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/*
* History:
* Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
* to allow user process control of SCSI devices.
* Development Sponsored by Killy Corp. NY NY
*
* Original driver (sg.c):
* Copyright (C) 1992 Lawrence Foard
* Version 2 and 3 extensions to driver:
* Copyright (C) 1998 - 2001 Douglas Gilbert
*
* Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
*/
#include <linux/config.h>
#ifdef CONFIG_PROC_FS
static char sg_version_str[] = "Version: 3.1.22 (20011208)";
#endif
static int sg_version_num = 30122; /* 2 digits for each component */
/*
* D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
* - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
* the kernel/module needs to be built with CONFIG_SCSI_LOGGING
* (otherwise the macros compile to empty statements).
* Then before running the program to be debugged enter:
* # echo "scsi log timeout 7" > /proc/scsi/scsi
* This will send copious output to the console and the log which
* is usually /var/log/messages. To turn off debugging enter:
* # echo "scsi log timeout 0" > /proc/scsi/scsi
* The 'timeout' token was chosen because it is relatively unused.
* The token 'hlcomplete' should be used but that triggers too
* much output from the sd device driver. To dump the current
* state of the SCSI mid level data structures enter:
* # echo "scsi dump 1" > /proc/scsi/scsi
* To dump the state of sg's data structures use:
* # cat /proc/scsi/sg/debug
*
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/mtio.h>
#include <linux/ioctl.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/smp_lock.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/blk.h>
#include "scsi.h"
#include "hosts.h"
#include <scsi/scsi_ioctl.h>
#include <scsi/sg.h>
#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
static int sg_proc_init(void);
static void sg_proc_cleanup(void);
#endif
#ifndef LINUX_VERSION_CODE
#include <linux/version.h>
#endif /* LINUX_VERSION_CODE */
#define SG_ALLOW_DIO_DEF 0
#define SG_ALLOW_DIO_CODE /* compile out be commenting this define */
#ifdef SG_ALLOW_DIO_CODE
#include <linux/iobuf.h>
#endif
#define SG_NEW_KIOVEC 0 /* use alloc_kiovec(), not alloc_kiovec_sz() */
int sg_big_buff = SG_DEF_RESERVED_SIZE;
/* N.B. This variable is readable and writeable via
/proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
of this size (or less if there is not enough memory) will be reserved
for use by this file descriptor. [Deprecated usage: this variable is also
readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
the kernel (i.e. it is not a module).] */
static int def_reserved_size = -1; /* picks up init parameter */
static int sg_allow_dio = SG_ALLOW_DIO_DEF;
#define SG_SECTOR_SZ 512
#define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
#define SG_LOW_POOL_THRESHHOLD 30
#define SG_MAX_POOL_SECTORS 320 /* Max. number of pool sectors to take */
static int sg_pool_secs_avail = SG_MAX_POOL_SECTORS;
#define SG_HEAP_PAGE 1 /* heap from kernel via get_free_pages() */
#define SG_HEAP_KMAL 2 /* heap from kernel via kmalloc() */
#define SG_HEAP_POOL 3 /* heap from scsi dma pool (mid-level) */
#define SG_USER_MEM 4 /* memory belongs to user space */
#define SG_DEV_ARR_LUMP 6 /* amount to over allocate sg_dev_arr by */
static int sg_init(void);
static int sg_attach(Scsi_Device *);
static void sg_finish(void);
static int sg_detect(Scsi_Device *);
static void sg_detach(Scsi_Device *);
static Scsi_Request * dummy_cmdp; /* only used for sizeof */
static rwlock_t sg_dev_arr_lock = RW_LOCK_UNLOCKED; /* Also used to lock
file descriptor list for device */
static struct Scsi_Device_Template sg_template =
{
tag:"sg",
scsi_type:0xff,
major:SCSI_GENERIC_MAJOR,
detect:sg_detect,
init:sg_init,
finish:sg_finish,
attach:sg_attach,
detach:sg_detach
};
typedef struct sg_scatter_hold /* holding area for scsi scatter gather info */
{
unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
unsigned bufflen; /* Size of (aggregate) data buffer */
unsigned b_malloc_len; /* actual len malloc'ed in buffer */
void * buffer; /* Data buffer or scatter list + mem_src_arr */
struct kiobuf * kiobp; /* for direct IO information */
char mapped; /* indicates kiobp has locked pages */
char buffer_mem_src; /* heap whereabouts of 'buffer' */
unsigned char cmd_opcode; /* first byte of command */
} Sg_scatter_hold; /* 24 bytes long on i386 */
struct sg_device; /* forward declarations */
struct sg_fd;
typedef struct sg_request /* SG_MAX_QUEUE requests outstanding per file */
{
Scsi_Request * my_cmdp; /* != 0 when request with lower levels */
struct sg_request * nextrp; /* NULL -> tail request (slist) */
struct sg_fd * parentfp; /* NULL -> not in use */
Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
unsigned char sense_b[sizeof(dummy_cmdp->sr_sense_buffer)];
char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
char orphan; /* 1 -> drop on sight, 0 -> normal */
char sg_io_owned; /* 1 -> packet belongs to SG_IO */
volatile char done; /* 0->before bh, 1->before read, 2->read */
} Sg_request; /* 168 bytes long on i386 */
typedef struct sg_fd /* holds the state of a file descriptor */
{
struct sg_fd * nextfp; /* NULL when last opened fd on this device */
struct sg_device * parentdp; /* owning device */
wait_queue_head_t read_wait; /* queue read until command done */
rwlock_t rq_list_lock; /* protect access to list in req_arr */
int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
Sg_scatter_hold reserve; /* buffer held for this file descriptor */
unsigned save_scat_len; /* original length of trunc. scat. element */
Sg_request * headrp; /* head of request slist, NULL->empty */
struct fasync_struct * async_qp; /* used by asynchronous notification */
Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
char low_dma; /* as in parent but possibly overridden to 1 */
char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
volatile char closed; /* 1 -> fd closed but request(s) outstanding */
char fd_mem_src; /* heap whereabouts of this Sg_fd object */
char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
char mmap_called; /* 0 -> mmap() never called on this fd */
} Sg_fd; /* 2760 bytes long on i386 */
typedef struct sg_device /* holds the state of each scsi generic device */
{
Scsi_Device * device;
wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
int sg_tablesize; /* adapter's max scatter-gather table size */
Sg_fd * headfp; /* first open fd belonging to this device */
devfs_handle_t de;
kdev_t i_rdev; /* holds device major+minor number */
volatile char detached; /* 0->attached, 1->detached pending removal */
volatile char exclude; /* opened for exclusive access */
char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
} Sg_device; /* 36 bytes long on i386 */
static int sg_fasync(int fd, struct file * filp, int mode);
static void sg_cmd_done_bh(Scsi_Cmnd * SCpnt);
static int sg_start_req(Sg_request * srp);
static void sg_finish_rem_req(Sg_request * srp);
static int sg_build_indi(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
int tablesize);
static ssize_t sg_new_read(Sg_fd * sfp, char * buf, size_t count,
Sg_request * srp);
static ssize_t sg_new_write(Sg_fd * sfp, const char * buf, size_t count,
int blocking, int read_only, Sg_request ** o_srp);
static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
unsigned char * cmnd, int timeout, int blocking);
static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
int wr_xf, int * countp, unsigned char ** up);
static int sg_write_xfer(Sg_request * srp);
static int sg_read_xfer(Sg_request * srp);
static void sg_read_oxfer(Sg_request * srp, char * outp, int num_read_xfer);
static void sg_remove_scat(Sg_scatter_hold * schp);
static char * sg_get_sgat_msa(Sg_scatter_hold * schp);
static void sg_build_reserve(Sg_fd * sfp, int req_size);
static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
static char * sg_malloc(const Sg_fd * sfp, int size, int * retSzp,
int * mem_srcp);
static void sg_free(char * buff, int size, int mem_src);
static char * sg_low_malloc(int rqSz, int lowDma, int mem_src,
int * retSzp);
static void sg_low_free(char * buff, int size, int mem_src);
static Sg_fd * sg_add_sfp(Sg_device * sdp, int dev);
static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
static Sg_request * sg_get_rq_mark(Sg_fd * sfp, int pack_id);
static Sg_request * sg_add_request(Sg_fd * sfp);
static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
static int sg_res_in_use(Sg_fd * sfp);
static int sg_ms_to_jif(unsigned int msecs);
static inline unsigned sg_jif_to_ms(int jifs);
static int sg_allow_access(unsigned char opcode, char dev_type);
static int sg_build_dir(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
static void sg_unmap_and(Sg_scatter_hold * schp, int free_also);
static Sg_device * sg_get_dev(int dev);
static inline int sg_alloc_kiovec(int nr, struct kiobuf **bufp, int *szp);
static inline void sg_free_kiovec(int nr, struct kiobuf **bufp, int *szp);
#ifdef CONFIG_PROC_FS
static int sg_last_dev(void);
#endif
static Sg_device ** sg_dev_arr = NULL;
#define SZ_SG_HEADER sizeof(struct sg_header)
#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
#define SZ_SG_IOVEC sizeof(sg_iovec_t)
#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
static int sg_open(struct inode * inode, struct file * filp)
{
int dev = MINOR(inode->i_rdev);
int flags = filp->f_flags;
Sg_device * sdp;
Sg_fd * sfp;
int res;
int retval = -EBUSY;
SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
sdp = sg_get_dev(dev);
if ((! sdp) || (! sdp->device))
return -ENXIO;
if (sdp->detached)
return -ENODEV;
/* This driver's module count bumped by fops_get in <linux/fs.h> */
/* Prevent the device driver from vanishing while we sleep */
if (sdp->device->host->hostt->module)
__MOD_INC_USE_COUNT(sdp->device->host->hostt->module);
sdp->device->access_count++;
if (! ((flags & O_NONBLOCK) ||
scsi_block_when_processing_errors(sdp->device))) {
retval = -ENXIO;
/* we are in error recovery for this device */
goto error_out;
}
if (flags & O_EXCL) {
if (O_RDONLY == (flags & O_ACCMODE)) {
retval = -EACCES; /* Can't lock it with read only access */
goto error_out;
}
if (sdp->headfp && (flags & O_NONBLOCK))
goto error_out;
res = 0;
__wait_event_interruptible(sdp->o_excl_wait,
((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)),
res);
if (res) {
