add wifi6 8852be driver

hc

2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/kernel/panic.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  *  linux/kernel/panic.c
3
4
  *
..
..
@@ -11,6 +12,7 @@
11
12
 #include <linux/debug_locks.h>
12
13
 #include <linux/sched/debug.h>
13
14
 #include <linux/interrupt.h>
15
+#include <linux/kgdb.h>
14
16
 #include <linux/kmsg_dump.h>
15
17
 #include <linux/kallsyms.h>
16
18
 #include <linux/notifier.h>
..
..
@@ -29,10 +31,21 @@
29
31
 #include <linux/bug.h>
30
32
 #include <linux/ratelimit.h>
31
33
 #include <linux/debugfs.h>
34
+#include <linux/sysfs.h>
32
35
 #include <asm/sections.h>
33
36
 
34
37
 #define PANIC_TIMER_STEP 100
35
38
 #define PANIC_BLINK_SPD 18
39
+
40
+#ifdef CONFIG_SMP
41
+/*
42
+ * Should we dump all CPUs backtraces in an oops event?
43
+ * Defaults to 0, can be changed via sysctl.
44
+ */
45
+static unsigned int __read_mostly sysctl_oops_all_cpu_backtrace;
46
+#else
47
+#define sysctl_oops_all_cpu_backtrace 0
48
+#endif /* CONFIG_SMP */
36
49
 
37
50
 int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
38
51
 static unsigned long tainted_mask =
..
..
@@ -42,15 +55,74 @@
42
55
 static DEFINE_SPINLOCK(pause_on_oops_lock);
43
56
 bool crash_kexec_post_notifiers;
44
57
 int panic_on_warn __read_mostly;
58
+unsigned long panic_on_taint;
59
+bool panic_on_taint_nousertaint = false;
60
+static unsigned int warn_limit __read_mostly;
45
61
 
46
62
 int panic_timeout = CONFIG_PANIC_TIMEOUT;
47
63
 EXPORT_SYMBOL_GPL(panic_timeout);
48
64
 
65
+#define PANIC_PRINT_TASK_INFO		0x00000001
66
+#define PANIC_PRINT_MEM_INFO		0x00000002
67
+#define PANIC_PRINT_TIMER_INFO		0x00000004
68
+#define PANIC_PRINT_LOCK_INFO		0x00000008
69
+#define PANIC_PRINT_FTRACE_INFO		0x00000010
70
+#define PANIC_PRINT_ALL_PRINTK_MSG	0x00000020
71
+unsigned long panic_print;
72
+
49
73
 ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
74
+
50
75
 EXPORT_SYMBOL(panic_notifier_list);
51
76
 
52
-void (*vendor_panic_cb)(u64 sp);
53
-EXPORT_SYMBOL_GPL(vendor_panic_cb);
77
+#ifdef CONFIG_SYSCTL
78
+static struct ctl_table kern_panic_table[] = {
79
+#ifdef CONFIG_SMP
80
+	{
81
+		.procname       = "oops_all_cpu_backtrace",
82
+		.data           = &sysctl_oops_all_cpu_backtrace,
83
+		.maxlen         = sizeof(int),
84
+		.mode           = 0644,
85
+		.proc_handler   = proc_dointvec_minmax,
86
+		.extra1         = SYSCTL_ZERO,
87
+		.extra2         = SYSCTL_ONE,
88
+	},
89
+#endif
90
+	{
91
+		.procname       = "warn_limit",
92
+		.data           = &warn_limit,
93
+		.maxlen         = sizeof(warn_limit),
94
+		.mode           = 0644,
95
+		.proc_handler   = proc_douintvec,
96
+	},
97
+	{ }
98
+};
99
+
100
+static __init int kernel_panic_sysctls_init(void)
101
+{
102
+	register_sysctl_init("kernel", kern_panic_table);
103
+	return 0;
104
+}
105
+late_initcall(kernel_panic_sysctls_init);
106
+#endif
107
+
108
+static atomic_t warn_count = ATOMIC_INIT(0);
109
+
110
+#ifdef CONFIG_SYSFS
111
+static ssize_t warn_count_show(struct kobject *kobj, struct kobj_attribute *attr,
112
+			       char *page)
113
+{
114
+	return sysfs_emit(page, "%d\n", atomic_read(&warn_count));
115
+}
116
+
117
+static struct kobj_attribute warn_count_attr = __ATTR_RO(warn_count);
118
+
119
+static __init int kernel_panic_sysfs_init(void)
120
+{
121
+	sysfs_add_file_to_group(kernel_kobj, &warn_count_attr.attr, NULL);
122
+	return 0;
123
+}
124
+late_initcall(kernel_panic_sysfs_init);
125
+#endif
54
126
 
