* and is not licensed separately. See file COPYING for details.
*
* TODO (sorted by decreasing priority)
- * -- Kill first_open (Al Viro fixed the block layer now)
- * -- Do resets with usb_device_reset (needs a thread context, use khubd)
* -- set readonly flag for CDs, set removable flag for CF readers
* -- do inquiry and verify we got a disk and not a tape (for LUN mismatch)
* -- special case some senses, e.g. 3a/0 -> no media present, reduce retries
* -- verify the 13 conditions and do bulk resets
* -- kill last_pipe and simply do two-state clearing on both pipes
- * -- verify protocol (bulk) from USB descriptors (maybe...)
- * -- highmem and sg
+ * -- highmem
* -- move top_sense and work_bcs into separate allocations (if they survive)
* for cache purists and esoteric architectures.
+ * -- Allocate structure for LUN 0 before the first ub_sync_tur, avoid NULL. ?
* -- prune comments, they are too volumnous
* -- Exterminate P3 printks
* -- Resove XXX's
* -- Redo "benh's retries", perhaps have spin-up code to handle them. V:D=?
+ * -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
+#include <linux/usb_usual.h>
#include <linux/blkdev.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/timer.h>
#define UB_MAJOR 180
/*
- * Definitions which have to be scattered once we understand the layout better.
+ * The command state machine is the key model for understanding of this driver.
+ *
+ * The general rule is that all transitions are done towards the bottom
+ * of the diagram, thus preventing any loops.
+ *
+ * An exception to that is how the STAT state is handled. A counter allows it
+ * to be re-entered along the path marked with [C].
+ *
+ * +--------+
+ * ! INIT !
+ * +--------+
+ * !
+ * ub_scsi_cmd_start fails ->--------------------------------------\
+ * ! !
+ * V !
+ * +--------+ !
+ * ! CMD ! !
+ * +--------+ !
+ * ! +--------+ !
+ * was -EPIPE -->-------------------------------->! CLEAR ! !
+ * ! +--------+ !
+ * ! ! !
+ * was error -->------------------------------------- ! --------->\
+ * ! ! !
+ * /--<-- cmd->dir == NONE ? ! !
+ * ! ! ! !
+ * ! V ! !
+ * ! +--------+ ! !
+ * ! ! DATA ! ! !
+ * ! +--------+ ! !
+ * ! ! +---------+ ! !
+ * ! was -EPIPE -->--------------->! CLR2STS ! ! !
+ * ! ! +---------+ ! !
+ * ! ! ! ! !
+ * ! ! was error -->---- ! --------->\
+ * ! was error -->--------------------- ! ------------- ! --------->\
+ * ! ! ! ! !
+ * ! V ! ! !
+ * \--->+--------+ ! ! !
+ * ! STAT !<--------------------------/ ! !
+ * /--->+--------+ ! !
+ * ! ! ! !
+ * [C] was -EPIPE -->-----------\ ! !
+ * ! ! ! ! !
+ * +<---- len == 0 ! ! !
+ * ! ! ! ! !
+ * ! was error -->--------------------------------------!---------->\
+ * ! ! ! ! !
+ * +<---- bad CSW ! ! !
+ * +<---- bad tag ! ! !
+ * ! ! V ! !
+ * ! ! +--------+ ! !
+ * ! ! ! CLRRS ! ! !
+ * ! ! +--------+ ! !
+ * ! ! ! ! !
+ * \------- ! --------------------[C]--------\ ! !
+ * ! ! ! !
+ * cmd->error---\ +--------+ ! !
+ * ! +--------------->! SENSE !<----------/ !
+ * STAT_FAIL----/ +--------+ !
+ * ! ! V
+ * ! V +--------+
+ * \--------------------------------\--------------------->! DONE !
+ * +--------+
*/
-/* Transport (despite PR in the name) */
-#define US_PR_BULK 0x50 /* bulk only */
-
-/* Protocol */
-#define US_SC_SCSI 0x06 /* Transparent */
-
/*
* This many LUNs per USB device.
* Every one of them takes a host, see UB_MAX_HOSTS.
/*
*/
-#define UB_MINORS_PER_MAJOR 8
+#define UB_PARTS_PER_LUN 8
#define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */
#define US_BULK_CS_WRAP_LEN 13
#define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */
-/* This is for Olympus Camedia digital cameras */
-#define US_BULK_CS_OLYMPUS_SIGN 0x55425355 /* spells out 'USBU' */
#define US_BULK_STAT_OK 0
#define US_BULK_STAT_FAIL 1
#define US_BULK_STAT_PHASE 2
*/
struct ub_dev;
-#define UB_MAX_REQ_SG 1
+#define UB_MAX_REQ_SG 9 /* cdrecord requires 32KB and maybe a header */
#define UB_MAX_SECTORS 64
/*
#define UB_DIR_ILLEGAL2 2
#define UB_DIR_WRITE 3
+/* P3 */
#define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \
(((c)==UB_DIR_READ)? 'r': 'n'))
UB_CMDST_CLR2STS, /* Clearing before requesting status */
UB_CMDST_STAT, /* Status phase */
UB_CMDST_CLEAR, /* Clearing a stall (halt, actually) */
+ UB_CMDST_CLRRS, /* Clearing before retrying status */
UB_CMDST_SENSE, /* Sending Request Sense */
UB_CMDST_DONE /* Final state */
};
-static char *ub_scsi_cmd_stname[] = {
- ". ",
- "Cmd",
- "dat",
- "c2s",
- "sts",
- "clr",
- "Sen",
- "fin"
-};
-
struct ub_scsi_cmd {
unsigned char cdb[UB_MAX_CDB_SIZE];
unsigned char cdb_len;
unsigned char dir; /* 0 - none, 1 - read, 3 - write. */
- unsigned char trace_index;
enum ub_scsi_cmd_state state;
unsigned int tag;
struct ub_scsi_cmd *next;
int stat_count; /* Retries getting status. */
- /*
- * We do not support transfers from highmem pages
- * because the underlying USB framework does not do what we need.
- */
- char *data; /* Requested buffer */
unsigned int len; /* Requested length */
- // struct scatterlist sgv[UB_MAX_REQ_SG];
+ unsigned int current_sg;
+ unsigned int nsg; /* sgv[nsg] */
+ struct scatterlist sgv[UB_MAX_REQ_SG];
struct ub_lun *lun;
void (*done)(struct ub_dev *, struct ub_scsi_cmd *);
void *back;
};
+struct ub_request {
+ struct request *rq;
+ unsigned int current_try;
+ unsigned int nsg; /* sgv[nsg] */
+ struct scatterlist sgv[UB_MAX_REQ_SG];
+};
+
/*
*/
struct ub_capacity {
unsigned int bshift; /* Shift between 512 and hard sects */
};
-/*
- * The SCSI command tracing structure.
- */
-
-#define SCMD_ST_HIST_SZ 8
-#define SCMD_TRACE_SZ 63 /* Less than 4KB of 61-byte lines */
-
-struct ub_scsi_cmd_trace {
- int hcur;
- unsigned int tag;
- unsigned int req_size, act_size;
- unsigned char op;
- unsigned char dir;
- unsigned char key, asc, ascq;
- char st_hst[SCMD_ST_HIST_SZ];
-};
-
-struct ub_scsi_trace {
- int cur;
- struct ub_scsi_cmd_trace vec[SCMD_TRACE_SZ];
-};
-
/*
* This is a direct take-off from linux/include/completion.h
* The difference is that I do not wait on this thing, just poll.
int changed; /* Media was changed */
int removable;
int readonly;
- int first_open; /* Kludge. See ub_bd_open. */
+
+ struct ub_request urq;
/* Use Ingo's mempool if or when we have more than one command. */
/*
* The USB device instance.