retval = res; /* -ERESTARTSYS because signal hit process */
goto error_out;
}
}
else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
if (flags & O_NONBLOCK)
goto error_out;
res = 0;
__wait_event_interruptible(sdp->o_excl_wait, (! sdp->exclude), res);
if (res) {
retval = res; /* -ERESTARTSYS because signal hit process */
goto error_out;
}
}
if (sdp->detached) {
retval = -ENODEV;
goto error_out;
}
if (! sdp->headfp) { /* no existing opens on this device */
sdp->sgdebug = 0;
sdp->sg_tablesize = sdp->device->host->sg_tablesize;
}
if ((sfp = sg_add_sfp(sdp, dev)))
filp->private_data = sfp;
else {
if (flags & O_EXCL) sdp->exclude = 0; /* undo if error */
retval = -ENOMEM;
goto error_out;
}
return 0;
error_out:
sdp->device->access_count--;
if ((! sdp->detached) && sdp->device->host->hostt->module)
__MOD_DEC_USE_COUNT(sdp->device->host->hostt->module);
return retval;
}
/* Following function was formerly called 'sg_close' */
static int sg_release(struct inode * inode, struct file * filp)
{
Sg_device * sdp;
Sg_fd * sfp;
lock_kernel();
if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp))) {
unlock_kernel();
return -ENXIO;
}
SCSI_LOG_TIMEOUT(3, printk("sg_release: dev=%d\n", MINOR(sdp->i_rdev)));
sg_fasync(-1, filp, 0); /* remove filp from async notification list */
if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
if (! sdp->detached) {
sdp->device->access_count--;
if (sdp->device->host->hostt->module)
__MOD_DEC_USE_COUNT(sdp->device->host->hostt->module);
}
sdp->exclude = 0;
wake_up_interruptible(&sdp->o_excl_wait);
}
unlock_kernel();
return 0;
}
static ssize_t sg_read(struct file * filp, char * buf,
size_t count, loff_t *ppos)
{
int k, res;
Sg_device * sdp;
Sg_fd * sfp;
Sg_request * srp;
int req_pack_id = -1;
struct sg_header old_hdr;
sg_io_hdr_t new_hdr;
sg_io_hdr_t * hp;
if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp)))
return -ENXIO;
SCSI_LOG_TIMEOUT(3, printk("sg_read: dev=%d, count=%d\n",
MINOR(sdp->i_rdev), (int)count));
if (ppos != &filp->f_pos)
; /* FIXME: Hmm. Seek to the right place, or fail? */
if ((k = verify_area(VERIFY_WRITE, buf, count)))
return k;
if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
__copy_from_user(&old_hdr, buf, SZ_SG_HEADER);
if (old_hdr.reply_len < 0) {
if (count >= SZ_SG_IO_HDR) {
__copy_from_user(&new_hdr, buf, SZ_SG_IO_HDR);
req_pack_id = new_hdr.pack_id;
}
}
else
req_pack_id = old_hdr.pack_id;
}
srp = sg_get_rq_mark(sfp, req_pack_id);
if (! srp) { /* now wait on packet to arrive */
if (sdp->detached)
return -ENODEV;
if (filp->f_flags & O_NONBLOCK)
return -EAGAIN;
while (1) {
res = 0; /* following is a macro that beats race condition */
__wait_event_interruptible(sfp->read_wait, (sdp->detached ||
(srp = sg_get_rq_mark(sfp, req_pack_id))), res);
if (sdp->detached)
return -ENODEV;
if (0 == res)
break;
return res; /* -ERESTARTSYS because signal hit process */
}
}
if (srp->header.interface_id != '\0')
return sg_new_read(sfp, buf, count, srp);
hp = &srp->header;
memset(&old_hdr, 0, SZ_SG_HEADER);
old_hdr.reply_len = (int)hp->timeout;
old_hdr.pack_len = old_hdr.reply_len; /* very old, strange behaviour */
old_hdr.pack_id = hp->pack_id;
old_hdr.twelve_byte =
((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
old_hdr.target_status = hp->masked_status;
old_hdr.host_status = hp->host_status;
old_hdr.driver_status = hp->driver_status;
if ((CHECK_CONDITION & hp->masked_status) ||
(DRIVER_SENSE & hp->driver_status))
memcpy(old_hdr.sense_buffer, srp->sense_b,
sizeof(old_hdr.sense_buffer));
switch (hp->host_status)
{ /* This setup of 'result' is for backward compatibility and is best
ignored by the user who should use target, host + driver status */
case DID_OK:
case DID_PASSTHROUGH:
case DID_SOFT_ERROR:
old_hdr.result = 0;
break;
case DID_NO_CONNECT:
case DID_BUS_BUSY:
case DID_TIME_OUT:
old_hdr.result = EBUSY;
break;
case DID_BAD_TARGET:
case DID_ABORT:
case DID_PARITY:
case DID_RESET:
case DID_BAD_INTR:
old_hdr.result = EIO;
break;
case DID_ERROR:
old_hdr.result =
(srp->sense_b[0] == 0 && hp->masked_status == GOOD) ? 0 : EIO;
break;
default:
old_hdr.result = EIO;
break;
}
/* Now copy the result back to the user buffer. */
if (count >= SZ_SG_HEADER) {
__copy_to_user(buf, &old_hdr, SZ_SG_HEADER);
buf += SZ_SG_HEADER;
if (count > old_hdr.reply_len)
count = old_hdr.reply_len;
if (count > SZ_SG_HEADER)
sg_read_oxfer(srp, buf, count - SZ_SG_HEADER);
}
else
count = (old_hdr.result == 0) ? 0 : -EIO;
sg_finish_rem_req(srp);
return count;
}
static ssize_t sg_new_read(Sg_fd * sfp, char * buf, size_t count,
Sg_request * srp)
{
sg_io_hdr_t * hp = &srp->header;
int err = 0;
int len;
if (count < SZ_SG_IO_HDR) {
err = -EINVAL;
goto err_out;
}
hp->sb_len_wr = 0;
if ((hp->mx_sb_len > 0) && hp->sbp) {
if ((CHECK_CONDITION & hp->masked_status) ||
(DRIVER_SENSE & hp->driver_status)) {
int sb_len = sizeof(dummy_cmdp->sr_sense_buffer);
sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
len = 8 + (int)srp->sense_b[7]; /* Additional sense length field */
len = (len > sb_len) ? sb_len : len;
if ((err = verify_area(VERIFY_WRITE, hp->sbp, len)))
goto err_out;
__copy_to_user(hp->sbp, srp->sense_b, len);
hp->sb_len_wr = len;
}
}
if (hp->masked_status || hp->host_status || hp->driver_status)
hp->info |= SG_INFO_CHECK;
copy_to_user(buf, hp, SZ_SG_IO_HDR);
err = sg_read_xfer(srp);
err_out:
sg_finish_rem_req(srp);
return (0 == err) ? count : err;
}
static ssize_t sg_write(struct file * filp, const char * buf,
size_t count, loff_t *ppos)
{
int mxsize, cmd_size, k;
int input_size, blocking;
unsigned char opcode;
Sg_device * sdp;
Sg_fd * sfp;
Sg_request * srp;
struct sg_header old_hdr;
sg_io_hdr_t * hp;
unsigned char cmnd[sizeof(dummy_cmdp->sr_cmnd)];
if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp)))
return -ENXIO;
SCSI_LOG_TIMEOUT(3, printk("sg_write: dev=%d, count=%d\n",
MINOR(sdp->i_rdev), (int)count));
if (sdp->detached)
return -ENODEV;
if (! ((filp->f_flags & O_NONBLOCK) ||
scsi_block_when_processing_errors(sdp->device)))
return -ENXIO;
if (ppos != &filp->f_pos)
; /* FIXME: Hmm. Seek to the right place, or fail? */
if ((k = verify_area(VERIFY_READ, buf, count)))
return k; /* protects following copy_from_user()s + get_user()s */
if (count < SZ_SG_HEADER)
return -EIO;
__copy_from_user(&old_hdr, buf, SZ_SG_HEADER);
blocking = !(filp->f_flags & O_NONBLOCK);
if (old_hdr.reply_len < 0)
return sg_new_write(sfp, buf, count, blocking, 0, NULL);
if (count < (SZ_SG_HEADER + 6))
return -EIO; /* The minimum scsi command length is 6 bytes. */
if (! (srp = sg_add_request(sfp))) {
SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
return -EDOM;
}
buf += SZ_SG_HEADER;
__get_user(opcode, buf);
if (sfp->next_cmd_len > 0) {
if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
sfp->next_cmd_len = 0;
sg_remove_request(sfp, srp);
return -EIO;
}
cmd_size = sfp->next_cmd_len;
sfp->next_cmd_len = 0; /* reset so only this write() effected */
}
else {
cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
if ((opcode >= 0xc0) && old_hdr.twelve_byte)
cmd_size = 12;
}
SCSI_LOG_TIMEOUT(4, printk("sg_write: scsi opcode=0x%02x, cmd_size=%d\n",
(int)opcode, cmd_size));
/* Determine buffer size. */
input_size = count - cmd_size;
mxsize = (input_size > old_hdr.reply_len) ? input_size :
old_hdr.reply_len;
mxsize -= SZ_SG_HEADER;
input_size -= SZ_SG_HEADER;
if (input_size < 0) {
sg_remove_request(sfp, srp);
return -EIO; /* User did not pass enough bytes for this command. */
}
hp = &srp->header;
hp->interface_id = '\0'; /* indicator of old interface tunnelled */
hp->cmd_len = (unsigned char)cmd_size;
hp->iovec_count = 0;
hp->mx_sb_len = 0;
if (input_size > 0)
hp->dxfer_direction = ((old_hdr.reply_len - SZ_SG_HEADER) > 0) ?
SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
else
hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV :
SG_DXFER_NONE;
hp->dxfer_len = mxsize;
hp->dxferp = (unsigned char *)buf + cmd_size;
hp->sbp = NULL;
hp->timeout = old_hdr.reply_len; /* structure abuse ... */
hp->flags = input_size; /* structure abuse ... */
hp->pack_id = old_hdr.pack_id;
hp->usr_ptr = NULL;
__copy_from_user(cmnd, buf, cmd_size);
k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
return (k < 0) ? k : count;
}
static ssize_t sg_new_write(Sg_fd * sfp, const char * buf, size_t count,
int blocking, int read_only, Sg_request ** o_srp)
{
int k;
Sg_request * srp;
sg_io_hdr_t * hp;
unsigned char cmnd[sizeof(dummy_cmdp->sr_cmnd)];
int timeout;
if (count < SZ_SG_IO_HDR)
return -EINVAL;
if ((k = verify_area(VERIFY_READ, buf, count)))
return k; /* protects following copy_from_user()s + get_user()s */
sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
if (! (srp = sg_add_request(sfp))) {
SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
return -EDOM;
}
hp = &srp->header;
__copy_from_user(hp, buf, SZ_SG_IO_HDR);
if (hp->interface_id != 'S') {
sg_remove_request(sfp, srp);
return -ENOSYS;
}
if (hp->flags & SG_FLAG_MMAP_IO) {
if (hp->dxfer_len > sfp->reserve.bufflen) {
sg_remove_request(sfp, srp);
return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
}
if (hp->flags & SG_FLAG_DIRECT_IO) {
sg_remove_request(sfp, srp);
return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
}
if (sg_res_in_use(sfp)) {
sg_remove_request(sfp, srp);
return -EBUSY; /* reserve buffer already being used */
}
}
timeout = sg_ms_to_jif(srp->header.timeout);
if ((! hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof(cmnd))) {
sg_remove_request(sfp, srp);
return -EMSGSIZE;
}
if ((k = verify_area(VERIFY_READ, hp->cmdp, hp->cmd_len))) {
sg_remove_request(sfp, srp);
return k; /* protects following copy_from_user()s + get_user()s */
}
__copy_from_user(cmnd, hp->cmdp, hp->cmd_len);
if (read_only &&
(! sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
sg_remove_request(sfp, srp);
return -EACCES;
}
k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
if (k < 0) return k;
if (o_srp) *o_srp = srp;
return count;
}
static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
unsigned char * cmnd, int timeout, int blocking)
{
int k;
Scsi_Request * SRpnt;
Sg_device * sdp = sfp->parentdp;
sg_io_hdr_t * hp = &srp->header;
request_queue_t * q;
srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
hp->status = 0;
hp->masked_status = 0;
hp->msg_status = 0;
hp->info = 0;
hp->host_status = 0;
hp->driver_status = 0;
hp->resid = 0;
SCSI_LOG_TIMEOUT(4,
printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
(int)cmnd[0], (int)hp->cmd_len));
