The PAPR defines four valid header values for the first byte of a CRQ
message. Namely, an unused/empty message (0x00), a valid
command/response entry (0x80), a valid initialization entry (0xC0), and
a valid transport event (0xFF). Further, initialization responses have
two formats namely initialize (0x01) and initialize complete
(0x02). Define these values as enums and use them in the code in
place of their magic number equivalents.
Signed-off-by: NTyrel Datwyler <tyreld@linux.vnet.ibm.com>
Reported-by: NJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: NManoj Kumar <manoj@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The enum values for VIOSRP_LINUX_FORMAT and VIOSRP_INLINE_FORMAT are off
by one. They are currently defined as 0x06 and 0x07 respetively.  These
values are defined in PAPR correctly as 0x05 and 0x06. This
inconsistency has gone unnoticed as neither enum is currently used.  The
possible future support of PING messages between the VIOS and client
adapter relies on VIOSRP_INLINE_FORMAT crq messages.  Corrected these
enum values to match PAPR definitions.
Signed-off-by: NTyrel Datwyler <tyreld@linux.vnet.ibm.com>
Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: NManoj Kumar <manoj@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

mpt3sas: Remove cpumask_clear for zalloc_cpumask_var and don't free free_cpu_mask_var before reply_q

Removed cpumask_clear as it is not required for zalloc_cpumask_var and
free free_cpumask_var before freeing reply_q.
Signed-off-by: NSuganath prabu Subramani <suganath-prabu.subramani@broadcom.com>
Signed-off-by: NChaitra P B <chaitra.basappa@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Several functions in lpfc have comments stating that the function must
be called with the hbalock (or hostlock, or ringlock) held. Add
lockdep_assert_held() annotations to these functions, so one can
actually verify the locks are held.
Signed-off-by: NJohannes Thumshirn <jthumshirn@suse.de>
Acked-by: NDick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

__bfa_trc() compiles to 115 bytes of machine code.
With this .config: http://busybox.net/~vda/kernel_config
there are 1494 calls of __bfa_trc().

__bfa_trc32() is very similar, so it is uninlined too.
However, it appears to be unused, therefore this patch
ifdefs it out.

Change in code size is about 130,000 bytes:

    text     data      bss       dec     hex filename
85975426 22294712 20627456 128897594 7aed23a vmlinux.before
85842882 22294584 20627456 128764922 7accbfa vmlinux

[mkp: Removed unused __bfa_trc32()]
Signed-off-by: NDenys Vlasenko <dvlasenk@redhat.com>
Acked-by: NAnil Gurumurthy <anil.gurumurthy@qlogic.com>
CC: Fabian Frederick <fabf@skynet.be>
CC: Anil Gurumurthy <anil.gurumurthy@qlogic.com>
CC: Christoph Hellwig <hch@lst.de>
CC: Guenter Roeck <linux@roeck-us.net>
CC: Ben Hutchings <ben@decadent.org.uk>
CC: James Bottomley <JBottomley@Parallels.com>
CC: linux-kernel@vger.kernel.org
CC: linux-scsi@vger.kernel.org
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Modify ppa driver to use the new parallel port device model.
Signed-off-by: NSudip Mukherjee <sudip@vectorindia.org>
Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

We are getting build warning about:
 "Section mismatch in reference from the variable sim710_eisa_driver to
 the function .init.text:sim710_eisa_probe()
 The variable sim710_eisa_driver references the function __init
 sim710_eisa_probe()"

sim710_eisa_probe() was having __init but that was being referenced from
sim710_eisa_driver.
Signed-off-by: NSudip Mukherjee <sudip@vectorindia.org>
Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

In case of error, the memory allocated for phwi_ctrlr was not freed.
Signed-off-by: NMaurizio Lombardi <mlombard@redhat.com>
Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: NJitendra Bhivare <jitendra.bhivare@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

[mkp: Only one typo remained]
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

