Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _SCSI_SCSI_HOST_H |
| 2 | #define _SCSI_SCSI_HOST_H |
| 3 | |
| 4 | #include <linux/device.h> |
| 5 | #include <linux/list.h> |
| 6 | #include <linux/types.h> |
| 7 | #include <linux/workqueue.h> |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 8 | #include <linux/mutex.h> |
Al Viro | 0ffddfb | 2013-03-30 23:58:05 -0400 | [diff] [blame] | 9 | #include <linux/seq_file.h> |
Christoph Hellwig | d285203 | 2014-01-17 12:06:53 +0100 | [diff] [blame] | 10 | #include <linux/blk-mq.h> |
James Bottomley | 4660c8e | 2008-02-10 09:42:46 -0600 | [diff] [blame] | 11 | #include <scsi/scsi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 13 | struct request_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | struct block_device; |
Christoph Hellwig | 7dfdc9a | 2005-10-31 18:49:52 +0100 | [diff] [blame] | 15 | struct completion; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | struct module; |
| 17 | struct scsi_cmnd; |
| 18 | struct scsi_device; |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 19 | struct scsi_host_cmd_pool; |
James Bottomley | a283bd3 | 2005-05-24 12:06:38 -0500 | [diff] [blame] | 20 | struct scsi_target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | struct Scsi_Host; |
| 22 | struct scsi_host_cmd_pool; |
| 23 | struct scsi_transport_template; |
James Bottomley | 86e33a2 | 2006-08-30 09:45:51 -0400 | [diff] [blame] | 24 | struct blk_queue_tags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | |
| 27 | /* |
| 28 | * The various choices mean: |
| 29 | * NONE: Self evident. Host adapter is not capable of scatter-gather. |
| 30 | * ALL: Means that the host adapter module can do scatter-gather, |
| 31 | * and that there is no limit to the size of the table to which |
James Bottomley | 4660c8e | 2008-02-10 09:42:46 -0600 | [diff] [blame] | 32 | * we scatter/gather data. The value we set here is the maximum |
| 33 | * single element sglist. To use chained sglists, the adapter |
| 34 | * has to set a value beyond ALL (and correctly use the chain |
| 35 | * handling API. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | * Anything else: Indicates the maximum number of chains that can be |
| 37 | * used in one scatter-gather request. |
| 38 | */ |
| 39 | #define SG_NONE 0 |
James Bottomley | 4660c8e | 2008-02-10 09:42:46 -0600 | [diff] [blame] | 40 | #define SG_ALL SCSI_MAX_SG_SEGMENTS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
FUJITA Tomonori | 5dc2b89 | 2007-09-01 02:02:20 +0900 | [diff] [blame] | 42 | #define MODE_UNKNOWN 0x00 |
| 43 | #define MODE_INITIATOR 0x01 |
| 44 | #define MODE_TARGET 0x02 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | #define DISABLE_CLUSTERING 0 |
| 47 | #define ENABLE_CLUSTERING 1 |
| 48 | |
Mike Christie | e881a17 | 2009-10-15 17:46:39 -0700 | [diff] [blame] | 49 | enum { |
| 50 | SCSI_QDEPTH_DEFAULT, /* default requested change, e.g. from sysfs */ |
| 51 | SCSI_QDEPTH_QFULL, /* scsi-ml requested due to queue full */ |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 52 | SCSI_QDEPTH_RAMP_UP, /* scsi-ml requested due to threshold event */ |
Mike Christie | e881a17 | 2009-10-15 17:46:39 -0700 | [diff] [blame] | 53 | }; |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | struct scsi_host_template { |
| 56 | struct module *module; |
| 57 | const char *name; |
| 58 | |
| 59 | /* |
| 60 | * Used to initialize old-style drivers. For new-style drivers |
| 61 | * just perform all work in your module initialization function. |
| 62 | * |
| 63 | * Status: OBSOLETE |
| 64 | */ |
| 65 | int (* detect)(struct scsi_host_template *); |
| 66 | |
| 67 | /* |
| 68 | * Used as unload callback for hosts with old-style drivers. |
| 69 | * |
| 70 | * Status: OBSOLETE |
| 71 | */ |
| 72 | int (* release)(struct Scsi_Host *); |
| 73 | |
| 74 | /* |
| 75 | * The info function will return whatever useful information the |
| 76 | * developer sees fit. If not provided, then the name field will |
| 77 | * be used instead. |
| 78 | * |
| 79 | * Status: OPTIONAL |
| 80 | */ |
| 81 | const char *(* info)(struct Scsi_Host *); |
| 82 | |
| 83 | /* |
| 84 | * Ioctl interface |
| 85 | * |
| 86 | * Status: OPTIONAL |
| 87 | */ |
| 88 | int (* ioctl)(struct scsi_device *dev, int cmd, void __user *arg); |
| 89 | |
| 90 | |
| 91 | #ifdef CONFIG_COMPAT |
| 92 | /* |
| 93 | * Compat handler. Handle 32bit ABI. |
| 94 | * When unknown ioctl is passed return -ENOIOCTLCMD. |
| 95 | * |
| 96 | * Status: OPTIONAL |
| 97 | */ |
| 98 | int (* compat_ioctl)(struct scsi_device *dev, int cmd, void __user *arg); |
| 99 | #endif |
| 100 | |
| 101 | /* |
| 102 | * The queuecommand function is used to queue up a scsi |
| 103 | * command block to the LLDD. When the driver finished |
| 104 | * processing the command the done callback is invoked. |
| 105 | * |
| 106 | * If queuecommand returns 0, then the HBA has accepted the |
| 107 | * command. The done() function must be called on the command |
| 108 | * when the driver has finished with it. (you may call done on the |
| 109 | * command before queuecommand returns, but in this case you |
| 110 | * *must* return 0 from queuecommand). |
| 111 | * |
| 112 | * Queuecommand may also reject the command, in which case it may |
| 113 | * not touch the command and must not call done() for it. |
| 114 | * |
| 115 | * There are two possible rejection returns: |
| 116 | * |
| 117 | * SCSI_MLQUEUE_DEVICE_BUSY: Block this device temporarily, but |
| 118 | * allow commands to other devices serviced by this host. |
| 119 | * |
| 120 | * SCSI_MLQUEUE_HOST_BUSY: Block all devices served by this |
| 121 | * host temporarily. |
| 122 | * |
| 123 | * For compatibility, any other non-zero return is treated the |
| 124 | * same as SCSI_MLQUEUE_HOST_BUSY. |
| 125 | * |
| 126 | * NOTE: "temporarily" means either until the next command for# |
| 127 | * this device/host completes, or a period of time determined by |
| 128 | * I/O pressure in the system if there are no other outstanding |