if ((k = sg_start_req(srp))) {
SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
sg_finish_rem_req(srp);
return k; /* probably out of space --> ENOMEM */
}
if ((k = sg_write_xfer(srp))) {
SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
sg_finish_rem_req(srp);
return k;
}
if (sdp->detached) {
sg_finish_rem_req(srp);
return -ENODEV;
}
SRpnt = scsi_allocate_request(sdp->device);
if(SRpnt == NULL) {
SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
sg_finish_rem_req(srp);
return -ENOMEM;
}
srp->my_cmdp = SRpnt;
q = &SRpnt->sr_device->request_queue;
SRpnt->sr_request.rq_dev = sdp->i_rdev;
SRpnt->sr_request.rq_status = RQ_ACTIVE;
SRpnt->sr_sense_buffer[0] = 0;
SRpnt->sr_cmd_len = hp->cmd_len;
if (! (hp->flags & SG_FLAG_LUN_INHIBIT)) {
if (sdp->device->scsi_level <= SCSI_2)
cmnd[1] = (cmnd[1] & 0x1f) | (sdp->device->lun << 5);
}
SRpnt->sr_use_sg = srp->data.k_use_sg;
SRpnt->sr_sglist_len = srp->data.sglist_len;
SRpnt->sr_bufflen = srp->data.bufflen;
SRpnt->sr_underflow = 0;
SRpnt->sr_buffer = srp->data.buffer;
switch (hp->dxfer_direction) {
case SG_DXFER_TO_FROM_DEV:
case SG_DXFER_FROM_DEV:
SRpnt->sr_data_direction = SCSI_DATA_READ; break;
case SG_DXFER_TO_DEV:
SRpnt->sr_data_direction = SCSI_DATA_WRITE; break;
case SG_DXFER_UNKNOWN:
SRpnt->sr_data_direction = SCSI_DATA_UNKNOWN; break;
default:
SRpnt->sr_data_direction = SCSI_DATA_NONE; break;
}
srp->data.k_use_sg = 0;
srp->data.sglist_len = 0;
srp->data.bufflen = 0;
srp->data.buffer = NULL;
hp->duration = jiffies; /* unit jiffies now, millisecs after done */
/* Now send everything of to mid-level. The next time we hear about this
packet is when sg_cmd_done_bh() is called (i.e. a callback). */
scsi_do_req(SRpnt, (void *)cmnd,
(void *)SRpnt->sr_buffer, hp->dxfer_len,
sg_cmd_done_bh, timeout, SG_DEFAULT_RETRIES);
/* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,1)
generic_unplug_device(q);
#endif
return 0;
}
static int sg_ioctl(struct inode * inode, struct file * filp,
unsigned int cmd_in, unsigned long arg)
{
int result, val, read_only;
Sg_device * sdp;
Sg_fd * sfp;
Sg_request * srp;
unsigned long iflags;
if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp)))
return -ENXIO;
SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: dev=%d, cmd=0x%x\n",
MINOR(sdp->i_rdev), (int)cmd_in));
read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
switch(cmd_in)
{
case SG_IO:
{
int blocking = 1; /* ignore O_NONBLOCK flag */
if (sdp->detached)
return -ENODEV;
if(! scsi_block_when_processing_errors(sdp->device) )
return -ENXIO;
result = verify_area(VERIFY_WRITE, (void *)arg, SZ_SG_IO_HDR);
if (result) return result;
result = sg_new_write(sfp, (const char *)arg, SZ_SG_IO_HDR,
blocking, read_only, &srp);
if (result < 0) return result;
srp->sg_io_owned = 1;
while (1) {
result = 0; /* following macro to beat race condition */
__wait_event_interruptible(sfp->read_wait,
(sdp->detached || sfp->closed || srp->done), result);
if (sdp->detached)
return -ENODEV;
if (sfp->closed)
return 0; /* request packet dropped already */
if (0 == result)
break;
srp->orphan = 1;
return result; /* -ERESTARTSYS because signal hit process */
}
srp->done = 2;
result = sg_new_read(sfp, (char *)arg, SZ_SG_IO_HDR, srp);
return (result < 0) ? result : 0;
}
case SG_SET_TIMEOUT:
result = get_user(val, (int *)arg);
if (result) return result;
if (val < 0)
return -EIO;
sfp->timeout = val;
return 0;
case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
return sfp->timeout; /* strange ..., for backward compatibility */
case SG_SET_FORCE_LOW_DMA:
result = get_user(val, (int *)arg);
if (result) return result;
if (val) {
sfp->low_dma = 1;
if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
val = (int)sfp->reserve.bufflen;
sg_remove_scat(&sfp->reserve);
sg_build_reserve(sfp, val);
}
}
else {
if (sdp->detached)
return -ENODEV;
sfp->low_dma = sdp->device->host->unchecked_isa_dma;
}
return 0;
case SG_GET_LOW_DMA:
return put_user((int)sfp->low_dma, (int *)arg);
case SG_GET_SCSI_ID:
result = verify_area(VERIFY_WRITE, (void *)arg, sizeof(sg_scsi_id_t));
if (result) return result;
else {
sg_scsi_id_t * sg_idp = (sg_scsi_id_t *)arg;
if (sdp->detached)
return -ENODEV;
__put_user((int)sdp->device->host->host_no, &sg_idp->host_no);
__put_user((int)sdp->device->channel, &sg_idp->channel);
__put_user((int)sdp->device->id, &sg_idp->scsi_id);
__put_user((int)sdp->device->lun, &sg_idp->lun);
__put_user((int)sdp->device->type, &sg_idp->scsi_type);
__put_user((short)sdp->device->host->cmd_per_lun,
&sg_idp->h_cmd_per_lun);
__put_user((short)sdp->device->queue_depth,
&sg_idp->d_queue_depth);
__put_user(0, &sg_idp->unused[0]);
__put_user(0, &sg_idp->unused[1]);
return 0;
}
case SG_SET_FORCE_PACK_ID:
result = get_user(val, (int *)arg);
if (result) return result;
sfp->force_packid = val ? 1 : 0;
return 0;
case SG_GET_PACK_ID:
result = verify_area(VERIFY_WRITE, (void *) arg, sizeof(int));
if (result) return result;
read_lock_irqsave(&sfp->rq_list_lock, iflags);
for (srp = sfp->headrp; srp; srp = srp->nextrp) {
if ((1 == srp->done) && (! srp->sg_io_owned)) {
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
__put_user(srp->header.pack_id, (int *)arg);
return 0;
}
}
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
__put_user(-1, (int *)arg);
return 0;
case SG_GET_NUM_WAITING:
read_lock_irqsave(&sfp->rq_list_lock, iflags);
for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
if ((1 == srp->done) && (! srp->sg_io_owned))
++val;
}
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
return put_user(val, (int *)arg);
case SG_GET_SG_TABLESIZE:
return put_user(sdp->sg_tablesize, (int *)arg);
case SG_SET_RESERVED_SIZE:
result = get_user(val, (int *)arg);
if (result) return result;
if (val != sfp->reserve.bufflen) {
if (sg_res_in_use(sfp) || sfp->mmap_called)
return -EBUSY;
sg_remove_scat(&sfp->reserve);
sg_build_reserve(sfp, val);
}
return 0;
case SG_GET_RESERVED_SIZE:
val = (int)sfp->reserve.bufflen;
return put_user(val, (int *)arg);
case SG_SET_COMMAND_Q:
result = get_user(val, (int *)arg);
if (result) return result;
sfp->cmd_q = val ? 1 : 0;
return 0;
case SG_GET_COMMAND_Q:
return put_user((int)sfp->cmd_q, (int *)arg);
case SG_SET_KEEP_ORPHAN:
result = get_user(val, (int *)arg);
if (result) return result;
sfp->keep_orphan = val;
return 0;
case SG_GET_KEEP_ORPHAN:
return put_user((int)sfp->keep_orphan, (int *)arg);
case SG_NEXT_CMD_LEN:
result = get_user(val, (int *)arg);
if (result) return result;
sfp->next_cmd_len = (val > 0) ? val : 0;
return 0;
case SG_GET_VERSION_NUM:
return put_user(sg_version_num, (int *)arg);
case SG_GET_ACCESS_COUNT:
val = (sdp->device ? sdp->device->access_count : 0);
return put_user(val, (int *)arg);
case SG_GET_REQUEST_TABLE:
result = verify_area(VERIFY_WRITE, (void *) arg,
SZ_SG_REQ_INFO * SG_MAX_QUEUE);
if (result) return result;
else {
sg_req_info_t rinfo[SG_MAX_QUEUE];
Sg_request * srp;
read_lock_irqsave(&sfp->rq_list_lock, iflags);
for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
++val, srp = srp ? srp->nextrp : srp) {
memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
if (srp) {
rinfo[val].req_state = srp->done + 1;
rinfo[val].problem = srp->header.masked_status &
srp->header.host_status & srp->header.driver_status;
rinfo[val].duration = srp->done ?
srp->header.duration :
sg_jif_to_ms(jiffies - srp->header.duration);
rinfo[val].orphan = srp->orphan;
rinfo[val].sg_io_owned = srp->sg_io_owned;
rinfo[val].pack_id = srp->header.pack_id;
rinfo[val].usr_ptr = srp->header.usr_ptr;
}
}
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
__copy_to_user((void *)arg, rinfo, SZ_SG_REQ_INFO * SG_MAX_QUEUE);
return 0;
}
case SG_EMULATED_HOST:
if (sdp->detached)
return -ENODEV;
return put_user(sdp->device->host->hostt->emulated, (int *)arg);
case SG_SCSI_RESET:
if (sdp->detached)
return -ENODEV;
if (filp->f_flags & O_NONBLOCK) {
if (sdp->device->host->in_recovery)
return -EBUSY;
}
else if (! scsi_block_when_processing_errors(sdp->device))
return -EBUSY;
result = get_user(val, (int *)arg);
if (result) return result;
if (SG_SCSI_RESET_NOTHING == val)
return 0;
#ifdef SCSI_TRY_RESET_DEVICE
switch (val)
{
case SG_SCSI_RESET_DEVICE:
val = SCSI_TRY_RESET_DEVICE;
break;
case SG_SCSI_RESET_BUS:
val = SCSI_TRY_RESET_BUS;
break;
case SG_SCSI_RESET_HOST:
val = SCSI_TRY_RESET_HOST;
break;
default:
return -EINVAL;
}
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
return (scsi_reset_provider(sdp->device, val) == SUCCESS) ? 0 : -EIO;
#else
SCSI_LOG_TIMEOUT(1, printk("sg_ioctl: SG_RESET_SCSI not supported\n"));
result = -EINVAL;
#endif
case SCSI_IOCTL_SEND_COMMAND:
if (sdp->detached)
return -ENODEV;
if (read_only) {
unsigned char opcode = WRITE_6;
Scsi_Ioctl_Command * siocp = (void *)arg;
copy_from_user(&opcode, siocp->data, 1);
if (! sg_allow_access(opcode, sdp->device->type))
return -EACCES;
}
return scsi_ioctl_send_command(sdp->device, (void *)arg);
case SG_SET_DEBUG:
result = get_user(val, (int *)arg);
if (result) return result;
sdp->sgdebug = (char)val;
return 0;
case SCSI_IOCTL_GET_IDLUN:
case SCSI_IOCTL_GET_BUS_NUMBER:
case SCSI_IOCTL_PROBE_HOST:
case SG_GET_TRANSFORM:
if (sdp->detached)
return -ENODEV;
return scsi_ioctl(sdp->device, cmd_in, (void *)arg);
default:
if (read_only)
return -EACCES; /* don't know so take safe approach */
return scsi_ioctl(sdp->device, cmd_in, (void *)arg);
}
}
static unsigned int sg_poll(struct file * filp, poll_table * wait)
{
unsigned int res = 0;
Sg_device * sdp;
Sg_fd * sfp;
Sg_request * srp;
int count = 0;
unsigned long iflags;
if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp))
|| sfp->closed)
return POLLERR;
poll_wait(filp, &sfp->read_wait, wait);
read_lock_irqsave(&sfp->rq_list_lock, iflags);
for (srp = sfp->headrp; srp; srp = srp->nextrp) {
/* if any read waiting, flag it */
if ((0 == res) && (1 == srp->done) && (! srp->sg_io_owned))
res = POLLIN | POLLRDNORM;
++count;
}
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
if (sdp->detached)
res |= POLLHUP;
else if (! sfp->cmd_q) {
if (0 == count)
res |= POLLOUT | POLLWRNORM;
}
else if (count < SG_MAX_QUEUE)
res |= POLLOUT | POLLWRNORM;
SCSI_LOG_TIMEOUT(3, printk("sg_poll: dev=%d, res=0x%x\n",
MINOR(sdp->i_rdev), (int)res));
return res;
}
static int sg_fasync(int fd, struct file * filp, int mode)
{
int retval;
Sg_device * sdp;
Sg_fd * sfp;
if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp)))
return -ENXIO;
