Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 203 insertions, 0 deletions

diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c
new file mode 100644
index 000000000..8ed81b252
--- /dev/null
+++ b/arch/ia64/kernel/irq.c
@@ -0,0 +1,203 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *	linux/arch/ia64/kernel/irq.c
+ *
+ *	Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
+ *
+ * This file contains the code used by various IRQ handling routines:
+ * asking for different IRQs should be done through these routines
+ * instead of just grabbing them. Thus setups with different IRQ numbers
+ * shouldn't result in any weird surprises, and installing new handlers
+ * should be easier.
+ *
+ * Copyright (C) Ashok Raj<ashok.raj@intel.com>, Intel Corporation 2004
+ *
+ * 4/14/2004: Added code to handle cpu migration and do safe irq
+ *			migration without losing interrupts for iosapic
+ *			architecture.
+ */
+
+#include <asm/delay.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+
+#include <asm/mca.h>
+
+/*
+ * 'what should we do if we get a hw irq event on an illegal vector'.
+ * each architecture has to answer this themselves.
+ */
+void ack_bad_irq(unsigned int irq)
+{
+	printk(KERN_ERR "Unexpected irq vector 0x%x on CPU %u!\n", irq, smp_processor_id());
+}
+
+#ifdef CONFIG_IA64_GENERIC
+ia64_vector __ia64_irq_to_vector(int irq)
+{
+	return irq_cfg[irq].vector;
+}
+
+unsigned int __ia64_local_vector_to_irq (ia64_vector vec)
+{
+	return __this_cpu_read(vector_irq[vec]);
+}
+#endif
+
+/*
+ * Interrupt statistics:
+ */
+
+atomic_t irq_err_count;
+
+/*
+ * /proc/interrupts printing:
+ */
+int arch_show_interrupts(struct seq_file *p, int prec)
+{
+	seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
+	return 0;
+}
+
+#ifdef CONFIG_SMP
+static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 };
+
+void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
+{
+	if (irq < NR_IRQS) {
+		cpumask_copy(irq_get_affinity_mask(irq),
+			     cpumask_of(cpu_logical_id(hwid)));
+		irq_redir[irq] = (char) (redir & 0xff);
+	}
+}
+
+bool is_affinity_mask_valid(const struct cpumask *cpumask)
+{
+	if (ia64_platform_is("sn2")) {
+		/* Only allow one CPU to be specified in the smp_affinity mask */
+		if (cpumask_weight(cpumask) != 1)
+			return false;
+	}
+	return true;
+}
+
+#endif /* CONFIG_SMP */
+
+int __init arch_early_irq_init(void)
+{
+	ia64_mca_irq_init();
+	return 0;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+unsigned int vectors_in_migration[NR_IRQS];
+
+/*
+ * Since cpu_online_mask is already updated, we just need to check for
+ * affinity that has zeros
+ */
+static void migrate_irqs(void)
+{
+	int 		irq, new_cpu;
+
+	for (irq=0; irq < NR_IRQS; irq++) {
+		struct irq_desc *desc = irq_to_desc(irq);
+		struct irq_data *data = irq_desc_get_irq_data(desc);
+		struct irq_chip *chip = irq_data_get_irq_chip(data);
+
+		if (irqd_irq_disabled(data))
+			continue;
+
+		/*
+		 * No handling for now.
+		 * TBD: Implement a disable function so we can now
+		 * tell CPU not to respond to these local intr sources.
+		 * such as ITV,CPEI,MCA etc.
+		 */
+		if (irqd_is_per_cpu(data))
+			continue;
+
+		if (cpumask_any_and(irq_data_get_affinity_mask(data),
+				    cpu_online_mask) >= nr_cpu_ids) {
+			/*
+			 * Save it for phase 2 processing
+			 */
+			vectors_in_migration[irq] = irq;
+
+			new_cpu = cpumask_any(cpu_online_mask);
+
+			/*
+			 * Al three are essential, currently WARN_ON.. maybe panic?
+			 */
+			if (chip && chip->irq_disable &&
+				chip->irq_enable && chip->irq_set_affinity) {
+				chip->irq_disable(data);
+				chip->irq_set_affinity(data,
+						       cpumask_of(new_cpu), false);
+				chip->irq_enable(data);
+			} else {
+				WARN_ON((!chip || !chip->irq_disable ||
+					 !chip->irq_enable ||
+					 !chip->irq_set_affinity));
+			}
+		}
+	}
+}
+
+void fixup_irqs(void)
+{
+	unsigned int irq;
+	extern void ia64_process_pending_intr(void);
+	extern volatile int time_keeper_id;
+
+	/* Mask ITV to disable timer */
+	ia64_set_itv(1 << 16);
+
+	/*
+	 * Find a new timesync master
+	 */
+	if (smp_processor_id() == time_keeper_id) {
+		time_keeper_id = cpumask_first(cpu_online_mask);
+		printk ("CPU %d is now promoted to time-keeper master\n", time_keeper_id);
+	}
+
+	/*
+	 * Phase 1: Locate IRQs bound to this cpu and
+	 * relocate them for cpu removal.
+	 */
+	migrate_irqs();
+
+	/*
+	 * Phase 2: Perform interrupt processing for all entries reported in
+	 * local APIC.
+	 */
+	ia64_process_pending_intr();
+
+	/*
+	 * Phase 3: Now handle any interrupts not captured in local APIC.
+	 * This is to account for cases that device interrupted during the time the
+	 * rte was being disabled and re-programmed.
+	 */
+	for (irq=0; irq < NR_IRQS; irq++) {
+		if (vectors_in_migration[irq]) {
+			struct pt_regs *old_regs = set_irq_regs(NULL);
+
+			vectors_in_migration[irq]=0;
+			generic_handle_irq(irq);
+			set_irq_regs(old_regs);
+		}
+	}
+
+	/*
+	 * Now let processor die. We do irq disable and max_xtp() to
+	 * ensure there is no more interrupts routed to this processor.
+	 * But the local timer interrupt can have 1 pending which we
+	 * take care in timer_interrupt().
+	 */
+	max_xtp();
+	local_irq_disable();
+}
+#endif