#include <linux/blk-mq.h>
#include "blk.h"
#include "blk-mq.h"
+#include "blk-mq-debugfs.h"
#include "blk-mq-tag.h"
-struct blk_mq_debugfs_attr {
- const char *name;
- umode_t mode;
- const struct file_operations *fops;
-};
-
-static int blk_mq_debugfs_seq_open(struct inode *inode, struct file *file,
- const struct seq_operations *ops)
+static int blk_flags_show(struct seq_file *m, const unsigned long flags,
+ const char *const *flag_name, int flag_name_count)
{
- struct seq_file *m;
- int ret;
+ bool sep = false;
+ int i;
- ret = seq_open(file, ops);
- if (!ret) {
- m = file->private_data;
- m->private = inode->i_private;
+ for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
+ if (!(flags & BIT(i)))
+ continue;
+ if (sep)
+ seq_puts(m, "|");
+ sep = true;
+ if (i < flag_name_count && flag_name[i])
+ seq_puts(m, flag_name[i]);
+ else
+ seq_printf(m, "%d", i);
}
- return ret;
+ return 0;
}
-static int hctx_state_show(struct seq_file *m, void *v)
+#define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
+static const char *const blk_queue_flag_name[] = {
+ QUEUE_FLAG_NAME(QUEUED),
+ QUEUE_FLAG_NAME(STOPPED),
+ QUEUE_FLAG_NAME(SYNCFULL),
+ QUEUE_FLAG_NAME(ASYNCFULL),
+ QUEUE_FLAG_NAME(DYING),
+ QUEUE_FLAG_NAME(BYPASS),
+ QUEUE_FLAG_NAME(BIDI),
+ QUEUE_FLAG_NAME(NOMERGES),
+ QUEUE_FLAG_NAME(SAME_COMP),
+ QUEUE_FLAG_NAME(FAIL_IO),
+ QUEUE_FLAG_NAME(STACKABLE),
+ QUEUE_FLAG_NAME(NONROT),
+ QUEUE_FLAG_NAME(IO_STAT),
+ QUEUE_FLAG_NAME(DISCARD),
+ QUEUE_FLAG_NAME(NOXMERGES),
+ QUEUE_FLAG_NAME(ADD_RANDOM),
+ QUEUE_FLAG_NAME(SECERASE),
+ QUEUE_FLAG_NAME(SAME_FORCE),
+ QUEUE_FLAG_NAME(DEAD),
+ QUEUE_FLAG_NAME(INIT_DONE),
+ QUEUE_FLAG_NAME(NO_SG_MERGE),
+ QUEUE_FLAG_NAME(POLL),
+ QUEUE_FLAG_NAME(WC),
+ QUEUE_FLAG_NAME(FUA),
+ QUEUE_FLAG_NAME(FLUSH_NQ),
+ QUEUE_FLAG_NAME(DAX),
+ QUEUE_FLAG_NAME(STATS),
+ QUEUE_FLAG_NAME(POLL_STATS),
+ QUEUE_FLAG_NAME(REGISTERED),
+};
+#undef QUEUE_FLAG_NAME
+
+static int queue_state_show(void *data, struct seq_file *m)
{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct request_queue *q = data;
- seq_printf(m, "0x%lx\n", hctx->state);
+ blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
+ ARRAY_SIZE(blk_queue_flag_name));
+ seq_puts(m, "\n");
return 0;
}
-static int hctx_state_open(struct inode *inode, struct file *file)
+static ssize_t queue_state_write(void *data, const char __user *buf,
+ size_t count, loff_t *ppos)
{
- return single_open(file, hctx_state_show, inode->i_private);
+ struct request_queue *q = data;
+ char opbuf[16] = { }, *op;
+
+ /*
+ * The "state" attribute is removed after blk_cleanup_queue() has called
+ * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid
+ * triggering a use-after-free.
