diff options
| author | Keith Packard <[email protected]> | 2008-10-30 19:38:18 -0700 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2008-10-31 10:12:39 +0100 |
| commit | 9663f2e6a6cf3f82b06d8fb699b11b80f92553ba (patch) | |
| tree | 108ce4d443e87c8ddc00c028c995b83a6d01e420 /fs/jbd2/commit.c | |
| parent | fd9409343521eac22b6ed51686128a643c7c976b (diff) | |
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 <[email protected]>
Signed-off-by: Eric Anholt <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'fs/jbd2/commit.c')
0 files changed, 0 insertions, 0 deletions