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authorRalf Baechle <ralf@linux-mips.org>2009-01-11 18:44:49 +0000
committerRalf Baechle <ralf@linux-mips.org>2009-01-30 21:32:57 +0000
commita8ca8b64e3fdfec17679cba0ca5ce6e3ffed092d (patch)
treebdb505a02de52a85483c2cc049350c8d14f2d806 /arch/mips
parent012703e0fc9fb1d6cdf778c49f45b796a85ef5bc (diff)
downloadlinux-a8ca8b64e3fdfec17679cba0ca5ce6e3ffed092d.tar.bz2
MIPS: Avoid destructive invalidation on partial cachelines.
See discussion e9c3a7c20901051031y528d0d31r18d44c5096c59e0@mail.gmail.com. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/mm/c-r4k.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 6e99665ae860..c43f4b26a690 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -618,15 +618,35 @@ static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
if (cpu_has_inclusive_pcaches) {
if (size >= scache_size)
r4k_blast_scache();
- else
+ else {
+ unsigned long lsize = cpu_scache_line_size();
+ unsigned long almask = ~(lsize - 1);
+
+ /*
+ * There is no clearly documented alignment requirement
+ * for the cache instruction on MIPS processors and
+ * some processors, among them the RM5200 and RM7000
+ * QED processors will throw an address error for cache
+ * hit ops with insufficient alignment. Solved by
+ * aligning the address to cache line size.
+ */
+ cache_op(Hit_Writeback_Inv_SD, addr & almask);
+ cache_op(Hit_Writeback_Inv_SD,
+ (addr + size - 1) & almask);
blast_inv_scache_range(addr, addr + size);
+ }
return;
}
if (cpu_has_safe_index_cacheops && size >= dcache_size) {
r4k_blast_dcache();
} else {
+ unsigned long lsize = cpu_dcache_line_size();
+ unsigned long almask = ~(lsize - 1);
+
R4600_HIT_CACHEOP_WAR_IMPL;
+ cache_op(Hit_Writeback_Inv_D, addr & almask);
+ cache_op(Hit_Writeback_Inv_D, (addr + size - 1) & almask);
blast_inv_dcache_range(addr, addr + size);
}