SCSI_LOG_TIMEOUT(3, printk("sg_fasync: dev=%d, mode=%d\n",
MINOR(sdp->i_rdev), mode));
retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
return (retval < 0) ? retval : 0;
}
static void sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish)
{
void * page_ptr;
struct page * page;
int k, m;
SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, "
"scatg=%d\n", startFinish, rsv_schp->k_use_sg));
/* N.B. correction _not_ applied to base page of aech allocation */
if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
struct scatterlist * sclp = rsv_schp->buffer;
for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) {
page_ptr = (unsigned char *)sclp->address + m;
page = virt_to_page(page_ptr);
if (startFinish)
get_page(page); /* increment page count */
else {
if (page_count(page) > 0)
put_page_testzero(page); /* decrement page count */
}
}
}
}
else { /* reserve buffer is just a single allocation */
for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) {
page_ptr = (unsigned char *)rsv_schp->buffer + m;
page = virt_to_page(page_ptr);
if (startFinish)
get_page(page); /* increment page count */
else {
if (page_count(page) > 0)
put_page_testzero(page); /* decrement page count */
}
}
}
}
static struct page * sg_vma_nopage(struct vm_area_struct *vma,
unsigned long addr, int unused)
{
Sg_fd * sfp;
struct page * page = NOPAGE_SIGBUS;
void * page_ptr = NULL;
unsigned long offset;
Sg_scatter_hold * rsv_schp;
if ((NULL == vma) || (! (sfp = (Sg_fd *)vma->vm_private_data)))
return page;
rsv_schp = &sfp->reserve;
offset = addr - vma->vm_start;
if (offset >= rsv_schp->bufflen)
return page;
SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
offset, rsv_schp->k_use_sg));
if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
int k;
unsigned long sa = vma->vm_start;
unsigned long len;
struct scatterlist * sclp = rsv_schp->buffer;
for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
++k, ++sclp) {
len = vma->vm_end - sa;
len = (len < sclp->length) ? len : sclp->length;
if (offset < len) {
page_ptr = (unsigned char *)sclp->address + offset;
page = virt_to_page(page_ptr);
get_page(page); /* increment page count */
break;
}
sa += len;
offset -= len;
}
}
else { /* reserve buffer is just a single allocation */
page_ptr = (unsigned char *)rsv_schp->buffer + offset;
page = virt_to_page(page_ptr);
get_page(page); /* increment page count */
}
return page;
}
static struct vm_operations_struct sg_mmap_vm_ops = {
nopage : sg_vma_nopage,
};
static int sg_mmap(struct file * filp, struct vm_area_struct *vma)
{
Sg_fd * sfp;
unsigned long req_sz = vma->vm_end - vma->vm_start;
Sg_scatter_hold * rsv_schp;
if ((! filp) || (! vma) || (! (sfp = (Sg_fd *)filp->private_data)))
return -ENXIO;
SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
(void *)vma->vm_start, (int)req_sz));
if (vma->vm_pgoff)
return -EINVAL; /* want no offset */
rsv_schp = &sfp->reserve;
if (req_sz > rsv_schp->bufflen)
return -ENOMEM; /* cannot map more than reserved buffer */
if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
int k;
unsigned long sa = vma->vm_start;
unsigned long len;
struct scatterlist * sclp = rsv_schp->buffer;
for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
++k, ++sclp) {
if ((unsigned long)sclp->address & (PAGE_SIZE - 1))
return -EFAULT; /* non page aligned memory ?? */
len = vma->vm_end - sa;
len = (len < sclp->length) ? len : sclp->length;
sa += len;
}
}
else { /* reserve buffer is just a single allocation */
if ((unsigned long)rsv_schp->buffer & (PAGE_SIZE - 1))
return -EFAULT; /* non page aligned memory ?? */
}
if (0 == sfp->mmap_called) {
sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
sfp->mmap_called = 1;
}
vma->vm_flags |= (VM_RESERVED | VM_IO);
vma->vm_private_data = sfp;
vma->vm_ops = &sg_mmap_vm_ops;
return 0;
}
/* This function is a "bottom half" handler that is called by the
* mid level when a command is completed (or has failed). */
static void sg_cmd_done_bh(Scsi_Cmnd * SCpnt)
{
Scsi_Request * SRpnt = SCpnt->sc_request;
int dev = MINOR(SRpnt->sr_request.rq_dev);
Sg_device * sdp = NULL;
Sg_fd * sfp;
Sg_request * srp = NULL;
read_lock(&sg_dev_arr_lock);
if (sg_dev_arr && (dev >= 0)) {
if (dev < sg_template.dev_max)
sdp = sg_dev_arr[dev];
}
if ((NULL == sdp) || sdp->detached) {
read_unlock(&sg_dev_arr_lock);
SCSI_LOG_TIMEOUT(1, printk("sg...bh: dev=%d gone\n", dev));
scsi_release_request(SRpnt);
SRpnt = NULL;
return;
}
sfp = sdp->headfp;
while (sfp) {
read_lock(&sfp->rq_list_lock);
for (srp = sfp->headrp; srp; srp = srp->nextrp) {
if (SRpnt == srp->my_cmdp)
break;
}
read_unlock(&sfp->rq_list_lock);
if (srp)
break;
sfp = sfp->nextfp;
}
if (! srp) {
read_unlock(&sg_dev_arr_lock);
SCSI_LOG_TIMEOUT(1, printk("sg...bh: req missing, dev=%d\n", dev));
scsi_release_request(SRpnt);
SRpnt = NULL;
return;
}
/* First transfer ownership of data buffers to sg_device object. */
srp->data.k_use_sg = SRpnt->sr_use_sg;
srp->data.sglist_len = SRpnt->sr_sglist_len;
srp->data.bufflen = SRpnt->sr_bufflen;
srp->data.buffer = SRpnt->sr_buffer;
/* now clear out request structure */
SRpnt->sr_use_sg = 0;
SRpnt->sr_sglist_len = 0;
SRpnt->sr_bufflen = 0;
SRpnt->sr_buffer = NULL;
SRpnt->sr_underflow = 0;
SRpnt->sr_request.rq_dev = MKDEV(0, 0); /* "sg" _disowns_ request blk */
srp->my_cmdp = NULL;
srp->done = 1;
read_unlock(&sg_dev_arr_lock);
SCSI_LOG_TIMEOUT(4, printk("sg...bh: dev=%d, pack_id=%d, res=0x%x\n",
dev, srp->header.pack_id, (int)SRpnt->sr_result));
srp->header.resid = SCpnt->resid;
/* sg_unmap_and(&srp->data, 0); */ /* unmap locked pages a.s.a.p. */
/* N.B. unit of duration changes here from jiffies to millisecs */
srp->header.duration = sg_jif_to_ms(jiffies - (int)srp->header.duration);
if (0 != SRpnt->sr_result) {
memcpy(srp->sense_b, SRpnt->sr_sense_buffer, sizeof(srp->sense_b));
srp->header.status = 0xff & SRpnt->sr_result;
srp->header.masked_status = status_byte(SRpnt->sr_result);
srp->header.msg_status = msg_byte(SRpnt->sr_result);
srp->header.host_status = host_byte(SRpnt->sr_result);
srp->header.driver_status = driver_byte(SRpnt->sr_result);
if ((sdp->sgdebug > 0) &&
((CHECK_CONDITION == srp->header.masked_status) ||
(COMMAND_TERMINATED == srp->header.masked_status)))
print_req_sense("sg_cmd_done_bh", SRpnt);
/* Following if statement is a patch supplied by Eric Youngdale */
if (driver_byte(SRpnt->sr_result) != 0
&& (SRpnt->sr_sense_buffer[0] & 0x7f) == 0x70
&& (SRpnt->sr_sense_buffer[2] & 0xf) == UNIT_ATTENTION
&& sdp->device->removable) {
/* Detected disc change. Set the bit - this may be used if */
/* there are filesystems using this device. */
sdp->device->changed = 1;
}
}
/* Rely on write phase to clean out srp status values, so no "else" */
scsi_release_request(SRpnt);
SRpnt = NULL;
if (sfp->closed) { /* whoops this fd already released, cleanup */
SCSI_LOG_TIMEOUT(1,
printk("sg...bh: already closed, freeing ...\n"));
sg_finish_rem_req(srp);
srp = NULL;
if (NULL == sfp->headrp) {
SCSI_LOG_TIMEOUT(1,
printk("sg...bh: already closed, final cleanup\n"));
if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
sdp->device->access_count--;
if (sdp->device->host->hostt->module)
__MOD_DEC_USE_COUNT(sdp->device->host->hostt->module);
}
if (sg_template.module)
__MOD_DEC_USE_COUNT(sg_template.module);
sfp = NULL;
}
}
else if (srp && srp->orphan) {
if (sfp->keep_orphan)
srp->sg_io_owned = 0;
else {
sg_finish_rem_req(srp);
srp = NULL;
}
}
if (sfp && srp) {
/* Now wake up any sg_read() that is waiting for this packet. */
wake_up_interruptible(&sfp->read_wait);
kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
}
}
static struct file_operations sg_fops = {
owner: THIS_MODULE,
read: sg_read,
write: sg_write,
poll: sg_poll,
ioctl: sg_ioctl,
open: sg_open,
mmap: sg_mmap,
release: sg_release,
fasync: sg_fasync,
};
static int sg_detect(Scsi_Device * scsidp)
{
sg_template.dev_noticed++;
return 1;
}
/* Driver initialization */
static int sg_init()
{
static int sg_registered = 0;
unsigned long iflags;
if ((sg_template.dev_noticed == 0) || sg_dev_arr)
return 0;
write_lock_irqsave(&sg_dev_arr_lock, iflags);
if(!sg_registered) {
if (devfs_register_chrdev(SCSI_GENERIC_MAJOR,"sg",&sg_fops))
{
printk(KERN_ERR "Unable to get major %d for generic SCSI device\n",
SCSI_GENERIC_MAJOR);
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
sg_template.dev_noticed = 0;
return 1;
}
sg_registered++;
}
SCSI_LOG_TIMEOUT(3, printk("sg_init\n"));
sg_template.dev_max = sg_template.dev_noticed + SG_DEV_ARR_LUMP;
sg_dev_arr = (Sg_device **)kmalloc(sg_template.dev_max *
sizeof(Sg_device *), GFP_ATOMIC);
if (NULL == sg_dev_arr) {
printk(KERN_ERR "sg_init: no space for sg_dev_arr\n");
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
sg_template.dev_noticed = 0;
return 1;
}
memset(sg_dev_arr, 0, sg_template.dev_max * sizeof(Sg_device *));
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
#ifdef CONFIG_PROC_FS
sg_proc_init();
#endif /* CONFIG_PROC_FS */
return 0;
}
#ifndef MODULE
static int __init sg_def_reserved_size_setup(char *str)
{
int tmp;
if (get_option(&str, &tmp) == 1) {
def_reserved_size = tmp;
if (tmp >= 0)
sg_big_buff = tmp;
return 1;
} else {
printk(KERN_WARNING "sg_def_reserved_size : usage "
"sg_def_reserved_size=n (n could be 65536, 131072 or 262144)\n");
return 0;
}
}
__setup("sg_def_reserved_size=", sg_def_reserved_size_setup);
#endif
static int sg_attach(Scsi_Device * scsidp)
{
Sg_device * sdp;
unsigned long iflags;
int k;
write_lock_irqsave(&sg_dev_arr_lock, iflags);
if (sg_template.nr_dev >= sg_template.dev_max) { /* try to resize */
Sg_device ** tmp_da;
int tmp_dev_max = sg_template.nr_dev + SG_DEV_ARR_LUMP;
tmp_da = (Sg_device **)kmalloc(tmp_dev_max *
sizeof(Sg_device *), GFP_ATOMIC);
if (NULL == tmp_da) {
scsidp->attached--;
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
printk(KERN_ERR "sg_attach: device array cannot be resized\n");
return 1;
}
memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *));
memcpy(tmp_da, sg_dev_arr, sg_template.dev_max * sizeof(Sg_device *));
kfree((char *)sg_dev_arr);
sg_dev_arr = tmp_da;
sg_template.dev_max = tmp_dev_max;
}
for(k = 0; k < sg_template.dev_max; k++)
if(! sg_dev_arr[k]) break;
if (k > MINORMASK) {
scsidp->attached--;
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
printk(KERN_WARNING "Unable to attach sg device <%d, %d, %d, %d>"
" type=%d, minor number exceed %d\n", scsidp->host->host_no,
scsidp->channel, scsidp->id, scsidp->lun, scsidp->type,
MINORMASK);
