diff options
| author | Keith Busch <keith.busch@intel.com> | 2012-07-27 13:57:23 -0400 |
|---|---|---|
| committer | Matthew Wilcox <matthew.r.wilcox@intel.com> | 2012-07-27 13:57:23 -0400 |
| commit | a0cadb85b8b758608ae0759151e29de7581c6731 (patch) | |
| tree | 3fc3c95f4cef33866a1da81daa86906bd5fa762c /drivers/block/nvme.c | |
| parent | 8fc23e032debd682f5ba9fc524a5846c10d2c522 (diff) | |
| download | linux-a0cadb85b8b758608ae0759151e29de7581c6731.tar.bz2 | |
NVMe: Do not set IO queue depth beyond device max
Set the depth for IO queues to the device's maximum supported queue
entries if the requested depth exceeds the device's capabilities.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Diffstat (limited to 'drivers/block/nvme.c')
| -rw-r--r-- | drivers/block/nvme.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/block/nvme.c b/drivers/block/nvme.c index 11951fa11a90..af1ef39bd6b4 100644 --- a/drivers/block/nvme.c +++ b/drivers/block/nvme.c @@ -893,7 +893,8 @@ static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, int depth, int vector) { struct device *dmadev = &dev->pci_dev->dev; - unsigned extra = (depth / 8) + (depth * sizeof(struct nvme_cmd_info)); + unsigned extra = DIV_ROUND_UP(depth, 8) + (depth * + sizeof(struct nvme_cmd_info)); struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq) + extra, GFP_KERNEL); if (!nvmeq) return NULL; @@ -1391,7 +1392,7 @@ static int set_queue_count(struct nvme_dev *dev, int count) static int __devinit nvme_setup_io_queues(struct nvme_dev *dev) { - int result, cpu, i, nr_io_queues, db_bar_size; + int result, cpu, i, nr_io_queues, db_bar_size, q_depth; nr_io_queues = num_online_cpus(); result = set_queue_count(dev, nr_io_queues); @@ -1437,9 +1438,10 @@ static int __devinit nvme_setup_io_queues(struct nvme_dev *dev) cpu = cpumask_next(cpu, cpu_online_mask); } + q_depth = min_t(int, NVME_CAP_MQES(readq(&dev->bar->cap)) + 1, + NVME_Q_DEPTH); for (i = 0; i < nr_io_queues; i++) { - dev->queues[i + 1] = nvme_create_queue(dev, i + 1, - NVME_Q_DEPTH, i); + dev->queues[i + 1] = nvme_create_queue(dev, i + 1, q_depth, i); if (IS_ERR(dev->queues[i + 1])) return PTR_ERR(dev->queues[i + 1]); dev->queue_count++; |