From: Catalin Marinas <catalin.marinas@arm.com>
To: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Marc Zyngier <marc.zyngier@arm.com>,
Will Deacon <will.deacon@arm.com>
Subject: [PATCH v2 11/31] arm64: IRQ handling
Date: Tue, 14 Aug 2012 18:52:12 +0100 [thread overview]
Message-ID: <1344966752-16102-12-git-send-email-catalin.marinas@arm.com> (raw)
In-Reply-To: <1344966752-16102-1-git-send-email-catalin.marinas@arm.com>
From: Marc Zyngier <marc.zyngier@arm.com>
This patch adds the support for IRQ handling. The actual interrupt
controller will be part of a separate patch (going into
drivers/irqchip/).
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
arch/arm64/include/asm/hardirq.h | 47 +++++++++++++++++++
arch/arm64/include/asm/irq.h | 8 +++
arch/arm64/include/asm/irqflags.h | 91 +++++++++++++++++++++++++++++++++++++
arch/arm64/kernel/irq.c | 84 ++++++++++++++++++++++++++++++++++
4 files changed, 230 insertions(+), 0 deletions(-)
create mode 100644 arch/arm64/include/asm/hardirq.h
create mode 100644 arch/arm64/include/asm/irq.h
create mode 100644 arch/arm64/include/asm/irqflags.h
create mode 100644 arch/arm64/kernel/irq.c
diff --git a/arch/arm64/include/asm/hardirq.h b/arch/arm64/include/asm/hardirq.h
new file mode 100644
index 0000000..c6c9514
--- /dev/null
+++ b/arch/arm64/include/asm/hardirq.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_HARDIRQ_H
+#define __ASM_HARDIRQ_H
+
+#include <linux/cache.h>
+#include <linux/threads.h>
+#include <asm/irq.h>
+
+typedef struct {
+ unsigned int __softirq_pending;
+} ____cacheline_aligned irq_cpustat_t;
+
+#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
+
+#define __inc_irq_stat(cpu, member) __IRQ_STAT(cpu, member)++
+#define __get_irq_stat(cpu, member) __IRQ_STAT(cpu, member)
+
+#ifdef CONFIG_SMP
+u64 smp_irq_stat_cpu(unsigned int cpu);
+#define arch_irq_stat_cpu smp_irq_stat_cpu
+#endif
+
+#define __ARCH_IRQ_EXIT_IRQS_DISABLED 1
+
+static inline void ack_bad_irq(unsigned int irq)
+{
+ extern unsigned long irq_err_count;
+ irq_err_count++;
+}
+
+extern void handle_IRQ(unsigned int, struct pt_regs *);
+
+#endif /* __ASM_HARDIRQ_H */
diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h
new file mode 100644
index 0000000..a4e1cad
--- /dev/null
+++ b/arch/arm64/include/asm/irq.h
@@ -0,0 +1,8 @@
+#ifndef __ASM_IRQ_H
+#define __ASM_IRQ_H
+
+#include <asm-generic/irq.h>
+
+extern void (*handle_arch_irq)(struct pt_regs *);
+
+#endif
diff --git a/arch/arm64/include/asm/irqflags.h b/arch/arm64/include/asm/irqflags.h
new file mode 100644
index 0000000..aa11943
--- /dev/null
+++ b/arch/arm64/include/asm/irqflags.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_IRQFLAGS_H
+#define __ASM_IRQFLAGS_H
+
+#ifdef __KERNEL__
+
+#include <asm/ptrace.h>
+
+/*
+ * CPU interrupt mask handling.
+ */
+static inline unsigned long arch_local_irq_save(void)
+{
+ unsigned long flags;
+ asm volatile(
+ "mrs %0, daif // arch_local_irq_save\n"
+ "msr daifset, #2"
+ : "=r" (flags)
+ :
+ : "memory");
+ return flags;
+}
+
+static inline void arch_local_irq_enable(void)
+{
+ asm volatile(
+ "msr daifclr, #2 // arch_local_irq_enable"
+ :
+ :
+ : "memory");
+}
+
+static inline void arch_local_irq_disable(void)
+{
+ asm volatile(
+ "msr daifset, #2 // arch_local_irq_disable"
+ :
+ :
+ : "memory");
+}
+
+#define local_fiq_enable() asm("msr daifclr, #1" : : : "memory")
+#define local_fiq_disable() asm("msr daifset, #1" : : : "memory")
+
+/*
+ * Save the current interrupt enable state.