*/
struct ub_dev {
- spinlock_t lock;
+ spinlock_t *lock;
atomic_t poison; /* The USB device is disconnected */
int openc; /* protected by ub_lock! */
/* kref is too implicit for our taste */
+ int reset; /* Reset is running */
unsigned int tagcnt;
char name[12];
struct usb_device *dev;
struct urb work_urb;
struct timer_list work_timer;
int last_pipe; /* What might need clearing */
+ __le32 signature; /* Learned signature */
struct bulk_cb_wrap work_bcb;
struct bulk_cs_wrap work_bcs;
struct usb_ctrlrequest work_cr;
- struct ub_scsi_trace tr;
+ struct work_struct reset_work;
+ wait_queue_head_t reset_wait;
+
+ int sg_stat[6];
};
/*
*/
static void ub_cleanup(struct ub_dev *sc);
-static int ub_bd_rq_fn_1(struct ub_lun *lun, struct request *rq);
-static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
- struct ub_scsi_cmd *cmd, struct request *rq);
-static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
- struct request *rq);
+static int ub_request_fn_1(struct ub_lun *lun, struct request *rq);
+static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_scsi_cmd *cmd, struct ub_request *urq);
+static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_scsi_cmd *cmd, struct ub_request *urq);
static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
static void ub_end_rq(struct request *rq, int uptodate);
+static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_request *urq, struct ub_scsi_cmd *cmd);
static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
static void ub_urb_complete(struct urb *urb, struct pt_regs *pt);
static void ub_scsi_action(unsigned long _dev);
static void ub_scsi_dispatch(struct ub_dev *sc);
static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
+static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc);
-static void __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
+static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
+static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
int stalled_pipe);
static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd);
+static void ub_reset_enter(struct ub_dev *sc, int try);
+static void ub_reset_task(void *arg);
static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun);
static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun,
struct ub_capacity *ret);
+static int ub_sync_reset(struct ub_dev *sc);
+static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe);
static int ub_probe_lun(struct ub_dev *sc, int lnum);
/*
*/
+#ifdef CONFIG_USB_LIBUSUAL
+
+#define ub_usb_ids storage_usb_ids
+#else
+
static struct usb_device_id ub_usb_ids[] = {
- // { USB_DEVICE_VER(0x0781, 0x0002, 0x0009, 0x0009) }, /* SDDR-31 */
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) },
{ }
};
MODULE_DEVICE_TABLE(usb, ub_usb_ids);
+#endif /* CONFIG_USB_LIBUSUAL */
/*
* Find me a way to identify "next free minor" for add_disk(),
#define UB_MAX_HOSTS 26
static char ub_hostv[UB_MAX_HOSTS];
-static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */
+#define UB_QLOCK_NUM 5
+static spinlock_t ub_qlockv[UB_QLOCK_NUM];
+static int ub_qlock_next = 0;
-/*
- * The SCSI command tracing procedures.
- */
-
-static void ub_cmdtr_new(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
-{
- int n;
- struct ub_scsi_cmd_trace *t;
-
- if ((n = sc->tr.cur + 1) == SCMD_TRACE_SZ) n = 0;
- t = &sc->tr.vec[n];
-
- memset(t, 0, sizeof(struct ub_scsi_cmd_trace));
- t->tag = cmd->tag;
- t->op = cmd->cdb[0];
- t->dir = cmd->dir;
- t->req_size = cmd->len;
- t->st_hst[0] = cmd->state;
-
- sc->tr.cur = n;
- cmd->trace_index = n;
-}
-
-static void ub_cmdtr_state(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
-{
- int n;
- struct ub_scsi_cmd_trace *t;
-
- t = &sc->tr.vec[cmd->trace_index];
- if (t->tag == cmd->tag) {
- if ((n = t->hcur + 1) == SCMD_ST_HIST_SZ) n = 0;
- t->st_hst[n] = cmd->state;
- t->hcur = n;
- }
-}
-
-static void ub_cmdtr_act_len(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
-{
- struct ub_scsi_cmd_trace *t;
-
- t = &sc->tr.vec[cmd->trace_index];
- if (t->tag == cmd->tag)
- t->act_size = cmd->act_len;
-}
-
-static void ub_cmdtr_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
- unsigned char *sense)
-{
- struct ub_scsi_cmd_trace *t;
-
- t = &sc->tr.vec[cmd->trace_index];
- if (t->tag == cmd->tag) {
- t->key = sense[2] & 0x0F;
- t->asc = sense[12];
- t->ascq = sense[13];
- }
-}
-
-static ssize_t ub_diag_show(struct device *dev, char *page)
-{
- struct usb_interface *intf;
- struct ub_dev *sc;
- struct list_head *p;
- struct ub_lun *lun;
- int cnt;
- unsigned long flags;
- int nc, nh;
- int i, j;
- struct ub_scsi_cmd_trace *t;
-
- intf = to_usb_interface(dev);
- sc = usb_get_intfdata(intf);
- if (sc == NULL)
- return 0;
-
- cnt = 0;
- spin_lock_irqsave(&sc->lock, flags);
-
- cnt += sprintf(page + cnt,
- "qlen %d qmax %d\n",
- sc->cmd_queue.qlen, sc->cmd_queue.qmax);
-
- list_for_each (p, &sc->luns) {
- lun = list_entry(p, struct ub_lun, link);
- cnt += sprintf(page + cnt,
- "lun %u changed %d removable %d readonly %d\n",
- lun->num, lun->changed, lun->removable, lun->readonly);
- }
-
- if ((nc = sc->tr.cur + 1) == SCMD_TRACE_SZ) nc = 0;
- for (j = 0; j < SCMD_TRACE_SZ; j++) {
- t = &sc->tr.vec[nc];
-
- cnt += sprintf(page + cnt, "%08x %02x", t->tag, t->op);
- if (t->op == REQUEST_SENSE) {
- cnt += sprintf(page + cnt, " [sense %x %02x %02x]",
- t->key, t->asc, t->ascq);
- } else {
- cnt += sprintf(page + cnt, " %c", UB_DIR_CHAR(t->dir));
- cnt += sprintf(page + cnt, " [%5d %5d]",
- t->req_size, t->act_size);
- }
- if ((nh = t->hcur + 1) == SCMD_ST_HIST_SZ) nh = 0;
- for (i = 0; i < SCMD_ST_HIST_SZ; i++) {
- cnt += sprintf(page + cnt, " %s",
- ub_scsi_cmd_stname[(int)t->st_hst[nh]]);
- if (++nh == SCMD_ST_HIST_SZ) nh = 0;
- }
- cnt += sprintf(page + cnt, "\n");
-
- if (++nc == SCMD_TRACE_SZ) nc = 0;
- }
-
- spin_unlock_irqrestore(&sc->lock, flags);
- return cnt;
-}
-
-static DEVICE_ATTR(diag, S_IRUGO, ub_diag_show, NULL); /* N.B. World readable */
+static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */
/*
* The id allocator.
spin_unlock_irqrestore(&ub_lock, flags);
}
+/*
+ * This is necessitated by the fact that blk_cleanup_queue does not
+ * necesserily destroy the queue. Instead, it may merely decrease q->refcnt.
+ * Since our blk_init_queue() passes a spinlock common with ub_dev,
+ * we have life time issues when ub_cleanup frees ub_dev.
