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![Adrian Hunter](/assets/img/avatar_default.png)
Commit288dab8a35
("block: add a separate operation type for secure erase") split REQ_OP_SECURE_ERASE from REQ_OP_DISCARD without considering all the places REQ_OP_DISCARD was being used to mean either. Fix those. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Fixes:288dab8a35
("block: add a separate operation type for secure erase") Signed-off-by: Jens Axboe <axboe@fb.com>
1823 lines
43 KiB
C
1823 lines
43 KiB
C
/*
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* Copyright (C) 2006 Jens Axboe <axboe@kernel.dk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/blkdev.h>
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#include <linux/blktrace_api.h>
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#include <linux/percpu.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/debugfs.h>
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#include <linux/export.h>
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#include <linux/time.h>
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#include <linux/uaccess.h>
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#include <linux/list.h>
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#include <trace/events/block.h>
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#include "trace_output.h"
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#ifdef CONFIG_BLK_DEV_IO_TRACE
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static unsigned int blktrace_seq __read_mostly = 1;
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static struct trace_array *blk_tr;
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static bool blk_tracer_enabled __read_mostly;
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static LIST_HEAD(running_trace_list);
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static __cacheline_aligned_in_smp DEFINE_SPINLOCK(running_trace_lock);
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/* Select an alternative, minimalistic output than the original one */
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#define TRACE_BLK_OPT_CLASSIC 0x1
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static struct tracer_opt blk_tracer_opts[] = {
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/* Default disable the minimalistic output */
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{ TRACER_OPT(blk_classic, TRACE_BLK_OPT_CLASSIC) },
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{ }
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};
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static struct tracer_flags blk_tracer_flags = {
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.val = 0,
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.opts = blk_tracer_opts,
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};
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/* Global reference count of probes */
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static atomic_t blk_probes_ref = ATOMIC_INIT(0);
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static void blk_register_tracepoints(void);
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static void blk_unregister_tracepoints(void);
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/*
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* Send out a notify message.
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*/
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static void trace_note(struct blk_trace *bt, pid_t pid, int action,
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const void *data, size_t len)
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{
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struct blk_io_trace *t;
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struct ring_buffer_event *event = NULL;
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struct ring_buffer *buffer = NULL;
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int pc = 0;
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int cpu = smp_processor_id();
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bool blk_tracer = blk_tracer_enabled;
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if (blk_tracer) {
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buffer = blk_tr->trace_buffer.buffer;
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pc = preempt_count();
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event = trace_buffer_lock_reserve(buffer, TRACE_BLK,
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sizeof(*t) + len,
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0, pc);
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if (!event)
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return;
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t = ring_buffer_event_data(event);
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goto record_it;
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}
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if (!bt->rchan)
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return;
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t = relay_reserve(bt->rchan, sizeof(*t) + len);
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if (t) {
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t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
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t->time = ktime_to_ns(ktime_get());
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record_it:
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t->device = bt->dev;
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t->action = action;
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t->pid = pid;
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t->cpu = cpu;
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t->pdu_len = len;
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memcpy((void *) t + sizeof(*t), data, len);
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if (blk_tracer)
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trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc);
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}
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}
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/*
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* Send out a notify for this process, if we haven't done so since a trace
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* started
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*/
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static void trace_note_tsk(struct task_struct *tsk)
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{
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unsigned long flags;
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struct blk_trace *bt;
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tsk->btrace_seq = blktrace_seq;
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spin_lock_irqsave(&running_trace_lock, flags);
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list_for_each_entry(bt, &running_trace_list, running_list) {
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trace_note(bt, tsk->pid, BLK_TN_PROCESS, tsk->comm,
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sizeof(tsk->comm));
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}
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spin_unlock_irqrestore(&running_trace_lock, flags);
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}
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static void trace_note_time(struct blk_trace *bt)
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{
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struct timespec64 now;
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unsigned long flags;
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u32 words[2];
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/* need to check user space to see if this breaks in y2038 or y2106 */
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ktime_get_real_ts64(&now);
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words[0] = (u32)now.tv_sec;
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words[1] = now.tv_nsec;
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local_irq_save(flags);
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trace_note(bt, 0, BLK_TN_TIMESTAMP, words, sizeof(words));
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local_irq_restore(flags);
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}
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void __trace_note_message(struct blk_trace *bt, const char *fmt, ...)
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{
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int n;
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va_list args;
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unsigned long flags;
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char *buf;
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if (unlikely(bt->trace_state != Blktrace_running &&
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!blk_tracer_enabled))
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return;
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/*
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* If the BLK_TC_NOTIFY action mask isn't set, don't send any note
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* message to the trace.
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*/
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if (!(bt->act_mask & BLK_TC_NOTIFY))
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return;
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local_irq_save(flags);
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buf = this_cpu_ptr(bt->msg_data);
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va_start(args, fmt);
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n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args);
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va_end(args);
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trace_note(bt, 0, BLK_TN_MESSAGE, buf, n);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL_GPL(__trace_note_message);
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static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
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pid_t pid)
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{
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if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0)
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return 1;
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if (sector && (sector < bt->start_lba || sector > bt->end_lba))
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return 1;
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if (bt->pid && pid != bt->pid)
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return 1;
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return 0;
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}
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/*
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* Data direction bit lookup
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*/
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static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ),
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BLK_TC_ACT(BLK_TC_WRITE) };
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#define BLK_TC_RAHEAD BLK_TC_AHEAD
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#define BLK_TC_PREFLUSH BLK_TC_FLUSH
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/* The ilog2() calls fall out because they're constant */
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#define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \
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(ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name))
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/*
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* The worker for the various blk_add_trace*() types. Fills out a
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* blk_io_trace structure and places it in a per-cpu subbuffer.
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*/
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static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
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int op, int op_flags, u32 what, int error, int pdu_len,
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void *pdu_data)
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{
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struct task_struct *tsk = current;
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struct ring_buffer_event *event = NULL;
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struct ring_buffer *buffer = NULL;
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struct blk_io_trace *t;
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unsigned long flags = 0;
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unsigned long *sequence;
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pid_t pid;
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int cpu, pc = 0;
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bool blk_tracer = blk_tracer_enabled;
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if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer))
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return;
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what |= ddir_act[op_is_write(op) ? WRITE : READ];
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what |= MASK_TC_BIT(op_flags, SYNC);
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what |= MASK_TC_BIT(op_flags, RAHEAD);
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what |= MASK_TC_BIT(op_flags, META);
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what |= MASK_TC_BIT(op_flags, PREFLUSH);
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what |= MASK_TC_BIT(op_flags, FUA);
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if (op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)
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what |= BLK_TC_ACT(BLK_TC_DISCARD);
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if (op == REQ_OP_FLUSH)
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what |= BLK_TC_ACT(BLK_TC_FLUSH);
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pid = tsk->pid;
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if (act_log_check(bt, what, sector, pid))
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return;
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cpu = raw_smp_processor_id();
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if (blk_tracer) {
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tracing_record_cmdline(current);
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buffer = blk_tr->trace_buffer.buffer;
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pc = preempt_count();
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event = trace_buffer_lock_reserve(buffer, TRACE_BLK,
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sizeof(*t) + pdu_len,
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0, pc);
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if (!event)
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return;
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t = ring_buffer_event_data(event);
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goto record_it;
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}
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if (unlikely(tsk->btrace_seq != blktrace_seq))
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trace_note_tsk(tsk);
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/*
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* A word about the locking here - we disable interrupts to reserve
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* some space in the relay per-cpu buffer, to prevent an irq
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* from coming in and stepping on our toes.
