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: NDavid Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)

open-iSCSI driver for Qlogic Corporation's iSCSI HBAs
Signed-off-by: NRavi Anand <ravi.anand@qlogic.com>
Signed-off-by: NDavid Somayajulu <david.somayajulu@qlogic.com>
Signed-off-by: NDoug Maxey <dwm@bubba.enoyolf.org>
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Signed-off-by: NJeff Garzik <jeff@garzik.org>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

- handle clear_user() error

- handle and properly unwind from sysfs errors thrown during mod init

- adjust order of calls in megasas_exit() to precisely match
  registration order in megasas_init()
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Updated for extra attribute and
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Handle and unwind from errors returned by driver model functions.
Signed-off-by: NJeff Garzik <jeff@garzik.org>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

- Notice and handle sysfs errors in module init, tape init

- Properly unwind errors in module init

- Remove bogus st_sysfs_class==NULL test, it is guaranteed !NULL at that point
Signed-off-by: NJeff Garzik <jeff@garzik.org>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

- Properly handle and unwind errors in init_sd().  Fixes leaks on error,
  if class_register() or scsi_register_driver() failed.

- Ensure that exit_sd() execution order is the perfect inverse of
  initialization order.

FIXME:  If some-but-not-all register_blkdev() calls fail, we wind up
calling unregister_blkdev() for block devices we did not register.
This was a pre-existing bug.
Signed-off-by: NJeff Garzik <jeff@garzik.org>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

- check all sysfs-related return codes, and propagate them back to callers

- properly unwind errors in osst_probe(), init_osst().  This fixes a
  leak that occured if scsi driver registration failed, and fixes an
  oops if sysfs creation returned an error.

(unrelated)
- kzalloc() cleanup in new_tape_buf()
Signed-off-by: NJeff Garzik <jeff@garzik.org>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Remove the obsolete hosts.h file under drivers/scsi.
Signed-off-by: NHenrik Kretzschmar <henne@nachtwindheim.de>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Changes the obsolete Scsi_Cmnd to struct scsi_cmnd in aic7xxx_old.c.
Also replacing lots of whitespaces with tabs in structures and functions
which have been changed.
Signed-off-by: NHenrik Kretzschmar <henne@nachtwindheim.de>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

This patch sets timeout of max 180 seconds for ioctl completion.
It also updates the Changelog and hikes the version to 3.05.
Signed-off-by: NSumant Patro <Sumant.Patro@lsil.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

This patch adds a tasklet for command completion.
Signed-off-by: NSumant Patro <Sumant.Patro@lsil.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

This patch adds function to print the pending frame details before returning
failure from the reset routine. It also exposes a new variable megasas_dbg_lvl
that allows the user to set the debug level for logging.
Signed-off-by: NSumant Patro <Sumant.Patro@lsil.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

This patch adds function pointer to invoke disable interrupt for
xscale and ppc IOP based controllers. Removes old implementation that checks
for controller type in megasas_disable_intr.
Signed-off-by: NSumant Patro <Sumant.Patro@lsil.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

This patch removes duplicated code in frame calculation &  adds
megasas_get_frame_count() that also takes into account the number of frames
that can be contained in the Main frame.
FW uses the frame count to pull sufficient number of frames from host memory.
Signed-off-by: NSumant Patro <Sumant.Patro@lsil.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

This patch has the following enhancements :
        a. handles new transition states of FW to support controller hotplug.
        b. It reduces by 1 the maximum cmds that the driver may send to FW.
        c. Sends "Stop Processing" cmd to FW before returning failure from reset routine
        d. Adds print in megasas_transition routine
        e. Sends "RESET" flag to FW to do a soft reset of controller
to move from Operational to Ready state.
	f. Sending correct pointer (cmd->sense) to pci_pool_free
Signed-off-by: NSumant Patro <Sumant.Patro@lsil.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

kbuild explicitly includes this at build time.
Signed-off-by: NDave Jones <davej@redhat.com>

Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Stall error handler if attempting recovery while an rport is
blocked.  This avoids device offline scenarios due to errors in
the error handler.

