![Yani Ioannou](/assets/img/avatar_default.png)
Signed-off-by: Yani Ioannou <yani.ioannou@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2344 lines
57 KiB
C
2344 lines
57 KiB
C
/*
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* The low performance USB storage driver (ub).
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*
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* Copyright (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
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* Copyright (C) 2004 Pete Zaitcev (zaitcev@yahoo.com)
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*
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* This work is a part of Linux kernel, is derived from it,
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* and is not licensed separately. See file COPYING for details.
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*
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* TODO (sorted by decreasing priority)
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* -- Kill first_open (Al Viro fixed the block layer now)
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* -- Do resets with usb_device_reset (needs a thread context, use khubd)
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* -- set readonly flag for CDs, set removable flag for CF readers
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* -- do inquiry and verify we got a disk and not a tape (for LUN mismatch)
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* -- special case some senses, e.g. 3a/0 -> no media present, reduce retries
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* -- verify the 13 conditions and do bulk resets
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* -- kill last_pipe and simply do two-state clearing on both pipes
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* -- verify protocol (bulk) from USB descriptors (maybe...)
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* -- highmem and sg
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* -- move top_sense and work_bcs into separate allocations (if they survive)
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* for cache purists and esoteric architectures.
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* -- prune comments, they are too volumnous
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* -- Exterminate P3 printks
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* -- Resove XXX's
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* -- Redo "benh's retries", perhaps have spin-up code to handle them. V:D=?
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/blkdev.h>
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#include <linux/devfs_fs_kernel.h>
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#include <linux/timer.h>
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#include <scsi/scsi.h>
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#define DRV_NAME "ub"
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#define DEVFS_NAME DRV_NAME
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#define UB_MAJOR 180
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/*
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* Definitions which have to be scattered once we understand the layout better.
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*/
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/* Transport (despite PR in the name) */
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#define US_PR_BULK 0x50 /* bulk only */
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/* Protocol */
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#define US_SC_SCSI 0x06 /* Transparent */
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/*
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* This many LUNs per USB device.
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* Every one of them takes a host, see UB_MAX_HOSTS.
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*/
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#define UB_MAX_LUNS 9
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/*
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*/
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#define UB_MINORS_PER_MAJOR 8
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#define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */
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#define UB_SENSE_SIZE 18
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/*
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*/
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/* command block wrapper */
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struct bulk_cb_wrap {
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__le32 Signature; /* contains 'USBC' */
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u32 Tag; /* unique per command id */
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__le32 DataTransferLength; /* size of data */
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u8 Flags; /* direction in bit 0 */
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u8 Lun; /* LUN */
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u8 Length; /* of of the CDB */
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u8 CDB[UB_MAX_CDB_SIZE]; /* max command */
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};
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#define US_BULK_CB_WRAP_LEN 31
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#define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */
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#define US_BULK_FLAG_IN 1
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#define US_BULK_FLAG_OUT 0
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/* command status wrapper */
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struct bulk_cs_wrap {
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__le32 Signature; /* should = 'USBS' */
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u32 Tag; /* same as original command */
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__le32 Residue; /* amount not transferred */
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u8 Status; /* see below */
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};
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#define US_BULK_CS_WRAP_LEN 13
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#define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */
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/* This is for Olympus Camedia digital cameras */
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#define US_BULK_CS_OLYMPUS_SIGN 0x55425355 /* spells out 'USBU' */
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#define US_BULK_STAT_OK 0
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#define US_BULK_STAT_FAIL 1
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#define US_BULK_STAT_PHASE 2
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/* bulk-only class specific requests */
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#define US_BULK_RESET_REQUEST 0xff
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#define US_BULK_GET_MAX_LUN 0xfe
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/*
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*/
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struct ub_dev;
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#define UB_MAX_REQ_SG 1
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#define UB_MAX_SECTORS 64
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/*
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* A second is more than enough for a 32K transfer (UB_MAX_SECTORS)
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* even if a webcam hogs the bus, but some devices need time to spin up.
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*/
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#define UB_URB_TIMEOUT (HZ*2)
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#define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */
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#define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */
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#define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */
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/*
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* An instance of a SCSI command in transit.
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*/
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#define UB_DIR_NONE 0
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#define UB_DIR_READ 1
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#define UB_DIR_ILLEGAL2 2
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#define UB_DIR_WRITE 3
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#define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \
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(((c)==UB_DIR_READ)? 'r': 'n'))
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enum ub_scsi_cmd_state {
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UB_CMDST_INIT, /* Initial state */
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UB_CMDST_CMD, /* Command submitted */
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UB_CMDST_DATA, /* Data phase */
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UB_CMDST_CLR2STS, /* Clearing before requesting status */
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UB_CMDST_STAT, /* Status phase */
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UB_CMDST_CLEAR, /* Clearing a stall (halt, actually) */
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UB_CMDST_SENSE, /* Sending Request Sense */
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UB_CMDST_DONE /* Final state */
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};
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static char *ub_scsi_cmd_stname[] = {
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". ",
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"Cmd",
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"dat",
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"c2s",
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"sts",
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"clr",
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"Sen",
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"fin"
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};
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struct ub_scsi_cmd {
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unsigned char cdb[UB_MAX_CDB_SIZE];
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unsigned char cdb_len;
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unsigned char dir; /* 0 - none, 1 - read, 3 - write. */
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unsigned char trace_index;
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enum ub_scsi_cmd_state state;
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unsigned int tag;
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struct ub_scsi_cmd *next;
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int error; /* Return code - valid upon done */
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unsigned int act_len; /* Return size */
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unsigned char key, asc, ascq; /* May be valid if error==-EIO */
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int stat_count; /* Retries getting status. */
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/*
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* We do not support transfers from highmem pages
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* because the underlying USB framework does not do what we need.
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*/
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char *data; /* Requested buffer */
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unsigned int len; /* Requested length */
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// struct scatterlist sgv[UB_MAX_REQ_SG];
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struct ub_lun *lun;
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void (*done)(struct ub_dev *, struct ub_scsi_cmd *);
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void *back;
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};
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/*
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*/
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struct ub_capacity {
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unsigned long nsec; /* Linux size - 512 byte sectors */
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unsigned int bsize; /* Linux hardsect_size */
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unsigned int bshift; /* Shift between 512 and hard sects */
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};
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/*
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* The SCSI command tracing structure.
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*/
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#define SCMD_ST_HIST_SZ 8
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#define SCMD_TRACE_SZ 63 /* Less than 4KB of 61-byte lines */
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struct ub_scsi_cmd_trace {
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int hcur;
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unsigned int tag;
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unsigned int req_size, act_size;
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unsigned char op;
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unsigned char dir;
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unsigned char key, asc, ascq;
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char st_hst[SCMD_ST_HIST_SZ];
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};
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struct ub_scsi_trace {
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int cur;
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struct ub_scsi_cmd_trace vec[SCMD_TRACE_SZ];
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};
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/*
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* This is a direct take-off from linux/include/completion.h
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* The difference is that I do not wait on this thing, just poll.
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* When I want to wait (ub_probe), I just use the stock completion.
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*
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* Note that INIT_COMPLETION takes no lock. It is correct. But why
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* in the bloody hell that thing takes struct instead of pointer to struct
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* is quite beyond me. I just copied it from the stock completion.
