forked from Minki/linux
aa742683bb
Some devices send response IUs when you'd expect a sense IU. As a response to a wrong LUN that is within spec. We cannot get away without handling for response IUs. This version fixes the issues Hans raised. Signed-off-by: Oliver Neukum <oneukum@suse.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1177 lines
31 KiB
C
1177 lines
31 KiB
C
/*
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* USB Attached SCSI
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* Note that this is not the same as the USB Mass Storage driver
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*
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* Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2014
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* Copyright Matthew Wilcox for Intel Corp, 2010
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* Copyright Sarah Sharp for Intel Corp, 2010
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*
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* Distributed under the terms of the GNU GPL, version two.
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*/
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/usb_usual.h>
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#include <linux/usb/hcd.h>
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#include <linux/usb/storage.h>
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#include <linux/usb/uas.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_tcq.h>
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#include "uas-detect.h"
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#include "scsiglue.h"
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#define MAX_CMNDS 256
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struct uas_dev_info {
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struct usb_interface *intf;
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struct usb_device *udev;
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struct usb_anchor cmd_urbs;
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struct usb_anchor sense_urbs;
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struct usb_anchor data_urbs;
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unsigned long flags;
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int qdepth, resetting;
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unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
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unsigned use_streams:1;
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unsigned shutdown:1;
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struct scsi_cmnd *cmnd[MAX_CMNDS];
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spinlock_t lock;
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struct work_struct work;
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};
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enum {
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SUBMIT_STATUS_URB = BIT(1),
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ALLOC_DATA_IN_URB = BIT(2),
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SUBMIT_DATA_IN_URB = BIT(3),
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ALLOC_DATA_OUT_URB = BIT(4),
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SUBMIT_DATA_OUT_URB = BIT(5),
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ALLOC_CMD_URB = BIT(6),
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SUBMIT_CMD_URB = BIT(7),
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COMMAND_INFLIGHT = BIT(8),
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DATA_IN_URB_INFLIGHT = BIT(9),
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DATA_OUT_URB_INFLIGHT = BIT(10),
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COMMAND_ABORTED = BIT(11),
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IS_IN_WORK_LIST = BIT(12),
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};
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/* Overrides scsi_pointer */
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struct uas_cmd_info {
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unsigned int state;
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unsigned int uas_tag;
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struct urb *cmd_urb;
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struct urb *data_in_urb;
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struct urb *data_out_urb;
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};
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/* I hate forward declarations, but I actually have a loop */
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static int uas_submit_urbs(struct scsi_cmnd *cmnd,
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struct uas_dev_info *devinfo);
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static void uas_do_work(struct work_struct *work);
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static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
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static void uas_free_streams(struct uas_dev_info *devinfo);
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static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
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int status);
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static void uas_do_work(struct work_struct *work)
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{
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struct uas_dev_info *devinfo =
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container_of(work, struct uas_dev_info, work);
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struct uas_cmd_info *cmdinfo;
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struct scsi_cmnd *cmnd;
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unsigned long flags;
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int i, err;
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spin_lock_irqsave(&devinfo->lock, flags);
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if (devinfo->resetting)
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goto out;
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for (i = 0; i < devinfo->qdepth; i++) {
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if (!devinfo->cmnd[i])
