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1994ff405e
Forgot to unlock in the uas_eh_task_mgmt error paths. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reported-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
984 lines
26 KiB
C
984 lines
26 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 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/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_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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/*
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* The r00-r01c specs define this version of the SENSE IU data structure.
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* It's still in use by several different firmware releases.
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*/
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struct sense_iu_old {
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__u8 iu_id;
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__u8 rsvd1;
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__be16 tag;
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__be16 len;
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__u8 status;
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__u8 service_response;
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__u8 sense[SCSI_SENSE_BUFFERSIZE];
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};
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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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int qdepth, resetting;
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struct response_ui response;
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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 uas_sense_old:1;
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struct scsi_cmnd *cmnd;
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spinlock_t lock;
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};
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enum {
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SUBMIT_STATUS_URB = (1 << 1),
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ALLOC_DATA_IN_URB = (1 << 2),
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SUBMIT_DATA_IN_URB = (1 << 3),
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ALLOC_DATA_OUT_URB = (1 << 4),
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SUBMIT_DATA_OUT_URB = (1 << 5),
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ALLOC_CMD_URB = (1 << 6),
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SUBMIT_CMD_URB = (1 << 7),
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COMMAND_INFLIGHT = (1 << 8),
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DATA_IN_URB_INFLIGHT = (1 << 9),
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DATA_OUT_URB_INFLIGHT = (1 << 10),
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COMMAND_COMPLETED = (1 << 11),
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COMMAND_ABORTED = (1 << 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 stream;
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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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struct list_head list;
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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, gfp_t gfp);
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static void uas_do_work(struct work_struct *work);
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static DECLARE_WORK(uas_work, uas_do_work);
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static DEFINE_SPINLOCK(uas_work_lock);
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static LIST_HEAD(uas_work_list);
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static void uas_do_work(struct work_struct *work)
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{
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struct uas_cmd_info *cmdinfo;
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struct uas_cmd_info *temp;
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struct list_head list;
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unsigned long flags;
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int err;
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spin_lock_irq(&uas_work_lock);
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list_replace_init(&uas_work_list, &list);
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spin_unlock_irq(&uas_work_lock);
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list_for_each_entry_safe(cmdinfo, temp, &list, list) {
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struct scsi_pointer *scp = (void *)cmdinfo;
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struct scsi_cmnd *cmnd = container_of(scp,
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struct scsi_cmnd, SCp);
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struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
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spin_lock_irqsave(&devinfo->lock, flags);
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err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
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spin_unlock_irqrestore(&devinfo->lock, flags);
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if (err) {
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list_del(&cmdinfo->list);
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spin_lock_irq(&uas_work_lock);
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list_add_tail(&cmdinfo->list, &uas_work_list);
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spin_unlock_irq(&uas_work_lock);
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schedule_work(&uas_work);
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}
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}
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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_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
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{
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struct sense_iu_old *sense_iu = urb->transfer_buffer;
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struct scsi_device *sdev = cmnd->device;
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if (urb->actual_length > 8) {
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unsigned len = be16_to_cpup(&sense_iu->len) - 2;
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if (len + 8 != urb->actual_length) {
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int newlen = min(len + 8, urb->actual_length) - 8;
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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 *caller)
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{
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struct uas_cmd_info *ci = (void *)&cmnd->SCp;
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scmd_printk(KERN_INFO, cmnd, "%s %p tag %d, inflight:"
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"%s%s%s%s%s%s%s%s%s%s%s%s\n",
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caller, cmnd, cmnd->request->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_COMPLETED) ? " done" : "",
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(ci->state & COMMAND_ABORTED) ? " abort" : "");
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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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WARN_ON(!spin_is_locked(&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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return -EBUSY;
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BUG_ON(cmdinfo->state & COMMAND_COMPLETED);
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cmdinfo->state |= COMMAND_COMPLETED;
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usb_free_urb(cmdinfo->data_in_urb);
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usb_free_urb(cmdinfo->data_out_urb);
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if (cmdinfo->state & COMMAND_ABORTED) {
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scmd_printk(KERN_INFO, cmnd, "abort completed\n");
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cmnd->result = DID_ABORT << 16;
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}
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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, GFP_ATOMIC);
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if (err) {
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spin_lock(&uas_work_lock);
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list_add_tail(&cmdinfo->list, &uas_work_list);
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spin_unlock(&uas_work_lock);
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schedule_work(&uas_work);
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}
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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 = (void *)shost->hostdata[0];
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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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u16 tag;
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if (urb->status) {
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dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status);
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usb_free_urb(urb);
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return;
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}
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if (devinfo->resetting) {
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usb_free_urb(urb);
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return;
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}
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spin_lock_irqsave(&devinfo->lock, flags);
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tag = be16_to_cpup(&iu->tag) - 1;
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if (tag == 0)
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cmnd = devinfo->cmnd;
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else
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cmnd = scsi_host_find_tag(shost, tag - 1);
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if (!cmnd) {
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if (iu->iu_id != IU_ID_RESPONSE) {
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usb_free_urb(urb);
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spin_unlock_irqrestore(&devinfo->lock, flags);
