* Magic number for the balloon mount-point */
80 #define VMW_BALLOON_2M_ORDER (PMD_SHIFT - PAGE_SHIFT)
83 * 64-bit targets are only supported in 64-bit
118 * enum vmballoon_cmd_type - backdoor commands.
140 * @VMW_BALLOON_CMD_GET_TARGET: Gets the balloon target size.
141 * @VMW_BALLOON_CMD_LOCK: Informs the hypervisor about a ballooned page.
142 * @VMW_BALLOON_CMD_UNLOCK: Informs the hypervisor about a page that is about
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/linux-6.12.1/Documentation/mm/
Dvmemmap_dedup.rst2 .. SPDX-License-Identifier: GPL-2.0
13 The ``struct page`` structures are used to describe a physical page frame. By
14 default, there is a one-to-one mapping from a page frame to its corresponding
15 ``struct page``.
17 HugeTLB pages consist of multiple base page size pages and is supported by many
18 architectures. See Documentation/admin-guide/mm/hugetlbpage.rst for more
19 details. On the x86-64 architecture, HugeTLB pages of size 2MB and 1GB are
20 currently supported. Since the base page size on x86 is 4KB, a 2MB HugeTLB page
21 consists of 512 base pages and a 1GB HugeTLB page consists of 262144 base pages.
22 For each base page, there is a corresponding ``struct page``.
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/linux-6.12.1/include/linux/
Ddma-map-ops.h1 /* SPDX-License-Identifier: GPL-2.0 */
9 #include <linux/dma-mapping.h>
17 void *(*alloc)(struct device *dev, size_t size,
20 void (*free)(struct device *dev, size_t size, void *vaddr,
22 struct page *(*alloc_pages_op)(struct device *dev, size_t size,
25 void (*free_pages)(struct device *dev, size_t size, struct page *vaddr,
31 void *cpu_addr, dma_addr_t dma_addr, size_t size,
34 dma_addr_t (*map_page)(struct device *dev, struct page *page,
35 unsigned long offset, size_t size,
38 size_t size, enum dma_data_direction dir,
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Dkasan.h1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <linux/kasan-enabled.h>
7 #include <linux/kasan-tags.h>
13 struct page;
66 int kasan_add_zero_shadow(void *start, unsigned long size);
67 void kasan_remove_zero_shadow(void *start, unsigned long size);
77 static inline int kasan_add_zero_shadow(void *start, unsigned long size) in kasan_add_zero_shadow() argument
82 unsigned long size) in kasan_remove_zero_shadow() argument
102 void __kasan_unpoison_range(const void *addr, size_t size);
103 static __always_inline void kasan_unpoison_range(const void *addr, size_t size) in kasan_unpoison_range() argument
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/linux-6.12.1/arch/powerpc/mm/
Ddma-noncoherent.c1 // SPDX-License-Identifier: GPL-2.0-only
13 #include <linux/dma-direct.h>
14 #include <linux/dma-map-ops.h>
22 static void __dma_sync(void *vaddr, size_t size, int direction) in __dma_sync() argument
25 unsigned long end = start + size; in __dma_sync()
32 * invalidate only when cache-line aligned otherwise there is in __dma_sync()
35 if ((start | end) & (L1_CACHE_BYTES - 1)) in __dma_sync()
52 * In this case, each page of a buffer must be kmapped/kunmapped
57 * beyond the first page.
59 static inline void __dma_sync_page_highmem(struct page *page, in __dma_sync_page_highmem() argument
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/linux-6.12.1/fs/hfsplus/
Dbitmap.c1 // SPDX-License-Identifier: GPL-2.0
19 int hfsplus_block_allocate(struct super_block *sb, u32 size, in hfsplus_block_allocate() argument
23 struct page *page; in hfsplus_block_allocate() local
32 return size; in hfsplus_block_allocate()
34 hfs_dbg(BITMAP, "block_allocate: %u,%u,%u\n", size, offset, len); in hfsplus_block_allocate()
35 mutex_lock(&sbi->alloc_mutex); in hfsplus_block_allocate()
36 mapping = sbi->alloc_file->i_mapping; in hfsplus_block_allocate()
37 page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS, NULL); in hfsplus_block_allocate()
38 if (IS_ERR(page)) { in hfsplus_block_allocate()
39 start = size; in hfsplus_block_allocate()
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/linux-6.12.1/lib/
Diov_iter.c1 // SPDX-License-Identifier: GPL-2.0-only
4 #include <linux/fault-inject-usercopy.h>
78 * fault_in_iov_iter_readable - fault in iov iterator for reading
80 * @size: maximum length
83 * @size. For each iovec, fault in each page that constitutes the iovec.
