| /* |
| * 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 = 30534; /* 2 digits for each component */ |
| #define SG_VERSION_STR "3.5.34" |
| |
| /* |
| * 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/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/moduleparam.h> |
| #include <linux/cdev.h> |
| #include <linux/idr.h> |
| #include <linux/seq_file.h> |
| #include <linux/blkdev.h> |
| #include <linux/delay.h> |
| #include <linux/scatterlist.h> |
| #include <linux/blktrace_api.h> |
| #include <linux/smp_lock.h> |
| |
| #include "scsi.h" |
| #include <scsi/scsi_dbg.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 = "20061027"; |
| |
| static int sg_proc_init(void); |
| static void sg_proc_cleanup(void); |
| #endif |
| |
| #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; |
| |
| static int scatter_elem_sz = SG_SCATTER_SZ; |
| static int scatter_elem_sz_prev = SG_SCATTER_SZ; |
| |
| #define SG_SECTOR_SZ 512 |
| #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) |
| |
| static int sg_add(struct device *, struct class_interface *); |
| static void sg_remove(struct device *, struct class_interface *); |
| |
| static DEFINE_IDR(sg_index_idr); |
| static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock |
| file descriptor list for device */ |
| |
| static struct class_interface sg_interface = { |
| .add_dev = sg_add, |
| .remove_dev = 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 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 */ |
| struct scatterlist *buffer;/* scatter list */ |
| 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 */ |
| 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[SCSI_SENSE_BUFFERSIZE]; |
| 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 */ |
| u32 index; /* device index number */ |
| 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); |
| /* tasklet or soft irq callback */ |
| static void sg_cmd_done(void *data, char *sense, int result, int resid); |
| 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, struct file *file, |
| 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 struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); |
| static void sg_page_free(struct page *page, 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_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); |
| static Sg_device *sg_get_dev(int dev); |
| #ifdef CONFIG_SCSI_PROC_FS |
| static int sg_last_dev(void); |
| #endif |
| |
| #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; |
| struct request_queue *q; |
| Sg_device *sdp; |
| Sg_fd *sfp; |
| int res; |
| int retval; |
| |
| lock_kernel(); |
| 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)) { |
| unlock_kernel(); |
| return -ENXIO; |
| } |
| if (sdp->detached) { |
| unlock_kernel(); |
| 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) { |
| unlock_kernel(); |
| 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; |
| q = sdp->device->request_queue; |
| sdp->sg_tablesize = min(q->max_hw_segments, |
| q->max_phys_segments); |
| } |
| 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; |
| } |
| unlock_kernel(); |
| return 0; |
| |
| error_out: |
| scsi_device_put(sdp->device); |
| unlock_kernel(); |
| 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) |
| { |
| Sg_device *sdp; |
| Sg_fd *sfp; |
| Sg_request *srp; |
| int req_pack_id = -1; |
| sg_io_hdr_t *hp; |
| struct sg_header *old_hdr = NULL; |
| int retval = 0; |
| |
| 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)) { |
| old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
| if (!old_hdr) |
| return -ENOMEM; |
| if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { |
| retval = -EFAULT; |
| goto free_old_hdr; |
| } |
| if (old_hdr->reply_len < 0) { |
| if (count >= SZ_SG_IO_HDR) { |
| sg_io_hdr_t *new_hdr; |
| new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); |
| if (!new_hdr) { |
| retval = -ENOMEM; |
| goto free_old_hdr; |
| } |
| retval =__copy_from_user |
| (new_hdr, buf, SZ_SG_IO_HDR); |
| req_pack_id = new_hdr->pack_id; |
| kfree(new_hdr); |
| if (retval) { |
| retval = -EFAULT; |
| goto free_old_hdr; |
| } |
| } |
| } 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) { |
| retval = -ENODEV; |
| goto free_old_hdr; |
| } |
| if (filp->f_flags & O_NONBLOCK) { |