+ */
+static spinlock_t *ub_next_lock(void)
+{
+ unsigned long flags;
+ spinlock_t *ret;
+
+ spin_lock_irqsave(&ub_lock, flags);
+ ret = &ub_qlockv[ub_qlock_next];
+ ub_qlock_next = (ub_qlock_next + 1) % UB_QLOCK_NUM;
+ spin_unlock_irqrestore(&ub_lock, flags);
+ return ret;
+}
+
/*
* Downcount for deallocation. This rides on two assumptions:
* - once something is poisoned, its refcount cannot grow
kfree(lun);
}
+ usb_set_intfdata(sc->intf, NULL);
+ usb_put_intf(sc->intf);
+ usb_put_dev(sc->dev);
kfree(sc);
}
* The request function is our main entry point
*/
-static void ub_bd_rq_fn(request_queue_t *q)
+static void ub_request_fn(request_queue_t *q)
{
struct ub_lun *lun = q->queuedata;
struct request *rq;
while ((rq = elv_next_request(q)) != NULL) {
- if (ub_bd_rq_fn_1(lun, rq) != 0) {
+ if (ub_request_fn_1(lun, rq) != 0) {
blk_stop_queue(q);
break;
}
}
}
-static int ub_bd_rq_fn_1(struct ub_lun *lun, struct request *rq)
+static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
{
struct ub_dev *sc = lun->udev;
struct ub_scsi_cmd *cmd;
- int rc;
+ struct ub_request *urq;
+ int n_elem;
if (atomic_read(&sc->poison) || lun->changed) {
blkdev_dequeue_request(rq);
return 0;
}
+ if (lun->urq.rq != NULL)
+ return -1;
if ((cmd = ub_get_cmd(lun)) == NULL)
return -1;
memset(cmd, 0, sizeof(struct ub_scsi_cmd));
blkdev_dequeue_request(rq);
+ urq = &lun->urq;
+ memset(urq, 0, sizeof(struct ub_request));
+ urq->rq = rq;
+
+ /*
+ * get scatterlist from block layer
+ */
+ n_elem = blk_rq_map_sg(lun->disk->queue, rq, &urq->sgv[0]);
+ if (n_elem < 0) {
+ printk(KERN_INFO "%s: failed request map (%d)\n",
+ lun->name, n_elem); /* P3 */
+ goto drop;
+ }
+ if (n_elem > UB_MAX_REQ_SG) { /* Paranoia */
+ printk(KERN_WARNING "%s: request with %d segments\n",
+ lun->name, n_elem);
+ goto drop;
+ }
+ urq->nsg = n_elem;
+ sc->sg_stat[n_elem < 5 ? n_elem : 5]++;
+
if (blk_pc_request(rq)) {
- rc = ub_cmd_build_packet(sc, cmd, rq);
+ ub_cmd_build_packet(sc, lun, cmd, urq);
} else {
- rc = ub_cmd_build_block(sc, lun, cmd, rq);
- }
- if (rc != 0) {
- ub_put_cmd(lun, cmd);
- ub_end_rq(rq, 0);
- return 0;
+ ub_cmd_build_block(sc, lun, cmd, urq);
}
cmd->state = UB_CMDST_INIT;
cmd->lun = lun;
cmd->done = ub_rw_cmd_done;
- cmd->back = rq;
+ cmd->back = urq;
cmd->tag = sc->tagcnt++;
- if ((rc = ub_submit_scsi(sc, cmd)) != 0) {
- ub_put_cmd(lun, cmd);
- ub_end_rq(rq, 0);
- return 0;
- }
+ if (ub_submit_scsi(sc, cmd) != 0)
+ goto drop;
return 0;
+
+drop:
+ ub_put_cmd(lun, cmd);
+ ub_end_rq(rq, 0);
+ return 0;
}
-static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
- struct ub_scsi_cmd *cmd, struct request *rq)
+static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_scsi_cmd *cmd, struct ub_request *urq)
{
- int ub_dir;
-#if 0 /* We use rq->buffer for now */
- struct scatterlist *sg;
- int n_elem;
-#endif
+ struct request *rq = urq->rq;
unsigned int block, nblks;
if (rq_data_dir(rq) == WRITE)
- ub_dir = UB_DIR_WRITE;
+ cmd->dir = UB_DIR_WRITE;
else
- ub_dir = UB_DIR_READ;
+ cmd->dir = UB_DIR_READ;
- /*
- * get scatterlist from block layer
- */
-#if 0 /* We use rq->buffer for now */
- sg = &cmd->sgv[0];
- n_elem = blk_rq_map_sg(q, rq, sg);
- if (n_elem <= 0) {
- ub_put_cmd(lun, cmd);
- ub_end_rq(rq, 0);
- blk_start_queue(q);
- return 0; /* request with no s/g entries? */
- }
-
- if (n_elem != 1) { /* Paranoia */
- printk(KERN_WARNING "%s: request with %d segments\n",
- sc->name, n_elem);
- ub_put_cmd(lun, cmd);
- ub_end_rq(rq, 0);
- blk_start_queue(q);
- return 0;
- }
-#endif
-
- /*
- * XXX Unfortunately, this check does not work. It is quite possible
- * to get bogus non-null rq->buffer if you allow sg by mistake.
- */
- if (rq->buffer == NULL) {
- /*
- * This must not happen if we set the queue right.
- * The block level must create bounce buffers for us.
- */
- static int do_print = 1;
- if (do_print) {
- printk(KERN_WARNING "%s: unmapped block request"
- " flags 0x%lx sectors %lu\n",
- sc->name, rq->flags, rq->nr_sectors);
- do_print = 0;
- }
- return -1;
- }
+ cmd->nsg = urq->nsg;
+ memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg);
/*
* build the command
block = rq->sector >> lun->capacity.bshift;
nblks = rq->nr_sectors >> lun->capacity.bshift;
- cmd->cdb[0] = (ub_dir == UB_DIR_READ)? READ_10: WRITE_10;
+ cmd->cdb[0] = (cmd->dir == UB_DIR_READ)? READ_10: WRITE_10;
/* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */
cmd->cdb[2] = block >> 24;
cmd->cdb[3] = block >> 16;
cmd->cdb[8] = nblks;
cmd->cdb_len = 10;
- cmd->dir = ub_dir;
- cmd->data = rq->buffer;
cmd->len = rq->nr_sectors * 512;
-
- return 0;
}
-static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
- struct request *rq)
+static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_scsi_cmd *cmd, struct ub_request *urq)
{
-
- if (rq->data_len != 0 && rq->data == NULL) {
- static int do_print = 1;
- if (do_print) {
- printk(KERN_WARNING "%s: unmapped packet request"
- " flags 0x%lx length %d\n",
- sc->name, rq->flags, rq->data_len);
- do_print = 0;
- }
- return -1;
- }
-
- memcpy(&cmd->cdb, rq->cmd, rq->cmd_len);
- cmd->cdb_len = rq->cmd_len;
+ struct request *rq = urq->rq;
if (rq->data_len == 0) {
cmd->dir = UB_DIR_NONE;
else
cmd->dir = UB_DIR_READ;
}
- cmd->data = rq->data;
- cmd->len = rq->data_len;
- return 0;
+ cmd->nsg = urq->nsg;
+ memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg);
+
+ memcpy(&cmd->cdb, rq->cmd, rq->cmd_len);
+ cmd->cdb_len = rq->cmd_len;
+
+ cmd->len = rq->data_len;
}
static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
{
- struct request *rq = cmd->back;
struct ub_lun *lun = cmd->lun;
- struct gendisk *disk = lun->disk;
- request_queue_t *q = disk->queue;
+ struct ub_request *urq = cmd->back;
+ struct request *rq;
int uptodate;
- if (blk_pc_request(rq)) {
- /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */
- memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE);
- rq->sense_len = UB_SENSE_SIZE;
- }
+ rq = urq->rq;
- if (cmd->error == 0)
+ if (cmd->error == 0) {
uptodate = 1;
- else
+
+ if (blk_pc_request(rq)) {
+ if (cmd->act_len >= rq->data_len)
+ rq->data_len = 0;
+ else
+ rq->data_len -= cmd->act_len;
+ }
+ } else {
uptodate = 0;
+ if (blk_pc_request(rq)) {
+ /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */
+ memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE);
+ rq->sense_len = UB_SENSE_SIZE;
+ if (sc->top_sense[0] != 0)
+ rq->errors = SAM_STAT_CHECK_CONDITION;
+ else
+ rq->errors = DID_ERROR << 16;
+ } else {
+ if (cmd->error == -EIO) {
+ if (ub_rw_cmd_retry(sc, lun, urq, cmd) == 0)
+ return;
+ }
+ }
+ }
+
+ urq->rq = NULL;
+
ub_put_cmd(lun, cmd);
ub_end_rq(rq, uptodate);
- blk_start_queue(q);
+ blk_start_queue(lun->disk->queue);
}
static void ub_end_rq(struct request *rq, int uptodate)
{
- int rc;
+ end_that_request_first(rq, uptodate, rq->hard_nr_sectors);
+ end_that_request_last(rq, uptodate);
+}
+
+static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_request *urq, struct ub_scsi_cmd *cmd)
+{
+
+ if (atomic_read(&sc->poison))
+ return -ENXIO;
+
+ ub_reset_enter(sc, urq->current_try);
+
+ if (urq->current_try >= 3)
+ return -EIO;
+ urq->current_try++;
+ /* P3 */ printk("%s: dir %c len/act %d/%d "
+ "[sense %x %02x %02x] retry %d\n",
+ sc->name, UB_DIR_CHAR(cmd->dir), cmd->len, cmd->act_len,
+ cmd->key, cmd->asc, cmd->ascq, urq->current_try);
- rc = end_that_request_first(rq, uptodate, rq->hard_nr_sectors);
- // assert(rc == 0);
- end_that_request_last(rq);
+ memset(cmd, 0, sizeof(struct ub_scsi_cmd));
+ ub_cmd_build_block(sc, lun, cmd, urq);
+
+ cmd->state = UB_CMDST_INIT;
+ cmd->lun = lun;
+ cmd->done = ub_rw_cmd_done;
+ cmd->back = urq;
+
+ cmd->tag = sc->tagcnt++;
+
+#if 0 /* Wasteful */
+ return ub_submit_scsi(sc, cmd);
+#else
+ ub_cmdq_add(sc, cmd);
+ return 0;
+#endif
}
/*
* No exceptions.