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*/
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local_irq_save(flags);
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t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len);
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if (t) {
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sequence = per_cpu_ptr(bt->sequence, cpu);
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t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
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t->sequence = ++(*sequence);
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t->time = ktime_to_ns(ktime_get());
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record_it:
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/*
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* These two are not needed in ftrace as they are in the
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* generic trace_entry, filled by tracing_generic_entry_update,
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* but for the trace_event->bin() synthesizer benefit we do it
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* here too.
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*/
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t->cpu = cpu;
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t->pid = pid;
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t->sector = sector;
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t->bytes = bytes;
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t->action = what;
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t->device = bt->dev;
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t->error = error;
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t->pdu_len = pdu_len;
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if (pdu_len)
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memcpy((void *) t + sizeof(*t), pdu_data, pdu_len);
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if (blk_tracer) {
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trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc);
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return;
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}
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}
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local_irq_restore(flags);
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}
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static struct dentry *blk_tree_root;
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static DEFINE_MUTEX(blk_tree_mutex);
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static void blk_trace_free(struct blk_trace *bt)
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{
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debugfs_remove(bt->msg_file);
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debugfs_remove(bt->dropped_file);
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relay_close(bt->rchan);
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debugfs_remove(bt->dir);
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free_percpu(bt->sequence);
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free_percpu(bt->msg_data);
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kfree(bt);
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}
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static void blk_trace_cleanup(struct blk_trace *bt)
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{
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blk_trace_free(bt);
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if (atomic_dec_and_test(&blk_probes_ref))
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blk_unregister_tracepoints();
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}
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int blk_trace_remove(struct request_queue *q)
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{
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struct blk_trace *bt;
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bt = xchg(&q->blk_trace, NULL);
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if (!bt)
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return -EINVAL;
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if (bt->trace_state != Blktrace_running)
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blk_trace_cleanup(bt);
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return 0;
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}
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EXPORT_SYMBOL_GPL(blk_trace_remove);
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static ssize_t blk_dropped_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct blk_trace *bt = filp->private_data;
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char buf[16];
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snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped));
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return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
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}
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static const struct file_operations blk_dropped_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = blk_dropped_read,
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.llseek = default_llseek,
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};
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static ssize_t blk_msg_write(struct file *filp, const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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char *msg;
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struct blk_trace *bt;
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if (count >= BLK_TN_MAX_MSG)
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return -EINVAL;
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msg = memdup_user_nul(buffer, count);
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if (IS_ERR(msg))
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return PTR_ERR(msg);
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bt = filp->private_data;
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__trace_note_message(bt, "%s", msg);
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kfree(msg);
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return count;
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}
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static const struct file_operations blk_msg_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.write = blk_msg_write,
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.llseek = noop_llseek,
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};
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|
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/*
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* Keep track of how many times we encountered a full subbuffer, to aid
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* the user space app in telling how many lost events there were.
|
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*/
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static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf,
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void *prev_subbuf, size_t prev_padding)
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{
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struct blk_trace *bt;
|
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|
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if (!relay_buf_full(buf))
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return 1;
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|
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bt = buf->chan->private_data;
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atomic_inc(&bt->dropped);
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return 0;
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}
|
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|
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static int blk_remove_buf_file_callback(struct dentry *dentry)
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{
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debugfs_remove(dentry);
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|
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return 0;
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}
|
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|
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static struct dentry *blk_create_buf_file_callback(const char *filename,
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struct dentry *parent,
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umode_t mode,
|
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struct rchan_buf *buf,
|
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int *is_global)
|
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{
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return debugfs_create_file(filename, mode, parent, buf,
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&relay_file_operations);
|
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}
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|
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static struct rchan_callbacks blk_relay_callbacks = {