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return;
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}
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} else {
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cmdinfo = (void *)&cmnd->SCp;
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}
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switch (iu->iu_id) {
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case IU_ID_STATUS:
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if (devinfo->cmnd == cmnd)
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devinfo->cmnd = NULL;
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if (urb->actual_length < 16)
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devinfo->uas_sense_old = 1;
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if (devinfo->uas_sense_old)
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uas_sense_old(urb, cmnd);
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else
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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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if (cmdinfo->state & DATA_IN_URB_INFLIGHT) {
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spin_unlock_irqrestore(&devinfo->lock, flags);
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usb_unlink_urb(cmdinfo->data_in_urb);
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spin_lock_irqsave(&devinfo->lock, flags);
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}
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if (cmdinfo->state & DATA_OUT_URB_INFLIGHT) {
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spin_unlock_irqrestore(&devinfo->lock, flags);
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usb_unlink_urb(cmdinfo->data_out_urb);
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spin_lock_irqsave(&devinfo->lock, flags);
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}
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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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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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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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/* store results for uas_eh_task_mgmt() */
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memcpy(&devinfo->response, iu, sizeof(devinfo->response));
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break;
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default:
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scmd_printk(KERN_ERR, cmnd,
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"Bogus IU (%d) received on status pipe\n", iu->iu_id);
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}
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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_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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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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} 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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}
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BUG_ON(sdb == NULL);
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if (urb->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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spin_unlock_irqrestore(&devinfo->lock, flags);
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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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unsigned int pipe, u16 stream_id,
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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 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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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 = stream_id;
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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_Host *shost, u16 stream_id)
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{
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struct usb_device *udev = devinfo->udev;
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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, shost);
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urb->stream_id = stream_id;
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urb->transfer_flags |= URB_FREE_BUFFER;
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out:
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return urb;
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free:
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usb_free_urb(urb);
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return NULL;
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}
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static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
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struct scsi_cmnd *cmnd, u16 stream_id)
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{
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struct usb_device *udev = devinfo->udev;
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struct scsi_device *sdev = cmnd->device;
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struct urb *urb = usb_alloc_urb(0, gfp);
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struct command_iu *iu;
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int len;
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|
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if (!urb)
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goto out;
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|
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len = cmnd->cmd_len - 16;
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if (len < 0)
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len = 0;
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len = ALIGN(len, 4);
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iu = kzalloc(sizeof(*iu) + len, gfp);
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if (!iu)
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goto free;
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iu->iu_id = IU_ID_COMMAND;
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if (blk_rq_tagged(cmnd->request))
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iu->tag = cpu_to_be16(cmnd->request->tag + 2);
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else
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iu->tag = cpu_to_be16(1);
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iu->prio_attr = UAS_SIMPLE_TAG;
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iu->len = len;
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int_to_scsilun(sdev->lun, &iu->lun);
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memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
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usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
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usb_free_urb, NULL);
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urb->transfer_flags |= URB_FREE_BUFFER;
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out:
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return urb;
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free:
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usb_free_urb(urb);
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return NULL;
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}
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|
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static int uas_submit_task_urb(struct scsi_cmnd *cmnd, gfp_t gfp,
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u8 function, u16 stream_id)
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{
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struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
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struct usb_device *udev = devinfo->udev;
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struct urb *urb = usb_alloc_urb(0, gfp);
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struct task_mgmt_iu *iu;
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int err = -ENOMEM;
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if (!urb)
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goto err;
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iu = kzalloc(sizeof(*iu), gfp);
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if (!iu)
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goto err;
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iu->iu_id = IU_ID_TASK_MGMT;
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iu->tag = cpu_to_be16(stream_id);
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int_to_scsilun(cmnd->device->lun, &iu->lun);
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iu->function = function;
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switch (function) {
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case TMF_ABORT_TASK:
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if (blk_rq_tagged(cmnd->request))
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iu->task_tag = cpu_to_be16(cmnd->request->tag + 2);
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else
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iu->task_tag = cpu_to_be16(1);
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break;
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}
|
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|
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usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu),
|
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usb_free_urb, NULL);
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urb->transfer_flags |= URB_FREE_BUFFER;
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|
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err = usb_submit_urb(urb, gfp);
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if (err)
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goto err;
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usb_anchor_urb(urb, &devinfo->cmd_urbs);
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|
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return 0;
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|
|
|
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
|
|
* daft to me.