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continue;
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cmnd = devinfo->cmnd[i];
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cmdinfo = (void *)&cmnd->SCp;
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if (!(cmdinfo->state & IS_IN_WORK_LIST))
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continue;
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err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
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if (!err)
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cmdinfo->state &= ~IS_IN_WORK_LIST;
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else
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schedule_work(&devinfo->work);
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}
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out:
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spin_unlock_irqrestore(&devinfo->lock, flags);
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}
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static void uas_add_work(struct uas_cmd_info *cmdinfo)
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{
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struct scsi_pointer *scp = (void *)cmdinfo;
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struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
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struct uas_dev_info *devinfo = cmnd->device->hostdata;
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lockdep_assert_held(&devinfo->lock);
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cmdinfo->state |= IS_IN_WORK_LIST;
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schedule_work(&devinfo->work);
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}
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static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
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{
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struct uas_cmd_info *cmdinfo;
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struct scsi_cmnd *cmnd;
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unsigned long flags;
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int i, err;
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spin_lock_irqsave(&devinfo->lock, flags);
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for (i = 0; i < devinfo->qdepth; i++) {
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if (!devinfo->cmnd[i])
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continue;
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cmnd = devinfo->cmnd[i];
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cmdinfo = (void *)&cmnd->SCp;
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uas_log_cmd_state(cmnd, __func__, 0);
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/* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
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cmdinfo->state &= ~COMMAND_INFLIGHT;
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cmnd->result = result << 16;
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err = uas_try_complete(cmnd, __func__);
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WARN_ON(err != 0);
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}
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spin_unlock_irqrestore(&devinfo->lock, flags);
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}
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static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
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{
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struct sense_iu *sense_iu = urb->transfer_buffer;
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struct scsi_device *sdev = cmnd->device;
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if (urb->actual_length > 16) {
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unsigned len = be16_to_cpup(&sense_iu->len);
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if (len + 16 != urb->actual_length) {
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int newlen = min(len + 16, urb->actual_length) - 16;
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if (newlen < 0)
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newlen = 0;
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sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
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"disagrees with IU sense data length %d, "
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"using %d bytes of sense data\n", __func__,
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urb->actual_length, len, newlen);
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len = newlen;
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}
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memcpy(cmnd->sense_buffer, sense_iu->sense, len);
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}
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cmnd->result = sense_iu->status;
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}
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static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
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int status)
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{
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struct uas_cmd_info *ci = (void *)&cmnd->SCp;
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struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
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scmd_printk(KERN_INFO, cmnd,
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"%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
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prefix, status, cmdinfo->uas_tag,
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(ci->state & SUBMIT_STATUS_URB) ? " s-st" : "",
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(ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "",
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(ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "",
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(ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "",
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(ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "",
