On 23/02/2026 20:08, Ekansh Gupta wrote:

Introduce a built-in compute context-bank (CB) bus used by the Qualcomm DSP accelerator (QDA) driver to represent DSP CB devices that require IOMMU configuration. This separates the CB bus from the QDA driver and allows QDA to remain a loadable module while the bus is always built-in.

A new bool Kconfig symbol DRM_ACCEL_QDA_COMPUTE_BUS is added and is selected by the main DRM_ACCEL_QDA driver. The parent accel Makefile is updated to descend into the QDA directory for both built-in and module builds so that the CB bus is compiled into vmlinux while the driver remains modular.

The CB bus is registered at postcore_initcall() time and is exposed to the IOMMU core through iommu_buses[] in the same way as the Tegra host1x context-bus. This enables later patches to create CB devices on this bus and obtain IOMMU domains for them.

Signed-off-by: Ekansh Gupta ekansh.gupta@oss.qualcomm.com

drivers/accel/Makefile | 1 + drivers/accel/qda/Kconfig | 5 +++++ drivers/accel/qda/Makefile | 2 ++ drivers/accel/qda/qda_compute_bus.c | 23 +++++++++++++++++++++++ drivers/iommu/iommu.c | 4 ++++ include/linux/qda_compute_bus.h | 22 ++++++++++++++++++++++

Do not combine independent work into one patch.

Also, your patch has clear patch warnings, so please review it BEFORE you send.

Best regards, Krzysztof