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-rw-r--r--arch/ia64/kernel/irq_ia64.c645
1 files changed, 645 insertions, 0 deletions
diff --git a/arch/ia64/kernel/irq_ia64.c b/arch/ia64/kernel/irq_ia64.c
new file mode 100644
index 000000000..46e33c5cb
--- /dev/null
+++ b/arch/ia64/kernel/irq_ia64.c
@@ -0,0 +1,645 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/arch/ia64/kernel/irq_ia64.c
+ *
+ * Copyright (C) 1998-2001 Hewlett-Packard Co
+ * Stephane Eranian <eranian@hpl.hp.com>
+ * David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * 6/10/99: Updated to bring in sync with x86 version to facilitate
+ * support for SMP and different interrupt controllers.
+ *
+ * 09/15/00 Goutham Rao <goutham.rao@intel.com> Implemented pci_irq_to_vector
+ * PCI to vector allocation routine.
+ * 04/14/2004 Ashok Raj <ashok.raj@intel.com>
+ * Added CPU Hotplug handling for IPF.
+ */
+
+#include <linux/module.h>
+#include <linux/pgtable.h>
+
+#include <linux/jiffies.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/kernel_stat.h>
+#include <linux/ptrace.h>
+#include <linux/signal.h>
+#include <linux/smp.h>
+#include <linux/threads.h>
+#include <linux/bitops.h>
+#include <linux/irq.h>
+#include <linux/ratelimit.h>
+#include <linux/acpi.h>
+#include <linux/sched.h>
+
+#include <asm/delay.h>
+#include <asm/intrinsics.h>
+#include <asm/io.h>
+#include <asm/hw_irq.h>
+#include <asm/tlbflush.h>
+
+#define IRQ_DEBUG 0
+
+#define IRQ_VECTOR_UNASSIGNED (0)
+
+#define IRQ_UNUSED (0)
+#define IRQ_USED (1)
+#define IRQ_RSVD (2)
+
+int ia64_first_device_vector = IA64_DEF_FIRST_DEVICE_VECTOR;
+int ia64_last_device_vector = IA64_DEF_LAST_DEVICE_VECTOR;
+
+/* default base addr of IPI table */
+void __iomem *ipi_base_addr = ((void __iomem *)
+ (__IA64_UNCACHED_OFFSET | IA64_IPI_DEFAULT_BASE_ADDR));
+
+static cpumask_t vector_allocation_domain(int cpu);
+
+/*
+ * Legacy IRQ to IA-64 vector translation table.
+ */
+__u8 isa_irq_to_vector_map[16] = {
+ /* 8259 IRQ translation, first 16 entries */
+ 0x2f, 0x20, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x29,
+ 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21
+};
+EXPORT_SYMBOL(isa_irq_to_vector_map);
+
+DEFINE_SPINLOCK(vector_lock);
+
+struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
+ [0 ... NR_IRQS - 1] = {
+ .vector = IRQ_VECTOR_UNASSIGNED,
+ .domain = CPU_MASK_NONE
+ }
+};
+
+DEFINE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq) = {
+ [0 ... IA64_NUM_VECTORS - 1] = -1
+};
+
+static cpumask_t vector_table[IA64_NUM_VECTORS] = {
+ [0 ... IA64_NUM_VECTORS - 1] = CPU_MASK_NONE
+};
+
+static int irq_status[NR_IRQS] = {
+ [0 ... NR_IRQS -1] = IRQ_UNUSED
+};
+
+static inline int find_unassigned_irq(void)
+{
+ int irq;
+
+ for (irq = IA64_FIRST_DEVICE_VECTOR; irq < NR_IRQS; irq++)
+ if (irq_status[irq] == IRQ_UNUSED)
+ return irq;
+ return -ENOSPC;
+}
+
+static inline int find_unassigned_vector(cpumask_t domain)
+{
+ cpumask_t mask;
+ int pos, vector;
+
