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| author | Tejun Heo <tj@kernel.org> | 2026-09-14 22:12:34 -1000 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2026-09-15 06:57:20 -1000 |
| commit | a9e3760b0838299649c0d57cca44daaf40ba3c33 (patch) | |
| tree | 95807ff0e511c05602ef34808cfc660303309057 /Documentation/gpu/amdgpu/display | |
| download | linux-stable-a9e3760b0838299649c0d57cca44daaf40ba3c33.tar.gz linux-stable-a9e3760b0838299649c0d57cca44daaf40ba3c33.zip | |
sched_ext: Maintain an online cid mask in the scheduler arenagrafted
Schedulers on the default cid mapping treat [0, nr_online_cids) as the
online set and restart on hotplug. Schedulers that install their own mapping
with scx_bpf_cid_override() have no way to learn which cids are online: the
count no longer identifies members and the CPU-form cpumask is unusable from
cid programs. This is an obvious hole in the cid API.
Add scx_bpf_online_cmask(), a kernel-maintained cmask in the scheduler's
arena, allocated alongside the per-CPU scratch masks and populated after the
cid mapping is finalized and before ops.init(), for child schedulers too.
The pointer stays valid through ops.exit() with no reference to take. It is
the arena offset as a void pointer, the same form struct_ops arena arguments
arrive in. The verifier types the void return as a scalar for the program's
arena cast.
The mask follows the SCX hotplug notifications: seeded from cpu_active_mask
and updated before ops.cid_online/offline() runs, so it lags cpu_online_mask
only inside a hotplug transition. Updates walk the scheduler list under the
lock that also serializes unlinking. Reads are live, not atomic snapshots.
Root initialization excludes hotplug.
v2: Reworded the getter kerneldoc (Andrea Righi).
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Diffstat (limited to 'Documentation/gpu/amdgpu/display')
24 files changed, 11537 insertions, 0 deletions
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section, you will find helpful information on debugging the amdgpu +driver from the display perspective. This page introduces debug mechanisms and +procedures to help you identify if some issues are related to display code. + +Narrow down display issues +========================== + +Since the display is the driver's visual component, it is common to see users +reporting issues as a display when another component causes the problem. This +section equips users to determine if a specific issue was caused by the display +component or another part of the driver. + +DC dmesg important messages +--------------------------- + +The dmesg log is the first source of information to be checked, and amdgpu +takes advantage of this feature by logging some valuable information. When +looking for the issues associated with amdgpu, remember that each component of +the driver (e.g., smu, PSP, dm, etc.) is loaded one by one, and this +information can be found in the dmesg log. In this sense, look for the part of +the log that looks like the below log snippet:: + + [ 4.254295] [drm] initializing kernel modesetting (IP DISCOVERY 0x1002:0x744C 0x1002:0x0E3B 0xC8). + [ 4.254718] [drm] register mmio base: 0xFCB00000 + [ 4.254918] [drm] register mmio size: 1048576 + [ 4.260095] [drm] add ip block number 0 <soc21_common> + [ 4.260318] [drm] add ip block number 1 <gmc_v11_0> + [ 4.260510] [drm] add ip block number 2 <ih_v6_0> + [ 4.260696] [drm] add ip block number 3 <psp> + [ 4.260878] [drm] add ip block number 4 <smu> + [ 4.261057] [drm] add ip block number 5 <dm> + [ 4.261231] [drm] add ip block number 6 <gfx_v11_0> + [ 4.261402] [drm] add ip block number 7 <sdma_v6_0> + [ 4.261568] [drm] add ip block number 8 <vcn_v4_0> + [ 4.261729] [drm] add ip block number 9 <jpeg_v4_0> + [ 4.261887] [drm] add ip block number 10 <mes_v11_0> + +From the above example, you can see the line that reports that `<dm>`, +(**Display Manager**), was loaded, which means that display can be part of the +issue. If you do not see that line, something else might have failed before +amdgpu loads the display component, indicating that we don't have a +display issue. + +After you identified that the DM was loaded correctly, you can check for the +display version of the hardware in use, which can be retrieved from the dmesg +log with the command:: + + dmesg | grep -i 'display core' + +This command shows a message that looks like this:: + + [ 4.655828] [drm] Display Core v3.2.285 initialized on DCN 3.2 + +This message has two key pieces of information: + +* **The DC version (e.g., v3.2.285)**: Display developers release a new DC version + every week, and this information can be advantageous in a situation where a + user/developer must find a good point versus a bad point based on a tested + version of the display code. Remember from page :ref:`Display Core <amdgpu-display-core>`, + that every week the new patches for display are heavily tested with IGT and + manual tests. +* **The DCN version (e.g., DCN 3.2)**: The DCN block is associated with the + hardware generation, and the DCN version conveys the hardware generation that + the driver is currently running. This information helps to narrow down the + code debug area since each DCN version has its files in the DC folder per DCN + component (from the example, the developer might want to focus on + files/folders/functions/structs with the dcn32 label might be executed). + However, keep in mind that DC reuses code across different DCN versions; for + example, it is expected to have some callbacks set in one DCN that are the same + as those from another DCN. In summary, use the DCN version just as a guide. + +From the dmesg file, it is also possible to get the ATOM bios code by using:: + + dmesg | grep -i 'ATOM BIOS' + +Which generates an output that looks like this:: + + [ 4.274534] amdgpu: ATOM BIOS: 113-D7020100-102 + +This type of information is useful to be reported. + +Avoid loading display core +-------------------------- + +Sometimes, it might be hard to figure out which part of the driver is causing +the issue; if you suspect that the display is not part of the problem and your +bug scenario is simple (e.g., some desktop configuration) you can try to remove +the display component from the equation. First, you need to identify `dm` ID +from the dmesg log; for example, search for the following log:: + + [ 4.254295] [drm] initializing kernel modesetting (IP DISCOVERY 0x1002:0x744C 0x1002:0x0E3B 0xC8). + [..] + [ 4.260095] [drm] add ip block number 0 <soc21_common> + [ 4.260318] [drm] add ip block number 1 <gmc_v11_0> + [..] + [ 4.261057] [drm] add ip block number 5 <dm> + +Notice from the above example that the `dm` id is 5 for this specific hardware. +Next, you need to run the following binary operation to identify the IP block +mask:: + + 0xffffffff & ~(1 << [DM ID]) + +From our example the IP mask is:: + + 0xffffffff & ~(1 << 5) = 0xffffffdf + +Finally, to disable DC, you just need to set the below parameter in your +bootloader:: + + amdgpu.ip_block_mask = 0xffffffdf + +If you can boot your system with the DC disabled and still see the issue, it +means you can rule DC out of the equation. However, if the bug disappears, you +still need to consider the DC part of the problem and keep narrowing down the +issue. In some scenarios, disabling DC is impossible since it might be +necessary to use the display component to reproduce the issue (e.g., play a +game). + +**Note: This will probably lead to the absence of a display output.** + +Display flickering +------------------ + +Display flickering might have multiple causes; one is the lack of proper power +to the GPU or problems in the DPM switches. A good first generic verification +is to set the GPU to use high voltage:: + + bash -c "echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level" + +The above command sets the GPU/APU to use the maximum power allowed which +disables DPM switches. If forcing DPM levels high does not fix the issue, it +is less likely that the issue is related to power management. If the issue +disappears, there is a good chance that other components might be involved, and +the display should not be ignored since this could be a DPM issues. From the +display side, if the power increase fixes the issue, it is worth debugging the +clock configuration and the pipe split police used in the specific +configuration. + +Display artifacts +----------------- + +Users may see some screen artifacts that can be categorized into two different +types: localized artifacts and general artifacts. The localized artifacts +happen in some specific areas, such as around the UI window corners; if you see +this type of issue, there is a considerable chance that you have a userspace +problem, likely Mesa or similar. The general artifacts usually happen on the +entire screen. They might be caused by a misconfiguration at the driver level +of the display parameters, but the userspace might also cause this issue. One +way to identify the source of the problem is to take a screenshot or make a +desktop video capture when the problem happens; after checking the +screenshot/video recording, if you don't see any of the artifacts, it means +that the issue is likely on the driver side. If you can still see the +problem in the data collected, it is an issue that probably happened during +rendering, and the display code just got the framebuffer already corrupted. + +Disabling/Enabling specific features +==================================== + +DC has a struct named `dc_debug_options`, which is statically initialized by +all DCE/DCN components based on the specific hardware characteristic. This +structure usually facilitates the bring-up phase since developers can start +with many disabled features and enable them individually. This is also an +important debug feature since users can change it when debugging specific +issues. + +For example, dGPU users sometimes see a problem where a horizontal fillet of +flickering happens in some specific part of the screen. This could be an +indication of Sub-Viewport issues; after the users identified the target DCN, +they can set the `force_disable_subvp` field to true in the statically +initialized version of `dc_debug_options` to see if the issue gets fixed. Along +the same lines, users/developers can also try to turn off `fams2_config` and +`enable_single_display_2to1_odm_policy`. In summary, the `dc_debug_options` is +an interesting form for identifying the problem. + +DC Visual Confirmation +====================== + +Display core provides a feature named visual confirmation, which is a set of +bars added at the scanout time by the driver to convey some specific +information. In general, you can enable this debug option by using:: + + echo <N> > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm + +Where `N` is an integer number for some specific scenarios that the developer +wants to enable, you will see some of these debug cases in the following +subsection. + +Multiple Planes Debug +--------------------- + +If you want to enable or debug multiple planes in a specific user-space +application, you can leverage a debug feature named visual confirm. For +enabling it, you will need:: + + echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm + +You need to reload your GUI to see the visual confirmation. When the plane +configuration changes or a full update occurs there will be a colored bar at +the bottom of each hardware plane being drawn on the screen. + +* The color indicates the format - For example, red is AR24 and green is NV12 +* The height of the bar indicates the index of the plane +* Pipe split can be observed if there are two bars with a difference in height + covering the same plane + +Consider the video playback case in which a video is played in a specific +plane, and the desktop is drawn in another plane. The video plane should +feature one or two green bars at the bottom of the video depending on pipe +split configuration. + +* There should **not** be any visual corruption +* There should **not** be any underflow or screen flashes +* There should **not** be any black screens +* There should **not** be any cursor corruption +* Multiple plane **may** be briefly disabled during window transitions or + resizing but should come back after the action has finished + +Pipe Split Debug +---------------- + +Sometimes we need to debug if DCN is splitting pipes correctly, and visual +confirmation is also handy for this case. Similar to the MPO case, you can use +the below command to enable visual confirmation:: + + echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm + +In this case, if you have a pipe split, you will see one small red bar at the +bottom of the display covering the entire display width and another bar +covering the second pipe. In other words, you will see a bit high bar in the +second pipe. + +DTN Debug +========= + +DC (DCN) provides an extensive log that dumps multiple details from our +hardware configuration. Via debugfs, you can capture those status values by +using Display Test Next (DTN) log, which can be captured via debugfs by using:: + + cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log + +Since this log is updated accordingly with DCN status, you can also follow the +change in real-time by using something like:: + + sudo watch -d cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log + +When reporting a bug related to DC, consider attaching this log before and +after you reproduce the bug. + +Collect Firmware information +============================ + +When reporting issues, it is important to have the firmware information since +it can be helpful for debugging purposes. To get all the firmware information, +use the command:: + + cat /sys/kernel/debug/dri/0/amdgpu_firmware_info + +From the display perspective, pay attention to the firmware of the DMCU and +DMCUB. + +DMUB Firmware Debug +=================== + +Sometimes, dmesg logs aren't enough. This is especially true if a feature is +implemented primarily in DMUB firmware. In such cases, all we see in dmesg when +an issue arises is some generic timeout error. So, to get more relevant +information, we can trace DMUB commands by enabling the relevant bits in +`amdgpu_dm_dmub_trace_mask`. + +Currently, we support the tracing of the following groups: + +Trace Groups +------------ + +.. csv-table:: + :header-rows: 1 + :widths: 1, 1 + :file: ./trace-groups-table.csv + +**Note: Not all ASICs support all of the listed trace groups** + +So, to enable just PSR tracing you can use the following command:: + + # echo 0x8020 > /sys/kernel/debug/dri/0/amdgpu_dm_dmub_trace_mask + +Then, you need to enable logging trace events to the buffer, which you can do +using the following:: + + # echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_dmcub_trace_event_en + +Lastly, after you are able to reproduce the issue you are trying to debug, +you can disable tracing and read the trace log by using the following:: + + # echo 0 > /sys/kernel/debug/dri/0/amdgpu_dm_dmcub_trace_event_en + # cat /sys/kernel/debug/dri/0/amdgpu_dm_dmub_tracebuffer + +So, when reporting bugs related to features such as PSR and ABM, consider +enabling the relevant bits in the mask before reproducing the issue and +attach the log that you obtain from the trace buffer in any bug reports that you +create. diff --git a/Documentation/gpu/amdgpu/display/dc-glossary.rst b/Documentation/gpu/amdgpu/display/dc-glossary.rst new file mode 100644 index 000000000..accb7c053 --- /dev/null +++ b/Documentation/gpu/amdgpu/display/dc-glossary.rst @@ -0,0 +1,228 @@ +=========== +DC Glossary +=========== + +On this page, we try to keep track of acronyms related to the display +component. If you do not find what you are looking for, look at the +'Documentation/gpu/amdgpu/amdgpu-glossary.rst'; if you cannot find it anywhere, +consider asking on the amd-gfx mailing list and update this page. + +.. glossary:: + + ABM + Adaptive Backlight Modulation + + APU + Accelerated Processing Unit + + ASIC + Application-Specific Integrated Circuit + + ASSR + Alternate Scrambler Seed Reset + + AZ + Azalia (HD audio DMA engine) + + BPC + Bits Per Colour/Component + + BPP + Bits Per Pixel + + Clocks + * PCLK: Pixel Clock + * SYMCLK: Symbol Clock + * SOCCLK: GPU Engine Clock + * DISPCLK: Display Clock + * DPPCLK: DPP Clock + * DCFCLK: Display Controller Fabric Clock + * REFCLK: Real Time Reference Clock + * PPLL: Pixel PLL + * FCLK: Fabric Clock + * MCLK: Memory Clock + + CRC + Cyclic Redundancy Check + + CRTC + Cathode Ray Tube Controller - commonly called "Controller" - Generates + raw stream of pixels, clocked at pixel clock + + CVT + Coordinated Video Timings + + DAL + Display Abstraction layer + + DC (Software) + Display Core + + DC (Hardware) + Display Controller + + DCC + Delta Colour Compression + + DCE + Display Controller Engine + + DCHUB + Display Controller HUB + + ARB + Arbiter + + VTG + Vertical Timing Generator + + DCN + Display Core Next + + DCCG + Display Clock Generator block + + DDC + Display Data Channel + + DIO + Display IO + + DPP + Display Pipes and Planes + + DSC + Display Stream Compression (Reduce the amount of bits to represent pixel + count while at the same pixel clock) + + dGPU + discrete GPU + + DMIF + Display Memory Interface + + DML + Display Mode Library + + DMCU + Display Micro-Controller Unit + + DMCUB + Display Micro-Controller Unit, version B + + DPCD + DisplayPort Configuration Data + + DPM(S) + Display Power Management (Signaling) + + DRR + Dynamic Refresh Rate + + DWB + Display Writeback + + FB + Frame Buffer + + FBC + Frame Buffer Compression + + FEC + Forward Error Correction + + FRL + Fixed Rate Link + + GCO + Graphical Controller Object + + GSL + Global Swap Lock + + iGPU + integrated GPU + + ISR + Interrupt Service Request + + ISV + Independent Software Vendor + + KMD + Kernel Mode Driver + + LB + Line Buffer + + LFC + Low Framerate Compensation + + LTTPR + Link Training Tunable Phy Repeater + + LUT + Lookup Table + + MALL + Memory Access at Last Level + + MPC/MPCC + Multiple pipes and plane combine + + MPO + Multi Plane Overlay + + MST + Multi Stream Transport + + NBP State + Northbridge Power State + + NBIO + North Bridge Input/Output + + ODM + Output Data Mapping + + OPM + Output Protection Manager + + OPP + Output Plane Processor + + OPTC + Output Pipe Timing Combiner + + OTG + Output Timing Generator + + PCON + Power Controller + + PGFSM + Power Gate Finite State Machine + + PSR + Panel Self Refresh + + SCL + Scaler + + SDP + Scalable Data Port + + SLS + Single Large Surface + + SST + Single Stream Transport + + TMDS + Transition-Minimized Differential Signaling + + TTU + Time to Underflow + + VRR + Variable Refresh Rate diff --git a/Documentation/gpu/amdgpu/display/dc_pipeline_overview.svg b/Documentation/gpu/amdgpu/display/dc_pipeline_overview.svg new file mode 100644 index 000000000..9adecebfe --- /dev/null +++ b/Documentation/gpu/amdgpu/display/dc_pipeline_overview.svg @@ -0,0 +1,1125 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!