summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/cxlflash
AgeCommit message (Collapse)AuthorFilesLines
2018-11-07scsi: kill off the legacy IO pathJens Axboe1-6/+0
This removes the legacy (non-mq) IO path for SCSI. Cc: linux-scsi@vger.kernel.org Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Tested-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-08-15Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsiLinus Torvalds2-6/+5
Pull SCSI updates from James Bottomley: "This is mostly updates to the usual drivers: mpt3sas, lpfc, qla2xxx, hisi_sas, smartpqi, megaraid_sas, arcmsr. In addition, with the continuing absence of Nic we have target updates for tcmu and target core (all with reviews and acks). The biggest observable change is going to be that we're (again) trying to switch to mulitqueue as the default (a user can still override the setting on the kernel command line). Other major core stuff is the removal of the remaining Microchannel drivers, an update of the internal timers and some reworks of completion and result handling" * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (203 commits) scsi: core: use blk_mq_run_hw_queues in scsi_kick_queue scsi: ufs: remove unnecessary query(DM) UPIU trace scsi: qla2xxx: Fix issue reported by static checker for qla2x00_els_dcmd2_sp_done() scsi: aacraid: Spelling fix in comment scsi: mpt3sas: Fix calltrace observed while running IO & reset scsi: aic94xx: fix an error code in aic94xx_init() scsi: st: remove redundant pointer STbuffer scsi: qla2xxx: Update driver version to 10.00.00.08-k scsi: qla2xxx: Migrate NVME N2N handling into state machine scsi: qla2xxx: Save frame payload size from ICB scsi: qla2xxx: Fix stalled relogin scsi: qla2xxx: Fix race between switch cmd completion and timeout scsi: qla2xxx: Fix Management Server NPort handle reservation logic scsi: qla2xxx: Flush mailbox commands on chip reset scsi: qla2xxx: Fix unintended Logout scsi: qla2xxx: Fix session state stuck in Get Port DB scsi: qla2xxx: Fix redundant fc_rport registration scsi: qla2xxx: Silent erroneous message scsi: qla2xxx: Prevent sysfs access when chip is down scsi: qla2xxx: Add longer window for chip reset ...
2018-08-14Merge tag 'for-4.19/block-20180812' of git://git.kernel.dk/linux-blockLinus Torvalds2-11/+4
Pull block updates from Jens Axboe: "First pull request for this merge window, there will also be a followup request with some stragglers. This pull request contains: - Fix for a thundering heard issue in the wbt block code (Anchal Agarwal) - A few NVMe pull requests: * Improved tracepoints (Keith) * Larger inline data support for RDMA (Steve Wise) * RDMA setup/teardown fixes (Sagi) * Effects log suppor for NVMe target (Chaitanya Kulkarni) * Buffered IO suppor for NVMe target (Chaitanya Kulkarni) * TP4004 (ANA) support (Christoph) * Various NVMe fixes - Block io-latency controller support. Much needed support for properly containing block devices. (Josef) - Series improving how we handle sense information on the stack (Kees) - Lightnvm fixes and updates/improvements (Mathias/Javier et al) - Zoned device support for null_blk (Matias) - AIX partition fixes (Mauricio Faria de Oliveira) - DIF checksum code made generic (Max Gurtovoy) - Add support for discard in iostats (Michael Callahan / Tejun) - Set of updates for BFQ (Paolo) - Removal of async write support for bsg (Christoph) - Bio page dirtying and clone fixups (Christoph) - Set of bcache fix/changes (via Coly) - Series improving blk-mq queue setup/teardown speed (Ming) - Series improving merging performance on blk-mq (Ming) - Lots of other fixes and cleanups from a slew of folks" * tag 'for-4.19/block-20180812' of git://git.kernel.dk/linux-block: (190 commits) blkcg: Make blkg_root_lookup() work for queues in bypass mode bcache: fix error setting writeback_rate through sysfs interface null_blk: add lock drop/acquire annotation Blk-throttle: reduce tail io latency when iops limit is enforced block: paride: pd: mark expected switch fall-throughs block: Ensure that a request queue is dissociated from the cgroup controller block: Introduce blk_exit_queue() blkcg: Introduce blkg_root_lookup() block: Remove two superfluous #include directives blk-mq: count the hctx as active before allocating tag block: bvec_nr_vecs() returns value for wrong slab bcache: trivial - remove tailing backslash in macro BTREE_FLAG bcache: make the pr_err statement used for ENOENT only in sysfs_attatch section bcache: set max writeback rate when I/O request is idle bcache: add code comments for bset.c bcache: fix mistaken comments in request.c bcache: fix mistaken code comments in bcache.h bcache: add a comment in super.c bcache: avoid unncessary cache prefetch bch_btree_node_get() bcache: display rate debug parameters to 0 when writeback is not running ...
