| /linux/Documentation/userspace-api/media/v4l/ |
| H A D | mmap.rst | 18 Streaming is an I/O method where only pointers to buffers are exchanged
20 mapping is primarily intended to map buffers in device memory into the
24 drivers support streaming as well, allocating buffers in DMA-able main
27 A driver can support many sets of buffers. Each set is identified by a
32 To allocate device buffers applications call the
34 of buffers and buffer type, for example ``V4L2_BUF_TYPE_VIDEO_CAPTURE``.
35 This ioctl can also be used to change the number of buffers or to free
36 the allocated memory, provided none of the buffers are still mapped.
38 Before applications can access the buffers they must map them into their
40 location of the buffers in device memory can be determined with the
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| H A D | userp.rst | 19 methods. Buffers (planes) are allocated by the application itself, and
26 No buffers (planes) are allocated beforehand, consequently they are not
27 indexed and cannot be queried like mapped buffers with the
51 :ref:`VIDIOC_QBUF <VIDIOC_QBUF>` ioctl. Although buffers are commonly
60 Filled or displayed buffers are dequeued with the
66 Applications must take care not to free buffers without dequeuing.
67 Firstly, the buffers remain locked for longer, wasting physical memory.
73 buffers, to start capturing and enter the read loop. Here the
76 and enqueue buffers, when enough buffers are stacked up output is
78 buffers it must wait until an empty buffer can be dequeued and reused.
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| H A D | capture.c.rst | 52 struct buffer *buffers;
92 if (-1 == read(fd, buffers[0].start, buffers[0].length)) {
107 process_image(buffers[0].start, buffers[0].length);
133 process_image(buffers[buf.index].start, buf.bytesused);
161 if (buf.m.userptr == (unsigned long)buffers[i].start
162 && buf.length == buffers[i].length)
269 buf.m.userptr = (unsigned long)buffers[i].start;
270 buf.length = buffers[i].length;
288 free(buffers[0].start);
293 if (-1 == munmap(buffers[i].start, buffers[i].length))
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| H A D | dev-encoder.rst | 158 desired size of ``CAPTURE`` buffers; the encoder may adjust it to
170 adjusted size of ``CAPTURE`` buffers.
308 coded video. It does *not* set the rate at which buffers arrive on the
366 buffers to be aligned to 1920x1088 for codecs with 16x16 macroblock
376 7. Allocate buffers for both ``OUTPUT`` and ``CAPTURE`` via
382 requested number of buffers to allocate; greater than zero.
394 actual number of buffers allocated.
398 The actual number of allocated buffers may differ from the ``count``
404 To allocate more than the minimum number of OUTPUT buffers (for pipeline
406 control to get the minimum number of buffers required, and pass the
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| H A D | vidioc-reqbufs.rst | 36 Memory mapped buffers are located in device memory and must be allocated
38 space. User buffers are allocated by applications themselves, and this
40 to setup some internal structures. Similarly, DMABUF buffers are
45 To allocate device buffers applications initialize all fields of the
48 the desired number of buffers, ``memory`` must be set to the requested
51 allocate the requested number of buffers and it stores the actual number
54 number is also possible when the driver requires more buffers to
56 buffers, one displayed and one filled by the application.
62 buffers. Note that if any buffers are still mapped or exported via DMABUF,
66 If ``V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS`` is set, then these buffers are
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| H A D | dmabuf.rst | 10 The DMABUF framework provides a generic method for sharing buffers
19 exporting V4L2 buffers as DMABUF file descriptors.
25 importing DMA buffers through DMABUF file descriptors is supported is
29 This I/O method is dedicated to sharing DMA buffers between different
31 DRM). Buffers (planes) are allocated by a driver on behalf of an
32 application. Next, these buffers are exported to the application as file
63 buffers, every plane can be associated with a different DMABUF
64 descriptor. Although buffers are commonly cycled, applications can pass
121 Captured or displayed buffers are dequeued with the
129 buffers, to start capturing and enter the read loop. Here the
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| H A D | vidioc-create-bufs.rst | 13 VIDIOC_CREATE_BUFS - Create buffers for Memory Mapped or User Pointer or DMA Buffer I/O
34 This ioctl is used to create buffers for :ref:`memory mapped <mmap>`
38 over buffers is required. This ioctl can be called multiple times to
39 create buffers of different sizes.
41 To allocate the device buffers applications must initialize the relevant
43 ``count`` field must be set to the number of requested buffers, the
47 The ``format`` field specifies the image format that the buffers must be
54 sizes (for multi-planar formats) will be used for the allocated buffers.