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(ci->state & ALLOC_CMD_URB) ? " a-cmd" : "",
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(ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "",
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(ci->state & COMMAND_INFLIGHT) ? " CMD" : "",
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(ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "",
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(ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "",
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(ci->state & COMMAND_ABORTED) ? " abort" : "",
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(ci->state & IS_IN_WORK_LIST) ? " work" : "");
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scsi_print_command(cmnd);
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}
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static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
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{
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struct uas_cmd_info *cmdinfo;
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if (!cmnd)
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return;
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cmdinfo = (void *)&cmnd->SCp;
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if (cmdinfo->state & SUBMIT_CMD_URB)
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usb_free_urb(cmdinfo->cmd_urb);
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/* data urbs may have never gotten their submit flag set */
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if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
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usb_free_urb(cmdinfo->data_in_urb);
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if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
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usb_free_urb(cmdinfo->data_out_urb);
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}
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static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
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{
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struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
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struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
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lockdep_assert_held(&devinfo->lock);
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if (cmdinfo->state & (COMMAND_INFLIGHT |
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DATA_IN_URB_INFLIGHT |
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DATA_OUT_URB_INFLIGHT |
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COMMAND_ABORTED))
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return -EBUSY;
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devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
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uas_free_unsubmitted_urbs(cmnd);
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cmnd->scsi_done(cmnd);
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return 0;
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}
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static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
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unsigned direction)
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{
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struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
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int err;
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cmdinfo->state |= direction | SUBMIT_STATUS_URB;
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err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
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if (err) {
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uas_add_work(cmdinfo);
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}
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}
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static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
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{
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u8 response_code = riu->response_code;
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switch (response_code) {
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case RC_INCORRECT_LUN:
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cmnd->result = DID_BAD_TARGET << 16;
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break;
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case RC_TMF_SUCCEEDED:
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cmnd->result = DID_OK << 16;
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break;
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case RC_TMF_NOT_SUPPORTED:
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cmnd->result = DID_TARGET_FAILURE << 16;
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break;
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default:
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uas_log_cmd_state(cmnd, "response iu", response_code);
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cmnd->result = DID_ERROR << 16;
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break;
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}
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return response_code == RC_TMF_SUCCEEDED;
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}
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static void uas_stat_cmplt(struct urb *urb)
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{
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struct iu *iu = urb->transfer_buffer;
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struct Scsi_Host *shost = urb->context;
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struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
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struct urb *data_in_urb = NULL;
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struct urb *data_out_urb = NULL;
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struct scsi_cmnd *cmnd;