2018-08-13Merge branch 'work.open3' of ↵Linus Torvalds1-20/+4
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs open-related updates from Al Viro: - "do we need fput() or put_filp()" rules are gone - it's always fput() now. We keep track of that state where it belongs - in ->f_mode. - int *opened mess killed - in finish_open(), in ->atomic_open() instances and in fs/namei.c code around do_last()/lookup_open()/atomic_open(). - alloc_file() wrappers with saner calling conventions are introduced (alloc_file_clone() and alloc_file_pseudo()); callers converted, with much simplification. - while we are at it, saner calling conventions for path_init() and link_path_walk(), simplifying things inside fs/namei.c (both on open-related paths and elsewhere). * 'work.open3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (40 commits) few more cleanups of link_path_walk() callers allow link_path_walk() to take ERR_PTR() make path_init() unconditionally paired with terminate_walk() document alloc_file() changes make alloc_file() static do_shmat(): grab shp->shm_file earlier, switch to alloc_file_clone() new helper: alloc_file_clone() create_pipe_files(): switch the first allocation to alloc_file_pseudo() anon_inode_getfile(): switch to alloc_file_pseudo() hugetlb_file_setup(): switch to alloc_file_pseudo() ocxlflash_getfile(): switch to alloc_file_pseudo() cxl_getfile(): switch to alloc_file_pseudo() ... and switch shmem_file_setup() to alloc_file_pseudo() __shmem_file_setup(): reorder allocations new wrapper: alloc_file_pseudo() kill FILE_{CREATED,OPENED} switch atomic_open() and lookup_open() to returning 0 in all success cases document ->atomic_open() changes ->atomic_open(): return 0 in all success cases get rid of 'opened' in path_openat() and the helpers downstream ...
2018-08-05Merge tag 'v4.18-rc6' into for-4.19/block2Jens Axboe2-5/+4
Pull in 4.18-rc6 to get the NVMe core AEN change to avoid a merge conflict down the line. Signed-of-by: Jens Axboe <axboe@kernel.dk>
2018-08-02scsi: cxlflash: Drop unused sense buffersKees Cook2-11/+4
This removes the unused sense buffer in read_cap16() and write_same16(). Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-07-22Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfsLinus Torvalds1-3/+2
Pull vfs fixes from Al Viro: "Fix several places that screw up cleanups after failures halfway through opening a file (one open-coding filp_clone_open() and getting it wrong, two misusing alloc_file()). That part is -stable fodder from the 'work.open' branch. And Christoph's regression fix for uapi breakage in aio series; include/uapi/linux/aio_abi.h shouldn't be pulling in the kernel definition of sigset_t, the reason for doing so in the first place had been bogus - there's no need to expose struct __aio_sigset in aio_abi.h at all" * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: aio: don't expose __aio_sigset in uapi ocxlflash_getfile(): fix double-iput() on alloc_file() failures cxl_getfile(): fix double-iput() on alloc_file() failures drm_mode_create_lease_ioctl(): fix open-coded filp_clone_open()
2018-07-12ocxlflash_getfile(): switch to alloc_file_pseudo()Al Viro1-19/+4
Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2018-07-12alloc_file(): switch to passing O_... flags instead of FMODE_... modeAl Viro1-2/+1
... so that it could set both ->f_flags and ->f_mode, without callers having to set ->f_flags manually. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2018-07-10ocxlflash_getfile(): fix double-iput() on alloc_file() failuresAl Viro1-3/+2
Cc: stable@vger.kernel.org Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2018-07-10scsi: cxlflash: fix assignment of the backend operationsCédric Le Goater1-2/+2
commit cd43c221bb5e ("scsi: cxlflash: Isolate external module dependencies") introduced the use of ifdefs to avoid compilation errors when one of the possible backend driver, CXL or OCXL, is not compiled. Unfortunately, the wrong defines are used and the backend ops are never assigned, leading to a kernel crash in any case when the cxlflash module is loaded. Signed-off-by: Cédric Le Goater <clg@kaod.org> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-06-21scsi: cxlflash: Change return type for fault handlerSouptick Joarder2-6/+5
Use new return type vm_fault_t for fault handler. For now, this is just documenting that the function returns a VM_FAULT value rather than an errno. Once all instances are converted, vm_fault_t will become a distinct type. Ref-> commit 1c8f422059ae ("mm: change return type to vm_fault_t") Previously, VM_FAULT_NOPAGE was returned without verifying return value of vm_insert_pfn. The new inline vmf_insert_pfn() will address this issue by returning correct VM_FAULT_* type from fault handler. Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-05-18scsi: cxlflash: Isolate external module dependenciesUma Krishnan7-7/+16