*
* Host is assumed locked.
- *
- * XXX We only support Bulk for the moment.
*/
static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
{
sc->last_pipe = sc->send_bulk_pipe;
usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->send_bulk_pipe,
bcb, US_BULK_CB_WRAP_LEN, ub_urb_complete, sc);
- sc->work_urb.transfer_flags = URB_ASYNC_UNLINK;
/* Fill what we shouldn't be filling, because usb-storage did so. */
sc->work_urb.actual_length = 0;
if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) {
/* XXX Clear stalls */
- printk("ub: cmd #%d start failed (%d)\n", cmd->tag, rc); /* P3 */
ub_complete(&sc->work_done);
return rc;
}
add_timer(&sc->work_timer);
cmd->state = UB_CMDST_CMD;
- ub_cmdtr_state(sc, cmd);
return 0;
}
struct ub_dev *sc = (struct ub_dev *) arg;
unsigned long flags;
- spin_lock_irqsave(&sc->lock, flags);
- usb_unlink_urb(&sc->work_urb);
- spin_unlock_irqrestore(&sc->lock, flags);
+ spin_lock_irqsave(sc->lock, flags);
+ if (!ub_is_completed(&sc->work_done))
+ usb_unlink_urb(&sc->work_urb);
+ spin_unlock_irqrestore(sc->lock, flags);
}
/*
struct ub_dev *sc = (struct ub_dev *) _dev;
unsigned long flags;
- spin_lock_irqsave(&sc->lock, flags);
- del_timer(&sc->work_timer);
+ spin_lock_irqsave(sc->lock, flags);
ub_scsi_dispatch(sc);
- spin_unlock_irqrestore(&sc->lock, flags);
+ spin_unlock_irqrestore(sc->lock, flags);
}
static void ub_scsi_dispatch(struct ub_dev *sc)
struct ub_scsi_cmd *cmd;
int rc;
- while ((cmd = ub_cmdq_peek(sc)) != NULL) {
+ while (!sc->reset && (cmd = ub_cmdq_peek(sc)) != NULL) {
if (cmd->state == UB_CMDST_DONE) {
ub_cmdq_pop(sc);
(*cmd->done)(sc, cmd);
} else if (cmd->state == UB_CMDST_INIT) {
- ub_cmdtr_new(sc, cmd);
if ((rc = ub_scsi_cmd_start(sc, cmd)) == 0)
break;
cmd->error = rc;
cmd->state = UB_CMDST_DONE;
- ub_cmdtr_state(sc, cmd);
} else {
if (!ub_is_completed(&sc->work_done))
break;
+ del_timer(&sc->work_timer);
ub_scsi_urb_compl(sc, cmd);
}
}
{
struct urb *urb = &sc->work_urb;
struct bulk_cs_wrap *bcs;
- int pipe;
+ int len;
int rc;
if (atomic_read(&sc->poison)) {
- /* A little too simplistic, I feel... */
- goto Bad_End;
+ ub_state_done(sc, cmd, -ENODEV);
+ return;
}
if (cmd->state == UB_CMDST_CLEAR) {
/*
* STALL while clearning STALL.
* The control pipe clears itself - nothing to do.
- * XXX Might try to reset the device here and retry.
*/
printk(KERN_NOTICE "%s: stall on control pipe\n",
sc->name);
} else if (cmd->state == UB_CMDST_CLR2STS) {
if (urb->status == -EPIPE) {
- /*
- * STALL while clearning STALL.
- * The control pipe clears itself - nothing to do.
- * XXX Might try to reset the device here and retry.
- */
printk(KERN_NOTICE "%s: stall on control pipe\n",
sc->name);
goto Bad_End;
ub_state_stat(sc, cmd);
- } else if (cmd->state == UB_CMDST_CMD) {
+ } else if (cmd->state == UB_CMDST_CLRRS) {
if (urb->status == -EPIPE) {
+ printk(KERN_NOTICE "%s: stall on control pipe\n",
+ sc->name);
+ goto Bad_End;
+ }
+
+ /*
+ * We ignore the result for the halt clear.
+ */
+
+ /* reset the endpoint toggle */
+ usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe),
+ usb_pipeout(sc->last_pipe), 0);
+
+ ub_state_stat_counted(sc, cmd);
+
+ } else if (cmd->state == UB_CMDST_CMD) {
+ switch (urb->status) {
+ case 0:
+ break;
+ case -EOVERFLOW:
+ goto Bad_End;
+ case -EPIPE:
rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe);
if (rc != 0) {
printk(KERN_NOTICE "%s: "
* This is typically ENOMEM or some other such shit.
* Retrying is pointless. Just do Bad End on it...
