Import ioat(4) driver

I/OAT is also referred to as Crystal Beach DMA and is a Platform Storage
Extension (PSE) on some Intel server platforms.

This driver currently supports DMA descriptors only and is part of a
larger effort to upstream an interconnect between multiple systems using
the Non-Transparent Bridge (NTB) PSE.

For now, this driver is only built on AMD64 platforms.  It may be ported
to work on i386 later, if that is desired.  The hardware is exclusive to
x86.

Further documentation on ioat(4), including API documentation and usage,
can be found in the new manual page.

Bring in a test tool, ioatcontrol(8), in tools/tools/ioat.  The test
tool is not hooked up to the build and is not intended for end users.

Submitted by:	jimharris, Carl Delsey <carl.r.delsey@intel.com>
Reviewed by:	jimharris (reviewed my changes)
Approved by:	markj (mentor)
Relnotes:	yes
Sponsored by:	Intel
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D3456

3 files changed, 153 insertions, 0 deletions

diff --git a/tools/tools/ioat/Makefile b/tools/tools/ioat/Makefile
new file mode 100644
index 000000000000..08acfe143ae1
--- /dev/null
+++ b/tools/tools/ioat/Makefile
@@ -0,0 +1,9 @@
+# $FreeBSD$
+
+PROG=	ioatcontrol
+SRCS=	ioatcontrol.c
+MAN=	ioatcontrol.8
+CFLAGS+=	-I${.CURDIR:H:H:H}/sys/dev/ioat
+WARNS?=	6
+
+.include <bsd.prog.mk>
diff --git a/tools/tools/ioat/ioatcontrol.8 b/tools/tools/ioat/ioatcontrol.8
new file mode 100644
index 000000000000..762ce14fc830
--- /dev/null
+++ b/tools/tools/ioat/ioatcontrol.8
@@ -0,0 +1,75 @@
+.\" Copyright (c) 2015 EMC / Isilon Storage Division
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 24, 2015
+.Dt IOATCONTROL 8
+.Os
+.Sh NAME
+.Nm ioatcontrol
+.Nd Userspace tool to test
+.Xr ioat 4
+.Sh SYNOPSIS
+.Nm
+.Ar channel_number
+.Ar num_loops
+.Sh DESCRIPTION
+.Nm
+allows one to issue some number of test operations to the
+.Xr ioat 4
+driver on a specific hardware channel.
+.Pp
+Each loop will allocate two chunks of memory, write data patterns to them,
+submit a DMA request to copy one buffer to the other, and compare the contents
+in the callback.
+If the contents are not as expected, an error is reported.
+.Sh FILES
+.Pa /dev/ioat_test
+.Pp
+The interface between
+.Nm
+and
+.Xr ioat 4 .
+.Nm
+exposes it with
+.Cd hw.ioat.enable_ioat_test=1 .
+.Sh SEE ALSO
+.Xr ioat 4
+.Sh HISTORY
+The
+.Xr ioat 4
+driver first appeared in
+.Fx 11.0 .
+.Sh AUTHORS
+The
+.Xr ioat 4
+driver and
+.Nm
+tool were developed by
+.An \&Jim Harris Aq Mt jimharris@FreeBSD.org ,
+and
+.An \&Carl Delsey Aq Mt carl.r.delsey@intel.com .
+This manual page was written by
+.An \&Conrad Meyer Aq Mt cem@FreeBSD.org .
diff --git a/tools/tools/ioat/ioatcontrol.c b/tools/tools/ioat/ioatcontrol.c
new file mode 100644
index 000000000000..c9c1a29c5d25
--- /dev/null
+++ b/tools/tools/ioat/ioatcontrol.c
@@ -0,0 +1,69 @@
+/*-
+ * Copyright (C) 2012 Intel Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+__FBSDID("$FreeBSD$");
+
+#include <sys/ioctl.h>
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+#include "ioat_test.h"
+
+int
+main(int argc, char **argv)
+{
+	struct ioat_test t;
+	int fd;
+
+	if (argc < 3) {
+		printf("Usage: %s <channel #> <num_loops>\n", argv[0]);
+		return (EX_USAGE);
+	}
+
+	t.channel_index = atoi(argv[1]);
+	if (t.channel_index > 8) {
+		printf("Channel number must be between 0 and 7.\n");
+		return (EX_USAGE);
+	}
+
+	t.num_loops = atoi(argv[2]);
+
+	fd = open("/dev/ioat_test", O_RDWR);
+	if (fd < 0) {
+		printf("Cannot open /dev/ioat_test\n");
+		return (EX_UNAVAILABLE);
+	}
+
+	(void)ioctl(fd, IOAT_DMATEST, &t);
+	close(fd);
+
+	return (t.status);
+}