MIPS: cache: Provide cache flush operations for XFS
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/
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index b9aabb9..a79fe9a 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -722,6 +722,39 @@
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 @@
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;