f281233d3e
Move the mid-layer's ->queuecommand() invocation from being locked with the host lock to being unlocked to facilitate speeding up the critical path for drivers who don't need this lock taken anyway. The patch below presents a simple SCSI host lock push-down as an equivalent transformation. No locking or other behavior should change with this patch. All existing bugs and locking orders are preserved. Additionally, add one parameter to queuecommand, struct Scsi_Host * and remove one parameter from queuecommand, void (*done)(struct scsi_cmnd *) Scsi_Host* is a convenient pointer that most host drivers need anyway, and 'done' is redundant to struct scsi_cmnd->scsi_done. Minimal code disturbance was attempted with this change. Most drivers needed only two one-line modifications for their host lock push-down. Signed-off-by: Jeff Garzik <jgarzik@redhat.com> Acked-by: James Bottomley <James.Bottomley@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/*
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* DTC controller, taken from T128 driver by...
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* Copyright 1993, Drew Eckhardt
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* Visionary Computing
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* (Unix and Linux consulting and custom programming)
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* drew@colorado.edu
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* +1 (303) 440-4894
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*
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* DISTRIBUTION RELEASE 2.
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*
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* For more information, please consult
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*
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*
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*
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* and
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*
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* NCR 5380 Family
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* SCSI Protocol Controller
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* Databook
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*
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* NCR Microelectronics
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* 1635 Aeroplaza Drive
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* Colorado Springs, CO 80916
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* 1+ (719) 578-3400
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* 1+ (800) 334-5454
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*/
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#ifndef DTC3280_H
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#define DTC3280_H
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#define DTCDEBUG 0
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#define DTCDEBUG_INIT 0x1
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#define DTCDEBUG_TRANSFER 0x2
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static int dtc_abort(Scsi_Cmnd *);
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static int dtc_biosparam(struct scsi_device *, struct block_device *,
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sector_t, int*);
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static int dtc_detect(struct scsi_host_template *);
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static int dtc_queue_command(struct Scsi_Host *, struct scsi_cmnd *);
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static int dtc_bus_reset(Scsi_Cmnd *);
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#ifndef CMD_PER_LUN
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#define CMD_PER_LUN 2
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#endif
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#ifndef CAN_QUEUE
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#define CAN_QUEUE 32
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#endif
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#define NCR5380_implementation_fields \
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void __iomem *base
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#define NCR5380_local_declare() \
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void __iomem *base
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#define NCR5380_setup(instance) \
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base = ((struct NCR5380_hostdata *)(instance)->hostdata)->base
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#define DTC_address(reg) (base + DTC_5380_OFFSET + reg)
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#define dbNCR5380_read(reg) \
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(rval=readb(DTC_address(reg)), \
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(((unsigned char) printk("DTC : read register %d at addr %p is: %02x\n"\
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, (reg), DTC_address(reg), rval)), rval ) )
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#define dbNCR5380_write(reg, value) do { \
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printk("DTC : write %02x to register %d at address %p\n", \
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(value), (reg), DTC_address(reg)); \
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writeb(value, DTC_address(reg));} while(0)
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#if !(DTCDEBUG & DTCDEBUG_TRANSFER)
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#define NCR5380_read(reg) (readb(DTC_address(reg)))
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#define NCR5380_write(reg, value) (writeb(value, DTC_address(reg)))
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#else
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#define NCR5380_read(reg) (readb(DTC_address(reg)))
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#define xNCR5380_read(reg) \
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(((unsigned char) printk("DTC : read register %d at address %p\n"\
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, (reg), DTC_address(reg))), readb(DTC_address(reg)))
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#define NCR5380_write(reg, value) do { \
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printk("DTC : write %02x to register %d at address %p\n", \
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(value), (reg), DTC_address(reg)); \
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writeb(value, DTC_address(reg));} while(0)
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#endif
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#define NCR5380_intr dtc_intr
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#define NCR5380_queue_command dtc_queue_command
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#define NCR5380_abort dtc_abort
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#define NCR5380_bus_reset dtc_bus_reset
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#define NCR5380_proc_info dtc_proc_info
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/* 15 12 11 10
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1001 1100 0000 0000 */
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#define DTC_IRQS 0x9c00
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#endif /* DTC3280_H */
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