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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] RPM wakelock ref not held during HW access (check_wm_state->skl_ddb_get_hw_state)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93441">93441</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[SKL] RPM wakelock ref not held during HW access (check_wm_state->skl_ddb_get_hw_state)
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>critical
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>imre.deak@intel.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<div>
<pre>The WARN below started to appear after adding stricter RPM reference checking
asserts. Testcases that triggered this during CI runs; the list may be not
exact since we stop reporting errors after the first one (by using WARN_ONCE):
igt@kms_flip@basic-flip-vs-modeset
igt@kms_flip@basic-flip-vs-wf_vblank
igt@kms_pipe_crc_basic@read-crc-pipe-c
[ 250.913323] ------------[ cut here ]------------
[ 250.913377] WARNING: CPU: 0 PID: 6422 at
drivers/gpu/drm/i915/intel_drv.h:1446 gen9_read32+0x336/0x3f0 [i915]()
[ 250.913381] RPM wakelock ref not held during HW access
[ 250.913385] Modules linked in:
[ 250.913389] i915 ax88179_178a usbnet mii x86_pkg_temp_thermal
intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul mei_me mei i2c_hid
e1000e ptp pps_core [last unloaded: i915]
[ 250.913422] CPU: 0 PID: 6422 Comm: kms_flip Tainted: G U W
4.4.0-rc5-gfxbench+ #1
[ 250.913426] Hardware name: System manufacturer System Product
Name/Z170M-PLUS, BIOS 0408 08/28/2015
[ 250.913430] ffffffffa02e68a0 ffff8802479e39c8 ffffffff813e000c
ffff8802479e3a10
[ 250.913439] ffff8802479e3a00 ffffffff810746a1 000000000007027c
ffff8802479e3b52
[ 250.913447] 000000000007027c ffff8801fb640000 0000000000000001
ffff8802479e3a60
[ 250.913455] Call Trace:
[ 250.913466] [<ffffffff813e000c>] dump_stack+0x4e/0x82
[ 250.913473] [<ffffffff810746a1>] warn_slowpath_common+0x81/0xc0
[ 250.913478] [<ffffffff81074727>] warn_slowpath_fmt+0x47/0x50
[ 250.913487] [<ffffffff810c5a3d>] ? trace_hardirqs_on+0xd/0x10
[ 250.913528] [<ffffffffa02596b6>] gen9_read32+0x336/0x3f0 [i915]
[ 250.913537] [<ffffffff81796919>] ? mutex_unlock+0x9/0x10
[ 250.913561] [<ffffffffa0210a32>] skl_ddb_get_hw_state+0xa2/0x160 [i915]
[ 250.913605] [<ffffffffa0269ac3>] check_wm_state+0x43/0x1b0 [i915]
[ 250.913650] [<ffffffffa027a58b>] intel_atomic_commit+0x98b/0x17f0 [i915]
[ 250.913699] [<ffffffff8150ed17>] ?
drm_atomic_add_affected_connectors+0x87/0xf0
[ 250.913706] [<ffffffff8150e632>] drm_atomic_commit+0x32/0x50
[ 250.913715] [<ffffffff814eb705>] drm_atomic_helper_set_config+0x75/0xb0
[ 250.913726] [<ffffffff814fd640>] drm_mode_set_config_internal+0x60/0x110
[ 250.913733] [<ffffffff815023d6>] drm_mode_setcrtc+0x186/0x4f0
[ 250.913739] [<ffffffff811844f8>] ? __might_fault+0x48/0xa0
[ 250.913761] [<ffffffff814f450d>] drm_ioctl+0x13d/0x590
[ 250.913774] [<ffffffff81502250>] ? drm_mode_setplane+0x1b0/0x1b0
[ 250.913789] [<ffffffff811c2793>] ? __vfs_read+0x23/0xd0
[ 250.913801] [<ffffffff811d53ec>] do_vfs_ioctl+0x2fc/0x550
[ 250.913817] [<ffffffff811e0e5a>] ? __fget_light+0x6a/0x90
[ 250.913829] [<ffffffff811d567c>] SyS_ioctl+0x3c/0x70
[ 250.913846] [<ffffffff8179a45b>] entry_SYSCALL_64_fastpath+0x16/0x73
[ 250.913857] ---[ end trace 69fd11dcfc73e82c ]---</pre>
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