From 20469a37aed12a886d0deda5a07c04037923144a Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Wed, 17 Jan 2018 22:04:37 +0100 Subject: [PATCH 1/2] nvme-pci: check segement valid for SGL use The driver needs to verify there is a payload with a command before seeing if it should use SGLs to map it. Fixes: 955b1b5a00ba ("nvme-pci: move use_sgl initialization to nvme_init_iod()") Reported-by: Paul Menzel Reviewed-by: Paul Menzel Signed-off-by: Keith Busch Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- drivers/nvme/host/pci.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index d53550e612bc1..a7e94cc3c70eb 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -451,10 +451,13 @@ static void **nvme_pci_iod_list(struct request *req) static inline bool nvme_pci_use_sgls(struct nvme_dev *dev, struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + int nseg = blk_rq_nr_phys_segments(req); unsigned int avg_seg_size; - avg_seg_size = DIV_ROUND_UP(blk_rq_payload_bytes(req), - blk_rq_nr_phys_segments(req)); + if (nseg == 0) + return false; + + avg_seg_size = DIV_ROUND_UP(blk_rq_payload_bytes(req), nseg); if (!(dev->ctrl.sgls & ((1 << 0) | (1 << 1)))) return false; From b0f2853b56a2acaff19cca2c6a608f8ec268d21a Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 17 Jan 2018 22:04:38 +0100 Subject: [PATCH 2/2] nvme-pci: take sglist coalescing in dma_map_sg into account Some iommu implementations can merge physically and/or virtually contiguous segments inside sg_map_dma. The NVMe SGL support does not take this into account and will warn because of falling off a loop. Pass the number of mapped segments to nvme_pci_setup_sgls so that the SGL setup can take the number of mapped segments into account. Reported-by: Fangjian (Turing) Fixes: a7a7cbe3 ("nvme-pci: add SGL support") Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Signed-off-by: Jens Axboe --- drivers/nvme/host/pci.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index a7e94cc3c70eb..4276ebfff22ba 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -725,20 +725,19 @@ static void nvme_pci_sgl_set_seg(struct nvme_sgl_desc *sge, } static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, - struct request *req, struct nvme_rw_command *cmd) + struct request *req, struct nvme_rw_command *cmd, int entries) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); - int length = blk_rq_payload_bytes(req); struct dma_pool *pool; struct nvme_sgl_desc *sg_list; struct scatterlist *sg = iod->sg; - int entries = iod->nents, i = 0; dma_addr_t sgl_dma; + int i = 0; /* setting the transfer type as SGL */ cmd->flags = NVME_CMD_SGL_METABUF; - if (length == sg_dma_len(sg)) { + if (entries == 1) { nvme_pci_sgl_set_data(&cmd->dptr.sgl, sg); return BLK_STS_OK; } @@ -778,13 +777,9 @@ static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, } nvme_pci_sgl_set_data(&sg_list[i++], sg); - - length -= sg_dma_len(sg); sg = sg_next(sg); - entries--; - } while (length > 0); + } while (--entries > 0); - WARN_ON(entries > 0); return BLK_STS_OK; } @@ -796,6 +791,7 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, enum dma_data_direction dma_dir = rq_data_dir(req) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; blk_status_t ret = BLK_STS_IOERR; + int nr_mapped; sg_init_table(iod->sg, blk_rq_nr_phys_segments(req)); iod->nents = blk_rq_map_sg(q, req, iod->sg); @@ -803,12 +799,13 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, goto out; ret = BLK_STS_RESOURCE; - if (!dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, dma_dir, - DMA_ATTR_NO_WARN)) + nr_mapped = dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, dma_dir, + DMA_ATTR_NO_WARN); + if (!nr_mapped) goto out; if (iod->use_sgl) - ret = nvme_pci_setup_sgls(dev, req, &cmnd->rw); + ret = nvme_pci_setup_sgls(dev, req, &cmnd->rw, nr_mapped); else ret = nvme_pci_setup_prps(dev, req, &cmnd->rw);