| 129 | * commands. |
| 130 | * |
| 131 | * STATUS: REQUIRED |
| 132 | */ |
Jeff Garzik | f281233 | 2010-11-16 02:10:29 -0500 | [diff] [blame] | 133 | int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | /* |
| 136 | * This is an error handling strategy routine. You don't need to |
| 137 | * define one of these if you don't want to - there is a default |
| 138 | * routine that is present that should work in most cases. For those |
| 139 | * driver authors that have the inclination and ability to write their |
| 140 | * own strategy routine, this is where it is specified. Note - the |
| 141 | * strategy routine is *ALWAYS* run in the context of the kernel eh |
| 142 | * thread. Thus you are guaranteed to *NOT* be in an interrupt |
| 143 | * handler when you execute this, and you are also guaranteed to |
| 144 | * *NOT* have any other commands being queued while you are in the |
| 145 | * strategy routine. When you return from this function, operations |
| 146 | * return to normal. |
| 147 | * |
| 148 | * See scsi_error.c scsi_unjam_host for additional comments about |
| 149 | * what this function should and should not be attempting to do. |
| 150 | * |
| 151 | * Status: REQUIRED (at least one of them) |
| 152 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | int (* eh_abort_handler)(struct scsi_cmnd *); |
| 154 | int (* eh_device_reset_handler)(struct scsi_cmnd *); |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 155 | int (* eh_target_reset_handler)(struct scsi_cmnd *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | int (* eh_bus_reset_handler)(struct scsi_cmnd *); |
| 157 | int (* eh_host_reset_handler)(struct scsi_cmnd *); |
| 158 | |
| 159 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | * Before the mid layer attempts to scan for a new device where none |
| 161 | * currently exists, it will call this entry in your driver. Should |
| 162 | * your driver need to allocate any structs or perform any other init |
| 163 | * items in order to send commands to a currently unused target/lun |
| 164 | * combo, then this is where you can perform those allocations. This |
| 165 | * is specifically so that drivers won't have to perform any kind of |
| 166 | * "is this a new device" checks in their queuecommand routine, |
| 167 | * thereby making the hot path a bit quicker. |
| 168 | * |
| 169 | * Return values: 0 on success, non-0 on failure |
| 170 | * |
| 171 | * Deallocation: If we didn't find any devices at this ID, you will |
| 172 | * get an immediate call to slave_destroy(). If we find something |
| 173 | * here then you will get a call to slave_configure(), then the |
| 174 | * device will be used for however long it is kept around, then when |
| 175 | * the device is removed from the system (or * possibly at reboot |
| 176 | * time), you will then get a call to slave_destroy(). This is |
| 177 | * assuming you implement slave_configure and slave_destroy. |
| 178 | * However, if you allocate memory and hang it off the device struct, |
| 179 | * then you must implement the slave_destroy() routine at a minimum |
| 180 | * in order to avoid leaking memory |
| 181 | * each time a device is tore down. |
| 182 | * |
| 183 | * Status: OPTIONAL |
| 184 | */ |
| 185 | int (* slave_alloc)(struct scsi_device *); |
| 186 | |
| 187 | /* |
| 188 | * Once the device has responded to an INQUIRY and we know the |
| 189 | * device is online, we call into the low level driver with the |
| 190 | * struct scsi_device *. If the low level device driver implements |
| 191 | * this function, it *must* perform the task of setting the queue |
| 192 | * depth on the device. All other tasks are optional and depend |
| 193 | * on what the driver supports and various implementation details. |
| 194 | * |
| 195 | * Things currently recommended to be handled at this time include: |
| 196 | * |
| 197 | * 1. Setting the device queue depth. Proper setting of this is |
| 198 | * described in the comments for scsi_adjust_queue_depth. |
| 199 | * 2. Determining if the device supports the various synchronous |
| 200 | * negotiation protocols. The device struct will already have |
| 201 | * responded to INQUIRY and the results of the standard items |
| 202 | * will have been shoved into the various device flag bits, eg. |
| 203 | * device->sdtr will be true if the device supports SDTR messages. |
| 204 | * 3. Allocating command structs that the device will need. |
| 205 | * 4. Setting the default timeout on this device (if needed). |
| 206 | * 5. Anything else the low level driver might want to do on a device |
| 207 | * specific setup basis... |
| 208 | * 6. Return 0 on success, non-0 on error. The device will be marked |
| 209 | * as offline on error so that no access will occur. If you return |
| 210 | * non-0, your slave_destroy routine will never get called for this |
| 211 | * device, so don't leave any loose memory hanging around, clean |
| 212 | * up after yourself before returning non-0 |
| 213 | * |
| 214 | * Status: OPTIONAL |
| 215 | */ |
| 216 | int (* slave_configure)(struct scsi_device *); |
| 217 | |
| 218 | /* |
| 219 | * Immediately prior to deallocating the device and after all activity |
| 220 | * has ceased the mid layer calls this point so that the low level |
| 221 | * driver may completely detach itself from the scsi device and vice |
| 222 | * versa. The low level driver is responsible for freeing any memory |
| 223 | * it allocated in the slave_alloc or slave_configure calls. |
| 224 | * |
| 225 | * Status: OPTIONAL |
| 226 | */ |
| 227 | void (* slave_destroy)(struct scsi_device *); |
| 228 | |
| 229 | /* |
James Bottomley | a283bd3 | 2005-05-24 12:06:38 -0500 | [diff] [blame] | 230 | * Before the mid layer attempts to scan for a new device attached |
| 231 | * to a target where no target currently exists, it will call this |
| 232 | * entry in your driver. Should your driver need to allocate any |
| 233 | * structs or perform any other init items in order to send commands |
