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diff --git a/drivers/scsi/esas2r/esas2r_log.h b/drivers/scsi/esas2r/esas2r_log.h
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+++ b/drivers/scsi/esas2r/esas2r_log.h
@@ -0,0 +1,118 @@
+/*
+ * linux/drivers/scsi/esas2r/esas2r_log.h
+ * For use with ATTO ExpressSAS R6xx SAS/SATA RAID controllers
+ *
+ * Copyright (c) 2001-2013 ATTO Technology, Inc.
+ * (mailto:linuxdrivers@attotech.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * NO WARRANTY
+ * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
+ * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
+ * solely responsible for determining the appropriateness of using and
+ * distributing the Program and assumes all risks associated with its
+ * exercise of rights under this Agreement, including but not limited to
+ * the risks and costs of program errors, damage to or loss of data,
+ * programs or equipment, and unavailability or interruption of operations.
+ *
+ * DISCLAIMER OF LIABILITY
+ * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), 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 OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
+ * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
+ */
+
+#ifndef __esas2r_log_h__
+#define __esas2r_log_h__
+
+struct device;
+
+enum {
+ ESAS2R_LOG_NONE = 0, /* no events logged */
+ ESAS2R_LOG_CRIT = 1, /* critical events */
+ ESAS2R_LOG_WARN = 2, /* warning events */
+ ESAS2R_LOG_INFO = 3, /* info events */
+ ESAS2R_LOG_DEBG = 4, /* debugging events */
+ ESAS2R_LOG_TRCE = 5, /* tracing events */
+
+#ifdef ESAS2R_TRACE
+ ESAS2R_LOG_DFLT = ESAS2R_LOG_TRCE
+#else
+ ESAS2R_LOG_DFLT = ESAS2R_LOG_WARN
+#endif
+};
+
+__printf(2, 3) int esas2r_log(const long level, const char *format, ...);
+__printf(3, 4) int esas2r_log_dev(const long level,
+ const struct device *dev,
+ const char *format,
+ ...);
+int esas2r_log_hexdump(const long level,
+ const void *buf,
+ size_t len);
+
+/*
+ * the following macros are provided specifically for debugging and tracing
+ * messages. esas2r_debug() is provided for generic non-hardware layer
+ * debugging and tracing events. esas2r_hdebug is provided specifically for
+ * hardware layer debugging and tracing events.
+ */
+
+#ifdef ESAS2R_DEBUG
+#define esas2r_debug(f, args ...) esas2r_log(ESAS2R_LOG_DEBG, f, ## args)
+#define esas2r_hdebug(f, args ...) esas2r_log(ESAS2R_LOG_DEBG, f, ## args)
+#else
+#define esas2r_debug(f, args ...)
+#define esas2r_hdebug(f, args ...)
+#endif /* ESAS2R_DEBUG */
+
+/*
+ * the following macros are provided in order to trace the driver and catch
+ * some more serious bugs. be warned, enabling these macros may *severely*
+ * impact performance.
+ */
+
+#ifdef ESAS2R_TRACE
+#define esas2r_bugon() \
+ do { \
+ esas2r_log(ESAS2R_LOG_TRCE, "esas2r_bugon() called in %s:%d" \
+ " - dumping stack and stopping kernel", __func__, \
+ __LINE__); \
+ dump_stack(); \
+ BUG(); \
+ } while (0)
+
+#define esas2r_trace_enter() esas2r_log(ESAS2R_LOG_TRCE, "entered %s (%s:%d)", \
+ __func__, __FILE__, __LINE__)
+#define esas2r_trace_exit() esas2r_log(ESAS2R_LOG_TRCE, "exited %s (%s:%d)", \
+ __func__, __FILE__, __LINE__)
+#define esas2r_trace(f, args ...) esas2r_log(ESAS2R_LOG_TRCE, "(%s:%s:%d): " \
+ f, __func__, __FILE__, __LINE__, \
+ ## args)
+#else
+#define esas2r_bugon()
+#define esas2r_trace_enter()
+#define esas2r_trace_exit()
+#define esas2r_trace(f, args ...)
+#endif /* ESAS2R_TRACE */
+
+#endif /* __esas2r_log_h__ */