![Pete Zaitcev](/assets/img/avatar_default.png)
Fix a few comments and printk statements. Signed-off-by: Pete Zaitcev <zaitcev@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2491 lines
62 KiB
C
2491 lines
62 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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* -- Return sense now that rq allows it (we always auto-sense anyway).
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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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* -- verify the 13 conditions and do bulk resets
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* -- highmem
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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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* -- Allocate structure for LUN 0 before the first ub_sync_tur, avoid NULL. ?
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* -- prune comments, they are too volumnous
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* -- Resove XXX's
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* -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring.
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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/usb_usual.h>
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#include <linux/blkdev.h>
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#include <linux/timer.h>
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#include <linux/scatterlist.h>
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#include <scsi/scsi.h>
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#define DRV_NAME "ub"
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#define UB_MAJOR 180
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/*
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* The command state machine is the key model for understanding of this driver.
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*
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* The general rule is that all transitions are done towards the bottom
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* of the diagram, thus preventing any loops.
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*
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* An exception to that is how the STAT state is handled. A counter allows it
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* to be re-entered along the path marked with [C].
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*
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* +--------+
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* ! INIT !
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* +--------+
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* !
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* ub_scsi_cmd_start fails ->--------------------------------------\
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* ! !
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* V !
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* +--------+ !
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* ! CMD ! !
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* +--------+ !
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* ! +--------+ !
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* was -EPIPE -->-------------------------------->! CLEAR ! !
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* ! +--------+ !
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* ! ! !
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* was error -->------------------------------------- ! --------->\
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* ! ! !
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* /--<-- cmd->dir == NONE ? ! !
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* ! ! ! !
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* ! V ! !
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* ! +--------+ ! !
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* ! ! DATA ! ! !
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* ! +--------+ ! !
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* ! ! +---------+ ! !
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* ! was -EPIPE -->--------------->! CLR2STS ! ! !
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* ! ! +---------+ ! !
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* ! ! ! ! !
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* ! ! was error -->---- ! --------->\
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* ! was error -->--------------------- ! ------------- ! --------->\
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* ! ! ! ! !
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* ! V ! ! !
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* \--->+--------+ ! ! !
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* ! STAT !<--------------------------/ ! !
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* /--->+--------+ ! !
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* ! ! ! !
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* [C] was -EPIPE -->-----------\ ! !
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* ! ! ! ! !
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* +<---- len == 0 ! ! !
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* ! ! ! ! !
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* ! was error -->--------------------------------------!---------->\
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* ! ! ! ! !
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* +<---- bad CSW ! ! !
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* +<---- bad tag ! ! !
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* ! ! V ! !
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* ! ! +--------+ ! !
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* ! ! ! CLRRS ! ! !
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* ! ! +--------+ ! !
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* ! ! ! ! !
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* \------- ! --------------------[C]--------\ ! !
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* ! ! ! !
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* cmd->error---\ +--------+ ! !
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* ! +--------------->! SENSE !<----------/ !
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* STAT_FAIL----/ +--------+ !
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* ! ! V
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* ! V +--------+
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* \--------------------------------\--------------------->! DONE !
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* +--------+
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*/
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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_PARTS_PER_LUN 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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#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 9 /* cdrecord requires 32KB and maybe a header */
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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_CLRRS, /* Clearing before retrying status */
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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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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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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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unsigned int timeo; /* jiffies until rq->timeout changes */
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unsigned int len; /* Requested length */
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unsigned int current_sg;
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unsigned int nsg; /* sgv[nsg] */
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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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struct ub_request {
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struct request *rq;
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unsigned int current_try;
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unsigned int nsg; /* sgv[nsg] */
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struct scatterlist sgv[UB_MAX_REQ_SG];
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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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* 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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struct ub_request urq;
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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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int reset; /* Reset is running */
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int bad_resid;
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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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__le32 signature; /* Learned signature */
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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 work_struct reset_work;
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wait_queue_head_t reset_wait;
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int sg_stat[6];
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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_request_fn_1(struct ub_lun *lun, struct request *rq);
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static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
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struct ub_scsi_cmd *cmd, struct ub_request *urq);
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static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
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struct ub_scsi_cmd *cmd, struct ub_request *urq);
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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, unsigned int status,
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unsigned int cmd_len);
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static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun,
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struct ub_request *urq, struct ub_scsi_cmd *cmd);
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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);
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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_data_start(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 int __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_stat_counted(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 void ub_reset_enter(struct ub_dev *sc, int try);
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static void ub_reset_task(struct work_struct *work);
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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_sync_reset(struct ub_dev *sc);
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static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe);
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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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#ifdef CONFIG_USB_LIBUSUAL
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#define ub_usb_ids storage_usb_ids
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#else
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static struct usb_device_id ub_usb_ids[] = {
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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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#endif /* CONFIG_USB_LIBUSUAL */
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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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#define UB_QLOCK_NUM 5
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static spinlock_t ub_qlockv[UB_QLOCK_NUM];
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static int ub_qlock_next = 0;
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static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */
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/*
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* The id allocator.
