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nvme: refactor set_queue_count 

Split out a helper that just issues the Set Features and interprets the
result which can go to common code, and document why we are ignoring
non-timeout error returns in the PCIe driver.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2015-11-26 11:09:06 +01:00 committed by Jens Axboe
parent f3ca80fc11
commit 9a0be7abb6
3 changed files with 30 additions and 21 deletions
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16
drivers/nvme/host/core.c
View File

@ -327,6 +327,22 @@ int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log)
return error;
}
int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
{
u32 q_count = (*count - 1) | ((*count - 1) << 16);
u32 result;
int status, nr_io_queues;
status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, 0,
&result);
if (status)
return status;
nr_io_queues = min(result & 0xffff, result >> 16) + 1;
*count = min(*count, nr_io_queues);
return 0;
}
static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
{
struct nvme_user_io io;

1
drivers/nvme/host/nvme.h
View File

@ -232,6 +232,7 @@ int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
dma_addr_t dma_addr, u32 *result);
int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
dma_addr_t dma_addr, u32 *result);
int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
extern spinlock_t dev_list_lock;

34
drivers/nvme/host/pci.c
View File

@ -1559,23 +1559,6 @@ static void nvme_create_io_queues(struct nvme_dev *dev)
}
}
static int set_queue_count(struct nvme_dev *dev, int count)
{
int status;
u32 result;
u32 q_count = (count - 1) | ((count - 1) << 16);
status = nvme_set_features(&dev->ctrl, NVME_FEAT_NUM_QUEUES, q_count, 0,
&result);
if (status < 0)
return status;
if (status > 0) {
dev_err(dev->dev, "Could not set queue count (%d)\n", status);
return 0;
}
return min(result & 0xffff, result >> 16) + 1;
}
static void __iomem *nvme_map_cmb(struct nvme_dev *dev)
{
u64 szu, size, offset;
@ -1640,11 +1623,20 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
int result, i, vecs, nr_io_queues, size;
nr_io_queues = num_possible_cpus();
result = set_queue_count(dev, nr_io_queues);
if (result <= 0)
result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues);
if (result < 0)
return result;
if (result < nr_io_queues)
nr_io_queues = result;
/*
* Degraded controllers might return an error when setting the queue
* count. We still want to be able to bring them online and offer
* access to the admin queue, as that might be only way to fix them up.
*/
if (result > 0) {
dev_err(dev->dev, "Could not set queue count (%d)\n", result);
nr_io_queues = 0;
result = 0;
}
if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) {
result = nvme_cmb_qdepth(dev, nr_io_queues,