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-rw-r--r--arch/s390/kernel/irq.c402
1 files changed, 402 insertions, 0 deletions
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
new file mode 100644
index 0000000000..b020ff17d2
--- /dev/null
+++ b/arch/s390/kernel/irq.c
@@ -0,0 +1,402 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright IBM Corp. 2004, 2011
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
+ * Holger Smolinski <Holger.Smolinski@de.ibm.com>,
+ * Thomas Spatzier <tspat@de.ibm.com>,
+ *
+ * This file contains interrupt related functions.
+ */
+
+#include <linux/kernel_stat.h>
+#include <linux/interrupt.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+#include <linux/profile.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/ftrace.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/cpu.h>
+#include <linux/irq.h>
+#include <linux/entry-common.h>
+#include <asm/irq_regs.h>
+#include <asm/cputime.h>
+#include <asm/lowcore.h>
+#include <asm/irq.h>
+#include <asm/hw_irq.h>
+#include <asm/stacktrace.h>
+#include <asm/softirq_stack.h>
+#include "entry.h"
+
+DEFINE_PER_CPU_SHARED_ALIGNED(struct irq_stat, irq_stat);
+EXPORT_PER_CPU_SYMBOL_GPL(irq_stat);
+
+struct irq_class {
+ int irq;
+ char *name;
+ char *desc;
+};
+
+/*
+ * The list of "main" irq classes on s390. This is the list of interrupts
+ * that appear both in /proc/stat ("intr" line) and /proc/interrupts.
+ * Historically only external and I/O interrupts have been part of /proc/stat.
+ * We can't add the split external and I/O sub classes since the first field
+ * in the "intr" line in /proc/stat is supposed to be the sum of all other
+ * fields.
+ * Since the external and I/O interrupt fields are already sums we would end
+ * up with having a sum which accounts each interrupt twice.
+ */
+static const struct irq_class irqclass_main_desc[NR_IRQS_BASE] = {
+ {.irq = EXT_INTERRUPT, .name = "EXT"},
+ {.irq = IO_INTERRUPT, .name = "I/O"},
+ {.irq = THIN_INTERRUPT, .name = "AIO"},
+};
+
+/*
+ * The list of split external and I/O interrupts that appear only in
+ * /proc/interrupts.
+ * In addition this list contains non external / I/O events like NMIs.
+ */
+static const struct irq_class irqclass_sub_desc[] = {
+ {.irq = IRQEXT_CLK, .name = "CLK", .desc = "[EXT] Clock Comparator"},
+ {.irq = IRQEXT_EXC, .name = "EXC", .desc = "[EXT] External Call"},
+ {.irq = IRQEXT_EMS, .name = "EMS", .desc = "[EXT] Emergency Signal"},
+ {.irq = IRQEXT_TMR, .name = "TMR", .desc = "[EXT] CPU Timer"},
+ {.irq = IRQEXT_TLA, .name = "TAL", .desc = "[EXT] Timing Alert"},
+ {.irq = IRQEXT_PFL, .name = "PFL", .desc = "[EXT] Pseudo Page Fault"},
+ {.irq = IRQEXT_DSD, .name = "DSD", .desc = "[EXT] DASD Diag"},
+ {.irq = IRQEXT_VRT, .name = "VRT", .desc = "[EXT] Virtio"},
+ {.irq = IRQEXT_SCP, .name = "SCP", .desc = "[EXT] Service Call"},
+ {.irq = IRQEXT_IUC, .name = "IUC", .desc = "[EXT] IUCV"},
