disk IO directly from PCI memory to block device sectors
From: marty
Date: Fri Sep 26 2008 - 03:29:18 EST
We have a large ram area on a PCI board (think of a custom framebuffer
type application). We're using 2.6.20.
We have the PCI ram mapped into kernel space, and knew the physical addresses.
We have a raw partition on the block device which we reserve for this.
We want to be able to stick the contents of selected portion of PCI ram onto a block device (disk). Past incarnations modified the disk driver, and developed a special API so the custom driver constructed scatter/gather lists and fed it to the driver (bypassing the elevator algorithm, to execute
as the "next request".
What I'm looking is for a more generic/driver independent way of sticking
contents of PCI ram onto a disk.
Is offset + length of each bio_vec < pagesize?
What's the best way to do this (much of my data is already in physically
contiguous memory [and mapped into virtual memory)).
Any good examples to look at?
marty
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