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*/
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struct ub_completion {
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unsigned int done;
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spinlock_t lock;
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};
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static inline void ub_init_completion(struct ub_completion *x)
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{
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x->done = 0;
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spin_lock_init(&x->lock);
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}
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#define UB_INIT_COMPLETION(x) ((x).done = 0)
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static void ub_complete(struct ub_completion *x)
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{
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unsigned long flags;
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spin_lock_irqsave(&x->lock, flags);
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x->done++;
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spin_unlock_irqrestore(&x->lock, flags);
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}
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static int ub_is_completed(struct ub_completion *x)
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{
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&x->lock, flags);
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ret = x->done;
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spin_unlock_irqrestore(&x->lock, flags);
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return ret;
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}
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/*
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*/
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struct ub_scsi_cmd_queue {
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int qlen, qmax;
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struct ub_scsi_cmd *head, *tail;
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};
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/*
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* The block device instance (one per LUN).
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*/
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struct ub_lun {
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struct ub_dev *udev;
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struct list_head link;
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struct gendisk *disk;
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int id; /* Host index */
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int num; /* LUN number */
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char name[16];
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int changed; /* Media was changed */
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int removable;
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int readonly;
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int first_open; /* Kludge. See ub_bd_open. */
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/* Use Ingo's mempool if or when we have more than one command. */
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/*
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* Currently we never need more than one command for the whole device.
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* However, giving every LUN a command is a cheap and automatic way
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* to enforce fairness between them.
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*/
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int cmda[1];
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struct ub_scsi_cmd cmdv[1];
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struct ub_capacity capacity;
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};
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/*
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* The USB device instance.
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*/
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struct ub_dev {
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spinlock_t lock;
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atomic_t poison; /* The USB device is disconnected */
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int openc; /* protected by ub_lock! */
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/* kref is too implicit for our taste */
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unsigned int tagcnt;
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char name[12];
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struct usb_device *dev;
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struct usb_interface *intf;
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struct list_head luns;
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unsigned int send_bulk_pipe; /* cached pipe values */
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unsigned int recv_bulk_pipe;
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unsigned int send_ctrl_pipe;
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unsigned int recv_ctrl_pipe;
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struct tasklet_struct tasklet;
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struct ub_scsi_cmd_queue cmd_queue;
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struct ub_scsi_cmd top_rqs_cmd; /* REQUEST SENSE */
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unsigned char top_sense[UB_SENSE_SIZE];
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struct ub_completion work_done;
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struct urb work_urb;
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struct timer_list work_timer;
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int last_pipe; /* What might need clearing */
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struct bulk_cb_wrap work_bcb;
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struct bulk_cs_wrap work_bcs;
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struct usb_ctrlrequest work_cr;
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struct ub_scsi_trace tr;
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};
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/*
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*/
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static void ub_cleanup(struct ub_dev *sc);
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static int ub_bd_rq_fn_1(struct ub_lun *lun, struct request *rq);
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static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
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struct ub_scsi_cmd *cmd, struct request *rq);
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static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
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struct request *rq);
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static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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static void ub_end_rq(struct request *rq, int uptodate);
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static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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static void ub_urb_complete(struct urb *urb, struct pt_regs *pt);
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static void ub_scsi_action(unsigned long _dev);
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static void ub_scsi_dispatch(struct ub_dev *sc);
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static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc);
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static void __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
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int stalled_pipe);
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static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd);
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static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun);
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static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun,
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struct ub_capacity *ret);
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static int ub_probe_lun(struct ub_dev *sc, int lnum);
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/*
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*/
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static struct usb_device_id ub_usb_ids[] = {
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// { USB_DEVICE_VER(0x0781, 0x0002, 0x0009, 0x0009) }, /* SDDR-31 */
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{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) },
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{ }
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};
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MODULE_DEVICE_TABLE(usb, ub_usb_ids);
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/*
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* Find me a way to identify "next free minor" for add_disk(),
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* and the array disappears the next day. However, the number of
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* hosts has something to do with the naming and /proc/partitions.
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* This has to be thought out in detail before changing.
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* If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure.
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*/
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#define UB_MAX_HOSTS 26
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static char ub_hostv[UB_MAX_HOSTS];
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static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */
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/*
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* The SCSI command tracing procedures.
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*/
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static void ub_cmdtr_new(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
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{
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int n;
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struct ub_scsi_cmd_trace *t;
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if ((n = sc->tr.cur + 1) == SCMD_TRACE_SZ) n = 0;
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t = &sc->tr.vec[n];
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memset(t, 0, sizeof(struct ub_scsi_cmd_trace));
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t->tag = cmd->tag;
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t->op = cmd->cdb[0];
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t->dir = cmd->dir;
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t->req_size = cmd->len;
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t->st_hst[0] = cmd->state;
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sc->tr.cur = n;
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cmd->trace_index = n;
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}
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static void ub_cmdtr_state(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
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{
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int n;
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struct ub_scsi_cmd_trace *t;
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t = &sc->tr.vec[cmd->trace_index];
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if (t->tag == cmd->tag) {
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if ((n = t->hcur + 1) == SCMD_ST_HIST_SZ) n = 0;
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t->st_hst[n] = cmd->state;
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t->hcur = n;
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}
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}
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static void ub_cmdtr_act_len(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
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{
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struct ub_scsi_cmd_trace *t;
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t = &sc->tr.vec[cmd->trace_index];
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if (t->tag == cmd->tag)
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t->act_size = cmd->act_len;
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}
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static void ub_cmdtr_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
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unsigned char *sense)
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{
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struct ub_scsi_cmd_trace *t;
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t = &sc->tr.vec[cmd->trace_index];
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if (t->tag == cmd->tag) {
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t->key = sense[2] & 0x0F;
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t->asc = sense[12];
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t->ascq = sense[13];
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}
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}
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static ssize_t ub_diag_show(struct device *dev, struct device_attribute *attr, char *page)
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{
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struct usb_interface *intf;
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struct ub_dev *sc;
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struct list_head *p;
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struct ub_lun *lun;
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int cnt;
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unsigned long flags;
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int nc, nh;
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int i, j;
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struct ub_scsi_cmd_trace *t;
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intf = to_usb_interface(dev);
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sc = usb_get_intfdata(intf);
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if (sc == NULL)
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return 0;
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cnt = 0;
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spin_lock_irqsave(&sc->lock, flags);
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cnt += sprintf(page + cnt,
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"qlen %d qmax %d\n",
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sc->cmd_queue.qlen, sc->cmd_queue.qmax);
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list_for_each (p, &sc->luns) {
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lun = list_entry(p, struct ub_lun, link);
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cnt += sprintf(page + cnt,
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"lun %u changed %d removable %d readonly %d\n",
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lun->num, lun->changed, lun->removable, lun->readonly);
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}
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if ((nc = sc->tr.cur + 1) == SCMD_TRACE_SZ) nc = 0;
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for (j = 0; j < SCMD_TRACE_SZ; j++) {
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t = &sc->tr.vec[nc];
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cnt += sprintf(page + cnt, "%08x %02x", t->tag, t->op);
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if (t->op == REQUEST_SENSE) {
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cnt += sprintf(page + cnt, " [sense %x %02x %02x]",
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t->key, t->asc, t->ascq);
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} else {
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cnt += sprintf(page + cnt, " %c", UB_DIR_CHAR(t->dir));
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cnt += sprintf(page + cnt, " [%5d %5d]",
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t->req_size, t->act_size);
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}
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if ((nh = t->hcur + 1) == SCMD_ST_HIST_SZ) nh = 0;
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for (i = 0; i < SCMD_ST_HIST_SZ; i++) {
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cnt += sprintf(page + cnt, " %s",
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ub_scsi_cmd_stname[(int)t->st_hst[nh]]);
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if (++nh == SCMD_ST_HIST_SZ) nh = 0;
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}
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cnt += sprintf(page + cnt, "\n");
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if (++nc == SCMD_TRACE_SZ) nc = 0;
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}
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spin_unlock_irqrestore(&sc->lock, flags);
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return cnt;
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}
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|
|
static DEVICE_ATTR(diag, S_IRUGO, ub_diag_show, NULL); /* N.B. World readable */
|
|
|
|
/*
|
|
* The id allocator.
