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path: root/drivers/scsi/lpfc
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2019-08-19scsi: lpfc: Add NVMe sequence level error recovery supportJames Smart
FC-NVMe-2 added support for sequence level error recovery in the FC-NVME protocol. This allows for the detection of errors and lost frames and immediate retransmission of data to avoid exchange termination, which escalates into NVMeoFC connection and association failures. A significant RAS improvement. The driver is modified to indicate support for SLER in the NVMe PRLI is issues and to check for support in the PRLI response. When both sides support it, the driver will set a bit in the WQE to enable the recovery behavior on the exchange. The adapter will take care of all detection and retransmission. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Support dynamic unbounded SGL lists on G7 hardware.James Smart
Typical SLI-4 hardware supports up to 2 4KB pages to be registered per XRI to contain the exchanges Scatter/Gather List. This caps the number of SGL elements that can be in the SGL. There are not extensions to extend the list out of the 2 pages. The G7 hardware adds a SGE type that allows the SGL to be vectored to a different scatter/gather list segment. And that segment can contain a SGE to go to another segment and so on. The initial segment must still be pre-registered for the XRI, but it can be a much smaller amount (256Bytes) as it can now be dynamically grown. This much smaller allocation can handle the SG list for most normal I/O, and the dynamic aspect allows it to support many MB's if needed. The implementation creates a pool which contains "segments" and which is initially sized to hold the initial small segment per xri. If an I/O requires additional segments, they are allocated from the pool. If the pool has no more segments, the pool is grown based on what is now needed. After the I/O completes, the additional segments are returned to the pool for use by other I/Os. Once allocated, the additional segments are not released under the assumption of "if needed once, it will be needed again". Pools are kept on a per-hardware queue basis, which is typically 1:1 per cpu, but may be shared by multiple cpus. The switch to the smaller initial allocation significantly reduces the memory footprint of the driver (which only grows if large ios are issued). Based on the several K of XRIs for the adapter, the 8KB->256B reduction can conserve 32MBs or more. It has been observed with per-cpu resource pools that allocating a resource on CPU A, may be put back on CPU B. While the get routines are distributed evenly, only a limited subset of CPUs may be handling the put routines. This can put a strain on the lpfc_put_cmd_rsp_buf_per_cpu routine because all the resources are being put on a limited subset of CPUs. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Add MDS driver loopback diagnostics supportJames Smart
Added code to support driver loopback with MDS Diagnostics. This style of diagnostics passes frames from the fabric to the driver who then echo them back out the link. SEND_FRAME WQEs are used to transmit the frames. Added the SOF and EOF field location definitions for use by SEND_FRAME. Also ensure that enable_mds_diags is a RW parameter. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Add first and second level hardware revisions to sysfs reportingJames Smart
To aid better hardware detection when there are issues, report the first and second level hardware revisions from the READ_REV command. Add the elements to the existing hardware id string. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Migrate to %px and %pf in kernel print callsJames Smart
In order to see real addresses, convert %p with %px for kernel addresses and replace %p with %pf for functions. While converting, standardize on "x%px" throughout (not %px or 0x%px). Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Add simple unlikely optimizations to reduce NVME latencyJames Smart
While performing code review, several relatively simple optimizations can be done in the fast path. Add these optimizations (unlikely designators). Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix coverity warningsJames Smart
Running on Coverity produced the following errors: - coding style (indentation) - memset size mismatch errors note: comment cases where it is purposely a mismatch Fix the errors. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix nvme first burst module parameter descriptionJames Smart
modinfo for lpfc_nvme_enable_fb is incorrect. FirstBurst on lpfc target is not fully supported. Update the attribute description Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix BlockGuard enablement on FCoE adaptersJames Smart
The driver is allowing the user to change lpfc_enable_bg while loading the driver against a FCoE adapter. This is not supported. No check is made for the adapter type when applying the blockguard enablement value. Fix by verifying the adapter type before setting the enablement flag. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix reported physical link speed on a disabled trunked linkJames Smart
GetTrunkInfo is displaying an incorrect link speed when the link is a trunk and the link has gone down. The driver is not clearing the logical speed as part of the link down transition. Fix by setting the logical speed to UNKNOWN SPEED when the link goes down. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix Max Frame Size value shown in fdmishow outputJames Smart
Max Frame Size value is shown as 34816 in fdmishow from Switch. The driver uses bbRcvSize in common service param which is obtained from the READ_SPARM mailbox command. The bbRcvSize field which is displayed is a three nibble field but the driver is printing a full four nibbles. Fix by masking off the upper nibble. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix upcall to bsg done in non-success casesJames Smart
