#ifndef __ASM_GENERIC_STAT_H
#define __ASM_GENERIC_STAT_H

/*
 * Everybody gets this wrong and has to stick with it for all
 * eternity. Hopefully, this version gets used by new architectures
 * so they don't fall into the same traps.
 *
 * stat64 is copied from powerpc64, with explicit padding added.
 * stat is the same structure layout on 64-bit, without the 'long long'
 * types.
 *
 * By convention, 64 bit architectures use the stat interface, while
 * 32 bit architectures use the stat64 interface. Note that we don't
 * provide an __old_kernel_stat here, which new architecture should
 * not have to start with.
 */

#include <asm/bitsperlong.h>

#define STAT_HAVE_NSEC 1

struct stat {
	unsigned long	st_dev;		/* Device.  */
	unsigned long	st_ino;		/* File serial number.  */
	unsigned int	st_mode;	/* File mode.  */
	unsigned int	st_nlink;	/* Link count.  */
	unsigned int	st_uid;		/* User ID of the file's owner.  */
	unsigned int	st_gid;		/* Group ID of the file's group. */
	unsigned long	st_rdev;	/* Device number, if device.  */
	unsigned long	__pad1;
	long		st_size;	/* Size of file, in bytes.  */
	int		st_blksize;	/* Optimal block size for I/O.  */
	int		__pad2;
	long		st_blocks;	/* Number 512-byte blocks allocated. */
	long		st_atime;	/* Time of last access.  */
	unsigned long	st_atime_nsec;
	long		st_mtime;	/* Time of last modification.  */
	unsigned long	st_mtime_nsec;
	long		st_ctime;	/* Time of last status change.  */
	unsigned long	st_ctime_nsec;
	unsigned int	__unused4;
	unsigned int	__unused5;
};

/* This matches struct stat64 in glibc2.1. Only used for 32 bit. */
#if __BITS_PER_LONG != 64 || defined(__ARCH_WANT_STAT64)
struct stat64 {
	unsigned long long st_dev;	/* Device.  */
	unsigned long long st_ino;	/* File serial number.  */
	unsigned int	st_mode;	/* File mode.  */
	unsigned int	st_nlink;	/* Link count.  */
	unsigned int	st_uid;		/* User ID of the file's owner.  */
	unsigned int	st_gid;		/* Group ID of the file's group. */
	unsigned long long st_rdev;	/* Device number, if device.  */
	unsigned long long __pad1;
	long long	st_size;	/* Size of file, in bytes.  */
	int		st_blksize;	/* Optimal block size for I/O.  */
	int		__pad2;
	long long	st_blocks;	/* Number 512-byte blocks allocated. */
	int		st_atime;	/* Time of last access.  */
	unsigned int	st_atime_nsec;
	int		st_mtime;	/* Time of last modification.  */
	unsigned int	st_mtime_nsec;
	int		st_ctime;	/* Time of last status change.  */
	unsigned int	st_ctime_nsec;
	unsigned int	__unused4;
	unsigned int	__unused5;
};
#endif

#endif /* __ASM_GENERIC_STAT_H */
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=8ef4227615e158faa4ee85a1d6466782f7e22f2f'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=8ef4227615e158faa4ee85a1d6466782f7e22f2f'>Documentation</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation/virtual?id=8ef4227615e158faa4ee85a1d6466782f7e22f2f'>virtual</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation/virtual/kvm?id=8ef4227615e158faa4ee85a1d6466782f7e22f2f'>kvm</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='8ef4227615e158faa4ee85a1d6466782f7e22f2f'/><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>Dave Airlie &lt;airlied@redhat.com&gt;</td><td class='right'>2016-10-24 15:27:59 +1000</td></tr>
<tr><th>committer</th><td>Dave Airlie &lt;airlied@redhat.com&gt;</td><td class='right'>2016-10-26 15:45:38 +1000</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/virtual/kvm?id=8ef4227615e158faa4ee85a1d6466782f7e22f2f'>8ef4227615e158faa4ee85a1d6466782f7e22f2f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation/virtual/kvm?id=8ef4227615e158faa4ee85a1d6466782f7e22f2f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=8ef4227615e158faa4ee85a1d6466782f7e22f2f'>b5f5ef11dd409790679bf53daf6ba3ed586082e2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation/virtual/kvm?id=8ef4227615e158faa4ee85a1d6466782f7e22f2f'>Documentation/virtual/kvm</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/virtual/kvm?id=07d9a380680d1c0eb51ef87ff2eab5c994949e69'>07d9a380680d1c0eb51ef87ff2eab5c994949e69</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation/virtual/kvm?id=8ef4227615e158faa4ee85a1d6466782f7e22f2f&amp;id2=07d9a380680d1c0eb51ef87ff2eab5c994949e69'>diff</a>)</td></tr></table>
<div class='commit-subject'>x86/io: add interface to reserve io memtype for a resource range. (v1.1)</div><div class='commit-msg'>A recent change to the mm code in:
87744ab3832b mm: fix cache mode tracking in vm_insert_mixed()

started enforcing checking the memory type against the registered list for
amixed pfn insertion mappings. It happens that the drm drivers for a number
of gpus relied on this being broken. Currently the driver only inserted
VRAM mappings into the tracking table when they came from the kernel,
and userspace mappings never landed in the table. This led to a regression
where all the mapping end up as UC instead of WC now.

I've considered a number of solutions but since this needs to be fixed
in fixes and not next, and some of the solutions were going to introduce
overhead that hadn't been there before I didn't consider them viable at
this stage. These mainly concerned hooking into the TTM io reserve APIs,
but these API have a bunch of fast paths I didn't want to unwind to add
this to.

The solution I've decided on is to add a new API like the arch_phys_wc
APIs (these would have worked but wc_del didn't take a range), and
use them from the drivers to add a WC compatible mapping to the table
for all VRAM on those GPUs. This means we can then create userspace
mapping that won't get degraded to UC.

v1.1: use CONFIG_X86_PAT + add some comments in io.h

Cc: Toshi Kani &lt;toshi.kani@hp.com&gt;
Cc: Borislav Petkov &lt;bp@alien8.de&gt;
Cc: H. Peter Anvin &lt;hpa@zytor.com&gt;
Cc: Andy Lutomirski &lt;luto@kernel.org&gt;
Cc: Denys Vlasenko &lt;dvlasenk@redhat.com&gt;
Cc: Brian Gerst &lt;brgerst@gmail.com&gt;
Cc: x86@kernel.org
Cc: mcgrof@suse.com
Cc: Dan Williams &lt;dan.j.williams@intel.com&gt;
Acked-by: Ingo Molnar &lt;mingo@kernel.org&gt;
Reviewed-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Signed-off-by: Dave Airlie &lt;airlied@redhat.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=8ef4227615e158faa4ee85a1d6466782f7e22f2f'>Diffstat</a> (limited to 'Documentation/virtual/kvm')</div><table summary='diffstat' class='diffstat'>