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![Christoph Hellwig](/assets/img/avatar_default.png)
We've had scsi-mq for 2.5 years now, so we can remove the unused flag to disable the code on a per-host basis that was put in for unexpected emergencies during bringup. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
932 lines
28 KiB
C
932 lines
28 KiB
C
#ifndef _SCSI_SCSI_HOST_H
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#define _SCSI_SCSI_HOST_H
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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#include <linux/mutex.h>
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#include <linux/seq_file.h>
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#include <linux/blk-mq.h>
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#include <scsi/scsi.h>
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struct request_queue;
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struct block_device;
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struct completion;
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struct module;
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struct scsi_cmnd;
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struct scsi_device;
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struct scsi_host_cmd_pool;
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struct scsi_target;
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struct Scsi_Host;
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struct scsi_host_cmd_pool;
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struct scsi_transport_template;
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struct blk_queue_tags;
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/*
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* The various choices mean:
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* NONE: Self evident. Host adapter is not capable of scatter-gather.
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* ALL: Means that the host adapter module can do scatter-gather,
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* and that there is no limit to the size of the table to which
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* we scatter/gather data. The value we set here is the maximum
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* single element sglist. To use chained sglists, the adapter
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* has to set a value beyond ALL (and correctly use the chain
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* handling API.
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* Anything else: Indicates the maximum number of chains that can be
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* used in one scatter-gather request.
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*/
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#define SG_NONE 0
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#define SG_ALL SG_CHUNK_SIZE
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#define MODE_UNKNOWN 0x00
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#define MODE_INITIATOR 0x01
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#define MODE_TARGET 0x02
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#define DISABLE_CLUSTERING 0
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#define ENABLE_CLUSTERING 1
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struct scsi_host_template {
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struct module *module;
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const char *name;
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/*
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* Used to initialize old-style drivers. For new-style drivers
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* just perform all work in your module initialization function.
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*
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* Status: OBSOLETE
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*/
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int (* detect)(struct scsi_host_template *);
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/*
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* Used as unload callback for hosts with old-style drivers.
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*
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* Status: OBSOLETE
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*/
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int (* release)(struct Scsi_Host *);
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/*
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* The info function will return whatever useful information the
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* developer sees fit. If not provided, then the name field will
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* be used instead.
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*
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* Status: OPTIONAL
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*/
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const char *(* info)(struct Scsi_Host *);
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/*
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* Ioctl interface
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*
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* Status: OPTIONAL
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*/
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int (* ioctl)(struct scsi_device *dev, int cmd, void __user *arg);
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#ifdef CONFIG_COMPAT
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/*
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* Compat handler. Handle 32bit ABI.
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* When unknown ioctl is passed return -ENOIOCTLCMD.
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*
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* Status: OPTIONAL
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*/
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int (* compat_ioctl)(struct scsi_device *dev, int cmd, void __user *arg);
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#endif
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/*
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* The queuecommand function is used to queue up a scsi
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* command block to the LLDD. When the driver finished
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* processing the command the done callback is invoked.
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*
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* If queuecommand returns 0, then the HBA has accepted the
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* command. The done() function must be called on the command
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* when the driver has finished with it. (you may call done on the
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* command before queuecommand returns, but in this case you
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* *must* return 0 from queuecommand).
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*
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* Queuecommand may also reject the command, in which case it may
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* not touch the command and must not call done() for it.
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*
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* There are two possible rejection returns:
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*
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* SCSI_MLQUEUE_DEVICE_BUSY: Block this device temporarily, but
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* allow commands to other devices serviced by this host.
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*
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* SCSI_MLQUEUE_HOST_BUSY: Block all devices served by this
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* host temporarily.
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*
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* For compatibility, any other non-zero return is treated the
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* same as SCSI_MLQUEUE_HOST_BUSY.
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*
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* NOTE: "temporarily" means either until the next command for#
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* this device/host completes, or a period of time determined by
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* I/O pressure in the system if there are no other outstanding
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* commands.