|
|
*
|
|
* This also stores the host for indexing by minor, which is somewhat dirty.
|
|
*/
|
|
static int ub_id_get(void)
|
|
{
|
|
unsigned long flags;
|
|
int i;
|
|
|
|
spin_lock_irqsave(&ub_lock, flags);
|
|
for (i = 0; i < UB_MAX_HOSTS; i++) {
|
|
if (ub_hostv[i] == 0) {
|
|
ub_hostv[i] = 1;
|
|
spin_unlock_irqrestore(&ub_lock, flags);
|
|
return i;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&ub_lock, flags);
|
|
return -1;
|
|
}
|
|
|
|
static void ub_id_put(int id)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (id < 0 || id >= UB_MAX_HOSTS) {
|
|
printk(KERN_ERR DRV_NAME ": bad host ID %d\n", id);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&ub_lock, flags);
|
|
if (ub_hostv[id] == 0) {
|
|
spin_unlock_irqrestore(&ub_lock, flags);
|
|
printk(KERN_ERR DRV_NAME ": freeing free host ID %d\n", id);
|
|
return;
|
|
}
|
|
ub_hostv[id] = 0;
|
|
spin_unlock_irqrestore(&ub_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Downcount for deallocation. This rides on two assumptions:
|
|
* - once something is poisoned, its refcount cannot grow
|
|
* - opens cannot happen at this time (del_gendisk was done)
|
|
* If the above is true, we can drop the lock, which we need for
|
|
* blk_cleanup_queue(): the silly thing may attempt to sleep.
|
|
* [Actually, it never needs to sleep for us, but it calls might_sleep()]
|
|
*/
|
|
static void ub_put(struct ub_dev *sc)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ub_lock, flags);
|
|
--sc->openc;
|
|
if (sc->openc == 0 && atomic_read(&sc->poison)) {
|
|
spin_unlock_irqrestore(&ub_lock, flags);
|
|
ub_cleanup(sc);
|
|
} else {
|
|
spin_unlock_irqrestore(&ub_lock, flags);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Final cleanup and deallocation.
|
|
*/
|
|
static void ub_cleanup(struct ub_dev *sc)
|
|
{
|
|
struct list_head *p;
|
|
struct ub_lun *lun;
|
|
request_queue_t *q;
|
|
|
|
while (!list_empty(&sc->luns)) {
|
|
p = sc->luns.next;
|
|
lun = list_entry(p, struct ub_lun, link);
|
|
list_del(p);
|
|
|
|
/* I don't think queue can be NULL. But... Stolen from sx8.c */
|
|
if ((q = lun->disk->queue) != NULL)
|
|
blk_cleanup_queue(q);
|
|
/*
|
|
* If we zero disk->private_data BEFORE put_disk, we have
|
|
* to check for NULL all over the place in open, release,
|
|
* check_media and revalidate, because the block level
|
|
* semaphore is well inside the put_disk.
|
|
* But we cannot zero after the call, because *disk is gone.
|
|
* The sd.c is blatantly racy in this area.
|
|
*/
|
|
/* disk->private_data = NULL; */
|
|
put_disk(lun->disk);
|
|
lun->disk = NULL;
|
|
|
|
ub_id_put(lun->id);
|
|
kfree(lun);
|
|
}
|
|
|
|
kfree(sc);
|
|
}
|
|
|
|
/*
|
|
* The "command allocator".
|
|
*/
|
|
static struct ub_scsi_cmd *ub_get_cmd(struct ub_lun *lun)
|
|
{
|
|
struct ub_scsi_cmd *ret;
|
|
|
|
if (lun->cmda[0])
|
|
return NULL;
|
|
ret = &lun->cmdv[0];
|
|
lun->cmda[0] = 1;
|
|
return ret;
|
|
}
|
|
|
|
static void ub_put_cmd(struct ub_lun *lun, struct ub_scsi_cmd *cmd)
|
|
{
|
|
if (cmd != &lun->cmdv[0]) {
|
|
printk(KERN_WARNING "%s: releasing a foreign cmd %p\n",
|
|
lun->name, cmd);
|
|
return;
|
|
}
|
|
if (!lun->cmda[0]) {
|
|
printk(KERN_WARNING "%s: releasing a free cmd\n", lun->name);
|
|
return;
|
|
}
|
|
lun->cmda[0] = 0;
|
|
}
|
|
|
|
/*
|
|
* The command queue.
|
|
*/
|
|
static void ub_cmdq_add(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
|
|
{
|
|
struct ub_scsi_cmd_queue *t = &sc->cmd_queue;
|
|
|
|
if (t->qlen++ == 0) {
|
|
t->head = cmd;
|
|
t->tail = cmd;
|
|
} else {
|
|
t->tail->next = cmd;
|
|
t->tail = cmd;
|
|
}
|
|
|
|
if (t->qlen > t->qmax)
|
|
t->qmax = t->qlen;
|
|
}
|
|
|
|
static void ub_cmdq_insert(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
|
|
{
|
|
struct ub_scsi_cmd_queue *t = &sc->cmd_queue;
|
|
|
|
if (t->qlen++ == 0) {
|
|
t->head = cmd;
|
|
t->tail = cmd;
|
|
} else {
|
|
cmd->next = t->head;
|
|
t->head = cmd;
|
|
}
|
|
|
|
if (t->qlen > t->qmax)
|
|
t->qmax = t->qlen;
|
|
}
|
|
|
|
static struct ub_scsi_cmd *ub_cmdq_pop(struct ub_dev *sc)
|
|
{
|
|
struct ub_scsi_cmd_queue *t = &sc->cmd_queue;
|
|
struct ub_scsi_cmd *cmd;
|
|
|
|
if (t->qlen == 0)
|
|
return NULL;
|
|
if (--t->qlen == 0)
|
|
t->tail = NULL;
|
|
cmd = t->head;
|
|
t->head = cmd->next;
|
|
cmd->next = NULL;
|
|
return cmd;
|
|
}
|
|
|
|
#define ub_cmdq_peek(sc) ((sc)->cmd_queue.head)
|
|
|
|
/*
|
|
* The request function is our main entry point
|
|
*/
|
|
|
|
static void ub_bd_rq_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) {
|
|
blk_stop_queue(q);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int ub_bd_rq_fn_1(struct ub_lun *lun, struct request *rq)
|
|
{
|
|
struct ub_dev *sc = lun->udev;
|
|
struct ub_scsi_cmd *cmd;
|
|
int rc;
|
|
|
|
if (atomic_read(&sc->poison) || lun->changed) {
|
|
blkdev_dequeue_request(rq);
|
|
ub_end_rq(rq, 0);
|
|
return 0;
|
|
}
|
|
|
|
if ((cmd = ub_get_cmd(lun)) == NULL)
|
|
return -1;
|
|
memset(cmd, 0, sizeof(struct ub_scsi_cmd));
|
|
|
|
blkdev_dequeue_request(rq);
|
|
|
|
if (blk_pc_request(rq)) {
|
|
rc = ub_cmd_build_packet(sc, cmd, rq);
|
|
} 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;
|
|
}
|
|
cmd->state = UB_CMDST_INIT;
|
|
cmd->lun = lun;
|
|
cmd->done = ub_rw_cmd_done;
|
|
cmd->back = rq;
|
|
|
|
cmd->tag = sc->tagcnt++;
|
|
if ((rc = ub_submit_scsi(sc, cmd)) != 0) {
|
|
ub_put_cmd(lun, cmd);
|
|
ub_end_rq(rq, 0);
|
|
return 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)
|
|
{
|
|
int ub_dir;
|
|
#if 0 /* We use rq->buffer for now */
|
|
struct scatterlist *sg;
|
|
int n_elem;
|
|
#endif
|
|
unsigned int block, nblks;
|
|
|
|
if (rq_data_dir(rq) == WRITE)
|
|
ub_dir = UB_DIR_WRITE;
|
|
else
|
|
ub_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;
|
|
}
|
|
|
|
/*
|
|
* build the command
|
|
*
|
|
* The call to blk_queue_hardsect_size() guarantees that request
|
|
* is aligned, but it is given in terms of 512 byte units, always.