58 The buffers created by this ioctl will have as minimum size the size
68 will attempt to allocate up to the requested number of buffers and store
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| H A D | dev-stateless-decoder.rst | 101 destination buffers parsed/decoded from the bytestream.
168 to obtain up-to-date information about the buffers size and layout.
170 6. Allocate source (bytestream) buffers via :c:func:`VIDIOC_REQBUFS` on
176 requested number of buffers to allocate; greater than zero.
187 actual number of buffers allocated.
190 minimum of required number of ``OUTPUT`` buffers for the given format and
192 to get the actual number of buffers allocated.
194 7. Allocate destination (raw format) buffers via :c:func:`VIDIOC_REQBUFS` on the
200 requested number of buffers to allocate; greater than zero. The client
201 is responsible for deducing the minimum number of buffers required
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| H A D | vidioc-streamon.rst | 43 Capture hardware is disabled and no input buffers are filled (if there
44 are any empty buffers in the incoming queue) until ``VIDIOC_STREAMON``
51 If ``VIDIOC_STREAMON`` fails then any already queued buffers will remain
55 in progress, unlocks any user pointer buffers locked in physical memory,
56 and it removes all buffers from the incoming and outgoing queues. That
63 If buffers have been queued with :ref:`VIDIOC_QBUF` and
65 ``VIDIOC_STREAMON``, then those queued buffers will also be removed from
77 but ``VIDIOC_STREAMOFF`` will return queued buffers to their starting
95 The buffer ``type`` is not supported, or no buffers have been
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| /linux/lib/xz/ |
| H A D | xz_dec_test.c | 41 * Input and output buffers. The input buffer is used as a temporary safe
48 * Structure to pass the input and output buffers to the XZ decoder.
51 static struct xz_buf buffers = { variable
74 buffers.in_pos = 0; in xz_dec_test_open()
75 buffers.in_size = 0; in xz_dec_test_open()
76 buffers.out_pos = 0; in xz_dec_test_open()
119 while ((remaining > 0 || buffers.out_pos == buffers.out_size) in xz_dec_test_write()
121 if (buffers.in_pos == buffers.in_size) { in xz_dec_test_write()
122 buffers.in_pos = 0; in xz_dec_test_write()
123 buffers.in_size = min(remaining, sizeof(buffer_in)); in xz_dec_test_write()
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| /linux/drivers/media/pci/ivtv/ |
| H A D | ivtv-queue.c | 35 q->buffers = 0; in ivtv_queue_init()
53 q->buffers++; in ivtv_enqueue()
68 q->buffers--; in ivtv_dequeue()
82 from->buffers--; in ivtv_queue_move_buf()
88 to->buffers++; in ivtv_queue_move_buf()
93 /* Move 'needed_bytes' worth of buffers from queue 'from' into queue 'to'.
94 If 'needed_bytes' == 0, then move all buffers from 'from' into 'to'.
95 If 'steal' != NULL, then buffers may also taken from that queue if
99 also cleared if buffers need to be taken from the 'steal' queue and
107 -ENOMEM is returned if the buffers could not be obtained, 0 if all
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| /linux/Documentation/userspace-api/media/dvb/ |
| H A D | dmx-reqbufs.rst | 38 Memory mapped buffers are located in device memory and must be allocated
40 space. User buffers are allocated by applications themselves, and this
42 to setup some internal structures. Similarly, DMABUF buffers are
47 To allocate device buffers applications initialize all fields of the
49 to the desired number of buffers, and ``size`` to the size of each
53 attempt to allocate the requested number of buffers and it stores the actual
55 number is also possible when the driver requires more buffers to
63 buffers, however this cannot succeed when any buffers are still mapped.