+ cpumask_and(&mask, &domain, cpu_online_mask);
+ if (cpumask_empty(&mask))
+ return -EINVAL;
+
+ for (pos = 0; pos < IA64_NUM_DEVICE_VECTORS; pos++) {
+ vector = IA64_FIRST_DEVICE_VECTOR + pos;
+ cpumask_and(&mask, &domain, &vector_table[vector]);
+ if (!cpumask_empty(&mask))
+ continue;
+ return vector;
+ }
+ return -ENOSPC;
+}
+
+static int __bind_irq_vector(int irq, int vector, cpumask_t domain)
+{
+ cpumask_t mask;
+ int cpu;
+ struct irq_cfg *cfg = &irq_cfg[irq];
+
+ BUG_ON((unsigned)irq >= NR_IRQS);
+ BUG_ON((unsigned)vector >= IA64_NUM_VECTORS);
+
+ cpumask_and(&mask, &domain, cpu_online_mask);
+ if (cpumask_empty(&mask))
+ return -EINVAL;
+ if ((cfg->vector == vector) && cpumask_equal(&cfg->domain, &domain))
+ return 0;
+ if (cfg->vector != IRQ_VECTOR_UNASSIGNED)
+ return -EBUSY;
+ for_each_cpu(cpu, &mask)
+ per_cpu(vector_irq, cpu)[vector] = irq;
+ cfg->vector = vector;
+ cfg->domain = domain;
+ irq_status[irq] = IRQ_USED;
+ cpumask_or(&vector_table[vector], &vector_table[vector], &domain);
+ return 0;
+}
+
+int bind_irq_vector(int irq, int vector, cpumask_t domain)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ ret = __bind_irq_vector(irq, vector, domain);
+ spin_unlock_irqrestore(&vector_lock, flags);
+ return ret;
+}
+
+static void __clear_irq_vector(int irq)
+{
+ int vector, cpu;
+ cpumask_t domain;
+ struct irq_cfg *cfg = &irq_cfg[irq];
+
+ BUG_ON((unsigned)irq >= NR_IRQS);
+ BUG_ON(cfg->vector == IRQ_VECTOR_UNASSIGNED);
+ vector = cfg->vector;
+ domain = cfg->domain;
+ for_each_cpu_and(cpu, &cfg->domain, cpu_online_mask)
+ per_cpu(vector_irq, cpu)[vector] = -1;
+ cfg->vector = IRQ_VECTOR_UNASSIGNED;
+ cfg->domain = CPU_MASK_NONE;
+ irq_status[irq] = IRQ_UNUSED;
+ cpumask_andnot(&vector_table[vector], &vector_table[vector], &domain);
+}
+
+static void clear_irq_vector(int irq)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ __clear_irq_vector(irq);
+ spin_unlock_irqrestore(&vector_lock, flags);
+}
+
+int
+ia64_native_assign_irq_vector (int irq)
+{
+ unsigned long flags;
+ int vector, cpu;
+ cpumask_t domain = CPU_MASK_NONE;
+
+ vector = -ENOSPC;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ for_each_online_cpu(cpu) {
+ domain = vector_allocation_domain(cpu);
+ vector = find_unassigned_vector(domain);
+ if (vector >= 0)
+ break;
+ }
+ if (vector < 0)
+ goto out;
+ if (irq == AUTO_ASSIGN)
+ irq = vector;
+ BUG_ON(__bind_irq_vector(irq, vector, domain));
+ out:
+ spin_unlock_irqrestore(&vector_lock, flags);
+ return vector;
+}
+
+void
+ia64_native_free_irq_vector (int vector)
+{
+ if (vector < IA64_FIRST_DEVICE_VECTOR ||
+ vector > IA64_LAST_DEVICE_VECTOR)
+ return;
+ clear_irq_vector(vector);
+}
+
+int
+reserve_irq_vector (int vector)
+{
+ if (vector < IA64_FIRST_DEVICE_VECTOR ||
+ vector > IA64_LAST_DEVICE_VECTOR)
+ return -EINVAL;
+ return !!bind_irq_vector(vector, vector, CPU_MASK_ALL);
+}
+
+/*
+ * Initialize vector_irq on a new cpu. This function must be called
+ * with vector_lock held.