+ */
+ if (blk_queue_dead(q))
+ return -ENOENT;
+
+ if (count >= sizeof(opbuf)) {
+ pr_err("%s: operation too long\n", __func__);
+ goto inval;
+ }
+
+ if (copy_from_user(opbuf, buf, count))
+ return -EFAULT;
+ op = strstrip(opbuf);
+ if (strcmp(op, "run") == 0) {
+ blk_mq_run_hw_queues(q, true);
+ } else if (strcmp(op, "start") == 0) {
+ blk_mq_start_stopped_hw_queues(q, true);
+ } else {
+ pr_err("%s: unsupported operation '%s'\n", __func__, op);
+inval:
+ pr_err("%s: use either 'run' or 'start'\n", __func__);
+ return -EINVAL;
+ }
+ return count;
}
-static const struct file_operations hctx_state_fops = {
- .open = hctx_state_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
+static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
+{
+ if (stat->nr_samples) {
+ seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu",
+ stat->nr_samples, stat->mean, stat->min, stat->max);
+ } else {
+ seq_puts(m, "samples=0");
+ }
+}
-static int hctx_flags_show(struct seq_file *m, void *v)
+static int queue_poll_stat_show(void *data, struct seq_file *m)
{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct request_queue *q = data;
+ int bucket;
- seq_printf(m, "0x%lx\n", hctx->flags);
+ for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) {
+ seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket));
+ print_stat(m, &q->poll_stat[2*bucket]);
+ seq_puts(m, "\n");
+
+ seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket));
+ print_stat(m, &q->poll_stat[2*bucket+1]);
+ seq_puts(m, "\n");
+ }
return 0;
}
-static int hctx_flags_open(struct inode *inode, struct file *file)
+#define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
+static const char *const hctx_state_name[] = {
+ HCTX_STATE_NAME(STOPPED),
+ HCTX_STATE_NAME(TAG_ACTIVE),
+ HCTX_STATE_NAME(SCHED_RESTART),
+ HCTX_STATE_NAME(TAG_WAITING),
+ HCTX_STATE_NAME(START_ON_RUN),
+};
+#undef HCTX_STATE_NAME
+
+static int hctx_state_show(void *data, struct seq_file *m)
{
- return single_open(file, hctx_flags_show, inode->i_private);
+ struct blk_mq_hw_ctx *hctx = data;
+
+ blk_flags_show(m, hctx->state, hctx_state_name,
+ ARRAY_SIZE(hctx_state_name));
+ seq_puts(m, "\n");
+ return 0;
}
-static const struct file_operations hctx_flags_fops = {
- .open = hctx_flags_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
+#define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
+static const char *const alloc_policy_name[] = {
+ BLK_TAG_ALLOC_NAME(FIFO),
+ BLK_TAG_ALLOC_NAME(RR),
};
+#undef BLK_TAG_ALLOC_NAME
+
+#define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
+static const char *const hctx_flag_name[] = {
+ HCTX_FLAG_NAME(SHOULD_MERGE),
+ HCTX_FLAG_NAME(TAG_SHARED),
+ HCTX_FLAG_NAME(SG_MERGE),
+ HCTX_FLAG_NAME(BLOCKING),
+ HCTX_FLAG_NAME(NO_SCHED),
+};
+#undef HCTX_FLAG_NAME
+
+static int hctx_flags_show(void *data, struct seq_file *m)
+{
+ struct blk_mq_hw_ctx *hctx = data;
+ const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
+
+ seq_puts(m, "alloc_policy=");
+ if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
+ alloc_policy_name[alloc_policy])
+ seq_puts(m, alloc_policy_name[alloc_policy]);
+ else
+ seq_printf(m, "%d", alloc_policy);
+ seq_puts(m, " ");
+ blk_flags_show(m,
+ hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
+ hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
+ seq_puts(m, "\n");
+ return 0;
+}
-static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
-{
- struct request *rq = list_entry_rq(v);
-
- seq_printf(m, "%p {.cmd_flags=0x%x, .rq_flags=0x%x, .tag=%d, .internal_tag=%d}\n",
- rq, rq->cmd_flags, (__force unsigned int)rq->rq_flags,
- rq->tag, rq->internal_tag);
+#define REQ_OP_NAME(name) [REQ_OP_##name] = #name
+static const char *const op_name[] = {
