The task_collector mode (or "latency_injector", (C) Dan Willians) is an
optional I/O path in libsas that queues up scsi commands instead of
directly sending it to the hardware.  It generall increases latencies
to in the optiomal case slightly reduce mmio traffic to the hardware.

Only the obsolete aic94xx driver and the mvsas driver allowed to use
it without recompiling the kernel, and most drivers didn't support it
at all.

Remove the giant blob of code to allow better optimizations for scsi-mq
in the future.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Acked-by: NDan Williams <dan.j.williams@intel.com>

Remove dma_cache_sync call to fix build on other architectures.
Driver still works fine on x86 without that.
Signed-off-by: NOndrej Zary <linux@rainbow-software.org>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

The Report supported operation codes command is very closely integrated
into the table driven parser and very useful for testing it. Its cdb
masks form the basis of the 'strict' parameter's checks. The Report
supported TMFs command is a simple extension. The Compare and write
command may even be useful, as it should be atomic due to the read-write
lock that the driver uses on its backing store (ram).
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

The existing 'big switch' parser in queuecommand() is changed to
a table driven parser. The old and new queuecommand() were moved
in the source so diff would not shuffle them. Apart from the new
tables most other changes are refactoring existing response code
to be more easily called out of the table parser. The 'strict'
parameter is added so that cdb_s can be checked for non-zero
values in parts of the cdb that are reserved. Some other changes
include: tweak request sense response when D_SENSE differs; support
NDOB in Write Same(16); and fix crash in Get LBA Status when LBP
was inactive.
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Via sysfs the virtual_gb scsi_debug parameter can be changed while
LUs are in use. If that changes, the 'Capacity data has changed'
Unit Attention is queued on all LUs.
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

The way the existing scsi_debug command parser associated various
inject error flags to a command was difficult to replicate in the
table driven parser. This patch adds infrastructure to append those
flags to the end of a scsi_cmnd object with the cmd_size host
template option.
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Use Sense Key Specific field in the sense data of an ILLEGAL REQUEST
to optionally pinpoint the location of the problem field. This may
be either in the cdb or the associated parameter list.
Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Introduce wd719x, a driver for Western Digital WD7193, WD7197 and WD7296 PCI
SCSI controllers based on WD33C296A chip.
Tested with WD7193 card.
Signed-off-by: NOndrej Zary <linux@rainbow-software.org>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

The patch moves an error code assigment to a 'default' case
in the previous switch statement.
Signed-off-by: NTomas Henzl <thenzl@redhat.com>
Acked-by: NBradley Grove <bgrove@attotech.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Is seems strange to manipulate nvram_semaphore when in this place,
this patch fixes it.
Signed-off-by: NTomas Henzl <thenzl@redhat.com>
Acked-by: NBradley Grove <bgrove@attotech.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

This patch fixes an error path and rearranges error handling.
Signed-off-by: NTomas Henzl <thenzl@redhat.com>
Acked-by: NBradley Grove <bgrove@attotech.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

The am53c974 is a re-implementation of the tmscsim driver,
and provides the same functionality.
So remove the tmscsim driver and make am53c974 an alias to tmscsim.
Acked-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

CONFIG2_FENAB ('feature enable') changed definition between chip
revisions, from 'Latch SCSI Phase' to 'Latch SCSI Phase, display
chip ID upon reset, and enable 24 bit addresses'.
So only enable it for am53c974 where we know what it's doing.
Acked-by: NDavid S. Miller <davem@davemloft.net>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

On PCscsi, the FENAB configuration also enables 24-bit DMA
transfer lengths (and provides the chip id in TCHI after reset).
We want to be able to enable this parameter from the DMA driver.

Check if the caller of scsi_esp_register provided a value for esp->config2.
If this is the case, assume this is not an ESP100, skip the detection
phase and leave esp->config2 untouched.  It will be used in esp_reset_esp.
Reviewed-by: NHannes Reinecke <hare@suse.de>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

The am53c974 returns the same ID as the FAS236, but implements
things slightly differently. So detect the am53c974 by checking
for ESP_CONFIG4 register.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

The am53c974 has an design issue where a single byte might be
left in the SCSI FIFO after a DMA transfer.
As the handling code is currently untested add a WARN_ON()
statement here.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

This patch adds a new implementation for the Tekram DC-390T /
AMD AM53c974 SCSI controller, based on the generic
esp_scsi infrastructure.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Using DMA for command submission has the drawback that it might
generate additional DMA completion interrupts after the command
has been submitted to the device.
Additionally the am53c974 has a design flaw causing it
to generate spurious interrupts even though DMA completion
interrupts are not enabled.
This can be avoided by using the FIFO for command submission.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

