From 43e2d08d0790a09ee1d2c838e33343ee1bcaf610 Mon Sep 17 00:00:00 2001 From: Max Gurtovoy Date: Mon, 25 Feb 2019 13:00:04 +0200 Subject: nvme: avoid double dereference to convert le to cpu Use le16_to_cpu instead of le16_to_cpup and le64_to_cpu instead of le64_to_cpup. This will also align the code to nvme-core driver convention. Signed-off-by: Max Gurtovoy Signed-off-by: Christoph Hellwig --- drivers/nvme/host/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 470601980794..b5939112b9b6 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1588,7 +1588,7 @@ static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b) static void nvme_update_disk_info(struct gendisk *disk, struct nvme_ns *ns, struct nvme_id_ns *id) { - sector_t capacity = le64_to_cpup(&id->nsze) << (ns->lba_shift - 9); + sector_t capacity = le64_to_cpu(id->nsze) << (ns->lba_shift - 9); unsigned short bs = 1 << ns->lba_shift; blk_mq_freeze_queue(disk->queue); @@ -2549,7 +2549,7 @@ int nvme_init_identify(struct nvme_ctrl *ctrl) ctrl->crdt[2] = le16_to_cpu(id->crdt3); ctrl->oacs = le16_to_cpu(id->oacs); - ctrl->oncs = le16_to_cpup(&id->oncs); + ctrl->oncs = le16_to_cpu(id->oncs); ctrl->oaes = le32_to_cpu(id->oaes); atomic_set(&ctrl->abort_limit, id->acl + 1); ctrl->vwc = id->vwc; -- cgit v1.2.1 From cfe03c2ec46200dfefa5167e6a2bb50c0426c5f4 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 12 Mar 2019 18:05:10 +0100 Subject: nvmet: avoid double errno conversions Use errno_to_nvme_status to convert from a negative errno to a nvme status field instead of going through a blk_status_t. Also remove the pointless status variable in nvmet_bdev_execute_write_zeroes. Signed-off-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/target/io-cmd-bdev.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c index a065dbfc43b1..3efc52f9c309 100644 --- a/drivers/nvme/target/io-cmd-bdev.c +++ b/drivers/nvme/target/io-cmd-bdev.c @@ -196,7 +196,7 @@ static u16 nvmet_bdev_discard_range(struct nvmet_req *req, GFP_KERNEL, 0, bio); if (ret && ret != -EOPNOTSUPP) { req->error_slba = le64_to_cpu(range->slba); - return blk_to_nvme_status(req, errno_to_blk_status(ret)); + return errno_to_nvme_status(req, ret); } return NVME_SC_SUCCESS; } @@ -252,7 +252,6 @@ static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req) { struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes; struct bio *bio = NULL; - u16 status = NVME_SC_SUCCESS; sector_t sector; sector_t nr_sector; int ret; @@ -264,13 +263,12 @@ static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req) ret = __blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector, GFP_KERNEL, &bio, 0); - status = blk_to_nvme_status(req, errno_to_blk_status(ret)); if (bio) { bio->bi_private = req; bio->bi_end_io = nvmet_bio_done; submit_bio(bio); } else { - nvmet_req_complete(req, status); + nvmet_req_complete(req, errno_to_nvme_status(req, ret)); } } -- cgit v1.2.1 From 6b80f1d2cc5a76f0121a43a612515bc8a8976e66 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Sat, 23 Feb 2019 12:51:08 -0600 Subject: nvmet-fc: use zero-sized array and struct_size() in kzalloc() Update the code to use a zero-sized array instead of a pointer in structure nvmet_fc_tgt_queue and use struct_size() in kzalloc(). Notice that one of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; struct boo entry[]; }; instance = kzalloc(sizeof(struct foo) + sizeof(struct boo) * count, GFP_KERNEL); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL); This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva Reviewed-by: James Smart Signed-off-by: Christoph Hellwig --- drivers/nvme/target/fc.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c index 98b7b1f4ee96..9369a11fe7a9 100644 --- a/drivers/nvme/target/fc.c +++ b/drivers/nvme/target/fc.c @@ -128,12 +128,12 @@ struct nvmet_fc_tgt_queue { struct nvmet_cq nvme_cq; struct nvmet_sq nvme_sq; struct nvmet_fc_tgt_assoc *assoc; - struct nvmet_fc_fcp_iod *fod; /* array of fcp_iods */ struct list_head fod_list; struct list_head pending_cmd_list; struct list_head avail_defer_list; struct workqueue_struct *work_q; struct kref ref; + struct nvmet_fc_fcp_iod fod[]; /* array of fcp_iods */ } __aligned(sizeof(unsigned long long)); struct nvmet_fc_tgt_assoc { @@ -588,9 +588,7 @@ nvmet_fc_alloc_target_queue(struct nvmet_fc_tgt_assoc *assoc, if (qid > NVMET_NR_QUEUES) return NULL; - queue = kzalloc((sizeof(*queue) + - (sizeof(struct nvmet_fc_fcp_iod) * sqsize)), - GFP_KERNEL); + queue = kzalloc(struct_size(queue, fod, sqsize), GFP_KERNEL); if (!queue) return NULL; @@ -603,7 +601,6 @@ nvmet_fc_alloc_target_queue(struct nvmet_fc_tgt_assoc *assoc, if (!queue->work_q) goto out_a_put; - queue->fod = (struct nvmet_fc_fcp_iod *)&queue[1]; queue->qid = qid; queue->sqsize = sqsize; queue->assoc = assoc; -- cgit v1.2.1 From 70583295388a3ceabc22bddeb16e788f58225d70 Mon Sep 17 00:00:00 2001 From: Sagi Grimberg Date: Fri, 8 Mar 2019 15:41:21 -0800 Subject: nvmet-tcp: implement C2HData SUCCESS optimization TP 8000 says that the use of the SUCCESS flag depends on weather the controller support disabling sq_head pointer updates. Given that we support it by default, makes sense that we go the extra mile to actually use the SUCCESS flag. When we create the C2HData PDU header, we check if sqhd_disabled is set on our queue, if so, we set the SUCCESS flag in the PDU header and skip sending a completion response capsule. Signed-off-by: Sagi Grimberg Reviewed-by: Oliver Smith-Denny Tested-by: Oliver Smith-Denny Signed-off-by: Christoph Hellwig --- drivers/nvme/target/tcp.