Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * History: |
| 3 | * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), |
| 4 | * to allow user process control of SCSI devices. |
| 5 | * Development Sponsored by Killy Corp. NY NY |
| 6 | * |
| 7 | * Original driver (sg.c): |
| 8 | * Copyright (C) 1992 Lawrence Foard |
| 9 | * Version 2 and 3 extensions to driver: |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 10 | * Copyright (C) 1998 - 2014 Douglas Gilbert |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2, or (at your option) |
| 15 | * any later version. |
| 16 | * |
| 17 | */ |
| 18 | |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 19 | static int sg_version_num = 30536; /* 2 digits for each component */ |
| 20 | #define SG_VERSION_STR "3.5.36" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | /* |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 23 | * D. P. Gilbert (dgilbert@interlog.com), notes: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First |
| 25 | * the kernel/module needs to be built with CONFIG_SCSI_LOGGING |
| 26 | * (otherwise the macros compile to empty statements). |
| 27 | * |
| 28 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/module.h> |
| 30 | |
| 31 | #include <linux/fs.h> |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/sched.h> |
| 34 | #include <linux/string.h> |
| 35 | #include <linux/mm.h> |
| 36 | #include <linux/errno.h> |
| 37 | #include <linux/mtio.h> |
| 38 | #include <linux/ioctl.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 39 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/fcntl.h> |
| 41 | #include <linux/init.h> |
| 42 | #include <linux/poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/moduleparam.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/cdev.h> |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 45 | #include <linux/idr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/seq_file.h> |
| 47 | #include <linux/blkdev.h> |
| 48 | #include <linux/delay.h> |
Christof Schmitt | 6da127a | 2008-01-11 10:09:43 +0100 | [diff] [blame] | 49 | #include <linux/blktrace_api.h> |
Arnd Bergmann | c45d15d | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 50 | #include <linux/mutex.h> |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 51 | #include <linux/atomic.h> |
Christian Dietrich | 2fe038e | 2011-06-04 17:36:10 +0200 | [diff] [blame] | 52 | #include <linux/ratelimit.h> |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 53 | #include <linux/uio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | #include "scsi.h" |
| db9dff3 | 2005-04-03 14:53:59 -0500 | [diff] [blame] | 56 | #include <scsi/scsi_dbg.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #include <scsi/scsi_host.h> |
| 58 | #include <scsi/scsi_driver.h> |
| 59 | #include <scsi/scsi_ioctl.h> |
| 60 | #include <scsi/sg.h> |
| 61 | |
| 62 | #include "scsi_logging.h" |
| 63 | |
| 64 | #ifdef CONFIG_SCSI_PROC_FS |
| 65 | #include <linux/proc_fs.h> |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 66 | static char *sg_version_date = "20140603"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | static int sg_proc_init(void); |
| 69 | static void sg_proc_cleanup(void); |
| 70 | #endif |
| 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #define SG_ALLOW_DIO_DEF 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | #define SG_MAX_DEVS 32768 |
| 75 | |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 76 | /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type |
| 77 | * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater |
| 78 | * than 16 bytes are "variable length" whose length is a multiple of 4 |
| 79 | */ |
| 80 | #define SG_MAX_CDB_SIZE 252 |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | /* |
| 83 | * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) |
| 84 | * Then when using 32 bit integers x * m may overflow during the calculation. |
| 85 | * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m |
| 86 | * calculates the same, but prevents the overflow when both m and d |
| 87 | * are "small" numbers (like HZ and USER_HZ). |
| 88 | * Of course an overflow is inavoidable if the result of muldiv doesn't fit |
| 89 | * in 32 bits. |
| 90 | */ |
| 91 | #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) |
| 92 | |
| 93 | #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) |
| 94 | |
| 95 | int sg_big_buff = SG_DEF_RESERVED_SIZE; |
| 96 | /* N.B. This variable is readable and writeable via |
| 97 | /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer |
| 98 | of this size (or less if there is not enough memory) will be reserved |
| 99 | for use by this file descriptor. [Deprecated usage: this variable is also |
| 100 | readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into |
| 101 | the kernel (i.e. it is not a module).] */ |
| 102 | static int def_reserved_size = -1; /* picks up init parameter */ |
| 103 | static int sg_allow_dio = SG_ALLOW_DIO_DEF; |
| 104 | |
Douglas Gilbert | 6460e75 | 2006-09-20 18:20:49 -0400 | [diff] [blame] | 105 | static int scatter_elem_sz = SG_SCATTER_SZ; |
| 106 | static int scatter_elem_sz_prev = SG_SCATTER_SZ; |
| 107 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | #define SG_SECTOR_SZ 512 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 110 | static int sg_add_device(struct device *, struct class_interface *); |
| 111 | static void sg_remove_device(struct device *, struct class_interface *); |
James Bottomley | 98481ff | 2013-10-25 10:26:38 +0100 | [diff] [blame] | 112 | |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 113 | static DEFINE_IDR(sg_index_idr); |
James Bottomley | c0d3b9c | 2013-10-25 10:21:57 +0100 | [diff] [blame] | 114 | static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock |
| 115 | file descriptor list for device */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
| 117 | static struct class_interface sg_interface = { |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 118 | .add_dev = sg_add_device, |
| 119 | .remove_dev = sg_remove_device, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | }; |
| 121 | |
| 122 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ |
| 123 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ |
FUJITA Tomonori | ea31255 | 2007-08-06 00:31:24 +0900 | [diff] [blame] | 124 | unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | unsigned bufflen; /* Size of (aggregate) data buffer */ |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 126 | struct page **pages; |
| 127 | int page_order; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ |
| 129 | unsigned char cmd_opcode; /* first byte of command */ |
| 130 | } Sg_scatter_hold; |
| 131 | |
| 132 | struct sg_device; /* forward declarations */ |
| 133 | struct sg_fd; |
| 134 | |
| 135 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | struct sg_request *nextrp; /* NULL -> tail request (slist) */ |
| 137 | struct sg_fd *parentfp; /* NULL -> not in use */ |
| 138 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ |
| 139 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 140 | unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ |
| 142 | char orphan; /* 1 -> drop on sight, 0 -> normal */ |
| 143 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ |
Jörn Engel | 6acddc5 | 2012-04-12 17:33:58 -0400 | [diff] [blame] | 144 | /* done protected by rq_list_lock */ |
| 145 | char done; /* 0->before bh, 1->before read, 2->read */ |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 146 | struct request *rq; |
FUJITA Tomonori | 6e5a30c | 2008-08-28 16:17:08 +0900 | [diff] [blame] | 147 | struct bio *bio; |
FUJITA Tomonori | c96952e | 2009-02-04 11:36:27 +0900 | [diff] [blame] | 148 | struct execute_work ew; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } Sg_request; |
| 150 | |
| 151 | typedef struct sg_fd { /* holds the state of a file descriptor */ |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 152 | struct list_head sfd_siblings; /* protected by device's sfd_lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | struct sg_device *parentdp; /* owning device */ |
| 154 | wait_queue_head_t read_wait; /* queue read until command done */ |
| 155 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ |
| 156 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ |
| 157 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ |
| 158 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ |
| 159 | unsigned save_scat_len; /* original length of trunc. scat. element */ |
| 160 | Sg_request *headrp; /* head of request slist, NULL->empty */ |
| 161 | struct fasync_struct *async_qp; /* used by asynchronous notification */ |
| 162 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ |
| 163 | char low_dma; /* as in parent but possibly overridden to 1 */ |
| 164 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 166 | unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ |
| 168 | char mmap_called; /* 0 -> mmap() never called on this fd */ |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 169 | struct kref f_ref; |
| 170 | struct execute_work ew; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } Sg_fd; |
| 172 | |
| 173 | typedef struct sg_device { /* holds the state of each scsi generic device */ |
| 174 | struct scsi_device *device; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 175 | wait_queue_head_t open_wait; /* queue open() when O_EXCL present */ |
| 176 | struct mutex open_rel_lock; /* held when in open() or release() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | int sg_tablesize; /* adapter's max scatter-gather table size */ |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 178 | u32 index; /* device index number */ |
FUJITA Tomonori | 3442f80 | 2009-02-16 13:26:53 +0900 | [diff] [blame] | 179 | struct list_head sfds; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 180 | rwlock_t sfd_lock; /* protect access to sfd list */ |
| 181 | atomic_t detaching; /* 0->device usable, 1->device detaching */ |
| 182 | bool exclude; /* 1->open(O_EXCL) succeeded and is active */ |
| 183 | int open_cnt; /* count of opens (perhaps < num(sfds) ) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ |
| 185 | struct gendisk *disk; |
| 186 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 187 | struct kref d_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | } Sg_device; |
| 189 | |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 190 | /* tasklet or soft irq callback */ |
FUJITA Tomonori | a91a3a2 | 2008-09-02 22:50:01 +0900 | [diff] [blame] | 191 | static void sg_rq_end_io(struct request *rq, int uptodate); |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 192 | static int sg_start_req(Sg_request *srp, unsigned char *cmd); |
FUJITA Tomonori | e7ee4cc | 2009-04-04 00:35:42 +0900 | [diff] [blame] | 193 | static int sg_finish_rem_req(Sg_request * srp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, |
| 196 | Sg_request * srp); |
Adel Gadllah | 0b07de8 | 2008-06-26 13:48:27 +0200 | [diff] [blame] | 197 | static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, |
| 198 | const char __user *buf, size_t count, int blocking, |
Tony Battersby | a2dd3b4 | 2009-01-20 17:00:09 -0500 | [diff] [blame] | 199 | int read_only, int sg_io_owned, Sg_request **o_srp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | static int sg_common_write(Sg_fd * sfp, Sg_request * srp, |
| 201 | unsigned char *cmnd, int timeout, int blocking); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 203 | static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | static void sg_build_reserve(Sg_fd * sfp, int req_size); |
| 205 | static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); |
| 206 | static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 207 | static Sg_fd *sg_add_sfp(Sg_device * sdp); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 208 | static void sg_remove_sfp(struct kref *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); |
| 210 | static Sg_request *sg_add_request(Sg_fd * sfp); |
| 211 | static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); |
| 212 | static int sg_res_in_use(Sg_fd * sfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | static Sg_device *sg_get_dev(int dev); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 214 | static void sg_device_destroy(struct kref *kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | #define SZ_SG_HEADER sizeof(struct sg_header) |
| 217 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) |
| 218 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) |
| 219 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) |
| 220 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 221 | #define sg_printk(prefix, sdp, fmt, a...) \ |
Hannes Reinecke | 22e0d99 | 2014-10-24 14:26:44 +0200 | [diff] [blame] | 222 | sdev_prefix_printk(prefix, (sdp)->device, \ |
| 223 | (sdp)->disk->disk_name, fmt, ##a) |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 224 | |
FUJITA Tomonori | 14e507b | 2008-07-26 18:03:24 +0900 | [diff] [blame] | 225 | static int sg_allow_access(struct file *filp, unsigned char *cmd) |
| 226 | { |
Joe Perches | 35df839 | 2010-09-04 18:52:46 -0700 | [diff] [blame] | 227 | struct sg_fd *sfp = filp->private_data; |
FUJITA Tomonori | 14e507b | 2008-07-26 18:03:24 +0900 | [diff] [blame] | 228 | |
| 229 | if (sfp->parentdp->device->type == TYPE_SCANNER) |
| 230 | return 0; |
| 231 | |
Jens Axboe | 018e044 | 2009-06-26 16:27:10 +0200 | [diff] [blame] | 232 | return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); |
FUJITA Tomonori | 14e507b | 2008-07-26 18:03:24 +0900 | [diff] [blame] | 233 | } |
| 234 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 235 | static int |
| 236 | open_wait(Sg_device *sdp, int flags) |
James Bottomley | 98481ff | 2013-10-25 10:26:38 +0100 | [diff] [blame] | 237 | { |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 238 | int retval = 0; |
James Bottomley | 98481ff | 2013-10-25 10:26:38 +0100 | [diff] [blame] | 239 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 240 | if (flags & O_EXCL) { |
| 241 | while (sdp->open_cnt > 0) { |
| 242 | mutex_unlock(&sdp->open_rel_lock); |
| 243 | retval = wait_event_interruptible(sdp->open_wait, |
| 244 | (atomic_read(&sdp->detaching) || |
| 245 | !sdp->open_cnt)); |
| 246 | mutex_lock(&sdp->open_rel_lock); |
| 247 | |
| 248 | if (retval) /* -ERESTARTSYS */ |
| 249 | return retval; |
| 250 | if (atomic_read(&sdp->detaching)) |
| 251 | return -ENODEV; |
| 252 | } |
| 253 | } else { |
| 254 | while (sdp->exclude) { |
| 255 | mutex_unlock(&sdp->open_rel_lock); |
| 256 | retval = wait_event_interruptible(sdp->open_wait, |
| 257 | (atomic_read(&sdp->detaching) || |
| 258 | !sdp->exclude)); |
| 259 | mutex_lock(&sdp->open_rel_lock); |
| 260 | |
| 261 | if (retval) /* -ERESTARTSYS */ |
| 262 | return retval; |
| 263 | if (atomic_read(&sdp->detaching)) |
| 264 | return -ENODEV; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | return retval; |
James Bottomley | 98481ff | 2013-10-25 10:26:38 +0100 | [diff] [blame] | 269 | } |
| 270 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 271 | /* Returns 0 on success, else a negated errno value */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | static int |
| 273 | sg_open(struct inode *inode, struct file *filp) |
| 274 | { |
| 275 | int dev = iminor(inode); |
| 276 | int flags = filp->f_flags; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 277 | struct request_queue *q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | Sg_device *sdp; |
| 279 | Sg_fd *sfp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | int retval; |
| 281 | |
| 282 | nonseekable_open(inode, filp); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 283 | if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) |
| 284 | return -EPERM; /* Can't lock it with read only access */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | sdp = sg_get_dev(dev); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 286 | if (IS_ERR(sdp)) |
| 287 | return PTR_ERR(sdp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 289 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 290 | "sg_open: flags=0x%x\n", flags)); |
| 291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ |
| 293 | /* Prevent the device driver from vanishing while we sleep */ |
| 294 | retval = scsi_device_get(sdp->device); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 295 | if (retval) |
| 296 | goto sg_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 298 | retval = scsi_autopm_get_device(sdp->device); |
| 299 | if (retval) |
| 300 | goto sdp_put; |
| 301 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 302 | /* scsi_block_when_processing_errors() may block so bypass |
| 303 | * check if O_NONBLOCK. Permits SCSI commands to be issued |
| 304 | * during error recovery. Tread carefully. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | if (!((flags & O_NONBLOCK) || |
| 306 | scsi_block_when_processing_errors(sdp->device))) { |
| 307 | retval = -ENXIO; |
| 308 | /* we are in error recovery for this device */ |