| 234 | * to a currently unused target, then this is where you can perform |
| 235 | * those allocations. |
| 236 | * |
| 237 | * Return values: 0 on success, non-0 on failure |
| 238 | * |
| 239 | * Status: OPTIONAL |
| 240 | */ |
| 241 | int (* target_alloc)(struct scsi_target *); |
| 242 | |
| 243 | /* |
| 244 | * Immediately prior to deallocating the target structure, and |
| 245 | * after all activity to attached scsi devices has ceased, the |
| 246 | * midlayer calls this point so that the driver may deallocate |
| 247 | * and terminate any references to the target. |
| 248 | * |
| 249 | * Status: OPTIONAL |
| 250 | */ |
| 251 | void (* target_destroy)(struct scsi_target *); |
| 252 | |
| 253 | /* |
Matthew Wilcox | 1aa8fab | 2006-11-22 13:24:54 -0700 | [diff] [blame] | 254 | * If a host has the ability to discover targets on its own instead |
| 255 | * of scanning the entire bus, it can fill in this function and |
| 256 | * call scsi_scan_host(). This function will be called periodically |
| 257 | * until it returns 1 with the scsi_host and the elapsed time of |
| 258 | * the scan in jiffies. |
| 259 | * |
| 260 | * Status: OPTIONAL |
| 261 | */ |
| 262 | int (* scan_finished)(struct Scsi_Host *, unsigned long); |
| 263 | |
| 264 | /* |
| 265 | * If the host wants to be called before the scan starts, but |
| 266 | * after the midlayer has set up ready for the scan, it can fill |
| 267 | * in this function. |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 268 | * |
| 269 | * Status: OPTIONAL |
Matthew Wilcox | 1aa8fab | 2006-11-22 13:24:54 -0700 | [diff] [blame] | 270 | */ |
| 271 | void (* scan_start)(struct Scsi_Host *); |
| 272 | |
| 273 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 274 | * Fill in this function to allow the queue depth of this host |
| 275 | * to be changeable (on a per device basis). Returns either |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | * the current queue depth setting (may be different from what |
| 277 | * was passed in) or an error. An error should only be |
| 278 | * returned if the requested depth is legal but the driver was |
| 279 | * unable to set it. If the requested depth is illegal, the |
| 280 | * driver should set and return the closest legal queue depth. |
| 281 | * |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 282 | * Status: OPTIONAL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | */ |
Mike Christie | e881a17 | 2009-10-15 17:46:39 -0700 | [diff] [blame] | 284 | int (* change_queue_depth)(struct scsi_device *, int, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 287 | * Fill in this function to allow the changing of tag types |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | * (this also allows the enabling/disabling of tag command |
| 289 | * queueing). An error should only be returned if something |
| 290 | * went wrong in the driver while trying to set the tag type. |
| 291 | * If the driver doesn't support the requested tag type, then |
| 292 | * it should set the closest type it does support without |
| 293 | * returning an error. Returns the actual tag type set. |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 294 | * |
| 295 | * Status: OPTIONAL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | */ |
| 297 | int (* change_queue_type)(struct scsi_device *, int); |
| 298 | |
| 299 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 300 | * This function determines the BIOS parameters for a given |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | * harddisk. These tend to be numbers that are made up by |
| 302 | * the host adapter. Parameters: |
| 303 | * size, device, list (heads, sectors, cylinders) |
| 304 | * |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 305 | * Status: OPTIONAL |
| 306 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | int (* bios_param)(struct scsi_device *, struct block_device *, |
| 308 | sector_t, int []); |
| 309 | |
| 310 | /* |
Tejun Heo | 72ec24b | 2010-05-15 20:09:32 +0200 | [diff] [blame] | 311 | * This function is called when one or more partitions on the |
| 312 | * device reach beyond the end of the device. |
| 313 | * |
| 314 | * Status: OPTIONAL |
| 315 | */ |
| 316 | void (*unlock_native_capacity)(struct scsi_device *); |
| 317 | |
| 318 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | * Can be used to export driver statistics and other infos to the |
| 320 | * world outside the kernel ie. userspace and it also provides an |
| 321 | * interface to feed the driver with information. |
| 322 | * |
| 323 | * Status: OBSOLETE |
| 324 | */ |
Al Viro | 0ffddfb | 2013-03-30 23:58:05 -0400 | [diff] [blame] | 325 | int (*show_info)(struct seq_file *, struct Scsi_Host *); |
| 326 | int (*write_info)(struct Scsi_Host *, char *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
| 328 | /* |
James Bottomley | 6c5f8ce | 2007-03-16 17:44:41 -0500 | [diff] [blame] | 329 | * This is an optional routine that allows the transport to become |
| 330 | * involved when a scsi io timer fires. The return value tells the |
| 331 | * timer routine how to finish the io timeout handling: |
| 332 | * EH_HANDLED: I fixed the error, please complete the command |
| 333 | * EH_RESET_TIMER: I need more time, reset the timer and |
| 334 | * begin counting again |
| 335 | * EH_NOT_HANDLED Begin normal error recovery |
| 336 | * |
| 337 | * Status: OPTIONAL |
| 338 | */ |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 339 | enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *); |
James Bottomley | 6c5f8ce | 2007-03-16 17:44:41 -0500 | [diff] [blame] | 340 | |
Vikas Chaudhary | 2944369 | 2011-08-12 02:51:28 -0700 | [diff] [blame] | 341 | /* This is an optional routine that allows transport to initiate |
| 342 | * LLD adapter or firmware reset using sysfs attribute. |
| 343 | * |
| 344 | * Return values: 0 on success, -ve value on failure. |
| 345 | * |
| 346 | * Status: OPTIONAL |
| 347 | */ |
| 348 | |