|
|
*/
|
|
|
|
static int uas_submit_sense_urb(struct Scsi_Host *shost,
|
|
gfp_t gfp, unsigned int stream)
|
|
{
|
|
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
|
|
struct urb *urb;
|
|
|
|
urb = uas_alloc_sense_urb(devinfo, gfp, shost, stream);
|
|
if (!urb)
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
if (usb_submit_urb(urb, gfp)) {
|
|
shost_printk(KERN_INFO, shost,
|
|
"sense urb submission failure\n");
|
|
usb_free_urb(urb);
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
}
|
|
usb_anchor_urb(urb, &devinfo->sense_urbs);
|
|
return 0;
|
|
}
|
|
|
|
static int uas_submit_urbs(struct scsi_cmnd *cmnd,
|
|
struct uas_dev_info *devinfo, gfp_t gfp)
|
|
{
|
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
|
int err;
|
|
|
|
WARN_ON(!spin_is_locked(&devinfo->lock));
|
|
if (cmdinfo->state & SUBMIT_STATUS_URB) {
|
|
err = uas_submit_sense_urb(cmnd->device->host, gfp,
|
|
cmdinfo->stream);
|
|
if (err) {
|
|
return err;
|
|
}
|
|
cmdinfo->state &= ~SUBMIT_STATUS_URB;
|
|
}
|
|
|
|
if (cmdinfo->state & ALLOC_DATA_IN_URB) {
|
|
cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
|
|
devinfo->data_in_pipe, cmdinfo->stream,
|
|
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) {
|
|
if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) {
|
|
scmd_printk(KERN_INFO, cmnd,
|
|
"data in urb submission failure\n");
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
}
|
|
cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
|
|
cmdinfo->state |= DATA_IN_URB_INFLIGHT;
|
|
usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
|
|
}
|
|
|
|
if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
|
|
cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
|
|
devinfo->data_out_pipe, cmdinfo->stream,
|
|
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) {
|
|
if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) {
|
|
scmd_printk(KERN_INFO, cmnd,
|
|
"data out urb submission failure\n");
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
}
|
|
cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
|
|
cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
|
|
usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
|
|
}
|
|
|
|
if (cmdinfo->state & ALLOC_CMD_URB) {
|
|
cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd,
|
|
cmdinfo->stream);
|
|
if (!cmdinfo->cmd_urb)
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
cmdinfo->state &= ~ALLOC_CMD_URB;
|
|
}
|
|
|
|
if (cmdinfo->state & SUBMIT_CMD_URB) {
|
|
usb_get_urb(cmdinfo->cmd_urb);
|
|
if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) {
|
|
scmd_printk(KERN_INFO, cmnd,
|
|
"cmd urb submission failure\n");
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
}
|
|
usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
|
|
usb_put_urb(cmdinfo->cmd_urb);
|
|
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 err;
|
|
|
|
BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
|
|
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
if (devinfo->cmnd) {
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
}
|
|
|
|
if (blk_rq_tagged(cmnd->request)) {
|
|
cmdinfo->stream = cmnd->request->tag + 2;
|
|
} else {
|
|
devinfo->cmnd = cmnd;
|
|
cmdinfo->stream = 1;
|
|
}
|
|
|
|
cmnd->scsi_done = done;
|
|
|
|
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);
|
|
cmdinfo->stream = 0;
|
|
}
|
|
|
|
err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
|
|
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;
|
|
}
|
|
spin_lock(&uas_work_lock);
|
|
list_add_tail(&cmdinfo->list, &uas_work_list);
|
|
spin_unlock(&uas_work_lock);
|
|
schedule_work(&uas_work);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
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 = (void *)shost->hostdata[0];
|
|
u16 tag = devinfo->qdepth - 1;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
memset(&devinfo->response, 0, sizeof(devinfo->response));
|
|
if (uas_submit_sense_urb(shost, GFP_ATOMIC, tag)) {
|
|
shost_printk(KERN_INFO, shost,
|
|
"%s: %s: submit sense urb failed\n",
|
|
__func__, fname);
|
|
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);
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
return FAILED;
|
|
}
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
|
|
if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 3000) == 0) {
