/*
 * wm8978.h		--  codec driver for WM8978
 *
 * Copyright 2009 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __WM8978_H__
#define __WM8978_H__

/*
 * Register values.
 */
#define WM8978_RESET				0x00
#define WM8978_POWER_MANAGEMENT_1		0x01
#define WM8978_POWER_MANAGEMENT_2		0x02
#define WM8978_POWER_MANAGEMENT_3		0x03
#define WM8978_AUDIO_INTERFACE			0x04
#define WM8978_COMPANDING_CONTROL		0x05
#define WM8978_CLOCKING				0x06
#define WM8978_ADDITIONAL_CONTROL		0x07
#define WM8978_GPIO_CONTROL			0x08
#define WM8978_JACK_DETECT_CONTROL_1		0x09
#define WM8978_DAC_CONTROL			0x0A
#define WM8978_LEFT_DAC_DIGITAL_VOLUME		0x0B
#define WM8978_RIGHT_DAC_DIGITAL_VOLUME		0x0C
#define WM8978_JACK_DETECT_CONTROL_2		0x0D
#define WM8978_ADC_CONTROL			0x0E
#define WM8978_LEFT_ADC_DIGITAL_VOLUME		0x0F
#define WM8978_RIGHT_ADC_DIGITAL_VOLUME		0x10
#define WM8978_EQ1				0x12
#define WM8978_EQ2				0x13
#define WM8978_EQ3				0x14
#define WM8978_EQ4				0x15
#define WM8978_EQ5				0x16
#define WM8978_DAC_LIMITER_1			0x18
#define WM8978_DAC_LIMITER_2			0x19
#define WM8978_NOTCH_FILTER_1			0x1b
#define WM8978_NOTCH_FILTER_2			0x1c
#define WM8978_NOTCH_FILTER_3			0x1d
#define WM8978_NOTCH_FILTER_4			0x1e
#define WM8978_ALC_CONTROL_1			0x20
#define WM8978_ALC_CONTROL_2			0x21
#define WM8978_ALC_CONTROL_3			0x22
#define WM8978_NOISE_GATE			0x23
#define WM8978_PLL_N				0x24
#define WM8978_PLL_K1				0x25
#define WM8978_PLL_K2				0x26
#define WM8978_PLL_K3				0x27
#define WM8978_3D_CONTROL			0x29
#define WM8978_BEEP_CONTROL			0x2b
#define WM8978_INPUT_CONTROL			0x2c
#define WM8978_LEFT_INP_PGA_CONTROL		0x2d
#define WM8978_RIGHT_INP_PGA_CONTROL		0x2e
#define WM8978_LEFT_ADC_BOOST_CONTROL		0x2f
#define WM8978_RIGHT_ADC_BOOST_CONTROL		0x30
#define WM8978_OUTPUT_CONTROL			0x31
#define WM8978_LEFT_MIXER_CONTROL		0x32
#define WM8978_RIGHT_MIXER_CONTROL		0x33
#define WM8978_LOUT1_HP_CONTROL			0x34
#define WM8978_ROUT1_HP_CONTROL			0x35
#define WM8978_LOUT2_SPK_CONTROL		0x36
#define WM8978_ROUT2_SPK_CONTROL		0x37
#define WM8978_OUT3_MIXER_CONTROL		0x38
#define WM8978_OUT4_MIXER_CONTROL		0x39

#define WM8978_MAX_REGISTER			0x39

#define WM8978_CACHEREGNUM			58

/* Clock divider Id's */
enum wm8978_clk_id {
	WM8978_OPCLKRATE,
	WM8978_BCLKDIV,
};

enum wm8978_sysclk_src {
	WM8978_MCLK = 0,
	WM8978_PLL,
};