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struct uas_cmd_info *cmdinfo;
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unsigned long flags;
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unsigned int idx;
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int status = urb->status;
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bool success;
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spin_lock_irqsave(&devinfo->lock, flags);
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if (devinfo->resetting)
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goto out;
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if (status) {
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if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
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dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
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goto out;
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}
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idx = be16_to_cpup(&iu->tag) - 1;
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if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
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dev_err(&urb->dev->dev,
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"stat urb: no pending cmd for uas-tag %d\n", idx + 1);
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goto out;
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}
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cmnd = devinfo->cmnd[idx];
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cmdinfo = (void *)&cmnd->SCp;
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if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
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uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
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goto out;
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}
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switch (iu->iu_id) {
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case IU_ID_STATUS:
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uas_sense(urb, cmnd);
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if (cmnd->result != 0) {
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/* cancel data transfers on error */
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data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
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data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
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}
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cmdinfo->state &= ~COMMAND_INFLIGHT;
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uas_try_complete(cmnd, __func__);
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break;
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case IU_ID_READ_READY:
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if (!cmdinfo->data_in_urb ||
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(cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
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uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
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break;
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}
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uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
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break;
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case IU_ID_WRITE_READY:
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if (!cmdinfo->data_out_urb ||
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(cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
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uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
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break;
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}
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uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
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break;
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case IU_ID_RESPONSE:
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cmdinfo->state &= ~COMMAND_INFLIGHT;
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success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
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if (!success) {
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/* Error, cancel data transfers */
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data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
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data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
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}
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uas_try_complete(cmnd, __func__);
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break;
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default:
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uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
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}
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out:
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usb_free_urb(urb);
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spin_unlock_irqrestore(&devinfo->lock, flags);
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/* Unlinking of data urbs must be done without holding the lock */
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if (data_in_urb) {
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usb_unlink_urb(data_in_urb);
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usb_put_urb(data_in_urb);
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}
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if (data_out_urb) {
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usb_unlink_urb(data_out_urb);
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usb_put_urb(data_out_urb);
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}
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}
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static void uas_data_cmplt(struct urb *urb)
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{
