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MIPS: Remove cpu_has_safe_index_cacheops 

Very early versions of the 1004K had an hardware issue that made index
cache ops unsafe so they had to be avoided and hit ops be used instead.
This may significantly slow down cache maintenance operations.  Only
very early FPGA versions of the 1004K were affected so let's get rid
of the workaround which was only implemented for the DMA cache
maintenance operations anyway.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
hifive-unleashed-5.1
Ralf Baechle 2016-07-02 10:38:05 +02:00
parent c683ffe219
commit c00ab4896e
1 changed files with 3 additions and 9 deletions
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12
arch/mips/mm/c-r4k.c
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@ -66,12 +66,6 @@ static inline void r4k_on_each_cpu(void (*func) (void *info), void *info)
preempt_enable();
}
#if defined(CONFIG_MIPS_CMP) || defined(CONFIG_MIPS_CPS)
#define cpu_has_safe_index_cacheops 0
#else
#define cpu_has_safe_index_cacheops 1
#endif
/*
* Must die.
*/
@ -744,7 +738,7 @@ static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
* subset property so we have to flush the primary caches
* explicitly
*/
if (cpu_has_safe_index_cacheops && size >= dcache_size) {
if (size >= dcache_size) {
r4k_blast_dcache();
} else {
R4600_HIT_CACHEOP_WAR_IMPL;
@ -781,7 +775,7 @@ static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
return;
}
if (cpu_has_safe_index_cacheops && size >= dcache_size) {
if (size >= dcache_size) {
r4k_blast_dcache();
} else {
R4600_HIT_CACHEOP_WAR_IMPL;
@ -861,7 +855,7 @@ static inline void local_r4k_flush_kernel_vmap_range(void *args)
* 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)
if (size >= dcache_size)
r4k_blast_dcache();
else {
R4600_HIT_CACHEOP_WAR_IMPL;