[Intel-gfx] [PATCH] drm/i915/ilk: Fix warning when reading emon_status with no output

[Chris Wilson]

Quoting Souza, Jose (2018-11-20 22:07:14)
> On Mon, 2018-11-19 at 17:05 -0800, Rodrigo Vivi wrote:
> > On Mon, Nov 19, 2018 at 03:01:01PM -0800, José Roberto de Souza
> > wrote:
> > > When there is no output no one will hold a runtime_pm reference
> > > causing a warning when trying to read emom_status in debugfs.
> > > 
> > > [22.756480] ------------[ cut here ]------------
> > > [22.756489] RPM wakelock ref not held during HW access
> > > [22.756578] WARNING: CPU: 0 PID: 1058 at
> > > drivers/gpu/drm/i915/intel_drv.h:2104 gen5_read32+0x16b/0x1a0
> > > [i915]
> > > [22.756580] Modules linked in: snd_hda_codec_hdmi
> > > snd_hda_codec_realtek snd_hda_codec_generic i915 coretemp
> > > crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_intel
> > > snd_hda_codec snd_hwdep snd_hda_core e1000e snd_pcm mei_me
> > > prime_numbers mei lpc_ich
> > > [22.756595] CPU: 0 PID: 1058 Comm: debugfs_test Not tainted 4.20.0-
> > > rc1-CI-Trybot_3219+ #1
> > > [22.756597] Hardware name: Hewlett-Packard HP Compaq 8100 Elite SFF
> > > PC/304Ah, BIOS 786H1 v01.13 07/14/2011
> > > [22.756634] RIP: 0010:gen5_read32+0x16b/0x1a0 [i915]
> > > [22.756637] Code: a4 ea e0 0f 0b e9 d2 fe ff ff 80 3d a5 71 19 00
> > > 00 0f 85 d3 fe ff ff 48 c7 c7 48 d0 2d a0 c6 05 91 71 19 00 01 e8
> > > 35 a4 ea e0 <0f> 0b e9 b9 fe ff ff e8 69 c6 f2 e0 85 c0 75 92 48 c7
> > > c2 78 d0 2d
> > > [22.756639] RSP: 0018:ffffc90000f1fd38 EFLAGS: 00010282
> > > [22.756642] RAX: 0000000000000000 RBX: ffff8801f7ab0000 RCX:
> > > 0000000000000006
> > > [22.756643] RDX: 0000000000000006 RSI: ffffffff8212886a RDI:
> > > ffffffff820d6d57
> > > [22.756645] RBP: 0000000000011020 R08: 0000000043e3d1a8 R09:
> > > 0000000000000000
> > > [22.756647] R10: ffffc90000f1fd80 R11: 0000000000000000 R12:
> > > 0000000000000001
> > > [22.756649] R13: ffff8801f7ab0068 R14: 0000000000000001 R15:
> > > ffff88020d53d188
> > > [22.756651] FS:  00007f2878849980(0000) GS:ffff880213a00000(0000)
> > > knlGS:0000000000000000
> > > [22.756653] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > [22.756655] CR2: 00005638deedf028 CR3: 0000000203292001 CR4:
> > > 00000000000206f0
> > > [22.756657] Call Trace:
> > > [22.756689]  i915_mch_val+0x1b/0x60 [i915]
> > > [22.756721]  i915_emon_status+0x45/0xd0 [i915]
> > > [22.756730]  seq_read+0xdb/0x3c0
> > > [22.756736]  ? lockdep_hardirqs_off+0x94/0xd0
> > > [22.756740]  ? __slab_free+0x24e/0x510
> > > [22.756746]  full_proxy_read+0x52/0x90
> > > [22.756752]  __vfs_read+0x31/0x170
> > > [22.756759]  ? do_sys_open+0x13b/0x240
> > > [22.756763]  ? rcu_read_lock_sched_held+0x6f/0x80
> > > [22.756766]  vfs_read+0x9e/0x140
> > > [22.756770]  ksys_read+0x50/0xc0
> > > [22.756775]  do_syscall_64+0x55/0x190
> > > [22.756781]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> > > [22.756783] RIP: 0033:0x7f28781dc34e
> > > [22.756786] Code: 00 00 00 00 48 8b 15 71 8c 20 00 f7 d8 64 89 02
> > > 48 c7 c0 ff ff ff ff c3 0f 1f 40 00 8b 05 ba d0 20 00 85 c0 75 16
> > > 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5a f3 c3 0f 1f 84 00 00 00 00 00
> > > 41 54 55 49
> > > [22.756787] RSP: 002b:00007ffd33fa0d08 EFLAGS: 00000246 ORIG_RAX:
> > > 0000000000000000
> > > [22.756790] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
> > > 00007f28781dc34e
> > > [22.756792] RDX: 0000000000000200 RSI: 00007ffd33fa0d50 RDI:
> > > 0000000000000008
> > > [22.756794] RBP: 00007ffd33fa0f60 R08: 0000000000000000 R09:
> > > 0000000000000020
> > > [22.756796] R10: 0000000000000000 R11: 0000000000000246 R12:
> > > 00005638de45c2c0
> > > [22.756797] R13: 00007ffd33fa14b0 R14: 0000000000000000 R15:
> > > 0000000000000000
> > > [22.756806] irq event stamp: 47950
> > > [22.756811] hardirqs last  enabled at (47949): [<ffffffff810fba74>]
> > > vprintk_emit+0x124/0x320
> > > [22.756813] hardirqs last disabled at (47950): [<ffffffff810019b0>]
> > > trace_hardirqs_off_thunk+0x1a/0x1c
> > > [22.756816] softirqs last  enabled at (47518): [<ffffffff81c0033a>]
> > > __do_softirq+0x33a/0x4b9
> > > [22.756820] softirqs last disabled at (47479): [<ffffffff8108df29>]
> > > irq_exit+0xa9/0xc0
> > > [22.756858] WARNING: CPU: 0 PID: 1058 at
> > > drivers/gpu/drm/i915/intel_drv.h:2104 gen5_read32+0x16b/0x1a0
> > > [i915]
> > > [22.756860] ---[ end trace bf56fa7d6a3cbf7a ]
> > > 
> > > Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> > 
> > Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> 
> Thanks for the review, pushed to drm-intel-next-queued.

I have been posting the fix for this for a few years. Cheers.
-Chris