Thanks, Eric. You have seconds. I'll contact you offline to get you set up.
On Wed, 13 Sep 2006, Eric Lowe wrote:
I propose a virtual memory project, DMA Memory Infrastructure (DMI for short). This project will provide infrastructure to: - Allocate physical memory in contiguous [1], large page [1], or small page-size chunks within device address constraints - Lock and unlock the allocated memory pages and return bus addresses as a scatter/gather list - Create kmem caches for frequently constructed DMA objects - Reduce external fragmentation on x86/x64 platform for more efficient scatter/gather DMA - Optionally map the memory into process address spaces and unmap it when required - Optionally map the memory into kernel address space and callback to device drivers to unmap it when required - Optionally reserve physical memory at boot for contiguous device allocation (useful for devices like shared memory frame buffers) - Control processor cache attributes for all established mappings This project does NOT provide leaf driver interfaces -- that is out of scope -- it only provides the core kernel infrastructure required for developing new high-performance DDI DMA interfaces with improved RAS. However the interfaces should also be usable by existing driver _frameworks_ such as GLD, SCSA, and SATA. Initial leads will be myself and Mike Corcoran. - Eric [1] When physical memory is not fragmented.
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