| 349 | int (*host_reset)(struct Scsi_Host *shost, int reset_type); |
| 350 | #define SCSI_ADAPTER_RESET 1 |
| 351 | #define SCSI_FIRMWARE_RESET 2 |
| 352 | |
| 353 | |
James Bottomley | 6c5f8ce | 2007-03-16 17:44:41 -0500 | [diff] [blame] | 354 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | * Name of proc directory |
| 356 | */ |
Kristian Høgsberg | b02b6bc | 2007-05-09 19:23:12 -0400 | [diff] [blame] | 357 | const char *proc_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
| 359 | /* |
| 360 | * Used to store the procfs directory if a driver implements the |
Al Viro | 70ef457 | 2013-03-31 13:27:56 -0400 | [diff] [blame] | 361 | * show_info method. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | */ |
| 363 | struct proc_dir_entry *proc_dir; |
| 364 | |
| 365 | /* |
| 366 | * This determines if we will use a non-interrupt driven |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 367 | * or an interrupt driven scheme. It is set to the maximum number |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | * of simultaneous commands a given host adapter will accept. |
| 369 | */ |
| 370 | int can_queue; |
| 371 | |
| 372 | /* |
| 373 | * In many instances, especially where disconnect / reconnect are |
| 374 | * supported, our host also has an ID on the SCSI bus. If this is |
| 375 | * the case, then it must be reserved. Please set this_id to -1 if |
| 376 | * your setup is in single initiator mode, and the host lacks an |
| 377 | * ID. |
| 378 | */ |
| 379 | int this_id; |
| 380 | |
| 381 | /* |
| 382 | * This determines the degree to which the host adapter is capable |
| 383 | * of scatter-gather. |
| 384 | */ |
| 385 | unsigned short sg_tablesize; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 386 | unsigned short sg_prot_tablesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
| 388 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 389 | * Set this if the host adapter has limitations beside segment count. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | */ |
Akinobu Mita | 8ed5a4d | 2014-06-02 22:56:48 +0900 | [diff] [blame] | 391 | unsigned int max_sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
| 393 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 394 | * DMA scatter gather segment boundary limit. A segment crossing this |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | * boundary will be split in two. |
| 396 | */ |
| 397 | unsigned long dma_boundary; |
| 398 | |
| 399 | /* |
| 400 | * This specifies "machine infinity" for host templates which don't |
| 401 | * limit the transfer size. Note this limit represents an absolute |
| 402 | * maximum, and may be over the transfer limits allowed for |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 403 | * individual devices (e.g. 256 for SCSI-1). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | */ |
| 405 | #define SCSI_DEFAULT_MAX_SECTORS 1024 |
| 406 | |
| 407 | /* |
| 408 | * True if this host adapter can make good use of linked commands. |
| 409 | * This will allow more than one command to be queued to a given |
| 410 | * unit on a given host. Set this to the maximum number of command |
| 411 | * blocks to be provided for each device. Set this to 1 for one |
| 412 | * command block per lun, 2 for two, etc. Do not set this to 0. |
| 413 | * You should make sure that the host adapter will do the right thing |
| 414 | * before you try setting this above 1. |
| 415 | */ |
| 416 | short cmd_per_lun; |
| 417 | |
| 418 | /* |
| 419 | * present contains counter indicating how many boards of this |
| 420 | * type were found when we did the scan. |
| 421 | */ |
| 422 | unsigned char present; |
| 423 | |
| 424 | /* |
FUJITA Tomonori | 5dc2b89 | 2007-09-01 02:02:20 +0900 | [diff] [blame] | 425 | * This specifies the mode that a LLD supports. |
| 426 | */ |
| 427 | unsigned supported_mode:2; |
| 428 | |
| 429 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 430 | * True if this host adapter uses unchecked DMA onto an ISA bus. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | */ |
| 432 | unsigned unchecked_isa_dma:1; |
| 433 | |
| 434 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 435 | * True if this host adapter can make good use of clustering. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | * I originally thought that if the tablesize was large that it |
| 437 | * was a waste of CPU cycles to prepare a cluster list, but |
| 438 | * it works out that the Buslogic is faster if you use a smaller |
| 439 | * number of segments (i.e. use clustering). I guess it is |
| 440 | * inefficient. |
| 441 | */ |
| 442 | unsigned use_clustering:1; |
| 443 | |
| 444 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 445 | * True for emulated SCSI host adapters (e.g. ATAPI). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | */ |
| 447 | unsigned emulated:1; |
| 448 | |
| 449 | /* |
| 450 | * True if the low-level driver performs its own reset-settle delays. |
| 451 | */ |
| 452 | unsigned skip_settle_delay:1; |
| 453 | |
| 454 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 455 | * True if we are using ordered write support. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | unsigned ordered_tag:1; |
| 458 | |
Martin K. Petersen | 54b2b50 | 2013-10-23 06:25:40 -0400 | [diff] [blame] | 459 | /* True if the controller does not support WRITE SAME */ |
| 460 | unsigned no_write_same:1; |
| 461 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | /* |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 463 | * True if asynchronous aborts are not supported |
| 464 | */ |
| 465 | unsigned no_async_abort:1; |
| 466 | |
| 467 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 468 | * Countdown for host blocking with no commands outstanding. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | */ |
| 470 | unsigned int max_host_blocked; |
| 471 | |
| 472 | /* |
| 473 | * Default value for the blocking. If the queue is empty, |
| 474 | * host_blocked counts down in the request_fn until it restarts |