| 309 | goto error_out; |
| 310 | } |
| 311 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 312 | mutex_lock(&sdp->open_rel_lock); |
| 313 | if (flags & O_NONBLOCK) { |
| 314 | if (flags & O_EXCL) { |
| 315 | if (sdp->open_cnt > 0) { |
| 316 | retval = -EBUSY; |
| 317 | goto error_mutex_locked; |
| 318 | } |
| 319 | } else { |
| 320 | if (sdp->exclude) { |
| 321 | retval = -EBUSY; |
| 322 | goto error_mutex_locked; |
| 323 | } |
Vaughan Cao | 15b06f9 | 2013-08-29 10:00:36 +0800 | [diff] [blame] | 324 | } |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 325 | } else { |
| 326 | retval = open_wait(sdp, flags); |
| 327 | if (retval) /* -ERESTARTSYS or -ENODEV */ |
| 328 | goto error_mutex_locked; |
Vaughan Cao | 15b06f9 | 2013-08-29 10:00:36 +0800 | [diff] [blame] | 329 | } |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 330 | |
| 331 | /* N.B. at this point we are holding the open_rel_lock */ |
| 332 | if (flags & O_EXCL) |
| 333 | sdp->exclude = true; |
| 334 | |
| 335 | if (sdp->open_cnt < 1) { /* no existing opens */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | sdp->sgdebug = 0; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 337 | q = sdp->device->request_queue; |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 338 | sdp->sg_tablesize = queue_max_segments(q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | } |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 340 | sfp = sg_add_sfp(sdp); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 341 | if (IS_ERR(sfp)) { |
| 342 | retval = PTR_ERR(sfp); |
| 343 | goto out_undo; |
James Bottomley | 065b4a2 | 2013-10-25 10:27:02 +0100 | [diff] [blame] | 344 | } |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 345 | |
| 346 | filp->private_data = sfp; |
| 347 | sdp->open_cnt++; |
| 348 | mutex_unlock(&sdp->open_rel_lock); |
| 349 | |
James Bottomley | 065b4a2 | 2013-10-25 10:27:02 +0100 | [diff] [blame] | 350 | retval = 0; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 351 | sg_put: |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 352 | kref_put(&sdp->d_ref, sg_device_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | return retval; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 354 | |
| 355 | out_undo: |
| 356 | if (flags & O_EXCL) { |
| 357 | sdp->exclude = false; /* undo if error */ |
| 358 | wake_up_interruptible(&sdp->open_wait); |
| 359 | } |
| 360 | error_mutex_locked: |
| 361 | mutex_unlock(&sdp->open_rel_lock); |
| 362 | error_out: |
| 363 | scsi_autopm_put_device(sdp->device); |
| 364 | sdp_put: |
| 365 | scsi_device_put(sdp->device); |
| 366 | goto sg_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | } |
| 368 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 369 | /* Release resources associated with a successful sg_open() |
| 370 | * Returns 0 on success, else a negated errno value */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | static int |
| 372 | sg_release(struct inode *inode, struct file *filp) |
| 373 | { |
| 374 | Sg_device *sdp; |
| 375 | Sg_fd *sfp; |
| 376 | |
| 377 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 378 | return -ENXIO; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 379 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n")); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 380 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 381 | mutex_lock(&sdp->open_rel_lock); |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 382 | scsi_autopm_put_device(sdp->device); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 383 | kref_put(&sfp->f_ref, sg_remove_sfp); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 384 | sdp->open_cnt--; |
| 385 | |
| 386 | /* possibly many open()s waiting on exlude clearing, start many; |
| 387 | * only open(O_EXCL)s wait on 0==open_cnt so only start one */ |
| 388 | if (sdp->exclude) { |
| 389 | sdp->exclude = false; |
| 390 | wake_up_interruptible_all(&sdp->open_wait); |
| 391 | } else if (0 == sdp->open_cnt) { |
| 392 | wake_up_interruptible(&sdp->open_wait); |
| 393 | } |
| 394 | mutex_unlock(&sdp->open_rel_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | return 0; |
| 396 | } |
| 397 | |
| 398 | static ssize_t |
| 399 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) |
| 400 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | Sg_device *sdp; |
| 402 | Sg_fd *sfp; |
| 403 | Sg_request *srp; |
| 404 | int req_pack_id = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | sg_io_hdr_t *hp; |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 406 | struct sg_header *old_hdr = NULL; |
| 407 | int retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
| 409 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 410 | return -ENXIO; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 411 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 412 | "sg_read: count=%d\n", (int) count)); |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 413 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | if (!access_ok(VERIFY_WRITE, buf, count)) |
| 415 | return -EFAULT; |
| 416 | if (sfp->force_packid && (count >= SZ_SG_HEADER)) { |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 417 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
| 418 | if (!old_hdr) |
| 419 | return -ENOMEM; |
| 420 | if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { |
| 421 | retval = -EFAULT; |
| 422 | goto free_old_hdr; |
| 423 | } |
| 424 | if (old_hdr->reply_len < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | if (count >= SZ_SG_IO_HDR) { |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 426 | sg_io_hdr_t *new_hdr; |
| 427 | new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); |
| 428 | if (!new_hdr) { |
| 429 | retval = -ENOMEM; |
| 430 | goto free_old_hdr; |
| 431 | } |
| 432 | retval =__copy_from_user |
| 433 | (new_hdr, buf, SZ_SG_IO_HDR); |
| 434 | req_pack_id = new_hdr->pack_id; |
| 435 | kfree(new_hdr); |
| 436 | if (retval) { |
| 437 | retval = -EFAULT; |
| 438 | goto free_old_hdr; |
| 439 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | } |
| 441 | } else |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 442 | req_pack_id = old_hdr->pack_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
| 444 | srp = sg_get_rq_mark(sfp, req_pack_id); |
| 445 | if (!srp) { /* now wait on packet to arrive */ |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 446 | if (atomic_read(&sdp->detaching)) { |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 447 | retval = -ENODEV; |
| 448 | goto free_old_hdr; |
| 449 | } |
| 450 | if (filp->f_flags & O_NONBLOCK) { |
| 451 | retval = -EAGAIN; |
| 452 | goto free_old_hdr; |
| 453 | } |
Jörn Engel | 3f0c6ab | 2012-04-12 17:33:25 -0400 | [diff] [blame] | 454 | retval = wait_event_interruptible(sfp->read_wait, |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 455 | (atomic_read(&sdp->detaching) || |
Jörn Engel | 3f0c6ab | 2012-04-12 17:33:25 -0400 | [diff] [blame] | 456 | (srp = sg_get_rq_mark(sfp, req_pack_id)))); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 457 | if (atomic_read(&sdp->detaching)) { |
Jörn Engel | 794c10f | 2012-04-12 17:32:48 -0400 | [diff] [blame] | 458 | retval = -ENODEV; |
| 459 | goto free_old_hdr; |
| 460 | } |
| 461 | if (retval) { |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 462 | /* -ERESTARTSYS as signal hit process */ |
| 463 | goto free_old_hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | } |
| 465 | } |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 466 | if (srp->header.interface_id != '\0') { |
| 467 | retval = sg_new_read(sfp, buf, count, srp); |
| 468 | goto free_old_hdr; |
| 469 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
| 471 | hp = &srp->header; |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 472 | if (old_hdr == NULL) { |
| 473 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
| 474 | if (! old_hdr) { |
| 475 | retval = -ENOMEM; |
| 476 | goto free_old_hdr; |
| 477 | } |
| 478 | } |
| 479 | memset(old_hdr, 0, SZ_SG_HEADER); |
| 480 | old_hdr->reply_len = (int) hp->timeout; |
| 481 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ |
| 482 | old_hdr->pack_id = hp->pack_id; |
| 483 | old_hdr->twelve_byte = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 485 | old_hdr->target_status = hp->masked_status; |
| 486 | old_hdr->host_status = hp->host_status; |
| 487 | old_hdr->driver_status = hp->driver_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | if ((CHECK_CONDITION & hp->masked_status) || |
| 489 | (DRIVER_SENSE & hp->driver_status)) |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 490 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
| 491 | sizeof (old_hdr->sense_buffer)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | switch (hp->host_status) { |
| 493 | /* This setup of 'result' is for backward compatibility and is best |
| 494 | ignored by the user who should use target, host + driver status */ |
| 495 | case DID_OK: |
| 496 | case DID_PASSTHROUGH: |
| 497 | case DID_SOFT_ERROR: |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 498 | old_hdr->result = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | break; |
| 500 | case DID_NO_CONNECT: |
| 501 | case DID_BUS_BUSY: |
| 502 | case DID_TIME_OUT: |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 503 | old_hdr->result = EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | break; |
| 505 | case DID_BAD_TARGET: |
| 506 | case DID_ABORT: |
| 507 | case DID_PARITY: |
| 508 | case DID_RESET: |
| 509 | case DID_BAD_INTR: |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 510 | old_hdr->result = EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | break; |
| 512 | case DID_ERROR: |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 513 | old_hdr->result = (srp->sense_b[0] == 0 && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | hp->masked_status == GOOD) ? 0 : EIO; |
| 515 | break; |
| 516 | default: |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 517 | old_hdr->result = EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | break; |
| 519 | } |
| 520 | |
| 521 | /* Now copy the result back to the user buffer. */ |
| 522 | if (count >= SZ_SG_HEADER) { |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 523 | if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
| 524 | retval = -EFAULT; |
| 525 | goto free_old_hdr; |
| 526 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | buf += SZ_SG_HEADER; |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 528 | if (count > old_hdr->reply_len) |
| 529 | count = old_hdr->reply_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | if (count > SZ_SG_HEADER) { |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 531 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
| 532 | retval = -EFAULT; |
| 533 | goto free_old_hdr; |
| 534 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } |
| 536 | } else |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 537 | count = (old_hdr->result == 0) ? 0 : -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | sg_finish_rem_req(srp); |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 539 | retval = count; |
| 540 | free_old_hdr: |
Jesper Juhl | c9475cb | 2005-11-07 01:01:26 -0800 | [diff] [blame] | 541 | kfree(old_hdr); |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 542 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | } |
| 544 | |
| 545 | static ssize_t |
| 546 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) |
| 547 | { |
| 548 | sg_io_hdr_t *hp = &srp->header; |
Tony Battersby | 3b524a6 | 2015-02-11 11:32:06 -0500 | [diff] [blame] | 549 | int err = 0, err2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | int len; |
| 551 | |
| 552 | if (count < SZ_SG_IO_HDR) { |
| 553 | err = -EINVAL; |
| 554 | goto err_out; |
| 555 | } |
| 556 | hp->sb_len_wr = 0; |
| 557 | if ((hp->mx_sb_len > 0) && hp->sbp) { |
| 558 | if ((CHECK_CONDITION & hp->masked_status) || |
| 559 | (DRIVER_SENSE & hp->driver_status)) { |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 560 | int sb_len = SCSI_SENSE_BUFFERSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; |
| 562 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ |
| 563 | len = (len > sb_len) ? sb_len : len; |
| 564 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { |
| 565 | err = -EFAULT; |
| 566 | goto err_out; |
| 567 | } |
| 568 | hp->sb_len_wr = len; |
| 569 | } |
| 570 | } |
| 571 | if (hp->masked_status || hp->host_status || hp->driver_status) |
| 572 | hp->info |= SG_INFO_CHECK; |
| 573 | if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { |
| 574 | err = -EFAULT; |
| 575 | goto err_out; |
| 576 | } |
FUJITA Tomonori | 0b6cb26 | 2008-09-02 22:50:07 +0900 | [diff] [blame] | 577 | err_out: |
Tony Battersby | 3b524a6 | 2015-02-11 11:32:06 -0500 | [diff] [blame] | 578 | err2 = sg_finish_rem_req(srp); |
| 579 | return err ? : err2 ? : count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | static ssize_t |
| 583 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) |
| 584 | { |
| 585 | int mxsize, cmd_size, k; |
| 586 | int input_size, blocking; |
| 587 | unsigned char opcode; |
| 588 | Sg_device *sdp; |
| 589 | Sg_fd *sfp; |
| 590 | Sg_request *srp; |
| 591 | struct sg_header old_hdr; |
| 592 | sg_io_hdr_t *hp; |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 593 | unsigned char cmnd[SG_MAX_CDB_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
| 595 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 596 | return -ENXIO; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 597 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 598 | "sg_write: count=%d\n", (int) count)); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 599 | if (atomic_read(&sdp->detaching)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | return -ENODEV; |
| 601 | if (!((filp->f_flags & O_NONBLOCK) || |
| 602 | scsi_block_when_processing_errors(sdp->device))) |
| 603 | return -ENXIO; |
| 604 | |
| 605 | if (!access_ok(VERIFY_READ, buf, count)) |
| 606 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ |
| 607 | if (count < SZ_SG_HEADER) |
| 608 | return -EIO; |
| 609 | if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) |
| 610 | return -EFAULT; |
| 611 | blocking = !(filp->f_flags & O_NONBLOCK); |
| 612 | if (old_hdr.reply_len < 0) |
Tony Battersby | a2dd3b4 | 2009-01-20 17:00:09 -0500 | [diff] [blame] | 613 | return sg_new_write(sfp, filp, buf, count, |
| 614 | blocking, 0, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | if (count < (SZ_SG_HEADER + 6)) |
| 616 | return -EIO; /* The minimum scsi command length is 6 bytes. */ |
| 617 | |
| 618 | if (!(srp = sg_add_request(sfp))) { |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 619 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp, |
| 620 | "sg_write: queue full\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | return -EDOM; |
| 622 | } |
| 623 | buf += SZ_SG_HEADER; |
| 624 | __get_user(opcode, buf); |
| 625 | if (sfp->next_cmd_len > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | cmd_size = sfp->next_cmd_len; |
| 627 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ |
| 628 | } else { |
| 629 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ |
| 630 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) |
| 631 | cmd_size = 12; |
| 632 | } |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 633 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); |
| 635 | /* Determine buffer size. */ |
| 636 | input_size = count - cmd_size; |
| 637 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; |
| 638 | mxsize -= SZ_SG_HEADER; |
| 639 | input_size -= SZ_SG_HEADER; |
| 640 | if (input_size < 0) { |
| 641 | sg_remove_request(sfp, srp); |
| 642 | return -EIO; /* User did not pass enough bytes for this command. */ |
| 643 | } |
| 644 | hp = &srp->header; |
| 645 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ |
| 646 | hp->cmd_len = (unsigned char) cmd_size; |
| 647 | hp->iovec_count = 0; |
| 648 | hp->mx_sb_len = 0; |
| 649 | if (input_size > 0) |
| 650 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? |
| 651 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; |
| 652 | else |
| 653 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; |
| 654 | hp->dxfer_len = mxsize; |
FUJITA Tomonori | fad7f01 | 2008-09-02 16:20:20 +0900 | [diff] [blame] | 655 | if (hp->dxfer_direction == SG_DXFER_TO_DEV) |
| 656 | hp->dxferp = (char __user *)buf + cmd_size; |
| 657 | else |
| 658 | hp->dxferp = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | hp->sbp = NULL; |
| 660 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ |
| 661 | hp->flags = input_size; /* structure abuse ... */ |
| 662 | hp->pack_id = old_hdr.pack_id; |
| 663 | hp->usr_ptr = NULL; |
| 664 | if (__copy_from_user(cmnd, buf, cmd_size)) |
| 665 | return -EFAULT; |
| 666 | /* |
| 667 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, |
| 668 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there |
| 669 | * is a non-zero input_size, so emit a warning. |
| 670 | */ |