-- Created with Inkscape (http://www.inkscape.org/) --> + +<svg + xmlns:dc="http://purl.org/dc/elements/1.1/" + xmlns:cc="http://creativecommons.org/ns#" + xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" + xmlns:svg="http://www.w3.org/2000/svg" + xmlns="http://www.w3.org/2000/svg" + xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" + xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" + width="1296.7491" + height="741.97845" + viewBox="0 0 343.0982 196.31514" + version="1.1" + id="svg8" + inkscape:version="0.92.5 (2060ec1f9f, 2020-04-08)" + 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+ +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h + :doc: overview + +DPP +--- + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h + :doc: overview + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h + :internal: + +MPC +--- + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h + :doc: overview + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h + :internal: + :no-identifiers: mpcc_blnd_cfg mpcc_alpha_blend_mode + +OPP +--- + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/opp.h + :doc: overview + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/opp.h + :internal: + +DIO +--- + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_dio.c + :doc: overview + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_dio.c + :internal: diff --git a/Documentation/gpu/amdgpu/display/dcn-overview.rst b/Documentation/gpu/amdgpu/display/dcn-overview.rst new file mode 100644 index 000000000..eb54a6802 --- /dev/null +++ b/Documentation/gpu/amdgpu/display/dcn-overview.rst @@ -0,0 +1,232 @@ +.. _dcn_overview: + +======================= +Display Core Next (DCN) +======================= + +To equip our readers with the basic knowledge of how AMD Display Core Next +(DCN) works, we need to start with an overview of the hardware pipeline. Below +you can see a picture that provides a DCN overview, keep in mind that this is a +generic diagram, and we have variations per ASIC. + +.. kernel-figure:: dc_pipeline_overview.svg + +Based on this diagram, we can pass through each block and briefly describe +them: + +* **Display Controller Hub (DCHUB)**: This is the gateway between the Scalable + Data Port (SDP) and DCN. This component has multiple features, such as memory + arbitration, rotation, and cursor manipulation. + +* **Display Pipe and Plane (DPP)**: This block provides pre-blend pixel + processing such as color space conversion, linearization of pixel data, tone + mapping, and gamut mapping. + +* **Multiple Pipe/Plane Combined (MPC)**: This component performs blending of + multiple planes, using global or per-pixel alpha. + +* **Output Pixel Processing (OPP)**: Process and format pixels to be sent to + the display. + +* **Output Pipe Timing Combiner (OPTC)**: It generates time output to combine + streams or divide capabilities. CRC values are generated in this block. + +* **Display Output (DIO)**: Codify the output to the display connected to our + GPU. + +* **Display Writeback (DWB)**: It provides the ability to write the output of + the display pipe back to memory as video frames. + +* **Multi-Media HUB (MMHUBBUB)**: Memory controller interface for DMCUB and DWB + (Note that DWB is not hooked yet). + +* **DCN Management Unit (DMU)**: It provides registers with access control and + interrupts the controller to the SOC host interrupt unit. This block includes + the Display Micro-Controller Unit - version B (DMCUB), which is handled via + firmware. + +* **DCN Clock Generator Block (DCCG)**: It provides the clocks and resets + for all of the display controller clock domains. + +* **Azalia (AZ)**: Audio engine. + +The above diagram is an architecture generalization of DCN, which means that +every ASIC has variations around this base model. Notice that the display +pipeline is connected to the Scalable Data Port (SDP) via DCHUB; you can see +the SDP as the element from our Data Fabric that feeds the display pipe. + +Always approach the DCN architecture as something flexible that can be +configured and reconfigured in multiple ways; in other words, each block can be +setup or ignored accordingly with userspace demands. For example, if we +want to drive an 8k@60Hz with a DSC enabled, our DCN may require 4 DPP and 2 +OPP. It is DC's responsibility to drive the best configuration for each +specific scenario. Orchestrate all of these components together requires a +sophisticated communication interface which is highlighted in the diagram by +the edges that connect each block; from the chart, each connection between +these blocks represents: + +1. Pixel data interface (red): Represents the pixel data flow; +2. Global sync signals (green): It is a set of synchronization signals composed + by VStartup, VUpdate, and VReady; +3. Config interface: Responsible to configure blocks; +4. Sideband signals: All other signals that do not fit the previous one. + +These signals are essential and play an important role in DCN. Nevertheless, +the Global Sync deserves an extra level of detail described in the next +section. + +All of these components are represented by a data structure named dc_state. +From DCHUB to MPC, we have a representation called dc_plane; from MPC to OPTC, +we have dc_stream, and the output (DIO) is handled by dc_link. Keep in mind +that HUBP accesses a surface using a specific format read from memory, and our +dc_plane should work to convert all pixels in the plane to something that can +be sent to the display via dc_stream and dc_link. + +Front End and Back End +---------------------- + +Display pipeline can be broken down into two components that are usually +referred as **Front End (FE)** and **Back End (BE)**, where FE consists of: + +* DCHUB (Mainly referring to a subcomponent named HUBP) +* DPP +* MPC + +On the other hand, BE consist of + +* OPP +* OPTC +* DIO (DP/HDMI stream encoder and link encoder) + +OPP and OPTC are two joining blocks between FE and BE. On a side note, this is +a one-to-one mapping of the link encoder to PHY, but we can configure the DCN +to choose which link encoder to connect to which PHY. FE's main responsibility +is to change, blend and compose pixel data, while BE's job is to frame a +generic pixel stream to a specific display's pixel stream. + +Data Flow +--------- + +Initially, data is passed in from VRAM through Data Fabric (DF) in native pixel +formats. Such data format stays through till HUBP in DCHUB, where HUBP unpacks +different pixel formats and outputs them to DPP in uniform streams through 4 +channels (1 for alpha + 3 for colors). + +The Converter and Cursor (CNVC) in DPP would then normalize the data +representation and convert them to a DCN specific floating-point format (i.e., +different from the IEEE floating-point format). In the process, CNVC also +applies a degamma function to transform the data from non-linear to linear +space to relax the floating-point calculations following. Data would stay in +this floating-point format from DPP to OPP. + +Starting OPP, because color transformation and blending have been completed +(i.e alpha can be dropped), and the end sinks do not require the precision and +dynamic range that floating points provide (i.e. all displays are in integer +depth format), bit-depth reduction/dithering would kick in. In OPP, we would +also apply a regamma function to introduce the gamma removed earlier back. +Eventually, we output data in integer format at DIO. + +AMD Hardware Pipeline +--------------------- + +When discussing graphics on Linux, the **pipeline** term can sometimes be +overloaded with multiple meanings, so it is important to define what we mean +when we say **pipeline**. In the DCN driver, we use the term **hardware +pipeline** or **pipeline** or just **pipe** as an abstraction to indicate a +sequence of DCN blocks instantiated to address some specific configuration. DC +core treats DCN blocks as individual resources, meaning we can build a pipeline +by taking resources for all individual hardware blocks to compose one pipeline. +In actuality, we can't connect an arbitrary block from one pipe to a block from +another pipe; they are routed linearly, except for DSC, which can be +arbitrarily assigned as needed. We have this pipeline concept for trying to +optimize bandwidth utilization. + +.. kernel-figure:: pipeline_4k_no_split.svg + +Additionally, let's take a look at parts of the DTN log (see +'Documentation/gpu/amdgpu/display/dc-debug.rst' for more information) since +this log can help us to see part of this pipeline behavior in real-time:: + + HUBP: format addr_hi width height ... + [ 0]: 8h 81h 3840 2160 + [ 1]: 0h 0h 0 0 + [ 2]: 0h 0h 0 0 + [ 3]: 0h 0h 0 0 + [ 4]: 0h 0h 0 0 + ... + MPCC: OPP DPP ... + [ 0]: 0h 0h ... + +The first thing to notice from the diagram and DTN log it is the fact that we +have different clock domains for each part of the DCN blocks. In this example, +we have just a single **pipeline** where the data flows from DCHUB to DIO, as +we intuitively expect. Nonetheless, DCN is flexible, as mentioned before, and +we can split this single pipe differently, as described in the below diagram: + +.. kernel-figure:: pipeline_4k_split.svg + +Now, if we inspect the DTN log again we can see some interesting changes:: + + HUBP: format addr_hi width height ... + [ 0]: 8h 81h 1920 2160 ... + ... + [ 4]: 0h 0h 0 0 ... + [ 5]: 8h 81h 1920 2160 ... + ... + MPCC: OPP DPP ... + [ 0]: 0h 0h ... + [ 5]: 0h 5h ... + +From the above example, we now split the display pipeline into two vertical +parts of 1920x2160 (i.e., 3440x2160), and as a result, we could reduce the +clock frequency in the DPP part. This is not only useful for saving power but +also to better handle the required throughput. The idea to keep in mind here is +that the pipe configuration can vary a lot according to the display +configuration, and it is the DML's responsibility to set up all required +configuration parameters for multiple scenarios supported by our hardware. + +Global Sync +----------- + +Many DCN registers are double buffered, most importantly the surface address. +This allows us to update DCN hardware atomically for page flips, as well as +for most other updates that don't require enabling or disabling of new pipes. + +(Note: There are many scenarios when DC will decide to reserve extra pipes +in order to support outputs that need a very high pixel clock, or for +power saving purposes.) + +These atomic register updates are driven by global sync signals in DCN. In +order to understand how atomic updates interact with DCN hardware, and how DCN +signals page flip and vblank events it is helpful to understand how global sync +is programmed. + +Global sync consists of three signals, VSTARTUP, VUPDATE, and VREADY. These are +calculated by the