| 475 | * host operations as zero is reached. |
| 476 | * |
| 477 | * FIXME: This should probably be a value in the template |
| 478 | */ |
| 479 | #define SCSI_DEFAULT_HOST_BLOCKED 7 |
| 480 | |
| 481 | /* |
| 482 | * Pointer to the sysfs class properties for this host, NULL terminated. |
| 483 | */ |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 484 | struct device_attribute **shost_attrs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
| 486 | /* |
| 487 | * Pointer to the SCSI device properties for this host, NULL terminated. |
| 488 | */ |
| 489 | struct device_attribute **sdev_attrs; |
| 490 | |
| 491 | /* |
| 492 | * List of hosts per template. |
| 493 | * |
| 494 | * This is only for use by scsi_module.c for legacy templates. |
| 495 | * For these access to it is synchronized implicitly by |
| 496 | * module_init/module_exit. |
| 497 | */ |
| 498 | struct list_head legacy_hosts; |
James Smart | 9e4f5e2 | 2009-03-26 13:33:19 -0400 | [diff] [blame] | 499 | |
| 500 | /* |
| 501 | * Vendor Identifier associated with the host |
| 502 | * |
| 503 | * Note: When specifying vendor_id, be sure to read the |
| 504 | * Vendor Type and ID formatting requirements specified in |
| 505 | * scsi_netlink.h |
| 506 | */ |
| 507 | u64 vendor_id; |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 508 | |
| 509 | /* |
| 510 | * Additional per-command data allocated for the driver. |
| 511 | */ |
| 512 | unsigned int cmd_size; |
| 513 | struct scsi_host_cmd_pool *cmd_pool; |
Christoph Hellwig | d285203 | 2014-01-17 12:06:53 +0100 | [diff] [blame] | 514 | |
| 515 | /* temporary flag to disable blk-mq I/O path */ |
| 516 | bool disable_blk_mq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | }; |
| 518 | |
| 519 | /* |
Jeff Garzik | f281233 | 2010-11-16 02:10:29 -0500 | [diff] [blame] | 520 | * Temporary #define for host lock push down. Can be removed when all |
| 521 | * drivers have been updated to take advantage of unlocked |
| 522 | * queuecommand. |
| 523 | * |
| 524 | */ |
| 525 | #define DEF_SCSI_QCMD(func_name) \ |
| 526 | int func_name(struct Scsi_Host *shost, struct scsi_cmnd *cmd) \ |
| 527 | { \ |
| 528 | unsigned long irq_flags; \ |
| 529 | int rc; \ |
| 530 | spin_lock_irqsave(shost->host_lock, irq_flags); \ |
| 531 | scsi_cmd_get_serial(shost, cmd); \ |
| 532 | rc = func_name##_lck (cmd, cmd->scsi_done); \ |
| 533 | spin_unlock_irqrestore(shost->host_lock, irq_flags); \ |
| 534 | return rc; \ |
| 535 | } |
| 536 | |
| 537 | |
| 538 | /* |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 539 | * shost state: If you alter this, you also need to alter scsi_sysfs.c |
| 540 | * (for the ascii descriptions) and the state model enforcer: |
| 541 | * scsi_host_set_state() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | */ |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 543 | enum scsi_host_state { |
| 544 | SHOST_CREATED = 1, |
| 545 | SHOST_RUNNING, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | SHOST_CANCEL, |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 547 | SHOST_DEL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | SHOST_RECOVERY, |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 549 | SHOST_CANCEL_RECOVERY, |
| 550 | SHOST_DEL_RECOVERY, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | }; |
| 552 | |
| 553 | struct Scsi_Host { |
| 554 | /* |
| 555 | * __devices is protected by the host_lock, but you should |
| 556 | * usually use scsi_device_lookup / shost_for_each_device |
| 557 | * to access it and don't care about locking yourself. |
| 558 | * In the rare case of beeing in irq context you can use |
| 559 | * their __ prefixed variants with the lock held. NEVER |
| 560 | * access this list directly from a driver. |
| 561 | */ |
| 562 | struct list_head __devices; |
| 563 | struct list_head __targets; |
| 564 | |
| 565 | struct scsi_host_cmd_pool *cmd_pool; |
| 566 | spinlock_t free_list_lock; |
| 567 | struct list_head free_list; /* backup store of cmd structs */ |
| 568 | struct list_head starved_list; |
| 569 | |
| 570 | spinlock_t default_lock; |
| 571 | spinlock_t *host_lock; |
| 572 | |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 573 | struct mutex scan_mutex;/* serialize scanning activity */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | |
| 575 | struct list_head eh_cmd_q; |
| 576 | struct task_struct * ehandler; /* Error recovery thread. */ |
Christoph Hellwig | 7dfdc9a | 2005-10-31 18:49:52 +0100 | [diff] [blame] | 577 | struct completion * eh_action; /* Wait for specific actions on the |
| 578 | host. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | wait_queue_head_t host_wait; |
| 580 | struct scsi_host_template *hostt; |
| 581 | struct scsi_transport_template *transportt; |
| 06f81ea | 2005-04-17 14:57:29 -0500 | [diff] [blame] | 582 | |
| 583 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 584 | * Area to keep a shared tag map (if needed, will be |
| 585 | * NULL if not). |
James Bottomley | 86e33a2 | 2006-08-30 09:45:51 -0400 | [diff] [blame] | 586 | */ |
Christoph Hellwig | d285203 | 2014-01-17 12:06:53 +0100 | [diff] [blame] | 587 | union { |
| 588 | struct blk_queue_tag *bqt; |
| 589 | struct blk_mq_tag_set tag_set; |
| 590 | }; |
James Bottomley | 86e33a2 | 2006-08-30 09:45:51 -0400 | [diff] [blame] | 591 | |
Christoph Hellwig | 7466501 | 2014-01-22 15:29:29 +0100 | [diff] [blame] | 592 | atomic_t host_busy; /* commands actually active on low-level */ |
Christoph Hellwig | cd9070c | 2014-01-23 12:07:41 +0100 | [diff] [blame] | 593 | atomic_t host_blocked; |
| 594 | |
Christoph Hellwig | 7466501 | 2014-01-22 15:29:29 +0100 | [diff] [blame] | 595 | unsigned int host_failed; /* commands that failed. |
| 596 | protected by host_lock */ |
Tejun Heo | ee7863b | 2006-05-15 20:57:20 +0900 | [diff] [blame] | 597 | unsigned int host_eh_scheduled; /* EH scheduled without command */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