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struct scsi_cmnd *cmnd = urb->context;
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struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
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struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
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struct scsi_data_buffer *sdb = NULL;
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unsigned long flags;
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int status = urb->status;
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spin_lock_irqsave(&devinfo->lock, flags);
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if (cmdinfo->data_in_urb == urb) {
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sdb = scsi_in(cmnd);
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cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
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cmdinfo->data_in_urb = NULL;
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} else if (cmdinfo->data_out_urb == urb) {
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sdb = scsi_out(cmnd);
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cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
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cmdinfo->data_out_urb = NULL;
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}
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if (sdb == NULL) {
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WARN_ON_ONCE(1);
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goto out;
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}
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if (devinfo->resetting)
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goto out;
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/* Data urbs should not complete before the cmd urb is submitted */
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if (cmdinfo->state & SUBMIT_CMD_URB) {
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uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
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goto out;
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}
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if (status) {
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if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
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uas_log_cmd_state(cmnd, "data cmplt err", status);
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/* error: no data transfered */
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sdb->resid = sdb->length;
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} else {
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sdb->resid = sdb->length - urb->actual_length;
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}
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uas_try_complete(cmnd, __func__);
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out:
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usb_free_urb(urb);
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spin_unlock_irqrestore(&devinfo->lock, flags);
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}
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static void uas_cmd_cmplt(struct urb *urb)
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{
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if (urb->status)
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dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
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usb_free_urb(urb);
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}
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static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
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struct scsi_cmnd *cmnd,
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enum dma_data_direction dir)
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{
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struct usb_device *udev = devinfo->udev;
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struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
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struct urb *urb = usb_alloc_urb(0, gfp);
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struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
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? scsi_in(cmnd) : scsi_out(cmnd);
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unsigned int pipe = (dir == DMA_FROM_DEVICE)
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? devinfo->data_in_pipe : devinfo->data_out_pipe;
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if (!urb)
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goto out;
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usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
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uas_data_cmplt, cmnd);
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if (devinfo->use_streams)
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urb->stream_id = cmdinfo->uas_tag;
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urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
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urb->sg = sdb->table.sgl;
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out:
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return urb;
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}
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static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
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struct scsi_cmnd *cmnd)
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{
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struct usb_device *udev = devinfo->udev;
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struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
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struct urb *urb = usb_alloc_urb(0, gfp);
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struct sense_iu *iu;
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if (!urb)
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goto out;
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iu = kzalloc(sizeof(*iu), gfp);
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if (!iu)