#endif	/* __WM8978_H__ */
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>uapi</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>asm-generic</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic/signal-defs.h?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>signal-defs.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='39cb2c9a316e77f6dfba96c543e55b6672d5a37e'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-29 13:50:06 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-29 13:50:06 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic/signal-defs.h?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>39cb2c9a316e77f6dfba96c543e55b6672d5a37e</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/uapi/asm-generic/signal-defs.h?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>98fe974ee4e20121253de7f61fc8d01bdb3821c1</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/uapi/asm-generic/signal-defs.h?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>include/uapi/asm-generic/signal-defs.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic/signal-defs.h?id=2c5d9555d6d937966d79d4c6529a5f7b9206e405'>2c5d9555d6d937966d79d4c6529a5f7b9206e405</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/uapi/asm-generic/signal-defs.h?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e&amp;id2=2c5d9555d6d937966d79d4c6529a5f7b9206e405'>diff</a>)</td></tr></table>
<div class='commit-subject'>drm/i915: Check for NULL i915_vma in intel_unpin_fb_obj()</div><div class='commit-msg'>I've seen this trigger twice now, where the i915_gem_object_to_ggtt()
call in intel_unpin_fb_obj() returns NULL, resulting in an oops
immediately afterwards as the (inlined) call to i915_vma_unpin_fence()
tries to dereference it.

It seems to be some race condition where the object is going away at
shutdown time, since both times happened when shutting down the X
server.  The call chains were different:

 - VT ioctl(KDSETMODE, KD_TEXT):

    intel_cleanup_plane_fb+0x5b/0xa0 [i915]
    drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper]
    intel_atomic_commit_tail+0x749/0xfe0 [i915]
    intel_atomic_commit+0x3cb/0x4f0 [i915]
    drm_atomic_commit+0x4b/0x50 [drm]
    restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper]
    drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper]
    drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper]
    intel_fbdev_set_par+0x18/0x70 [i915]
    fb_set_var+0x236/0x460
    fbcon_blank+0x30f/0x350
    do_unblank_screen+0xd2/0x1a0
    vt_ioctl+0x507/0x12a0
    tty_ioctl+0x355/0xc30
    do_vfs_ioctl+0xa3/0x5e0
    SyS_ioctl+0x79/0x90
    entry_SYSCALL_64_fastpath+0x13/0x94

 - i915 unpin_work workqueue:

    intel_unpin_work_fn+0x58/0x140 [i915]
    process_one_work+0x1f1/0x480
    worker_thread+0x48/0x4d0
    kthread+0x101/0x140

and this patch purely papers over the issue by adding a NULL pointer
check and a WARN_ON_ONCE() to avoid the oops that would then generally
make the machine unresponsive.

Other callers of i915_gem_object_to_ggtt() seem to also check for the
returned pointer being NULL and warn about it, so this clearly has
happened before in other places.

[ Reported it originally to the i915 developers on Jan 8, applying the
  ugly workaround on my own now after triggering the problem for the
  second time with no feedback.

  This is likely to be the same bug reported as

     https://bugs.freedesktop.org/show_bug.cgi?id=98829
     https://bugs.freedesktop.org/show_bug.cgi?id=99134

  which has a patch for the underlying problem, but it hasn't gotten to
  me, so I'm applying the workaround. ]

Cc: Daniel Vetter &lt;daniel.vetter@intel.com&gt;
Cc: Jani Nikula &lt;jani.nikula@linux.intel.com&gt;
Cc: Ville Syrjälä &lt;ville.syrjala@linux.intel.com&gt;
Cc: Chris Wilson &lt;chris@chris-wilson.co.uk&gt;
Cc: Maarten Lankhorst &lt;maarten.lankhorst@linux.intel.com&gt;
Cc: Tvrtko Ursulin &lt;tvrtko.ursulin@intel.com&gt;
Cc: Imre Deak &lt;imre.deak@intel.com&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>Diffstat</a> (limited to 'include/uapi/asm-generic/signal-defs.h')</div><table summary='diffstat' class='diffstat'>