QUERY_DESC_GEOMETRY_MAZ_SIZE
QUERY_DESC_GEOMETRY_MAX_SIZE
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Sometimes queries from the device might return a failure so it is
recommended to retry sending the query, before giving up.  This change
adds a wrapper to retry sending a query attribute, in cases where we
need to wait longer, before we continue, or before reporting a failure.
Reviewed-by: NGilad Broner <gbroner@codeaurora.org>
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add a write memory barrier to make sure descriptors prepared are
actually written to memory before ringing the doorbell. We have also
added the write memory barrier after ringing the doorbell register so
that controller sees the new request immediately.
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NGilad Broner <gbroner@codeaurora.org>
Signed-off-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Performing several writes to UFS host controller registers has no
guarantee of ordering, so we must make sure register writes to setup
request list base address etc. are performed before the run/stop
register is enabled.  In addition, when setting up a task request, we
must make sure the updating of descriptors takes places before ringing
the doorbell, similarly to setting up a transfer request.
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NGilad Broner <gbroner@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

DME commands such as Hibern8 enter/exit and gear switch generate 2
completion interrupts, one for confirmation that command is received by
local UniPro and 2nd one is the final confirmation after communication
with remote UniPro. Currently both of these completions are registered
as interrupt events which is not quite necessary and instead we can just
wait for the interrupt of 2nd completion, this should reduce the number
of interrupts and could reduce the unnecessary CPU wakeups to handle
extra interrupts.
Reviewed-by: NGilad Broner <gbroner@codeaurora.org>
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

UFS flag query requests may fail sometimes due to timeouts etc.  Add a
wrapper function to retry up to 10 times in case of such failure,
similar to retries being made for attribute queries.
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NGilad Broner <gbroner@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Hibern8 exit can be called from 3 different contexts:
    - ufshcd_hibern8_exit_work
    - ufshcd_ungate_work
    - runtime/system resume

If hibern8 exit fails for some reason then we try to bring the link to
active state by link startup but this recovery mechanism results into
deadlock or errors from first 2 context listed above. This change fixes
the recovery by adding proper error handling mechanism.
Reviewed-by: NGilad Broner <gbroner@codeaurora.org>
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

If hibern8 enter command fails then UFS link state may be unknown which
may result into timeout of all the commands issued after failure.

This change does 2 things (for pre-defined number of retry counts) after
hibern8 enter failure:

1. Recovers the UFS link to active state

2. If link is recovered to active state, tries to put the UFS link in
   hibern8 enter again until retry count expires.
Reviewed-by: NGilad Broner <gbroner@codeaurora.org>
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The dme_peer get/set attribute commands are prone to errors, therefore
we add three retries for the UIC command sending.  Error code returned
from ufshcd_send_uic_cmd() is checked, and unless it was successful or
the retries have finished, another command will be sent.
Reviewed-by: NGilad Broner <gbroner@codeaurora.org>
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NLee Susman <lsusman@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

If device raises the exception event in the response to the commands
sent during the runtime/system PM callbacks, exception event handler
might run in parallel with PM callbacks and may see unclocked register
accesses. This change fixes this issue by not scheduling the exception
event handler while PM callbacks are running.
Reviewed-by: NGilad Broner <gbroner@codeaurora.org>
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

fDeviceInit query response time for some devices is too long that
default query request timeout of 100ms may not be enough. Experiments
show that fDeviceInit response sometimes takes 500ms so to be on safer
side this change sets the timeout to 600ms. Without this change, we
might unnecessarily have to retry fDeviceInit query requests multiple
times and each query request timeout prints one error message.
Reviewed-by: NGilad Broner <gbroner@codeaurora.org>
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

When sending a query to the device returns with a timeout error, we
clear the corresponding bit in the DOORBELL register but we don't clear
the outstanding_request field as we should.  This patch fixes this bug.
Reviewed-by: NSubhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: NGilad Broner <gbroner@codeaurora.org>
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

A race condition appear to exist between request completion when
scsi_done() is called to end the request and set the tag back to -1 (at
blk_queue_end_tag() scsi_end_request), and scsi layer error handling
which aborts the command and reuses it to request sense data. Sending
the request sense is done with tag which was set to -1 and so it is
invalid.  Assert command tag passed from scsi layer is valid.
Reviewed-by: NSubhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NGilad Broner <gbroner@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Some of the data structures (like response UPIU) and/or its elements
(unused fields) should be cleared before sending out the respective
command to UFS device.

This change clears the UPIU response data structure for query commands
and NOP command before sending out the command. We also initialize the
PRDT table length to zero which should take care of commands which
doesn't have any data associated with it. We are also clearing the
unused fields in request UPIU for NOP command.
Reviewed-by: NGilad Broner <gbroner@codeaurora.org>
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Tested-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Clear the UFS data structures before sending new request.