+ */
+void __setup_vector_irq(int cpu)
+{
+ int irq, vector;
+
+ /* Clear vector_irq */
+ for (vector = 0; vector < IA64_NUM_VECTORS; ++vector)
+ per_cpu(vector_irq, cpu)[vector] = -1;
+ /* Mark the inuse vectors */
+ for (irq = 0; irq < NR_IRQS; ++irq) {
+ if (!cpumask_test_cpu(cpu, &irq_cfg[irq].domain))
+ continue;
+ vector = irq_to_vector(irq);
+ per_cpu(vector_irq, cpu)[vector] = irq;
+ }
+}
+
+#ifdef CONFIG_SMP
+
+static enum vector_domain_type {
+ VECTOR_DOMAIN_NONE,
+ VECTOR_DOMAIN_PERCPU
+} vector_domain_type = VECTOR_DOMAIN_NONE;
+
+static cpumask_t vector_allocation_domain(int cpu)
+{
+ if (vector_domain_type == VECTOR_DOMAIN_PERCPU)
+ return *cpumask_of(cpu);
+ return CPU_MASK_ALL;
+}
+
+static int __irq_prepare_move(int irq, int cpu)
+{
+ struct irq_cfg *cfg = &irq_cfg[irq];
+ int vector;
+ cpumask_t domain;
+
+ if (cfg->move_in_progress || cfg->move_cleanup_count)
+ return -EBUSY;
+ if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))
+ return -EINVAL;
+ if (cpumask_test_cpu(cpu, &cfg->domain))
+ return 0;
+ domain = vector_allocation_domain(cpu);
+ vector = find_unassigned_vector(domain);
+ if (vector < 0)
+ return -ENOSPC;
+ cfg->move_in_progress = 1;
+ cfg->old_domain = cfg->domain;
+ cfg->vector = IRQ_VECTOR_UNASSIGNED;
+ cfg->domain = CPU_MASK_NONE;
+ BUG_ON(__bind_irq_vector(irq, vector, domain));
+ return 0;
+}
+
+int irq_prepare_move(int irq, int cpu)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ ret = __irq_prepare_move(irq, cpu);
+ spin_unlock_irqrestore(&vector_lock, flags);
+ return ret;
+}
+
+void irq_complete_move(unsigned irq)
+{
+ struct irq_cfg *cfg = &irq_cfg[irq];
+ cpumask_t cleanup_mask;
+ int i;
+
+ if (likely(!cfg->move_in_progress))
+ return;
+
+ if (unlikely(cpumask_test_cpu(smp_processor_id(), &cfg->old_domain)))
+ return;
+
+ cpumask_and(&cleanup_mask, &cfg->old_domain, cpu_online_mask);
+ cfg->move_cleanup_count = cpumask_weight(&cleanup_mask);
+ for_each_cpu(i, &cleanup_mask)
+ ia64_send_ipi(i, IA64_IRQ_MOVE_VECTOR, IA64_IPI_DM_INT, 0);
+ cfg->move_in_progress = 0;
+}
+
+static irqreturn_t smp_irq_move_cleanup_interrupt(int irq, void *dev_id)
+{
+ int me = smp_processor_id();
+ ia64_vector vector;
+ unsigned long flags;
+
+ for (vector = IA64_FIRST_DEVICE_VECTOR;
+ vector < IA64_LAST_DEVICE_VECTOR; vector++) {
+ int irq;
+ struct irq_desc *desc;
+ struct irq_cfg *cfg;
+ irq = __this_cpu_read(vector_irq[vector]);
+ if (irq < 0)
+ continue;
+
+ desc = irq_to_desc(irq);
+ cfg = irq_cfg + irq;
+ raw_spin_lock(&desc->lock);
+ if (!cfg->move_cleanup_count)
+ goto unlock;
+
+ if (!cpumask_test_cpu(me, &cfg->old_domain))
+ goto unlock;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ __this_cpu_write(vector_irq[vector], -1);
+ cpumask_clear_cpu(me, &vector_table[vector]);
+ spin_unlock_irqrestore(&vector_lock, flags);
+ cfg->move_cleanup_count--;
+ unlock:
+ raw_spin_unlock(&desc->lock);
+ }
+ return IRQ_HANDLED;
+}
+
+static int __init parse_vector_domain(char *arg)
+{
+ if (!arg)
+ return -EINVAL;
+ if (!strcmp(arg, "percpu")) {
+ vector_domain_type = VECTOR_DOMAIN_PERCPU;
+ no_int_routing = 1;
+ }
+ return 0;
+}
+early_param("vector", parse_vector_domain);
+#else
+static cpumask_t vector_allocation_domain(int cpu)
+{
+ return CPU_MASK_ALL;
+}
+#endif
+
+
+void destroy_and_reserve_irq(unsigned int irq)
+{
+ unsigned long flags;
+
+ irq_init_desc(irq);
+ spin_lock_irqsave(&vector_lock, flags);
+ __clear_irq_vector(irq);
+ irq_status[irq] = IRQ_RSVD;
+ spin_unlock_irqrestore(&vector_lock, flags);
+}
+
+/*
+ * Dynamic irq allocate and deallocation for MSI
+ */
+int create_irq(void)
+{
+ unsigned long flags;
+ int irq, vector, cpu;
+ cpumask_t domain = CPU_MASK_NONE;
+
+ irq = vector = -ENOSPC;
+ spin_lock_irqsave(&vector_lock, flags);
+ for_each_online_cpu(cpu) {
+ domain = vector_allocation_domain(cpu);
+ vector = find_unassigned_vector(domain);
+ if (vector >= 0)
+ break;
+ }
+ if (vector < 0)
+ goto out;
+ irq = find_unassigned_irq();
+ if (irq < 0)
+ goto out;
+ BUG_ON(__bind_irq_vector(irq, vector, domain));
+ out:
+ spin_unlock_irqrestore(&vector_lock, flags);
+ if (irq >= 0)
+ irq_init_desc(irq);
+ return irq;
+}
+
+void destroy_irq(unsigned int irq)
+{
+ irq_init_desc(irq);
+ clear_irq_vector(irq);
+}
+
+#ifdef CONFIG_SMP
+# define IS_RESCHEDULE(vec) (vec == IA64_IPI_RESCHEDULE)
+# define IS_LOCAL_TLB_FLUSH(vec) (vec == IA64_IPI_LOCAL_TLB_FLUSH)
+#else
+# define IS_RESCHEDULE(vec) (0)
+# define IS_LOCAL_TLB_FLUSH(vec) (0)
+#endif
+/*
+ * That's where the IVT branches when we get an external
+ * interrupt. This branches to the correct hardware IRQ handler via
+ * function ptr.
