/*
 * Internal header file for QE TDM mode routines.
 *
 * Copyright (C) 2016 Freescale Semiconductor, Inc. All rights reserved.
 *
 * Authors:	Zhao Qiang <qiang.zhao@nxp.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;  either version 2 of the  License, or (at your
 * option) any later version
 */

#ifndef _QE_TDM_H_
#define _QE_TDM_H_

#include <linux/kernel.h>
#include <linux/list.h>

#include <soc/fsl/qe/immap_qe.h>
#include <soc/fsl/qe/qe.h>

#include <soc/fsl/qe/ucc.h>
#include <soc/fsl/qe/ucc_fast.h>

/* SI RAM entries */
#define SIR_LAST	0x0001
#define SIR_BYTE	0x0002
#define SIR_CNT(x)	((x) << 2)
#define SIR_CSEL(x)	((x) << 5)
#define SIR_SGS		0x0200
#define SIR_SWTR	0x4000
#define SIR_MCC		0x8000
#define SIR_IDLE	0

/* SIxMR fields */
#define SIMR_SAD(x) ((x) << 12)
#define SIMR_SDM_NORMAL	0x0000
#define SIMR_SDM_INTERNAL_LOOPBACK	0x0800
#define SIMR_SDM_MASK	0x0c00
#define SIMR_CRT	0x0040
#define SIMR_SL		0x0020
#define SIMR_CE		0x0010
#define SIMR_FE		0x0008
#define SIMR_GM		0x0004
#define SIMR_TFSD(n)	(n)
#define SIMR_RFSD(n)	((n) << 8)

enum tdm_ts_t {
	TDM_TX_TS,
	TDM_RX_TS
};

enum tdm_framer_t {
	TDM_FRAMER_T1,
	TDM_FRAMER_E1
};

enum tdm_mode_t {
	TDM_INTERNAL_LOOPBACK,
	TDM_NORMAL
};

struct si_mode_info {
	u8 simr_rfsd;
	u8 simr_tfsd;
	u8 simr_crt;
	u8 simr_sl;
	u8 simr_ce;
	u8 simr_fe;
	u8 simr_gm;
};

struct ucc_tdm_info {
	struct ucc_fast_info uf_info;
	struct si_mode_info si_info;
};

struct ucc_tdm {
	u16 tdm_port;		/* port for this tdm:TDMA,TDMB */
	u32 siram_entry_id;
	u16 __iomem *siram;
	struct si1 __iomem *si_regs;
	enum tdm_framer_t tdm_framer_type;
	enum tdm_mode_t tdm_mode;
	u8 num_of_ts;		/* the number of timeslots in this tdm frame */
	u32 tx_ts_mask;		/* tx time slot mask */
	u32 rx_ts_mask;		/* rx time slot mask */
};

int ucc_of_parse_tdm(struct device_node *np, struct ucc_tdm *utdm,
		     struct ucc_tdm_info *ut_info);
void ucc_tdm_init(struct ucc_tdm *utdm, struct ucc_tdm_info *ut_info);
#endif
17094b9457a0d53e8505e95a1863'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/tools/arch/microblaze/include?h=nds-private-remove&amp;id=aa8863e5d49417094b9457a0d53e8505e95a1863'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/tools/arch/microblaze/include'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=aa8863e5d49417094b9457a0d53e8505e95a1863'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools?h=nds-private-remove&amp;id=aa8863e5d49417094b9457a0d53e8505e95a1863'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/arch?h=nds-private-remove&amp;id=aa8863e5d49417094b9457a0d53e8505e95a1863'>arch</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/arch/microblaze?h=nds-private-remove&amp;id=aa8863e5d49417094b9457a0d53e8505e95a1863'>microblaze</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/arch/microblaze/include?h=nds-private-remove&amp;id=aa8863e5d49417094b9457a0d53e8505e95a1863'>include</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/tools/arch/microblaze/include?h=nds-private-remove&amp;id=aa8863e5d49417094b9457a0d53e8505e95a1863&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
'>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=3484ecbe0e9deb94afb0b9b6172d77e98eb72b94'>Diffstat</a> (limited to 'include/soc/rockchip/rockchip_sip.h')</div><table summary='diffstat' class='diffstat'>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/atm/speedtch.c?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>39cb2c9a316e77f6dfba96c543e55b6672d5a37e</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/atm/speedtch.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/atm/speedtch.c?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>drivers/usb/atm/speedtch.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/atm/speedtch.c?id=2c5d9555d6d937966d79d4c6529a5f7b9206e405'>2c5d9555d6d937966d79d4c6529a5f7b9206e405</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/atm/speedtch.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/atm/speedtch.c')</div><table summary='diffstat' class='diffstat'>