*/
- goto Bad_End;
+ ub_state_done(sc, cmd, rc);
+ return;
}
cmd->state = UB_CMDST_CLEAR;
- ub_cmdtr_state(sc, cmd);
return;
- }
- if (urb->status != 0) {
- printk("ub: cmd #%d cmd status (%d)\n", cmd->tag, urb->status); /* P3 */
+ case -ESHUTDOWN: /* unplug */
+ case -EILSEQ: /* unplug timeout on uhci */
+ ub_state_done(sc, cmd, -ENODEV);
+ return;
+ default:
goto Bad_End;
}
if (urb->actual_length != US_BULK_CB_WRAP_LEN) {
- printk("ub: cmd #%d xferred %d\n", cmd->tag, urb->actual_length); /* P3 */
- /* XXX Must do reset here to unconfuse the device */
goto Bad_End;
}
- if (cmd->dir == UB_DIR_NONE) {
+ if (cmd->dir == UB_DIR_NONE || cmd->nsg < 1) {
ub_state_stat(sc, cmd);
return;
}
- UB_INIT_COMPLETION(sc->work_done);
-
- if (cmd->dir == UB_DIR_READ)
- pipe = sc->recv_bulk_pipe;
- else
- pipe = sc->send_bulk_pipe;
- sc->last_pipe = pipe;
- usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe,
- cmd->data, cmd->len, ub_urb_complete, sc);
- sc->work_urb.transfer_flags = URB_ASYNC_UNLINK;
- sc->work_urb.actual_length = 0;
- sc->work_urb.error_count = 0;
- sc->work_urb.status = 0;
-
- if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) {
- /* XXX Clear stalls */
- printk("ub: data #%d submit failed (%d)\n", cmd->tag, rc); /* P3 */
- ub_complete(&sc->work_done);
- ub_state_done(sc, cmd, rc);
- return;
- }
-
- sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT;
- add_timer(&sc->work_timer);
-
- cmd->state = UB_CMDST_DATA;
- ub_cmdtr_state(sc, cmd);
+ // udelay(125); // usb-storage has this
+ ub_data_start(sc, cmd);
} else if (cmd->state == UB_CMDST_DATA) {
if (urb->status == -EPIPE) {
printk(KERN_NOTICE "%s: "
"unable to submit clear (%d)\n",
sc->name, rc);
- /*
- * This is typically ENOMEM or some other such shit.
- * Retrying is pointless. Just do Bad End on it...
- */
- goto Bad_End;
+ ub_state_done(sc, cmd, rc);
+ return;
}
cmd->state = UB_CMDST_CLR2STS;
- ub_cmdtr_state(sc, cmd);
return;
}
if (urb->status == -EOVERFLOW) {
* A babble? Failure, but we must transfer CSW now.
*/
cmd->error = -EOVERFLOW; /* A cheap trick... */
+ ub_state_stat(sc, cmd);
+ return;
+ }
+
+ if (cmd->dir == UB_DIR_WRITE) {
+ /*
+ * Do not continue writes in case of a failure.
+ * Doing so would cause sectors to be mixed up,
+ * which is worse than sectors lost.
+ *
+ * We must try to read the CSW, or many devices
+ * get confused.
+ */
+ len = urb->actual_length;
+ if (urb->status != 0 ||
+ len != cmd->sgv[cmd->current_sg].length) {
+ cmd->act_len += len;
+
+ cmd->error = -EIO;
+ ub_state_stat(sc, cmd);
+ return;
+ }
+
} else {
+ /*
+ * If an error occurs on read, we record it, and
+ * continue to fetch data in order to avoid bubble.
+ *
+ * As a small shortcut, we stop if we detect that
+ * a CSW mixed into data.
+ */
if (urb->status != 0)
- goto Bad_End;
+ cmd->error = -EIO;
+
+ len = urb->actual_length;
+ if (urb->status != 0 ||
+ len != cmd->sgv[cmd->current_sg].length) {
+ if ((len & 0x1FF) == US_BULK_CS_WRAP_LEN)
+ goto Bad_End;
+ }
}
- cmd->act_len = urb->actual_length;
- ub_cmdtr_act_len(sc, cmd);
+ cmd->act_len += urb->actual_length;
+ if (++cmd->current_sg < cmd->nsg) {
+ ub_data_start(sc, cmd);
+ return;
+ }
ub_state_stat(sc, cmd);
} else if (cmd->state == UB_CMDST_STAT) {
printk(KERN_NOTICE "%s: "
"unable to submit clear (%d)\n",
sc->name, rc);
- /*
- * This is typically ENOMEM or some other such shit.
- * Retrying is pointless. Just do Bad End on it...
- */
- goto Bad_End;
+ ub_state_done(sc, cmd, rc);
+ return;
}
- cmd->state = UB_CMDST_CLEAR;
- ub_cmdtr_state(sc, cmd);
+
+ /*
+ * Having a stall when getting CSW is an error, so
+ * make sure uppper levels are not oblivious to it.
+ */
+ cmd->error = -EIO; /* A cheap trick... */
+
+ cmd->state = UB_CMDST_CLRRS;
return;
}
+
+ /* Catch everything, including -EOVERFLOW and other nasties. */
if (urb->status != 0)
goto Bad_End;
if (urb->actual_length == 0) {
- /*
- * Some broken devices add unnecessary zero-length
- * packets to the end of their data transfers.
- * Such packets show up as 0-length CSWs. If we
- * encounter such a thing, try to read the CSW again.
- */
- if (++cmd->stat_count >= 4) {
- printk(KERN_NOTICE "%s: unable to get CSW\n",
- sc->name);
- goto Bad_End;
- }
- __ub_state_stat(sc, cmd);
+ ub_state_stat_counted(sc, cmd);
return;
}
/*
* Check the returned Bulk protocol status.
+ * The status block has to be validated first.
*/
bcs = &sc->work_bcs;
- rc = le32_to_cpu(bcs->Residue);
- if (rc != cmd->len - cmd->act_len) {
+
+ if (sc->signature == cpu_to_le32(0)) {
/*
- * It is all right to transfer less, the caller has
- * to check. But it's not all right if the device
- * counts disagree with our counts.
+ * This is the first reply, so do not perform the check.
+ * Instead, remember the signature the device uses
+ * for future checks. But do not allow a nul.
*/
- /* P3 */ printk("%s: resid %d len %d act %d\n",
- sc->name, rc, cmd->len, cmd->act_len);
- goto Bad_End;
- }
-
-#if 0
- if (bcs->Signature != cpu_to_le32(US_BULK_CS_SIGN) &&
- bcs->Signature != cpu_to_le32(US_BULK_CS_OLYMPUS_SIGN)) {
- /* Windows ignores signatures, so do we. */
+ sc->signature = bcs->Signature;
+ if (sc->signature == cpu_to_le32(0)) {
+ ub_state_stat_counted(sc, cmd);
+ return;
+ }
+ } else {
+ if (bcs->Signature != sc->signature) {
+ ub_state_stat_counted(sc, cmd);
+ return;
+ }
}
-#endif
if (bcs->Tag != cmd->tag) {
/*
* commands and reply at commands we timed out before.
* Without flushing these replies we loop forever.
*/
- if (++cmd->stat_count >= 4) {
- printk(KERN_NOTICE "%s: "
- "tag mismatch orig 0x%x reply 0x%x\n",
- sc->name, cmd->tag, bcs->Tag);
- goto Bad_End;
- }
- __ub_state_stat(sc, cmd);
+ ub_state_stat_counted(sc, cmd);
return;
}
+ len = le32_to_cpu(bcs->Residue);
+ if (len != cmd->len - cmd->act_len) {
+ /*
+ * It is all right to transfer less, the caller has
+ * to check. But it's not all right if the device
+ * counts disagree with our counts.
+ */
+ /* P3 */ printk("%s: resid %d len %d act %d\n",
+ sc->name, len, cmd->len, cmd->act_len);
+ goto Bad_End;
+ }
+
switch (bcs->Status) {
case US_BULK_STAT_OK:
break;
ub_state_sense(sc, cmd);
return;
case US_BULK_STAT_PHASE:
- /* XXX We must reset the transport here */
/* P3 */ printk("%s: status PHASE\n", sc->name);
goto Bad_End;
default:
printk(KERN_INFO "%s: unknown CSW status 0x%x\n",
sc->name, bcs->Status);
- goto Bad_End;
+ ub_state_done(sc, cmd, -EINVAL);
+ return;
}
/* Not zeroing error to preserve a babble indicator */
+ if (cmd->error != 0) {
+ ub_state_sense(sc, cmd);
+ return;
+ }
cmd->state = UB_CMDST_DONE;
- ub_cmdtr_state(sc, cmd);
ub_cmdq_pop(sc);
(*cmd->done)(sc, cmd);
printk(KERN_WARNING "%s: "
"wrong command state %d\n",
sc->name, cmd->state);
- goto Bad_End;
+ ub_state_done(sc, cmd, -EINVAL);
+ return;
}
return;
ub_state_done(sc, cmd, -EIO);
}
+/*
+ * Factorization helper for the command state machine:
+ * Initiate a data segment transfer.
