diff options
Diffstat (limited to 'drivers/scsi/sg.c')
| -rw-r--r-- | drivers/scsi/sg.c | 3092 |
1 files changed, 3092 insertions, 0 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c new file mode 100644 index 000000000000..fd72d73bb244 --- /dev/null +++ b/drivers/scsi/sg.c @@ -0,0 +1,3092 @@ +/* + * 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 - 2005 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. + * + */ + +static int sg_version_num = 30532; /* 2 digits for each component */ +#define SG_VERSION_STR "3.5.32" + +/* + * 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). + * + */ +#include <linux/config.h> +#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 <linux/moduleparam.h> +#include <linux/devfs_fs_kernel.h> +#include <linux/cdev.h> +#include <linux/seq_file.h> +#include <linux/blkdev.h> +#include <linux/delay.h> + +#include "scsi.h" +#include <scsi/scsi_host.h> +#include <scsi/scsi_driver.h> +#include <scsi/scsi_ioctl.h> +#include <scsi/sg.h> + +#include "scsi_logging.h" + +#ifdef CONFIG_SCSI_PROC_FS +#include <linux/proc_fs.h> +static char *sg_version_date = "20050117"; + +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 by commenting this define */ + +#define SG_MAX_DEVS 32768 + +/* + * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) + * Then when using 32 bit integers x * m may overflow during the calculation. + * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m + * calculates the same, but prevents the overflow when both m and d + * are "small" numbers (like HZ and USER_HZ). + * Of course an overflow is inavoidable if the result of muldiv doesn't fit + * in 32 bits. + */ +#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) + +#define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) + +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_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */ + +static int sg_add(struct class_device *); +static void sg_remove(struct class_device *); + +static Scsi_Request *dummy_cmdp; /* only used for sizeof */ + +static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock + file descriptor list for device */ + +static struct class_interface sg_interface = { + .add = sg_add, + .remove = sg_remove, +}; + +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 (k_use_sg>0) */ + char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ + unsigned char cmd_opcode; /* first byte of command */ +} Sg_scatter_hold; + +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; + +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 */ + int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ + 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 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; + +typedef struct sg_device { /* holds the state of each scsi generic device */ + struct 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 */ + 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 */ + struct gendisk *disk; + struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ +} Sg_device; + +static int sg_fasync(int fd, struct file *filp, int mode); +static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */ +static int sg_start_req(Sg_request * srp); +static void sg_finish_rem_req(Sg_request * srp); +static int sg_build_indirect(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 __user *buf, size_t count, + Sg_request * srp); +static ssize_t sg_new_write(Sg_fd * sfp, const char __user *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 __user **up); +static int sg_write_xfer(Sg_request * srp); +static int sg_read_xfer(Sg_request * srp); +static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); +static void sg_remove_scat(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_page_malloc(int rqSz, int lowDma, int *retSzp); +static void sg_page_free(char *buff, int size); +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_allow_access(unsigned char opcode, char dev_type); +static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); +static Sg_device *sg_get_dev(int dev); +static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp); +#ifdef CONFIG_SCSI_PROC_FS +static int sg_last_dev(void); +#endif + +static Sg_device **sg_dev_arr = NULL; +static int sg_dev_max; +static int sg_nr_dev; + +#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 = iminor(inode); + int flags = filp->f_flags; + Sg_device *sdp; + Sg_fd *sfp; + int res; + int retval; + + nonseekable_open(inode, filp); + 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 */ + retval = scsi_device_get(sdp->device); + if (retval) + return retval; + + 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)) { + retval = -EBUSY; + 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) { + retval = -EBUSY; + 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: + scsi_device_put(sdp->device); + 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; + + if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) + return -ENXIO; + SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); + 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) { + scsi_device_put(sdp->device); + } + sdp->exclude = 0; + wake_up_interruptible(&sdp->o_excl_wait); + } + return 0; +} + +static ssize_t +sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) +{ + int 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: %s, count=%d\n", + sdp->disk->disk_name, (int) count)); + if (!access_ok(VERIFY_WRITE, buf, count)) + return -EFAULT; + if (sfp->force_packid && (count >= SZ_SG_HEADER)) { + if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) + return -EFAULT; + if (old_hdr.reply_len < 0) { + if (count >= SZ_SG_IO_HDR) { + if (__copy_from_user + (&new_hdr, buf, SZ_SG_IO_HDR)) + return -EFAULT; + 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) { + if (__copy_to_user(buf, &old_hdr, SZ_SG_HEADER)) + return -EFAULT; + buf += SZ_SG_HEADER; + if (count > old_hdr.reply_len) + count = old_hdr.reply_len; + if (count > SZ_SG_HEADER) { + if ((res = + sg_read_oxfer(srp, buf, count - SZ_SG_HEADER))) + return -EFAULT; + } + } 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 __user *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 (copy_to_user(hp->sbp, srp->sense_b, len)) { + err = -EFAULT; + goto err_out; + } + hp->sb_len_wr = len; + } + } + if (hp->masked_status || hp->host_status || hp->driver_status) + hp->info |= SG_INFO_CHECK; + if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { + err = -EFAULT; + goto err_out; + } + 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 __user *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: %s, count=%d\n", + sdp->disk->disk_name, (int) count)); + if (sdp->detached) + return -ENODEV; + if (!