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.subbuf_start = blk_subbuf_start_callback,
|
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.create_buf_file = blk_create_buf_file_callback,
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.remove_buf_file = blk_remove_buf_file_callback,
|
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};
|
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|
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static void blk_trace_setup_lba(struct blk_trace *bt,
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struct block_device *bdev)
|
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{
|
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struct hd_struct *part = NULL;
|
|
|
|
if (bdev)
|
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part = bdev->bd_part;
|
|
|
|
if (part) {
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bt->start_lba = part->start_sect;
|
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bt->end_lba = part->start_sect + part->nr_sects;
|
|
} else {
|
|
bt->start_lba = 0;
|
|
bt->end_lba = -1ULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Setup everything required to start tracing
|
|
*/
|
|
int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
|
|
struct block_device *bdev,
|
|
struct blk_user_trace_setup *buts)
|
|
{
|
|
struct blk_trace *bt = NULL;
|
|
struct dentry *dir = NULL;
|
|
int ret;
|
|
|
|
if (!buts->buf_size || !buts->buf_nr)
|
|
return -EINVAL;
|
|
|
|
strncpy(buts->name, name, BLKTRACE_BDEV_SIZE);
|
|
buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0';
|
|
|
|
/*
|
|
* some device names have larger paths - convert the slashes
|
|
* to underscores for this to work as expected
|
|
*/
|
|
strreplace(buts->name, '/', '_');
|
|
|
|
bt = kzalloc(sizeof(*bt), GFP_KERNEL);
|
|
if (!bt)
|
|
return -ENOMEM;
|
|
|
|
ret = -ENOMEM;
|
|
bt->sequence = alloc_percpu(unsigned long);
|
|
if (!bt->sequence)
|
|
goto err;
|
|
|
|
bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char));
|
|
if (!bt->msg_data)
|
|
goto err;
|
|
|
|
ret = -ENOENT;
|
|
|
|
mutex_lock(&blk_tree_mutex);
|
|
if (!blk_tree_root) {
|
|
blk_tree_root = debugfs_create_dir("block", NULL);
|
|
if (!blk_tree_root) {
|
|
mutex_unlock(&blk_tree_mutex);
|
|
goto err;
|
|
}
|
|
}
|
|
mutex_unlock(&blk_tree_mutex);
|
|
|
|
dir = debugfs_create_dir(buts->name, blk_tree_root);
|
|
|
|
if (!dir)
|
|
goto err;
|
|
|
|
bt->dir = dir;
|
|
bt->dev = dev;
|
|
atomic_set(&bt->dropped, 0);
|
|
INIT_LIST_HEAD(&bt->running_list);
|
|
|
|
ret = -EIO;
|
|
bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt,
|
|
&blk_dropped_fops);
|
|
if (!bt->dropped_file)
|
|
goto err;
|
|
|
|
bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops);
|
|
if (!bt->msg_file)
|
|
goto err;
|
|
|
|
bt->rchan = relay_open("trace", dir, buts->buf_size,
|
|
buts->buf_nr, &blk_relay_callbacks, bt);
|
|
if (!bt->rchan)
|
|
goto err;
|
|
|
|
bt->act_mask = buts->act_mask;
|
|
if (!bt->act_mask)
|
|
bt->act_mask = (u16) -1;
|
|
|
|
blk_trace_setup_lba(bt, bdev);
|
|
|
|
/* overwrite with user settings */
|
|
if (buts->start_lba)
|
|
bt->start_lba = buts->start_lba;
|
|
if (buts->end_lba)
|
|
bt->end_lba = buts->end_lba;
|
|
|
|
bt->pid = buts->pid;
|
|
bt->trace_state = Blktrace_setup;
|
|
|
|
ret = -EBUSY;
|
|
if (cmpxchg(&q->blk_trace, NULL, bt))
|
|
goto err;
|
|
|
|
if (atomic_inc_return(&blk_probes_ref) == 1)
|
|
blk_register_tracepoints();
|
|
|
|
return 0;
|
|
err:
|
|
blk_trace_free(bt);
|
|
return ret;
|
|
}
|
|
|
|
int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
|
|
struct block_device *bdev,
|
|
char __user *arg)
|
|
{
|
|
struct blk_user_trace_setup buts;
|
|
int ret;
|
|
|
|
ret = copy_from_user(&buts, arg, sizeof(buts));
|
|
if (ret)
|
|
return -EFAULT;
|
|
|
|
ret = do_blk_trace_setup(q, name, dev, bdev, &buts);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (copy_to_user(arg, &buts, sizeof(buts))) {
|
|
blk_trace_remove(q);
|
|
return -EFAULT;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(blk_trace_setup);
|
|
|
|
#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
|
|
static int compat_blk_trace_setup(struct request_queue *q, char *name,
|
|
dev_t dev, struct block_device *bdev,
|
|
char __user *arg)
|
|
{
|
|
struct blk_user_trace_setup buts;
|
|
struct compat_blk_user_trace_setup cbuts;
|
|
int ret;
|
|
|
|
if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
|
|
return -EFAULT;
|
|
|
|
buts = (struct blk_user_trace_setup) {
|
|
.act_mask = cbuts.act_mask,
|
|
.buf_size = cbuts.buf_size,
|
|
.buf_nr = cbuts.buf_nr,
|
|
.start_lba = cbuts.start_lba,
|
|
.end_lba = cbuts.end_lba,
|
|
.pid = cbuts.pid,
|
|
};
|
|
|
|
ret = do_blk_trace_setup(q, name, dev, bdev, &buts);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (copy_to_user(arg, &buts.name, ARRAY_SIZE(buts.name))) {
|
|
blk_trace_remove(q);
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int blk_trace_startstop(struct request_queue *q, int start)
|
|
{
|
|
int ret;
|
|
struct blk_trace *bt = q->blk_trace;
|
|
|
|
if (bt == NULL)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* For starting a trace, we can transition from a setup or stopped
|
|
* trace. For stopping a trace, the state must be running
|
|
*/
|
|
ret = -EINVAL;
|
|
if (start) {
|
|
if (bt->trace_state == Blktrace_setup ||
|
|
bt->trace_state == Blktrace_stopped) {
|
|
blktrace_seq++;
|
|
smp_mb();
|
|
bt->trace_state = Blktrace_running;
|
|
spin_lock_irq(&running_trace_lock);
|
|
list_add(&bt->running_list, &running_trace_list);
|
|
spin_unlock_irq(&running_trace_lock);
|
|
|
|
trace_note_time(bt);
|
|
ret = 0;
|
|
}
|
|
} else {
|
|
if (bt->trace_state == Blktrace_running) {
|
|
bt->trace_state = Blktrace_stopped;
|
|
spin_lock_irq(&running_trace_lock);
|
|
list_del_init(&bt->running_list);
|
|
spin_unlock_irq(&running_trace_lock);
|
|
relay_flush(bt->rchan);
|
|
ret = 0;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(blk_trace_startstop);
|
|
|
|
/**
|
|
* blk_trace_ioctl: - handle the ioctls associated with tracing
|
|
* @bdev: the block device
|
|
* @cmd: the ioctl cmd
|
|
* @arg: the argument data, if any
|
|
*
|
|
**/
|
|
int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
|
|
{
|
|
struct request_queue *q;
|
|
int ret, start = 0;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
q = bdev_get_queue(bdev);
|
|
if (!q)
|
|
return -ENXIO;
|
|
|
|
mutex_lock(&bdev->bd_mutex);
|
|
|
|
switch (cmd) {
|
|
case BLKTRACESETUP:
|
|
bdevname(bdev, b);
|
|
ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
|
|
break;
|
|
#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
|
|
case BLKTRACESETUP32:
|
|
bdevname(bdev, b);
|
|
ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
|
|
break;
|
|
#endif
|
|
case BLKTRACESTART:
|
|
start = 1;
|
|
case BLKTRACESTOP:
|
|
ret = blk_trace_startstop(q, start);
|
|
break;
|
|
case BLKTRACETEARDOWN:
|
|
ret = blk_trace_remove(q);
|
|
break;
|
|
default:
|
|
ret = -ENOTTY;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&bdev->bd_mutex);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* blk_trace_shutdown: - stop and cleanup trace structures
|
|
* @q: the request queue associated with the device
|
|
*
|
|
**/
|
|
void blk_trace_shutdown(struct request_queue *q)
|
|
{
|
|
if (q->blk_trace) {
|
|
blk_trace_startstop(q, 0);
|
|
blk_trace_remove(q);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* blktrace probes
|
|
*/
|
|
|
|
/**
|
|
* blk_add_trace_rq - Add a trace for a request oriented action
|
|
* @q: queue the io is for
|
|
* @rq: the source request
|
|
* @nr_bytes: number of completed bytes
|
|
* @what: the action
|
|
*
|
|
* Description:
|
|
* Records an action against a request. Will log the bio offset + size.
|
|
*
|
|
**/
|
|
static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
|
|
unsigned int nr_bytes, u32 what)
|
|
{
|
|
struct blk_trace *bt = q->blk_trace;
|
|
|
|
if (likely(!bt))
|
|
return;
|
|
|
|
if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
|
|
what |= BLK_TC_ACT(BLK_TC_PC);
|
|
__blk_add_trace(bt, 0, nr_bytes, req_op(rq), rq->cmd_flags,
|
|
what, rq->errors, rq->cmd_len, rq->cmd);
|
|
} else {
|
|
what |= BLK_TC_ACT(BLK_TC_FS);
|
|
__blk_add_trace(bt, blk_rq_pos(rq), nr_bytes, req_op(rq),
|
|
rq->cmd_flags, what, rq->errors, 0, NULL);
|
|
}
|
|
}
|
|
|
|
static void blk_add_trace_rq_abort(void *ignore,
|
|
struct request_queue *q, struct request *rq)
|
|
{
|
|
blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_ABORT);
|
|
}
|
|
|
|
static void blk_add_trace_rq_insert(void *ignore,
|
|
struct request_queue *q, struct request *rq)
|
|
{
|
|
blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_INSERT);
|
|
}
|
|
|
|
static void blk_add_trace_rq_issue(void *ignore,
|
|
struct request_queue *q, struct request *rq)
|
|
{
|
|
blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_ISSUE);
|
|
}
|
|
|
|
static void blk_add_trace_rq_requeue(void *ignore,
|
|
struct request_queue *q,
|
|
struct request *rq)
|
|
{
|
|
blk_add_trace_rq(q, rq, blk_rq_bytes(rq), BLK_TA_REQUEUE);
|
|
}
|
|
|
|
static void blk_add_trace_rq_complete(void *ignore,
|
|
struct request_queue *q,
|
|
struct request *rq,
|
|
unsigned int nr_bytes)
|
|
{
|
|
blk_add_trace_rq(q, rq, nr_bytes, BLK_TA_COMPLETE);
|
|
}
|
|
|
|
/**
|
|
* blk_add_trace_bio - Add a trace for a bio oriented action
|
|
* @q: queue the io is for
|
|
* @bio: the source bio
|
|
* @what: the action
|
|
* @error: error, if any
|
|
*
|
|
* Description:
|
|
* Records an action against a bio. Will log the bio offset + size.
