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[SCSI] Small cleanups for scsi_host.h 

Small cleanups in scsi_host.h. Few #defines make me wonder if their
description is still up to date..?

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Pavel Machek 2008-02-04 23:53:24 -08:00 committed by James Bottomley
parent 8144f2137b
commit d850bd34f5
1 changed files with 25 additions and 19 deletions
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44
include/scsi/scsi_host.h
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@ -280,39 +280,45 @@ struct scsi_host_template {
* If the host wants to be called before the scan starts, but * 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 * after the midlayer has set up ready for the scan, it can fill
* in this function. * in this function.
*
* Status: OPTIONAL
*/ */
void (* scan_start)(struct Scsi_Host *); void (* scan_start)(struct Scsi_Host *);
/* /*
* fill in this function to allow the queue depth of this host * Fill in this function to allow the queue depth of this host
* to be changeable (on a per device basis). returns either * to be changeable (on a per device basis). Returns either
* the current queue depth setting (may be different from what * the current queue depth setting (may be different from what
* was passed in) or an error. An error should only be * was passed in) or an error. An error should only be
* returned if the requested depth is legal but the driver was * returned if the requested depth is legal but the driver was
* unable to set it. If the requested depth is illegal, the * unable to set it. If the requested depth is illegal, the
* driver should set and return the closest legal queue depth. * driver should set and return the closest legal queue depth.
* *
* Status: OPTIONAL
*/ */
int (* change_queue_depth)(struct scsi_device *, int); 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 * (this also allows the enabling/disabling of tag command
* queueing). An error should only be returned if something * queueing). An error should only be returned if something
* went wrong in the driver while trying to set the tag type. * went wrong in the driver while trying to set the tag type.
* If the driver doesn't support the requested tag type, then * If the driver doesn't support the requested tag type, then
* it should set the closest type it does support without * it should set the closest type it does support without
* returning an error. Returns the actual tag type set. * returning an error. Returns the actual tag type set.
*
* Status: OPTIONAL
*/ */
int (* change_queue_type)(struct scsi_device *, int); 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 * harddisk. These tend to be numbers that are made up by
* the host adapter. Parameters: * the host adapter. Parameters:
* size, device, list (heads, sectors, cylinders) * size, device, list (heads, sectors, cylinders)
* *
* Status: OPTIONAL */ * Status: OPTIONAL
*/
int (* bios_param)(struct scsi_device *, struct block_device *, int (* bios_param)(struct scsi_device *, struct block_device *,
sector_t, int []); sector_t, int []);
@ -351,7 +357,7 @@ struct scsi_host_template {
/* /*
* This determines if we will use a non-interrupt driven * 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. * of simultaneous commands a given host adapter will accept.
*/ */
int can_queue; int can_queue;
@ -372,12 +378,12 @@ struct scsi_host_template {
unsigned short sg_tablesize; 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; 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. * boundary will be split in two.
*/ */
unsigned long dma_boundary; unsigned long dma_boundary;
@ -386,7 +392,7 @@ struct scsi_host_template {
* This specifies "machine infinity" for host templates which don't * This specifies "machine infinity" for host templates which don't
* limit the transfer size. Note this limit represents an absolute * limit the transfer size. Note this limit represents an absolute
* maximum, and may be over the transfer limits allowed for * 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 #define SCSI_DEFAULT_MAX_SECTORS 1024
@ -413,12 +419,12 @@ struct scsi_host_template {
unsigned supported_mode:2; unsigned supported_mode:2;
/* /*
* true if this host adapter uses unchecked DMA onto an ISA bus. * True if this host adapter uses unchecked DMA onto an ISA bus.
*/ */
unsigned unchecked_isa_dma:1; 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 * I originally thought that if the tablesize was large that it
* was a waste of CPU cycles to prepare a cluster list, but * 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 * it works out that the Buslogic is faster if you use a smaller
@ -428,7 +434,7 @@ struct scsi_host_template {
unsigned use_clustering:1; 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 emulated:1;
@ -438,12 +444,12 @@ struct scsi_host_template {
unsigned skip_settle_delay:1; unsigned skip_settle_delay:1;
/* /*
* ordered write support * True if we are using ordered write support.
*/ */
unsigned ordered_tag:1; 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; unsigned int max_host_blocked;
@ -522,8 +528,8 @@ struct Scsi_Host {
struct scsi_transport_template *transportt; struct scsi_transport_template *transportt;
/* /*
* area to keep a shared tag map (if needed, will be * Area to keep a shared tag map (if needed, will be
* NULL if not) * NULL if not).
*/ */
struct blk_queue_tag *bqt; struct blk_queue_tag *bqt;
@ -596,16 +602,16 @@ struct Scsi_Host {
/* /*
* Host uses correct SCSI ordering not PC ordering. The bit is * Host uses correct SCSI ordering not PC ordering. The bit is
* set for the minority of drivers whose authors actually read * set for the minority of drivers whose authors actually read
* the spec ;) * the spec ;).
*/ */
unsigned reverse_ordering:1; unsigned reverse_ordering:1;
/* /*
* ordered write support * Ordered write support
*/ */
unsigned ordered_tag:1; unsigned ordered_tag:1;
/* task mgmt function in progress */ /* Task mgmt function in progress */
unsigned tmf_in_progress:1; unsigned tmf_in_progress:1;
/* Asynchronous scan in progress */ /* Asynchronous scan in progress */