Reference implementation from lpfc/mptfc.
Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

The system hostname will be used during a subsequent FDMI registration
with the fabric.
Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Refactored original code from qla_gs.c:qla2x00_rsnn_nn().
Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

iIDMA (Intelligent Interleaved Direct Memory Access) allows for
the HBA hardware to send FC frames at the rate at which they can
be received by a target device.  By taking advantage of the
higher link rate, the HBA can maximize bandwidth utilization in a
heterogeneous multi-speed SAN.

Within a fabric topology, port speed detection is done via a Name
Server command (GFPN_ID) followed by a Fabric Management command
(GPSC).  In an FCAL/N2N topology, port speed is based on the HBA
link-rate.
Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Changes the obsolete Scsi_Cmnd to struct scsi_cmnd in the arm subdir
of the scsi-subsys.
Signed-off-by: NHenrik Kretzschmar <henne@nachtwindheim.de>
Acked-by: NRussell King <rmk@arm.linux.org.uk>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Converts the obsolete Scsi_Cmnd to struct scsi_cmnd in the ips-driver.
Signed-off-by: NHenrik Kretzschmar <henne@nachtwindheim.de>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

Many files include the filename at the beginning, serveral used a wrong one.
Signed-off-by: NUwe Zeisberger <Uwe_Zeisberger@digi.com>
Signed-off-by: NAdrian Bunk <bunk@stusta.de>

Randy brought it to my attention that in proper english "can not" should always
be written "cannot". I donot see any reason to argue, even if I mightnot
understand why this rule exists.  This patch fixes "can not" in several
Documentation files as well as three Kconfigs.
Signed-off-by: NMatt LaPlante <kernel1@cyberdogtech.com>
Acked-by: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NAdrian Bunk <bunk@stusta.de>

Signed-off-by: NAdrian Bunk <bunk@stusta.de>

following an email from John Adams <johna@onevista.com> to me with a patch
to enable tmscsim to use blocks up to 1MB and a discussion on linux-scsi,
below is a patch to enable clustering for tmscsim. I made it switchable
with a module parameter, with default "enable" - in case somebody gets
problems with it. Unfortunately, I was not able to check if this alone
lets you use any bigger blocks with a tape, as my tape seems to only
support 1 block size - only "mt setblk 1" is successful, any other value
fails. OTOH, testing on a P-133 showed that enabling clustering alone
improves throughput by 10% and reduces CPU load by another 10%, so, seems
a worthy thing to do. As for setting max_sectors, that might become a
separate patch...
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

In some places, particularly drivers and __init code, the init utsns is the
appropriate one to use.  This patch replaces those with a the init_utsname
helper.

Changes: Removed several uses of init_utsname().  Hope I picked all the
	right ones in net/ipv4/ipconfig.c.  These are now changed to
	utsname() (the per-process namespace utsname) in the previous
	patch (2/7)

[akpm@osdl.org: CIFS fix]
Signed-off-by: NSerge E. Hallyn <serue@us.ibm.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Andrey Savochkin <saw@sw.ru>
Cc: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

When SCSI-2 they can support luns past 7 and sparse luns.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

support the report luns opcode
.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

This is from RHEL4. I do not have any info from our bugzilla. All
I could find was something like this thread
http://lkml.org/lkml/2005/1/7/346

Report lun for linux does not work. It may be our lun format code or
it may be the device. It is probably not worth it to add anything
special for this device, so the patch just adds BLIST_NOREPORTLUN.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

This is from RHEL4. This box can support
scsi2 and can also support BLIST_SPARSELUN | BLIST_LARGELUN.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

In scsi_execute_async()'s error path, a struct scsi_io_context
allocated with kmem_cache_alloc() is kfree()'d. Obviously
kmem_cache_free() should be used instead.
Signed-off-by: NArne Redlich <arne.redlich@xiranet.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

A new device (id 0x8650, nickname 'yosemite') support is added.
It's basically the same, except for following items:
- mapping of id and lun by firmware
- special handling for some commands in interrupt routine
- change of internal copy function for these special commands
- different reset handling code
- different shutdown notification command
Signed-off-by: NEd Lin <ed.lin@promise.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

The payload_sz field in struct req_msg is not big enough to indicate
the size of req_msg, as its type is u8.
It is confirmed that this field is not used by firmware, so cancel
it here.
Signed-off-by: NEd Lin <ed.lin@promise.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

this overrun was spotted by coverity (cid #1403).

If type == ARRAY_SIZE(scsi_device_types), we are off by one.
Signed-off-by: NEric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>