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goto free;
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usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
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uas_stat_cmplt, cmnd->device->host);
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if (devinfo->use_streams)
|
|
urb->stream_id = cmdinfo->uas_tag;
|
|
urb->transfer_flags |= URB_FREE_BUFFER;
|
|
out:
|
|
return urb;
|
|
free:
|
|
usb_free_urb(urb);
|
|
return NULL;
|
|
}
|
|
|
|
static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
|
|
struct scsi_cmnd *cmnd)
|
|
{
|
|
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;
|
|
|
|
if (!urb)
|
|
goto out;
|
|
|
|
len = cmnd->cmd_len - 16;
|
|
if (len < 0)
|
|
len = 0;
|
|
len = ALIGN(len, 4);
|
|
iu = kzalloc(sizeof(*iu) + len, gfp);
|
|
if (!iu)
|
|
goto free;
|
|
|
|
iu->iu_id = IU_ID_COMMAND;
|
|
iu->tag = cpu_to_be16(cmdinfo->uas_tag);
|
|
iu->prio_attr = UAS_SIMPLE_TAG;
|
|
iu->len = len;
|
|
int_to_scsilun(sdev->lun, &iu->lun);
|
|
memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
|
|
|
|
usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
|
|
uas_cmd_cmplt, NULL);
|
|
urb->transfer_flags |= URB_FREE_BUFFER;
|
|
out:
|
|
return urb;
|
|
free:
|
|
usb_free_urb(urb);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
* daft to me.
|
|
*/
|
|
|
|
static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
|
|
{
|
|
struct uas_dev_info *devinfo = cmnd->device->hostdata;
|
|
struct urb *urb;
|
|
int err;
|
|
|
|
urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
|
|
if (!urb)
|
|
return NULL;
|
|
usb_anchor_urb(urb, &devinfo->sense_urbs);
|
|
err = usb_submit_urb(urb, gfp);
|
|
if (err) {
|
|
usb_unanchor_urb(urb);
|
|
uas_log_cmd_state(cmnd, "sense submit err", err);
|
|
usb_free_urb(urb);
|
|
return NULL;
|
|
}
|
|
return urb;
|
|
}
|
|
|
|
static int uas_submit_urbs(struct scsi_cmnd *cmnd,
|
|
struct uas_dev_info *devinfo)
|
|
{
|
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
|
struct urb *urb;
|
|
int err;
|
|
|
|
lockdep_assert_held(&devinfo->lock);
|
|
if (cmdinfo->state & SUBMIT_STATUS_URB) {
|
|
urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
|
|
if (!urb)
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
cmdinfo->state &= ~SUBMIT_STATUS_URB;
|
|
}
|
|
|
|
if (cmdinfo->state & ALLOC_DATA_IN_URB) {
|
|
cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
|
|
cmnd, DMA_FROM_DEVICE);
|
|
if (!cmdinfo->data_in_urb)
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
cmdinfo->state &= ~ALLOC_DATA_IN_URB;
|
|
}
|
|
|
|
if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
|
|
usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
|
|
err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
|
|
if (err) {
|
|
usb_unanchor_urb(cmdinfo->data_in_urb);
|
|
uas_log_cmd_state(cmnd, "data in submit err", err);
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
}
|
|
cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
|
|
cmdinfo->state |= DATA_IN_URB_INFLIGHT;
|
|
}
|
|
|
|
if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
|
|
cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
|
|
cmnd, DMA_TO_DEVICE);
|
|
if (!cmdinfo->data_out_urb)
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
|
|
}
|
|
|
|
if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
|
|
usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
|
|
err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
|
|
if (err) {
|
|
usb_unanchor_urb(cmdinfo->data_out_urb);
|
|
uas_log_cmd_state(cmnd, "data out submit err", err);
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
}
|
|
cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
|
|
cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
|
|
}
|
|
|
|
if (cmdinfo->state & ALLOC_CMD_URB) {
|
|
cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
|
|
if (!cmdinfo->cmd_urb)
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
cmdinfo->state &= ~ALLOC_CMD_URB;
|
|
}
|
|
|
|
if (cmdinfo->state & SUBMIT_CMD_URB) {
|
|
usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
|
|
err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
|
|
if (err) {
|
|
usb_unanchor_urb(cmdinfo->cmd_urb);
|
|
uas_log_cmd_state(cmnd, "cmd submit err", err);
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
}
|
|
cmdinfo->cmd_urb = NULL;
|
|
cmdinfo->state &= ~SUBMIT_CMD_URB;
|
|
cmdinfo->state |= COMMAND_INFLIGHT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
|
|
void (*done)(struct scsi_cmnd *))
|
|
{
|
|
struct scsi_device *sdev = cmnd->device;
|
|
struct uas_dev_info *devinfo = sdev->hostdata;
|
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
|
unsigned long flags;
|
|
int idx, err;
|
|
|
|
BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
|
|
|
|
/* Re-check scsi_block_requests now that we've the host-lock */
|
|
if (cmnd->device->host->host_self_blocked)
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
|
|
if ((devinfo->flags & US_FL_NO_ATA_1X) &&
|
|
(cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
|
|
memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
|
|
sizeof(usb_stor_sense_invalidCDB));
|
|
cmnd->result = SAM_STAT_CHECK_CONDITION;
|
|
cmnd->scsi_done(cmnd);
|
|
return 0;
|
|
}
|
|
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
|
|
if (devinfo->resetting) {
|
|
cmnd->result = DID_ERROR << 16;
|
|
cmnd->scsi_done(cmnd);
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
cmnd->scsi_done = done;
|
|
|
|
memset(cmdinfo, 0, sizeof(*cmdinfo));
|
|
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) {
|
|
case DMA_FROM_DEVICE:
|
|
cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
|
|
break;
|
|
case DMA_BIDIRECTIONAL:
|
|
cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
|
|
case DMA_TO_DEVICE:
|
|
cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
|
|
case DMA_NONE:
|
|
break;
|
|
}
|
|
|
|
if (!devinfo->use_streams)
|
|
cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
|
|
|
|
err = uas_submit_urbs(cmnd, devinfo);
|
|
if (err) {
|
|
/* If we did nothing, give up now */
|
|
if (cmdinfo->state & SUBMIT_STATUS_URB) {
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
}
|
|
uas_add_work(cmdinfo);
|
|
}
|
|
|
|
devinfo->cmnd[idx] = cmnd;
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static DEF_SCSI_QCMD(uas_queuecommand)
|
|
|
|
/*
|
|
* For now we do not support actually sending an abort to the device, so