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*
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* This also stores the host for indexing by minor, which is somewhat dirty.
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*/
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static int ub_id_get(void)
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{
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unsigned long flags;
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int i;
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spin_lock_irqsave(&ub_lock, flags);
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for (i = 0; i < UB_MAX_HOSTS; i++) {
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if (ub_hostv[i] == 0) {
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ub_hostv[i] = 1;
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spin_unlock_irqrestore(&ub_lock, flags);
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return i;
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}
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}
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spin_unlock_irqrestore(&ub_lock, flags);
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return -1;
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}
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static void ub_id_put(int id)
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{
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unsigned long flags;
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if (id < 0 || id >= UB_MAX_HOSTS) {
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printk(KERN_ERR DRV_NAME ": bad host ID %d\n", id);
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return;
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}
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spin_lock_irqsave(&ub_lock, flags);
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if (ub_hostv[id] == 0) {
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spin_unlock_irqrestore(&ub_lock, flags);
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printk(KERN_ERR DRV_NAME ": freeing free host ID %d\n", id);
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return;
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}
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ub_hostv[id] = 0;
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spin_unlock_irqrestore(&ub_lock, flags);
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}
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/*
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* This is necessitated by the fact that blk_cleanup_queue does not
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* necesserily destroy the queue. Instead, it may merely decrease q->refcnt.
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* Since our blk_init_queue() passes a spinlock common with ub_dev,
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* we have life time issues when ub_cleanup frees ub_dev.
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*/
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static spinlock_t *ub_next_lock(void)
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{
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unsigned long flags;
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spinlock_t *ret;
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spin_lock_irqsave(&ub_lock, flags);
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ret = &ub_qlockv[ub_qlock_next];
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ub_qlock_next = (ub_qlock_next + 1) % UB_QLOCK_NUM;
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spin_unlock_irqrestore(&ub_lock, flags);
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return ret;
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}
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/*
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* Downcount for deallocation. This rides on two assumptions:
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* - once something is poisoned, its refcount cannot grow
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* - opens cannot happen at this time (del_gendisk was done)
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* If the above is true, we can drop the lock, which we need for
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* blk_cleanup_queue(): the silly thing may attempt to sleep.
