606 lines
18 KiB
Groff
606 lines
18 KiB
Groff
.\" $NetBSD: scsipi.9,v 1.23 2009/05/04 20:10:19 wiz Exp $
|
|
.\"
|
|
.\"
|
|
.\" Copyright (c) 2001 Manuel Bouyer.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by Manuel Bouyer.
|
|
.\" 4. The name of the author may not be used to endorse or promote products
|
|
.\" derived from this software without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.\"
|
|
.Dd December 20, 2005
|
|
.Dt SCSIPI 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm scsipi
|
|
.Nd SCSI/ATAPI middle-layer interface
|
|
.Sh SYNOPSIS
|
|
.In dev/scsipi/atapiconf.h
|
|
.In dev/scsipi/scsiconf.h
|
|
.Ft void
|
|
.Fn scsipi_async_event "struct scsipi_channel *chan" "scsipi_async_event_t event" "void *arg"
|
|
.Ft void
|
|
.Fn scsipi_channel_freeze "struct scsipi_channel *chan" "int count"
|
|
.Ft void
|
|
.Fn scsipi_channel_thaw "struct scsipi_channel *chan" "int count"
|
|
.Ft void
|
|
.Fn scsipi_channel_timed_thaw "void *arg"
|
|
.Ft void
|
|
.Fn scsipi_periph_freeze "struct scsipi_periph *periph" "int count"
|
|
.Ft void
|
|
.Fn scsipi_periph_thaw "struct scsipi_periph *periph" "int count"
|
|
.Ft void
|
|
.Fn scsipi_periph_timed_thaw "void *arg"
|
|
.Ft void
|
|
.Fn scsipi_done "struct scsipi_xfer *xs"
|
|
.Ft void
|
|
.Fn scsipi_printaddr "struct scsipi_periph *periph"
|
|
.Ft int
|
|
.Fn scsipi_target_detach "struct scsipi_channel *chan" "int target" "int lun" "int flags"
|
|
.Ft int
|
|
.Fn scsipi_thread_call_callback "struct scsipi_channel *chan" "void (*callback)(struct scsipi_channel *, void *)" "void *arg"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
system is the middle layer interface between SCSI/ATAPI host bus
|
|
adapters (HBA) and high-level SCSI/ATAPI drivers.
|
|
This document describes the interfaces provided by the
|
|
.Nm
|
|
layer towards the HBA layer.
|
|
An HBA has to provide a pointer to a
|
|
.Va struct scsipi_adapter
|
|
and one pointer per channel to a
|
|
.Va struct scsipi_channel .
|
|
Once the SCSI or ATAPI bus is attached, the
|
|
.Nm
|
|
system will scan the bus and allocate a
|
|
.Va struct scsipi_periph
|
|
for each device found on the bus.
|
|
A high-level command (command sent from the high-level SCSI/ATAPI
|
|
layer to the low-level HBA layer) is described by a
|
|
.Va struct scsipi_xfer .
|
|
.Pp
|
|
A request is sent to the HBA driver through the
|
|
.Fn adapt_request
|
|
callback.
|
|
The HBA driver signals completion (with or without errors) of the
|
|
request through
|
|
.Fn scsipi_done .
|
|
.Nm
|
|
knows the resource's limits of the HBA (max number of concurrent requests per
|
|
adapter of channel, and per periph), and will make sure the HBA won't receive
|
|
more requests than it can handle.
|
|
.Pp
|
|
The mid-layer can also handle
|
|
.Dv QUEUE FULL
|
|
and
|
|
.Dv CHECK CONDITION
|
|
events.
