Merge tag 'for-5.17/drivers-2022-01-11' of git://git.kernel.dk/linux-block

Pull block driver updates from Jens Axboe:

 - mtip32xx pci cleanups (Bjorn)

 - mtip32xx conversion to generic power management (Vaibhav)

 - rsxx pci powermanagement cleanups (Bjorn)

 - Remove the rsxx driver. This hardware never saw much adoption, and
   it's been end of lifed for a while. (Christoph)

 - MD pull request from Song:
      - REQ_NOWAIT support (Vishal Verma)
      - raid6 benchmark optimization (Dirk Müller)
      - Fix for acct bioset (Xiao Ni)
      - Clean up max_queued_requests (Mariusz Tkaczyk)
      - PREEMPT_RT optimization (Davidlohr Bueso)
      - Use default_groups in kobj_type (Greg Kroah-Hartman)

 - Use attribute groups in pktcdvd and rnbd (Greg)

 - NVMe pull request from Christoph:
      - increment request genctr on completion (Keith Busch, Geliang
        Tang)
      - add a 'iopolicy' module parameter (Hannes Reinecke)
      - print out valid arguments when reading from /dev/nvme-fabrics
        (Hannes Reinecke)

 - Use struct_group() in drbd (Kees)

 - null_blk fixes (Ming)

 - Get rid of congestion logic in pktcdvd (Neil)

 - Floppy ejection hang fix (Tasos)

 - Floppy max user request size fix (Xiongwei)

 - Loop locking fix (Tetsuo)

* tag 'for-5.17/drivers-2022-01-11' of git://git.kernel.dk/linux-block: (32 commits)
  md: use default_groups in kobj_type
  md: Move alloc/free acct bioset in to personality
  lib/raid6: Use strict priority ranking for pq gen() benchmarking
  lib/raid6: skip benchmark of non-chosen xor_syndrome functions
  md: fix spelling of "its"
  md: raid456 add nowait support
  md: raid10 add nowait support
  md: raid1 add nowait support
  md: add support for REQ_NOWAIT
  md: drop queue limitation for RAID1 and RAID10
  md/raid5: play nice with PREEMPT_RT
  block/rnbd-clt-sysfs: use default_groups in kobj_type
  pktcdvd: convert to use attribute groups
  block: null_blk: only set set->nr_maps as 3 if active poll_queues is > 0
  nvme: add 'iopolicy' module parameter
  nvme: drop unused variable ctrl in nvme_setup_cmd
  nvme: increment request genctr on completion
  nvme-fabrics: print out valid arguments when reading from /dev/nvme-fabrics
  block: remove the rsxx driver
  rsxx: Drop PCI legacy power management
  ...

lib/raid6/algos.c

@@ -145,13 +145,13 @@ static inline const struct raid6_recov_calls *raid6_choose_recov(void)
 static inline const struct raid6_calls *raid6_choose_gen(
 	void *(*const dptrs)[RAID6_TEST_DISKS], const int disks)
 {
-	unsigned long perf, bestgenperf, bestxorperf, j0, j1;
+	unsigned long perf, bestgenperf, j0, j1;
 	int start = (disks>>1)-1, stop = disks-3;	/* work on the second half of the disks */
 	const struct raid6_calls *const *algo;
 	const struct raid6_calls *best;
 
-	for (bestgenperf = 0, bestxorperf = 0, best = NULL, algo = raid6_algos; *algo; algo++) {
-		if (!best || (*algo)->prefer >= best->prefer) {
+	for (bestgenperf = 0, best = NULL, algo = raid6_algos; *algo; algo++) {
+		if (!best || (*algo)->priority >= best->priority) {
 			if ((*algo)->valid && !(*algo)->valid())
 				continue;
 
@@ -180,50 +180,48 @@ static inline const struct raid6_calls *raid6_choose_gen(
 			pr_info("raid6: %-8s gen() %5ld MB/s\n", (*algo)->name,
 				(perf * HZ * (disks-2)) >>
 				(20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2));
-
-			if (!(*algo)->xor_syndrome)
-				continue;
-
-			perf = 0;
-
-			preempt_disable();
-			j0 = jiffies;
-			while ((j1 = jiffies) == j0)
-				cpu_relax();
-			while (time_before(jiffies,
-					    j1 + (1<<RAID6_TIME_JIFFIES_LG2))) {
-				(*algo)->xor_syndrome(disks, start, stop,
-						      PAGE_SIZE, *dptrs);
-				perf++;
-			}
-			preempt_enable();
-
-			if (best == *algo)
-				bestxorperf = perf;
-
-			pr_info("raid6: %-8s xor() %5ld MB/s\n", (*algo)->name,
-				(perf * HZ * (disks-2)) >>
-				(20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2 + 1));
 		}
 	}
 