Depending on the underlying transport, cxlflash has a dependency on either the CXL or OCXL drivers, which are enabled via their Kconfig option. Instead of having a module wide dependency on these config options, it is better to isolate the object modules that are dependent on the CXL and OCXL drivers and adjust the module dependencies accordingly. This commit isolates the object files that are dependent on CXL and/or OCXL. The cxl/ocxl fops used in the core driver are tucked under an ifdef to avoid compilation errors. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-05-18scsi: cxlflash: Abstract hardware dependent assignmentsUma Krishnan2-5/+17
As a staging cleanup to support transport specific builds of the cxlflash module, relocate device dependent assignments to header files. This will avoid littering the core driver with conditional compilation logic. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-05-18scsi: cxlflash: Add include guards to backend.hUma Krishnan1-0/+5
The new header file, backend.h, that was recently added is missing the include guards. This commit adds the guards. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-05-18scsi: cxlflash: Use local mutex for AFU serializationMatthew R. Ochs2-3/+4
AFUs can only process a single AFU command at a time. This is enforced with a global mutex situated within the AFU send routine. As this mutex has a global scope, it has the potential to unnecessarily block commands destined for other AFUs. Instead of using a global mutex, transition the mutex to be per-AFU. This will allow commands to only be blocked by siblings of the same AFU. 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>
2018-05-18scsi: cxlflash: Acquire semaphore before invoking ioctl servicesUma Krishnan1-0/+6
When a superpipe process that makes use of virtual LUNs is terminated or killed abruptly, there is a possibility that the cxlflash driver could hang and deprive other operations on the adapter. The release fop registered to be invoked on a context close, detaches every LUN associated with the context. The underlying service to detach the LUN assumes it has been called with the read semaphore held, and releases the semaphore before any operation that could be time consuming. When invoked without holding the read semaphore, an opportunity is created for the semaphore's count to become negative when it is temporarily released during one of these potential lengthy operations. This negative count results in subsequent acquisition attempts taking forever, leading to the hang. To support the current design point of holding the semaphore on the ioctl() paths, the release fop should acquire it before invoking any ioctl services. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-05-18scsi: cxlflash: Limit the debug logs in the IO pathUma Krishnan1-2/+2
The kernel log can get filled with debug messages from send_cmd_ioarrin() when dynamic debug is enabled for the cxlflash module and there is a lot of legacy I/O traffic. While these messages are necessary to debug issues that involve command tracking, the abundance of data can overwrite other useful data in the log. The best option available is to limit the messages that should serve most of the common use cases. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-05-18scsi: cxlflash: Yield to active send threadsUma Krishnan1-0/+2
The following Oops may be encountered if the device is reset, i.e. EEH recovery, while there is heavy I/O traffic: 59:mon> t [c000200db64bb680] c008000009264c40 cxlflash_queuecommand+0x3b8/0x500 [cxlflash] [c000200db64bb770] c00000000090d3b0 scsi_dispatch_cmd+0x130/0x2f0 [c000200db64bb7f0] c00000000090fdd8 scsi_request_fn+0x3c8/0x8d0 [c000200db64bb900] c00000000067f528 __blk_run_queue+0x68/0xb0 [c000200db64bb930] c00000000067ab80 __elv_add_request+0x140/0x3c0 [c000200db64bb9b0] c00000000068daac blk_execute_rq_nowait+0xec/0x1a0 [c000200db64bba00] c00000000068dbb0 blk_execute_rq+0x50/0xe0 [c000200db64bba50] c0000000006b2040 sg_io+0x1f0/0x520 [c000200db64bbaf0] c0000000006b2e94 scsi_cmd_ioctl+0x534/0x610 [c000200db64bbc20] c000000000926208 sd_ioctl+0x118/0x280 [c000200db64bbcc0] c00000000069f7ac blkdev_ioctl+0x7fc/0xe30 [c000200db64bbd20] c000000000439204 block_ioctl+0x84/0xa0 [c000200db64bbd40] c0000000003f8514 do_vfs_ioctl+0xd4/0xa00 [c000200db64bbde0] c0000000003f8f04 SyS_ioctl+0xc4/0x130 [c000200db64bbe30] c00000000000b184 system_call+0x58/0x6c When there is no room to send the I/O request, the cached room is refreshed by reading the memory mapped command room value from the AFU. The AFU register mapping is refreshed during a reset, creating a race condition that can lead to the Oops above. During a device reset, the AFU should not be unmapped until all the active send threads quiesce. An atomic counter, cmds_active, is currently used to track internal AFU commands and quiesce during reset. This same counter can also be used for the active send threads. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Handle spurious interruptsUma Krishnan2-0/+12