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* [Actually, it never needs to sleep for us, but it calls might_sleep()]
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*/
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static void ub_put(struct ub_dev *sc)
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{
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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;
|
|
struct request_queue *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);
|
|
}
|
|
|
|
usb_set_intfdata(sc->intf, NULL);
|
|
usb_put_intf(sc->intf);
|
|
usb_put_dev(sc->dev);
|
|
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_request_fn(struct request_queue *q)
|
|
{
|
|
struct ub_lun *lun = q->queuedata;
|
|
struct request *rq;
|
|
|
|
while ((rq = elv_next_request(q)) != NULL) {
|
|
if (ub_request_fn_1(lun, rq) != 0) {
|
|
blk_stop_queue(q);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
|
|
{
|
|
struct ub_dev *sc = lun->udev;
|
|
struct ub_scsi_cmd *cmd;
|
|
struct ub_request *urq;
|
|
int n_elem;
|
|
|
|
if (atomic_read(&sc->poison)) {
|
|
blkdev_dequeue_request(rq);
|
|
ub_end_rq(rq, DID_NO_CONNECT << 16, blk_rq_bytes(rq));
|
|
return 0;
|
|
}
|
|
|
|
if (lun->changed && !blk_pc_request(rq)) {
|
|
blkdev_dequeue_request(rq);
|
|
ub_end_rq(rq, SAM_STAT_CHECK_CONDITION, blk_rq_bytes(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
|
|
*/
|
|
sg_init_table(&urq->sgv[0], UB_MAX_REQ_SG);
|
|
n_elem = blk_rq_map_sg(lun->disk->queue, rq, &urq->sgv[0]);
|
|
if (n_elem < 0) {
|
|
/* Impossible, because blk_rq_map_sg should not hit ENOMEM. */
|
|
printk(KERN_INFO "%s: failed request map (%d)\n",
|
|
lun->name, n_elem);
|
|
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)) {
|
|
ub_cmd_build_packet(sc, lun, cmd, urq);
|
|
} else {
|
|
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 (ub_submit_scsi(sc, cmd) != 0)
|
|
goto drop;
|
|
|
|
return 0;
|
|
|
|
drop:
|
|
ub_put_cmd(lun, cmd);
|
|
ub_end_rq(rq, DID_ERROR << 16, blk_rq_bytes(rq));
|
|
return 0;
|
|
}
|
|
|
|
static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
|
|
struct ub_scsi_cmd *cmd, struct ub_request *urq)
|
|
{
|
|
struct request *rq = urq->rq;
|
|
unsigned int block, nblks;
|
|
|
|
if (rq_data_dir(rq) == WRITE)
|
|
cmd->dir = UB_DIR_WRITE;
|
|
else
|
|
cmd->dir = UB_DIR_READ;
|
|
|
|
cmd->nsg = urq->nsg;
|
|
memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg);
|
|
|
|
/*
|
|
* 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] = (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[4] = block >> 8;
|
|
cmd->cdb[5] = block;
|
|
cmd->cdb[7] = nblks >> 8;
|
|
cmd->cdb[8] = nblks;
|
|
cmd->cdb_len = 10;
|
|
|
|
cmd->len = rq->nr_sectors * 512;
|
|
}
|
|
|
|
static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
|
|
struct ub_scsi_cmd *cmd, struct ub_request *urq)
|
|
{
|
|
struct request *rq = urq->rq;
|
|
|
|
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->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;
|
|
|
|
/*
|
|
* To reapply this to every URB is not as incorrect as it looks.
|
|
* In return, we avoid any complicated tracking calculations.
|
|
*/
|
|
cmd->timeo = rq->timeout;
|
|
}
|
|
|
|
static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
|
|
{
|
|
struct ub_lun *lun = cmd->lun;
|
|
struct ub_request *urq = cmd->back;
|
|
struct request *rq;
|
|
unsigned int scsi_status;
|
|
unsigned int cmd_len;
|
|
|
|
rq = urq->rq;
|
|
|
|
if (cmd->error == 0) {
|
|
if (blk_pc_request(rq)) {
|
|
if (cmd->act_len >= rq->data_len)
|
|
rq->data_len = 0;
|
|
else
|
|
rq->data_len -= cmd->act_len;
|
|
scsi_status = 0;
|
|
} else {
|
|
if (cmd->act_len != cmd->len) {
|
|
scsi_status = SAM_STAT_CHECK_CONDITION;
|
|
} else {
|
|
scsi_status = 0;
|
|
}
|
|
}
|
|
} else {
|
|
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)
|
|
scsi_status = SAM_STAT_CHECK_CONDITION;
|
|
else
|
|
scsi_status = DID_ERROR << 16;
|
|
} else {
|
|
if (cmd->error == -EIO &&
|
|
(cmd->key == 0 ||
|
|
cmd->key == MEDIUM_ERROR ||
|
|
cmd->key == UNIT_ATTENTION)) {
|
|
if (ub_rw_cmd_retry(sc, lun, urq, cmd) == 0)
|
|
return;
|
|
}
|
|
scsi_status = SAM_STAT_CHECK_CONDITION;
|
|
}
|
|
}
|
|
|
|
urq->rq = NULL;
|
|
|
|
cmd_len = cmd->len;
|
|
ub_put_cmd(lun, cmd);
|
|
ub_end_rq(rq, scsi_status, cmd_len);
|
|
blk_start_queue(lun->disk->queue);
|
|
}
|
|
|
|
static void ub_end_rq(struct request *rq, unsigned int scsi_status,
