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author | Oliver O'Halloran <oohall@gmail.com> | 2017-10-19 18:13:55 +1100 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-11-13 08:00:31 +1100 |
commit | 6c44741d75a27985a0496cd58b123a58c7177108 (patch) | |
tree | cabc19300cc31e282e8663bc071b37ab24187c00 /arch/powerpc/lib/pmem.c | |
parent | 32ce3862af3c42a3890e99846a8d1ad8871a49f9 (diff) | |
download | talos-obmc-linux-6c44741d75a27985a0496cd58b123a58c7177108.tar.gz talos-obmc-linux-6c44741d75a27985a0496cd58b123a58c7177108.zip |
powerpc/lib: Implement UACCESS_FLUSHCACHE API
Implement the architecture specific portitions of the UACCESS_FLUSHCACHE
API. This provides functions for the copy_user_flushcache iterator that
ensure that when the copy is finished the destination buffer contains
a copy of the original and that the destination buffer is clean in the
processor caches.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/lib/pmem.c')
-rw-r--r-- | arch/powerpc/lib/pmem.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/powerpc/lib/pmem.c b/arch/powerpc/lib/pmem.c index 0fa09262ca13..53c018762e1c 100644 --- a/arch/powerpc/lib/pmem.c +++ b/arch/powerpc/lib/pmem.c @@ -13,6 +13,7 @@ #include <linux/string.h> #include <linux/export.h> +#include <linux/uaccess.h> #include <asm/cacheflush.h> @@ -32,3 +33,35 @@ void arch_invalidate_pmem(void *addr, size_t size) flush_inval_dcache_range(start, start + size); } EXPORT_SYMBOL(arch_invalidate_pmem); + +/* + * CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols + */ +long __copy_from_user_flushcache(void *dest, const void __user *src, + unsigned size) +{ + unsigned long copied, start = (unsigned long) dest; + + copied = __copy_from_user(dest, src, size); + flush_inval_dcache_range(start, start + size); + + return copied; +} + +void *memcpy_flushcache(void *dest, const void *src, size_t size) +{ + unsigned long start = (unsigned long) dest; + + memcpy(dest, src, size); + flush_inval_dcache_range(start, start + size); + + return dest; +} +EXPORT_SYMBOL(memcpy_flushcache); + +void memcpy_page_flushcache(char *to, struct page *page, size_t offset, + size_t len) +{ + memcpy_flushcache(to, page_to_virt(page) + offset, len); +} +EXPORT_SYMBOL(memcpy_page_flushcache); |