/*
 * Copyright (c) 2014, Steffen Trumtrar <s.trumtrar@pengutronix.de>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program 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.
 */

#ifndef _DT_BINDINGS_RESET_ALTR_RST_MGR_A10_H
#define _DT_BINDINGS_RESET_ALTR_RST_MGR_A10_H

/* MPUMODRST */
#define CPU0_RESET		0
#define CPU1_RESET		1
#define WDS_RESET		2
#define SCUPER_RESET		3

/* PER0MODRST */
#define EMAC0_RESET		32
#define EMAC1_RESET		33
#define EMAC2_RESET		34
#define USB0_RESET		35
#define USB1_RESET		36
#define NAND_RESET		37
#define QSPI_RESET		38
#define SDMMC_RESET		39
#define EMAC0_OCP_RESET		40
#define EMAC1_OCP_RESET		41
#define EMAC2_OCP_RESET		42
#define USB0_OCP_RESET		43
#define USB1_OCP_RESET		44
#define NAND_OCP_RESET		45
#define QSPI_OCP_RESET		46
#define SDMMC_OCP_RESET		47
#define DMA_RESET		48
#define SPIM0_RESET		49
#define SPIM1_RESET		50
#define SPIS0_RESET		51
#define SPIS1_RESET		52
#define DMA_OCP_RESET		53
#define EMAC_PTP_RESET		54
/* 55 is empty*/
#define DMAIF0_RESET		56
#define DMAIF1_RESET		57
#define DMAIF2_RESET		58
#define DMAIF3_RESET		59
#define DMAIF4_RESET		60
#define DMAIF5_RESET		61
#define DMAIF6_RESET		62
#define DMAIF7_RESET		63

/* PER1MODRST */
#define L4WD0_RESET		64
#define L4WD1_RESET		65
#define L4SYSTIMER0_RESET	66
#define L4SYSTIMER1_RESET	67
#define SPTIMER0_RESET		68
#define SPTIMER1_RESET		69
/* 70-71 is reserved */
#define I2C0_RESET		72
#define I2C1_RESET		73
#define I2C2_RESET		74
#define I2C3_RESET		75
#define I2C4_RESET		76
/* 77-79 is reserved */
#define UART0_RESET		80
#define UART1_RESET		81
/* 82-87 is reserved */
#define GPIO0_RESET		88
#define GPIO1_RESET		89
#define GPIO2_RESET		90

/* BRGMODRST */
#define HPS2FPGA_RESET		96
#define LWHPS2FPGA_RESET	97
#define FPGA2HPS_RESET		98
#define F2SSDRAM0_RESET		99
#define F2SSDRAM1_RESET		100
#define F2SSDRAM2_RESET		101
#define DDRSCH_RESET		102

/* SYSMODRST*/
#define ROM_RESET		128
#define OCRAM_RESET		129
/* 130 is reserved */
#define FPGAMGR_RESET		131
#define S2F_RESET		132
#define SYSDBG_RESET		133
#define OCRAM_OCP_RESET		134

/* COLDMODRST */
#define CLKMGRCOLD_RESET	160
/* 161-162 is reserved */
#define S2FCOLD_RESET		163
#define TIMESTAMPCOLD_RESET	164
#define TAPCOLD_RESET		165
#define HMCCOLD_RESET		166
#define IOMGRCOLD_RESET		167

/* NRSTMODRST */
#define NRSTPINOE_RESET		192

/* DBGMODRST */
#define DBG_RESET		224
#endif
/linux/net-next.git/commit/?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>serial</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/cypress_m8.c?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>cypress_m8.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/drivers/usb/serial/cypress_m8.c?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>39cb2c9a316e77f6dfba96c543e55b6672d5a37e</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/serial/cypress_m8.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/drivers/usb/serial/cypress_m8.c?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>drivers/usb/serial/cypress_m8.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/cypress_m8.c?id=2c5d9555d6d937966d79d4c6529a5f7b9206e405'>2c5d9555d6d937966d79d4c6529a5f7b9206e405</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/serial/cypress_m8.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 'drivers/usb/serial/cypress_m8.c')</div><table summary='diffstat' class='diffstat'>