CVS commit: [riastradh-drm2] src/sys/external/bsd/drm2

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

Module Name:    src
Committed By:   riastradh
Date:           Wed Jul 24 02:18:42 UTC 2013

Modified Files:
        src/sys/external/bsd/drm2/dist/include/drm [riastradh-drm2]: drmP.h
Added Files:
        src/sys/external/bsd/drm2/drm [riastradh-drm2]: drm_drv.c

Log Message:
First draft of NetBSD drm(4) driver attachment goop.

- Attachments will look like: drm0 at i915drm0 at pci0.  In the
future, we may have wsdisplay0 at (drmfb0 at) drm0 at pci0.  The
intent is to avoid having vga0, radeonfb0, &c., attach at pci0, and
then having drm0 parasitically sucking their memory as we currently
do with old drm.  The drm0 device exists only so that we can have a
unified /dev/drm device node exposed to userland (i.e., a single drm
device major).

- There are some OS-independent subroutines here that don't belong.
I wrote them by
  . studying the Linux driver attachment goop in dist/drm/drm_drv.c,
    drm_fops.c, and drm_stub.c;
  . identifying what logic is about DRM rather than about Linux's
    driver KPI; and
  . writing NetBSD driver attachment goop based on that information,
    with the logic that is about DRM and independent of driver KPI
    separated out into separate subroutines (drm_open_file, &c.).

- Initialization of struct drm_device is missing.  It's not clear yet
whether this should be done by i915drm_attach &c., perhaps using some
utility (say, drm_device_initialize) defined here, or whether this
should be done mostly by drm_attach.

- Poll and read are missing.  I suspect they will have to be filled
in at some point, in spite of comments in the old drm code to the
effect that they exist only for legacy X servers -- it looks like
more recent libdrms rely on them.

- Compile-tested only so far; this code is far from running.


To generate a diff of this commit:
cvs rdiff -u -r1.1.1.1.2.22 -r1.1.1.1.2.23 \
    src/sys/external/bsd/drm2/dist/include/drm/drmP.h
cvs rdiff -u -r0 -r1.1.2.1 src/sys/external/bsd/drm2/drm/drm_drv.c

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