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c index ad0df786fe93..0a941abf56ec 100644 --- a/drivers/nvme/target/tcp.c +++ b/drivers/nvme/target/tcp.c @@ -371,7 +371,8 @@ static void nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd *cmd) cmd->state = NVMET_TCP_SEND_DATA_PDU; pdu->hdr.type = nvme_tcp_c2h_data; - pdu->hdr.flags = NVME_TCP_F_DATA_LAST; + pdu->hdr.flags = NVME_TCP_F_DATA_LAST | (queue->nvme_sq.sqhd_disabled ? + NVME_TCP_F_DATA_SUCCESS : 0); pdu->hdr.hlen = sizeof(*pdu); pdu->hdr.pdo = pdu->hdr.hlen + hdgst; pdu->hdr.plen = @@ -542,8 +543,19 @@ static int nvmet_try_send_data(struct nvmet_tcp_cmd *cmd) cmd->state = NVMET_TCP_SEND_DDGST; cmd->offset = 0; } else { - nvmet_setup_response_pdu(cmd); + if (queue->nvme_sq.sqhd_disabled) { + cmd->queue->snd_cmd = NULL; + nvmet_tcp_put_cmd(cmd); + } else { + nvmet_setup_response_pdu(cmd); + } } + + if (queue->nvme_sq.sqhd_disabled) { + kfree(cmd->iov); + sgl_free(cmd->req.sg); + } + return 1; } @@ -619,7 +631,13 @@ static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd) return ret; cmd->offset += ret; - nvmet_setup_response_pdu(cmd); + + if (queue->nvme_sq.sqhd_disabled) { + cmd->queue->snd_cmd = NULL; + nvmet_tcp_put_cmd(cmd); + } else { + nvmet_setup_response_pdu(cmd); + } return 1; } -- cgit v1.2.1 From 7c349dde26b75db3fa1863e36984ac2271cd797a Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Fri, 8 Mar 2019 10:43:06 -0700 Subject: nvme-pci: use a flag for polled queues A negative value for the cq_vector used to mean the queue is either disabled or a polled queue. However, we have a queue enabled flag, so the cq_vector had been serving double duty. Don't overload the meaning of cq_vector. Use a flag specific to the polled queues instead. Signed-off-by: Keith Busch Reviewed-by: Sagi Grimberg Signed-off-by: Christoph Hellwig --- drivers/nvme/host/pci.c | 33 +++++++++++++-------------------- 1 file changed, 13 insertions(+), 20 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index a90cf5d63aac..4c0461bd6cfc 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -189,7 +189,7 @@ struct nvme_queue { dma_addr_t cq_dma_addr; u32 __iomem *q_db; u16 q_depth; - s16 cq_vector; + u16 cq_vector; u16 sq_tail; u16 last_sq_tail; u16 cq_head; @@ -200,6 +200,7 @@ struct nvme_queue { #define NVMEQ_ENABLED 0 #define NVMEQ_SQ_CMB 1 #define NVMEQ_DELETE_ERROR 2 +#define NVMEQ_POLLED 3 u32 *dbbuf_sq_db; u32 *dbbuf_cq_db; u32 *dbbuf_sq_ei; @@ -1088,7 +1089,7 @@ static int nvme_poll_irqdisable(struct nvme_queue *nvmeq, unsigned int tag) * using the CQ lock. For normal interrupt driven threads we have * to disable the interrupt to avoid racing with it. */ - if (nvmeq->cq_vector == -1) { + if (test_bit(NVMEQ_POLLED, &nvmeq->flags)) { spin_lock(&nvmeq->cq_poll_lock); found = nvme_process_cq(nvmeq, &start, &end, tag); spin_unlock(&nvmeq->cq_poll_lock); @@ -1148,7 +1149,7 @@ static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, struct nvme_command c; int flags = NVME_QUEUE_PHYS_CONTIG; - if (vector != -1) + if (!test_bit(NVMEQ_POLLED, &nvmeq->flags)) flags |= NVME_CQ_IRQ_ENABLED; /* @@ -1161,10 +1162,7 @@ static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, c.create_cq.cqid = cpu_to_le16(qid); c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); c.create_cq.cq_flags = cpu_to_le16(flags); - if (vector != -1) - c.create_cq.irq_vector = cpu_to_le16(vector); - else - c.create_cq.irq_vector = 0; + c.create_cq.irq_vector = cpu_to_le16(vector); return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); } @@ -1410,10 +1408,8 @@ static int nvme_suspend_queue(struct nvme_queue *nvmeq) nvmeq->dev->online_queues--; if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q) blk_mq_quiesce_queue(nvmeq->dev->ctrl.admin_q); - if (nvmeq->cq_vector == -1) - return 0; - pci_free_irq(to_pci_dev(nvmeq->dev->dev), nvmeq->cq_vector, nvmeq); - nvmeq->cq_vector = -1; + if (!test_and_clear_bit(NVMEQ_POLLED, &nvmeq->flags)) + pci_free_irq(to_pci_dev(nvmeq->dev->dev), nvmeq->cq_vector, nvmeq); return 0; } @@ -1507,7 +1503,6 @@ static int nvme_alloc_queue(struct nvme_dev *dev, int qid, int depth) nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; nvmeq->q_depth = depth; nvmeq->qid = qid; - nvmeq->cq_vector = -1; dev->ctrl.queue_count++; return 0; @@ -1552,7 +1547,7 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled) { struct nvme_dev *dev = nvmeq->dev; int result; - s16 vector; + u16 vector = 0; clear_bit(NVMEQ_DELETE_ERROR, &nvmeq->flags); @@ -1563,7 +1558,7 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled) if (!polled) vector = dev->num_vecs == 1 ? 