diff options
Diffstat (limited to 'Documentation/admin-guide')
-rw-r--r-- | Documentation/admin-guide/cgroup-v1/cgroups.rst | 2 | ||||
-rw-r--r-- | Documentation/admin-guide/cgroup-v1/memcg_test.rst | 2 | ||||
-rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 33 | ||||
-rw-r--r-- | Documentation/admin-guide/media/ipu6-isys.rst | 161 | ||||
-rw-r--r-- | Documentation/admin-guide/media/ipu6_isys_graph.svg | 548 | ||||
-rw-r--r-- | Documentation/admin-guide/media/mgb4.rst | 35 | ||||
-rw-r--r-- | Documentation/admin-guide/media/v4l-drivers.rst | 1 |
7 files changed, 752 insertions, 30 deletions
diff --git a/Documentation/admin-guide/cgroup-v1/cgroups.rst b/Documentation/admin-guide/cgroup-v1/cgroups.rst index 9343148ee993..a3e2edb3d274 100644 --- a/Documentation/admin-guide/cgroup-v1/cgroups.rst +++ b/Documentation/admin-guide/cgroup-v1/cgroups.rst @@ -570,7 +570,7 @@ visible to cgroup_for_each_child/descendant_*() iterators. The subsystem may choose to fail creation by returning -errno. This callback can be used to implement reliable state sharing and propagation along the hierarchy. See the comment on -cgroup_for_each_descendant_pre() for details. +cgroup_for_each_live_descendant_pre() for details. ``void css_offline(struct cgroup *cgrp);`` (cgroup_mutex held by caller) diff --git a/Documentation/admin-guide/cgroup-v1/memcg_test.rst b/Documentation/admin-guide/cgroup-v1/memcg_test.rst index 1f128458ddea..9f8e27355cba 100644 --- a/Documentation/admin-guide/cgroup-v1/memcg_test.rst +++ b/Documentation/admin-guide/cgroup-v1/memcg_test.rst @@ -102,7 +102,7 @@ Under below explanation, we assume CONFIG_SWAP=y. The logic is very clear. (About migration, see below) Note: - __remove_from_page_cache() is called by remove_from_page_cache() + __filemap_remove_folio() is called by filemap_remove_folio() and __remove_mapping(). 6. Shmem(tmpfs) Page Cache diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index eaf9e66e472a..8fbb0519d556 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -1058,12 +1058,15 @@ cpufreq governor about the minimum desired frequency which should always be provided by a CPU, as well as the maximum desired frequency, which should not be exceeded by a CPU. -WARNING: cgroup2 doesn't yet support control of realtime processes and -the cpu controller can only be enabled when all RT processes are in -the root cgroup. Be aware that system management software may already -have placed RT processes into nonroot cgroups during the system boot -process, and these processes may need to be moved to the root cgroup -before the cpu controller can be enabled. +WARNING: cgroup2 doesn't yet support control of realtime processes. For +a kernel built with the CONFIG_RT_GROUP_SCHED option enabled for group +scheduling of realtime processes, the cpu controller can only be enabled +when all RT processes are in the root cgroup. This limitation does +not apply if CONFIG_RT_GROUP_SCHED is disabled. Be aware that system +management software may already have placed RT processes into nonroot +cgroups during the system boot process, and these processes may need +to be moved to the root cgroup before the cpu controller can be enabled +with a CONFIG_RT_GROUP_SCHED enabled kernel. CPU Interface Files @@ -1432,7 +1435,7 @@ PAGE_SIZE multiple when read back. sec_pagetables Amount of memory allocated for secondary page tables, this currently includes KVM mmu allocations on x86 - and arm64. + and arm64 and IOMMU page tables. percpu (npn) Amount of memory used for storing per-cpu kernel @@ -2190,11 +2193,25 @@ PID Interface Files Hard limit of number of processes. pids.current - A read-only single value file which exists on all cgroups. + A read-only single value file which exists on non-root cgroups. The number of processes currently in the cgroup and its descendants. + pids.peak + A read-only single value file which exists on non-root cgroups. + + The maximum value that the number of processes in the cgroup and its + descendants has ever reached. + + pids.events + A read-only flat-keyed file which exists on non-root cgroups. The + following entries are defined. Unless specified otherwise, a value + change in this file generates a file modified event. + + max + Number of times fork failed because limit was hit. + Organisational operations are not blocked by cgroup policies, so it is possible to have pids.current > pids.max. This can be done by either setting the limit to be smaller than pids.current, or attaching enough diff --git a/Documentation/admin-guide/media/ipu6-isys.rst b/Documentation/admin-guide/media/ipu6-isys.rst new file mode 100644 index 000000000000..0721e920b5e6 --- /dev/null +++ b/Documentation/admin-guide/media/ipu6-isys.rst @@ -0,0 +1,161 @@ +.. SPDX-License-Identifier: GPL-2.0 + +.. include:: <isonum.txt> + +======================================================== +Intel Image Processing Unit 6 (IPU6) Input System driver +======================================================== + +Copyright |copy| 2023--2024 Intel Corporation + +Introduction +============ + +This file documents the Intel IPU6 (6th generation Image Processing Unit) +Input System (MIPI CSI2 receiver) drivers located under +drivers/media/pci/intel/ipu6. + +The Intel IPU6 can be found in certain Intel SoCs but not in all SKUs: + +* Tiger Lake +* Jasper Lake +* Alder Lake +* Raptor Lake +* Meteor Lake + +Intel IPU6 is made up of two components - Input System (ISYS) and Processing +System (PSYS). + +The Input System mainly works as MIPI CSI-2 receiver which receives and +processes the image data from the sensors and outputs the frames to memory. + +There are 2 driver modules - intel-ipu6 and intel-ipu6-isys. intel-ipu6 is an +IPU6 common driver which does PCI configuration, firmware loading and parsing, +firmware authentication, DMA mapping and IPU-MMU (internal Memory mapping Unit) +configuration. intel_ipu6_isys implements V4L2, Media Controller and V4L2 +sub-device interfaces. The IPU6 ISYS driver supports camera sensors connected +to the IPU6 ISYS through V4L2 sub-device sensor drivers. + +.. Note:: See Documentation/driver-api/media/drivers/ipu6.rst for more + information about the IPU6 hardware. + +Input system driver +=================== + +The Input System driver mainly configures CSI-2 D-PHY, constructs the firmware +stream configuration, sends commands to firmware, gets response from hardware +and firmware and then returns buffers to user. The ISYS is represented as +several V4L2 sub-devices as well as video nodes. + +.. kernel-figure:: ipu6_isys_graph.svg + :alt: ipu6 isys media graph with multiple streams support + + IPU6 ISYS media graph with multiple streams support + +The graph has been produced using the following command: + +.. code-block:: none + + fdp -Gsplines=true -Tsvg < dot > dot.svg + +Capturing frames with IPU6 ISYS +------------------------------- + +IPU6 ISYS is used to capture frames from the camera sensors connected to the +CSI2 ports. The supported input formats of ISYS are listed in table below: + +.. tabularcolumns:: |p{0.8cm}|p{4.0cm}|p{4.0cm}| + +.. flat-table:: + :header-rows: 1 + + * - IPU6 ISYS supported input formats + + * - RGB565, RGB888 + + * - UYVY8, YUYV8 + + * - RAW8, RAW10, RAW12 + +.. _ipu6_isys_capture_examples: + +Examples +~~~~~~~~ + +Here is an example of IPU6 ISYS raw capture on Dell XPS 9315 laptop. On this +machine, ov01a10 sensor is connected to IPU ISYS CSI-2 port 2, which can +generate images at sBGGR10 with resolution 1280x800. + +Using the media controller APIs, we can configure ov01a10 sensor by +media-ctl [#f1]_ and yavta [#f2]_ to transmit frames to IPU6 ISYS. + +.. code-block:: none + + # Example 1 capture frame from ov01a10 camera sensor + # This example assumes /dev/media0 as the IPU ISYS media device + export MDEV=/dev/media0 + + # Establish the link for the media devices using media-ctl + media-ctl -d $MDEV -l "\"ov01a10 3-0036\":0 -> \"Intel IPU6 CSI2 2\":0[1]" + + # Set the format for the media devices + media-ctl -d $MDEV -V "ov01a10:0 [fmt:SBGGR10/1280x800]" + media-ctl -d $MDEV -V "Intel IPU6 CSI2 2:0 [fmt:SBGGR10/1280x800]" + media-ctl -d $MDEV -V "Intel IPU6 CSI2 2:1 [fmt:SBGGR10/1280x800]" + +Once the media pipeline is configured, desired sensor specific settings +(such as exposure and gain settings) can be set, using the yavta tool. + +e.g + +.. code-block:: none + + # and that ov01a10 sensor is connected to i2c bus 3 with address 0x36 + export SDEV=$(media-ctl -d $MDEV -e "ov01a10 3-0036") + + yavta -w 0x009e0903 400 $SDEV + yavta -w 0x009e0913 1000 $SDEV + yavta -w 0x009e0911 2000 $SDEV + +Once the desired sensor settings are set, frame captures can be done as below. + +e.g + +.. code-block:: none + + yavta --data-prefix -u -c10 -n5 -I -s 1280x800 --file=/tmp/frame-#.bin \ + -f SBGGR10 $(media-ctl -d $MDEV -e "Intel IPU6 ISYS Capture 0") + +With the above command, 10 frames are captured at 1280x800 resolution with +sBGGR10 format. The captured frames are available as /tmp/frame-#.bin files. + +Here is another example of IPU6 ISYS RAW and metadata capture from camera +sensor ov2740 on Lenovo X1 Yoga laptop. + +.. code-block:: none + + media-ctl -l "\"ov2740 14-0036\":0 -> \"Intel IPU6 CSI2 1\":0[1]" + media-ctl -l "\"Intel IPU6 CSI2 1\":1 -> \"Intel IPU6 ISYS Capture 0\":0[5]" + media-ctl -l "\"Intel IPU6 CSI2 1\":2 -> \"Intel IPU6 ISYS Capture 1\":0[5]" + + # set routing + media-ctl -v -R "\"Intel IPU6 CSI2 1\" [0/0->1/0[1],0/1->2/1[1]]" + + media-ctl -v "\"Intel IPU6 CSI2 1\":0/0 [fmt:SGRBG10/1932x1092]" + media-ctl -v "\"Intel IPU6 CSI2 1\":0/1 [fmt:GENERIC_8/97x1]" + media-ctl -v "\"Intel IPU6 CSI2 1\":1/0 [fmt:SGRBG10/1932x1092]" + media-ctl -v "\"Intel IPU6 CSI2 1\":2/1 [fmt:GENERIC_8/97x1]" + + CAPTURE_DEV=$(media-ctl -e "Intel IPU6 ISYS Capture 0") + ./yavta --data-prefix -c100 -n5 -I -s1932x1092 --file=/tmp/frame-#.bin \ + -f SGRBG10 ${CAPTURE_DEV} + + CAPTURE_META=$(media-ctl -e "Intel IPU6 ISYS Capture 1") + ./yavta --data-prefix -c100 -n5 -I -s97x1 -B meta-capture \ + --file=/tmp/meta-#.bin -f GENERIC_8 ${CAPTURE_META} + +References +========== + +.. [#f1] https://git.ideasonboard.org/media-ctl.git +.. [#f2] https://git.ideasonboard.org/yavta.git diff --git a/Documentation/admin-guide/media/ipu6_isys_graph.svg b/Documentation/admin-guide/media/ipu6_isys_graph.svg new file mode 100644 index 000000000000..c8539ef320d2 --- /dev/null +++ b/Documentation/admin-guide/media/ipu6_isys_graph.svg @@ -0,0 +1,548 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" + "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> +<!-- Generated by graphviz version 2.43.0 (0) + --> +<!-- Title: board Pages: 1 --> +<svg width="1703pt" height="1473pt" + viewBox="0.00 0.00 1703.00 1473.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> +<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 1469)"> +<title>board</title> +<polygon fill="white" stroke="transparent" points="-4,4 -4,-1469 1699,-1469 1699,4 -4,4"/> +<!-- n00000001 --> +<g id="node1" class="node"> +<title>n00000001</title> +<polygon fill="yellow" 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SPDX-License-Identifier: GPL-2.0 -==================== -mgb4 sysfs interface -==================== +The mgb4 driver +=============== + +sysfs interface +--------------- The mgb4 driver provides a sysfs interface, that is used to configure video stream related parameters (some of them must be set properly before the v4l2 @@ -12,9 +14,8 @@ There are two types of parameters - global / PCI card related, found under ``/sys/class/video4linux/videoX/device`` and module specific found under ``/sys/class/video4linux/videoX``. - Global (PCI card) parameters -============================ +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ **module_type** (R): Module type. @@ -42,9 +43,8 @@ Global (PCI card) parameters where each component is a 8b number. - Common FPDL3/GMSL input parameters -================================== +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ **input_id** (R): Input number ID, zero based. @@ -190,9 +190,8 @@ Common FPDL3/GMSL input parameters *Note: This parameter can not be changed while the input v4l2 device is open.* - Common FPDL3/GMSL output parameters -=================================== +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ **output_id** (R): Output number ID, zero based. @@ -282,9 +281,8 @@ Common FPDL3/GMSL output parameters Number of video lines between the end of the last valid pixel line (marked by DE=1) and assertion of the VSYNC signal. The default value is 2. - FPDL3 specific input parameters -=============================== +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ **fpdl3_input_width** (RW): Number of deserializer input lines. @@ -294,7 +292,7 @@ FPDL3 specific input parameters | 2 - dual FPDL3 specific output parameters -================================ +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ **fpdl3_output_width** (RW): Number of serializer output lines. @@ -304,7 +302,7 @@ FPDL3 specific output parameters | 2 - dual GMSL specific input parameters -============================== +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ **gmsl_mode** (RW): GMSL speed mode. @@ -328,10 +326,8 @@ GMSL specific input parameters | 0 - disabled | 1 - enabled (default) - -==================== -mgb4 mtd partitions -==================== +MTD partitions +-------------- The mgb4 driver creates a MTD device with two partitions: - mgb4-fw.X - FPGA firmware. @@ -344,9 +340,8 @@ also have a third partition named *mgb4-flash* available in the system. This partition represents the whole, unpartitioned, card's FLASH memory and one should not fiddle with it... -==================== -mgb4 iio (triggers) -==================== +IIO (triggers) +-------------- The mgb4 driver creates an Industrial I/O (IIO) device that provides trigger and signal level status capability. The following scan elements are available: diff --git a/Documentation/admin-guide/media/v4l-drivers.rst b/Documentation/admin-guide/media/v4l-drivers.rst index f4bb2605f07e..4120eded9a13 100644 --- a/Documentation/admin-guide/media/v4l-drivers.rst +++ b/Documentation/admin-guide/media/v4l-drivers.rst @@ -16,6 +16,7 @@ Video4Linux (V4L) driver-specific documentation imx imx7 ipu3 + ipu6-isys ivtv mgb4 omap3isp |