From mboxrd@z Thu Jan 1 00:00:00 1970 From: zhangweiping@didichuxing.com (weiping zhang) Date: Fri, 7 Jul 2017 17:05:47 +0800 Subject: [PATCH] nvme-pci: add module parameter for io queue depth Message-ID: <20170707090547.GA2420@localhost.didichuxing.com> Adjust io queue depth more easily. Signed-off-by: weiping zhang --- 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 951042a..f1ac0f8 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -48,7 +48,6 @@ #include "nvme.h" -#define NVME_Q_DEPTH 1024 #define NVME_AQ_DEPTH 256 #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) @@ -66,6 +65,10 @@ static bool use_cmb_sqes = true; module_param(use_cmb_sqes, bool, 0644); MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes"); +static int io_queue_depth = 1024; +module_param(io_queue_depth, int, 0644); +MODULE_PARM_DESC(io_queue_depth, "set io queue depth"); + static struct workqueue_struct *nvme_workq; struct nvme_dev; @@ -1730,7 +1733,7 @@ static int nvme_pci_enable(struct nvme_dev *dev) cap = lo_hi_readq(dev->bar + NVME_REG_CAP); - dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH); + dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, io_queue_depth); dev->db_stride = 1 << NVME_CAP_STRIDE(cap); dev->dbs = dev->bar + 4096; -- 2.9.4