Display Mode Library - DML (drivers/gpu/drm/amd/display/dc/dml) +based on a large number of parameters and ensure our hardware is able to feed +the DCN pipeline without underflows or hangs in any given system configuration. +The global sync signals always happen during VBlank, are independent from the +VSync signal, and do not overlap each other. + +VUPDATE is the only signal that is of interest to the rest of the driver stack +or userspace clients as it signals the point at which hardware latches to +atomically programmed (i.e. double buffered) registers. Even though it is +independent of the VSync signal we use VUPDATE to signal the VSync event as it +provides the best indication of how atomic commits and hardware interact. + +Since DCN hardware is double-buffered the DC driver is able to program the +hardware at any point during the frame. + +The below picture illustrates the global sync signals: + +.. kernel-figure:: global_sync_vblank.svg + +These signals affect core DCN behavior. Programming them incorrectly will lead +to a number of negative consequences, most of them quite catastrophic. + +The following picture shows how global sync allows for a mailbox style of +updates, i.e. it allows for multiple re-configurations between VUpdate +events where only the last configuration programmed before the VUpdate signal +becomes effective. + +.. kernel-figure:: config_example.svg diff --git a/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg b/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg new file mode 100644 index 000000000..315ffc5a1 --- /dev/null +++ b/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg @@ -0,0 +1,1370 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!-- Created with Inkscape (http://www.inkscape.org/) --> + +<svg + version="1.1" + id="svg2019" + width="1702" + height="1845" + viewBox="0 0 1702 1845" + sodipodi:docname="dcn2_cm_drm_current.svg" + inkscape:version="1.1.2 (0a00cf5339, 2022-02-04)" + 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x="867.34656" + y="1194.5068" + id="text184728"><tspan + sodipodi:role="line" + id="tspan184726" + x="867.34656" + y="1194.5068" /></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="389.01593" + y="159.8909" + id="text64469-9-3"><tspan + sodipodi:role="line" + id="tspan64467-2-6" + x="389.01593" + y="159.8909" + style="font-size:18.6667px">CNVC</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="365.88379" + y="303.59048" + id="text64469-9-1"><tspan + sodipodi:role="line" + id="tspan64467-2-2" + x="365.88379" + y="303.59048" + style="font-size:18.6667px">Input CSC</tspan></text> + <text + xml:space="preserve" + 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x="351.16684" + y="700.34918" + style="font-size:18.6667px">HDR Multiply</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="345.16684" + y="771.33112" + id="text64469-9-6"><tspan + sodipodi:role="line" + id="tspan64467-2-10" + x="345.16684" + y="771.33112" + style="font-size:18.6667px">Gamut Remap</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="412.5184" + y="836.04877" + id="text64469-9-63"><tspan + sodipodi:role="line" + id="tspan64467-2-20" + x="412.5184" + y="836.04877" + style="font-size:18.6667px;text-align:center;text-anchor:middle">Shaper LUT</tspan><tspan + sodipodi:role="line" + x="412.5184" + y="859.38214" + style="font-size:18.6667px;text-align:center;text-anchor:middle" + 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style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="874.5556" + y="773.42615" + id="text117309-6"><tspan + sodipodi:role="line" + id="tspan117307-7" + x="874.5556" + y="773.42615" + style="font-size:18.6667px">gamut_remap_matrix</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="913.72528" + y="846.55896" + id="text117309-5"><tspan + sodipodi:role="line" + id="tspan117307-3" + x="913.72528" + y="846.55896" + style="font-size:18.6667px">in_shaper_func</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="937.72528" + y="918.25787" + id="text117309-56"><tspan + sodipodi:role="line" + id="tspan117307-2" + x="937.72528" + y="918.25787" + style="font-size:18.6667px">lut3d_func</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="945.9895" + y="986.10767" + id="text117309-9"><tspan + sodipodi:role="line" + id="tspan117307-1" + x="945.9895" + y="986.10767" + style="font-size:18.6667px">blend_tf</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="975.91803" + y="1224.5564" + id="text137434"><tspan + sodipodi:role="line" + id="tspan137432" + x="975.91803" + y="1224.5564" + style="font-size:18.6667px">Blender</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + 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x="903.16278" + y="1642.1078" + style="font-size:18.6667px">bit_depth_param</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="939.31372" + y="1713.8068" + id="text137434-20"><tspan + sodipodi:role="line" + id="tspan137432-23" + x="939.31372" + y="1713.8068" + style="font-size:18.6667px">clamping</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="894.0307" + y="1782.5244" + id="text137434-7"><tspan + sodipodi:role="line" + id="tspan137432-5" + x="894.0307" + y="1782.5244" + style="font-size:18.6667px">output_color_space</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="869.63062" + y="117.7968" + id="text176429"><tspan + sodipodi:role="line" + id="tspan176427" + x="869.63062" + y="117.7968" + style="font-size:18.6667px">Plane</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="27.605465" + y="162.20587" + id="text176429-2"><tspan + sodipodi:role="line" + id="tspan176427-0" + x="27.605465" + y="162.20587" + style="font-size:18.6667px">Legend</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="298.63959" + y="59.293999" + id="text176429-9"><tspan + sodipodi:role="line" + id="tspan176427-2" + x="298.63959" + y="59.293999" + style="font-size:18.6667px">DCN 3.0</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="826.65735" + y="59.458061" + id="text176429-66"><tspan + sodipodi:role="line" + id="tspan176427-4" + x="826.65735" + y="59.458061" + style="font-size:18.6667px">DC Interface</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="1362.9948" + y="59.458061" + id="text176429-95"><tspan + sodipodi:role="line" + id="tspan176427-04" + x="1362.9948" + y="59.458061" + style="font-size:18.6667px">DRM Interface</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:40px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="867.34656" + y="1194.5068" + id="text184728"><tspan + sodipodi:role="line" + id="tspan184726" + x="867.34656" + y="1194.5068" /></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="389.01593" + y="159.8909" + id="text64469-9-3"><tspan + sodipodi:role="line" + id="tspan64467-2-6" + x="389.01593" + y="159.8909" + style="font-size:18.6667px">CNVC</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="365.88379" + y="303.59048" + id="text64469-9-1"><tspan + sodipodi:role="line" + id="tspan64467-2-2" + x="365.88379" + y="303.59048" + style="font-size:18.6667px">Input CSC</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="413.06488" + y="390.95001" + id="text64469-9-93"><tspan + sodipodi:role="line" + id="tspan64467-2-1" + x="413.06488" + y="390.95001" + style="font-size:18.6667px;text-align:center;text-anchor:middle">DeGamma</tspan><tspan + sodipodi:role="line" + x="413.06488" + y="414.28339" + style="font-size:18.6667px;text-align:center;text-anchor:middle" + id="tspan233797">ROM</tspan><tspan + sodipodi:role="line" + x="413.06488" + y="437.61676" + style="font-size:10.6667px;text-align:center;text-anchor:middle" + id="tspan233799">(sRGB, BT2020, Gamma 2.2,</tspan><tspan + sodipodi:role="line" + x="413.06488" + y="460.95013" + style="font-size:10.6667px;text-align:center;text-anchor:middle" + id="tspan242597">PQ, HLG)</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="372.44986" + y="538.83807" + id="text64469-9-94"><tspan + sodipodi:role="line" + id="tspan64467-2-78" + x="372.44986" + y="538.83807" + style="font-size:18.6667px">Post CSC</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:16px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="335.31775" + y="622.23511" + id="text64469-9-4"><tspan + sodipodi:role="line" + id="tspan64467-2-5" + x="335.31775" + y="622.23511" + style="font-size:16px">Gamma Correction</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="351.16684" + y="700.34918" + id="text64469-9-0"><tspan + sodipodi:role="line" + id="tspan64467-2-3" + x="351.16684" + y="700.34918" + style="font-size:18.6667px">HDR Multiply</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="345.16684" + y="771.33112" + id="text64469-9-6"><tspan + sodipodi:role="line" + id="tspan64467-2-10" + x="345.16684" + y="771.33112" + style="font-size:18.6667px">Gamut Remap</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="412.5184" + y="836.04877" + id="text64469-9-63"><tspan + sodipodi:role="line" + id="tspan64467-2-20" + x="412.5184" + y="836.04877" + style="font-size:18.6667px;text-align:center;text-anchor:middle">Shaper LUT</tspan><tspan + sodipodi:role="line" + x="412.5184" + y="859.38214" + style="font-size:18.6667px;text-align:center;text-anchor:middle" + id="tspan222533">RAM</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="413.54086" + y="908.61554" + id="text64469-9-61"><tspan + sodipodi:role="line" + id="tspan64467-2-55" + x="413.54086" + y="908.61554" + style="font-size:18.6667px;text-align:center;text-anchor:middle">3D LUT</tspan><tspan + sodipodi:role="line" + x="413.54086" + y="931.94891" + style="font-size:18.6667px;text-align:center;text-anchor:middle" + id="tspan221121">RAM</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="344.0347" + y="985.33319" + id="text64469-9-47"><tspan + sodipodi:role="line" + id="tspan64467-2-65" + x="344.0347" + y="985.33319" + style="font-size:18.6667px">Blend Gamma</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="433.84625" + y="1223.411" + id="text64469-9-69"><tspan + sodipodi:role="line" + id="tspan64467-2-37" + x="433.84625" + y="1223.411" + style="font-size:18.6667px">Blender</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="343.73291" + y="1290.2421" + id="text64469-9-45"><tspan + sodipodi:role="line" + id="tspan64467-2-25" + x="343.73291" + y="1290.2421" + style="font-size:18.6667px">Gamut Remap</tspan></text> + <text + xml:space="preserve" + style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" + x="408.74442" + y="1344.2428" + id="text64469-9-474"><tspan + sodipodi:role="line" + 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b/Documentation/gpu/amdgpu/display/display-contributing.rst @@ -0,0 +1,168 @@ +.. _display_todos: + +============================== +AMDGPU - Display Contributions +============================== + +First of all, if you are here, you probably want to give some technical +contribution to the display code, and for that, we say thank you :) + +This page summarizes some of the issues you can help with; keep in mind that +this is a static page, and it is always a good idea to try to reach developers +on the amd-gfx mailing list or some of the maintainers. Finally, this page +follows the DRM way of creating a TODO list; for more information, check +'Documentation/gpu/todo.rst'. + +Gitlab issues +============= + +Users can report issues associated with AMD GPUs at: + +- https://gitlab.freedesktop.org/drm/amd + +Usually, we try to add a proper label to all new tickets to make it easy to +filter issues. If you can reproduce any problem, you could help by adding more +information or fixing the issue. + +Level: diverse + +IGT +=== + +`IGT`_ provides many integration tests that can be run on your GPU. We always +want to pass a large set of tests to increase the test coverage in our CI. If +you wish to contribute to the display code but are unsure where a good place +is, we recommend you run all IGT tests and try to fix any failure you see in +your hardware. Keep in mind that this failure can be an IGT problem or a kernel +issue; it is necessary to analyze case-by-case. + +Level: diverse + +.. _IGT: https://gitlab.freedesktop.org/drm/igt-gpu-tools + +Compilation +=========== + +Fix compilation warnings +------------------------ + +Enable the W1 or W2 warning level in the kernel compilation and try to fix the +issues on the display side. + +Level: Starter + +Fix compilation issues when using um architecture +------------------------------------------------- + +Linux has a User-mode Linux (UML) feature, and the kernel can be compiled to +the **um** architecture. Compiling for **um** can bring multiple advantages +from the test perspective. We currently have some compilation issues in this +area that we need to fix. + +Level: Intermediate + +Code Refactor +============= + +Add prefix to DC functions to improve the debug with ftrace +----------------------------------------------------------- + +The Ftrace debug feature (check 'Documentation/trace/ftrace.rst') is a +fantastic way to check the code path when developers try to make sense of a +bug. Ftrace provides a filter mechanism that can be useful when the developer +has some hunch of which part of the code can cause the issue; for this reason, +if a set of functions has a proper prefix, it becomes easy to create a good +filter. Additionally, prefixes can improve stack trace readability. + +The DC code does not follow some prefix rules, which makes the Ftrace filter +more complicated and reduces the readability of the stack trace. If you want +something simple to start contributing to the display, you can make patches for +adding prefixes to DC functions. To create those prefixes, use part of the file +name as a prefix for all functions in the target file. Check the +'amdgpu_dm_crtc.c` and `amdgpu_dm_plane.c` for some references. However, we +strongly advise not to send huge patches changing these prefixes; otherwise, it +will be hard to review and test, which can generate second thoughts from +maintainers. Try small steps; in case of double, you can ask before you put in +effort. We recommend first looking at folders like dceXYZ, dcnXYZ, basics, +bios, core, clk_mgr, hwss, resource, and irq. + +Level: Starter + +Reduce code duplication +----------------------- + +AMD has an extensive portfolio with various dGPUs and APUs that amdgpu +supports. To maintain the new hardware release cadence, DCE/DCN was designed in +a modular design, making the bring-up for new hardware fast. Over the years, +amdgpu accumulated some technical debt in the code duplication area. For this +task, it would be a good idea to find a tool that can discover code duplication +(including patterns) and use it as guidance to reduce duplications. + +Level: Intermediate + +Make atomic_commit_[check|tail] more readable +--------------------------------------------- + +The functions responsible for atomic commit and tail are intricate and +extensive. In particular `amdgpu_dm_atomic_commit_tail` is a long function and +could benefit from being split into smaller helpers. Improvements in this area +are more than welcome, but keep in mind that changes in this area will affect +all ASICs, meaning that refactoring requires a comprehensive verification; in +other words, this effort can take some time for validation. + +Level: Advanced + +Documentation +============= + +Expand kernel-doc +----------------- + +Many DC functions do not have a proper kernel-doc; understanding a function and +adding documentation is a great way to learn more about the amdgpu driver and +also leave an outstanding contribution to the entire community. + +Level: Starter + +Beyond AMDGPU +============= + +AMDGPU provides features that are not yet enabled in the userspace. This +section highlights some of the coolest display features, which could be enabled +with the userspace developer helper. + +Enable underlay +--------------- + +AMD display has this feature called underlay (which you can read more about at +'Documentation/gpu/amdgpu/display/mpo-overview.rst') which is intended to +save power when playing a video. The basic idea is to put a video in the +underlay plane at the bottom and the desktop in the plane above it with a hole +in the video area. This feature is enabled in ChromeOS, and from our data +measurement, it can save power. + +Level: Unknown + +Adaptive Backlight Modulation (ABM) +----------------------------------- + +ABM is a feature that adjusts the display panel's backlight level and pixel +values depending on the displayed image. This power-saving feature can be very +useful when the system starts to run off battery; since this will impact the +display output fidelity, it would be good if this option was something that +users could turn on or off. + +Level: Unknown + + +HDR & Color management & VRR +---------------------------- + +HDR, Color Management, and VRR are huge topics and it's hard to put these into +concise ToDos. If you are interested in this topic, we recommend checking some +blog posts from the community developers to better understand some of the +specific challenges and people working on the subject. If anyone wants to work +on some particular part, we can try to help with some basic guidance. Finally, +keep in mind that we already have some kernel-doc in place for those areas. + +Level: Unknown diff --git a/Documentation/gpu/amdgpu/display/display-manager.rst b/Documentation/gpu/amdgpu/display/display-manager.rst new file mode 100644 index 000000000..b269ff3f7 --- /dev/null +++ b/Documentation/gpu/amdgpu/display/display-manager.rst @@ -0,0 +1,180 @@ +====================== +AMDgpu Display Manager +====================== + +.. contents:: Table of Contents + :depth: 3 + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :doc: overview + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h + :internal: + +Lifecycle +========= + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :doc: DM Lifecycle + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :functions: dm_hw_init dm_hw_fini + +Interrupts +========== + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c + :doc: overview + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c + :internal: + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :functions: register_hpd_handlers dm_crtc_high_irq dm_pflip_high_irq + +Atomic Implementation +===================== + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :doc: atomic + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c + :functions: amdgpu_dm_atomic_check amdgpu_dm_atomic_commit_tail + +Color Management Properties +=========================== + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c + :doc: overview + +.