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*
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* STATUS: REQUIRED
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*/
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int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *);
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/*
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* This is an error handling strategy routine. You don't need to
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* define one of these if you don't want to - there is a default
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* routine that is present that should work in most cases. For those
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* driver authors that have the inclination and ability to write their
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* own strategy routine, this is where it is specified. Note - the
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* strategy routine is *ALWAYS* run in the context of the kernel eh
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* thread. Thus you are guaranteed to *NOT* be in an interrupt
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* handler when you execute this, and you are also guaranteed to
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* *NOT* have any other commands being queued while you are in the
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* strategy routine. When you return from this function, operations
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* return to normal.
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*
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* See scsi_error.c scsi_unjam_host for additional comments about
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* what this function should and should not be attempting to do.
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*
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* Status: REQUIRED (at least one of them)
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*/
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int (* eh_abort_handler)(struct scsi_cmnd *);
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int (* eh_device_reset_handler)(struct scsi_cmnd *);
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int (* eh_target_reset_handler)(struct scsi_cmnd *);
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int (* eh_bus_reset_handler)(struct scsi_cmnd *);
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int (* eh_host_reset_handler)(struct scsi_cmnd *);
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/*
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* Before the mid layer attempts to scan for a new device where none
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* currently exists, it will call this entry in your driver. Should
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* your driver need to allocate any structs or perform any other init
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* items in order to send commands to a currently unused target/lun
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* combo, then this is where you can perform those allocations. This
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* is specifically so that drivers won't have to perform any kind of
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* "is this a new device" checks in their queuecommand routine,
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* thereby making the hot path a bit quicker.
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*
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* Return values: 0 on success, non-0 on failure
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*
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* Deallocation: If we didn't find any devices at this ID, you will
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* get an immediate call to slave_destroy(). If we find something
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* here then you will get a call to slave_configure(), then the
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* device will be used for however long it is kept around, then when
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* the device is removed from the system (or * possibly at reboot
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* time), you will then get a call to slave_destroy(). This is
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* assuming you implement slave_configure and slave_destroy.
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* However, if you allocate memory and hang it off the device struct,
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* then you must implement the slave_destroy() routine at a minimum
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* in order to avoid leaking memory
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* each time a device is tore down.
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*
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* Status: OPTIONAL
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*/
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int (* slave_alloc)(struct scsi_device *);
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/*
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* Once the device has responded to an INQUIRY and we know the
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* device is online, we call into the low level driver with the
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* struct scsi_device *. If the low level device driver implements
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* this function, it *must* perform the task of setting the queue
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* depth on the device. All other tasks are optional and depend
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* on what the driver supports and various implementation details.
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*
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* Things currently recommended to be handled at this time include:
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*
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* 1. Setting the device queue depth. Proper setting of this is
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* described in the comments for scsi_change_queue_depth.
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* 2. Determining if the device supports the various synchronous
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* negotiation protocols. The device struct will already have
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* responded to INQUIRY and the results of the standard items
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* will have been shoved into the various device flag bits, eg.
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* device->sdtr will be true if the device supports SDTR messages.
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* 3. Allocating command structs that the device will need.
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* 4. Setting the default timeout on this device (if needed).
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* 5. Anything else the low level driver might want to do on a device
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* specific setup basis...
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* 6. Return 0 on success, non-0 on error. The device will be marked
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* as offline on error so that no access will occur. If you return
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* non-0, your slave_destroy routine will never get called for this
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* device, so don't leave any loose memory hanging around, clean
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* up after yourself before returning non-0
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*
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* Status: OPTIONAL
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*/
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int (* slave_configure)(struct scsi_device *);
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/*
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* Immediately prior to deallocating the device and after all activity
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* has ceased the mid layer calls this point so that the low level
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* driver may completely detach itself from the scsi device and vice
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* versa. The low level driver is responsible for freeing any memory
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* it allocated in the slave_alloc or slave_configure calls.