Andi Kleen | eaa3e22 | 2008-01-13 17:41:43 +0100 | [diff] [blame] | 671 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { |
| 672 | static char cmd[TASK_COMM_LEN]; |
Christian Dietrich | 2fe038e | 2011-06-04 17:36:10 +0200 | [diff] [blame] | 673 | if (strcmp(current->comm, cmd)) { |
| 674 | printk_ratelimited(KERN_WARNING |
| 675 | "sg_write: data in/out %d/%d bytes " |
| 676 | "for SCSI command 0x%x-- guessing " |
| 677 | "data in;\n program %s not setting " |
| 678 | "count and/or reply_len properly\n", |
| 679 | old_hdr.reply_len - (int)SZ_SG_HEADER, |
| 680 | input_size, (unsigned int) cmnd[0], |
| 681 | current->comm); |
Andi Kleen | eaa3e22 | 2008-01-13 17:41:43 +0100 | [diff] [blame] | 682 | strcpy(cmd, current->comm); |
| 683 | } |
| 684 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); |
| 686 | return (k < 0) ? k : count; |
| 687 | } |
| 688 | |
| 689 | static ssize_t |
Adel Gadllah | 0b07de8 | 2008-06-26 13:48:27 +0200 | [diff] [blame] | 690 | sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, |
Tony Battersby | a2dd3b4 | 2009-01-20 17:00:09 -0500 | [diff] [blame] | 691 | size_t count, int blocking, int read_only, int sg_io_owned, |
Adel Gadllah | 0b07de8 | 2008-06-26 13:48:27 +0200 | [diff] [blame] | 692 | Sg_request **o_srp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | { |
| 694 | int k; |
| 695 | Sg_request *srp; |
| 696 | sg_io_hdr_t *hp; |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 697 | unsigned char cmnd[SG_MAX_CDB_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | int timeout; |
| 699 | unsigned long ul_timeout; |
| 700 | |
| 701 | if (count < SZ_SG_IO_HDR) |
| 702 | return -EINVAL; |
| 703 | if (!access_ok(VERIFY_READ, buf, count)) |
| 704 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ |
| 705 | |
| 706 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ |
| 707 | if (!(srp = sg_add_request(sfp))) { |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 708 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
| 709 | "sg_new_write: queue full\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | return -EDOM; |
| 711 | } |
Tony Battersby | a2dd3b4 | 2009-01-20 17:00:09 -0500 | [diff] [blame] | 712 | srp->sg_io_owned = sg_io_owned; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | hp = &srp->header; |
| 714 | if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { |
| 715 | sg_remove_request(sfp, srp); |
| 716 | return -EFAULT; |
| 717 | } |
| 718 | if (hp->interface_id != 'S') { |
| 719 | sg_remove_request(sfp, srp); |
| 720 | return -ENOSYS; |
| 721 | } |
| 722 | if (hp->flags & SG_FLAG_MMAP_IO) { |
| 723 | if (hp->dxfer_len > sfp->reserve.bufflen) { |
| 724 | sg_remove_request(sfp, srp); |
| 725 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ |
| 726 | } |
| 727 | if (hp->flags & SG_FLAG_DIRECT_IO) { |
| 728 | sg_remove_request(sfp, srp); |
| 729 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ |
| 730 | } |
| 731 | if (sg_res_in_use(sfp)) { |
| 732 | sg_remove_request(sfp, srp); |
| 733 | return -EBUSY; /* reserve buffer already being used */ |
| 734 | } |
| 735 | } |
| 736 | ul_timeout = msecs_to_jiffies(srp->header.timeout); |
| 737 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; |
| 738 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { |
| 739 | sg_remove_request(sfp, srp); |
| 740 | return -EMSGSIZE; |
| 741 | } |
| 742 | if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { |
| 743 | sg_remove_request(sfp, srp); |
| 744 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ |
| 745 | } |
| 746 | if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { |
| 747 | sg_remove_request(sfp, srp); |
| 748 | return -EFAULT; |
| 749 | } |
FUJITA Tomonori | 14e507b | 2008-07-26 18:03:24 +0900 | [diff] [blame] | 750 | if (read_only && sg_allow_access(file, cmnd)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | sg_remove_request(sfp, srp); |
| 752 | return -EPERM; |
| 753 | } |
| 754 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); |
| 755 | if (k < 0) |
| 756 | return k; |
| 757 | if (o_srp) |
| 758 | *o_srp = srp; |
| 759 | return count; |
| 760 | } |
| 761 | |
| 762 | static int |
| 763 | sg_common_write(Sg_fd * sfp, Sg_request * srp, |
| 764 | unsigned char *cmnd, int timeout, int blocking) |
| 765 | { |
Bart Van Assche | 5af2e38 | 2015-01-30 16:22:38 +0100 | [diff] [blame] | 766 | int k, at_head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | Sg_device *sdp = sfp->parentdp; |
| 768 | sg_io_hdr_t *hp = &srp->header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
| 770 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ |
| 771 | hp->status = 0; |
| 772 | hp->masked_status = 0; |
| 773 | hp->msg_status = 0; |
| 774 | hp->info = 0; |
| 775 | hp->host_status = 0; |
| 776 | hp->driver_status = 0; |
| 777 | hp->resid = 0; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 778 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 779 | "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", |
| 780 | (int) cmnd[0], (int) hp->cmd_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 782 | k = sg_start_req(srp, cmnd); |
| 783 | if (k) { |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 784 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
| 785 | "sg_common_write: start_req err=%d\n", k)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | sg_finish_rem_req(srp); |
| 787 | return k; /* probably out of space --> ENOMEM */ |
| 788 | } |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 789 | if (atomic_read(&sdp->detaching)) { |
FUJITA Tomonori | caf19d3 | 2010-07-22 09:36:51 +0900 | [diff] [blame] | 790 | if (srp->bio) |
| 791 | blk_end_request_all(srp->rq, -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | sg_finish_rem_req(srp); |
| 793 | return -ENODEV; |
| 794 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 796 | hp->duration = jiffies_to_msecs(jiffies); |
Douglas Gilbert | 16070cc | 2014-06-04 10:58:30 -0400 | [diff] [blame] | 797 | if (hp->interface_id != '\0' && /* v3 (or later) interface */ |
| 798 | (SG_FLAG_Q_AT_TAIL & hp->flags)) |
| 799 | at_head = 0; |
| 800 | else |
| 801 | at_head = 1; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 802 | |
| 803 | srp->rq->timeout = timeout; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 804 | kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 805 | blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, |
Douglas Gilbert | 16070cc | 2014-06-04 10:58:30 -0400 | [diff] [blame] | 806 | srp->rq, at_head, sg_rq_end_io); |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 807 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | } |
| 809 | |
Jörn Engel | 6acddc5 | 2012-04-12 17:33:58 -0400 | [diff] [blame] | 810 | static int srp_done(Sg_fd *sfp, Sg_request *srp) |
| 811 | { |
| 812 | unsigned long flags; |
| 813 | int ret; |
| 814 | |
| 815 | read_lock_irqsave(&sfp->rq_list_lock, flags); |
| 816 | ret = srp->done; |
| 817 | read_unlock_irqrestore(&sfp->rq_list_lock, flags); |
| 818 | return ret; |
| 819 | } |
| 820 | |
Akinobu Mita | 46f69e6 | 2014-06-02 22:56:46 +0900 | [diff] [blame] | 821 | static int max_sectors_bytes(struct request_queue *q) |
| 822 | { |
| 823 | unsigned int max_sectors = queue_max_sectors(q); |
| 824 | |
| 825 | max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); |
| 826 | |
| 827 | return max_sectors << 9; |
| 828 | } |
| 829 | |
Jörn Engel | 37b9d1e | 2012-04-12 17:35:05 -0400 | [diff] [blame] | 830 | static long |
Arnd Bergmann | f4927c4 | 2010-04-27 00:24:01 +0200 | [diff] [blame] | 831 | sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | { |
| 833 | void __user *p = (void __user *)arg; |
| 834 | int __user *ip = p; |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 835 | int result, val, read_only; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | Sg_device *sdp; |
| 837 | Sg_fd *sfp; |
| 838 | Sg_request *srp; |
| 839 | unsigned long iflags; |
| 840 | |
| 841 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 842 | return -ENXIO; |
FUJITA Tomonori | abf5439 | 2008-08-16 14:10:05 +0900 | [diff] [blame] | 843 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 844 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 845 | "sg_ioctl: cmd=0x%x\n", (int) cmd_in)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); |
| 847 | |
| 848 | switch (cmd_in) { |
| 849 | case SG_IO: |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 850 | if (atomic_read(&sdp->detaching)) |
Jörn Engel | dddbf8d | 2012-04-12 17:32:17 -0400 | [diff] [blame] | 851 | return -ENODEV; |
| 852 | if (!scsi_block_when_processing_errors(sdp->device)) |
| 853 | return -ENXIO; |
| 854 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) |
| 855 | return -EFAULT; |
| 856 | result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, |
| 857 | 1, read_only, 1, &srp); |
| 858 | if (result < 0) |
| 859 | return result; |
Jörn Engel | 3f0c6ab | 2012-04-12 17:33:25 -0400 | [diff] [blame] | 860 | result = wait_event_interruptible(sfp->read_wait, |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 861 | (srp_done(sfp, srp) || atomic_read(&sdp->detaching))); |
| 862 | if (atomic_read(&sdp->detaching)) |
Jörn Engel | 794c10f | 2012-04-12 17:32:48 -0400 | [diff] [blame] | 863 | return -ENODEV; |
| 864 | write_lock_irq(&sfp->rq_list_lock); |
| 865 | if (srp->done) { |
| 866 | srp->done = 2; |
Jörn Engel | dddbf8d | 2012-04-12 17:32:17 -0400 | [diff] [blame] | 867 | write_unlock_irq(&sfp->rq_list_lock); |
Jörn Engel | 794c10f | 2012-04-12 17:32:48 -0400 | [diff] [blame] | 868 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); |
| 869 | return (result < 0) ? result : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | } |
Jörn Engel | 794c10f | 2012-04-12 17:32:48 -0400 | [diff] [blame] | 871 | srp->orphan = 1; |
| 872 | write_unlock_irq(&sfp->rq_list_lock); |
| 873 | return result; /* -ERESTARTSYS because signal hit process */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | case SG_SET_TIMEOUT: |
| 875 | result = get_user(val, ip); |
| 876 | if (result) |
| 877 | return result; |
| 878 | if (val < 0) |
| 879 | return -EIO; |
| 880 | if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) |
| 881 | val = MULDIV (INT_MAX, USER_HZ, HZ); |
| 882 | sfp->timeout_user = val; |
| 883 | sfp->timeout = MULDIV (val, HZ, USER_HZ); |
| 884 | |
| 885 | return 0; |
| 886 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ |
| 887 | /* strange ..., for backward compatibility */ |
| 888 | return sfp->timeout_user; |
| 889 | case SG_SET_FORCE_LOW_DMA: |
| 890 | result = get_user(val, ip); |
| 891 | if (result) |
| 892 | return result; |
| 893 | if (val) { |
| 894 | sfp->low_dma = 1; |
| 895 | if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { |
| 896 | val = (int) sfp->reserve.bufflen; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 897 | sg_remove_scat(sfp, &sfp->reserve); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | sg_build_reserve(sfp, val); |
| 899 | } |
| 900 | } else { |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 901 | if (atomic_read(&sdp->detaching)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | return -ENODEV; |
| 903 | sfp->low_dma = sdp->device->host->unchecked_isa_dma; |
| 904 | } |
| 905 | return 0; |
| 906 | case SG_GET_LOW_DMA: |
| 907 | return put_user((int) sfp->low_dma, ip); |
| 908 | case SG_GET_SCSI_ID: |
| 909 | if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) |
| 910 | return -EFAULT; |
| 911 | else { |
| 912 | sg_scsi_id_t __user *sg_idp = p; |
| 913 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 914 | if (atomic_read(&sdp->detaching)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | return -ENODEV; |
| 916 | __put_user((int) sdp->device->host->host_no, |
| 917 | &sg_idp->host_no); |
| 918 | __put_user((int) sdp->device->channel, |
| 919 | &sg_idp->channel); |
| 920 | __put_user((int) sdp->device->id, &sg_idp->scsi_id); |
| 921 | __put_user((int) sdp->device->lun, &sg_idp->lun); |
| 922 | __put_user((int) sdp->device->type, &sg_idp->scsi_type); |
| 923 | __put_user((short) sdp->device->host->cmd_per_lun, |
| 924 | &sg_idp->h_cmd_per_lun); |
| 925 | __put_user((short) sdp->device->queue_depth, |
| 926 | &sg_idp->d_queue_depth); |
| 927 | __put_user(0, &sg_idp->unused[0]); |
| 928 | __put_user(0, &sg_idp->unused[1]); |
| 929 | return 0; |
| 930 | } |
| 931 | case SG_SET_FORCE_PACK_ID: |
| 932 | result = get_user(val, ip); |
| 933 | if (result) |
| 934 | return result; |
| 935 | sfp->force_packid = val ? 1 : 0; |
| 936 | return 0; |
| 937 | case SG_GET_PACK_ID: |
| 938 | if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) |
| 939 | return -EFAULT; |
| 940 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 941 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { |
| 942 | if ((1 == srp->done) && (!srp->sg_io_owned)) { |
| 943 | read_unlock_irqrestore(&sfp->rq_list_lock, |
| 944 | iflags); |
| 945 | __put_user(srp->header.pack_id, ip); |
| 946 | return 0; |
| 947 | } |
| 948 | } |
| 949 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 950 | __put_user(-1, ip); |
| 951 | return 0; |
| 952 | case SG_GET_NUM_WAITING: |
| 953 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 954 | for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { |
| 955 | if ((1 == srp->done) && (!srp->sg_io_owned)) |
| 956 | ++val; |
| 957 | } |
| 958 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 959 | return put_user(val, ip); |
| 960 | case SG_GET_SG_TABLESIZE: |
| 961 | return put_user(sdp->sg_tablesize, ip); |
| 962 | case SG_SET_RESERVED_SIZE: |
| 963 | result = get_user(val, ip); |
| 964 | if (result) |
| 965 | return result; |
| 966 | if (val < 0) |
| 967 | return -EINVAL; |
Alan Stern | 44ec954 | 2007-02-20 11:01:57 -0500 | [diff] [blame] | 968 | val = min_t(int, val, |
Akinobu Mita | 46f69e6 | 2014-06-02 22:56:46 +0900 | [diff] [blame] | 969 | max_sectors_bytes(sdp->device->request_queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | if (val != sfp->reserve.bufflen) { |
| 971 | if (sg_res_in_use(sfp) || sfp->mmap_called) |
| 972 | return -EBUSY; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 973 | sg_remove_scat(sfp, &sfp->reserve); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | sg_build_reserve(sfp, val); |
| 975 | } |
| 976 | return 0; |
| 977 | case SG_GET_RESERVED_SIZE: |
Alan Stern | 44ec954 | 2007-02-20 11:01:57 -0500 | [diff] [blame] | 978 | val = min_t(int, sfp->reserve.bufflen, |
Akinobu Mita | 46f69e6 | 2014-06-02 22:56:46 +0900 | [diff] [blame] | 979 | max_sectors_bytes(sdp->device->request_queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | return put_user(val, ip); |
| 981 | case SG_SET_COMMAND_Q: |
| 982 | result = get_user(val, ip); |
| 983 | if (result) |
| 984 | return result; |
| 985 | sfp->cmd_q = val ? 1 : 0; |
| 986 | return 0; |
| 987 | case SG_GET_COMMAND_Q: |
| 988 | return put_user((int) sfp->cmd_q, ip); |
| 989 | case SG_SET_KEEP_ORPHAN: |
| 990 | result = get_user(val, ip); |
| 991 | if (result) |
| 992 | return result; |
| 993 | sfp->keep_orphan = val; |
| 994 | return 0; |
| 995 | case SG_GET_KEEP_ORPHAN: |
| 996 | return put_user((int) sfp->keep_orphan, ip); |
| 997 | case SG_NEXT_CMD_LEN: |
| 998 | result = get_user(val, ip); |
| 999 | if (result) |
| 1000 | return result; |
| 1001 | sfp->next_cmd_len = (val > 0) ? val : 0; |
| 1002 | return 0; |
| 1003 | case SG_GET_VERSION_NUM: |
| 1004 | return put_user(sg_version_num, ip); |
| 1005 | case SG_GET_ACCESS_COUNT: |
| 1006 | /* faked - we don't have a real access count anymore */ |
| 1007 | val = (sdp->device ? 1 : 0); |
| 1008 | return put_user(val, ip); |
| 1009 | case SG_GET_REQUEST_TABLE: |
| 1010 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) |
| 1011 | return -EFAULT; |
| 1012 | else { |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 1013 | sg_req_info_t *rinfo; |
| 1014 | unsigned int ms; |
| 1015 | |
| 1016 | rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, |
| 1017 | GFP_KERNEL); |
| 1018 | if (!rinfo) |
| 1019 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 1021 | for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; |
| 1022 | ++val, srp = srp ? srp->nextrp : srp) { |
| 1023 | memset(&rinfo[val], 0, SZ_SG_REQ_INFO); |
| 1024 | if (srp) { |
| 1025 | rinfo[val].req_state = srp->done + 1; |
| 1026 | rinfo[val].problem = |
| 1027 | srp->header.masked_status & |
| 1028 | srp->header.host_status & |
| 1029 | srp->header.driver_status; |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 1030 | if (srp->done) |
| 1031 | rinfo[val].duration = |
| 1032 | srp->header.duration; |
| 1033 | else { |
| 1034 | ms = jiffies_to_msecs(jiffies); |
| 1035 | rinfo[val].duration = |
| 1036 | (ms > srp->header.duration) ? |
| 1037 | (ms - srp->header.duration) : 0; |
| 1038 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | rinfo[val].orphan = srp->orphan; |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 1040 | rinfo[val].sg_io_owned = |
| 1041 | srp->sg_io_owned; |
| 1042 | rinfo[val].pack_id = |
| 1043 | srp->header.pack_id; |
| 1044 | rinfo[val].usr_ptr = |
| 1045 | srp->header.usr_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | } |
| 1047 | } |
| 1048 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 1049 | result = __copy_to_user(p, rinfo, |
| 1050 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); |
| 1051 | result = result ? -EFAULT : 0; |
| 1052 | kfree(rinfo); |
| 1053 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | } |
| 1055 | case SG_EMULATED_HOST: |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1056 | if (atomic_read(&sdp->detaching)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | return -ENODEV; |
| 1058 | return put_user(sdp->device->host->hostt->emulated, ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | case SCSI_IOCTL_SEND_COMMAND: |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1060 | if (atomic_read(&sdp->detaching)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | return -ENODEV; |
| 1062 | if (read_only) { |
| 1063 | unsigned char opcode = WRITE_6; |
| 1064 | Scsi_Ioctl_Command __user *siocp = p; |
| 1065 | |
| 1066 | if (copy_from_user(&opcode, siocp->data, 1)) |
| 1067 | return -EFAULT; |
FUJITA Tomonori | 14e507b | 2008-07-26 18:03:24 +0900 | [diff] [blame] | 1068 | if (sg_allow_access(filp, &opcode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | return -EPERM; |
| 1070 | } |
Al Viro | e915e87 | 2008-09-02 17:16:41 -0400 | [diff] [blame] | 1071 | return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | case SG_SET_DEBUG: |
| 1073 | result = get_user(val, ip); |
| 1074 | if (result) |
| 1075 | return result; |
| 1076 | sdp->sgdebug = (char) val; |
| 1077 | return 0; |
Alan Stern | 44ec954 | 2007-02-20 11:01:57 -0500 | [diff] [blame] | 1078 | case BLKSECTGET: |
Akinobu Mita | 46f69e6 | 2014-06-02 22:56:46 +0900 | [diff] [blame] | 1079 | return put_user(max_sectors_bytes(sdp->device->request_queue), |
Alan Stern | 44ec954 | 2007-02-20 11:01:57 -0500 | [diff] [blame] | 1080 | ip); |
Christof Schmitt | 6da127a | 2008-01-11 10:09:43 +0100 | [diff] [blame] | 1081 | case BLKTRACESETUP: |
| 1082 | return blk_trace_setup(sdp->device->request_queue, |
| 1083 | sdp->disk->disk_name, |
Martin Peschke | 76e3a19 | 2009-01-30 15:46:23 +0100 | [diff] [blame] | 1084 | MKDEV(SCSI_GENERIC_MAJOR, sdp->index), |
Shawn Du | d0deef5 | 2009-04-14 13:58:56 +0800 | [diff] [blame] | 1085 | NULL, |
Christof Schmitt | 6da127a | 2008-01-11 10:09:43 +0100 | [diff] [blame] | 1086 | (char *)arg); |
| 1087 | case BLKTRACESTART: |
| 1088 | return blk_trace_startstop(sdp->device->request_queue, 1); |
| 1089 | case BLKTRACESTOP: |
| 1090 | return blk_trace_startstop(sdp->device->request_queue, 0); |
| 1091 | case BLKTRACETEARDOWN: |
| 1092 | return blk_trace_remove(sdp->device->request_queue); |
Christoph Hellwig | 906d15f | 2014-10-11 16:25:31 +0200 | [diff] [blame] | 1093 | case SCSI_IOCTL_GET_IDLUN: |
| 1094 | case SCSI_IOCTL_GET_BUS_NUMBER: |
| 1095 | case SCSI_IOCTL_PROBE_HOST: |
| 1096 | case SG_GET_TRANSFORM: |
| 1097 | case SG_SCSI_RESET: |
| 1098 | if (atomic_read(&sdp->detaching)) |
| 1099 | return -ENODEV; |
| 1100 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | default: |
| 1102 | if (read_only) |
| 1103 | return -EPERM; /* don't know so take safe approach */ |
Christoph Hellwig | 906d15f | 2014-10-11 16:25:31 +0200 | [diff] [blame] | 1104 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | } |
Christoph Hellwig | 906d15f | 2014-10-11 16:25:31 +0200 | [diff] [blame] | 1106 | |
| 1107 | result = scsi_ioctl_block_when_processing_errors(sdp->device, |
| 1108 | cmd_in, filp->f_flags & O_NDELAY); |
| 1109 | if (result) |
| 1110 | return result; |
| 1111 | return scsi_ioctl(sdp->device, cmd_in, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | } |
| 1113 | |
| 1114 | #ifdef CONFIG_COMPAT |
| 1115 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) |
| 1116 | { |
| 1117 | Sg_device *sdp; |
| 1118 | Sg_fd *sfp; |
| 1119 | struct scsi_device *sdev; |
| 1120 | |
| 1121 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 1122 | return -ENXIO; |
| 1123 | |
| 1124 | sdev = sdp->device; |
| 1125 | if (sdev->host->hostt->compat_ioctl) { |
| 1126 | int ret; |
| 1127 | |
| 1128 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); |
| 1129 | |
| 1130 | return ret; |
| 1131 | } |
| 1132 | |
| 1133 | return -ENOIOCTLCMD; |
| 1134 | } |
| 1135 | #endif |
| 1136 | |
| 1137 | static unsigned int |
| 1138 | sg_poll(struct file *filp, poll_table * wait) |
| 1139 | { |
| 1140 | unsigned int res = 0; |
| 1141 | Sg_device *sdp; |
| 1142 | Sg_fd *sfp; |
| 1143 | Sg_request *srp; |
| 1144 | int count = 0; |
| 1145 | unsigned long iflags; |
| 1146 | |
Jörn Engel | ebaf466 | 2012-04-12 17:33:39 -0400 | [diff] [blame] | 1147 | sfp = filp->private_data; |
| 1148 | if (!sfp) |
| 1149 | return POLLERR; |
| 1150 | sdp = sfp->parentdp; |
| 1151 | if (!sdp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | return POLLERR; |
| 1153 | poll_wait(filp, &sfp->read_wait, wait); |
| 1154 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 1155 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { |
| 1156 | /* if any read waiting, flag it */ |
| 1157 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) |
| 1158 | res = POLLIN | POLLRDNORM; |
| 1159 | ++count; |
| 1160 | } |
| 1161 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 1162 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1163 | if (atomic_read(&sdp->detaching)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | res |= POLLHUP; |
| 1165 | else if (!sfp->cmd_q) { |
| 1166 | if (0 == count) |
| 1167 | res |= POLLOUT | POLLWRNORM; |
| 1168 | } else if (count < SG_MAX_QUEUE) |
| 1169 | res |= POLLOUT | POLLWRNORM; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1170 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 1171 | "sg_poll: res=0x%x\n", (int) res)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | return res; |
| 1173 | } |
| 1174 | |
| 1175 | static int |
| 1176 | sg_fasync(int fd, struct file *filp, int mode) |
| 1177 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | Sg_device *sdp; |
| 1179 | Sg_fd *sfp; |
| 1180 | |
| 1181 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) |
| 1182 | return -ENXIO; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1183 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 1184 | "sg_fasync: mode=%d\n", mode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | |
Jonathan Corbet | 60aa492 | 2009-02-01 14:52:56 -0700 | [diff] [blame] | 1186 | return fasync_helper(fd, filp, mode, &sfp->async_qp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | } |
| 1188 | |
Nick Piggin | a13ff0b | 2008-02-07 18:46:06 -0800 | [diff] [blame] | 1189 | static int |
| 1190 | sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | { |
| 1192 | Sg_fd *sfp; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1193 | unsigned long offset, len, sa; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | Sg_scatter_hold *rsv_schp; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1195 | int k, length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | |
| 1197 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) |
Nick Piggin | a13ff0b | 2008-02-07 18:46:06 -0800 | [diff] [blame] | 1198 | return VM_FAULT_SIGBUS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | rsv_schp = &sfp->reserve; |
Nick Piggin | a13ff0b | 2008-02-07 18:46:06 -0800 | [diff] [blame] | 1200 | offset = vmf->pgoff << PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | if (offset >= rsv_schp->bufflen) |
Nick Piggin | a13ff0b | 2008-02-07 18:46:06 -0800 | [diff] [blame] | 1202 | return VM_FAULT_SIGBUS; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1203 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
| 1204 | "sg_vma_fault: offset=%lu, scatg=%d\n", |
| 1205 | offset, rsv_schp->k_use_sg)); |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1206 | sa = vma->vm_start; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1207 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
| 1208 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1209 | len = vma->vm_end - sa; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1210 | len = (len < length) ? len : length; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1211 | if (offset < len) { |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1212 | struct page *page = nth_page(rsv_schp->pages[k], |
| 1213 | offset >> PAGE_SHIFT); |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1214 | get_page(page); /* increment page count */ |
Nick Piggin | a13ff0b | 2008-02-07 18:46:06 -0800 | [diff] [blame] | 1215 | vmf->page = page; |
| 1216 | return 0; /* success */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | } |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1218 | sa += len; |
| 1219 | offset -= len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | } |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1221 | |
Nick Piggin | a13ff0b | 2008-02-07 18:46:06 -0800 | [diff] [blame] | 1222 | return VM_FAULT_SIGBUS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | } |
| 1224 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 1225 | static const struct vm_operations_struct sg_mmap_vm_ops = { |
Nick Piggin | a13ff0b | 2008-02-07 18:46:06 -0800 | [diff] [blame] | 1226 | .fault = sg_vma_fault, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | }; |
| 1228 | |
| 1229 | static int |
| 1230 | sg_mmap(struct file *filp, struct vm_area_struct *vma) |
| 1231 | { |
| 1232 | Sg_fd *sfp; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1233 | unsigned long req_sz, len, sa; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | Sg_scatter_hold *rsv_schp; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1235 | int k, length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | |
| 1237 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) |
| 1238 | return -ENXIO; |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 1239 | req_sz = vma->vm_end - vma->vm_start; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1240 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, |
| 1241 | "sg_mmap starting, vm_start=%p, len=%d\n", |
| 1242 | (void *) vma->vm_start, (int) req_sz)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | if (vma->vm_pgoff) |
| 1244 | return -EINVAL; /* want no offset */ |
| 1245 | rsv_schp = &sfp->reserve; |
| 1246 | if (req_sz > rsv_schp->bufflen) |
| 1247 | return -ENOMEM; /* cannot map more than reserved buffer */ |
| 1248 | |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1249 | sa = vma->vm_start; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1250 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
| 1251 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1252 | len = vma->vm_end - sa; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1253 | len = (len < length) ? len : length; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1254 | sa += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | } |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1256 | |
Nick Piggin | f9aed0e | 2006-03-22 00:08:30 -0800 | [diff] [blame] | 1257 | sfp->mmap_called = 1; |
Konstantin Khlebnikov | 314e51b | 2012-10-08 16:29:02 -0700 | [diff] [blame] | 1258 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | vma->vm_private_data = sfp; |
| 1260 | vma->vm_ops = &sg_mmap_vm_ops; |
| 1261 | return 0; |
| 1262 | } |
| 1263 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1264 | static void |
| 1265 | sg_rq_end_io_usercontext(struct work_struct *work) |
FUJITA Tomonori | c96952e | 2009-02-04 11:36:27 +0900 | [diff] [blame] | 1266 | { |
| 1267 | struct sg_request *srp = container_of(work, struct sg_request, ew.work); |
| 1268 | struct sg_fd *sfp = srp->parentfp; |
| 1269 | |
| 1270 | sg_finish_rem_req(srp); |
| 1271 | kref_put(&sfp->f_ref, sg_remove_sfp); |
| 1272 | } |
| 1273 | |
FUJITA Tomonori | a91a3a2 | 2008-09-02 22:50:01 +0900 | [diff] [blame] | 1274 | /* |
| 1275 | * This function is a "bottom half" handler that is called by the mid |
| 1276 | * level when a command is completed (or has failed). |
| 1277 | */ |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1278 | static void |
| 1279 | sg_rq_end_io(struct request *rq, int uptodate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | { |
FUJITA Tomonori | a91a3a2 | 2008-09-02 22:50:01 +0900 | [diff] [blame] | 1281 | struct sg_request *srp = rq->end_io_data; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1282 | Sg_device *sdp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | Sg_fd *sfp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | unsigned long iflags; |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 1285 | unsigned int ms; |
FUJITA Tomonori | a91a3a2 | 2008-09-02 22:50:01 +0900 | [diff] [blame] | 1286 | char *sense; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1287 | int result, resid, done = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1289 | if (WARN_ON(srp->done != 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | return; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | sfp = srp->parentfp; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1293 | if (WARN_ON(sfp == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | return; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1295 | |
| 1296 | sdp = sfp->parentdp; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1297 | if (unlikely(atomic_read(&sdp->detaching))) |
| 1298 | pr_info("%s: device detaching\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | |
FUJITA Tomonori | a91a3a2 | 2008-09-02 22:50:01 +0900 | [diff] [blame] | 1300 | sense = rq->sense; |
| 1301 | result = rq->errors; |
Tejun Heo | c3a4d78 | 2009-05-07 22:24:37 +0900 | [diff] [blame] | 1302 | resid = rq->resid_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1304 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, |
| 1305 | "sg_cmd_done: pack_id=%d, res=0x%x\n", |
| 1306 | srp->header.pack_id, result)); |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1307 | srp->header.resid = resid; |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 1308 | ms = jiffies_to_msecs(jiffies); |
| 1309 | srp->header.duration = (ms > srp->header.duration) ? |
| 1310 | (ms - srp->header.duration) : 0; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1311 | if (0 != result) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | struct scsi_sense_hdr sshdr; |
| 1313 | |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1314 | srp->header.status = 0xff & result; |
| 1315 | srp->header.masked_status = status_byte(result); |
| 1316 | srp->header.msg_status = msg_byte(result); |
| 1317 | srp->header.host_status = host_byte(result); |
| 1318 | srp->header.driver_status = driver_byte(result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | if ((sdp->sgdebug > 0) && |
| 1320 | ((CHECK_CONDITION == srp->header.masked_status) || |
| 1321 | (COMMAND_TERMINATED == srp->header.masked_status))) |
Hannes Reinecke | d811b84 | 2014-10-24 14:26:45 +0200 | [diff] [blame] | 1322 | __scsi_print_sense(sdp->device, __func__, sense, |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1323 | SCSI_SENSE_BUFFERSIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | |
| 1325 | /* Following if statement is a patch supplied by Eric Youngdale */ |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1326 | if (driver_byte(result) != 0 |
| 1327 | && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | && !scsi_sense_is_deferred(&sshdr) |
| 1329 | && sshdr.sense_key == UNIT_ATTENTION |
| 1330 | && sdp->device->removable) { |
| 1331 | /* Detected possible disc change. Set the bit - this */ |
| 1332 | /* may be used if there are filesystems using this device */ |
| 1333 | sdp->device->changed = 1; |
| 1334 | } |
| 1335 | } |
| 1336 | /* Rely on write phase to clean out srp status values, so no "else" */ |
| 1337 | |
Tony Battersby | 7568615 | 2015-02-13 12:09:44 -0500 | [diff] [blame] | 1338 | /* |
| 1339 | * Free the request as soon as it is complete so that its resources |
| 1340 | * can be reused without waiting for userspace to read() the |
| 1341 | * result. But keep the associated bio (if any) around until |
| 1342 | * blk_rq_unmap_user() can be called from user context. |
| 1343 | */ |
| 1344 | srp->rq = NULL; |
| 1345 | if (rq->cmd != rq->__cmd) |
| 1346 | kfree(rq->cmd); |
| 1347 | __blk_put_request(rq->q, rq); |
| 1348 | |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1349 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 1350 | if (unlikely(srp->orphan)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | if (sfp->keep_orphan) |
| 1352 | srp->sg_io_owned = 0; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1353 | else |
| 1354 | done = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | } |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1356 | srp->done = done; |
| 1357 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 1358 | |
| 1359 | if (likely(done)) { |
| 1360 | /* Now wake up any sg_read() that is waiting for this |
| 1361 | * packet. |
| 1362 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | wake_up_interruptible(&sfp->read_wait); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1364 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); |
