On Tue, Feb 24, 2026 at 12:39:00AM +0530, Ekansh Gupta wrote: > Introduce a per-device memory manager for the QDA driver that tracks > IOMMU-capable compute context-bank (CB) devices. Each CB device is > represented by a qda_iommu_device and registered with a central > qda_memory_manager instance owned by qda_dev. > > The memory manager maintains an xarray of devices and assigns a > unique ID to each CB. It also provides basic lifetime management
Sounds like IDR. > and a workqueue for deferred device removal. qda_cb_setup_device() What is deferred device removal? Why do you need it? > now allocates a qda_iommu_device for each CB and registers it with > the memory manager after DMA configuration succeeds. > > qda_init_device() is extended to allocate and initialize the memory > manager, while qda_deinit_device() will tear it down in later > patches. This prepares the QDA driver for fine-grained memory and > IOMMU domain management tied to individual CB devices. > > Signed-off-by: Ekansh Gupta <[email protected]> > --- > drivers/accel/qda/Makefile | 1 + > drivers/accel/qda/qda_cb.c | 32 +++++++ > drivers/accel/qda/qda_drv.c | 46 ++++++++++ > drivers/accel/qda/qda_drv.h | 3 + > drivers/accel/qda/qda_memory_manager.c | 152 > +++++++++++++++++++++++++++++++++ > drivers/accel/qda/qda_memory_manager.h | 101 ++++++++++++++++++++++ > 6 files changed, 335 insertions(+) > -- With best wishes Dmitry