| retval = -EAGAIN; |
| goto free_old_hdr; |
| } |
| while (1) { |
| retval = 0; /* following macro beats race condition */ |
| __wait_event_interruptible(sfp->read_wait, |
| (sdp->detached || |
| (srp = sg_get_rq_mark(sfp, req_pack_id))), |
| retval); |
| if (sdp->detached) { |
| retval = -ENODEV; |
| goto free_old_hdr; |
| } |
| if (0 == retval) |
| break; |
| |
| /* -ERESTARTSYS as signal hit process */ |
| goto free_old_hdr; |
| } |
| } |
| if (srp->header.interface_id != '\0') { |
| retval = sg_new_read(sfp, buf, count, srp); |
| goto free_old_hdr; |
| } |
| |
| hp = &srp->header; |
| if (old_hdr == NULL) { |
| old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
| if (! old_hdr) { |
| retval = -ENOMEM; |
| goto free_old_hdr; |
| } |
| } |
| memset(old_hdr, 0, SZ_SG_HEADER); |
| old_hdr->reply_len = (int) hp->timeout; |
| old_hdr->pack_len = old_hdr->reply_len; /* 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)) { |
| retval = -EFAULT; |
| goto free_old_hdr; |
| } |
| buf += SZ_SG_HEADER; |
| if (count > old_hdr->reply_len) |
| count = old_hdr->reply_len; |
| if (count > SZ_SG_HEADER) { |
| if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
| retval = -EFAULT; |
| goto free_old_hdr; |
| } |
| } |
| } else |
| count = (old_hdr->result == 0) ? 0 : -EIO; |
| sg_finish_rem_req(srp); |
| retval = count; |
| free_old_hdr: |
| kfree(old_hdr); |
| return retval; |
| } |
| |
| 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 = SCSI_SENSE_BUFFERSIZE; |
| 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[MAX_COMMAND_SIZE]; |
| |
| 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, filp, 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) { |
| static char cmd[TASK_COMM_LEN]; |
| if (strcmp(current->comm, cmd) && 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); |
| strcpy(cmd, 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, struct file *file, 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[MAX_COMMAND_SIZE]; |
| 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 && !blk_verify_command(file, cmnd)) { |
| 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, data_dir; |
| Sg_device *sdp = sfp->parentdp; |
| sg_io_hdr_t *hp = &srp->header; |
| |
| 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_common_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_common_write: write_xfer, bad address\n")); |
| sg_finish_rem_req(srp); |
| return k; |
| } |
| if (sdp->detached) { |
| sg_finish_rem_req(srp); |
| return -ENODEV; |
| } |
| |
| switch (hp->dxfer_direction) { |
| case SG_DXFER_TO_FROM_DEV: |
| case SG_DXFER_FROM_DEV: |
| data_dir = DMA_FROM_DEVICE; |
| break; |
| case SG_DXFER_TO_DEV: |
| data_dir = DMA_TO_DEVICE; |
| break; |
| case SG_DXFER_UNKNOWN: |
| data_dir = DMA_BIDIRECTIONAL; |
| break; |
| default: |
| data_dir = DMA_NONE; |
| break; |
| } |
| hp->duration = jiffies_to_msecs(jiffies); |
| /* 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). */ |
| if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, |
| hp->dxfer_len, srp->data.k_use_sg, timeout, |
| SG_DEFAULT_RETRIES, srp, sg_cmd_done, |
| GFP_ATOMIC)) { |
| SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n")); |
| /* |
| * most likely out of mem, but could also be a bad map |
| */ |
| sg_finish_rem_req(srp); |
| return -ENOMEM; |
| } else |
| 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, filp, 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; |
| val = min_t(int, val, |
| sdp->device->request_queue->max_sectors * 512); |
| 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 = min_t(int, sfp->reserve.bufflen, |
| sdp->device->request_queue->max_sectors * 512); |
| 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; |
| unsigned int ms; |
| |
| rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, |
| GFP_KERNEL); |
| if (!rinfo) |
| return -ENOMEM; |
| 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; |
| if (srp->done) |
| rinfo[val].duration = |
| srp->header.duration; |
| else { |
| ms = jiffies_to_msecs(jiffies); |
| rinfo[val].duration = |
| (ms > srp->header.duration) ? |
| (ms - srp->header.duration) : 0; |
| } |
| 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); |
| result = __copy_to_user(p, rinfo, |
