X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Fscsi%2Fscsi_host.h;h=d123ca84e732bf711fb965c66db8017ad468ec6a;hb=c826a3145736e3baabebccfd0aecfbb6dae059f2;hp=827992949c4bfe2b94635262483a4863aa0b2550;hpb=dfcd77d16b5745fbfea7d5636f15fc80cc05fef8;p=safe%2Fjmp%2Flinux-2.6 diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 8279929..d123ca8 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -6,7 +6,9 @@ #include #include #include +#include +struct request_queue; struct block_device; struct completion; struct module; @@ -16,6 +18,7 @@ struct scsi_target; struct Scsi_Host; struct scsi_host_cmd_pool; struct scsi_transport_template; +struct blk_queue_tags; /* @@ -23,24 +26,23 @@ struct scsi_transport_template; * NONE: Self evident. Host adapter is not capable of scatter-gather. * ALL: Means that the host adapter module can do scatter-gather, * and that there is no limit to the size of the table to which - * we scatter/gather data. + * we scatter/gather data. The value we set here is the maximum + * single element sglist. To use chained sglists, the adapter + * has to set a value beyond ALL (and correctly use the chain + * handling API. * Anything else: Indicates the maximum number of chains that can be * used in one scatter-gather request. */ #define SG_NONE 0 -#define SG_ALL 0xff +#define SG_ALL SCSI_MAX_SG_SEGMENTS +#define MODE_UNKNOWN 0x00 +#define MODE_INITIATOR 0x01 +#define MODE_TARGET 0x02 #define DISABLE_CLUSTERING 0 #define ENABLE_CLUSTERING 1 -enum scsi_eh_timer_return { - EH_NOT_HANDLED, - EH_HANDLED, - EH_RESET_TIMER, -}; - - struct scsi_host_template { struct module *module; const char *name; @@ -123,6 +125,27 @@ struct scsi_host_template { void (*done)(struct scsi_cmnd *)); /* + * The transfer functions are used to queue a scsi command to + * the LLD. When the driver is finished processing the command + * the done callback is invoked. + * + * This is called to inform the LLD to transfer + * scsi_bufflen(cmd) bytes. scsi_sg_count(cmd) speciefies the + * number of scatterlist entried in the command and + * scsi_sglist(cmd) returns the scatterlist. + * + * return values: see queuecommand + * + * If the LLD accepts the cmd, it should set the result to an + * appropriate value when completed before calling the done function. + * + * STATUS: REQUIRED FOR TARGET DRIVERS + */ + /* TODO: rename */ + int (* transfer_response)(struct scsi_cmnd *, + void (*done)(struct scsi_cmnd *)); + + /* * 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 @@ -140,27 +163,13 @@ struct scsi_host_template { * * Status: REQUIRED (at least one of them) */ - int (* eh_strategy_handler)(struct Scsi_Host *); 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 *); /* - * This is an optional routine to notify the host that the scsi - * timer just fired. The returns tell the timer routine what to - * do about this: - * - * EH_HANDLED: I fixed the error, please complete the command - * EH_RESET_TIMER: I need more time, reset the timer and - * begin counting again - * EH_NOT_HANDLED Begin normal error recovery - * - * Status: OPTIONAL - */ - enum scsi_eh_timer_return (* eh_timed_out)(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 @@ -255,35 +264,59 @@ struct scsi_host_template { void (* target_destroy)(struct scsi_target *); /* - * fill in this function to allow the queue depth of this host - * to be changeable (on a per device basis). returns either + * 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); /* - * fill in this function to allow the changing of tag types + * Fill in this function to allow the changing of tag types * (this also allows the enabling/disabling of tag command * queueing). An error should only be returned if something * went wrong in the driver while trying to set the tag type. * If the driver doesn't support the requested tag type, then * it should set the closest type it does support without * returning an error. Returns the actual tag type set. + * + * Status: OPTIONAL */ int (* change_queue_type)(struct scsi_device *, int); /* - * This function determines the bios parameters for a given + * 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 */ + * Status: OPTIONAL + */ int (* bios_param)(struct scsi_device *, struct block_device *, sector_t, int []); @@ -297,15 +330,22 @@ struct scsi_host_template { int (*proc_info)(struct Scsi_Host *, char *, char **, off_t, int, int); /* - * suspend support + * 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: + * EH_HANDLED: I fixed the error, please complete the command + * EH_RESET_TIMER: I need more time, reset the timer and + * begin counting again + * EH_NOT_HANDLED Begin normal error recovery + * + * Status: OPTIONAL */ - int (*resume)(struct scsi_device *); - int (*suspend)(struct scsi_device *); + enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *); /* * Name of proc directory */ - char *proc_name; + const char *proc_name; /* * Used to store the procfs directory if a driver implements the @@ -315,7 +355,7 @@ struct scsi_host_template { /* * This determines if we will use a non-interrupt driven - * or an interrupt driven scheme, It is set to the maximum number + * or an interrupt driven scheme. It is set to the maximum number * of simultaneous commands a given host adapter will accept. */ int can_queue; @@ -336,12 +376,12 @@ struct scsi_host_template { unsigned short sg_tablesize; /* - * If the host adapter has limitations beside segment count + * Set this if the host adapter has limitations beside segment count. */ unsigned short max_sectors; /* - * dma scatter gather segment boundary limit. a segment crossing this + * DMA scatter gather segment boundary limit. A segment crossing this * boundary will be split in two. */ unsigned long dma_boundary; @@ -350,7 +390,7 @@ struct scsi_host_template { * 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) + * individual devices (e.g. 256 for SCSI-1). */ #define SCSI_DEFAULT_MAX_SECTORS 1024 @@ -372,12 +412,17 @@ struct scsi_host_template { unsigned char present; /* - * true if this host adapter uses unchecked DMA onto an ISA bus. + * This specifies the mode that a LLD supports. + */ + unsigned supported_mode:2; + + /* + * True if this host adapter uses unchecked DMA onto an ISA bus. */ unsigned unchecked_isa_dma:1; /* - * true if this host adapter can make good use of clustering. + * True if this host adapter can make good use of clustering. * I originally thought that if the tablesize was large that it * was a waste of CPU cycles to prepare a cluster list, but * it works out that the Buslogic is faster if you use a smaller @@ -387,7 +432,7 @@ struct scsi_host_template { unsigned use_clustering:1; /* - * True for emulated SCSI host adapters (e.g. ATAPI) + * True for emulated SCSI host adapters (e.g. ATAPI). */ unsigned emulated:1; @@ -397,12 +442,12 @@ struct scsi_host_template { unsigned skip_settle_delay:1; /* - * ordered write support + * True if we are using ordered write support. */ unsigned ordered_tag:1; /* - * Countdown for host blocking with no commands outstanding + * Countdown for host blocking with no commands outstanding. */ unsigned int max_host_blocked; @@ -418,7 +463,7 @@ struct scsi_host_template { /* * Pointer to the sysfs class properties for this host, NULL terminated. */ - struct class_device_attribute **shost_attrs; + struct device_attribute **shost_attrs; /* * Pointer to the SCSI device properties for this host, NULL terminated. @@ -481,14 +526,21 @@ struct Scsi_Host { struct scsi_transport_template *transportt; /* + * Area to keep a shared tag map (if needed, will be + * NULL if not). + */ + struct blk_queue_tag *bqt; + + /* * The following two fields are protected with host_lock; * however, eh routines can safely access during eh processing * without acquiring the lock. */ unsigned int host_busy; /* commands actually active on low-level */ unsigned int host_failed; /* commands that failed. */ + unsigned int host_eh_scheduled; /* EH scheduled without command */ - unsigned short host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */ + unsigned int host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */ int resetting; /* if set, it means that last_reset is a valid value */ unsigned long last_reset; @@ -514,13 +566,11 @@ struct Scsi_Host { /* * 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. I am leaving this as