mirror of https://gitee.com/openkylin/linux.git
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> |
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| README | ||
| README.ioctl | ||
| bus-osm.c | ||
| config-osm.c | ||
| core.h | ||
| debug.c | ||
| device.c | ||
| driver.c | ||
| exec-osm.c | ||
| i2o_block.c | ||
| i2o_block.h | ||
| i2o_config.c | ||
| i2o_proc.c | ||
| i2o_scsi.c | ||
| iop.c | ||
| memory.c | ||
| pci.c | ||
README
Linux I2O Support (c) Copyright 1999 Red Hat Software
and others.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version
2 of the License, or (at your option) any later version.
AUTHORS (so far)
Alan Cox, Building Number Three Ltd.
Core code, SCSI and Block OSMs
Steve Ralston, LSI Logic Corp.
Debugging SCSI and Block OSM
Deepak Saxena, Intel Corp.
Various core/block extensions
/proc interface, bug fixes
Ioctl interfaces for control
Debugging LAN OSM
Philip Rumpf
Fixed assorted dumb SMP locking bugs
Juha Sievanen, University of Helsinki Finland
LAN OSM code
/proc interface to LAN class
Bug fixes
Core code extensions
Auvo Häkkinen, University of Helsinki Finland
LAN OSM code
/Proc interface to LAN class
Bug fixes
Core code extensions
Taneli Vähäkangas, University of Helsinki Finland
Fixes to i2o_config
CREDITS
This work was made possible by
Red Hat Software
Funding for the Building #3 part of the project
Symbios Logic (Now LSI)
Host adapters, hints, known to work platforms when I hit
compatibility problems
BoxHill Corporation
Loan of initial FibreChannel disk array used for development work.
European Comission
Funding the work done by the University of Helsinki
SysKonnect
Loan of FDDI and Gigabit Ethernet cards
ASUSTeK
Loan of I2O motherboard
STATUS:
o The core setup works within limits.
o The scsi layer seems to almost work.
I'm still chasing down the hang bug.
o The block OSM is mostly functional
o LAN OSM works with FDDI and Ethernet cards.
TO DO:
General:
o Provide hidden address space if asked
o Long term message flow control
o PCI IOP's without interrupts are not supported yet
o Push FAIL handling into the core
o DDM control interfaces for module load etc
o Add I2O 2.0 support (Deffered to 2.5 kernel)
Block:
o Multiple major numbers
o Read ahead and cache handling stuff. Talk to Ingo and people
o Power management
o Finish Media changers
SCSI:
o Find the right way to associate drives/luns/busses
Lan:
o Performance tuning
o Test Fibre Channel code
Tape:
o Anyone seen anything implementing this ?
(D.S: Will attempt to do so if spare cycles permit)