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*
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* Status: OPTIONAL
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*/
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void (* slave_destroy)(struct scsi_device *);
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/*
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* Before the mid layer attempts to scan for a new device attached
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* to a target where no target currently exists, it will call this
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* entry in your driver. Should your driver need to allocate any
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* structs or perform any other init items in order to send commands
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* to a currently unused target, then this is where you can perform
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* those allocations.
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*
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* Return values: 0 on success, non-0 on failure
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*
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* Status: OPTIONAL
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*/
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int (* target_alloc)(struct scsi_target *);
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/*
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* Immediately prior to deallocating the target structure, and
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* after all activity to attached scsi devices has ceased, the
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* midlayer calls this point so that the driver may deallocate
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* and terminate any references to the target.
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*
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* Status: OPTIONAL
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*/
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void (* target_destroy)(struct scsi_target *);
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/*
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* If a host has the ability to discover targets on its own instead
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* of scanning the entire bus, it can fill in this function and
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* call scsi_scan_host(). This function will be called periodically
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* until it returns 1 with the scsi_host and the elapsed time of
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* the scan in jiffies.
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*
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* Status: OPTIONAL
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*/
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int (* scan_finished)(struct Scsi_Host *, unsigned long);
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/*
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* If the host wants to be called before the scan starts, but
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* after the midlayer has set up ready for the scan, it can fill
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* in this function.
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*
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* Status: OPTIONAL
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*/
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void (* scan_start)(struct Scsi_Host *);
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/*
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* Fill in this function to allow the queue depth of this host
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* to be changeable (on a per device basis). Returns either
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* the current queue depth setting (may be different from what
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* was passed in) or an error. An error should only be
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* returned if the requested depth is legal but the driver was
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* unable to set it. If the requested depth is illegal, the
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* driver should set and return the closest legal queue depth.
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*
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* Status: OPTIONAL
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*/
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int (* change_queue_depth)(struct scsi_device *, int);
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/*
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* This function determines the BIOS parameters for a given
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* harddisk. These tend to be numbers that are made up by
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* the host adapter. Parameters:
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* size, device, list (heads, sectors, cylinders)
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*
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* Status: OPTIONAL
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*/
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int (* bios_param)(struct scsi_device *, struct block_device *,
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sector_t, int []);
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/*
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* This function is called when one or more partitions on the
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* device reach beyond the end of the device.
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*
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* Status: OPTIONAL
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*/
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void (*unlock_native_capacity)(struct scsi_device *);
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/*
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* Can be used to export driver statistics and other infos to the
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* world outside the kernel ie. userspace and it also provides an
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* interface to feed the driver with information.
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*
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* Status: OBSOLETE
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*/
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int (*show_info)(struct seq_file *, struct Scsi_Host *);
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int (*write_info)(struct Scsi_Host *, char *, int);
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/*
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* This is an optional routine that allows the transport to become
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* involved when a scsi io timer fires. The return value tells the
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* timer routine how to finish the io timeout handling:
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* EH_HANDLED: I fixed the error, please complete the command
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* EH_RESET_TIMER: I need more time, reset the timer and
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* begin counting again
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* EH_NOT_HANDLED Begin normal error recovery
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*
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* Status: OPTIONAL
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*/
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enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
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/* This is an optional routine that allows transport to initiate
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* LLD adapter or firmware reset using sysfs attribute.
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*
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* Return values: 0 on success, -ve value on failure.
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*
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* Status: OPTIONAL
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*/
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int (*host_reset)(struct Scsi_Host *shost, int reset_type);
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#define SCSI_ADAPTER_RESET 1
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#define SCSI_FIRMWARE_RESET 2
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/*
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* Name of proc directory
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*/
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const char *proc_name;
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/*
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* Used to store the procfs directory if a driver implements the
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* show_info method.
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*/
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struct proc_dir_entry *proc_dir;
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/*
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* This determines if we will use a non-interrupt driven
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* or an interrupt driven scheme. It is set to the maximum number
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* of simultaneous commands a given host adapter will accept.
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*/
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int can_queue;
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/*
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* In many instances, especially where disconnect / reconnect are
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* supported, our host also has an ID on the SCSI bus. If this is
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* the case, then it must be reserved. Please set this_id to -1 if
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* your setup is in single initiator mode, and the host lacks an
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* ID.