|
|
*/
|
|
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;
|
|
/* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */
|
|
cmd->cdb[2] = block >> 24;
|
|
cmd->cdb[3] = block >> 16;
|
|
cmd->cdb[4] = block >> 8;
|
|
cmd->cdb[5] = block;
|
|
cmd->cdb[7] = nblks >> 8;
|
|
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)
|
|
{
|
|
|
|
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;
|
|
|
|
if (rq->data_len == 0) {
|
|
cmd->dir = UB_DIR_NONE;
|
|
} else {
|
|
if (rq_data_dir(rq) == WRITE)
|
|
cmd->dir = UB_DIR_WRITE;
|
|
else
|
|
cmd->dir = UB_DIR_READ;
|
|
}
|
|
cmd->data = rq->data;
|
|
cmd->len = rq->data_len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
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;
|
|
}
|
|
|
|
if (cmd->error == 0)
|
|
uptodate = 1;
|
|
else
|
|
uptodate = 0;
|
|
|
|
ub_put_cmd(lun, cmd);
|
|
ub_end_rq(rq, uptodate);
|
|
blk_start_queue(q);
|
|
}
|
|
|
|
static void ub_end_rq(struct request *rq, int uptodate)
|
|
{
|
|
int rc;
|
|
|
|
rc = end_that_request_first(rq, uptodate, rq->hard_nr_sectors);
|
|
// assert(rc == 0);
|
|
end_that_request_last(rq);
|
|
}
|
|
|
|
/*
|
|
* Submit a regular SCSI operation (not an auto-sense).
|
|
*
|
|
* The Iron Law of Good Submit Routine is:
|
|
* Zero return - callback is done, Nonzero return - callback is not done.
|
|
* 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)
|
|
{
|
|
|
|
if (cmd->state != UB_CMDST_INIT ||
|
|
(cmd->dir != UB_DIR_NONE && cmd->len == 0)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
ub_cmdq_add(sc, cmd);
|
|
/*
|
|
* We can call ub_scsi_dispatch(sc) right away here, but it's a little
|
|
* safer to jump to a tasklet, in case upper layers do something silly.
|
|
*/
|
|
tasklet_schedule(&sc->tasklet);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Submit the first URB for the queued command.
|
|
* This function does not deal with queueing in any way.
|
|
*/
|
|
static int ub_scsi_cmd_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
|
|
{
|
|
struct bulk_cb_wrap *bcb;
|
|
int rc;
|
|
|
|
bcb = &sc->work_bcb;
|
|
|
|
/*
|
|
* ``If the allocation length is eighteen or greater, and a device
|
|
* server returns less than eithteen bytes of data, the application
|
|
* client should assume that the bytes not transferred would have been
|
|
* zeroes had the device server returned those bytes.''
|
|
*
|
|
* We zero sense for all commands so that when a packet request
|
|
* fails it does not return a stale sense.
|
|
*/
|
|
memset(&sc->top_sense, 0, UB_SENSE_SIZE);
|
|
|
|
/* set up the command wrapper */
|
|
bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
|
|
bcb->Tag = cmd->tag; /* Endianness is not important */
|
|
bcb->DataTransferLength = cpu_to_le32(cmd->len);
|
|
bcb->Flags = (cmd->dir == UB_DIR_READ) ? 0x80 : 0;
|
|
bcb->Lun = (cmd->lun != NULL) ? cmd->lun->num : 0;
|
|
bcb->Length = cmd->cdb_len;
|
|
|
|
/* copy the command payload */
|
|
memcpy(bcb->CDB, cmd->cdb, UB_MAX_CDB_SIZE);
|
|
|
|
UB_INIT_COMPLETION(sc->work_done);
|
|
|
|
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;
|
|
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: cmd #%d start failed (%d)\n", cmd->tag, rc); /* P3 */
|
|
ub_complete(&sc->work_done);
|
|
return rc;
|
|
}
|
|
|
|
sc->work_timer.expires = jiffies + UB_URB_TIMEOUT;
|
|
add_timer(&sc->work_timer);
|
|
|
|
cmd->state = UB_CMDST_CMD;
|
|
ub_cmdtr_state(sc, cmd);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Timeout handler.
|
|
*/
|
|
static void ub_urb_timeout(unsigned long arg)
|
|
{
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Completion routine for the work URB.
|
|
*
|
|
* This can be called directly from usb_submit_urb (while we have
|
|
* the sc->lock taken) and from an interrupt (while we do NOT have
|
|
* the sc->lock taken). Therefore, bounce this off to a tasklet.
|
|
*/
|
|
static void ub_urb_complete(struct urb *urb, struct pt_regs *pt)
|
|
{
|
|
struct ub_dev *sc = urb->context;
|
|
|
|
ub_complete(&sc->work_done);
|
|
tasklet_schedule(&sc->tasklet);
|
|
}
|
|
|
|
static void ub_scsi_action(unsigned long _dev)
|
|
{
|
|
struct ub_dev *sc = (struct ub_dev *) _dev;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&sc->lock, flags);
|
|
del_timer(&sc->work_timer);
|
|
ub_scsi_dispatch(sc);
|
|
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) {
|
|
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;
|
|
ub_scsi_urb_compl(sc, cmd);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
|
|
{
|
|
struct urb *urb = &sc->work_urb;
|
|
struct bulk_cs_wrap *bcs;
|
|
int pipe;
|
|
int rc;
|
|
|
|
if (atomic_read(&sc->poison)) {
|
|
/* A little too simplistic, I feel... */
|
|
goto Bad_End;
|
|
}
|
|
|
|
if (cmd->state == UB_CMDST_CLEAR) {
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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_sense(sc, cmd);
|
|
|
|
} 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;
|
|
}
|
|
|
|
/*
|
|
* 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(sc, cmd);
|
|
|
|
} else if (cmd->state == UB_CMDST_CMD) {
|
|
if (urb->status == -EPIPE) {
|
|
rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe);
|
|
if (rc != 0) {
|
|
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;
|
|
}
|
|
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 */
|
|
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) {
|
|
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);
|
|
|
|
} else if (cmd->state == UB_CMDST_DATA) {
|
|
if (urb->status == -EPIPE) {
|
|
rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe);
|
|
if (rc != 0) {
|
|
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;
|
|
}
|
|
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... */
|
|
} else {
|
|
if (urb->status != 0)
|
|
goto Bad_End;
|
|
}
|
|
|
|
cmd->act_len = urb->actual_length;
|
|
ub_cmdtr_act_len(sc, cmd);
|
|
|
|
ub_state_stat(sc, cmd);
|
|
|
|
} else if (cmd->state == UB_CMDST_STAT) {
|
|
if (urb->status == -EPIPE) {
|
|
rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe);
|
|
if (rc != 0) {
|
|
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;
|
|
}
|
|
cmd->state = UB_CMDST_CLEAR;
|
|
ub_cmdtr_state(sc, cmd);
|
|
return;
|
|
}
|
|
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);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Check the returned Bulk protocol status.
