| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _SCSI_SCSI_HOST_H |
| #define _SCSI_SCSI_HOST_H |
| |
| #include <linux/device.h> |
| #include <linux/list.h> |
| #include <linux/types.h> |
| #include <linux/workqueue.h> |
| #include <linux/mutex.h> |
| #include <linux/seq_file.h> |
| #include <linux/blk-mq.h> |
| #include <scsi/scsi.h> |
| |
| struct block_device; |
| struct completion; |
| struct module; |
| struct scsi_cmnd; |
| struct scsi_device; |
| struct scsi_target; |
| struct Scsi_Host; |
| struct scsi_transport_template; |
| |
| |
| #define SG_ALL SG_CHUNK_SIZE |
| |
| #define MODE_UNKNOWN 0x00 |
| #define MODE_INITIATOR 0x01 |
| #define MODE_TARGET 0x02 |
| |
| /** |
| * enum scsi_timeout_action - How to handle a command that timed out. |
| * @SCSI_EH_DONE: The command has already been completed. |
| * @SCSI_EH_RESET_TIMER: Reset the timer and continue waiting for completion. |
| * @SCSI_EH_NOT_HANDLED: The command has not yet finished. Abort the command. |
| */ |
| enum scsi_timeout_action { |
| SCSI_EH_DONE, |
| SCSI_EH_RESET_TIMER, |
| SCSI_EH_NOT_HANDLED, |
| }; |
| |
| struct scsi_host_template { |
| /* |
| * Put fields referenced in IO submission path together in |
| * same cacheline |
| */ |
| |
| /* |
| * Additional per-command data allocated for the driver. |
| */ |
| unsigned int cmd_size; |
| |
| /* |
| * The queuecommand function is used to queue up a scsi |
| * command block to the LLDD. When the driver finished |
| * processing the command the done callback is invoked. |
| * |
| * If queuecommand returns 0, then the driver has accepted the |
| * command. It must also push it to the HBA if the scsi_cmnd |
| * flag SCMD_LAST is set, or if the driver does not implement |
| * commit_rqs. The done() function must be called on the command |
| * when the driver has finished with it. (you may call done on the |
| * command before queuecommand returns, but in this case you |
| * *must* return 0 from queuecommand). |
| * |
| * Queuecommand may also reject the command, in which case it may |
| * not touch the command and must not call done() for it. |
| * |
| * There are two possible rejection returns: |
| * |
| * SCSI_MLQUEUE_DEVICE_BUSY: Block this device temporarily, but |
| * allow commands to other devices serviced by this host. |
| * |
| * SCSI_MLQUEUE_HOST_BUSY: Block all devices served by this |
| * host temporarily. |
| * |
| * For compatibility, any other non-zero return is treated the |
| * same as SCSI_MLQUEUE_HOST_BUSY. |
| * |
| * NOTE: "temporarily" means either until the next command for# |
| * this device/host completes, or a period of time determined by |
| * I/O pressure in the system if there are no other outstanding |
| * commands. |
| * |
| * STATUS: REQUIRED |
| */ |
| int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *); |
| |
| /* |
| * The commit_rqs function is used to trigger a hardware |
| * doorbell after some requests have been queued with |
| * queuecommand, when an error is encountered before sending |
| * the request with SCMD_LAST set. |
| * |
| * STATUS: OPTIONAL |
| */ |
| void (*commit_rqs)(struct Scsi_Host *, u16); |
| |
| struct module *module; |
| const char *name; |
| |
| /* |
| * The info function will return whatever useful information the |
| * developer sees fit. If not provided, then the name field will |
| * be used instead. |
| * |
| * Status: OPTIONAL |
| */ |
| const char *(*info)(struct Scsi_Host *); |
| |
| /* |
| * Ioctl interface |
| * |
| * Status: OPTIONAL |
| */ |
| int (*ioctl)(struct scsi_device *dev, unsigned int cmd, |
| void __user *arg); |
| |
| |
| #ifdef CONFIG_COMPAT |
| /* |
| * Compat handler. Handle 32bit ABI. |
| * When unknown ioctl is passed return -ENOIOCTLCMD. |