return 1;
}
if(k < sg_template.dev_max)
sdp = (Sg_device *)kmalloc(sizeof(Sg_device), GFP_ATOMIC);
else
sdp = NULL;
if (NULL == sdp) {
scsidp->attached--;
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
printk(KERN_ERR "sg_attach: Sg_device cannot be allocated\n");
return 1;
}
SCSI_LOG_TIMEOUT(3, printk("sg_attach: dev=%d \n", k));
sdp->device = scsidp;
init_waitqueue_head(&sdp->o_excl_wait);
sdp->headfp= NULL;
sdp->exclude = 0;
sdp->sgdebug = 0;
sdp->detached = 0;
sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0;
sdp->i_rdev = MKDEV(SCSI_GENERIC_MAJOR, k);
sdp->de = devfs_register (scsidp->de, "generic", DEVFS_FL_DEFAULT,
SCSI_GENERIC_MAJOR, k,
S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
&sg_fops, sdp);
sg_template.nr_dev++;
sg_dev_arr[k] = sdp;
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
switch (scsidp->type) {
case TYPE_DISK:
case TYPE_MOD:
case TYPE_ROM:
case TYPE_WORM:
case TYPE_TAPE: break;
default:
printk(KERN_NOTICE "Attached scsi generic sg%d at scsi%d, channel"
" %d, id %d, lun %d, type %d\n", k, scsidp->host->host_no,
scsidp->channel, scsidp->id, scsidp->lun, scsidp->type);
}
return 0;
}
/* Called at 'finish' of init process, after all attaches */
static void sg_finish(void)
{ }
static void sg_detach(Scsi_Device * scsidp)
{
Sg_device * sdp;
unsigned long iflags;
Sg_fd * sfp;
Sg_fd * tsfp;
Sg_request * srp;
Sg_request * tsrp;
int k, delay;
if (NULL == sg_dev_arr)
return;
delay = 0;
write_lock_irqsave(&sg_dev_arr_lock, iflags);
for (k = 0; k < sg_template.dev_max; k++) {
sdp = sg_dev_arr[k];
if ((NULL == sdp) || (sdp->device != scsidp))
continue; /* dirty but lowers nesting */
if (sdp->headfp) {
sdp->detached = 1;
for (sfp = sdp->headfp; sfp; sfp = tsfp) {
tsfp = sfp->nextfp;
for (srp = sfp->headrp; srp; srp = tsrp) {
tsrp = srp->nextrp;
if (sfp->closed || (0 == srp->done))
sg_finish_rem_req(srp);
}
if (sfp->closed) {
sdp->device->access_count--;
if (sg_template.module)
__MOD_DEC_USE_COUNT(sg_template.module);
if (sdp->device->host->hostt->module)
__MOD_DEC_USE_COUNT(sdp->device->host->hostt->module);
__sg_remove_sfp(sdp, sfp);
}
else {
delay = 1;
wake_up_interruptible(&sfp->read_wait);
kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
}
}
SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
devfs_unregister (sdp->de);
sdp->de = NULL;
if (NULL == sdp->headfp) {
kfree((char *)sdp);
sg_dev_arr[k] = NULL;
}
}
else { /* nothing active, simple case */
SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
devfs_unregister (sdp->de);
kfree((char *)sdp);
sg_dev_arr[k] = NULL;
}
scsidp->attached--;
sg_template.nr_dev--;
sg_template.dev_noticed--; /* from <dan@lectra.fr> */
break;
}
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
if (delay)
scsi_sleep(2); /* dirty detach so delay device destruction */
}
MODULE_AUTHOR("Douglas Gilbert");
MODULE_DESCRIPTION("SCSI generic (sg) driver");
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
MODULE_PARM(def_reserved_size, "i");
MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
static int __init init_sg(void) {
if (def_reserved_size >= 0)
sg_big_buff = def_reserved_size;
sg_template.module = THIS_MODULE;
return scsi_register_module(MODULE_SCSI_DEV, &sg_template);
}
static void __exit exit_sg( void)
{
#ifdef CONFIG_PROC_FS
sg_proc_cleanup();
#endif /* CONFIG_PROC_FS */
scsi_unregister_module(MODULE_SCSI_DEV, &sg_template);
devfs_unregister_chrdev(SCSI_GENERIC_MAJOR, "sg");
if(sg_dev_arr != NULL) {
kfree((char *)sg_dev_arr);
sg_dev_arr = NULL;
}
sg_template.dev_max = 0;
}
static int sg_start_req(Sg_request * srp)
{
int res;
Sg_fd * sfp = srp->parentfp;
sg_io_hdr_t * hp = &srp->header;
int dxfer_len = (int)hp->dxfer_len;
int dxfer_dir = hp->dxfer_direction;
Sg_scatter_hold * req_schp = &srp->data;
Sg_scatter_hold * rsv_schp = &sfp->reserve;
SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
return 0;
if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
(dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
(! sfp->parentdp->device->host->unchecked_isa_dma)) {
res = sg_build_dir(srp, sfp, dxfer_len);
if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
return res;
}
if ((! sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
sg_link_reserve(sfp, srp, dxfer_len);
else {
res = sg_build_indi(req_schp, sfp, dxfer_len);
if (res) {
sg_remove_scat(req_schp);
return res;
}
}
return 0;
}
static void sg_finish_rem_req(Sg_request * srp)
{
Sg_fd * sfp = srp->parentfp;
Sg_scatter_hold * req_schp = &srp->data;
SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n",
(int)srp->res_used));
sg_unmap_and(&srp->data, 1);
if (srp->res_used)
sg_unlink_reserve(sfp, srp);
else
sg_remove_scat(req_schp);
sg_remove_request(sfp, srp);
}
static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
int tablesize)
{
int mem_src, ret_sz;
int elem_sz = sizeof(struct scatterlist) + sizeof(char);
/* scatter gather array, followed by mem_src_arr (array of chars) */
int sg_bufflen = tablesize * elem_sz;
int mx_sc_elems = tablesize;
mem_src = SG_HEAP_KMAL;
schp->buffer = sg_malloc(sfp, sg_bufflen, &ret_sz, &mem_src);
if (! schp->buffer)
return -ENOMEM;
else if (ret_sz != sg_bufflen) {
sg_bufflen = ret_sz;
mx_sc_elems = sg_bufflen / elem_sz;
}
schp->buffer_mem_src = (char)mem_src;
schp->sglist_len = sg_bufflen;
memset(schp->buffer, 0, sg_bufflen);
return mx_sc_elems; /* number of scat_gath elements allocated */
}
static void sg_unmap_and(Sg_scatter_hold * schp, int free_also)
{
#ifdef SG_ALLOW_DIO_CODE
int nbhs = 0;
if (schp && schp->kiobp) {
if (schp->mapped) {
unmap_kiobuf(schp->kiobp);
schp->mapped = 0;
}
if (free_also) {
sg_free_kiovec(1, &schp->kiobp, &nbhs);
schp->kiobp = NULL;
}
}
#endif
}
static int sg_build_dir(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
{
#ifdef SG_ALLOW_DIO_CODE
int res, k, split, offset, num, mx_sc_elems, rem_sz;
struct kiobuf * kp;
char * mem_src_arr;
struct scatterlist * sclp;
unsigned long addr, prev_addr;
sg_io_hdr_t * hp = &srp->header;
Sg_scatter_hold * schp = &srp->data;
int sg_tablesize = sfp->parentdp->sg_tablesize;
int nbhs = 0;
res = sg_alloc_kiovec(1, &schp->kiobp, &nbhs);
if (0 != res) {
SCSI_LOG_TIMEOUT(5, printk("sg_build_dir: sg_alloc_kiovec res=%d\n",
res));
return 1;
}
res = map_user_kiobuf((SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0,
schp->kiobp, (unsigned long)hp->dxferp, dxfer_len);
if (0 != res) {
SCSI_LOG_TIMEOUT(5,
printk("sg_build_dir: map_user_kiobuf res=%d\n", res));
sg_unmap_and(schp, 1);
return 1;
}
schp->mapped = 1;
kp = schp->kiobp;
prev_addr = (unsigned long) page_address(kp->maplist[0]);
for (k = 1, split = 0; k < kp->nr_pages; ++k, prev_addr = addr) {
addr = (unsigned long) page_address(kp->maplist[k]);
if ((prev_addr + PAGE_SIZE) != addr) {
split = k;
break;
}
}
if (! split) {
schp->k_use_sg = 0;
schp->buffer = page_address(kp->maplist[0]) + kp->offset;
schp->bufflen = dxfer_len;
schp->buffer_mem_src = SG_USER_MEM;
schp->b_malloc_len = dxfer_len;
hp->info |= SG_INFO_DIRECT_IO;
return 0;
}
mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
if (mx_sc_elems <= 1) {
sg_unmap_and(schp, 1);
sg_remove_scat(schp);
return 1;
}
mem_src_arr = schp->buffer + (mx_sc_elems * sizeof(struct scatterlist));
for (k = 0, sclp = schp->buffer, rem_sz = dxfer_len;
(rem_sz > 0) && (k < mx_sc_elems);
++k, ++sclp) {
offset = (0 == k) ? kp->offset : 0;
num = (rem_sz > (PAGE_SIZE - offset)) ? (PAGE_SIZE - offset) :
rem_sz;
sclp->address = page_address(kp->maplist[k]) + offset;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,13)
sclp->page = NULL;
#endif
sclp->length = num;
mem_src_arr[k] = SG_USER_MEM;
rem_sz -= num;
SCSI_LOG_TIMEOUT(5,
printk("sg_build_dir: k=%d, a=0x%p, len=%d, ms=%d\n",
k, sclp->address, num, mem_src_arr[k]));
}
schp->k_use_sg = k;
SCSI_LOG_TIMEOUT(5,
printk("sg_build_dir: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
schp->bufflen = dxfer_len;
if (rem_sz > 0) { /* must have failed */
sg_unmap_and(schp, 1);
sg_remove_scat(schp);
return 1; /* out of scatter gather elements, try indirect */
}
hp->info |= SG_INFO_DIRECT_IO;
return 0;
#else
return 1;
#endif /* SG_ALLOW_DIO_CODE */
}
static int sg_build_indi(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
{
int ret_sz, mem_src;
int blk_size = buff_size;
char * p = NULL;
if ((blk_size < 0) || (! sfp))
return -EFAULT;
if (0 == blk_size)
++blk_size; /* don't know why */
/* round request up to next highest SG_SECTOR_SZ byte boundary */
blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
SCSI_LOG_TIMEOUT(4, printk("sg_build_indi: buff_size=%d, blk_size=%d\n",
buff_size, blk_size));
if (blk_size <= SG_SCATTER_SZ) {
mem_src = SG_HEAP_PAGE;
p = sg_malloc(sfp, blk_size, &ret_sz, &mem_src);
if (! p)
return -ENOMEM;
if (blk_size == ret_sz) { /* got it on the first attempt */
schp->k_use_sg = 0;
schp->buffer = p;
schp->bufflen = blk_size;
schp->buffer_mem_src = (char)mem_src;
schp->b_malloc_len = blk_size;
return 0;
}
}
else {
mem_src = SG_HEAP_PAGE;
p = sg_malloc(sfp, SG_SCATTER_SZ, &ret_sz, &mem_src);
if (! p)
return -ENOMEM;
}
/* Want some local declarations, so start new block ... */
{ /* lets try and build a scatter gather list */
struct scatterlist * sclp;
int k, rem_sz, num;
int mx_sc_elems;
int sg_tablesize = sfp->parentdp->sg_tablesize;
int first = 1;
char * mem_src_arr;
/* N.B. ret_sz and mem_src carried into this block ... */
mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
if (mx_sc_elems < 0)
return mx_sc_elems; /* most likely -ENOMEM */
mem_src_arr = schp->buffer +
(mx_sc_elems * sizeof(struct scatterlist));
for (k = 0, sclp = schp->buffer, rem_sz = blk_size;
(rem_sz > 0) && (k < mx_sc_elems);
++k, rem_sz -= ret_sz, ++sclp) {
if (first)
first = 0;
else {
num = (rem_sz > SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
mem_src = SG_HEAP_PAGE;
p = sg_malloc(sfp, num, &ret_sz, &mem_src);
if (! p)
break;
}
sclp->address = p;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,13)
sclp->page = NULL;
#endif
sclp->length = ret_sz;
mem_src_arr[k] = mem_src;
SCSI_LOG_TIMEOUT(5,
printk("sg_build_build: k=%d, a=0x%p, len=%d, ms=%d\n",
k, sclp->address, ret_sz, mem_src));
} /* end of for loop */
schp->k_use_sg = k;
SCSI_LOG_TIMEOUT(5,
printk("sg_build_indi: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
schp->bufflen = blk_size;
if (rem_sz > 0) /* must have failed */
return -ENOMEM;
}
return 0;
}
static int sg_write_xfer(Sg_request * srp)
{
