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/linux/Documentation/mm/
H A Dhighmem.rst15 at all times. This means the kernel needs to start using temporary mappings of
51 The kernel contains several ways of creating temporary mappings. The following
55 short term mappings. They can be invoked from any context (including
56 interrupts) but the mappings can only be used in the context which acquired
64 These mappings are thread-local and CPU-local, meaning that the mapping
89 mappings, the local mappings are only valid in the context of the caller
94 Most code can be designed to use thread local mappings. User should
99 Nesting kmap_local_page() and kmap_atomic() mappings is allowed to a certain
103 mappings.
110 effects of atomic mappings, i.e. disabling page faults or preemption, or both.
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H A Dhugetlbfs_reserv.rst87 of mappings. Location differences are:
89 - For private mappings, the reservation map hangs off the VMA structure.
92 - For shared mappings, the reservation map hangs off the inode. Specifically,
93 inode->i_mapping->private_data. Since shared mappings are always backed
121 One of the big differences between PRIVATE and SHARED mappings is the way
124 - For shared mappings, an entry in the reservation map indicates a reservation
127 - For private mappings, the lack of an entry in the reservation map indicates
133 For private mappings, hugetlb_reserve_pages() creates the reservation map and
138 are needed for the current mapping/segment. For private mappings, this is
139 always the value (to - from). However, for shared mappings it is possible that
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/linux/drivers/gpu/drm/tegra/
H A Dsubmit.c150 xa_lock(&context->mappings); in tegra_drm_mapping_get()
152 mapping = xa_load(&context->mappings, id); in tegra_drm_mapping_get()
156 xa_unlock(&context->mappings); in tegra_drm_mapping_get()
261 struct tegra_drm_used_mapping *mappings; in submit_process_bufs() local
273 mappings = kcalloc(args->num_bufs, sizeof(*mappings), GFP_KERNEL); in submit_process_bufs()
274 if (!mappings) { in submit_process_bufs()
303 mappings[i].mapping = mapping; in submit_process_bufs()
304 mappings[i].flags = buf->flags; in submit_process_bufs()
307 job_data->used_mappings = mappings; in submit_process_bufs()
316 tegra_drm_mapping_put(mappings[i].mapping); in submit_process_bufs()
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H A Duapi.c39 xa_for_each(&context->mappings, id, mapping) in tegra_drm_channel_context_close()
42 xa_destroy(&context->mappings); in tegra_drm_channel_context_close()
141 xa_init_flags(&context->mappings, XA_FLAGS_ALLOC1); in tegra_drm_ioctl_channel_open()
252 err = xa_alloc(&context->mappings, &args->mapping, mapping, XA_LIMIT(1, U32_MAX), in tegra_drm_ioctl_channel_map()
287 mapping = xa_erase(&context->mappings, args->mapping); in tegra_drm_ioctl_channel_unmap()
/linux/Documentation/arch/arm/
H A Dmemory.rst62 Machine specific static mappings are also
72 PKMAP_BASE PAGE_OFFSET-1 Permanent kernel mappings
78 placed here using dynamic mappings.
85 00001000 TASK_SIZE-1 User space mappings
86 Per-thread mappings are placed here via
96 Please note that mappings which collide with the above areas may result
103 must set up their own mappings using open() and mmap().
/linux/Documentation/driver-api/
H A Dio-mapping.rst44 used with mappings created by io_mapping_create_wc()
46 Temporary mappings are only valid in the context of the caller. The mapping
56 Nested mappings need to be undone in reverse order because the mapping
65 The mappings are released with::
83 The mappings are released with::
/linux/drivers/soc/aspeed/
H A DKconfig13 Control LPC firmware cycle mappings through ioctl()s. The driver
43 Control ASPEED P2A VGA MMIO to BMC mappings through ioctl()s. The
44 driver also provides an interface for userspace mappings to a
/linux/Documentation/admin-guide/mm/
H A Dnommu-mmap.rst29 These behave very much like private mappings, except that they're
133 In the no-MMU case, however, anonymous mappings are backed by physical
147 (#) A list of all the private copy and anonymous mappings on the system is
150 (#) A list of all the mappings in use by a process is visible through
176 mappings made by a process or if the mapping in which the address lies does not
191 Shared mappings may not be moved. Shareable mappings may not be moved either,
196 mappings, move parts of existing mappings or resize parts of mappings. It must
243 mappings may still be mapped directly off the device under some
250 Provision of shared mappings on memory backed files is similar to the provision
253 of pages and permit mappings to be made on that.