Matthew Wilcox | 6d49f63 | 2008-07-15 14:54:16 -0600 | [diff] [blame] | 599 | unsigned int host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 601 | /* next two fields are used to bound the time spent in error handling */ |
| 602 | int eh_deadline; |
| 603 | unsigned long last_reset; |
| 604 | |
| 605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | /* |
| 607 | * These three parameters can be used to allow for wide scsi, |
| 608 | * and for host adapters that support multiple busses |
Sebastian Herbszt | 8e4a5da | 2014-09-20 13:37:55 +0200 | [diff] [blame] | 609 | * The last two should be set to 1 more than the actual max id |
Hannes Reinecke | 1abf635 | 2014-06-25 15:27:38 +0200 | [diff] [blame] | 610 | * or lun (e.g. 8 for SCSI parallel systems). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | unsigned int max_channel; |
Hannes Reinecke | 1abf635 | 2014-06-25 15:27:38 +0200 | [diff] [blame] | 613 | unsigned int max_id; |
| 614 | u64 max_lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
| 616 | /* |
| 617 | * This is a unique identifier that must be assigned so that we |
| 618 | * have some way of identifying each detected host adapter properly |
| 619 | * and uniquely. For hosts that do not support more than one card |
| 620 | * in the system at one time, this does not need to be set. It is |
| 621 | * initialized to 0 in scsi_register. |
| 622 | */ |
| 623 | unsigned int unique_id; |
| 624 | |
| 625 | /* |
| 626 | * The maximum length of SCSI commands that this host can accept. |
| 627 | * Probably 12 for most host adapters, but could be 16 for others. |
Boaz Harrosh | db4742d | 2008-04-30 11:27:26 +0300 | [diff] [blame] | 628 | * or 260 if the driver supports variable length cdbs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | * For drivers that don't set this field, a value of 12 is |
Boaz Harrosh | db4742d | 2008-04-30 11:27:26 +0300 | [diff] [blame] | 630 | * assumed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | */ |
Boaz Harrosh | db4742d | 2008-04-30 11:27:26 +0300 | [diff] [blame] | 632 | unsigned short max_cmd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
| 634 | int this_id; |
| 635 | int can_queue; |
| 636 | short cmd_per_lun; |
| 637 | short unsigned int sg_tablesize; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 638 | short unsigned int sg_prot_tablesize; |
Akinobu Mita | 8ed5a4d | 2014-06-02 22:56:48 +0900 | [diff] [blame] | 639 | unsigned int max_sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | unsigned long dma_boundary; |
| 641 | /* |
| 642 | * Used to assign serial numbers to the cmds. |
| 643 | * Protected by the host lock. |
| 644 | */ |
Matthew Wilcox | 12a4416 | 2007-09-18 19:54:43 -0600 | [diff] [blame] | 645 | unsigned long cmd_serial_number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | |
FUJITA Tomonori | 5dc2b89 | 2007-09-01 02:02:20 +0900 | [diff] [blame] | 647 | unsigned active_mode:2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | unsigned unchecked_isa_dma:1; |
| 649 | unsigned use_clustering:1; |
| 650 | unsigned use_blk_tcq:1; |
| 651 | |
| 652 | /* |
| 653 | * Host has requested that no further requests come through for the |
| 654 | * time being. |
| 655 | */ |
| 656 | unsigned host_self_blocked:1; |
| 657 | |
| 658 | /* |
| 659 | * Host uses correct SCSI ordering not PC ordering. The bit is |
| 660 | * set for the minority of drivers whose authors actually read |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 661 | * the spec ;). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | */ |
| 663 | unsigned reverse_ordering:1; |
| 664 | |
| 665 | /* |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 666 | * Ordered write support |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | unsigned ordered_tag:1; |
| 669 | |
Pavel Machek | d850bd3 | 2008-02-04 23:53:24 -0800 | [diff] [blame] | 670 | /* Task mgmt function in progress */ |
James Smart | d7a1bb0 | 2006-03-08 14:50:12 -0500 | [diff] [blame] | 671 | unsigned tmf_in_progress:1; |
| 672 | |
Matthew Wilcox | 3e082a9 | 2006-09-28 15:19:20 -0600 | [diff] [blame] | 673 | /* Asynchronous scan in progress */ |
| 674 | unsigned async_scan:1; |
| 675 | |
Lin Ming | ae0751f | 2011-12-05 09:20:24 +0800 | [diff] [blame] | 676 | /* Don't resume host in EH */ |
| 677 | unsigned eh_noresume:1; |
| 678 | |
Martin K. Petersen | 54b2b50 | 2013-10-23 06:25:40 -0400 | [diff] [blame] | 679 | /* The controller does not support WRITE SAME */ |
| 680 | unsigned no_write_same:1; |
| 681 | |
Christoph Hellwig | d285203 | 2014-01-17 12:06:53 +0100 | [diff] [blame] | 682 | unsigned use_blk_mq:1; |
Kashyap.Desai@avagotech.com | 64bdcbc | 2014-08-20 19:24:33 +0530 | [diff] [blame] | 683 | unsigned use_cmd_list:1; |
Christoph Hellwig | d285203 | 2014-01-17 12:06:53 +0100 | [diff] [blame] | 684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | /* |
| 686 | * Optional work queue to be utilized by the transport |
| 687 | */ |
Kay Sievers | aab0de2 | 2008-05-02 06:02:41 +0200 | [diff] [blame] | 688 | char work_q_name[20]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | struct workqueue_struct *work_q; |
| 690 | |
| 691 | /* |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 692 | * Task management function work queue |
| 693 | */ |
| 694 | struct workqueue_struct *tmf_work_q; |
| 695 | |
Alan Stern | 50c4e96 | 2014-09-02 11:35:50 -0400 | [diff] [blame] | 696 | /* The transport requires the LUN bits NOT to be stored in CDB[1] */ |
| 697 | unsigned no_scsi2_lun_in_cdb:1; |
| 698 | |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 699 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | * Value host_blocked counts down from |
| 701 | */ |
| 702 | unsigned int max_host_blocked; |
| 703 | |
Martin K. Petersen | 4469f98 | 2008-07-17 04:28:30 -0400 | [diff] [blame] | 704 | /* Protection Information */ |
| 705 | unsigned int prot_capabilities; |
| 706 | unsigned char prot_guard_type; |
| 707 | |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 708 | /* |