((filp->f_flags & O_NONBLOCK) || + scsi_block_when_processing_errors(sdp->device))) + return -ENXIO; + + if (!access_ok(VERIFY_READ, buf, count)) + return -EFAULT; /* protects following copy_from_user()s + get_user()s */ + if (count < SZ_SG_HEADER) + return -EIO; + if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) + return -EFAULT; + 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) ? + 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 = (char __user *)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; + if (__copy_from_user(cmnd, buf, cmd_size)) + return -EFAULT; + /* + * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, + * but is is possible that the app intended SG_DXFER_TO_DEV, because there + * is a non-zero input_size, so emit a warning. + */ + if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) + if (printk_ratelimit()) + printk(KERN_WARNING + "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" + "guessing data in;\n" KERN_WARNING " " + "program %s not setting count and/or reply_len properly\n", + old_hdr.reply_len - (int)SZ_SG_HEADER, + input_size, (unsigned int) cmnd[0], + current->comm); + 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 __user *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; + unsigned long ul_timeout; + + if (count < SZ_SG_IO_HDR) + return -EINVAL; + if (!access_ok(VERIFY_READ, buf, count)) + return -EFAULT; /* 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; + if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { + sg_remove_request(sfp, srp); + return -EFAULT; + } + 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 */ + } + } + ul_timeout = msecs_to_jiffies(srp->header.timeout); + timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; + if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { + sg_remove_request(sfp, srp); + return -EMSGSIZE; + } + if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { + sg_remove_request(sfp, srp); + return -EFAULT; /* protects following copy_from_user()s + get_user()s */ + } + if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { + sg_remove_request(sfp, srp); + return -EFAULT; + } + 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=%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, GFP_ATOMIC); + 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_disk = sdp->disk; + SRpnt->sr_sense_buffer[0] = 0; + SRpnt->sr_cmd_len = hp->cmd_len; + 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; + } + SRpnt->upper_private_data = srp; + 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() is called (i.e. a callback). */ + scsi_do_req(SRpnt, (void *) cmnd, + (void *) SRpnt->sr_buffer, hp->dxfer_len, + sg_cmd_done, timeout, SG_DEFAULT_RETRIES); + /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */ + return 0; +} + +static int +sg_srp_done(Sg_request *srp, Sg_fd *sfp) +{ + unsigned long iflags; + int done; + + read_lock_irqsave(&sfp->rq_list_lock, iflags); + done = srp->done; + read_unlock_irqrestore(&sfp->rq_list_lock, iflags); + return done; +} + +static int +sg_ioctl(struct inode *inode, struct file *filp, + unsigned int cmd_in, unsigned long arg) +{ + void __user *p = (void __user *)arg; + int __user *ip = p; + 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: %s, cmd=0x%x\n", + sdp->disk->disk_name, (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; + if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) + return -EFAULT; + result = + sg_new_write(sfp, p, 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 || sg_srp_done(srp, sfp)), + 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 */ + } + write_lock_irqsave(&sfp->rq_list_lock, iflags); + srp->done = 2; + write_unlock_irqrestore(&sfp->rq_list_lock, iflags); + result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); + return (result < 0) ? result : 0; + } + case SG_SET_TIMEOUT: + result = get_user(val, ip); + if (result) + return result; + if (val < 0) + return -EIO; + if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) + val = MULDIV (INT_MAX, USER_HZ, HZ); + sfp->timeout_user = val; + sfp->timeout = MULDIV (val, HZ, USER_HZ); + + return 0; + case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ + /* strange ..., for backward compatibility */ + return sfp->timeout_user; + case SG_SET_FORCE_LOW_DMA: + result = get_user(val, ip); + 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, ip); + case SG_GET_SCSI_ID: + if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) + return -EFAULT; + else { + sg_scsi_id_t __user *sg_idp = p; + + 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, ip); + if (result) + return result; + sfp->force_packid = val ? 1 : 0; + return 0; + case SG_GET_PACK_ID: + if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) + return -EFAULT; + 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, ip); + return 0; + } + } + read_unlock_irqrestore(&sfp->rq_list_lock, iflags); + __put_user(-1, ip); + 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, ip); + case SG_GET_SG_TABLESIZE: + return put_user(sdp->sg_tablesize, ip); + case SG_SET_RESERVED_SIZE: + result = get_user(val, ip); + if (result) + return result; + if (val < 0) + return -EINVAL; + 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, ip); + case SG_SET_COMMAND_Q: + result = get_user(val, ip); + if (result) + return result; + sfp->cmd_q = val ? 