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![Tony Luck](/assets/img/avatar_default.png)
Fix arch/ia64/kernel/irq_ia64.c:586:1: warning: no return statement in function returning non-void [-Wreturn-type] arch/ia64/mm/contig.c:111:6: warning: unused variable 'rc' [-Wunused-variable] arch/ia64/mm/discontig.c:189:39: warning: unused variable 'rc' [-Wunused-variable] Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
665 lines
15 KiB
C
665 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/ia64/kernel/irq_ia64.c
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*
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* Copyright (C) 1998-2001 Hewlett-Packard Co
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* Stephane Eranian <eranian@hpl.hp.com>
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*
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* 6/10/99: Updated to bring in sync with x86 version to facilitate
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* support for SMP and different interrupt controllers.
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*
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* 09/15/00 Goutham Rao <goutham.rao@intel.com> Implemented pci_irq_to_vector
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* PCI to vector allocation routine.
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* 04/14/2004 Ashok Raj <ashok.raj@intel.com>
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* Added CPU Hotplug handling for IPF.
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*/
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#include <linux/module.h>
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#include <linux/jiffies.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/kernel_stat.h>
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#include <linux/ptrace.h>
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#include <linux/signal.h>
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#include <linux/smp.h>
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#include <linux/threads.h>
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#include <linux/bitops.h>
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#include <linux/irq.h>
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#include <linux/ratelimit.h>
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#include <linux/acpi.h>
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#include <linux/sched.h>
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#include <asm/delay.h>
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#include <asm/intrinsics.h>
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#include <asm/io.h>
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#include <asm/hw_irq.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#ifdef CONFIG_PERFMON
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# include <asm/perfmon.h>
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#endif
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#define IRQ_DEBUG 0
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#define IRQ_VECTOR_UNASSIGNED (0)
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#define IRQ_UNUSED (0)
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#define IRQ_USED (1)
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#define IRQ_RSVD (2)
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int ia64_first_device_vector = IA64_DEF_FIRST_DEVICE_VECTOR;
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int ia64_last_device_vector = IA64_DEF_LAST_DEVICE_VECTOR;
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/* default base addr of IPI table */
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void __iomem *ipi_base_addr = ((void __iomem *)
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(__IA64_UNCACHED_OFFSET | IA64_IPI_DEFAULT_BASE_ADDR));
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static cpumask_t vector_allocation_domain(int cpu);
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/*
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* Legacy IRQ to IA-64 vector translation table.
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*/
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__u8 isa_irq_to_vector_map[16] = {
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/* 8259 IRQ translation, first 16 entries */
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0x2f, 0x20, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x29,
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0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21
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};
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EXPORT_SYMBOL(isa_irq_to_vector_map);
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DEFINE_SPINLOCK(vector_lock);
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struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
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[0 ... NR_IRQS - 1] = {
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.vector = IRQ_VECTOR_UNASSIGNED,
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.domain = CPU_MASK_NONE
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}
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};
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DEFINE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq) = {
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[0 ... IA64_NUM_VECTORS - 1] = -1
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};
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static cpumask_t vector_table[IA64_NUM_VECTORS] = {
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[0 ... IA64_NUM_VECTORS - 1] = CPU_MASK_NONE
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};
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static int irq_status[NR_IRQS] = {
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[0 ... NR_IRQS -1] = IRQ_UNUSED
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};
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static inline int find_unassigned_irq(void)
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{
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int irq;
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for (irq = IA64_FIRST_DEVICE_VECTOR; irq < NR_IRQS; irq++)
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if (irq_status[irq] == IRQ_UNUSED)
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return irq;
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return -ENOSPC;
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}
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static inline int find_unassigned_vector(cpumask_t domain)
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{
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cpumask_t mask;
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int pos, vector;
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cpumask_and(&mask, &domain, cpu_online_mask);
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if (cpumask_empty(&mask))
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return -EINVAL;
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for (pos = 0; pos < IA64_NUM_DEVICE_VECTORS; pos++) {
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vector = IA64_FIRST_DEVICE_VECTOR + pos;
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cpumask_and(&mask, &domain, &vector_table[vector]);
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if (!cpumask_empty(&mask))
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continue;