| * |
| * Status: OPTIONAL |
| */ |
| int (*compat_ioctl)(struct scsi_device *dev, unsigned int cmd, |
| void __user *arg); |
| #endif |
| |
| int (*init_cmd_priv)(struct Scsi_Host *shost, struct scsi_cmnd *cmd); |
| int (*exit_cmd_priv)(struct Scsi_Host *shost, struct scsi_cmnd *cmd); |
| |
| /* |
| * This is an error handling strategy routine. You don't need to |
| * define one of these if you don't want to - there is a default |
| * routine that is present that should work in most cases. For those |
| * driver authors that have the inclination and ability to write their |
| * own strategy routine, this is where it is specified. Note - the |
| * strategy routine is *ALWAYS* run in the context of the kernel eh |
| * thread. Thus you are guaranteed to *NOT* be in an interrupt |
| * handler when you execute this, and you are also guaranteed to |
| * *NOT* have any other commands being queued while you are in the |
| * strategy routine. When you return from this function, operations |
| * return to normal. |
| * |
| * See scsi_error.c scsi_unjam_host for additional comments about |
| * what this function should and should not be attempting to do. |
| * |
| * Status: REQUIRED (at least one of them) |
| */ |
| int (* eh_abort_handler)(struct scsi_cmnd *); |
| int (* eh_device_reset_handler)(struct scsi_cmnd *); |
| int (* eh_target_reset_handler)(struct scsi_cmnd *); |
| int (* eh_bus_reset_handler)(struct scsi_cmnd *); |
| int (* eh_host_reset_handler)(struct scsi_cmnd *); |
| |
| /* |
| * Before the mid layer attempts to scan for a new device where none |
| * currently exists, it will call this entry in your driver. Should |
| * your driver need to allocate any structs or perform any other init |
| * items in order to send commands to a currently unused target/lun |
| * combo, then this is where you can perform those allocations. This |
| * is specifically so that drivers won't have to perform any kind of |
| * "is this a new device" checks in their queuecommand routine, |
| * thereby making the hot path a bit quicker. |
| * |
| * Return values: 0 on success, non-0 on failure |
| * |
| * Deallocation: If we didn't find any devices at this ID, you will |
| * get an immediate call to slave_destroy(). If we find something |
| * here then you will get a call to slave_configure(), then the |
| * device will be used for however long it is kept around, then when |
| * the device is removed from the system (or * possibly at reboot |
| * time), you will then get a call to slave_destroy(). This is |
| * assuming you implement slave_configure and slave_destroy. |
| * However, if you allocate memory and hang it off the device struct, |
| * then you must implement the slave_destroy() routine at a minimum |
| * in order to avoid leaking memory |
| * each time a device is tore down. |
| * |
| * Status: OPTIONAL |
| */ |
| int (* slave_alloc)(struct scsi_device *); |
| |
| /* |
| * Once the device has responded to an INQUIRY and we know the |
| * device is online, we call into the low level driver with the |
| * struct scsi_device *. If the low level device driver implements |
| * this function, it *must* perform the task of setting the queue |
| * depth on the device. All other tasks are optional and depend |
| * on what the driver supports and various implementation details. |
| * |
| * Things currently recommended to be handled at this time include: |
| * |
| * 1. Setting the device queue depth. Proper setting of this is |
| * described in the comments for scsi_change_queue_depth. |
| * 2. Determining if the device supports the various synchronous |
| * negotiation protocols. The device struct will already have |