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/linux/drivers/regulator/
H A Drpi-panel-attiny-regulator.c58 static const struct gpio_signal_mappings mappings[NUM_GPIO] = { variable
224 last_val = attiny_get_port_state(state, mappings[off].reg); in attiny_gpio_set()
226 last_val |= mappings[off].mask; in attiny_gpio_set()
228 last_val &= ~mappings[off].mask; in attiny_gpio_set()
230 attiny_set_port_state(state, mappings[off].reg, last_val); in attiny_gpio_set()
/linux/Documentation/devicetree/bindings/
H A D.yamllint36 forbid-in-block-mappings: true
37 forbid-in-flow-mappings: true
/linux/Documentation/driver-api/usb/
H A Ddma.rst19 manage dma mappings for existing dma-ready buffers (see below).
27 don't manage dma mappings for URBs.
41 IOMMU to manage the DMA mappings. It can cost MUCH more to set up and
42 tear down the IOMMU mappings with each request than perform the I/O!
64 "streaming" DMA mappings.)
/linux/drivers/cxl/
H A Dpmem.c308 struct nd_mapping_desc mappings[CXL_DECODER_MAX_INTERLEAVE]; in cxl_pmem_region_probe() local
320 memset(&mappings, 0, sizeof(mappings)); in cxl_pmem_region_probe()
379 mappings[i] = (struct nd_mapping_desc) { in cxl_pmem_region_probe()
389 ndr_desc.mapping = mappings; in cxl_pmem_region_probe()
/linux/drivers/gpu/drm/panfrost/
H A Dpanfrost_gem_shrinker.c47 if (!mutex_trylock(&bo->mappings.lock)) in panfrost_gem_purge()
60 mutex_unlock(&bo->mappings.lock); in panfrost_gem_purge()
H A Dpanfrost_drv.c196 job->mappings = kvmalloc_array(job->bo_count, in panfrost_lookup_bos()
199 if (!job->mappings) in panfrost_lookup_bos()
213 job->mappings[i] = mapping; in panfrost_lookup_bos()
456 mutex_lock(&bo->mappings.lock); in panfrost_ioctl_madvise()
460 first = list_first_entry(&bo->mappings.list, in panfrost_ioctl_madvise()
472 if (!list_is_singular(&bo->mappings.list) || in panfrost_ioctl_madvise()
490 mutex_unlock(&bo->mappings.lock); in panfrost_ioctl_madvise()
/linux/Documentation/arch/arm64/
H A Dmemory.rst22 swapper_pg_dir contains only kernel (global) mappings while the user pgd
23 contains only user (non-global) mappings. The swapper_pg_dir address is
36 fffffbfff0000000 fffffbfffdffffff 224MB fixed mappings (top down)
53 fffffbfff0000000 fffffbfffdffffff 224MB fixed mappings (top down)
99 mappings are created, since the host kernel runs directly in EL2.
