| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Hans de Goede | 2360 | 38.98% | 56 | 49.56% |
| Matthew Wilcox | 1909 | 31.53% | 4 | 3.54% |
| Gerd Hoffmann | 1253 | 20.70% | 22 | 19.47% |
| Oliver Neukum | 265 | 4.38% | 10 | 8.85% |
| Sebastian Andrzej Siewior | 143 | 2.36% | 4 | 3.54% |
| Sage Sharp | 30 | 0.50% | 2 | 1.77% |
| Alexander Kappner | 29 | 0.48% | 1 | 0.88% |
| Dmitry Katsubo | 15 | 0.25% | 1 | 0.88% |
| Christoph Hellwig | 14 | 0.23% | 3 | 2.65% |
| Alan Stern | 11 | 0.18% | 1 | 0.88% |
| Bart Van Assche | 10 | 0.17% | 1 | 0.88% |
| Greg Kroah-Hartman | 4 | 0.07% | 3 | 2.65% |
| Paul Gortmaker | 3 | 0.05% | 1 | 0.88% |
| Sanjeev Sharma | 3 | 0.05% | 1 | 0.88% |
| Hannes Reinecke | 3 | 0.05% | 1 | 0.88% |
| Jeff Garzik | 1 | 0.02% | 1 | 0.88% |
| Gustavo A. R. Silva | 1 | 0.02% | 1 | 0.88% |
| Total | 6054 | 113 |
// SPDX-License-Identifier: GPL-2.0 /* * USB Attached SCSI * Note that this is not the same as the USB Mass Storage driver * * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2016 * Copyright Matthew Wilcox for Intel Corp, 2010 * Copyright Sarah Sharp for Intel Corp, 2010 */ #include <linux/blkdev.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/module.h> #include <linux/usb.h> #include <linux/usb_usual.h> #include <linux/usb/hcd.h> #include <linux/usb/storage.h> #include <linux/usb/uas.h> #include <scsi/scsi.h> #include <scsi/scsi_eh.h> #include <scsi/scsi_dbg.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_device.h> #include <scsi/scsi_host.h> #include <scsi/scsi_tcq.h> #include "uas-detect.h" #include "scsiglue.h" #define MAX_CMNDS 256 struct uas_dev_info { struct usb_interface *intf; struct usb_device *udev; struct usb_anchor cmd_urbs; struct usb_anchor sense_urbs; struct usb_anchor data_urbs; unsigned long flags; int qdepth, resetting; unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe; unsigned use_streams:1; unsigned shutdown:1; struct scsi_cmnd *cmnd[MAX_CMNDS]; spinlock_t lock; struct work_struct work; }; enum { SUBMIT_STATUS_URB = BIT(1), ALLOC_DATA_IN_URB = BIT(2), SUBMIT_DATA_IN_URB = BIT(3), ALLOC_DATA_OUT_URB = BIT(4), SUBMIT_DATA_OUT_URB = BIT(5), ALLOC_CMD_URB = BIT(6), SUBMIT_CMD_URB = BIT(7), COMMAND_INFLIGHT = BIT(8), DATA_IN_URB_INFLIGHT = BIT(9), DATA_OUT_URB_INFLIGHT = BIT(10), COMMAND_ABORTED = BIT(11), IS_IN_WORK_LIST = BIT(12), }; /* Overrides scsi_pointer */ struct uas_cmd_info { unsigned int state; unsigned int uas_tag; struct urb *cmd_urb; struct urb *data_in_urb; struct urb *data_out_urb; }; /* I hate forward declarations, but I actually have a loop */ static int uas_submit_urbs(struct scsi_cmnd *cmnd, struct uas_dev_info *devinfo); static void uas_do_work(struct work_struct *work); static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller); static void uas_free_streams(struct uas_dev_info *devinfo); static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix, int status); static void uas_do_work(struct work_struct *work) { struct uas_dev_info *devinfo = container_of(work, struct uas_dev_info, work); struct uas_cmd_info *cmdinfo; struct scsi_cmnd *cmnd; unsigned long flags; int i, err; spin_lock_irqsave(&devinfo->lock, flags); if (devinfo->resetting) goto out; for (i = 0; i < devinfo->qdepth; i++) { if (!devinfo->cmnd[i]) continue; cmnd = devinfo->cmnd[i]; cmdinfo = (void *)&cmnd->SCp; if (!(cmdinfo->state & IS_IN_WORK_LIST)) continue; err = uas_submit_urbs(cmnd, cmnd->device->hostdata); if (!err) cmdinfo->state &= ~IS_IN_WORK_LIST; else schedule_work(&devinfo->work); } out: spin_unlock_irqrestore(&devinfo->lock, flags); } static void uas_add_work(struct uas_cmd_info *cmdinfo) { struct scsi_pointer *scp = (void *)cmdinfo; struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp); struct uas_dev_info *devinfo = cmnd->device->hostdata; lockdep_assert_held(&devinfo->lock); cmdinfo->state |= IS_IN_WORK_LIST; schedule_work(&devinfo->work); } static void uas_zap_pending(struct uas_dev_info *devinfo, int result) { struct uas_cmd_info *cmdinfo; struct scsi_cmnd *cmnd; unsigned long flags; int i, err; spin_lock_irqsave(&devinfo->lock, flags); for (i = 0; i < devinfo->qdepth; i++) { if (!devinfo->cmnd[i]) continue; cmnd = devinfo->cmnd[i]; cmdinfo = (void *)&cmnd->SCp; uas_log_cmd_state(cmnd, __func__, 0); /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */ cmdinfo->state &= ~COMMAND_INFLIGHT; cmnd->result = result << 16; err = uas_try_complete(cmnd, __func__); WARN_ON(err != 0); } spin_unlock_irqrestore(&devinfo->lock, flags); } static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd) { struct sense_iu *sense_iu = urb->transfer_buffer; struct scsi_device *sdev = cmnd->device; if (urb->actual_length > 16) { unsigned len = be16_to_cpup(&sense_iu->len); if (len + 16 != urb->actual_length) { int newlen = min(len + 16, urb->actual_length) - 16; if (newlen < 0) newlen = 0; sdev_printk(KERN_INFO, sdev, "%s: urb length %d " "disagrees with IU sense data length %d, " "using %d bytes of sense data\n", __func__, urb->actual_length, len, newlen); len = newlen; } memcpy(cmnd->sense_buffer, sense_iu->sense, len); } cmnd->result = sense_iu->status; } static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix, int status) { struct uas_cmd_info *ci = (void *)&cmnd->SCp; struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; scmd_printk(KERN_INFO, cmnd, "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ", prefix, status, cmdinfo->uas_tag, (ci->state & SUBMIT_STATUS_URB) ? " s-st" : "", (ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "", (ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "", (ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "", (ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "", (ci->state & ALLOC_CMD_URB) ? " a-cmd" : "", (ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "", (ci->state & COMMAND_INFLIGHT) ? " CMD" : "", (ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "", (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "", (ci->state & COMMAND_ABORTED) ? " abort" : "", (ci->state & IS_IN_WORK_LIST) ? " work" : ""); scsi_print_command(cmnd); } static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd) { struct uas_cmd_info *cmdinfo; if (!cmnd) return; cmdinfo = (void *)&cmnd->SCp; if (cmdinfo->state & SUBMIT_CMD_URB) usb_free_urb(cmdinfo->cmd_urb); /* data urbs may have never gotten their submit flag set */ if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT)) usb_free_urb(cmdinfo->data_in_urb); if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT)) usb_free_urb(cmdinfo->data_out_urb); } static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller) { struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; lockdep_assert_held(&devinfo->lock); if (cmdinfo->state & (COMMAND_INFLIGHT | DATA_IN_URB_INFLIGHT | DATA_OUT_URB_INFLIGHT | COMMAND_ABORTED)) return -EBUSY; devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL; uas_free_unsubmitted_urbs(cmnd); cmnd->scsi_done(cmnd); return 0; } static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd, unsigned direction) { struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; int err; cmdinfo->state |= direction | SUBMIT_STATUS_URB; err = uas_submit_urbs(cmnd, cmnd->device->hostdata); if (err) { uas_add_work(cmdinfo); } } static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd) { u8 response_code = riu->response_code; switch (response_code) { case RC_INCORRECT_LUN: cmnd->result = DID_BAD_TARGET << 16; break; case RC_TMF_SUCCEEDED: cmnd->result = DID_OK << 16; break; case RC_TMF_NOT_SUPPORTED: cmnd->result = DID_TARGET_FAILURE << 16; break; default: uas_log_cmd_state(cmnd, "response iu", response_code); cmnd->result = DID_ERROR << 16; break; } return response_code == RC_TMF_SUCCEEDED; } static void uas_stat_cmplt(struct urb *urb) { struct iu *iu = urb->transfer_buffer; struct Scsi_Host *shost = urb->context; struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; struct urb *data_in_urb = NULL; struct urb *data_out_urb = NULL; struct scsi_cmnd *cmnd; struct uas_cmd_info *cmdinfo; unsigned long flags; unsigned int idx; int status = urb->status; bool success; spin_lock_irqsave(&devinfo->lock, flags); if (devinfo->resetting) goto out; if (status) { if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN) dev_err(&urb->dev->dev, "stat urb: status %d\n", status); goto out; } idx = be16_to_cpup(&iu->tag) - 1; if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) { dev_err(&urb->dev->dev, "stat urb: no pending cmd for uas-tag %d\n", idx + 1); goto out; } cmnd = devinfo->cmnd[idx]; cmdinfo = (void *)&cmnd->SCp; if (!(cmdinfo->state & COMMAND_INFLIGHT)) { uas_log_cmd_state(cmnd, "unexpected status cmplt", 0); goto out; } switch (iu->iu_id) { case IU_ID_STATUS: uas_sense(urb, cmnd); if (cmnd->result != 0) { /* cancel data transfers on error */ data_in_urb = usb_get_urb(cmdinfo->data_in_urb); data_out_urb = usb_get_urb(cmdinfo->data_out_urb); } cmdinfo->state &= ~COMMAND_INFLIGHT; uas_try_complete(cmnd, __func__); break; case IU_ID_READ_READY: if (!cmdinfo->data_in_urb || (cmdinfo->state & DATA_IN_URB_INFLIGHT)) { uas_log_cmd_state(cmnd, "unexpected read rdy", 0); break; } uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB); break; case IU_ID_WRITE_READY: if (!cmdinfo->data_out_urb || (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) { uas_log_cmd_state(cmnd, "unexpected write rdy", 0); break; } uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB); break; case IU_ID_RESPONSE: cmdinfo->state &= ~COMMAND_INFLIGHT; success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd); if (!success) { /* Error, cancel data transfers */ data_in_urb = usb_get_urb(cmdinfo->data_in_urb); data_out_urb = usb_get_urb(cmdinfo->data_out_urb); } uas_try_complete(cmnd, __func__); break; default: uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id); } out: usb_free_urb(urb); spin_unlock_irqrestore(&devinfo->lock, flags); /* Unlinking of data urbs must be done without holding the lock */ if (data_in_urb) { usb_unlink_urb(data_in_urb); usb_put_urb(data_in_urb); } if (data_out_urb) { usb_unlink_urb(data_out_urb); usb_put_urb(data_out_urb); } } static void uas_data_cmplt(struct urb *urb) { struct scsi_cmnd *cmnd = urb->context; struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; struct scsi_data_buffer *sdb = &cmnd->sdb; unsigned long flags; int status = urb->status; spin_lock_irqsave(&devinfo->lock, flags); if (cmdinfo->data_in_urb == urb) { cmdinfo->state &= ~DATA_IN_URB_INFLIGHT; cmdinfo->data_in_urb = NULL; } else if (cmdinfo->data_out_urb == urb) { cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT; cmdinfo->data_out_urb = NULL; } if (devinfo->resetting) goto out; /* Data urbs should not complete before the cmd urb is submitted */ if (cmdinfo->state & SUBMIT_CMD_URB) { uas_log_cmd_state(cmnd, "unexpected data cmplt", 0); goto out; } if (status) { if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN) uas_log_cmd_state(cmnd, "data cmplt err", status); /* error: no data transfered */ scsi_set_resid(cmnd, sdb->length); } else { scsi_set_resid(cmnd, sdb->length - urb->actual_length); } uas_try_complete(cmnd, __func__); out: usb_free_urb(urb); spin_unlock_irqrestore(&devinfo->lock, flags); } static void uas_cmd_cmplt(struct urb *urb) { if (urb->status) dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status); usb_free_urb(urb); } static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp, struct scsi_cmnd *cmnd, enum dma_data_direction dir) { struct usb_device *udev = devinfo->udev; struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; struct urb *urb = usb_alloc_urb(0, gfp); struct scsi_data_buffer *sdb = &cmnd->sdb; unsigned int pipe = (dir == DMA_FROM_DEVICE) ? devinfo->data_in_pipe : devinfo->data_out_pipe; if (!urb) goto out; usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length, uas_data_cmplt, cmnd); if (devinfo->use_streams) urb->stream_id = cmdinfo->uas_tag; urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0; urb->sg = sdb->table.sgl; out: return urb; } static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp, struct scsi_cmnd *cmnd) { struct usb_device *udev = devinfo->udev; struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; struct urb *urb = usb_alloc_urb(0, gfp); struct sense_iu *iu; if (!urb) goto out; iu = kzalloc(sizeof(*iu), gfp); if (!iu) goto free; usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu), uas_stat_cmplt, cmnd->device->host); 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; /* fall through */ 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_device_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_target_alloc(struct scsi_target *starget) { struct uas_dev_info *devinfo = (struct uas_dev_info *) dev_to_shost(starget->dev.parent)->hostdata; if (devinfo->flags & US_FL_NO_REPORT_LUNS) starget->no_report_luns = 1; return 0; } static int uas_slave_alloc(struct scsi_device *sdev) { struct uas_dev_info *devinfo = (struct uas_dev_info *)sdev->host->hostdata; int maxp; sdev->hostdata = devinfo; /* * We have two requirements here. We must satisfy the requirements * of the physical HC and the demands of the protocol, as we * definitely want no additional memory allocation in this path * ruling out using bounce buffers. * * For a transmission on USB to continue we must never send * a package that is smaller than maxpacket. Hence the length of each * scatterlist element except the last must be divisible by the * Bulk maxpacket value. * If the HC does not ensure that through SG, * the upper layer must do that. We must assume nothing * about the capabilities off the HC, so we use the most * pessimistic requirement. */ maxp = usb_maxpacket(devinfo->udev, devinfo->data_in_pipe, 0); blk_queue_virt_boundary(sdev->request_queue, maxp - 1); /* * The protocol has no requirements on alignment in the strict sense. * Controllers may or may not have alignment restrictions. * As this is not exported, we use an extremely conservative guess. */ 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; /* UAS also needs to support FL_ALWAYS_SYNC */ if (devinfo->flags & US_FL_ALWAYS_SYNC) { sdev->skip_ms_page_3f = 1; sdev->skip_ms_page_8 = 1; sdev->wce_default_on = 1; } /* * Some disks return the total number of blocks in response * to READ CAPACITY rather than the highest block number. * If this device makes that mistake, tell the sd driver. */ if (devinfo->flags & US_FL_FIX_CAPACITY) sdev->fix_capacity = 1; /* * Some devices don't like MODE SENSE with page=0x3f, * which is the command used for checking if a device * is write-protected. Now that we tell the sd driver * to do a 192-byte transfer with this command the * majority of devices work fine, but a few still can't * handle it. The sd driver will simply assume those * devices are write-enabled. */ if (devinfo->flags & US_FL_NO_WP_DETECT) sdev->skip_ms_page_3f = 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, .target_alloc = uas_target_alloc, .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, .this_id = -1, .sg_tablesize = SG_NONE, .skip_settle_delay = 1, .dma_boundary = PAGE_SIZE - 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) { struct usb_host_interface *alt; alt = uas_find_uas_alt_setting(intf); if (!alt) return -ENODEV; return usb_set_interface(udev, alt->desc.bInterfaceNumber, alt->desc.bAlternateSetting); } 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; /* * 1 tag is reserved for untagged commands + * 1 tag to avoid off by one errors in some bridge firmwares */ shost->can_queue = devinfo->qdepth - 2; 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 && err != -ENODEV) shost_printk(KERN_ERR, shost, "%s: alloc streams error %d after reset", __func__, err); /* we must unblock the host in every case lest we deadlock */ 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 err ? 1 : 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");
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