|
|
shost_printk(KERN_INFO, shost,
|
|
"%s: %s timed out\n", __func__, fname);
|
|
return FAILED;
|
|
}
|
|
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);
|
|
return FAILED;
|
|
}
|
|
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);
|
|
return FAILED;
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
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;
|
|
|
|
uas_log_cmd_state(cmnd, __func__);
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
cmdinfo->state |= COMMAND_ABORTED;
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
ret = uas_eh_task_mgmt(cmnd, "ABORT TASK", TMF_ABORT_TASK);
|
|
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;
|
|
struct uas_dev_info *devinfo = sdev->hostdata;
|
|
struct usb_device *udev = devinfo->udev;
|
|
int err;
|
|
|
|
devinfo->resetting = 1;
|
|
usb_kill_anchored_urbs(&devinfo->cmd_urbs);
|
|
usb_kill_anchored_urbs(&devinfo->sense_urbs);
|
|
usb_kill_anchored_urbs(&devinfo->data_urbs);
|
|
err = usb_reset_device(udev);
|
|
devinfo->resetting = 0;
|
|
|
|
if (err) {
|
|
shost_printk(KERN_INFO, sdev->host, "%s FAILED\n", __func__);
|
|
return FAILED;
|
|
}
|
|
|
|
shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
|
|
return SUCCESS;
|
|
}
|
|
|
|
static int uas_slave_alloc(struct scsi_device *sdev)
|
|
{
|
|
sdev->hostdata = (void *)sdev->host->hostdata[0];
|
|
return 0;
|
|
}
|
|
|
|
static int uas_slave_configure(struct scsi_device *sdev)
|
|
{
|
|
struct uas_dev_info *devinfo = sdev->hostdata;
|
|
scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
|
|
scsi_activate_tcq(sdev, devinfo->qdepth - 3);
|
|
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_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,
|
|
.sg_tablesize = SG_NONE,
|
|
.cmd_per_lun = 1, /* until we override it */
|
|
.skip_settle_delay = 1,
|
|
.ordered_tag = 1,
|
|
};
|
|
|
|
static struct usb_device_id uas_usb_ids[] = {
|
|
{ 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) },
|
|
/* 0xaa is a prototype device I happen to have access to */
|
|
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, uas_usb_ids);
|
|
|
|
static int uas_is_interface(struct usb_host_interface *intf)
|
|
{
|
|
return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE &&
|
|
intf->desc.bInterfaceSubClass == USB_SC_SCSI &&
|
|
intf->desc.bInterfaceProtocol == USB_PR_UAS);
|
|
}
|
|
|
|
static int uas_isnt_supported(struct usb_device *udev)
|
|
{
|
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
|
|
|
|
dev_warn(&udev->dev, "The driver for the USB controller %s does not "
|
|
"support scatter-gather which is\n",
|
|
hcd->driver->description);
|
|
dev_warn(&udev->dev, "required by the UAS driver. Please try an"
|
|
"alternative USB controller if you wish to use UAS.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int uas_switch_interface(struct usb_device *udev,
|
|
struct usb_interface *intf)
|
|
{
|
|
int i;
|
|
int sg_supported = udev->bus->sg_tablesize != 0;
|
|
|
|
for (i = 0; i < intf->num_altsetting; i++) {
|
|
struct usb_host_interface *alt = &intf->altsetting[i];
|
|
|
|
if (uas_is_interface(alt)) {
|
|
if (!sg_supported)
|
|
return uas_isnt_supported(udev);
|
|
return usb_set_interface(udev,
|
|
alt->desc.bInterfaceNumber,
|
|
alt->desc.bAlternateSetting);
|
|
}
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void uas_configure_endpoints(struct uas_dev_info *devinfo)
|
|
{
|
|
struct usb_host_endpoint *eps[4] = { };
|
|
struct usb_interface *intf = devinfo->intf;
|
|
struct usb_device *udev = devinfo->udev;
|
|
struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint;
|
|
unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints;
|
|
|
|
devinfo->uas_sense_old = 0;
|
|
devinfo->cmnd = NULL;
|
|
|
|
for (i = 0; i < n_endpoints; i++) {
|
|
unsigned char *extra = endpoint[i].extra;
|
|
int len = endpoint[i].extralen;
|
|
while (len > 1) {
|
|
if (extra[1] == USB_DT_PIPE_USAGE) {
|
|
unsigned pipe_id = extra[2];
|
|
if (pipe_id > 0 && pipe_id < 5)
|
|
eps[pipe_id - 1] = &endpoint[i];
|
|
break;
|
|
}
|
|
len -= extra[0];
|
|
extra += extra[0];
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Assume that if we didn't find a control pipe descriptor, we're
|
|
* using a device with old firmware that happens to be set up like
|
|
* this.
