#ifndef REMOTE_UNWIND_LIBUNWIND
#include <errno.h>
#include <libunwind.h>
#include "perf_regs.h"
#include "../../util/unwind.h"
#include "../../util/debug.h"
#endif

int LIBUNWIND__ARCH_REG_ID(int regnum)
{
	switch (regnum) {
	case UNW_AARCH64_X0:
		return PERF_REG_ARM64_X0;
	case UNW_AARCH64_X1:
		return PERF_REG_ARM64_X1;
	case UNW_AARCH64_X2:
		return PERF_REG_ARM64_X2;
	case UNW_AARCH64_X3:
		return PERF_REG_ARM64_X3;
	case UNW_AARCH64_X4:
		return PERF_REG_ARM64_X4;
	case UNW_AARCH64_X5:
		return PERF_REG_ARM64_X5;
	case UNW_AARCH64_X6:
		return PERF_REG_ARM64_X6;
	case UNW_AARCH64_X7:
		return PERF_REG_ARM64_X7;
	case UNW_AARCH64_X8:
		return PERF_REG_ARM64_X8;
	case UNW_AARCH64_X9:
		return PERF_REG_ARM64_X9;
	case UNW_AARCH64_X10:
		return PERF_REG_ARM64_X10;
	case UNW_AARCH64_X11:
		return PERF_REG_ARM64_X11;
	case UNW_AARCH64_X12:
		return PERF_REG_ARM64_X12;
	case UNW_AARCH64_X13:
		return PERF_REG_ARM64_X13;
	case UNW_AARCH64_X14:
		return PERF_REG_ARM64_X14;
	case UNW_AARCH64_X15:
		return PERF_REG_ARM64_X15;
	case UNW_AARCH64_X16:
		return PERF_REG_ARM64_X16;
	case UNW_AARCH64_X17:
		return PERF_REG_ARM64_X17;
	case UNW_AARCH64_X18:
		return PERF_REG_ARM64_X18;
	case UNW_AARCH64_X19:
		return PERF_REG_ARM64_X19;
	case UNW_AARCH64_X20:
		return PERF_REG_ARM64_X20;
	case UNW_AARCH64_X21:
		return PERF_REG_ARM64_X21;
	case UNW_AARCH64_X22:
		return PERF_REG_ARM64_X22;
	case UNW_AARCH64_X23:
		return PERF_REG_ARM64_X23;
	case UNW_AARCH64_X24:
		return PERF_REG_ARM64_X24;
	case UNW_AARCH64_X25:
		return PERF_REG_ARM64_X25;
	case UNW_AARCH64_X26:
		return PERF_REG_ARM64_X26;
	case UNW_AARCH64_X27:
		return PERF_REG_ARM64_X27;
	case UNW_AARCH64_X28:
		return PERF_REG_ARM64_X28;
	case UNW_AARCH64_X29:
		return PERF_REG_ARM64_X29;
	case UNW_AARCH64_X30:
		return PERF_REG_ARM64_LR;
	case UNW_AARCH64_SP:
		return PERF_REG_ARM64_SP;
	case UNW_AARCH64_PC:
		return PERF_REG_ARM64_PC;
	default:
		pr_err("unwind: invalid reg id %d\n", regnum);
		return -EINVAL;
	}

	return -EINVAL;
}
t/commit/include/dt-bindings/clock/bcm21664.h?id=d3498fbaf386f9d540cdde7211ebb2d502b2b365'>commit</a><a class='active' href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/clock/bcm21664.h?id=d3498fbaf386f9d540cdde7211ebb2d502b2b365&amp;id2=0c461cb727d146c9ef2d3e86214f498b78b7d125'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/clock/bcm21664.h'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/diff/?id=d3498fbaf386f9d540cdde7211ebb2d502b2b365&amp;id2=0c461cb727d146c9ef2d3e86214f498b78b7d125'>root</a>/<a href='/cgit.cgi/linux/net-next.git/diff/include?id=d3498fbaf386f9d540cdde7211ebb2d502b2b365&amp;id2=0c461cb727d146c9ef2d3e86214f498b78b7d125'>include</a>/<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings?id=d3498fbaf386f9d540cdde7211ebb2d502b2b365&amp;id2=0c461cb727d146c9ef2d3e86214f498b78b7d125'>dt-bindings</a>/<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/clock?id=d3498fbaf386f9d540cdde7211ebb2d502b2b365&amp;id2=0c461cb727d146c9ef2d3e86214f498b78b7d125'>clock</a>/<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/clock/bcm21664.h?id=d3498fbaf386f9d540cdde7211ebb2d502b2b365&amp;id2=0c461cb727d146c9ef2d3e86214f498b78b7d125'>bcm21664.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='d3498fbaf386f9d540cdde7211ebb2d502b2b365'/><input type='hidden' name='id2' value='0c461cb727d146c9ef2d3e86214f498b78b7d125'/><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><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=d3498fbaf386f9d540cdde7211ebb2d502b2b365&amp;id2=0c461cb727d146c9ef2d3e86214f498b78b7d125'>Diffstat</a> (limited to 'include/dt-bindings/clock/bcm21664.h')</div><table summary='diffstat' class='diffstat'>tree/?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>98fe974ee4e20121253de7f61fc8d01bdb3821c1</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/dt-bindings/clock/imx1-clock.h?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>include/dt-bindings/clock/imx1-clock.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/clock/imx1-clock.h?id=2c5d9555d6d937966d79d4c6529a5f7b9206e405'>2c5d9555d6d937966d79d4c6529a5f7b9206e405</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/clock/imx1-clock.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/dt-bindings/clock/imx1-clock.h')</div><table summary='diffstat' class='diffstat'>