-	if (best) {
-		if (IS_ENABLED(CONFIG_RAID6_PQ_BENCHMARK)) {
-			pr_info("raid6: using algorithm %s gen() %ld MB/s\n",
-				best->name,
-				(bestgenperf * HZ * (disks-2)) >>
-				(20 - PAGE_SHIFT+RAID6_TIME_JIFFIES_LG2));
-			if (best->xor_syndrome)
-				pr_info("raid6: .... xor() %ld MB/s, rmw enabled\n",
-					(bestxorperf * HZ * (disks-2)) >>
-					(20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2 + 1));
-		} else
-			pr_info("raid6: skip pq benchmark and using algorithm %s\n",
-				best->name);
-		raid6_call = *best;
-	} else
-		pr_err("raid6: Yikes!  No algorithm found!\n");
+	if (!best) {
+		pr_err("raid6: Yikes! No algorithm found!\n");
+		goto out;
+	}
 
+	raid6_call = *best;
+
+	if (!IS_ENABLED(CONFIG_RAID6_PQ_BENCHMARK)) {
+		pr_info("raid6: skipped pq benchmark and selected %s\n",
+			best->name);
+		goto out;
+	}
+
+	pr_info("raid6: using algorithm %s gen() %ld MB/s\n",
+		best->name,
+		(bestgenperf * HZ * (disks - 2)) >>
+		(20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2));
+
+	if (best->xor_syndrome) {
+		perf = 0;
+
+		preempt_disable();
+		j0 = jiffies;
+		while ((j1 = jiffies) == j0)
+			cpu_relax();
+		while (time_before(jiffies,
+				   j1 + (1 << RAID6_TIME_JIFFIES_LG2))) {
+			best->xor_syndrome(disks, start, stop,
+					   PAGE_SIZE, *dptrs);
+			perf++;
+		}
+		preempt_enable();
+
+		pr_info("raid6: .... xor() %ld MB/s, rmw enabled\n",
+			(perf * HZ * (disks - 2)) >>
+			(20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2 + 1));
+	}
+
+out:
 	return best;
 }
 

lib/raid6/avx2.c

@@ -132,7 +132,7 @@ const struct raid6_calls raid6_avx2x1 = {
 	raid6_avx21_xor_syndrome,
 	raid6_have_avx2,
 	"avx2x1",
-	1			/* Has cache hints */
+	.priority = 2		/* Prefer AVX2 over priority 1 (SSE2 and others) */
 };
 
 /*
@@ -262,7 +262,7 @@ const struct raid6_calls raid6_avx2x2 = {
 	raid6_avx22_xor_syndrome,
 	raid6_have_avx2,
 	"avx2x2",
-	1			/* Has cache hints */
+	.priority = 2		/* Prefer AVX2 over priority 1 (SSE2 and others) */
 };
 
 #ifdef CONFIG_X86_64
@@ -465,6 +465,6 @@ const struct raid6_calls raid6_avx2x4 = {
 	raid6_avx24_xor_syndrome,
 	raid6_have_avx2,
 	"avx2x4",
-	1			/* Has cache hints */
+	.priority = 2		/* Prefer AVX2 over priority 1 (SSE2 and others) */
 };
-#endif
+#endif /* CONFIG_X86_64 */

lib/raid6/avx512.c

@@ -162,7 +162,7 @@ const struct raid6_calls raid6_avx512x1 = {
 	raid6_avx5121_xor_syndrome,
 	raid6_have_avx512,
 	"avx512x1",
-	1                       /* Has cache hints */
+	.priority = 2		/* Prefer AVX512 over priority 1 (SSE2 and others) */
 };
 
 /*
@@ -319,7 +319,7 @@ const struct raid6_calls raid6_avx512x2 = {
 	raid6_avx5122_xor_syndrome,
 	raid6_have_avx512,
 	"avx512x2",
-	1                       /* Has cache hints */
+	.priority = 2		/* Prefer AVX512 over priority 1 (SSE2 and others) */
 };
 
 #ifdef CONFIG_X86_64
@@ -557,7 +557,7 @@ const struct raid6_calls raid6_avx512x4 = {
 	raid6_avx5124_xor_syndrome,
 	raid6_have_avx512,
 	"avx512x4",
-	1                       /* Has cache hints */
+	.priority = 2		/* Prefer AVX512 over priority 1 (SSE2 and others) */
 };
 #endif