sg_io_hdr_t * hp = &srp->header;
Sg_scatter_hold * schp = &srp->data;
int num_xfer = 0;
int j, k, onum, usglen, ksglen, res, ok;
int iovec_count = (int)hp->iovec_count;
int dxfer_dir = hp->dxfer_direction;
unsigned char * p;
unsigned char * up;
int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
(SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
num_xfer = (int)(new_interface ? hp->dxfer_len : hp->flags);
if (schp->bufflen < num_xfer)
num_xfer = schp->bufflen;
}
if ((num_xfer <= 0) ||
(new_interface && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
return 0;
SCSI_LOG_TIMEOUT(4,
printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
num_xfer, iovec_count, schp->k_use_sg));
if (iovec_count) {
onum = iovec_count;
if ((k = verify_area(VERIFY_READ, hp->dxferp,
SZ_SG_IOVEC * onum)))
return k;
}
else
onum = 1;
if (0 == schp->k_use_sg) { /* kernel has single buffer */
if (SG_USER_MEM != schp->buffer_mem_src) { /* else nothing to do */
for (j = 0, p = schp->buffer; j < onum; ++j) {
res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
if (res) return res;
usglen = (num_xfer > usglen) ? usglen : num_xfer;
__copy_from_user(p, up, usglen);
p += usglen;
num_xfer -= usglen;
if (num_xfer <= 0)
return 0;
}
}
}
else { /* kernel using scatter gather list */
struct scatterlist * sclp = (struct scatterlist *)schp->buffer;
char * mem_src_arr = sg_get_sgat_msa(schp);
ksglen = (int)sclp->length;
p = sclp->address;
for (j = 0, k = 0; j < onum; ++j) {
res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
if (res) return res;
for (; (k < schp->k_use_sg) && p;
++k, ++sclp, ksglen = (int)sclp->length, p = sclp->address) {
ok = (SG_USER_MEM != mem_src_arr[k]);
if (usglen <= 0)
break;
if (ksglen > usglen) {
if (usglen >= num_xfer) {
if (ok) __copy_from_user(p, up, num_xfer);
return 0;
}
if (ok) __copy_from_user(p, up, usglen);
p += usglen;
ksglen -= usglen;
break;
}
else {
if (ksglen >= num_xfer) {
if (ok) __copy_from_user(p, up, num_xfer);
return 0;
}
if (ok) __copy_from_user(p, up, ksglen);
up += ksglen;
usglen -= ksglen;
}
}
}
}
return 0;
}
static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
int wr_xf, int * countp, unsigned char ** up)
{
int num_xfer = (int)hp->dxfer_len;
unsigned char * p;
int count, k;
sg_iovec_t u_iovec;
if (0 == sg_num) {
p = (unsigned char *)hp->dxferp;
if (wr_xf && ('\0' == hp->interface_id))
count = (int)hp->flags; /* holds "old" input_size */
else
count = num_xfer;
}
else {
__copy_from_user(&u_iovec,
(unsigned char *)hp->dxferp + (ind * SZ_SG_IOVEC),
SZ_SG_IOVEC);
p = (unsigned char *)u_iovec.iov_base;
count = (int)u_iovec.iov_len;
}
if ((k = verify_area(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)))
return k;
if (up) *up = p;
if (countp) *countp = count;
return 0;
}
static char * sg_get_sgat_msa(Sg_scatter_hold * schp)
{
int elem_sz = sizeof(struct scatterlist) + sizeof(char);
int mx_sc_elems = schp->sglist_len / elem_sz;
return schp->buffer + (sizeof(struct scatterlist) * mx_sc_elems);
}
static void sg_remove_scat(Sg_scatter_hold * schp)
{
SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n",
schp->k_use_sg));
if (schp->buffer && schp->sglist_len) {
int k, mem_src;
struct scatterlist * sclp = (struct scatterlist *)schp->buffer;
char * mem_src_arr = sg_get_sgat_msa(schp);
for (k = 0; (k < schp->k_use_sg) && sclp->address; ++k, ++sclp) {
mem_src = mem_src_arr[k];
SCSI_LOG_TIMEOUT(5,
printk("sg_remove_scat: k=%d, a=0x%p, len=%d, ms=%d\n",
k, sclp->address, sclp->length, mem_src));
sg_free(sclp->address, sclp->length, mem_src);
sclp->address = NULL;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,13)
sclp->page = NULL;
#endif
sclp->length = 0;
}
sg_free(schp->buffer, schp->sglist_len, schp->buffer_mem_src);
}
else if (schp->buffer)
sg_free(schp->buffer, schp->b_malloc_len, schp->buffer_mem_src);
memset(schp, 0, sizeof(*schp));
}
static int sg_read_xfer(Sg_request * srp)
{
sg_io_hdr_t * hp = &srp->header;
Sg_scatter_hold * schp = &srp->data;
int num_xfer = 0;
int j, k, onum, usglen, ksglen, res, ok;
int iovec_count = (int)hp->iovec_count;
int dxfer_dir = hp->dxfer_direction;
unsigned char * p;
unsigned char * up;
int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) ||
(SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
num_xfer = hp->dxfer_len;
if (schp->bufflen < num_xfer)
num_xfer = schp->bufflen;
}
if ((num_xfer <= 0) ||
(new_interface && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
return 0;
SCSI_LOG_TIMEOUT(4,
printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
num_xfer, iovec_count, schp->k_use_sg));
if (iovec_count) {
onum = iovec_count;
if ((k = verify_area(VERIFY_READ, hp->dxferp,
SZ_SG_IOVEC * onum)))
return k;
}
else
onum = 1;
if (0 == schp->k_use_sg) { /* kernel has single buffer */
if (SG_USER_MEM != schp->buffer_mem_src) { /* else nothing to do */
for (j = 0, p = schp->buffer; j < onum; ++j) {
res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
if (res) return res;
usglen = (num_xfer > usglen) ? usglen : num_xfer;
__copy_to_user(up, p, usglen);
p += usglen;
num_xfer -= usglen;
if (num_xfer <= 0)
return 0;
}
}
}
else { /* kernel using scatter gather list */
struct scatterlist * sclp = (struct scatterlist *)schp->buffer;
char * mem_src_arr = sg_get_sgat_msa(schp);
ksglen = (int)sclp->length;
p = sclp->address;
for (j = 0, k = 0; j < onum; ++j) {
res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
if (res) return res;
for (; (k < schp->k_use_sg) && p;
++k, ++sclp, ksglen = (int)sclp->length, p = sclp->address) {
ok = (SG_USER_MEM != mem_src_arr[k]);
if (usglen <= 0)
break;
if (ksglen > usglen) {
if (usglen >= num_xfer) {
if (ok) __copy_to_user(up, p, num_xfer);
return 0;
}
if (ok) __copy_to_user(up, p, usglen);
p += usglen;
ksglen -= usglen;
break;
}
else {
if (ksglen >= num_xfer) {
if (ok) __copy_to_user(up, p, num_xfer);
return 0;
}
if (ok) __copy_to_user(up, p, ksglen);
up += ksglen;
usglen -= ksglen;
}
}
}
}
return 0;
}
static void sg_read_oxfer(Sg_request * srp, char * outp, int num_read_xfer)
{
Sg_scatter_hold * schp = &srp->data;
SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
num_read_xfer));
if ((! outp) || (num_read_xfer <= 0))
return;
if(schp->k_use_sg > 0) {
int k, num;
struct scatterlist * sclp = (struct scatterlist *)schp->buffer;
for (k = 0; (k < schp->k_use_sg) && sclp->address; ++k, ++sclp) {
num = (int)sclp->length;
if (num > num_read_xfer) {
__copy_to_user(outp, sclp->address, num_read_xfer);
break;
}
else {
__copy_to_user(outp, sclp->address, num);
num_read_xfer -= num;
if (num_read_xfer <= 0)
break;
outp += num;
}
}
}
else
__copy_to_user(outp, schp->buffer, num_read_xfer);
}
static void sg_build_reserve(Sg_fd * sfp, int req_size)
{
Sg_scatter_hold * schp = &sfp->reserve;
SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
do {
if (req_size < PAGE_SIZE)
req_size = PAGE_SIZE;
if (0 == sg_build_indi(schp, sfp, req_size))
return;
else
sg_remove_scat(schp);
req_size >>= 1; /* divide by 2 */
} while (req_size > (PAGE_SIZE / 2));
}
static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
{
Sg_scatter_hold * req_schp = &srp->data;
Sg_scatter_hold * rsv_schp = &sfp->reserve;
srp->res_used = 1;
SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
size = (size + 1) & (~1); /* round to even for aha1542 */
if (rsv_schp->k_use_sg > 0) {
int k, num;
int rem = size;
struct scatterlist * sclp = (struct scatterlist *)rsv_schp->buffer;
for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
num = (int)sclp->length;
if (rem <= num) {
if (0 == k) {
req_schp->k_use_sg = 0;
req_schp->buffer = sclp->address;
}
else {
sfp->save_scat_len = num;
sclp->length = (unsigned)rem;
req_schp->k_use_sg = k + 1;
req_schp->sglist_len = rsv_schp->sglist_len;
req_schp->buffer = rsv_schp->buffer;
}
req_schp->bufflen = size;
req_schp->buffer_mem_src = rsv_schp->buffer_mem_src;
req_schp->b_malloc_len = rsv_schp->b_malloc_len;
break;
}
else
rem -= num;
}
if (k >= rsv_schp->k_use_sg)
SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
}
else {
req_schp->k_use_sg = 0;
req_schp->bufflen = size;
req_schp->buffer = rsv_schp->buffer;
req_schp->buffer_mem_src = rsv_schp->buffer_mem_src;
req_schp->b_malloc_len = rsv_schp->b_malloc_len;
}
}
static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
{
Sg_scatter_hold * req_schp = &srp->data;
Sg_scatter_hold * rsv_schp = &sfp->reserve;
SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
(int)req_schp->k_use_sg));
if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
struct scatterlist * sclp = (struct scatterlist *)rsv_schp->buffer;
if (sfp->save_scat_len > 0)
(sclp + (req_schp->k_use_sg - 1))->length =
(unsigned)sfp->save_scat_len;
else
SCSI_LOG_TIMEOUT(1, printk(
"sg_unlink_reserve: BAD save_scat_len\n"));
}
req_schp->k_use_sg = 0;
req_schp->bufflen = 0;
req_schp->buffer = NULL;
req_schp->sglist_len = 0;
sfp->save_scat_len = 0;
srp->res_used = 0;
}
static Sg_request * sg_get_rq_mark(Sg_fd * sfp, int pack_id)
{
Sg_request * resp;
unsigned long iflags;
write_lock_irqsave(&sfp->rq_list_lock, iflags);
for (resp = sfp->headrp; resp; resp = resp->nextrp) {
/* look for requests that are ready + not SG_IO owned */
if ((1 == resp->done) && (! resp->sg_io_owned) &&
((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
resp->done = 2; /* guard against other readers */
break;
}
}
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
return resp;
}
#ifdef CONFIG_PROC_FS
static Sg_request * sg_get_nth_request(Sg_fd * sfp, int nth)
{
Sg_request * resp;
unsigned long iflags;
int k;
read_lock_irqsave(&sfp->rq_list_lock, iflags);
for (k = 0, resp = sfp->headrp; resp && (k < nth);
++k, resp = resp->nextrp)
;
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
return resp;
}
#endif
/* always adds to end of list */
static Sg_request * sg_add_request(Sg_fd * sfp)
{
int k;
unsigned long iflags;
Sg_request * resp;
Sg_request * rp = sfp->req_arr;
write_lock_irqsave(&sfp->rq_list_lock, iflags);
resp = sfp->headrp;
if (! resp) {
memset(rp, 0, sizeof(Sg_request));
rp->parentfp = sfp;
resp = rp;
sfp->headrp = resp;
}
else {
if (0 == sfp->cmd_q)
resp = NULL; /* command queuing disallowed */
else {
for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
if (! rp->parentfp)
break;
}
if (k < SG_MAX_QUEUE) {
memset(rp, 0, sizeof(Sg_request));
rp->parentfp = sfp;
while (resp->nextrp)
resp = resp->nextrp;
resp->nextrp = rp;
resp = rp;
}
else
resp = NULL;
}
}
if (resp) {
resp->nextrp = NULL;