|
|
*/
|
|
|
|
bcs = &sc->work_bcs;
|
|
rc = le32_to_cpu(bcs->Residue);
|
|
if (rc != 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, 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. */
|
|
}
|
|
#endif
|
|
|
|
if (bcs->Tag != cmd->tag) {
|
|
/*
|
|
* This usually happens when we disagree with the
|
|
* device's microcode about something. For instance,
|
|
* a few of them throw this after timeouts. They buffer
|
|
* 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);
|
|
return;
|
|
}
|
|
|
|
switch (bcs->Status) {
|
|
case US_BULK_STAT_OK:
|
|
break;
|
|
case US_BULK_STAT_FAIL:
|
|
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;
|
|
}
|
|
|
|
/* Not zeroing error to preserve a babble indicator */
|
|
cmd->state = UB_CMDST_DONE;
|
|
ub_cmdtr_state(sc, cmd);
|
|
ub_cmdq_pop(sc);
|
|
(*cmd->done)(sc, cmd);
|
|
|
|
} else if (cmd->state == UB_CMDST_SENSE) {
|
|
ub_state_done(sc, cmd, -EIO);
|
|
|
|
} else {
|
|
printk(KERN_WARNING "%s: "
|
|
"wrong command state %d\n",
|
|
sc->name, cmd->state);
|
|
goto Bad_End;
|
|
}
|
|
return;
|
|
|
|
Bad_End: /* Little Excel is dead */
|
|
ub_state_done(sc, cmd, -EIO);
|
|
}
|
|
|
|
/*
|
|
* Factorization helper for the command state machine:
|
|
* Finish the command.
|
|
*/
|
|
static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc)
|
|
{
|
|
|
|
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)
|
|
{
|
|
int rc;
|
|
|
|
UB_INIT_COMPLETION(sc->work_done);
|
|
|
|
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;
|
|
|
|
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_STAT_TIMEOUT;
|
|
add_timer(&sc->work_timer);
|
|
}
|
|
|
|
/*
|
|
* Factorization helper for the command state machine:
|
|
* Submit a CSW read and go to STAT state.
|
|
*/
|
|
static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
|
|
{
|
|
__ub_state_stat(sc, cmd);
|
|
|
|
cmd->stat_count = 0;
|
|
cmd->state = UB_CMDST_STAT;
|
|
ub_cmdtr_state(sc, cmd);
|
|
}
|
|
|
|
/*
|
|
* Factorization helper for the command state machine:
|
|
* Submit a REQUEST SENSE and go to SENSE state.
|
|
*/
|
|
static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
|
|
{
|
|
struct ub_scsi_cmd *scmd;
|
|
int rc;
|
|
|
|
if (cmd->cdb[0] == REQUEST_SENSE) {
|
|
rc = -EPIPE;
|
|
goto error;
|
|
}
|
|
|
|
scmd = &sc->top_rqs_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->len = UB_SENSE_SIZE;
|
|
scmd->lun = cmd->lun;
|
|
scmd->done = ub_top_sense_done;
|
|
scmd->back = cmd;
|
|
|
|
scmd->tag = sc->tagcnt++;
|
|
|
|
cmd->state = UB_CMDST_SENSE;
|
|
ub_cmdtr_state(sc, cmd);
|
|
|
|
ub_cmdq_insert(sc, scmd);
|
|
return;
|
|
|
|
error:
|
|
ub_state_done(sc, cmd, rc);
|
|
}
|
|
|
|
/*
|
|
* A helper for the command's state machine:
|
|
* Submit a stall clear.
|
|
*/
|
|
static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
|
|
int stalled_pipe)
|
|
{
|
|
int endp;
|
|
struct usb_ctrlrequest *cr;
|
|
int rc;
|
|
|
|
endp = usb_pipeendpoint(stalled_pipe);
|
|
if (usb_pipein (stalled_pipe))
|
|
endp |= USB_DIR_IN;
|
|
|
|
cr = &sc->work_cr;
|
|
cr->bRequestType = USB_RECIP_ENDPOINT;
|
|
cr->bRequest = USB_REQ_CLEAR_FEATURE;
|
|
cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT);
|
|
cr->wIndex = cpu_to_le16(endp);
|
|
cr->wLength = cpu_to_le16(0);
|
|
|
|
UB_INIT_COMPLETION(sc->work_done);
|
|
|
|
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;
|
|
|
|
if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) {
|
|
ub_complete(&sc->work_done);
|
|
return rc;
|
|
}
|
|
|
|
sc->work_timer.expires = jiffies + UB_CTRL_TIMEOUT;
|
|
add_timer(&sc->work_timer);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
*/
|
|
static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd)
|
|
{
|
|
unsigned char *sense = scmd->data;
|
|
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.
|
|
*/
|
|
if ((cmd = ub_cmdq_peek(sc)) == NULL) {
|
|
printk(KERN_WARNING "%s: sense done while idle\n", sc->name);
|
|
return;
|
|
}
|
|
if (cmd != scmd->back) {
|
|
printk(KERN_WARNING "%s: "
|
|
"sense done for wrong command 0x%x\n",
|
|
sc->name, cmd->tag);
|
|
return;
|
|
}
|
|
if (cmd->state != UB_CMDST_SENSE) {
|
|
printk(KERN_WARNING "%s: "
|
|
"sense done with bad cmd state %d\n",
|
|
sc->name, cmd->state);
|
|
return;
|
|
}
|
|
|
|
cmd->key = sense[2] & 0x0F;
|
|
cmd->asc = sense[12];
|
|
cmd->ascq = sense[13];
|
|
|
|
ub_scsi_urb_compl(sc, cmd);
|
|
}
|
|
|
|
/*
|
|
* This is called from a process context.
|
|
*/
|
|
static void ub_revalidate(struct ub_dev *sc, struct ub_lun *lun)
|
|
{
|
|
|
|
lun->readonly = 0; /* XXX Query this from the device */
|
|
|
|
lun->capacity.nsec = 0;
|
|
lun->capacity.bsize = 512;
|
|
lun->capacity.bshift = 0;
|
|
|
|
if (ub_sync_tur(sc, lun) != 0)
|
|
return; /* Not ready */
|
|
lun->changed = 0;
|
|
|
|
if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) {
|
|
/*
|
|
* The retry here means something is wrong, either with the
|
|
* device, with the transport, or with our code.
|
|
* We keep this because sd.c has retries for capacity.
|
|
*/
|
|
if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) {
|
|
lun->capacity.nsec = 0;
|
|
lun->capacity.bsize = 512;
|
|
lun->capacity.bshift = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The open funcion.
|
|
* This is mostly needed to keep refcounting, but also to support
|
|
* media checks on removable media drives.
|
|
*/
|
|
static int ub_bd_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct gendisk *disk = inode->i_bdev->bd_disk;
|
|
struct ub_lun *lun;
|
|
struct ub_dev *sc;
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
if ((lun = disk->private_data) == NULL)
|
|
return -ENXIO;
|
|
sc = lun->udev;
|
|
|
|
spin_lock_irqsave(&ub_lock, flags);
|
|
if (atomic_read(&sc->poison)) {
|
|
spin_unlock_irqrestore(&ub_lock, flags);
|
|
return -ENXIO;
|
|
}
|
|
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);
|
|
|
|
/*
|
|
* The sd.c considers ->media_present and ->changed not equivalent,
|
|
* under some pretty murky conditions (a failure of READ CAPACITY).
|
|
* We may need it one day.
