This patchset introduces an approach to eliminate the direct calls to follow_page and to the low level cache APIs. The patchset works by caching the page information while memory is mapped, and then using that information later when needed instead of calling follow_page. The low level cache API is then replaced by standard DMA API. Changes from v1: * The DMM layer is enhanced to support caching of the required mapping and page information (inside dmm map objects). (the result: less code!) * Two new ioctls were added, PROC_BEGINDMA and PROC_ENDDMA. These ioctls accepts a general direction argument, so dspbridge now supports all three possible (FROM, TO & BIDI) DMA directions. * The old flush & inv ioctls were not removed; they have been implemented using the new DMA functions (with the appropriate direction). IOW, existing applications should still work as before. * mem_flush_cache is removed, since low-level cache operations are not needed anymore. * Patches were rebased on top of 7fd5c51c2753cedc095bfa20d433da1bb1e865a5. * Minor cleanups Notes: 1. The global bridge device struct is used by adding an 'extern' to proc. This issue should be handled in a different patch series (the struct should not be global. instead, it should be accessible to the dspbridge code via one of the context objects. This way we will also be able to transform pr_* prints to dev_* prints). 2. The patchset was tested with the bridge testsuite and the dmm sample application running on ZOOM2 / 2.6.33. Many thanks to Felipe Contreras for the thorough review, comments and testing, and for Ivan Gomez Castellanos for thorough testing of multiple scenarios. Thanks, Ohad. --- If you want, you can also reach me at < ohadb at ti dot com >. Ohad Ben-Cohen (7): DSPBRIDGE: enhance dmm_map_object DSPBRIDGE: maintain mapping and page info DSPBRIDGE: do not call follow_page DSPBRIDGE: do not use low level cache manipulation API DSPBRIDGE: remove mem_flush_cache DSPBRIDGE: add dspbridge API to mark end of DMA DSPBRIDGE: add new PROC_BEGINDMA and PROC_ENDDMA ioctls arch/arm/plat-omap/include/dspbridge/drv.h | 32 +- .../arm/plat-omap/include/dspbridge/dspapi-ioctl.h | 9 + arch/arm/plat-omap/include/dspbridge/dspapi.h | 2 + arch/arm/plat-omap/include/dspbridge/dspdefs.h | 3 +- arch/arm/plat-omap/include/dspbridge/proc.h | 29 ++ drivers/dsp/bridge/core/io_sm.c | 11 +- drivers/dsp/bridge/core/tiomap3430.c | 9 +- drivers/dsp/bridge/pmgr/dspapi.c | 34 ++- drivers/dsp/bridge/rmgr/drv.c | 33 -- drivers/dsp/bridge/rmgr/proc.c | 404 ++++++++++++++++---- 10 files changed, 427 insertions(+), 139 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