The following Oops can occur when there is heavy I/O traffic and the host is reset by a tool such as sg_reset. [c000200fff3fbc90] c00800001690117c process_cmd_doneq+0x104/0x500 [cxlflash] (unreliable) [c000200fff3fbd80] c008000016901648 cxlflash_rrq_irq+0xd0/0x150 [cxlflash] [c000200fff3fbde0] c000000000193130 __handle_irq_event_percpu+0xa0/0x310 [c000200fff3fbea0] c0000000001933d8 handle_irq_event_percpu+0x38/0x90 [c000200fff3fbee0] c000000000193494 handle_irq_event+0x64/0xb0 [c000200fff3fbf10] c000000000198ea0 handle_fasteoi_irq+0xc0/0x230 [c000200fff3fbf40] c00000000019182c generic_handle_irq+0x4c/0x70 [c000200fff3fbf60] c00000000001794c __do_irq+0x7c/0x1c0 [c000200fff3fbf90] c00000000002a390 call_do_irq+0x14/0x24 [c000200e5828fab0] c000000000017b2c do_IRQ+0x9c/0x130 [c000200e5828fb00] c000000000009b04 h_virt_irq_common+0x114/0x120 When a context is reset, the pending commands are flushed and the AFU is notified. Before the AFU handles this request there could be command completion interrupts queued to PHB which are yet to be delivered to the context. In this scenario, a context could receive an interrupt for a command that has been flushed, leading to a possible crash when the memory for the flushed command is accessed. To resolve this problem, a boolean will indicate if the hardware queue is ready to process interrupts or not. This can be evaluated in the interrupt handler before proessing an interrupt. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Remove commmands from pending list on timeoutUma Krishnan1-0/+14
The following Oops can occur if an internal command sent to the AFU does not complete within the timeout: [c000000ff101b810] c008000016020d94 term_mc+0xfc/0x1b0 [cxlflash] [c000000ff101b8a0] c008000016020fb0 term_afu+0x168/0x280 [cxlflash] [c000000ff101b930] c0080000160232ec cxlflash_pci_error_detected+0x184/0x230 [cxlflash] [c000000ff101b9e0] c00800000d95d468 cxl_vphb_error_detected+0x90/0x150[cxl] [c000000ff101ba20] c00800000d95f27c cxl_pci_error_detected+0xa4/0x240 [cxl] [c000000ff101bac0] c00000000003eaf8 eeh_report_error+0xd8/0x1b0 [c000000ff101bb20] c00000000003d0b8 eeh_pe_dev_traverse+0x98/0x170 [c000000ff101bbb0] c00000000003f438 eeh_handle_normal_event+0x198/0x580 [c000000ff101bc60] c00000000003fba4 eeh_handle_event+0x2a4/0x338 [c000000ff101bd10] c0000000000400b8 eeh_event_handler+0x1f8/0x200 [c000000ff101bdc0] c00000000013da48 kthread+0x1a8/0x1b0 [c000000ff101be30] c00000000000b528 ret_from_kernel_thread+0x5c/0xb4 When an internal command times out, the command buffer is freed while it is still in the pending commands list of the context. This corrupts the list and when the context is cleaned up, a crash is encountered. To resolve this issue, when an AFU command or TMF command times out, the command should be deleted from the hardware queue pending command list before freeing the buffer. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Synchronize reset and remove opsUma Krishnan1-3/+3
The following Oops can be encountered if a device removal or system shutdown is initiated while an EEH recovery is in process: [c000000ff2f479c0] c008000015256f18 cxlflash_pci_slot_reset+0xa0/0x100 [cxlflash] [c000000ff2f47a30] c00800000dae22e0 cxl_pci_slot_reset+0x168/0x290 [cxl] [c000000ff2f47ae0] c00000000003ef1c eeh_report_reset+0xec/0x170 [c000000ff2f47b20] c00000000003d0b8 eeh_pe_dev_traverse+0x98/0x170 [c000000ff2f47bb0] c00000000003f80c eeh_handle_normal_event+0x56c/0x580 [c000000ff2f47c60] c00000000003fba4 eeh_handle_event+0x2a4/0x338 [c000000ff2f47d10] c0000000000400b8 eeh_event_handler+0x1f8/0x200 [c000000ff2f47dc0] c00000000013da48 kthread+0x1a8/0x1b0 [c000000ff2f47e30] c00000000000b528 ret_from_kernel_thread+0x5c/0xb4 The remove handler frees AFU memory while the EEH recovery is in progress, leading to a race condition. This can result in a crash if the recovery thread tries to access this memory. To resolve this issue, the cxlflash remove handler will evaluate the device state and yield to any active reset or probing threads. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Enable OCXL operationsUma Krishnan2-2/+8
This commit enables the OCXL operations for the OCXL devices. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support AFU resetUma Krishnan1-0/+17
The cxlflash core driver resets the AFU when the master contexts are created in the initialization or recovery paths. Today, the OCXL provider service to perform this operation is pending implementation. To avoid a crash due to a missing fop, log an error once and return success to continue with execution. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Register for translation errorsUma Krishnan2-2/+33
