CVS commit: src/sys/external/bsd/drm2

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Mon Aug 27 15:26:50 UTC 2018

Modified Files:
        src/sys/external/bsd/drm2/dist/drm: drm_prime.c
        src/sys/external/bsd/drm2/dist/include/drm: drmP.h
        src/sys/external/bsd/drm2/drm: drm_gem_cma_helper.c
        src/sys/external/bsd/drm2/include/drm: bus_dma_hacks.h

Log Message:
Rework drm prime guts.

- Our faux struct sg_table is now just an array of _pages_, not of
  bus dma segments.

- We handle bus dma segments only in the presence of an adult bus dma
  tag.

- All bus dma hacks are once again confined to bus_dma_hacks.h, and
  more neatly organized:
  . bus_dmamem_export_pages translates bus dma segs to vm_page array
  . bus_dmamem_import_pages translates vm_page array to bus dma segs


To generate a diff of this commit:
cvs rdiff -u -r1.4 -r1.5 src/sys/external/bsd/drm2/dist/drm/drm_prime.c
cvs rdiff -u -r1.28 -r1.29 src/sys/external/bsd/drm2/dist/include/drm/drmP.h
cvs rdiff -u -r1.3 -r1.4 src/sys/external/bsd/drm2/drm/drm_gem_cma_helper.c
cvs rdiff -u -r1.11 -r1.12 \
    src/sys/external/bsd/drm2/include/drm/bus_dma_hacks.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.