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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/include/linux/io-mapping.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (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.h | 170 |
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 */ |