|
|
*/
|
|
if (lun->removable && lun->changed && !(filp->f_flags & O_NDELAY)) {
|
|
rc = -ENOMEDIUM;
|
|
goto err_open;
|
|
}
|
|
|
|
if (lun->readonly && (filp->f_mode & FMODE_WRITE)) {
|
|
rc = -EROFS;
|
|
goto err_open;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_open:
|
|
ub_put(sc);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
*/
|
|
static int ub_bd_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct gendisk *disk = inode->i_bdev->bd_disk;
|
|
struct ub_lun *lun = disk->private_data;
|
|
struct ub_dev *sc = lun->udev;
|
|
|
|
ub_put(sc);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The ioctl interface.
|
|
*/
|
|
static int ub_bd_ioctl(struct inode *inode, struct file *filp,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct gendisk *disk = inode->i_bdev->bd_disk;
|
|
void __user *usermem = (void __user *) arg;
|
|
|
|
return scsi_cmd_ioctl(filp, disk, cmd, usermem);
|
|
}
|
|
|
|
/*
|
|
* This is called once a new disk was seen by the block layer or by ub_probe().
|
|
* The main onjective here is to discover the features of the media such as
|
|
* the capacity, read-only status, etc. USB storage generally does not
|
|
* need to be spun up, but if we needed it, this would be the place.
|
|
*
|
|
* This call can sleep.
|
|
*
|
|
* The return code is not used.
|
|
*/
|
|
static int ub_bd_revalidate(struct gendisk *disk)
|
|
{
|
|
struct ub_lun *lun = disk->private_data;
|
|
|
|
ub_revalidate(lun->udev, lun);
|
|
|
|
/* XXX Support sector size switching like in sr.c */
|
|
blk_queue_hardsect_size(disk->queue, lun->capacity.bsize);
|
|
set_capacity(disk, lun->capacity.nsec);
|
|
// set_disk_ro(sdkp->disk, lun->readonly);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The check is called by the block layer to verify if the media
|
|
* is still available. It is supposed to be harmless, lightweight and
|
|
* non-intrusive in case the media was not changed.
|
|
*
|
|
* This call can sleep.
|
|
*
|
|
* The return code is bool!
|
|
*/
|
|
static int ub_bd_media_changed(struct gendisk *disk)
|
|
{
|
|
struct ub_lun *lun = disk->private_data;
|
|
|
|
if (!lun->removable)
|
|
return 0;
|
|
|
|
/*
|
|
* We clean checks always after every command, so this is not
|
|
* as dangerous as it looks. If the TEST_UNIT_READY fails here,
|
|
* the device is actually not ready with operator or software
|
|
* intervention required. One dangerous item might be a drive which
|
|
* spins itself down, and come the time to write dirty pages, this
|
|
* will fail, then block layer discards the data. Since we never
|
|
* spin drives up, such devices simply cannot be used with ub anyway.
|
|
*/
|
|
if (ub_sync_tur(lun->udev, lun) != 0) {
|
|
lun->changed = 1;
|
|
return 1;
|
|
}
|
|
|
|
return lun->changed;
|
|
}
|
|
|
|
static struct block_device_operations ub_bd_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ub_bd_open,
|
|
.release = ub_bd_release,
|
|
.ioctl = ub_bd_ioctl,
|
|
.media_changed = ub_bd_media_changed,
|
|
.revalidate_disk = ub_bd_revalidate,
|
|
};
|
|
|
|
/*
|
|
* Common ->done routine for commands executed synchronously.
|
|
*/
|
|
static void ub_probe_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
|
|
{
|
|
struct completion *cop = cmd->back;
|
|
complete(cop);
|
|
}
|
|
|
|
/*
|
|
* Test if the device has a check condition on it, synchronously.
|
|
*/
|
|
static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun)
|
|
{
|
|
struct ub_scsi_cmd *cmd;
|
|
enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) };
|
|
unsigned long flags;
|
|
struct completion compl;
|
|
int rc;
|
|
|
|
init_completion(&compl);
|
|
|
|
rc = -ENOMEM;
|
|
if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL)
|
|
goto err_alloc;
|
|
memset(cmd, 0, ALLOC_SIZE);
|
|
|
|
cmd->cdb[0] = TEST_UNIT_READY;
|
|
cmd->cdb_len = 6;
|
|
cmd->dir = UB_DIR_NONE;
|
|
cmd->state = UB_CMDST_INIT;
|
|
cmd->lun = lun; /* This may be NULL, but that's ok */
|
|
cmd->done = ub_probe_done;
|
|
cmd->back = &compl;
|
|
|
|
spin_lock_irqsave(&sc->lock, flags);
|
|
cmd->tag = sc->tagcnt++;
|
|
|
|
rc = ub_submit_scsi(sc, cmd);
|
|
spin_unlock_irqrestore(&sc->lock, flags);
|
|
|
|
if (rc != 0) {
|
|
printk("ub: testing ready: submit error (%d)\n", rc); /* P3 */
|
|
goto err_submit;
|
|
}
|
|
|
|
wait_for_completion(&compl);
|
|
|
|
rc = cmd->error;
|
|
|
|
if (rc == -EIO && cmd->key != 0) /* Retries for benh's key */
|
|
rc = cmd->key;
|
|
|
|
err_submit:
|
|
kfree(cmd);
|
|
err_alloc:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Read the SCSI capacity synchronously (for probing).
|
|
*/
|
|
static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun,
|
|
struct ub_capacity *ret)
|
|
{
|
|
struct ub_scsi_cmd *cmd;
|
|
char *p;
|
|
enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) + 8 };
|
|
unsigned long flags;
|
|
unsigned int bsize, shift;
|
|
unsigned long nsec;
|
|
struct completion compl;
|
|
int rc;
|
|
|
|
init_completion(&compl);
|
|
|
|
rc = -ENOMEM;
|
|
if ((cmd = kmalloc(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->len = 8;
|
|
cmd->lun = lun;
|
|
cmd->done = ub_probe_done;
|
|
cmd->back = &compl;
|
|
|
|
spin_lock_irqsave(&sc->lock, flags);
|
|
cmd->tag = sc->tagcnt++;
|
|
|
|
rc = ub_submit_scsi(sc, cmd);
|
|
spin_unlock_irqrestore(&sc->lock, flags);
|
|
|
|
if (rc != 0) {
|
|
printk("ub: reading capacity: submit error (%d)\n", rc); /* P3 */
|
|
goto err_submit;
|
|
}
|
|
|
|
wait_for_completion(&compl);
|
|
|
|
if (cmd->error != 0) {
|
|
printk("ub: reading capacity: error %d\n", cmd->error); /* P3 */
|
|
rc = -EIO;
|
|
goto err_read;
|
|
}
|
|
if (cmd->act_len != 8) {
|
|
printk("ub: reading capacity: size %d\n", cmd->act_len); /* P3 */
|
|
rc = -EIO;
|
|
goto err_read;
|
|
}
|
|
|
|
/* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */
|
|
nsec = be32_to_cpu(*(__be32 *)p) + 1;
|
|
bsize = be32_to_cpu(*(__be32 *)(p + 4));
|
|
switch (bsize) {
|
|
case 512: shift = 0; break;
|
|
case 1024: shift = 1; break;
|
|
case 2048: shift = 2; break;
|
|
case 4096: shift = 3; break;
|
|
default:
|
|
printk("ub: Bad sector size %u\n", bsize); /* P3 */
|
|
rc = -EDOM;
|
|
goto err_inv_bsize;
|
|
}
|
|
|
|
ret->bsize = bsize;
|
|
ret->bshift = shift;
|
|
ret->nsec = nsec << shift;
|
|
rc = 0;
|
|
|
|
err_inv_bsize:
|
|
err_read:
|
|
err_submit:
|
|
kfree(cmd);
|
|
err_alloc:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
*/
|
|
static void ub_probe_urb_complete(struct urb *urb, struct pt_regs *pt)
|
|
{
|
|
struct completion *cop = urb->context;
|
|
complete(cop);
|
|
}
|
|
|
|
static void ub_probe_timeout(unsigned long arg)
|
|
{
|
|
struct completion *cop = (struct completion *) arg;
|
|
complete(cop);
|
|
}
|
|
|
|
/*
|
|
* Get number of LUNs by the way of Bulk GetMaxLUN command.