| SZ_SG_REQ_INFO * SG_MAX_QUEUE); |
| result = result ? -EFAULT : 0; |
| kfree(rinfo); |
| return result; |
| } |
| 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 (scsi_host_in_recovery(sdp->device->host)) |
| 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_TARGET: |
| val = SCSI_TRY_RESET_TARGET; |
| 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 (!blk_verify_command(filp, &opcode)) |
| return -EPERM; |
| } |
| return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, 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); |
| case BLKSECTGET: |
| return put_user(sdp->device->request_queue->max_sectors * 512, |
| ip); |
| case BLKTRACESETUP: |
| return blk_trace_setup(sdp->device->request_queue, |
| sdp->disk->disk_name, |
| sdp->device->sdev_gendev.devt, |
| (char *)arg); |
| case BLKTRACESTART: |
| return blk_trace_startstop(sdp->device->request_queue, 1); |
| case BLKTRACESTOP: |
| return blk_trace_startstop(sdp->device->request_queue, 0); |
| case BLKTRACETEARDOWN: |
| return blk_trace_remove(sdp->device->request_queue); |
| 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 int |
| sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| Sg_fd *sfp; |
| unsigned long offset, len, sa; |
| Sg_scatter_hold *rsv_schp; |
| struct scatterlist *sg; |
| int k; |
| |
| if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) |
| return VM_FAULT_SIGBUS; |
| rsv_schp = &sfp->reserve; |
| offset = vmf->pgoff << PAGE_SHIFT; |
| if (offset >= rsv_schp->bufflen) |
| return VM_FAULT_SIGBUS; |
| SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", |
| offset, rsv_schp->k_use_sg)); |
| sg = rsv_schp->buffer; |
| sa = vma->vm_start; |
| for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); |
| ++k, sg = sg_next(sg)) { |
| len = vma->vm_end - sa; |
| len = (len < sg->length) ? len : sg->length; |
| if (offset < len) { |
| struct page *page; |
| page = virt_to_page(page_address(sg_page(sg)) + offset); |
| get_page(page); /* increment page count */ |
| vmf->page = page; |
| return 0; /* success */ |
| } |
| sa += len; |
| offset -= len; |
| } |
| |
| return VM_FAULT_SIGBUS; |
| } |
| |
| static struct vm_operations_struct sg_mmap_vm_ops = { |
| .fault = sg_vma_fault, |
| }; |
| |
| static int |
| sg_mmap(struct file *filp, struct vm_area_struct *vma) |
| { |
| Sg_fd *sfp; |
| unsigned long req_sz, len, sa; |
| Sg_scatter_hold *rsv_schp; |
| int k; |
| struct scatterlist *sg; |
| |
| if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) |
| return -ENXIO; |
| req_sz = vma->vm_end - vma->vm_start; |
| 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 */ |
| |
| sa = vma->vm_start; |
| sg = rsv_schp->buffer; |
| for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); |
| ++k, sg = sg_next(sg)) { |
| len = vma->vm_end - sa; |
| len = (len < sg->length) ? len : sg->length; |
| sa += len; |
| } |
| |
| sfp->mmap_called = 1; |
| vma->vm_flags |= VM_RESERVED; |
| 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(void *data, char *sense, int result, int resid) |
| { |
| Sg_request *srp = data; |
| Sg_device *sdp = NULL; |
| Sg_fd *sfp; |
| unsigned long iflags; |
| unsigned int ms; |
| |
| if (NULL == srp) { |
| printk(KERN_ERR "sg_cmd_done: NULL request\n"); |
| return; |
| } |
| sfp = srp->parentfp; |
| if (sfp) |
| sdp = sfp->parentdp; |
| if ((NULL == sdp) || sdp->detached) { |
| printk(KERN_INFO "sg_cmd_done: device detached\n"); |
| return; |
| } |
| |
| |
| SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", |
| sdp->disk->disk_name, srp->header.pack_id, result)); |
| srp->header.resid = resid; |
| ms = jiffies_to_msecs(jiffies); |
| srp->header.duration = (ms > srp->header.duration) ? |
| (ms - srp->header.duration) : 0; |
| if (0 != result) { |
| struct scsi_sense_hdr sshdr; |
| |
| memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); |
| srp->header.status = 0xff & result; |
| srp->header.masked_status = status_byte(result); |
| srp->header.msg_status = msg_byte(result); |
| srp->header.host_status = host_byte(result); |
| srp->header.driver_status = driver_byte(result); |
| if ((sdp->sgdebug > 0) && |
| ((CHECK_CONDITION == srp->header.masked_status) || |
| (COMMAND_TERMINATED == srp->header.masked_status))) |
| __scsi_print_sense("sg_cmd_done", sense, |