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*/
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int this_id;
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/*
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* This determines the degree to which the host adapter is capable
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* of scatter-gather.
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*/
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unsigned short sg_tablesize;
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unsigned short sg_prot_tablesize;
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/*
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* Set this if the host adapter has limitations beside segment count.
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*/
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unsigned int max_sectors;
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/*
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* DMA scatter gather segment boundary limit. A segment crossing this
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* boundary will be split in two.
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*/
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unsigned long dma_boundary;
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/*
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* This specifies "machine infinity" for host templates which don't
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* limit the transfer size. Note this limit represents an absolute
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* maximum, and may be over the transfer limits allowed for
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* individual devices (e.g. 256 for SCSI-1).
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*/
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#define SCSI_DEFAULT_MAX_SECTORS 1024
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/*
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* True if this host adapter can make good use of linked commands.
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* This will allow more than one command to be queued to a given
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* unit on a given host. Set this to the maximum number of command
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* blocks to be provided for each device. Set this to 1 for one
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* command block per lun, 2 for two, etc. Do not set this to 0.
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* You should make sure that the host adapter will do the right thing
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* before you try setting this above 1.
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*/
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short cmd_per_lun;
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/*
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* present contains counter indicating how many boards of this
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* type were found when we did the scan.
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*/
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unsigned char present;
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/* If use block layer to manage tags, this is tag allocation policy */
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int tag_alloc_policy;
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/*
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* Track QUEUE_FULL events and reduce queue depth on demand.
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*/
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unsigned track_queue_depth:1;
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/*
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* This specifies the mode that a LLD supports.
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*/
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unsigned supported_mode:2;
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/*
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* True if this host adapter uses unchecked DMA onto an ISA bus.
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*/
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unsigned unchecked_isa_dma:1;
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/*
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* True if this host adapter can make good use of clustering.
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* I originally thought that if the tablesize was large that it
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* was a waste of CPU cycles to prepare a cluster list, but
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* it works out that the Buslogic is faster if you use a smaller
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* number of segments (i.e. use clustering). I guess it is
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* inefficient.
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*/
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unsigned use_clustering:1;
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/*
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* True for emulated SCSI host adapters (e.g. ATAPI).
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*/
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unsigned emulated:1;
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/*
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* True if the low-level driver performs its own reset-settle delays.
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*/
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unsigned skip_settle_delay:1;
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/* True if the controller does not support WRITE SAME */
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unsigned no_write_same:1;
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/*
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* True if asynchronous aborts are not supported
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*/
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unsigned no_async_abort:1;
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/*
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* Countdown for host blocking with no commands outstanding.
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*/
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unsigned int max_host_blocked;
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/*
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* Default value for the blocking. If the queue is empty,
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* host_blocked counts down in the request_fn until it restarts
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* host operations as zero is reached.
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*
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* FIXME: This should probably be a value in the template
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*/
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#define SCSI_DEFAULT_HOST_BLOCKED 7
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/*
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* Pointer to the sysfs class properties for this host, NULL terminated.
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*/
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struct device_attribute **shost_attrs;
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/*
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* Pointer to the SCSI device properties for this host, NULL terminated.
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*/
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struct device_attribute **sdev_attrs;
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/*
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* List of hosts per template.
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*
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* This is only for use by scsi_module.c for legacy templates.
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* For these access to it is synchronized implicitly by
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* module_init/module_exit.
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*/
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struct list_head legacy_hosts;
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/*
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* Vendor Identifier associated with the host
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*
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* Note: When specifying vendor_id, be sure to read the
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* Vendor Type and ID formatting requirements specified in
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* scsi_netlink.h
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*/
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u64 vendor_id;
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/*
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* Additional per-command data allocated for the driver.
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*/
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unsigned int cmd_size;
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struct scsi_host_cmd_pool *cmd_pool;
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};
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/*
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* Temporary #define for host lock push down. Can be removed when all
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* drivers have been updated to take advantage of unlocked
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* queuecommand.