+ */
+static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
+{
+ struct scatterlist *sg = &cmd->sgv[cmd->current_sg];
+ int pipe;
+ int rc;
+
+ UB_INIT_COMPLETION(sc->work_done);
+
+ if (cmd->dir == UB_DIR_READ)
+ pipe = sc->recv_bulk_pipe;
+ else
+ pipe = sc->send_bulk_pipe;
+ sc->last_pipe = pipe;
+ usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe,
+ page_address(sg->page) + sg->offset, sg->length,
+ ub_urb_complete, sc);
+ sc->work_urb.actual_length = 0;
+ sc->work_urb.error_count = 0;
+ sc->work_urb.status = 0;
+
+ if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) {
+ /* XXX Clear stalls */
+ ub_complete(&sc->work_done);
+ ub_state_done(sc, cmd, rc);
+ return;
+ }
+
+ sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT;
+ add_timer(&sc->work_timer);
+
+ cmd->state = UB_CMDST_DATA;
+}
+
/*
* Factorization helper for the command state machine:
* Finish the command.
cmd->error = rc;
cmd->state = UB_CMDST_DONE;
- ub_cmdtr_state(sc, cmd);
ub_cmdq_pop(sc);
(*cmd->done)(sc, cmd);
}
* Factorization helper for the command state machine:
* Submit a CSW read.
*/
-static void __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
+static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
{
int rc;
sc->last_pipe = sc->recv_bulk_pipe;
usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->recv_bulk_pipe,
&sc->work_bcs, US_BULK_CS_WRAP_LEN, ub_urb_complete, sc);
- sc->work_urb.transfer_flags = URB_ASYNC_UNLINK;
sc->work_urb.actual_length = 0;
sc->work_urb.error_count = 0;
sc->work_urb.status = 0;
/* XXX Clear stalls */
ub_complete(&sc->work_done);
ub_state_done(sc, cmd, rc);
- return;
+ return -1;
}
sc->work_timer.expires = jiffies + UB_STAT_TIMEOUT;
add_timer(&sc->work_timer);
+ return 0;
}
/*
*/
static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
{
- __ub_state_stat(sc, cmd);
+
+ if (__ub_state_stat(sc, cmd) != 0)
+ return;
cmd->stat_count = 0;
cmd->state = UB_CMDST_STAT;
- ub_cmdtr_state(sc, cmd);
+}
+
+/*
+ * Factorization helper for the command state machine:
+ * Submit a CSW read and go to STAT state with counter (along [C] path).
+ */
+static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
+{
+
+ if (++cmd->stat_count >= 4) {
+ ub_state_sense(sc, cmd);
+ return;
+ }
+
+ if (__ub_state_stat(sc, cmd) != 0)
+ return;
+
+ cmd->state = UB_CMDST_STAT;
}
/*
static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
{
struct ub_scsi_cmd *scmd;
+ struct scatterlist *sg;
int rc;
if (cmd->cdb[0] == REQUEST_SENSE) {
}
scmd = &sc->top_rqs_cmd;
+ memset(scmd, 0, sizeof(struct ub_scsi_cmd));
scmd->cdb[0] = REQUEST_SENSE;
scmd->cdb[4] = UB_SENSE_SIZE;
scmd->cdb_len = 6;
scmd->dir = UB_DIR_READ;
scmd->state = UB_CMDST_INIT;
- scmd->data = sc->top_sense;
+ scmd->nsg = 1;
+ sg = &scmd->sgv[0];
+ sg->page = virt_to_page(sc->top_sense);
+ sg->offset = (unsigned long)sc->top_sense & (PAGE_SIZE-1);
+ sg->length = UB_SENSE_SIZE;
scmd->len = UB_SENSE_SIZE;
scmd->lun = cmd->lun;
scmd->done = ub_top_sense_done;
scmd->tag = sc->tagcnt++;
cmd->state = UB_CMDST_SENSE;
- ub_cmdtr_state(sc, cmd);
ub_cmdq_insert(sc, scmd);
return;
usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe,
(unsigned char*) cr, NULL, 0, ub_urb_complete, sc);
- sc->work_urb.transfer_flags = URB_ASYNC_UNLINK;
sc->work_urb.actual_length = 0;
sc->work_urb.error_count = 0;
sc->work_urb.status = 0;
*/
static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd)
{
- unsigned char *sense = scmd->data;
+ unsigned char *sense = sc->top_sense;
struct ub_scsi_cmd *cmd;
- /*
- * Ignoring scmd->act_len, because the buffer was pre-zeroed.
- */
- ub_cmdtr_sense(sc, scmd, sense);
-
/*
* Find the command which triggered the unit attention or a check,
* save the sense into it, and advance its state machine.
return;
}
+ /*
+ * Ignoring scmd->act_len, because the buffer was pre-zeroed.
+ */
cmd->key = sense[2] & 0x0F;
cmd->asc = sense[12];
cmd->ascq = sense[13];
ub_scsi_urb_compl(sc, cmd);
}
+/*
+ * Reset management
+ * XXX Move usb_reset_device to khubd. Hogging kevent is not a good thing.
+ * XXX Make usb_sync_reset asynchronous.
+ */
+
+static void ub_reset_enter(struct ub_dev *sc, int try)
+{
+
+ if (sc->reset) {
+ /* This happens often on multi-LUN devices. */
+ return;
+ }
+ sc->reset = try + 1;
+
+#if 0 /* Not needed because the disconnect waits for us. */
+ unsigned long flags;
+ spin_lock_irqsave(&ub_lock, flags);
+ sc->openc++;
+ spin_unlock_irqrestore(&ub_lock, flags);
+#endif
+
+#if 0 /* We let them stop themselves. */
+ struct list_head *p;
+ struct ub_lun *lun;
+ list_for_each(p, &sc->luns) {
+ lun = list_entry(p, struct ub_lun, link);
+ blk_stop_queue(lun->disk->queue);
+ }
+#endif
+
+ schedule_work(&sc->reset_work);
+}
+
+static void ub_reset_task(void *arg)
+{
+ struct ub_dev *sc = arg;
+ unsigned long flags;
+ struct list_head *p;
+ struct ub_lun *lun;
+ int lkr, rc;
+
+ if (!sc->reset) {
+ printk(KERN_WARNING "%s: Running reset unrequested\n",
+ sc->name);
+ return;
+ }
+
+ if (atomic_read(&sc->poison)) {
+ printk(KERN_NOTICE "%s: Not resetting disconnected device\n",
+ sc->name); /* P3 This floods. Remove soon. XXX */
+ } else if ((sc->reset & 1) == 0) {
+ ub_sync_reset(sc);
+ msleep(700); /* usb-storage sleeps 6s (!) */
+ ub_probe_clear_stall(sc, sc->recv_bulk_pipe);
+ ub_probe_clear_stall(sc, sc->send_bulk_pipe);
+ } else if (sc->dev->actconfig->desc.bNumInterfaces != 1) {
+ printk(KERN_NOTICE "%s: Not resetting multi-interface device\n",
+ sc->name); /* P3 This floods. Remove soon. XXX */
+ } else {
+ if ((lkr = usb_lock_device_for_reset(sc->dev, sc->intf)) < 0) {
+ printk(KERN_NOTICE
+ "%s: usb_lock_device_for_reset failed (%d)\n",
+ sc->name, lkr);
+ } else {
+ rc = usb_reset_device(sc->dev);
+ if (rc < 0) {
+ printk(KERN_NOTICE "%s: "
+ "usb_lock_device_for_reset failed (%d)\n",
+ sc->name, rc);
+ }
+
+ if (lkr)
+ usb_unlock_device(sc->dev);
+ }
+ }
+
+ /*
+ * In theory, no commands can be running while reset is active,
+ * so nobody can ask for another reset, and so we do not need any
+ * queues of resets or anything. We do need a spinlock though,
+ * to interact with block layer.
