diff options
Diffstat (limited to 'drivers/gator/driver/gator_events_block.c')
| -rw-r--r-- | drivers/gator/driver/gator_events_block.c | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/drivers/gator/driver/gator_events_block.c b/drivers/gator/driver/gator_events_block.c deleted file mode 100644 index f1bbbc83bfb..00000000000 --- a/drivers/gator/driver/gator_events_block.c +++ /dev/null @@ -1,171 +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/block.h> - -#define BLOCK_RQ_WR 0 -#define BLOCK_RQ_RD 1 - -#define BLOCK_TOTAL (BLOCK_RQ_RD+1) - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36) -#define EVENTWRITE REQ_RW -#else -#define EVENTWRITE REQ_WRITE -#endif - -static ulong block_rq_wr_enabled; -static ulong block_rq_rd_enabled; -static ulong block_rq_wr_key; -static ulong block_rq_rd_key; -static DEFINE_PER_CPU(int[BLOCK_TOTAL], blockCnt); -static DEFINE_PER_CPU(int[BLOCK_TOTAL * 2], blockGet); -static DEFINE_PER_CPU(bool, new_data_avail); - -GATOR_DEFINE_PROBE(block_rq_complete, TP_PROTO(struct request_queue *q, struct request *rq)) -{ - unsigned long flags; - int write, size; - int cpu = smp_processor_id(); - - if (!rq) - return; - - write = rq->cmd_flags & EVENTWRITE; - size = rq->resid_len; - - if (!size) - return; - - // disable interrupts to synchronize with gator_events_block_read() - // spinlocks not needed since percpu buffers are used - local_irq_save(flags); - if (write) - per_cpu(blockCnt, cpu)[BLOCK_RQ_WR] += size; - else - per_cpu(blockCnt, cpu)[BLOCK_RQ_RD] += size; - local_irq_restore(flags); - - per_cpu(new_data_avail, cpu) = true; -} - -static int gator_events_block_create_files(struct super_block *sb, struct dentry *root) -{ - struct dentry *dir; - - /* block_complete_wr */ - dir = gatorfs_mkdir(sb, root, "Linux_block_rq_wr"); - if (!dir) { - return -1; - } - gatorfs_create_ulong(sb, dir, "enabled", &block_rq_wr_enabled); - gatorfs_create_ro_ulong(sb, dir, "key", &block_rq_wr_key); - - /* block_complete_rd */ - dir = gatorfs_mkdir(sb, root, "Linux_block_rq_rd"); - if (!dir) { - return -1; - } - gatorfs_create_ulong(sb, dir, "enabled", &block_rq_rd_enabled); - gatorfs_create_ro_ulong(sb, dir, "key", &block_rq_rd_key); - - return 0; -} - -static int gator_events_block_start(void) -{ - int cpu; - - for_each_present_cpu(cpu) - per_cpu(new_data_avail, cpu) = true; - - // register tracepoints - if (block_rq_wr_enabled || block_rq_rd_enabled) - if (GATOR_REGISTER_TRACE(block_rq_complete)) - goto fail_block_rq_exit; - pr_debug("gator: registered block event tracepoints\n"); - - return 0; - - // unregister tracepoints on error -fail_block_rq_exit: - pr_err("gator: block event tracepoints failed to activate, please verify that tracepoints are enabled in the linux kernel\n"); - - return -1; -} - -static void gator_events_block_stop(void) -{ - if (block_rq_wr_enabled || block_rq_rd_enabled) - GATOR_UNREGISTER_TRACE(block_rq_complete); - pr_debug("gator: unregistered block event tracepoints\n"); - - block_rq_wr_enabled = 0; - block_rq_rd_enabled = 0; -} - -static int gator_events_block_read(int **buffer) -{ - unsigned long flags; - int len, value, cpu, data = 0; - cpu = smp_processor_id(); - - if (per_cpu(new_data_avail, cpu) == false) - return 0; - - per_cpu(new_data_avail, cpu) = false; - - len = 0; - if (block_rq_wr_enabled) { - local_irq_save(flags); - value = per_cpu(blockCnt, cpu)[BLOCK_RQ_WR]; - per_cpu(blockCnt, cpu)[BLOCK_RQ_WR] = 0; - local_irq_restore(flags); - per_cpu(blockGet, cpu)[len++] = block_rq_wr_key; - per_cpu(blockGet, cpu)[len++] = value; - data += value; - } - if (block_rq_rd_enabled) { - local_irq_save(flags); - value = per_cpu(blockCnt, cpu)[BLOCK_RQ_RD]; - per_cpu(blockCnt, cpu)[BLOCK_RQ_RD] = 0; - local_irq_restore(flags); - per_cpu(blockGet, cpu)[len++] = block_rq_rd_key; - per_cpu(blockGet, cpu)[len++] = value; - data += value; - } - - if (data != 0) - per_cpu(new_data_avail, cpu) = true; - - if (buffer) - *buffer = per_cpu(blockGet, cpu); - - return len; -} - -static struct gator_interface gator_events_block_interface = { - .create_files = gator_events_block_create_files, - .start = gator_events_block_start, - .stop = gator_events_block_stop, - .read = gator_events_block_read, -}; - -int gator_events_block_init(void) -{ - block_rq_wr_enabled = 0; - block_rq_rd_enabled = 0; - - block_rq_wr_key = gator_events_get_key(); - block_rq_rd_key = gator_events_get_key(); - - return gator_events_install(&gator_events_block_interface); -} -gator_events_init(gator_events_block_init); |