+ REQ_OP_NAME(READ),
+ REQ_OP_NAME(WRITE),
+ REQ_OP_NAME(FLUSH),
+ REQ_OP_NAME(DISCARD),
+ REQ_OP_NAME(ZONE_REPORT),
+ REQ_OP_NAME(SECURE_ERASE),
+ REQ_OP_NAME(ZONE_RESET),
+ REQ_OP_NAME(WRITE_SAME),
+ REQ_OP_NAME(WRITE_ZEROES),
+ REQ_OP_NAME(SCSI_IN),
+ REQ_OP_NAME(SCSI_OUT),
+ REQ_OP_NAME(DRV_IN),
+ REQ_OP_NAME(DRV_OUT),
+};
+#undef REQ_OP_NAME
+
+#define CMD_FLAG_NAME(name) [__REQ_##name] = #name
+static const char *const cmd_flag_name[] = {
+ CMD_FLAG_NAME(FAILFAST_DEV),
+ CMD_FLAG_NAME(FAILFAST_TRANSPORT),
+ CMD_FLAG_NAME(FAILFAST_DRIVER),
+ CMD_FLAG_NAME(SYNC),
+ CMD_FLAG_NAME(META),
+ CMD_FLAG_NAME(PRIO),
+ CMD_FLAG_NAME(NOMERGE),
+ CMD_FLAG_NAME(IDLE),
+ CMD_FLAG_NAME(INTEGRITY),
+ CMD_FLAG_NAME(FUA),
+ CMD_FLAG_NAME(PREFLUSH),
+ CMD_FLAG_NAME(RAHEAD),
+ CMD_FLAG_NAME(BACKGROUND),
+ CMD_FLAG_NAME(NOUNMAP),
+};
+#undef CMD_FLAG_NAME
+
+#define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
+static const char *const rqf_name[] = {
+ RQF_NAME(SORTED),
+ RQF_NAME(STARTED),
+ RQF_NAME(QUEUED),
+ RQF_NAME(SOFTBARRIER),
+ RQF_NAME(FLUSH_SEQ),
+ RQF_NAME(MIXED_MERGE),
+ RQF_NAME(MQ_INFLIGHT),
+ RQF_NAME(DONTPREP),
+ RQF_NAME(PREEMPT),
+ RQF_NAME(COPY_USER),
+ RQF_NAME(FAILED),
+ RQF_NAME(QUIET),
+ RQF_NAME(ELVPRIV),
+ RQF_NAME(IO_STAT),
+ RQF_NAME(ALLOCED),
+ RQF_NAME(PM),
+ RQF_NAME(HASHED),
+ RQF_NAME(STATS),
+ RQF_NAME(SPECIAL_PAYLOAD),
+};
+#undef RQF_NAME
+
+int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
+{
+ const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
+ const unsigned int op = rq->cmd_flags & REQ_OP_MASK;
+
+ seq_printf(m, "%p {.op=", rq);
+ if (op < ARRAY_SIZE(op_name) && op_name[op])
+ seq_printf(m, "%s", op_name[op]);
+ else
+ seq_printf(m, "%d", op);
+ seq_puts(m, ", .cmd_flags=");
+ blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
+ ARRAY_SIZE(cmd_flag_name));
+ seq_puts(m, ", .rq_flags=");
+ blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
+ ARRAY_SIZE(rqf_name));
+ seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
+ rq->internal_tag);
+ if (mq_ops->show_rq)
+ mq_ops->show_rq(m, rq);
+ seq_puts(m, "}\n");
return 0;
}
+EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
+
+int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
+{
+ return __blk_mq_debugfs_rq_show(m, list_entry_rq(v));
+}
+EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
__acquires(&hctx->lock)
.show = blk_mq_debugfs_rq_show,
};
-static int hctx_dispatch_open(struct inode *inode, struct file *file)
-{
- return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops);
-}
-
-static const struct file_operations hctx_dispatch_fops = {
- .open = hctx_dispatch_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-
-static int hctx_ctx_map_show(struct seq_file *m, void *v)
+static int hctx_ctx_map_show(void *data, struct seq_file *m)
{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
sbitmap_bitmap_show(&hctx->ctx_map, m);
return 0;
}
-static int hctx_ctx_map_open(struct inode *inode, struct file *file)
-{
- return single_open(file, hctx_ctx_map_show, inode->i_private);
-}
-
-static const struct file_operations hctx_ctx_map_fops = {
- .open = hctx_ctx_map_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
static void blk_mq_debugfs_tags_show(struct seq_file *m,
struct blk_mq_tags *tags)
{
}
}
-static int hctx_tags_show(struct seq_file *m, void *v)
+static int hctx_tags_show(void *data, struct seq_file *m)
{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
struct request_queue *q = hctx->queue;
int res;
return res;
}
-static int hctx_tags_open(struct inode *inode, struct file *file)
-{
- return single_open(file, hctx_tags_show, inode->i_private);
-}
-
-static const struct file_operations hctx_tags_fops = {
