History log of /drivers/scsi/NCR5380.h
Revision Date Author Comments (<<< Hide modified files) (Show modified files >>>)
f281233d3eba15fb225d21ae2e228fd4553d824a 16-Nov-2010 Jeff Garzik <jeff@garzik.org> SCSI host lock push-down

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>
/drivers/scsi/NCR5380.h
28424d3a503d43482a5537e556f7b7652d8e56d8 10-Sep-2007 Boaz Harrosh <bharrosh@panasas.com> [SCSI] NCR5380: Use scsi_eh API for REQUEST_SENSE invocation

- Use new scsi_eh_prep/restor_cmnd() for synchronous
REQUEST_SENSE invocation.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
/drivers/scsi/NCR5380.h
702809ce9b1e91400826ec2ff203c06fdad36034 23-May-2007 Andrew Morton <akpm@linux-foundation.org> [SCSI] ncr5380 warning fixes

squish these:

drivers/scsi/NCR5380.c:360: warning: 'phases' defined but not used
drivers/scsi/NCR5380.c:360: warning: 'phases' defined but not used
drivers/scsi/NCR5380.c:633: warning: 'NCR5380_print_options' defined but not used
drivers/scsi/NCR5380.c:708: warning: 'NCR5380_proc_info' defined but not used
drivers/scsi/NCR5380.c:360: warning: 'phases' defined but not used
drivers/scsi/NCR5380.c:579: warning: 'NCR5380_probe_irq' defined but not used
drivers/scsi/NCR5380.c:360: warning: 'phases' defined but not used
drivers/scsi/NCR5380.c:708: warning: 'notyet_generic_proc_info' defined but not used
drivers/scsi/NCR5380.c:708: warning: 'notyet_generic_proc_info' defined but not used

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
/drivers/scsi/NCR5380.h
c4028958b6ecad064b1a6303a6a5906d4fe48d73 22-Nov-2006 David Howells <dhowells@redhat.com> WorkStruct: make allyesconfig

Fix up for make allyesconfig.

Signed-Off-By: David Howells <dhowells@redhat.com>
/drivers/scsi/NCR5380.h
7d12e780e003f93433d49ce78cfedf4b4c52adc5 05-Oct-2006 David Howells <dhowells@redhat.com> IRQ: Maintain regs pointer globally rather than passing to IRQ handlers

Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.

(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.

(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
/drivers/scsi/NCR5380.h
3471c288036bf0835a82d0b1bbce2002f6e68390 28-May-2005 Jeff Garzik <jgarzik@pobox.com> [SCSI] Remove no-op implementations of SCSI EH hooks

Drivers need not implement a hook that returns FAILED, and does nothing
else, since the SCSI midlayer code will do that for us.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
/drivers/scsi/NCR5380.h
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 17-Apr-2005 Linus Torvalds <torvalds@ppc970.osdl.org> Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
/drivers/scsi/NCR5380.h