0 : qid; else - vector = -1; + set_bit(NVMEQ_POLLED, &nvmeq->flags); result = adapter_alloc_cq(dev, qid, nvmeq, vector); if (result) @@ -1578,7 +1573,8 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled) nvmeq->cq_vector = vector; nvme_init_queue(nvmeq, qid); - if (vector != -1) { + if (!polled) { + nvmeq->cq_vector = vector; result = queue_request_irq(nvmeq); if (result < 0) goto release_sq; @@ -1588,7 +1584,6 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled) return result; release_sq: - nvmeq->cq_vector = -1; dev->online_queues--; adapter_delete_sq(dev, qid); release_cq: @@ -1730,7 +1725,7 @@ static int nvme_pci_configure_admin_queue(struct nvme_dev *dev) nvme_init_queue(nvmeq, 0); result = queue_request_irq(nvmeq); if (result) { - nvmeq->cq_vector = -1; + dev->online_queues--; return result; } @@ -2171,10 +2166,8 @@ static int nvme_setup_io_queues(struct nvme_dev *dev) * number of interrupts. */ result = queue_request_irq(adminq); - if (result) { - adminq->cq_vector = -1; + if (result) return result; - } set_bit(NVMEQ_ENABLED, &adminq->flags); result = nvme_create_io_queues(dev); -- cgit v1.2.1 From 88a041f4c1f6a21284c70b491929ed35336a0ea9 Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Fri, 8 Mar 2019 10:43:11 -0700 Subject: nvme-pci: remove q_dmadev from nvme_queue We don't need to save the dma device as it's not used in the hot path and hasn't in a long time. Shrink the struct nvme_queue removing this unnecessary member. Signed-off-by: Keith Busch Reviewed-by: Sagi Grimberg Signed-off-by: Christoph Hellwig --- drivers/nvme/host/pci.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 4c0461bd6cfc..8af2b10b4507 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -177,7 +177,6 @@ static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl) * commands and one for I/O commands). */ struct nvme_queue { - struct device *q_dmadev; struct nvme_dev *dev; spinlock_t sq_lock; struct nvme_command *sq_cmds; @@ -1369,16 +1368,16 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved) static void nvme_free_queue(struct nvme_queue *nvmeq) { - dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), + dma_free_coherent(nvmeq->dev->dev, CQ_SIZE(nvmeq->q_depth), (void *)nvmeq->cqes, nvmeq->cq_dma_addr); if (!nvmeq->sq_cmds) return; if (test_and_clear_bit(NVMEQ_SQ_CMB, &nvmeq->flags)) { - pci_free_p2pmem(to_pci_dev(nvmeq->q_dmadev), + pci_free_p2pmem(to_pci_dev(nvmeq->dev->dev), nvmeq->sq_cmds, SQ_SIZE(nvmeq->q_depth)); } else { - dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), + dma_free_coherent(nvmeq->dev->dev, SQ_SIZE(nvmeq->q_depth), nvmeq->sq_cmds, nvmeq->sq_dma_addr); } } @@ -1494,7 +1493,6 @@ static int nvme_alloc_queue(struct nvme_dev *dev, int qid, int depth) if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth)) goto free_cqdma; - nvmeq->q_dmadev = dev->dev; nvmeq->dev = dev; spin_lock_init(&nvmeq->sq_lock); spin_lock_init(&nvmeq->cq_poll_lock); -- cgit v1.2.1 From 39f8e36401142d73e33a954ac4bdf844fb5de9ae Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Fri, 8 Mar 2019 10:43:13 -0700 Subject: nvme-pci: remove unused nvme_iod member Signed-off-by: Keith Busch Reviewed-by: Sagi Grimberg Signed-off-by: Christoph Hellwig --- drivers/nvme/host/pci.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 8af2b10b4507..0cba927224b4 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -220,7 +220,6 @@ struct nvme_iod { int aborted; int npages; /* In the PRP list. 0 means small pool in use */ int nents; /* Used in scatterlist */ - int length; /* Of data, in bytes */ dma_addr_t first_dma; struct scatterlist meta_sg; /* metadata requires single contiguous buffer */ struct scatterlist *sg; @@ -603,7 +602,6 @@ static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev) iod->aborted = 0; iod->npages = -1; iod->nents = 0; - iod->length = size; return BLK_STS_OK; } -- cgit v1.2.1 From 9b048119a153590b934ef49aae309b723587f527 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 3 Mar 2019 08:04:01 -0700 Subject: nvme-pci: remove nvme_init_iod nvme_init_iod should really be split into two parts: initialize a few general iod fields, which can easily be done at the beginning of nvme_queue_rq, and allocating the scatterlist if needed, which logically belongs into nvme_map_data with the code making use of it. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/host/pci.c | 56 +++++++++++++++++++------------------------------ 1 file changed, 22 insertions(+), 34 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 0cba927224b4..2102a107e09b 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -208,10 +208,10 @@ struct nvme_queue { }; /* - * The nvme_iod describes the data in an I/O, including the list of PRP - * entries. You can't see it in this data structure because C doesn't let - * me express that. Use nvme_init_iod to ensure there's enough space - * allocated to store the PRP list. + * The nvme_iod describes the data in an I/O. + * + * The sg pointer contains the list of PRP/SGL chunk allocations in addition + * to the actual struct scatterlist. */ struct nvme_iod { struct nvme_request req; @@ -583,29 +583,6 @@ static inline bool nvme_pci_use_sgls(struct nvme_dev *dev, struct request *req) return true; } -static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev) -{ - struct nvme_iod *iod = blk_mq_rq_to_pdu(rq); - int nseg = blk_rq_nr_phys_segments(rq); - unsigned int size = blk_rq_payload_bytes(rq); - - iod->use_sgl = nvme_pci_use_sgls(dev, rq); - - if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) { - iod->sg = mempool_alloc(dev->iod_mempool, GFP_ATOMIC); - if (!iod->sg) - return BLK_STS_RESOURCE; - } else { - iod->sg = iod->inline_sg; - } - - iod->aborted = 0; - iod->npages = -1; - iod->nents = 0; - - return BLK_STS_OK; -} - static void nvme_free_iod(struct nvme_dev *dev, struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); @@ -837,6 +814,17 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, blk_status_t ret = BLK_STS_IOERR; int nr_mapped; + if (blk_rq_payload_bytes(req) > NVME_INT_BYTES(dev) || + blk_rq_nr_phys_segments(req) > NVME_INT_PAGES) { + iod->sg = mempool_alloc(dev->iod_mempool, GFP_ATOMIC); + if (!iod->sg) + return BLK_STS_RESOURCE; + } else { + iod->sg = iod->inline_sg; + } + + iod->use_sgl = nvme_pci_use_sgls(dev, req); + sg_init_table(iod->sg, blk_rq_nr_phys_segments(req)); iod->nents = blk_rq_map_sg(q, req, iod->sg); if (!iod->nents) @@ -881,6 +869,7 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, out_unmap: dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); out: + nvme_free_iod(dev, req); return ret; } @@ -913,9 +902,14 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx, struct nvme_queue *nvmeq = hctx->driver_data; struct nvme_dev *dev = nvmeq->dev; struct request *req = bd->rq; + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); struct nvme_command cmnd; blk_status_t ret; + iod->aborted = 0; + iod->npages = -1; + iod->nents = 0; + /* * We should not need to do this, but we're still using this to * ensure we can drain requests on a dying queue. @@ -927,21 +921,15 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx, if (ret) return ret; - ret = nvme_init_iod(req, dev); - if (ret) - goto out_free_cmd; - if (blk_rq_nr_phys_segments(req)) { ret = nvme_map_data(dev, req, &cmnd); if (ret) - goto out_cleanup_iod; + goto out_free_cmd; } blk_mq_start_request(req); nvme_submit_cmd(nvmeq, &cmnd, bd->last); return BLK_STS_OK; -out_cleanup_iod: - nvme_free_iod(dev, req); out_free_cmd: nvme_cleanup_cmd(req); return ret; -- cgit v1.2.1 From 915f04c93db4e3a7388c8ad8ddfc28830e4cbce3 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 3 Mar 2019 08:13:03 -0700 Subject: nvme-pci: move the call to nvme_cleanup_cmd out of nvme_unmap_data Cleaning up the command setup isn't related to unmapping data, and disentangling them will simplify error handling a bit down the road. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/host/pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 2102a107e09b..2af6cfbd77ec 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -888,7 +888,6 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir); } - nvme_cleanup_cmd(req); nvme_free_iod(dev, req); } @@ -939,6 +938,7 @@ static void nvme_pci_complete_rq(struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + nvme_cleanup_cmd(req); nvme_unmap_data(iod->nvmeq->dev, req); nvme_complete_rq(req); } -- cgit v1.2.1 From 7fe07d14f71fabef642a478626248a9121e95b7b Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 3 Mar 2019 08:15:19 -0700 Subject: nvme-pci: merge nvme_free_iod into nvme_unmap_data This means we now have a function that undoes everything nvme_map_data does and we can simplify the error handling a bit. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/host/pci.c | 44 +++++++++++++++++--------------------------- 1 file changed, 17 insertions(+), 27 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 2af6cfbd77ec..de199aff8d05 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -583,14 +583,24 @@ static inline bool nvme_pci_use_sgls(struct nvme_dev *dev, struct request *req) return true; } -static void nvme_free_iod(struct nvme_dev *dev, struct request *req) +static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + enum dma_data_direction dma_dir = rq_data_dir(req) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE; const int last_prp = dev->ctrl.page_size / sizeof(__le64) - 1; dma_addr_t dma_addr = iod->first_dma, next_dma_addr; - int i; + if (iod->nents) { + /* P2PDMA requests do not need to be unmapped */ + if (!is_pci_p2pdma_page(sg_page(iod->sg))) + dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); + + if (blk_integrity_rq(req)) + dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir); + } + if (iod->npages == 0) dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0], dma_addr); @@ -847,50 +857,30 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, ret = nvme_pci_setup_prps(dev, req, &cmnd->rw); if (ret != BLK_STS_OK) - goto out_unmap; + goto out; ret = BLK_STS_IOERR; if (blk_integrity_rq(req)) { if (blk_rq_count_integrity_sg(q, req->bio) != 1) - goto out_unmap; + goto out; sg_init_table(&iod->meta_sg, 1); if (blk_rq_map_integrity_sg(q, req->bio, &iod->meta_sg) != 1) - goto out_unmap; + goto out; if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir)) - goto out_unmap; + goto out; cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg)); } return BLK_STS_OK; -out_unmap: - dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); out: - nvme_free_iod(dev, req); + nvme_unmap_data(dev, req); return ret; } -static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) -{ - struct nvme_iod *iod = blk_mq_rq_to_pdu(req); - enum dma_data_direction dma_dir = rq_data_dir(req) ? - DMA_TO_DEVICE : DMA_FROM_DEVICE; - - if (iod->nents) { - /* P2PDMA requests do not need to be unmapped */ - if (!is_pci_p2pdma_page(sg_page(iod->sg))) - dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); - - if (blk_integrity_rq(req)) - dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir); - } - - nvme_free_iod(dev, req); -} - /* * NOTE: ns is NULL when called on the admin queue. */ -- cgit v1.2.1 From b15c592de37ed9d71499a3b8a750d1b235fcba3d Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 3 Mar 2019 08:52:21 -0700 Subject: nvme-pci: only call nvme_unmap_data for requests transferring data This mirrors how nvme_map_pci is called and will allow simplifying some checks in nvme_unmap_pci later on. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/host/pci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index de199aff8d05..030ee94452dd 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -929,7 +929,8 @@ static void nvme_pci_complete_rq(struct request *req) struct nvme_iod *iod = blk_mq_rq_to_pdu(req); nvme_cleanup_cmd(req); - nvme_unmap_data(iod->nvmeq->dev, req); + if (blk_rq_nr_phys_segments(req)) + nvme_unmap_data(iod->nvmeq->dev, req); nvme_complete_rq(req); } -- cgit v1.2.1 From 783b94bd9250478154904fa782d2cfc46336cdf6 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 3 Mar 2019 08:19:18 -0700 Subject: nvme-pci: do not build a scatterlist to map metadata We always have exactly one segment, so we can simply call dma_map_bvec. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/host/pci.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 030ee94452dd..0679ac7fed19 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -221,7 +221,7 @@ struct nvme_iod { int npages; /* In the PRP list. 0 means small pool in use */ int nents; /* Used in scatterlist */ dma_addr_t first_dma; - struct scatterlist meta_sg; /* metadata requires single contiguous buffer */ + dma_addr_t meta_dma; struct scatterlist *sg; struct scatterlist inline_sg[0]; }; @@ -592,13 +592,16 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) dma_addr_t dma_addr = iod->first_dma, next_dma_addr; int i; + if (blk_integrity_rq(req)) { + dma_unmap_page(dev->dev, iod->meta_dma, + rq_integrity_vec(req)->bv_len, dma_dir); + } + if (iod->nents) { /* P2PDMA requests do not need to be unmapped */ if (!is_pci_p2pdma_page(sg_page(iod->sg))) dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); - if (blk_integrity_rq(req)) - dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir); } if (iod->npages == 0) @@ -861,17 +864,11 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, ret = BLK_STS_IOERR; if (blk_integrity_rq(req)) { - if (blk_rq_count_integrity_sg(q, req->bio) != 1) - goto out; - - sg_init_table(&iod->meta_sg, 1); - if (blk_rq_map_integrity_sg(q, req->bio, &iod->meta_sg) != 1) - goto out; - - if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir)) + iod->meta_dma = dma_map_bvec(dev->dev, rq_integrity_vec(req), + dma_dir, 0); + if (dma_mapping_error(dev->dev, iod->meta_dma)) goto out; - - cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg)); + cmnd->rw.metadata = cpu_to_le64(iod->meta_dma); } return BLK_STS_OK; -- cgit v1.2.1 From 4aedb705437f6f98b45f45c394e6803ca67abd33 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 3 Mar 2019 09:46:28 -0700 Subject: nvme-pci: split metadata handling from nvme_map_data / nvme_unmap_data This prepares for some bigger changes to the data mapping helpers. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/host/pci.c | 48 +++++++++++++++++++++++++++--------------------- 1 file changed, 27 insertions(+), 21 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 0679ac7fed19..10e6b5d055e9 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -592,11 +592,6 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) dma_addr_t dma_addr = iod->first_dma, next_dma_addr; int i; - if (blk_integrity_rq(req)) { - dma_unmap_page(dev->dev, iod->meta_dma, - rq_integrity_vec(req)->bv_len, dma_dir); - } - if (iod->nents) { /* P2PDMA requests do not need to be unmapped */ if (!is_pci_p2pdma_page(sg_page(iod->sg))) @@ -858,24 +853,23 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, ret = nvme_pci_setup_sgls(dev, req, &cmnd->rw, nr_mapped); else ret = nvme_pci_setup_prps(dev, req, &cmnd->rw); - +out: if (ret != BLK_STS_OK) - goto out; - - ret = BLK_STS_IOERR; - if (blk_integrity_rq(req)) { - iod->meta_dma = dma_map_bvec(dev->dev, rq_integrity_vec(req), - dma_dir, 0); - if (dma_mapping_error(dev->dev, iod->meta_dma)) - goto out; - cmnd->rw.metadata = cpu_to_le64(iod->meta_dma); - } + nvme_unmap_data(dev, req); + return ret; +} - return BLK_STS_OK; +static blk_status_t nvme_map_metadata(struct nvme_dev *dev, struct request *req, + struct nvme_command *cmnd) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); -out: - nvme_unmap_data(dev, req); - return ret; + iod->meta_dma = dma_map_bvec(dev->dev, rq_integrity_vec(req), + rq_dma_dir(req), 0); + if (dma_mapping_error(dev->dev, iod->meta_dma)) + return BLK_STS_IOERR; + cmnd->rw.metadata = cpu_to_le64(iod->meta_dma); + return 0; } /* @@ -913,9 +907,17 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx, goto out_free_cmd; } + if (blk_integrity_rq(req)) { + ret = nvme_map_metadata(dev, req, &cmnd); + if (ret) + goto out_unmap_data; + } + blk_mq_start_request(req); nvme_submit_cmd(nvmeq, &cmnd, bd->last); return BLK_STS_OK; +out_unmap_data: + nvme_unmap_data(dev, req); out_free_cmd: nvme_cleanup_cmd(req); return ret; @@ -924,10 +926,14 @@ out_free_cmd: static void nvme_pci_complete_rq(struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + struct nvme_dev *dev = iod->nvmeq->dev; nvme_cleanup_cmd(req); + if (blk_integrity_rq(req)) + dma_unmap_page(dev->dev, iod->meta_dma, + rq_integrity_vec(req)->bv_len, rq_data_dir(req)); if (blk_rq_nr_phys_segments(req)) - nvme_unmap_data(iod->nvmeq->dev, req); + nvme_unmap_data(dev, req); nvme_complete_rq(req); } -- cgit v1.2.1 From d43f1ccfad053dbefba1d15443cdc36ca60958f0 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 5 Mar 2019 05:46:58 -0700 Subject: nvme-pci: remove the inline scatterlist optimization We'll have a better way to optimize for small I/O that doesn't require it soon, so remove the existing inline_sg case to make that optimization easier to implement. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/host/pci.c | 38 ++++++-------------------------------- 1 file changed, 6 insertions(+), 32 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 10e6b5d055e9..bd7e4209ab36 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -223,7 +223,6 @@ struct nvme_iod { dma_addr_t first_dma; dma_addr_t meta_dma; struct scatterlist *sg; - struct scatterlist inline_sg[0]; }; /* @@ -370,12 +369,6 @@ static bool nvme_dbbuf_update_and_check_event(u16 value, u32 *dbbuf_db, return true; } -/* - * Max size of iod being embedded in the request payload - */ -#define NVME_INT_PAGES 2 -#define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->ctrl.page_size) - /* * Will slightly overestimate the number of pages needed. This is OK * as it only leads to a small amount of wasted memory for the lifetime of @@ -410,15 +403,6 @@ static unsigned int nvme_pci_iod_alloc_size(struct nvme_dev *dev, return alloc_size + sizeof(struct scatterlist) * nseg; } -static unsigned int nvme_pci_cmd_size(struct nvme_dev *dev, bool use_sgl) -{ - unsigned int alloc_size = nvme_pci_iod_alloc_size(dev, - NVME_INT_BYTES(dev), NVME_INT_PAGES, - use_sgl); - - return sizeof(struct nvme_iod) + alloc_size; -} - static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, unsigned int hctx_idx) { @@ -621,8 +605,7 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) dma_addr = next_dma_addr; } - if (iod->sg != iod->inline_sg) - mempool_free(iod->sg, dev->iod_mempool); + mempool_free(iod->sg, dev->iod_mempool); } static void nvme_print_sgl(struct scatterlist *sgl, int nents) @@ -822,14 +805,9 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, blk_status_t ret = BLK_STS_IOERR; int nr_mapped; - if (blk_rq_payload_bytes(req) > NVME_INT_BYTES(dev) || - blk_rq_nr_phys_segments(req) > NVME_INT_PAGES) { - iod->sg = mempool_alloc(dev->iod_mempool, GFP_ATOMIC); - if (!iod->sg) - return BLK_STS_RESOURCE; - } else { - iod->sg = iod->inline_sg; - } + iod->sg = mempool_alloc(dev->iod_mempool, GFP_ATOMIC); + if (!iod->sg) + return BLK_STS_RESOURCE; iod->use_sgl = nvme_pci_use_sgls(dev, req); @@ -1612,7 +1590,7 @@ static int nvme_alloc_admin_tags(struct nvme_dev *dev) dev->admin_tagset.queue_depth = NVME_AQ_MQ_TAG_DEPTH; dev->admin_tagset.timeout = ADMIN_TIMEOUT; dev->admin_tagset.numa_node = dev_to_node(dev->dev); - dev->admin_tagset.cmd_size = nvme_pci_cmd_size(dev, false); + dev->admin_tagset.cmd_size = sizeof(struct nvme_iod); dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED; dev->admin_tagset.driver_data = dev; @@ -2257,11 +2235,7 @@ static int