The scsi transport fc bsg interface does not expect the bsg_job_done() callback to be done if the bsg request call returns failure. Several of the HST_VENDOR cases in the driver unconditionally call bsg_job_done() regardless of the returning value. Fix the code to only call bsg_job_done() if the call to lpfc_bsg_request() will return success. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix sli4 adapter initialization with MSIJames Smart
When forcing the use of MSI (vs MSI-X) the driver is crashing in pci_irq_get_affinity. The driver was not using the new pci_alloc_irq_vectors interface in the MSI path. Fix by using pci_alloc_irq_vectors() with PCI_RQ_MSI in the MSI path. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix nvme sg_seg_cnt display if HBA does not support NVMEJames Smart
The driver is currently reporting a non-zero nvme sg_seg_cnt value of 256 when nvme is disabled. It should be zero. Fix by ensuring the value is cleared. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix nvme target mode ABTSing a received ABTSJames Smart
If an unsolicited ABTS was received, the driver looks up the exchange it references. It it does various searches looking for the exchange context. When one is eventually matched and it is associated with an XRI context, the driver sends an ABORT WQE to terminate the exchange. Current code looks at whether the transport had taken action on the XRI yet or not (no action if set to LPFC_NVMET_STE_RCV; action if non-LPFC_NVMET_STE_RCV). Based on action or not one of two (sol vs unsol) issue abort routines are called. The unsol version cheats and transmits a sequence containing an ABTS with no interaction with the adapter. The sol version issues an Abort WQE and lets the adapter manage whether the ABTS is sent to not. The issue is the unsol version is sending ABTS unconditionally for the exchange that received the ABTS. It's unnecessary. Remove the conditional and just call the adapter command-based routine to let the adapter manage the ABTS. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix hang when downloading fw on port enabled for nvmeJames Smart
As part of firmware download, the adapter is reset. On the adapter the reset causes the function to stop and all outstanding io is terminated (without responses). The reset path then starts teardown of the adapter, starting with deregistration of the remote ports with the nvme-fc transport. The local port is then deregistered and the driver waits for local port deregistration. This never finishes. The remote port deregistrations terminated the nvme controllers, causing them to send aborts for all the outstanding io. The aborts were serviced in the driver, but stalled due to its state. The nvme layer then stops to reclaim it's outstanding io before continuing. The io must be returned before the reset on the controller is deemed complete and the controller delete performed. The remote port deregistration won't complete until all the controllers are terminated. And the local port deregistration won't complete until all controllers and remote ports are terminated. Thus things hang. The issue is the reset which stopped the adapter also stopped all the responses that would drive i/o completions, and the aborts were also stopped that stopped i/o completions. The driver, when resetting the adapter like this, needs to be generating the completions as part of the adapter reset so that I/O complete (in error), and any aborts are not queued. Fix by adding flush routines whenever the adapter port has been reset or discovered in error. The flush routines will generate the completions for the scsi and nvme outstanding io. The abort ios, if waiting, will be caught and flushed as well. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix too many sg segments spamming in kernel logJames Smart
This issue is specific to SLI-3 adapters, specifically when DIF is used. Once seen, this message floods the logs: 9064 BLKGRD: lpfc_scsi_prep_dma_buf_s3: Too many sg segments from dma_map_sg The driver, upon detecting an error such as too many elements in an sglist, misrepresents the error by treating it as a temporary resource issue by returning MLQUEUE_HOST_BUSY. In these cases, no retry will fix it and it should have been a hard error. The repeated retry was causing the spamming of the log. As for the initial reason of why an I/O encountered this issue at all is not clear as parameters set by the driver should have avoided this. The dm multipath maintainer has been notified of the issue. Fix by changing the return code for the dma mapping routines to indicate cases that are not retryable and return DID_ERROR on those cases. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix crash due to port reset racing vs adapter error handlingJames Smart
If the adapter encounters a condition which causes the adapter to fail (driver must detect the failure) simultaneously to a request to the driver to reset the adapter (such as a host_reset), the reset path will be racing with the asynchronously-detect adapter failure path. In the failing situation, one path has started to tear down the adapter data structures (io_wq's) while the other path has initiated a repeat of the teardown and is in the lpfc_sli_flush_xxx_rings path and attempting to access the just-freed data structures. Fix by the following: - In cases where an adapter failure is detected, rather than explicitly calling offline_eratt() to start the teardown, change the adapter state and let the later calls of posted work to the slowpath thread invoke the adapter recovery. In essence, this means all requests to reset are serialized on the slowpath thread. - Clean up the routine that restarts the adapter. If there is a failure from brdreset, don't immediately error and leave things in a partial state. Instead, ensure the adapter state is set and finish the teardown of structures before returning. - If in the scsi host reset handler and the board fails to reset and restart (which can be due to parallel reset/recovery paths), instead of hard failing and explicitly calling offline_eratt() (which gets into the redundant path), just fail out and let the asynchronous path resolve the adapter state. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix deadlock on host_lock during cable pullsJames Smart