| * responded to INQUIRY and the results of the standard items |
| * will have been shoved into the various device flag bits, eg. |
| * device->sdtr will be true if the device supports SDTR messages. |
| * 3. Allocating command structs that the device will need. |
| * 4. Setting the default timeout on this device (if needed). |
| * 5. Anything else the low level driver might want to do on a device |
| * specific setup basis... |
| * 6. Return 0 on success, non-0 on error. The device will be marked |
| * as offline on error so that no access will occur. If you return |
| * non-0, your slave_destroy routine will never get called for this |
| * device, so don't leave any loose memory hanging around, clean |
| * up after yourself before returning non-0 |
| * |
| * Status: OPTIONAL |
| */ |
| int (* slave_configure)(struct scsi_device *); |
| |
| /* |
| * Immediately prior to deallocating the device and after all activity |
| * has ceased the mid layer calls this point so that the low level |
| * driver may completely detach itself from the scsi device and vice |
| * versa. The low level driver is responsible for freeing any memory |
| * it allocated in the slave_alloc or slave_configure calls. |
| * |
| * Status: OPTIONAL |
| */ |
| void (* slave_destroy)(struct scsi_device *); |
| |
| /* |
| * Before the mid layer attempts to scan for a new device attached |
| * to a target where no target currently exists, it will call this |
| * entry in your driver. Should your driver need to allocate any |
| * structs or perform any other init items in order to send commands |
| * to a currently unused target, then this is where you can perform |
| * those allocations. |
| * |
| * Return values: 0 on success, non-0 on failure |
| * |
| * Status: OPTIONAL |
| */ |
| int (* target_alloc)(struct scsi_target *); |
| |
| /* |
| * Immediately prior to deallocating the target structure, and |
| * after all activity to attached scsi devices has ceased, the |
| * midlayer calls this point so that the driver may deallocate |
| * and terminate any references to the target. |
| * |
| * Status: OPTIONAL |
| */ |
| void (* target_destroy)(struct scsi_target *); |
| |
| /* |
| * If a host has the ability to discover targets on its own instead |
| * of scanning the entire bus, it can fill in this function and |
| * call scsi_scan_host(). This function will be called periodically |
| * until it returns 1 with the scsi_host and the elapsed time of |
| * the scan in jiffies. |
| * |
| * Status: OPTIONAL |
| */ |
| int (* scan_finished)(struct Scsi_Host *, unsigned long); |
| |
| /* |
| * If the host wants to be called before the scan starts, but |
| * after the midlayer has set up ready for the scan, it can fill |
| * in this function. |
| * |
| * Status: OPTIONAL |
| */ |
| void (* scan_start)(struct Scsi_Host *); |
| |
| /* |
| * Fill in this function to allow the queue depth of this host |
| * to be changeable (on a per device basis). Returns either |
| * the current queue depth setting (may be different from what |
| * was passed in) or an error. An error should only be |
| * returned if the requested depth is legal but the driver was |
| * unable to set it. If the requested depth is illegal, the |
| * driver should set and return the closest legal queue depth. |
| * |
| * Status: OPTIONAL |
| */ |
| int (* change_queue_depth)(struct scsi_device *, int); |
| |
| /* |
| * This functions lets the driver expose the queue mapping |
| * to the block layer. |
| * |
| * Status: OPTIONAL |
| */ |
| void (* map_queues)(struct Scsi_Host *shost); |
| |
| /* |
| * SCSI interface of blk_poll - poll for IO completions. |
| * Only applicable if SCSI LLD exposes multiple h/w queues. |
| * |
| * Return value: Number of completed entries found. |