55
127
 static long no_blink(int state)
56
128
 {
..
..
@@ -127,6 +199,40 @@
127
199
 }
128
200
 EXPORT_SYMBOL(nmi_panic);
129
201
 
202
+static void panic_print_sys_info(void)
203
+{
204
+	if (panic_print & PANIC_PRINT_ALL_PRINTK_MSG)
205
+		console_flush_on_panic(CONSOLE_REPLAY_ALL);
206
+
207
+	if (panic_print & PANIC_PRINT_TASK_INFO)
208
+		show_state();
209
+
210
+	if (panic_print & PANIC_PRINT_MEM_INFO)
211
+		show_mem(0, NULL);
212
+
213
+	if (panic_print & PANIC_PRINT_TIMER_INFO)
214
+		sysrq_timer_list_show();
215
+
216
+	if (panic_print & PANIC_PRINT_LOCK_INFO)
217
+		debug_show_all_locks();
218
+
219
+	if (panic_print & PANIC_PRINT_FTRACE_INFO)
220
+		ftrace_dump(DUMP_ALL);
221
+}
222
+
223
+void check_panic_on_warn(const char *origin)
224
+{
225
+	unsigned int limit;
226
+
227
+	if (panic_on_warn)
228
+		panic("%s: panic_on_warn set ...\n", origin);
229
+
230
+	limit = READ_ONCE(warn_limit);
231
+	if (atomic_inc_return(&warn_count) >= limit && limit)
232
+		panic("%s: system warned too often (kernel.warn_limit is %d)",
233
+		      origin, limit);
234
+}
235
+
130
236
 /**
131
237
  *	panic - halt the system
132
238
  *	@fmt: The text string to print
..
..
@@ -139,10 +245,20 @@
139
245
 {
140
246
 	static char buf[1024];
141
247
 	va_list args;
142
-	long i, i_next = 0;
248
+	long i, i_next = 0, len;
143
249
 	int state = 0;
144
250
 	int old_cpu, this_cpu;
145
251
 	bool _crash_kexec_post_notifiers = crash_kexec_post_notifiers;
252
+
253
+	if (panic_on_warn) {
254
+		/*
255
+		 * This thread may hit another WARN() in the panic path.
256
+		 * Resetting this prevents additional WARN() from panicking the
257
+		 * system on this thread.  Other threads are blocked by the
258
+		 * panic_mutex in panic().
259
+		 */
260
+		panic_on_warn = 0;
261
+	}
146
262
 
147
263
 	/*
148
264
 	 * Disable local interrupts. This will prevent panic_smp_self_stop
..
..
@@ -177,10 +293,12 @@
177
293
 	console_verbose();
178
294
 	bust_spinlocks(1);
179
295
 	va_start(args, fmt);
180
-	vsnprintf(buf, sizeof(buf), fmt, args);
296
+	len = vscnprintf(buf, sizeof(buf), fmt, args);
181
297
 	va_end(args);
182
-	if (vendor_panic_cb)
183
-		vendor_panic_cb(0);
298
+
299
+	if (len && buf[len - 1] == '\n')
300
+		buf[len - 1] = '\0';
301
+
184
302
 	pr_emerg("Kernel panic - not syncing: %s\n", buf);
185
303
 #ifdef CONFIG_DEBUG_BUGVERBOSE
186
304
 	/*
..
..
@@ -189,6 +307,13 @@
189
307
 	if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
190
308
 		dump_stack();
191
309
 #endif
310
+
311
+	/*
312
+	 * If kgdb is enabled, give it a chance to run before we stop all
313
+	 * the other CPUs or else we won't be able to debug processes left
314
+	 * running on them.
315
+	 */
316
+	kgdb_panic(buf);
192
317
 
193
318
 	/*
194
319
 	 * If we have crashed and we have a crash kernel loaded let it handle
..
..
@@ -253,7 +378,9 @@
253
378
 	 * panic() is not being callled from OOPS.
254
379
 	 */
255
380
 	debug_locks_off();
256
-	console_flush_on_panic();
381
+	console_flush_on_panic(CONSOLE_FLUSH_PENDING);
382
+
383
+	panic_print_sys_info();
257
384
 