- .open = hctx_tags_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int hctx_tags_bitmap_show(struct seq_file *m, void *v)
+static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
struct request_queue *q = hctx->queue;
int res;
return res;
}
-static int hctx_tags_bitmap_open(struct inode *inode, struct file *file)
+static int hctx_sched_tags_show(void *data, struct seq_file *m)
{
- return single_open(file, hctx_tags_bitmap_show, inode->i_private);
-}
-
-static const struct file_operations hctx_tags_bitmap_fops = {
- .open = hctx_tags_bitmap_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int hctx_sched_tags_show(struct seq_file *m, void *v)
-{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
struct request_queue *q = hctx->queue;
int res;
return res;
}
-static int hctx_sched_tags_open(struct inode *inode, struct file *file)
+static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
{
- return single_open(file, hctx_sched_tags_show, inode->i_private);
-}
-
-static const struct file_operations hctx_sched_tags_fops = {
- .open = hctx_sched_tags_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v)
-{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
struct request_queue *q = hctx->queue;
int res;
return res;
}
-static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file)
-{
- return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private);
-}
-
-static const struct file_operations hctx_sched_tags_bitmap_fops = {
- .open = hctx_sched_tags_bitmap_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int hctx_io_poll_show(struct seq_file *m, void *v)
+static int hctx_io_poll_show(void *data, struct seq_file *m)
{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
seq_printf(m, "considered=%lu\n", hctx->poll_considered);
seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
return 0;
}
-static int hctx_io_poll_open(struct inode *inode, struct file *file)
-{
- return single_open(file, hctx_io_poll_show, inode->i_private);
-}
-
-static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf,
+static ssize_t hctx_io_poll_write(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct seq_file *m = file->private_data;
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
return count;
}
-static const struct file_operations hctx_io_poll_fops = {
- .open = hctx_io_poll_open,
- .read = seq_read,
- .write = hctx_io_poll_write,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
-{
- seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu",
- stat->nr_samples, stat->mean, stat->min, stat->max);
-}
-
-static int hctx_stats_show(struct seq_file *m, void *v)
-{
- struct blk_mq_hw_ctx *hctx = m->private;
- struct blk_rq_stat stat[2];
-
- blk_stat_init(&stat[BLK_STAT_READ]);
- blk_stat_init(&stat[BLK_STAT_WRITE]);
-
- blk_hctx_stat_get(hctx, stat);
-
- seq_puts(m, "read: ");
- print_stat(m, &stat[BLK_STAT_READ]);
- seq_puts(m, "\n");
-
- seq_puts(m, "write: ");
- print_stat(m, &stat[BLK_STAT_WRITE]);
- seq_puts(m, "\n");
- return 0;
-}
-
-static int hctx_stats_open(struct inode *inode, struct file *file)
-{
- return single_open(file, hctx_stats_show, inode->i_private);
-}
-
-static ssize_t hctx_stats_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct seq_file *m = file->private_data;
- struct blk_mq_hw_ctx *hctx = m->private;
- struct blk_mq_ctx *ctx;
- int i;
-
- hctx_for_each_ctx(hctx, ctx, i) {
- blk_stat_init(&ctx->stat[BLK_STAT_READ]);
- blk_stat_init(&ctx->stat[BLK_STAT_WRITE]);
- }
- return count;
-}
-
-static const struct file_operations hctx_stats_fops = {
- .open = hctx_stats_open,
- .read = seq_read,
- .write = hctx_stats_write,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int hctx_dispatched_show(struct seq_file *m, void *v)