|
|
unsigned int cmd_len)
|
|
{
|
|
int error;
|
|
long rqlen;
|
|
|
|
if (scsi_status == 0) {
|
|
error = 0;
|
|
} else {
|
|
error = -EIO;
|
|
rq->errors = scsi_status;
|
|
}
|
|
rqlen = blk_rq_bytes(rq); /* Oddly enough, this is the residue. */
|
|
if (__blk_end_request(rq, error, cmd_len)) {
|
|
printk(KERN_WARNING DRV_NAME
|
|
": __blk_end_request blew, %s-cmd total %u rqlen %ld\n",
|
|
blk_pc_request(rq)? "pc": "fs", cmd_len, rqlen);
|
|
}
|
|
}
|
|
|
|
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++;
|
|
|
|
/* Remove this if anyone complains of flooding. */
|
|
printk(KERN_DEBUG "%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);
|
|
|
|
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
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
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);
|
|
|
|
if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) {
|
|
/* XXX Clear stalls */
|
|
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;
|
|
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);
|
|
if (!ub_is_completed(&sc->work_done))
|
|
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 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);
|
|
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 (!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) {
|
|
if ((rc = ub_scsi_cmd_start(sc, cmd)) == 0)
|
|
break;
|
|
cmd->error = rc;
|
|
cmd->state = UB_CMDST_DONE;
|
|
} else {
|
|
if (!ub_is_completed(&sc->work_done))
|
|
break;
|
|
del_timer(&sc->work_timer);
|
|
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 len;
|
|
int rc;
|
|
|
|
if (atomic_read(&sc->poison)) {
|
|
ub_state_done(sc, cmd, -ENODEV);
|
|
return;
|
|
}
|
|
|
|
if (cmd->state == UB_CMDST_CLEAR) {
|
|
if (urb->status == -EPIPE) {
|
|
/*
|
|
* STALL while clearning STALL.
|
|
* The control pipe clears itself - nothing to do.
|
|
*/
|
|
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) {
|
|
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_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: "
|
|
"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...
|
|
*/
|
|
ub_state_done(sc, cmd, rc);
|
|
return;
|
|
}
|
|
cmd->state = UB_CMDST_CLEAR;
|
|
return;
|
|
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) {
|
|
goto Bad_End;
|
|
}
|
|
|
|
if (cmd->dir == UB_DIR_NONE || cmd->nsg < 1) {
|
|
ub_state_stat(sc, cmd);
|
|
return;
|
|
}
|
|
|
|
// udelay(125); // usb-storage has this
|
|
ub_data_start(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);
|
|
ub_state_done(sc, cmd, rc);
|
|
return;
|
|
}
|
|
cmd->state = UB_CMDST_CLR2STS;
|
|
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)
|
|
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;
|
|
|
|
if (++cmd->current_sg < cmd->nsg) {
|
|
ub_data_start(sc, cmd);
|
|
return;
|
|
}
|
|
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);
|
|
ub_state_done(sc, cmd, rc);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
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;
|
|
|
|
if (sc->signature == cpu_to_le32(0)) {
|
|
/*
|
|
* 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.
|
|
*/
|
|
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;
|
|
}
|
|
}
|
|
|
|
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.
|
|
*/
|
|
ub_state_stat_counted(sc, cmd);
|
|
return;
|
|
}
|
|
|
|
if (!sc->bad_resid) {
|
|
len = le32_to_cpu(bcs->Residue);
|
|
if (len != cmd->len - cmd->act_len) {
|
|
/*
|
|
* Only start ignoring if this cmd ended well.
|
|
*/
|
|
if (cmd->len == cmd->act_len) {
|
|
printk(KERN_NOTICE "%s: "
|
|
"bad residual %d of %d, ignoring\n",
|
|
sc->name, len, cmd->len);
|
|
sc->bad_resid = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
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:
|
|
goto Bad_End;
|
|
default:
|
|
printk(KERN_INFO "%s: unknown CSW status 0x%x\n",
|
|
sc->name, bcs->Status);
|
|
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_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);
|
|
ub_state_done(sc, cmd, -EINVAL);
|
|
return;
|
|
}
|
|
return;
|
|
|
|
Bad_End: /* Little Excel is dead */
|
|
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, sg_virt(sg),
|
|
sg->length, ub_urb_complete, sc);
|
|
|
|
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;
|
|
}
|
|
|
|
if (cmd->timeo)
|
|
sc->work_timer.expires = jiffies + cmd->timeo;
|
|
else
|
|
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.
