drm: Avoid null pointer deref for drivers with atomic modeset.

drm: Work around client modeset mutex for entering ddb.

Linux introduced a wait lock (`mutex') around access to the drm
client modesets, even for drm_fb_helper_debug_enter/leave -- which
happen when we're crashing and can't wait for the scheduler to let
whatever thread might hold a mutex continue to run.

This really shouldn't be a wait lock, but disentangling the lock
order and sleeping allocations is difficult, so let's just hope that
it's safe to access unlocked in ddb for now.

Narrow scope of exclusions in drm_fb_helper.c; reduce diffs.

Restore drm_fb_helper_debug_{enter,leave}_fb

the non-fbinfo versions of the same function now that I see why
they exist, and that they are not a mangled diff


Author: Maya Rashish <maya@NetBSD.org>

Improve ifdef'ing out fb_info stuff. Undo unintended local diff.


Author: Maya Rashish <maya@NetBSD.org>

Cleanup ifdef goo that got mangled.

Endifs without matching ifdefs and so on.


Author: Maya Rashish <maya@NetBSD.org>

Ifdef out linux framebuffer stuff in drm_fb_helper.

Initialize kernel_fb_helper_lock in drm module load.

Fix up #ifdefs.

Merge linux-drm-v5-6-rc3

Reduce diffs by side-loading some header files like Linux.

From riastradh

Revert cosmetic changes.

Stub out console_lock/unlock and drm_fb_helper_set_suspend.

Reduce some more diffs.

branches: 1.13.2;
Avoid null pointer dereference found by kUBSan with "member access within
null pointer of type 'struct drm_fb_helper_crtc'".

branches: 1.12.4;
Fix vestigial call to drm_fb_helper_set_config.

Remove temporary drm_fb_helper_set_config stub from old code.

Fix bad merge and ifdef out linux fb stuff.

merge linux-drm-v4-4-143

branches: 1.8.10; 1.8.16; 1.8.18;
Support command-line modes by picking up connector modes from the device
properties. The connector name is the key name in the device properties
dictionary.

branches: 1.7.4; 1.7.6;
Expose drm fb helpers for ddb enter/exit.

Make it build and boot on my test machines.

Screen blanks on boot on the Ivy Bridge system with

DRM error in cpt_serr_int_handler: PCH transcoder A FIFO underrun

But after that everything is OK. Appears to be an upstream problem.
To investigate...

I think there's a cache flushing issue somewhere -- there are little
display artefacts on my T60.

fix merge conflicts

branches: 1.4.2;
Fix hot-plug with small patch from upstream before a full update.

branches: 1.3.2;
Fix unused variable warnings in drm2.

Merge riastradh-drm2 to HEAD.

branches: 1.1.1;
Initial revision

Reduce diffs by side-loading some header files like Linux.

From riastradh

Revert cosmetic changes.

Stub out console_lock/unlock and drm_fb_helper_set_suspend.

Reduce some more diffs.

Avoid null pointer dereference found by kUBSan with "member access within
null pointer of type 'struct drm_fb_helper_crtc'".

branches: 1.12.4;
Fix vestigial call to drm_fb_helper_set_config.

Remove temporary drm_fb_helper_set_config stub from old code.

Fix bad merge and ifdef out linux fb stuff.

merge linux-drm-v4-4-143

branches: 1.8.10; 1.8.16; 1.8.18;
Support command-line modes by picking up connector modes from the device
properties. The connector name is the key name in the device properties
dictionary.

branches: 1.7.4; 1.7.6;
Expose drm fb helpers for ddb enter/exit.

Make it build and boot on my test machines.

Screen blanks on boot on the Ivy Bridge system with

DRM error in cpt_serr_int_handler: PCH transcoder A FIFO underrun

But after that everything is OK. Appears to be an upstream problem.
To investigate...

I think there's a cache flushing issue somewhere -- there are little
display artefacts on my T60.

fix merge conflicts

branches: 1.4.2;
Fix hot-plug with small patch from upstream before a full update.

branches: 1.3.2;
Fix unused variable warnings in drm2.

Merge riastradh-drm2 to HEAD.

branches: 1.1.1;
Initial revision

Revert cosmetic changes.

Stub out console_lock/unlock and drm_fb_helper_set_suspend.

