diff options
Diffstat (limited to 'drivers/nvme/host/pci.c')
| -rw-r--r-- | drivers/nvme/host/pci.c | 243 |
1 files changed, 195 insertions, 48 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 3f5a04c586cef..a11cfd4700892 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -13,7 +13,6 @@ */ #include <linux/aer.h> -#include <linux/bitops.h> #include <linux/blkdev.h> #include <linux/blk-mq.h> #include <linux/blk-mq-pci.h> @@ -26,12 +25,9 @@ #include <linux/mutex.h> #include <linux/once.h> #include <linux/pci.h> -#include <linux/poison.h> #include <linux/t10-pi.h> -#include <linux/timer.h> #include <linux/types.h> #include <linux/io-64-nonatomic-lo-hi.h> -#include <asm/unaligned.h> #include <linux/sed-opal.h> #include "nvme.h" @@ -39,11 +35,7 @@ #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) -/* - * We handle AEN commands ourselves and don't even let the - * block layer know about them. - */ -#define NVME_AQ_BLKMQ_DEPTH (NVME_AQ_DEPTH - NVME_NR_AERS) +#define SGES_PER_PAGE (PAGE_SIZE / sizeof(struct nvme_sgl_desc)) static int use_threaded_interrupts; module_param(use_threaded_interrupts, int, 0); @@ -57,6 +49,12 @@ module_param(max_host_mem_size_mb, uint, 0444); MODULE_PARM_DESC(max_host_mem_size_mb, "Maximum Host Memory Buffer (HMB) size per controller (in MiB)"); +static unsigned int sgl_threshold = SZ_32K; +module_param(sgl_threshold, uint, 0644); +MODULE_PARM_DESC(sgl_threshold, + "Use SGLs when average request segment size is larger or equal to " + "this size. Use 0 to disable SGLs."); + static int io_queue_depth_set(const char *val, const struct kernel_param *kp); static const struct kernel_param_ops io_queue_depth_ops = { .set = io_queue_depth_set, @@ -178,6 +176,7 @@ struct nvme_queue { struct nvme_iod { struct nvme_request req; struct nvme_queue *nvmeq; + bool use_sgl; int aborted; int npages; /* In the PRP list. 0 means small pool in use */ int nents; /* Used in scatterlist */ @@ -331,17 +330,35 @@ static int nvme_npages(unsigned size, struct nvme_dev *dev) return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); } -static unsigned int nvme_iod_alloc_size(struct nvme_dev *dev, - unsigned int size, unsigned int nseg) +/* + * Calculates the number of pages needed for the SGL segments. For example a 4k + * page can accommodate 256 SGL descriptors. + */ +static int nvme_pci_npages_sgl(unsigned int num_seg) { - return sizeof(__le64 *) * nvme_npages(size, dev) + - sizeof(struct scatterlist) * nseg; + return DIV_ROUND_UP(num_seg * sizeof(struct nvme_sgl_desc), PAGE_SIZE); } -static unsigned int nvme_cmd_size(struct nvme_dev *dev) +static unsigned int nvme_pci_iod_alloc_size(struct nvme_dev *dev, + unsigned int size, unsigned int nseg, bool use_sgl) { - return sizeof(struct nvme_iod) + - nvme_iod_alloc_size(dev, NVME_INT_BYTES(dev), NVME_INT_PAGES); + size_t alloc_size; + + if (use_sgl) + alloc_size = sizeof(__le64 *) * nvme_pci_npages_sgl(nseg); + else + alloc_size = sizeof(__le64 *) * nvme_npages(size, 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, @@ -425,10 +442,10 @@ static void __nvme_submit_cmd(struct nvme_queue *nvmeq, nvmeq->sq_tail = tail; } -static __le64 **iod_list(struct request *req) +static void **nvme_pci_iod_list(struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); - return (__le64 **)(iod->sg + blk_rq_nr_phys_segments(req)); + return (void **)(iod->sg + blk_rq_nr_phys_segments(req)); } static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev) @@ -438,7 +455,10 @@ static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev) unsigned int size = blk_rq_payload_bytes(rq); if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) { - iod->sg = kmalloc(nvme_iod_alloc_size(dev, size, nseg), GFP_ATOMIC); + size_t alloc_size = nvme_pci_iod_alloc_size(dev, size, nseg, + iod->use_sgl); + + iod->sg = kmalloc(alloc_size, GFP_ATOMIC); if (!iod->sg) return BLK_STS_RESOURCE; } else { @@ -456,18 +476,31 @@ static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev) static void nvme_free_iod(struct nvme_dev *dev, struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); - const int last_prp = dev->ctrl.page_size / 8 - 1; + const int last_prp = dev->ctrl.page_size / sizeof(__le64) - 