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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/arch/tile/include/asm/cacheflush.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/arch/tile/include/asm/cacheflush.h')
-rw-r--r-- | kernel/arch/tile/include/asm/cacheflush.h | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/kernel/arch/tile/include/asm/cacheflush.h b/kernel/arch/tile/include/asm/cacheflush.h new file mode 100644 index 000000000..92ee4c8a4 --- /dev/null +++ b/kernel/arch/tile/include/asm/cacheflush.h @@ -0,0 +1,160 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * 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, version 2. + * + * 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, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#ifndef _ASM_TILE_CACHEFLUSH_H +#define _ASM_TILE_CACHEFLUSH_H + +#include <arch/chip.h> + +/* Keep includes the same across arches. */ +#include <linux/mm.h> +#include <linux/cache.h> +#include <arch/icache.h> + +/* Caches are physically-indexed and so don't need special treatment */ +#define flush_cache_all() do { } while (0) +#define flush_cache_mm(mm) do { } while (0) +#define flush_cache_dup_mm(mm) do { } while (0) +#define flush_cache_range(vma, start, end) do { } while (0) +#define flush_cache_page(vma, vmaddr, pfn) do { } while (0) +#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 +#define flush_dcache_page(page) do { } while (0) +#define flush_dcache_mmap_lock(mapping) do { } while (0) +#define flush_dcache_mmap_unlock(mapping) do { } while (0) +#define flush_cache_vmap(start, end) do { } while (0) +#define flush_cache_vunmap(start, end) do { } while (0) +#define flush_icache_page(vma, pg) do { } while (0) +#define flush_icache_user_range(vma, pg, adr, len) do { } while (0) + +/* Flush the icache just on this cpu */ +extern void __flush_icache_range(unsigned long start, unsigned long end); + +/* Flush the entire icache on this cpu. */ +#define __flush_icache() __flush_icache_range(0, CHIP_L1I_CACHE_SIZE()) + +#ifdef CONFIG_SMP +/* + * When the kernel writes to its own text we need to do an SMP + * broadcast to make the L1I coherent everywhere. This includes + * module load and single step. + */ +extern void flush_icache_range(unsigned long start, unsigned long end); +#else +#define flush_icache_range __flush_icache_range +#endif + +/* + * An update to an executable user page requires icache flushing. + * We could carefully update only tiles that are running this process, + * and rely on the fact that we flush the icache on every context + * switch to avoid doing extra work here. But for now, I'll be + * conservative and just do a global icache flush. + */ +static inline void copy_to_user_page(struct vm_area_struct *vma, + struct page *page, unsigned long vaddr, + void *dst, void *src, int len) +{ + memcpy(dst, src, len); + if (vma->vm_flags & VM_EXEC) { + flush_icache_range((unsigned long) dst, + (unsigned long) dst + len); + } +} + +#define copy_from_user_page(vma, page, vaddr, dst, src, len) \ + memcpy((dst), (src), (len)) + +/* Flush a VA range; pads to L2 cacheline boundaries. */ +static inline void __flush_buffer(void *buffer, size_t size) +{ + char *next = (char *)((long)buffer & -L2_CACHE_BYTES); + char *finish = (char *)L2_CACHE_ALIGN((long)buffer + size); + while (next < finish) { + __insn_flush(next); + next += CHIP_FLUSH_STRIDE(); + } +} + +/* Flush & invalidate a VA range; pads to L2 cacheline boundaries. */ +static inline void __finv_buffer(void *buffer, size_t size) +{ + char *next = (char *)((long)buffer & -L2_CACHE_BYTES); + char *finish = (char *)L2_CACHE_ALIGN((long)buffer + size); + while (next < finish) { + __insn_finv(next); + next += CHIP_FINV_STRIDE(); + } +} + + +/* + * Flush a locally-homecached VA range and wait for the evicted + * cachelines to hit memory. + */ +static inline void flush_buffer_local(void *buffer, size_t size) +{ + __flush_buffer(buffer, size); + mb_incoherent(); +} + +/* + * Flush and invalidate a locally-homecached VA range and wait for the + * evicted cachelines to hit memory. + */ +static inline void finv_buffer_local(void *buffer, size_t size) +{ + __finv_buffer(buffer, size); + mb_incoherent(); +} + +#ifdef __tilepro__ +/* Invalidate a VA range; pads to L2 cacheline boundaries. */ +static inline void __inv_buffer(void *buffer, size_t size) +{ + char *next = (char *)((long)buffer & -L2_CACHE_BYTES); + char *finish = (char *)L2_CACHE_ALIGN((long)buffer + size); + while (next < finish) { + __insn_inv(next); + next += CHIP_INV_STRIDE(); + } +} + +/* Invalidate a VA range and wait for it to be complete. */ +static inline void inv_buffer(void *buffer, size_t size) +{ + __inv_buffer(buffer, size); + mb(); +} +#endif + +/* + * Flush and invalidate a VA range that is homed remotely, waiting + * until the memory controller holds the flushed values. If "hfh" is + * true, we will do a more expensive flush involving additional loads + * to make sure we have touched all the possible home cpus of a buffer + * that is homed with "hash for home". + */ +void finv_buffer_remote(void *buffer, size_t size, int hfh); + +/* + * On SMP systems, when the scheduler does migration-cost autodetection, + * it needs a way to flush as much of the CPU's caches as possible: + * + * TODO: fill this in! + */ +static inline void sched_cacheflush(void) +{ +} + +#endif /* _ASM_TILE_CACHEFLUSH_H */ |