+ */
+ spin_lock_irqsave(sc->lock, flags);
+ sc->reset = 0;
+ tasklet_schedule(&sc->tasklet);
+ list_for_each(p, &sc->luns) {
+ lun = list_entry(p, struct ub_lun, link);
+ blk_start_queue(lun->disk->queue);
+ }
+ wake_up(&sc->reset_wait);
+ spin_unlock_irqrestore(sc->lock, flags);
+}
+
/*
* This is called from a process context.
*/
sc->openc++;
spin_unlock_irqrestore(&ub_lock, flags);
- /*
- * This is a workaround for a specific problem in our block layer.
- * In 2.6.9, register_disk duplicates the code from rescan_partitions.
- * However, if we do add_disk with a device which persistently reports
- * a changed media, add_disk calls register_disk, which does do_open,
- * which will call rescan_paritions for changed media. After that,
- * register_disk attempts to do it all again and causes double kobject
- * registration and a eventually an oops on module removal.
- *
- * The bottom line is, Al Viro says that we should not allow
- * bdev->bd_invalidated to be set when doing add_disk no matter what.
- */
- if (lun->first_open) {
- lun->first_open = 0;
- if (lun->changed) {
- rc = -ENOMEDIUM;
- goto err_open;
- }
- }
-
if (lun->removable || lun->readonly)
check_disk_change(inode->i_bdev);
init_completion(&compl);
rc = -ENOMEM;
- if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL)
+ if ((cmd = kzalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL)
goto err_alloc;
- memset(cmd, 0, ALLOC_SIZE);
cmd->cdb[0] = TEST_UNIT_READY;
cmd->cdb_len = 6;
cmd->done = ub_probe_done;
cmd->back = &compl;
- spin_lock_irqsave(&sc->lock, flags);
+ spin_lock_irqsave(sc->lock, flags);
cmd->tag = sc->tagcnt++;
rc = ub_submit_scsi(sc, cmd);
- spin_unlock_irqrestore(&sc->lock, flags);
+ spin_unlock_irqrestore(sc->lock, flags);
if (rc != 0) {
printk("ub: testing ready: submit error (%d)\n", rc); /* P3 */
struct ub_capacity *ret)
{
struct ub_scsi_cmd *cmd;
+ struct scatterlist *sg;
char *p;
enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) + 8 };
unsigned long flags;
init_completion(&compl);
rc = -ENOMEM;
- if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL)
+ if ((cmd = kzalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL)
goto err_alloc;
- memset(cmd, 0, ALLOC_SIZE);
p = (char *)cmd + sizeof(struct ub_scsi_cmd);
cmd->cdb[0] = 0x25;
cmd->cdb_len = 10;
cmd->dir = UB_DIR_READ;
cmd->state = UB_CMDST_INIT;
- cmd->data = p;
+ cmd->nsg = 1;
+ sg = &cmd->sgv[0];
+ sg->page = virt_to_page(p);
+ sg->offset = (unsigned long)p & (PAGE_SIZE-1);
+ sg->length = 8;
cmd->len = 8;
cmd->lun = lun;
cmd->done = ub_probe_done;
cmd->back = &compl;
- spin_lock_irqsave(&sc->lock, flags);
+ spin_lock_irqsave(sc->lock, flags);
cmd->tag = sc->tagcnt++;
rc = ub_submit_scsi(sc, cmd);
- spin_unlock_irqrestore(&sc->lock, flags);
+ spin_unlock_irqrestore(sc->lock, flags);
if (rc != 0) {
printk("ub: reading capacity: submit error (%d)\n", rc); /* P3 */
complete(cop);
}
+/*
+ * Reset with a Bulk reset.
+ */
+static int ub_sync_reset(struct ub_dev *sc)
+{
+ int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber;
+ struct usb_ctrlrequest *cr;
+ struct completion compl;
+ struct timer_list timer;
+ int rc;
+
+ init_completion(&compl);
+
+ cr = &sc->work_cr;
+ cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE;
+ cr->bRequest = US_BULK_RESET_REQUEST;
+ cr->wValue = cpu_to_le16(0);
+ cr->wIndex = cpu_to_le16(ifnum);
+ cr->wLength = cpu_to_le16(0);
+
+ usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe,
+ (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl);
+ sc->work_urb.actual_length = 0;
+ sc->work_urb.error_count = 0;
+ sc->work_urb.status = 0;
+
+ if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) {
+ printk(KERN_WARNING
+ "%s: Unable to submit a bulk reset (%d)\n", sc->name, rc);
+ return rc;
+ }
+
+ init_timer(&timer);
+ timer.function = ub_probe_timeout;
+ timer.data = (unsigned long) &compl;
+ timer.expires = jiffies + UB_CTRL_TIMEOUT;
+ add_timer(&timer);
+
+ wait_for_completion(&compl);
+
+ del_timer_sync(&timer);
+ usb_kill_urb(&sc->work_urb);
+
+ return sc->work_urb.status;
+}
+
/*
* Get number of LUNs by the way of Bulk GetMaxLUN command.
*/
usb_fill_control_urb(&sc->work_urb, sc->dev, sc->recv_ctrl_pipe,
(unsigned char*) cr, p, 1, ub_probe_urb_complete, &compl);
- sc->work_urb.transfer_flags = 0;
sc->work_urb.actual_length = 0;
sc->work_urb.error_count = 0;
sc->work_urb.status = 0;
if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) {
if (rc == -EPIPE) {
- printk("%s: Stall at GetMaxLUN, using 1 LUN\n",
+ printk("%s: Stall submitting GetMaxLUN, using 1 LUN\n",
sc->name); /* P3 */
} else {
- printk(KERN_WARNING
+ printk(KERN_NOTICE
"%s: Unable to submit GetMaxLUN (%d)\n",
sc->name, rc);
}
del_timer_sync(&timer);
usb_kill_urb(&sc->work_urb);
+ if ((rc = sc->work_urb.status) < 0) {
+ if (rc == -EPIPE) {
+ printk("%s: Stall at GetMaxLUN, using 1 LUN\n",
+ sc->name); /* P3 */
+ } else {
+ printk(KERN_NOTICE
+ "%s: Error at GetMaxLUN (%d)\n",
+ sc->name, rc);
+ }
+ goto err_io;
+ }
+
if (sc->work_urb.actual_length != 1) {
printk("%s: GetMaxLUN returned %d bytes\n", sc->name,
sc->work_urb.actual_length); /* P3 */
kfree(p);
return nluns;
+err_io:
err_submit:
kfree(p);
err_alloc:
usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe,
(unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl);
- sc->work_urb.transfer_flags = 0;
sc->work_urb.actual_length = 0;
sc->work_urb.error_count = 0;
sc->work_urb.status = 0;
if (ep_in == NULL || ep_out == NULL) {
printk(KERN_NOTICE "%s: failed endpoint check\n",
sc->name);
- return -EIO;
+ return -ENODEV;
}
/* Calculate and store the pipe values */
int rc;
int i;
+ if (usb_usual_check_type(dev_id, USB_US_TYPE_UB))
+ return -ENXIO;
+
rc = -ENOMEM;
- if ((sc = kmalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL)
+ if ((sc = kzalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL)
goto err_core;
- memset(sc, 0, sizeof(struct ub_dev));
- spin_lock_init(&sc->lock);
+ sc->lock = ub_next_lock();
INIT_LIST_HEAD(&sc->luns);
usb_init_urb(&sc->work_urb);
tasklet_init(&sc->tasklet, ub_scsi_action, (unsigned long)sc);
atomic_set(&sc->poison, 0);
+ INIT_WORK(&sc->reset_work, ub_reset_task, sc);
+ init_waitqueue_head(&sc->reset_wait);
init_timer(&sc->work_timer);
sc->work_timer.data = (unsigned long) sc;
// sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
usb_set_intfdata(intf, sc);
usb_get_dev(sc->dev);
- // usb_get_intf(sc->intf); /* Do we need this? */
+ /*
+ * Since we give the interface struct to the block level through
+ * disk->driverfs_dev, we have to pin it. Otherwise, block_uevent
+ * oopses on close after a disconnect (kernels 2.6.16 and up).