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c + :internal: + + +DC Color Capabilities between DCN generations +--------------------------------------------- + +DRM/KMS framework defines three CRTC color correction properties: degamma, +color transformation matrix (CTM) and gamma, and two properties for degamma and +gamma LUT sizes. AMD DC programs some of the color correction features +pre-blending but DRM/KMS has not per-plane color correction properties. + +In general, the DRM CRTC color properties are programmed to DC, as follows: +CRTC gamma after blending, and CRTC degamma pre-blending. Although CTM is +programmed after blending, it is mapped to DPP hw blocks (pre-blending). Other +color caps available in the hw is not currently exposed by DRM interface and +are bypassed. + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/dc.h + :doc: color-management-caps + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/dc.h + :internal: + +The color pipeline has undergone major changes between DCN hardware +generations. What's possible to do before and after blending depends on +hardware capabilities, as illustrated below by the DCN 2.0 and DCN 3.0 families +schemas. + +**DCN 2.0 family color caps and mapping** + +.. kernel-figure:: dcn2_cm_drm_current.svg + +**DCN 3.0 family color caps and mapping** + +.. kernel-figure:: dcn3_cm_drm_current.svg + +Blend Mode Properties +===================== + +Pixel blend mode is a DRM plane composition property of :c:type:`drm_plane` used to +describes how pixels from a foreground plane (fg) are composited with the +background plane (bg). Here, we present main concepts of DRM blend mode to help +to understand how this property is mapped to AMD DC interface. See more about +this DRM property and the alpha blending equations in :ref:`DRM Plane +Composition Properties <plane_composition_properties>`. + +Basically, a blend mode sets the alpha blending equation for plane +composition that fits the mode in which the alpha channel affects the state of +pixel color values and, therefore, the resulted pixel color. For +example, consider the following elements of the alpha blending equation: + +- *fg.rgb*: Each of the RGB component values from the foreground's pixel. +- *fg.alpha*: Alpha component value from the foreground's pixel. +- *bg.rgb*: Each of the RGB component values from the background. +- *plane_alpha*: Plane alpha value set by the **plane "alpha" property**, see + more in :ref:`DRM Plane Composition Properties <plane_composition_properties>`. + +in the basic alpha blending equation:: + + out.rgb = alpha * fg.rgb + (1 - alpha) * bg.rgb + +the alpha channel value of each pixel in a plane is ignored and only the plane +alpha affects the resulted pixel color values. + +DRM has three blend mode to define the blend formula in the plane composition: + +* **None**: Blend formula that ignores the pixel alpha. + +* **Pre-multiplied**: Blend formula that assumes the pixel color values in a + plane was already pre-multiplied by its own alpha channel before storage. + +* **Coverage**: Blend formula that assumes the pixel color values were not + pre-multiplied with the alpha channel values. + +and pre-multiplied is the default pixel blend mode, that means, when no blend +mode property is created or defined, DRM considers the plane's pixels has +pre-multiplied color values. On IGT GPU tools, the kms_plane_alpha_blend test +provides a set of subtests to verify plane alpha and blend mode properties. + +The DRM blend mode and its elements are then mapped by AMDGPU display manager +(DM) to program the blending configuration of the Multiple Pipe/Plane Combined +(MPC), as follows: + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h + :identifiers: mpcc_blnd_cfg + +Therefore, the blending configuration for a single MPCC instance on the MPC +tree is defined by :c:type:`mpcc_blnd_cfg`, where +:c:type:`pre_multiplied_alpha` is the alpha pre-multiplied mode flag used to +set :c:type:`MPCC_ALPHA_MULTIPLIED_MODE`. It controls whether alpha is +multiplied (true/false), being only true for DRM pre-multiplied blend mode. +:c:type:`mpcc_alpha_blend_mode` defines the alpha blend mode regarding pixel +alpha and plane alpha values. It sets one of the three modes for +:c:type:`MPCC_ALPHA_BLND_MODE`, as described below. + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h + :identifiers: mpcc_alpha_blend_mode + +DM then maps the elements of `enum mpcc_alpha_blend_mode` to those in the DRM +blend formula, as follows: + +* *MPC pixel alpha* matches *DRM fg.alpha* as the alpha component value + from the plane's pixel +* *MPC global alpha* matches *DRM plane_alpha* when the pixel alpha should + be ignored and, therefore, pixel values are not pre-multiplied +* *MPC global gain* assumes *MPC global alpha* value when both *DRM + fg.alpha* and *DRM plane_alpha* participate in the blend equation + +In short, *fg.alpha* is ignored by selecting +:c:type:`MPCC_ALPHA_BLEND_MODE_GLOBAL_ALPHA`. On the other hand, (plane_alpha * +fg.alpha) component becomes available by selecting +:c:type:`MPCC_ALPHA_BLEND_MODE_PER_PIXEL_ALPHA_COMBINED_GLOBAL_GAIN`. And the +:c:type:`MPCC_ALPHA_MULTIPLIED_MODE` defines if the pixel color values are +pre-multiplied by alpha or not. + +Blend configuration flow +------------------------ + +The alpha blending equation is configured from DRM to DC interface by the +following path: + +1. When updating a :c:type:`drm_plane_state <drm_plane_state>`, DM calls + :c:type:`amdgpu_dm_plane_fill_blending_from_plane_state()` that maps + :c:type:`drm_plane_state <drm_plane_state>` attributes to + :c:type:`dc_plane_info <dc_plane_info>` struct to be handled in the + OS-agnostic component (DC). + +2. 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a/Documentation/gpu/amdgpu/display/index.rst b/Documentation/gpu/amdgpu/display/index.rst new file mode 100644 index 000000000..bd2d797c1 --- /dev/null +++ b/Documentation/gpu/amdgpu/display/index.rst @@ -0,0 +1,97 @@ +.. _amdgpu-display-core: + +=================================== +drm/amd/display - Display Core (DC) +=================================== + +AMD display engine is partially shared with other operating systems; for this +reason, our Display Core Driver is divided into two pieces: + +#. **Display Core (DC)** contains the OS-agnostic components. Things like + hardware programming and resource management are handled here. +#. **Display Manager (DM)** contains the OS-dependent components. Hooks to the + amdgpu base driver and DRM are implemented here. For example, you can check + display/amdgpu_dm/ folder. + +------------------ +DC Code validation +------------------ + +Maintaining the same code base across multiple OSes requires a lot of +synchronization effort between repositories and exhaustive validation. In the +DC case, we maintain a tree to centralize code from different parts. The shared +repository has integration tests with our Internal Linux CI farm, and we run a +comprehensive set of IGT tests in various AMD GPUs/APUs (mostly recent dGPUs +and APUs). Our CI also checks ARM64/32, PPC64/32, and x86_64/32 compilation +with DCN enabled and disabled. + +When we upstream a new feature or some patches, we pack them in a patchset with +the prefix **DC Patches for <DATE>**, which is created based on the latest +`amd-staging-drm-next <https://gitlab.freedesktop.org/agd5f/linux>`_. All of +those patches are under a DC version tested as follows: + +* Ensure that every patch compiles and the entire series pass our set of IGT + test in different hardware. +* Prepare a branch with those patches for our validation team. If there is an + error, a developer will debug as fast as possible; usually, a simple bisect + in the series is enough to point to a bad change, and two possible actions + emerge: fix the issue or drop the patch. If it is not an easy fix, the bad + patch is dropped. +* Finally, developers wait a few days for community feedback before we merge + the series. + +It is good to stress that the test phase is something that we take extremely +seriously, and we never merge anything that fails our validation. Follows an +overview of our test set: + +#. Manual test + * Multiple Hotplugs with DP and HDMI. + * Stress test with multiple display configuration changes via the user interface. + * Validate VRR behaviour. + * Check PSR. + * Validate MPO when playing video. + * Test more than two displays connected at the same time. + * Check suspend/resume. + * Validate FPO. + * Check MST. +#. Automated test + * IGT tests in a farm with GPUs and APUs that support DCN and DCE. + * Compilation validation with the latest GCC and Clang from LTS distro. + * Cross-compilation for PowerPC 64/32, ARM 64/32, and x86 32. + +In terms of test setup for CI and manual tests, we usually use: + +#. The latest Ubuntu LTS. +#. In terms of userspace, we only use fully updated open-source components + provided by the distribution official package manager. +#. Regarding IGT, we use the latest code from the upstream. +#. Most of the manual tests are conducted in the GNome but we also use KDE. + +Notice that someone from our test team will always reply to the cover letter +with the test report. + +-------------- +DC Information +-------------- + +The display pipe is responsible for "scanning out" a rendered frame from the +GPU memory (also called VRAM, FrameBuffer, etc.) to a display. In other words, +it would: + +#. Read frame information from memory; +#. Perform required transformation; +#. 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id="path1551-3-2" + inkscape:connector-curvature="0" + sodipodi:nodetypes="cc" /> + <path + style="fill:none;stroke:#000000;stroke-width:1.53318286;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-end:url(#Arrow1Send-9-6-9)" + d="m -59.637503,50.169684 h 9.260618" + id="path1551-3-2-1" + inkscape:connector-curvature="0" + sodipodi:nodetypes="cc" /> + </g> + </g> +</svg> diff --git a/Documentation/gpu/amdgpu/display/mpo-overview.rst b/Documentation/gpu/amdgpu/display/mpo-overview.rst new file mode 100644 index 000000000..59a4f54a3 --- /dev/null +++ b/Documentation/gpu/amdgpu/display/mpo-overview.rst @@ -0,0 +1,242 @@ +======================== +Multiplane Overlay (MPO) +======================== + +.. note:: You will get more from this page if you have already read the + 'Documentation/gpu/amdgpu/display/dcn-overview.rst'. + + +Multiplane Overlay (MPO) allows for multiple framebuffers to be composited via +fixed-function hardware in the display controller rather than using graphics or +compute shaders for composition. This can yield some power savings if it means +the graphics/compute pipelines can be put into low-power states. In summary, +MPO can bring the following benefits: + +* Decreased GPU and CPU workload - no composition shaders needed, no extra + buffer copy needed, GPU can remain idle. +* Plane independent page flips - No need to be tied to global compositor + page-flip present rate, reduced latency, independent timing. + +.. note:: Keep in mind that MPO is all about power-saving; if you want to learn + more about power-save in the display context, check the link: + `Power <https://gitlab.freedesktop.org/pq/color-and-hdr/-/blob/main/doc/power.rst>`__. + +Multiplane