|
|
*/
|
|
if (!eps[0]) {
|
|
devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1);
|
|
devinfo->status_pipe = usb_rcvbulkpipe(udev, 1);
|
|
devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2);
|
|
devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2);
|
|
|
|
eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe);
|
|
eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
|
|
eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
|
|
} else {
|
|
devinfo->cmd_pipe = usb_sndbulkpipe(udev,
|
|
eps[0]->desc.bEndpointAddress);
|
|
devinfo->status_pipe = usb_rcvbulkpipe(udev,
|
|
eps[1]->desc.bEndpointAddress);
|
|
devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
|
|
eps[2]->desc.bEndpointAddress);
|
|
devinfo->data_out_pipe = usb_sndbulkpipe(udev,
|
|
eps[3]->desc.bEndpointAddress);
|
|
}
|
|
|
|
devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256,
|
|
GFP_KERNEL);
|
|
if (devinfo->qdepth < 0) {
|
|
devinfo->qdepth = 256;
|
|
devinfo->use_streams = 0;
|
|
} else {
|
|
devinfo->use_streams = 1;
|
|
}
|
|
}
|
|
|
|
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_KERNEL);
|
|
}
|
|
|
|
/*
|
|
* XXX: What I'd like to do here is register a SCSI host for each USB host in
|
|
* the system. Follow usb-storage's design of registering a SCSI host for
|
|
* each USB device for the moment. Can implement this by walking up the
|
|
* USB hierarchy until we find a USB host.
|
|
*/
|
|
static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
|
|
{
|
|
int result;
|
|
struct Scsi_Host *shost;
|
|
struct uas_dev_info *devinfo;
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
|
|
if (uas_switch_interface(udev, intf))
|
|
return -ENODEV;
|
|
|
|
devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL);
|
|
if (!devinfo)
|
|
return -ENOMEM;
|
|
|
|
result = -ENOMEM;
|
|
shost = scsi_host_alloc(&uas_host_template, sizeof(void *));
|
|
if (!shost)
|
|
goto free;
|
|
|
|
shost->max_cmd_len = 16 + 252;
|
|
shost->max_id = 1;
|
|
shost->sg_tablesize = udev->bus->sg_tablesize;
|
|
|
|
devinfo->intf = intf;
|
|
devinfo->udev = udev;
|
|
devinfo->resetting = 0;
|
|
init_usb_anchor(&devinfo->cmd_urbs);
|
|
init_usb_anchor(&devinfo->sense_urbs);
|
|
init_usb_anchor(&devinfo->data_urbs);
|
|
spin_lock_init(&devinfo->lock);
|
|
uas_configure_endpoints(devinfo);
|
|
|
|
result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 3);
|
|
if (result)
|
|
goto free;
|
|
|
|
result = scsi_add_host(shost, &intf->dev);
|
|
if (result)
|
|
goto deconfig_eps;
|
|
|
|
shost->hostdata[0] = (unsigned long)devinfo;
|
|
|
|
scsi_scan_host(shost);
|
|
usb_set_intfdata(intf, shost);
|
|
return result;
|
|
|
|
deconfig_eps:
|
|
uas_free_streams(devinfo);
|
|
free:
|
|
kfree(devinfo);
|
|
if (shost)
|
|
scsi_host_put(shost);
|
|
return result;
|
|
}
|
|
|
|
static int uas_pre_reset(struct usb_interface *intf)
|
|
{
|
|
/* XXX: Need to return 1 if it's not our device in error handling */
|
|
return 0;
|
|
}
|
|
|
|
static int uas_post_reset(struct usb_interface *intf)
|
|
{
|
|
/* XXX: Need to return 1 if it's not our device in error handling */
|
|
return 0;
|
|
}
|
|
|
|
static void uas_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
|
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
|
|
|
|
scsi_remove_host(shost);
|
|
usb_kill_anchored_urbs(&devinfo->cmd_urbs);
|
|
usb_kill_anchored_urbs(&devinfo->sense_urbs);
|
|
usb_kill_anchored_urbs(&devinfo->data_urbs);
|
|
uas_free_streams(devinfo);
|
|
kfree(devinfo);
|
|
}
|
|
|
|
/*
|
|
* XXX: Should this plug into libusual so we can auto-upgrade devices from
|
|
* Bulk-Only to UAS?
|
|
*/
|
|
static struct usb_driver uas_driver = {
|
|
.name = "uas",
|
|
.probe = uas_probe,
|
|
.disconnect = uas_disconnect,
|
|
.pre_reset = uas_pre_reset,
|
|
.post_reset = uas_post_reset,
|
|
.id_table = uas_usb_ids,
|
|
};
|
|
|
|
module_usb_driver(uas_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp");
|