diff options
Diffstat (limited to 'drivers/gator/gator_events_irq.c')
| -rw-r--r-- | drivers/gator/gator_events_irq.c | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/drivers/gator/gator_events_irq.c b/drivers/gator/gator_events_irq.c deleted file mode 100644 index 435bc86fb5d..00000000000 --- a/drivers/gator/gator_events_irq.c +++ /dev/null @@ -1,188 +0,0 @@ -/** - * Copyright (C) ARM Limited 2010-2012. All rights reserved. - * - * 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. - * - */ - -#include "gator.h" -#include <trace/events/irq.h> - -#define HARDIRQ 0 -#define SOFTIRQ 1 -#define TOTALIRQ (SOFTIRQ+1) - -static ulong hardirq_enabled; -static ulong softirq_enabled; -static ulong hardirq_key; -static ulong softirq_key; -static DEFINE_PER_CPU(int[TOTALIRQ], irqCnt); -static DEFINE_PER_CPU(int[TOTALIRQ * 2], irqGet); - -GATOR_DEFINE_PROBE(irq_handler_exit, TP_PROTO(int irq, - struct irqaction *action, int ret)) -{ - unsigned long flags; - - // disable interrupts to synchronize with gator_events_irq_read() - // spinlocks not needed since percpu buffers are used - local_irq_save(flags); - per_cpu(irqCnt, smp_processor_id())[HARDIRQ]++; - local_irq_restore(flags); -} - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 37) -GATOR_DEFINE_PROBE(softirq_exit, TP_PROTO(struct softirq_action *h, struct softirq_action *vec)) -#else -GATOR_DEFINE_PROBE(softirq_exit, TP_PROTO(unsigned int vec_nr)) -#endif -{ - unsigned long flags; - - // disable interrupts to synchronize with gator_events_irq_read() - // spinlocks not needed since percpu buffers are used - local_irq_save(flags); - per_cpu(irqCnt, smp_processor_id())[SOFTIRQ]++; - local_irq_restore(flags); -} - -static int gator_events_irq_create_files(struct super_block *sb, struct dentry *root) -{ - struct dentry *dir; - - /* irq */ - dir = gatorfs_mkdir(sb, root, "Linux_irq_irq"); - if (!dir) { - return -1; - } - gatorfs_create_ulong(sb, dir, "enabled", &hardirq_enabled); - gatorfs_create_ro_ulong(sb, dir, "key", &hardirq_key); - - /* soft irq */ - dir = gatorfs_mkdir(sb, root, "Linux_irq_softirq"); - if (!dir) { - return -1; - } - gatorfs_create_ulong(sb, dir, "enabled", &softirq_enabled); - gatorfs_create_ro_ulong(sb, dir, "key", &softirq_key); - - return 0; -} - -static int gator_events_irq_online(int** buffer) -{ - int len = 0, cpu = smp_processor_id(); - unsigned long flags; // not necessary as we are in interrupt context anyway, but doesn't hurt - - // synchronization with the irq_exit functions is not necessary as the values are being reset - if (hardirq_enabled) { - local_irq_save(flags); - per_cpu(irqCnt, cpu)[HARDIRQ] = 0; - local_irq_restore(flags); - per_cpu(irqGet, cpu)[len++] = hardirq_key; - per_cpu(irqGet, cpu)[len++] = 0; - } - - if (softirq_enabled) { - local_irq_save(flags); - per_cpu(irqCnt, cpu)[SOFTIRQ] = 0; - local_irq_restore(flags); - per_cpu(irqGet, cpu)[len++] = softirq_key; - per_cpu(irqGet, cpu)[len++] = 0; - } - - if (buffer) - *buffer = per_cpu(irqGet, cpu); - - return len; -} - -static int gator_events_irq_start(void) -{ - // register tracepoints - if (hardirq_enabled) - if (GATOR_REGISTER_TRACE(irq_handler_exit)) - goto fail_hardirq_exit; - if (softirq_enabled) - if (GATOR_REGISTER_TRACE(softirq_exit)) - goto fail_softirq_exit; - pr_debug("gator: registered irq tracepoints\n"); - - return 0; - - // unregister tracepoints on error -fail_softirq_exit: - if (hardirq_enabled) - GATOR_UNREGISTER_TRACE(irq_handler_exit); -fail_hardirq_exit: - pr_err("gator: irq tracepoints failed to activate, please verify that tracepoints are enabled in the linux kernel\n"); - - return -1; -} - -static void gator_events_irq_stop(void) -{ - if (hardirq_enabled) - GATOR_UNREGISTER_TRACE(irq_handler_exit); - if (softirq_enabled) - GATOR_UNREGISTER_TRACE(softirq_exit); - pr_debug("gator: unregistered irq tracepoints\n"); - - hardirq_enabled = 0; - softirq_enabled = 0; -} - -static int gator_events_irq_read(int **buffer) -{ - unsigned long flags; // not necessary as we are in interrupt context anyway, but doesn't hurt - int len, value; - int cpu = smp_processor_id(); - - len = 0; - if (hardirq_enabled) { - local_irq_save(flags); - value = per_cpu(irqCnt, cpu)[HARDIRQ]; - per_cpu(irqCnt, cpu)[HARDIRQ] = 0; - local_irq_restore(flags); - - per_cpu(irqGet, cpu)[len++] = hardirq_key; - per_cpu(irqGet, cpu)[len++] = value; - } - - if (softirq_enabled) { - local_irq_save(flags); - value = per_cpu(irqCnt, cpu)[SOFTIRQ]; - per_cpu(irqCnt, cpu)[SOFTIRQ] = 0; - local_irq_restore(flags); - - per_cpu(irqGet, cpu)[len++] = softirq_key; - per_cpu(irqGet, cpu)[len++] = value; - } - - if (buffer) - *buffer = per_cpu(irqGet, cpu); - - return len; -} - -static struct gator_interface gator_events_irq_interface = { - .create_files = gator_events_irq_create_files, - .online = gator_events_irq_online, - .start = gator_events_irq_start, - .stop = gator_events_irq_stop, - .read = gator_events_irq_read, -}; - -int gator_events_irq_init(void) -{ - hardirq_key = gator_events_get_key(); - softirq_key = gator_events_get_key(); - - hardirq_enabled = 0; - softirq_enabled = 0; - - return gator_events_install(&gator_events_irq_interface); -} -gator_events_init(gator_events_irq_init); |