A read to ESP_INTRPT will clear ESP_STATUS and ESP_SSTEP. So read
all status registers in one go to avoid losing information.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Add new debug definitions for event and command logging.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Use dev_printk functions for correct device annotations.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Add a field 'num_tags' to the esp structure to allow drivers
to overwrite the number of avialable tags if required.
Default is ESP_DEFAULT_TAGS.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Remove overly verbose debugging output that pokes into mid-layer internal
structures that looks like copy & paste from the mpt2/3 drivers.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Reviewed-by: NHannes Reinecke <hare@suse.de>

Merge two functions, and remove overly verbose debugging output that pokes
into mid-layer internal structures.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Reviewed-by: NHannes Reinecke <hare@suse.de>

Merge two functions, and remove overly verbose debugging output that pokes
into mid-layer internal structures.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Reviewed-by: NHannes Reinecke <hare@suse.de>

Drop the now unused reason argument from the ->change_queue_depth method.
Also add a return value to scsi_adjust_queue_depth, and rename it to
scsi_change_queue_depth now that it can be used as the default
->change_queue_depth implementation.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Reviewed-by: NHannes Reinecke <hare@suse.de>

We won't ever queue more commands than the host allows.  Instead of
letting drivers either reject or ignore this case handle it in
common code.  Note that various driver use internal constant or
variables that are assigned to both shost->can_queue and checked
in ->change_queue_depth - I did remove those checks as well.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Reviewed-by: NHannes Reinecke <hare@suse.de>

All drivers use the implementation for ramping the queue up and down, so
instead of overloading the change_queue_depth method call the
implementation diretly if the driver opts into it by setting the
track_queue_depth flag in the host template.

Note that a few drivers validated the new queue depth in their
change_queue_depth method, but as we never go over the queue depth
set during slave_configure or the sysfs file this isn't nessecary
and can safely be removed.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Reviewed-by: NVenkatesh Srinivas <venkateshs@google.com>

James Smart said the userspace to consume these events never emerged.  Given
that these get in the way of the following patches remove support for them.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Acked-by: NJames Smart <james.smart@emulex.com>

Do not process any SCSI and IOCTL command further (return them with
appropriate return values to callers), while driver removal is in
progress or PCI shutdown is invoked.
Signed-off-by: NSumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: NKashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

This patch addresses few endianness related bug fixes.
Signed-off-by: NSumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: NKashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Corrected wait_event() call which was waiting for wrong completion
status (0xFF).
Signed-off-by: NSumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: NKashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

In OCR(Online Controller Reset) path, driver sets adapter state to
MEGASAS_HBA_OPERATIONAL before getting new RAID map.  There will be a small
window where IO will come from OS with old RAID map. This patch will update
adapter state to MEGASAS_HBA_OPERATIONAL, only after driver has new RAID
map to avoid any IOs getting build using old RAID map.
Signed-off-by: NSumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: NKashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

In OCR (Online Controller Reset) path, driver sets adapter state to
MEGASAS_HBA_OPERATIONAL before getting new RAID map.  There will be a small
window where IO will come from OS with old RAID map.  This patch will
update adapter state to MEGASAS_HBA_OPERATIONAL, only after driver has new
RAID map to avoid any IOs getting build using old RAID map.
Signed-off-by: NSumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: NKashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Update MAINTAINERS list and copyright information for megaraid_sas driver.
Signed-off-by: NSumit Saxena <sumit.saxena@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Update driver version and remove some meta data (release date and extended
version) about megaraid_sas driver.
Signed-off-by: NSumit Saxena <sumit.saxena@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

This patch also removes unnecessary printk(KERN_INFO
Signed-off-by: NFabian Frederick <fabf@skynet.be>
Acked-by: NAnil Gurumurthy <anil.gurumurthy@qlogic.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

Since virtio_scsi has supported multi virtqueue already,
it is natural to map the virtque to hw-queue of blk-mq.
Signed-off-by: NMing Lei <ming.lei@canonical.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

It is already using atomic test_and_set_bit to do the
allocation.

There is some microscopic chance of starvation, but it is
so microscopic that it should never happen in reality.
Signed-off-by: NDon Brace <don.brace@pmcs.com>
Reviewed-by: NWebb Scales <webbnh@hp.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>