* USB Attached SCSI
* Note that this is not the same as the USB Mass Storage driver
*
- * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013
+ * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2014
* Copyright Matthew Wilcox for Intel Corp, 2010
* Copyright Sarah Sharp for Intel Corp, 2010
*
struct usb_anchor data_urbs;
unsigned long flags;
int qdepth, resetting;
- struct response_iu response;
unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
unsigned use_streams:1;
unsigned uas_sense_old:1;
- unsigned running_task:1;
unsigned shutdown:1;
struct scsi_cmnd *cmnd;
spinlock_t lock;
DATA_OUT_URB_INFLIGHT);
uas_try_complete(cmnd, __func__);
}
- devinfo->running_task = 0;
spin_unlock_irqrestore(&devinfo->lock, flags);
}
cmnd = scsi_host_find_tag(shost, tag - 1);
if (!cmnd) {
- if (iu->iu_id == IU_ID_RESPONSE) {
- if (!devinfo->running_task)
- dev_warn(&urb->dev->dev,
- "stat urb: recv unexpected response iu\n");
- /* store results for uas_eh_task_mgmt() */
- memcpy(&devinfo->response, iu, sizeof(devinfo->response));
- }
usb_free_urb(urb);
spin_unlock_irqrestore(&devinfo->lock, flags);
return;
return NULL;
}
-static int uas_submit_task_urb(struct scsi_cmnd *cmnd, gfp_t gfp,
- u8 function, u16 stream_id)
-{
- struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
- struct usb_device *udev = devinfo->udev;
- struct urb *urb = usb_alloc_urb(0, gfp);
- struct task_mgmt_iu *iu;
- int err = -ENOMEM;
-
- if (!urb)
- goto err;
-
- iu = kzalloc(sizeof(*iu), gfp);
- if (!iu)
- goto err;
-
- iu->iu_id = IU_ID_TASK_MGMT;
- iu->tag = cpu_to_be16(stream_id);
- int_to_scsilun(cmnd->device->lun, &iu->lun);
-
- iu->function = function;
- switch (function) {
- case TMF_ABORT_TASK:
- if (blk_rq_tagged(cmnd->request))
- iu->task_tag = cpu_to_be16(cmnd->request->tag + 2);
- else
- iu->task_tag = cpu_to_be16(1);
- break;
- }
-
- usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu),
- uas_cmd_cmplt, cmnd);
- urb->transfer_flags |= URB_FREE_BUFFER;
-
- usb_anchor_urb(urb, &devinfo->cmd_urbs);
- err = usb_submit_urb(urb, gfp);
- if (err) {
- usb_unanchor_urb(urb);
- uas_log_cmd_state(cmnd, __func__);
- scmd_printk(KERN_ERR, cmnd, "task submission err %d\n", err);
- goto err;
- }
-
- return 0;
-
-err:
- usb_free_urb(urb);
- return err;
-}
-
/*
* Why should I request the Status IU before sending the Command IU? Spec
* says to, but also says the device may receive them in any order. Seems
static DEF_SCSI_QCMD(uas_queuecommand)
-static int uas_eh_task_mgmt(struct scsi_cmnd *cmnd,
- const char *fname, u8 function)
-{
- struct Scsi_Host *shost = cmnd->device->host;
- struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
- u16 tag = devinfo->qdepth;
- unsigned long flags;
- struct urb *sense_urb;
- int result = SUCCESS;
-
- spin_lock_irqsave(&devinfo->lock, flags);
-
- if (devinfo->resetting) {
- spin_unlock_irqrestore(&devinfo->lock, flags);
- return FAILED;
- }
-
- if (devinfo->running_task) {
- shost_printk(KERN_INFO, shost,
- "%s: %s: error already running a task\n",
- __func__, fname);
- spin_unlock_irqrestore(&devinfo->lock, flags);
- return FAILED;
- }
-
- devinfo->running_task = 1;
- memset(&devinfo->response, 0, sizeof(devinfo->response));
- sense_urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC,
- devinfo->use_streams ? tag : 0);
- if (!sense_urb) {
- shost_printk(KERN_INFO, shost,
- "%s: %s: submit sense urb failed\n",
- __func__, fname);
- devinfo->running_task = 0;
- spin_unlock_irqrestore(&devinfo->lock, flags);
- return FAILED;
- }
- if (uas_submit_task_urb(cmnd, GFP_ATOMIC, function, tag)) {
- shost_printk(KERN_INFO, shost,
- "%s: %s: submit task mgmt urb failed\n",
- __func__, fname);
- devinfo->running_task = 0;
- spin_unlock_irqrestore(&devinfo->lock, flags);
- usb_kill_urb(sense_urb);
- return FAILED;
- }
- spin_unlock_irqrestore(&devinfo->lock, flags);
-
- if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 3000) == 0) {
- /*
- * Note we deliberately do not clear running_task here. If we
- * allow new tasks to be submitted, there is no way to figure
- * out if a received response_iu is for the failed task or for
- * the new one. A bus-reset will eventually clear running_task.
