Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 176 insertions, 0 deletions

diff --git a/crypto/xor.c b/crypto/xor.c
new file mode 100644
index 0000000000..8e72e5d5db
--- /dev/null
+++ b/crypto/xor.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * xor.c : Multiple Devices driver for Linux
+ *
+ * Copyright (C) 1996, 1997, 1998, 1999, 2000,
+ * Ingo Molnar, Matti Aarnio, Jakub Jelinek, Richard Henderson.
+ *
+ * Dispatch optimized RAID-5 checksumming functions.
+ */
+
+#define BH_TRACE 0
+#include <linux/module.h>
+#include <linux/gfp.h>
+#include <linux/raid/xor.h>
+#include <linux/jiffies.h>
+#include <linux/preempt.h>
+#include <asm/xor.h>
+
+#ifndef XOR_SELECT_TEMPLATE
+#define XOR_SELECT_TEMPLATE(x) (x)
+#endif
+
+/* The xor routines to use.  */
+static struct xor_block_template *active_template;
+
+void
+xor_blocks(unsigned int src_count, unsigned int bytes, void *dest, void **srcs)
+{
+	unsigned long *p1, *p2, *p3, *p4;
+
+	p1 = (unsigned long *) srcs[0];
+	if (src_count == 1) {
+		active_template->do_2(bytes, dest, p1);
+		return;
+	}
+
+	p2 = (unsigned long *) srcs[1];
+	if (src_count == 2) {
+		active_template->do_3(bytes, dest, p1, p2);
+		return;
+	}
+
+	p3 = (unsigned long *) srcs[2];
+	if (src_count == 3) {
+		active_template->do_4(bytes, dest, p1, p2, p3);
+		return;
+	}
+
+	p4 = (unsigned long *) srcs[3];
+	active_template->do_5(bytes, dest, p1, p2, p3, p4);
+}
+EXPORT_SYMBOL(xor_blocks);
+
+/* Set of all registered templates.  */
+static struct xor_block_template *__initdata template_list;
+
+#ifndef MODULE
+static void __init do_xor_register(struct xor_block_template *tmpl)
+{
+	tmpl->next = template_list;
+	template_list = tmpl;
+}
+
+static int __init register_xor_blocks(void)
+{
+	active_template = XOR_SELECT_TEMPLATE(NULL);
+
+	if (!active_template) {
+#define xor_speed	do_xor_register
+		// register all the templates and pick the first as the default
+		XOR_TRY_TEMPLATES;
+#undef xor_speed
+		active_template = template_list;
+	}
+	return 0;
+}
+#endif
+
+#define BENCH_SIZE	4096
+#define REPS		800U
+
+static void __init
+do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)
+{
+	int speed;
+	int i, j;
+	ktime_t min, start, diff;
+
+	tmpl->next = template_list;
+	template_list = tmpl;
+
+	preempt_disable();
+
+	min = (ktime_t)S64_MAX;
+	for (i = 0; i < 3; i++) {
+		start = ktime_get();
+		for (j = 0; j < REPS; j++) {
+			mb(); /* prevent loop optimization */
+			tmpl->do_2(BENCH_SIZE, b1, b2);
+			mb();
+		}
+		diff = ktime_sub(ktime_get(), start);
+		if (diff < min)
+			min = diff;
+	}
+
+	preempt_enable();
+
+	// bytes/ns == GB/s, multiply by 1000 to get MB/s [not MiB/s]
+	if (!min)
+		min = 1;
+	speed = (1000 * REPS * BENCH_SIZE) / (unsigned int)ktime_to_ns(min);
+	tmpl->speed = speed;
+
+	pr_info("   %-16s: %5d MB/sec\n", tmpl->name, speed);
+}
+
+static int __init
+calibrate_xor_blocks(void)
+{
+	void *b1, *b2;
+	struct xor_block_template *f, *fastest;
+
+	fastest = XOR_SELECT_TEMPLATE(NULL);
+
+	if (fastest) {
+		printk(KERN_INFO "xor: automatically using best "
+				 "checksumming function   %-10s\n",
+		       fastest->name);
+		goto out;
+	}
+
+	b1 = (void *) __get_free_pages(GFP_KERNEL, 2);
+	if (!b1) {
+		printk(KERN_WARNING "xor: Yikes!  No memory available.\n");
+		return -ENOMEM;
+	}
+	b2 = b1 + 2*PAGE_SIZE + BENCH_SIZE;
+
+	/*
+	 * If this arch/cpu has a short-circuited selection, don't loop through
+	 * all the possible functions, just test the best one
+	 */
+
+#define xor_speed(templ)	do_xor_speed((templ), b1, b2)
+
+	printk(KERN_INFO "xor: measuring software checksum speed\n");
+	template_list = NULL;
+	XOR_TRY_TEMPLATES;
+	fastest = template_list;
+	for (f = fastest; f; f = f->next)
+		if (f->speed > fastest->speed)
+			fastest = f;
+
+	pr_info("xor: using function: %s (%d MB/sec)\n",
+	       fastest->name, fastest->speed);
+
+#undef xor_speed
+
+	free_pages((unsigned long)b1, 2);
+out:
+	active_template = fastest;
+	return 0;
+}
+
+static __exit void xor_exit(void) { }
+
+MODULE_LICENSE("GPL");
+
+#ifndef MODULE
+/* when built-in xor.o must initialize before drivers/md/md.o */
+core_initcall(register_xor_blocks);
+#endif
+
+module_init(calibrate_xor_blocks);
+module_exit(xor_exit);