nvme_dev_add(struct nvme_dev *dev) dev->tagset.numa_node = dev_to_node(dev->dev); dev->tagset.queue_depth = min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1; - dev->tagset.cmd_size = nvme_pci_cmd_size(dev, false); - if ((dev->ctrl.sgls & ((1 << 0) | (1 << 1))) && sgl_threshold) { - dev->tagset.cmd_size = max(dev->tagset.cmd_size, - nvme_pci_cmd_size(dev, true)); - } + dev->tagset.cmd_size = sizeof(struct nvme_iod); dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE; dev->tagset.driver_data = dev; -- cgit v1.2.1 From dff824b2aadb7808f50ceb0927acaec5ad750ce7 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 5 Mar 2019 05:49:34 -0700 Subject: nvme-pci: optimize mapping of small single segment requests If a request is single segment and fits into one or two PRP entries we do not have to create a scatterlist for it, but can just map the bio_vec directly. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/host/pci.c | 45 ++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 40 insertions(+), 5 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index bd7e4209ab36..59731264b052 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -221,6 +221,7 @@ struct nvme_iod { int npages; /* In the PRP list. 0 means small pool in use */ int nents; /* Used in scatterlist */ dma_addr_t first_dma; + unsigned int dma_len; /* length of single DMA segment mapping */ dma_addr_t meta_dma; struct scatterlist *sg; }; @@ -576,13 +577,18 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) dma_addr_t dma_addr = iod->first_dma, next_dma_addr; int i; - if (iod->nents) { - /* P2PDMA requests do not need to be unmapped */ - if (!is_pci_p2pdma_page(sg_page(iod->sg))) - dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); - + if (iod->dma_len) { + dma_unmap_page(dev->dev, dma_addr, iod->dma_len, dma_dir); + return; } + WARN_ON_ONCE(!iod->nents); + + /* P2PDMA requests do not need to be unmapped */ + if (!is_pci_p2pdma_page(sg_page(iod->sg))) + dma_unmap_sg(dev->dev, iod->sg, iod->nents, rq_dma_dir(req)); + + if (iod->npages == 0) dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0], dma_addr); @@ -795,6 +801,24 @@ static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, return BLK_STS_OK; } +static blk_status_t nvme_setup_prp_simple(struct nvme_dev *dev, + struct request *req, struct nvme_rw_command *cmnd, + struct bio_vec *bv) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + unsigned int first_prp_len = dev->ctrl.page_size - bv->bv_offset; + + iod->first_dma = dma_map_bvec(dev->dev, bv, rq_dma_dir(req), 0); + if (dma_mapping_error(dev->dev, iod->first_dma)) + return BLK_STS_RESOURCE; + iod->dma_len = bv->bv_len; + + cmnd->dptr.prp1 = cpu_to_le64(iod->first_dma); + if (bv->bv_len > first_prp_len) + cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma + first_prp_len); + return 0; +} + static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, struct nvme_command *cmnd) { @@ -805,6 +829,17 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, blk_status_t ret = BLK_STS_IOERR; int nr_mapped; + if (blk_rq_nr_phys_segments(req) == 1) { + struct bio_vec bv = req_bvec(req); + + if (!is_pci_p2pdma_page(bv.bv_page)) { + if (bv.bv_offset + bv.bv_len <= dev->ctrl.page_size * 2) + return nvme_setup_prp_simple(dev, req, + &cmnd->rw, &bv); + } + } + + iod->dma_len = 0; iod->sg = mempool_alloc(dev->iod_mempool, GFP_ATOMIC); if (!iod->sg) return BLK_STS_RESOURCE; -- cgit v1.2.1 From 297910571f08f1d7e398793df6e606ebb375a3f1 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 5 Mar 2019 05:54:18 -0700 Subject: nvme-pci: optimize mapping single segment requests using SGLs If the controller supports SGLs we can take another short cut for single segment request, given that we can always map those without another indirection structure, and thus don't need to create a scatterlist structure. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/host/pci.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 59731264b052..82aa5cb21828 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -819,6 +819,23 @@ static blk_status_t nvme_setup_prp_simple(struct nvme_dev *dev, return 0; } +static blk_status_t nvme_setup_sgl_simple(struct nvme_dev *dev, + struct request *req, struct nvme_rw_command *cmnd, + struct bio_vec *bv) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + + iod->first_dma = dma_map_bvec(dev->dev, bv, rq_dma_dir(req), 0); + if (dma_mapping_error(dev->dev, iod->first_dma)) + return BLK_STS_RESOURCE; + iod->dma_len = bv->bv_len; + + cmnd->dptr.sgl.addr = cpu_to_le64(iod->first_dma); + cmnd->dptr.sgl.length = cpu_to_le32(iod->dma_len); + cmnd->dptr.sgl.type = NVME_SGL_FMT_DATA_DESC << 4; + return 0; +} + static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, struct nvme_command *cmnd) { @@ -836,6 +853,11 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, if (bv.bv_offset + bv.bv_len <= dev->ctrl.page_size * 2) return nvme_setup_prp_simple(dev, req, &cmnd->rw, &bv); + + if (iod->nvmeq->qid && + dev->ctrl.sgls & ((1 << 0) | (1 << 1))) + return nvme_setup_sgl_simple(dev, req, + &cmnd->rw, &bv); } } -- cgit v1.2.1 From 70479b71bc80ae6f63c8d6644cc76dff99f79686 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 5 Mar 2019 05:59:02 -0700 Subject: nvme-pci: tidy up nvme_map_data Remove two pointless local variables, remove ret assignment that is never used, move the use_sgl initialization closer to where it is used. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni --- drivers/nvme/host/pci.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 82aa5cb21828..c1eecde6b853 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -840,10 +840,7 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, struct nvme_command *cmnd) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); - struct request_queue *q = req->q; - enum dma_data_direction dma_dir = rq_data_dir(req) ? - DMA_TO_DEVICE : DMA_FROM_DEVICE; - blk_status_t ret = BLK_STS_IOERR; + blk_status_t ret = BLK_STS_RESOURCE; int nr_mapped; if (blk_rq_nr_phys_segments(req) == 1) { @@ -865,25 +862,21 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, iod->sg = mempool_alloc(dev->iod_mempool, GFP_ATOMIC); if (!iod->sg) return BLK_STS_RESOURCE; - - iod->use_sgl = nvme_pci_use_sgls(dev, req); - sg_init_table(iod->sg, blk_rq_nr_phys_segments(req)); - iod->nents = blk_rq_map_sg(q, req, iod->sg); + iod->nents = blk_rq_map_sg(req->q, req, iod->sg); if (!iod->nents) goto out; - ret = BLK_STS_RESOURCE; - if (is_pci_p2pdma_page(sg_page(iod->sg))) nr_mapped = pci_p2pdma_map_sg(dev->dev, iod->sg, iod->nents, - dma_dir); + rq_dma_dir(req)); else nr_mapped = dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, - dma_dir, DMA_ATTR_NO_WARN); + rq_dma_dir(req), DMA_ATTR_NO_WARN); if (!nr_mapped) goto out; + iod->use_sgl = nvme_pci_use_sgls(dev, req); if (iod->use_sgl) ret = nvme_pci_setup_sgls(dev, req, &cmnd->rw, nr_mapped); else -- cgit v1.2.1 From e84c2091a45228b62867ec0565898ef5404706a2 Mon Sep 17 00:00:00 2001 From: Max Gurtovoy Date: Tue, 2 Apr 2019 14:52:47 +0300 Subject: nvmet: never fail double namespace enablement In case we create N namespaces while N < NVMET_MAX_NAMESPACES, we can perform "echo 1 > /enable" as much as we want. In case N == NVMET_MAX_NAMESPACES we fail. Make sure we have the same flow for any N. Signed-off-by: Max Gurtovoy Reviewed-by: Johannes Thumshirn Signed-off-by: Christoph Hellwig --- drivers/nvme/target/core.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index b3e765a95af8..4dc388a2ecb0 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -494,13 +494,14 @@ int nvmet_ns_enable(struct nvmet_ns *ns) int ret; mutex_lock(&subsys->lock); - ret = -EMFILE; - if (subsys->nr_namespaces == NVMET_MAX_NAMESPACES) - goto out_unlock; ret = 0; if (ns->enabled) goto out_unlock; + ret = -EMFILE; + if (subsys->nr_namespaces == NVMET_MAX_NAMESPACES) + goto out_unlock; + ret = nvmet_bdev_ns_enable(ns); if (ret == -ENOTBLK) ret = nvmet_file_ns_enable(ns); -- cgit v1.2.1 From 013a63ef4edcd2366299225c3b081102171e8fa9 Mon Sep 17 00:00:00 2001 From: Max Gurtovoy Date: Tue, 2 Apr 2019 14:51:54 +0300 Subject: nvmet: add safety check for subsystem lock during nvmet_ns_changed we need to make sure that subsystem lock is taken during ctrl's list traversing. nvmet_ns_changed function is not static and can be used from various callers simultaneously. Signed-off-by: Max Gurtovoy Reviewed-by: Johannes Thumshirn Signed-off-by: Christoph Hellwig --- drivers/nvme/target/core.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers') diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index 4dc388a2ecb0..4d8dd29479c0 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -214,6 +214,8 @@ void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid) { struct nvmet_ctrl *ctrl; + lockdep_assert_held(&subsys->lock); + list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { nvmet_add_to_changed_ns_log(ctrl, cpu_to_le32(nsid)); if (nvmet_aen_bit_disabled(ctrl, NVME_AEN_BIT_NS_ATTR)) -- cgit v1.2.1 From d0de579c043c3a2ab60ce75eb6cf4d414becc676 Mon Sep 17 00:00:00 2001 From: Kenneth Heitke Date: Thu, 4 Apr 2019 12:57:45 -0600 Subject: nvme: log the error status on Identify Namespace failure Identify Namespace failures are logged as a warning but there is not an indication of the cause for the failure. Update the log message to include the error status. Signed-off-by: Kenneth Heitke Reviewed-by: Chaitanya Kulkarni Signed-off-by: Christoph Hellwig --- drivers/nvme/host/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index b5939112b9b6..ddb943395118 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1105,7 +1105,7 @@ static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl, error = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id)); if (error) { - dev_warn(ctrl->device, "Identify namespace failed\n"); + dev_warn(ctrl->device, "Identify namespace failed (%d)\n", error); kfree(id); return NULL; } -- cgit v1.2.1