|
|
*
|
|
**/
|
|
static void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
|
|
u32 what, int error)
|
|
{
|
|
struct blk_trace *bt = q->blk_trace;
|
|
|
|
if (likely(!bt))
|
|
return;
|
|
|
|
__blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size,
|
|
bio_op(bio), bio->bi_opf, what, error, 0, NULL);
|
|
}
|
|
|
|
static void blk_add_trace_bio_bounce(void *ignore,
|
|
struct request_queue *q, struct bio *bio)
|
|
{
|
|
blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0);
|
|
}
|
|
|
|
static void blk_add_trace_bio_complete(void *ignore,
|
|
struct request_queue *q, struct bio *bio,
|
|
int error)
|
|
{
|
|
blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error);
|
|
}
|
|
|
|
static void blk_add_trace_bio_backmerge(void *ignore,
|
|
struct request_queue *q,
|
|
struct request *rq,
|
|
struct bio *bio)
|
|
{
|
|
blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0);
|
|
}
|
|
|
|
static void blk_add_trace_bio_frontmerge(void *ignore,
|
|
struct request_queue *q,
|
|
struct request *rq,
|
|
struct bio *bio)
|
|
{
|
|
blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0);
|
|
}
|
|
|
|
static void blk_add_trace_bio_queue(void *ignore,
|
|
struct request_queue *q, struct bio *bio)
|
|
{
|
|
blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0);
|
|
}
|
|
|
|
static void blk_add_trace_getrq(void *ignore,
|
|
struct request_queue *q,
|
|
struct bio *bio, int rw)
|
|
{
|
|
if (bio)
|
|
blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0);
|
|
else {
|
|
struct blk_trace *bt = q->blk_trace;
|
|
|
|
if (bt)
|
|
__blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_GETRQ, 0, 0,
|
|
NULL);
|
|
}
|
|
}
|
|
|
|
|
|
static void blk_add_trace_sleeprq(void *ignore,
|
|
struct request_queue *q,
|
|
struct bio *bio, int rw)
|
|
{
|
|
if (bio)
|
|
blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0);
|
|
else {
|
|
struct blk_trace *bt = q->blk_trace;
|
|
|
|
if (bt)
|
|
__blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_SLEEPRQ,
|
|
0, 0, NULL);
|
|
}
|
|
}
|
|
|
|
static void blk_add_trace_plug(void *ignore, struct request_queue *q)
|
|
{
|
|
struct blk_trace *bt = q->blk_trace;
|
|
|
|
if (bt)
|
|
__blk_add_trace(bt, 0, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL);
|
|
}
|
|
|
|
static void blk_add_trace_unplug(void *ignore, struct request_queue *q,
|
|
unsigned int depth, bool explicit)
|
|
{
|
|
struct blk_trace *bt = q->blk_trace;
|
|
|
|
if (bt) {
|
|
__be64 rpdu = cpu_to_be64(depth);
|
|
u32 what;
|
|
|
|
if (explicit)
|
|
what = BLK_TA_UNPLUG_IO;
|
|
else
|
|
what = BLK_TA_UNPLUG_TIMER;
|
|
|
|
__blk_add_trace(bt, 0, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu);
|
|
}
|
|
}
|
|
|
|
static void blk_add_trace_split(void *ignore,
|
|
struct request_queue *q, struct bio *bio,
|
|
unsigned int pdu)
|
|
{
|
|
struct blk_trace *bt = q->blk_trace;
|
|
|
|
if (bt) {
|
|
__be64 rpdu = cpu_to_be64(pdu);
|
|
|
|
__blk_add_trace(bt, bio->bi_iter.bi_sector,
|
|
bio->bi_iter.bi_size, bio_op(bio), bio->bi_opf,
|
|
BLK_TA_SPLIT, bio->bi_error, sizeof(rpdu),
|
|
&rpdu);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* blk_add_trace_bio_remap - Add a trace for a bio-remap operation
|
|
* @ignore: trace callback data parameter (not used)
|
|
* @q: queue the io is for
|
|
* @bio: the source bio
|
|
* @dev: target device
|
|
* @from: source sector
|
|
*
|
|
* Description:
|
|
* Device mapper or raid target sometimes need to split a bio because
|
|
* it spans a stripe (or similar). Add a trace for that action.
|
|
*
|
|
**/
|
|
static void blk_add_trace_bio_remap(void *ignore,
|
|
struct request_queue *q, struct bio *bio,
|
|
dev_t dev, sector_t from)
|
|
{
|
|
struct blk_trace *bt = q->blk_trace;
|
|
struct blk_io_trace_remap r;
|
|
|
|
if (likely(!bt))
|
|
return;
|
|
|
|
r.device_from = cpu_to_be32(dev);
|
|
r.device_to = cpu_to_be32(bio->bi_bdev->bd_dev);
|
|
r.sector_from = cpu_to_be64(from);
|
|
|
|
__blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size,
|
|
bio_op(bio), bio->bi_opf, BLK_TA_REMAP, bio->bi_error,
|
|
sizeof(r), &r);
|
|
}
|
|
|
|
/**
|
|
* blk_add_trace_rq_remap - Add a trace for a request-remap operation
|
|
* @ignore: trace callback data parameter (not used)
|
|
* @q: queue the io is for
|
|
* @rq: the source request
|
|
* @dev: target device
|
|
* @from: source sector
|
|
*
|
|
* Description:
|
|
* Device mapper remaps request to other devices.
|
|
* Add a trace for that action.
|
|
*
|
|
**/
|
|
static void blk_add_trace_rq_remap(void *ignore,
|
|
struct request_queue *q,
|
|
struct request *rq, dev_t dev,
|
|
sector_t from)
|
|
{
|
|
struct blk_trace *bt = q->blk_trace;
|
|
struct blk_io_trace_remap r;
|
|
|
|
if (likely(!bt))
|
|
return;
|
|
|
|
r.device_from = cpu_to_be32(dev);
|
|
r.device_to = cpu_to_be32(disk_devt(rq->rq_disk));
|
|
r.sector_from = cpu_to_be64(from);
|
|
|
|
__blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq),
|
|
rq_data_dir(rq), 0, BLK_TA_REMAP, !!rq->errors,
|
|
sizeof(r), &r);
|
|
}
|
|
|
|
/**
|
|
* blk_add_driver_data - Add binary message with driver-specific data
|
|
* @q: queue the io is for
|
|
* @rq: io request
|
|
* @data: driver-specific data
|
|
* @len: length of driver-specific data
|
|
*
|
|
* Description:
|
|
* Some drivers might want to write driver-specific data per request.