+ {.irq = IRQEXT_CMS, .name = "CMS", .desc = "[EXT] CPU-Measurement: Sampling"},
+ {.irq = IRQEXT_CMC, .name = "CMC", .desc = "[EXT] CPU-Measurement: Counter"},
+ {.irq = IRQEXT_FTP, .name = "FTP", .desc = "[EXT] HMC FTP Service"},
+ {.irq = IRQIO_CIO, .name = "CIO", .desc = "[I/O] Common I/O Layer Interrupt"},
+ {.irq = IRQIO_DAS, .name = "DAS", .desc = "[I/O] DASD"},
+ {.irq = IRQIO_C15, .name = "C15", .desc = "[I/O] 3215"},
+ {.irq = IRQIO_C70, .name = "C70", .desc = "[I/O] 3270"},
+ {.irq = IRQIO_TAP, .name = "TAP", .desc = "[I/O] Tape"},
+ {.irq = IRQIO_VMR, .name = "VMR", .desc = "[I/O] Unit Record Devices"},
+ {.irq = IRQIO_LCS, .name = "LCS", .desc = "[I/O] LCS"},
+ {.irq = IRQIO_CTC, .name = "CTC", .desc = "[I/O] CTC"},
+ {.irq = IRQIO_ADM, .name = "ADM", .desc = "[I/O] EADM Subchannel"},
+ {.irq = IRQIO_CSC, .name = "CSC", .desc = "[I/O] CHSC Subchannel"},
+ {.irq = IRQIO_VIR, .name = "VIR", .desc = "[I/O] Virtual I/O Devices"},
+ {.irq = IRQIO_QAI, .name = "QAI", .desc = "[AIO] QDIO Adapter Interrupt"},
+ {.irq = IRQIO_APB, .name = "APB", .desc = "[AIO] AP Bus"},
+ {.irq = IRQIO_PCF, .name = "PCF", .desc = "[AIO] PCI Floating Interrupt"},
+ {.irq = IRQIO_PCD, .name = "PCD", .desc = "[AIO] PCI Directed Interrupt"},
+ {.irq = IRQIO_MSI, .name = "MSI", .desc = "[AIO] MSI Interrupt"},
+ {.irq = IRQIO_VAI, .name = "VAI", .desc = "[AIO] Virtual I/O Devices AI"},
+ {.irq = IRQIO_GAL, .name = "GAL", .desc = "[AIO] GIB Alert"},
+ {.irq = NMI_NMI, .name = "NMI", .desc = "[NMI] Machine Check"},
+ {.irq = CPU_RST, .name = "RST", .desc = "[CPU] CPU Restart"},
+};
+
+static void do_IRQ(struct pt_regs *regs, int irq)
+{
+ if (tod_after_eq(S390_lowcore.int_clock,
+ S390_lowcore.clock_comparator))
+ /* Serve timer interrupts first. */
+ clock_comparator_work();
+ generic_handle_irq(irq);
+}
+
+static int on_async_stack(void)
+{
+ unsigned long frame = current_frame_address();
+
+ return ((S390_lowcore.async_stack ^ frame) & ~(THREAD_SIZE - 1)) == 0;
+}
+
+static void do_irq_async(struct pt_regs *regs, int irq)
+{
+ if (on_async_stack()) {
+ do_IRQ(regs, irq);
+ } else {
+ call_on_stack(2, S390_lowcore.async_stack, void, do_IRQ,
+ struct pt_regs *, regs, int, irq);
+ }
+}
+
+static int irq_pending(struct pt_regs *regs)
+{
+ int cc;
+
+ asm volatile("tpi 0\n"
+ "ipm %0" : "=d" (cc) : : "cc");
+ return cc >> 28;
+}
+
+void noinstr do_io_irq(struct pt_regs *regs)
+{
+ irqentry_state_t state = irqentry_enter(regs);
+ struct pt_regs *old_regs = set_irq_regs(regs);
+ bool from_idle;
+
+ irq_enter_rcu();
+
+ if (user_mode(regs)) {
+ update_timer_sys();
+ if (static_branch_likely(&cpu_has_bear))
+ current->thread.last_break = regs->last_break;
+ }
+
+ from_idle = test_and_clear_cpu_flag(CIF_ENABLED_WAIT);
+ if (from_idle)
+ account_idle_time_irq();
+
+ do {
+ regs->tpi_info = S390_lowcore.tpi_info;
+ if (S390_lowcore.tpi_info.adapter_IO)
+ do_irq_async(regs, THIN_INTERRUPT);
+ else