+static int hctx_dispatched_show(void *data, struct seq_file *m)
{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
int i;
seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
return 0;
}
-static int hctx_dispatched_open(struct inode *inode, struct file *file)
-{
- return single_open(file, hctx_dispatched_show, inode->i_private);
-}
-
-static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf,
+static ssize_t hctx_dispatched_write(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct seq_file *m = file->private_data;
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
int i;
for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
return count;
}
-static const struct file_operations hctx_dispatched_fops = {
- .open = hctx_dispatched_open,
- .read = seq_read,
- .write = hctx_dispatched_write,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int hctx_queued_show(struct seq_file *m, void *v)
+static int hctx_queued_show(void *data, struct seq_file *m)
{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
seq_printf(m, "%lu\n", hctx->queued);
return 0;
}
-static int hctx_queued_open(struct inode *inode, struct file *file)
-{
- return single_open(file, hctx_queued_show, inode->i_private);
-}
-
-static ssize_t hctx_queued_write(struct file *file, const char __user *buf,
+static ssize_t hctx_queued_write(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct seq_file *m = file->private_data;
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
hctx->queued = 0;
return count;
}
-static const struct file_operations hctx_queued_fops = {
- .open = hctx_queued_open,
- .read = seq_read,
- .write = hctx_queued_write,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int hctx_run_show(struct seq_file *m, void *v)
+static int hctx_run_show(void *data, struct seq_file *m)
{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
seq_printf(m, "%lu\n", hctx->run);
return 0;
}
-static int hctx_run_open(struct inode *inode, struct file *file)
+static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
+ loff_t *ppos)
{
- return single_open(file, hctx_run_show, inode->i_private);
-}
-
-static ssize_t hctx_run_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct seq_file *m = file->private_data;
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
hctx->run = 0;
return count;
}
-static const struct file_operations hctx_run_fops = {
- .open = hctx_run_open,
- .read = seq_read,
- .write = hctx_run_write,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int hctx_active_show(struct seq_file *m, void *v)
+static int hctx_active_show(void *data, struct seq_file *m)
{
- struct blk_mq_hw_ctx *hctx = m->private;
+ struct blk_mq_hw_ctx *hctx = data;
seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
return 0;
}
-static int hctx_active_open(struct inode *inode, struct file *file)
-{
- return single_open(file, hctx_active_show, inode->i_private);
-}
-
-static const struct file_operations hctx_active_fops = {
- .open = hctx_active_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)
__acquires(&ctx->lock)
{
.stop = ctx_rq_list_stop,
.show = blk_mq_debugfs_rq_show,
};
-
-static int ctx_rq_list_open(struct inode *inode, struct file *file)
-{
- return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops);
-}
-
-static const struct file_operations ctx_rq_list_fops = {
- .open = ctx_rq_list_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-
-static int ctx_dispatched_show(struct seq_file *m, void *v)
+static int ctx_dispatched_show(void *data, struct seq_file *m)
{
- struct blk_mq_ctx *ctx = m->private;
+ struct blk_mq_ctx *ctx = data;
seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
return 0;
}
-static int ctx_dispatched_open(struct inode *inode, struct file *file)
-{