resp->header.duration = jiffies;
resp->my_cmdp = NULL;
resp->data.kiobp = NULL;
}
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
return resp;
}
/* Return of 1 for found; 0 for not found */
static int sg_remove_request(Sg_fd * sfp, Sg_request * srp)
{
Sg_request * prev_rp;
Sg_request * rp;
unsigned long iflags;
int res = 0;
if ((! sfp) || (! srp) || (! sfp->headrp))
return res;
write_lock_irqsave(&sfp->rq_list_lock, iflags);
prev_rp = sfp->headrp;
if (srp == prev_rp) {
sfp->headrp = prev_rp->nextrp;
prev_rp->parentfp = NULL;
res = 1;
}
else {
while ((rp = prev_rp->nextrp)) {
if (srp == rp) {
prev_rp->nextrp = rp->nextrp;
rp->parentfp = NULL;
res = 1;
break;
}
prev_rp = rp;
}
}
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
return res;
}
#ifdef CONFIG_PROC_FS
static Sg_fd * sg_get_nth_sfp(Sg_device * sdp, int nth)
{
Sg_fd * resp;
unsigned long iflags;
int k;
read_lock_irqsave(&sg_dev_arr_lock, iflags);
for (k = 0, resp = sdp->headfp; resp && (k < nth);
++k, resp = resp->nextfp)
;
read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
return resp;
}
#endif
static Sg_fd * sg_add_sfp(Sg_device * sdp, int dev)
{
Sg_fd * sfp;
unsigned long iflags;
sfp = (Sg_fd *)sg_low_malloc(sizeof(Sg_fd), 0, SG_HEAP_KMAL, 0);
if (! sfp)
return NULL;
memset(sfp, 0, sizeof(Sg_fd));
sfp->fd_mem_src = SG_HEAP_KMAL;
init_waitqueue_head(&sfp->read_wait);
sfp->rq_list_lock = RW_LOCK_UNLOCKED;
sfp->timeout = SG_DEFAULT_TIMEOUT;
sfp->force_packid = SG_DEF_FORCE_PACK_ID;
sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
sdp->device->host->unchecked_isa_dma : 1;
sfp->cmd_q = SG_DEF_COMMAND_Q;
sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
sfp->parentdp = sdp;
write_lock_irqsave(&sg_dev_arr_lock, iflags);
if (! sdp->headfp)
sdp->headfp = sfp;
else { /* add to tail of existing list */
Sg_fd * pfp = sdp->headfp;
while (pfp->nextfp)
pfp = pfp->nextfp;
pfp->nextfp = sfp;
}
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p, m_s=%d\n",
sfp, (int)sfp->fd_mem_src));
sg_build_reserve(sfp, sg_big_buff);
SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
sfp->reserve.bufflen, sfp->reserve.k_use_sg));
return sfp;
}
static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
{
Sg_fd * fp;
Sg_fd * prev_fp;
prev_fp = sdp->headfp;
if (sfp == prev_fp)
sdp->headfp = prev_fp->nextfp;
else {
while ((fp = prev_fp->nextfp)) {
if (sfp == fp) {
prev_fp->nextfp = fp->nextfp;
break;
}
prev_fp = fp;
}
}
if (sfp->reserve.bufflen > 0) {
SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
(int)sfp->reserve.bufflen, (int)sfp->reserve.k_use_sg));
if (sfp->mmap_called)
sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */
sg_remove_scat(&sfp->reserve);
}
sfp->parentdp = NULL;
SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
sg_low_free((char *)sfp, sizeof(Sg_fd), sfp->fd_mem_src);
}
/* Returns 0 in normal case, 1 when detached and sdp object removed */
static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
{
Sg_request * srp;
Sg_request * tsrp;
int dirty = 0;
int res = 0;
for (srp = sfp->headrp; srp; srp = tsrp) {
tsrp = srp->nextrp;
if (srp->done)
sg_finish_rem_req(srp);
else
++dirty;
}
if (0 == dirty) {
unsigned long iflags;
write_lock_irqsave(&sg_dev_arr_lock, iflags);
__sg_remove_sfp(sdp, sfp);
if (sdp->detached && (NULL == sdp->headfp)) {
int k, maxd;
maxd = sg_template.dev_max;
for (k = 0; k < maxd; ++k) {
if (sdp == sg_dev_arr[k])
break;
}
if (k < maxd)
sg_dev_arr[k] = NULL;
kfree((char *)sdp);
res = 1;
}
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
}
else {
sfp->closed = 1; /* flag dirty state on this fd */
sdp->device->access_count++;
/* MOD_INC's to inhibit unloading sg and associated adapter driver */
if (sg_template.module)
__MOD_INC_USE_COUNT(sg_template.module);
if (sdp->device->host->hostt->module)
__MOD_INC_USE_COUNT(sdp->device->host->hostt->module);
SCSI_LOG_TIMEOUT(1, printk(
"sg_remove_sfp: worrisome, %d writes pending\n", dirty));
}
return res;
}
static int sg_res_in_use(Sg_fd * sfp)
{
const Sg_request * srp;
unsigned long iflags;
read_lock_irqsave(&sfp->rq_list_lock, iflags);
for (srp = sfp->headrp; srp; srp = srp->nextrp)
if (srp->res_used) break;
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
return srp ? 1 : 0;
}
/* If retSzp==NULL want exact size or fail */
static char * sg_low_malloc(int rqSz, int lowDma, int mem_src, int * retSzp)
{
char * resp = NULL;
int page_mask = lowDma ? (GFP_ATOMIC | GFP_DMA) : GFP_ATOMIC;
if (rqSz <= 0)
return resp;
if (SG_HEAP_KMAL == mem_src) {
resp = kmalloc(rqSz, page_mask);
if (resp && retSzp) *retSzp = rqSz;
return resp;
}
if (SG_HEAP_POOL == mem_src) {
int num_sect = rqSz / SG_SECTOR_SZ;
if (0 != (rqSz & SG_SECTOR_MSK)) {
if (! retSzp)
return resp;
++num_sect;
rqSz = num_sect * SG_SECTOR_SZ;
}
while (num_sect > 0) {
if ((num_sect <= sg_pool_secs_avail) &&
(scsi_dma_free_sectors > (SG_LOW_POOL_THRESHHOLD + num_sect))) {
resp = scsi_malloc(rqSz);
if (resp) {
if (retSzp) *retSzp = rqSz;
sg_pool_secs_avail -= num_sect;
return resp;
}
}
if (! retSzp)
return resp;
num_sect /= 2; /* try half as many */
rqSz = num_sect * SG_SECTOR_SZ;
}
}
else if (SG_HEAP_PAGE == mem_src) {
int order, a_size;
int resSz = rqSz;
for (order = 0, a_size = PAGE_SIZE;
a_size < rqSz; order++, a_size <<= 1)
;
resp = (char *)__get_free_pages(page_mask, order);
while ((! resp) && order && retSzp) {
--order;
a_size >>= 1; /* divide by 2, until PAGE_SIZE */
resp = (char *)__get_free_pages(page_mask, order); /* try half */
resSz = a_size;
}
if (retSzp) *retSzp = resSz;
}
else
printk(KERN_ERR "sg_low_malloc: bad mem_src=%d, rqSz=%df\n",
mem_src, rqSz);
return resp;
}
static char * sg_malloc(const Sg_fd * sfp, int size, int * retSzp,
int * mem_srcp)
{
char * resp = NULL;
if (retSzp) *retSzp = size;
if (size <= 0)
;
else {
int low_dma = sfp->low_dma;
int l_ms = -1; /* invalid value */
switch (*mem_srcp)
{
case SG_HEAP_PAGE:
l_ms = (size < PAGE_SIZE) ? SG_HEAP_POOL : SG_HEAP_PAGE;
resp = sg_low_malloc(size, low_dma, l_ms, 0);
if (resp)
break;
resp = sg_low_malloc(size, low_dma, l_ms, &size);
if (! resp) {
l_ms = (SG_HEAP_POOL == l_ms) ? SG_HEAP_PAGE : SG_HEAP_POOL;
resp = sg_low_malloc(size, low_dma, l_ms, &size);
if (! resp) {
l_ms = SG_HEAP_KMAL;
resp = sg_low_malloc(size, low_dma, l_ms, &size);
}
}
if (resp && retSzp) *retSzp = size;
break;
case SG_HEAP_KMAL:
l_ms = SG_HEAP_KMAL; /* was SG_HEAP_PAGE */
resp = sg_low_malloc(size, low_dma, l_ms, 0);
if (resp)
break;
l_ms = SG_HEAP_POOL;
resp = sg_low_malloc(size, low_dma, l_ms, &size);
if (resp && retSzp) *retSzp = size;
break;
default:
SCSI_LOG_TIMEOUT(1, printk("sg_malloc: bad ms=%d\n", *mem_srcp));
break;
}
if (resp) *mem_srcp = l_ms;
}
SCSI_LOG_TIMEOUT(6, printk("sg_malloc: size=%d, ms=%d, ret=0x%p\n",
size, *mem_srcp, resp));
return resp;
}
static inline int sg_alloc_kiovec(int nr, struct kiobuf **bufp, int *szp)
{
#if SG_NEW_KIOVEC
return alloc_kiovec_sz(nr, bufp, szp);
#else
return alloc_kiovec(nr, bufp);
#endif
}
static void sg_low_free(char * buff, int size, int mem_src)
{
if (! buff) return;
switch (mem_src) {
case SG_HEAP_POOL:
{
int num_sect = size / SG_SECTOR_SZ;
scsi_free(buff, size);
sg_pool_secs_avail += num_sect;
}
break;
case SG_HEAP_KMAL:
kfree(buff); /* size not used */
break;
case SG_HEAP_PAGE:
{
int order, a_size;
for (order = 0, a_size = PAGE_SIZE;
a_size < size; order++, a_size <<= 1)
;
free_pages((unsigned long)buff, order);
}
break;
case SG_USER_MEM:
break; /* nothing to do */
default:
printk(KERN_ERR "sg_low_free: bad mem_src=%d, buff=0x%p, rqSz=%d\n",
mem_src, buff, size);
break;
}
}
static void sg_free(char * buff, int size, int mem_src)
{
SCSI_LOG_TIMEOUT(6,
printk("sg_free: buff=0x%p, size=%d\n", buff, size));
if ((! buff) || (size <= 0))
;
else
sg_low_free(buff, size, mem_src);
}
static inline void sg_free_kiovec(int nr, struct kiobuf **bufp, int *szp)
{
#if SG_NEW_KIOVEC
free_kiovec_sz(nr, bufp, szp);
#else
free_kiovec(nr, bufp);
#endif
}
static int sg_ms_to_jif(unsigned int msecs)
{
if ((UINT_MAX / 2U) < msecs)
return INT_MAX; /* special case, set largest possible */
else
return ((int)msecs < (INT_MAX / 1000)) ? (((int)msecs * HZ) / 1000)
: (((int)msecs / 1000) * HZ);
}
static inline unsigned sg_jif_to_ms(int jifs)
{
if (jifs <= 0)
return 0U;
else {
unsigned int j = (unsigned int)jifs;
return (j < (UINT_MAX / 1000)) ? ((j * 1000) / HZ) : ((j / HZ) * 1000);
}
}
static unsigned char allow_ops[] = {TEST_UNIT_READY, INQUIRY,
READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
MODE_SENSE, MODE_SENSE_10};
static int sg_allow_access(unsigned char opcode, char dev_type)
{
int k;
if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
return 1;
for (k = 0; k < sizeof(allow_ops); ++k) {
if (opcode == allow_ops[k])
return 1;
}
return 0;
}
#ifdef CONFIG_PROC_FS
static int sg_last_dev()
{
int k;
unsigned long iflags;
read_lock_irqsave(&sg_dev_arr_lock, iflags);
for (k = sg_template.dev_max - 1; k >= 0; --k)
if (sg_dev_arr[k] && sg_dev_arr[k]->device) break;
read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
return k + 1; /* origin 1 */
}
#endif
static Sg_device * sg_get_dev(int dev)
{
Sg_device * sdp = NULL;
unsigned long iflags;
if (sg_dev_arr && (dev >= 0))
{
read_lock_irqsave(&sg_dev_arr_lock, iflags);
if (dev < sg_template.dev_max)
sdp = sg_dev_arr[dev];
read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
}
return sdp;
}
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry * sg_proc_sgp = NULL;
static char sg_proc_sg_dirname[] = "sg";
static const char * sg_proc_leaf_names[] = {"allow_dio", "def_reserved_size",
"debug", "devices", "device_hdr", "device_strs",
"hosts", "host_hdr", "host_strs", "version"};
static int sg_proc_adio_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data);
static int sg_proc_adio_info(char * buffer, int * len, off_t * begin,
off_t offset, int size);
static int sg_proc_adio_write(struct file * filp, const char * buffer,
unsigned long count, void * data);
static int sg_proc_dressz_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data);
static int sg_proc_dressz_info(char * buffer, int * len, off_t * begin,
off_t offset, int size);
static int sg_proc_dressz_write(struct file * filp, const char * buffer,
unsigned long count, void * data);
static int sg_proc_debug_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data);
static int sg_proc_debug_info(char * buffer, int * len, off_t * begin,
off_t offset, int size);