| * |
| * Status: OPTIONAL |
| */ |
| int (* mq_poll)(struct Scsi_Host *shost, unsigned int queue_num); |
| |
| /* |
| * Check if scatterlists need to be padded for DMA draining. |
| * |
| * Status: OPTIONAL |
| */ |
| bool (* dma_need_drain)(struct request *rq); |
| |
| /* |
| * This function determines the BIOS parameters for a given |
| * harddisk. These tend to be numbers that are made up by |
| * the host adapter. Parameters: |
| * size, device, list (heads, sectors, cylinders) |
| * |
| * Status: OPTIONAL |
| */ |
| int (* bios_param)(struct scsi_device *, struct block_device *, |
| sector_t, int []); |
| |
| /* |
| * This function is called when one or more partitions on the |
| * device reach beyond the end of the device. |
| * |
| * Status: OPTIONAL |
| */ |
| void (*unlock_native_capacity)(struct scsi_device *); |
| |
| /* |
| * Can be used to export driver statistics and other infos to the |
| * world outside the kernel ie. userspace and it also provides an |
| * interface to feed the driver with information. |
| * |
| * Status: OBSOLETE |
| */ |
| int (*show_info)(struct seq_file *, struct Scsi_Host *); |
| int (*write_info)(struct Scsi_Host *, char *, int); |
| |
| /* |
| * This is an optional routine that allows the transport to become |
| * involved when a scsi io timer fires. The return value tells the |
| * timer routine how to finish the io timeout handling. |
| * |
| * Status: OPTIONAL |
| */ |
| enum scsi_timeout_action (*eh_timed_out)(struct scsi_cmnd *); |
| /* |
| * Optional routine that allows the transport to decide if a cmd |
| * is retryable. Return true if the transport is in a state the |
| * cmd should be retried on. |
| */ |
| bool (*eh_should_retry_cmd)(struct scsi_cmnd *scmd); |
| |
| /* This is an optional routine that allows transport to initiate |
| * LLD adapter or firmware reset using sysfs attribute. |
| * |
| * Return values: 0 on success, -ve value on failure. |
| * |
| * Status: OPTIONAL |
| */ |
| |
| int (*host_reset)(struct Scsi_Host *shost, int reset_type); |
| #define SCSI_ADAPTER_RESET 1 |
| #define SCSI_FIRMWARE_RESET 2 |
| |
| |
| /* |
| * Name of proc directory |
| */ |
| const char *proc_name; |
| |
| /* |
| * This determines if we will use a non-interrupt driven |
| * or an interrupt driven scheme. It is set to the maximum number |
| * of simultaneous commands a single hw queue in HBA will accept. |
| */ |
| int can_queue; |
| |
| /* |
| * In many instances, especially where disconnect / reconnect are |
| * supported, our host also has an ID on the SCSI bus. If this is |
| * the case, then it must be reserved. Please set this_id to -1 if |
| * your setup is in single initiator mode, and the host lacks an |
| * ID. |
| */ |
| int this_id; |
| |
| /* |
| * This determines the degree to which the host adapter is capable |
| * of scatter-gather. |
| */ |
| unsigned short sg_tablesize; |
| unsigned short sg_prot_tablesize; |
| |
| /* |
| * Set this if the host adapter has limitations beside segment count. |
| */ |
| unsigned int max_sectors; |
| |
| /* |
| * Maximum size in bytes of a single segment. |
| */ |
| unsigned int max_segment_size; |
| |
| /* |
| * DMA scatter gather segment boundary limit. A segment crossing this |
| * boundary will be split in two. |
| */ |
| unsigned long dma_boundary; |
| |
| unsigned long virt_boundary_mask; |
| |
| /* |
| * This specifies "machine infinity" for host templates which don't |
| * limit the transfer size. Note this limit represents an absolute |
| * maximum, and may be over the transfer limits allowed for |
| * individual devices (e.g. 256 for SCSI-1). |
| */ |
| #define SCSI_DEFAULT_MAX_SECTORS 1024 |
| |
| /* |