- return single_open(file, ctx_dispatched_show, inode->i_private);
-}
-
-static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf,
+static ssize_t ctx_dispatched_write(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct seq_file *m = file->private_data;
- struct blk_mq_ctx *ctx = m->private;
+ struct blk_mq_ctx *ctx = data;
ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
return count;
}
-static const struct file_operations ctx_dispatched_fops = {
- .open = ctx_dispatched_open,
- .read = seq_read,
- .write = ctx_dispatched_write,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int ctx_merged_show(struct seq_file *m, void *v)
+static int ctx_merged_show(void *data, struct seq_file *m)
{
- struct blk_mq_ctx *ctx = m->private;
+ struct blk_mq_ctx *ctx = data;
seq_printf(m, "%lu\n", ctx->rq_merged);
return 0;
}
-static int ctx_merged_open(struct inode *inode, struct file *file)
-{
- return single_open(file, ctx_merged_show, inode->i_private);
-}
-
-static ssize_t ctx_merged_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
+static ssize_t ctx_merged_write(void *data, const char __user *buf,
+ size_t count, loff_t *ppos)
{
- struct seq_file *m = file->private_data;
- struct blk_mq_ctx *ctx = m->private;
+ struct blk_mq_ctx *ctx = data;
ctx->rq_merged = 0;
return count;
}
-static const struct file_operations ctx_merged_fops = {
- .open = ctx_merged_open,
- .read = seq_read,
- .write = ctx_merged_write,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int ctx_completed_show(struct seq_file *m, void *v)
+static int ctx_completed_show(void *data, struct seq_file *m)
{
- struct blk_mq_ctx *ctx = m->private;
+ struct blk_mq_ctx *ctx = data;
seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
return 0;
}
-static int ctx_completed_open(struct inode *inode, struct file *file)
+static ssize_t ctx_completed_write(void *data, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct blk_mq_ctx *ctx = data;
+
+ ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
+ return count;
+}
+
+static int blk_mq_debugfs_show(struct seq_file *m, void *v)
{
- return single_open(file, ctx_completed_show, inode->i_private);
+ const struct blk_mq_debugfs_attr *attr = m->private;
+ void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
+
+ return attr->show(data, m);
}
-static ssize_t ctx_completed_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
+static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
{
struct seq_file *m = file->private_data;
- struct blk_mq_ctx *ctx = m->private;
+ const struct blk_mq_debugfs_attr *attr = m->private;
+ void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
- ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
- return count;
+ if (!attr->write)
+ return -EPERM;
+
+ return attr->write(data, buf, count, ppos);
+}
+
+static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
+{
+ const struct blk_mq_debugfs_attr *attr = inode->i_private;
+ void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
+ struct seq_file *m;
+ int ret;
+
+ if (attr->seq_ops) {
+ ret = seq_open(file, attr->seq_ops);
+ if (!ret) {
+ m = file->private_data;
+ m->private = data;
+ }
+ return ret;
+ }
+
+ if (WARN_ON_ONCE(!attr->show))
+ return -EPERM;
+
+ return single_open(file, blk_mq_debugfs_show, inode->i_private);
}
-static const struct file_operations ctx_completed_fops = {
- .open = ctx_completed_open,
+static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
+{
+ const struct blk_mq_debugfs_attr *attr = inode->i_private;
+
+ if (attr->show)
+ return single_release(inode, file);
+ else
+ return seq_release(inode, file);
+}
+
+const struct file_operations blk_mq_debugfs_fops = {
+ .open = blk_mq_debugfs_open,
.read = seq_read,
- .write = ctx_completed_write,
