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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/include/linux/io-mapping.h
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
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>
Diffstat (limited to 'kernel/include/linux/io-mapping.h')
-rw-r--r--kernel/include/linux/io-mapping.h170
1 files changed, 170 insertions, 0 deletions
diff --git a/kernel/include/linux/io-mapping.h b/kernel/include/linux/io-mapping.h
new file mode 100644
index 000000000..c27dde721
--- /dev/null
+++ b/kernel/include/linux/io-mapping.h
@@ -0,0 +1,170 @@
+/*
+ * Copyright © 2008 Keith Packard <keithp@keithp.com>
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * 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 St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef _LINUX_IO_MAPPING_H
+#define _LINUX_IO_MAPPING_H
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/bug.h>
+#include <asm/io.h>
+#include <asm/page.h>
+
+/*
+ * The io_mapping mechanism provides an abstraction for mapping
+ * individual pages from an io device to the CPU in an efficient fashion.
+ *
+ * See Documentation/io-mapping.txt
+ */
+
+#ifdef CONFIG_HAVE_ATOMIC_IOMAP
+
+#include <asm/iomap.h>
+
+struct io_mapping {
+ resource_size_t base;
+ unsigned long size;
+ pgprot_t prot;
+};
+
+/*
+ * For small address space machines, mapping large objects
+ * into the kernel virtual space isn't practical. Where
+ * available, use fixmap support to dynamically map pages
+ * of the object at run time.
+ */
+
+static inline struct io_mapping *
+io_mapping_create_wc(resource_size_t base, unsigned long size)
+{
+ struct io_mapping *iomap;
+ pgprot_t prot;
+
+ iomap = kmalloc(sizeof(*iomap), GFP_KERNEL);
+ if (!iomap)
+ goto out_err;
+
+ if (iomap_create_wc(base, size, &prot))
+ goto out_free;
+
+ iomap->base = base;
+ iomap->size = size;
+ iomap->prot = prot;
+ return iomap;
+
+out_free:
+ kfree(iomap);
+out_err:
+ return NULL;
+}
+
+static inline void
+io_mapping_free(struct io_mapping *mapping)
+{
+ iomap_free(mapping->base, mapping->size);
+ kfree(mapping);
+}
+
+/* Atomic map/unmap */
+static inline void __iomem *
+io_mapping_map_atomic_wc(struct io_mapping *mapping,
+ unsigned long offset)
+{
+ resource_size_t phys_addr;
+ unsigned long pfn;
+
+ BUG_ON(offset >= mapping->size);
+ phys_addr = mapping->base + offset;
+ pfn = (unsigned long) (phys_addr >> PAGE_SHIFT);
+ return iomap_atomic_prot_pfn(pfn, mapping->prot);
+}
+
+static inline void
+io_mapping_unmap_atomic(void __iomem *vaddr)
+{
+ iounmap_atomic(vaddr);
+}
+
+static inline void __iomem *
+io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
+{
+ resource_size_t phys_addr;
+
+ BUG_ON(offset >= mapping->size);
+ phys_addr = mapping->base + offset;
+
+ return ioremap_wc(phys_addr, PAGE_SIZE);
+}
+
+static inline void
+io_mapping_unmap(void __iomem *vaddr)
+{
+ iounmap(vaddr);
+}
+
+#else
+
+#include <linux/uaccess.h>
+
+/* this struct isn't actually defined anywhere */
+struct io_mapping;
+
+/* Create the io_mapping object*/
+static inline struct io_mapping *
+io_mapping_create_wc(resource_size_t base, unsigned long size)
+{
+ return (struct io_mapping __force *) ioremap_wc(base, size);
+}
+
+static inline void
+io_mapping_free(struct io_mapping *mapping)
+{
+ iounmap((void __force __iomem *) mapping);
+}
+
+/* Atomic map/unmap */
+static inline void __iomem *
+io_mapping_map_atomic_wc(struct io_mapping *mapping,
+ unsigned long offset)
+{
+ preempt_disable();
+ pagefault_disable();
+ return ((char __force __iomem *) mapping) + offset;
+}
+
+static inline void
+io_mapping_unmap_atomic(void __iomem *vaddr)
+{
+ pagefault_enable();
+ preempt_enable();
+}
+
+/* Non-atomic map/unmap */
+static inline void __iomem *
+io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
+{
+ return ((char __force __iomem *) mapping) + offset;
+}
+
+static inline void
+io_mapping_unmap(void __iomem *vaddr)
+{
+}
+
+#endif /* HAVE_ATOMIC_IOMAP */
+
+#endif /* _LINUX_IO_MAPPING_H */