- 14 Apr, 2017 18 commits
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Matthew R. Ochs authored
As an enhancement to distribute requests to multiple hardware queues, add the infrastructure to hash a SCSI command into a particular hardware queue. Support the following scenarios when deriving which queue to use: single queue, tagging when SCSI-MQ enabled, and simple hash via CPU ID when SCSI-MQ is disabled. Rather than altering the existing send API, the derived hardware queue is stored in the AFU command where it can be used for sending a command to the chosen hardware queue. Signed-off-by:
Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by:
Uma Krishnan <ukrishn@linux.vnet.ibm.com> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com>
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Matthew R. Ochs authored
As staging for supporting multiple hardware queues, add an attribute to show and set the current number of hardware queues for the host. Support specifying a hard limit or a CPU affinitized value. This will allow the number of hardware queues to be tuned by a system administrator. Signed-off-by:
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Uma Krishnan authored
Introduce multiple hardware queues to improve legacy I/O path performance. Each hardware queue is comprised of a master context and associated I/O resources. The hardware queues are initially implemented as a static array embedded in the AFU. This will be transitioned to a dynamic allocation in a later series to improve the memory footprint of the driver. Signed-off-by:
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Matthew R. Ochs authored
The method used to decode asynchronous interrupts involves unnecessary loops to match up bits that are set with corresponding entries in the asynchronous interrupt information table. This algorithm is wasteful and does not scale well as new status bits are supported. As an improvement, use the for_each_set_bit() service to iterate over the asynchronous status bits and refactor the information table such that it can be indexed by bit position. Signed-off-by:
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Matthew R. Ochs authored
As a general cleanup, address all reasonable checkpatch warnings and errors. These include enforcement of comment styles and including named identifiers in function prototypes. Signed-off-by:
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Matthew R. Ochs authored
Validation statements to enforce assumptions about specific defines are not being evaluated by the compiler due to the fact that they reside in a routine that is not used. To activate them, call the routine as part of module initialization. As an additional, related cleanup, remove the now-defunct CXLFLASH_NUM_CMDS. Signed-off-by:
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Matthew R. Ochs authored
Devices supported by the cxlflash driver are fully coherent and do not require a bus address mapping. Avoid unnecessary path length by using the virtual address and length already present in the scatter-gather entry. Signed-off-by:
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Matthew R. Ochs authored
An EEH during probe can lead to a crash as the recovery thread races with the probe thread. To avoid this issue, introduce new states to fence out EEH recovery until probe has completed. Also ensure the reset wait queue is flushed during device removal to avoid orphaned threads. Signed-off-by:
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Matthew R. Ochs authored
Update the driver to allow for future cards with 4 ports. Signed-off-by:
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Matthew R. Ochs authored
Update the SISlite header to support 4 ports as outlined in the SISlite specification. Address fallout from structure renames and refreshed organization throughout the driver. Determine the number of ports supported by a card from the global port selection mask register reset value. Signed-off-by:
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Matthew R. Ochs authored
As staging to support FC-related updates to the SISlite specification, introduce helper routines to obtain references to FC resources that exist within the global map. This will allow changes to the underlying global map structure without impacting existing code paths. Signed-off-by:
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Matthew R. Ochs authored
At present, the cxlflash driver only supports hardware with two FC ports. The code was initially designed with this assumption and is dependent on having two FC ports - adding more ports will break logic within the driver. To mitigate this issue, remove the existing port assumptions and transition the code to support more than two ports. As a side effect, clarify the interpretation of the DK_CXLFLASH_ALL_PORTS_ACTIVE flag. Signed-off-by:
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Matthew R. Ochs authored
Transition from a static number of FC ports to a value that is derived during probe. For now, a static value is used but this will later be based on the type of card being configured. Signed-off-by:
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Matthew R. Ochs authored
As staging for future function, pass the config pointer instead of the AFU pointer for port-related sysfs helper routines. Signed-off-by:
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Matthew R. Ochs authored
