/*
 * Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.com>
 *
 * This file is dual-licensed: you can use it either under the terms
 * of the GPL or the X11 license, at your option. Note that this dual
 * licensing only applies to this file, and not this project as a
 * whole.
 *
 *  a) This file is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of the
 *     License, or (at your option) any later version.
 *
 *     This file is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 * Or, alternatively,
 *
 *  b) Permission is hereby granted, free of charge, to any person
 *     obtaining a copy of this software and associated documentation
 *     files (the "Software"), to deal in the Software without
 *     restriction, including without limitation the rights to use,
 *     copy, modify, merge, publish, distribute, sublicense, and/or
 *     sell copies of the Software, and to permit persons to whom the
 *     Software is furnished to do so, subject to the following
 *     conditions:
 *
 *     The above copyright notice and this permission notice shall be
 *     included in all copies or substantial portions of the Software.
 *
 *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *     OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *     OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef _DT_BINDINGS_CLK_SUN8I_A23_A33_H_
#define _DT_BINDINGS_CLK_SUN8I_A23_A33_H_

#define CLK_CPUX		18

#define CLK_BUS_MIPI_DSI	23
#define CLK_BUS_SS		24
#define CLK_BUS_DMA		25
#define CLK_BUS_MMC0		26
#define CLK_BUS_MMC1		27
#define CLK_BUS_MMC2		28
#define CLK_BUS_NAND		29
#define CLK_BUS_DRAM		30
#define CLK_BUS_HSTIMER		31
#define CLK_BUS_SPI0		32
#define CLK_BUS_SPI1		33
#define CLK_BUS_OTG		34
#define CLK_BUS_EHCI		35
#define CLK_BUS_OHCI		36
#define CLK_BUS_VE		37
#define CLK_BUS_LCD		38
#define CLK_BUS_CSI		39
#define CLK_BUS_DE_BE		40
#define CLK_BUS_DE_FE		41
#define CLK_BUS_GPU		42
#define CLK_BUS_MSGBOX		43
#define CLK_BUS_SPINLOCK	44
#define CLK_BUS_DRC		45
#define CLK_BUS_SAT		46
#define CLK_BUS_CODEC		47
#define CLK_BUS_PIO		48
#define CLK_BUS_I2S0		49
#define CLK_BUS_I2S1		50
#define CLK_BUS_I2C0		51
#define CLK_BUS_I2C1		52
#define CLK_BUS_I2C2		53
#define CLK_BUS_UART0		54
#define CLK_BUS_UART1		55
#define CLK_BUS_UART2		56
#define CLK_BUS_UART3		57
#define CLK_BUS_UART4		58
#define CLK_NAND		59
#define CLK_MMC0		60
#define CLK_MMC0_SAMPLE		61
#define CLK_MMC0_OUTPUT		62
#define CLK_MMC1		63
#define CLK_MMC1_SAMPLE		64
#define CLK_MMC1_OUTPUT		65
#define CLK_MMC2		66
#define CLK_MMC2_SAMPLE		67
#define CLK_MMC2_OUTPUT		68
#define CLK_SS			69
#define CLK_SPI0		70
#define CLK_SPI1		71
#define CLK_I2S0		72
#define CLK_I2S1		73
#define CLK_USB_PHY0		74
#define CLK_USB_PHY1		75
#define CLK_USB_HSIC		76
#define CLK_USB_HSIC_12M	77
#define CLK_USB_OHCI		78

#define CLK_DRAM_VE		80
#define CLK_DRAM_CSI		81
#define CLK_DRAM_DRC		82
#define CLK_DRAM_DE_FE		83
#define CLK_DRAM_DE_BE		84
#define CLK_DE_BE		85
#define CLK_DE_FE		86
#define CLK_LCD_CH0		87
#define CLK_LCD_CH1		88
#define CLK_CSI_SCLK		89
#define CLK_CSI_MCLK		90
#define CLK_VE			91
#define CLK_AC_DIG		92
#define CLK_AC_DIG_4X		93
#define CLK_AVS			94

#define CLK_DSI_SCLK		96
#define CLK_DSI_DPHY		97
#define CLK_DRC			98
#define CLK_GPU			99
#define CLK_ATS			100

#endif /* _DT_BINDINGS_CLK_SUN8I_A23_A33_H_ */
<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/net/sched/em_ipset.c?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>39cb2c9a316e77f6dfba96c543e55b6672d5a37e</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/sched/em_ipset.c?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/net/sched/em_ipset.c?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>net/sched/em_ipset.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/sched/em_ipset.c?id=2c5d9555d6d937966d79d4c6529a5f7b9206e405'>2c5d9555d6d937966d79d4c6529a5f7b9206e405</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/sched/em_ipset.c?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 'net/sched/em_ipset.c')</div><table summary='diffstat' class='diffstat'>