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lib/raid6: Add SSSE3 optimized recovery functions

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Add SSSE3 optimized recovery functions, as well as a system
for selecting the most appropriate recovery functions to use.

Originally-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Jim Kukunas
2012-05-22 13:54:18 +10:00
committed by NeilBrown
parent f674ef7b43
commit 048a8b8c89
6 changed files with 425 additions and 7 deletions
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37
lib/raid6/algos.c
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@@ -64,6 +64,20 @@ const struct raid6_calls * const raid6_algos[] = {
NULL
};
void (*raid6_2data_recov)(int, size_t, int, int, void **);
EXPORT_SYMBOL_GPL(raid6_2data_recov);
void (*raid6_datap_recov)(int, size_t, int, void **);
EXPORT_SYMBOL_GPL(raid6_datap_recov);
const struct raid6_recov_calls *const raid6_recov_algos[] = {
#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
&raid6_recov_ssse3,
#endif
&raid6_recov_intx1,
NULL
};
#ifdef __KERNEL__
#define RAID6_TIME_JIFFIES_LG2 4
#else
@@ -72,6 +86,26 @@ const struct raid6_calls * const raid6_algos[] = {
#define time_before(x, y) ((x) < (y))
#endif
static inline void raid6_choose_recov(void)
{
const struct raid6_recov_calls *const *algo;
const struct raid6_recov_calls *best;
for (best = NULL, algo = raid6_recov_algos; *algo; algo++)
if (!best || (*algo)->priority > best->priority)
if (!(*algo)->valid || (*algo)->valid())
best = *algo;
if (best) {
raid6_2data_recov = best->data2;
raid6_datap_recov = best->datap;
printk("raid6: using %s recovery algorithm\n", best->name);
} else
printk("raid6: Yikes! No recovery algorithm found!\n");
}
/* Try to pick the best algorithm */
/* This code uses the gfmul table as convenient data set to abuse */
@@ -141,6 +175,9 @@ int __init raid6_select_algo(void)
free_pages((unsigned long)syndromes, 1);
/* select raid recover functions */
raid6_choose_recov();
return best ? 0 : -EINVAL;
}