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From: Jens Axboe <[email protected]>
To: Christoph Hellwig <[email protected]>
Cc: [email protected], [email protected],
	Hannes Reinecke <[email protected]>
Subject: Re: [PATCH 4/4] nvme: add support for mq_ops->queue_rqs()
Date: Thu, 16 Dec 2021 09:27:18 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On 12/16/21 9:15 AM, Christoph Hellwig wrote:
> On Thu, Dec 16, 2021 at 08:45:46AM -0700, Jens Axboe wrote:
>> On 12/16/21 2:08 AM, Christoph Hellwig wrote:
>>> On Wed, Dec 15, 2021 at 09:24:21AM -0700, Jens Axboe wrote:
>>>> +	spin_lock(&nvmeq->sq_lock);
>>>> +	while (!rq_list_empty(*rqlist)) {
>>>> +		struct request *req = rq_list_pop(rqlist);
>>>> +		struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
>>>> +
>>>> +		memcpy(nvmeq->sq_cmds + (nvmeq->sq_tail << nvmeq->sqes),
>>>> +				absolute_pointer(&iod->cmd), sizeof(iod->cmd));
>>>> +		if (++nvmeq->sq_tail == nvmeq->q_depth)
>>>> +			nvmeq->sq_tail = 0;
>>>
>>> So this doesn't even use the new helper added in patch 2?  I think this
>>> should call nvme_sq_copy_cmd().
>>
>> But you NAK'ed that one? It definitely should use that helper, so I take it
>> you are fine with it then if we do it here too? That would make 3 call sites,
>> and I still do think the helper makes sense...
> 
> I explained two times that the new helpers is fine as long as you open
> code nvme_submit_cmd in its two callers as it now is a trivial wrapper.

OK, I misunderstood which one you referred to then. So this incremental,
I'll send out a new series...


diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 58d97660374a..51a903d91d92 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -509,21 +509,6 @@ static inline void nvme_sq_copy_cmd(struct nvme_queue *nvmeq,
 		nvmeq->sq_tail = 0;
 }
 
-/**
- * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
- * @nvmeq: The queue to use
- * @cmd: The command to send
- * @write_sq: whether to write to the SQ doorbell
- */
-static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd,
-			    bool write_sq)
-{
-	spin_lock(&nvmeq->sq_lock);
-	nvme_sq_copy_cmd(nvmeq, cmd);
-	nvme_write_sq_db(nvmeq, write_sq);
-	spin_unlock(&nvmeq->sq_lock);
-}
-
 static void nvme_commit_rqs(struct blk_mq_hw_ctx *hctx)
 {
 	struct nvme_queue *nvmeq = hctx->driver_data;
@@ -977,7 +962,10 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
 	ret = nvme_prep_rq(dev, req);
 	if (unlikely(ret))
 		return ret;
-	nvme_submit_cmd(nvmeq, &iod->cmd, bd->last);
+	spin_lock(&nvmeq->sq_lock);
+	nvme_sq_copy_cmd(nvmeq, &iod->cmd);
+	nvme_write_sq_db(nvmeq, bd->last);
+	spin_unlock(&nvmeq->sq_lock);
 	return BLK_STS_OK;
 }
 
@@ -1213,7 +1201,11 @@ static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl)
 
 	c.common.opcode = nvme_admin_async_event;
 	c.common.command_id = NVME_AQ_BLK_MQ_DEPTH;
-	nvme_submit_cmd(nvmeq, &c, true);
+
+	spin_lock(&nvmeq->sq_lock);
+	nvme_sq_copy_cmd(nvmeq, &c);
+	nvme_write_sq_db(nvmeq, true);
+	spin_unlock(&nvmeq->sq_lock);
 }
 
 static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)

-- 
Jens Axboe


  reply	other threads:[~2021-12-16 16:27 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-15 16:24 [PATCHSET v3 0/4] Add support for list issue Jens Axboe
2021-12-15 16:24 ` [PATCH 1/4] block: add mq_ops->queue_rqs hook Jens Axboe
2021-12-16  9:01   ` Christoph Hellwig
2021-12-20 20:36   ` Keith Busch
2021-12-20 20:47     ` Jens Axboe
2021-12-15 16:24 ` [PATCH 2/4] nvme: split command copy into a helper Jens Axboe
2021-12-16  9:01   ` Christoph Hellwig
2021-12-16 12:17   ` Max Gurtovoy
2021-12-15 16:24 ` [PATCH 3/4] nvme: separate command prep and issue Jens Axboe
2021-12-16  9:02   ` Christoph Hellwig
2021-12-15 16:24 ` [PATCH 4/4] nvme: add support for mq_ops->queue_rqs() Jens Axboe
2021-12-15 17:29   ` Keith Busch
2021-12-15 20:27     ` Jens Axboe
2021-12-16  9:08   ` Christoph Hellwig
2021-12-16 13:06     ` Max Gurtovoy
2021-12-16 15:48       ` Jens Axboe
2021-12-16 16:00         ` Max Gurtovoy
2021-12-16 16:05           ` Jens Axboe
2021-12-16 16:19             ` Max Gurtovoy
2021-12-16 16:25               ` Jens Axboe
2021-12-16 16:34                 ` Max Gurtovoy
2021-12-16 16:36                   ` Jens Axboe
2021-12-16 16:57                     ` Max Gurtovoy
2021-12-16 17:16                       ` Jens Axboe
2021-12-19 12:14                         ` Max Gurtovoy
2021-12-19 14:48                           ` Jens Axboe
2021-12-20 10:11                             ` Max Gurtovoy
2021-12-20 14:19                               ` Jens Axboe
2021-12-20 14:25                                 ` Jens Axboe
2021-12-20 15:29                                 ` Max Gurtovoy
2021-12-20 16:34                                   ` Jens Axboe
2021-12-20 18:48                                     ` Max Gurtovoy
2021-12-20 18:58                                       ` Jens Axboe
2021-12-21 10:20                                         ` Max Gurtovoy
2021-12-21 15:23                                           ` Jens Axboe
2021-12-21 15:29                                             ` Max Gurtovoy
2021-12-21 15:33                                               ` Jens Axboe
2021-12-21 16:08                                                 ` Max Gurtovoy
2021-12-16 15:45     ` Jens Axboe
2021-12-16 16:15       ` Christoph Hellwig
2021-12-16 16:27         ` Jens Axboe [this message]
2021-12-16 16:30           ` Christoph Hellwig
2021-12-16 16:36             ` Jens Axboe
2021-12-16 13:02   ` Max Gurtovoy
2021-12-16 15:59     ` Jens Axboe
2021-12-16 16:06       ` Max Gurtovoy
2021-12-16 16:09         ` Jens Axboe
  -- strict thread matches above, loose matches on Subject: below --
2021-12-16 16:05 [PATCHSET v4 0/4] Add support for list issue Jens Axboe
2021-12-16 16:05 ` [PATCH 4/4] nvme: add support for mq_ops->queue_rqs() Jens Axboe
2021-12-16 16:38 [PATCHSET v5 0/4] Add support for list issue Jens Axboe
2021-12-16 16:39 ` [PATCH 4/4] nvme: add support for mq_ops->queue_rqs() Jens Axboe
2021-12-16 17:53   ` Christoph Hellwig

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