Currently, RRQ processing takes place on hardware interrupt context. This can be a heavy burden in some environments due to the overhead encountered while completing RRQ entries. In an effort to improve system performance, use the IRQ polling API to schedule this processing on softirq context. This function will be disabled by default until starting values can be established for the hardware supported by this driver. Signed-off-by:
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Matthew R. Ochs authored
As further staging to support processing the HRRQ by other means, access to the HRRQ needs to be serialized by a disabled lock. This will allow safe access in other non-hardware interrupt contexts. In an effort to minimize the period where interrupts are disabled, support is added to queue up commands harvested from the RRQ such that they can be processed with hardware interrupts enabled. While this doesn't offer any improvement with processing on a hardware interrupt it will help when IRQ polling is supported and the command completions can execute on softirq context. Signed-off-by:
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Matthew R. Ochs authored
In order to support processing the HRRQ by other means (e.g. polling), the processing portion of the current RRQ interrupt handler needs to be broken out into a separate routine. This will allow RRQ processing from places other than the RRQ hardware interrupt handler. Signed-off-by:
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Colin Ian King authored
Trivial fix to spelling mistake in SNIC_ERR error message text, one cannot have "Cann't". Signed-off-by:
Colin Ian King <colin.king@canonical.com> Signed-off-by:
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- 12 Apr, 2017 14 commits
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Xiang Chen authored
For 1 bit ECC errors, those errors can be recovered by hw. But for multi-bits ECC and AXI errors, there are something wrong with whole module or system, so try reset the controller to recover those errors instead of calling panic(). Signed-off-by:
Xiang Chen <chenxiang66@hisilicon.com> Signed-off-by:
John Garry <john.garry@huawei.com> Signed-off-by:
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John Garry authored
If a TMF timeouts (maybe due to unlikely scenario of an expander being unplugged when TMF for remote device is active), when we eventually try to free the slot, we crash as we dereference the slot's task, which has already been released. As a fix, add checks in the slot release code for a NULL task. Signed-off-by:
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John Garry authored
This patch is a workaround for a SoC bug where an internal abort command may timeout. In v2 hw, the channel should become idle in order to finish abort process. If the target side has been sending HOLD, host side channel failed to complete the frame to send, and can not enter the idle state. Then internal abort command will timeout. As this issue is only in v2 hw, we deal with it in the hw layer. Our workaround solution is: If abort is not finished within a certain period of time, we will check HOLD status. If HOLD has been sending, we will send break command. Signed-off-by:
Xiaofei Tan <tanxiaofei@huawei.com> Signed-off-by:
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Xiaofei Tan authored
This patch adds a workaround solution for a SoC bug which may cause SoC logic fatal error when disabling a PHY. Then we find internal abort IO timeout may occur, and the controller IO breakpoint may be corrupted. We work around this SoC bug by optimizing the flow of disabling a PHY. Signed-off-by:
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Xiaofei Tan authored
This patch provides a workaround a SoC bug where SATA IPTTs for different devices may conflict. The workaround solution requests the following: 1. SATA device id must be even and not equal to SAS IPTT. 2. SATA device can not share the same IPTT with other SAS or SATA device. Besides we shall consider IPTT value 0 is reserved for another SoC bug (STP device open link at firstly after SAS controller reset). To sum up, the solution is: Each SATA device uses independent and continuous 32 even IPTT from 64 to 4094, then v2 hw can only support 63 SATA devices. All SAS device(SSP/SMP devices) share odd IPTT value from 1 to 4095. Signed-off-by:
Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by:
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Xiaofei Tan authored
After resetting the controller, the process of scanning SATA disks attached to an expander may fail occasionally. The issue is that the controller can't close the STP link created by target if the max link time is 0. To workaround this issue, we reject STP link after resetting the controller, and change the corresponding PHY to accept STP link only after receiving data. We do this check in cq interrupt handler. In order not to reduce efficiency, we use an variable to control whether we should check and change PHY to accept STP link. The function phys_reject_stp_links_v2_hw() should be called after resetting the controller. The solution of another SoC bug "SATA IO timeout", that also uses the same register to control STP link, is not effective before the PHY accepts STP link. Signed-off-by:
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Johannes Thumshirn authored
Directly call ELS request handler functions in fc_lport_recv_els_req instead of saving the pointer to the handler's receive function and then later dereferencing this pointer. This makes the code a bit more obvious. Signed-off-by:
Chad Dupuis <chad.dupuis@cavium.com> Signed-off-by:
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Hannes Reinecke authored
sg_remove_sfp_usercontext() is clearing any sg requests, but needs to take 'rq_list_lock' when modifying the list. Reported-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Hannes Reinecke <hare@suse.com> Reviewed-by:
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Hannes Reinecke authored
'Sg_request' is using a private list implementation; convert it to standard lists. Signed-off-by:
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Johannes Thumshirn authored
Check for a valid direction before starting the request, otherwise we risk running into an assertion in the scsi midlayer checking for valid requests. [mkp: fixed typo] Signed-off-by:
Dmitry Vyukov <dvyukov@google.com> Signed-off-by:
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Hannes Reinecke authored
The 'reserved' page array is used as a short-cut for mapping data, saving us to allocate pages per request. However, the 'reserved' array is only capable of holding one request, so this patch introduces a mutex for protect 'sg_fd' against concurrent accesses. Signed-off-by:
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Hannes Reinecke authored
Unused. Signed-off-by:
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Hannes Reinecke authored
The ioctl SET_FORCE_LOW_DMA has never worked since the initial git check-in, and the respective setting is nowadays handled correctly. So disable it entirely. Signed-off-by:
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Colin Ian King authored
There are several local or function parameter pointers that are being assigned NULL after a kfree where and these have no effect and hence can be removed. Fixes various cppcheck warnings: "Assignment of function parameter has no effect outside the function. Did you forget dereferencing it" Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
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- 06 Apr, 2017 8 commits
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Nicholas Mc Guire authored
The redundant init_completion() here seems to be a cut&past error as struct scsi_qla_host only has 4 completion elements to initialize, thus the duplicate init_completion(disable_acb_comp) is simply removed. Signed-off-by:
Nicholas Mc Guire <der.herr@hofr.at> Signed-off-by:
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Hannes Reinecke authored
There hasn't been any reports for HBAs where asynchronous abort would not work, so we should make it mandatory and remove the fallback. Signed-off-by:
Hannes Reinecke <hare@suse.de> Reviewed-by:
Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by:
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Hannes Reinecke authored
scsi_eh_scmd_add() currently only will fail if no error handler thread is started (which will never be the case) or if the state machine encounters an illegal transition. But if we're encountering an invalid state transition chances is we cannot fixup things with the error handler. So better add a WARN_ON for illegal host states and make scsi_dh_scmd_add() a void function. Signed-off-by:
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Hannes Reinecke authored
If a failed command is retried and fails again we need to enter SCSI EH, otherwise we will never be able to recover the command. To detect this situation we must not clear scmd->eh_eflags when EH finishes but rather make it persistent throughout the lifetime of the command. Signed-off-by:
Benjamin Block <bblock@linux.vnet.ibm.com> Reviewed-by:
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Christoph Hellwig authored
We now first try to call ->eh_abort_handler from a work queue, but libsas was always failing that for no good reason. Allow async aborts. Reviewed-by:
Johannes Thumshirn <jth@kernel.org> Reviewed-by:
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Hannes Reinecke authored
When a command has timed out we always should be sending an abort; with the previous code a failed abort might signal SCSI EH to start, and all other timed out commands will never be aborted, even though they might belong to a different ITL nexus. Cc: Benjamin Block <bblock@linux.vnet.ibm.com> Signed-off-by:
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Hannes Reinecke authored
If sd_eh_action() decides to take the device offline there is no point in returning FAILED, as taking the device offline is the ultimate step in SCSI EH anyway. So further escalation via SCSI EH is not likely to make a difference and we can as well return SUCCESS. Cc: Benjamin Block <bblock@linux.vnet.ibm.com> Signed-off-by:
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Hannes Reinecke authored
The current medium access timeout counter will be increased for each command, so if there are enough failed commands we'll hit the medium access timeout for even a single device failure and the following kernel message is displayed: sd H:C:T:L: [sdXY] Medium access timeout failure. Offlining disk! Fix this by making the timeout per EH run, ie the counter will only be increased once per device and EH run. Fixes: 18a4d0a2 ("[SCSI] Handle disk devices which can not process medium access commands") Cc: Ewan Milne <emilne@redhat.com> Cc: Lawrence Obermann <loberman@redhat.com> Cc: Benjamin Block <bblock@linux.vnet.ibm.com> Cc: Steffen Maier <maier@linux.vnet.ibm.com> Signed-off-by:
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