diff options
author | Hans de Goede <hdegoede@redhat.com> | 2014-10-12 12:19:40 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-03 15:34:00 -0800 |
commit | e28e2f2f7c42e5b9dd4c965a0245267e44a8a7ae (patch) | |
tree | d03d3f98fe2a92f51a5a9a55606a84306251b6e9 /drivers/usb/storage | |
parent | 1cc373c654acde47d78da9cccb5732dab2cc584f (diff) |
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: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Christoph 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/storage')
-rw-r--r-- | drivers/usb/storage/uas.c | 64 |
1 files changed, 23 insertions, 41 deletions
diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c index 89b24349269e..004ebc12bc21 100644 --- a/drivers/usb/storage/uas.c +++ b/drivers/usb/storage/uas.c @@ -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, \ |