| * True if this host adapter can make good use of linked commands. |
| * This will allow more than one command to be queued to a given |
| * unit on a given host. Set this to the maximum number of command |
| * blocks to be provided for each device. Set this to 1 for one |
| * command block per lun, 2 for two, etc. Do not set this to 0. |
| * You should make sure that the host adapter will do the right thing |
| * before you try setting this above 1. |
| */ |
| short cmd_per_lun; |
| |
| /* If use block layer to manage tags, this is tag allocation policy */ |
| int tag_alloc_policy; |
| |
| /* |
| * Track QUEUE_FULL events and reduce queue depth on demand. |
| */ |
| unsigned track_queue_depth:1; |
| |
| /* |
| * This specifies the mode that a LLD supports. |
| */ |
| unsigned supported_mode:2; |
| |
| /* |
| * True for emulated SCSI host adapters (e.g. ATAPI). |
| */ |
| unsigned emulated:1; |
| |
| /* |
| * True if the low-level driver performs its own reset-settle delays. |
| */ |
| unsigned skip_settle_delay:1; |
| |
| /* True if the controller does not support WRITE SAME */ |
| unsigned no_write_same:1; |
| |
| /* True if the host uses host-wide tagspace */ |
| unsigned host_tagset:1; |
| |
| /* The queuecommand callback may block. See also BLK_MQ_F_BLOCKING. */ |
| unsigned queuecommand_may_block:1; |
| |
| /* |
| * Countdown for host blocking with no commands outstanding. |
| */ |
| unsigned int max_host_blocked; |
| |
| /* |
| * Default value for the blocking. If the queue is empty, |
| * host_blocked counts down in the request_fn until it restarts |
| * host operations as zero is reached. |
| * |
| * FIXME: This should probably be a value in the template |
| */ |
| #define SCSI_DEFAULT_HOST_BLOCKED 7 |
| |
| /* |
| * Pointer to the SCSI host sysfs attribute groups, NULL terminated. |
| */ |
| const struct attribute_group **shost_groups; |
| |
| /* |
| * Pointer to the SCSI device attribute groups for this host, |
| * NULL terminated. |
| */ |
| const struct attribute_group **sdev_groups; |
| |
| /* |
| * Vendor Identifier associated with the host |
| * |
| * Note: When specifying vendor_id, be sure to read the |
| * Vendor Type and ID formatting requirements specified in |
| * scsi_netlink.h |
| */ |
| u64 vendor_id; |
| |
| /* Delay for runtime autosuspend */ |
| int rpm_autosuspend_delay; |
| }; |
| |
| /* |
| * Temporary #define for host lock push down. Can be removed when all |
| * drivers have been updated to take advantage of unlocked |
| * queuecommand. |
| * |
| */ |
| #define DEF_SCSI_QCMD(func_name) \ |
| int func_name(struct Scsi_Host *shost, struct scsi_cmnd *cmd) \ |
| { \ |
| unsigned long irq_flags; \ |
| int rc; \ |
| spin_lock_irqsave(shost->host_lock, irq_flags); \ |
| rc = func_name##_lck(cmd); \ |
| spin_unlock_irqrestore(shost->host_lock, irq_flags); \ |
| return rc; \ |
| } |
| |
| |
| /* |
| * shost state: If you alter this, you also need to alter scsi_sysfs.c |
| * (for the ascii descriptions) and the state model enforcer: |
| * scsi_host_set_state() |
| */ |
| enum scsi_host_state { |
| SHOST_CREATED = 1, |
| SHOST_RUNNING, |
| SHOST_CANCEL, |
| SHOST_DEL, |
| SHOST_RECOVERY, |
| SHOST_CANCEL_RECOVERY, |
| SHOST_DEL_RECOVERY, |
| }; |
| |
| struct Scsi_Host { |
| /* |
| * __devices is protected by the host_lock, but you should |
| * usually use scsi_device_lookup / shost_for_each_device |
| * to access it and don't care about locking yourself. |
| * In the rare case of being in irq context you can use |
| * their __ prefixed variants with the lock held. NEVER |
| * access this list directly from a driver. |
| */ |
| struct list_head __devices; |
| struct list_head __targets; |
| |
| struct list_head starved_list; |
| |