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*
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*/
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#define DEF_SCSI_QCMD(func_name) \
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int func_name(struct Scsi_Host *shost, struct scsi_cmnd *cmd) \
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{ \
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unsigned long irq_flags; \
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int rc; \
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spin_lock_irqsave(shost->host_lock, irq_flags); \
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scsi_cmd_get_serial(shost, cmd); \
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rc = func_name##_lck (cmd, cmd->scsi_done); \
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spin_unlock_irqrestore(shost->host_lock, irq_flags); \
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return rc; \
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}
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|
|
|
/*
|
|
* 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 scsi_host_cmd_pool *cmd_pool;
|
|
spinlock_t free_list_lock;
|
|
struct list_head free_list; /* backup store of cmd structs */
|
|
struct list_head starved_list;
|
|
|
|
spinlock_t default_lock;
|
|
spinlock_t *host_lock;
|
|
|
|
struct mutex scan_mutex;/* serialize scanning activity */
|
|
|
|
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;
|
|
struct scsi_host_template *hostt;
|
|
struct scsi_transport_template *transportt;
|
|
|
|
/*
|
|
* Area to keep a shared tag map (if needed, will be
|
|
* NULL if not).
|
|
*/
|
|
union {
|
|
struct blk_queue_tag *bqt;
|
|
struct blk_mq_tag_set tag_set;
|
|
};
|
|
|
|
atomic_t host_busy; /* commands actually active on low-level */
|
|
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 long dma_boundary;
|
|
/*
|
|
* 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.
|
|
*/
|
|
unsigned nr_hw_queues;
|
|
/*
|
|
* Used to assign serial numbers to the cmds.
|
|
* Protected by the host lock.
|
|
*/
|
|
unsigned long cmd_serial_number;
|
|
|
|
unsigned active_mode:2;
|
|
unsigned unchecked_isa_dma:1;
|
|
unsigned use_clustering:1;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
unsigned use_blk_mq:1;
|
|
unsigned use_cmd_list:1;
|
|
|
|
/* Host responded with short (<36 bytes) INQUIRY result */
|
|
unsigned short_inquiry: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;
|
|
|
|
/* The transport requires the LUN bits NOT to be stored in CDB[1] */
|
|
unsigned no_scsi2_lun_in_cdb:1;
|
|
|
|
/*
|
|
* Value host_blocked counts down from
|
|
*/
|
|
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;
|
|
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;
|
|
|
|
/*
|
|
* List of hosts per template.
|
|
*
|
|
* This is only for use by scsi_module.c for legacy templates.
|
|
* For these access to it is synchronized implicitly by
|
|
* module_init/module_exit.
|
|
*/
|
|
struct list_head sht_legacy_list;
|
|
|
|
/*
|
|
* 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[0] /* 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 bool scsi_use_blk_mq;
|
|
|
|
static inline bool shost_use_blk_mq(struct Scsi_Host *shost)
|
|
{
|
|
return scsi_use_blk_mq;
|
|
|
|
}
|
|
|
|
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(struct scsi_host_template *, int);
|
|
extern int __must_check scsi_add_host_with_dma(struct Scsi_Host *,
|
|
struct device *,
|
|
struct device *);
|
|
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 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_cmd_get_serial(struct Scsi_Host *, struct scsi_cmnd *);
|
|
|
|
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 *);
|
|
|
|
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
|
|
* physical device. You must deallocate when you are done with the
|
|
* thing. This physical pseudo-device isn't real and won't be available
|
|
* from any high-level drivers.
|
|
*/
|
|
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 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;
|
|
}
|
|
|
|
/* legacy interfaces */
|
|
extern struct Scsi_Host *scsi_register(struct scsi_host_template *, int);
|
|
extern void scsi_unregister(struct Scsi_Host *);
|
|
extern int scsi_host_set_state(struct Scsi_Host *, enum scsi_host_state);
|
|
|
|
#endif /* _SCSI_SCSI_HOST_H */
|