|
|
*/
|
|
static int ub_sync_getmaxlun(struct ub_dev *sc)
|
|
{
|
|
int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber;
|
|
unsigned char *p;
|
|
enum { ALLOC_SIZE = 1 };
|
|
struct usb_ctrlrequest *cr;
|
|
struct completion compl;
|
|
struct timer_list timer;
|
|
int nluns;
|
|
int rc;
|
|
|
|
init_completion(&compl);
|
|
|
|
rc = -ENOMEM;
|
|
if ((p = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL)
|
|
goto err_alloc;
|
|
*p = 55;
|
|
|
|
cr = &sc->work_cr;
|
|
cr->bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
|
|
cr->bRequest = US_BULK_GET_MAX_LUN;
|
|
cr->wValue = cpu_to_le16(0);
|
|
cr->wIndex = cpu_to_le16(ifnum);
|
|
cr->wLength = cpu_to_le16(1);
|
|
|
|
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",
|
|
sc->name); /* P3 */
|
|
} else {
|
|
printk(KERN_WARNING
|
|
"%s: Unable to submit GetMaxLUN (%d)\n",
|
|
sc->name, rc);
|
|
}
|
|
goto err_submit;
|
|
}
|
|
|
|
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);
|
|
|
|
if (sc->work_urb.actual_length != 1) {
|
|
printk("%s: GetMaxLUN returned %d bytes\n", sc->name,
|
|
sc->work_urb.actual_length); /* P3 */
|
|
nluns = 0;
|
|
} else {
|
|
if ((nluns = *p) == 55) {
|
|
nluns = 0;
|
|
} else {
|
|
/* GetMaxLUN returns the maximum LUN number */
|
|
nluns += 1;
|
|
if (nluns > UB_MAX_LUNS)
|
|
nluns = UB_MAX_LUNS;
|
|
}
|
|
printk("%s: GetMaxLUN returned %d, using %d LUNs\n", sc->name,
|
|
*p, nluns); /* P3 */
|
|
}
|
|
|
|
kfree(p);
|
|
return nluns;
|
|
|
|
err_submit:
|
|
kfree(p);
|
|
err_alloc:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Clear initial stalls.
|
|
*/
|
|
static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe)
|
|
{
|
|
int endp;
|
|
struct usb_ctrlrequest *cr;
|
|
struct completion compl;
|
|
struct timer_list timer;
|
|
int rc;
|
|
|
|
init_completion(&compl);
|
|
|
|
endp = usb_pipeendpoint(stalled_pipe);
|
|
if (usb_pipein (stalled_pipe))
|
|
endp |= USB_DIR_IN;
|
|
|
|
cr = &sc->work_cr;
|
|
cr->bRequestType = USB_RECIP_ENDPOINT;
|
|
cr->bRequest = USB_REQ_CLEAR_FEATURE;
|
|
cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT);
|
|
cr->wIndex = cpu_to_le16(endp);
|
|
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.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) {
|
|
printk(KERN_WARNING
|
|
"%s: Unable to submit a probe clear (%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);
|
|
|
|
/* reset the endpoint toggle */
|
|
usb_settoggle(sc->dev, endp, usb_pipeout(sc->last_pipe), 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get the pipe settings.
|
|
*/
|
|
static int ub_get_pipes(struct ub_dev *sc, struct usb_device *dev,
|
|
struct usb_interface *intf)
|
|
{
|
|
struct usb_host_interface *altsetting = intf->cur_altsetting;
|
|
struct usb_endpoint_descriptor *ep_in = NULL;
|
|
struct usb_endpoint_descriptor *ep_out = NULL;
|
|
struct usb_endpoint_descriptor *ep;
|
|
int i;
|
|
|
|
/*
|
|
* Find the endpoints we need.
|
|
* We are expecting a minimum of 2 endpoints - in and out (bulk).
|
|
* We will ignore any others.
|
|
*/
|
|
for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
|
|
ep = &altsetting->endpoint[i].desc;
|
|
|
|
/* Is it a BULK endpoint? */
|
|
if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
|
|
== USB_ENDPOINT_XFER_BULK) {
|
|
/* BULK in or out? */
|
|
if (ep->bEndpointAddress & USB_DIR_IN)
|
|
ep_in = ep;
|
|
else
|
|
ep_out = ep;
|
|
}
|
|
}
|
|
|
|
if (ep_in == NULL || ep_out == NULL) {
|
|
printk(KERN_NOTICE "%s: failed endpoint check\n",
|
|
sc->name);
|
|
return -EIO;
|
|
}
|
|
|
|
/* Calculate and store the pipe values */
|
|
sc->send_ctrl_pipe = usb_sndctrlpipe(dev, 0);
|
|
sc->recv_ctrl_pipe = usb_rcvctrlpipe(dev, 0);
|
|
sc->send_bulk_pipe = usb_sndbulkpipe(dev,
|
|
ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
|
|
sc->recv_bulk_pipe = usb_rcvbulkpipe(dev,
|
|
ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Probing is done in the process context, which allows us to cheat
|
|
* and not to build a state machine for the discovery.
|
|
*/
|
|
static int ub_probe(struct usb_interface *intf,
|
|
const struct usb_device_id *dev_id)
|
|
{
|
|
struct ub_dev *sc;
|
|
int nluns;
|
|
int rc;
|
|
int i;
|
|
|
|
rc = -ENOMEM;
|
|
if ((sc = kmalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL)
|
|
goto err_core;
|
|
memset(sc, 0, sizeof(struct ub_dev));
|
|
spin_lock_init(&sc->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_timer(&sc->work_timer);
|
|
sc->work_timer.data = (unsigned long) sc;
|
|
sc->work_timer.function = ub_urb_timeout;
|
|
|
|
ub_init_completion(&sc->work_done);
|
|
sc->work_done.done = 1; /* A little yuk, but oh well... */
|
|
|
|
sc->dev = interface_to_usbdev(intf);
|
|
sc->intf = intf;
|
|
// 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? */
|
|
|
|
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;
|
|
|
|
/*
|
|
* At this point, all USB initialization is done, do upper layer.
|
|
* We really hate halfway initialized structures, so from the
|
|
* invariants perspective, this ub_dev is fully constructed at
|
|
* this point.
|
|
*/
|
|
|
|
/*
|
|
* This is needed to clear toggles. It is a problem only if we do
|
|
* `rmmod ub && modprobe ub` without disconnects, but we like that.
|
|
*/
|
|
ub_probe_clear_stall(sc, sc->recv_bulk_pipe);
|
|
ub_probe_clear_stall(sc, sc->send_bulk_pipe);
|
|
|
|
/*
|
|
* The way this is used by the startup code is a little specific.
|
|
* A SCSI check causes a USB stall. Our common case code sees it
|
|
* and clears the check, after which the device is ready for use.
|
|
* But if a check was not present, any command other than
|
|
* TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE).
|
|
*
|
|
* If we neglect to clear the SCSI check, the first real command fails
|
|
* (which is the capacity readout). We clear that and retry, but why
|
|
* causing spurious retries for no reason.