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return vector;
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}
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return -ENOSPC;
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}
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static int __bind_irq_vector(int irq, int vector, cpumask_t domain)
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{
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cpumask_t mask;
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int cpu;
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struct irq_cfg *cfg = &irq_cfg[irq];
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BUG_ON((unsigned)irq >= NR_IRQS);
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BUG_ON((unsigned)vector >= IA64_NUM_VECTORS);
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cpumask_and(&mask, &domain, cpu_online_mask);
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if (cpumask_empty(&mask))
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return -EINVAL;
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if ((cfg->vector == vector) && cpumask_equal(&cfg->domain, &domain))
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return 0;
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if (cfg->vector != IRQ_VECTOR_UNASSIGNED)
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return -EBUSY;
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for_each_cpu(cpu, &mask)
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per_cpu(vector_irq, cpu)[vector] = irq;
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cfg->vector = vector;
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cfg->domain = domain;
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irq_status[irq] = IRQ_USED;
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cpumask_or(&vector_table[vector], &vector_table[vector], &domain);
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return 0;
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}
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int bind_irq_vector(int irq, int vector, cpumask_t domain)
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{
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&vector_lock, flags);
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ret = __bind_irq_vector(irq, vector, domain);
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spin_unlock_irqrestore(&vector_lock, flags);
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return ret;
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}
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static void __clear_irq_vector(int irq)
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{
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int vector, cpu;
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cpumask_t domain;
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struct irq_cfg *cfg = &irq_cfg[irq];
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BUG_ON((unsigned)irq >= NR_IRQS);
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BUG_ON(cfg->vector == IRQ_VECTOR_UNASSIGNED);
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vector = cfg->vector;
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domain = cfg->domain;
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for_each_cpu_and(cpu, &cfg->domain, cpu_online_mask)
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per_cpu(vector_irq, cpu)[vector] = -1;
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cfg->vector = IRQ_VECTOR_UNASSIGNED;
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cfg->domain = CPU_MASK_NONE;
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irq_status[irq] = IRQ_UNUSED;
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cpumask_andnot(&vector_table[vector], &vector_table[vector], &domain);
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}
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static void clear_irq_vector(int irq)
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{
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unsigned long flags;
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spin_lock_irqsave(&vector_lock, flags);
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__clear_irq_vector(irq);
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spin_unlock_irqrestore(&vector_lock, flags);
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}
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int
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ia64_native_assign_irq_vector (int irq)
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{
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unsigned long flags;
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int vector, cpu;
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cpumask_t domain = CPU_MASK_NONE;
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vector = -ENOSPC;
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spin_lock_irqsave(&vector_lock, flags);
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for_each_online_cpu(cpu) {
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domain = vector_allocation_domain(cpu);
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vector = find_unassigned_vector(domain);
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if (vector >= 0)
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break;
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}
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if (vector < 0)
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goto out;
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if (irq == AUTO_ASSIGN)
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irq = vector;
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BUG_ON(__bind_irq_vector(irq, vector, domain));
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out:
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spin_unlock_irqrestore(&vector_lock, flags);
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return vector;
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}
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void
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ia64_native_free_irq_vector (int vector)
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{
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if (vector < IA64_FIRST_DEVICE_VECTOR ||
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vector > IA64_LAST_DEVICE_VECTOR)
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return;
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clear_irq_vector(vector);
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}
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int
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reserve_irq_vector (int vector)
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{
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if (vector < IA64_FIRST_DEVICE_VECTOR ||
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vector > IA64_LAST_DEVICE_VECTOR)
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return -EINVAL;
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return !!bind_irq_vector(vector, vector, CPU_MASK_ALL);
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}
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/*
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* Initialize vector_irq on a new cpu. This function must be called
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* with vector_lock held.