FUJITA Tomonori | c96952e | 2009-02-04 11:36:27 +0900 | [diff] [blame] | 1365 | kref_put(&sfp->f_ref, sg_remove_sfp); |
FUJITA Tomonori | 015640e | 2009-04-03 19:28:06 +0900 | [diff] [blame] | 1366 | } else { |
| 1367 | INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); |
| 1368 | schedule_work(&srp->ew.work); |
| 1369 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | } |
| 1371 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 1372 | static const struct file_operations sg_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | .owner = THIS_MODULE, |
| 1374 | .read = sg_read, |
| 1375 | .write = sg_write, |
| 1376 | .poll = sg_poll, |
Jörn Engel | 37b9d1e | 2012-04-12 17:35:05 -0400 | [diff] [blame] | 1377 | .unlocked_ioctl = sg_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | #ifdef CONFIG_COMPAT |
| 1379 | .compat_ioctl = sg_compat_ioctl, |
| 1380 | #endif |
| 1381 | .open = sg_open, |
| 1382 | .mmap = sg_mmap, |
| 1383 | .release = sg_release, |
| 1384 | .fasync = sg_fasync, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1385 | .llseek = no_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | }; |
| 1387 | |
gregkh@suse.de | d253878 | 2005-03-23 09:55:22 -0800 | [diff] [blame] | 1388 | static struct class *sg_sysfs_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | |
| 1390 | static int sg_sysfs_valid = 0; |
| 1391 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1392 | static Sg_device * |
| 1393 | sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | { |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1395 | struct request_queue *q = scsidp->request_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | Sg_device *sdp; |
| 1397 | unsigned long iflags; |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1398 | int error; |
| 1399 | u32 k; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | |
Jes Sorensen | 24669f75 | 2006-01-16 10:31:18 -0500 | [diff] [blame] | 1401 | sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | if (!sdp) { |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1403 | sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device " |
| 1404 | "failure\n", __func__); |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1405 | return ERR_PTR(-ENOMEM); |
| 1406 | } |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1407 | |
Tejun Heo | b98c52b | 2013-02-27 17:04:42 -0800 | [diff] [blame] | 1408 | idr_preload(GFP_KERNEL); |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1409 | write_lock_irqsave(&sg_index_lock, iflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | |
Tejun Heo | b98c52b | 2013-02-27 17:04:42 -0800 | [diff] [blame] | 1411 | error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); |
| 1412 | if (error < 0) { |
| 1413 | if (error == -ENOSPC) { |
| 1414 | sdev_printk(KERN_WARNING, scsidp, |
| 1415 | "Unable to attach sg device type=%d, minor number exceeds %d\n", |
| 1416 | scsidp->type, SG_MAX_DEVS - 1); |
| 1417 | error = -ENODEV; |
| 1418 | } else { |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1419 | sdev_printk(KERN_WARNING, scsidp, "%s: idr " |
| 1420 | "allocation Sg_device failure: %d\n", |
| 1421 | __func__, error); |
Tejun Heo | b98c52b | 2013-02-27 17:04:42 -0800 | [diff] [blame] | 1422 | } |
| 1423 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | } |
Tejun Heo | b98c52b | 2013-02-27 17:04:42 -0800 | [diff] [blame] | 1425 | k = error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1427 | SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp, |
| 1428 | "sg_alloc: dev=%d \n", k)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | sprintf(disk->disk_name, "sg%d", k); |
| 1430 | disk->first_minor = k; |
| 1431 | sdp->disk = disk; |
| 1432 | sdp->device = scsidp; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1433 | mutex_init(&sdp->open_rel_lock); |
FUJITA Tomonori | 3442f80 | 2009-02-16 13:26:53 +0900 | [diff] [blame] | 1434 | INIT_LIST_HEAD(&sdp->sfds); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1435 | init_waitqueue_head(&sdp->open_wait); |
| 1436 | atomic_set(&sdp->detaching, 0); |
| 1437 | rwlock_init(&sdp->sfd_lock); |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 1438 | sdp->sg_tablesize = queue_max_segments(q); |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1439 | sdp->index = k; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1440 | kref_init(&sdp->d_ref); |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1441 | error = 0; |
Tejun Heo | b98c52b | 2013-02-27 17:04:42 -0800 | [diff] [blame] | 1442 | |
| 1443 | out_unlock: |
| 1444 | write_unlock_irqrestore(&sg_index_lock, iflags); |
| 1445 | idr_preload_end(); |
| 1446 | |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1447 | if (error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | kfree(sdp); |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1449 | return ERR_PTR(error); |
| 1450 | } |
| 1451 | return sdp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | } |
| 1453 | |
| 1454 | static int |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1455 | sg_add_device(struct device *cl_dev, struct class_interface *cl_intf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | { |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 1457 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | struct gendisk *disk; |
| 1459 | Sg_device *sdp = NULL; |
| 1460 | struct cdev * cdev = NULL; |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1461 | int error; |
Ishai Rabinovitz | 454e895 | 2006-06-29 16:39:54 +0300 | [diff] [blame] | 1462 | unsigned long iflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | |
| 1464 | disk = alloc_disk(1); |
| 1465 | if (!disk) { |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1466 | pr_warn("%s: alloc_disk failed\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | return -ENOMEM; |
| 1468 | } |
| 1469 | disk->major = SCSI_GENERIC_MAJOR; |
| 1470 | |
| 1471 | error = -ENOMEM; |
| 1472 | cdev = cdev_alloc(); |
| 1473 | if (!cdev) { |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1474 | pr_warn("%s: cdev_alloc failed\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | goto out; |
| 1476 | } |
| 1477 | cdev->owner = THIS_MODULE; |
| 1478 | cdev->ops = &sg_fops; |
| 1479 | |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1480 | sdp = sg_alloc(disk, scsidp); |
| 1481 | if (IS_ERR(sdp)) { |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1482 | pr_warn("%s: sg_alloc failed\n", __func__); |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1483 | error = PTR_ERR(sdp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | goto out; |
| 1485 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1487 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); |
Greg KH | 5e3c34c | 2006-01-18 16:17:46 -0800 | [diff] [blame] | 1488 | if (error) |
Ishai Rabinovitz | 454e895 | 2006-06-29 16:39:54 +0300 | [diff] [blame] | 1489 | goto cdev_add_err; |
Greg KH | 5e3c34c | 2006-01-18 16:17:46 -0800 | [diff] [blame] | 1490 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | sdp->cdev = cdev; |
| 1492 | if (sg_sysfs_valid) { |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 1493 | struct device *sg_class_member; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | |
Greg Kroah-Hartman | d73a1a67 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 1495 | sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, |
| 1496 | MKDEV(SCSI_GENERIC_MAJOR, |
| 1497 | sdp->index), |
| 1498 | sdp, "%s", disk->disk_name); |
FUJITA Tomonori | d07e036 | 2008-01-15 13:18:00 +0900 | [diff] [blame] | 1499 | if (IS_ERR(sg_class_member)) { |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1500 | pr_err("%s: device_create failed\n", __func__); |
FUJITA Tomonori | d07e036 | 2008-01-15 13:18:00 +0900 | [diff] [blame] | 1501 | error = PTR_ERR(sg_class_member); |
| 1502 | goto cdev_add_err; |
| 1503 | } |
FUJITA Tomonori | d07e036 | 2008-01-15 13:18:00 +0900 | [diff] [blame] | 1504 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | &sg_class_member->kobj, "generic"); |
| 1506 | if (error) |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1507 | pr_err("%s: unable to make symlink 'generic' back " |
| 1508 | "to sg%d\n", __func__, sdp->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | } else |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1510 | pr_warn("%s: sg_sys Invalid\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1512 | sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d " |
| 1513 | "type %d\n", sdp->index, scsidp->type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 1515 | dev_set_drvdata(cl_dev, sdp); |
FUJITA Tomonori | a24484f | 2008-01-15 13:17:47 +0900 | [diff] [blame] | 1516 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | return 0; |
| 1518 | |
Ishai Rabinovitz | 454e895 | 2006-06-29 16:39:54 +0300 | [diff] [blame] | 1519 | cdev_add_err: |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1520 | write_lock_irqsave(&sg_index_lock, iflags); |
| 1521 | idr_remove(&sg_index_idr, sdp->index); |
| 1522 | write_unlock_irqrestore(&sg_index_lock, iflags); |
| 1523 | kfree(sdp); |
Ishai Rabinovitz | 454e895 | 2006-06-29 16:39:54 +0300 | [diff] [blame] | 1524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | out: |
| 1526 | put_disk(disk); |
| 1527 | if (cdev) |
| 1528 | cdev_del(cdev); |
| 1529 | return error; |
| 1530 | } |
| 1531 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1532 | static void |
| 1533 | sg_device_destroy(struct kref *kref) |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1534 | { |
| 1535 | struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); |
| 1536 | unsigned long flags; |
| 1537 | |
| 1538 | /* CAUTION! Note that the device can still be found via idr_find() |
| 1539 | * even though the refcount is 0. Therefore, do idr_remove() BEFORE |
| 1540 | * any other cleanup. |
| 1541 | */ |
| 1542 | |
| 1543 | write_lock_irqsave(&sg_index_lock, flags); |
| 1544 | idr_remove(&sg_index_idr, sdp->index); |
| 1545 | write_unlock_irqrestore(&sg_index_lock, flags); |
| 1546 | |
| 1547 | SCSI_LOG_TIMEOUT(3, |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1548 | sg_printk(KERN_INFO, sdp, "sg_device_destroy\n")); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1549 | |
| 1550 | put_disk(sdp->disk); |
| 1551 | kfree(sdp); |
| 1552 | } |
| 1553 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1554 | static void |
| 1555 | sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | { |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 1557 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
| 1558 | Sg_device *sdp = dev_get_drvdata(cl_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | unsigned long iflags; |
| 1560 | Sg_fd *sfp; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1561 | int val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1563 | if (!sdp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | return; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1565 | /* want sdp->detaching non-zero as soon as possible */ |
| 1566 | val = atomic_inc_return(&sdp->detaching); |
| 1567 | if (val > 1) |
| 1568 | return; /* only want to do following once per device */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1570 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 1571 | "%s\n", __func__)); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1572 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1573 | read_lock_irqsave(&sdp->sfd_lock, iflags); |
FUJITA Tomonori | 3442f80 | 2009-02-16 13:26:53 +0900 | [diff] [blame] | 1574 | list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1575 | wake_up_interruptible_all(&sfp->read_wait); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 1576 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | } |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1578 | wake_up_interruptible_all(&sdp->open_wait); |
| 1579 | read_unlock_irqrestore(&sdp->sfd_lock, iflags); |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1580 | |
| 1581 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 1582 | device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1583 | cdev_del(sdp->cdev); |
| 1584 | sdp->cdev = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1586 | kref_put(&sdp->d_ref, sg_device_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | } |
| 1588 | |
Douglas Gilbert | 6460e75 | 2006-09-20 18:20:49 -0400 | [diff] [blame] | 1589 | module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); |
| 1590 | module_param_named(def_reserved_size, def_reserved_size, int, |
| 1591 | S_IRUGO | S_IWUSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); |
| 1593 | |
| 1594 | MODULE_AUTHOR("Douglas Gilbert"); |
| 1595 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); |
| 1596 | MODULE_LICENSE("GPL"); |
| 1597 | MODULE_VERSION(SG_VERSION_STR); |
Rene Herman | f018fa5 | 2006-03-08 00:14:20 -0800 | [diff] [blame] | 1598 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | |
Douglas Gilbert | 6460e75 | 2006-09-20 18:20:49 -0400 | [diff] [blame] | 1600 | MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " |
| 1601 | "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); |
| 1603 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); |
| 1604 | |
| 1605 | static int __init |
| 1606 | init_sg(void) |
| 1607 | { |
| 1608 | int rc; |
| 1609 | |
Douglas Gilbert | 6460e75 | 2006-09-20 18:20:49 -0400 | [diff] [blame] | 1610 | if (scatter_elem_sz < PAGE_SIZE) { |
| 1611 | scatter_elem_sz = PAGE_SIZE; |
| 1612 | scatter_elem_sz_prev = scatter_elem_sz; |
| 1613 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | if (def_reserved_size >= 0) |
| 1615 | sg_big_buff = def_reserved_size; |
Douglas Gilbert | 6460e75 | 2006-09-20 18:20:49 -0400 | [diff] [blame] | 1616 | else |
| 1617 | def_reserved_size = sg_big_buff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | |
| 1619 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), |
| 1620 | SG_MAX_DEVS, "sg"); |
| 1621 | if (rc) |
| 1622 | return rc; |
gregkh@suse.de | d253878 | 2005-03-23 09:55:22 -0800 | [diff] [blame] | 1623 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | if ( IS_ERR(sg_sysfs_class) ) { |
| 1625 | rc = PTR_ERR(sg_sysfs_class); |
| 1626 | goto err_out; |
| 1627 | } |
| 1628 | sg_sysfs_valid = 1; |
| 1629 | rc = scsi_register_interface(&sg_interface); |
| 1630 | if (0 == rc) { |
| 1631 | #ifdef CONFIG_SCSI_PROC_FS |
| 1632 | sg_proc_init(); |
| 1633 | #endif /* CONFIG_SCSI_PROC_FS */ |
| 1634 | return 0; |
| 1635 | } |
gregkh@suse.de | d253878 | 2005-03-23 09:55:22 -0800 | [diff] [blame] | 1636 | class_destroy(sg_sysfs_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | err_out: |
| 1638 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); |
| 1639 | return rc; |
| 1640 | } |
| 1641 | |
| 1642 | static void __exit |
| 1643 | exit_sg(void) |
| 1644 | { |
| 1645 | #ifdef CONFIG_SCSI_PROC_FS |
| 1646 | sg_proc_cleanup(); |
| 1647 | #endif /* CONFIG_SCSI_PROC_FS */ |
| 1648 | scsi_unregister_interface(&sg_interface); |
gregkh@suse.de | d253878 | 2005-03-23 09:55:22 -0800 | [diff] [blame] | 1649 | class_destroy(sg_sysfs_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | sg_sysfs_valid = 0; |
| 1651 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), |
| 1652 | SG_MAX_DEVS); |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 1653 | idr_destroy(&sg_index_idr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | } |
| 1655 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1656 | static int |
| 1657 | sg_start_req(Sg_request *srp, unsigned char *cmd) |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 1658 | { |
FUJITA Tomonori | 626710c | 2008-09-02 22:50:05 +0900 | [diff] [blame] | 1659 | int res; |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 1660 | struct request *rq; |
FUJITA Tomonori | 44c7b0e | 2008-09-02 22:50:04 +0900 | [diff] [blame] | 1661 | Sg_fd *sfp = srp->parentfp; |
| 1662 | sg_io_hdr_t *hp = &srp->header; |
| 1663 | int dxfer_len = (int) hp->dxfer_len; |
| 1664 | int dxfer_dir = hp->dxfer_direction; |
FUJITA Tomonori | 626710c | 2008-09-02 22:50:05 +0900 | [diff] [blame] | 1665 | unsigned int iov_count = hp->iovec_count; |
FUJITA Tomonori | 44c7b0e | 2008-09-02 22:50:04 +0900 | [diff] [blame] | 1666 | Sg_scatter_hold *req_schp = &srp->data; |
| 1667 | Sg_scatter_hold *rsv_schp = &sfp->reserve; |
| 1668 | struct request_queue *q = sfp->parentdp->device->request_queue; |
FUJITA Tomonori | 626710c | 2008-09-02 22:50:05 +0900 | [diff] [blame] | 1669 | struct rq_map_data *md, map_data; |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 1670 | int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 1671 | unsigned char *long_cmdp = NULL; |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 1672 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1673 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 1674 | "sg_start_req: dxfer_len=%d\n", |
| 1675 | dxfer_len)); |
FUJITA Tomonori | 44c7b0e | 2008-09-02 22:50:04 +0900 | [diff] [blame] | 1676 | |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 1677 | if (hp->cmd_len > BLK_MAX_CDB) { |