|
|
* this eh always fails. Still we must define it to make sure that we've
|
|
* dropped all references to the cmnd in question once this function exits.
|
|
*/
|
|
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;
|
|
struct urb *data_in_urb = NULL;
|
|
struct urb *data_out_urb = NULL;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
|
|
uas_log_cmd_state(cmnd, __func__, 0);
|
|
|
|
/* Ensure that try_complete does not call scsi_done */
|
|
cmdinfo->state |= COMMAND_ABORTED;
|
|
|
|
/* Drop all refs to this cmnd, kill data urbs to break their ref */
|
|
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)
|
|
data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
|
|
|
|
uas_free_unsubmitted_urbs(cmnd);
|
|
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
|
|
if (data_in_urb) {
|
|
usb_kill_urb(data_in_urb);
|
|
usb_put_urb(data_in_urb);
|
|
}
|
|
if (data_out_urb) {
|
|
usb_kill_urb(data_out_urb);
|
|
usb_put_urb(data_out_urb);
|
|
}
|
|
|
|
return FAILED;
|
|
}
|
|
|
|
static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
|
|
{
|
|
struct scsi_device *sdev = cmnd->device;
|
|
struct uas_dev_info *devinfo = sdev->hostdata;
|
|
struct usb_device *udev = devinfo->udev;
|
|
unsigned long flags;
|
|
int err;
|
|
|
|
err = usb_lock_device_for_reset(udev, devinfo->intf);
|
|
if (err) {
|
|
shost_printk(KERN_ERR, sdev->host,
|
|
"%s FAILED to get lock err %d\n", __func__, err);
|
|
return FAILED;
|
|
}
|
|
|
|
shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
|
|
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
devinfo->resetting = 1;
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
|
|
usb_kill_anchored_urbs(&devinfo->cmd_urbs);
|
|
usb_kill_anchored_urbs(&devinfo->sense_urbs);
|
|
usb_kill_anchored_urbs(&devinfo->data_urbs);
|
|
uas_zap_pending(devinfo, DID_RESET);
|
|
|
|
err = usb_reset_device(udev);
|
|
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
devinfo->resetting = 0;
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
|
|
usb_unlock_device(udev);
|
|
|
|
if (err) {
|
|
shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
|
|
__func__, err);
|
|
return FAILED;
|
|
}
|
|
|
|
shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
|
|
return SUCCESS;
|
|
}
|
|
|
|
static int uas_slave_alloc(struct scsi_device *sdev)
|
|
{
|
|
struct uas_dev_info *devinfo =
|
|
(struct uas_dev_info *)sdev->host->hostdata;
|
|
|
|
sdev->hostdata = devinfo;
|
|
|
|
/* USB has unusual DMA-alignment requirements: Although the
|
|
* starting address of each scatter-gather element doesn't matter,
|
|
* the length of each element except the last must be divisible
|
|
* by the Bulk maxpacket value. There's currently no way to
|
|
* express this by block-layer constraints, so we'll cop out
|
|
* and simply require addresses to be aligned at 512-byte
|
|
* boundaries. This is okay since most block I/O involves
|
|
* hardware sectors that are multiples of 512 bytes in length,
|
|
* and since host controllers up through USB 2.0 have maxpacket
|
|
* values no larger than 512.
|
|
*
|
|
* But it doesn't suffice for Wireless USB, where Bulk maxpacket
|
|
* values can be as large as 2048. To make that work properly
|
|
* will require changes to the block layer.
|
|
*/
|
|
blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
|
|
|
|
if (devinfo->flags & US_FL_MAX_SECTORS_64)
|
|
blk_queue_max_hw_sectors(sdev->request_queue, 64);
|
|
else if (devinfo->flags & US_FL_MAX_SECTORS_240)
|
|
blk_queue_max_hw_sectors(sdev->request_queue, 240);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int uas_slave_configure(struct scsi_device *sdev)
|
|
{
|
|
struct uas_dev_info *devinfo = sdev->hostdata;
|
|
|
|
if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
|
|
sdev->no_report_opcodes = 1;
|
|
|
|
/* A few buggy USB-ATA bridges don't understand FUA */
|
|
if (devinfo->flags & US_FL_BROKEN_FUA)
|
|
sdev->broken_fua = 1;
|
|
|
|
scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
|
|
return 0;
|
|
}
|
|
|
|
static struct scsi_host_template uas_host_template = {
|
|
.module = THIS_MODULE,
|
|
.name = "uas",
|
|
.queuecommand = uas_queuecommand,
|
|
.slave_alloc = uas_slave_alloc,
|
|
.slave_configure = uas_slave_configure,
|
|
.eh_abort_handler = uas_eh_abort_handler,
|
|
.eh_bus_reset_handler = uas_eh_bus_reset_handler,
|
|
.can_queue = 65536, /* Is there a limit on the _host_ ? */
|
|
.this_id = -1,
|
|
.sg_tablesize = SG_NONE,
|
|
.skip_settle_delay = 1,
|
|
};
|
|
|
|
#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
|
|
vendorName, productName, useProtocol, useTransport, \
|
|
initFunction, flags) \
|
|
{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
|
|
.driver_info = (flags) }
|
|
|
|
static struct usb_device_id uas_usb_ids[] = {
|
|
# include "unusual_uas.h"
|
|
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
|
|
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, uas_usb_ids);
|
|
|
|
#undef UNUSUAL_DEV
|
|
|
|
static int uas_switch_interface(struct usb_device *udev,
|
|
struct usb_interface *intf)
|
|
{
|
|
int alt;
|
|
|
|
alt = uas_find_uas_alt_setting(intf);
|
|
if (alt < 0)
|
|
return alt;
|
|
|
|
return usb_set_interface(udev,
|
|
intf->altsetting[0].desc.bInterfaceNumber, alt);
|
|
}
|
|
|
|
static int uas_configure_endpoints(struct uas_dev_info *devinfo)
|
|
{
|
|
struct usb_host_endpoint *eps[4] = { };
|
|
struct usb_device *udev = devinfo->udev;
|
|
int r;
|
|
|
|
r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
|
|
if (r)
|
|
return r;
|
|
|
|
devinfo->cmd_pipe = usb_sndbulkpipe(udev,
|
|
usb_endpoint_num(&eps[0]->desc));
|
|
devinfo->status_pipe = usb_rcvbulkpipe(udev,
|
|
usb_endpoint_num(&eps[1]->desc));
|
|
devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
|
|
usb_endpoint_num(&eps[2]->desc));
|
|
devinfo->data_out_pipe = usb_sndbulkpipe(udev,
|
|
usb_endpoint_num(&eps[3]->desc));
|
|
|
|
if (udev->speed < USB_SPEED_SUPER) {
|
|
devinfo->qdepth = 32;
|
|
devinfo->use_streams = 0;
|
|
} else {
|
|
devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
|
|
3, MAX_CMNDS, GFP_NOIO);
|
|
if (devinfo->qdepth < 0)
|
|
return devinfo->qdepth;
|
|
devinfo->use_streams = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void uas_free_streams(struct uas_dev_info *devinfo)
|
|
{
|
|
struct usb_device *udev = devinfo->udev;
|
|
struct usb_host_endpoint *eps[3];
|
|
|
|
eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
|
|
eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
