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nvme-pci: use a flag for polled queues 

A negative value for the cq_vector used to mean the queue is either
disabled or a polled queue. However, we have a queue enabled flag,
so the cq_vector had been serving double duty.

Don't overload the meaning of cq_vector. Use a flag specific to the
polled queues instead.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Keith Busch 2019-03-08 10:43:06 -07:00 committed by Christoph Hellwig
parent 7058329538
commit 7c349dde26
1 changed files with 13 additions and 20 deletions
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33
drivers/nvme/host/pci.c
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@ -189,7 +189,7 @@ struct nvme_queue {
dma_addr_t cq_dma_addr;
u32 __iomem *q_db;
u16 q_depth;
s16 cq_vector;
u16 cq_vector;
u16 sq_tail;
u16 last_sq_tail;
u16 cq_head;
@ -200,6 +200,7 @@ struct nvme_queue {
#define NVMEQ_ENABLED 0
#define NVMEQ_SQ_CMB 1
#define NVMEQ_DELETE_ERROR 2
#define NVMEQ_POLLED 3
u32 *dbbuf_sq_db;
u32 *dbbuf_cq_db;
u32 *dbbuf_sq_ei;
@ -1088,7 +1089,7 @@ static int nvme_poll_irqdisable(struct nvme_queue *nvmeq, unsigned int tag)
* using the CQ lock. For normal interrupt driven threads we have
* to disable the interrupt to avoid racing with it.
*/
if (nvmeq->cq_vector == -1) {
if (test_bit(NVMEQ_POLLED, &nvmeq->flags)) {
spin_lock(&nvmeq->cq_poll_lock);
found = nvme_process_cq(nvmeq, &start, &end, tag);
spin_unlock(&nvmeq->cq_poll_lock);
@ -1148,7 +1149,7 @@ static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid,
struct nvme_command c;
int flags = NVME_QUEUE_PHYS_CONTIG;
if (vector != -1)
if (!test_bit(NVMEQ_POLLED, &nvmeq->flags))
flags |= NVME_CQ_IRQ_ENABLED;
/*
@ -1161,10 +1162,7 @@ static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid,
c.create_cq.cqid = cpu_to_le16(qid);
c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
c.create_cq.cq_flags = cpu_to_le16(flags);
if (vector != -1)
c.create_cq.irq_vector = cpu_to_le16(vector);
else
c.create_cq.irq_vector = 0;
c.create_cq.irq_vector = cpu_to_le16(vector);
return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
}
@ -1410,10 +1408,8 @@ static int nvme_suspend_queue(struct nvme_queue *nvmeq)
nvmeq->dev->online_queues--;
if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q)
blk_mq_quiesce_queue(nvmeq->dev->ctrl.admin_q);
if (nvmeq->cq_vector == -1)
return 0;
pci_free_irq(to_pci_dev(nvmeq->dev->dev), nvmeq->cq_vector, nvmeq);
nvmeq->cq_vector = -1;
if (!test_and_clear_bit(NVMEQ_POLLED, &nvmeq->flags))
pci_free_irq(to_pci_dev(nvmeq->dev->dev), nvmeq->cq_vector, nvmeq);
return 0;
}
@ -1507,7 +1503,6 @@ static int nvme_alloc_queue(struct nvme_dev *dev, int qid, int depth)
nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
nvmeq->q_depth = depth;
nvmeq->qid = qid;
nvmeq->cq_vector = -1;
dev->ctrl.queue_count++;
return 0;
@ -1552,7 +1547,7 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled)
{
struct nvme_dev *dev = nvmeq->dev;
int result;
s16 vector;
u16 vector = 0;
clear_bit(NVMEQ_DELETE_ERROR, &nvmeq->flags);
@ -1563,7 +1558,7 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled)
if (!polled)
vector = dev->num_vecs == 1 ? 0 : qid;
else
vector = -1;
set_bit(NVMEQ_POLLED, &nvmeq->flags);
result = adapter_alloc_cq(dev, qid, nvmeq, vector);
if (result)
@ -1578,7 +1573,8 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled)
nvmeq->cq_vector = vector;
nvme_init_queue(nvmeq, qid);
if (vector != -1) {
if (!polled) {
nvmeq->cq_vector = vector;
result = queue_request_irq(nvmeq);
if (result < 0)
goto release_sq;
@ -1588,7 +1584,6 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled)
return result;
release_sq:
nvmeq->cq_vector = -1;
dev->online_queues--;
adapter_delete_sq(dev, qid);
release_cq:
@ -1730,7 +1725,7 @@ static int nvme_pci_configure_admin_queue(struct nvme_dev *dev)
nvme_init_queue(nvmeq, 0);
result = queue_request_irq(nvmeq);
if (result) {
nvmeq->cq_vector = -1;
dev->online_queues--;
return result;
}
@ -2171,10 +2166,8 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
* number of interrupts.
*/
result = queue_request_irq(adminq);
if (result) {
adminq->cq_vector = -1;
if (result)
return result;
}
set_bit(NVMEQ_ENABLED, &adminq->flags);
result = nvme_create_io_queues(dev);