| 1678 | long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL); |
| 1679 | if (!long_cmdp) |
| 1680 | return -ENOMEM; |
| 1681 | } |
| 1682 | |
Tony Battersby | 7772855a | 2015-02-13 12:10:58 -0500 | [diff] [blame] | 1683 | /* |
| 1684 | * NOTE |
| 1685 | * |
| 1686 | * With scsi-mq enabled, there are a fixed number of preallocated |
| 1687 | * requests equal in number to shost->can_queue. If all of the |
| 1688 | * preallocated requests are already in use, then using GFP_ATOMIC with |
| 1689 | * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL |
| 1690 | * will cause blk_get_request() to sleep until an active command |
| 1691 | * completes, freeing up a request. Neither option is ideal, but |
| 1692 | * GFP_KERNEL is the better choice to prevent userspace from getting an |
| 1693 | * unexpected EWOULDBLOCK. |
| 1694 | * |
| 1695 | * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually |
| 1696 | * does not sleep except under memory pressure. |
| 1697 | */ |
| 1698 | rq = blk_get_request(q, rw, GFP_KERNEL); |
Joe Lawrence | a492f07 | 2014-08-28 08:15:21 -0600 | [diff] [blame] | 1699 | if (IS_ERR(rq)) { |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 1700 | kfree(long_cmdp); |
Joe Lawrence | a492f07 | 2014-08-28 08:15:21 -0600 | [diff] [blame] | 1701 | return PTR_ERR(rq); |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 1702 | } |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 1703 | |
Jens Axboe | f27b087 | 2014-06-06 07:57:37 -0600 | [diff] [blame] | 1704 | blk_rq_set_block_pc(rq); |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 1705 | |
| 1706 | if (hp->cmd_len > BLK_MAX_CDB) |
| 1707 | rq->cmd = long_cmdp; |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 1708 | memcpy(rq->cmd, cmd, hp->cmd_len); |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 1709 | rq->cmd_len = hp->cmd_len; |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 1710 | |
| 1711 | srp->rq = rq; |
| 1712 | rq->end_io_data = srp; |
| 1713 | rq->sense = srp->sense_b; |
| 1714 | rq->retries = SG_DEFAULT_RETRIES; |
| 1715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1717 | return 0; |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 1718 | |
FUJITA Tomonori | 626710c | 2008-09-02 22:50:05 +0900 | [diff] [blame] | 1719 | if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && |
| 1720 | dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && |
| 1721 | !sfp->parentdp->device->host->unchecked_isa_dma && |
Namhyung Kim | 2610a25 | 2010-09-16 12:55:57 +0900 | [diff] [blame] | 1722 | blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) |
FUJITA Tomonori | 626710c | 2008-09-02 22:50:05 +0900 | [diff] [blame] | 1723 | md = NULL; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1724 | else |
FUJITA Tomonori | 626710c | 2008-09-02 22:50:05 +0900 | [diff] [blame] | 1725 | md = &map_data; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1726 | |
FUJITA Tomonori | 626710c | 2008-09-02 22:50:05 +0900 | [diff] [blame] | 1727 | if (md) { |
| 1728 | if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) |
| 1729 | sg_link_reserve(sfp, srp, dxfer_len); |
| 1730 | else { |
| 1731 | res = sg_build_indirect(req_schp, sfp, dxfer_len); |
| 1732 | if (res) |
| 1733 | return res; |
| 1734 | } |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1735 | |
FUJITA Tomonori | 626710c | 2008-09-02 22:50:05 +0900 | [diff] [blame] | 1736 | md->pages = req_schp->pages; |
| 1737 | md->page_order = req_schp->page_order; |
| 1738 | md->nr_entries = req_schp->k_use_sg; |
FUJITA Tomonori | 56c451f | 2008-12-18 14:49:37 +0900 | [diff] [blame] | 1739 | md->offset = 0; |
FUJITA Tomonori | 97ae77a | 2008-12-18 14:49:38 +0900 | [diff] [blame] | 1740 | md->null_mapped = hp->dxferp ? 0 : 1; |
FUJITA Tomonori | ecb554a | 2009-07-09 14:46:53 +0200 | [diff] [blame] | 1741 | if (dxfer_dir == SG_DXFER_TO_FROM_DEV) |
| 1742 | md->from_user = 1; |
| 1743 | else |
| 1744 | md->from_user = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | } |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1746 | |
FUJITA Tomonori | 0fdf96b | 2009-04-03 09:12:20 +0900 | [diff] [blame] | 1747 | if (iov_count) { |
Al Viro | fdc81f4 | 2015-03-21 20:25:30 -0400 | [diff] [blame] | 1748 | struct iovec *iov = NULL; |
Kent Overstreet | 26e49cf | 2015-01-18 16:16:31 +0100 | [diff] [blame] | 1749 | struct iov_iter i; |
FUJITA Tomonori | 0fdf96b | 2009-04-03 09:12:20 +0900 | [diff] [blame] | 1750 | |
Al Viro | fdc81f4 | 2015-03-21 20:25:30 -0400 | [diff] [blame] | 1751 | res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i); |
| 1752 | if (res < 0) |
| 1753 | return res; |
FUJITA Tomonori | 0fdf96b | 2009-04-03 09:12:20 +0900 | [diff] [blame] | 1754 | |
Al Viro | fdc81f4 | 2015-03-21 20:25:30 -0400 | [diff] [blame] | 1755 | iov_iter_truncate(&i, hp->dxfer_len); |
FUJITA Tomonori | 0fdf96b | 2009-04-03 09:12:20 +0900 | [diff] [blame] | 1756 | |
Kent Overstreet | 26e49cf | 2015-01-18 16:16:31 +0100 | [diff] [blame] | 1757 | res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC); |
FUJITA Tomonori | 0fdf96b | 2009-04-03 09:12:20 +0900 | [diff] [blame] | 1758 | kfree(iov); |
| 1759 | } else |
FUJITA Tomonori | 626710c | 2008-09-02 22:50:05 +0900 | [diff] [blame] | 1760 | res = blk_rq_map_user(q, rq, md, hp->dxferp, |
| 1761 | hp->dxfer_len, GFP_ATOMIC); |
| 1762 | |
| 1763 | if (!res) { |
| 1764 | srp->bio = rq->bio; |
| 1765 | |
| 1766 | if (!md) { |
| 1767 | req_schp->dio_in_use = 1; |
| 1768 | hp->info |= SG_INFO_DIRECT_IO; |
| 1769 | } |
| 1770 | } |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1771 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | } |
| 1773 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 1774 | static int |
| 1775 | sg_finish_rem_req(Sg_request *srp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | { |
FUJITA Tomonori | e7ee4cc | 2009-04-04 00:35:42 +0900 | [diff] [blame] | 1777 | int ret = 0; |
| 1778 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | Sg_fd *sfp = srp->parentfp; |
| 1780 | Sg_scatter_hold *req_schp = &srp->data; |
| 1781 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1782 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 1783 | "sg_finish_rem_req: res_used=%d\n", |
| 1784 | (int) srp->res_used)); |
Tony Battersby | 7568615 | 2015-02-13 12:09:44 -0500 | [diff] [blame] | 1785 | if (srp->bio) |
| 1786 | ret = blk_rq_unmap_user(srp->bio); |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1787 | |
Tony Battersby | 7568615 | 2015-02-13 12:09:44 -0500 | [diff] [blame] | 1788 | if (srp->rq) { |
Douglas Gilbert | 65c26a0 | 2014-06-03 13:18:18 -0400 | [diff] [blame] | 1789 | if (srp->rq->cmd != srp->rq->__cmd) |
| 1790 | kfree(srp->rq->cmd); |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 1791 | blk_put_request(srp->rq); |
FUJITA Tomonori | 6e5a30c | 2008-08-28 16:17:08 +0900 | [diff] [blame] | 1792 | } |
FUJITA Tomonori | 10865df | 2008-08-28 16:17:07 +0900 | [diff] [blame] | 1793 | |
Christof Schmitt | e27168f | 2009-09-17 09:10:14 +0200 | [diff] [blame] | 1794 | if (srp->res_used) |
| 1795 | sg_unlink_reserve(sfp, srp); |
| 1796 | else |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1797 | sg_remove_scat(sfp, req_schp); |
Christof Schmitt | e27168f | 2009-09-17 09:10:14 +0200 | [diff] [blame] | 1798 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1799 | sg_remove_request(sfp, srp); |
FUJITA Tomonori | e7ee4cc | 2009-04-04 00:35:42 +0900 | [diff] [blame] | 1800 | |
| 1801 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | } |
| 1803 | |
| 1804 | static int |
| 1805 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) |
| 1806 | { |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1807 | int sg_bufflen = tablesize * sizeof(struct page *); |
Al Viro | 2d20eaf | 2006-02-01 06:31:40 -0500 | [diff] [blame] | 1808 | gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1810 | schp->pages = kzalloc(sg_bufflen, gfp_flags); |
| 1811 | if (!schp->pages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | schp->sglist_len = sg_bufflen; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1814 | return tablesize; /* number of scat_gath elements allocated */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1815 | } |
| 1816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | static int |
| 1818 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) |
| 1819 | { |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1820 | int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1821 | int sg_tablesize = sfp->parentdp->sg_tablesize; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1822 | int blk_size = buff_size, order; |
| 1823 | gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | |
Eric Sesterhenn | fb11993 | 2007-05-23 14:41:36 -0700 | [diff] [blame] | 1825 | if (blk_size < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | return -EFAULT; |
| 1827 | if (0 == blk_size) |
| 1828 | ++blk_size; /* don't know why */ |
FUJITA Tomonori | b2ed6c6 | 2009-02-12 02:42:57 +0900 | [diff] [blame] | 1829 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ |
| 1830 | blk_size = ALIGN(blk_size, SG_SECTOR_SZ); |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1831 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 1832 | "sg_build_indirect: buff_size=%d, blk_size=%d\n", |
| 1833 | buff_size, blk_size)); |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1834 | |
| 1835 | /* N.B. ret_sz carried into this block ... */ |
| 1836 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); |
| 1837 | if (mx_sc_elems < 0) |
| 1838 | return mx_sc_elems; /* most likely -ENOMEM */ |
| 1839 | |
Douglas Gilbert | 6460e75 | 2006-09-20 18:20:49 -0400 | [diff] [blame] | 1840 | num = scatter_elem_sz; |
| 1841 | if (unlikely(num != scatter_elem_sz_prev)) { |
| 1842 | if (num < PAGE_SIZE) { |
| 1843 | scatter_elem_sz = PAGE_SIZE; |
| 1844 | scatter_elem_sz_prev = PAGE_SIZE; |
| 1845 | } else |
| 1846 | scatter_elem_sz_prev = num; |
| 1847 | } |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1848 | |
| 1849 | if (sfp->low_dma) |
| 1850 | gfp_mask |= GFP_DMA; |
| 1851 | |
| 1852 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| 1853 | gfp_mask |= __GFP_ZERO; |
| 1854 | |
| 1855 | order = get_order(num); |
| 1856 | retry: |
| 1857 | ret_sz = 1 << (PAGE_SHIFT + order); |
| 1858 | |
| 1859 | for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; |
| 1860 | k++, rem_sz -= ret_sz) { |
| 1861 | |
Douglas Gilbert | 6460e75 | 2006-09-20 18:20:49 -0400 | [diff] [blame] | 1862 | num = (rem_sz > scatter_elem_sz_prev) ? |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1863 | scatter_elem_sz_prev : rem_sz; |
| 1864 | |
| 1865 | schp->pages[k] = alloc_pages(gfp_mask, order); |
| 1866 | if (!schp->pages[k]) |
| 1867 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | |
Douglas Gilbert | 6460e75 | 2006-09-20 18:20:49 -0400 | [diff] [blame] | 1869 | if (num == scatter_elem_sz_prev) { |
| 1870 | if (unlikely(ret_sz > scatter_elem_sz_prev)) { |
| 1871 | scatter_elem_sz = ret_sz; |
| 1872 | scatter_elem_sz_prev = ret_sz; |
| 1873 | } |
| 1874 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1875 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1876 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
| 1877 | "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n", |
| 1878 | k, num, ret_sz)); |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1879 | } /* end of for loop */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1881 | schp->page_order = order; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1882 | schp->k_use_sg = k; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1883 | SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, |
| 1884 | "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", |
| 1885 | k, rem_sz)); |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1886 | |
| 1887 | schp->bufflen = blk_size; |
| 1888 | if (rem_sz > 0) /* must have failed */ |
| 1889 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | return 0; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1891 | out: |
| 1892 | for (i = 0; i < k; i++) |
Michal Schmidt | e71044e | 2009-09-03 14:27:08 +0200 | [diff] [blame] | 1893 | __free_pages(schp->pages[i], order); |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1894 | |
| 1895 | if (--order >= 0) |
| 1896 | goto retry; |
| 1897 | |
| 1898 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | } |
| 1900 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | static void |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1902 | sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | { |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1904 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 1905 | "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1906 | if (schp->pages && schp->sglist_len > 0) { |
FUJITA Tomonori | 6e5a30c | 2008-08-28 16:17:08 +0900 | [diff] [blame] | 1907 | if (!schp->dio_in_use) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | int k; |
| 1909 | |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1910 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1911 | SCSI_LOG_TIMEOUT(5, |
| 1912 | sg_printk(KERN_INFO, sfp->parentdp, |
| 1913 | "sg_remove_scat: k=%d, pg=0x%p\n", |
| 1914 | k, schp->pages[k])); |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1915 | __free_pages(schp->pages[k], schp->page_order); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | } |
FUJITA Tomonori | 6e5a30c | 2008-08-28 16:17:08 +0900 | [diff] [blame] | 1917 | |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1918 | kfree(schp->pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | } |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1920 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | memset(schp, 0, sizeof (*schp)); |
| 1922 | } |
| 1923 | |
| 1924 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) |
| 1926 | { |
| 1927 | Sg_scatter_hold *schp = &srp->data; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1928 | int k, num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1930 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
| 1931 | "sg_read_oxfer: num_read_xfer=%d\n", |
| 1932 | num_read_xfer)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1933 | if ((!outp) || (num_read_xfer <= 0)) |
| 1934 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1936 | num = 1 << (PAGE_SHIFT + schp->page_order); |
| 1937 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1938 | if (num > num_read_xfer) { |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1939 | if (__copy_to_user(outp, page_address(schp->pages[k]), |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1940 | num_read_xfer)) |
| 1941 | return -EFAULT; |
| 1942 | break; |
| 1943 | } else { |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1944 | if (__copy_to_user(outp, page_address(schp->pages[k]), |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1945 | num)) |
| 1946 | return -EFAULT; |
| 1947 | num_read_xfer -= num; |
| 1948 | if (num_read_xfer <= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | break; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1950 | outp += num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | } |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1953 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | return 0; |
| 1955 | } |
| 1956 | |
| 1957 | static void |
| 1958 | sg_build_reserve(Sg_fd * sfp, int req_size) |
| 1959 | { |
| 1960 | Sg_scatter_hold *schp = &sfp->reserve; |
| 1961 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1962 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 1963 | "sg_build_reserve: req_size=%d\n", req_size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | do { |
| 1965 | if (req_size < PAGE_SIZE) |
| 1966 | req_size = PAGE_SIZE; |
| 1967 | if (0 == sg_build_indirect(schp, sfp, req_size)) |
| 1968 | return; |
| 1969 | else |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1970 | sg_remove_scat(sfp, schp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | req_size >>= 1; /* divide by 2 */ |
| 1972 | } while (req_size > (PAGE_SIZE / 2)); |
| 1973 | } |
| 1974 | |
| 1975 | static void |
| 1976 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) |
| 1977 | { |
| 1978 | Sg_scatter_hold *req_schp = &srp->data; |
| 1979 | Sg_scatter_hold *rsv_schp = &sfp->reserve; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1980 | int k, num, rem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | |
| 1982 | srp->res_used = 1; |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 1983 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, |
| 1984 | "sg_link_reserve: size=%d\n", size)); |
Brian King | eca7be5 | 2006-02-14 12:42:24 -0600 | [diff] [blame] | 1985 | rem = size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1987 | num = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
| 1988 | for (k = 0; k < rsv_schp->k_use_sg; k++) { |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1989 | if (rem <= num) { |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1990 | req_schp->k_use_sg = k + 1; |