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*/
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void __setup_vector_irq(int cpu)
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{
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int irq, vector;
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/* Clear vector_irq */
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for (vector = 0; vector < IA64_NUM_VECTORS; ++vector)
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per_cpu(vector_irq, cpu)[vector] = -1;
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/* Mark the inuse vectors */
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for (irq = 0; irq < NR_IRQS; ++irq) {
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if (!cpumask_test_cpu(cpu, &irq_cfg[irq].domain))
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continue;
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vector = irq_to_vector(irq);
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per_cpu(vector_irq, cpu)[vector] = irq;
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}
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}
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#ifdef CONFIG_SMP
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static enum vector_domain_type {
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VECTOR_DOMAIN_NONE,
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VECTOR_DOMAIN_PERCPU
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} vector_domain_type = VECTOR_DOMAIN_NONE;
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static cpumask_t vector_allocation_domain(int cpu)
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{
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if (vector_domain_type == VECTOR_DOMAIN_PERCPU)
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return *cpumask_of(cpu);
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return CPU_MASK_ALL;
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}
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static int __irq_prepare_move(int irq, int cpu)
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{
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struct irq_cfg *cfg = &irq_cfg[irq];
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int vector;
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cpumask_t domain;
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if (cfg->move_in_progress || cfg->move_cleanup_count)
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return -EBUSY;
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if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))
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return -EINVAL;
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if (cpumask_test_cpu(cpu, &cfg->domain))
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return 0;
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domain = vector_allocation_domain(cpu);
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vector = find_unassigned_vector(domain);
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if (vector < 0)
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return -ENOSPC;
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cfg->move_in_progress = 1;
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cfg->old_domain = cfg->domain;
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cfg->vector = IRQ_VECTOR_UNASSIGNED;
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cfg->domain = CPU_MASK_NONE;
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BUG_ON(__bind_irq_vector(irq, vector, domain));
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return 0;
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}
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int irq_prepare_move(int irq, int cpu)
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{
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&vector_lock, flags);
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ret = __irq_prepare_move(irq, cpu);
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spin_unlock_irqrestore(&vector_lock, flags);
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return ret;
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}
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void irq_complete_move(unsigned irq)
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{
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struct irq_cfg *cfg = &irq_cfg[irq];
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cpumask_t cleanup_mask;
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int i;
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if (likely(!cfg->move_in_progress))
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return;
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if (unlikely(cpumask_test_cpu(smp_processor_id(), &cfg->old_domain)))
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return;
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cpumask_and(&cleanup_mask, &cfg->old_domain, cpu_online_mask);
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cfg->move_cleanup_count = cpumask_weight(&cleanup_mask);
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for_each_cpu(i, &cleanup_mask)
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ia64_send_ipi(i, IA64_IRQ_MOVE_VECTOR, IA64_IPI_DM_INT, 0);
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cfg->move_in_progress = 0;
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}
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static irqreturn_t smp_irq_move_cleanup_interrupt(int irq, void *dev_id)
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{
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int me = smp_processor_id();
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ia64_vector vector;
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unsigned long flags;
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for (vector = IA64_FIRST_DEVICE_VECTOR;
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vector < IA64_LAST_DEVICE_VECTOR; vector++) {
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int irq;
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struct irq_desc *desc;
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struct irq_cfg *cfg;
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irq = __this_cpu_read(vector_irq[vector]);
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if (irq < 0)
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continue;
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desc = irq_to_desc(irq);
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cfg = irq_cfg + irq;
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raw_spin_lock(&desc->lock);
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if (!cfg->move_cleanup_count)
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goto unlock;
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if (!cpumask_test_cpu(me, &cfg->old_domain))
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goto unlock;
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spin_lock_irqsave(&vector_lock, flags);
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__this_cpu_write(vector_irq[vector], -1);
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cpumask_clear_cpu(me, &vector_table[vector]);
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spin_unlock_irqrestore(&vector_lock, flags);
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cfg->move_cleanup_count--;
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unlock:
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raw_spin_unlock(&desc->lock);
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}
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return IRQ_HANDLED;
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}
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static struct irqaction irq_move_irqaction = {
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.handler = smp_irq_move_cleanup_interrupt,
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.name = "irq_move"
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};
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static int __init parse_vector_domain(char *arg)
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{
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if (!arg)
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return -EINVAL;
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if (!strcmp(arg, "percpu")) {
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vector_domain_type = VECTOR_DOMAIN_PERCPU;
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no_int_routing = 1;
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}
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return 0;
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}
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early_param("vector", parse_vector_domain);
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#else
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static cpumask_t vector_allocation_domain(int cpu)
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{
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return CPU_MASK_ALL;
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}