|
|
eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
|
|
usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
|
|
}
|
|
|
|
static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
|
|
{
|
|
int result = -ENOMEM;
|
|
struct Scsi_Host *shost = NULL;
|
|
struct uas_dev_info *devinfo;
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
unsigned long dev_flags;
|
|
|
|
if (!uas_use_uas_driver(intf, id, &dev_flags))
|
|
return -ENODEV;
|
|
|
|
if (uas_switch_interface(udev, intf))
|
|
return -ENODEV;
|
|
|
|
shost = scsi_host_alloc(&uas_host_template,
|
|
sizeof(struct uas_dev_info));
|
|
if (!shost)
|
|
goto set_alt0;
|
|
|
|
shost->max_cmd_len = 16 + 252;
|
|
shost->max_id = 1;
|
|
shost->max_lun = 256;
|
|
shost->max_channel = 0;
|
|
shost->sg_tablesize = udev->bus->sg_tablesize;
|
|
|
|
devinfo = (struct uas_dev_info *)shost->hostdata;
|
|
devinfo->intf = intf;
|
|
devinfo->udev = udev;
|
|
devinfo->resetting = 0;
|
|
devinfo->shutdown = 0;
|
|
devinfo->flags = dev_flags;
|
|
init_usb_anchor(&devinfo->cmd_urbs);
|
|
init_usb_anchor(&devinfo->sense_urbs);
|
|
init_usb_anchor(&devinfo->data_urbs);
|
|
spin_lock_init(&devinfo->lock);
|
|
INIT_WORK(&devinfo->work, uas_do_work);
|
|
|
|
result = uas_configure_endpoints(devinfo);
|
|
if (result)
|
|
goto set_alt0;
|
|
|
|
usb_set_intfdata(intf, shost);
|
|
result = scsi_add_host(shost, &intf->dev);
|
|
if (result)
|
|
goto free_streams;
|
|
|
|
scsi_scan_host(shost);
|
|
return result;
|
|
|
|
free_streams:
|
|
uas_free_streams(devinfo);
|
|
usb_set_intfdata(intf, NULL);
|
|
set_alt0:
|
|
usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
|
|
if (shost)
|
|
scsi_host_put(shost);
|
|
return result;
|
|
}
|
|
|
|
static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
|
|
{
|
|
unsigned long flags;
|
|
int i, r = 1;
|
|
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
|
|
for (i = 0; i < devinfo->qdepth; i++) {
|
|
if (devinfo->cmnd[i]) {
|
|
r = 0; /* Not empty */
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
|
|
* get empty while there still is more work to do due to sense-urbs completing
|
|
* with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
|
|
*/
|
|
static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
|
|
{
|
|
unsigned long start_time;
|
|
int r;
|
|
|
|
start_time = jiffies;
|
|
do {
|
|
flush_work(&devinfo->work);
|
|
|
|
r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
|
|
if (r == 0)
|
|
return -ETIME;
|
|
|
|
r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
|
|
if (r == 0)
|
|
return -ETIME;
|
|
|
|
if (time_after(jiffies, start_time + 5 * HZ))
|
|
return -ETIME;
|
|
} while (!uas_cmnd_list_empty(devinfo));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int uas_pre_reset(struct usb_interface *intf)
|
|
{
|
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
|
unsigned long flags;
|
|
|
|
if (devinfo->shutdown)
|
|
return 0;
|
|
|
|
/* Block new requests */
|
|
spin_lock_irqsave(shost->host_lock, flags);
|
|
scsi_block_requests(shost);
|
|
spin_unlock_irqrestore(shost->host_lock, flags);
|
|
|
|
if (uas_wait_for_pending_cmnds(devinfo) != 0) {
|
|
shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
|
|
scsi_unblock_requests(shost);
|
|
return 1;
|
|
}
|
|
|
|
uas_free_streams(devinfo);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int uas_post_reset(struct usb_interface *intf)
|
|
{
|
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
|
unsigned long flags;
|
|
int err;
|
|
|
|
if (devinfo->shutdown)
|
|
return 0;
|
|
|
|
err = uas_configure_endpoints(devinfo);
|
|
if (err) {
|
|
shost_printk(KERN_ERR, shost,
|
|
"%s: alloc streams error %d after reset",
|
|
__func__, err);
|
|
return 1;
|
|
}
|
|
|
|
spin_lock_irqsave(shost->host_lock, flags);
|
|
scsi_report_bus_reset(shost, 0);
|
|
spin_unlock_irqrestore(shost->host_lock, flags);
|
|
|
|
scsi_unblock_requests(shost);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int uas_suspend(struct usb_interface *intf, pm_message_t message)
|
|
{
|
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
|
|
|
if (uas_wait_for_pending_cmnds(devinfo) != 0) {
|
|
shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
|
|
return -ETIME;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int uas_resume(struct usb_interface *intf)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int uas_reset_resume(struct usb_interface *intf)
|
|
{
|
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
|
unsigned long flags;
|
|
int err;
|
|
|
|
err = uas_configure_endpoints(devinfo);
|
|
if (err) {
|
|
shost_printk(KERN_ERR, shost,
|
|
"%s: alloc streams error %d after reset",
|
|
__func__, err);
|
|
return -EIO;
|
|
}
|
|
|
|
spin_lock_irqsave(shost->host_lock, flags);
|
|
scsi_report_bus_reset(shost, 0);
|
|
spin_unlock_irqrestore(shost->host_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void uas_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
devinfo->resetting = 1;
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
|
|
cancel_work_sync(&devinfo->work);
|
|
usb_kill_anchored_urbs(&devinfo->cmd_urbs);
|
|
usb_kill_anchored_urbs(&devinfo->sense_urbs);
|
|
usb_kill_anchored_urbs(&devinfo->data_urbs);
|
|
uas_zap_pending(devinfo, DID_NO_CONNECT);
|
|
|
|
scsi_remove_host(shost);
|
|
uas_free_streams(devinfo);
|
|
scsi_host_put(shost);
|
|
}
|
|
|
|
/*
|
|
* Put the device back in usb-storage mode on shutdown, as some BIOS-es
|
|
* hang on reboot when the device is still in uas mode. Note the reset is
|
|
* necessary as some devices won't revert to usb-storage mode without it.
|
|
*/
|
|
static void uas_shutdown(struct device *dev)
|
|
{
|
|
struct usb_interface *intf = to_usb_interface(dev);
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
|
|
|
if (system_state != SYSTEM_RESTART)
|
|
return;
|
|
|
|
devinfo->shutdown = 1;
|
|
uas_free_streams(devinfo);
|
|
usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
|
|
usb_reset_device(udev);
|
|
}
|
|
|
|
static struct usb_driver uas_driver = {
|
|
.name = "uas",
|
|
.probe = uas_probe,
|
|
.disconnect = uas_disconnect,
|
|
.pre_reset = uas_pre_reset,
|
|
.post_reset = uas_post_reset,
|
|
.suspend = uas_suspend,
|
|
.resume = uas_resume,
|
|
.reset_resume = uas_reset_resume,
|
|
.drvwrap.driver.shutdown = uas_shutdown,
|
|
.id_table = uas_usb_ids,
|
|
};
|
|
|
|
module_usb_driver(uas_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR(
|
|
"Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");
|