| SCSI_SENSE_BUFFERSIZE); |
| |
| /* Following if statement is a patch supplied by Eric Youngdale */ |
| if (driver_byte(result) != 0 |
| && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &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" */ |
| |
| 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_cmd_done: 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 *sg_sysfs_class; |
| |
| static int sg_sysfs_valid = 0; |
| |
| static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) |
| { |
| struct request_queue *q = scsidp->request_queue; |
| Sg_device *sdp; |
| unsigned long iflags; |
| int error; |
| u32 k; |
| |
| sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); |
| if (!sdp) { |
| printk(KERN_WARNING "kmalloc Sg_device failure\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| error = -ENOMEM; |
| if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { |
| printk(KERN_WARNING "idr expansion Sg_device failure\n"); |
| goto out; |
| } |
| |
| write_lock_irqsave(&sg_index_lock, iflags); |
| error = idr_get_new(&sg_index_idr, sdp, &k); |
| write_unlock_irqrestore(&sg_index_lock, iflags); |
| |
| if (error) { |
| printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", |
| error); |
| goto out; |
| } |
| |
| if (unlikely(k >= SG_MAX_DEVS)) |
| goto overflow; |
| |
| 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 = min(q->max_hw_segments, q->max_phys_segments); |
| sdp->index = k; |
| |
| error = 0; |
| out: |
| if (error) { |
| kfree(sdp); |
| return ERR_PTR(error); |
| } |
| return sdp; |
| |
| overflow: |
| sdev_printk(KERN_WARNING, scsidp, |
| "Unable to attach sg device type=%d, minor " |
| "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); |
| error = -ENODEV; |
| goto out; |
| } |
| |
| static int |
| sg_add(struct device *cl_dev, struct class_interface *cl_intf) |
| { |
| struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
| struct gendisk *disk; |
| Sg_device *sdp = NULL; |
| struct cdev * cdev = NULL; |
| int error; |
| unsigned long iflags; |
| |
| 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; |
| |
| sdp = sg_alloc(disk, scsidp); |
| if (IS_ERR(sdp)) { |
| printk(KERN_WARNING "sg_alloc failed\n"); |
| error = PTR_ERR(sdp); |
| goto out; |
| } |
| |
| error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); |
| if (error) |
| goto cdev_add_err; |
| |
| sdp->cdev = cdev; |
| if (sg_sysfs_valid) { |
| struct device *sg_class_member; |
| |
| sg_class_member = device_create_drvdata(sg_sysfs_class, |
| cl_dev->parent, |
| MKDEV(SCSI_GENERIC_MAJOR, |
| sdp->index), |
| sdp, |
| "%s", disk->disk_name); |
| if (IS_ERR(sg_class_member)) { |
| printk(KERN_ERR "sg_add: " |
| "device_create failed\n"); |
| error = PTR_ERR(sg_class_member); |
| goto cdev_add_err; |
| } |
| 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", sdp->index); |
| } else |
| printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); |
| |
| sdev_printk(KERN_NOTICE, scsidp, |
| "Attached scsi generic sg%d type %d\n", sdp->index, |
| scsidp->type); |
| |
| dev_set_drvdata(cl_dev, sdp); |
| |
| return 0; |
| |
| cdev_add_err: |
| write_lock_irqsave(&sg_index_lock, iflags); |
| idr_remove(&sg_index_idr, sdp->index); |
| write_unlock_irqrestore(&sg_index_lock, iflags); |
| kfree(sdp); |
| |
| out: |
| put_disk(disk); |
| if (cdev) |
| cdev_del(cdev); |
| return error; |
| } |
| |
| static void |
| sg_remove(struct device *cl_dev, struct class_interface *cl_intf) |
| { |
| struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
| Sg_device *sdp = dev_get_drvdata(cl_dev); |
| unsigned long iflags; |
| Sg_fd *sfp; |
| Sg_fd *tsfp; |
| Sg_request *srp; |
| Sg_request *tsrp; |
| int delay; |
| |
| if (!sdp) |
| return; |
| |
| delay = 0; |
| write_lock_irqsave(&sg_index_lock, iflags); |
| 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_remove: dev=%d, dirty\n", sdp->index)); |
| if (NULL == sdp->headfp) { |
| idr_remove(&sg_index_idr, sdp->index); |
| } |
| } else { /* nothing active, simple case */ |
| SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index)); |
| idr_remove(&sg_index_idr, sdp->index); |
| } |
| write_unlock_irqrestore(&sg_index_lock, iflags); |
| |
| sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); |