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#endif
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void destroy_and_reserve_irq(unsigned int irq)
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{
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unsigned long flags;
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irq_init_desc(irq);
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spin_lock_irqsave(&vector_lock, flags);
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__clear_irq_vector(irq);
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irq_status[irq] = IRQ_RSVD;
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spin_unlock_irqrestore(&vector_lock, flags);
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}
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/*
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* Dynamic irq allocate and deallocation for MSI
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*/
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int create_irq(void)
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{
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unsigned long flags;
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int irq, vector, cpu;
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cpumask_t domain = CPU_MASK_NONE;
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irq = vector = -ENOSPC;
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spin_lock_irqsave(&vector_lock, flags);
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for_each_online_cpu(cpu) {
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domain = vector_allocation_domain(cpu);
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vector = find_unassigned_vector(domain);
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if (vector >= 0)
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break;
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}
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if (vector < 0)
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goto out;
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irq = find_unassigned_irq();
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if (irq < 0)
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goto out;
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BUG_ON(__bind_irq_vector(irq, vector, domain));
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out:
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spin_unlock_irqrestore(&vector_lock, flags);
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if (irq >= 0)
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irq_init_desc(irq);
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return irq;
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}
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void destroy_irq(unsigned int irq)
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{
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irq_init_desc(irq);
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clear_irq_vector(irq);
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}
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#ifdef CONFIG_SMP
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# define IS_RESCHEDULE(vec) (vec == IA64_IPI_RESCHEDULE)
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# define IS_LOCAL_TLB_FLUSH(vec) (vec == IA64_IPI_LOCAL_TLB_FLUSH)
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#else
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# define IS_RESCHEDULE(vec) (0)
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# define IS_LOCAL_TLB_FLUSH(vec) (0)
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#endif
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/*
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* That's where the IVT branches when we get an external
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* interrupt. This branches to the correct hardware IRQ handler via
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* function ptr.
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*/
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void
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ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
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{
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struct pt_regs *old_regs = set_irq_regs(regs);
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unsigned long saved_tpr;
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#if IRQ_DEBUG
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{
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unsigned long bsp, sp;
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/*
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* Note: if the interrupt happened while executing in
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* the context switch routine (ia64_switch_to), we may
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* get a spurious stack overflow here. This is
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* because the register and the memory stack are not
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* switched atomically.
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*/
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bsp = ia64_getreg(_IA64_REG_AR_BSP);
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sp = ia64_getreg(_IA64_REG_SP);
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if ((sp - bsp) < 1024) {
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static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
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if (__ratelimit(&ratelimit)) {
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printk("ia64_handle_irq: DANGER: less than "
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"1KB of free stack space!!\n"
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"(bsp=0x%lx, sp=%lx)\n", bsp, sp);
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}
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}
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}
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#endif /* IRQ_DEBUG */
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/*
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* Always set TPR to limit maximum interrupt nesting depth to
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* 16 (without this, it would be ~240, which could easily lead
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* to kernel stack overflows).
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*/
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irq_enter();
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saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
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ia64_srlz_d();
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while (vector != IA64_SPURIOUS_INT_VECTOR) {
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int irq = local_vector_to_irq(vector);
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if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
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smp_local_flush_tlb();
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kstat_incr_irq_this_cpu(irq);
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} else if (unlikely(IS_RESCHEDULE(vector))) {
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scheduler_ipi();
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kstat_incr_irq_this_cpu(irq);
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} else {
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ia64_setreg(_IA64_REG_CR_TPR, vector);
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ia64_srlz_d();
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if (unlikely(irq < 0)) {
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printk(KERN_ERR "%s: Unexpected interrupt "
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"vector %d on CPU %d is not mapped "
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"to any IRQ!\n", __func__, vector,
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smp_processor_id());
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} else
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generic_handle_irq(irq);
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/*
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* Disable interrupts and send EOI:
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*/
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local_irq_disable();
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ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
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}
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ia64_eoi();
|
|
vector = ia64_get_ivr();
|
|
}
|
|
/*
|
|
* This must be done *after* the ia64_eoi(). For example, the keyboard softirq
|
|
* handler needs to be able to wait for further keyboard interrupts, which can't
|
|
* come through until ia64_eoi() has been done.
|
|
*/
|
|
irq_exit();
|
|
set_irq_regs(old_regs);
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
/*
|
|
* This function emulates a interrupt processing when a cpu is about to be
|
|
* brought down.
