| /kernel/linux/linux-6.6/drivers/gpu/drm/ |
| D | drm_fb_dma_helper.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
6 * Author: Lars-Peter Clausen <lars@metafoo.de>
19 #include <linux/dma-mapping.h>
25 * Provides helper functions for creating a DMA-contiguous framebuffer.
27 * Depending on the platform, the buffers may be physically non-contiguous and
29 * physically-contiguous memory (using, for instance, CMA or a pool of memory
34 * callback function to create a DMA-contiguous framebuffer.
38 * drm_fb_dma_get_gem_obj() - Get DMA GEM object for framebuffer
60 * drm_fb_dma_get_gem_addr() - Get DMA (bus) address for framebuffer, for pixel
77 u32 block_w = drm_format_info_block_width(fb->format, plane); in drm_fb_dma_get_gem_addr()
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| /kernel/linux/linux-5.10/kernel/dma/ |
| D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0-only
88 # Should be selected if we can mmap non-coherent mappings to userspace.
111 bool "DMA Contiguous Memory Allocator"
114 This enables the Contiguous Memory Allocator which allows drivers
115 to allocate big physically-contiguous blocks of memory for use with
116 hardware components that do not support I/O map nor scatter-gather.
121 For more information see <kernel/dma/contiguous.c>.
127 bool "Enable separate DMA Contiguous Memory Area for each NUMA Node"
136 comment "Default contiguous memory area size:"
144 Defines the size (in MiB) of the default memory area for Contiguous
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| /kernel/linux/linux-6.6/kernel/dma/ |
| D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0-only
100 pools as needed. To reduce run-time kernel memory requirements, you
119 <Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt>
124 # Should be selected if we can mmap non-coherent mappings to userspace.
146 bool "DMA Contiguous Memory Allocator"
149 This enables the Contiguous Memory Allocator which allows drivers
150 to allocate big physically-contiguous blocks of memory for use with
151 hardware components that do not support I/O map nor scatter-gather.
156 For more information see <kernel/dma/contiguous.c>.
162 bool "Enable separate DMA Contiguous Memory Area for NUMA Node"
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| /kernel/linux/linux-6.6/Documentation/driver-api/dmaengine/ |
| D | provider.rst | 20 DMA-eligible devices to the controller itself. Whenever the device
44 transfer into smaller sub-transfers.
47 that involve a single contiguous block of data. However, some of the
49 non-contiguous buffers to a contiguous buffer, which is called
50 scatter-gather.
53 scatter-gather. So we're left with two cases here: either we have a
56 that implements in hardware scatter-gather.
79 These were just the general memory-to-memory (also called mem2mem) or
80 memory-to-device (mem2dev) kind of transfers. Most devices often
98 documentation file in Documentation/crypto/async-tx-api.rst.
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| /kernel/linux/linux-5.10/Documentation/driver-api/dmaengine/ |
| D | provider.rst | 20 DMA-eligible devices to the controller itself. Whenever the device
44 transfer into smaller sub-transfers.
47 that involve a single contiguous block of data. However, some of the
49 non-contiguous buffers to a contiguous buffer, which is called
50 scatter-gather.
53 scatter-gather. So we're left with two cases here: either we have a
56 that implements in hardware scatter-gather.
79 These were just the general memory-to-memory (also called mem2mem) or
80 memory-to-device (mem2dev) kind of transfers. Most devices often
98 documentation file in Documentation/crypto/async-tx-api.rst.
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|
| /kernel/linux/linux-6.6/Documentation/mm/ |
| D | memory-model.rst | 1 .. SPDX-License-Identifier: GPL-2.0
9 spans a contiguous range up to the maximal address. It could be,
11 for the CPU. Then there could be several contiguous ranges at
23 Regardless of the selected memory model, there exists one-to-one
35 non-NUMA systems with contiguous, or mostly contiguous, physical
54 straightforward: `PFN - ARCH_PFN_OFFSET` is an index to the
65 as hot-plug and hot-remove of the physical memory, alternative memory
66 maps for non-volatile memory devices and deferred initialization of
85 NR\_MEM\_SECTIONS = 2 ^ {(MAX\_PHYSMEM\_BITS - SECTION\_SIZE\_BITS)}
87 The `mem_section` objects are arranged in a two-dimensional array
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| /kernel/linux/linux-6.6/arch/nios2/ |
| D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0
49 int "Order of maximal physically contiguous allocations"
53 contiguous allocations. The limit is called MAX_ORDER and it
55 allocated as a single contiguous block. This option allows
57 large blocks of physically contiguous memory is required.