- */
- shost_printk(KERN_INFO, shost,
- "%s: %s timed out\n", __func__, fname);
- return FAILED;
- }
-
- spin_lock_irqsave(&devinfo->lock, flags);
- devinfo->running_task = 0;
- if (be16_to_cpu(devinfo->response.tag) != tag) {
- shost_printk(KERN_INFO, shost,
- "%s: %s failed (wrong tag %d/%d)\n", __func__,
- fname, be16_to_cpu(devinfo->response.tag), tag);
- result = FAILED;
- } else if (devinfo->response.response_code != RC_TMF_COMPLETE) {
- shost_printk(KERN_INFO, shost,
- "%s: %s failed (rc 0x%x)\n", __func__,
- fname, devinfo->response.response_code);
- result = FAILED;
- }
- spin_unlock_irqrestore(&devinfo->lock, flags);
-
- return result;
-}
-
-static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
-{
- struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
- struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
- unsigned long flags;
- int ret;
-
- spin_lock_irqsave(&devinfo->lock, flags);
-
- if (devinfo->resetting) {
- spin_unlock_irqrestore(&devinfo->lock, flags);
- return FAILED;
- }
-
- uas_mark_cmd_dead(devinfo, cmdinfo, DID_ABORT, __func__);
- if (cmdinfo->state & COMMAND_INFLIGHT) {
- spin_unlock_irqrestore(&devinfo->lock, flags);
- ret = uas_eh_task_mgmt(cmnd, "ABORT TASK", TMF_ABORT_TASK);
- } else {
- uas_unlink_data_urbs(devinfo, cmdinfo, &flags);
- uas_try_complete(cmnd, __func__);
- spin_unlock_irqrestore(&devinfo->lock, flags);
- ret = SUCCESS;
- }
- return ret;
-}
-
-static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
-{
- sdev_printk(KERN_INFO, cmnd->device, "%s\n", __func__);
- return uas_eh_task_mgmt(cmnd, "LOGICAL UNIT RESET",
- TMF_LOGICAL_UNIT_RESET);
-}
-
static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
{
struct scsi_device *sdev = cmnd->device;
.queuecommand = uas_queuecommand,
.slave_alloc = uas_slave_alloc,
.slave_configure = uas_slave_configure,
- .eh_abort_handler = uas_eh_abort_handler,
- .eh_device_reset_handler = uas_eh_device_reset_handler,
.eh_bus_reset_handler = uas_eh_bus_reset_handler,
.can_queue = 65536, /* Is there a limit on the _host_ ? */
.this_id = -1,
devinfo->intf = intf;
devinfo->udev = udev;
devinfo->resetting = 0;
- devinfo->running_task = 0;
devinfo->shutdown = 0;
devinfo->flags = id->driver_info;
usb_stor_adjust_quirks(udev, &devinfo->flags);
projects / karo-tx-linux.git / blobdiff