| 709 | * q used for scsi_tgt msgs, async events or any other requests that |
| 710 | * need to be processed in userspace |
| 711 | */ |
| 712 | struct request_queue *uspace_req_q; |
| 713 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | /* legacy crap */ |
| 715 | unsigned long base; |
| 716 | unsigned long io_port; |
| 717 | unsigned char n_io_port; |
| 718 | unsigned char dma_channel; |
| 719 | unsigned int irq; |
| 720 | |
| 721 | |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 722 | enum scsi_host_state shost_state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | /* ldm bits */ |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 725 | struct device shost_gendev, shost_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
| 727 | /* |
| 728 | * List of hosts per template. |
| 729 | * |
| 730 | * This is only for use by scsi_module.c for legacy templates. |
| 731 | * For these access to it is synchronized implicitly by |
| 732 | * module_init/module_exit. |
| 733 | */ |
| 734 | struct list_head sht_legacy_list; |
| 735 | |
| 736 | /* |
| 737 | * Points to the transport data (if any) which is allocated |
| 738 | * separately |
| 739 | */ |
| 740 | void *shost_data; |
| 741 | |
| 742 | /* |
James Bottomley | d139b9b | 2009-11-05 13:33:12 -0600 | [diff] [blame] | 743 | * Points to the physical bus device we'd use to do DMA |
| 744 | * Needed just in case we have virtual hosts. |
| 745 | */ |
| 746 | struct device *dma_dev; |
| 747 | |
| 748 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | * We should ensure that this is aligned, both for better performance |
| 750 | * and also because some compilers (m68k) don't automatically force |
| 751 | * alignment to a long boundary. |
| 752 | */ |
| 753 | unsigned long hostdata[0] /* Used for storage of host specific stuff */ |
| 754 | __attribute__ ((aligned (sizeof(unsigned long)))); |
| 755 | }; |
| 756 | |
| 757 | #define class_to_shost(d) \ |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 758 | container_of(d, struct Scsi_Host, shost_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
James Bottomley | 9ccfc75 | 2005-10-02 11:45:08 -0500 | [diff] [blame] | 760 | #define shost_printk(prefix, shost, fmt, a...) \ |
| 761 | dev_printk(prefix, &(shost)->shost_gendev, fmt, ##a) |
| 762 | |
Christoph Hellwig | bcd92c9 | 2007-05-31 20:12:26 +0200 | [diff] [blame] | 763 | static inline void *shost_priv(struct Scsi_Host *shost) |
| 764 | { |
| 765 | return (void *)shost->hostdata; |
| 766 | } |
James Bottomley | 9ccfc75 | 2005-10-02 11:45:08 -0500 | [diff] [blame] | 767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | int scsi_is_host_device(const struct device *); |
| 769 | |
| 770 | static inline struct Scsi_Host *dev_to_shost(struct device *dev) |
| 771 | { |
| 772 | while (!scsi_is_host_device(dev)) { |
| 773 | if (!dev->parent) |
| 774 | return NULL; |
| 775 | dev = dev->parent; |
| 776 | } |
| 777 | return container_of(dev, struct Scsi_Host, shost_gendev); |
| 778 | } |
| 779 | |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 780 | static inline int scsi_host_in_recovery(struct Scsi_Host *shost) |
| 781 | { |
| 782 | return shost->shost_state == SHOST_RECOVERY || |
| 783 | shost->shost_state == SHOST_CANCEL_RECOVERY || |
James Smart | d7a1bb0 | 2006-03-08 14:50:12 -0500 | [diff] [blame] | 784 | shost->shost_state == SHOST_DEL_RECOVERY || |
| 785 | shost->tmf_in_progress; |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 786 | } |
| 787 | |
Christoph Hellwig | d285203 | 2014-01-17 12:06:53 +0100 | [diff] [blame] | 788 | extern bool scsi_use_blk_mq; |
| 789 | |
| 790 | static inline bool shost_use_blk_mq(struct Scsi_Host *shost) |
| 791 | { |
| 792 | return shost->use_blk_mq; |
| 793 | } |
| 794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *); |
| 796 | extern void scsi_flush_work(struct Scsi_Host *); |
| 797 | |
| 798 | extern struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *, int); |
James Bottomley | d139b9b | 2009-11-05 13:33:12 -0600 | [diff] [blame] | 799 | extern int __must_check scsi_add_host_with_dma(struct Scsi_Host *, |
| 800 | struct device *, |
| 801 | struct device *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | extern void scsi_scan_host(struct Scsi_Host *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | extern void scsi_rescan_device(struct device *); |
| 804 | extern void scsi_remove_host(struct Scsi_Host *); |
| 805 | extern struct Scsi_Host *scsi_host_get(struct Scsi_Host *); |
| 806 | extern void scsi_host_put(struct Scsi_Host *t); |
| 807 | extern struct Scsi_Host *scsi_host_lookup(unsigned short); |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 808 | extern const char *scsi_host_state_name(enum scsi_host_state); |
Jeff Garzik | f281233 | 2010-11-16 02:10:29 -0500 | [diff] [blame] | 809 | extern void scsi_cmd_get_serial(struct Scsi_Host *, struct scsi_cmnd *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
James Bottomley | d139b9b | 2009-11-05 13:33:12 -0600 | [diff] [blame] | 811 | static inline int __must_check scsi_add_host(struct Scsi_Host *host, |
| 812 | struct device *dev) |
| 813 | { |
| 814 | return scsi_add_host_with_dma(host, dev, dev); |
| 815 | } |
| 816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | static inline struct device *scsi_get_device(struct Scsi_Host *shost) |
| 818 | { |
| 819 | return shost->shost_gendev.parent; |
| 820 | } |
| 821 | |
Mike Anderson | 82f2946 | 2005-06-16 11:14:33 -0700 | [diff] [blame] | 822 | /** |
| 823 | * scsi_host_scan_allowed - Is scanning of this host allowed |
| 824 | * @shost: Pointer to Scsi_Host. |
| 825 | **/ |
| 826 | static inline int scsi_host_scan_allowed(struct Scsi_Host *shost) |
| 827 | { |
Mike Christie | 76e4e12 | 2011-08-25 00:36:38 -0500 | [diff] [blame] | 828 | return shost->shost_state == SHOST_RUNNING || |
| 829 | shost->shost_state == SHOST_RECOVERY; |
Mike Anderson | 82f2946 | 2005-06-16 11:14:33 -0700 | [diff] [blame] | 830 | } |
| 831 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | extern void scsi_unblock_requests(struct Scsi_Host *); |