|
|
*/
|
|
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_cmdq_pop(sc);
|
|
(*cmd->done)(sc, cmd);
|
|
}
|
|
|
|
/*
|
|
* Factorization helper for the command state machine:
|
|
* Submit a CSW read.
|
|
*/
|
|
static int __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);
|
|
|
|
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 -1;
|
|
}
|
|
|
|
if (cmd->timeo)
|
|
sc->work_timer.expires = jiffies + cmd->timeo;
|
|
else
|
|
sc->work_timer.expires = jiffies + UB_STAT_TIMEOUT;
|
|
add_timer(&sc->work_timer);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
|
|
if (__ub_state_stat(sc, cmd) != 0)
|
|
return;
|
|
|
|
cmd->stat_count = 0;
|
|
cmd->state = UB_CMDST_STAT;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
struct scatterlist *sg;
|
|
int rc;
|
|
|
|
if (cmd->cdb[0] == REQUEST_SENSE) {
|
|
rc = -EPIPE;
|
|
goto error;
|
|
}
|
|
|
|
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->nsg = 1;
|
|
sg = &scmd->sgv[0];
|
|
sg_init_table(sg, UB_MAX_REQ_SG);
|
|
sg_set_page(sg, virt_to_page(sc->top_sense), UB_SENSE_SIZE,
|
|
(unsigned long)sc->top_sense & (PAGE_SIZE-1));
|
|
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_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);
|
|
|
|
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 = sc->top_sense;
|
|
struct ub_scsi_cmd *cmd;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* 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 ub_lun *lun;
|
|
list_for_each_entry(lun, &sc->luns, link) {
|
|
blk_stop_queue(lun->disk->queue);
|
|
}
|
|
#endif
|
|
|
|
schedule_work(&sc->reset_work);
|
|
}
|
|
|
|
static void ub_reset_task(struct work_struct *work)
|
|
{
|
|
struct ub_dev *sc = container_of(work, struct ub_dev, reset_work);
|
|
unsigned long flags;
|
|
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)) {
|
|
;
|
|
} 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) {
|
|
;
|
|
} 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_entry(lun, &sc->luns, 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.
|
|
*/
|
|
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 = disk->private_data;
|
|
struct ub_dev *sc = lun->udev;
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
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);
|
|
|
|
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->queue, disk, cmd, usermem);
|
|
}
|
|
|
|
/*
|
|
* This is called by check_disk_change if we reported a media change.
|
|
* 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 = kzalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL)
|
|
goto err_alloc;
|
|
|
|
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)
|
|
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;
|
|
struct scatterlist *sg;
|
|
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 = kzalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL)
|
|
goto err_alloc;
|
|
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->nsg = 1;
|
|
sg = &cmd->sgv[0];
|
|
sg_init_table(sg, UB_MAX_REQ_SG);
|
|
sg_set_page(sg, virt_to_page(p), 8, (unsigned long)p & (PAGE_SIZE-1));
|
|
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)
|
|
goto err_submit;
|
|
|
|
wait_for_completion(&compl);
|
|
|
|
if (cmd->error != 0) {
|
|
rc = -EIO;
|
|
goto err_read;
|
|
}
|
|
if (cmd->act_len != 8) {
|
|
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:
|
|
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 completion *cop = urb->context;
|
|
complete(cop);
|
|
}
|
|
|
|
static void ub_probe_timeout(unsigned long arg)
|
|
{
|
|
struct completion *cop = (struct completion *) arg;
|
|
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);
|
|
|
|
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.
