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| author | Keith Packard <keithp@keithp.com> | 2008-10-30 19:38:18 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-31 10:12:39 +0100 |
| commit | 9663f2e6a6cf3f82b06d8fb699b11b80f92553ba (patch) | |
| tree | 108ce4d443e87c8ddc00c028c995b83a6d01e420 /Documentation/keys.txt | |
| parent | fd9409343521eac22b6ed51686128a643c7c976b (diff) | |
| download | linux-9663f2e6a6cf3f82b06d8fb699b11b80f92553ba.tar.gz linux-9663f2e6a6cf3f82b06d8fb699b11b80f92553ba.tar.bz2 linux-9663f2e6a6cf3f82b06d8fb699b11b80f92553ba.zip | |
resources: add io-mapping functions to dynamically map large device apertures
Impact: add new generic io_map_*() APIs
Graphics devices have large PCI apertures which would consume a significant
fraction of a 32-bit address space if mapped during driver initialization.
Using ioremap at runtime is impractical as it is too slow.
This new set of interfaces uses atomic mappings on 32-bit processors and a
large static mapping on 64-bit processors to provide reasonable 32-bit
performance and optimal 64-bit performance.
The current implementation sits atop the io_map_atomic fixmap-based
mechanism for 32-bit processors.
This includes some editorial suggestions from Randy Dunlap for
Documentation/io-mapping.txt
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/keys.txt')
0 files changed, 0 insertions, 0 deletions