|
|
*
|
|
**/
|
|
void blk_add_driver_data(struct request_queue *q,
|
|
struct request *rq,
|
|
void *data, size_t len)
|
|
{
|
|
struct blk_trace *bt = q->blk_trace;
|
|
|
|
if (likely(!bt))
|
|
return;
|
|
|
|
if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
|
|
__blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, 0,
|
|
BLK_TA_DRV_DATA, rq->errors, len, data);
|
|
else
|
|
__blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, 0,
|
|
BLK_TA_DRV_DATA, rq->errors, len, data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(blk_add_driver_data);
|
|
|
|
static void blk_register_tracepoints(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_trace_block_rq_abort(blk_add_trace_rq_abort, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_rq_insert(blk_add_trace_rq_insert, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_rq_issue(blk_add_trace_rq_issue, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_rq_complete(blk_add_trace_rq_complete, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_bio_complete(blk_add_trace_bio_complete, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_bio_queue(blk_add_trace_bio_queue, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_getrq(blk_add_trace_getrq, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_sleeprq(blk_add_trace_sleeprq, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_plug(blk_add_trace_plug, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_unplug(blk_add_trace_unplug, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_split(blk_add_trace_split, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL);
|
|
WARN_ON(ret);
|
|
ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL);
|
|
WARN_ON(ret);
|
|
}
|
|
|
|
static void blk_unregister_tracepoints(void)
|
|
{
|
|
unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL);
|
|
unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL);
|
|
unregister_trace_block_split(blk_add_trace_split, NULL);
|
|
unregister_trace_block_unplug(blk_add_trace_unplug, NULL);
|
|
unregister_trace_block_plug(blk_add_trace_plug, NULL);
|
|
unregister_trace_block_sleeprq(blk_add_trace_sleeprq, NULL);
|
|
unregister_trace_block_getrq(blk_add_trace_getrq, NULL);
|
|
unregister_trace_block_bio_queue(blk_add_trace_bio_queue, NULL);
|
|
unregister_trace_block_bio_frontmerge(blk_add_trace_bio_frontmerge, NULL);
|
|
unregister_trace_block_bio_backmerge(blk_add_trace_bio_backmerge, NULL);
|
|
unregister_trace_block_bio_complete(blk_add_trace_bio_complete, NULL);
|
|
unregister_trace_block_bio_bounce(blk_add_trace_bio_bounce, NULL);
|
|
unregister_trace_block_rq_complete(blk_add_trace_rq_complete, NULL);
|
|
unregister_trace_block_rq_requeue(blk_add_trace_rq_requeue, NULL);
|
|
unregister_trace_block_rq_issue(blk_add_trace_rq_issue, NULL);
|
|
unregister_trace_block_rq_insert(blk_add_trace_rq_insert, NULL);
|
|
unregister_trace_block_rq_abort(blk_add_trace_rq_abort, NULL);
|
|
|
|
tracepoint_synchronize_unregister();
|
|
}
|
|
|
|
/*
|
|
* struct blk_io_tracer formatting routines
|
|
*/
|
|
|
|
static void fill_rwbs(char *rwbs, const struct blk_io_trace *t)
|
|
{
|
|
int i = 0;
|
|
int tc = t->action >> BLK_TC_SHIFT;
|
|
|
|
if (t->action == BLK_TN_MESSAGE) {
|
|
rwbs[i++] = 'N';
|
|
goto out;
|
|
}
|
|
|
|
if (tc & BLK_TC_FLUSH)
|
|
rwbs[i++] = 'F';
|
|
|
|
if (tc & BLK_TC_DISCARD)
|
|
rwbs[i++] = 'D';
|
|
else if (tc & BLK_TC_WRITE)
|
|
rwbs[i++] = 'W';
|
|
else if (t->bytes)
|
|
rwbs[i++] = 'R';
|
|
else
|
|
rwbs[i++] = 'N';
|
|
|
|
if (tc & BLK_TC_FUA)
|
|
rwbs[i++] = 'F';
|
|
if (tc & BLK_TC_AHEAD)
|
|
rwbs[i++] = 'A';
|
|
if (tc & BLK_TC_SYNC)
|
|
rwbs[i++] = 'S';
|
|
if (tc & BLK_TC_META)
|
|
rwbs[i++] = 'M';
|
|
out:
|
|
rwbs[i] = '\0';
|
|
}
|
|
|
|
static inline
|
|
const struct blk_io_trace *te_blk_io_trace(const struct trace_entry *ent)
|
|
{
|
|
return (const struct blk_io_trace *)ent;
|
|
}
|
|
|
|
static inline const void *pdu_start(const struct trace_entry *ent)
|
|
{
|
|
return te_blk_io_trace(ent) + 1;
|
|
}
|
|
|
|
static inline u32 t_action(const struct trace_entry *ent)
|
|
{
|
|
return te_blk_io_trace(ent)->action;
|
|
}
|
|
|
|
static inline u32 t_bytes(const struct trace_entry *ent)
|
|
{
|
|
return te_blk_io_trace(ent)->bytes;
|
|
}
|
|
|
|
static inline u32 t_sec(const struct trace_entry *ent)
|
|
{
|
|
return te_blk_io_trace(ent)->bytes >> 9;
|
|
}
|
|
|
|
static inline unsigned long long t_sector(const struct trace_entry *ent)
|
|
{
|
|
return te_blk_io_trace(ent)->sector;
|
|
}
|
|
|
|
static inline __u16 t_error(const struct trace_entry *ent)
|
|
{
|
|
return te_blk_io_trace(ent)->error;
|
|
}
|
|
|
|
static __u64 get_pdu_int(const struct trace_entry *ent)
|
|
{
|
|
const __u64 *val = pdu_start(ent);
|
|
return be64_to_cpu(*val);
|
|
}
|
|
|
|
static void get_pdu_remap(const struct trace_entry *ent,
|
|
struct blk_io_trace_remap *r)
|
|
{
|
|
const struct blk_io_trace_remap *__r = pdu_start(ent);
|
|
__u64 sector_from = __r->sector_from;
|
|
|
|
r->device_from = be32_to_cpu(__r->device_from);
|
|
r->device_to = be32_to_cpu(__r->device_to);
|
|
r->sector_from = be64_to_cpu(sector_from);
|
|
}
|
|
|
|
typedef void (blk_log_action_t) (struct trace_iterator *iter, const char *act);
|
|
|
|
static void blk_log_action_classic(struct trace_iterator *iter, const char *act)
|
|
{
|
|
char rwbs[RWBS_LEN];
|
|
unsigned long long ts = iter->ts;
|
|
unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC);
|
|
unsigned secs = (unsigned long)ts;
|
|
const struct blk_io_trace *t = te_blk_io_trace(iter->ent);
|
|
|
|
fill_rwbs(rwbs, t);
|
|
|
|
trace_seq_printf(&iter->seq,
|
|