| device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); |
| cdev_del(sdp->cdev); |
| sdp->cdev = NULL; |
| put_disk(sdp->disk); |
| sdp->disk = NULL; |
| if (NULL == sdp->headfp) |
| kfree(sdp); |
| |
| if (delay) |
| msleep(10); /* dirty detach so delay device destruction */ |
| } |
| |
| module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); |
| module_param_named(def_reserved_size, def_reserved_size, int, |
| S_IRUGO | S_IWUSR); |
| 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_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |
| |
| MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " |
| "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); |
| 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 (scatter_elem_sz < PAGE_SIZE) { |
| scatter_elem_sz = PAGE_SIZE; |
| scatter_elem_sz_prev = scatter_elem_sz; |
| } |
| if (def_reserved_size >= 0) |
| sg_big_buff = def_reserved_size; |
| else |
| def_reserved_size = sg_big_buff; |
| |
| rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), |
| SG_MAX_DEVS, "sg"); |
| if (rc) |
| return rc; |
| sg_sysfs_class = class_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_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_destroy(sg_sysfs_class); |
| sg_sysfs_valid = 0; |
| unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), |
| SG_MAX_DEVS); |
| idr_destroy(&sg_index_idr); |
| } |
| |
| 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 sg_bufflen = tablesize * sizeof(struct scatterlist); |
| gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; |
| |
| /* |
| * TODO: test without low_dma, we should not need it since |
| * the block layer will bounce the buffer for us |
| * |
| * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. |
| */ |
| if (sfp->low_dma) |
| gfp_flags |= GFP_DMA; |
| schp->buffer = kzalloc(sg_bufflen, gfp_flags); |
| if (!schp->buffer) |
| return -ENOMEM; |
| sg_init_table(schp->buffer, tablesize); |
| schp->sglist_len = sg_bufflen; |
| return tablesize; /* number of scat_gath elements allocated */ |
| } |
| |
| #ifdef SG_ALLOW_DIO_CODE |
| /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ |
| /* TODO: hopefully we can use the generic block layer code */ |
| |
| /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if |
| - mapping of all pages not successful |
| (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 end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| unsigned long start = uaddr >> PAGE_SHIFT; |
| const int nr_pages = end - start; |
| int res, i, j; |
| struct page **pages; |
| |
| /* 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]); |
| /* ?? Is locking needed? I don't think so */ |
| /* if (TestSetPageLocked(pages[i])) |
| goto out_unlock; */ |
| } |
| |
| sg_set_page(sgl, pages[0], 0, 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++) |
| sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0); |
| } |
| else { |
| sgl[0].length = count; |
| } |
| |
| kfree(pages); |
| return nr_pages; |
| |
| out_unmap: |
| if (res > 0) { |
| for (j=0; j < res; j++) |
| page_cache_release(pages[j]); |
| res = 0; |
| } |
| 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++) { |
| struct page *page = sg_page(&sgl[i]); |
| |
| if (dirtied) |
| SetPageDirty(page); |
| /* unlock_page(page); */ |
| /* FIXME: cache flush missing for rw==READ |
| * FIXME: call the correct reference counting function |
| */ |
| page_cache_release(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; |
| 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; |
| } |
| res = st_map_user_pages(schp->buffer, mx_sc_elems, |
| (unsigned long)hp->dxferp, dxfer_len, |
| (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); |
| if (res <= 0) { |
| sg_remove_scat(schp); |
| 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) |
| { |
| struct scatterlist *sg; |
| int ret_sz = 0, k, rem_sz, num, mx_sc_elems; |
| int sg_tablesize = sfp->parentdp->sg_tablesize; |
| int blk_size = buff_size; |
| struct page *p = NULL; |
| |
| if (blk_size < 0) |
| 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)); |
| |
| /* 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 */ |
| |
| num = scatter_elem_sz; |
| if (unlikely(num != scatter_elem_sz_prev)) { |
| if (num < PAGE_SIZE) { |
| scatter_elem_sz = PAGE_SIZE; |
