#include <linux/types.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
+#include <scsi/scsi.h>
struct request_queue;
struct block_device;
* 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;
* the done callback is invoked.
*
* This is called to inform the LLD to transfer
- * cmd->request_bufflen bytes. The cmd->use_sg speciefies the
+ * scsi_bufflen(cmd) bytes. scsi_sg_count(cmd) speciefies the
* number of scatterlist entried in the command and
- * cmd->request_buffer contains the scatterlist.
+ * scsi_sglist(cmd) returns the scatterlist.
*
* return values: see queuecommand
*
int (* transfer_response)(struct scsi_cmnd *,
void (*done)(struct scsi_cmnd *));
- /* Used as callback for the completion of task management request. */
- int (* tsk_mgmt_response)(u64 mid, int result);
-
/*
* 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
*/
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 *);
* 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
+ * 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 []);
*
* Status: OPTIONAL
*/
- enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
+ 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
/*
* 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;
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;
* 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
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
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;
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;
/*
* 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.
struct scsi_transport_template *transportt;
/*
- * area to keep a shared tag map (if needed, will be
- * NULL if not)
+ * Area to keep a shared tag map (if needed, will be
+ * NULL if not).
*/
struct blk_queue_tag *bqt;
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;
/*
* 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;
* 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;
/*
* 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 */
+ /* Task mgmt function in progress */
unsigned tmf_in_progress:1;
/* Asynchronous scan in progress */
/*
* 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;
/*
*/
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
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.
};
#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 *);
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 *);