Overlay is only available using the DRM atomic model. The atomic +model only uses a single userspace IOCTL for configuring the display hardware +(modesetting, page-flipping, etc) - drmModeAtomicCommit. To query hardware +resources and limitations userspace also calls into drmModeGetResources which +reports back the number of planes, CRTCs, and connectors. There are three types +of DRM planes that the driver can register and work with: + +* ``DRM_PLANE_TYPE_PRIMARY``: Primary planes represent a "main" plane for a + CRTC, primary planes are the planes operated upon by CRTC modesetting and + flipping operations. +* ``DRM_PLANE_TYPE_CURSOR``: Cursor planes represent a "cursor" plane for a + CRTC. Cursor planes are the planes operated upon by the cursor IOCTLs +* ``DRM_PLANE_TYPE_OVERLAY``: Overlay planes represent all non-primary, + non-cursor planes. Some drivers refer to these types of planes as "sprites" + internally. + +To illustrate how it works, let's take a look at a device that exposes the +following planes to userspace: + +* 4 Primary planes (1 per CRTC). +* 4 Cursor planes (1 per CRTC). +* 1 Overlay plane (shared among CRTCs). + +.. note:: Keep in mind that different ASICs might expose other numbers of + planes. + +For this hardware example, we have 4 pipes (if you don't know what AMD pipe +means, look at 'Documentation/gpu/amdgpu/display/dcn-overview.rst', section +"AMD Hardware Pipeline"). Typically most AMD devices operate in a pipe-split +configuration for optimal single display output (e.g., 2 pipes per plane). + +A typical MPO configuration from userspace - 1 primary + 1 overlay on a single +display - will see 4 pipes in use, 2 per plane. + +At least 1 pipe must be used per plane (primary and overlay), so for this +hypothetical hardware that we are using as an example, we have an absolute +limit of 4 planes across all CRTCs. Atomic commits will be rejected for display +configurations using more than 4 planes. Again, it is important to stress that +every DCN has different restrictions; here, we are just trying to provide the +concept idea. + +Plane Restrictions +================== + +AMDGPU imposes restrictions on the use of DRM planes in the driver. + +Atomic commits will be rejected for commits which do not follow these +restrictions: + +* Overlay planes must be in ARGB8888 or XRGB8888 format +* Planes cannot be placed outside of the CRTC destination rectangle +* Planes cannot be downscaled more than 1/4x of their original size +* Planes cannot be upscaled more than 16x of their original size + +Not every property is available on every plane: + +* Only primary planes have color-space and non-RGB format support +* Only overlay planes have alpha blending support + +Cursor Restrictions +=================== + +Before we start to describe some restrictions around cursor and MPO, see the +below image: + +.. kernel-figure:: mpo-cursor.svg + +The image on the left side represents how DRM expects the cursor and planes to +be blended. However, AMD hardware handles cursors differently, as you can see +on the right side; basically, our cursor cannot be drawn outside its associated +plane as it is being treated as part of the plane. Another consequence of that +is that cursors inherit the color and scale from the plane. + +As a result of the above behavior, do not use legacy API to set up the cursor +plane when working with MPO; otherwise, you might encounter unexpected +behavior. + +In short, AMD HW has no dedicated cursor planes. A cursor is attached to +another plane and therefore inherits any scaling or color processing from its +parent plane. + +Use Cases +========= + +Picture-in-Picture (PIP) playback - Underlay strategy +----------------------------------------------------- + +Video playback should be done using the "primary plane as underlay" MPO +strategy. This is a 2 planes configuration: + +* 1 YUV DRM Primary Plane (e.g. NV12 Video) +* 1 RGBA DRM Overlay Plane (e.g. ARGB8888 desktop). The compositor should + prepare the framebuffers for the planes as follows: + - The overlay plane contains general desktop UI, video player controls, and video subtitles + - Primary plane contains one or more videos + +.. note:: Keep in mind that we could extend this configuration to more planes, + but that is currently not supported by our driver yet (maybe if we have a + userspace request in the future, we can change that). + +See below a single-video example: + +.. kernel-figure:: single-display-mpo.svg + +.. note:: We could extend this behavior to more planes, but that is currently + not supported by our driver. + +The video buffer should be used directly for the primary plane. The video can +be scaled and positioned for the desktop using the properties: CRTC_X, CRTC_Y, +CRTC_W, and CRTC_H. The primary plane should also have the color encoding and +color range properties set based on the source content: + +* ``COLOR_RANGE``, ``COLOR_ENCODING`` + +The overlay plane should be the native size of the CRTC. The compositor must +draw a transparent cutout for where the video should be placed on the desktop +(i.e., set the alpha to zero). The primary plane video will be visible through +the underlay. The overlay plane's buffer may remain static while the primary +plane's framebuffer is used for standard double-buffered playback. + +The compositor should create a YUV buffer matching the native size of the CRTC. +Each video buffer should be composited onto this YUV buffer for direct YUV +scanout. The primary plane should have the color encoding and color range +properties set based on the source content: ``COLOR_RANGE``, +``COLOR_ENCODING``. However, be mindful that the source color space and +encoding match for each video since it affect the entire plane. + +The overlay plane should be the native size of the CRTC. The compositor must +draw a transparent cutout for where each video should be placed on the desktop +(i.e., set the alpha to zero). The primary plane videos will be visible through +the underlay. The overlay plane's buffer may remain static while compositing +operations for video playback will be done on the video buffer. + +This kernel interface is validated using IGT GPU Tools. The following tests can +be run to validate positioning, blending, scaling under a variety of sequences +and interactions with operations such as DPMS and S3: + +- ``kms_plane@plane-panning-bottom-right-pipe-*-planes`` +- ``kms_plane@plane-panning-bottom-right-suspend-pipe-*-`` +- ``kms_plane@plane-panning-top-left-pipe-*-`` +- ``kms_plane@plane-position-covered-pipe-*-`` +- ``kms_plane@plane-position-hole-dpms-pipe-*-`` +- ``kms_plane@plane-position-hole-pipe-*-`` +- ``kms_plane_multiple@atomic-pipe-*-tiling-`` +- ``kms_plane_scaling@pipe-*-plane-scaling`` +- ``kms_plane_alpha_blend@pipe-*-alpha-basic`` +- ``kms_plane_alpha_blend@pipe-*-alpha-transparant-fb`` +- ``kms_plane_alpha_blend@pipe-*-alpha-opaque-fb`` +- ``kms_plane_alpha_blend@pipe-*-constant-alpha-min`` +- ``kms_plane_alpha_blend@pipe-*-constant-alpha-mid`` +- ``kms_plane_alpha_blend@pipe-*-constant-alpha-max`` + +Multiple Display MPO +-------------------- + +AMDGPU supports display MPO when using multiple displays; however, this feature +behavior heavily relies on the compositor implementation. Keep in mind that +userspace can define different policies. For example, some OSes can use MPO to +protect the plane that handles the video playback; notice that we don't have +many limitations for a single display. Nonetheless, this manipulation can have +many more restrictions for a multi-display scenario. The below example shows a +video playback in the middle of two displays, and it is up to the compositor to +define a policy on how to handle it: + +.. kernel-figure:: multi-display-hdcp-mpo.svg + +Let's discuss some of the hardware limitations we have when dealing with +multi-display with MPO. + +Limitations +~~~~~~~~~~~ + +For simplicity's sake, for discussing the hardware limitation, this +documentation supposes an example where we have two displays and video playback +that will be moved around different displays. + +* **Hardware limitations** + +From the DCN overview page, each display requires at least one pipe and each +MPO plane needs another pipe. As a result, when the video is in the middle of +the two displays, we need to use 2 pipes. See the example below where we avoid +pipe split: + +- 1 display (1 pipe) + MPO (1 pipe), we will use two pipes +- 2 displays (2 pipes) + MPO (1-2 pipes); we will use 4 pipes. MPO in the + middle of both displays needs 2 pipes. +- 3 Displays (3 pipes) + MPO (1-2 pipes), we need 5 pipes. + +If we use MPO with multiple displays, the userspace has to decide to enable +multiple MPO by the price of limiting the number of external displays supported +or disable it in favor of multiple displays; it is a policy decision. For +example: + +* When ASIC has 3 pipes, AMD hardware can NOT support 2 displays with MPO +* When ASIC has 4 pipes, AMD hardware can NOT support 3 displays with MPO + +Let's briefly explore how userspace can handle these two display configurations +on an ASIC that only supports three pipes. We can have: + +.. kernel-figure:: multi-display-hdcp-mpo-less-pipe-ex.svg + +- Total pipes are 3 +- User lights up 2 displays (2 out of 3 pipes are used) +- User launches video (1 pipe used for MPO) +- Now, if the user moves the video in the middle of 2 displays, one part of the + video won't be MPO since we have used 3/3 pipes. + +* **Scaling limitation** + +MPO cannot handle scaling less than 0.25 and more than x16. 