NVMe: Add tracepoints
Adding tracepoints for bio_complete and block_split into nvme to help with gathering IO info using blktrace and blkparse. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
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@ -43,6 +43,7 @@
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_remap);
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_rq_remap);
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_complete);
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_split);
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_unplug);
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DEFINE_IDA(blk_queue_ida);
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@ -42,6 +42,8 @@
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#include <scsi/sg.h>
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#include <asm-generic/io-64-nonatomic-lo-hi.h>
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#include <trace/events/block.h>
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#define NVME_Q_DEPTH 1024
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#define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
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#define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion))
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@ -411,6 +413,7 @@ static void bio_completion(struct nvme_queue *nvmeq, void *ctx,
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struct nvme_iod *iod = ctx;
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struct bio *bio = iod->private;
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u16 status = le16_to_cpup(&cqe->status) >> 1;
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int error = 0;
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if (unlikely(status)) {
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if (!(status & NVME_SC_DNR ||
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@ -423,6 +426,7 @@ static void bio_completion(struct nvme_queue *nvmeq, void *ctx,
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wake_up(&nvmeq->sq_full);
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return;
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}
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error = -EIO;
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}
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if (iod->nents) {
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dma_unmap_sg(nvmeq->q_dmadev, iod->sg, iod->nents,
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@ -430,10 +434,9 @@ static void bio_completion(struct nvme_queue *nvmeq, void *ctx,
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nvme_end_io_acct(bio, iod->start_time);
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}
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nvme_free_iod(nvmeq->dev, iod);
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if (status)
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bio_endio(bio, -EIO);
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else
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bio_endio(bio, 0);
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trace_block_bio_complete(bdev_get_queue(bio->bi_bdev), bio, error);
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bio_endio(bio, error);
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}
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/* length is in bytes. gfp flags indicates whether we may sleep. */
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@ -522,6 +525,8 @@ static int nvme_split_and_submit(struct bio *bio, struct nvme_queue *nvmeq,
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if (!split)
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return -ENOMEM;
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trace_block_split(bdev_get_queue(bio->bi_bdev), bio,
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split->bi_iter.bi_sector);
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bio_chain(split, bio);
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if (!waitqueue_active(&nvmeq->sq_full))
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