While enabling a context on the link, a predefined callback can be registered with the OCXL provider services to be notified on translation errors. These errors can in turn be passed back to the user on a read operation. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Introduce OCXL context state machineUma Krishnan2-3/+64
In order to protect the OCXL hardware contexts from getting clobbered, a simple state machine is added to indicate when a context is in open, close or start state. The expected states are validated throughout the code to prevent illegal operations on a context. A mutex is added to protect writes to the context state field. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Update synchronous interrupt status bitsUma Krishnan1-14/+21
The SISLite specification has been updated to define new synchronous interrupt status bits. These bits are set by the AFU when a given PASID or EA is bad and a synchronous interrupt is triggered. The SISLite header file is updated to support these new bits. Note that there are also some formatting updates to some of the existing bits to allow all of the definitions to line up uniformly. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Setup LISNs for master contextsUma Krishnan1-0/+21
Similar to user contexts, master contexts also require that the per-context LISN registers be programmed for certain AFUs. The mapped trigger page is obtained from underlying transport and registered with AFU for each master context. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Setup LISNs for user contextsUma Krishnan3-0/+24
The SISLite specification has been updated for OCXL to support communicating data to generate AFU interrupts to the AFU. This includes a new capability bit that is advertised for OCXL AFUs and new registers to hold the object handle and translation PASID of each interrupt. For Power, the object handle is the mapped trigger page. Note that because these mappings are kernel only, the PASID of a kernel context must be used to satisfy the translation. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Introduce object handle fopUma Krishnan3-0/+26
OCXL requires that AFUs use an opaque object handle to represent an AFU interrupt. The specification does not provide a common means to communicate the object handle to the AFU - each AFU must define this within the AFU specification. To support this model, the object handle must be passed back to the core driver as it manages the AFU specification (SISLite) for cxlflash. Note that for Power systems, the object handle is the effective address of the trigger page. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support file descriptor mappingUma Krishnan1-0/+26
The cxlflash core fop API requires a way to invoke the fault and release handlers of underlying transports using their native file-based APIs. This provides the core with the ability to insert selectively itself into the processing stream of these operations for cleanup. Implement these two fops to map and release when requested. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support adapter context mmap and releaseUma Krishnan1-0/+72
The cxlflash userspace API requires that users be able to mmap and release the adapter context. Support mapping by implementing the AFU mmap fop to map the context MMIO space and install the corresponding page table entry upon page fault. Similarly, implement the AFU release fop to terminate and clean up the context when invoked. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support adapter context readingUma Krishnan1-0/+94
The cxlflash userspace API requires that users be able to read the adapter context for any pending events or interrupts from the AFU. Support reading various events by implementing the AFU read fop to copy out event data. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support adapter context pollingUma Krishnan2-2/+57
The cxlflash userspace API requires that users be able to poll the adapter context for any pending events or interrupts from the AFU. Support polling on various events by implementing the AFU poll fop using a waitqueue. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support starting user contextsUma Krishnan2-2/+100
User contexts request interrupts and are started using the "start work" interface. Populate the start_work() fop to allocate and map interrupts before starting the user context. As part of starting the context, update the user process identification logic to properly derive the data required by the SPA. Also, introduce a skeleton interrupt handler using a bitmap, flag, and spinlock to track interrupts. This handler will be expanded in future commits. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support AFU interrupt mapping and registrationUma Krishnan2-0/+122
