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Diffstat (limited to 'lib/raid6/algos.c')
-rw-r--r--lib/raid6/algos.c127
1 files changed, 87 insertions, 40 deletions
diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c
index 8b02f60ffc86..589f5f50ad2e 100644
--- a/lib/raid6/algos.c
+++ b/lib/raid6/algos.c
@@ -17,11 +17,11 @@
*/
#include <linux/raid/pq.h>
-#include <linux/module.h>
#ifndef __KERNEL__
#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 */
@@ -34,10 +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,
@@ -61,6 +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
};
@@ -72,59 +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));
@@ -139,9 +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)