+ .write = blk_mq_debugfs_write,
.llseek = seq_lseek,
- .release = single_release,
+ .release = blk_mq_debugfs_release,
+};
+
+static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
+ {"poll_stat", 0400, queue_poll_stat_show},
+ {"state", 0600, queue_state_show, queue_state_write},
+ {},
};
static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
- {"state", 0400, &hctx_state_fops},
- {"flags", 0400, &hctx_flags_fops},
- {"dispatch", 0400, &hctx_dispatch_fops},
- {"ctx_map", 0400, &hctx_ctx_map_fops},
- {"tags", 0400, &hctx_tags_fops},
- {"tags_bitmap", 0400, &hctx_tags_bitmap_fops},
- {"sched_tags", 0400, &hctx_sched_tags_fops},
- {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops},
- {"io_poll", 0600, &hctx_io_poll_fops},
- {"stats", 0600, &hctx_stats_fops},
- {"dispatched", 0600, &hctx_dispatched_fops},
- {"queued", 0600, &hctx_queued_fops},
- {"run", 0600, &hctx_run_fops},
- {"active", 0400, &hctx_active_fops},
+ {"state", 0400, hctx_state_show},
+ {"flags", 0400, hctx_flags_show},
+ {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
+ {"ctx_map", 0400, hctx_ctx_map_show},
+ {"tags", 0400, hctx_tags_show},
+ {"tags_bitmap", 0400, hctx_tags_bitmap_show},
+ {"sched_tags", 0400, hctx_sched_tags_show},
+ {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
+ {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write},
+ {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write},
+ {"queued", 0600, hctx_queued_show, hctx_queued_write},
+ {"run", 0600, hctx_run_show, hctx_run_write},
+ {"active", 0400, hctx_active_show},
{},
};
static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
- {"rq_list", 0400, &ctx_rq_list_fops},
- {"dispatched", 0600, &ctx_dispatched_fops},
- {"merged", 0600, &ctx_merged_fops},
- {"completed", 0600, &ctx_completed_fops},
+ {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops},
+ {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write},
+ {"merged", 0600, ctx_merged_show, ctx_merged_write},
+ {"completed", 0600, ctx_completed_show, ctx_completed_write},
{},
};
-int blk_mq_debugfs_register(struct request_queue *q, const char *name)
+static bool debugfs_create_files(struct dentry *parent, void *data,
+ const struct blk_mq_debugfs_attr *attr)
+{
+ d_inode(parent)->i_private = data;
+
+ for (; attr->name; attr++) {
+ if (!debugfs_create_file(attr->name, attr->mode, parent,
+ (void *)attr, &blk_mq_debugfs_fops))
+ return false;
+ }
+ return true;
+}
+
+int blk_mq_debugfs_register(struct request_queue *q)
{
+ struct blk_mq_hw_ctx *hctx;
+ int i;
+
if (!blk_debugfs_root)
return -ENOENT;
- q->debugfs_dir = debugfs_create_dir(name, blk_debugfs_root);
+ q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
+ blk_debugfs_root);
if (!q->debugfs_dir)
- goto err;
+ return -ENOMEM;
- if (blk_mq_debugfs_register_hctxs(q))
+ if (!debugfs_create_files(q->debugfs_dir, q,
+ blk_mq_debugfs_queue_attrs))
goto err;
+ /*
+ * blk_mq_init_hctx() attempted to do this already, but q->debugfs_dir
+ * didn't exist yet (because we don't know what to name the directory
+ * until the queue is registered to a gendisk).
+ */
+ queue_for_each_hw_ctx(q, hctx, i) {
+ if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx))
+ goto err;
+ if (q->elevator && !hctx->sched_debugfs_dir &&
+ blk_mq_debugfs_register_sched_hctx(q, hctx))
+ goto err;
+ }
+
return 0;
err:
void blk_mq_debugfs_unregister(struct request_queue *q)
{
debugfs_remove_recursive(q->debugfs_dir);
- q->mq_debugfs_dir = NULL;
+ q->sched_debugfs_dir = NULL;
q->debugfs_dir = NULL;
}
-static bool debugfs_create_files(struct dentry *parent, void *data,
- const struct blk_mq_debugfs_attr *attr)
-{
- for (; attr->name; attr++) {
- if (!debugfs_create_file(attr->name, attr->mode, parent,
