diff options
author | Xiang Chen <chenxiang66@hisilicon.com> | 2023-03-07 09:09:13 +0300 |
---|---|---|
committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-03-10 05:50:01 +0300 |
commit | 0e47effa77067d0e5fdd41871941d2b3d38a0e61 (patch) | |
tree | 2ddb7dc95291ab4b915872678727780d6f3da941 /drivers/scsi | |
parent | 538a60468966f47c53071d06db27bb78c2aaa81d (diff) | |
download | linux-0e47effa77067d0e5fdd41871941d2b3d38a0e61.tar.xz |
scsi: hisi_sas: Add poll support for v3 hw
Add a module parameter to set how many queues are used for iopoll. Also
fill the interface mq_poll. For internal I/Os from libsas and libata we use
non-iopoll queue (queue 0) to deliver and complete them. But for internal
abort I/Os, just don't send them for poll queues.
There is still a risk associated as this sends internal abort commands to
non-iopoll queues which actually requires sending an internal abort command
to every queue. As a result, make the module parameter as "experimental"
for now.
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Link: https://lore.kernel.org/r/1678169355-76215-3-git-send-email-chenxiang66@hisilicon.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r-- | drivers/scsi/hisi_sas/hisi_sas.h | 3 | ||||
-rw-r--r-- | drivers/scsi/hisi_sas/hisi_sas_main.c | 18 | ||||
-rw-r--r-- | drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 71 |
3 files changed, 82 insertions, 10 deletions
diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h index 6f8a52a1b808..a0eed81828dc 100644 --- a/drivers/scsi/hisi_sas/hisi_sas.h +++ b/drivers/scsi/hisi_sas/hisi_sas.h @@ -207,6 +207,7 @@ struct hisi_sas_cq { int rd_point; int id; int irq_no; + spinlock_t poll_lock; }; struct hisi_sas_dq { @@ -484,6 +485,8 @@ struct hisi_hba { struct dentry *debugfs_dump_dentry; struct dentry *debugfs_bist_dentry; struct dentry *debugfs_fifo_dentry; + + int iopoll_q_cnt; }; /* Generic HW DMA host memory structures */ diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index 8c038ccf1c09..628cfbe4053b 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -529,10 +529,21 @@ static int hisi_sas_queue_command(struct sas_task *task, gfp_t gfp_flags) dq_index = blk_mq_unique_tag_to_hwq(blk_tag); dq = &hisi_hba->dq[dq_index]; } else { - struct Scsi_Host *shost = hisi_hba->shost; - struct blk_mq_queue_map *qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT]; - int queue = qmap->mq_map[raw_smp_processor_id()]; + int queue; + + if (hisi_hba->iopoll_q_cnt) { + /* + * Use interrupt queue (queue 0) to deliver and complete + * internal IOs of libsas or libata when there is at least + * one iopoll queue + */ + queue = 0; + } else { + struct Scsi_Host *shost = hisi_hba->shost; + struct blk_mq_queue_map *qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT]; + queue = qmap->mq_map[raw_smp_processor_id()]; + } dq = &hisi_hba->dq[queue]; } break; @@ -2101,6 +2112,7 @@ int hisi_sas_alloc(struct hisi_hba *hisi_hba) /* Completion queue structure */ cq->id = i; cq->hisi_hba = hisi_hba; + spin_lock_init(&cq->poll_lock); /* Delivery queue structure */ spin_lock_init(&dq->lock); diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c index 835cb879f713..24282bcf33d2 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c @@ -552,6 +552,11 @@ static int prot_mask; module_param(prot_mask, int, 0444); MODULE_PARM_DESC(prot_mask, " host protection capabilities mask, def=0x0 "); +/* the index of iopoll queues are bigger than interrupt queues' */ +static int experimental_iopoll_q_cnt; +module_param(experimental_iopoll_q_cnt, int, 0444); +MODULE_PARM_DESC(experimental_iopoll_q_cnt, "number of queues to be used as poll mode, def=0"); + static void debugfs_work_handler_v3_hw(struct work_struct *work); static void debugfs_snapshot_regs_v3_hw(struct hisi_hba *hisi_hba); @@ -2391,18 +2396,20 @@ out: task->task_done(task); } -static void complete_v3_hw(struct hisi_sas_cq *cq) +static int complete_v3_hw(struct hisi_sas_cq *cq) { struct hisi_sas_complete_v3_hdr *complete_queue; struct hisi_hba *hisi_hba = cq->hisi_hba; u32 rd_point, wr_point; int queue = cq->id; + int completed; rd_point = cq->rd_point; complete_queue = hisi_hba->complete_hdr[queue]; wr_point = hisi_sas_read32(hisi_hba, COMPL_Q_0_WR_PTR + (0x14 * queue)); + completed = (wr_point + HISI_SAS_QUEUE_SLOTS - rd_point) % HISI_SAS_QUEUE_SLOTS; while (rd_point != wr_point) { struct hisi_sas_complete_v3_hdr *complete_hdr; @@ -2450,6 +2457,21 @@ static void complete_v3_hw(struct hisi_sas_cq *cq) /* update rd_point */ cq->rd_point = rd_point; hisi_sas_write32(hisi_hba, COMPL_Q_0_RD_PTR + (0x14 * queue), rd_point); + + return completed; +} + +static int queue_complete_v3_hw(struct Scsi_Host *shost, unsigned int queue) +{ + struct hisi_hba *hisi_hba = shost_priv(shost); + struct hisi_sas_cq *cq = &hisi_hba->cq[queue]; + int completed; + + spin_lock(&cq->poll_lock); + completed = complete_v3_hw(cq); + spin_unlock(&cq->poll_lock); + + return completed; } static irqreturn_t cq_thread_v3_hw(int irq_no, void *p) @@ -2481,8 +2503,9 @@ static void hisi_sas_v3_free_vectors(void *data) static int interrupt_preinit_v3_hw(struct hisi_hba *hisi_hba) { - int vectors; - int max_msi = HISI_SAS_MSI_COUNT_V3_HW, min_msi; + /* Allocate all MSI vectors to avoid re-insertion issue */ + int max_msi = HISI_SAS_MSI_COUNT_V3_HW; + int vectors, min_msi; struct Scsi_Host *shost = hisi_hba->shost; struct pci_dev *pdev = hisi_hba->pci_dev; struct irq_affinity desc = { @@ -2499,8 +2522,8 @@ static int interrupt_preinit_v3_hw(struct hisi_hba *hisi_hba) return -ENOENT; - hisi_hba->cq_nvecs = vectors - BASE_VECTORS_V3_HW; - shost->nr_hw_queues = hisi_hba->cq_nvecs; + hisi_hba->cq_nvecs = vectors - BASE_VECTORS_V3_HW - hisi_hba->iopoll_q_cnt; + shost->nr_hw_queues = hisi_hba->cq_nvecs + hisi_hba->iopoll_q_cnt; devm_add_action(&pdev->dev, hisi_sas_v3_free_vectors, pdev); return 0; @@ -3218,9 +3241,31 @@ static int debugfs_set_bist_v3_hw(struct hisi_hba *hisi_hba, bool enable) static void hisi_sas_map_queues(struct Scsi_Host *shost) { struct hisi_hba *hisi_hba = shost_priv(shost); - struct blk_mq_queue_map *qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT]; + struct blk_mq_queue_map *qmap; + int i, qoff; + + for (i = 0, qoff = 0; i < shost->nr_maps; i++) { + qmap = &shost->tag_set.map[i]; + if (i == HCTX_TYPE_DEFAULT) { + qmap->nr_queues = hisi_hba->cq_nvecs; + } else if (i == HCTX_TYPE_POLL) { + qmap->nr_queues = hisi_hba->iopoll_q_cnt; + } else { + qmap->nr_queues = 0; + continue; + } - blk_mq_pci_map_queues(qmap, hisi_hba->pci_dev, BASE_VECTORS_V3_HW); + /* At least one interrupt hardware queue */ + if (!qmap->nr_queues) + WARN_ON(i == HCTX_TYPE_DEFAULT); + qmap->queue_offset = qoff; + if (i == HCTX_TYPE_POLL) + blk_mq_map_queues(qmap); + else + blk_mq_pci_map_queues(qmap, hisi_hba->pci_dev, + BASE_VECTORS_V3_HW); + qoff += qmap->nr_queues; + } } static struct scsi_host_template sht_v3_hw = { @@ -3252,6 +3297,7 @@ static struct scsi_host_template sht_v3_hw = { .tag_alloc_policy = BLK_TAG_ALLOC_RR, .host_reset = hisi_sas_host_reset, .host_tagset = 1, + .mq_poll = queue_complete_v3_hw, }; static const struct hisi_sas_hw hisi_sas_v3_hw = { @@ -3311,6 +3357,13 @@ hisi_sas_shost_alloc_pci(struct pci_dev *pdev) if (hisi_sas_get_fw_info(hisi_hba) < 0) goto err_out; + if (experimental_iopoll_q_cnt < 0 || + experimental_iopoll_q_cnt >= hisi_hba->queue_count) + dev_err(dev, "iopoll queue count %d cannot exceed or equal 16, using default 0\n", + experimental_iopoll_q_cnt); + else + hisi_hba->iopoll_q_cnt = experimental_iopoll_q_cnt; + if (hisi_sas_alloc(hisi_hba)) { hisi_sas_free(hisi_hba); goto err_out; @@ -4866,6 +4919,10 @@ hisi_sas_v3_probe(struct pci_dev *pdev, const struct pci_device_id *id) shost->max_cmd_len = 16; shost->can_queue = HISI_SAS_UNRESERVED_IPTT; shost->cmd_per_lun = HISI_SAS_UNRESERVED_IPTT; + if (hisi_hba->iopoll_q_cnt) + shost->nr_maps = 3; + else + shost->nr_maps = 1; sha->sas_ha_name = DRV_NAME; sha->dev = dev; |