Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/kernel/arch/mips/include/asm/mach-loongson/dma-coherence.h b/kernel/arch/mips/include/asm/mach-loongson/dma-coherence.h
new file mode 100644
index 000000000..4bf4e19f7
--- /dev/null
+++ b/kernel/arch/mips/include/asm/mach-loongson/dma-coherence.h
@@ -0,0 +1,85 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2006, 07  Ralf Baechle <ralf@linux-mips.org>
+ * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
+ * Author: Fuxin Zhang, zhangfx@lemote.com
+ *
+ */
+#ifndef __ASM_MACH_LOONGSON_DMA_COHERENCE_H
+#define __ASM_MACH_LOONGSON_DMA_COHERENCE_H
+
+#ifdef CONFIG_SWIOTLB
+#include <linux/swiotlb.h>
+#endif
+
+struct device;
+
+extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
+extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
+static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
+					  size_t size)
+{
+#ifdef CONFIG_CPU_LOONGSON3
+	return phys_to_dma(dev, virt_to_phys(addr));
+#else
+	return virt_to_phys(addr) | 0x80000000;
+#endif
+}
+
+static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
+					       struct page *page)
+{
+#ifdef CONFIG_CPU_LOONGSON3
+	return phys_to_dma(dev, page_to_phys(page));
+#else
+	return page_to_phys(page) | 0x80000000;
+#endif
+}
+
+static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
+	dma_addr_t dma_addr)
+{
+#if defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_64BIT)
+	return dma_to_phys(dev, dma_addr);
+#elif defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
+	return (dma_addr > 0x8fffffff) ? dma_addr : (dma_addr & 0x0fffffff);
+#else
+	return dma_addr & 0x7fffffff;
+#endif
+}
+
+static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
+	size_t size, enum dma_data_direction direction)
+{
+}
+
+static inline int plat_dma_supported(struct device *dev, u64 mask)
+{
+	/*
+	 * we fall back to GFP_DMA when the mask isn't all 1s,
+	 * so we can't guarantee allocations that must be
+	 * within a tighter range than GFP_DMA..
+	 */
+	if (mask < DMA_BIT_MASK(24))
+		return 0;
+
+	return 1;
+}
+
+static inline int plat_device_is_coherent(struct device *dev)
+{
+#ifdef CONFIG_DMA_NONCOHERENT
+	return 0;
+#else
+	return 1;
+#endif /* CONFIG_DMA_NONCOHERENT */
+}
+
+static inline void plat_post_dma_flush(struct device *dev)
+{
+}
+
+#endif /* __ASM_MACH_LOONGSON_DMA_COHERENCE_H */