Commit e28e2f2f authored by Hans de Goede's avatar Hans de Goede Committed by Greg Kroah-Hartman
Browse files

uas: Make uas work with blk-mq 



With uas over usb-3 the tags inside the uas iu-s must match the usb-3 stream
ids, and those go from 1 - qdepth.

Before blk-mq calling scsi_activate_tcq(sdev, qdepth) guaranteed that we would
only get cmnd->request->tag from 0 - (qdepth - 1), and we used those as
uas-tags / stream-ids.

With blk-mq however we are guaranteed to never get more then qdepth commands
queued at the same time, but the cmnd->request->tag values may be much larger,
which breaks uas.

This commit fixes this by generating uas tags in the 1 - qdepth range ourselves
instead of using cmnd->request->tag.

While touching all involved code anyways also rename the uas_cmd_info stream
field to uas_tag, because when using uas over usb-2 streams are not used.

Cc: Christoph Hellwig <hch@infradead.org>
Reported-by: default avatarDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>

--
Changes in v2:
-Remove ".disable_blk_mq = true" from uas_host_template
Changes in v3:
-Rebased on top of Linus' current master branch
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1cc373c6

drivers/usb/storage/uas.c

+23 −41
Original line number Diff line number Diff line
@@ -66,7 +66,7 @@ enum { 
/* Overrides scsi_pointer */

struct uas_cmd_info {

	unsigned int state;

	unsigned int stream;

	unsigned int uas_tag;

	struct urb *cmd_urb;

	struct urb *data_in_urb;

	struct urb *data_out_urb;
@@ -173,30 +173,15 @@ static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd) 
	cmnd->result = sense_iu->status;

}



/*

 * scsi-tags go from 0 - (nr_tags - 1), uas tags need to match stream-ids,

 * which go from 1 - nr_streams. And we use 1 for untagged commands.

 */

static int uas_get_tag(struct scsi_cmnd *cmnd)

{

	int tag;



	if (blk_rq_tagged(cmnd->request))

		tag = cmnd->request->tag + 2;

	else

		tag = 1;



	return tag;

}



static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,

			      int status)

{

	struct uas_cmd_info *ci = (void *)&cmnd->SCp;

	struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;



	scmd_printk(KERN_INFO, cmnd,

		    "%s %d tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",

		    prefix, status, uas_get_tag(cmnd),

		    "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",

		    prefix, status, cmdinfo->uas_tag,

		    (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",

		    (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",

		    (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
@@ -242,7 +227,7 @@ static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller) 
			      DATA_OUT_URB_INFLIGHT |

			      COMMAND_ABORTED))

		return -EBUSY;

	devinfo->cmnd[uas_get_tag(cmnd) - 1] = NULL;

	devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;

	uas_free_unsubmitted_urbs(cmnd);

	cmnd->scsi_done(cmnd);

	return 0;
@@ -289,7 +274,7 @@ static void uas_stat_cmplt(struct urb *urb) 
	idx = be16_to_cpup(&iu->tag) - 1;

	if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {

		dev_err(&urb->dev->dev,

			"stat urb: no pending cmd for tag %d\n", idx + 1);

			"stat urb: no pending cmd for uas-tag %d\n", idx + 1);

		goto out;

	}
@@ -427,7 +412,8 @@ static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp, 
		goto out;

	usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,

			  uas_data_cmplt, cmnd);

	urb->stream_id = cmdinfo->stream;

	if (devinfo->use_streams)

		urb->stream_id = cmdinfo->uas_tag;

	urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;

	urb->sg = sdb->table.sgl;

 out:
@@ -451,7 +437,8 @@ static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp, 


	usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),

			  uas_stat_cmplt, cmnd->device->host);

	urb->stream_id = cmdinfo->stream;

	if (devinfo->use_streams)

		urb->stream_id = cmdinfo->uas_tag;

	urb->transfer_flags |= URB_FREE_BUFFER;

 out:

	return urb;
@@ -465,6 +452,7 @@ static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp, 
{

	struct usb_device *udev = devinfo->udev;

	struct scsi_device *sdev = cmnd->device;

	struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;

	struct urb *urb = usb_alloc_urb(0, gfp);

	struct command_iu *iu;

	int len;
@@ -481,7 +469,7 @@ static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp, 
		goto free;



	iu->iu_id = IU_ID_COMMAND;

	iu->tag = cpu_to_be16(uas_get_tag(cmnd));

	iu->tag = cpu_to_be16(cmdinfo->uas_tag);

	iu->prio_attr = UAS_SIMPLE_TAG;

	iu->len = len;

	int_to_scsilun(sdev->lun, &iu->lun);
@@ -608,8 +596,7 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd, 
	struct uas_dev_info *devinfo = sdev->hostdata;

	struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;

	unsigned long flags;

	unsigned int stream;

	int err;

	int idx, err;



	BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
@@ -635,8 +622,12 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd, 
		return 0;

	}



	stream = uas_get_tag(cmnd);

	if (devinfo->cmnd[stream - 1]) {

	/* Find a free uas-tag */

	for (idx = 0; idx < devinfo->qdepth; idx++) {

		if (!devinfo->cmnd[idx])

			break;

	}

	if (idx == devinfo->qdepth) {

		spin_unlock_irqrestore(&devinfo->lock, flags);

		return SCSI_MLQUEUE_DEVICE_BUSY;

	}
@@ -644,7 +635,7 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd, 
	cmnd->scsi_done = done;



	memset(cmdinfo, 0, sizeof(*cmdinfo));

	cmdinfo->stream = stream;

	cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */

	cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;



	switch (cmnd->sc_data_direction) {
@@ -659,10 +650,8 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd, 
		break;

	}



	if (!devinfo->use_streams) {

	if (!devinfo->use_streams)

		cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);

		cmdinfo->stream = 0;

	}



	err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);

	if (err) {
@@ -674,7 +663,7 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd, 
		uas_add_work(cmdinfo);

	}



	devinfo->cmnd[stream - 1] = cmnd;

	devinfo->cmnd[idx] = cmnd;

	spin_unlock_irqrestore(&devinfo->lock, flags);

	return 0;

}
@@ -702,7 +691,7 @@ static int uas_eh_abort_handler(struct scsi_cmnd *cmnd) 
	cmdinfo->state |= COMMAND_ABORTED;



	/* Drop all refs to this cmnd, kill data urbs to break their ref */

	devinfo->cmnd[uas_get_tag(cmnd) - 1] = NULL;

	devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;

	if (cmdinfo->state & DATA_IN_URB_INFLIGHT)

		data_in_urb = usb_get_urb(cmdinfo->data_in_urb);

	if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
@@ -818,13 +807,6 @@ static struct scsi_host_template uas_host_template = { 
	.cmd_per_lun = 1,	/* until we override it */

	.skip_settle_delay = 1,

	.ordered_tag = 1,



	/*

	 * The uas drivers expects tags not to be bigger than the maximum

	 * per-device queue depth, which is not true with the blk-mq tag

	 * allocator.

	 */

	.disable_blk_mq = true,

};



#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \

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