80 2 or 4. Any non-aligned load/store instructions will be trapped and
97 some command-line options at build time by entering them here. In
118 bool "Passed kernel command line from u-boot"
120 Use bootargs env variable from u-boot for kernel command line.
|
| /kernel/linux/linux-5.10/drivers/gpu/drm/exynos/ |
| D | exynos_drm_gem.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
9 #include <linux/dma-buf.h>
22 struct drm_device *dev = exynos_gem->base.dev; in exynos_drm_alloc_buf()
25 if (exynos_gem->dma_addr) { in exynos_drm_alloc_buf()
31 * if EXYNOS_BO_CONTIG, fully physically contiguous memory in exynos_drm_alloc_buf()
32 * region will be allocated else physically contiguous in exynos_drm_alloc_buf()
35 if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG)) in exynos_drm_alloc_buf()
42 if (exynos_gem->flags & EXYNOS_BO_WC || in exynos_drm_alloc_buf()
43 !(exynos_gem->flags & EXYNOS_BO_CACHABLE)) in exynos_drm_alloc_buf()
50 exynos_gem->dma_attrs = attr; in exynos_drm_alloc_buf()
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| D | exynos_drm_fb.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
8 * Seung-Woo Kim <sw0312.kim@samsung.com>
37 flags = exynos_gem->flags; in check_fb_gem_memory_type()
40 * Physically non-contiguous memory type for framebuffer is not in check_fb_gem_memory_type()
44 DRM_DEV_ERROR(drm_dev->dev, in check_fb_gem_memory_type()
45 "Non-contiguous GEM memory is not supported.\n"); in check_fb_gem_memory_type()
46 return -EINVAL; in check_fb_gem_memory_type()
69 return ERR_PTR(-ENOMEM); in exynos_drm_framebuffer_init()
76 fb->obj[i] = &exynos_gem[i]->base; in exynos_drm_framebuffer_init()
83 DRM_DEV_ERROR(dev->dev, in exynos_drm_framebuffer_init()
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| /kernel/linux/linux-6.6/drivers/gpu/drm/exynos/ |
| D | exynos_drm_gem.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
9 #include <linux/dma-buf.h>
27 struct drm_device *dev = exynos_gem->base.dev; in exynos_drm_alloc_buf()
30 if (exynos_gem->dma_addr) { in exynos_drm_alloc_buf()
36 * if EXYNOS_BO_CONTIG, fully physically contiguous memory in exynos_drm_alloc_buf()
37 * region will be allocated else physically contiguous in exynos_drm_alloc_buf()
40 if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG)) in exynos_drm_alloc_buf()
47 if (exynos_gem->flags & EXYNOS_BO_WC || in exynos_drm_alloc_buf()
48 !(exynos_gem->flags & EXYNOS_BO_CACHABLE)) in exynos_drm_alloc_buf()
55 exynos_gem->dma_attrs = attr; in exynos_drm_alloc_buf()
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|
| D | exynos_drm_fb.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
8 * Seung-Woo Kim <sw0312.kim@samsung.com>
37 flags = exynos_gem->flags; in check_fb_gem_memory_type()
40 * Physically non-contiguous memory type for framebuffer is not in check_fb_gem_memory_type()
44 DRM_DEV_ERROR(drm_dev->dev, in check_fb_gem_memory_type()
45 "Non-contiguous GEM memory is not supported.\n"); in check_fb_gem_memory_type()
46 return -EINVAL; in check_fb_gem_memory_type()
69 return ERR_PTR(-ENOMEM); in exynos_drm_framebuffer_init()
76 fb->obj[i] = &exynos_gem[i]->base; in exynos_drm_framebuffer_init()
83 DRM_DEV_ERROR(dev->dev, in exynos_drm_framebuffer_init()
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|
| /kernel/linux/linux-5.10/Documentation/vm/ |
| D | memory-model.rst | 1 .. SPDX-License-Identifier: GPL-2.0
11 spans a contiguous range up to the maximal address. It could be,
13 for the CPU. Then there could be several contiguous ranges at
29 Regardless of the selected memory model, there exists one-to-one
41 non-NUMA systems with contiguous, or mostly contiguous, physical
60 straightforward: `PFN - ARCH_PFN_OFFSET` is an index to the
82 Every `node_mem_map` behaves exactly as FLATMEM's `mem_map` -
96 page->flags.
