scsi_exit_devinfo – remove /proc/scsi/device_info & the scsi_dev_info_list Synopsis void scsi_exit_devinfo(void); Arguments void no arguments Authors James Bottomley <James.Bottomley [at] hansenpartnership.com> Author. Rob Landley <rob [at] landley.net> Author. Copyright
scsi_execute – insert request and wait for the result Synopsis int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, int data_direction, void *buffer, unsigned bufflen, unsigned char *sense, int timeout, int retries, u64 flags, int *resid); Arguments sdev scsi device cmd scsi command data_direction data direction buffer data buffer bufflen len of buffer sense optional sense…
scsi_eh_restore_cmnd – Restore a scsi command info as part of error recovery Synopsis void scsi_eh_restore_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses); Arguments scmd SCSI command structure to restore ses saved information from a coresponding call to scsi_eh_prep_cmnd Description Undo any damage done by above scsi_eh_prep_cmnd. Authors James Bottomley <James.Bottomley [at] hansenpartnership.com> Author. Rob Landley <rob [at]…
scsi_eh_ready_devs – check device ready state and recover if not. Synopsis void scsi_eh_ready_devs(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q); Arguments shost host to be recovered. work_q list_head for pending commands. done_q list_head for processed commands. Authors James Bottomley <James.Bottomley [at] hansenpartnership.com> Author. Rob Landley <rob [at] landley.net> Author. Copyright
scsi_eh_prep_cmnd – Save a scsi command info as part of error recovery Synopsis void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, unsigned char *cmnd, int cmnd_size, unsigned sense_bytes); Arguments scmd SCSI command structure to hijack ses structure to save restore information cmnd CDB to send. Can be NULL if no new cmnd is needed cmnd_size size…
scsi_eh_get_sense – Get device sense data. Synopsis int scsi_eh_get_sense(struct list_head *work_q, struct list_head *done_q); Arguments work_q Queue of commands to process. done_q Queue of processed commands. Description See if we need to request sense information. if so, then get it now, so we have a better idea of what to do. Notes This has the…
scsi_eh_flush_done_q – finish processed commands or retry them. Synopsis void scsi_eh_flush_done_q(struct list_head *done_q); Arguments done_q list_head of processed commands. Authors James Bottomley <James.Bottomley [at] hansenpartnership.com> Author. Rob Landley <rob [at] landley.net> Author. Copyright
scsi_eh_finish_cmd – Handle a cmd that eh is finished with. Synopsis void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q); Arguments scmd Original SCSI cmd that eh has finished. done_q Queue for processed commands. Notes We don’t want to use the normal command completion while we are are still handling errors – it may cause other commands…
scsi_dma_unmap – unmap command’s sg lists mapped by scsi_dma_map Synopsis void scsi_dma_unmap(struct scsi_cmnd *cmd); Arguments cmd scsi command Authors James Bottomley <James.Bottomley [at] hansenpartnership.com> Author. Rob Landley <rob [at] landley.net> Author. Copyright
scsi_dma_map – perform DMA mapping against command’s sg lists Synopsis int scsi_dma_map(struct scsi_cmnd *cmd); Arguments cmd scsi command Description Returns the number of sg lists actually used, zero if the sg lists is NULL, or -ENOMEM if the mapping failed. Authors James Bottomley <James.Bottomley [at] hansenpartnership.com> Author. Rob Landley <rob [at] landley.net> Author. Copyright
scsi_device_supports_vpd – test if a device supports VPD pages Synopsis int scsi_device_supports_vpd(struct scsi_device *sdev); Arguments sdev the struct scsi_device to test Description If the ‘try_vpd_pages’ flag is set it takes precedence. Otherwise we will assume VPD pages are supported if the SCSI level is at least SPC-3 and ‘skip_vpd_pages’ is not set. Authors James Bottomley…
scsi_device_set_state – Take the given device through the device state model. Synopsis int scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state); Arguments sdev scsi device to change the state of. state state to change to. Description Returns zero if unsuccessful or an error if the requested transition is illegal. Authors James Bottomley <James.Bottomley [at] hansenpartnership.com> Author. Rob…
scsi_device_resume – Restart user issued commands to a quiesced device. Synopsis void scsi_device_resume(struct scsi_device *sdev); Arguments sdev scsi device to resume. Description Moves the device from quiesced back to running and restarts the queues. Must be called with user context, may sleep. Authors James Bottomley <James.Bottomley [at] hansenpartnership.com> Author. Rob Landley <rob [at] landley.net> Author….
scsi_device_quiesce – Block user issued commands. Synopsis int scsi_device_quiesce(struct scsi_device *sdev); Arguments sdev scsi device to quiesce. Description This works by trying to transition to the SDEV_QUIESCE state (which must be a legal transition). When the device is in this state, only special requests will be accepted, all others will be deferred. Since special requests…
scsi_device_put – release a reference to a scsi_device Synopsis void scsi_device_put(struct scsi_device *sdev); Arguments sdev device to release a reference on. Description Release a reference to the scsi_device and decrements the use count of the underlying LLDD module. The device is freed once the last user vanishes. Authors James Bottomley <James.Bottomley [at] hansenpartnership.com> Author. Rob…
scsi_device_lookup_by_target – find a device given the target Synopsis struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget, u64 lun); Arguments starget SCSI target pointer lun SCSI Logical Unit Number Description Looks up the scsi_device with the specified lun for a given starget. The returned scsi_device has an additional reference that needs to be released with scsi_device_put once you’re…
scsi_device_lookup – find a device given the host Synopsis struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost, uint channel, uint id, u64 lun); Arguments shost SCSI host pointer channel SCSI channel (zero if only one channel) id SCSI target number (physical unit number) lun SCSI Logical Unit Number Description Looks up the scsi_device with the specified channel, id,…
scsi_device_get – get an additional reference to a scsi_device Synopsis int scsi_device_get(struct scsi_device *sdev); Arguments sdev device to get a reference to Description Gets a reference to the scsi_device and increments the use count of the underlying LLDD module. You must hold host_lock of the parent Scsi_Host or already have a reference when calling this….
scsi_dev_info_list_find – find a matching dev_info list entry. Synopsis struct scsi_dev_info_list *scsi_dev_info_list_find(const char *vendor, const char *model, int key); Arguments vendor vendor string model model (product) string key specify list to use Description Finds the first dev_info entry matching vendor, model in list specified by key. Return pointer to matching entry, or ERR_PTR on failure….
scsi_dev_info_list_add_str – parse dev_list and add to the scsi_dev_info_list. Synopsis int scsi_dev_info_list_add_str(char *dev_list); Arguments dev_list string of device flags to add Description Parse dev_list, and add entries to the scsi_dev_info_list. dev_list is of the form “vendor:product:flag,vendor:product:flag”. dev_list is modified via strsep. Can be called for command line addition, for proc or mabye a sysfs interface….