88 * Always returns 0 for non-userspace iterators.
90 size_t fault_in_iov_iter_readable(const struct iov_iter *i, size_t size) in fault_in_iov_iter_readable() argument
93 size_t n = min(size, iov_iter_count(i)); in fault_in_iov_iter_readable()
94 n -= fault_in_readable(i->ubuf + i->iov_offset, n); in fault_in_iov_iter_readable()
95 return size - n; in fault_in_iov_iter_readable()
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/linux-6.12.1/sound/pci/trident/
Dtrident_memory.c1 // SPDX-License-Identifier: GPL-2.0-or-later
7 * Trident 4DWave-NX memory page allocation (TLB area)
19 /* page arguments of these two macros are Trident page (4096 bytes), not like
22 #define __set_tlb_bus(trident,page,addr) \ argument
23 (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1))
24 #define __tlb_to_addr(trident,page) \ argument
25 (dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))
28 /* page size == SNDRV_TRIDENT_PAGE_SIZE */
29 #define ALIGN_PAGE_SIZE PAGE_SIZE /* minimum page size for allocation */
31 /* fill TLB entrie(s) corresponding to page with ptr */
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/linux-6.12.1/kernel/module/
Ddecompress.c1 // SPDX-License-Identifier: GPL-2.0-or-later
19 struct page **new_pages; in module_extend_max_pages()
21 new_pages = kvmalloc_array(info->max_pages + extent, in module_extend_max_pages()
22 sizeof(info->pages), GFP_KERNEL); in module_extend_max_pages()
24 return -ENOMEM; in module_extend_max_pages()
26 memcpy(new_pages, info->pages, info->max_pages * sizeof(info->pages)); in module_extend_max_pages()
27 kvfree(info->pages); in module_extend_max_pages()
28 info->pages = new_pages; in module_extend_max_pages()
29 info->max_pages += extent; in module_extend_max_pages()
34 static struct page *module_get_next_page(struct load_info *info) in module_get_next_page()
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/linux-6.12.1/mm/kmsan/
Dshadow.c1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2017-2022 Google LLC
22 #define shadow_page_for(page) ((page)->kmsan_shadow) argument
24 #define origin_page_for(page) ((page)->kmsan_origin) argument
26 static void *shadow_ptr_for(struct page *page) in shadow_ptr_for() argument
28 return page_address(shadow_page_for(page)); in shadow_ptr_for()
31 static void *origin_ptr_for(struct page *page) in origin_ptr_for() argument
33 return page_address(origin_page_for(page)); in origin_ptr_for()
36 static bool page_has_metadata(struct page *page) in page_has_metadata() argument
38 return shadow_page_for(page) && origin_page_for(page); in page_has_metadata()
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/linux-6.12.1/fs/ecryptfs/
Dread_write.c1 // SPDX-License-Identifier: GPL-2.0-or-later
20 * @size: Number of bytes from @data to write at @offset in the lower
28 loff_t offset, size_t size) in ecryptfs_write_lower() argument
33 lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file; in ecryptfs_write_lower()
35 return -EIO; in ecryptfs_write_lower()
36 rc = kernel_write(lower_file, data, size, &offset); in ecryptfs_write_lower()
44 * @page_for_lower: The page containing the data to be written to the
48 * @size: The amount of data from @page_for_lower to write to the
51 * Determines the byte offset in the file for the given page and
52 * offset within the page, maps the page, and makes the call to write
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