Reduce some more diffs.

Avoid null pointer dereference found by kUBSan with "member access within
null pointer of type 'struct drm_fb_helper_crtc'".

branches: 1.12.4;
Fix vestigial call to drm_fb_helper_set_config.

Remove temporary drm_fb_helper_set_config stub from old code.

Fix bad merge and ifdef out linux fb stuff.

merge linux-drm-v4-4-143

branches: 1.8.10; 1.8.16; 1.8.18;
Support command-line modes by picking up connector modes from the device
properties. The connector name is the key name in the device properties
dictionary.

branches: 1.7.4; 1.7.6;
Expose drm fb helpers for ddb enter/exit.

Make it build and boot on my test machines.

Screen blanks on boot on the Ivy Bridge system with

DRM error in cpt_serr_int_handler: PCH transcoder A FIFO underrun

But after that everything is OK. Appears to be an upstream problem.
To investigate...

I think there's a cache flushing issue somewhere -- there are little
display artefacts on my T60.

fix merge conflicts

branches: 1.4.2;
Fix hot-plug with small patch from upstream before a full update.

branches: 1.3.2;
Fix unused variable warnings in drm2.

Merge riastradh-drm2 to HEAD.

branches: 1.1.1;
Initial revision

Avoid null pointer dereference found by kUBSan with "member access within
null pointer of type 'struct drm_fb_helper_crtc'".

Fix vestigial call to drm_fb_helper_set_config.

Remove temporary drm_fb_helper_set_config stub from old code.

Fix bad merge and ifdef out linux fb stuff.

merge linux-drm-v4-4-143

branches: 1.8.16; 1.8.18;
Support command-line modes by picking up connector modes from the device
properties. The connector name is the key name in the device properties
dictionary.

branches: 1.7.4; 1.7.6;
Expose drm fb helpers for ddb enter/exit.

Make it build and boot on my test machines.

Screen blanks on boot on the Ivy Bridge system with

DRM error in cpt_serr_int_handler: PCH transcoder A FIFO underrun

But after that everything is OK. Appears to be an upstream problem.
To investigate...

I think there's a cache flushing issue somewhere -- there are little
display artefacts on my T60.

fix merge conflicts

branches: 1.4.2;
Fix hot-plug with small patch from upstream before a full update.

branches: 1.3.2;
Fix unused variable warnings in drm2.

Merge riastradh-drm2 to HEAD.

branches: 1.1.1;
Initial revision

Fix vestigial call to drm_fb_helper_set_config.

Remove temporary drm_fb_helper_set_config stub from old code.

Fix bad merge and ifdef out linux fb stuff.

merge linux-drm-v4-4-143

branches: 1.8.16;
Support command-line modes by picking up connector modes from the device
properties. The connector name is the key name in the device properties
dictionary.

branches: 1.7.4; 1.7.6;
Expose drm fb helpers for ddb enter/exit.

Make it build and boot on my test machines.

Screen blanks on boot on the Ivy Bridge system with

DRM error in cpt_serr_int_handler: PCH transcoder A FIFO underrun

But after that everything is OK. Appears to be an upstream problem.
To investigate...

I think there's a cache flushing issue somewhere -- there are little
display artefacts on my T60.

fix merge conflicts

branches: 1.4.2;
Fix hot-plug with small patch from upstream before a full update.

branches: 1.3.2;
Fix unused variable warnings in drm2.

Merge riastradh-drm2 to HEAD.

branches: 1.1.1;
Initial revision

Support command-line modes by picking up connector modes from the device
properties. The connector name is the key name in the device properties
dictionary.

branches: 1.7.4; 1.7.6;
Expose drm fb helpers for ddb enter/exit.

Make it build and boot on my test machines.

Screen blanks on boot on the Ivy Bridge system with

DRM error in cpt_serr_int_handler: PCH transcoder A FIFO underrun

But after that everything is OK. Appears to be an upstream problem.
To investigate...

I think there's a cache flushing issue somewhere -- there are little
display artefacts on my T60.

fix merge conflicts

branches: 1.4.2;
Fix hot-plug with small patch from upstream before a full update.

branches: 1.3.2;
Fix unused variable warnings in drm2.

Merge riastradh-drm2 to HEAD.

branches: 1.1.1;
Initial revision