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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>
This commit is contained in:
Keith Busch 2012-07-27 13:57:23 -04:00 committed by Matthew Wilcox
parent 8fc23e032d
commit a0cadb85b8
2 changed files with 7 additions and 4 deletions
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10
drivers/block/nvme.c
View File

@ -893,7 +893,8 @@ static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid,
int depth, int vector) int depth, int vector)
{ {
struct device *dmadev = &dev->pci_dev->dev; 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); struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq) + extra, GFP_KERNEL);
if (!nvmeq) if (!nvmeq)
return NULL; 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) 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(); nr_io_queues = num_online_cpus();
result = set_queue_count(dev, nr_io_queues); 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); 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++) { for (i = 0; i < nr_io_queues; i++) {
dev->queues[i + 1] = nvme_create_queue(dev, i + 1, dev->queues[i + 1] = nvme_create_queue(dev, i + 1, q_depth, i);
NVME_Q_DEPTH, i);
if (IS_ERR(dev->queues[i + 1])) if (IS_ERR(dev->queues[i + 1]))
return PTR_ERR(dev->queues[i + 1]); return PTR_ERR(dev->queues[i + 1]);
dev->queue_count++; dev->queue_count++;

1
include/linux/nvme.h
View File

@ -35,6 +35,7 @@ struct nvme_bar {
__u64 acq; /* Admin CQ Base Address */ __u64 acq; /* Admin CQ Base Address */
}; };
#define NVME_CAP_MQES(cap) ((cap) & 0xffff)
#define NVME_CAP_TIMEOUT(cap) (((cap) >> 24) & 0xff) #define NVME_CAP_TIMEOUT(cap) (((cap) >> 24) & 0xff)
#define NVME_CAP_STRIDE(cap) (((cap) >> 32) & 0xf) #define NVME_CAP_STRIDE(cap) (((cap) >> 32) & 0xf)
#define NVME_CAP_MPSMIN(cap) (((cap) >> 48) & 0xf) #define NVME_CAP_MPSMIN(cap) (((cap) >> 48) & 0xf)