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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/arch/arm/kernel/smp.c
....@@ -1,11 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  *  linux/arch/arm/kernel/smp.c
34  *
45  *  Copyright (C) 2002 ARM Limited, All Rights Reserved.
5
- *
6
- * This program is free software; you can redistribute it and/or modify
7
- * it under the terms of the GNU General Public License version 2 as
8
- * published by the Free Software Foundation.
96  */
107 #include <linux/module.h>
118 #include <linux/delay.h>
....@@ -29,6 +26,7 @@
2926 #include <linux/completion.h>
3027 #include <linux/cpufreq.h>
3128 #include <linux/irq_work.h>
29
+#include <linux/kernel_stat.h>
3230 
3331 #include <linux/atomic.h>
3432 #include <asm/bugs.h>
....@@ -40,8 +38,6 @@
4038 #include <asm/idmap.h>
4139 #include <asm/topology.h>
4240 #include <asm/mmu_context.h>
43
-#include <asm/pgtable.h>
44
-#include <asm/pgalloc.h>
4541 #include <asm/procinfo.h>
4642 #include <asm/processor.h>
4743 #include <asm/sections.h>
....@@ -55,18 +51,16 @@
5551 #define CREATE_TRACE_POINTS
5652 #include <trace/events/ipi.h>
5753 
54
+EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_raise);
55
+EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_entry);
56
+EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_exit);
57
+
5858 /*
5959  * as from 2.5, kernels no longer have an init_tasks structure
6060  * so we need some other way of telling a new secondary core
6161  * where to place its SVC stack
6262  */
6363 struct secondary_data secondary_data;
64
-
65
-/*
66
- * control for which core is the next to come out of the secondary
67
- * boot "holding pen"
68
- */
69
-volatile int pen_release = -1;
7064 
7165 enum ipi_msg_type {
7266 	IPI_WAKEUP,
....@@ -76,17 +70,25 @@
7670 	IPI_CPU_STOP,
7771 	IPI_IRQ_WORK,
7872 	IPI_COMPLETION,
73
+	NR_IPI,
7974 	/*
8075 	 * CPU_BACKTRACE is special and not included in NR_IPI
8176 	 * or tracable with trace_ipi_*
8277 	 */
83
-	IPI_CPU_BACKTRACE,
78
+	IPI_CPU_BACKTRACE = NR_IPI,
8479 	/*
8580 	 * SGI8-15 can be reserved by secure firmware, and thus may
8681 	 * not be usable by the kernel. Please keep the above limited
8782 	 * to at most 8 entries.
8883 	 */
84
+	MAX_IPI
8985 };
86
+
87
+static int ipi_irq_base __read_mostly;
88
+static int nr_ipi __read_mostly = NR_IPI;
89
+static struct irq_desc *ipi_desc[MAX_IPI] __read_mostly;
90
+
91
+static void ipi_setup(int cpu);
9092 
9193 static DECLARE_COMPLETION(cpu_running);
9294 
....@@ -237,6 +239,17 @@
237239 	return cpu != 0;
238240 }
239241 
242
+static void ipi_teardown(int cpu)
243
+{
244
+	int i;
245
+
246
+	if (WARN_ON_ONCE(!ipi_irq_base))
247
+		return;
248
+
249
+	for (i = 0; i < nr_ipi; i++)
250
+		disable_percpu_irq(ipi_irq_base + i);
251
+}
252
+
240253 /*
241254  * __cpu_disable runs on the processor to be shutdown.
242255  */
....@@ -249,11 +262,16 @@
249262 	if (ret)
250263 		return ret;
251264 
265
+#ifdef CONFIG_GENERIC_ARCH_TOPOLOGY
266
+	remove_cpu_topology(cpu);
267
+#endif
268
+
252269 	/*
253270 	 * Take this CPU offline.  Once we clear this, we can't return,
254271 	 * and we must not schedule until we're ready to give up the cpu.