- data, attr->fops))
- return false;
- }
- return true;
-}
-
-static int blk_mq_debugfs_register_ctx(struct request_queue *q,
- struct blk_mq_ctx *ctx,
- struct dentry *hctx_dir)
+static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
+ struct blk_mq_ctx *ctx)
{
struct dentry *ctx_dir;
char name[20];
snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
- ctx_dir = debugfs_create_dir(name, hctx_dir);
+ ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
if (!ctx_dir)
return -ENOMEM;
return 0;
}
-static int blk_mq_debugfs_register_hctx(struct request_queue *q,
- struct blk_mq_hw_ctx *hctx)
+int blk_mq_debugfs_register_hctx(struct request_queue *q,
+ struct blk_mq_hw_ctx *hctx)
{
struct blk_mq_ctx *ctx;
- struct dentry *hctx_dir;
char name[20];
int i;
- snprintf(name, sizeof(name), "%u", hctx->queue_num);
- hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir);
- if (!hctx_dir)
- return -ENOMEM;
+ if (!q->debugfs_dir)
+ return -ENOENT;
- if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs))
+ snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
+ hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
+ if (!hctx->debugfs_dir)
return -ENOMEM;
+ if (!debugfs_create_files(hctx->debugfs_dir, hctx,
+ blk_mq_debugfs_hctx_attrs))
+ goto err;
+
hctx_for_each_ctx(hctx, ctx, i) {
- if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir))
- return -ENOMEM;
+ if (blk_mq_debugfs_register_ctx(hctx, ctx))
+ goto err;
}
return 0;
+
+err:
+ blk_mq_debugfs_unregister_hctx(hctx);
+ return -ENOMEM;
+}
+
+void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
+{
+ debugfs_remove_recursive(hctx->debugfs_dir);
+ hctx->sched_debugfs_dir = NULL;
+ hctx->debugfs_dir = NULL;
}
int blk_mq_debugfs_register_hctxs(struct request_queue *q)
struct blk_mq_hw_ctx *hctx;
int i;
+ queue_for_each_hw_ctx(q, hctx, i) {
+ if (blk_mq_debugfs_register_hctx(q, hctx))
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
+{
+ struct blk_mq_hw_ctx *hctx;
+ int i;
+
+ queue_for_each_hw_ctx(q, hctx, i)
+ blk_mq_debugfs_unregister_hctx(hctx);
+}
+
+int blk_mq_debugfs_register_sched(struct request_queue *q)
+{
+ struct elevator_type *e = q->elevator->type;
+
if (!q->debugfs_dir)
return -ENOENT;
- q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir);
- if (!q->mq_debugfs_dir)
- goto err;
+ if (!e->queue_debugfs_attrs)
+ return 0;
- queue_for_each_hw_ctx(q, hctx, i) {
- if (blk_mq_debugfs_register_hctx(q, hctx))
- goto err;
- }
+ q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
+ if (!q->sched_debugfs_dir)
+ return -ENOMEM;
+
+ if (!debugfs_create_files(q->sched_debugfs_dir, q,
+ e->queue_debugfs_attrs))
+ goto err;
return 0;
err:
- blk_mq_debugfs_unregister_hctxs(q);
+ blk_mq_debugfs_unregister_sched(q);
return -ENOMEM;
}
-void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
+void blk_mq_debugfs_unregister_sched(struct request_queue *q)
+{
+ debugfs_remove_recursive(q->sched_debugfs_dir);
+ q->sched_debugfs_dir = NULL;
+}
+
+int blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
+ struct blk_mq_hw_ctx *hctx)
+{
+ struct elevator_type *e = q->elevator->type;
+
+ if (!hctx->debugfs_dir)
+ return -ENOENT;
+
+ if (!e->hctx_debugfs_attrs)
+ return 0;
+
+ hctx->sched_debugfs_dir = debugfs_create_dir("sched",
+ hctx->debugfs_dir);
+ if (!hctx->sched_debugfs_dir)
+ return -ENOMEM;
+
+ if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx,
+ e->hctx_debugfs_attrs))
+ return -ENOMEM;
+
+ return 0;
+}
+
+void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
{
- debugfs_remove_recursive(q->mq_debugfs_dir);
- q->mq_debugfs_dir = NULL;
+ debugfs_remove_recursive(hctx->sched_debugfs_dir);
+ hctx->sched_debugfs_dir = NULL;
}
projects / mirror_ubuntu-artful-kernel.git / blobdiff