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charset="utf-8" devinit is mentioned in the code. This patch explains it so it is clear what it does. devinit is not only essential at boot-time, but also at runtime due to suspend-resume and things like re-clocking. Signed-off-by: Joel Fernandes --- Documentation/gpu/nova/core/devinit.rst | 59 +++++++++++++++++++++++++ Documentation/gpu/nova/index.rst | 1 + drivers/gpu/nova-core/devinit.rs | 6 +-- 3 files changed, 63 insertions(+), 3 deletions(-) create mode 100644 Documentation/gpu/nova/core/devinit.rst diff --git a/Documentation/gpu/nova/core/devinit.rst b/Documentation/gpu/no= va/core/devinit.rst new file mode 100644 index 000000000000..85e7033dd3a7 --- /dev/null +++ b/Documentation/gpu/nova/core/devinit.rst @@ -0,0 +1,59 @@ +.. SPDX-License-Identifier: GPL-2.0 +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +Device Initialization (devinit) +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +Note that devinit itself is a complicated process, subject to change, and = this document +only roughly provides an overview of the process using the Ampere GPU fami= ly as an example. +The idea is to provide a conceptual overview of the process to help unders= tand the kernel +code that deals with it. + +Device initialization (devinit) is a crucial sequence of register read/wri= te operations=20 +that occur after a GPU reset. The devinit sequence is essential for proper= ly configuring=20 +the GPU hardware before it can be used. + +The devinit engine is an interpreter program that typically runs on the PM= U (Power Management +Unit) microcontroller of the GPU. This interpreter executes a "script" of = initialization +commands. The devinit engine itself is part of the VBIOS ROM in the same R= OM image as the +FWSEC (Firmware Security) image (see fwsec.rst and vbios.rst) and it runs = before the +nova-core driver is even loaded. On an Ampere GPU, the devinit ucode (whic= h is separate +from the FWSEC ucode), is launched by the FWSEC (FWSEC runs on GSP in heav= y-secure mode +and devinit runs on PMU in light-secure mode). + +Key Functions of devinit +------------------------ +devinit performs several critical tasks: + +1. Programming VRAM memory controller timings +2. Power sequencing +3. Clock and PLL (Phase-Locked Loop) configuration +4. Thermal management + +Low-level Firmware Initialization Flow +-------------------------------------- +Upon reset, several microcontrollers on the GPU (such as PMU, SEC2, GSP, e= tc.) run GPU=20 +firmware (gfw) code to set up the GPU and its core parameters. Most of the= GPU is +considered unusable until this initialization process completes. + +These low-level GPU firmware components are typically: +1. Located in the VBIOS ROM in the same ROM partition (see vbios.rst and f= wsec.rst). +2. Executed in sequence on different microcontrollers: + - The devinit engine typically but not necessarily runs on the PMU. + - On an Ampere GPU, the FWSEC typically runs on the GSP (GPU System Pro= cessor) in + heavy-secure mode. + +Before the driver can proceed with further initialization, it must wait fo= r a signal=20 +indicating that core initialization is complete (known as GFW_BOOT). This = signal is +asserted by the FWSEC running on the GSP in heavy-secure mode. + +Runtime Considerations +--------------------- +It's important to note that the devinit sequence also needs to run during = suspend/resume=20 +operations at runtime, not just during initial boot, as it is critical to = power management. + +Security and Access Control +-------------------------- +The initialization process involves careful privilege management. For exam= ple, before=20 +accessing certain completion status registers, the driver must check privi= lege level=20 +masks. Some registers are only accessible after secure firmware (FWSEC) lo= wers the=20 +privilege level to allow CPU (LS/low-secure) access. For example, to recei= ve the +GFW_BOOT signal. \ No newline at end of file diff --git a/Documentation/gpu/nova/index.rst b/Documentation/gpu/nova/inde= x.rst index 22e5712ac6b0..301435c5cf67 100644 --- a/Documentation/gpu/nova/index.rst +++ b/Documentation/gpu/nova/index.rst @@ -29,4 +29,5 @@ vGPU manager VFIO driver and the nova-drm driver. core/guidelines core/vbios core/fwsec + core/devinit core/todo diff --git a/drivers/gpu/nova-core/devinit.rs b/drivers/gpu/nova-core/devin= it.rs index 21fc9b96d498..bd6a5c57c444 100644 --- a/drivers/gpu/nova-core/devinit.rs +++ b/drivers/gpu/nova-core/devinit.rs @@ -10,8 +10,8 @@ //! 3. Clock and PLL configuration. //! 4. Thermal management. //! -//! devinit itself is a 'script' which is interpreted by the PMU microcont= roller of -//! the GPU by an interpreter program. +//! devinit itself is a 'script' which is interpreted by a microcontroller= of +//! the GPU by an interpreter program (typically running on the PMU). //! //! Note that the devinit sequence also needs to run during suspend/resume= at runtime. =20 @@ -30,7 +30,7 @@ /// /// The GPU firmware (gfw) code includes several components that execute b= efore the driver loads. /// These components are located in the VBIOS ROM and are executed in a se= quence on these different -/// microcontrollers. The devinit sequence itself runs on the PMU, and the= FWSEC runs on the GSP. +/// microcontrollers. The devinit sequence typically runs on the PMU, and = the FWSEC runs on the GSP. /// /// This function specifically waits for a signal indicating core initiali= zation is complete before /// which not much can be done. This signal is setup by the FWSEC running = on the GSP in Heavy-secured --=20 2.43.0