+ */
+void
+ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
+{
+ struct pt_regs *old_regs = set_irq_regs(regs);
+ unsigned long saved_tpr;
+
+#if IRQ_DEBUG
+ {
+ unsigned long bsp, sp;
+
+ /*
+ * Note: if the interrupt happened while executing in
+ * the context switch routine (ia64_switch_to), we may
+ * get a spurious stack overflow here. This is
+ * because the register and the memory stack are not
+ * switched atomically.
+ */
+ bsp = ia64_getreg(_IA64_REG_AR_BSP);
+ sp = ia64_getreg(_IA64_REG_SP);
+
+ if ((sp - bsp) < 1024) {
+ static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
+
+ if (__ratelimit(&ratelimit)) {
+ printk("ia64_handle_irq: DANGER: less than "
+ "1KB of free stack space!!\n"
+ "(bsp=0x%lx, sp=%lx)\n", bsp, sp);
+ }
+ }
+ }
+#endif /* IRQ_DEBUG */
+
+ /*
+ * Always set TPR to limit maximum interrupt nesting depth to
+ * 16 (without this, it would be ~240, which could easily lead
+ * to kernel stack overflows).
+ */
+ irq_enter();
+ saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
+ ia64_srlz_d();
+ 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))) {
+ scheduler_ipi();
+ kstat_incr_irq_this_cpu(irq);
+ } else {
+ ia64_setreg(_IA64_REG_CR_TPR, vector);
+ ia64_srlz_d();
+
+ if (unlikely(irq < 0)) {
+ printk(KERN_ERR "%s: Unexpected interrupt "
+ "vector %d on CPU %d is not mapped "
+ "to any IRQ!\n", __func__, vector,
+ smp_processor_id());
+ } else
+ generic_handle_irq(irq);
+
+ /*
+ * Disable interrupts and send EOI:
+ */
+ local_irq_disable();
+ ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
+ }
+ 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;
+}
+
+/*
+ * KVM uses this interrupt to force a cpu out of guest mode
+ */
+
+#endif
+
+void
+register_percpu_irq(ia64_vector vec, irq_handler_t handler, unsigned long flags,
+ const char *name)
+{
+ 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 (handler)
+ if (request_irq(irq, handler, flags, name, NULL))
+ pr_err("Failed to request irq %u (%s)\n", irq, name);
+ irq_set_handler(irq, handle_percpu_irq);
+}
+
+void __init
+ia64_native_register_ipi(void)
+{
+#ifdef CONFIG_SMP
+ register_percpu_irq(IA64_IPI_VECTOR, handle_IPI, 0, "IPI");
+ register_percpu_irq(IA64_IPI_RESCHEDULE, dummy_handler, 0, "resched");
+ register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, dummy_handler, 0,
+ "tlb_flush");
+#endif
+}
+
+void __init
+init_IRQ (void)
+{
+ acpi_boot_init();
+ ia64_register_ipi();
+ register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL, 0, NULL);
+#ifdef CONFIG_SMP
+ if (vector_domain_type != VECTOR_DOMAIN_NONE) {
+ register_percpu_irq(IA64_IRQ_MOVE_VECTOR,
+ smp_irq_move_cleanup_interrupt, 0,
+ "irq_move");
+ }
+#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);
+}
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