1; + dma_addr_t dma_addr = iod->first_dma, next_dma_addr; + int i; - __le64 **list = iod_list(req); - dma_addr_t prp_dma = iod->first_dma; if (iod->npages == 0) - dma_pool_free(dev->prp_small_pool, list[0], prp_dma); + dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0], + dma_addr); + for (i = 0; i < iod->npages; i++) { - __le64 *prp_list = list[i]; - dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); - dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); - prp_dma = next_prp_dma; + void *addr = nvme_pci_iod_list(req)[i]; + + if (iod->use_sgl) { + struct nvme_sgl_desc *sg_list = addr; + + next_dma_addr = + le64_to_cpu((sg_list[SGES_PER_PAGE - 1]).addr); + } else { + __le64 *prp_list = addr; + + next_dma_addr = le64_to_cpu(prp_list[last_prp]); + } + + dma_pool_free(dev->prp_page_pool, addr, dma_addr); + dma_addr = next_dma_addr; } if (iod->sg != iod->inline_sg) @@ -555,7 +588,8 @@ static void nvme_print_sgl(struct scatterlist *sgl, int nents) } } -static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req) +static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev, + struct request *req, struct nvme_rw_command *cmnd) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); struct dma_pool *pool; @@ -566,14 +600,16 @@ static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req) u32 page_size = dev->ctrl.page_size; int offset = dma_addr & (page_size - 1); __le64 *prp_list; - __le64 **list = iod_list(req); + void **list = nvme_pci_iod_list(req); dma_addr_t prp_dma; int nprps, i; + iod->use_sgl = false; + length -= (page_size - offset); if (length <= 0) { iod->first_dma = 0; - return BLK_STS_OK; + goto done; } dma_len -= (page_size - offset); @@ -587,7 +623,7 @@ static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req) if (length <= page_size) { iod->first_dma = dma_addr; - return BLK_STS_OK; + goto done; } nprps = DIV_ROUND_UP(length, page_size); @@ -634,6 +670,10 @@ static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req) dma_len = sg_dma_len(sg); } +done: + cmnd->dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); + cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma); + return BLK_STS_OK; bad_sgl: @@ -643,6 +683,110 @@ static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req) return BLK_STS_IOERR; } +static void nvme_pci_sgl_set_data(struct nvme_sgl_desc *sge, + struct scatterlist *sg) +{ + sge->addr = cpu_to_le64(sg_dma_address(sg)); + sge->length = cpu_to_le32(sg_dma_len(sg)); + sge->type = NVME_SGL_FMT_DATA_DESC << 4; +} + +static void nvme_pci_sgl_set_seg(struct nvme_sgl_desc *sge, + dma_addr_t dma_addr, int entries) +{ + sge->addr = cpu_to_le64(dma_addr); + if (entries < SGES_PER_PAGE) { + sge->length = cpu_to_le32(entries * sizeof(*sge)); + sge->type = NVME_SGL_FMT_LAST_SEG_DESC << 4; + } else { + sge->length = cpu_to_le32(PAGE_SIZE); + sge->type = NVME_SGL_FMT_SEG_DESC << 4; + } +} + +static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, + struct request *req, struct nvme_rw_command *cmd) +{ + 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; + + iod->use_sgl = true; + + /* setting the transfer type as SGL */ + cmd->flags = NVME_CMD_SGL_METABUF; + + if (length == sg_dma_len(sg)) { + nvme_pci_sgl_set_data(&cmd->dptr.sgl, sg); + return BLK_STS_OK; + } + + if (entries <= (256 / sizeof(struct nvme_sgl_desc))) { + pool = dev->prp_small_pool; + iod->npages = 0; + } else { + pool = dev->prp_page_pool; + iod->npages = 1; + } + + sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma); + if (!sg_list) { + iod->npages = -1; + return BLK_STS_RESOURCE; + } + + nvme_pci_iod_list(req)[0] = sg_list; + iod->first_dma = sgl_dma; + + nvme_pci_sgl_set_seg(&cmd->dptr.sgl, sgl_dma, entries); + + do { + if (i == SGES_PER_PAGE) { + struct nvme_sgl_desc *old_sg_desc = sg_list; + struct nvme_sgl_desc *link = &old_sg_desc[i - 1]; + + sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma); + if (!sg_list) + return BLK_STS_RESOURCE; + + i = 0; + nvme_pci_iod_list(req)[iod->npages++] = sg_list; + sg_list[i++] = *link; + nvme_pci_sgl_set_seg(link, sgl_dma, entries); + } + + nvme_pci_sgl_set_data(&sg_list[i++], sg); + + length -= sg_dma_len(sg); + sg = sg_next(sg); + entries--; + } while (length > 0); + + WARN_ON(entries > 0); + return BLK_STS_OK; +} + +static inline bool nvme_pci_use_sgls(struct nvme_dev *dev, struct request *req) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + unsigned int avg_seg_size; + + avg_seg_size = DIV_ROUND_UP(blk_rq_payload_bytes(req), + blk_rq_nr_phys_segments(req)); + + if (!