"%3d,%-3d %2d %5d.%09lu %5u %2s %3s ",
|
|
MAJOR(t->device), MINOR(t->device), iter->cpu,
|
|
secs, nsec_rem, iter->ent->pid, act, rwbs);
|
|
}
|
|
|
|
static void blk_log_action(struct trace_iterator *iter, const char *act)
|
|
{
|
|
char rwbs[RWBS_LEN];
|
|
const struct blk_io_trace *t = te_blk_io_trace(iter->ent);
|
|
|
|
fill_rwbs(rwbs, t);
|
|
trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ",
|
|
MAJOR(t->device), MINOR(t->device), act, rwbs);
|
|
}
|
|
|
|
static void blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent)
|
|
{
|
|
const unsigned char *pdu_buf;
|
|
int pdu_len;
|
|
int i, end;
|
|
|
|
pdu_buf = pdu_start(ent);
|
|
pdu_len = te_blk_io_trace(ent)->pdu_len;
|
|
|
|
if (!pdu_len)
|
|
return;
|
|
|
|
/* find the last zero that needs to be printed */
|
|
for (end = pdu_len - 1; end >= 0; end--)
|
|
if (pdu_buf[end])
|
|
break;
|
|
end++;
|
|
|
|
trace_seq_putc(s, '(');
|
|
|
|
for (i = 0; i < pdu_len; i++) {
|
|
|
|
trace_seq_printf(s, "%s%02x",
|
|
i == 0 ? "" : " ", pdu_buf[i]);
|
|
|
|
/*
|
|
* stop when the rest is just zeroes and indicate so
|
|
* with a ".." appended
|
|
*/
|
|
if (i == end && end != pdu_len - 1) {
|
|
trace_seq_puts(s, " ..) ");
|
|
return;
|
|
}
|
|
}
|
|
|
|
trace_seq_puts(s, ") ");
|
|
}
|
|
|
|
static void blk_log_generic(struct trace_seq *s, const struct trace_entry *ent)
|
|
{
|
|
char cmd[TASK_COMM_LEN];
|
|
|
|
trace_find_cmdline(ent->pid, cmd);
|
|
|
|
if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) {
|
|
trace_seq_printf(s, "%u ", t_bytes(ent));
|
|
blk_log_dump_pdu(s, ent);
|
|
trace_seq_printf(s, "[%s]\n", cmd);
|
|
} else {
|
|
if (t_sec(ent))
|
|
trace_seq_printf(s, "%llu + %u [%s]\n",
|
|
t_sector(ent), t_sec(ent), cmd);
|
|
else
|
|
trace_seq_printf(s, "[%s]\n", cmd);
|
|
}
|
|
}
|
|
|
|
static void blk_log_with_error(struct trace_seq *s,
|
|
const struct trace_entry *ent)
|
|
{
|
|
if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) {
|
|
blk_log_dump_pdu(s, ent);
|
|
trace_seq_printf(s, "[%d]\n", t_error(ent));
|
|
} else {
|
|
if (t_sec(ent))
|
|
trace_seq_printf(s, "%llu + %u [%d]\n",
|
|
t_sector(ent),
|
|
t_sec(ent), t_error(ent));
|
|
else
|
|
trace_seq_printf(s, "%llu [%d]\n",
|
|
t_sector(ent), t_error(ent));
|
|
}
|
|
}
|
|
|
|
static void blk_log_remap(struct trace_seq *s, const struct trace_entry *ent)
|
|
{
|
|
struct blk_io_trace_remap r = { .device_from = 0, };
|
|
|
|
get_pdu_remap(ent, &r);
|
|
trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n",
|
|
t_sector(ent), t_sec(ent),
|
|
MAJOR(r.device_from), MINOR(r.device_from),
|
|
(unsigned long long)r.sector_from);
|
|
}
|
|
|
|
static void blk_log_plug(struct trace_seq *s, const struct trace_entry *ent)
|
|
{
|
|
char cmd[TASK_COMM_LEN];
|
|
|
|
trace_find_cmdline(ent->pid, cmd);
|
|
|
|
trace_seq_printf(s, "[%s]\n", cmd);
|
|
}
|
|
|
|
static void blk_log_unplug(struct trace_seq *s, const struct trace_entry *ent)
|
|
{
|
|
char cmd[TASK_COMM_LEN];
|
|
|
|
trace_find_cmdline(ent->pid, cmd);
|
|
|
|
trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(ent));
|
|
}
|
|
|
|
static void blk_log_split(struct trace_seq *s, const struct trace_entry *ent)
|
|
{
|
|
char cmd[TASK_COMM_LEN];
|
|
|
|
trace_find_cmdline(ent->pid, cmd);
|
|
|
|
trace_seq_printf(s, "%llu / %llu [%s]\n", t_sector(ent),
|
|
get_pdu_int(ent), cmd);
|
|
}
|
|
|
|
static void blk_log_msg(struct trace_seq *s, const struct trace_entry *ent)
|
|
{
|
|
const struct blk_io_trace *t = te_blk_io_trace(ent);
|
|
|
|
trace_seq_putmem(s, t + 1, t->pdu_len);
|
|
trace_seq_putc(s, '\n');
|
|
}
|
|
|
|
/*
|
|
* struct tracer operations
|
|
*/
|
|
|
|
static void blk_tracer_print_header(struct seq_file *m)
|
|
{
|
|
if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC))
|
|
return;
|
|
seq_puts(m, "# DEV CPU TIMESTAMP PID ACT FLG\n"
|
|
"# | | | | | |\n");
|
|
}
|
|
|
|
static void blk_tracer_start(struct trace_array *tr)
|
|
{
|
|
blk_tracer_enabled = true;
|
|
}
|
|
|
|
static int blk_tracer_init(struct trace_array *tr)
|
|
{
|
|
blk_tr = tr;
|
|
blk_tracer_start(tr);
|
|
return 0;
|
|
}
|
|
|
|
static void blk_tracer_stop(struct trace_array *tr)
|
|
{
|
|
blk_tracer_enabled = false;
|
|
}
|
|
|
|
static void blk_tracer_reset(struct trace_array *tr)
|
|
{
|
|
blk_tracer_stop(tr);
|
|
}
|
|
|
|
static const struct {
|
|
const char *act[2];
|
|
void (*print)(struct trace_seq *s, const struct trace_entry *ent);
|
|
} what2act[] = {
|
|
[__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic },
|
|
[__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic },
|
|
[__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic },
|
|
[__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic },
|
|
[__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic },
|
|
[__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error },
|
|
[__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic },
|
|
[__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error },
|
|
[__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug },
|
|
[__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug },
|
|
[__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug },
|
|
[__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic },
|
|
[__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split },
|
|
[__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic },
|
|
[__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap },
|
|
};
|
|
|
|
static enum print_line_t print_one_line(struct trace_iterator *iter,
|
|
bool classic)
|
|
{
|
|
struct trace_array *tr = iter->tr;
|
|
struct trace_seq *s = &iter->seq;
|
|
