/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#ifndef __DIO_DOT_H__
#define __DIO_DOT_H__

#include <linux/buffer_head.h>
#include <linux/string.h>
#include "incore.h"

static inline void gfs2_buffer_clear(struct buffer_head *bh)
{
	memset(bh->b_data, 0, bh->b_size);
}

static inline void gfs2_buffer_clear_tail(struct buffer_head *bh, int head)
{
	BUG_ON(head > bh->b_size);
	memset(bh->b_data + head, 0, bh->b_size - head);
}

static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh,
					 int to_head,
					 struct buffer_head *from_bh,
					 int from_head)
{
	BUG_ON(from_head < to_head);
	memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head,
	       from_bh->b_size - from_head);
	memset(to_bh->b_data + to_bh->b_size + to_head - from_head,
	       0, from_head - to_head);
}

extern const struct address_space_operations gfs2_meta_aops;
extern const struct address_space_operations gfs2_rgrp_aops;

static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
{
	struct inode *inode = mapping->host;
	if (mapping->a_ops == &gfs2_meta_aops)
		return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd;
	else if (mapping->a_ops == &gfs2_rgrp_aops)
		return container_of(mapping, struct gfs2_sbd, sd_aspace);
	else
		return inode->i_sb->s_fs_info;
}

extern struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno);
extern int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
			  int rahead, struct buffer_head **bhp);
extern int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh);
extern struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno,
				       int create);
enum {
	REMOVE_JDATA = 0,
	REMOVE_META = 1,
};

extern void gfs2_remove_from_journal(struct buffer_head *bh, int meta);
extern void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
extern int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
				     struct buffer_head **bhp);

static inline int gfs2_meta_inode_buffer(struct gfs2_inode *ip,
					 struct buffer_head **bhp)
{
	return gfs2_meta_indirect_buffer(ip, 0, ip->i_no_addr, bhp);
}

struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen);

#define buffer_busy(bh) \
((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))

#endif /* __DIO_DOT_H__ */

' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/soc?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>soc</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/sh?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>sh</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/sh/siu_dai.c?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>siu_dai.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='bf29bddf0417a4783da3b24e8c9e017ac649326f'/><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>Jiri Kosina &lt;jkosina@suse.cz&gt;</td><td class='right'>2017-01-27 22:25:52 +0000</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2017-01-28 09:18:56 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/sh/siu_dai.c?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>bf29bddf0417a4783da3b24e8c9e017ac649326f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/soc/sh/siu_dai.c?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>54a05a4883b73f80e4e1d8c4b15750aa01c39932</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/sh/siu_dai.c?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>sound/soc/sh/siu_dai.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/sh/siu_dai.c?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>883af14e67e8b8702b5560aa64c888c0cd0bd66c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/sh/siu_dai.c?id=bf29bddf0417a4783da3b24e8c9e017ac649326f&amp;id2=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>diff</a>)</td></tr></table>
<div class='commit-subject'>x86/efi: Always map the first physical page into the EFI pagetables</div><div class='commit-msg'>Commit:

  129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode")

stopped creating 1:1 mappings for all RAM, when running in native 64-bit mode.

It turns out though that there are 64-bit EFI implementations in the wild
(this particular problem has been reported on a Lenovo Yoga 710-11IKB),
which still make use of the first physical page for their own private use,
even though they explicitly mark it EFI_CONVENTIONAL_MEMORY in the memory
map.

In case there is no mapping for this particular frame in the EFI pagetables,
as soon as firmware tries to make use of it, a triple fault occurs and the
system reboots (in case of the Yoga 710-11IKB this is very early during bootup).

Fix that by always mapping the first page of physical memory into the EFI
pagetables. We're free to hand this page to the BIOS, as trim_bios_range()
will reserve the first page and isolate it away from memory allocators anyway.

Note that just reverting 129766708 alone is not enough on v4.9-rc1+ to fix the
regression on affected hardware, as this commit:

   ab72a27da ("x86/efi: Consolidate region mapping logic")

later made the first physical frame not to be mapped anyway.

Reported-by: Hanka Pavlikova &lt;hanka@ucw.cz&gt;
Signed-off-by: Jiri Kosina &lt;jkosina@suse.cz&gt;
Signed-off-by: Matt Fleming &lt;matt@codeblueprint.co.uk&gt;
Cc: Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;
Cc: Borislav Petkov &lt;bp@alien8.de&gt;
Cc: Borislav Petkov &lt;bp@suse.de&gt;
Cc: Laura Abbott &lt;labbott@redhat.com&gt;
Cc: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Vojtech Pavlik &lt;vojtech@ucw.cz&gt;
Cc: Waiman Long &lt;waiman.long@hpe.com&gt;
Cc: linux-efi@vger.kernel.org
Cc: stable@kernel.org # v4.8+
Fixes: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode")
Link: http://lkml.kernel.org/r/20170127222552.22336-1-matt@codeblueprint.co.uk
[ Tidied up the changelog and the comment. ]
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>Diffstat</a> (limited to 'sound/soc/sh/siu_dai.c')</div><table summary='diffstat' class='diffstat'>