a number rather than a bit - * because you never know what subsequent SCSI standards might do - * (i.e. could there be a 20 byte or a 24-byte command a few years - * down the road?). + * assumed. */ - unsigned char max_cmd_len; + unsigned short max_cmd_len; int this_id; int can_queue; @@ -532,8 +582,9 @@ struct Scsi_Host { * Used to assign serial numbers to the cmds. * Protected by the host lock. */ - unsigned long cmd_serial_number, cmd_pid; + unsigned long cmd_serial_number; + unsigned active_mode:2; unsigned unchecked_isa_dma:1; unsigned use_clustering:1; unsigned use_blk_tcq:1; @@ -547,19 +598,25 @@ struct Scsi_Host { /* * Host uses correct SCSI ordering not PC ordering. The bit is * set for the minority of drivers whose authors actually read - * the spec ;) + * the spec ;). */ unsigned reverse_ordering:1; /* - * ordered write support + * Ordered write support */ unsigned ordered_tag:1; + /* Task mgmt function in progress */ + unsigned tmf_in_progress:1; + + /* Asynchronous scan in progress */ + unsigned async_scan:1; + /* * Optional work queue to be utilized by the transport */ - char work_q_name[KOBJ_NAME_LEN]; + char work_q_name[20]; struct workqueue_struct *work_q; /* @@ -572,6 +629,16 @@ struct Scsi_Host { */ unsigned int max_host_blocked; + /* Protection Information */ + unsigned int prot_capabilities; + unsigned char prot_guard_type; + + /* + * q used for scsi_tgt msgs, async events or any other requests that + * need to be processed in userspace + */ + struct request_queue *uspace_req_q; + /* legacy crap */ unsigned long base; unsigned long io_port; @@ -583,8 +650,7 @@ struct Scsi_Host { enum scsi_host_state shost_state; /* ldm bits */ - struct device shost_gendev; - struct class_device shost_classdev; + struct device shost_gendev, shost_dev; /* * List of hosts per template. @@ -611,11 +677,15 @@ struct Scsi_Host { }; #define class_to_shost(d) \ - container_of(d, struct Scsi_Host, shost_classdev) + 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 *); @@ -633,7 +703,8 @@ 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->shost_state == SHOST_DEL_RECOVERY || + shost->tmf_in_progress; } extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *); @@ -651,11 +722,6 @@ extern const char *scsi_host_state_name(enum scsi_host_state); extern u64 scsi_calculate_bounce_limit(struct Scsi_Host *); -static inline void scsi_assign_lock(struct Scsi_Host *shost, spinlock_t *lock) -{ - shost->host_lock = lock; -} - static inline struct device *scsi_get_device(struct Scsi_Host *shost) { return shost->shost_gendev.parent; @@ -674,6 +740,9 @@ extern void scsi_unblock_requests(struct Scsi_Host *); extern void scsi_block_requests(struct Scsi_Host *); struct class_container; + +extern struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost, + void (*) (struct request_queue *)); /* * These two functions are used to allocate and free a pseudo device * which will connect to the host adapter itself rather than any @@ -684,6 +753,86 @@ struct class_container; extern void scsi_free_host_dev(struct scsi_device *); extern struct scsi_device *scsi_get_host_dev(struct Scsi_Host *); +/* + * 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 unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsigned int target_type) +{ + switch (target_type) { + case 1: return shost->prot_capabilities & SHOST_DIF_TYPE1_PROTECTION; + case 2: return shost->prot_capabilities & SHOST_DIF_TYPE2_PROTECTION; + case 3: return shost->prot_capabilities & SHOST_DIF_TYPE3_PROTECTION; + } + + return 0; +} + +static inline unsigned int scsi_host_dix_capable(struct Scsi_Host *shost, unsigned int target_type) +{ + switch (target_type) { + case 0: return shost->prot_capabilities & SHOST_DIX_TYPE0_PROTECTION; + case 1: return shost->prot_capabilities & SHOST_DIX_TYPE1_PROTECTION; + case 2: return shost->prot_capabilities & SHOST_DIX_TYPE2_PROTECTION; + case 3: return shost->prot_capabilities & SHOST_DIX_TYPE3_PROTECTION; + } + + 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; +} + /* legacy interfaces */ extern struct Scsi_Host *scsi_register(struct scsi_host_template *, int); extern void scsi_unregister(struct Scsi_Host *);