|
|
*
|
|
* Revalidation may start with its own TEST_UNIT_READY, but that one
|
|
* has to succeed, so we clear checks with an additional one here.
|
|
* In any case it's not our business how revaliadation is implemented.
|
|
*/
|
|
for (i = 0; i < 3; i++) { /* Retries for benh's key */
|
|
if ((rc = ub_sync_tur(sc, NULL)) <= 0) break;
|
|
if (rc != 0x6) break;
|
|
msleep(10);
|
|
}
|
|
|
|
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);
|
|
}
|
|
break;
|
|
}
|
|
if (rc != 0) {
|
|
nluns = rc;
|
|
break;
|
|
}
|
|
msleep(100);
|
|
}
|
|
|
|
for (i = 0; i < nluns; i++) {
|
|
ub_probe_lun(sc, i);
|
|
}
|
|
return 0;
|
|
|
|
/* device_remove_file(&sc->intf->dev, &dev_attr_diag); */
|
|
err_diag:
|
|
usb_set_intfdata(intf, NULL);
|
|
// usb_put_intf(sc->intf);
|
|
usb_put_dev(sc->dev);
|
|
kfree(sc);
|
|
err_core:
|
|
return rc;
|
|
}
|
|
|
|
static int ub_probe_lun(struct ub_dev *sc, int lnum)
|
|
{
|
|
struct ub_lun *lun;
|
|
request_queue_t *q;
|
|
struct gendisk *disk;
|
|
int rc;
|
|
|
|
rc = -ENOMEM;
|
|
if ((lun = kmalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL)
|
|
goto err_alloc;
|
|
memset(lun, 0, sizeof(struct ub_lun));
|
|
lun->num = lnum;
|
|
|
|
rc = -ENOSR;
|
|
if ((lun->id = ub_id_get()) == -1)
|
|
goto err_id;
|
|
|
|
lun->udev = sc;
|
|
list_add(&lun->link, &sc->luns);
|
|
|
|
snprintf(lun->name, 16, DRV_NAME "%c(%d.%d.%d)",
|
|
lun->id + 'a', sc->dev->bus->busnum, sc->dev->devnum, lun->num);
|
|
|
|
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)
|
|
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->fops = &ub_bd_fops;
|
|
disk->private_data = lun;
|
|
disk->driverfs_dev = &sc->intf->dev; /* XXX Many to one ok? */
|
|
|
|
rc = -ENOMEM;
|
|
if ((q = blk_init_queue(ub_bd_rq_fn, &sc->lock)) == NULL)
|
|
goto err_blkqinit;
|
|
|
|
disk->queue = q;
|
|
|
|
blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);
|
|
blk_queue_max_hw_segments(q, UB_MAX_REQ_SG);
|
|
blk_queue_max_phys_segments(q, UB_MAX_REQ_SG);
|
|
blk_queue_segment_boundary(q, 0xffffffff); /* Dubious. */
|
|
blk_queue_max_sectors(q, UB_MAX_SECTORS);
|
|
blk_queue_hardsect_size(q, lun->capacity.bsize);
|
|
|
|
q->queuedata = lun;
|
|
|
|
set_capacity(disk, lun->capacity.nsec);
|
|
if (lun->removable)
|
|
disk->flags |= GENHD_FL_REMOVABLE;
|
|
|
|
add_disk(disk);
|
|
|
|
return 0;
|
|
|
|
err_blkqinit:
|
|
put_disk(disk);
|
|
err_diskalloc:
|
|
list_del(&lun->link);
|
|
ub_id_put(lun->id);
|
|
err_id:
|
|
kfree(lun);
|
|
err_alloc:
|
|
return rc;
|
|
}
|
|
|
|
static void ub_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct ub_dev *sc = usb_get_intfdata(intf);
|
|
struct list_head *p;
|
|
struct ub_lun *lun;
|
|
struct gendisk *disk;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* Prevent ub_bd_release from pulling the rug from under us.
|
|
* XXX This is starting to look like a kref.
|
|
* XXX Why not to take this ref at probe time?
|
|
*/
|
|
spin_lock_irqsave(&ub_lock, flags);
|
|
sc->openc++;
|
|
spin_unlock_irqrestore(&ub_lock, flags);
|
|
|
|
/*
|
|
* Fence stall clearnings, operations triggered by unlinkings and so on.
|
|
* We do not attempt to unlink any URBs, because we do not trust the
|
|
* unlink paths in HC drivers. Also, we get -84 upon disconnect anyway.
|
|
*/
|
|
atomic_set(&sc->poison, 1);
|
|
|
|
/*
|
|
* Blow away queued commands.
|
|
*
|
|
* Actually, this never works, because before we get here
|
|
* the HCD terminates outstanding URB(s). It causes our
|
|
* SCSI command queue to advance, commands fail to submit,
|
|
* and the whole queue drains. So, we just use this code to
|
|
* print warnings.
|
|
*/
|
|
spin_lock_irqsave(&sc->lock, flags);
|
|
{
|
|
struct ub_scsi_cmd *cmd;
|
|
int cnt = 0;
|
|
while ((cmd = ub_cmdq_pop(sc)) != NULL) {
|
|
cmd->error = -ENOTCONN;
|
|
cmd->state = UB_CMDST_DONE;
|
|
ub_cmdtr_state(sc, cmd);
|
|
ub_cmdq_pop(sc);
|
|
(*cmd->done)(sc, cmd);
|
|
cnt++;
|
|
}
|
|
if (cnt != 0) {
|
|
printk(KERN_WARNING "%s: "
|
|
"%d was queued after shutdown\n", sc->name, cnt);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&sc->lock, flags);
|
|
|
|
/*
|
|
* Unregister the upper layer.
|
|
*/
|
|
list_for_each (p, &sc->luns) {
|
|
lun = list_entry(p, struct ub_lun, link);
|
|
disk = lun->disk;
|
|
if (disk->flags & GENHD_FL_UP)
|
|
del_gendisk(disk);
|
|
/*
|
|
* I wish I could do:
|
|
* set_bit(QUEUE_FLAG_DEAD, &q->queue_flags);
|
|
* As it is, we rely on our internal poisoning and let
|
|
* the upper levels to spin furiously failing all the I/O.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
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);
|
|
|
|
/*
|
|
* There is virtually no chance that other CPU runs times so long
|
|
* after ub_urb_complete should have called del_timer, but only if HCD
|
|
* didn't forget to deliver a callback on unlink.
|
|
*/
|
|
del_timer_sync(&sc->work_timer);
|
|
|
|
/*
|
|
* At this point there must be no commands coming from anyone
|
|
* 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,
|
|
.id_table = ub_usb_ids,
|
|
};
|
|
|
|
static int __init ub_init(void)
|
|
{
|
|
int rc;
|
|
|
|
/* 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));
|
|
|
|
if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0)
|
|
goto err_regblkdev;
|
|
devfs_mk_dir(DEVFS_NAME);
|
|
|
|
if ((rc = usb_register(&ub_driver)) != 0)
|
|
goto err_register;
|
|
|
|
return 0;
|
|
|
|
err_register:
|
|
devfs_remove(DEVFS_NAME);
|
|
unregister_blkdev(UB_MAJOR, DRV_NAME);
|
|
err_regblkdev:
|
|
return rc;
|
|
}
|
|
|
|
static void __exit ub_exit(void)
|
|
{
|
|
usb_deregister(&ub_driver);
|
|
|
|
devfs_remove(DEVFS_NAME);
|
|
unregister_blkdev(UB_MAJOR, DRV_NAME);
|
|
}
|
|
|
|
module_init(ub_init);
|
|
module_exit(ub_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|