- 根目录:
- drivers
- usb
- storage
- uas.c
/*
* 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 - 2014
* Copyright Matthew Wilcox for Intel Corp, 2010
* Copyright Sarah Sharp for Intel Corp, 2010
*
* Distributed under the terms of the GNU GPL, version two.
*/
#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 = (1 << 1),
ALLOC_DATA_IN_URB = (1 << 2),
SUBMIT_DATA_IN_URB = (1 << 3),
ALLOC_DATA_OUT_URB = (1 << 4),
SUBMIT_DATA_OUT_URB = (1 << 5),
ALLOC_CMD_URB = (1 << 6),
SUBMIT_CMD_URB = (1 << 7),
COMMAND_INFLIGHT = (1 << 8),
DATA_IN_URB_INFLIGHT = (1 << 9),
DATA_OUT_URB_INFLIGHT = (1 << 10),
COMMAND_ABORTED = (1 << 11),
IS_IN_WORK_LIST = (1 << 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, gfp_t gfp);
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, GFP_ATOMIC);
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, GFP_ATOMIC);
if (err) {
uas_add_work(cmdinfo);
}
}
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;
spin_lock_irqsave(&devinfo->lock, flags);
if (devinfo->resetting)
goto out;
if (urb->status) {
if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
dev_err(&urb->dev->dev, "stat urb: status %d\n",
urb->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:
uas_log_cmd_state(cmnd, "unexpected response iu",
((struct response_iu *)iu)->response_code);
/* Error, cancel data transfers */
data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
cmdinfo->state &= ~COMMAND_INFLIGHT;
cmnd->result = DID_ERROR << 16;
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 = NULL;
unsigned long flags;
spin_lock_irqsave(&devinfo->lock, flags);
if (cmdinfo->data_in_urb == urb) {
sdb = scsi_in(cmnd);
cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
cmdinfo->data_in_urb = NULL;
} else if (cmdinfo->data_out_urb == urb) {
sdb = scsi_out(cmnd);
cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
cmdinfo->data_out_urb = NULL;
}
if (sdb == NULL) {
WARN_ON_ONCE(1);
goto out;
}
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 (urb->status) {
if (urb->status != -ENOENT && urb->status != -ECONNRESET)
uas_log_cmd_state(cmnd, "data cmplt err", urb->status);
/* error: no data transfered */
sdb->resid = sdb->length;
} else {
sdb->resid = 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 = (dir == DMA_FROM_DEVICE)
? scsi_in(cmnd) : scsi_out(cmnd);
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, gfp_t gfp)
{
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);
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,
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);
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,
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);
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, 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);
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, 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;
}
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;
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,
.cmd_per_lun = 1, /* until we override it */
.skip_settle_delay = 1,
.use_blk_tags = 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;
result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 2);
if (result)
goto free_streams;
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");