255272 	 */
256273 	set_cpu_online(cpu, false);
274
+	ipi_teardown(cpu);
257275 
258276 	/*
259277 	 * OK - migrate IRQs away from this CPU
....@@ -273,15 +291,13 @@
273291 	return 0;
274292 }
275293 
276
-static DECLARE_COMPLETION(cpu_died);
277
-
278294 /*
279295  * called on the thread which is asking for a CPU to be shutdown -
280296  * waits until shutdown has completed, or it is timed out.
281297  */
282298 void __cpu_die(unsigned int cpu)
283299 {
284
-	if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) {
300
+	if (!cpu_wait_death(cpu, 5)) {
285301 		pr_err("CPU%u: cpu didn't die\n", cpu);
286302 		return;
287303 	}
....@@ -328,7 +344,7 @@
328344 	 * this returns, power and/or clocks can be removed at any point
329345 	 * from this CPU and its cache by platform_cpu_kill().
330346 	 */
331
-	complete(&cpu_died);
347
+	(void)cpu_report_death();
332348 
333349 	/*
334350 	 * Ensure that the cache lines associated with that completion are
....@@ -381,6 +397,7 @@
381397 	cpu_info->cpuid = read_cpuid_id();
382398 
383399 	store_cpu_topology(cpuid);
400
+	check_cpu_icache_size(cpuid);
384401 }
385402 
386403 /*
....@@ -419,7 +436,6 @@
419436 #endif
420437 	pr_debug("CPU%u: Booted secondary processor\n", cpu);
421438 
422
-	preempt_disable();
423439 	trace_hardirqs_off();
424440 
425441 	/*
....@@ -429,6 +445,8 @@
429445 		smp_ops.smp_secondary_init(cpu);
430446 
431447 	notify_cpu_starting(cpu);
448
+
449
+	ipi_setup(cpu);
432450 
433451 	calibrate_delay();
434452 
....@@ -508,22 +526,6 @@
508526 	}
509527 }
510528 
511
-static void (*__smp_cross_call)(const struct cpumask *, unsigned int);
512
-
513
-void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int))
514
-{
515
-	if (!__smp_cross_call)
516
-		__smp_cross_call = fn;
517
-}
518
-
519
-static void (*__smp_update_ipi_history_cb)(int cpu);
520
-
521
-void set_update_ipi_history_callback(void (*fn)(int))
522
-{
523
-	__smp_update_ipi_history_cb = fn;
524
-}
525
-EXPORT_SYMBOL_GPL(set_update_ipi_history_callback);
526
-
527529 static const char *ipi_types[NR_IPI] __tracepoint_string = {
528530 #define S(x,s)	[x] = s
529531 	S(IPI_WAKEUP, "CPU wakeup interrupts"),
....@@ -535,36 +537,26 @@
535537 	S(IPI_COMPLETION, "completion interrupts"),
536538 };
537539 
538
-static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
539
-{
540
-	trace_ipi_raise_rcuidle(target, ipi_types[ipinr]);
541
-	__smp_cross_call(target, ipinr);
542
-}
540
+static void smp_cross_call(const struct cpumask *target, unsigned int ipinr);
543541 
544542 void show_ipi_list(struct seq_file *p, int prec)
545543 {
546544 	unsigned int cpu, i;
547545 
548546 	for (i = 0; i < NR_IPI; i++) {
547
+		unsigned int irq;
548
+
549
+		if (!ipi_desc[i])
550
+			continue;
551
+
552
+		irq = irq_desc_get_irq(ipi_desc[i]);
549553 		seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
550554 