| scatter_elem_sz_prev = PAGE_SIZE; |
| } else |
| scatter_elem_sz_prev = num; |
| } |
| for (k = 0, sg = schp->buffer, rem_sz = blk_size; |
| (rem_sz > 0) && (k < mx_sc_elems); |
| ++k, rem_sz -= ret_sz, sg = sg_next(sg)) { |
| |
| num = (rem_sz > scatter_elem_sz_prev) ? |
| scatter_elem_sz_prev : rem_sz; |
| p = sg_page_malloc(num, sfp->low_dma, &ret_sz); |
| if (!p) |
| return -ENOMEM; |
| |
| if (num == scatter_elem_sz_prev) { |
| if (unlikely(ret_sz > scatter_elem_sz_prev)) { |
| scatter_elem_sz = ret_sz; |
| scatter_elem_sz_prev = ret_sz; |
| } |
| } |
| sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0); |
| |
| SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " |
| "ret_sz=%d\n", k, num, 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; |
| struct scatterlist *sg = schp->buffer; |
| 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; |
| |
| ksglen = sg->length; |
| p = page_address(sg_page(sg)); |
| 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; sg = sg_next(sg), ksglen = sg->length, |
| p = page_address(sg_page(sg))) { |
| 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 *sg = schp->buffer; |
| |
| if (schp->dio_in_use) { |
| #ifdef SG_ALLOW_DIO_CODE |
| st_unmap_user_pages(sg, schp->k_use_sg, TRUE); |
| #endif |
| } else { |
| int k; |
| |
| for (k = 0; (k < schp->k_use_sg) && sg_page(sg); |
| ++k, sg = sg_next(sg)) { |
| SCSI_LOG_TIMEOUT(5, printk( |
| "sg_remove_scat: k=%d, pg=0x%p, len=%d\n", |
| k, sg_page(sg), sg->length)); |
| sg_page_free(sg_page(sg), sg->length); |
| } |
| } |
| kfree(schp->buffer); |
| } |
| 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; |
| struct scatterlist *sg = schp->buffer; |
| 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; |
| |
| p = page_address(sg_page(sg)); |
| ksglen = sg->length; |
| 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; sg = sg_next(sg), ksglen = sg->length, |
| p = page_address(sg_page(sg))) { |
| 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; |
| struct scatterlist *sg = schp->buffer; |
| int k, num; |
| |
| SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", |
| num_read_xfer)); |
| if ((!outp) || (num_read_xfer <= 0)) |
| return 0; |
| |
| for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) { |
| num = sg->length; |
| if (num > num_read_xfer) { |
| if (__copy_to_user(outp, page_address(sg_page(sg)), |
| num_read_xfer)) |
| return -EFAULT; |
| break; |
| } else { |
| if (__copy_to_user(outp, page_address(sg_page(sg)), |
| num)) |
| return -EFAULT; |
| num_read_xfer -= num; |
| if (num_read_xfer <= 0) |
| break; |
| outp += num; |
| } |
| } |
| |
| 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; |
| struct scatterlist *sg = rsv_schp->buffer; |
| int k, num, rem; |
| |
| srp->res_used = 1; |
| SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); |
| rem = size; |
| |
| for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) { |
| num = sg->length; |
| if (rem <= num) { |
| sfp->save_scat_len = num; |
| sg->length = 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")); |
| } |
| |
| 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 *sg = rsv_schp->buffer; |
| |
| if (sfp->save_scat_len > 0) |
| (sg + (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_to_msecs(jiffies); |
| } |
| 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_index_lock, iflags); |
| for (k = 0, resp = sdp->headfp; resp && (k < nth); |
| ++k, resp = resp->nextfp) ; |
| read_unlock_irqrestore(&sg_index_lock, iflags); |
| return resp; |
| } |
| #endif |
| |
| static Sg_fd * |
| sg_add_sfp(Sg_device * sdp, int dev) |
| { |
| Sg_fd *sfp; |
| unsigned long iflags; |
| int bufflen; |
| |
| sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
| if (!sfp) |
| return NULL; |
| |
| 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_index_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_index_lock, iflags); |
| SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); |
| if (unlikely(sg_big_buff != def_reserved_size)) |
| sg_big_buff = def_reserved_size; |
| |
| bufflen = min_t(int, sg_big_buff, |
| sdp->device->request_queue->max_sectors * 512); |
| sg_build_reserve(sfp, bufflen); |
| 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)); |