During cable pull testing a deadlock was seen between lpfc_nlp_counters() vs lpfc_mbox_process_link_up() vs lpfc_work_list_done(). They are all waiting on the shost->host_lock. Issue is all of these cases raise irq when taking out the lock but use spin_unlock_irq() when unlocking. The unlock path is will unconditionally re-enable interrupts in cases where irq state should be preserved. The re-enablement allowed the other paths to execute which then causes the deadlock. Fix by converting the lock/unlock to irqsave/irqrestore. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix error in remote port address changeJames Smart
In a test with high nvme remote port counts connected via a multi-hop FC switch config where switches were systematically reset (e.g. fabric partitioning and re-establishment), the nvme remote ports would switch addresses based on the switch reconfiguration events. The driver would get into a situation where the nvme port changed address, PLOGI and PRLI would succeed nvme transport registration occurred, but subsequent LS requests by the nvme subsystem failed due to a bad ndlp state and connectivity to the device failed. The driver hit a race condition on multiple devices that address swapped simultaneously. In cases where the driver notices the remote port structure came back as the same value as previously (meaning a nvme_rport structure was re-enabled and did not go through devloss_tmo/connect_tmo_failures on all controllers) the driver would unconditionally exit assuming the ndlp information was correct. But, if the ndlp's had been swapped, the ndlp had stale port state information, which when used by the LS request commands, would fail the commands. Fix by checking whether a node swap had occurred, and only exit if no ndlp swap had occurred. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix driver nvme rescan loggingJames Smart
In situations where zoning is not being used, thus NVMe initiators see other NVMe initiators as well as NVMe targets, a link bounce on an initiator will cause the NVMe initiators to spew "6169" State Error messages. The driver is not qualifying whether the remote port is a NVMe targer or not before calling the lpfc_nvme_rescan_port(), which validates the role and prints the message if its only an NVMe initiator. Fix by the following: - Before calling lpfc_nvme_rescan_port() ensure that the node is a NVMe storage target or a NVMe discovery controller. - Clean up implementation of lpfc_nvme_rescan_port. remoteport pointer will always be NULL if a NVMe initiator only. But, grabbing of remoteport pointer should be done under lock to coincide with the registering of the remote port with the fc transport. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix sg_seg_cnt for HBAs that don't support NVMEJames Smart
On an SLI-3 adapter which does not support NVMe, but with the driver global attribute to enable nvme on any adapter if it does support NVMe (e.g. module parameter lpfc_enable_fc4_type=3), the SGL and total SGE values are being munged by the protocol enablement when it shouldn't be. Correct by changing the location of where the NVME sgl information is being applied, which will avoid any SLI-3-based adapter. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix propagation of devloss_tmo setting to nvme transportJames Smart
If admin changes the devloss_tmo on an rport via the fc_remote_port rport dev_loss_tmo attribute, the value is on set on scsi stack. The change is not propagated to NVMe. The set routine in the lldd lacks the call to nvme_fc_set_remoteport_devloss() to set the value. Fix by adding the call to the lldd set routine. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix loss of remote port after devloss due to lack of RPIsJames Smart
In tests with remote ports contantly logging out/logging coupled with occassional local link bounce, if a remote port is disocnnected for longer than devloss_tmo and then subsequently reconnected, eventually the test will fail to login with the remote port and remote port connectivity is lost. When devloss_tmo expires, the driver does not free the node struct until the port or npiv instances is being deleted. The node is left allocated but the state set to UNUSED. If the node was in the process of logging in when the local link drop occurred, meaning the RPI was allocated for the node in order to send the ELS, but not yet registered which comes after successful login, the node is moved to the NPR state, and if devloss expires, to UNUSED state. If the remote port comes back, the node associated with it is restarted and this path happens to allocate a new RPI and overwrites the prior RPI value. In the cases where the port was logged in and loggs out, the path did release the RPI but did not set the node rpi value. In the cases where the remote port never finished logging in, the path never did the call to release the rpi. In this latter case, when the node is subsequently restore, the new rpi allocation overwrites the rpi that was not released, and the rpi is now leaked. Eventually the port will run out of RPI resources to log into new remote ports. Fix by following changes: - When an rpi is released, do so under locks and ensure the node rpi value is set to a non-allocated value (LPFC_RPI_ALLOC_ERROR). Note: refactored to a small service routine to avoid indentation issues. - When re-enabling a node, check the rpi value to determine if a new allocation is necessary. If already set, use the prior rpi. Enhanced logging to help in the future. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix devices that don't return after devloss followed by rediscoveryJames Smart
