/*
 * Copyright (c) 2010 Nuvoton technology corporation.
 *
 * Wan ZongShun <mcuos.com@gmail.com>
 *
 * This program 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;version 2 of the License.
 *
 */

#ifndef _NUC900_AUDIO_H
#define _NUC900_AUDIO_H

#include <linux/io.h>

/* Audio Control Registers */
#define ACTL_CON		0x00
#define ACTL_RESET		0x04
#define ACTL_RDSTB		0x08
#define ACTL_RDST_LENGTH	0x0C
#define ACTL_RDSTC		0x10
#define ACTL_RSR		0x14
#define ACTL_PDSTB		0x18
#define ACTL_PDST_LENGTH	0x1C
#define ACTL_PDSTC		0x20
#define ACTL_PSR		0x24
#define ACTL_IISCON		0x28
#define ACTL_ACCON		0x2C
#define ACTL_ACOS0		0x30
#define ACTL_ACOS1		0x34
#define ACTL_ACOS2		0x38
#define ACTL_ACIS0		0x3C
#define ACTL_ACIS1		0x40
#define ACTL_ACIS2		0x44
#define ACTL_COUNTER		0x48

/* bit definition of REG_ACTL_CON register */
#define R_DMA_IRQ		0x1000
#define T_DMA_IRQ		0x0800
#define IIS_AC_PIN_SEL		0x0100
#define FIFO_TH			0x0080
#define ADC_EN			0x0010
#define M80_EN			0x0008
#define ACLINK_EN		0x0004
#define IIS_EN			0x0002

/* bit definition of REG_ACTL_RESET register */
#define W5691_PLAY		0x20000
#define ACTL_RESET_BIT		0x10000
#define RECORD_RIGHT_CHNNEL	0x08000
#define RECORD_LEFT_CHNNEL	0x04000
#define PLAY_RIGHT_CHNNEL	0x02000
#define PLAY_LEFT_CHNNEL	0x01000
#define DAC_PLAY		0x00800
#define ADC_RECORD		0x00400
#define M80_PLAY		0x00200
#define AC_RECORD		0x00100
#define AC_PLAY			0x00080
#define IIS_RECORD		0x00040
#define IIS_PLAY		0x00020
#define DAC_RESET		0x00010
#define ADC_RESET		0x00008
#define M80_RESET		0x00004
#define AC_RESET		0x00002
#define IIS_RESET		0x00001

/* bit definition of REG_ACTL_ACCON register */
#define AC_BCLK_PU_EN		0x20
#define AC_R_FINISH		0x10
#define AC_W_FINISH		0x08
#define AC_W_RES		0x04
#define AC_C_RES		0x02

/* bit definition of ACTL_RSR register */
#define R_FIFO_EMPTY		0x04
#define R_DMA_END_IRQ		0x02
#define R_DMA_MIDDLE_IRQ	0x01

/* bit definition of ACTL_PSR register */
#define P_FIFO_EMPTY		0x04
#define P_DMA_END_IRQ		0x02
#define P_DMA_MIDDLE_IRQ	0x01

/* bit definition of ACTL_ACOS0 register */
#define SLOT1_VALID		0x01
#define SLOT2_VALID		0x02
#define SLOT3_VALID		0x04
#define SLOT4_VALID		0x08
#define VALID_FRAME		0x10

/* bit definition of ACTL_ACOS1 register */
#define R_WB			0x80

#define CODEC_READY		0x10
#define RESET_PRSR		0x00
#define AUDIO_WRITE(addr, val)	__raw_writel(val, addr)
#define AUDIO_READ(addr)	__raw_readl(addr)

struct nuc900_audio {
	void __iomem *mmio;
	spinlock_t lock;
	unsigned long irq_num;
	struct resource *res;
	struct clk *clk;
	struct device *dev;

};

extern struct nuc900_audio *nuc900_ac97_data;

#endif /*end _NUC900_AUDIO_H */
t?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/llc?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>llc</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/llc/llc_sap.c?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>llc_sap.c</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/net/llc/llc_sap.c?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>39cb2c9a316e77f6dfba96c543e55b6672d5a37e</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/llc/llc_sap.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/llc/llc_sap.c?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>net/llc/llc_sap.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/llc/llc_sap.c?id=2c5d9555d6d937966d79d4c6529a5f7b9206e405'>2c5d9555d6d937966d79d4c6529a5f7b9206e405</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/llc/llc_sap.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/llc/llc_sap.c')</div><table summary='diffstat' class='diffstat'>