+ */
+ usb_get_intf(sc->intf);
snprintf(sc->name, 12, DRV_NAME "(%d.%d)",
sc->dev->bus->busnum, sc->dev->devnum);
/* XXX Verify that we can handle the device (from descriptors) */
- ub_get_pipes(sc, sc->dev, intf);
-
- if (device_create_file(&sc->intf->dev, &dev_attr_diag) != 0)
- goto err_diag;
+ if (ub_get_pipes(sc, sc->dev, intf) != 0)
+ goto err_dev_desc;
/*
* At this point, all USB initialization is done, do upper layer.
* This is needed to clear toggles. It is a problem only if we do
* `rmmod ub && modprobe ub` without disconnects, but we like that.
*/
+#if 0 /* iPod Mini fails if we do this (big white iPod works) */
ub_probe_clear_stall(sc, sc->recv_bulk_pipe);
ub_probe_clear_stall(sc, sc->send_bulk_pipe);
+#endif
/*
* The way this is used by the startup code is a little specific.
nluns = 1;
for (i = 0; i < 3; i++) {
- if ((rc = ub_sync_getmaxlun(sc)) < 0) {
- /*
- * Some devices (i.e. Iomega Zip100) need this --
- * apparently the bulk pipes get STALLed when the
- * GetMaxLUN request is processed.
- * XXX I have a ZIP-100, verify it does this.
- */
- if (rc == -EPIPE) {
- ub_probe_clear_stall(sc, sc->recv_bulk_pipe);
- ub_probe_clear_stall(sc, sc->send_bulk_pipe);
- }
+ if ((rc = ub_sync_getmaxlun(sc)) < 0)
break;
- }
if (rc != 0) {
nluns = rc;
break;
}
return 0;
- /* device_remove_file(&sc->intf->dev, &dev_attr_diag); */
-err_diag:
+err_dev_desc:
usb_set_intfdata(intf, NULL);
- // usb_put_intf(sc->intf);
+ usb_put_intf(sc->intf);
usb_put_dev(sc->dev);
kfree(sc);
err_core:
int rc;
rc = -ENOMEM;
- if ((lun = kmalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL)
+ if ((lun = kzalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL)
goto err_alloc;
- memset(lun, 0, sizeof(struct ub_lun));
lun->num = lnum;
rc = -ENOSR;
lun->removable = 1; /* XXX Query this from the device */
lun->changed = 1; /* ub_revalidate clears only */
- lun->first_open = 1;
ub_revalidate(sc, lun);
rc = -ENOMEM;
- if ((disk = alloc_disk(UB_MINORS_PER_MAJOR)) == NULL)
+ if ((disk = alloc_disk(UB_PARTS_PER_LUN)) == NULL)
goto err_diskalloc;
lun->disk = disk;
sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a');
sprintf(disk->devfs_name, DEVFS_NAME "/%c", lun->id + 'a');
disk->major = UB_MAJOR;
- disk->first_minor = lun->id * UB_MINORS_PER_MAJOR;
+ disk->first_minor = lun->id * UB_PARTS_PER_LUN;
disk->fops = &ub_bd_fops;
disk->private_data = lun;
- disk->driverfs_dev = &sc->intf->dev; /* XXX Many to one ok? */
+ disk->driverfs_dev = &sc->intf->dev;
rc = -ENOMEM;
- if ((q = blk_init_queue(ub_bd_rq_fn, &sc->lock)) == NULL)
+ if ((q = blk_init_queue(ub_request_fn, sc->lock)) == NULL)
goto err_blkqinit;
disk->queue = q;
*/
atomic_set(&sc->poison, 1);
+ /*
+ * Wait for reset to end, if any.
+ */
+ wait_event(sc->reset_wait, !sc->reset);
+
/*
* Blow away queued commands.
*
* and the whole queue drains. So, we just use this code to
* print warnings.
*/
- spin_lock_irqsave(&sc->lock, flags);
+ spin_lock_irqsave(sc->lock, flags);
{
struct ub_scsi_cmd *cmd;
int cnt = 0;
- while ((cmd = ub_cmdq_pop(sc)) != NULL) {
+ while ((cmd = ub_cmdq_peek(sc)) != NULL) {
cmd->error = -ENOTCONN;
cmd->state = UB_CMDST_DONE;
- ub_cmdtr_state(sc, cmd);
ub_cmdq_pop(sc);
(*cmd->done)(sc, cmd);
cnt++;
"%d was queued after shutdown\n", sc->name, cnt);
}
}
- spin_unlock_irqrestore(&sc->lock, flags);
+ spin_unlock_irqrestore(sc->lock, flags);
/*
* Unregister the upper layer.
}
/*
- * Taking a lock on a structure which is about to be freed
- * is very nonsensual. Here it is largely a way to do a debug freeze,
- * and a bracket which shows where the nonsensual code segment ends.
- *
* Testing for -EINPROGRESS is always a bug, so we are bending
* the rules a little.
*/
- spin_lock_irqsave(&sc->lock, flags);
+ spin_lock_irqsave(sc->lock, flags);
if (sc->work_urb.status == -EINPROGRESS) { /* janitors: ignore */
printk(KERN_WARNING "%s: "
"URB is active after disconnect\n", sc->name);
}
- spin_unlock_irqrestore(&sc->lock, flags);
+ spin_unlock_irqrestore(sc->lock, flags);
/*
* There is virtually no chance that other CPU runs times so long
* and no URBs left in transit.
*/
- device_remove_file(&sc->intf->dev, &dev_attr_diag);
- usb_set_intfdata(intf, NULL);
- // usb_put_intf(sc->intf);
- sc->intf = NULL;
- usb_put_dev(sc->dev);
- sc->dev = NULL;
-
ub_put(sc);
}
static struct usb_driver ub_driver = {
- .owner = THIS_MODULE,
.name = "ub",
.probe = ub_probe,
.disconnect = ub_disconnect,
static int __init ub_init(void)
{
int rc;
+ int i;
- /* P3 */ printk("ub: sizeof ub_scsi_cmd %zu ub_dev %zu ub_lun %zu\n",
- sizeof(struct ub_scsi_cmd), sizeof(struct ub_dev), sizeof(struct ub_lun));
+ for (i = 0; i < UB_QLOCK_NUM; i++)
+ spin_lock_init(&ub_qlockv[i]);
if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0)
goto err_regblkdev;
if ((rc = usb_register(&ub_driver)) != 0)
goto err_register;
+ usb_usual_set_present(USB_US_TYPE_UB);
return 0;
err_register:
devfs_remove(DEVFS_NAME);
unregister_blkdev(UB_MAJOR, DRV_NAME);
+ usb_usual_clear_present(USB_US_TYPE_UB);
}
module_init(ub_init);
git://git.onelab.eu / linux-2.6.git / blobdiff