551555 		for_each_online_cpu(cpu)
552
-			seq_printf(p, "%10u ",
553
-				   __get_irq_stat(cpu, ipi_irqs[i]));
556
+			seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
554557 
555558 		seq_printf(p, " %s\n", ipi_types[i]);
556559 	}
557
-}
558
-
559
-u64 smp_irq_stat_cpu(unsigned int cpu)
560
-{
561
-	u64 sum = 0;
562
-	int i;
563
-
564
-	for (i = 0; i < NR_IPI; i++)
565
-		sum += __get_irq_stat(cpu, ipi_irqs[i]);
566
-
567
-	return sum;
568560 }
569561 
570562 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
....@@ -643,15 +635,12 @@
643635 	handle_IPI(ipinr, regs);
644636 }
645637 
646
-void handle_IPI(int ipinr, struct pt_regs *regs)
638
+static void do_handle_IPI(int ipinr)
647639 {
648640 	unsigned int cpu = smp_processor_id();
649
-	struct pt_regs *old_regs = set_irq_regs(regs);
650641 
651
-	if ((unsigned)ipinr < NR_IPI) {
642
+	if ((unsigned)ipinr < NR_IPI)
652643 		trace_ipi_entry_rcuidle(ipi_types[ipinr]);
653
-		__inc_irq_stat(cpu, ipi_irqs[ipinr]);
654
-	}
655644 
656645 	switch (ipinr) {
657646 	case IPI_WAKEUP:
....@@ -659,9 +648,7 @@
659648 
660649 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
661650 	case IPI_TIMER:
662
-		irq_enter();
663651 		tick_receive_broadcast();
664
-		irq_exit();
665652 		break;
666653 #endif
667654 
....@@ -670,36 +657,26 @@
670657 		break;
671658 
672659 	case IPI_CALL_FUNC:
673
-		irq_enter();
674660 		generic_smp_call_function_interrupt();
675
-		irq_exit();
676661 		break;
677662 
678663 	case IPI_CPU_STOP:
679
-		irq_enter();
680664 		ipi_cpu_stop(cpu);
681
-		irq_exit();
682665 		break;
683666 
684667 #ifdef CONFIG_IRQ_WORK
685668 	case IPI_IRQ_WORK:
686
-		irq_enter();
687669 		irq_work_run();
688
-		irq_exit();
689670 		break;
690671 #endif
691672 
692673 	case IPI_COMPLETION:
693
-		irq_enter();
694674 		ipi_complete(cpu);
695
-		irq_exit();
696675 		break;
697676 
698677 	case IPI_CPU_BACKTRACE:
699678 		printk_nmi_enter();
700
-		irq_enter();
701
-		nmi_cpu_backtrace(regs);
702
-		irq_exit();
679
+		nmi_cpu_backtrace(get_irq_regs());
703680 		printk_nmi_exit();
704681 		break;
705682 
....@@ -711,13 +688,73 @@
711688 
712689 	if ((unsigned)ipinr < NR_IPI)
713690 		trace_ipi_exit_rcuidle(ipi_types[ipinr]);
691
+}
692
+
693
+/* Legacy version, should go away once all irqchips have been converted */
694
+void handle_IPI(int ipinr, struct pt_regs *regs)
695
+{
696
+	struct pt_regs *old_regs = set_irq_regs(regs);
697
+
698
+	irq_enter();
699
+	do_handle_IPI(ipinr);
700
+	irq_exit();
701
+
714702 	set_irq_regs(old_regs);
703
+}
704
+
705
+static irqreturn_t ipi_handler(int irq, void *data)
706
+{
707
+	do_handle_IPI(irq - ipi_irq_base);
708
+	return IRQ_HANDLED;
709
+}
710
+
711
+static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
712
+{
713
+	trace_ipi_raise_rcuidle(target, ipi_types[ipinr]);
714
+	__ipi_send_mask(ipi_desc[ipinr], target);