| 1991 | req_schp->sglist_len = rsv_schp->sglist_len; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1992 | req_schp->pages = rsv_schp->pages; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1993 | |
| 1994 | req_schp->bufflen = size; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 1995 | req_schp->page_order = rsv_schp->page_order; |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 1996 | break; |
| 1997 | } else |
| 1998 | rem -= num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | } |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 2000 | |
| 2001 | if (k >= rsv_schp->k_use_sg) |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 2002 | SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, |
| 2003 | "sg_link_reserve: BAD size\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2004 | } |
| 2005 | |
| 2006 | static void |
| 2007 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) |
| 2008 | { |
| 2009 | Sg_scatter_hold *req_schp = &srp->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 2011 | SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, |
| 2012 | "sg_unlink_reserve: req->k_use_sg=%d\n", |
| 2013 | (int) req_schp->k_use_sg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | req_schp->k_use_sg = 0; |
| 2015 | req_schp->bufflen = 0; |
FUJITA Tomonori | 10db10d | 2008-08-29 12:32:18 +0200 | [diff] [blame] | 2016 | req_schp->pages = NULL; |
| 2017 | req_schp->page_order = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | req_schp->sglist_len = 0; |
| 2019 | sfp->save_scat_len = 0; |
| 2020 | srp->res_used = 0; |
| 2021 | } |
| 2022 | |
| 2023 | static Sg_request * |
| 2024 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) |
| 2025 | { |
| 2026 | Sg_request *resp; |
| 2027 | unsigned long iflags; |
| 2028 | |
| 2029 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 2030 | for (resp = sfp->headrp; resp; resp = resp->nextrp) { |
| 2031 | /* look for requests that are ready + not SG_IO owned */ |
| 2032 | if ((1 == resp->done) && (!resp->sg_io_owned) && |
| 2033 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { |
| 2034 | resp->done = 2; /* guard against other readers */ |
| 2035 | break; |
| 2036 | } |
| 2037 | } |
| 2038 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 2039 | return resp; |
| 2040 | } |
| 2041 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2042 | /* always adds to end of list */ |
| 2043 | static Sg_request * |
| 2044 | sg_add_request(Sg_fd * sfp) |
| 2045 | { |
| 2046 | int k; |
| 2047 | unsigned long iflags; |
| 2048 | Sg_request *resp; |
| 2049 | Sg_request *rp = sfp->req_arr; |
| 2050 | |
| 2051 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 2052 | resp = sfp->headrp; |
| 2053 | if (!resp) { |
| 2054 | memset(rp, 0, sizeof (Sg_request)); |
| 2055 | rp->parentfp = sfp; |
| 2056 | resp = rp; |
| 2057 | sfp->headrp = resp; |
| 2058 | } else { |
| 2059 | if (0 == sfp->cmd_q) |
| 2060 | resp = NULL; /* command queuing disallowed */ |
| 2061 | else { |
| 2062 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { |
| 2063 | if (!rp->parentfp) |
| 2064 | break; |
| 2065 | } |
| 2066 | if (k < SG_MAX_QUEUE) { |
| 2067 | memset(rp, 0, sizeof (Sg_request)); |
| 2068 | rp->parentfp = sfp; |
| 2069 | while (resp->nextrp) |
| 2070 | resp = resp->nextrp; |
| 2071 | resp->nextrp = rp; |
| 2072 | resp = rp; |
| 2073 | } else |
| 2074 | resp = NULL; |
| 2075 | } |
| 2076 | } |
| 2077 | if (resp) { |
| 2078 | resp->nextrp = NULL; |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 2079 | resp->header.duration = jiffies_to_msecs(jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2080 | } |
| 2081 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 2082 | return resp; |
| 2083 | } |
| 2084 | |
| 2085 | /* Return of 1 for found; 0 for not found */ |
| 2086 | static int |
| 2087 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) |
| 2088 | { |
| 2089 | Sg_request *prev_rp; |
| 2090 | Sg_request *rp; |
| 2091 | unsigned long iflags; |
| 2092 | int res = 0; |
| 2093 | |
| 2094 | if ((!sfp) || (!srp) || (!sfp->headrp)) |
| 2095 | return res; |
| 2096 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 2097 | prev_rp = sfp->headrp; |
| 2098 | if (srp == prev_rp) { |
| 2099 | sfp->headrp = prev_rp->nextrp; |
| 2100 | prev_rp->parentfp = NULL; |
| 2101 | res = 1; |
| 2102 | } else { |
| 2103 | while ((rp = prev_rp->nextrp)) { |
| 2104 | if (srp == rp) { |
| 2105 | prev_rp->nextrp = rp->nextrp; |
| 2106 | rp->parentfp = NULL; |
| 2107 | res = 1; |
| 2108 | break; |
| 2109 | } |
| 2110 | prev_rp = rp; |
| 2111 | } |
| 2112 | } |
| 2113 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 2114 | return res; |
| 2115 | } |
| 2116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | static Sg_fd * |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 2118 | sg_add_sfp(Sg_device * sdp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | { |
| 2120 | Sg_fd *sfp; |
| 2121 | unsigned long iflags; |
Alan Stern | 44ec954 | 2007-02-20 11:01:57 -0500 | [diff] [blame] | 2122 | int bufflen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 2124 | sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | if (!sfp) |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2126 | return ERR_PTR(-ENOMEM); |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 2127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | init_waitqueue_head(&sfp->read_wait); |
| 2129 | rwlock_init(&sfp->rq_list_lock); |
| 2130 | |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2131 | kref_init(&sfp->f_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | sfp->timeout = SG_DEFAULT_TIMEOUT; |
| 2133 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; |
| 2134 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; |
| 2135 | sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? |
| 2136 | sdp->device->host->unchecked_isa_dma : 1; |
| 2137 | sfp->cmd_q = SG_DEF_COMMAND_Q; |
| 2138 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; |
| 2139 | sfp->parentdp = sdp; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2140 | write_lock_irqsave(&sdp->sfd_lock, iflags); |
| 2141 | if (atomic_read(&sdp->detaching)) { |
| 2142 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
| 2143 | return ERR_PTR(-ENODEV); |
| 2144 | } |
FUJITA Tomonori | 3442f80 | 2009-02-16 13:26:53 +0900 | [diff] [blame] | 2145 | list_add_tail(&sfp->sfd_siblings, &sdp->sfds); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2146 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 2147 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 2148 | "sg_add_sfp: sfp=0x%p\n", sfp)); |
Douglas Gilbert | 6460e75 | 2006-09-20 18:20:49 -0400 | [diff] [blame] | 2149 | if (unlikely(sg_big_buff != def_reserved_size)) |
| 2150 | sg_big_buff = def_reserved_size; |
| 2151 | |
Alan Stern | 44ec954 | 2007-02-20 11:01:57 -0500 | [diff] [blame] | 2152 | bufflen = min_t(int, sg_big_buff, |
Akinobu Mita | 46f69e6 | 2014-06-02 22:56:46 +0900 | [diff] [blame] | 2153 | max_sectors_bytes(sdp->device->request_queue)); |
Alan Stern | 44ec954 | 2007-02-20 11:01:57 -0500 | [diff] [blame] | 2154 | sg_build_reserve(sfp, bufflen); |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 2155 | SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, |
| 2156 | "sg_add_sfp: bufflen=%d, k_use_sg=%d\n", |
| 2157 | sfp->reserve.bufflen, |
| 2158 | sfp->reserve.k_use_sg)); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2159 | |
| 2160 | kref_get(&sdp->d_ref); |
| 2161 | __module_get(THIS_MODULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | return sfp; |
| 2163 | } |
| 2164 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2165 | static void |
| 2166 | sg_remove_sfp_usercontext(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2167 | { |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2168 | struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); |
| 2169 | struct sg_device *sdp = sfp->parentdp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2171 | /* Cleanup any responses which were never read(). */ |
| 2172 | while (sfp->headrp) |
| 2173 | sg_finish_rem_req(sfp->headrp); |
| 2174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | if (sfp->reserve.bufflen > 0) { |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 2176 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
| 2177 | "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2178 | (int) sfp->reserve.bufflen, |
| 2179 | (int) sfp->reserve.k_use_sg)); |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 2180 | sg_remove_scat(sfp, &sfp->reserve); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | } |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2182 | |
Hannes Reinecke | 95e159d | 2014-06-25 16:39:55 +0200 | [diff] [blame] | 2183 | SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, |
| 2184 | "sg_remove_sfp: sfp=0x%p\n", sfp)); |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 2185 | kfree(sfp); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2186 | |
| 2187 | scsi_device_put(sdp->device); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2188 | kref_put(&sdp->d_ref, sg_device_destroy); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2189 | module_put(THIS_MODULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | } |
| 2191 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2192 | static void |
| 2193 | sg_remove_sfp(struct kref *kref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | { |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2195 | struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); |
James Bottomley | 065b4a2 | 2013-10-25 10:27:02 +0100 | [diff] [blame] | 2196 | struct sg_device *sdp = sfp->parentdp; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2197 | unsigned long iflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2199 | write_lock_irqsave(&sdp->sfd_lock, iflags); |
FUJITA Tomonori | 3442f80 | 2009-02-16 13:26:53 +0900 | [diff] [blame] | 2200 | list_del(&sfp->sfd_siblings); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2201 | write_unlock_irqrestore(&sdp->sfd_lock, iflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | |
FUJITA Tomonori | 015640e | 2009-04-03 19:28:06 +0900 | [diff] [blame] | 2203 | INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); |
| 2204 | schedule_work(&sfp->ew.work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | } |
| 2206 | |
| 2207 | static int |
| 2208 | sg_res_in_use(Sg_fd * sfp) |
| 2209 | { |
| 2210 | const Sg_request *srp; |
| 2211 | unsigned long iflags; |
| 2212 | |
| 2213 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
| 2214 | for (srp = sfp->headrp; srp; srp = srp->nextrp) |
| 2215 | if (srp->res_used) |
| 2216 | break; |
| 2217 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); |
| 2218 | return srp ? 1 : 0; |
| 2219 | } |
| 2220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | #ifdef CONFIG_SCSI_PROC_FS |
| 2222 | static int |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 2223 | sg_idr_max_id(int id, void *p, void *data) |
| 2224 | { |
| 2225 | int *k = data; |
| 2226 | |
| 2227 | if (*k < id) |
| 2228 | *k = id; |
| 2229 | |
| 2230 | return 0; |
| 2231 | } |
| 2232 | |
| 2233 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | sg_last_dev(void) |
| 2235 | { |
Tony Battersby | 53474c0 | 2008-01-22 15:25:49 -0500 | [diff] [blame] | 2236 | int k = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2237 | unsigned long iflags; |
| 2238 | |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 2239 | read_lock_irqsave(&sg_index_lock, iflags); |
| 2240 | idr_for_each(&sg_index_idr, sg_idr_max_id, &k); |
| 2241 | read_unlock_irqrestore(&sg_index_lock, iflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | return k + 1; /* origin 1 */ |
| 2243 | } |
| 2244 | #endif |
| 2245 | |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2246 | /* must be called with sg_index_lock held */ |
| 2247 | static Sg_device *sg_lookup_dev(int dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | { |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2249 | return idr_find(&sg_index_idr, dev); |
| 2250 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2252 | static Sg_device * |
| 2253 | sg_get_dev(int dev) |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2254 | { |
| 2255 | struct sg_device *sdp; |
| 2256 | unsigned long flags; |
| 2257 | |
| 2258 | read_lock_irqsave(&sg_index_lock, flags); |
| 2259 | sdp = sg_lookup_dev(dev); |
| 2260 | if (!sdp) |
| 2261 | sdp = ERR_PTR(-ENXIO); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2262 | else if (atomic_read(&sdp->detaching)) { |
| 2263 | /* If sdp->detaching, then the refcount may already be 0, in |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2264 | * which case it would be a bug to do kref_get(). |
| 2265 | */ |
| 2266 | sdp = ERR_PTR(-ENODEV); |
| 2267 | } else |
| 2268 | kref_get(&sdp->d_ref); |
| 2269 | read_unlock_irqrestore(&sg_index_lock, flags); |
James Bottomley | 7c07d61 | 2007-08-05 13:36:11 -0500 | [diff] [blame] | 2270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | return sdp; |
| 2272 | } |
| 2273 | |
| 2274 | #ifdef CONFIG_SCSI_PROC_FS |
| 2275 | |
| 2276 | static struct proc_dir_entry *sg_proc_sgp = NULL; |
| 2277 | |
| 2278 | static char sg_proc_sg_dirname[] = "scsi/sg"; |
| 2279 | |
| 2280 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); |
| 2281 | |
| 2282 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); |
| 2283 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, |
| 2284 | size_t count, loff_t *off); |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2285 | static const struct file_operations adio_fops = { |
| 2286 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | .open = sg_proc_single_open_adio, |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2288 | .read = seq_read, |
| 2289 | .llseek = seq_lseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | .write = sg_proc_write_adio, |
| 2291 | .release = single_release, |
| 2292 | }; |
| 2293 | |
| 2294 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); |
| 2295 | static ssize_t sg_proc_write_dressz(struct file *filp, |
| 2296 | const char __user *buffer, size_t count, loff_t *off); |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2297 | static const struct file_operations dressz_fops = { |
| 2298 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | .open = sg_proc_single_open_dressz, |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2300 | .read = seq_read, |
| 2301 | .llseek = seq_lseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | .write = sg_proc_write_dressz, |
| 2303 | .release = single_release, |
| 2304 | }; |
| 2305 | |
| 2306 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); |
| 2307 | static int sg_proc_single_open_version(struct inode *inode, struct file *file); |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2308 | static const struct file_operations version_fops = { |
| 2309 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2310 | .open = sg_proc_single_open_version, |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2311 | .read = seq_read, |
| 2312 | .llseek = seq_lseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2313 | .release = single_release, |
| 2314 | }; |
| 2315 | |
| 2316 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); |
| 2317 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2318 | static const struct file_operations devhdr_fops = { |
| 2319 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | .open = sg_proc_single_open_devhdr, |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2321 | .read = seq_read, |
| 2322 | .llseek = seq_lseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2323 | .release = single_release, |
| 2324 | }; |
| 2325 | |
| 2326 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); |
| 2327 | static int sg_proc_open_dev(struct inode *inode, struct file *file); |
| 2328 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); |
| 2329 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); |
| 2330 | static void dev_seq_stop(struct seq_file *s, void *v); |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2331 | static const struct file_operations dev_fops = { |
| 2332 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | .open = sg_proc_open_dev, |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2334 | .read = seq_read, |
| 2335 | .llseek = seq_lseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | .release = seq_release, |
| 2337 | }; |
James Morris | 88e9d34 | 2009-09-22 16:43:43 -0700 | [diff] [blame] | 2338 | static const struct seq_operations dev_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2339 | .start = dev_seq_start, |
| 2340 | .next = dev_seq_next, |
| 2341 | .stop = dev_seq_stop, |
| 2342 | .show = sg_proc_seq_show_dev, |
| 2343 | }; |
| 2344 | |
| 2345 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); |
| 2346 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file); |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2347 | static const struct file_operations devstrs_fops = { |