const struct blk_io_trace *t;
|
|
u16 what;
|
|
bool long_act;
|
|
blk_log_action_t *log_action;
|
|
|
|
t = te_blk_io_trace(iter->ent);
|
|
what = t->action & ((1 << BLK_TC_SHIFT) - 1);
|
|
long_act = !!(tr->trace_flags & TRACE_ITER_VERBOSE);
|
|
log_action = classic ? &blk_log_action_classic : &blk_log_action;
|
|
|
|
if (t->action == BLK_TN_MESSAGE) {
|
|
log_action(iter, long_act ? "message" : "m");
|
|
blk_log_msg(s, iter->ent);
|
|
return trace_handle_return(s);
|
|
}
|
|
|
|
if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act)))
|
|
trace_seq_printf(s, "Unknown action %x\n", what);
|
|
else {
|
|
log_action(iter, what2act[what].act[long_act]);
|
|
what2act[what].print(s, iter->ent);
|
|
}
|
|
|
|
return trace_handle_return(s);
|
|
}
|
|
|
|
static enum print_line_t blk_trace_event_print(struct trace_iterator *iter,
|
|
int flags, struct trace_event *event)
|
|
{
|
|
return print_one_line(iter, false);
|
|
}
|
|
|
|
static void blk_trace_synthesize_old_trace(struct trace_iterator *iter)
|
|
{
|
|
struct trace_seq *s = &iter->seq;
|
|
struct blk_io_trace *t = (struct blk_io_trace *)iter->ent;
|
|
const int offset = offsetof(struct blk_io_trace, sector);
|
|
struct blk_io_trace old = {
|
|
.magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION,
|
|
.time = iter->ts,
|
|
};
|
|
|
|
trace_seq_putmem(s, &old, offset);
|
|
trace_seq_putmem(s, &t->sector,
|
|
sizeof(old) - offset + t->pdu_len);
|
|
}
|
|
|
|
static enum print_line_t
|
|
blk_trace_event_print_binary(struct trace_iterator *iter, int flags,
|
|
struct trace_event *event)
|
|
{
|
|
blk_trace_synthesize_old_trace(iter);
|
|
|
|
return trace_handle_return(&iter->seq);
|
|
}
|
|
|
|
static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter)
|
|
{
|
|
if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC))
|
|
return TRACE_TYPE_UNHANDLED;
|
|
|
|
return print_one_line(iter, true);
|
|
}
|
|
|
|
static int
|
|
blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
|
|
{
|
|
/* don't output context-info for blk_classic output */
|
|
if (bit == TRACE_BLK_OPT_CLASSIC) {
|
|
if (set)
|
|
tr->trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
|
|
else
|
|
tr->trace_flags |= TRACE_ITER_CONTEXT_INFO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct tracer blk_tracer __read_mostly = {
|
|
.name = "blk",
|
|
.init = blk_tracer_init,
|
|
.reset = blk_tracer_reset,
|
|
.start = blk_tracer_start,
|
|
.stop = blk_tracer_stop,
|
|
.print_header = blk_tracer_print_header,
|
|
.print_line = blk_tracer_print_line,
|
|
.flags = &blk_tracer_flags,
|
|
.set_flag = blk_tracer_set_flag,
|
|
};
|
|
|
|
static struct trace_event_functions trace_blk_event_funcs = {
|
|
.trace = blk_trace_event_print,
|
|
.binary = blk_trace_event_print_binary,
|
|
};
|
|
|
|
static struct trace_event trace_blk_event = {
|
|
.type = TRACE_BLK,
|
|
.funcs = &trace_blk_event_funcs,
|
|
};
|
|
|
|
static int __init init_blk_tracer(void)
|
|
{
|
|
if (!register_trace_event(&trace_blk_event)) {
|
|
pr_warn("Warning: could not register block events\n");
|
|
return 1;
|
|
}
|
|
|
|
if (register_tracer(&blk_tracer) != 0) {
|
|
pr_warn("Warning: could not register the block tracer\n");
|
|
unregister_trace_event(&trace_blk_event);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(init_blk_tracer);
|
|
|
|
static int blk_trace_remove_queue(struct request_queue *q)
|
|
{
|
|
struct blk_trace *bt;
|
|
|
|
bt = xchg(&q->blk_trace, NULL);
|
|
if (bt == NULL)
|
|
return -EINVAL;
|
|
|
|
if (atomic_dec_and_test(&blk_probes_ref))
|
|
blk_unregister_tracepoints();
|
|
|
|
blk_trace_free(bt);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Setup everything required to start tracing
|
|
*/
|
|
static int blk_trace_setup_queue(struct request_queue *q,
|
|
struct block_device *bdev)
|
|
{
|
|
struct blk_trace *bt = NULL;
|
|
int ret = -ENOMEM;
|
|
|
|
bt = kzalloc(sizeof(*bt), GFP_KERNEL);
|
|
if (!bt)
|
|
return -ENOMEM;
|
|
|
|
bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG, __alignof__(char));
|
|
if (!bt->msg_data)
|
|
goto free_bt;
|
|
|
|
bt->dev = bdev->bd_dev;
|
|
bt->act_mask = (u16)-1;
|
|
|
|
blk_trace_setup_lba(bt, bdev);
|
|
|
|
ret = -EBUSY;
|
|
if (cmpxchg(&q->blk_trace, NULL, bt))
|
|
goto free_bt;
|
|
|
|
if (atomic_inc_return(&blk_probes_ref) == 1)
|
|
blk_register_tracepoints();
|
|
return 0;
|
|
|
|
free_bt:
|
|
blk_trace_free(bt);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* sysfs interface to enable and configure tracing
|
|
*/
|
|
|
|
static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf);
|
|
static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
#define BLK_TRACE_DEVICE_ATTR(_name) \
|
|
DEVICE_ATTR(_name, S_IRUGO | S_IWUSR, \
|
|
sysfs_blk_trace_attr_show, \
|
|
sysfs_blk_trace_attr_store)
|
|
|
|
static BLK_TRACE_DEVICE_ATTR(enable);
|
|
static BLK_TRACE_DEVICE_ATTR(act_mask);
|
|
static BLK_TRACE_DEVICE_ATTR(pid);
|
|
static BLK_TRACE_DEVICE_ATTR(start_lba);
|
|
static BLK_TRACE_DEVICE_ATTR(end_lba);
|
|
|
|
static struct attribute *blk_trace_attrs[] = {
|
|
&dev_attr_enable.attr,
|
|
&dev_attr_act_mask.attr,
|
|
&dev_attr_pid.attr,
|
|
&dev_attr_start_lba.attr,
|
|
&dev_attr_end_lba.attr,
|
|
NULL
|
|
};
|
|
|
|
struct attribute_group blk_trace_attr_group = {
|
|
.name = "trace",
|
|
.attrs = blk_trace_attrs,
|
|
};
|
|
|
|
static const struct {
|
|
int mask;
|
|
const char *str;
|
|
} mask_maps[] = {
|
|
{ BLK_TC_READ, "read" },
|
|
{ BLK_TC_WRITE, "write" },
|
|
{ BLK_TC_FLUSH, "flush" },
|
|
{ BLK_TC_SYNC, "sync" },
|
|
{ BLK_TC_QUEUE, "queue" },
|
|
{ BLK_TC_REQUEUE, "requeue" },
|
|
{ BLK_TC_ISSUE, "issue" },
|
|