64 A ``count`` value of zero frees all buffers, after aborting or finishing
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| /linux/drivers/net/ethernet/intel/idpf/ |
| H A D | idpf_controlq_setup.c | 24 * idpf_ctlq_alloc_bufs - Allocate Control Queue (CQ) buffers
29 * queue, allocate DMA buffers
36 /* Do not allocate DMA buffers for transmit queues */ in idpf_ctlq_alloc_bufs()
41 * allocate the mapped buffers for the event processing in idpf_ctlq_alloc_bufs()
47 /* allocate the mapped buffers (except for the last one) */ in idpf_ctlq_alloc_bufs()
85 * This assumes the posted send buffers have already been cleaned
99 * Free the DMA buffers for RX queues, and DMA buffer header for both RX and TX
100 * queues. The upper layers are expected to manage freeing of TX DMA buffers
109 /* free DMA buffers for rx queues*/ in idpf_ctlq_free_bufs()
131 * Free the memory used by the ring, buffers and other related structures
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| /linux/Documentation/userspace-api/media/mediactl/ |
| H A D | request-api.rst | 21 on the media pipeline, reconfigure it for the next frame, queue the buffers to
28 specific buffers. This allows user-space to schedule several tasks ("requests")
59 instead of being immediately applied, and buffers queued to a request do not
65 Once the configuration and buffers of the request are specified, it can be
72 output buffers, not for capture buffers. Attempting to add a capture buffer
77 buffers are processed. Media controller drivers do a best effort implementation
82 It is not allowed to mix queuing requests with directly queuing buffers:
99 once all its associated buffers are available for dequeuing and all the
102 dequeue its buffers: buffers that are available halfway through a request can
135 to queue many such buffers in advance. It can also take advantage of requests'
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| /linux/drivers/iio/buffer/ |
| H A D | industrialio-hw-consumer.c | 19 * @buffers: hardware buffers list head.
23 struct list_head buffers; member
56 list_for_each_entry(buf, &hwc->buffers, head) { in iio_hw_consumer_get_buffer()
75 list_add_tail(&buf->head, &hwc->buffers); in iio_hw_consumer_get_buffer()
97 INIT_LIST_HEAD(&hwc->buffers); in iio_hw_consumer_alloc()
119 list_for_each_entry_safe(buf, tmp, &hwc->buffers, head) in iio_hw_consumer_alloc()
137 list_for_each_entry_safe(buf, n, &hwc->buffers, head) in iio_hw_consumer_free()
186 list_for_each_entry(buf, &hwc->buffers, head) { in iio_hw_consumer_enable()
195 list_for_each_entry_continue_reverse(buf, &hwc->buffers, hea in iio_hw_consumer_enable()
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| /linux/Documentation/admin-guide/media/ |
| H A D | cafe_ccic.rst | 37 buffers until the time comes to transfer data. If this option is set,
38 then worst-case-sized buffers will be allocated at module load time.
42 - dma_buf_size: The size of DMA buffers to allocate. Note that this
43 option is only consulted for load-time allocation; when buffers are
48 buffers. Normally, the driver tries to use three buffers; on faster
51 - min_buffers: The minimum number of streaming I/O buffers that the driver
56 - max_buffers: The maximum number of streaming I/O buffers; default is
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| /linux/drivers/android/ |
| H A D | binder_alloc.h | 22 * @entry: entry alloc->buffers
39 * Bookkeeping structure for binder transaction buffers
86 * @buffers: list of all buffers for this proc
87 * @free_buffers: rb tree of buffers available for allocation
89 * @allocated_buffers: rb tree of allocated buffers sorted by address
90 * @free_async_space: VA space available for async buffers. This is
103 * buffers. It is normally initialized during binder_init() and binder_mmap()
104 * calls. The address space is used for both user-visible buffers and for
105 * struct binder_buffer objects used to track the user buffers
111 struct list_head buffers; member
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| /linux/drivers/gpu/drm/xen/ |
| H A D | xen_drm_front.h | 27 * DOC: Driver modes of operation in terms of display buffers used
31 * host and guest environments, display buffers can be allocated by either
36 * DOC: Buffers allocated by the frontend driver
38 * In this mode of operation driver allocates buffers from system memory.
43 * buffers from the frontend driver.
47 * DOC: Buffers allocated by the backend
53 * requirements for display buffers it is possible to allocate such buffers
94 /* display buffers */
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| /linux/drivers/media/pci/cx18/ |
| H A D | cx18-queue.c | 242 /* Reset MDL id's and move all buffers back to the stream's buf_pool */ in cx18_unload_queues()
272 * Attach buffers to MDLs, give the MDLs ids, and add MDLs to q_free in cx18_load_queues()
274 * Excess buffers are left in buf_pool and/or on an MDL in q_idle in cx18_load_queues()
301 * case of a non-integral number of buffers to meet in cx18_load_queues()
313 /* Not enough buffers for this MDL; we won't use it */ in cx18_load_queues()
337 if (s->buffers == 0) in cx18_stream_alloc()
340 CX18_DEBUG_INFO("Allocate %s stream: %d x %d buffers (%d.%02d kB total)\n", in cx18_stream_alloc()
341 s->name, s->buffers, s->buf_size, in cx18_stream_alloc()
342 s->buffers * s->buf_size / 1024, in cx18_stream_alloc()
343 (s->buffers * s->buf_size * 100 / 1024) % 100); in cx18_stream_alloc()
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| /linux/Documentation/arch/x86/ |
| H A D | mds.rst | 10 on internal buffers in Intel CPUs. The variants are:
21 buffers are partitioned between Hyper-Threads so cross thread forwarding is
25 MFBDS leaks Fill Buffer Entries. Fill buffers are used internally to manage
27 to a memory or I/O operation. Fill buffers can forward data to a load
31 be exploited under certain conditions. Fill buffers are shared between
74 thread case (SMT off): Force the CPU to clear the affected buffers.
78 the affected CPU buffers when the VERW instruction is executed.
107 hope that it might actually clear the buffers. The state is reflected
142 When transitioning from kernel to user space the CPU buffers are flushed
153 Interrupts returning to kernel don't clear CPUs buffers since the
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| /linux/drivers/media/common/videobuf2/ |
| H A D | videobuf2-core.c | 389 * CAPTURE (aka "destination", bit 30 is 1) buffers. in __setup_offsets()
458 * video buffer memory for all buffers/planes on the queue and initializes the
460 * @first_index: index of the first created buffer, all newly allocated buffers
463 * Returns the number of buffers successfully allocated.
476 * Ensure that the number of already queue + the number of buffers already in __vb2_queue_alloc()
488 /* Try to find free space for less buffers */ in __vb2_queue_alloc()
492 /* If there is no space left to allocate buffers return 0 to indicate the error */ in __vb2_queue_alloc()
549 dprintk(q, 3, "allocated %d buffers, %d plane(s) each\n", in __vb2_queue_alloc()
557 * buffers in a given queue
569 /* Free MMAP buffers or release USERPTR buffers */ in __vb2_free_mem()
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| /linux/include/drm/ttm/ |
| H A D | ttm_execbuf_util.h | 76 * If the function returns 0, all buffers are marked as "unfenced",
80 * reserve the same buffers in reverse order, all threads except one will
83 * unreserve their buffers.
87 * buffers on the list will be reserved upon return.
89 * If dups is non NULL all buffers already reserved by the current thread
91 * on the first already reserved buffer and all buffers from the list are
94 * Buffers reserved by this function should be unreserved by
108 * @fence: The new exclusive fence for the buffers.
112 * It also unreserves all buffers, putting them on lru lists.
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| /linux/drivers/android/tests/ |
| H A D | binder_alloc_kunit.c | 166 struct binder_buffer *buffers[], in binder_alloc_test_alloc_buf() argument
173 buffers[i] = binder_alloc_new_buf(alloc, sizes[i], 0, 0, 0); in binder_alloc_test_alloc_buf()
174 if (IS_ERR(buffers[i]) || in binder_alloc_test_alloc_buf()
175 !check_buffer_pages_allocated(test, alloc, buffers[i], sizes[i])) in binder_alloc_test_alloc_buf()
184 struct binder_buffer *buffers[], in binder_alloc_test_free_buf() argument
191 binder_alloc_free_buf(alloc, buffers[seq[i]]); in binder_alloc_test_free_buf()
235 struct binder_buffer *buffers[BUFFER_NUM]; in binder_alloc_test_alloc_free() local
239 failures = binder_alloc_test_alloc_buf(test, alloc, buffers, in binder_alloc_test_alloc_free()
244 "Initial allocation failed: %lu/%u buffers with errors", in binder_alloc_test_alloc_free()
247 failures = binder_alloc_test_free_buf(test, alloc, buffers, in binder_alloc_test_alloc_free()
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| /linux/drivers/platform/raspberrypi/vchiq-mmal/ |
| H A D | mmal-vchiq.h | 39 unsigned int num; /* number of buffers */
40 u32 size; /* size of buffers */
41 u32 alignment; /* alignment of buffers */
71 /* data buffers to fill */
72 struct list_head buffers; member
73 /* lock to serialise adding and removing buffers from list */
76 /* Count of buffers the VPU has yet to return */
127 * disable a port will dequeue any pending buffers
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| /linux/Documentation/gpu/ |
| H A D | xen-front.rst | 9 Driver modes of operation in terms of display buffers used
13 :doc: Driver modes of operation in terms of display buffers used
15 Buffers allocated by the frontend driver
19 :doc: Buffers allocated by the frontend driver
21 Buffers allocated by the backend
25 :doc: Buffers allocated by the backend
|