+ */
+static inline unsigned long arch_local_save_flags(void)
+{
+ unsigned long flags;
+ asm volatile(
+ "mrs %0, daif // arch_local_save_flags"
+ : "=r" (flags)
+ :
+ : "memory");
+ return flags;
+}
+
+/*
+ * restore saved IRQ state
+ */
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+ asm volatile(
+ "msr daif, %0 // arch_local_irq_restore"
+ :
+ : "r" (flags)
+ : "memory");
+}
+
+static inline int arch_irqs_disabled_flags(unsigned long flags)
+{
+ return flags & PSR_I_BIT;
+}
+
+#endif
+#endif
diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
new file mode 100644
index 0000000..d346241
--- /dev/null
+++ b/arch/arm64/kernel/irq.c
@@ -0,0 +1,84 @@
+/*
+ * Based on arch/arm/kernel/irq.c
+ *
+ * Copyright (C) 1992 Linus Torvalds
+ * Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
+ * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
+ * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
+ * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel_stat.h>
+#include <linux/irq.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/of_irq.h>
+#include <linux/seq_file.h>
+
+unsigned long irq_err_count;
+
+int arch_show_interrupts(struct seq_file *p, int prec)
+{
+#ifdef CONFIG_SMP
+ show_ipi_list(p, prec);
+#endif
+ seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
+ return 0;
+}
+
+/*
+ * handle_IRQ handles all hardware IRQ's. Decoded IRQs should
+ * not come via this function. Instead, they should provide their
+ * own 'handler'. Used by platform code implementing C-based 1st
+ * level decoding.
+ */
+void handle_IRQ(unsigned int irq, struct pt_regs *regs)
+{
+ struct pt_regs *old_regs = set_irq_regs(regs);
+
+ irq_enter();
+
+ /*
+ * Some hardware gives randomly wrong interrupts. Rather
+ * than crashing, do something sensible.
+ */
+ if (unlikely(irq >= nr_irqs)) {
+ if (printk_ratelimit())
+ pr_warning("Bad IRQ%u\n", irq);
+ ack_bad_irq(irq);
+ } else {
+ generic_handle_irq(irq);
+ }
+
+ irq_exit();
+ set_irq_regs(old_regs);
+}
+
+/*
+ * Interrupt controllers supported by the kernel.
+ */
+static const struct of_device_id intctrl_of_match[] __initconst = {
+ /* IRQ controllers { .compatible, .data } info to go here */
+ {}
+};
+
+void __init init_IRQ(void)
+{
+ of_irq_init(intctrl_of_match);
+
+ if (!handle_arch_irq)
+ panic("No interrupt controller found.");
+}
next prev parent reply other threads:[~2012-08-14 17:54 UTC|newest]
Thread overview: 170+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-14 17:52 [PATCH v2 00/31] AArch64 Linux kernel port Catalin Marinas
2012-08-14 17:52 ` [PATCH v2 01/31] arm64: Assembly macros and definitions Catalin Marinas
2012-08-15 12:57 ` Arnd Bergmann
2012-08-14 17:52 ` [PATCH v2 02/31] arm64: Kernel booting and initialisation Catalin Marinas
2012-08-14 23:06 ` Olof Johansson
2012-08-15 17:37 ` Catalin Marinas
2012-08-15 19:03 ` Olof Johansson
2012-08-15 19:53 ` Catalin Marinas
2012-08-15 13:20 ` Arnd Bergmann
2012-08-15 17:06 ` Olof Johansson
2012-08-16 12:53 ` Catalin Marinas
2012-08-16 18:59 ` Nicolas Pitre
2012-08-17 11:20 ` Arnd Bergmann
2012-08-17 13:45 ` Catalin Marinas
2012-08-17 18:21 ` Nicolas Pitre
2012-08-17 8:56 ` Tony Lindgren
2012-08-17 9:41 ` Santosh Shilimkar
2012-08-17 10:05 ` Catalin Marinas
2012-08-17 10:10 ` Shilimkar, Santosh
2012-08-17 13:13 ` Tony Lindgren