258
385
 	if (!panic_blink)
259
386
 		panic_blink = no_blink;
..
..
@@ -294,14 +421,12 @@
294
421
 	}
295
422
 #endif
296
423
 #if defined(CONFIG_S390)
297
-	{
298
-		unsigned long caller;
299
-
300
-		caller = (unsigned long)__builtin_return_address(0);
301
-		disabled_wait(caller);
302
-	}
424
+	disabled_wait();
303
425
 #endif
304
426
 	pr_emerg("---[ end Kernel panic - not syncing: %s ]---\n", buf);
427
+
428
+	/* Do not scroll important messages printed above */
429
+	suppress_printk = 1;
305
430
 	local_irq_enable();
306
431
 	for (i = 0; ; i += PANIC_TIMER_STEP) {
307
432
 		touch_softlockup_watchdog();
..
..
@@ -343,7 +468,7 @@
343
468
 /**
344
469
  * print_tainted - return a string to represent the kernel taint state.
345
470
  *
346
- * For individual taint flag meanings, see Documentation/sysctl/kernel.txt
471
+ * For individual taint flag meanings, see Documentation/admin-guide/sysctl/kernel.rst
347
472
  *
348
473
  * The string is overwritten by the next call to print_tainted(),
349
474
  * but is always NULL terminated.
..
..
@@ -396,6 +521,11 @@
396
521
 		pr_warn("Disabling lock debugging due to kernel taint\n");
397
522
 
398
523
 	set_bit(flag, &tainted_mask);
524
+
525
+	if (tainted_mask & panic_on_taint) {
526
+		panic_on_taint = 0;
527
+		panic("panic_on_taint set ...");
528
+	}
399
529
 }
400
530
 EXPORT_SYMBOL(add_taint);
401
531
 
..
..
@@ -452,7 +582,7 @@
452
582
  * Return true if the calling CPU is allowed to print oops-related info.
453
583
  * This is a bit racy..
454
584
  */
455
-int oops_may_print(void)
585
+bool oops_may_print(void)
456
586
 {
457
587
 	return pause_on_oops_flag == 0;
458
588
 }
..
..
@@ -477,6 +607,9 @@
477
607
 	/* can't trust the integrity of the kernel anymore: */
478
608
 	debug_locks_off();
479
609
 	do_oops_enter_exit();
610
+
611
+	if (sysctl_oops_all_cpu_backtrace)
612
+		trigger_all_cpu_backtrace();
480
613
 }
481
614
 
482
615
 /*
..
..
@@ -486,18 +619,16 @@
486
619
 
487
620
 static int init_oops_id(void)
488
621
 {
489
-#ifndef CONFIG_PREEMPT_RT_FULL
490
622
 	if (!oops_id)
491
623
 		get_random_bytes(&oops_id, sizeof(oops_id));
492
624
 	else
493
-#endif
494
625
 		oops_id++;
495
626
 
496
627
 	return 0;
497
628
 }
498
629
 late_initcall(init_oops_id);
499
630
 
500
-void print_oops_end_marker(void)
631
+static void print_oops_end_marker(void)
501
632
 {
502
633
 	init_oops_id();
503
634
 	pr_warn("---[ end trace %016llx ]---\n", (unsigned long long)oops_id);
..
..
@@ -524,9 +655,6 @@
524
655
 {
525
656
 	disable_trace_on_warning();
526
657
 
527
-	if (args)
528
-		pr_warn(CUT_HERE);
529
-
530
658
 	if (file)
531
659
 		pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS\n",
532
660
 			raw_smp_processor_id(), current->pid, file, line,
..
..
@@ -538,22 +666,14 @@
538
666
 	if (args)
539
667
 		vprintk(args->fmt, args->args);
540
668
 
541
-	if (panic_on_warn) {
542
-		/*
543
-		 * This thread may hit another WARN() in the panic path.
544
-		 * Resetting this prevents additional WARN() from panicking the
545
-		 * system on this thread.  Other threads are blocked by the
546
-		 * panic_mutex in panic().
547
-		 */
548
-		panic_on_warn = 0;
549
-		panic("panic_on_warn set ...\n");
550
-	}
551
-
552
669
 	print_modules();
553
670
 
554
671
 	if (regs)
555
672
 		show_regs(regs);
556
-	else
673
+
674
+	check_panic_on_warn("kernel");
675
+
676
+	if (!regs)
557
677
 		dump_stack();
558
678
 
559
679
 	print_irqtrace_events(current);
..
..
@@ -564,37 +684,26 @@
564
684
 	add_taint(taint, LOCKDEP_STILL_OK);
565
685
 }
566
686
 
567
-#ifdef WANT_WARN_ON_SLOWPATH
568
-void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
687
+#ifndef __WARN_FLAGS
688
+void warn_slowpath_fmt(const char *file, int line, unsigned taint,
689
+		       const char *fmt, ...)
569
690
 {
570
691
 	struct warn_args args;
571
692
 
572
-	args.fmt = fmt;
573
-	va_start(args.args, fmt);
574
-	__warn(file, line, __builtin_return_address(0), TAINT_WARN, NULL,
575
-	       &args);
576
-	va_end(args.args);
577
-}
578
-EXPORT_SYMBOL(warn_slowpath_fmt);
693
+	pr_warn(CUT_HERE);
579
694
 