If a remote port is removed and remains removed for devloss_tmo, if an RSCN is subsequently received indicating the presence of the remte port, the driver does not login to and rediscovery the remote port. Currently, in order to for a port to be rediscovered post an RSCN, the node state must be NPR to reflect not logged in. When devloss expires, the node state is marked UNUSED. When an RSCN occurs, the nodes referenced by the RSCN will have a NPR_2B_DISC flag set, but the re-login will only be attempted if the node is in NPR_NODE state. Thus the node is skipped over. Fix by recognizing the NPR_2B_DISC and UNUSED and transition the node back to NPR state to allow the re-login to take place. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix null ptr oops updating lpfc_devloss_tmo via sysfs attributeJames Smart
If an admin updates lpfc's devloss_tmo sysfs attribute, the kernel will oops. Coding of a loop allowed a new value (rport) to be set/checked for null followed by an older value (remoteport) checked for null to allow progress where the new value, even though null, will be referenced. Rework the logic to validate and prevent any reference to the null ptr. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix FLOGI handling across multiple link up/down conditionsJames Smart
It's possible for the driver to initiate an FLOGI and before it completes, another link down/up transition occurs requiring a new FLOGI. Currently, nothing is done to abort/noop the older FLOGI request to the adapter, so if this transition occurs and the FLOGI completion is received after the link down/up transition, the driver may erroneously act on the older FLOGI. In most cases, the adapter properly terminates/fails the FLOGI, but there is a timing condition where the FLOGI may complete on the wire prior to the transition, but the response may not be seen/processed by the driver before the driver sees the link transition. Fix by having the link down handler in the driver run through any outstanding ELS's and change the completion handler of the ELS so that it will be no-op'd and released. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix oops when fewer hdwqs than cpusJames Smart
When tearing down the adapter for a reset, online/offline, or driver unload, the queue free routine would hit a GPF oops. This only occurs on conditions where the number of hardware queues created is fewer than the number of cpus in the system. In this condition cpus share a hardware queue. And of course, it's the 2nd cpu that shares a hardware that attempted to free it a second time and hit the oops. Fix by reworking the cpu to hardware queue mapping such that: Assignment of hardware queues to cpus occur in two passes: first pass: is first time assignment of a hardware queue to a cpu. This will set the LPFC_CPU_FIRST_IRQ flag for the cpu. second pass: for cpus that did not get a hardware queue they will be assigned one from a primary cpu (one set in first pass). Deletion of hardware queues is driven by cpu itteration, and queues will only be deleted if the LPFC_CPU_FIRST_IRQ flag is set. Also contains a few small cleanup fixes and a little better logging. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix irq raising in lpfc_sli_hba_downJames Smart
The adapter reset path (lpfc_sli_hba_down) is taking/releasing a lock with irq. But, the path is already under the hbalock which raised irq so it's unnecessary. Convert to simple lock/unlock. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix Oops in nvme_register with target logout/loginJames Smart
lpfc_nvme_register_port hit a null prev_ndlp pointer in a test with lots of target ports swapping addresses. The oldport value was stale, thus it's ndlp (prev_ndlp set to it) was used. Fix by moving oldrport pointer checks, and if used prev_ndlp pointer assignment, to be done while the lock is held. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix issuing init_vpi mbox on SLI-3 cardJames Smart
The driver is inadvertently trying to issue an INIT_VPI mailbox command on an SLI-3 driver. The command is specific to SLI-4. When the call is made to send the command, if on an SLI-3 adapter, an array pointer is NULL and the driver will oops. Fix by restricting the command to SLI-4 adapters only. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix ADISC reception terminating login state if a NVME targetJames Smart
If a target issues an ADISC to the port and the target is a NVME target, the driver is inadvertantly invalidating the login and marking the remote port as logged out. Communication with the target is lost. Revise the ADISC check so that FCP or NVME targets will be marked valid at the end of ADISC processing. Enhance logging to recognize condition better. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix discovery when target has no GID_FT informationJames Smart
Some remote ports may be slow in registering their GID_FT protocol information with the fabric. If the remote port is an initiator, it may send PLOGI to the port before the GID_FT logic is complete. Meaning, after accepting the PLOGI, when the driver may see no response to the GID_FT that is issued after the login to determine the protocols supported so that proper PRLI's may be transmit. If the driver has no fc4 information, it currently stops and the remote port is not discovered. Fix by issuing a LOGO when there is no GID_FT information. The LOGO completion handling will attempt to re-login if the nport_id is still present. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix port relogin failure due to GID_FT interactionJames Smart