| spinlock_t default_lock; |
| spinlock_t *host_lock; |
| |
| struct mutex scan_mutex;/* serialize scanning activity */ |
| |
| struct list_head eh_abort_list; |
| struct list_head eh_cmd_q; |
| struct task_struct * ehandler; /* Error recovery thread. */ |
| struct completion * eh_action; /* Wait for specific actions on the |
| host. */ |
| wait_queue_head_t host_wait; |
| const struct scsi_host_template *hostt; |
| struct scsi_transport_template *transportt; |
| |
| struct kref tagset_refcnt; |
| struct completion tagset_freed; |
| /* Area to keep a shared tag map */ |
| struct blk_mq_tag_set tag_set; |
| |
| atomic_t host_blocked; |
| |
| unsigned int host_failed; /* commands that failed. |
| protected by host_lock */ |
| unsigned int host_eh_scheduled; /* EH scheduled without command */ |
| |
| unsigned int host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */ |
| |
| /* next two fields are used to bound the time spent in error handling */ |
| int eh_deadline; |
| unsigned long last_reset; |
| |
| |
| /* |
| * These three parameters can be used to allow for wide scsi, |
| * and for host adapters that support multiple busses |
| * The last two should be set to 1 more than the actual max id |
| * or lun (e.g. 8 for SCSI parallel systems). |
| */ |
| unsigned int max_channel; |
| unsigned int max_id; |
| u64 max_lun; |
| |
| /* |
| * This is a unique identifier that must be assigned so that we |
| * have some way of identifying each detected host adapter properly |
| * and uniquely. For hosts that do not support more than one card |
| * in the system at one time, this does not need to be set. It is |
| * initialized to 0 in scsi_register. |
| */ |
| unsigned int unique_id; |
| |
| /* |
| * The maximum length of SCSI commands that this host can accept. |
| * Probably 12 for most host adapters, but could be 16 for others. |
| * or 260 if the driver supports variable length cdbs. |
| * For drivers that don't set this field, a value of 12 is |
| * assumed. |
| */ |
| unsigned short max_cmd_len; |
| |
| int this_id; |
| int can_queue; |
| short cmd_per_lun; |
| short unsigned int sg_tablesize; |
| short unsigned int sg_prot_tablesize; |
| unsigned int max_sectors; |
| unsigned int opt_sectors; |
| unsigned int max_segment_size; |
| unsigned long dma_boundary; |
| unsigned long virt_boundary_mask; |
| /* |
| * In scsi-mq mode, the number of hardware queues supported by the LLD. |
| * |
| * Note: it is assumed that each hardware queue has a queue depth of |
| * can_queue. In other words, the total queue depth per host |
| * is nr_hw_queues * can_queue. However, for when host_tagset is set, |
| * the total queue depth is can_queue. |
| */ |
| unsigned nr_hw_queues; |
| unsigned nr_maps; |
| unsigned active_mode:2; |
| |
| /* |
| * Host has requested that no further requests come through for the |
| * time being. |
| */ |
| unsigned host_self_blocked:1; |
| |
| /* |
| * Host uses correct SCSI ordering not PC ordering. The bit is |
| * set for the minority of drivers whose authors actually read |
| * the spec ;). |
| */ |
| unsigned reverse_ordering:1; |
| |
| /* Task mgmt function in progress */ |
| unsigned tmf_in_progress:1; |
| |
| /* Asynchronous scan in progress */ |
| unsigned async_scan:1; |
| |
| /* Don't resume host in EH */ |
| unsigned eh_noresume:1; |
| |
| /* The controller does not support WRITE SAME */ |
| unsigned no_write_same:1; |
| |
| /* True if the host uses host-wide tagspace */ |
| unsigned host_tagset:1; |
| |
| /* The queuecommand callback may block. See also BLK_MQ_F_BLOCKING. */ |
| unsigned queuecommand_may_block:1; |
| |
| /* Host responded with short (<36 bytes) INQUIRY result */ |
| unsigned short_inquiry:1; |
| |