| sg_remove_scat(&sfp->reserve); |
| } |
| sfp->parentdp = NULL; |
| SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); |
| kfree(sfp); |
| } |
| |
| /* 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_index_lock, iflags); |
| __sg_remove_sfp(sdp, sfp); |
| if (sdp->detached && (NULL == sdp->headfp)) { |
| idr_remove(&sg_index_idr, sdp->index); |
| kfree(sdp); |
| res = 1; |
| } |
| write_unlock_irqrestore(&sg_index_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; |
| } |
| |
| /* The size fetched (value output via retSzp) set when non-NULL return */ |
| static struct page * |
| sg_page_malloc(int rqSz, int lowDma, int *retSzp) |
| { |
| struct page *resp = NULL; |
| gfp_t page_mask; |
| int order, a_size; |
| int resSz; |
| |
| if ((rqSz <= 0) || (NULL == retSzp)) |
| return resp; |
| |
| if (lowDma) |
| page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; |
| else |
| page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; |
| |
| for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; |
| order++, a_size <<= 1) ; |
| resSz = a_size; /* rounded up if necessary */ |
| resp = alloc_pages(page_mask, order); |
| while ((!resp) && order) { |
| --order; |
| a_size >>= 1; /* divide by 2, until PAGE_SIZE */ |
| resp = alloc_pages(page_mask, order); /* try half */ |
| resSz = a_size; |
| } |
| if (resp) { |
| if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| memset(page_address(resp), 0, resSz); |
| *retSzp = resSz; |
| } |
| return resp; |
| } |
| |
| static void |
| sg_page_free(struct page *page, int size) |
| { |
| int order, a_size; |
| |
| if (!page) |
| return; |
| for (order = 0, a_size = PAGE_SIZE; a_size < size; |
| order++, a_size <<= 1) ; |
| __free_pages(page, order); |
| } |
| |
| #ifdef CONFIG_SCSI_PROC_FS |
| static int |
| sg_idr_max_id(int id, void *p, void *data) |
| { |
| int *k = data; |
| |
| if (*k < id) |
| *k = id; |
| |
| return 0; |
| } |
| |
| static int |
| sg_last_dev(void) |
| { |
| int k = -1; |
| unsigned long iflags; |
| |
| read_lock_irqsave(&sg_index_lock, iflags); |
| idr_for_each(&sg_index_idr, sg_idr_max_id, &k); |
| read_unlock_irqrestore(&sg_index_lock, iflags); |
| return k + 1; /* origin 1 */ |
| } |
| #endif |
| |
| static Sg_device * |
| sg_get_dev(int dev) |
| { |
| Sg_device *sdp; |
| unsigned long iflags; |
| |
| read_lock_irqsave(&sg_index_lock, iflags); |
| sdp = idr_find(&sg_index_idr, dev); |
| read_unlock_irqrestore(&sg_index_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 = ARRAY_SIZE(sg_proc_leaf_arr); |
| struct sg_proc_leaf * leaf; |
| |
| sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, 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; |
| leaf->fops->owner = THIS_MODULE; |
| leaf->fops->read = seq_read; |
| leaf->fops->llseek = seq_lseek; |
| proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); |
| } |
| return 0; |
| } |
| |
| static void |
| sg_proc_cleanup(void) |
| { |
| int k; |
| int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
| |
| 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); |
| |
| s->private = it; |
| if (! it) |
| return NULL; |
| |
| it->index = *pos; |
| it->max = sg_last_dev(); |
| if (it->index >= it->max) |
| return NULL; |
| return it; |
| } |
| |
| static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| { |
| struct sg_proc_deviter * it = s->private; |
| |
| *pos = ++it->index; |
| return (it->index < it->max) ? it : NULL; |
| } |
| |
| static void dev_seq_stop(struct seq_file *s, void *v) |
| { |
| kfree(s->private); |
| } |
| |
| 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; |
| unsigned int ms; |
| |
| 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->data.bufflen; |
| usg = srp->data.k_use_sg; |
| seq_printf(s, srp->done ? |
| ((1 == srp->done) ? "rcv:" : "fin:") |
| : "act:"); |
| seq_printf(s, " id=%d blen=%d", |
| srp->header.pack_id, blen); |
| if (srp->done) |
| seq_printf(s, " dur=%d", hp->duration); |
| else { |
| ms = jiffies_to_msecs(jiffies); |
| seq_printf(s, " t_o/elap=%d/%d", |
| (new_interface ? hp->timeout : |
| jiffies_to_msecs(fp->timeout)), |
| (ms > hp->duration ? ms - 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, "max_active_device=%d(origin 1)\n", |
| (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); |