+ do_irq_async(regs, IO_INTERRUPT);
+ } while (MACHINE_IS_LPAR && irq_pending(regs));
+
+ irq_exit_rcu();
+
+ set_irq_regs(old_regs);
+ irqentry_exit(regs, state);
+
+ if (from_idle)
+ regs->psw.mask &= ~(PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_WAIT);
+}
+
+void noinstr do_ext_irq(struct pt_regs *regs)
+{
+ irqentry_state_t state = irqentry_enter(regs);
+ struct pt_regs *old_regs = set_irq_regs(regs);
+ bool from_idle;
+
+ irq_enter_rcu();
+
+ if (user_mode(regs)) {
+ update_timer_sys();
+ if (static_branch_likely(&cpu_has_bear))
+ current->thread.last_break = regs->last_break;
+ }
+
+ regs->int_code = S390_lowcore.ext_int_code_addr;
+ regs->int_parm = S390_lowcore.ext_params;
+ regs->int_parm_long = S390_lowcore.ext_params2;
+
+ from_idle = test_and_clear_cpu_flag(CIF_ENABLED_WAIT);
+ if (from_idle)
+ account_idle_time_irq();
+
+ do_irq_async(regs, EXT_INTERRUPT);
+
+ irq_exit_rcu();
+ set_irq_regs(old_regs);
+ irqentry_exit(regs, state);
+
+ if (from_idle)
+ regs->psw.mask &= ~(PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_WAIT);
+}
+
+static void show_msi_interrupt(struct seq_file *p, int irq)
+{
+ struct irq_desc *desc;
+ unsigned long flags;
+ int cpu;
+
+ rcu_read_lock();
+ desc = irq_to_desc(irq);
+ if (!desc)
+ goto out;
+
+ raw_spin_lock_irqsave(&desc->lock, flags);
+ seq_printf(p, "%3d: ", irq);
+ for_each_online_cpu(cpu)
+ seq_printf(p, "%10u ", irq_desc_kstat_cpu(desc, cpu));
+
+ if (desc->irq_data.chip)
+ seq_printf(p, " %8s", desc->irq_data.chip->name);
+
+ if (desc->action)
+ seq_printf(p, " %s", desc->action->name);
+
+ seq_putc(p, '\n');
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
+out:
+ rcu_read_unlock();
+}
+
+/*
+ * show_interrupts is needed by /proc/interrupts.
+ */
+int show_interrupts(struct seq_file *p, void *v)
+{
+ int index = *(loff_t *) v;
+ int cpu, irq;
+
+ cpus_read_lock();
+ if (index == 0) {
+ seq_puts(p, " ");
+ for_each_online_cpu(cpu)
+ seq_printf(p, "CPU%-8d", cpu);
+ seq_putc(p, '\n');
+ }
+ if (index < NR_IRQS_BASE) {
+ seq_printf(p, "%s: ", irqclass_main_desc[index].name);
+ irq = irqclass_main_desc[index].irq;
+ for_each_online_cpu(cpu)
+ seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
+ seq_putc(p, '\n');
+ goto out;
+ }
+ if (index < nr_irqs) {
+ show_msi_interrupt(p, index);
+ goto out;
+ }
+ for (index = 0; index < NR_ARCH_IRQS; index++) {
+ seq_printf(p, "%s: ", irqclass_sub_desc[index].name);
+ irq = irqclass_sub_desc[index].irq;
+ for_each_online_cpu(cpu)
+ seq_printf(p, "%10u ",
+ per_cpu(irq_stat, cpu).irqs[irq]);
+ if (irqclass_sub_desc[index].desc)
+ seq_printf(p, " %s", irqclass_sub_desc[index].desc);
+ seq_putc(p, '\n');
+ }
+out:
+ cpus_read_unlock();
+ return 0;
+}
+
+unsigned int arch_dynirq_lower_bound(unsigned int from)
+{
+ return from < NR_IRQS_BASE ? NR_IRQS_BASE : from;
+}
+
+/*
+ * ext_int_hash[index] is the list head for all external interrupts that hash
+ * to this index.
