From cf9610f9116d55c5a66ef9f1faecacabd93a9322 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Mon, 24 Aug 2026 08:46:03 -0700 Subject: Merge tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl Pull pin control updates from Linus Walleij: "Core changes: - Use the non-blocking mux_state_try_select() in the generic MUX pin control back-end - Free pin maps on pinctrl_generic_to_map() failure in the core helpers New hardware pin control: - Qualcomm Maili TLMM SoC, PMG1110 PMIC, and Eliza LPASS LPI TLMM SoC (this is for the low power audio, LPASS = Low Power Audio SubSystem portions) - Upboard support on top of the Intel pin controller - Apple T6030 and T6031 support (just compatible strings) - Samsung Exynos 8855 SoC - Mediatek MT6858 SoC - Rockchip RK3308B and RV1106 SoCs - Airoha EN7523 and AN7563 SoCs Improvements: - Qualcomm TLMM GPIOs are unconditionally marked as wakeup capable - Qualcomm improvements on top of the Qualcomm PDC (power domain controller) irqchip improvements from tglx:s tree - Qualcomm IPQ806x and IPQ9650 non-urgent pin grop fixups - The NPCM8xx driver has been put into shape fixing many pin and group definitions - Some non-urgent Tegra 264 pin assignments are fixed up - Some non-urgent fixups to Airoha AN7581 and AN7583 registers and pin assignments, missing features etc" * tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (130 commits) dt-bindings: pinctrl: Convert TI DA850 pupd to DT schema pinctrl: meson: sync some modify from A4 pinctrl: meson: a4: Add input enable pin configuration pinctrl: realtek: rtd1625: remove unused group name spdif_sel pinctrl: realtek: rtd1625: fix base_bit for VE4 GPIO 13 dt-bindings: pinctrl: microchip,pic32mzda-pinctrl: Convert to DT schema Revert "Merge branch 'ib-rsk7204' into devel" pinctrl: rockchip: Add RV1106 pinctrl support dt-bindings: pinctrl: rockchip: Add RV1106 compatible pinctrl: rockchip: Decode drive strength in the get function pinctrl: fix PINCTRL_GENERIC_MUX not always being selectable pinctrl: airoha: add support of an7563 SoC dt-bindings: pinctrl: airoha: add support of an7563 pin controller pinctrl: airoha: try to find chip scu node by phandle first pinctrl: airoha: add support of en7523 SoC dt-bindings: pinctrl: airoha: add support of en7523 pin controller pinctrl: airoha: an7583: add support for olt pinmux pinctrl: airoha: an7583: add support for pon_alt pinmux pinctrl: airoha: an7583: add support for npu_uart pinmux dt-bindings: pinctrl: airoha: an7583: add missed features ... --- Documentation/gpu/amdgpu/gc/index.rst | 54 +++++++++++++++++++++++++++++++++++ Documentation/gpu/amdgpu/gc/mes.rst | 38 ++++++++++++++++++++++++ 2 files changed, 92 insertions(+) create mode 100644 Documentation/gpu/amdgpu/gc/index.rst create mode 100644 Documentation/gpu/amdgpu/gc/mes.rst (limited to 'Documentation/gpu/amdgpu/gc') diff --git a/Documentation/gpu/amdgpu/gc/index.rst b/Documentation/gpu/amdgpu/gc/index.rst new file mode 100644 index 000000000..b6b583c9d --- /dev/null +++ b/Documentation/gpu/amdgpu/gc/index.rst @@ -0,0 +1,54 @@ +.. _amdgpu-gc: + +======================================== + drm/amdgpu - Graphics and Compute (GC) +======================================== + +The relationship between the CPU and GPU can be described as the +producer-consumer problem, where the CPU fills out a buffer with operations +(producer) to be executed by the GPU (consumer). The requested operations in +the buffer are called **Command Packets**, which can be summarized as a +compressed way of transmitting command information to the graphics controller. + +The component that acts as the front end between the CPU and the GPU is called +**Command Processor (CP)**. This component is responsible for providing greater +flexibility to the **Graphics and Compute (GC)** since CP makes it possible to +program various aspects of the GPU pipeline. CP also coordinates the +communication between the CPU and GPU via a mechanism named **Ring Buffers**, +where the CPU appends information to the buffer while the GPU removes +operations. CP is also responsible for handling **Indirect Buffers (IB)**. + +For reference, internally the CP consists of several sub-blocks (CPC - CP +compute, CPG - CP graphics, and CPF - CP fetcher). Some of these acronyms +appear in register names, but this is more of an implementation detail and not +something that directly impacts driver programming or debugging. + +Graphics (GFX) and Compute Microcontrollers +------------------------------------------- + +GC is a large block, and as a result, it has multiple firmware associated with +it. Some of them are: + +CP (Command Processor) + The name for the hardware block that encompasses the front end of the + GFX/Compute pipeline. Consists mainly of a bunch of microcontrollers + (PFP, ME, CE, MEC). The firmware that runs on these microcontrollers + provides the driver interface to interact with the GFX/Compute engine. + + MEC (MicroEngine Compute) + This is the microcontroller that controls the compute queues on the + GFX/compute engine. + + MES (MicroEngine Scheduler) + This is the engine for managing queues. For more details check + :ref:`MicroEngine Scheduler (MES) `. + +RLC (RunList Controller) + This is another microcontroller in the GFX/Compute engine. It handles + power management related functionality within the GFX/Compute engine. + 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. + +.. toctree:: + + mes.rst diff --git a/Documentation/gpu/amdgpu/gc/mes.rst b/Documentation/gpu/amdgpu/gc/mes.rst new file mode 100644 index 000000000..b99eb211b --- /dev/null +++ b/Documentation/gpu/amdgpu/gc/mes.rst @@ -0,0 +1,38 @@ +.. _amdgpu-mes: + +============================= + MicroEngine Scheduler (MES) +============================= + +.. note:: + Queue and ring buffer are used as a synonymous. + +.. note:: + This section assumes that you are familiar with the concept of Pipes, Queues, and GC. + If not, check :ref:`GFX, Compute, and SDMA Overall Behavior` + and :ref:`drm/amdgpu - Graphics and Compute (GC) `. + +Every GFX has a pipe component with one or more hardware queues. Pipes can +switch between queues depending on certain conditions, and one of the +components that can request a queue switch to a pipe is the MicroEngine +Scheduler (MES). Whenever the driver is initialized, it creates one MQD per +hardware queue, and then the MQDs are handed to the MES firmware for mapping +to: + +1. Kernel Queues (legacy): This queue is statically mapped to HQDs and never + preempted. Even though this is a legacy feature, it is the current default, and + most existing hardware supports it. When an application submits work to the + kernel driver, it submits all of the application command buffers to the kernel + queues. The CS IOCTL takes the command buffer from the applications and + schedules them on the kernel queue. + +2. User Queues: These queues are dynamically mapped to the HQDs. Regarding the + utilization of User Queues, the userspace application will create its user + queues and submit work directly to its user queues with no need to IOCTL for + each submission and no need to share a single kernel queue. + +In terms of User Queues, MES can dynamically map them to the HQD. If there are +more MQDs than HQDs, the MES firmware will preempt other user queues to make +sure each queues get a time slice; in other words, MES is a microcontroller +that handles the mapping and unmapping of MQDs into HQDs, as well as the +priorities and oversubscription of MQDs. -- cgit v1.3.1