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b/Documentation/gpu/amdgpu/display/programming-model-dcn.rst @@ -0,0 +1,162 @@ +==================== +DC Programming Model +==================== + +In the :ref:`Display Core Next (DCN) <dcn_overview>` and :ref:`DCN Block +<dcn_blocks>` pages, you learned about the hardware components and how they +interact with each other. On this page, the focus is shifted to the display +code architecture. Hence, it is reasonable to remind the reader that the code +in DC is shared with other OSes; for this reason, DC provides a set of +abstractions and operations to connect different APIs with the hardware +configuration. See DC as a service available for a Display Manager (amdgpu_dm) +to access and configure DCN/DCE hardware (DCE is also part of DC, but for +simplicity's sake, this documentation only examines DCN). + +.. note:: + For this page, we will use the term GPU to refers to dGPU and APU. + +Overview +======== + +From the display hardware perspective, it is plausible to expect that if a +problem is well-defined, it will probably be implemented at the hardware level. +On the other hand, when there are multiple ways of achieving something without +a very well-defined scope, the solution is usually implemented as a policy at +the DC level. In other words, some policies are defined in the DC core +(resource management, power optimization, image quality, etc.), and the others +implemented in hardware are enabled via DC configuration. + +In terms of hardware management, DCN has multiple instances of the same block +(e.g., HUBP, DPP, MPC, etc), and during the driver execution, it might be +necessary to use some of these instances. The core has policies in place for +handling those instances. Regarding resource management, the DC objective is +quite simple: minimize the hardware shuffle when the driver performs some +actions. When the state changes from A to B, the transition is considered +easier to maneuver if the hardware resource is still used for the same set of +driver objects. Usually, adding and removing a resource to a `pipe_ctx` (more +details below) is not a problem; however, moving a resource from one `pipe_ctx` +to another should be avoided. + +Another area of influence for DC is power optimization, which has a myriad of +arrangement possibilities. In some way, just displaying an image via DCN should +be relatively straightforward; however, showing it with the best power +footprint is more desirable, but it has many associated challenges. +Unfortunately, there is no straight-forward analytic way to determine if a +configuration is the best one for the context due to the enormous variety of +variables related to this problem (e.g., many different DCN/DCE hardware +versions, different displays configurations, etc.) for this reason DC +implements a dedicated library for trying some configuration and verify if it +is possible to support it or not. This type of policy is extremely complex to +create and maintain, and amdgpu driver relies on Display Mode Library (DML) to +generate the best decisions. + +In summary, DC must deal with the complexity of handling multiple scenarios and +determine policies to manage them. All of the above information is conveyed to +give the reader some idea about the complexity of driving a display from the +driver's perspective. This page hopes to allow the reader to better navigate +over the amdgpu display code. + +Display Driver Architecture Overview +==================================== + +The diagram below provides an overview of the display driver architecture; +notice it illustrates the software layers adopted by DC: + +.. kernel-figure:: dc-components.svg + +The first layer of the diagram is the high-level DC API represented by the +`dc.h` file; below it are two big blocks represented by Core and Link. Next is +the hardware configuration block; the main file describing it is +the`hw_sequencer.h`, where the implementation of the callbacks can be found in +the hardware sequencer folder. Almost at the end, you can see the block level +API (`dc/inc/hw`), which represents each DCN low-level block, such as HUBP, +DPP, MPC, OPTC, etc. Notice on the left side of the diagram that we have a +different set of layers representing the interaction with the DMUB +microcontroller. + +Basic Objects +------------- + +The below diagram outlines the basic display objects. In particular, pay +attention to the names in the boxes since they represent a data structure in +the driver: + +.. kernel-figure:: dc-arch-overview.svg + +Let's start with the central block in the image, `dc`. The `dc` struct is +initialized per GPU; for example, one GPU has one `dc` instance, two GPUs have +two `dc` instances, and so forth. In other words we have one 'dc' per 'amdgpu' +instance. In some ways, this object behaves like the `Singleton` pattern. + +After the `dc` block in the diagram, you can see the `dc_link` component, which +is a low-level abstraction for the connector. One interesting aspect of the +image is that connectors are not part of the DCN block; they are defined by the +platform/board and not by the SoC. The `dc_link` struct is the high-level data +container with information such as connected sinks, connection status, signal +types, etc. After `dc_link`, there is the `dc_sink`, which is the object that +represents the connected display. + +.. note:: + For historical reasons, we used the name `dc_link`, which gives the + wrong impression that this abstraction only deals with physical connections + that the developer can easily manipulate. However, this also covers + connections like eDP or cases where the output is connected to other devices. + +There are two structs that are not represented in the diagram since they were +elaborated in the DCN overview page (check the DCN block diagram :ref:`Display +Core Next (DCN) <dcn_overview>`); still, it is worth bringing back for this +overview which is `dc_stream` and `dc_state`. The `dc_stream` stores many +properties associated with the data transmission, but most importantly, it +represents the data flow from the connector to the display. Next we have +`dc_state`, which represents the logic state within the hardware at the moment; +`dc_state` is composed of `dc_stream` and `dc_plane`. The `dc_stream` is the DC +version of `drm_crtc` and represents the post-blending pipeline. + +Speaking of the `dc_plane` data structure (first part of the diagram), you can +think about it as an abstraction similar to `drm_plane` that represents the +pre-blending portion of the pipeline. This image was probably processed by GFX +and is ready to be composited under a `dc_stream`. Normally, the driver may +have one or more `dc_plane` connected to the same `dc_stream`, which defines a +composition at the DC level. + +Basic Operations +---------------- + +Now that we have covered the basic objects, it is time to examine some of the +basic hardware/software operations. Let's start with the `dc_create()` +function, which directly works with the `dc` data struct; this function behaves +like a constructor responsible for the basic software initialization and +preparing for enabling other parts of the API. It is important to highlight +that this operation does not touch any hardware configuration; it is only a +software initialization. + +Next, we have the `dc_hardware_init()`, which also relies on the `dc` data +struct. Its main function is to put the hardware in a valid state. It is worth +highlighting that the hardware might initialize in an unknown state, and it is +a requirement to put it in a valid state; this function has multiple callbacks +for the hardware-specific initialization, whereas `dc_hardware_init` does the +hardware initialization and is the first point where we touch hardware. + +The `dc_get_link_at_index` is an operation that depends on the `dc_link` data +structure. This function retrieves and enumerates all the `dc_links` available +on the device; this is required since this information is not part of the SoC +definition but depends on the board configuration. As soon as the `dc_link` is +initialized, it is useful to figure out if any of them are already connected to +the display by using the `dc_link_detect()` function. After the driver figures +out if any display is connected to the device, the challenging phase starts: +configuring the monitor to show something. Nonetheless, dealing with the ideal +configuration is not a DC task since this is the Display Manager (`amdgpu_dm`) +responsibility which in turn is responsible for dealing with the atomic +commits. The only interface DC provides to the configuration phase is the +function `dc_validate_with_context` that receives the configuration information +and, based on that, validates whether the hardware can support it or not. It is +important to add that even if the display supports some specific configuration, +it does not mean the DCN hardware can support it. + +After the DM and DC agree upon the configuration, the stream configuration +phase starts. This task activates one or more `dc_stream` at this phase, and in +the best-case scenario, you might be able to turn the display on with a black +screen (it does not show anything yet since it does not have any plane +associated with it). The final step would be to call the +`dc_update_planes_and_stream,` which will add or remove planes. + diff --git a/Documentation/gpu/amdgpu/display/single-display-mpo-multi-video.svg b/Documentation/gpu/amdgpu/display/single-display-mpo-multi-video.svg new file mode 100644 index 000000000..fa807115c --- /dev/null +++ b/Documentation/gpu/amdgpu/display/single-display-mpo-multi-video.svg @@ -0,0 +1,339 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!-- Created with Inkscape (http://www.inkscape.org/) --> + +<svg + xmlns:dc="http://purl.org/dc/elements/1.1/" + xmlns:cc="http://creativecommons.org/ns#" + xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" + xmlns:svg="http://www.w3.org/2000/svg" + xmlns="http://www.w3.org/2000/svg" + xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" + xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" + width="112.16296mm" + height="93.314507mm" + viewBox="0 0 112.16296 93.314508" + version="1.1" + id="svg8" + 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