(dev->ctrl.sgls & ((1 << 0) | (1 << 1)))) + return false; + if (!iod->nvmeq->qid) + return false; + if (!sgl_threshold || avg_seg_size < sgl_threshold) + return false; + return true; +} + static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, struct nvme_command *cmnd) { @@ -662,7 +806,11 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, DMA_ATTR_NO_WARN)) goto out; - ret = nvme_setup_prps(dev, req); + if (nvme_pci_use_sgls(dev, req)) + ret = nvme_pci_setup_sgls(dev, req, &cmnd->rw); + else + ret = nvme_pci_setup_prps(dev, req, &cmnd->rw); + if (ret != BLK_STS_OK) goto out_unmap; @@ -682,8 +830,6 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, goto out_unmap; } - cmnd->rw.dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); - cmnd->rw.dptr.prp2 = cpu_to_le64(iod->first_dma); if (blk_integrity_rq(req)) cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg)); return BLK_STS_OK; @@ -804,7 +950,7 @@ static inline void nvme_handle_cqe(struct nvme_queue *nvmeq, * for them but rather special case them here. */ if (unlikely(nvmeq->qid == 0 && - cqe->command_id >= NVME_AQ_BLKMQ_DEPTH)) { + cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { nvme_complete_async_event(&nvmeq->dev->ctrl, cqe->status, &cqe->result); return; @@ -897,7 +1043,7 @@ static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) return __nvme_poll(nvmeq, tag); } -static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl, int aer_idx) +static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl) { struct nvme_dev *dev = to_nvme_dev(ctrl); struct nvme_queue *nvmeq = dev->queues[0]; @@ -905,7 +1051,7 @@ static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl, int aer_idx) memset(&c, 0, sizeof(c)); c.common.opcode = nvme_admin_async_event; - c.common.command_id = NVME_AQ_BLKMQ_DEPTH + aer_idx; + c.common.command_id = NVME_AQ_BLK_MQ_DEPTH; spin_lock_irq(&nvmeq->q_lock); __nvme_submit_cmd(nvmeq, &c); @@ -930,7 +1076,7 @@ static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; /* - * Note: we (ab)use the fact the the prp fields survive if no data + * Note: we (ab)use the fact that the prp fields survive if no data * is attached to the request. */ memset(&c, 0, sizeof(c)); @@ -951,7 +1097,7 @@ static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, int flags = NVME_QUEUE_PHYS_CONTIG; /* - * Note: we (ab)use the fact the the prp fields survive if no data + * Note: we (ab)use the fact that the prp fields survive if no data * is attached to the request. */ memset(&c, 0, sizeof(c)); @@ -1372,14 +1518,10 @@ static int nvme_alloc_admin_tags(struct nvme_dev *dev) dev->admin_tagset.ops = &nvme_mq_admin_ops; dev->admin_tagset.nr_hw_queues = 1; - /* - * Subtract one to leave an empty queue entry for 'Full Queue' - * condition. See NVM-Express 1.2 specification, section 4.1.2. - */ - dev->admin_tagset.queue_depth = NVME_AQ_BLKMQ_DEPTH - 1; + 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_cmd_size(dev); + dev->admin_tagset.cmd_size = nvme_pci_cmd_size(dev, false); dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED; dev->admin_tagset.driver_data = dev; @@ -1906,7 +2048,11 @@ 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_cmd_size(dev); + 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.flags = BLK_MQ_F_SHOULD_MERGE; dev->tagset.driver_data = dev; @@ -2132,9 +2278,9 @@ static void nvme_remove_dead_ctrl(struct nvme_dev *dev, int status) { dev_warn(dev->ctrl.device, "Removing after probe failure status: %d\n", status); - kref_get(&dev->ctrl.kref); + nvme_get_ctrl(&dev->ctrl); nvme_dev_disable(dev, false); - if (!schedule_work(&dev->remove_work)) + if (!queue_work(nvme_wq, &dev->remove_work)) nvme_put_ctrl(&dev->ctrl); } @@ -2557,6 +2703,7 @@ static int __init nvme_init(void) static void __exit nvme_exit(void) { pci_unregister_driver(&nvme_driver); + flush_workqueue(nvme_wq); _nvme_check_size(); } |