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MIPS: cache: Provide cache flush operations for XFS

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Until now flush_kernel_vmap_range() and invalidate_kernel_vmap_range() did
not exist on MIPS resulting in heavy cache corruption on XFS filesystems.

Left for the post-3.0 time: optimization and make this work with highmem,
too.  Since the combination of highmem + cache aliases atm doesn't work
this isn't a regression.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/2505/
This commit is contained in:
Ralf Baechle
2011-06-17 16:20:28 +01:00
parent 2e5db86dd4
commit d9cdc901af
6 changed files with 84 additions and 0 deletions
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35
arch/mips/mm/c-r4k.c
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@@ -722,6 +722,39 @@ static void r4k_flush_icache_all(void)
r4k_blast_icache();
}
struct flush_kernel_vmap_range_args {
unsigned long vaddr;
int size;
};
static inline void local_r4k_flush_kernel_vmap_range(void *args)
{
struct flush_kernel_vmap_range_args *vmra = args;
unsigned long vaddr = vmra->vaddr;
int size = vmra->size;
/*
* Aliases only affect the primary caches so don't bother with
* S-caches or T-caches.
*/
if (cpu_has_safe_index_cacheops && size >= dcache_size)
r4k_blast_dcache();
else {
R4600_HIT_CACHEOP_WAR_IMPL;
blast_dcache_range(vaddr, vaddr + size);
}
}
static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size)
{
struct flush_kernel_vmap_range_args args;
args.vaddr = (unsigned long) vaddr;
args.size = size;
r4k_on_each_cpu(local_r4k_flush_kernel_vmap_range, &args);
}
static inline void rm7k_erratum31(void)
{
const unsigned long ic_lsize = 32;
@@ -1403,6 +1436,8 @@ void __cpuinit r4k_cache_init(void)
flush_cache_page = r4k_flush_cache_page;
flush_cache_range = r4k_flush_cache_range;
__flush_kernel_vmap_range = r4k_flush_kernel_vmap_range;
flush_cache_sigtramp = r4k_flush_cache_sigtramp;
flush_icache_all = r4k_flush_icache_all;
local_flush_data_cache_page = local_r4k_flush_data_cache_page;