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MIPS: Avoid destructive invalidation on partial cachelines. 

See discussion e9c3a7c20901051031y528d0d31r18d44c5096c59e0@mail.gmail.com.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2009-01-11 18:44:49 +00:00
parent 012703e0fc
commit a8ca8b64e3
1 changed files with 21 additions and 1 deletions
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22
arch/mips/mm/c-r4k.c
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@ -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);
}