[Bug 96859] New: No firmware log in debugfs i915_guc_log_dump

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96859

            Bug ID: 96859
           Summary: No firmware log in debugfs i915_guc_log_dump
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: christophe.prigent at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Platform: APL system
CPU Name : Intel(R) Genuine Processor @ 1.1 GHz (family: 6, model: 12,
stepping: 9) 4 cores
QDF : Q6HE
SoC : B1
CRB : Apollo Lake DDR3L RVP1A FAB2
Reworks : R19, R20

Software 
Bios: 144_B10 APLK_B0_IFWI_X64_R_2016_06_27_0956_SPI_RVP1.bin from
\\gar\ec\proj\ba\CCG\APL
BIOS\External\BIOS_Release\Daily\v144_10_2016_WW27.1\IFWI\IFWI_RVP1_Release\IFWI
KSC: 1.15
Linux distribution: Ubuntu 16.04 64 bits
Kernel: drm-intel-nightly 4.7.0-rc5 2fe5da8 from
http://cgit.freedesktop.org/drm-intel/
  commit 2fe5da8adcbe5a34830b98c63878eea756e977a2
  Author: Chris Wilson <chris at chris-wilson.co.uk>
  Date:   Sat Jul 2 19:32:50 2016 +0100
  drm-intel-nightly: 2016y-07m-02d-18h-31m-39s UTC integration manifest
drm: libdrm-2.4.68-11 7996a87 from git://anongit.freedesktop.org/mesa/drm
mesa: mesa-11.2.2 3a9f628from git://anongit.freedesktop.org/mesa/mesa
cairo: 1.15.2 db8a7f1 from git://anongit.freedesktop.org/cairo
server: xorg-server-1.18.0-443 3762edd from
git://git.freedesktop.org/git/xorg/xserver
xf86-video-intel: 2.99.917-674 9154dff from
git://git.freedesktop.org/git/xorg/driver/xf86-video-intel
libva: libva-1.7.0-26 c36971c from git://git.freedesktop.org/git/vaapi/libva
vaapi-intel-driver: 1.7.0-53 bcde10d from
git://git.freedesktop.org/git/vaapi/intel-driver
GuC 8.7
DMC 1.07 from https://01.org/linuxgraphics/downloads/broxton-dmc-1.07

Steps:
------
1. Add kernel boot command line: i915.guc_log_level=1
2. Reboot
3. Check content of i915_guc_log_dump:
# cat /sys/kernel/debug/dri/0/i915_guc_log_dump

Actual result:
--------------
3. File is empty

Expected result:
-----------------
3. Reading from i915_guc_load_status will print out firmware loading status and
scratch registers value

Info:
-----
Same result with: i915.guc_log_level=10, i915.guc_log_level=0xe,
i915.guc_log_level

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