| /* The transport requires the LUN bits NOT to be stored in CDB[1] */ |
| unsigned no_scsi2_lun_in_cdb:1; |
| |
| /* |
| * Optional work queue to be utilized by the transport |
| */ |
| char work_q_name[20]; |
| struct workqueue_struct *work_q; |
| |
| /* |
| * Task management function work queue |
| */ |
| struct workqueue_struct *tmf_work_q; |
| |
| /* |
| * Value host_blocked counts down from |
| */ |
| unsigned int max_host_blocked; |
| |
| /* Protection Information */ |
| unsigned int prot_capabilities; |
| unsigned char prot_guard_type; |
| |
| /* legacy crap */ |
| unsigned long base; |
| unsigned long io_port; |
| unsigned char n_io_port; |
| unsigned char dma_channel; |
| unsigned int irq; |
| |
| |
| enum scsi_host_state shost_state; |
| |
| /* ldm bits */ |
| struct device shost_gendev, shost_dev; |
| |
| /* |
| * Points to the transport data (if any) which is allocated |
| * separately |
| */ |
| void *shost_data; |
| |
| /* |
| * Points to the physical bus device we'd use to do DMA |
| * Needed just in case we have virtual hosts. |
| */ |
| struct device *dma_dev; |
| |
| /* |
| * We should ensure that this is aligned, both for better performance |
| * and also because some compilers (m68k) don't automatically force |
| * alignment to a long boundary. |
| */ |
| unsigned long hostdata[] /* Used for storage of host specific stuff */ |
| __attribute__ ((aligned (sizeof(unsigned long)))); |
| }; |
| |
| #define class_to_shost(d) \ |
| container_of(d, struct Scsi_Host, shost_dev) |
| |
| #define shost_printk(prefix, shost, fmt, a...) \ |
| dev_printk(prefix, &(shost)->shost_gendev, fmt, ##a) |
| |
| static inline void *shost_priv(struct Scsi_Host *shost) |
| { |
| return (void *)shost->hostdata; |
| } |
| |
| int scsi_is_host_device(const struct device *); |
| |
| static inline struct Scsi_Host *dev_to_shost(struct device *dev) |
| { |
| while (!scsi_is_host_device(dev)) { |
| if (!dev->parent) |
| return NULL; |
| dev = dev->parent; |
| } |
| return container_of(dev, struct Scsi_Host, shost_gendev); |
| } |
| |
| static inline int scsi_host_in_recovery(struct Scsi_Host *shost) |
| { |
| return shost->shost_state == SHOST_RECOVERY || |
| shost->shost_state == SHOST_CANCEL_RECOVERY || |
| shost->shost_state == SHOST_DEL_RECOVERY || |
| shost->tmf_in_progress; |
| } |
| |
| extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *); |
| extern void scsi_flush_work(struct Scsi_Host *); |
| |
| extern struct Scsi_Host *scsi_host_alloc(const struct scsi_host_template *, int); |
| extern int __must_check scsi_add_host_with_dma(struct Scsi_Host *, |
| struct device *, |
| struct device *); |
| #if defined(CONFIG_SCSI_PROC_FS) |
| struct proc_dir_entry * |
| scsi_template_proc_dir(const struct scsi_host_template *sht); |
| #else |
| #define scsi_template_proc_dir(sht) NULL |
| #endif |
| extern void scsi_scan_host(struct Scsi_Host *); |
| extern void scsi_rescan_device(struct device *); |
| extern void scsi_remove_host(struct Scsi_Host *); |
| extern struct Scsi_Host *scsi_host_get(struct Scsi_Host *); |
| extern int scsi_host_busy(struct Scsi_Host *shost); |
| extern void scsi_host_put(struct Scsi_Host *t); |
| extern struct Scsi_Host *scsi_host_lookup(unsigned short); |
| extern const char *scsi_host_state_name(enum scsi_host_state); |
| extern void scsi_host_complete_all_commands(struct Scsi_Host *shost, |
| enum scsi_host_status status); |
| |
| static inline int __must_check scsi_add_host(struct Scsi_Host *host, |
| struct device *dev) |
| { |
| return scsi_add_host_with_dma(host, dev, dev); |
| } |
| |
| static inline struct device *scsi_get_device(struct Scsi_Host *shost) |
| { |
| return shost->shost_gendev.parent; |
| } |
| |
| /** |