|
|
*/
|
|
void ia64_process_pending_intr(void)
|
|
{
|
|
ia64_vector vector;
|
|
unsigned long saved_tpr;
|
|
extern unsigned int vectors_in_migration[NR_IRQS];
|
|
|
|
vector = ia64_get_ivr();
|
|
|
|
irq_enter();
|
|
saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
|
|
ia64_srlz_d();
|
|
|
|
/*
|
|
* Perform normal interrupt style processing
|
|
*/
|
|
while (vector != IA64_SPURIOUS_INT_VECTOR) {
|
|
int irq = local_vector_to_irq(vector);
|
|
|
|
if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
|
|
smp_local_flush_tlb();
|
|
kstat_incr_irq_this_cpu(irq);
|
|
} else if (unlikely(IS_RESCHEDULE(vector))) {
|
|
kstat_incr_irq_this_cpu(irq);
|
|
} else {
|
|
struct pt_regs *old_regs = set_irq_regs(NULL);
|
|
|
|
ia64_setreg(_IA64_REG_CR_TPR, vector);
|
|
ia64_srlz_d();
|
|
|
|
/*
|
|
* Now try calling normal ia64_handle_irq as it would have got called
|
|
* from a real intr handler. Try passing null for pt_regs, hopefully
|
|
* it will work. I hope it works!.
|
|
* Probably could shared code.
|
|
*/
|
|
if (unlikely(irq < 0)) {
|
|
printk(KERN_ERR "%s: Unexpected interrupt "
|
|
"vector %d on CPU %d not being mapped "
|
|
"to any IRQ!!\n", __func__, vector,
|
|
smp_processor_id());
|
|
} else {
|
|
vectors_in_migration[irq]=0;
|
|
generic_handle_irq(irq);
|
|
}
|
|
set_irq_regs(old_regs);
|
|
|
|
/*
|
|
* Disable interrupts and send EOI
|
|
*/
|
|
local_irq_disable();
|
|
ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
|
|
}
|
|
ia64_eoi();
|
|
vector = ia64_get_ivr();
|
|
}
|
|
irq_exit();
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
static irqreturn_t dummy_handler (int irq, void *dev_id)
|
|
{
|
|
BUG();
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
static struct irqaction ipi_irqaction = {
|
|
.handler = handle_IPI,
|
|
.name = "IPI"
|
|
};
|
|
|
|
/*
|
|
* KVM uses this interrupt to force a cpu out of guest mode
|
|
*/
|
|
static struct irqaction resched_irqaction = {
|
|
.handler = dummy_handler,
|
|
.name = "resched"
|
|
};
|
|
|
|
static struct irqaction tlb_irqaction = {
|
|
.handler = dummy_handler,
|
|
.name = "tlb_flush"
|
|
};
|
|
|
|
#endif
|
|
|
|
void
|
|
ia64_native_register_percpu_irq (ia64_vector vec, struct irqaction *action)
|
|
{
|
|
unsigned int irq;
|
|
|
|
irq = vec;
|
|
BUG_ON(bind_irq_vector(irq, vec, CPU_MASK_ALL));
|
|
irq_set_status_flags(irq, IRQ_PER_CPU);
|
|
irq_set_chip(irq, &irq_type_ia64_lsapic);
|
|
if (action)
|
|
setup_irq(irq, action);
|
|
irq_set_handler(irq, handle_percpu_irq);
|
|
}
|
|
|
|
void __init
|
|
ia64_native_register_ipi(void)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction);
|
|
register_percpu_irq(IA64_IPI_RESCHEDULE, &resched_irqaction);
|
|
register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &tlb_irqaction);
|
|
#endif
|
|
}
|
|
|
|
void __init
|
|
init_IRQ (void)
|
|
{
|
|
acpi_boot_init();
|
|
ia64_register_ipi();
|
|
register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL);
|
|
#ifdef CONFIG_SMP
|
|
if (vector_domain_type != VECTOR_DOMAIN_NONE)
|
|
register_percpu_irq(IA64_IRQ_MOVE_VECTOR, &irq_move_irqaction);
|
|
#endif
|
|
#ifdef CONFIG_PERFMON
|
|
pfm_init_percpu();
|
|
#endif
|
|
}
|
|
|
|
void
|
|
ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect)
|
|
{
|
|
void __iomem *ipi_addr;
|
|
unsigned long ipi_data;
|
|
unsigned long phys_cpu_id;
|
|
|
|
phys_cpu_id = cpu_physical_id(cpu);
|
|
|
|
/*
|
|
* cpu number is in 8bit ID and 8bit EID
|
|
*/
|
|
|
|
ipi_data = (delivery_mode << 8) | (vector & 0xff);
|
|
ipi_addr = ipi_base_addr + ((phys_cpu_id << 4) | ((redirect & 1) << 3));
|
|
|
|
writeq(ipi_data, ipi_addr);
|
|
}
|