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, 91 insertions, 0 deletions

diff --git a/kernel/arch/frv/mb93090-mb00/pci-dma.c b/kernel/arch/frv/mb93090-mb00/pci-dma.c
new file mode 100644
index 000000000..82478979a
--- /dev/null
+++ b/kernel/arch/frv/mb93090-mb00/pci-dma.c
@@ -0,0 +1,91 @@
+/* pci-dma.c: Dynamic DMA mapping support for the FRV CPUs that have MMUs
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.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.
+ */
+
+#include <linux/types.h>
+#include <linux/dma-mapping.h>
+#include <linux/list.h>
+#include <linux/pci.h>
+#include <linux/export.h>
+#include <linux/highmem.h>
+#include <linux/scatterlist.h>
+#include <asm/io.h>
+
+void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t gfp)
+{
+	void *ret;
+
+	ret = consistent_alloc(gfp, size, dma_handle);
+	if (ret)
+		memset(ret, 0, size);
+
+	return ret;
+}
+
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
+{
+	consistent_free(vaddr);
+}
+
+EXPORT_SYMBOL(dma_free_coherent);
+
+dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
+			  enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+
+	frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
+
+	return virt_to_bus(ptr);
+}
+
+EXPORT_SYMBOL(dma_map_single);
+
+int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+	       enum dma_data_direction direction)
+{
+	unsigned long dampr2;
+	void *vaddr;
+	int i;
+
+	BUG_ON(direction == DMA_NONE);
+
+	dampr2 = __get_DAMPR(2);
+
+	for (i = 0; i < nents; i++) {
+		vaddr = kmap_atomic_primary(sg_page(&sg[i]));
+
+		frv_dcache_writeback((unsigned long) vaddr,
+				     (unsigned long) vaddr + PAGE_SIZE);
+
+	}
+
+	kunmap_atomic_primary(vaddr);
+	if (dampr2) {
+		__set_DAMPR(2, dampr2);
+		__set_IAMPR(2, dampr2);
+	}
+
+	return nents;
+}
+
+EXPORT_SYMBOL(dma_map_sg);
+
+dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
+			size_t size, enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+	flush_dcache_page(page);
+	return (dma_addr_t) page_to_phys(page) + offset;
+}
+
+EXPORT_SYMBOL(dma_map_page);