| 2348 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | .open = sg_proc_open_devstrs, |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2350 | .read = seq_read, |
| 2351 | .llseek = seq_lseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2352 | .release = seq_release, |
| 2353 | }; |
James Morris | 88e9d34 | 2009-09-22 16:43:43 -0700 | [diff] [blame] | 2354 | static const struct seq_operations devstrs_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2355 | .start = dev_seq_start, |
| 2356 | .next = dev_seq_next, |
| 2357 | .stop = dev_seq_stop, |
| 2358 | .show = sg_proc_seq_show_devstrs, |
| 2359 | }; |
| 2360 | |
| 2361 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); |
| 2362 | static int sg_proc_open_debug(struct inode *inode, struct file *file); |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2363 | static const struct file_operations debug_fops = { |
| 2364 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2365 | .open = sg_proc_open_debug, |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2366 | .read = seq_read, |
| 2367 | .llseek = seq_lseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2368 | .release = seq_release, |
| 2369 | }; |
James Morris | 88e9d34 | 2009-09-22 16:43:43 -0700 | [diff] [blame] | 2370 | static const struct seq_operations debug_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | .start = dev_seq_start, |
| 2372 | .next = dev_seq_next, |
| 2373 | .stop = dev_seq_stop, |
| 2374 | .show = sg_proc_seq_show_debug, |
| 2375 | }; |
| 2376 | |
| 2377 | |
| 2378 | struct sg_proc_leaf { |
| 2379 | const char * name; |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2380 | const struct file_operations * fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2381 | }; |
| 2382 | |
Jörn Engel | 18b8ba6 | 2012-04-12 17:35:25 -0400 | [diff] [blame] | 2383 | static const struct sg_proc_leaf sg_proc_leaf_arr[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2384 | {"allow_dio", &adio_fops}, |
| 2385 | {"debug", &debug_fops}, |
| 2386 | {"def_reserved_size", &dressz_fops}, |
| 2387 | {"device_hdr", &devhdr_fops}, |
| 2388 | {"devices", &dev_fops}, |
| 2389 | {"device_strs", &devstrs_fops}, |
| 2390 | {"version", &version_fops} |
| 2391 | }; |
| 2392 | |
| 2393 | static int |
| 2394 | sg_proc_init(void) |
| 2395 | { |
Tobias Klauser | 6391a11 | 2006-06-08 22:23:48 -0700 | [diff] [blame] | 2396 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
Al Viro | d161a13 | 2011-07-24 03:36:29 -0400 | [diff] [blame] | 2397 | int k; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2398 | |
Al Viro | 6660022 | 2005-09-28 22:32:57 +0100 | [diff] [blame] | 2399 | sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2400 | if (!sg_proc_sgp) |
| 2401 | return 1; |
| 2402 | for (k = 0; k < num_leaves; ++k) { |
Jörn Engel | 18b8ba6 | 2012-04-12 17:35:25 -0400 | [diff] [blame] | 2403 | const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k]; |
Al Viro | d161a13 | 2011-07-24 03:36:29 -0400 | [diff] [blame] | 2404 | umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; |
Denis V. Lunev | a973909 | 2008-04-29 01:02:17 -0700 | [diff] [blame] | 2405 | proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2406 | } |
| 2407 | return 0; |
| 2408 | } |
| 2409 | |
| 2410 | static void |
| 2411 | sg_proc_cleanup(void) |
| 2412 | { |
| 2413 | int k; |
Tobias Klauser | 6391a11 | 2006-06-08 22:23:48 -0700 | [diff] [blame] | 2414 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | |
| 2416 | if (!sg_proc_sgp) |
| 2417 | return; |
| 2418 | for (k = 0; k < num_leaves; ++k) |
| 2419 | remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); |
| 2420 | remove_proc_entry(sg_proc_sg_dirname, NULL); |
| 2421 | } |
| 2422 | |
| 2423 | |
| 2424 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) |
| 2425 | { |
| 2426 | seq_printf(s, "%d\n", *((int *)s->private)); |
| 2427 | return 0; |
| 2428 | } |
| 2429 | |
| 2430 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) |
| 2431 | { |
| 2432 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); |
| 2433 | } |
| 2434 | |
| 2435 | static ssize_t |
| 2436 | sg_proc_write_adio(struct file *filp, const char __user *buffer, |
| 2437 | size_t count, loff_t *off) |
| 2438 | { |
Stephen Boyd | 7e95fff | 2012-01-10 15:42:34 -0800 | [diff] [blame] | 2439 | int err; |
| 2440 | unsigned long num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2441 | |
| 2442 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| 2443 | return -EACCES; |
Stephen Boyd | 7e95fff | 2012-01-10 15:42:34 -0800 | [diff] [blame] | 2444 | err = kstrtoul_from_user(buffer, count, 0, &num); |
| 2445 | if (err) |
| 2446 | return err; |
| 2447 | sg_allow_dio = num ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2448 | return count; |
| 2449 | } |
| 2450 | |
| 2451 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) |
| 2452 | { |
| 2453 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); |
| 2454 | } |
| 2455 | |
| 2456 | static ssize_t |
| 2457 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, |
| 2458 | size_t count, loff_t *off) |
| 2459 | { |
Stephen Boyd | 7e95fff | 2012-01-10 15:42:34 -0800 | [diff] [blame] | 2460 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | unsigned long k = ULONG_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2462 | |
| 2463 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| 2464 | return -EACCES; |
Stephen Boyd | 7e95fff | 2012-01-10 15:42:34 -0800 | [diff] [blame] | 2465 | |
| 2466 | err = kstrtoul_from_user(buffer, count, 0, &k); |
| 2467 | if (err) |
| 2468 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2469 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ |
| 2470 | sg_big_buff = k; |
| 2471 | return count; |
| 2472 | } |
| 2473 | return -ERANGE; |
| 2474 | } |
| 2475 | |
| 2476 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) |
| 2477 | { |
| 2478 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, |
| 2479 | sg_version_date); |
| 2480 | return 0; |
| 2481 | } |
| 2482 | |
| 2483 | static int sg_proc_single_open_version(struct inode *inode, struct file *file) |
| 2484 | { |
| 2485 | return single_open(file, sg_proc_seq_show_version, NULL); |
| 2486 | } |
| 2487 | |
| 2488 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) |
| 2489 | { |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2490 | seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2491 | return 0; |
| 2492 | } |
| 2493 | |
| 2494 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) |
| 2495 | { |
| 2496 | return single_open(file, sg_proc_seq_show_devhdr, NULL); |
| 2497 | } |
| 2498 | |
| 2499 | struct sg_proc_deviter { |
| 2500 | loff_t index; |
| 2501 | size_t max; |
| 2502 | }; |
| 2503 | |
| 2504 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) |
| 2505 | { |
| 2506 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); |
| 2507 | |
Jan Blunck | 729d70f | 2005-08-27 11:07:52 -0700 | [diff] [blame] | 2508 | s->private = it; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2509 | if (! it) |
| 2510 | return NULL; |
Jan Blunck | 729d70f | 2005-08-27 11:07:52 -0700 | [diff] [blame] | 2511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2512 | it->index = *pos; |
| 2513 | it->max = sg_last_dev(); |
| 2514 | if (it->index >= it->max) |
Jan Blunck | 729d70f | 2005-08-27 11:07:52 -0700 | [diff] [blame] | 2515 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2516 | return it; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2517 | } |
| 2518 | |
| 2519 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 2520 | { |
Jan Blunck | 729d70f | 2005-08-27 11:07:52 -0700 | [diff] [blame] | 2521 | struct sg_proc_deviter * it = s->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2522 | |
| 2523 | *pos = ++it->index; |
| 2524 | return (it->index < it->max) ? it : NULL; |
| 2525 | } |
| 2526 | |
| 2527 | static void dev_seq_stop(struct seq_file *s, void *v) |
| 2528 | { |
Jan Blunck | 729d70f | 2005-08-27 11:07:52 -0700 | [diff] [blame] | 2529 | kfree(s->private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2530 | } |
| 2531 | |
| 2532 | static int sg_proc_open_dev(struct inode *inode, struct file *file) |
| 2533 | { |
| 2534 | return seq_open(file, &dev_seq_ops); |
| 2535 | } |
| 2536 | |
| 2537 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) |
| 2538 | { |
| 2539 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; |
| 2540 | Sg_device *sdp; |
| 2541 | struct scsi_device *scsidp; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2542 | unsigned long iflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2543 | |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2544 | read_lock_irqsave(&sg_index_lock, iflags); |
| 2545 | sdp = it ? sg_lookup_dev(it->index) : NULL; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2546 | if ((NULL == sdp) || (NULL == sdp->device) || |
| 2547 | (atomic_read(&sdp->detaching))) |
| 2548 | seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); |
| 2549 | else { |
| 2550 | scsidp = sdp->device; |
Hannes Reinecke | 9cb78c1 | 2014-06-25 15:27:36 +0200 | [diff] [blame] | 2551 | seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2552 | scsidp->host->host_no, scsidp->channel, |
| 2553 | scsidp->id, scsidp->lun, (int) scsidp->type, |
| 2554 | 1, |
| 2555 | (int) scsidp->queue_depth, |
Christoph Hellwig | 71e75c9 | 2014-04-11 19:07:01 +0200 | [diff] [blame] | 2556 | (int) atomic_read(&scsidp->device_busy), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2557 | (int) scsi_device_online(scsidp)); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2558 | } |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2559 | read_unlock_irqrestore(&sg_index_lock, iflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2560 | return 0; |
| 2561 | } |
| 2562 | |
| 2563 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file) |
| 2564 | { |
| 2565 | return seq_open(file, &devstrs_seq_ops); |
| 2566 | } |
| 2567 | |
| 2568 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) |
| 2569 | { |
| 2570 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; |
| 2571 | Sg_device *sdp; |
| 2572 | struct scsi_device *scsidp; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2573 | unsigned long iflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2574 | |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2575 | read_lock_irqsave(&sg_index_lock, iflags); |
| 2576 | sdp = it ? sg_lookup_dev(it->index) : NULL; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2577 | scsidp = sdp ? sdp->device : NULL; |
| 2578 | if (sdp && scsidp && (!atomic_read(&sdp->detaching))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2579 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", |
| 2580 | scsidp->vendor, scsidp->model, scsidp->rev); |
| 2581 | else |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2582 | seq_puts(s, "<no active device>\n"); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2583 | read_unlock_irqrestore(&sg_index_lock, iflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2584 | return 0; |
| 2585 | } |
| 2586 | |
James Bottomley | c0d3b9c | 2013-10-25 10:21:57 +0100 | [diff] [blame] | 2587 | /* must be called while holding sg_index_lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2588 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) |
| 2589 | { |
| 2590 | int k, m, new_interface, blen, usg; |
| 2591 | Sg_request *srp; |
| 2592 | Sg_fd *fp; |
| 2593 | const sg_io_hdr_t *hp; |
| 2594 | const char * cp; |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 2595 | unsigned int ms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2596 | |
FUJITA Tomonori | 3442f80 | 2009-02-16 13:26:53 +0900 | [diff] [blame] | 2597 | k = 0; |
| 2598 | list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { |
| 2599 | k++; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2600 | read_lock(&fp->rq_list_lock); /* irqs already disabled */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2601 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " |
FUJITA Tomonori | 3442f80 | 2009-02-16 13:26:53 +0900 | [diff] [blame] | 2602 | "(res)sgat=%d low_dma=%d\n", k, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2603 | jiffies_to_msecs(fp->timeout), |
| 2604 | fp->reserve.bufflen, |
| 2605 | (int) fp->reserve.k_use_sg, |
| 2606 | (int) fp->low_dma); |
Jörn Engel | ebaf466 | 2012-04-12 17:33:39 -0400 | [diff] [blame] | 2607 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2608 | (int) fp->cmd_q, (int) fp->force_packid, |
Jörn Engel | ebaf466 | 2012-04-12 17:33:39 -0400 | [diff] [blame] | 2609 | (int) fp->keep_orphan); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2610 | for (m = 0, srp = fp->headrp; |
| 2611 | srp != NULL; |
| 2612 | ++m, srp = srp->nextrp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2613 | hp = &srp->header; |
| 2614 | new_interface = (hp->interface_id == '\0') ? 0 : 1; |
| 2615 | if (srp->res_used) { |
| 2616 | if (new_interface && |
| 2617 | (SG_FLAG_MMAP_IO & hp->flags)) |
| 2618 | cp = " mmap>> "; |
| 2619 | else |
| 2620 | cp = " rb>> "; |
| 2621 | } else { |
| 2622 | if (SG_INFO_DIRECT_IO_MASK & hp->info) |
| 2623 | cp = " dio>> "; |
| 2624 | else |
| 2625 | cp = " "; |
| 2626 | } |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2627 | seq_puts(s, cp); |
Mike Christie | d6b1034 | 2005-11-08 04:06:41 -0600 | [diff] [blame] | 2628 | blen = srp->data.bufflen; |
| 2629 | usg = srp->data.k_use_sg; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2630 | seq_puts(s, srp->done ? |
| 2631 | ((1 == srp->done) ? "rcv:" : "fin:") |
| 2632 | : "act:"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2633 | seq_printf(s, " id=%d blen=%d", |
| 2634 | srp->header.pack_id, blen); |
| 2635 | if (srp->done) |
| 2636 | seq_printf(s, " dur=%d", hp->duration); |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 2637 | else { |
| 2638 | ms = jiffies_to_msecs(jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2639 | seq_printf(s, " t_o/elap=%d/%d", |
| cb59e84 | 2005-04-02 13:51:23 -0600 | [diff] [blame] | 2640 | (new_interface ? hp->timeout : |
| 2641 | jiffies_to_msecs(fp->timeout)), |
| 2642 | (ms > hp->duration ? ms - hp->duration : 0)); |
| 2643 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2644 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
| 2645 | (int) srp->data.cmd_opcode); |
| 2646 | } |
| 2647 | if (0 == m) |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2648 | seq_puts(s, " No requests active\n"); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2649 | read_unlock(&fp->rq_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2650 | } |
| 2651 | } |
| 2652 | |
| 2653 | static int sg_proc_open_debug(struct inode *inode, struct file *file) |
| 2654 | { |
| 2655 | return seq_open(file, &debug_seq_ops); |
| 2656 | } |
| 2657 | |
| 2658 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) |
| 2659 | { |
| 2660 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; |
| 2661 | Sg_device *sdp; |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2662 | unsigned long iflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2663 | |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2664 | if (it && (0 == it->index)) |
| 2665 | seq_printf(s, "max_active_device=%d def_reserved_size=%d\n", |
| 2666 | (int)it->max, sg_big_buff); |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2667 | |
| 2668 | read_lock_irqsave(&sg_index_lock, iflags); |
| 2669 | sdp = it ? sg_lookup_dev(it->index) : NULL; |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2670 | if (NULL == sdp) |
| 2671 | goto skip; |
| 2672 | read_lock(&sdp->sfd_lock); |
| 2673 | if (!list_empty(&sdp->sfds)) { |
James Bottomley | c0d3b9c | 2013-10-25 10:21:57 +0100 | [diff] [blame] | 2674 | seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2675 | if (atomic_read(&sdp->detaching)) |
| 2676 | seq_puts(s, "detaching pending close "); |
| 2677 | else if (sdp->device) { |
| 2678 | struct scsi_device *scsidp = sdp->device; |
| 2679 | |
Hannes Reinecke | 9cb78c1 | 2014-06-25 15:27:36 +0200 | [diff] [blame] | 2680 | seq_printf(s, "%d:%d:%d:%llu em=%d", |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2681 | scsidp->host->host_no, |
| 2682 | scsidp->channel, scsidp->id, |
| 2683 | scsidp->lun, |
| 2684 | scsidp->host->hostt->emulated); |
| 2685 | } |
| 2686 | seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n", |
| 2687 | sdp->sg_tablesize, sdp->exclude, sdp->open_cnt); |
James Bottomley | c0d3b9c | 2013-10-25 10:21:57 +0100 | [diff] [blame] | 2688 | sg_proc_debug_helper(s, sdp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2689 | } |
Douglas Gilbert | cc833ac | 2014-06-25 14:08:03 +0200 | [diff] [blame] | 2690 | read_unlock(&sdp->sfd_lock); |
| 2691 | skip: |
Tony Battersby | c6517b79 | 2009-01-21 14:45:50 -0500 | [diff] [blame] | 2692 | read_unlock_irqrestore(&sg_index_lock, iflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2693 | return 0; |
| 2694 | } |
| 2695 | |
| 2696 | #endif /* CONFIG_SCSI_PROC_FS */ |
| 2697 | |
| 2698 | module_init(init_sg); |
| 2699 | module_exit(exit_sg); |