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Subject[PATCH 01/22] Add powerpc-specific clear_cacheline(), which just compiles to "dcbz".
Date
From: Roland Dreier <rolandd@cisco.com>

This is horribly non-portable. How much of a performance difference
does it make? How does it do on ppc64 systems where the cacheline
size is not 32?
---

drivers/infiniband/hw/ehca/ehca_asm.h | 58 +++++++++++++++++++++++++++++++++
1 files changed, 58 insertions(+), 0 deletions(-)

diff --git a/drivers/infiniband/hw/ehca/ehca_asm.h b/drivers/infiniband/hw/ehca/ehca_asm.h
new file mode 100644
index 0000000..6a09ac5
--- /dev/null
+++ b/drivers/infiniband/hw/ehca/ehca_asm.h
@@ -0,0 +1,58 @@
+/*
+ * IBM eServer eHCA Infiniband device driver for Linux on POWER
+ *
+ * Some helper macros with assembler instructions
+ *
+ * Authors: Khadija Souissi <souissik@de.ibm.com>
+ * Christoph Raisch <raisch@de.ibm.com>
+ *
+ * Copyright (c) 2005 IBM Corporation
+ *
+ * All rights reserved.
+ *
+ * This source code is distributed under a dual license of GPL v2.0 and OpenIB
+ * BSD.
+ *
+ * OpenIB BSD License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ *
+ * $Id: ehca_asm.h,v 1.7 2006/02/06 10:17:34 schickhj Exp $
+ */
+
+
+#ifndef __EHCA_ASM_H__
+#define __EHCA_ASM_H__
+
+#if defined(CONFIG_PPC_PSERIES) || defined (__PPC64__) || defined (__PPC__)
+
+#define clear_cacheline(adr) __asm__ __volatile("dcbz 0,%0"::"r"(adr))
+
+#elif defined(CONFIG_ARCH_S390)
+#error "unsupported yet"
+#else
+#error "invalid platform"
+#endif
+
+#endif /* __EHCA_ASM_H__ */
-
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