1 : 0; + return 0; + case SG_GET_COMMAND_Q: + return put_user((int) sfp->cmd_q, ip); + case SG_SET_KEEP_ORPHAN: + result = get_user(val, ip); + if (result) + return result; + sfp->keep_orphan = val; + return 0; + case SG_GET_KEEP_ORPHAN: + return put_user((int) sfp->keep_orphan, ip); + case SG_NEXT_CMD_LEN: + result = get_user(val, ip); + 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, ip); + case SG_GET_ACCESS_COUNT: + /* faked - we don't have a real access count anymore */ + val = (sdp->device ? 1 : 0); + return put_user(val, ip); + case SG_GET_REQUEST_TABLE: + if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) + return -EFAULT; + 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 : + jiffies_to_msecs( + 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); + return (__copy_to_user(p, rinfo, + SZ_SG_REQ_INFO * SG_MAX_QUEUE) ? -EFAULT : 0); + } + case SG_EMULATED_HOST: + if (sdp->detached) + return -ENODEV; + return put_user(sdp->device->host->hostt->emulated, ip); + case SG_SCSI_RESET: + if (sdp->detached) + return -ENODEV; + if (filp->f_flags & O_NONBLOCK) { + if (test_bit(SHOST_RECOVERY, + &sdp->device->host->shost_state)) + return -EBUSY; + } else if (!scsi_block_when_processing_errors(sdp->device)) + return -EBUSY; + result = get_user(val, ip); + if (result) + return result; + if (SG_SCSI_RESET_NOTHING == val) + return 0; + 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; + case SCSI_IOCTL_SEND_COMMAND: + if (sdp->detached) + return -ENODEV; + if (read_only) { + unsigned char opcode = WRITE_6; + Scsi_Ioctl_Command __user *siocp = p; + + if (copy_from_user(&opcode, siocp->data, 1)) + return -EFAULT; + if (!sg_allow_access(opcode, sdp->device->type)) + return -EPERM; + } + return scsi_ioctl_send_command(sdp->device, p); + case SG_SET_DEBUG: + result = get_user(val, ip); + 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, p); + default: + if (read_only) + return -EPERM; /* don't know so take safe approach */ + return scsi_ioctl(sdp->device, cmd_in, p); + } +} + +#ifdef CONFIG_COMPAT +static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) +{ + Sg_device *sdp; + Sg_fd *sfp; + struct scsi_device *sdev; + + if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) + return -ENXIO; + + sdev = sdp->device; + if (sdev->host->hostt->compat_ioctl) { + int ret; + + ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); + + return ret; + } + + return -ENOIOCTLCMD; +} +#endif + +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: %s, res=0x%x\n", + sdp->disk->disk_name, (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: %s, mode=%d\n", + sdp->disk->disk_name, mode)); + + retval = fasync_helper(fd, filp, mode, &sfp->async_qp); + return (retval < 0) ? retval : 0; +} + +static inline unsigned char * +sg_scatg2virt(const struct scatterlist *sclp) +{ + return (sclp && sclp->page) ? + (unsigned char *) page_address(sclp->page) + sclp->offset : NULL; +} + +/* When startFinish==1 increments page counts for pages other than the + first of scatter gather elements obtained from __get_free_pages(). + When startFinish==0 decrements ... */ +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 each 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 = sg_scatg2virt(sclp) + m; + page = virt_to_page(page_ptr); + if (startFinish) + get_page(page); + else { + if (page_count(page) > 0) + __put_page(page); + } + } + } + } 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); + else { + if (page_count(page) > 0) + __put_page(page); + } + } + } +} + +static struct page * +sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type) +{ + 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 = sg_scatg2virt(sclp) + 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 */ + } + if (type) + *type = VM_FAULT_MINOR; + 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 (0 != sclp->offset) + 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(Scsi_Cmnd * SCpnt) +{ + Scsi_Request *SRpnt = NULL; + Sg_device *sdp = NULL; + Sg_fd *sfp; + Sg_request *srp = NULL; + unsigned long iflags; + + if (SCpnt && (SRpnt = SCpnt->sc_request)) + srp = (Sg_request *) SRpnt->upper_private_data; + if (NULL == srp) { + printk(KERN_ERR "sg_cmd_done: NULL request\n"); + if (SRpnt) + scsi_release_request(SRpnt); + return; + } + sfp = srp->parentfp; + if (sfp) + sdp = sfp->parentdp; + if ((NULL == sdp) || sdp->detached) { + printk(KERN_INFO "sg_cmd_done: device detached\n"); + scsi_release_request(SRpnt); + 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_disk = NULL; /* "sg" _disowns_ request blk */ + + srp->my_cmdp = NULL; + + SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", + sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result)); + srp->header.resid = SCpnt->resid; + /* N.B. unit of duration changes here from jiffies to millisecs */ + srp->header.duration = + jiffies_to_msecs(jiffies - srp->header.duration); + if (0 != SRpnt->sr_result) { + struct scsi_sense_hdr sshdr; + + 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", SRpnt); + + /* Following if statement is a patch supplied by Eric Youngdale */ + if (driver_byte(SRpnt->sr_result) != 0 + && scsi_command_normalize_sense(SCpnt, &sshdr) + && !scsi_sense_is_deferred(&sshdr) + && sshdr.sense_key == UNIT_ATTENTION + && sdp->device->removable) { + /* Detected possible 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_cmd_done: 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 */ + scsi_device_put(sdp->device); + } + 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. */ + kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); + write_lock_irqsave(&sfp->rq_list_lock, iflags); + srp->done = 1; + wake_up_interruptible(&sfp->read_wait); + write_unlock_irqrestore(&sfp->rq_list_lock, iflags); + } +} + +static struct file_operations sg_fops = { + .owner = THIS_MODULE, + .read = sg_read, + .write = sg_write, + .poll = sg_poll, + .ioctl = sg_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = sg_compat_ioctl, +#endif + .open = sg_open, + .mmap = sg_mmap, + .release = sg_release, + .fasync = sg_fasync, +}; + +static struct class_simple * sg_sysfs_class; + +static int sg_sysfs_valid = 