sg.c
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上传日期:2013-04-10
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文件大小:97k
- /*
- * 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 - 2002 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: 3.1.24 (20020505)";
- #endif
- static int sg_version_num = 30124; /* 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%xn", 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 = -EPERM; /* 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=%dn", 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=%dn",
- 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 != ' ')
- 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=%dn",
- 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 fulln"));
- 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 longn"));
- 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=%dn",
- (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 = ' '; /* 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) ?
- 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 fulln"));
- 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 -EPERM;
- }
- 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=%dn",
- (int)cmnd[0], (int)hp->cmd_len));
- if ((k = sg_start_req(srp))) {
- SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%dn", 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 addressn"));
- 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 memn"));
- 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%xn",
- 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 supportedn"));
- 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 -EPERM;
- }
- 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 -EPERM; /* 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%xn",
- 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=%dn",
- 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=%dn", 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=%dn",
- 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=%dn",
- (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 gonen", 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=%dn", 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%xn",
- 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 cleanupn"));
- 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 devicen",
- 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_initn"));
- 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_arrn");
- 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 resizedn");
- 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 %dn", 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 allocatedn");
- 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 %dn", 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, dirtyn", 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=%dn", 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=%dn", 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=%dn",
- (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=%dn",
- 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=%dn", 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=%dn",
- 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=%dn", 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=%dn",
- 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=%dn",
- 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=%dn", 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 = (' ' == 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=%dn",
- 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; ++k, ++sclp) {
- ksglen = (int)sclp->length;
- p = sclp->address;
- if (NULL == p)
- break;
- 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 && (' ' == 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=%dn",
- 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=%dn",
- 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 = (' ' == 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=%dn",
- 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; ++k, ++sclp) {
- ksglen = (int)sclp->length;
- p = sclp->address;
- if (NULL == p)
- break;
- 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=%dn",
- 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=%dn", 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=%dn", 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 sizen"));
- }
- 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=%dn",
- (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_lenn"));
- }
- 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=%dn",
- 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=%dn",
- 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=%dn",
- (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%pn", 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 pendingn", 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) {
- if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
- memset(resp, 0, rqSz);
- if (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 (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
- memset(resp, 0, rqSz);
- 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 (resp) {
- if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
- memset(resp, 0, resSz);
- if (retSzp) *retSzp = resSz;
- }
- }
- else
- printk(KERN_ERR "sg_low_malloc: bad mem_src=%d, rqSz=%dfn",
- 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=%dn", *mem_srcp));
- break;
- }
- if (resp) *mem_srcp = l_ms;
- }
- SCSI_LOG_TIMEOUT(6, printk("sg_malloc: size=%d, ms=%d, ret=0x%pn",
- 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=%dn",
- 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=%dn", 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, REQUEST_SENSE,
- INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
- MODE_SENSE, MODE_SENSE_10, LOG_SENSE};
- 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("%dn", 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] = ' ';
- 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("%dn", 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] = ' ';
- 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 initializedn");
- 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=%dn",
- 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=%dn", 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=%dn", 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=%dn",
- (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 : 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%02xn", usg, (int)srp->data.cmd_opcode);
- /* reset indenting */
- }
- if (0 == m)
- PRINT_PROC(" No requests activen");
- }
- }
- }
- 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("%dt%dt%dt%dt%dt%dt%dt%dt%dn",
- 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("-1t-1t-1t-1t-1t-1t-1t-1t-1n");
- }
- 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("hosttchantidtlunttypetopenstqdepthtbusytonlinen");
- 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("%8.8st%16.16st%4.4sn",
- 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("-1t-1t-1t-1t-1t-1n");
- PRINT_PROC("%ut%hut%hdt%hut%dt%dn",
- 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("uidtbusytcpltscatgtisatemuln");
- 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); }
- #define SG_MAX_HOST_STR_LEN 256
- static int sg_proc_hoststrs_info(char * buffer, int * len, off_t * begin,
- off_t offset, int size)
- {
- struct Scsi_Host * shp;
- int k;
- char buff[SG_MAX_HOST_STR_LEN];
- char * cp;
- for (k = 0, shp = scsi_hostlist; shp; shp = shp->next, ++k) {
- for ( ; k < shp->host_no; ++k)
- PRINT_PROC("<no active host>n");
- strncpy(buff, shp->hostt->info ? shp->hostt->info(shp) :
- (shp->hostt->name ? shp->hostt->name : "<no name>"),
- SG_MAX_HOST_STR_LEN);
- buff[SG_MAX_HOST_STR_LEN - 1] = ' ';
- for (cp = buff; *cp; ++cp) {
- if ('n' == *cp)
- *cp = ' '; /* suppress imbedded newlines */
- }
- PRINT_PROC("%sn", buff);
- }
- 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("%dt%sn", sg_version_num, sg_version_str);
- return 1;
- }
- #endif /* CONFIG_PROC_FS */
- module_init(init_sg);
- module_exit(exit_sg);