+ */
+static struct hlist_head ext_int_hash[32] ____cacheline_aligned;
+
+struct ext_int_info {
+ ext_int_handler_t handler;
+ struct hlist_node entry;
+ struct rcu_head rcu;
+ u16 code;
+};
+
+/* ext_int_hash_lock protects the handler lists for external interrupts */
+static DEFINE_SPINLOCK(ext_int_hash_lock);
+
+static inline int ext_hash(u16 code)
+{
+ BUILD_BUG_ON(!is_power_of_2(ARRAY_SIZE(ext_int_hash)));
+
+ return (code + (code >> 9)) & (ARRAY_SIZE(ext_int_hash) - 1);
+}
+
+int register_external_irq(u16 code, ext_int_handler_t handler)
+{
+ struct ext_int_info *p;
+ unsigned long flags;
+ int index;
+
+ p = kmalloc(sizeof(*p), GFP_ATOMIC);
+ if (!p)
+ return -ENOMEM;
+ p->code = code;
+ p->handler = handler;
+ index = ext_hash(code);
+
+ spin_lock_irqsave(&ext_int_hash_lock, flags);
+ hlist_add_head_rcu(&p->entry, &ext_int_hash[index]);
+ spin_unlock_irqrestore(&ext_int_hash_lock, flags);
+ return 0;
+}
+EXPORT_SYMBOL(register_external_irq);
+
+int unregister_external_irq(u16 code, ext_int_handler_t handler)
+{
+ struct ext_int_info *p;
+ unsigned long flags;
+ int index = ext_hash(code);
+
+ spin_lock_irqsave(&ext_int_hash_lock, flags);
+ hlist_for_each_entry_rcu(p, &ext_int_hash[index], entry) {
+ if (p->code == code && p->handler == handler) {
+ hlist_del_rcu(&p->entry);
+ kfree_rcu(p, rcu);
+ }
+ }
+ spin_unlock_irqrestore(&ext_int_hash_lock, flags);
+ return 0;
+}
+EXPORT_SYMBOL(unregister_external_irq);
+
+static irqreturn_t do_ext_interrupt(int irq, void *dummy)
+{
+ struct pt_regs *regs = get_irq_regs();
+ struct ext_code ext_code;
+ struct ext_int_info *p;
+ int index;
+
+ ext_code.int_code = regs->int_code;
+ if (ext_code.code != EXT_IRQ_CLK_COMP)
+ set_cpu_flag(CIF_NOHZ_DELAY);
+
+ index = ext_hash(ext_code.code);
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(p, &ext_int_hash[index], entry) {
+ if (unlikely(p->code != ext_code.code))
+ continue;
+ p->handler(ext_code, regs->int_parm, regs->int_parm_long);
+ }
+ rcu_read_unlock();
+ return IRQ_HANDLED;
+}
+
+static void __init init_ext_interrupts(void)
+{
+ int idx;
+
+ for (idx = 0; idx < ARRAY_SIZE(ext_int_hash); idx++)
+ INIT_HLIST_HEAD(&ext_int_hash[idx]);
+
+ irq_set_chip_and_handler(EXT_INTERRUPT,
+ &dummy_irq_chip, handle_percpu_irq);
+ if (request_irq(EXT_INTERRUPT, do_ext_interrupt, 0, "EXT", NULL))
+ panic("Failed to register EXT interrupt\n");
+}
+
+void __init init_IRQ(void)
+{
+ BUILD_BUG_ON(ARRAY_SIZE(irqclass_sub_desc) != NR_ARCH_IRQS);
+ init_cio_interrupts();
+ init_airq_interrupts();
+ init_ext_interrupts();
+}
+
+static DEFINE_SPINLOCK(irq_subclass_lock);
+static unsigned char irq_subclass_refcount[64];
+
+void irq_subclass_register(enum irq_subclass subclass)
+{
+ spin_lock(&irq_subclass_lock);
+ if (!irq_subclass_refcount[subclass])
+ ctl_set_bit(0, subclass);
+ irq_subclass_refcount[subclass]++;
+ spin_unlock(&irq_subclass_lock);
+}
+EXPORT_SYMBOL(irq_subclass_register);
+
+void irq_subclass_unregister(enum irq_subclass subclass)
+{
+ spin_lock(&irq_subclass_lock);
+ irq_subclass_refcount[subclass]--;
+ if (!irq_subclass_refcount[subclass])
+ ctl_clear_bit(0, subclass);
+ spin_unlock(&irq_subclass_lock);
+}
+EXPORT_SYMBOL(irq_subclass_unregister);