715
+}
716
+
717
+static void ipi_setup(int cpu)
718
+{
719
+	int i;
720
+
721
+	if (WARN_ON_ONCE(!ipi_irq_base))
722
+		return;
723
+
724
+	for (i = 0; i < nr_ipi; i++)
725
+		enable_percpu_irq(ipi_irq_base + i, 0);
726
+}
727
+
728
+void __init set_smp_ipi_range(int ipi_base, int n)
729
+{
730
+	int i;
731
+
732
+	WARN_ON(n < MAX_IPI);
733
+	nr_ipi = min(n, MAX_IPI);
734
+
735
+	for (i = 0; i < nr_ipi; i++) {
736
+		int err;
737
+
738
+		err = request_percpu_irq(ipi_base + i, ipi_handler,
739
+					 "IPI", &irq_stat);
740
+		WARN_ON(err);
741
+
742
+		ipi_desc[i] = irq_to_desc(ipi_base + i);
743
+		irq_set_status_flags(ipi_base + i, IRQ_HIDDEN);
744
+
745
+		/* The recheduling IPI is special... */
746
+		if (i == IPI_RESCHEDULE)
747
+			__irq_modify_status(ipi_base + i, 0, IRQ_RAW, ~0);
748
+	}
749
+
750
+	ipi_irq_base = ipi_base;
751
+
752
+	/* Setup the boot CPU immediately */
753
+	ipi_setup(smp_processor_id());
715754 }
716755 
717756 void smp_send_reschedule(int cpu)
718757 {
719
-	if (__smp_update_ipi_history_cb)
720
-		__smp_update_ipi_history_cb(cpu);
721758 	smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE);
722759 }
723760 
....@@ -774,15 +811,20 @@
774811 					unsigned long val, void *data)
775812 {
776813 	struct cpufreq_freqs *freq = data;
777
-	int cpu = freq->cpu;
814
+	struct cpumask *cpus = freq->policy->cpus;
815
+	int cpu, first = cpumask_first(cpus);
816
+	unsigned int lpj;
778817 
779818 	if (freq->flags & CPUFREQ_CONST_LOOPS)
780819 		return NOTIFY_OK;
781820 
782
-	if (!per_cpu(l_p_j_ref, cpu)) {
783
-		per_cpu(l_p_j_ref, cpu) =
784
-			per_cpu(cpu_data, cpu).loops_per_jiffy;
785
-		per_cpu(l_p_j_ref_freq, cpu) = freq->old;
821
+	if (!per_cpu(l_p_j_ref, first)) {
822
+		for_each_cpu(cpu, cpus) {
823
+			per_cpu(l_p_j_ref, cpu) =
824
+				per_cpu(cpu_data, cpu).loops_per_jiffy;
825
+			per_cpu(l_p_j_ref_freq, cpu) = freq->old;
826
+		}
827
+
786828 		if (!global_l_p_j_ref) {
787829 			global_l_p_j_ref = loops_per_jiffy;
788830 			global_l_p_j_ref_freq = freq->old;
....@@ -794,10 +836,11 @@
794836 		loops_per_jiffy = cpufreq_scale(global_l_p_j_ref,
795837 						global_l_p_j_ref_freq,
796838 						freq->new);
797
-		per_cpu(cpu_data, cpu).loops_per_jiffy =
798
-			cpufreq_scale(per_cpu(l_p_j_ref, cpu),
799
-					per_cpu(l_p_j_ref_freq, cpu),
800
-					freq->new);
839
+
840
+		lpj = cpufreq_scale(per_cpu(l_p_j_ref, first),
841
+				    per_cpu(l_p_j_ref_freq, first), freq->new);
842
+		for_each_cpu(cpu, cpus)
843
+			per_cpu(cpu_data, cpu).loops_per_jiffy = lpj;
801844 	}
802845 	return NOTIFY_OK;
803846 }
....@@ -817,7 +860,7 @@
817860 
818861 static void raise_nmi(cpumask_t *mask)
819862 {
820
-	__smp_cross_call(mask, IPI_CPU_BACKTRACE);
863
+	__ipi_send_mask(ipi_desc[IPI_CPU_BACKTRACE], mask);
821864 }
822865 
823866 void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)