- 09 Apr, 2017 13 commits
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Marc Zyngier authored
Both pmu_*_el0_disabled() and pmu_counter_idx_valid() perform checks on the validity of an access, but only return a boolean indicating if the access is valid or not. Let's allow these functions to also inject an UNDEF exception if the access was illegal. Reviewed-by:
Christoffer Dall <cdall@linaro.org> Signed-off-by:
Marc Zyngier <marc.zyngier@arm.com>
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Marc Zyngier authored
There is a lot of duplication in the pmu_*_el0_disabled helpers, and as we're going to modify them shortly, let's move all the common stuff in a single function. No functional change. Reviewed-by:
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Christoffer Dall authored
There is no need to call any functions to fold LRs when we don't use any LRs and we don't need to mess with overflow flags, take spinlocks, or prune the AP list if the AP list is empty. Note: list_empty is a single atomic read (uses READ_ONCE) and can therefore check if a list is empty or not without the need to take the spinlock protecting the list. Reviewed-by:
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Christoffer Dall authored
Now when we do an early init of the static parts of the VGIC data structures, we can do things like checking if the AP lists are empty directly without having to explicitly check if the vgic is initialized and reduce a bit of work in our critical path. Acked-by:
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Christoffer Dall authored
Implement early initialization for both the distributor and the CPU interfaces. The basic idea is that even though the VGIC is not functional or not requested from user space, the critical path of the run loop can still call VGIC functions that just won't do anything, without them having to check additional initialization flags to ensure they don't look at uninitialized data structures. Acked-by:
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Christoffer Dall authored
We don't use these fields anymore so let's nuke them completely. Acked-by:
Christoffer Dall <christoffer.dall@linaro.org>
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Christoffer Dall authored
Now when we don't look at the MISR and EISR values anymore, we can get rid of the logic to save them in the GIC save/restore code. Acked-by:
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Christoffer Dall authored
Since we always read back the LRs that we wrote to the guest and the MISR and EISR registers simply provide a summary of the configuration of the bits in the LRs, there is really no need to read back those status registers and process them. We might as well just signal the notifyfd when folding the LR state and save some cycles in the process. We now clear the underflow bit in the fold_lr_state functions as we only need to clear this bit if we had used all the LRs, so this is as good a place as any to do that work. Reviewed-by:
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Christoffer Dall authored
We currently assume that all the interrupts in our AP list will be queued to LRs, but that's not necessarily the case, because some of them could have been migrated away to different VCPUs and only the VCPU thread itself can remove interrupts from its AP list. Therefore, slightly change the logic to only setting the underflow interrupt when we actually run out of LRs. As it turns out, this allows us to further simplify the handling in vgic_sync_hwstate in later patches. Acked-by:
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Christoffer Dall authored
There is no need to calculate and maintain live_lrs when we always populate the lowest numbered LRs first on every entry and clear all LRs on every exit. Acked-by:
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Shih-Wei Li authored
We do not need to flush vgic states in each world switch unless there is pending IRQ queued to the vgic's ap list. We can thus reduce the overhead by not grabbing the spinlock and not making the extra function call to vgic_flush_lr_state. Note: list_empty is a single atomic read (uses READ_ONCE) and can therefore check if a list is empty or not without the need to take the spinlock protecting the list. Reviewed-by:
Shih-Wei Li <shihwei@cs.columbia.edu> Signed-off-by:
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Christoffer Dall authored
We don't have to save/restore the VMCR on every entry to/from the guest, since on GICv2 we can access the control interface from EL1 and on VHE systems with GICv3 we can access the control interface from KVM running in EL2. GICv3 systems without VHE becomes the rare case, which has to save/restore the register on each round trip. Note that userspace accesses may see out-of-date values if the VCPU is running while accessing the VGIC state via the KVM device API, but this is already the case and it is up to userspace to quiesce the CPUs before reading the CPU registers from the GIC for an up-to-date view. Reviewed-by:
Christoffer Dall <cdall@cs.columbia.edu> Signed-off-by:
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Suzuki K Poulose authored
In order to perform an operation on a gpa range, we currently iterate over each page in a user memory slot for the given range. This is inefficient while dealing with a big range (e.g, a VMA), especially while unmaping a range. At present, with stage2 unmap on a range with a hugepage backed region, we clear the PMD when we unmap the first page in the loop. The remaining iterations simply traverse the page table down to the PMD level only to see that nothing is in there. This patch reworks the code to invoke the callback handlers on the biggest range possible within the memory slot to to reduce the number of times the handler is called. Cc: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by:
Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by:
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- 20 Mar, 2017 5 commits
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Linus Torvalds authored
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Linus Torvalds authored
This BUG_ON() triggered for me once at shutdown, and I don't see a reason for the check. The code correctly checks whether the swap slot cache is usable or not, so an uninitialized swap slot cache is not actually problematic afaik. I've temporarily just switched the BUG_ON() to a WARN_ON_ONCE(), since I'm not sure why that seemingly pointless check was there. I suspect the real fix is to just remove it entirely, but for now we'll warn about it but not bring the machine down. Cc: "Huang, Ying" <ying.huang@intel.com> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by:Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linuxLinus Torvalds authored
Pull more powerpc fixes from Michael Ellerman: "A couple of minor powerpc fixes for 4.11: - wire up statx() syscall - don't print a warning on memory hotplug when HPT resizing isn't available Thanks to: David Gibson, Chandan Rajendra" * tag 'powerpc-4.11-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/pseries: Don't give a warning when HPT resizing isn't available powerpc: Wire up statx() syscall -
git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linuxLinus Torvalds authored
Pull parisc fixes from Helge Deller: - Mikulas Patocka added support for R_PARISC_SECREL32 relocations in modules with CONFIG_MODVERSIONS. - Dave Anglin optimized the cache flushing for vmap ranges. - Arvind Yadav provided a fix for a potential NULL pointer dereference in the parisc perf code (and some code cleanups). - I wired up the new statx system call, fixed some compiler warnings with the access_ok() macro and fixed shutdown code to really halt a system at shutdown instead of crashing & rebooting. * 'parisc-4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Fix system shutdown halt parisc: perf: Fix potential NULL pointer dereference parisc: Avoid compiler warnings with access_ok() parisc: Wire up statx system call parisc: Optimize flush_kernel_vmap_range and invalidate_kernel_vmap_range parisc: support R_PARISC_SECREL32 relocation in modules
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git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pendingLinus Torvalds authored
Pull SCSI target fixes from Nicholas Bellinger: "The bulk of the changes are in qla2xxx target driver code to address various issues found during Cavium/QLogic's internal testing (stable CC's included), along with a few other stability and smaller miscellaneous improvements. There are also a couple of different patch sets from Mike Christie, which have been a result of his work to use target-core ALUA logic together with tcm-user backend driver. Finally, a patch to address some long standing issues with pass-through SCSI export of TYPE_TAPE + TYPE_MEDIUM_CHANGER devices, which will make folks using physical (or virtual) magnetic tape happy" * git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (28 commits) qla2xxx: Update driver version to 9.00.00.00-k qla2xxx: Fix delayed response to command for loop mode/direct connect. qla2xxx: Change scsi host lookup method. qla2xxx: Add DebugFS node to display Port Database qla2xxx: Use IOCB interface to submit non-critical MBX. qla2xxx: Add async new target notification qla2xxx: Export DIF stats via debugfs qla2xxx: Improve T10-DIF/PI handling in driver. qla2xxx: Allow relogin to proceed if remote login did not finish qla2xxx: Fix sess_lock & hardware_lock lock order problem. qla2xxx: Fix inadequate lock protection for ABTS. qla2xxx: Fix request queue corruption. qla2xxx: Fix memory leak for abts processing qla2xxx: Allow vref count to timeout on vport delete. tcmu: Convert cmd_time_out into backend device attribute tcmu: make cmd timeout configurable tcmu: add helper to check if dev was configured target: fix race during implicit transition work flushes target: allow userspace to set state to transitioning target: fix ALUA transition timeout handling ...