The SCSI command is sent to the device within the UFS UPIU request.
As part of the transfer UPIU preparation, the SCSI command is copied
to the UPIU structure according to the SCSI command size.
As different SCSI commands differ in size from each other, we need
to clear the whole SCSI command field to prevent sending uninitialized
data to the device.

The UPIU response doesn't always include the sense data and can differ
in size.
Hence, the UPIU response should also be cleared before the transfer.
Reviewed-by: NGilad Broner <gbroner@codeaurora.org>
Reviewed-by: NDolev Raviv <draviv@codeaurora.org>
Signed-off-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NMaya Erez <merez@codeaurora.org>
Signed-off-by: NYaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

When the scsi_dh core was moved into the scsi core module,
CONFIG_SCSI_DH became a 'bool' option, and now anything depending on it
can be built-in even when CONFIG_SCSI=m. This of course cannot link
successfully:

drivers/scsi/built-in.o: In function `rdac_init':
scsi_dh_alua.c:(.init.text+0x14): undefined reference to `scsi_register_device_handler'
scsi_dh_alua.c:(.init.text+0x64): undefined reference to `scsi_unregister_device_handler'
drivers/scsi/built-in.o: In function `alua_init':
scsi_dh_alua.c:(.init.text+0xb0): undefined reference to `scsi_register_device_handler'

As a workaround, this adds an extra dependency on CONFIG_SCSI, so
Kconfig can figure out whether built-in is allowed or not.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Fixes: 086b91d0 ("scsi_dh: integrate into the core SCSI code")
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Gcc incorrectly detects that two variables in aha1542_queuecommand might
be used without an initialization:

scsi/aha1542.c: In function 'aha1542_queuecommand':
scsi/aha1542.c:382:16: error: 'cptr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
scsi/aha1542.c:379:11: error: 'sg_count' may be used uninitialized in this function [-Werror=maybe-uninitialized]

The only user of these is doing the same check that the assigment has,
so it is actually guaranteed to work. Adding an "else" clause with a
fake initialization shuts up the warning.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The qla4_83xx_rd_reg_indirect() function can fail when it is unable to
read a register, but not all callers check its return value before using
the register data, and gcc correctly warns about this:

qla4xxx/ql4_83xx.c: In function 'qla4_83xx_process_reset_template':
qla4xxx/ql4_83xx.c:1073:36: warning: 'value' may be used uninitialized in this function
     ha->reset_tmplt.array[index++] = value;
                                    ^
qla4xxx/ql4_83xx.c:1050:11: note: 'value' was declared here
  uint32_t value;
           ^
qla4xxx/ql4_83xx.c:902:8: warning: 'value' may be used uninitialized in this function
  value &= p_rmw_hdr->test_mask;
        ^
qla4xxx/ql4_83xx.c:895:11: note: 'value' was declared here
  uint32_t value;
           ^
In file included from ../include/linux/io.h:25:0,
                 from ../include/linux/pci.h:31,
                 from ../drivers/scsi/qla4xxx/ql4_def.h:16,
                 from ../drivers/scsi/qla4xxx/ql4_83xx.c:10:
asm/io.h:101:2: warning: 'value' may be used uninitialized in this function
  asm volatile("str %1, %0"
  ^
qla4xxx/ql4_83xx.c:874:11: note: 'value' was declared here
  uint32_t value;
           ^

Unfortunately, I don't see any helpful way to add proper error handling
for this case, and the failure scenario for rd_reg seems rather obscure,
so this bails out and makes the rd_reg accessor set the result to
0xffffffff so we at least get a predictable value.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NNilesh Javali <nilesh.javali@qlogic.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

We get a warning for the fas216 driver when it is compiled as a loadable
module, as the __setup() functions are never called then:

scsi/arm/fas216.c:101:19: warning: 'fas216_log_setup' defined but not used [-Wunused-function]
 static int __init fas216_log_setup(char *str)

