Am 25.03.25 um 18:18 schrieb Rodrigo Siqueira: > Pipes and Queues are two common vocabulary that pervades discussions > around amdgpu core features. The definition and explanation of those > components are spread around multiple places in the code, mailing list, > and Gitlab, which sometimes leads to the wrong interpretation of these > concepts. This commit attempts to centralize the definition and > explanation of Pipe and Queue from amdgpu perspective in a kernel doc. > Most of the information in this doc was derived from: > > - > https://lore.kernel.org/amd-gfx/CADnq5_Pcz2x4aJzKbVrN3jsZhD6sTydtDw=6pan4o3m4t+g...@mail.gmail.com/T/#m9a670b55ab20e0f7c46c80f802a0a4be255a719d > - https://gitlab.freedesktop.org/mesa/mesa/-/issues/11759 > > Signed-off-by: Rodrigo Siqueira <sique...@igalia.com>
Oh that's really nice to have, especially since I'm constantly mixing up the terms queue and pipe as well :) Reviewed-by: Christian König <christian.koe...@amd.com> > --- > Documentation/gpu/amdgpu/driver-core.rst | 49 + > .../gpu/amdgpu/pipe_and_queue_abstraction.svg | 1279 +++++++++++++++++ > 2 files changed, 1328 insertions(+) > create mode 100644 Documentation/gpu/amdgpu/pipe_and_queue_abstraction.svg > > diff --git a/Documentation/gpu/amdgpu/driver-core.rst > b/Documentation/gpu/amdgpu/driver-core.rst > index 32723a925377..746fd081876f 100644 > --- a/Documentation/gpu/amdgpu/driver-core.rst > +++ b/Documentation/gpu/amdgpu/driver-core.rst > @@ -98,6 +98,55 @@ RLC (RunList Controller) > The name is a vestige of old hardware where it was originally added > and doesn't really have much relation to what the engine does now. > > + > +GFX, Compute, and SDMA Overall Behavior > +======================================= > + > +.. note:: For simplicity, whenever the term block is used in this section, it > + means GFX, Compute, and SDMA. > + > +GFX, Compute and SDMA share a similar form of operation that can be > abstracted > +to facilitate understanding of the behavior of these blocks. See the figure > +below illustrating the common components of these blocks: > + > +.. kernel-figure:: pipe_and_queue_abstraction.svg > + > +In the central part of this figure, you can see two elements, one called > +**Pipe** and another named **Queues**; it is important to highlight that > Queues > +must be associated with a Pipe and vice-versa. Every specific hardware may > have > +a different number of Pipes and, in turn, a different number of Queues; for > +example, GFX 11 has two Pipes and two Queues per Pipe. > + > +Pipe is the hardware that processes the instructions available in the Queues; > +in other words, it is a thread executing the operations inserted in the > Queue. > +One crucial characteristic of Pipes is that they can only execute one Queue > at > +a time; no matter if the hardware has multiple Queues in the Pipe, it only > runs > +one Queue per Pipe. When a queue is running in the Pipe, it is said that the > +Queue is **Active**. > + > +Pipes have the mechanics of swapping between queues at the hardware level. > +Nonetheless, they only make use of Queues that are considered mapped. Pipes > can > +switch between queues based on any of the following inputs: > + > +1. Command Stream; > +2. Packet by Packet; > +3. Other hardware requests the change (e.g., MES). > + > +Queues within Pipes are defined by the Hardware Queue Descriptors (HQD). > +Associated with the HQD concept, we have the Memory Queue Descriptor (MQD), > +which is responsible for storing information about the state of each of the > +available Queues in the memory. The state of a Queue contains information > such > +as the GPU virtual address of the queue itself, save areas, doorbell, etc. > The > +MQD also stores the HQD registers, which are vital for activating or > +deactivating a given Queue. > + > +The Queue-switching process can also happen with the firmware requesting the > +preemption or unmapping of a Queue. The firmware waits for the HQD_ACTIVE bit > +to change to low before saving the state into the MQD. To make a different > +Queue become active, the firmware copies the MQD state into the HQD registers > +and loads any additional state. Finally, it sets the HQD_ACTIVE bit to high > to > +indicate that the queue is active. > + > Driver Structure > ================ > > diff --git a/Documentation/gpu/amdgpu/pipe_and_queue_abstraction.svg > b/Documentation/gpu/amdgpu/pipe_and_queue_abstraction.svg > new file mode 100644 > index 000000000000..0df3c6b3000b > --- /dev/null > +++ b/Documentation/gpu/amdgpu/pipe_and_queue_abstraction.svg > @@ -0,0 +1,1279 @@ > +<?xml version="1.0" encoding="UTF-8" standalone="no"?> > +<!