| * scsi_host_scan_allowed - Is scanning of this host allowed |
| * @shost: Pointer to Scsi_Host. |
| **/ |
| static inline int scsi_host_scan_allowed(struct Scsi_Host *shost) |
| { |
| return shost->shost_state == SHOST_RUNNING || |
| shost->shost_state == SHOST_RECOVERY; |
| } |
| |
| extern void scsi_unblock_requests(struct Scsi_Host *); |
| extern void scsi_block_requests(struct Scsi_Host *); |
| extern int scsi_host_block(struct Scsi_Host *shost); |
| extern int scsi_host_unblock(struct Scsi_Host *shost, int new_state); |
| |
| void scsi_host_busy_iter(struct Scsi_Host *, |
| bool (*fn)(struct scsi_cmnd *, void *), void *priv); |
| |
| struct class_container; |
| |
| /* |
| * DIF defines the exchange of protection information between |
| * initiator and SBC block device. |
| * |
| * DIX defines the exchange of protection information between OS and |
| * initiator. |
| */ |
| enum scsi_host_prot_capabilities { |
| SHOST_DIF_TYPE1_PROTECTION = 1 << 0, /* T10 DIF Type 1 */ |
| SHOST_DIF_TYPE2_PROTECTION = 1 << 1, /* T10 DIF Type 2 */ |
| SHOST_DIF_TYPE3_PROTECTION = 1 << 2, /* T10 DIF Type 3 */ |
| |
| SHOST_DIX_TYPE0_PROTECTION = 1 << 3, /* DIX between OS and HBA only */ |
| SHOST_DIX_TYPE1_PROTECTION = 1 << 4, /* DIX with DIF Type 1 */ |
| SHOST_DIX_TYPE2_PROTECTION = 1 << 5, /* DIX with DIF Type 2 */ |
| SHOST_DIX_TYPE3_PROTECTION = 1 << 6, /* DIX with DIF Type 3 */ |
| }; |
| |
| /* |
| * SCSI hosts which support the Data Integrity Extensions must |
| * indicate their capabilities by setting the prot_capabilities using |
| * this call. |
| */ |
| static inline void scsi_host_set_prot(struct Scsi_Host *shost, unsigned int mask) |
| { |
| shost->prot_capabilities = mask; |
| } |
| |
| static inline unsigned int scsi_host_get_prot(struct Scsi_Host *shost) |
| { |
| return shost->prot_capabilities; |
| } |
| |
| static inline int scsi_host_prot_dma(struct Scsi_Host *shost) |
| { |
| return shost->prot_capabilities >= SHOST_DIX_TYPE0_PROTECTION; |
| } |
| |
| static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsigned int target_type) |
| { |
| static unsigned char cap[] = { 0, |
| SHOST_DIF_TYPE1_PROTECTION, |
| SHOST_DIF_TYPE2_PROTECTION, |
| SHOST_DIF_TYPE3_PROTECTION }; |
| |
| if (target_type >= ARRAY_SIZE(cap)) |
| return 0; |
| |
| return shost->prot_capabilities & cap[target_type] ? target_type : 0; |
| } |
| |
| static inline unsigned int scsi_host_dix_capable(struct Scsi_Host *shost, unsigned int target_type) |
| { |
| #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| static unsigned char cap[] = { SHOST_DIX_TYPE0_PROTECTION, |
| SHOST_DIX_TYPE1_PROTECTION, |
| SHOST_DIX_TYPE2_PROTECTION, |
| SHOST_DIX_TYPE3_PROTECTION }; |
| |
| if (target_type >= ARRAY_SIZE(cap)) |
| return 0; |
| |
| return shost->prot_capabilities & cap[target_type]; |
| #endif |
| return 0; |
| } |
| |
| /* |
| * All DIX-capable initiators must support the T10-mandated CRC |
| * checksum. Controllers can optionally implement the IP checksum |
| * scheme which has much lower impact on system performance. Note |
| * that the main rationale for the checksum is to match integrity |
| * metadata with data. Detecting bit errors are a job for ECC memory |
| * and buses. |
| */ |
| |
| enum scsi_host_guard_type { |
| SHOST_DIX_GUARD_CRC = 1 << 0, |
| SHOST_DIX_GUARD_IP = 1 << 1, |
| }; |
| |
| static inline void scsi_host_set_guard(struct Scsi_Host *shost, unsigned char type) |
| { |
| shost->prot_guard_type = type; |
| } |
| |
| static inline unsigned char scsi_host_get_guard(struct Scsi_Host *shost) |
| { |
| return shost->prot_guard_type; |
| } |
| |
| extern int scsi_host_set_state(struct Scsi_Host *, enum scsi_host_state); |
| |
| #endif /* _SCSI_SCSI_HOST_H */ |