diff options
Diffstat (limited to 'lib/raid6/algos.c')
-rw-r--r-- | lib/raid6/algos.c | 126 |
1 files changed, 87 insertions, 39 deletions
diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c index b595f56..589f5f5 100644 --- a/lib/raid6/algos.c +++ b/lib/raid6/algos.c @@ -21,6 +21,7 @@ #include <sys/mman.h> #include <stdio.h> #else +#include <linux/module.h> #include <linux/gfp.h> #if !RAID6_USE_EMPTY_ZERO_PAGE /* In .bss so it's zeroed */ @@ -33,10 +34,6 @@ struct raid6_calls raid6_call; EXPORT_SYMBOL_GPL(raid6_call); const struct raid6_calls * const raid6_algos[] = { - &raid6_intx1, - &raid6_intx2, - &raid6_intx4, - &raid6_intx8, #if defined(__ia64__) &raid6_intx16, &raid6_intx32, @@ -60,6 +57,24 @@ const struct raid6_calls * const raid6_algos[] = { &raid6_altivec4, &raid6_altivec8, #endif + &raid6_intx1, + &raid6_intx2, + &raid6_intx4, + &raid6_intx8, + 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 }; @@ -71,59 +86,55 @@ const struct raid6_calls * const raid6_algos[] = { #define time_before(x, y) ((x) < (y)) #endif -/* Try to pick the best algorithm */ -/* This code uses the gfmul table as convenient data set to abuse */ - -int __init raid6_select_algo(void) +static inline const struct raid6_recov_calls *raid6_choose_recov(void) { - const struct raid6_calls * const * algo; - const struct raid6_calls * best; - char *syndromes; - void *dptrs[(65536/PAGE_SIZE)+2]; - int i, disks; - unsigned long perf, bestperf; - int bestprefer; - unsigned long j0, j1; + const struct raid6_recov_calls *const *algo; + const struct raid6_recov_calls *best; - disks = (65536/PAGE_SIZE)+2; - for ( i = 0 ; i < disks-2 ; i++ ) { - dptrs[i] = ((char *)raid6_gfmul) + PAGE_SIZE*i; - } + for (best = NULL, algo = raid6_recov_algos; *algo; algo++) + if (!best || (*algo)->priority > best->priority) + if (!(*algo)->valid || (*algo)->valid()) + best = *algo; - /* Normal code - use a 2-page allocation to avoid D$ conflict */ - syndromes = (void *) __get_free_pages(GFP_KERNEL, 1); + if (best) { + raid6_2data_recov = best->data2; + raid6_datap_recov = best->datap; - if ( !syndromes ) { - printk("raid6: Yikes! No memory available.\n"); - return -ENOMEM; - } + printk("raid6: using %s recovery algorithm\n", best->name); + } else + printk("raid6: Yikes! No recovery algorithm found!\n"); - dptrs[disks-2] = syndromes; - dptrs[disks-1] = syndromes + PAGE_SIZE; + return best; +} + +static inline const struct raid6_calls *raid6_choose_gen( + void *(*const dptrs)[(65536/PAGE_SIZE)+2], const int disks) +{ + unsigned long perf, bestperf, j0, j1; + const struct raid6_calls *const *algo; + const struct raid6_calls *best; - bestperf = 0; bestprefer = 0; best = NULL; + for (bestperf = 0, best = NULL, algo = raid6_algos; *algo; algo++) { + if (!best || (*algo)->prefer >= best->prefer) { + if ((*algo)->valid && !(*algo)->valid()) + continue; - for ( algo = raid6_algos ; *algo ; algo++ ) { - if ( !(*algo)->valid || (*algo)->valid() ) { perf = 0; preempt_disable(); j0 = jiffies; - while ( (j1 = jiffies) == j0 ) + while ((j1 = jiffies) == j0) cpu_relax(); while (time_before(jiffies, j1 + (1<<RAID6_TIME_JIFFIES_LG2))) { - (*algo)->gen_syndrome(disks, PAGE_SIZE, dptrs); + (*algo)->gen_syndrome(disks, PAGE_SIZE, *dptrs); perf++; } preempt_enable(); - if ( (*algo)->prefer > bestprefer || - ((*algo)->prefer == bestprefer && - perf > bestperf) ) { - best = *algo; - bestprefer = best->prefer; + if (perf > bestperf) { bestperf = perf; + best = *algo; } printk("raid6: %-8s %5ld MB/s\n", (*algo)->name, (perf*HZ) >> (20-16+RAID6_TIME_JIFFIES_LG2)); @@ -138,9 +149,46 @@ int __init raid6_select_algo(void) } else printk("raid6: Yikes! No algorithm found!\n"); + return best; +} + + +/* Try to pick the best algorithm */ +/* This code uses the gfmul table as convenient data set to abuse */ + +int __init raid6_select_algo(void) +{ + const int disks = (65536/PAGE_SIZE)+2; + + const struct raid6_calls *gen_best; + const struct raid6_recov_calls *rec_best; + char *syndromes; + void *dptrs[(65536/PAGE_SIZE)+2]; + int i; + + for (i = 0; i < disks-2; i++) + dptrs[i] = ((char *)raid6_gfmul) + PAGE_SIZE*i; + + /* Normal code - use a 2-page allocation to avoid D$ conflict */ + syndromes = (void *) __get_free_pages(GFP_KERNEL, 1); + + if (!syndromes) { + printk("raid6: Yikes! No memory available.\n"); + return -ENOMEM; + } + + dptrs[disks-2] = syndromes; + dptrs[disks-1] = syndromes + PAGE_SIZE; + + /* select raid gen_syndrome function */ + gen_best = raid6_choose_gen(&dptrs, disks); + + /* select raid recover functions */ + rec_best = raid6_choose_recov(); + free_pages((unsigned long)syndromes, 1); - return best ? 0 : -EINVAL; + return gen_best && rec_best ? 0 : -EINVAL; } static void raid6_exit(void) |