580
-void warn_slowpath_fmt_taint(const char *file, int line,
581
-			     unsigned taint, const char *fmt, ...)
582
-{
583
-	struct warn_args args;
695
+	if (!fmt) {
696
+		__warn(file, line, __builtin_return_address(0), taint,
697
+		       NULL, NULL);
698
+		return;
699
+	}
584
700
 
585
701
 	args.fmt = fmt;
586
702
 	va_start(args.args, fmt);
587
703
 	__warn(file, line, __builtin_return_address(0), taint, NULL, &args);
588
704
 	va_end(args.args);
589
705
 }
590
-EXPORT_SYMBOL(warn_slowpath_fmt_taint);
591
-
592
-void warn_slowpath_null(const char *file, int line)
593
-{
594
-	pr_warn(CUT_HERE);
595
-	__warn(file, line, __builtin_return_address(0), TAINT_WARN, NULL, NULL);
596
-}
597
-EXPORT_SYMBOL(warn_slowpath_null);
706
+EXPORT_SYMBOL(warn_slowpath_fmt);
598
707
 #else
599
708
 void __warn_printk(const char *fmt, ...)
600
709
 {
..
..
@@ -620,16 +729,14 @@
620
729
 	return 0;
621
730
 }
622
731
 
623
-DEFINE_SIMPLE_ATTRIBUTE(clear_warn_once_fops,
624
-			NULL,
625
-			clear_warn_once_set,
626
-			"%lld\n");
732
+DEFINE_DEBUGFS_ATTRIBUTE(clear_warn_once_fops, NULL, clear_warn_once_set,
733
+			 "%lld\n");
627
734
 
628
735
 static __init int register_warn_debugfs(void)
629
736
 {
630
737
 	/* Don't care about failure */
631
-	debugfs_create_file("clear_warn_once", 0200, NULL,
632
-			    NULL, &clear_warn_once_fops);
738
+	debugfs_create_file_unsafe("clear_warn_once", 0200, NULL, NULL,
739
+				   &clear_warn_once_fops);
633
740
 	return 0;
634
741
 }
635
742
 
..
..
@@ -642,27 +749,19 @@
642
749
  * Called when gcc's -fstack-protector feature is used, and
643
750
  * gcc detects corruption of the on-stack canary value
644
751
  */
645
-__visible void __stack_chk_fail(void)
752
+__visible noinstr void __stack_chk_fail(void)
646
753
 {
754
+	instrumentation_begin();
647
755
 	panic("stack-protector: Kernel stack is corrupted in: %pB",
648
756
 		__builtin_return_address(0));
757
+	instrumentation_end();
649
758
 }
650
759
 EXPORT_SYMBOL(__stack_chk_fail);
651
760
 
652
761
 #endif
653
762
 
654
-#ifdef CONFIG_ARCH_HAS_REFCOUNT
655
-void refcount_error_report(struct pt_regs *regs, const char *err)
656
-{
657
-	WARN_RATELIMIT(1, "refcount_t %s at %pB in %s[%d], uid/euid: %u/%u\n",
658
-		err, (void *)instruction_pointer(regs),
659
-		current->comm, task_pid_nr(current),
660
-		from_kuid_munged(&init_user_ns, current_uid()),
661
-		from_kuid_munged(&init_user_ns, current_euid()));
662
-}
663
-#endif
664
-
665
763
 core_param(panic, panic_timeout, int, 0644);
764
+core_param(panic_print, panic_print, ulong, 0644);
666
765
 core_param(pause_on_oops, pause_on_oops, int, 0644);
667
766
 core_param(panic_on_warn, panic_on_warn, int, 0644);
668
767
 core_param(crash_kexec_post_notifiers, crash_kexec_post_notifiers, bool, 0644);
..
..
@@ -676,3 +775,30 @@
676
775
 	return 0;
677
776
 }
678
777
 early_param("oops", oops_setup);
778
+
779
+static int __init panic_on_taint_setup(char *s)
780
+{
781
+	char *taint_str;
782
+
783
+	if (!s)
784
+		return -EINVAL;
785
+
786
+	taint_str = strsep(&s, ",");
787
+	if (kstrtoul(taint_str, 16, &panic_on_taint))
788
+		return -EINVAL;
789
+
790
+	/* make sure panic_on_taint doesn't hold out-of-range TAINT flags */
791
+	panic_on_taint &= TAINT_FLAGS_MAX;
792
+
793
+	if (!panic_on_taint)
794
+		return -EINVAL;
795
+
796
+	if (s && !strcmp(s, "nousertaint"))
797
+		panic_on_taint_nousertaint = true;
798
+
799
+	pr_info("panic_on_taint: bitmask=0x%lx nousertaint_mode=%sabled\n",
800
+		panic_on_taint, panic_on_taint_nousertaint ? "en" : "dis");
801
+
802
+	return 0;
803
+}
804
+early_param("panic_on_taint", panic_on_taint_setup);