Task

Why?

Priority

Status

Responsible

Implement pmap_mapdev_attr() on FreeBSD/i386 and on FreeBSD/amd64.

Allows reliable creation of kernel mappings of I/O memory with specific cache attributes (with per-page granularity).

Needed for FreeBSD/amd64.

Complete

alc@

Design/implement better mmap(2) mechanism for mapping memory to user space (context information, cache attributes).

Allows reliable creation of user mappings of DMA and I/O memory and support for systems with more than 4GB of RAM.

PCI-E performance improvements, SLI support, FreeBSD/amd64 support.

Complete

jhb@

Allow VM objects to be mapped with non-default cache modes

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In progress

alc@ / jhb@

Add a new OBJT_SG VM object to map arbitrary address ranges

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In progress

jhb@

Allow mmap() to prefault mappings for OBJT_SG and possibly OBJT_DEVICE

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In progress

alc@ / jhb@

Implement pmap_change_attr() on FreeBSD/i386 and on FreeBSD/amd64.

Allows prevention of cache coherency problems.

Needed for FreeBSD/amd64.

Complete

alc@

Implement mechanism to allow character drivers to maintain per-open instance data (e.g. like the Linux kernel's 'struct file *').

Allows per thread NVIDIA notification delivery; also reduces CPU overhead for notification delivery from the NVIDIA kernel module to the X driver and to OpenGL. The FreeBSD kernel provides some support for this via cloning devices; the NVIDIA FreeBSD graphics driver used this interface for a while, but bugs/limitations and differences between kernel versions made it necessary to revert to regular device nodes.

Improved X/OpenGL performance.

Complete

kib@