{ BLK_TC_COMPLETE, "complete" },
|
|
{ BLK_TC_FS, "fs" },
|
|
{ BLK_TC_PC, "pc" },
|
|
{ BLK_TC_NOTIFY, "notify" },
|
|
{ BLK_TC_AHEAD, "ahead" },
|
|
{ BLK_TC_META, "meta" },
|
|
{ BLK_TC_DISCARD, "discard" },
|
|
{ BLK_TC_DRV_DATA, "drv_data" },
|
|
{ BLK_TC_FUA, "fua" },
|
|
};
|
|
|
|
static int blk_trace_str2mask(const char *str)
|
|
{
|
|
int i;
|
|
int mask = 0;
|
|
char *buf, *s, *token;
|
|
|
|
buf = kstrdup(str, GFP_KERNEL);
|
|
if (buf == NULL)
|
|
return -ENOMEM;
|
|
s = strstrip(buf);
|
|
|
|
while (1) {
|
|
token = strsep(&s, ",");
|
|
if (token == NULL)
|
|
break;
|
|
|
|
if (*token == '\0')
|
|
continue;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mask_maps); i++) {
|
|
if (strcasecmp(token, mask_maps[i].str) == 0) {
|
|
mask |= mask_maps[i].mask;
|
|
break;
|
|
}
|
|
}
|
|
if (i == ARRAY_SIZE(mask_maps)) {
|
|
mask = -EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
kfree(buf);
|
|
|
|
return mask;
|
|
}
|
|
|
|
static ssize_t blk_trace_mask2str(char *buf, int mask)
|
|
{
|
|
int i;
|
|
char *p = buf;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mask_maps); i++) {
|
|
if (mask & mask_maps[i].mask) {
|
|
p += sprintf(p, "%s%s",
|
|
(p == buf) ? "" : ",", mask_maps[i].str);
|
|
}
|
|
}
|
|
*p++ = '\n';
|
|
|
|
return p - buf;
|
|
}
|
|
|
|
static struct request_queue *blk_trace_get_queue(struct block_device *bdev)
|
|
{
|
|
if (bdev->bd_disk == NULL)
|
|
return NULL;
|
|
|
|
return bdev_get_queue(bdev);
|
|
}
|
|
|
|
static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct hd_struct *p = dev_to_part(dev);
|
|
struct request_queue *q;
|
|
struct block_device *bdev;
|
|
ssize_t ret = -ENXIO;
|
|
|
|
bdev = bdget(part_devt(p));
|
|
if (bdev == NULL)
|
|
goto out;
|
|
|
|
q = blk_trace_get_queue(bdev);
|
|
if (q == NULL)
|
|
goto out_bdput;
|
|
|
|
mutex_lock(&bdev->bd_mutex);
|
|
|
|
if (attr == &dev_attr_enable) {
|
|
ret = sprintf(buf, "%u\n", !!q->blk_trace);
|
|
goto out_unlock_bdev;
|
|
}
|
|
|
|
if (q->blk_trace == NULL)
|
|
ret = sprintf(buf, "disabled\n");
|
|
else if (attr == &dev_attr_act_mask)
|
|
ret = blk_trace_mask2str(buf, q->blk_trace->act_mask);
|
|
else if (attr == &dev_attr_pid)
|
|
ret = sprintf(buf, "%u\n", q->blk_trace->pid);
|
|
else if (attr == &dev_attr_start_lba)
|
|
ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba);
|
|
else if (attr == &dev_attr_end_lba)
|
|
ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba);
|
|
|
|
out_unlock_bdev:
|
|
mutex_unlock(&bdev->bd_mutex);
|
|
out_bdput:
|
|
bdput(bdev);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct block_device *bdev;
|
|
struct request_queue *q;
|
|
struct hd_struct *p;
|
|
u64 value;
|
|
ssize_t ret = -EINVAL;
|
|
|
|
if (count == 0)
|
|
goto out;
|
|
|
|
if (attr == &dev_attr_act_mask) {
|
|
if (sscanf(buf, "%llx", &value) != 1) {
|
|
/* Assume it is a list of trace category names */
|
|
ret = blk_trace_str2mask(buf);
|
|
if (ret < 0)
|
|
goto out;
|
|
value = ret;
|
|
}
|
|
} else if (sscanf(buf, "%llu", &value) != 1)
|
|
goto out;
|
|
|
|
ret = -ENXIO;
|
|
|
|
p = dev_to_part(dev);
|
|
bdev = bdget(part_devt(p));
|
|
if (bdev == NULL)
|
|
goto out;
|
|
|
|
q = blk_trace_get_queue(bdev);
|
|
if (q == NULL)
|
|
goto out_bdput;
|
|
|
|
mutex_lock(&bdev->bd_mutex);
|
|
|
|
if (attr == &dev_attr_enable) {
|
|
if (value)
|
|
ret = blk_trace_setup_queue(q, bdev);
|
|
else
|
|
ret = blk_trace_remove_queue(q);
|
|
goto out_unlock_bdev;
|
|
}
|
|
|
|
ret = 0;
|
|
if (q->blk_trace == NULL)
|
|
ret = blk_trace_setup_queue(q, bdev);
|
|
|
|
if (ret == 0) {
|
|
if (attr == &dev_attr_act_mask)
|
|
q->blk_trace->act_mask = value;
|
|
else if (attr == &dev_attr_pid)
|
|
q->blk_trace->pid = value;
|
|
else if (attr == &dev_attr_start_lba)
|
|
q->blk_trace->start_lba = value;
|
|
else if (attr == &dev_attr_end_lba)
|
|
q->blk_trace->end_lba = value;
|
|
}
|
|
|
|
out_unlock_bdev:
|
|
mutex_unlock(&bdev->bd_mutex);
|
|
out_bdput:
|
|
bdput(bdev);
|
|
out:
|
|
return ret ? ret : count;
|
|
}
|
|
|
|
int blk_trace_init_sysfs(struct device *dev)
|
|
{
|
|
return sysfs_create_group(&dev->kobj, &blk_trace_attr_group);
|
|
}
|
|
|
|
void blk_trace_remove_sysfs(struct device *dev)
|
|
{
|
|
sysfs_remove_group(&dev->kobj, &blk_trace_attr_group);
|
|
}
|
|
|
|
#endif /* CONFIG_BLK_DEV_IO_TRACE */
|
|
|
|
#ifdef CONFIG_EVENT_TRACING
|
|
|
|
void blk_dump_cmd(char *buf, struct request *rq)
|
|
{
|
|
int i, end;
|
|
int len = rq->cmd_len;
|
|
unsigned char *cmd = rq->cmd;
|
|
|
|
if (rq->cmd_type != REQ_TYPE_BLOCK_PC) {
|
|
buf[0] = '\0';
|
|
return;
|
|
}
|
|
|
|
for (end = len - 1; end >= 0; end--)
|
|
if (cmd[end])
|
|
break;
|
|
end++;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]);
|
|
if (i == end && end != len - 1) {
|
|
sprintf(buf, " ..");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void blk_fill_rwbs(char *rwbs, int op, u32 rw, int bytes)
|
|
{
|
|
int i = 0;
|
|
|
|
if (rw & REQ_PREFLUSH)
|
|
rwbs[i++] = 'F';
|
|
|
|
switch (op) {
|
|
case REQ_OP_WRITE:
|
|
case REQ_OP_WRITE_SAME:
|
|
rwbs[i++] = 'W';
|
|
break;
|
|
case REQ_OP_DISCARD:
|
|
rwbs[i++] = 'D';
|
|
break;
|
|
case REQ_OP_SECURE_ERASE:
|
|
rwbs[i++] = 'D';
|
|
rwbs[i++] = 'E';
|
|
break;
|
|
case REQ_OP_FLUSH:
|
|
rwbs[i++] = 'F';
|
|
break;
|
|
case REQ_OP_READ:
|
|
rwbs[i++] = 'R';
|
|
break;
|
|
default:
|
|
rwbs[i++] = 'N';
|
|
}
|
|
|
|
if (rw & REQ_FUA)
|
|
rwbs[i++] = 'F';
|
|
if (rw & REQ_RAHEAD)
|
|
rwbs[i++] = 'A';
|
|
if (rw & REQ_SYNC)
|
|
rwbs[i++] = 'S';
|
|
if (rw & REQ_META)
|
|
rwbs[i++] = 'M';
|
|
|
|
rwbs[i] = '\0';
|
|
}
|
|
EXPORT_SYMBOL_GPL(blk_fill_rwbs);
|
|
|
|
#endif /* CONFIG_EVENT_TRACING */
|
|
|