In cases of remote-port-side cable pull/replug, there happens to be a target that upon replug will send the port a PLOGI, a PRLI, and a LOGO. When this sequence is received by the driver, the PLOGI accepted and a GFT_ID is issued to find the protocol support for the remote port. While the GFT_ID is outstanding, a LOGO is received. The driver logs the remote port out and unregisters the RPI and schedules a new PLOGI transmission. However, the GFT_ID was not terminated. When it completed, the driver attempted to transition the remote port to PRLI transmission, which cancels the PLOGI scheduling. The PRLI transmit attempt is rejected by the adapter as the remote port is not logged in. No retry is attempted as it's expected the logout is noted and the supposedly scheduled PLOGI should address the state. As there is no PLOGI, the remote port does not get re-discovered. Fix by aborting the outstanding GFT_ID if the related remote port is logged out. Ensure a PRLI transmit attempt only occurs if the remote port is logging in. This avoids the incorrect attempt while logged out. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix leak of ELS completions on adapter resetJames Smart
If the adapter is reset while there are outstanding ELS's, subsequent reinitialization of the adapter will fail as it has not recovered all of the io contexts relative to the ELS's. If an ELS timed out or otherwise failed and an the ELS was attempted to be aborted (which changes the ELS completion context), in causes where the driver generates completions for the outstanding IO as the adapter would not due to being reset, the driver released only the ELS context and failed to release the abort context. When the adapter went to reinit, as it had not received all of the contexts, it failed to reinit. Fix by having the ELS completion handler identify the driver-generated completion status and release the abort context. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix failure to clear non-zero eq_delay after io rate reductionJames Smart
Unusually high IO latency can be observed with little IO in progress. The latency may remain high regardless of amount of IO and can only be cleared by forcing lpfc_fcp_imax values to non-zero and then back to zero. The driver's eq_delay mechanism that scales the interrupt coalescing based on io completion load failed to reduce or turn off coalescing when load decreased. Specifically, if no io completed on a cpu within an eq_delay polling window, the eq delay processing was skipped and no change was made to the coalescing values. This left the coalescing values set when they were no longer applicable. Fix by always clearing the percpu counters for each time period and always run the eq_delay calculations if an eq has a non-zero coalescing value. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix crash on driver unload in wq freeJames Smart
If a timer routine uses workqueues, it could fire before the workqueue is allocated. Fix by allocating the workqueue before the timer routines are setup Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix ELS field alignmentsJames Smart
After seeing some interoperability issues with ADISC, it was determined the ELS definitions in lpfc were using types that allowed the compiler to add pad to the structure, causing the structure to no longer be per spec. The offending structures are ADISC, FAN, and RNID. This patch implements the simple fix of eliminating the pad by forcing the compiler to pack the structure. Care was taken to ensure field accesses won't be by operations that would hit a bad field alignment. The better solution would be to convert to the uapi fc header definitions, but the number of changes required to do is rather intrusive so this course of action was deferred. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Fix PLOGI failure with high remoteport countJames Smart
When connected to a high number of remote ports, the driver is encountering PLOGI errors. The errors are due to adapter detected failures indicating illegal field values. Turns out the driver was prematurely clearing an RPI bitmask before waiting for an UNREG_RPI mailbox completion. This allowed the RPI to be reused before it was actually available. Fix by clearing RPI bitmask only after UNREG_RPI mailbox completion. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Limit xri count for kdump environmentJames Smart
scsi-mq operation inherently performs pre-allocation of resources for blk-mq request queues. Even though the kdump environment reduces the configuration to a single CPU, thus 1 hardware queue, which helps significantly, the resources are still rather large due to the per request allocations. blk-mq pre-allocations can be over 4KB per request. With adapter can_queue values in the 4k or 8k range, this can easily be 32MBs before any other driver memory is factored in. Driver SGL DMA buffer allocation can be up to 8KB per request as well adding an additional 64MB. Totals are well over 100MB for a single shost. Given kdump memory auto-sizing utilities don't accommodate this amount of memory well, it's very possible for kdump to fail due to lack of memory. Fix by having the driver recognize that it is booting within a kdump context and reduce the number of requests it will support to a more reasonable value. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: remove NULL check before some freeing functionsHariprasad Kelam
As dma_pool_destroy and mempool_destroy functions has NULL check. We may not need NULL check before calling them. Fix below warnings reported by coccicheck ./drivers/scsi/lpfc/lpfc_mem.c:252:2-18: WARNING: NULL check before some freeing functions is not needed. ./drivers/scsi/lpfc/lpfc_mem.c:255:2-18: WARNING: NULL check before some freeing functions is not needed. ./drivers/scsi/lpfc/lpfc_mem.c:258:2-18: WARNING: NULL check before some freeing functions is not needed. ./drivers/scsi/lpfc/lpfc_mem.c:261:2-18: WARNING: NULL check before some freeing functions is not needed. ./drivers/scsi/lpfc/lpfc_mem.c:265:2-18: WARNING: NULL check before some freeing functions is not needed. ./drivers/scsi/lpfc/lpfc_mem.c:269:2-17: WARNING: NULL check before some freeing functions is not needed. Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com> Reviewed-by: James Smart <james.smart@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: Mitigate high memory pre-allocation by SCSI-MQJames Smart