0; + +static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) +{ + Sg_device *sdp; + unsigned long iflags; + void *old_sg_dev_arr = NULL; + int k, error; + + sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL); + if (!sdp) { + printk(KERN_WARNING "kmalloc Sg_device failure\n"); + return -ENOMEM; + } + + write_lock_irqsave(&sg_dev_arr_lock, iflags); + if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */ + Sg_device **tmp_da; + int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP; + write_unlock_irqrestore(&sg_dev_arr_lock, iflags); + + tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL); + if (unlikely(!tmp_da)) + goto expand_failed; + + write_lock_irqsave(&sg_dev_arr_lock, iflags); + memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *)); + memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *)); + old_sg_dev_arr = sg_dev_arr; + sg_dev_arr = tmp_da; + sg_dev_max = tmp_dev_max; + } + + for (k = 0; k < sg_dev_max; k++) + if (!sg_dev_arr[k]) + break; + if (unlikely(k >= SG_MAX_DEVS)) + goto overflow; + + memset(sdp, 0, sizeof(*sdp)); + SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); + sprintf(disk->disk_name, "sg%d", k); + disk->first_minor = k; + sdp->disk = disk; + sdp->device = scsidp; + init_waitqueue_head(&sdp->o_excl_wait); + sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0; + + sg_nr_dev++; + sg_dev_arr[k] = sdp; + write_unlock_irqrestore(&sg_dev_arr_lock, iflags); + error = k; + + out: + if (error < 0) + kfree(sdp); + kfree(old_sg_dev_arr); + return error; + + expand_failed: + printk(KERN_WARNING "sg_alloc: device array cannot be resized\n"); + error = -ENOMEM; + goto out; + + overflow: + write_unlock_irqrestore(&sg_dev_arr_lock, iflags); + printk(KERN_WARNING + "Unable to attach sg device <%d, %d, %d, %d> type=%d, minor " + "number exceeds %d\n", scsidp->host->host_no, scsidp->channel, + scsidp->id, scsidp->lun, scsidp->type, SG_MAX_DEVS - 1); + error = -ENODEV; + goto out; +} + +static int +sg_add(struct class_device *cl_dev) +{ + struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); + struct gendisk *disk; + Sg_device *sdp = NULL; + struct cdev * cdev = NULL; + int error, k; + + disk = alloc_disk(1); + if (!disk) { + printk(KERN_WARNING "alloc_disk failed\n"); + return -ENOMEM; + } + disk->major = SCSI_GENERIC_MAJOR; + + error = -ENOMEM; + cdev = cdev_alloc(); + if (!cdev) { + printk(KERN_WARNING "cdev_alloc failed\n"); + goto out; + } + cdev->owner = THIS_MODULE; + cdev->ops = &sg_fops; + + error = sg_alloc(disk, scsidp); + if (error < 0) { + printk(KERN_WARNING "sg_alloc failed\n"); + goto out; + } + k = error; + sdp = sg_dev_arr[k]; + + devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k), + S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, + "%s/generic", scsidp->devfs_name); + error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1); + if (error) { + devfs_remove("%s/generic", scsidp->devfs_name); + goto out; + } + sdp->cdev = cdev; + if (sg_sysfs_valid) { + struct class_device * sg_class_member; + + sg_class_member = class_simple_device_add(sg_sysfs_class, + MKDEV(SCSI_GENERIC_MAJOR, k), + cl_dev->dev, "%s", + disk->disk_name); + if (IS_ERR(sg_class_member)) + printk(KERN_WARNING "sg_add: " + "class_simple_device_add failed\n"); + class_set_devdata(sg_class_member, sdp); + error = sysfs_create_link(&scsidp->sdev_gendev.kobj, + &sg_class_member->kobj, "generic"); + if (error) + printk(KERN_ERR "sg_add: unable to make symlink " + "'generic' back to sg%d\n", k); + } else + printk(KERN_WARNING "sg_add: sg_sys INvalid\n"); + + 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; + +out: + put_disk(disk); + if (cdev) + cdev_del(cdev); + return error; +} + +static void +sg_remove(struct class_device *cl_dev) +{ + struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); + Sg_device *sdp = NULL; + 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_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 == sg_srp_done(srp, sfp))) + sg_finish_rem_req(srp); + } + if (sfp->closed) { + scsi_device_put(sdp->device); + __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)); + if (NULL == sdp->headfp) { + sg_dev_arr[k] = NULL; + } + } else { /* nothing active, simple case */ + SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k)); + sg_dev_arr[k] = NULL; + } + sg_nr_dev--; + break; + } + write_unlock_irqrestore(&sg_dev_arr_lock, iflags); + + if (sdp) { + sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); + class_simple_device_remove(MKDEV(SCSI_GENERIC_MAJOR, k)); + cdev_del(sdp->cdev); + sdp->cdev = NULL; + devfs_remove("%s/generic", scsidp->devfs_name); + put_disk(sdp->disk); + sdp->disk = NULL; + if (NULL == sdp->headfp) + kfree((char *) sdp); + } + + if (delay) + msleep(10); /* dirty detach so delay device destruction */ +} + +/* Set 'perm' (4th argument) to 0 to disable module_param's definition + * of sysfs parameters (which module_param doesn't yet support). + * Sysfs parameters defined explicitly below. + */ +module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO); +module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); + +MODULE_AUTHOR("Douglas Gilbert"); +MODULE_DESCRIPTION("SCSI generic (sg) driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(SG_VERSION_STR); + +MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); +MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); + +static int __init +init_sg(void) +{ + int rc; + + if (def_reserved_size >= 0) + sg_big_buff = def_reserved_size; + + rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), + SG_MAX_DEVS, "sg"); + if (rc) + return rc; + sg_sysfs_class = class_simple_create(THIS_MODULE, "scsi_generic"); + if ( IS_ERR(sg_sysfs_class) ) { + rc = PTR_ERR(sg_sysfs_class); + goto err_out; + } + sg_sysfs_valid = 1; + rc = scsi_register_interface(&sg_interface); + if (0 == rc) { +#ifdef CONFIG_SCSI_PROC_FS + sg_proc_init(); +#endif /* CONFIG_SCSI_PROC_FS */ + return 0; + } + class_simple_destroy(sg_sysfs_class); +err_out: + unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); + return rc; +} + +static void __exit +exit_sg(void) +{ +#ifdef CONFIG_SCSI_PROC_FS + sg_proc_cleanup(); +#endif /* CONFIG_SCSI_PROC_FS */ + scsi_unregister_interface(&sg_interface); + class_simple_destroy(sg_sysfs_class); + sg_sysfs_valid = 0; + unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), + SG_MAX_DEVS); + if (sg_dev_arr != NULL) { + kfree((char *) sg_dev_arr); + sg_dev_arr = NULL; + } + sg_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_direct(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_indirect(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)); + 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 ret_sz; + int elem_sz = sizeof (struct scatterlist); + int sg_bufflen = tablesize * elem_sz; + int mx_sc_elems = tablesize; + + schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz); + if (!schp->buffer) + return -ENOMEM; + else if (ret_sz != sg_bufflen) { + sg_bufflen = ret_sz; + mx_sc_elems = sg_bufflen / elem_sz; + } + schp->sglist_len = sg_bufflen; + memset(schp->buffer, 0, sg_bufflen); + return mx_sc_elems; /* number of scat_gath elements allocated */ +} + +#ifdef SG_ALLOW_DIO_CODE +/* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ + /* hopefully this generic code will moved to a library */ + +/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if + - mapping of all pages not successful + - any page is above max_pfn + (i.e., either completely successful or fails) +*/ +static int +st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, + unsigned long uaddr, size_t count, int rw, + unsigned long max_pfn) +{ + int res, i, j; + unsigned int nr_pages; + struct page **pages; + + nr_pages = ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT; + + /* User attempted Overflow! */ + if ((uaddr + count) < uaddr) + return -EINVAL; + + /* Too big */ + if (nr_pages > max_pages) + return -ENOMEM; + + /* Hmm? */ + if (count == 0) + return 0; + + if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) + return -ENOMEM; + + /* Try to fault in all of the necessary pages */ + down_read(¤t->mm->mmap_sem); + /* rw==READ means read from drive, write into memory area */ + res = get_user_pages( + current, + current->mm, + uaddr, + nr_pages, + rw == READ, + 0, /* don't force */ + pages, + NULL); + up_read(¤t->mm->mmap_sem); + + /* Errors and no page mapped should return here */ + if (res < nr_pages) + goto out_unmap; + + for (i=0; i < nr_pages; i++) { + /* FIXME: flush superflous for rw==READ, + * probably wrong function for rw==WRITE + */ + flush_dcache_page(pages[i]); + if (page_to_pfn(pages[i]) > max_pfn) + goto out_unlock; + /* ?? Is locking needed? I don't think so */ + /* if (TestSetPageLocked(pages[i])) + goto out_unlock; */ + } + + /* Populate the scatter/gather list */ + sgl[0].page = pages[0]; + sgl[0].offset = uaddr & ~PAGE_MASK; + if (nr_pages > 1) { + sgl[0].length = PAGE_SIZE - sgl[0].offset; + count -= sgl[0].length; + for (i=1; i < nr_pages ; i++) { + sgl[i].offset = 0; + sgl[i].page = pages[i]; + sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; + count -= PAGE_SIZE; + } + } + else { + sgl[0].length = count; + } + + kfree(pages); + return nr_pages; + + out_unlock: + /* for (j=0; j < i; j++) + unlock_page(pages[j]); */ + res = 0; + out_unmap: + if (res > 0) + for (j=0; j < res; j++) + page_cache_release(pages[j]); + kfree(pages); + return res; +} + + +/* And unmap them... */ +static int +st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, + int dirtied) +{ + int i; + + for (i=0; i < nr_pages; i++) { + if (dirtied && !PageReserved(sgl[i].page)) + SetPageDirty(sgl[i].page); + /* unlock_page(sgl[i].page); */ + /* FIXME: cache flush missing for rw==READ + * FIXME: call the correct reference counting function + */ + page_cache_release(sgl[i].page); + } + + return 0; +} + +/* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ +#endif + + +/* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ +static int +sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) +{ +#ifdef SG_ALLOW_DIO_CODE + sg_io_hdr_t *hp = &srp->header; + Sg_scatter_hold *schp = &srp->data; + int sg_tablesize = sfp->parentdp->sg_tablesize; + struct scatterlist *sgl; + int mx_sc_elems, res; + struct scsi_device *sdev = sfp->parentdp->device; + + if (((unsigned long)hp->dxferp & + queue_dma_alignment(sdev->request_queue)) != 0) + return 1; + mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); + if (mx_sc_elems <= 0) { + return 1; + } + sgl = (struct scatterlist *)schp->buffer; + res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len, + (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX); + if (res <= 0) + return 1; + schp->k_use_sg = res; + schp->dio_in_use = 1; + hp->info |= SG_INFO_DIRECT_IO; + return 0; +#else + return 1; +#endif +} + +static int +sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) +{ + int ret_sz; + int blk_size = buff_size; + unsigned 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_indirect: buff_size=%d, blk_size=%d\n", + buff_size, blk_size)); + if (blk_size <= SG_SCATTER_SZ) { + p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz); + 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->b_malloc_len = blk_size; + return 0; + } + } else { + p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz); + 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; + + /* N.B. ret_sz 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 */ + + 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; + p = sg_page_malloc(num, sfp->low_dma, &ret_sz); + if (!p) + break; + } + sclp->page = virt_to_page(p); + sclp->offset = offset_in_page(p); + sclp->length = ret_sz; + + SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n", + k, sg_scatg2virt(sclp), ret_sz)); + } /* end of for loop */ + schp->k_use_sg = k; + SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: 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; + int iovec_count = (int) hp->iovec_count; + int dxfer_dir = hp->dxfer_direction; + unsigned char *p; + unsigned char __user *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) || (schp->dio_in_use) || + (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 (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) + return -EFAULT; + } else + onum = 1; + + if (0 == schp->k_use_sg) { /* kernel has single buffer */ + 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; + if (__copy_from_user(p, up, usglen)) + return -EFAULT; + p += usglen; + num_xfer -= usglen; + if (num_xfer <= 0) + return 0; + } + } else { /* kernel using scatter gather list */ + struct scatterlist *sclp = (struct scatterlist *) schp->buffer; + + ksglen = (int) sclp->length; + p = sg_scatg2virt(sclp); + for (j = 0, k = 0; j < onum; ++j) { + res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); + if (res) + return res; + + for (; p; ++sclp, ksglen = (int) sclp->length, + p = sg_scatg2virt(sclp)) { + if (usglen <= 0) + break; + if (ksglen > usglen) { + if (usglen >= num_xfer) { + if (__copy_from_user + (p, up, num_xfer)) + return -EFAULT; + return 0; + } + if (__copy_from_user(p, up, usglen)) + return -EFAULT; + p += usglen; + ksglen -= usglen; + break; + } else { + if (ksglen >= num_xfer) { + if (__copy_from_user + (p, up, num_xfer)) + return -EFAULT; + return 0; + } + if (__copy_from_user(p, up, ksglen)) + return -EFAULT; + up += ksglen; + usglen -= ksglen; + } + ++k; + if (k >= schp->k_use_sg) + return 0; + } + } + } + return 0; +} + +static int +sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, + int wr_xf, int *countp, unsigned char __user **up) +{ + int num_xfer = (int) hp->dxfer_len; + unsigned char __user *p = hp->dxferp; + int count; + + if (0 == sg_num) { + if (wr_xf && ('\0' == hp->interface_id)) + count = (int) hp->flags; /* holds "old" input_size */ + else + count = num_xfer; + } else { + sg_iovec_t iovec; + if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) + return -EFAULT; + p = iovec.iov_base; + count = (int) iovec.iov_len; + } + if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) + return -EFAULT; + if (up) + *up = p; + if (countp) + *countp = count; + return 0; +} + +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 > 0)) { + struct scatterlist *sclp = (struct scatterlist *) schp->buffer; + + if (schp->dio_in_use) { +#ifdef SG_ALLOW_DIO_CODE + st_unmap_user_pages(sclp, schp->k_use_sg, TRUE); +#endif + } else { + int k; + + for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp); + ++k, ++sclp) { + SCSI_LOG_TIMEOUT(5, printk( + "sg_remove_scat: k=%d, a=0x%p, len=%d\n", + k, sg_scatg2virt(sclp), sclp->length)); + sg_page_free(sg_scatg2virt(sclp), sclp->length); + sclp->page = NULL; + sclp->offset = 0; + sclp->length = 0; + } + } + sg_page_free(schp->buffer, schp->sglist_len); + } else if (schp->buffer) + sg_page_free(schp->buffer, schp->b_malloc_len); + 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; + int iovec_count = (int) hp->iovec_count; + int dxfer_dir = hp->dxfer_direction; + unsigned char *p; + unsigned char __user *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) || (schp->dio_in_use) || + (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 (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) + return -EFAULT; + } else + onum = 1; + + if (0 == schp->k_use_sg) { /* kernel has single buffer */ + 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; + if (__copy_to_user(up, p, usglen)) + return -EFAULT; + p += usglen; + num_xfer -= usglen; + if (num_xfer <= 0) + return 0; + } + } else { /* kernel using scatter gather list */ + struct scatterlist *sclp = (struct scatterlist *) schp->buffer; + + ksglen = (int) sclp->length; + p = sg_scatg2virt(sclp); + for (j = 0, k = 0; j < onum; ++j) { + res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); + if (res) + return res; + + for (; p; ++sclp, ksglen = (int) sclp->length, + p = sg_scatg2virt(sclp)) { + if (usglen <= 0) + break; + if (ksglen > usglen) { + if (usglen >= num_xfer) { + if (__copy_to_user + (up, p, num_xfer)) + return -EFAULT; + return 0; + } + if (__copy_to_user(up, p, usglen)) + return -EFAULT; + p += usglen; + ksglen -= usglen; + break; + } else { + if (ksglen >= num_xfer) { + if (__copy_to_user + (up, p, num_xfer)) + return -EFAULT; + return 0; + } + if (__copy_to_user(up, p, ksglen)) + return -EFAULT; + up += ksglen; + usglen -= ksglen; + } + ++k; + if (k >= schp->k_use_sg) + return 0; + } + } + } + return 0; +} + +static int +sg_read_oxfer(Sg_request * srp, char __user *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 0; + if (schp->k_use_sg > 0) { + int k, num; + struct scatterlist *sclp = (struct scatterlist *) schp->buffer; + + for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp); + ++k, ++sclp) { + num = (int) sclp->length; + if (num > num_read_xfer) { + if (__copy_to_user + (outp, sg_scatg2virt(sclp), num_read_xfer)) + return -EFAULT; + break; + } else { + if (__copy_to_user + (outp, sg_scatg2virt(sclp), num)) + return -EFAULT; + num_read_xfer -= num; + if (num_read_xfer <= 0) + break; + outp += num; + } + } + } else { + if (__copy_to_user(outp, schp->buffer, num_read_xfer)) + return -EFAULT; + } + return 0; +} + +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_indirect(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 = sg_scatg2virt(sclp); + } 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->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->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_SCSI_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; + } + 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_SCSI_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_page_malloc(sizeof (Sg_fd), 0, NULL); + if (!sfp) + return NULL; + memset(sfp, 0, sizeof (Sg_fd)); + init_waitqueue_head(&sfp->read_wait); + rwlock_init(&sfp->rq_list_lock); + + sfp->timeout = SG_DEFAULT_TIMEOUT; + sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; + 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\n", sfp)); + 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_page_free((char *) sfp, sizeof (Sg_fd)); +} + +/* 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 (sg_srp_done(srp, sfp)) + 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_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 { + /* MOD_INC's to inhibit unloading sg and associated adapter driver */ + /* only bump the access_count if we actually succeeded in + * throwing another counter on the host module */ + scsi_device_get(sdp->device); /* XXX: retval ignored? */ + sfp->closed = 1; /* flag dirty state on this fd */ + 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_page_malloc(int rqSz, int lowDma, int *retSzp) +{ + char *resp = NULL; + int page_mask; + int order, a_size; + int resSz = rqSz; + + if (rqSz <= 0) + return resp; + + if (lowDma) + page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN; + else + page_mask = GFP_ATOMIC | __GFP_NOWARN; + + 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; + } + return resp; +} + +static void +sg_page_free(char *buff, int size) +{ + int order, a_size; + + if (!buff) + return; + for (order = 0, a_size = PAGE_SIZE; a_size < size; + order++, a_size <<= 1) ; + free_pages((unsigned long) buff, order); +} + +#ifndef MAINTENANCE_IN_CMD +#define MAINTENANCE_IN_CMD 0xa3 +#endif + +static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, + INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, + READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, + SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD +}; + +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_SCSI_PROC_FS +static int +sg_last_dev(void) +{ + int k; + unsigned long iflags; + + read_lock_irqsave(&sg_dev_arr_lock, iflags); + for (k = sg_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_dev_max) + sdp = sg_dev_arr[dev]; + read_unlock_irqrestore(&sg_dev_arr_lock, iflags); + } + return sdp; +} + +#ifdef CONFIG_SCSI_PROC_FS + +static struct proc_dir_entry *sg_proc_sgp = NULL; + +static char sg_proc_sg_dirname[] = "scsi/sg"; + +static int sg_proc_seq_show_int(struct seq_file *s, void *v); + +static int sg_proc_single_open_adio(struct inode *inode, struct file *file); +static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, + size_t count, loff_t *off); +static struct file_operations adio_fops = { + /* .owner, .read and .llseek added in sg_proc_init() */ + .open = sg_proc_single_open_adio, + .write = sg_proc_write_adio, + .release = single_release, +}; + +static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); +static ssize_t sg_proc_write_dressz(struct file *filp, + const char __user *buffer, size_t count, loff_t *off); +static struct file_operations dressz_fops = { + .open = sg_proc_single_open_dressz, + .write = sg_proc_write_dressz, + .release = single_release, +}; + +static int sg_proc_seq_show_version(struct seq_file *s, void *v); +static int sg_proc_single_open_version(struct inode *inode, struct file *file); +static struct file_operations version_fops = { + .open = sg_proc_single_open_version, + .release = single_release, +}; + +static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); +static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); +static struct file_operations devhdr_fops = { + .open = sg_proc_single_open_devhdr, + .release = single_release, +}; + +static int sg_proc_seq_show_dev(struct seq_file *s, void *v); +static int sg_proc_open_dev(struct inode *inode, struct file *file); +static void * dev_seq_start(struct seq_file *s, loff_t *pos); +static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); +static void dev_seq_stop(struct seq_file *s, void *v); +static struct file_operations dev_fops = { + .open = sg_proc_open_dev, + .release = seq_release, +}; +static struct seq_operations dev_seq_ops = { + .start = dev_seq_start, + .next = dev_seq_next, + .stop = dev_seq_stop, + .show = sg_proc_seq_show_dev, +}; + +static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); +static int sg_proc_open_devstrs(struct inode *inode, struct file *file); +static struct file_operations devstrs_fops = { + .open = sg_proc_open_devstrs, + .release = seq_release, +}; +static struct seq_operations devstrs_seq_ops = { + .start = dev_seq_start, + .next = dev_seq_next, + .stop = dev_seq_stop, + .show = sg_proc_seq_show_devstrs, +}; + +static int sg_proc_seq_show_debug(struct seq_file *s, void *v); +static int sg_proc_open_debug(struct inode *inode, struct file *file); +static struct file_operations debug_fops = { + .open = sg_proc_open_debug, + .release = seq_release, +}; +static struct seq_operations debug_seq_ops = { + .start = dev_seq_start, + .next = dev_seq_next, + .stop = dev_seq_stop, + .show = sg_proc_seq_show_debug, +}; + + +struct sg_proc_leaf { + const char * name; + struct file_operations * fops; +}; + +static struct sg_proc_leaf sg_proc_leaf_arr[] = { + {"allow_dio", &adio_fops}, + {"debug", &debug_fops}, + {"def_reserved_size", &dressz_fops}, + {"device_hdr", &devhdr_fops}, + {"devices", &dev_fops}, + {"device_strs", &devstrs_fops}, + {"version", &version_fops} +}; + +static int +sg_proc_init(void) +{ + int k, mask; + int num_leaves = + sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); + struct proc_dir_entry *pdep; + struct sg_proc_leaf * leaf; + + sg_proc_sgp = create_proc_entry(sg_proc_sg_dirname, + S_IFDIR | S_IRUGO | S_IXUGO, NULL); + if (!sg_proc_sgp) + return 1; + for (k = 0; k < num_leaves; ++k) { + leaf = &sg_proc_leaf_arr[k]; + mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; + pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); + if (pdep) { + leaf->fops->owner = THIS_MODULE, + leaf->fops->read = seq_read, + leaf->fops->llseek = seq_lseek, + pdep->proc_fops = leaf->fops; + } + } + return 0; +} + +static void +sg_proc_cleanup(void) +{ + int k; + int num_leaves = + sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); + + if (!sg_proc_sgp) + return; + for (k = 0; k < num_leaves; ++k) + remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); + remove_proc_entry(sg_proc_sg_dirname, NULL); +} + + +static int sg_proc_seq_show_int(struct seq_file *s, void *v) +{ + seq_printf(s, "%d\n", *((int *)s->private)); + return 0; +} + +static int sg_proc_single_open_adio(struct inode *inode, struct file *file) +{ + return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); +} + +static