|
|
.Ss INITIALISATION
|
|
An HBA driver has to allocate and initialize to 0 a
|
|
.Va struct scsipi_adapter
|
|
and fill in the following members:
|
|
.Bl -tag -width "struct_device *adapt_dev" -compact -offset indent
|
|
.It Va struct device *adapt_dev
|
|
pointer to the HBA's
|
|
.Va struct device
|
|
.It Va int adapt_nchannels
|
|
number of channels (or busses) of the adapter
|
|
.It Va int adapt_openings
|
|
total number of commands the adapter can handle (may be replaced by
|
|
.Va chan_openings ,
|
|
see below)
|
|
.It Va int adapt_max_periph
|
|
number of commands the adapter can handle per device
|
|
.El
|
|
.Pp
|
|
The following callbacks should be provided through the
|
|
.Va struct scsipi_adapter :
|
|
.Bl -tag -width someverylongword -compact -offset indent
|
|
.It void Fn (*adapt_request) "struct scsipi_channel *" "scsipi_adapter_req_t" "void *"
|
|
mandatory
|
|
.It void Fn (*adapt_minphys) "struct buf *"
|
|
mandatory
|
|
.It int Fn (*adapt_ioctl) "struct scsipi_channel *" "u_long" "void *" "int" "struct lwp *"
|
|
optional
|
|
.It int Fn (*adapt_enable) "struct device *" "int"
|
|
optional, set to
|
|
.Dv NULL
|
|
if not used
|
|
.It int Fn (*adapt_getgeom) "struct scsipi_periph *" "struct disk_parms *" "u_long"
|
|
optional, set to
|
|
.Dv NULL
|
|
if not used
|
|
.It int Fn (*adapt_accesschk) "struct scsipi_periph *" "struct scsipi_inquiry_pattern *"
|
|
optional, set to
|
|
.Dv NULL
|
|
if not used
|
|
.El
|
|
.Pp
|
|
The HBA driver has to allocate and initialize to 0 one
|
|
.Va struct scsipi_channel
|
|
per channel and fill in the following members:
|
|
.Bl -tag -width struct_scsipi_adapter -compact -offset indent
|
|
.It Va struct scsipi_adapter *chan_adapter
|
|
Pointer to the HBA's
|
|
.Fa struct scsipi_adapter
|
|
.It Va struct scsipi_bustype *chan_bustype
|
|
should be initialized to either
|
|
.Va bus_atapi
|
|
or
|
|
.Va bus_scsi ,
|
|
both defined in the
|
|
.Nm
|
|
code.
|
|
.It Va int chan_channel
|
|
channel number (starting at 0)
|
|
.It Va int chan_flags
|
|
channel flags:
|
|
.Bl -tag -width SCSIPI_CHAN_OPENINGS -compact
|
|
.It Dv SCSIPI_CHAN_OPENINGS
|
|
Use per-channel max number of commands
|
|
.Va chan_openings
|
|
instead of per-adapter
|
|
.Va adapt_openings
|
|
.It Dv SCSIPI_CHAN_CANGROW
|
|
This channel can grow its
|
|
.Va chan_openings
|
|
or
|
|
.Va adapt_openings
|
|
on request (via the
|
|
.Fn adapt_request
|
|
callback)
|
|
.It Dv SCSIPI_CHAN_NOSETTLE
|
|
Do not wait SCSI_DELAY seconds for devices to settle before probing (usually
|
|
used by adapters that provide an \*qabstracted\*q view of the bus).
|
|
.El
|
|
.It Va int chan_openings
|
|
total number of commands the adapter can handle for this channel (used only
|
|
if the
|
|
.Dv SCSIPI_CHAN_OPENINGS
|
|
flag is set)
|
|
.It Va chan_max_periph
|
|
number of commands per device the adapter can handle on this
|
|
channel (used only if the
|
|
.Va SCSIPI_CHAN_OPENINGS
|
|
flag is set)
|
|
.It Va int chan_ntargets
|
|
number of targets
|
|
.It Va int chan_nluns
|
|
number of LUNs per target
|
|
.It Va int chan_id
|
|
adapter's ID on this channel
|
|
.It Va int chan_defquirks
|
|
default device quirks.
|
|
Quirks are defined in
|
|
.Aq Pa dev/scsipi/scsipiconf.h
|
|
and are usually set in the middle layer based on the device's inquiry
|
|
data.
|
|
For some kinds of adapters it may be convenient to have a set of
|
|
quirks applied to all devices, regardless of the inquiry data.
|
|
.El
|
|
.Pp
|
|
The HBA driver attaches the SCSI or ATAPI bus (depending on the setting of
|
|
.Va chan_bustype )
|
|
by passing a pointer to the
|
|
.Va struct scsipi_channel
|
|
to the
|
|
.Xr autoconf 9
|
|
machinery.
|
|
The print function shall be either
|
|
.Fn scsiprint
|
|
or
|
|
.Fn atapiprint .
|
|
.Ss OTHER DATA STRUCTURES
|
|
When scanning the bus, the
|
|
.Nm
|
|
system allocates a
|
|
.Va struct scsipi_periph
|
|
for each device probed.
|
|
The interesting fields are:
|
|
.Bl -tag -width int_periph_openings -compact -offset indent
|
|
.It Va struct device *periph_dev
|
|
pointer to the device's
|
|
.Va struct device
|
|
.It Va struct scsipi_channel *periph_channel
|
|
pointer to the channel the device is connected to
|
|
.It Va int periph_quirks
|
|
device quirks, defined in
|
|
.Aq Pa dev/scsipi/scsipiconf.h
|
|
.It Va int periph_target
|
|
target ID, or drive number on ATAPI
|
|
.It Va int periph_lun
|
|
LUN (currently not used on ATAPI)
|
|
.El
|
|
.Pp
|
|
A SCSI or ATAPI request is passed to the HBA through a
|
|
.Va struct scsipi_xfer .
|
|
The HBA driver has access to the following data:
|
|
.Bl -tag -width "int xs_callout" -compact -offset indent
|
|
.It Va struct callout xs_callout
|
|
callout for adapter use, usually for command timeout
|
|
.It Va int xs_control
|
|
control flags (only flags of interest for HBA drivers are described):
|
|
.Bl -tag -width XS_CTL_DISCOVERY -compact
|
|
.It Dv XS_CTL_POLL
|
|
poll in the HBA driver for request completion (most likely because interrupts
|
|
are disabled)
|
|
.It Dv XS_CTL_RESET
|
|
reset the device
|
|
.It Dv XS_CTL_DATA_UIO
|
|
xs_data points to a
|
|
.Fa struct uio
|
|
buffer
|
|
.It Dv XS_CTL_DATA_IN
|
|
data is transferred from HBA to memory
|
|
.It Dv XS_CTL_DATA_OUT
|
|
data is transferred from memory to HBA
|
|
.It Dv XS_CTL_DISCOVERY
|
|
this xfer is part of a device discovery done by the middle layer
|
|
.It Dv XS_CTL_REQSENSE
|
|
xfer is a request sense
|
|
.El
|
|
.Pp
|
|
.It Va int xs_status
|
|
status flags:
|
|
.Bl -tag -width XS_STS_PRIVATE -compact
|
|
.It Va XS_STS_DONE
|
|
xfer is done (set by
|
|
.Fn scsipi_done )
|
|
.It Va XS_STS_PRIVATE
|
|
mask of flags reserved for HBA's use (0xf0000000)
|
|
.El
|
|
.Pp
|
|
.It Va struct scsipi_periph *xs_periph
|
|
periph doing the xfer
|
|
.It Va int timeout
|
|
command timeout, in milliseconds.
|
|
The HBA should start the timeout at the time the command is accepted
|
|
by the device.
|
|
If the timeout happens, the HBA shall terminate the command through
|
|
.Fn scsipi_done
|
|
with a XS_TIMEOUT error
|
|
.It Va struct scsipi_generic *cmd
|
|
scsipi command to execute
|
|
.It Va int cmdlen
|
|
len (in bytes) of the cmd buffer
|
|
.It Va u_char *data
|
|
data buffer (this is either a DMA or uio address)
|
|
.It Va int datalen
|
|
data length (in bytes, zero if uio)
|
|
.It Va int resid
|
|
difference between
|
|
.Fa datalen
|
|
and how much data was really transferred
|
|
.It Va scsipi_xfer_result_t error
|
|
error value returned by the HBA driver to mid-layer.
|
|
See description of
|
|
.Fn scsipi_done
|
|
for valid values
|
|
.It Va union {struct scsipi_sense_data scsi_sense; uint32_t atapi_sense;} sense
|
|
where to store sense info if
|
|
.Fa error
|
|
is
|
|
.Dv XS_SENSE
|
|
or
|
|
.Dv XS_SHORTSENSE
|
|
.It Va uint8_t status
|
|
SCSI status; checked by middle layer when
|
|
.Fa error is
|
|
.Dv XS_BUSY
|
|
(the middle layer handles
|
|
.Dv SCSI_CHECK
|
|
and
|
|
.Dv SCSI_QUEUE_FULL )
|
|
.It Va uint8_t xs_tag_type
|
|
SCSI tag type, set to 0 if untagged command
|
|
.It Va uint8_t xs_tag_id
|
|
tag ID, used for tagged commands
|
|
.El
|
|
.Ss FUNCTIONS AND CALLBACKS
|
|
.Bl -tag -width xxxxxxxx -compact
|
|
.It Fn (*adapt_request) "struct scsipi_channel *chan" "scsipi_adapter_req_t req" "void *arg"
|
|
Used by the mid-layer to transmit a request to the adapter.
|
|
.Va req
|
|
can be one of:
|
|
.Bl -tag -width xxxxxxxx -compact
|
|
.It Dv ADAPTER_REQ_RUN_XFER
|
|
request the adapter to send a command to the device.
|
|
.Fa arg
|
|
is a pointer to the
|
|
.Va struct scsipi_xfer .
|
|
Once the xfer is complete the HBA driver shall call
|
|
.Fn scsipi_done
|
|
with updated status and error information.
|
|
.It Dv ADAPTER_REQ_GROW_RESOURCES
|
|
ask the adapter to increase resources of the channel (grow
|
|
.Va adapt_openings
|
|
or
|
|
.Va chan_openings )
|
|
if possible.
|
|
Support of this feature is optional.
|
|
This request is called from the kernel completion thread.
|
|
.Fa arg
|
|
must be ignored.
|
|
.It Dv ADAPTER_REQ_SET_XFER_MODE
|
|
set the xfer mode for a for I_T Nexus.
|
|
This will be called once all LUNs of a target have been probed.
|
|
.Fa arg
|
|
points to a
|
|
.Va struct scsipi_xfer_mode
|
|
defined as follows:
|
|
.Bl -tag -width int_xm_target -compact
|
|
.It Va int xm_target
|
|
target for I_T Nexus
|
|
.It Va int xm_mode
|
|
bitmask of device capabilities
|
|
.It Va int xm_period
|
|
sync period
|
|
.It Va int xm_offset
|
|
sync offset
|
|
.El
|
|
.Pp
|
|
.Va xm_period
|
|
and
|
|
.Va xm_offset
|
|
shall be ignored for
|
|
.Dv ADAPTER_REQ_SET_XFER_MODE .
|
|
.Va xm_mode
|
|
holds the following bits:
|
|
.Bl -tag -width xxxxxxxx -compact
|
|
.It Dv PERIPH_CAP_SYNC
|
|
ST synchronous transfers
|
|
.It Dv PERIPH_CAP_WIDE16
|
|
ST 16 bit wide transfers
|
|
.It Dv PERIPH_CAP_WIDE32
|
|
ST 32 bit wide transfers
|
|
.It Dv PERIPH_CAP_DT
|
|
DT transfers
|
|
.It Dv PERIPH_CAP_TQING
|
|
tagged queuing
|
|
.El
|
|
Whenever the xfer mode changes, the driver should call
|
|
.Fn scsipi_async_event
|
|
to notify the mid-layer.
|
|
.El
|
|
.Pp
|
|
.Fn adapt_request
|
|
may be called from interrupt context.
|
|
.It Fn adapt_minphys
|
|
pointer to the driver's minphys function.
|
|
If the driver can handle transfers of size
|
|
.Dv MAXPHYS ,
|
|
this can point to
|
|
.Fn minphys .
|
|
.It Fn adapt_ioctl
|
|
ioctl function for the channel.
|
|
The only ioctl supported at this level is
|
|
.Dv SCBUSIORESET
|
|
for which the HBA driver shall issue a SCSI reset on the channel.
|
|
.It int Fn adapt_enable "struct device *dev" "int enable"
|
|
Disable the adapter if
|
|
.Va enable
|
|
is zero, or enable it if non-zero.
|
|
Returns 0 if operation is successful, or error from
|
|
.Pa \*[Lt]sys/errno.h\*[Gt] .
|
|
This callback is optional, and is useful mostly for hot-plug devices.
|
|
For example, this callback would power on or off
|
|
the relevant PCMCIA socket for a PCMCIA controller.
|
|
.It int Fn adapt_getgeom "struct scsipi_periph *periph" "struct disk_parms *params" "u_long sectors"
|
|
Optional callback, used by high-level drivers to get the fictitious geometry
|
|
used by the controller's firmware for the specified periph.
|
|
Returns 0 if successful.
|
|
See Adaptec drivers for details.
|
|
.It int Fn adapt_accesschk "struct scsipi_periph *periph" "struct scsipi_inquiry_pattern *inqbuf"
|
|
Optional callback; if present the mid-layer uses it to check if it can
|
|
attach a driver to the specified periph.
|
|
If the callback returns a non-zero value, the periph is ignored by the
|
|
.Nm
|
|
code.
|
|
This callback is used by adapters which want to drive some devices
|
|
themselves, for example hardware RAID controllers.
|
|
.It Fn scsipi_async_event "struct scsipi_channel *chan" "scsipi_async_event_t event" "void *arg"
|
|
Asynchronous event notification for the mid-layer.
|
|
.Fa event
|
|
can be one of:
|
|
.Bl -tag -width xxxxxxxx -compact
|
|
.It Dv ASYNC_EVENT_MAX_OPENINGS
|
|
set max openings for a periph.
|
|
Argument is a
|
|
.Va struct scsipi_max_openings
|
|
with at least the following members:
|
|
.Bl -tag -width xxxxxxxx -compact
|
|
.It Va int mo_target
|
|
.It Va int mo_lun
|
|
.It Va int mo_openings
|
|
.El
|
|
.Pp
|
|
Not all periphs may allow openings to increase; if not allowed the request is
|
|
silently ignored.
|
|
.It Dv ASYNC_EVENT_XFER_MODE
|
|
update the xfer mode for an I_T nexus.
|
|
Argument is a
|
|
.Va struct scsipi_xfer_mode
|
|
properly filled in.
|
|
An
|
|
.Dv ASYNC_EVENT_XFER_MODE
|
|
call with
|
|
.Dv PERIPH_CAP_TQING
|
|
set in
|
|
.Va xm_mode
|
|
is mandatory to activate tagged queuing.
|
|
.It Dv ASYNC_EVENT_RESET
|
|
channel has been reset.
|
|
No argument.
|
|
HBA drivers have to issue
|
|
.Dv ASYNC_EVENT_RESET events if they rely on the
|
|
mid-layer for SCSI CHECK CONDITION handling.
|
|
.El
|
|
.Pp
|
|
.It Fn scsipi_done "struct scsipi_xfer *xs"
|
|
shall be called by the HBA when the xfer is complete, or when it needs to
|
|
be requeued by the mid-layer.
|
|
.Va error
|
|
in the scsipi_xfer shall be set to one of the following:
|
|
.Bl -tag -width xxxxxxxx -compact
|
|
.It Dv XS_NOERROR
|
|
xfer completed without error.
|
|
.It Dv XS_SENSE
|
|
Check the returned SCSI sense for the error.
|
|
.It Dv XS_SHORTSENSE
|
|
Check the ATAPI sense for the error.
|
|
.It Dv XS_DRIVER_STUFFUP
|
|
Driver failed to perform operation.
|
|
.It Dv XS_RESOURCE_SHORTAGE
|
|
Adapter resource shortage.
|
|
The mid-layer will retry the command after some delay.
|
|
.It Dv XS_SELTIMEOUT
|
|
The device timed out while trying to send the command
|
|
.It Dv XS_TIMEOUT
|
|
The command was accepted by the device, but it didn't complete in allowed time.
|
|
.It Dv XS_BUSY
|
|
The mid-layer will check
|
|
.Va status
|
|
for additional details:
|
|
.Bl -tag -width SCSI_QUEUE_FULL -compact
|
|
.It Dv SCSI_CHECK
|
|
SCSI check condition.
|
|
The mid-layer will freeze the periph queue and issue a REQUEST SENSE command.
|
|
If the HBA supports tagged queuing, it shall remove and requeue any command
|
|
not yet accepted by the HBA (or at last make sure no more commands will
|
|
be sent to the device before the REQUEST SENSE is complete).
|
|
.It Dv SCSI_QUEUE_FULL
|
|
The mid layer will adjust the periph's openings and requeue the command.
|
|
.It Dv SCSI_BUSY
|
|
The mid-layer will requeue the xfer after delay.
|
|
.El
|
|
.It Dv XS_RESET
|
|
xfer destroyed by a reset; the mid-layer will requeue it.
|
|
.It Dv XS_REQUEUE
|
|
Ask the mid-layer to requeue this command immediately.