When SCSI-MQ is enabled, the SCSI-MQ layers will do pre-allocation of MQ resources based on shost values set by the driver. In newer cases of the driver, which attempts to set nr_hw_queues to the cpu count, the multipliers become excessive, with a single shost having SCSI-MQ pre-allocation reaching into the multiple GBytes range. NPIV, which creates additional shosts, only multiply this overhead. On lower-memory systems, this can exhaust system memory very quickly, resulting in a system crash or failures in the driver or elsewhere due to low memory conditions. After testing several scenarios, the situation can be mitigated by limiting the value set in shost->nr_hw_queues to 4. Although the shost values were changed, the driver still had per-cpu hardware queues of its own that allowed parallelization per-cpu. Testing revealed that even with the smallish number for nr_hw_queues for SCSI-MQ, performance levels remained near maximum with the within-driver affiinitization. A module parameter was created to allow the value set for the nr_hw_queues to be tunable. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Ewan D. Milne <emilne@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: use spin_lock_irqsave in IRQ contextFuqian Huang
As spin_unlock_irq will enable interrupts. Function lpfc_findnode_rpi is called from lpfc_sli_abts_err_handler (./drivers/scsi/lpfc/lpfc_sli.c) <- lpfc_sli_async_event_handler <- lpfc_sli_process_unsol_iocb <- lpfc_sli_handle_fast_ring_event <- lpfc_sli_fp_intr_handler <- lpfc_sli_intr_handler and lpfc_sli_intr_handler is an interrupt handler. Interrupts are enabled in interrupt handler. Use spin_lock_irqsave/spin_unlock_irqrestore instead of spin_(un)lock_irq in IRQ context to avoid this. Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com> Reviewed-by: James Smart <james.smart@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-19scsi: lpfc: remove redundant codeFuqian Huang
Remove the redundant initialization code. Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com> Reviewed-by: James Smart <james.smart@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-07scsi: lpfc: Fix crash when cpu count is 1 and null irq affinity maskJames Smart
When a configurations runs with a single cpu (such as a kdump kernel), which causes the driver to request a single vector, when the driver subsequently requests an irq affinity mask, the mask comes back null. The driver currently does nothing in this scenario, which leaves mappings to hardware queues incomplete and crashes the system. Fix by recognizing the null mask and assigning the vector to the first cpu in the system. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-07-22scsi: lpfc: Remove unnecessary null check before kfreeYueHaibing
A null check before a kfree is redundant, so remove it. This is detected by coccinelle. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Reviewed-by: James Smart <james.smart@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-07-20Merge tag 'scsi-fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi Pull SCSI fixes from James Bottomley: "This is the final round of mostly small fixes in our initial submit. It's mostly minor fixes and driver updates. The only change of note is adding a virt_boundary_mask to the SCSI host and host template to parametrise this for NVMe devices instead of having them do a call in slave_alloc. It's a fairly straightforward conversion except in the two NVMe handling drivers that didn't set it who now have a virtual infinity parameter added" * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (24 commits) scsi: megaraid_sas: set an unlimited max_segment_size scsi: mpt3sas: set an unlimited max_segment_size for SAS 3.0 HBAs scsi: IB/srp: set virt_boundary_mask in the scsi host scsi: IB/iser: set virt_boundary_mask in the scsi host scsi: storvsc: set virt_boundary_mask in the scsi host template scsi: ufshcd: set max_segment_size in the scsi host template scsi: core: take the DMA max mapping size into account scsi: core: add a host / host template field for the virt boundary scsi: core: Fix race on creating sense cache scsi: sd_zbc: Fix compilation warning scsi: libfc: fix null pointer dereference on a null lport scsi: zfcp: fix GCC compiler warning emitted with -Wmaybe-uninitialized scsi: zfcp: fix request object use-after-free in send path causing wrong traces scsi: zfcp: fix request object use-after-free in send path causing seqno errors scsi: megaraid_sas: Update driver version to 07.710.50.00 scsi: megaraid_sas: Add module parameter for FW Async event logging scsi: megaraid_sas: Enable msix_load_balance for Invader and later controllers scsi: megaraid_sas: Fix calculation of target ID scsi: lpfc: reduce stack size with CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE scsi: devinfo: BLIST_TRY_VPD_PAGES for SanDisk Cruzer Blade ...
2019-07-12Merge branch 'akpm' (patches from Andrew)Linus Torvalds
Merge updates from Andrew Morton: "Am experimenting with splitting MM up into identifiable subsystems perhaps with a view to gitifying it in complex ways. Also with more verbose "incoming" emails. Most of MM is here and a few other trees. Subsystems affected by this patch series: - hotfixes - iommu - scripts - arch/sh - ocfs2 - mm:slab-generic - mm:slub - mm:kmemleak - mm:kasan - mm:cleanups - mm:debug - mm:pagecache - mm:swap - mm:memcg - mm:gup - mm:pagemap - mm:infrastructure - mm:vmalloc - mm:initialization - mm:pagealloc - mm:vmscan - mm:tools - mm:proc - mm:ras - mm:oom-kill hotfixes: mm: vmscan: scan anonymous pages on file refaults mm/nvdimm: add is_ioremap_addr and use that to check ioremap address mm/memcontrol: fix wrong statistics in memory.stat mm/z3fold.c: lock z3fold page before __SetPageMovable() nilfs2: do not use unexported cpu_to_le32()/le32_to_cpu() in uapi header MAINTAINERS: nilfs2: update email address iommu: include/linux/dmar.h: replace single-char identifiers in macros scripts: scripts/decode_stacktrace: match basepath using shell prefix operator, not regex scripts/decode_stacktrace: look for modules with .ko.debug extension scripts/spelling.txt: drop "sepc" from the misspelling list scripts/spelling.txt: add spelling fix for prohibited scripts/decode_stacktrace: Accept dash/underscore in modules scripts/spelling.txt: add more spellings to spelling.txt arch/sh: arch/sh/configs/sdk7786_defconfig: remove CONFIG_LOGFS sh: config: remove left-over BACKLIGHT_LCD_SUPPORT sh: prevent warnings when using iounmap ocfs2: fs: ocfs: fix spelling mistake "hearbeating" -> "heartbeat" ocfs2/dlm: use struct_size() helper ocfs2: add last unlock times in locking_state ocfs2: add locking filter debugfs file ocfs2: add first lock wait time in locking_state ocfs: no need to check return value of debugfs_create functions fs/ocfs2/dlmglue.c: unneeded variable: "status" ocfs2: use kmemdup rather than duplicating its implementation mm:slab-generic: Patch series "mm/slab: Improved sanity checking": mm/slab: validate cache membership under freelist hardening mm/slab: sanity-check page type when looking up cache lkdtm/heap: add tests for freelist hardening mm:slub: mm/slub.c: avoid double string traverse in kmem_cache_flags() slub: don't panic for memcg kmem cache creation failure mm:kmemleak: mm/kmemleak.c: fix check for softirq context mm/kmemleak.c: change error at _write when kmemleak is disabled docs: kmemleak: add more documentation details mm:kasan: mm/kasan: print frame description for stack bugs Patch series "Bitops instrumentation for KASAN", v5: lib/test_kasan: add bitops tests x86: use static_cpu_has in uaccess region to avoid instrumentation asm-generic, x86: add bitops instrumentation for KASAN Patch series "mm/kasan: Add object validation in ksize()", v3: mm/kasan: introduce __kasan_check_{read,write} mm/kasan: change kasan_check_{read,write} to return boolean lib/test_kasan: Add test for double-kzfree detection mm/slab: refactor common ksize KASAN logic into slab_common.c mm/kasan: add object validation in ksize() mm:cleanups: include/linux/pfn_t.h: remove pfn_t_to_virt() Patch series "remove ARCH_SELECT_MEMORY_MODEL where it has no effect": arm: remove ARCH_SELECT_MEMORY_MODEL s390: remove ARCH_SELECT_MEMORY_MODEL sparc: remove ARCH_SELECT_MEMORY_MODEL mm/gup.c: make follow_page_mask() static mm/memory.c: trivial clean up in insert_page() mm: make !CONFIG_HUGE_PAGE wrappers into static inlines include/linux/mm_types.h: ifdef struct vm_area_struct::swap_readahead_info mm: remove the account_page_dirtied export mm/page_isolation.c: change the prototype of undo_isolate_page_range() include/linux/vmpressure.h: use spinlock_t instead of struct spinlock mm: remove the exporting of totalram_pages include/linux/pagemap.h: document trylock_page() return value mm:debug: mm/failslab.c: by default, do not fail allocations with direct reclaim only Patch series "debug_pagealloc improvements": mm, debug_pagelloc: use static keys to enable debugging mm, page_alloc: more extensive free page checking with debug_pagealloc mm, debug_pagealloc: use a page type instead of page_ext flag mm:pagecache: Patch series "fix filler_t callback type mismatches", v2: mm/filemap.c: fix an overly long line in read_cache_page mm/filemap: don't cast ->readpage to filler_t for do_read_cache_page jffs2: pass the correct prototype to read_cache_page 9p: pass the correct prototype to read_cache_page mm/filemap.c: correct the comment about VM_FAULT_RETRY mm:swap: mm, swap: fix race between swapoff and some swap operations mm/swap_state.c: simplify total_swapcache_pages() with get_swap_device() mm, swap: use rbtree for swap_extent mm/mincore.c: fix race between swapoff and mincore mm:memcg: memcg, oom: no oom-kill for __GFP_RETRY_MAYFAIL memcg, fsnotify: no oom-kill for remote memcg charging mm, memcg: introduce memory.events.local mm: memcontrol: dump memory.stat during cgroup OOM Patch series "mm: reparent slab memory on cgroup removal", v7: mm: memcg/slab: postpone kmem_cache memcg pointer initialization to memcg_link_cache() mm: memcg/slab: rename slab delayed deactivation functions and fields mm: memcg/slab: generalize postponed non-root kmem_cache deactivation mm: memcg/slab: introduce __memcg_kmem_uncharge_memcg() mm: memcg/slab: unify SLAB and SLUB page accounting mm: memcg/slab: don't check the dying flag on kmem_cache creation mm: memcg/slab: synchronize access to kmem_cache dying flag using a spinlock mm: memcg/slab: rework non-root kmem_cache lifecycle management mm: memcg/slab: stop setting page->mem_cgroup pointer for slab pages mm: memcg/slab: reparent memcg kmem_caches on cgroup removal mm, memcg: add a memcg_slabinfo debugfs file mm:gup: Patch series "switch the remaining architectures to use generic GUP", v4: mm: use untagged_addr() for get_user_pages_fast addresses mm: simplify gup_fast_permitted mm: lift the x86_32 PAE version of gup_get_pte to common code MIPS: use the generic get_user_pages_fast code sh: add the missing pud_page definition sh: use the generic get_user_pages_fast code sparc64: add the missing pgd_page definition sparc64: define untagged_addr() sparc64: use the generic get_user_pages_fast code mm: rename CONFIG_HAVE_GENERIC_GUP to CONFIG_HAVE_FAST_GUP mm: reorder code blocks in gup.c mm: consolidate the get_user_pages* implementations mm: validate get_user_pages_fast flags mm: move the powerpc hugepd code to mm/gup.c mm: switch gup_hugepte to use try_get_compound_head mm: mark the page referenced in gup_hugepte mm/gup: speed up check_and_migrate_cma_pages() on huge page mm/gup.c: remove some BUG_ONs from get_gate_page() mm/gup.c: mark undo_dev_pagemap as __maybe_unused mm:pagemap: asm-generic, x86: introduce generic pte_{alloc,free}_one[_kernel] alpha: switch to generic version of pte allocation arm: switch to generic version of pte allocation arm64: switch to generic version of pte allocation csky: switch to generic version of pte allocation m68k: sun3: switch to generic version of