2012-08-17 13:48 ` Catalin Marinas
2012-08-24 9:50 ` Catalin Marinas
2012-08-14 17:52 ` [PATCH v2 03/31] arm64: Exception handling Catalin Marinas
2012-08-14 23:29 ` Olof Johansson
2012-08-14 23:47 ` Thomas Gleixner
2012-08-15 13:03 ` Arnd Bergmann
2012-08-16 10:05 ` Will Deacon
2012-08-16 11:54 ` Arnd Bergmann
2012-08-14 17:52 ` [PATCH v2 04/31] arm64: MMU definitions Catalin Marinas
2012-08-15 13:30 ` Arnd Bergmann
2012-08-15 13:39 ` Catalin Marinas
2012-08-15 16:34 ` Geert Uytterhoeven
2012-08-15 16:45 ` Catalin Marinas
2012-08-17 9:04 ` Tony Lindgren
2012-08-17 9:21 ` Catalin Marinas
2012-08-17 9:38 ` Tony Lindgren
2012-08-14 17:52 ` [PATCH v2 05/31] arm64: MMU initialisation Catalin Marinas
2012-08-15 13:45 ` Arnd Bergmann
2012-08-17 10:06 ` Santosh Shilimkar
2012-08-17 10:15 ` Catalin Marinas
2012-08-17 10:25 ` Shilimkar, Santosh
2012-08-14 17:52 ` [PATCH v2 06/31] arm64: MMU fault handling and page table management Catalin Marinas
2012-08-15 13:47 ` Arnd Bergmann
2012-08-17 16:07 ` Catalin Marinas
2012-08-14 17:52 ` [PATCH v2 07/31] arm64: Process management Catalin Marinas
2012-08-14 23:50 ` Olof Johansson
2012-09-14 17:33 ` Catalin Marinas
2012-09-16 0:29 ` Olof Johansson
2012-08-15 13:53 ` Arnd Bergmann
2012-08-17 16:15 ` Catalin Marinas
2012-08-16 15:09 ` Tobias Klauser
2012-08-14 17:52 ` [PATCH v2 08/31] arm64: CPU support Catalin Marinas
2012-08-15 0:10 ` Olof Johansson
2012-08-20 15:57 ` Catalin Marinas
2012-08-20 20:47 ` Arnd Bergmann
2012-08-21 9:50 ` Catalin Marinas
2012-09-14 17:38 ` Catalin Marinas
2012-08-15 13:56 ` Arnd Bergmann
2012-08-20 16:00 ` Catalin Marinas
2012-08-14 17:52 ` [PATCH v2 09/31] arm64: Cache maintenance routines Catalin Marinas
2012-08-17 9:57 ` Santosh Shilimkar
2012-08-17 10:07 ` Catalin Marinas
2012-08-17 10:12 ` Shilimkar, Santosh
2012-08-14 17:52 ` [PATCH v2 10/31] arm64: TLB maintenance functionality Catalin Marinas
2012-08-14 17:52 ` Catalin Marinas [this message]
2012-08-14 23:22 ` [PATCH v2 11/31] arm64: IRQ handling Aaro Koskinen
2012-08-14 17:52 ` [PATCH v2 12/31] arm64: Atomic operations Catalin Marinas
2012-08-15 0:21 ` Olof Johansson
2012-08-14 17:52 ` [PATCH v2 13/31] arm64: Device specific operations Catalin Marinas
2012-08-15 0:33 ` Olof Johansson
2012-09-14 17:29 ` Catalin Marinas
2012-09-14 17:31 ` Arnd Bergmann
2012-09-14 17:39 ` Catalin Marinas
2012-09-16 0:28 ` Olof Johansson
2012-08-15 16:13 ` Arnd Bergmann
2012-08-17 9:19 ` Tony Lindgren
2012-08-14 17:52 ` [PATCH v2 14/31] arm64: DMA mapping API Catalin Marinas
2012-08-15 0:40 ` Olof Johansson
2012-08-21 13:05 ` Catalin Marinas
2012-08-15 16:16 ` Arnd Bergmann
2012-08-21 12:59 ` Catalin Marinas
2012-08-14 17:52 ` [PATCH v2 15/31] arm64: SMP support Catalin Marinas
2012-08-15 0:49 ` Olof Johansson
2012-08-15 13:04 ` Arnd Bergmann
2012-08-17 9:21 ` Tony Lindgren
2012-08-17 9:32 ` Catalin Marinas
2012-08-17 9:39 ` Tony Lindgren
2012-08-14 17:52 ` [PATCH v2 16/31] arm64: ELF definitions Catalin Marinas
2012-08-15 14:15 ` Arnd Bergmann
2012-08-16 10:23 ` Will Deacon
2012-08-16 12:37 ` Arnd Bergmann
2012-08-21 16:06 ` Catalin Marinas
2012-08-21 18:17 ` Geert Uytterhoeven
2012-08-21 18:27 ` Catalin Marinas
2012-08-21 18:53 ` Mike Frysinger
2012-08-21 20:17 ` Arnd Bergmann
2012-09-05 19:56 ` Chris Metcalf
2012-08-14 17:52 ` [PATCH v2 17/31] arm64: System calls handling Catalin Marinas
2012-08-15 14:22 ` Arnd Bergmann
2012-08-21 17:51 ` Catalin Marinas
2012-08-21 20:14 ` Arnd Bergmann
2012-08-21 22:01 ` Catalin Marinas
2012-08-22 7:56 ` Arnd Bergmann
2012-08-22 10:29 ` Catalin Marinas
2012-08-22 12:27 ` Arnd Bergmann
2012-08-22 17:13 ` Catalin Marinas
2012-09-03 11:48 ` Catalin Marinas
2012-09-03 12:39 ` Arnd Bergmann
2012-08-14 17:52 ` [PATCH v2 18/31] arm64: VDSO support Catalin Marinas
2012-08-14 17:52 ` [PATCH v2 19/31] arm64: Signal handling support Catalin Marinas
2012-08-14 17:52 ` [PATCH v2 20/31] arm64: User access library functions Catalin Marinas
2012-08-15 14:49 ` [PATCH v2 20/31] arm64: User access library function Arnd Bergmann
2012-09-03 12:58 ` Catalin Marinas
2012-09-05 19:13 ` Russell King - ARM Linux
2012-09-05 21:01 ` Catalin Marinas
2012-09-05 21:05 ` Russell King - ARM Linux
2012-09-06 8:36 ` Catalin Marinas
2012-08-14 17:52 ` [PATCH v2 21/31] arm64: 32-bit (compat) applications support Catalin Marinas
2012-08-15 14:34 ` Arnd Bergmann
2012-08-16 10:28 ` Will Deacon
2012-08-16 12:39 ` Arnd Bergmann
2012-08-23 6:46 ` PER_LINUX32, Was: " Arnd Bergmann
2012-08-23 10:42 ` Catalin Marinas
2012-08-28 18:28 ` Jiri Kosina
2012-08-24 10:43 ` Catalin Marinas
2012-08-26 4:49 ` Arnd Bergmann
2012-08-20 10:53 ` Pavel Machek
2012-08-20 20:34 ` Arnd Bergmann
2012-08-21 10:28 ` Pavel Machek
2012-08-14 17:52 ` [PATCH v2 22/31] arm64: Floating point and SIMD Catalin Marinas
2012-08-15 14:35 ` Arnd Bergmann
2012-08-14 17:52 ` [PATCH v2 23/31] arm64: Debugging support Catalin Marinas
2012-08-15 15:07 ` Arnd Bergmann
2012-08-16 10:47 ` Will Deacon
2012-08-16 12:49 ` Arnd Bergmann
2012-08-17 7:06 ` Arnd Bergmann
2012-08-20 9:07 ` Will Deacon
2012-08-20 9:27 ` Will Deacon
2012-08-20 20:10 ` Arnd Bergmann
2012-08-21 8:58 ` Will Deacon
2012-08-14 17:52 ` [PATCH v2 24/31] arm64: Add support for /proc/sys/debug/exception-trace Catalin Marinas
2012-08-15 15:08 ` Arnd Bergmann
2012-08-14 17:52 ` [PATCH v2 25/31] arm64: Performance counters support Catalin Marinas
2012-08-15 15:11 ` Arnd Bergmann
2012-08-16 10:51 ` Will Deacon
2012-08-14 17:52 ` [PATCH v2 26/31] arm64: Miscellaneous library functions Catalin Marinas
2012-08-15 15:21 ` Arnd Bergmann
2012-08-16 10:57 ` Will Deacon
2012-08-16 13:00 ` Arnd Bergmann
2012-08-16 14:11 ` Catalin Marinas
2012-08-14 17:52 ` [PATCH v2 27/31] arm64: Loadable modules Catalin Marinas
2012-08-15 15:23 ` Arnd Bergmann
2012-08-15 15:35 ` Catalin Marinas
2012-08-15 16:16 ` Arnd Bergmann
2012-08-14 17:52 ` [PATCH v2 28/31] arm64: Generic timers support Catalin Marinas
2012-08-15 15:52 ` Arnd Bergmann
2012-08-16 12:40 ` Linus Walleij
2012-08-17 9:29 ` Tony Lindgren
2012-08-17 10:21 ` Santosh Shilimkar
2012-08-21 19:20 ` Christopher Covington
2012-08-14 17:52 ` [PATCH v2 29/31] arm64: Miscellaneous header files Catalin Marinas
2012-08-15 15:56 ` Arnd Bergmann
2012-08-14 17:52 ` [PATCH v2 30/31] arm64: Build infrastructure Catalin Marinas
2012-08-14 21:01 ` Sam Ravnborg
2012-08-15 16:07 ` Arnd Bergmann
2012-08-17 9:32 ` Tony Lindgren
2012-08-17 9:46 ` Catalin Marinas
2012-08-14 17:52 ` [PATCH v2 31/31] arm64: MAINTAINERS update Catalin Marinas
2012-08-15 15:57 ` Arnd Bergmann
2012-08-17 9:36 ` [PATCH v2 00/31] AArch64 Linux kernel port Tony Lindgren
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