108 as hot-plug and hot-remove of the physical memory, alternative memory
109 maps for non-volatile memory devices and deferred initialization of
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|
| /kernel/linux/linux-6.6/Documentation/core-api/ |
| D | dma-api.rst | 8 of the API (and actual examples), see Documentation/core-api/dma-api-howto.rst.
11 Part II describes extensions for supporting non-consistent memory
13 non-consistent platforms (this is usually only legacy platforms) you
16 Part I - dma_API
17 ----------------
19 To get the dma_API, you must #include <linux/dma-mapping.h>. This
27 Part Ia - Using large DMA-coherent buffers
28 ------------------------------------------
76 Part Ib - Using small DMA-coherent buffers
77 ------------------------------------------
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| /kernel/linux/linux-5.10/Documentation/admin-guide/mm/ |
| D | nommu-mmap.rst | 2 No-MMU memory mapping support
5 The kernel has limited support for memory mapping under no-MMU conditions, such
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
31 the no-MMU case doesn't support these, behaviour is identical to
39 In the no-MMU case:
41 - If one exists, the kernel will re-use an existing mapping to the
45 - If possible, the file mapping will be directly on the backing device
50 - If the backing device can't or won't permit direct sharing,
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| D | hugetlbpage.rst | 15 256M and ppc64 supports 4K and 16M. A TLB is a cache of virtual-to-physical
87 Once a number of huge pages have been pre-allocated to the kernel huge page
150 indicates the current number of pre-allocated huge pages of the default size.
161 task that modifies ``nr_hugepages``. The default for the allowed nodes--when the
162 task has default memory policy--is all on-line nodes with memory. Allowed
163 nodes with insufficient available, contiguous memory for a huge page will be
170 physically contiguous memory that is present in system at the time of the
173 allocating extra pages on other nodes with sufficient available contiguous
178 the boot process when the possibility of getting physical contiguous pages
187 requested by applications. Writing any non-zero value into this file
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|
| /kernel/linux/linux-6.6/Documentation/admin-guide/mm/ |
| D | nommu-mmap.rst | 2 No-MMU memory mapping support
5 The kernel has limited support for memory mapping under no-MMU conditions, such
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
31 the no-MMU case doesn't support these, behaviour is identical to
39 In the no-MMU case:
41 - If one exists, the kernel will re-use an existing mapping to the
45 - If possible, the file mapping will be directly on the backing device
50 - If the backing device can't or won't permit direct sharing,
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| /kernel/linux/linux-6.6/arch/sh/mm/ |
| D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0
9 Some SH processors (such as SH-2/SH-2A) lack an MMU. In order to
12 On other systems (such as the SH-3 and 4) where an MMU exists,
22 int "Order of maximal physically contiguous allocations"
29 contiguous allocations. The limit is called MAX_ORDER and it
31 allocated as a single contiguous block. This option allows
33 large blocks of physically contiguous memory is required.
77 bool "Support 32-bit physical addressing through PMB"
83 32-bits through the SH-4A PMB. If this is not set, legacy
84 29-bit physical addressing will be used.
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| /kernel/linux/linux-5.10/Documentation/driver-api/media/ |
| D | v4l2-videobuf.rst | 1 .. SPDX-License-Identifier: GPL-2.0
18 ------------
29 a consistent implementation of the V4L2 user-space API.
32 ------------
37 - Buffers which are scattered in both the physical and (kernel) virtual
38 address spaces. (Almost) all user-space buffers are like this, but it
39 makes great sense to allocate kernel-space buffers this way as well when
44 - Buffers which are physically scattered, but which are virtually
45 contiguous; buffers allocated with vmalloc(), in other words. These
47 useful in situations where DMA is not available but virtually-contiguous
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|
| /kernel/linux/linux-6.6/Documentation/driver-api/media/ |
| D | v4l2-videobuf.rst | 1 .. SPDX-License-Identifier: GPL-2.0
18 ------------
29 a consistent implementation of the V4L2 user-space API.