pte allocation mips: switch to generic version of pte allocation nds32: switch to generic version of pte allocation nios2: switch to generic version of pte allocation parisc: switch to generic version of pte allocation riscv: switch to generic version of pte allocation um: switch to generic version of pte allocation unicore32: switch to generic version of pte allocation mm/pgtable: drop pgtable_t variable from pte_fn_t functions mm/memory.c: fail when offset == num in first check of __vm_map_pages() mm:infrastructure: mm/mmu_notifier: use hlist_add_head_rcu() mm:vmalloc: Patch series "Some cleanups for the KVA/vmalloc", v5: mm/vmalloc.c: remove "node" argument mm/vmalloc.c: preload a CPU with one object for split purpose mm/vmalloc.c: get rid of one single unlink_va() when merge mm/vmalloc.c: switch to WARN_ON() and move it under unlink_va() mm/vmalloc.c: spelling> s/informaion/information/ mm:initialization: mm/large system hash: use vmalloc for size > MAX_ORDER when !hashdist mm/large system hash: clear hashdist when only one node with memory is booted mm:pagealloc: arm64: move jump_label_init() before parse_early_param() Patch series "add init_on_alloc/init_on_free boot options", v10: mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options mm: init: report memory auto-initialization features at boot time mm:vmscan: mm: vmscan: remove double slab pressure by inc'ing sc->nr_scanned mm: vmscan: correct some vmscan counters for THP swapout mm:tools: tools/vm/slabinfo: order command line options tools/vm/slabinfo: add partial slab listing to -X tools/vm/slabinfo: add option to sort by partial slabs tools/vm/slabinfo: add sorting info to help menu mm:proc: proc: use down_read_killable mmap_sem for /proc/pid/maps proc: use down_read_killable mmap_sem for /proc/pid/smaps_rollup proc: use down_read_killable mmap_sem for /proc/pid/pagemap proc: use down_read_killable mmap_sem for /proc/pid/clear_refs proc: use down_read_killable mmap_sem for /proc/pid/map_files mm: use down_read_killable for locking mmap_sem in access_remote_vm mm: smaps: split PSS into components mm: vmalloc: show number of vmalloc pages in /proc/meminfo mm:ras: mm/memory-failure.c: clarify error message mm:oom-kill: mm: memcontrol: use CSS_TASK_ITER_PROCS at mem_cgroup_scan_tasks() mm, oom: refactor dump_tasks for memcg OOMs mm, oom: remove redundant task_in_mem_cgroup() check oom: decouple mems_allowed from oom_unkillable_task mm/oom_kill.c: remove redundant OOM score normalization in select_bad_process()" * akpm: (147 commits) mm/oom_kill.c: remove redundant OOM score normalization in select_bad_process() oom: decouple mems_allowed from oom_unkillable_task mm, oom: remove redundant task_in_mem_cgroup() check mm, oom: refactor dump_tasks for memcg OOMs mm: memcontrol: use CSS_TASK_ITER_PROCS at mem_cgroup_scan_tasks() mm/memory-failure.c: clarify error message mm: vmalloc: show number of vmalloc pages in /proc/meminfo mm: smaps: split PSS into components mm: use down_read_killable for locking mmap_sem in access_remote_vm proc: use down_read_killable mmap_sem for /proc/pid/map_files proc: use down_read_killable mmap_sem for /proc/pid/clear_refs proc: use down_read_killable mmap_sem for /proc/pid/pagemap proc: use down_read_killable mmap_sem for /proc/pid/smaps_rollup proc: use down_read_killable mmap_sem for /proc/pid/maps tools/vm/slabinfo: add sorting info to help menu tools/vm/slabinfo: add option to sort by partial slabs tools/vm/slabinfo: add partial slab listing to -X tools/vm/slabinfo: order command line options mm: vmscan: correct some vmscan counters for THP swapout mm: vmscan: remove double slab pressure by inc'ing sc->nr_scanned ...
2019-07-12scripts/spelling.txt: drop "sepc" from the misspelling listPaul Walmsley
The RISC-V architecture has a register named the "Supervisor Exception Program Counter", or "sepc". This abbreviation triggers checkpatch.pl's misspelling detector, resulting in noise in the checkpatch output. The risk that this noise could cause more useful warnings to be missed seems to outweigh the harm of an occasional misspelling of "spec". Thus drop the "sepc" entry from the misspelling list. [akpm@linux-foundation.org: fix existing "sepc" instances, per Joe] Link: http://lkml.kernel.org/r/20190518210037.13674-1-paul.walmsley@sifive.com Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com> Cc: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-07-11scsi: lpfc: reduce stack size with CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSEArnd Bergmann
The lpfc_debug_dump_all_queues() function repeatedly calls into lpfc_debug_dump_qe() which has a temporary 128 byte buffer. This was fine before the introduction of CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE because each instance could occupy the same stack slot. However, now they each get their own copy, which leads to a huge increase in stack usage as seen from the compiler warning: drivers/scsi/lpfc/lpfc_debugfs.c: In function 'lpfc_debug_dump_all_queues': drivers/scsi/lpfc/lpfc_debugfs.c:6474:1: error: the frame size of 1712 bytes is larger than 100 bytes [-Werror=frame-larger-than=] Avoid this by not marking lpfc_debug_dump_qe() as inline so the compiler can choose to emit a static version of this function when it's needed or otherwise silently drop it. As an added benefit, not inlining multiple copies of this function means we save several kilobytes of .text section, reducing the file size from 47kb to 43. It is somewhat unusual to have a function that is static but not inline in a header file, but this does not cause problems here because it is only used by other inline functions. It would however seem reasonable to move all the lpfc_debug_dump_* functions into lpfc_debugfs.c and not mark them inline as a later cleanup. Fixes: 81a56f6dcd20 ("gcc-plugins: structleak: Generalize to all variable types") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: James Smart <james.smart@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>