This adds an #ifndef MODULE around the definition to shut up the warning
and clarify for the reader when it is used or not.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The calc_sync_xfer function is only used if CONFIG_SCSI_ACORNSCSI_SYNC
is set, otherwise we get a compiler warning:

scsi/arm/acornscsi.c:680:15: warning: 'calc_sync_xfer' defined but not used [-Wunused-function]
 unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)

This marks the function as __maybe_unused to shut up the warning and
silently drop the function in the object code when there is no caller.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The seq_mpt_print_ioc_summary function is used for the
/proc/mpt/iocN/summary implementation and never gets called when
CONFIG_PROC_FS is disabled:

drivers/message/fusion/mptbase.c:6851:13: warning: 'seq_mpt_print_ioc_summary' defined but not used [-Wunused-function]
 static void seq_mpt_print_ioc_summary(MPT_ADAPTER *ioc, struct seq_file *m, int showlan)

This adds an #ifdef to hide the function definition in that case and
avoid the warning.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The fdomain SCSI host driver is one of the last remaining drivers that
manually search the PCI bus using pci_get_device rather than registering
a pci_driver instance.

This means the module device table is unused when the driver is
built-in, and we get a warning about it:

drivers/scsi/fdomain.c:1773:29: warning: 'fdomain_pci_tbl' defined but not used [-Wunused-variable]

To avoid the warning, this adds another #ifdef around the table
definition.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

A barrier should be added to ensure proper ordering of memory mapped
writes.
Signed-off-by: NTomas Henzl <thenzl@redhat.com>
Reviewed-by: NKashyap Desai <kashyap.desai@broadcom.com>
Acked-by: NKashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This removes a redundant code block that will either be executed if the
ENABLE_FCP_RING_POLLING flag is set in phba->cfg_poll or not. The code
is just duplicated in both cases, hence we unify it again.

This probably is a left over from some sort of refactoring.
Signed-off-by: NJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: NMatthew R. Ochs <mrochs@linux.vnet.ibm.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Reviewed-by: NSebastian Herbszt <herbszt@gmx.de>
Acked-by: NDick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Bump mpt3sas driver version from 09.102.00.00 to 12.100.00.00
Signed-off-by: NSuganath prabu Subramani <suganath-prabu.subramani@avagotech.com>
Signed-off-by: NChaitra P B <chaitra.basappa@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Track msix of each IO and use the same msix for issuing abort to timed
out IO. With this driver will process IO's reply first followed by TM.
Signed-off-by: NSuganath prabu Subramani <suganath-prabu.subramani@avagotech.com>
Signed-off-by: NChaitra P B <chaitra.basappa@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Updated MPI version and MPI header files.
Signed-off-by: NSuganath prabu Subramani <suganath-prabu.subramani@avagotech.com>
Signed-off-by: NChaitra P B <chaitra.basappa@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Added support for configurable Chain Frame Size. Calculate the
Chain Message Frame size from the IOCMaxChainSegementSize (iocfacts).
Applicable only for mpt3sas/SAS3.0 HBA's.
Signed-off-by: NSuganath prabu Subramani <suganath-prabu.subramani@avagotech.com>
Signed-off-by: NChaitra P B <chaitra.basappa@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Module parameter to enable/disable configuring affinity hint for msix
vector.  SMP affinity feature can be enabled/disabled by setting module
parameter "smp_affinity_enable" to 1/0.  By default this feature is
enabled. (smp_affinity_enable = 1 enabled).
Signed-off-by: NSuganath prabu Subramani <suganath-prabu.subramani@avagotech.com>
Signed-off-by: NChaitra P B <chaitra.basappa@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Driver assumes HighPriority credit as part of Global credit. But,
Firmware treats HighPriority credit value and global cedits as two
different values. Changed host queue algorithm to treat global credits
and highPriority credits as two different values.
Signed-off-by: NSuganath prabu Subramani <suganath-prabu.subramani@avagotech.com>
Signed-off-by: NChaitra P B <chaitra.basappa@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Never block the SEP device (i.e. Never invoke the
scsi_internal_device_block() API for SEP device) even for the delay not
responding events. Blocking the SEP device will create a deadlock while
adding any device to the OS.
Signed-off-by: NSuganath prabu Subramani <suganath-prabu.subramani@avagotech.com>
Signed-off-by: NChaitra P B <chaitra.basappa@avagotech.com>
Reviewed-by: NTomas Henzl <thenzl@redhat.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>