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- 19 Mar, 2017 15 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimmLinus Torvalds authored
Pull device-dax fixes from Dan Williams: "The device-dax driver was not being careful to handle falling back to smaller fault-granularity sizes. The driver already fails fault attempts that are smaller than the device's alignment, but it also needs to handle the cases where a larger page mapping could be established. For simplicity of the immediate fix the implementation just signals VM_FAULT_FALLBACK until fault-size == device-alignment. One fix is for -stable to address pmd-to-pte fallback from the original implementation, another fix is for the new (introduced in 4.11-rc1) pud-to-pmd regression, and a typo fix comes along for the ride. These have received a build success notification from the kbuild robot" * 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: device-dax: fix debug output typo device-dax: fix pud fault fallback handling device-dax: fix pmd/pte fault fallback handling
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Himanshu Madhani authored
Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> signed-off-by:
Giridhar Malavali <giridhar.malavali@cavium.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org>
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Quinn Tran authored
Current driver wait for FW to be in the ready state before processing in-coming commands. For Arbitrated Loop or Point-to- Point (not switch), FW Ready state can take a while. FW will transition to ready state after all Nports have been logged in. In the mean time, certain initiators have completed the login and starts IO. Driver needs to start processing all queues if FW is already started. Signed-off-by:
Quinn Tran <quinn.tran@cavium.com> Signed-off-by:
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Quinn Tran authored
For target mode, when new scsi command arrive, driver first performs a look up of the SCSI Host. The current look up method is based on the ALPA portion of the NPort ID. For Cisco switch, the ALPA can not be used as the index. Instead, the new search method is based on the full value of the Nport_ID via btree lib. Signed-off-by:
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Himanshu Madhani authored
Signed-off-by:
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Quinn Tran authored
The Mailbox interface is currently over subscribed. We like to reserve the Mailbox interface for the chip managment and link initialization. Any non essential Mailbox command will be routed through the IOCB interface. The IOCB interface is able to absorb more commands. Following commands are being routed through IOCB interface - Get ID List (007Ch) - Get Port DB (0064h) - Get Link Priv Stats (006Dh) Signed-off-by:
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Quinn Tran authored
Signed-off-by:
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Anil Gurumurthy authored
Signed-off-by:
Anil Gurumurthy <anil.gurumurthy@cavium.com> Signed-off-by:
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Quinn Tran authored
Add routines to support T10 DIF tag. Signed-off-by:
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Quinn Tran authored
If the remote port have started the login process, then the PLOGI and PRLI should be back to back. Driver will allow the remote port to complete the process. For the case where the remote port decide to back off from sending PRLI, this local port sets an expiration timer for the PRLI. Once the expiration time passes, the relogin retry logic is allowed to go through and perform login with the remote port. Signed-off-by:
Quinn Tran <quinn.tran@qlogic.com> Signed-off-by:
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Quinn Tran authored
The main lock that needs to be held for CMD or TMR submission to upper layer is the sess_lock. The sess_lock is used to serialize cmd submission and session deletion. The addition of hardware_lock being held is not necessary. This patch removes hardware_lock dependency from CMD/TMR submission. Use hardware_lock only for error response in this case. Path1 CPU0 CPU1 ---- ---- lock(&(&ha->tgt.sess_lock)->rlock); lock(&(&ha->hardware_lock)->rlock); lock(&(&ha->tgt.sess_lock)->rlock); lock(&(&ha->hardware_lock)->rlock); Path2/deadlock *** DEADLOCK *** Call Trace: dump_stack+0x85/0xc2 print_circular_bug+0x1e3/0x250 __lock_acquire+0x1425/0x1620 lock_acquire+0xbf/0x210 _raw_spin_lock_irqsave+0x53/0x70 qlt_sess_work_fn+0x21d/0x480 [qla2xxx] process_one_work+0x1f4/0x6e0 Cc: <stable@vger.kernel.org> Cc: Bart Van Assche <Bart.VanAssche@sandisk.com> Reported-by:Bart Van Assche <Bart.VanAssche@sandisk.com> Signed-off-by:
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Quinn Tran authored
Normally, ABTS is sent to Target Core as Task MGMT command. In the case of error, qla2xxx needs to send response, hardware_lock is required to prevent request queue corruption. Cc: <stable@vger.kernel.org> Signed-off-by:
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Quinn Tran authored
When FW notify driver or driver detects low FW resource, driver tries to send out Busy SCSI Status to tell Initiator side to back off. During the send process, the lock was not held. Cc: <stable@vger.kernel.org> Signed-off-by:
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Quinn Tran authored
Cc: <stable@vger.kernel.org> Signed-off-by:
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Joe Carnuccio authored
Cc: <stable@vger.kernel.org> Signed-off-by:
Joe Carnuccio <joe.carnuccio@cavium.com> Signed-off-by:
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- 18 Mar, 2017 7 commits
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Nicholas Bellinger authored
Instead of putting cmd_time_out under ../target/core/user_0/foo/control, which has historically been used by parameters needed for initial backend device configuration, go ahead and move cmd_time_out into a backend device attribute. In order to do this, tcmu_module_init() has been updated to create a local struct configfs_attribute **tcmu_attrs, that is based upon the existing passthrough_attrib_attrs along with the new cmd_time_out attribute. Once **tcm_attrs has been setup, go ahead and point it at tcmu_ops->tb_dev_attrib_attrs so it's picked up by target-core. Also following MNC's previous change, ->cmd_time_out is stored in milliseconds but exposed via configfs in seconds. Also, note this patch restricts the modification of ->cmd_time_out to before + after the TCMU device has been configured, but not while it has active fabric exports. Cc: Mike Christie <mchristi@redhat.com> Signed-off-by: -
Mike Christie authored
A single daemon could implement multiple types of devices using multuple types of real devices that may not support restarting from crashes and/or handling tcmu timeouts. This makes the cmd timeout configurable, so handlers that do not support it can turn if off for now. Signed-off-by:
Mike Christie <mchristi@redhat.com> Signed-off-by:
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Mike Christie authored
This adds a helper to check if the dev was configured. It will be used in the next patch to prevent updates to some config settings after the device has been setup. Signed-off-by:
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git://github.com/openrisc/linuxLinus Torvalds authored
Pull OpenRISC fixes from Stafford Horne: "OpenRISC fixes for build issues that were exposed by kbuild robots after 4.11 merge. All from allmodconfig builds. This includes: - bug in the handling of 8-byte get_user() calls - module build failure due to multile missing symbol exports" * tag 'openrisc-for-linus' of git://github.com/openrisc/linux: openrisc: Export symbols needed by modules openrisc: fix issue handling 8 byte get_user calls openrisc: xchg: fix `computed is not used` warning
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Mike Christie authored
This fixes the following races: 1. core_alua_do_transition_tg_pt could have read tg_pt_gp_alua_access_state and gone into this if chunk: if (!explicit && atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == ALUA_ACCESS_STATE_TRANSITION) { and then core_alua_do_transition_tg_pt_work could update the state. core_alua_do_transition_tg_pt would then only set tg_pt_gp_alua_pending_state and the tg_pt_gp_alua_access_state would not get updated with the second calls state. 2. core_alua_do_transition_tg_pt could be setting tg_pt_gp_transition_complete while the tg_pt_gp_transition_work is already completing. core_alua_do_transition_tg_pt then waits on the completion that will never be called. To handle these issues, we just call flush_work which will return when core_alua_do_transition_tg_pt_work has completed so there is no need to do the complete/wait. And, if core_alua_do_transition_tg_pt_work was running, instead of trying to sneak in the state change, we just schedule up another core_alua_do_transition_tg_pt_work call. Note that this does not handle a possible race where there are multiple threads call core_alua_do_transition_tg_pt at the same time. I think we need a mutex in target_tg_pt_gp_alua_access_state_store. Signed-off-by: -
Mike Christie authored
Userspace target_core_user handlers like tcmu-runner may want to set the ALUA state to transitioning while it does implicit transitions. This patch allows that state when set from configfs. Signed-off-by:
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Mike Christie authored
The implicit transition time tells initiators the min time to wait before timing out a transition. We currently schedule the transition to occur in tg_pt_gp_implicit_trans_secs seconds so there is no room for delays. If core_alua_do_transition_tg_pt_work->core_alua_update_tpg_primary_metadata needs to write out info to a remote file, then the initiator can easily time out the operation. Signed-off-by:
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