static int sg_proc_dev_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data);
static int sg_proc_dev_info(char * buffer, int * len, off_t * begin,
off_t offset, int size);
static int sg_proc_devhdr_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data);
static int sg_proc_devhdr_info(char * buffer, int * len, off_t * begin,
off_t offset, int size);
static int sg_proc_devstrs_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data);
static int sg_proc_devstrs_info(char * buffer, int * len, off_t * begin,
off_t offset, int size);
static int sg_proc_host_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data);
static int sg_proc_host_info(char * buffer, int * len, off_t * begin,
off_t offset, int size);
static int sg_proc_hosthdr_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data);
static int sg_proc_hosthdr_info(char * buffer, int * len, off_t * begin,
off_t offset, int size);
static int sg_proc_hoststrs_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data);
static int sg_proc_hoststrs_info(char * buffer, int * len, off_t * begin,
off_t offset, int size);
static int sg_proc_version_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data);
static int sg_proc_version_info(char * buffer, int * len, off_t * begin,
off_t offset, int size);
static read_proc_t * sg_proc_leaf_reads[] = {
sg_proc_adio_read, sg_proc_dressz_read, sg_proc_debug_read,
sg_proc_dev_read, sg_proc_devhdr_read, sg_proc_devstrs_read,
sg_proc_host_read, sg_proc_hosthdr_read, sg_proc_hoststrs_read,
sg_proc_version_read};
static write_proc_t * sg_proc_leaf_writes[] = {
sg_proc_adio_write, sg_proc_dressz_write, 0, 0, 0, 0, 0, 0, 0, 0};
#define PRINT_PROC(fmt,args...) \
do { \
*len += sprintf(buffer + *len, fmt, ##args); \
if (*begin + *len > offset + size) \
return 0; \
if (*begin + *len < offset) { \
*begin += *len; \
*len = 0; \
} \
} while(0)
#define SG_PROC_READ_FN(infofp) \
do { \
int len = 0; \
off_t begin = 0; \
*eof = infofp(buffer, &len, &begin, offset, size); \
if (offset >= (begin + len)) \
return 0; \
*start = buffer + offset - begin; \
return (size < (begin + len - offset)) ? \
size : begin + len - offset; \
} while(0)
static int sg_proc_init()
{
int k, mask;
int leaves = sizeof(sg_proc_leaf_names) / sizeof(sg_proc_leaf_names[0]);
struct proc_dir_entry * pdep;
if (! proc_scsi)
return 1;
sg_proc_sgp = create_proc_entry(sg_proc_sg_dirname,
S_IFDIR | S_IRUGO | S_IXUGO, proc_scsi);
if (! sg_proc_sgp)
return 1;
for (k = 0; k < leaves; ++k) {
mask = sg_proc_leaf_writes[k] ? S_IRUGO | S_IWUSR : S_IRUGO;
pdep = create_proc_entry(sg_proc_leaf_names[k], mask, sg_proc_sgp);
if (pdep) {
pdep->read_proc = sg_proc_leaf_reads[k];
if (sg_proc_leaf_writes[k])
pdep->write_proc = sg_proc_leaf_writes[k];
}
}
return 0;
}
static void sg_proc_cleanup()
{
int k;
int leaves = sizeof(sg_proc_leaf_names) / sizeof(sg_proc_leaf_names[0]);
if ((! proc_scsi) || (! sg_proc_sgp))
return;
for (k = 0; k < leaves; ++k)
remove_proc_entry(sg_proc_leaf_names[k], sg_proc_sgp);
remove_proc_entry(sg_proc_sg_dirname, proc_scsi);
}
static int sg_proc_adio_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data)
{ SG_PROC_READ_FN(sg_proc_adio_info); }
static int sg_proc_adio_info(char * buffer, int * len, off_t * begin,
off_t offset, int size)
{
PRINT_PROC("%d\n", sg_allow_dio);
return 1;
}
static int sg_proc_adio_write(struct file * filp, const char * buffer,
unsigned long count, void * data)
{
int num;
char buff[11];
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
num = (count < 10) ? count : 10;
copy_from_user(buff, buffer, num);
buff[num] = '\0';
sg_allow_dio = simple_strtoul(buff, 0, 10) ? 1 : 0;
return count;
}
static int sg_proc_dressz_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data)
{ SG_PROC_READ_FN(sg_proc_dressz_info); }
static int sg_proc_dressz_info(char * buffer, int * len, off_t * begin,
off_t offset, int size)
{
PRINT_PROC("%d\n", sg_big_buff);
return 1;
}
static int sg_proc_dressz_write(struct file * filp, const char * buffer,
unsigned long count, void * data)
{
int num;
unsigned long k = ULONG_MAX;
char buff[11];
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
num = (count < 10) ? count : 10;
copy_from_user(buff, buffer, num);
buff[num] = '\0';
k = simple_strtoul(buff, 0, 10);
if (k <= 1048576) {
sg_big_buff = k;
return count;
}
return -ERANGE;
}
static int sg_proc_debug_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data)
{ SG_PROC_READ_FN(sg_proc_debug_info); }
static int sg_proc_debug_info(char * buffer, int * len, off_t * begin,
off_t offset, int size)
{
Sg_device * sdp;
const sg_io_hdr_t * hp;
int j, max_dev, new_interface;
if (NULL == sg_dev_arr) {
PRINT_PROC("sg_dev_arr NULL, driver not initialized\n");
return 1;
}
max_dev = sg_last_dev();
PRINT_PROC("dev_max(currently)=%d max_active_device=%d (origin 1)\n",
sg_template.dev_max, max_dev);
PRINT_PROC(" scsi_dma_free_sectors=%u sg_pool_secs_aval=%d "
"def_reserved_size=%d\n",
scsi_dma_free_sectors, sg_pool_secs_avail, sg_big_buff);
for (j = 0; j < max_dev; ++j) {
if ((sdp = sg_get_dev(j))) {
Sg_fd * fp;
Sg_request * srp;
struct scsi_device * scsidp;
int dev, k, m, blen, usg;
scsidp = sdp->device;
if (NULL == scsidp) {
PRINT_PROC("device %d detached ??\n", j);
continue;
}
dev = MINOR(sdp->i_rdev);
if (sg_get_nth_sfp(sdp, 0)) {
PRINT_PROC(" >>> device=sg%d ", dev);
if (sdp->detached)
PRINT_PROC("detached pending close ");
else
PRINT_PROC("scsi%d chan=%d id=%d lun=%d em=%d",
scsidp->host->host_no, scsidp->channel,
scsidp->id, scsidp->lun, scsidp->host->hostt->emulated);
PRINT_PROC(" sg_tablesize=%d excl=%d\n", sdp->sg_tablesize,
sdp->exclude);
}
for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
PRINT_PROC(" FD(%d): timeout=%dms bufflen=%d "
"(res)sgat=%d low_dma=%d\n", k + 1,
sg_jif_to_ms(fp->timeout), fp->reserve.bufflen,
(int)fp->reserve.k_use_sg, (int)fp->low_dma);
PRINT_PROC(" cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
(int)fp->cmd_q, (int)fp->force_packid,
(int)fp->keep_orphan, (int)fp->closed);
for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
hp = &srp->header;
new_interface = (hp->interface_id == '\0') ? 0 : 1;
/* stop indenting so far ... */
PRINT_PROC(srp->res_used ? ((new_interface &&
(SG_FLAG_MMAP_IO & hp->flags)) ? " mmap>> " : " rb>> ") :
((SG_INFO_DIRECT_IO_MASK & hp->info) ? " dio>> " : " "));
blen = srp->my_cmdp ? srp->my_cmdp->sr_bufflen : srp->data.bufflen;
usg = srp->my_cmdp ? srp->my_cmdp->sr_use_sg : srp->data.k_use_sg;
PRINT_PROC(srp->done ? ((1 == srp->done) ? "rcv:" : "fin:")
: (srp->my_cmdp ? "act:" : "prior:"));
PRINT_PROC(" id=%d blen=%d", srp->header.pack_id, blen);
if (srp->done)
PRINT_PROC(" dur=%d", hp->duration);
else
PRINT_PROC(" t_o/elap=%d/%d", new_interface ? hp->timeout :
sg_jif_to_ms(fp->timeout),
sg_jif_to_ms(hp->duration ? (jiffies - hp->duration) : 0));
PRINT_PROC("ms sgat=%d op=0x%02x\n", usg, (int)srp->data.cmd_opcode);
/* reset indenting */
}
if (0 == m)
PRINT_PROC(" No requests active\n");
}
}
}
return 1;
}
static int sg_proc_dev_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data)
{ SG_PROC_READ_FN(sg_proc_dev_info); }
static int sg_proc_dev_info(char * buffer, int * len, off_t * begin,
off_t offset, int size)
{
Sg_device * sdp;
int j, max_dev;
struct scsi_device * scsidp;
max_dev = sg_last_dev();
for (j = 0; j < max_dev; ++j) {
sdp = sg_get_dev(j);
if (sdp && (scsidp = sdp->device) && (! sdp->detached))
PRINT_PROC("%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
scsidp->host->host_no, scsidp->channel, scsidp->id,
scsidp->lun, (int)scsidp->type, (int)scsidp->access_count,
(int)scsidp->queue_depth, (int)scsidp->device_busy,
(int)scsidp->online);
else
PRINT_PROC("-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
}
return 1;
}
static int sg_proc_devhdr_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data)
{ SG_PROC_READ_FN(sg_proc_devhdr_info); }
static int sg_proc_devhdr_info(char * buffer, int * len, off_t * begin,
off_t offset, int size)
{
PRINT_PROC("host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
return 1;
}
static int sg_proc_devstrs_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data)
{ SG_PROC_READ_FN(sg_proc_devstrs_info); }
static int sg_proc_devstrs_info(char * buffer, int * len, off_t * begin,
off_t offset, int size)
{
Sg_device * sdp;
int j, max_dev;
struct scsi_device * scsidp;
max_dev = sg_last_dev();
for (j = 0; j < max_dev; ++j) {
sdp = sg_get_dev(j);
if (sdp && (scsidp = sdp->device) && (! sdp->detached))
PRINT_PROC("%8.8s\t%16.16s\t%4.4s\n",
scsidp->vendor, scsidp->model, scsidp->rev);
else
PRINT_PROC("<no active device>\n");
}
return 1;
}
static int sg_proc_host_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data)
{ SG_PROC_READ_FN(sg_proc_host_info); }
static int sg_proc_host_info(char * buffer, int * len, off_t * begin,
off_t offset, int size)
{
struct Scsi_Host * shp;
int k;
for (k = 0, shp = scsi_hostlist; shp; shp = shp->next, ++k) {
for ( ; k < shp->host_no; ++k)
PRINT_PROC("-1\t-1\t-1\t-1\t-1\t-1\n");
PRINT_PROC("%u\t%hu\t%hd\t%hu\t%d\t%d\n",
shp->unique_id, shp->host_busy, shp->cmd_per_lun,
shp->sg_tablesize, (int)shp->unchecked_isa_dma,
(int)shp->hostt->emulated);
}
return 1;
}
static int sg_proc_hosthdr_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data)
{ SG_PROC_READ_FN(sg_proc_hosthdr_info); }
static int sg_proc_hosthdr_info(char * buffer, int * len, off_t * begin,
off_t offset, int size)
{
PRINT_PROC("uid\tbusy\tcpl\tscatg\tisa\temul\n");
return 1;
}
static int sg_proc_hoststrs_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data)
{ SG_PROC_READ_FN(sg_proc_hoststrs_info); }
static int sg_proc_hoststrs_info(char * buffer, int * len, off_t * begin,
off_t offset, int size)
{
struct Scsi_Host * shp;
int k;
for (k = 0, shp = scsi_hostlist; shp; shp = shp->next, ++k) {
for ( ; k < shp->host_no; ++k)
PRINT_PROC("<no active host>\n");
PRINT_PROC("%s\n", shp->hostt->info ? shp->hostt->info(shp) :
(shp->hostt->name ? shp->hostt->name : "<no name>"));
}
return 1;
}
static int sg_proc_version_read(char * buffer, char ** start, off_t offset,
int size, int * eof, void * data)
{ SG_PROC_READ_FN(sg_proc_version_info); }
static int sg_proc_version_info(char * buffer, int * len, off_t * begin,
off_t offset, int size)
{
PRINT_PROC("%d\t%s\n", sg_version_num, sg_version_str);
return 1;
}
#endif /* CONFIG_PROC_FS */
module_init(init_sg);
module_exit(exit_sg);
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