NVMe: Remove hctx reliance for multi-namespace
The driver needs to track shared tags to support multiple namespaces
that may be dynamically allocated or deleted. Relying on the first
request_queue's hctx's is not appropriate as we cannot clear outstanding
tags for all namespaces using this handle, nor can the driver easily track
all request_queue's hctx as namespaces are attached/detached. Instead,
this patch uses the nvme_dev's tagset to get the shared tag resources
instead of through a request_queue hctx.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 6ed1356..513908f 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -102,6 +102,7 @@
spinlock_t q_lock;
struct nvme_command *sq_cmds;
volatile struct nvme_completion *cqes;
+ struct blk_mq_tags **tags;
dma_addr_t sq_dma_addr;
dma_addr_t cq_dma_addr;
u32 __iomem *q_db;
@@ -114,7 +115,6 @@
u8 cq_phase;
u8 cqe_seen;
struct async_cmd_info cmdinfo;
- struct blk_mq_hw_ctx *hctx;
};
/*
@@ -182,9 +182,12 @@
struct nvme_dev *dev = data;
struct nvme_queue *nvmeq = dev->queues[0];
- WARN_ON(nvmeq->hctx);
- nvmeq->hctx = hctx;
+ WARN_ON(hctx_idx != 0);
+ WARN_ON(dev->admin_tagset.tags[0] != hctx->tags);
+ WARN_ON(nvmeq->tags);
+
hctx->driver_data = nvmeq;
+ nvmeq->tags = &dev->admin_tagset.tags[0];
return 0;
}
@@ -201,27 +204,16 @@
return 0;
}
-static void nvme_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx)
-{
- struct nvme_queue *nvmeq = hctx->driver_data;
-
- nvmeq->hctx = NULL;
-}
-
static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
unsigned int hctx_idx)
{
struct nvme_dev *dev = data;
- struct nvme_queue *nvmeq = dev->queues[
- (hctx_idx % dev->queue_count) + 1];
+ struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1];
- if (!nvmeq->hctx)
- nvmeq->hctx = hctx;
+ if (!nvmeq->tags)
+ nvmeq->tags = &dev->tagset.tags[hctx_idx];
- /* nvmeq queues are shared between namespaces. We assume here that
- * blk-mq map the tags so they match up with the nvme queue tags. */
- WARN_ON(nvmeq->hctx->tags != hctx->tags);
-
+ WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags);
hctx->driver_data = nvmeq;
return 0;
}
@@ -320,7 +312,7 @@
u16 status = le16_to_cpup(&cqe->status) >> 1;
u32 result = le32_to_cpup(&cqe->result);
- blk_mq_free_hctx_request(nvmeq->hctx, req);
+ blk_mq_free_request(req);
dev_warn(nvmeq->q_dmadev, "Abort status:%x result:%x", status, result);
++nvmeq->dev->abort_limit;
@@ -333,14 +325,13 @@
cmdinfo->result = le32_to_cpup(&cqe->result);
cmdinfo->status = le16_to_cpup(&cqe->status) >> 1;
queue_kthread_work(cmdinfo->worker, &cmdinfo->work);
- blk_mq_free_hctx_request(nvmeq->hctx, cmdinfo->req);
+ blk_mq_free_request(cmdinfo->req);
}
static inline struct nvme_cmd_info *get_cmd_from_tag(struct nvme_queue *nvmeq,
unsigned int tag)
{
- struct blk_mq_hw_ctx *hctx = nvmeq->hctx;
- struct request *req = blk_mq_tag_to_rq(hctx->tags, tag);
+ struct request *req = blk_mq_tag_to_rq(*nvmeq->tags, tag);
return blk_mq_rq_to_pdu(req);
}
@@ -1068,7 +1059,7 @@
c.common.opcode = nvme_admin_async_event;
c.common.command_id = req->tag;
- blk_mq_free_hctx_request(nvmeq->hctx, req);
+ blk_mq_free_request(req);
return __nvme_submit_cmd(nvmeq, &c);
}
@@ -1310,8 +1301,7 @@
}
}
-static void nvme_cancel_queue_ios(struct blk_mq_hw_ctx *hctx,
- struct request *req, void *data, bool reserved)
+static void nvme_cancel_queue_ios(struct request *req, void *data, bool reserved)
{
struct nvme_queue *nvmeq = data;
void *ctx;
@@ -1408,11 +1398,9 @@
static void nvme_clear_queue(struct nvme_queue *nvmeq)
{
- struct blk_mq_hw_ctx *hctx = nvmeq->hctx;
-
spin_lock_irq(&nvmeq->q_lock);
- if (hctx && hctx->tags)
- blk_mq_tag_busy_iter(hctx, nvme_cancel_queue_ios, nvmeq);
+ if (nvmeq->tags && *nvmeq->tags)
+ blk_mq_all_tag_busy_iter(*nvmeq->tags, nvme_cancel_queue_ios, nvmeq);
spin_unlock_irq(&nvmeq->q_lock);
}
@@ -1605,7 +1593,6 @@
.queue_rq = nvme_queue_rq,
.map_queue = blk_mq_map_queue,
.init_hctx = nvme_admin_init_hctx,
- .exit_hctx = nvme_exit_hctx,
.init_request = nvme_admin_init_request,
.timeout = nvme_timeout,
};
@@ -1614,7 +1601,6 @@
.queue_rq = nvme_queue_rq,
.map_queue = blk_mq_map_queue,
.init_hctx = nvme_init_hctx,
- .exit_hctx = nvme_exit_hctx,
.init_request = nvme_init_request,
.timeout = nvme_timeout,
};
@@ -2724,11 +2710,11 @@
for (i = 0; i < dev->online_queues; i++) {
nvmeq = dev->queues[i];
- if (!nvmeq->hctx)
+ if (!nvmeq->tags || !(*nvmeq->tags))
continue;
irq_set_affinity_hint(dev->entry[nvmeq->cq_vector].vector,
- nvmeq->hctx->cpumask);
+ blk_mq_tags_cpumask(*nvmeq->tags));
}
}