| 833 | extern void scsi_block_requests(struct Scsi_Host *); |
| 834 | |
| 835 | struct class_container; |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 836 | |
| 837 | extern struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost, |
| 838 | void (*) (struct request_queue *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | /* |
| 840 | * These two functions are used to allocate and free a pseudo device |
| 841 | * which will connect to the host adapter itself rather than any |
| 842 | * physical device. You must deallocate when you are done with the |
| 843 | * thing. This physical pseudo-device isn't real and won't be available |
| 844 | * from any high-level drivers. |
| 845 | */ |
| 846 | extern void scsi_free_host_dev(struct scsi_device *); |
| 847 | extern struct scsi_device *scsi_get_host_dev(struct Scsi_Host *); |
| 848 | |
Martin K. Petersen | 4469f98 | 2008-07-17 04:28:30 -0400 | [diff] [blame] | 849 | /* |
| 850 | * DIF defines the exchange of protection information between |
| 851 | * initiator and SBC block device. |
| 852 | * |
| 853 | * DIX defines the exchange of protection information between OS and |
| 854 | * initiator. |
| 855 | */ |
| 856 | enum scsi_host_prot_capabilities { |
| 857 | SHOST_DIF_TYPE1_PROTECTION = 1 << 0, /* T10 DIF Type 1 */ |
| 858 | SHOST_DIF_TYPE2_PROTECTION = 1 << 1, /* T10 DIF Type 2 */ |
| 859 | SHOST_DIF_TYPE3_PROTECTION = 1 << 2, /* T10 DIF Type 3 */ |
| 860 | |
| 861 | SHOST_DIX_TYPE0_PROTECTION = 1 << 3, /* DIX between OS and HBA only */ |
| 862 | SHOST_DIX_TYPE1_PROTECTION = 1 << 4, /* DIX with DIF Type 1 */ |
| 863 | SHOST_DIX_TYPE2_PROTECTION = 1 << 5, /* DIX with DIF Type 2 */ |
| 864 | SHOST_DIX_TYPE3_PROTECTION = 1 << 6, /* DIX with DIF Type 3 */ |
| 865 | }; |
| 866 | |
| 867 | /* |
| 868 | * SCSI hosts which support the Data Integrity Extensions must |
| 869 | * indicate their capabilities by setting the prot_capabilities using |
| 870 | * this call. |
| 871 | */ |
| 872 | static inline void scsi_host_set_prot(struct Scsi_Host *shost, unsigned int mask) |
| 873 | { |
| 874 | shost->prot_capabilities = mask; |
| 875 | } |
| 876 | |
| 877 | static inline unsigned int scsi_host_get_prot(struct Scsi_Host *shost) |
| 878 | { |
| 879 | return shost->prot_capabilities; |
| 880 | } |
| 881 | |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 882 | static inline int scsi_host_prot_dma(struct Scsi_Host *shost) |
| 883 | { |
| 884 | return shost->prot_capabilities >= SHOST_DIX_TYPE0_PROTECTION; |
| 885 | } |
| 886 | |
Martin K. Petersen | 4469f98 | 2008-07-17 04:28:30 -0400 | [diff] [blame] | 887 | static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsigned int target_type) |
| 888 | { |
Martin K. Petersen | b2b465e | 2009-10-29 22:32:26 -0400 | [diff] [blame] | 889 | static unsigned char cap[] = { 0, |
| 890 | SHOST_DIF_TYPE1_PROTECTION, |
| 891 | SHOST_DIF_TYPE2_PROTECTION, |
| 892 | SHOST_DIF_TYPE3_PROTECTION }; |
Martin K. Petersen | 4469f98 | 2008-07-17 04:28:30 -0400 | [diff] [blame] | 893 | |
Martin K. Petersen | 4d24834 | 2012-09-26 22:39:44 -0400 | [diff] [blame] | 894 | if (target_type >= ARRAY_SIZE(cap)) |
Martin K. Petersen | fe54239 | 2012-09-21 12:44:12 -0400 | [diff] [blame] | 895 | return 0; |
| 896 | |
Martin K. Petersen | b2b465e | 2009-10-29 22:32:26 -0400 | [diff] [blame] | 897 | return shost->prot_capabilities & cap[target_type] ? target_type : 0; |
Martin K. Petersen | 4469f98 | 2008-07-17 04:28:30 -0400 | [diff] [blame] | 898 | } |
| 899 | |
| 900 | static inline unsigned int scsi_host_dix_capable(struct Scsi_Host *shost, unsigned int target_type) |
| 901 | { |
Martin K. Petersen | 35e1a5d | 2009-09-18 17:33:00 -0400 | [diff] [blame] | 902 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
Martin K. Petersen | b2b465e | 2009-10-29 22:32:26 -0400 | [diff] [blame] | 903 | static unsigned char cap[] = { SHOST_DIX_TYPE0_PROTECTION, |
| 904 | SHOST_DIX_TYPE1_PROTECTION, |
| 905 | SHOST_DIX_TYPE2_PROTECTION, |
| 906 | SHOST_DIX_TYPE3_PROTECTION }; |
| 907 | |
Martin K. Petersen | 4d24834 | 2012-09-26 22:39:44 -0400 | [diff] [blame] | 908 | if (target_type >= ARRAY_SIZE(cap)) |
Martin K. Petersen | fe54239 | 2012-09-21 12:44:12 -0400 | [diff] [blame] | 909 | return 0; |
| 910 | |
Martin K. Petersen | b2b465e | 2009-10-29 22:32:26 -0400 | [diff] [blame] | 911 | return shost->prot_capabilities & cap[target_type]; |
Martin K. Petersen | 35e1a5d | 2009-09-18 17:33:00 -0400 | [diff] [blame] | 912 | #endif |
Martin K. Petersen | 4469f98 | 2008-07-17 04:28:30 -0400 | [diff] [blame] | 913 | return 0; |
| 914 | } |
| 915 | |
| 916 | /* |
| 917 | * All DIX-capable initiators must support the T10-mandated CRC |
| 918 | * checksum. Controllers can optionally implement the IP checksum |
| 919 | * scheme which has much lower impact on system performance. Note |
| 920 | * that the main rationale for the checksum is to match integrity |
| 921 | * metadata with data. Detecting bit errors are a job for ECC memory |
| 922 | * and buses. |
| 923 | */ |
| 924 | |
| 925 | enum scsi_host_guard_type { |
| 926 | SHOST_DIX_GUARD_CRC = 1 << 0, |
| 927 | SHOST_DIX_GUARD_IP = 1 << 1, |
| 928 | }; |
| 929 | |
| 930 | static inline void scsi_host_set_guard(struct Scsi_Host *shost, unsigned char type) |
| 931 | { |
| 932 | shost->prot_guard_type = type; |
| 933 | } |
| 934 | |
| 935 | static inline unsigned char scsi_host_get_guard(struct Scsi_Host *shost) |
| 936 | { |
| 937 | return shost->prot_guard_type; |
| 938 | } |
| 939 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | /* legacy interfaces */ |
| 941 | extern struct Scsi_Host *scsi_register(struct scsi_host_template *, int); |
| 942 | extern void scsi_unregister(struct Scsi_Host *); |
James Bottomley | 47ba39e | 2005-07-30 11:39:53 -0500 | [diff] [blame] | 943 | extern int scsi_host_set_state(struct Scsi_Host *, enum scsi_host_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
| 945 | #endif /* _SCSI_SCSI_HOST_H */ |