[Bug 88540] New: [All - Bisected] slow cursor movements with atomic plane helpers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88540

            Bug ID: 88540
           Summary: [All - Bisected] slow cursor movements with atomic
                    plane helpers
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: rodrigo.vivi at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 112399
  --> https://bugs.freedesktop.org/attachment.cgi?id=112399&action=edit
dmesg

==System Environment==

--------------------------
Regression: Yes.

Non-working platforms: I've faced on BDW and BSW but I believe it can affect
all platforms.

==kernel==

drm-intel-nightly: 2015y-01m-17d-09h-41m-12s UTC integration manifest

==Bug detailed description==

System gets impossible to use due very slow cursor movements.

bisect took me to the point we change to atomic plane helpers, but it can be a
miss usage of atomic helpers everywhere else.

 drm/i915: Move to atomic plane helpers (v9)

attached dmesg shows many calls of drm_atomic_set_fb_for_plane whenever moving
cursor.

[  103.143044] [drm:drm_atomic_set_fb_for_plane] Set [FB:45] for plane state
ffff88009a1ce680
[  103.159720] [drm:drm_atomic_set_fb_for_plane] Set [FB:45] for plane state
ffff88009a1ce300
[  103.176653] [drm:drm_atomic_set_fb_for_plane] Set [FB:45] for plane state
ffff88009a1ce680
[  104.696065] [drm:drm_atomic_set_fb_for_plane] Set [NOFB] for plane state
ffff88009b0a2600

==Reproduce steps==

Just boot a system with kde environment and *try* to use the cursor.

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