ssize_t +sg_proc_write_adio(struct file *filp, const char __user *buffer, + size_t count, loff_t *off) +{ + int num; + char buff[11]; + + if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) + return -EACCES; + num = (count < 10) ? count : 10; + if (copy_from_user(buff, buffer, num)) + return -EFAULT; + buff[num] = '\0'; + sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; + return count; +} + +static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) +{ + return single_open(file, sg_proc_seq_show_int, &sg_big_buff); +} + +static ssize_t +sg_proc_write_dressz(struct file *filp, const char __user *buffer, + size_t count, loff_t *off) +{ + 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; + if (copy_from_user(buff, buffer, num)) + return -EFAULT; + buff[num] = '\0'; + k = simple_strtoul(buff, NULL, 10); + if (k <= 1048576) { /* limit "big buff" to 1 MB */ + sg_big_buff = k; + return count; + } + return -ERANGE; +} + +static int sg_proc_seq_show_version(struct seq_file *s, void *v) +{ + seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, + sg_version_date); + return 0; +} + +static int sg_proc_single_open_version(struct inode *inode, struct file *file) +{ + return single_open(file, sg_proc_seq_show_version, NULL); +} + +static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) +{ + seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" + "online\n"); + return 0; +} + +static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) +{ + return single_open(file, sg_proc_seq_show_devhdr, NULL); +} + +struct sg_proc_deviter { + loff_t index; + size_t max; +}; + +static void * dev_seq_start(struct seq_file *s, loff_t *pos) +{ + struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); + + if (! it) + return NULL; + if (NULL == sg_dev_arr) + goto err1; + it->index = *pos; + it->max = sg_last_dev(); + if (it->index >= it->max) + goto err1; + return it; +err1: + kfree(it); + return NULL; +} + +static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) +{ + struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; + + *pos = ++it->index; + return (it->index < it->max) ? it : NULL; +} + +static void dev_seq_stop(struct seq_file *s, void *v) +{ + kfree (v); +} + +static int sg_proc_open_dev(struct inode *inode, struct file *file) +{ + return seq_open(file, &dev_seq_ops); +} + +static int sg_proc_seq_show_dev(struct seq_file *s, void *v) +{ + struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; + Sg_device *sdp; + struct scsi_device *scsidp; + + sdp = it ? sg_get_dev(it->index) : NULL; + if (sdp && (scsidp = sdp->device) && (!sdp->detached)) + seq_printf(s, "%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, + 1, + (int) scsidp->queue_depth, + (int) scsidp->device_busy, + (int) scsi_device_online(scsidp)); + else + seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); + return 0; +} + +static int sg_proc_open_devstrs(struct inode *inode, struct file *file) +{ + return seq_open(file, &devstrs_seq_ops); +} + +static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) +{ + struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; + Sg_device *sdp; + struct scsi_device *scsidp; + + sdp = it ? sg_get_dev(it->index) : NULL; + if (sdp && (scsidp = sdp->device) && (!sdp->detached)) + seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", + scsidp->vendor, scsidp->model, scsidp->rev); + else + seq_printf(s, "<no active device>\n"); + return 0; +} + +static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) +{ + int k, m, new_interface, blen, usg; + Sg_request *srp; + Sg_fd *fp; + const sg_io_hdr_t *hp; + const char * cp; + + for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { + seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " + "(res)sgat=%d low_dma=%d\n", k + 1, + jiffies_to_msecs(fp->timeout), + fp->reserve.bufflen, + (int) fp->reserve.k_use_sg, + (int) fp->low_dma); + seq_printf(s, " 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; + if (srp->res_used) { + if (new_interface && + (SG_FLAG_MMAP_IO & hp->flags)) + cp = " mmap>> "; + else + cp = " rb>> "; + } else { + if (SG_INFO_DIRECT_IO_MASK & hp->info) + cp = " dio>> "; + else + cp = " "; + } + seq_printf(s, cp); + 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; + seq_printf(s, srp->done ? + ((1 == srp->done) ? "rcv:" : "fin:") + : (srp->my_cmdp ? "act:" : "prior:")); + seq_printf(s, " id=%d blen=%d", + srp->header.pack_id, blen); + if (srp->done) + seq_printf(s, " dur=%d", hp->duration); + else + seq_printf(s, " t_o/elap=%d/%d", + new_interface ? hp->timeout : jiffies_to_msecs(fp->timeout), + jiffies_to_msecs(hp->duration ? (jiffies - hp->duration) : 0)); + seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, + (int) srp->data.cmd_opcode); + } + if (0 == m) + seq_printf(s, " No requests active\n"); + } +} + +static int sg_proc_open_debug(struct inode *inode, struct file *file) +{ + return seq_open(file, &debug_seq_ops); +} + +static int sg_proc_seq_show_debug(struct seq_file *s, void *v) +{ + struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; + Sg_device *sdp; + + if (it && (0 == it->index)) { + seq_printf(s, "dev_max(currently)=%d max_active_device=%d " + "(origin 1)\n", sg_dev_max, (int)it->max); + seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); + } + sdp = it ? sg_get_dev(it->index) : NULL; + if (sdp) { + struct scsi_device *scsidp = sdp->device; + + if (NULL == scsidp) { + seq_printf(s, "device %d detached ??\n", + (int)it->index); + return 0; + } + + if (sg_get_nth_sfp(sdp, 0)) { + seq_printf(s, " >>> device=%s ", + sdp->disk->disk_name); + if (sdp->detached) + seq_printf(s, "detached pending close "); + else + seq_printf + (s, "scsi%d chan=%d id=%d lun=%d em=%d", + scsidp->host->host_no, + scsidp->channel, scsidp->id, + scsidp->lun, + scsidp->host->hostt->emulated); + seq_printf(s, " sg_tablesize=%d excl=%d\n", + sdp->sg_tablesize, sdp->exclude); + } + sg_proc_debug_helper(s, sdp); + } + return 0; +} + +#endif /* CONFIG_SCSI_PROC_FS */ + +module_init(init_sg); +module_exit(exit_sg); +MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |