The session lock is taken in threads, timers, and bottom halves
like softirqs and tasklets. All the code but
iscsi_conn/session_failure take the session lock with the spin_lock_bh
call. This was done because I thought some offload drivers
would be calling these functions from a irq. They never did,
so this patch has iscsi_conn/session_failure use the bh
locking.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

iscsi_tcp, ib_iser, cxgb*, be2iscsi and bnx2i do not use
the host lock and do not take the session lock against
a irq, so this patch drops the DEF_SCSI_QCMD use. Instead
we just take the session lock and disable bhs.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

If alloc_pdu fails then the task->hdr pointer may not be
set. This adds a check for this case in the cleanup callback.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

The pdu allication callout is called from a spin lock
and in the IO path so we cannot use GFP_KERNEL. This
has the driver use GFP_ATOMIC.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

This adds a more informative error code and message
for the iscsi scsi eh session drop paths. This allows
you to distinguish if the session was dropped due to
a connection failure vs the iscsi layer dropping
the session due to scsi eh failure processing.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Add missing call to gdth_ioctl_free before aborting.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression buf,ha,len,addr,E;
@@

buf = gdth_ioctl_alloc(ha, len, FALSE, &addr)
... when != false buf != NULL
    when != true buf == NULL
    when != \(E = buf\|buf = E\)
    when != gdth_ioctl_free(ha, len, buf, addr)
*return ...;
// </smpl>
Signed-off-by: NJulia Lawall <julia@diku.dk>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

This patch removes unused functions, data strucutres, and definitions.  It
also includes misc comment and formatting cleanups.
Signed-off-by: NJing Huang <huangj@brocade.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

This patch removes some inactive functions and macros.
Signed-off-by: NJing Huang <huangj@brocade.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Signed-off-by: NJing Huang <huangj@brocade.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Signed-off-by: NGiridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Signed-off-by: NGiridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Signed-off-by: NGiridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

The semantics we employ now in the driver, performing a
BIG_HAMMER in the event of Get-ID (0x20) mailbox command
failing, should only be done for FC.  On FC configurations, it
makes sense since advertising is only really performed once,
so a BIG_HAMMER to reinitiate the process is needed to
restart.  Under FCoE, this is not needed, as there's a
continous stream of advertisements/ACks at the protocol layer
to initiate a relogin/reinitialization process.
Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

For driver module parameters that have permission bits set to
(S_IRUGO|S_IRUSR), remove the second term since it is already
included in the first term.

S_IRUGO comes defined as (S_IRUSR|S_IRGRP|S_IROTH).
Signed-off-by: NJoe Carnuccio <joe.carnuccio@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Signed-off-by: NGiridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: NLalit Chandivade <lalit.chandivade@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Signed-off-by: NSwapnil Nagle <swapnil.nagle@qlogic.com>
Signed-off-by: NKaren Higgins <karen.higgins@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

The FCP priority info was not being updated properly in certain situations.
Here are the changes that needs to be done to take care of this issue:
1. No need to check fcport->state for FCS_UNCONFIGURED in
qla24xx_update_fcport_fcp_prio(), since an invalid loop id check is
already performed which is sufficient.
2. Add the missing qla24xx_update_fcport_fcp_prio() function call
within qla2x00_update_fcport() function, so that the priority info
is updated on every port addition or change.
3. Perform proper adapter types checking.
4. Other changes, associated with DEBUG/printk's and parameter passing.
Signed-off-by: NSaurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NGiridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Fixed the incorrect zero test on array new_config[].
Signed-off-by: NJoe Carnuccio <joe.carnuccio@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

This is just a cleanup.

The unneeded NULL check annoys static checkers because we already
derefenced it and the we check it and then (if it's not the _safe()
version) we dereference it again without checking.  And the static
checker is all, "Wah?  Is it null or not?"
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Support is added for quiescence mode. This feature is for P3P
adapters. Any of the functions can put the firmware into quiescence
state. All the others have to ack that request. During quiescence mode
current commands are processed and all the new incoming I/Os are
blocked. Loop resync is performed after firmware comes out of
quiescence state.
Signed-off-by: NSaurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: NMadhuranath Iyengar <Madhu.Iyengar@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

The following patch updates the
Documentation/scsi/ChangeLog.megaraid_sas file.
Signed-off-by: NAdam Radford <aradford@gmail.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

This patch adds MegaRAID 9265/9285 (Device id 0x5b) specific code
Signed-off-by: NAdam Radford <aradford@gmail.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

The following patch adds struct megasas_instance_template changes to
the megaraid_sas driver, and changes all code to use the new instance
entries:

   irqreturn_t (*service_isr )(int irq, void *devp);
   void (*tasklet)(unsigned long);
   u32 (*init_adapter)(struct megasas_instance *);
   u32 (*build_and_issue_cmd) (struct megasas_instance *, struct scsi_cmnd *);
   void (*issue_dcmd) (struct megasas_instance *instance,
                              struct megasas_cmd *cmd);
Signed-off-by: NAdam Radford <aradford@gmail.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

The following patch modifies the megaraid_sas driver to select the
lowest memory bar available so the driver will work in SR-IOV VF
environments where the memory bar mapping changes.
Signed-off-by: NAdam Radford <aradford@gmail.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

This patch adds MSI-X support and 'msix_disable' module parameter to
the megaraid_sas driver.
Signed-off-by: NAdam Radford <aradford@gmail.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Modify allocation to try the minimum possible page order allowed by the HBA
scatter/gather segment limit in allocation of the driver's internal
buffer. This increases the probability of successful allocation. The
allocation may still fail if this minimum order is > 0.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: NKai Makisara <kai.makisara@kolumbus.fi>
Reported-by: NLukas Kolbe <lkolbe@techfak.uni-bielefeld.de>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

The order of the pages allocated for the driver buffer must be stored before
allocation because it is used in freeing already allocated pages if
allocation fails.
Signed-off-by: NKai Makisara <kai.makisara@kolumbus.fi>
Reported-by: NLukas Kolbe <lkolbe@techfak.uni-bielefeld.de>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

set resid to the requested data-in length when a MEDIUM ERROR is
simulated. This implies no valid data is returned in the data-in
buffer
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Our current handling of medium error assumes that data is returned up
to the bad sector.  This assumption holds good for all disk devices,
all DIF arrays and most ordinary arrays.  However, an LSI array engine
was recently discovered which reports a medium error without returning
any data.  This means that when we report good data up to the medium
error, we've reported junk originally in the buffer as good.  Worse,
if the read consists of requested data plus a readahead, and the error
occurs in readahead, we'll just strip off the readahead and report
junk up to userspace as good data with no error.

The fix for this is to have the error position computation take into
account the amount of data returned by the driver using the scsi
residual data.  Unfortunately, not every driver fills in this data,
but for those who don't, it's set to zero, which means we'll think a
full set of data was transferred and the behaviour will be identical
to the prior behaviour of the code (believe the buffer up to the error
sector).  All modern drivers seem to set the residual, so that should
fix up the LSI failure/corruption case.
Reported-by: NDouglas Gilbert <dgilbert@interlog.com>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

This patch adds a handful of missing CDBs defs that are used by TCM
persistent reservation logic in the SPC-4 defined CDB exclusion table for
registrations and reservations.

This includes a number of missing MI_* and MO_* prefixed service actions defs
for MAINTENANCE_IN and MAINTENANCE_OUT that are mentioned wrt to persistent
registration and reservation status for the SCSI Initiator Port.
Signed-off-by: NNicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

This patch updates the GPL headers in megaraid_sas_base.c and megaraid_sas.h.
Signed-off-by: NAdam Radford <aradford@gmail.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

This patch renames megaraid_sas.c to megaraid_sas_base.c to facilitate
other files in the compile.
Signed-off-by: NAdam Radford <aradford@gmail.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

It seems that zero should be returned if scsi_target_is_busy(starget) is
true, no matter if sdev is on the starved list.
Signed-off-by: NHillf Danton <dhillf@gmail.com>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Currently, when scsi_dh_activate() returns with an error
(e.g. SCSI_DH_NOSYS) the activate_complete callback is not called and
the error is not propagated to DM mpath.

When a SCSI device attached to a device handler is deleted, userland
processes currently performing I/O on the device will have their I/O
hang forever.

- Set SCSI_DH_NOSYS error when the handler is in the process of being
  deleted (e.g. the SCSI device is in a SDEV_CANCEL or SDEV_DEL state).

- Set SCSI_DH_DEV_OFFLINED error when device is in SDEV_OFFLINE state.

- Call the activate_complete callback function directly from
  scsi_dh_activate if an error has been set (when either the scsi_dh
  internal data has already been deleted or is in the process of being
  deleted).

The patch was tested in an iSCSI environment, RDAC H/W handler and
multipath.  In the following reproduction process, dd will I/O hang
forever and the only way to release it will be to reboot the machine:
1) Perform I/O on a multipath device:
    dd if=/dev/dm-0 of=/dev/zero bs=8k count=1000000 &
2) Delete all slave SCSI devices contained in the mpath device:
   I)  In an iSCSI environment, the easiest way to do this is by
   stopping iSCSI:
       /etc/init.d/iscsi stop
   II) Another way to delete the devices is by applying the following
   bash scriptlet:
       dm_devs=$(ls /sys/block/ | grep dm- | xargs)
       for dm_dev in $dm_devs; do
         devices=$(ls /sys/block/$dm_dev/slaves)
         for device in $devices; do
            echo 1 > /sys/block/$device/device/delete
         done
       done

NOTE: when DM mpath's fail_path uses blk_abort_queue this scsi_dh change
isn't strictly required.  However, DM mpath's call to blk_abort_queue
will soon be reverted because it has proven to be unsafe due to a race
(between blk_abort_queue and scsi_request_fn) that can lead to list
corruption.  Therefore we cannot rely on blk_abort_queue via fail_path,
but even if we could this scsi_dh change is still preferrable.
Signed-off-by: NMenny Hamburger <Menny_Hamburger@Dell.com>
Signed-off-by: NMike Snitzer <snitzer@redhat.com>
Reviewed-by: NBabu Moger <babu.moger@lsi.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Otherwise, after doing a RAID level migration, the disk will be
disruptively removed and re-added as a different disk on rescan.
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

The firmware may have been updated, in which case, it's the same device,
and in that case, we do not want to remove and add the device, we want to
let it continue as is.
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

Signed-off-by: NAlex Iannicelli <alex.iannicelli@emulex.com>
Signed-off-by: NJames Smart <james.smart@emulex.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>