Add support to map and unmap the irq space and manage irq registrations with the kernel for each allocated AFU interrupt. Also support mapping the physical trigger page to obtain an effective address that will be provided to the cxlflash core in a future commit. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support AFU interrupt managementUma Krishnan2-0/+114
Add support to allocate and free AFU interrupts using the OCXL provider services. The trigger page returned upon successful allocation will be mapped and exposed to the cxlflash core in a future commit. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support process element lifecycleUma Krishnan1-2/+50
As part of the context lifecycle, the associated process element within the Shared Process Area (SPA) of the link must be updated. Each process is defined by various parameters (pid, tid, PASID mm) that are stored in the SPA upon starting a context and invalidated when a context is stopped. Use the OCXL provider services to configure the SPA with the appropriate data that is unique to the process when starting a context. Initially only kernel contexts are supported and therefore these process values are not applicable. Note that the OCXL service used has an optional callback for translation fault error notification. While not used here, it will be expanded in a future commit. Also add a service to stop a context by terminating the corresponding PASID and remove the process element from the SPA. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Setup OCXL transaction layerUma Krishnan1-0/+10
The first function of the link needs to configure the transaction layer between the host and device. This is accomplished by a call to the OCXL provider services. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Setup function OCXL linkUma Krishnan2-3/+23
After reading and modifying the function configuration, setup the OCXL link using the OCXL provider services. The link is released when the adapter is unconfigured. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support reading adapter VPD dataUma Krishnan1-0/+15
Use the PCI VPD services to support reading the VPD data of the underlying adapter. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support AFU state togglingUma Krishnan1-0/+9
The AFU should be enabled following a successful configuration and disabled near the end of the cleanup path. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support process specific mappingsUma Krishnan1-0/+24
Once the context is started, the assigned MMIO space can be mapped and unmapped. Provide means to map and unmap the context MMIO space. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support starting an adapter contextUma Krishnan2-0/+42
Once the adapter context is created, it needs to be started by assigning the MMIO space for the context and by enabling the process element in the link. This commit adds the skeleton for starting the context and assigns the context specific MMIO space. Master contexts have access to the global MMIO space while the rest have access to the context specific space. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: MMIO map the AFUUma Krishnan2-1/+77
When the AFU is configured, the global and per process MMIO regions are presented by the configuration space. Save these regions and map the global MMIO region that is used to access all of the control and provisioning data in the AFU. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support image reload policy modificationUma Krishnan2-0/+14
On a PERST, the AFU image can be reloaded or left intact. Provide means to set this image reload policy. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support adapter context discoveryUma Krishnan1-0/+26
Provide means to obtain the process element of an adapter context as well as locate an adapter context by file. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Support adapter file descriptors for OCXLUma Krishnan2-0/+201
Allocate a file descriptor for an adapter context when requested. In order to allocate inodes for the file descriptors, a pseudo filesystem is created and used. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Use IDR to manage adapter contextsUma Krishnan2-2/+21
A range of PASIDs are used as identifiers for the adapter contexts. These contexts may be destroyed and created randomly. Use an IDR to keep track of contexts that are in use and assign a unique identifier to new ones. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-04-18scsi: cxlflash: Adapter context support for OCXLUma Krishnan2-0/+96
Add support to create and release the adapter contexts for OCXL and provide means to specify certain contexts as a master. The existing cxlflash core has a design requirement that each host will have a single host context available by default. To satisfy this requirement, one host adapter context is created when the hardware AFU is initialized. This is returned by the get_context() fop. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 13:36:19 +0000