H A Dhugetlbpage.rst15 1) Block mappings at the pud/pmd level
20 mappings reduce the depth of page table walk needed to translate hugepage
/linux/tools/testing/nvdimm/test/
H A Dndtest.c414 struct nd_mapping_desc mappings[NDTEST_MAX_MAPPING]; in ndtest_create_region() local
422 memset(&mappings, 0, sizeof(mappings)); in ndtest_create_region()
430 ndr_desc->mapping = mappings; in ndtest_create_region()
451 mappings[i].start = region->mapping[i].start; in ndtest_create_region()
452 mappings[i].size = region->mapping[i].size; in ndtest_create_region()
453 mappings[i].position = region->mapping[i].position; in ndtest_create_region()
454 mappings[i].nvdimm = p->config->dimms[ndimm].nvdimm; in ndtest_create_region()
/linux/include/linux/
H A Dhost1x.h47 struct list_head mappings; member
53 INIT_LIST_HEAD(&cache->mappings); in host1x_bo_cache_init()
158 struct list_head mappings; member
165 INIT_LIST_HEAD(&bo->mappings); in host1x_bo_init()
/linux/Documentation/filesystems/iomap/
H A Ddesign.rst24 This layer tries to obtain mappings of each file ranges to storage
28 2. An upper layer that acts upon the space mappings provided by the
31 The iteration can involve mappings of file's logical offset ranges to
62 units (generally memory pages or blocks) and looks up space mappings on
64 largest space mappings that it can create for a given file operation and
69 Larger space mappings improve runtime performance by amortizing the cost
238 * **IOMAP_F_MERGED**: Multiple contiguous block mappings were
272 ``IOMAP_INLINE`` mappings.
282 that should be used to detect stale mappings.
286 Filesystems with completely static mappings need not set this value.
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/linux/Documentation/ABI/testing/
H A Dsysfs-firmware-efi-runtime-map10 the same physical to virtual address mappings as the first
11 kernel. The mappings are exported to sysfs so userspace tools
/linux/mm/
H A DKconfig.debug123 bool "Check for invalid mappings in user page tables"
187 bool "Warn on W+X mappings at boot"
192 Generate a warning if any W+X mappings are found at boot.
195 mappings after applying NX, as such mappings are a security risk.
199 <arch>/mm: Checked W+X mappings: passed, no W+X pages found.
203 <arch>/mm: Checked W+X mappings: failed, <N> W+X pages found.
206 still fine, as W+X mappings are not a security hole in
/linux/Documentation/gpu/rfc/
H A Di915_vm_bind.rst9 specified address space (VM). These mappings (also referred to as persistent
10 mappings) will be persistent across multiple GPU submissions (execbuf calls)
12 mappings during each submission (as required by older execbuf mode).
27 * Multiple Virtual Address (VA) mappings can map to the same physical pages
30 * Support capture of persistent mappings in the dump upon GPU error.
90 path (where required mappings are already bound) submission latency is O(1)
201 execbuf. VM_BIND allows bind/unbind of mappings required for the directly
231 mapped objects. Page table pages are similar to persistent mappings of a
/linux/Documentation/arch/riscv/
H A Dvm-layout.rst44 … | | | | starting offset of kernel mappings.
81 | | | | starting offset of kernel mappings.
117 | | | | starting offset of kernel mappings.
/linux/Documentation/core-api/
H A Ddma-api-howto.rst35 mappings between physical and bus addresses.
172 The setup for streaming mappings is performed via a call to
234 coherent allocations, but supports full 64-bits for streaming mappings
257 kernel will use this information later when you make DMA mappings.
296 Types of DMA mappings
299 There are two types of DMA mappings:
301 - Consistent DMA mappings which are usually mapped at driver
314 Good examples of what to use consistent mappings for are:
323 versa. Consistent mappings guarantee this.
345 - Streaming DMA mappings which are usually mapped for one DMA
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/linux/drivers/nvdimm/
H A Dregion_devs.c301 static DEVICE_ATTR_RO(mappings);
559 u32 mappings, remainder; in align_store() local
573 mappings = max_t(u32, 1, nd_region->ndr_mappings); in align_store()
574 dpa = div_u64_rem(val, mappings, &remainder); in align_store()
984 int mappings; in default_align() local
990 mappings = max_t(u16, 1, nd_region->ndr_mappings); in default_align()
991 div_u64_rem(align, mappings, &remainder); in default_align()
993 align *= mappings; in default_align()

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