-- Created with Inkscape (http://www.inkscape.org/) --> > + > +<svg > + width="395.47891mm" > + height="234.73715mm" > + viewBox="0 0 395.47891 234.73714" > + version="1.1" > + id="svg1" > + inkscape:version="1.4 (e7c3feb100, 2024-10-09)" > + sodipodi:docname="pipe_and_queue_abstraction.svg" > + xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"; > + xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"; > + xmlns="http://www.w3.org/2000/svg"; > + xmlns:svg="http://www.w3.org/2000/svg";> 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style="font-style:normal;font-weight:normal;font-size:7.05556px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0690111" > + x="-18.502264" > + y="65.642387" > + id="text82"><tspan > + sodipodi:role="line" > + x="-18.502264" > + y="65.642387" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:7.05556px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > > Bold';text-align:center;text-anchor:middle;fill:#800000;stroke-width:0.0690111" > + id="tspan82">HQD</tspan></text> > + <ellipse > + > style="fill:#800000;fill-opacity:0;stroke:#800000;stroke-width:1;stroke-dasharray:none;stroke-dashoffset:0" > + id="ellipse82" > + cx="-18.407015" > + cy="63.2188" > + rx="13.317666" > + ry="4.4124799" /> > + <path > + > style="fill:#800000;fill-opacity:0;stroke:#800000;stroke-width:1;stroke-dasharray:none;stroke-dashoffset:0;marker-end:url(#Triangle)" > + d="M 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/> > + <path > + > style="fill:#800000;fill-opacity:0;stroke:#800000;stroke-width:1;stroke-dasharray:none;stroke-dashoffset:0;marker-end:url(#Triangle)" > + d="M -4.6361224,63.2188 H 10.606988" > + id="path83" /> > + </g> > + <g > + id="g85" > + transform="translate(0,85.195881)"> > + <text > + xml:space="preserve" > + > style="font-style:normal;font-weight:normal;font-size:7.05556px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0690111" > + x="-18.502264" > + y="65.642387" > + id="text84"><tspan > + sodipodi:role="line" > + x="-18.502264" > + y="65.642387" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:7.05556px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > > Bold';text-align:center;text-anchor:middle;fill:#800000;stroke-width:0.0690111" > + id="tspan84">HQD</tspan></text> > + <ellipse > + > style="fill:#800000;fill-opacity:0;stroke:#800000;stroke-width:1;stroke-dasharray:none;stroke-dashoffset:0" > + id="ellipse84" > + cx="-18.407015" > + cy="63.2188" > + rx="13.317666" > + ry="4.4124799" /> > + <path > + > style="fill:#800000;fill-opacity:0;stroke:#800000;stroke-width:1;stroke-dasharray:none;stroke-dashoffset:0;marker-end:url(#Triangle)" > + d="M -4.6361224,63.2188 H 10.606988" > + id="path84" /> > + </g> > + <g > + id="g86" > + transform="translate(0,99.48339)"> > + <text > + xml:space="preserve" > + > style="font-style:normal;font-weight:normal;font-size:7.05556px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0690111" > + x="-18.502264" > + y="65.642387" > + id="text85"><tspan > + sodipodi:role="line" > + x="-18.502264" > + y="65.642387" > + > 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y="82.441582" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:7.05556px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:center;text-anchor:middle;stroke-width:0.0690111" > + id="tspan87">MQD</tspan></text> > + <text > + xml:space="preserve" > + > style="font-style:normal;font-weight:normal;font-size:7.05556px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0690111" > + x="-74.441521" > + y="99.240776" > + id="text88"><tspan > + sodipodi:role="line" > + x="-74.441521" > + y="99.240776" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:7.05556px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:center;text-anchor:middle;stroke-width:0.0690111" > + id="tspan88">MQD</tspan></text> > + <text > + xml:space="preserve" > + > style="font-style:normal;font-weight:normal;font-size:7.05556px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0690111" > + x="-74.441521" > + y="116.03998" > + id="text89"><tspan > + sodipodi:role="line" > + x="-74.441521" > + y="116.03998" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:7.05556px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:center;text-anchor:middle;stroke-width:0.0690111" > + id="tspan89">MQD</tspan></text> > + <text > + xml:space="preserve" > + > style="font-style:normal;font-weight:normal;font-size:7.05556px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0690111" > + x="-74.441521" > + y="132.83917" > + id="text90"><tspan > + sodipodi:role="line" > + x="-74.441521" > + y="132.83917" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:7.05556px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:center;text-anchor:middle;stroke-width:0.0690111" > + id="tspan90">MQD</tspan></text> > + <text > + xml:space="preserve" > + > style="font-style:normal;font-weight:normal;font-size:7.05556px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0690111" > + x="-74.441521" > + y="168.3002" > + id="text91"><tspan > + sodipodi:role="line" > + x="-74.441521" > + y="168.3002" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:7.05556px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:center;text-anchor:middle;stroke-width:0.0690111" > + id="tspan91">MQD</tspan></text> > + <text > + xml:space="preserve" > + > style="font-style:normal;font-weight:normal;font-size:10.5833px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0690111" > + x="-74.441521" > + y="148.1461" > + id="text92"><tspan > + sodipodi:role="line" > + x="-74.441521" > + y="148.1461" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:10.5833px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > > Bold';text-align:center;writing-mode:tb-rl;text-anchor:middle;stroke-width:0.0690111" > + id="tspan92">...