|
|
*/
|
|
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);
|
|
|
|
if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0)
|
|
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 ((rc = sc->work_urb.status) < 0)
|
|
goto err_io;
|
|
|
|
if (sc->work_urb.actual_length != 1) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
kfree(p);
|
|
return nluns;
|
|
|
|
err_io:
|
|
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);
|
|
|
|
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) {
|
|
if (ep_in == NULL)
|
|
ep_in = ep;
|
|
} else {
|
|
if (ep_out == NULL)
|
|
ep_out = ep;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ep_in == NULL || ep_out == NULL) {
|
|
printk(KERN_NOTICE "%s: failed endpoint check\n", sc->name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
if (usb_usual_check_type(dev_id, USB_US_TYPE_UB))
|
|
return -ENXIO;
|
|
|
|
rc = -ENOMEM;
|
|
if ((sc = kzalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL)
|
|
goto err_core;
|
|
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);
|
|
init_waitqueue_head(&sc->reset_wait);
|
|
|
|
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);
|
|
/*
|
|
* 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) */
|
|
|
|
if (ub_get_pipes(sc, sc->dev, intf) != 0)
|
|
goto err_dev_desc;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
#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.
|
|
* 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 the schwag key from KS'04 */
|
|
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)
|
|
break;
|
|
if (rc != 0) {
|
|
nluns = rc;
|
|
break;
|
|
}
|
|
msleep(100);
|
|
}
|
|
|
|
for (i = 0; i < nluns; i++) {
|
|
ub_probe_lun(sc, i);
|
|
}
|
|
return 0;
|
|
|
|
err_dev_desc:
|
|
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;
|
|
struct request_queue *q;
|
|
struct gendisk *disk;
|
|
int rc;
|
|
|
|
rc = -ENOMEM;
|
|
if ((lun = kzalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL)
|
|
goto err_alloc;
|
|
lun->num = lnum;
|
|
|
|
rc = -ENOSR;
|
|
if ((lun->id = ub_id_get()) == -1)
|
|
goto err_id;
|
|
|
|
lun->udev = sc;
|
|
|
|
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 */
|
|
ub_revalidate(sc, lun);
|
|
|
|
rc = -ENOMEM;
|
|
if ((disk = alloc_disk(UB_PARTS_PER_LUN)) == NULL)
|
|
goto err_diskalloc;
|
|
|
|
sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a');
|
|
disk->major = UB_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;
|
|
|
|
rc = -ENOMEM;
|
|
if ((q = blk_init_queue(ub_request_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);
|
|
|
|
lun->disk = disk;
|
|
q->queuedata = lun;
|
|
list_add(&lun->link, &sc->luns);
|
|
|
|
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:
|
|
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 ub_lun *lun;
|
|
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 clearings, 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);
|
|
|
|
/*
|
|
* Wait for reset to end, if any.
|
|
*/
|
|
wait_event(sc->reset_wait, !sc->reset);
|
|
|
|
/*
|
|
* 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_peek(sc)) != NULL) {
|
|
cmd->error = -ENOTCONN;
|
|
cmd->state = UB_CMDST_DONE;
|
|
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_entry(lun, &sc->luns, link) {
|
|
del_gendisk(lun->disk);
|
|
/*
|
|
* I wish I could do:
|
|
* queue_flag_set(QUEUE_FLAG_DEAD, q);
|
|
* As it is, we rely on our internal poisoning and let
|
|
* the upper levels to spin furiously failing all the I/O.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* 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 a timeout 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.
|
|
*/
|
|
|
|
ub_put(sc);
|
|
}
|
|
|
|
static struct usb_driver ub_driver = {
|
|
.name = "ub",
|
|
.probe = ub_probe,
|
|
.disconnect = ub_disconnect,
|
|
.id_table = ub_usb_ids,
|
|
};
|
|
|
|
static int __init ub_init(void)
|
|
{
|
|
int rc;
|
|
int i;
|
|
|
|
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:
|
|
unregister_blkdev(UB_MAJOR, DRV_NAME);
|
|
err_regblkdev:
|
|
return rc;
|
|
}
|
|
|
|
static void __exit ub_exit(void)
|
|
{
|
|
usb_deregister(&ub_driver);
|
|
|
|
unregister_blkdev(UB_MAJOR, DRV_NAME);
|
|
usb_usual_clear_present(USB_US_TYPE_UB);
|
|
}
|
|
|
|
module_init(ub_init);
|
|
module_exit(ub_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|