32 ------------
37 - Buffers which are scattered in both the physical and (kernel) virtual
38 address spaces. (Almost) all user-space buffers are like this, but it
39 makes great sense to allocate kernel-space buffers this way as well when
44 - Buffers which are physically scattered, but which are virtually
45 contiguous; buffers allocated with vmalloc(), in other words. These
47 useful in situations where DMA is not available but virtually-contiguous
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|
| /kernel/linux/linux-5.10/Documentation/userspace-api/media/v4l/ |
| D | pixfmt-nv16m.rst | 1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
3 .. _V4L2-PIX-FMT-NV16M:
4 .. _v4l2-pix-fmt-nv61m:
12 non contiguous in memory.
18 This is a multi-planar, two-plane version of the YUV 4:2:2 format. The
19 three components are separated into two sub-images or planes.
21 two planes are non-contiguous in memory, i.e. the chroma plane does not
32 used only in drivers and applications that support the multi-planar API,
33 described in :ref:`planar-apis`.
39 .. flat-table::
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| D | pixfmt-nv12m.rst | 1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
3 .. _V4L2-PIX-FMT-NV12M:
4 .. _v4l2-pix-fmt-nv12mt-16x16:
5 .. _V4L2-PIX-FMT-NV21M:
15 non contiguous in memory.
21 This is a multi-planar, two-plane version of the YUV 4:2:0 format. The
22 three components are separated into two sub-images or planes.
24 two planes are non-contiguous in memory, i.e. the chroma plane do not
40 applications that support the multi-planar API, described in
41 :ref:`planar-apis`.
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|
| /kernel/linux/linux-6.6/tools/perf/pmu-events/arch/arm64/ |
| D | common-and-microarch.json | 129 "PublicDescription": "Attributable Level 1 data cache write-back",
132 "BriefDescription": "Attributable Level 1 data cache write-back"
147 "PublicDescription": "Attributable Level 2 data cache write-back",
150 "BriefDescription": "Attributable Level 2 data cache write-back"
273 "PublicDescription": "Access to another socket in a multi-socket system",
276 "BriefDescription": "Access to another socket in a multi-socket system"
303 … "PublicDescription": "Attributable memory read access to another socket in a multi-socket system",
306 … "BriefDescription": "Attributable memory read access to another socket in a multi-socket system"
309 …"PublicDescription": "Level 1 data cache long-latency read miss. The counter counts each memory r…
312 "BriefDescription": "Level 1 data cache long-latency read miss"
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| /kernel/linux/linux-6.6/drivers/vfio/pci/ |
| D | vfio_pci_igd.c | 1 // SPDX-License-Identifier: GPL-2.0-only
8 * Register a device specific region through which to provide read-only
34 * igd_opregion_shift_copy() - Copy OpRegion to user buffer and shift position.
44 * Return: 0 on success, -EFAULT otherwise.
55 return -EFAULT; in igd_opregion_shift_copy()
59 *remaining -= bytes; in igd_opregion_shift_copy()
68 unsigned int i = VFIO_PCI_OFFSET_TO_INDEX(*ppos) - VFIO_PCI_NUM_REGIONS; in vfio_pci_igd_rw()
69 struct igd_opregion_vbt *opregionvbt = vdev->region[i].data; in vfio_pci_igd_rw()
73 if (pos >= vdev->region[i].size || iswrite) in vfio_pci_igd_rw()
74 return -EINVAL; in vfio_pci_igd_rw()
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|
| /kernel/linux/linux-6.6/Documentation/devicetree/bindings/arm/ |
| D | arm,coresight-catu.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/arm/arm,coresight-catu.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Mathieu Poirier <mathieu.poirier@linaro.org>
11 - Mike Leach <mike.leach@linaro.org>
12 - Leo Yan <leo.yan@linaro.org>
13 - Suzuki K Poulose <suzuki.poulose@arm.com>
26 translates contiguous Virtual Addresses (VAs) from an AXI master into
27 non-contiguous Physical Addresses (PAs) that are intended for system memory.
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| /kernel/linux/linux-6.6/mm/ |
| D | util.c | 1 // SPDX-License-Identifier: GPL-2.0-only
20 #include <linux/elf-randomize.h>
33 * kfree_const - conditionally free memory
46 * kstrdup - allocate space for and copy an existing string
70 * kstrdup_const - conditionally duplicate an existing const string
90 * kstrndup - allocate space for and copy an existing string
118 * kmemdup - duplicate region of memory
125 * result is physically contiguous. Use kfree() to free.
139 * kvmemdup - duplicate region of memory
146 * result may be not physically contiguous. Use kvfree() to free.
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|