</tspan></text> > + <g > + id="g97" > + transform="translate(-5.8208336)"> > + <rect > + > style="fill:#aaffcc;fill-opacity:1;stroke:#1a1a1a;stroke-width:0.5;stroke-dasharray:none;stroke-dashoffset:0" > + id="rect96" > + width="58.726093" > + height="27.598055" > + x="-142.96434" > + y="46.852512" /> > + <text > + xml:space="preserve" > + > style="font-style:normal;font-weight:normal;font-size:4.23333px;line-height:1.25;font-family:sans-serif;text-align:start;letter-spacing:0px;word-spacing:0px;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0690111" > + x="-139.74622" > + y="52.62756" > + id="text93"><tspan > + sodipodi:role="line" > + x="-139.74622" > + y="52.62756" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.23333px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:start;text-anchor:start;stroke-width:0.0690111" > + id="tspan93">HQD Registers</tspan><tspan > + sodipodi:role="line" > + x="-139.74622" > + y="57.91922" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.23333px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:start;text-anchor:start;stroke-width:0.0690111" > + id="tspan95">Queue Address in the GPU</tspan><tspan > + sodipodi:role="line" > + x="-139.74622" > + y="63.210884" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.23333px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:start;text-anchor:start;stroke-width:0.0690111" > + id="tspan96">Doorbell</tspan><tspan > + sodipodi:role="line" > + x="-139.74622" > + y="68.502548" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.23333px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:start;text-anchor:start;stroke-width:0.0690111" > + id="tspan97">...</tspan><tspan > + sodipodi:role="line" > + x="-139.74622" > + y="73.794212" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.23333px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:start;text-anchor:start;stroke-width:0.0690111" > + id="tspan94" /></text> > + </g> > + <text > + xml:space="preserve" > + > style="font-style:normal;font-weight:normal;font-size:4.23333px;line-height:1.25;font-family:sans-serif;text-align:start;letter-spacing:0px;word-spacing:0px;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0690111" > + x="-61.293022" > + y="-19.380915" > + id="text93-1"><tspan > + sodipodi:role="line" > + x="-61.293022" > + y="-19.380915" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.23333px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:center;text-anchor:middle;stroke-width:0.0690111" > + id="tspan104">SWITCH QUEUE:</tspan><tspan > + sodipodi:role="line" > + x="-61.293022" > + y="-14.089252" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.23333px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:start;text-anchor:start;stroke-width:0.0690111" > + id="tspan101">WAIT FOR HQD_ACTIVE = 0</tspan><tspan > + sodipodi:role="line" > + x="-61.293022" > + y="-8.7975903" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.23333px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:start;text-anchor:start;stroke-width:0.0690111" > + id="tspan105">SAVE QUEUE STATE TO THE MQD</tspan><tspan > + sodipodi:role="line" > + x="-61.293022" > + y="-3.505928" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.23333px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:start;text-anchor:start;stroke-width:0.0690111" > + id="tspan102">COPY NEW MQD STATE</tspan><tspan > + sodipodi:role="line" > + x="-61.293022" > + y="1.7857342" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.23333px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:start;text-anchor:start;stroke-width:0.0690111" > + id="tspan103">SET HQD_ACTIVE = 1</tspan></text> > + <circle > + > style="fill:#ffeeaa;fill-opacity:1;stroke:#1a1a1a;stroke-width:1.88976;stroke-dasharray:none;stroke-dashoffset:0" > + id="path97" > + cx="0" > + cy="0" > + r="0" > + transform="matrix(0.26458333,0,0,0.26458333,-149.03517,37.347779)" /> > + <text > + xml:space="preserve" > + > style="font-style:normal;font-weight:normal;font-size:5.64444px;line-height:1.25;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.0690111" > + x="-36.659206" > + y="-44.828983" > + id="text106"><tspan > + sodipodi:role="line" > + x="-36.659206" > + y="-44.828983" > + > style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:5.64444px;font-family:sans-serif;-inkscape-font-specification:'sans-serif > Bold';text-align:center;text-anchor:middle;stroke-width:0.0690111" > + id="tspan106">Firmware</tspan></text> > + <path > + > style="fill:none;fill-opacity:1;stroke:#1a1a1a;stroke-width:1;stroke-dasharray:none;stroke-dashoffset:0;marker-start:url(#marker109);marker-end:url(#ArrowTriangleStylized)" > + d="M -84.242601,-9.1838245 H -98.041629 V 33.17598" > + id="path106" /> > + <path > + > style="fill:none;fill-opacity:1;stroke:#1a1a1a;stroke-width:1;stroke-dasharray:none;stroke-dashoffset:0;marker-end:url(#Dot)" > + d="M 9.9745536,-9.3442784 H 29.549918 V 37.170287" > + id="path107" > + sodipodi:nodetypes="ccc" /> > + </g> > +</svg>