|
|
.El
|
|
.Pp
|
|
The adapter should not reference an
|
|
.Fa xfer
|
|
once
|
|
.Fn scsipi_done "xfer"
|
|
has been called, unless the
|
|
.Fa xfer
|
|
had
|
|
.Dv XS_CTL_POLL
|
|
set.
|
|
.Pp
|
|
.Fn scsipi_done
|
|
will call the
|
|
.Fn adapt_request
|
|
callback again only if called with
|
|
.Fa xs-\*[Gt]error
|
|
set to
|
|
.Dv XS_NOERROR ,
|
|
and
|
|
.Fa xfer
|
|
doesn't have
|
|
.Dv XS_CTL_POLL
|
|
set.
|
|
All other error conditions are handled by a kernel thread
|
|
(once the HBA's interrupt handler has returned).
|
|
.It Fn scsipi_printaddr "struct scsipi_periph *periph"
|
|
print a kernel message with the periph's name, in the form
|
|
device(controller:channel:target:lun).
|
|
.It Fn scsipi_channel_freeze "struct scsipi_channel *chan" "int count"
|
|
Freeze the specified channel (requests are queued but not sent to HBA).
|
|
The channel's freeze counter is increased by
|
|
.Fa count .
|
|
.It Fn scsipi_channel_thaw "struct scsipi_channel *chan" "int count"
|
|
Decrement the channel's freeze counter by
|
|
.Fa count
|
|
and process the queue if the counter goes to 0.
|
|
In order to preserve command ordering, HBA drivers should not call
|
|
.Fn scsipi_channel_thaw
|
|
before calling
|
|
.Fn scsipi_done
|
|
for all commands in the HBA's queue which need to be requeued.
|
|
.It Fn scsipi_periph_timed_thaw "void *arg"
|
|
Call
|
|
.Fn scsipi_channel_thaw "arg" "1" .
|
|
Intended to be used as
|
|
.Xr callout 9
|
|
callback.
|
|
.It Fn scsipi_periph_freeze "struct scsipi_periph *periph" "int count"
|
|
.It Fn scsipi_periph_thaw "struct scsipi_periph *periph"
|
|
.It Fn scsipi_periph_timed_thaw "void *arg"
|
|
Same as the channel counterparts, but only for one specific peripheral.
|
|
.It Fn scsipi_target_detach "struct scsipi_channel *chan" "int target" "int lun" "int flags"
|
|
detach the periph associated with this I_T_L nexus.
|
|
Both
|
|
.Fa target
|
|
and
|
|
.Fa lun
|
|
may be wildcarded using the magic value -1.
|
|
.Fa flags
|
|
is passed to
|
|
.Fn config_detach ""
|
|
\&.
|
|
Returns 0 if successful, or error code if a device couldn't be removed.
|
|
.It Fn scsipi_thread_call_callback "struct scsipi_channel *chan" "void (*callback)(struct scsipi_channel *, void *)" "void *arg"
|
|
.Fn callback
|
|
will be called with
|
|
.Fa chan
|
|
and
|
|
.Fa arg
|
|
as arguments, from the channel completion thread.
|
|
The callback is run at splbio.
|
|
.Fn scsipi_thread_call_callback
|
|
will freeze the channel by one, it's up to the caller to thaw it when
|
|
appropriate.
|
|
Returns 0 if the callback was properly recorded, or EBUSY if the
|
|
channel has already a callback pending.
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width sys/dev/atapiconf.h
|
|
.It Pa sys/dev/scsiconf.h
|
|
header file for use by SCSI HBA drivers
|
|
.It Pa sys/dev/atapiconf.h
|
|
header file for use by ATAPI HBA drivers
|
|
.El
|
|
.Pp
|
|
Both header files include
|
|
.Pa sys/dev/scsipiconf.h
|
|
which contains most structure definitions, function prototypes and macros.
|
|
.Sh EXAMPLES
|
|
The best examples are existing HBA drivers.
|
|
Most of them sit in the
|
|
.Pa sys/dev/ic
|
|
directory.
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
interface appeared in
|
|
.Nx 1.6 .
|
|
.Sh AUTHORS
|
|
The
|
|
.Nm
|
|
interface was designed and implemented by Jason R. Thorpe.
|
|
Manuel Bouyer converted most drivers to the new interface.
|