- 18 Apr, 2018 33 commits
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Uma Krishnan authored
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>
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by:
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Uma Krishnan authored
Use the PCI VPD services to support reading the VPD data of the underlying adapter. Signed-off-by:
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Uma Krishnan authored
The AFU should be enabled following a successful configuration and disabled near the end of the cleanup path. Signed-off-by:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
On a PERST, the AFU image can be reloaded or left intact. Provide means to set this image reload policy. Signed-off-by:
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Uma Krishnan authored
Provide means to obtain the process element of an adapter context as well as locate an adapter context by file. Signed-off-by:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
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:
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Uma Krishnan authored
Per the OCXL specification, the maximum PASID supported by the AFU is indicated by a field within the configuration space. Similar to acTags, implementations can choose to use any sub-range of PASID within their assigned range. For cxlflash, the entire range is used. Signed-off-by:
Andrew Donnellan <andrew.donnellan@au1.ibm.com> Reviewed-by:
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Uma Krishnan authored
The OCXL specification supports distributing acTags amongst different AFUs and functions on the link. As cxlflash devices are expected to only support a single AFU per function, the entire range that was assigned to the function is also assigned to the AFU. Signed-off-by:
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Uma Krishnan authored
The host AFU configuration is read on the initialization path to identify the features and configuration of the AFU. This data is cached for use in later configuration steps. Signed-off-by:
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Uma Krishnan authored
The OCXL specification supports distributing acTags amongst different AFUs and functions on the link. The platform-specific acTag range for the link is obtained using the OCXL provider services and then assigned to the host function based on implementation. Signed-off-by:
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Uma Krishnan authored
Per the OCXL specification, the underlying host can have multiple AFUs per function with each function supporting its own configuration. The host function configuration is read on the initialization path to evaluate the number of functions present and identify the features and configuration of the functions present. This data is cached for use in later configuration steps. Note that for the OCXL hardware supported by the cxlflash driver, only one AFU per function is expected. Signed-off-by:
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Uma Krishnan authored
When an adapter is initialized, transport specific configuration and MMIO mapping details need to be saved. For CXL, this data is managed by the underlying kernel module. To maintain a separation between the cxlflash core and underlying transports, introduce a new structure to store data specific to the OCXL AFU. Initially only the pointers to underlying PCI and generic devices are added to this new structure - it will be expanded further in future commits. Services to create and destroy this hardware AFU are added and integrated in the probe and exit paths of the driver. Signed-off-by:
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Uma Krishnan authored
Add initial infrastructure to support a new cxlflash transport, OCXL. Claim a dependency on OCXL and add a new file, ocxl_hw.c, which will host the backend routines that are specific to OCXL. Signed-off-by:
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Uma Krishnan authored
Checkpatch throws a warning when the argument identifier names are not included in the function definitions. To avoid these warnings, argument identifiers are added in the existing function definitions. Signed-off-by:
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Matthew R. Ochs authored
The SISLite specification originally defined the context control register with a single field of bits to represent the LISN and also stipulated that the register reset value be 0. The cxlflash driver took advantage of this when programming the LISN for the master contexts via an unconditional write - no other bits were preserved. When unmap support was added, SISLite was updated to define bit 0 of the context control register as a way for the AFU to notify the context owner that unmap operations were supported. Thus the assumptions under which the register is setup changed and the existing unconditional write is clobbering the unmap state for master contexts. This is presently not an issue due to the order in which the context control register is programmed in relation to the unmap bit being queried but should be addressed to avoid a future regression in the event this code is moved elsewhere. To remedy this issue, preserve the bits when programming the LISN field in the context control register. Since the LISN will now be programmed using a read value, assert that the initial state of the LISN field is as described in SISLite (0). Signed-off-by:
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Uma Krishnan authored
The number of interrupts requested for user contexts are stored in the context specific structures and utilized to manage the interrupts. For the master contexts, this number is only used once and therefore not saved. To prepare for future commits where the number of interrupts will be required in more than one place, preserve the value in the master context structure. [mkp: typo in comment] Signed-off-by:
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- 16 Apr, 2018 5 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linuxLinus Torvalds authored
Pull more btrfs updates from David Sterba: "We have queued a few more fixes (error handling, log replay, softlockup) and the rest is SPDX updates that touche almost all files so the diffstat is long" * tag 'for-4.17-part2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: btrfs: Only check first key for committed tree blocks btrfs: add SPDX header to Kconfig btrfs: replace GPL boilerplate by SPDX -- sources btrfs: replace GPL boilerplate by SPDX -- headers Btrfs: fix loss of prealloc extents past i_size after fsync log replay Btrfs: clean up resources during umount after trans is aborted btrfs: Fix possible softlock on single core machines Btrfs: bail out on error during replay_dir_deletes Btrfs: fix NULL pointer dereference in log_dir_items
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git://git.samba.org/sfrench/cifs-2.6Linus Torvalds authored
Pull cifs fixes from Steve French: "SMB3 fixes, a few for stable, and some important cleanup work from Ronnie of the smb3 transport code" * tag '4.17-rc1SMB3-Fixes' of git://git.samba.org/sfrench/cifs-2.6: cifs: change validate_buf to validate_iov cifs: remove rfc1002 hardcoded constants from cifs_discard_remaining_data() cifs: Change SMB2_open to return an iov for the error parameter cifs: add resp_buf_size to the mid_q_entry structure smb3.11: replace a 4 with server->vals->header_preamble_size cifs: replace a 4 with server->vals->header_preamble_size cifs: add pdu_size to the TCP_Server_Info structure SMB311: Improve checking of negotiate security contexts SMB3: Fix length checking of SMB3.11 negotiate request CIFS: add ONCE flag for cifs_dbg type cifs: Use ULL suffix for 64-bit constant SMB3: Log at least once if tree connect fails during reconnect cifs: smb2pdu: Fix potential NULL pointer dereference
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git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsiLinus Torvalds authored
Pull SCSI fixes from James Bottomley: "This is a set of minor (and safe changes) that didn't make the initial pull request plus some bug fixes. The status handling code is actually a running regression from the previous merge window which had an incomplete fix (now reverted) and most of the remaining bug fixes are for problems older than the current merge window" [ Side note: this merge also takes the base kernel git repository to 6+ million objects for the first time. Technically we hit it a couple of merges ago already if you count all the tag objects, but now it reaches 6M+ objects reachable from HEAD. I was joking around that that's when I should switch to 5.0, because 3.0 happened at the 2M mark, and 4.0 happened at 4M objects. But probably not, even if numerology is about as good a reason as any. - Linus ] * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: scsi: devinfo: Add Microsoft iSCSI target to 1024 sector blacklist scsi: cxgb4i: silence overflow warning in t4_uld_rx_handler() scsi: dpt_i2o: Use after free in I2ORESETCMD ioctl scsi: core: Make scsi_result_to_blk_status() recognize CONDITION MET scsi: core: Rename __scsi_error_from_host_byte() into scsi_result_to_blk_status() Revert "scsi: core: return BLK_STS_OK for DID_OK in __scsi_error_from_host_byte()" scsi: aacraid: Insure command thread is not recursively stopped scsi: qla2xxx: Correct setting of SAM_STAT_CHECK_CONDITION scsi: qla2xxx: correctly shift host byte scsi: qla2xxx: Fix race condition between iocb timeout and initialisation scsi: qla2xxx: Avoid double completion of abort command scsi: qla2xxx: Fix small memory leak in qla2x00_probe_one on probe failure scsi: scsi_dh: Don't look for NULL devices handlers by name scsi: core: remove redundant assignment to shost->use_blk_mq -
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuildLinus Torvalds authored
Pull more Kbuild updates from Masahiro Yamada: - pass HOSTLDFLAGS when compiling single .c host programs - build genksyms lexer and parser files instead of using shipped versions - rename *-asn1.[ch] to *.asn1.[ch] for suffix consistency - let the top .gitignore globally ignore artifacts generated by flex, bison, and asn1_compiler - let the top Makefile globally clean artifacts generated by flex, bison, and asn1_compiler - use safer .SECONDARY marker instead of .PRECIOUS to prevent intermediate files from being removed - support -fmacro-prefix-map option to make __FILE__ a relative path - fix # escaping to prepare for the future GNU Make release - clean up deb-pkg by using debian tools instead of handrolled source/changes generation - improve rpm-pkg portability by supporting kernel-install as a fallback of new-kernel-pkg - extend Kconfig listnewconfig target to provide more information * tag 'kbuild-v4.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: kconfig: extend output of 'listnewconfig' kbuild: rpm-pkg: use kernel-install as a fallback for new-kernel-pkg Kbuild: fix # escaping in .cmd files for future Make kbuild: deb-pkg: split generating packaging and build kbuild: use -fmacro-prefix-map to make __FILE__ a relative path kbuild: mark $(targets) as .SECONDARY and remove .PRECIOUS markers kbuild: rename *-asn1.[ch] to *.asn1.[ch] kbuild: clean up *-asn1.[ch] patterns from top-level Makefile .gitignore: move *-asn1.[ch] patterns to the top-level .gitignore kbuild: add %.dtb.S and %.dtb to 'targets' automatically kbuild: add %.lex.c and %.tab.[ch] to 'targets' automatically genksyms: generate lexer and parser during build instead of shipping kbuild: clean up *.lex.c and *.tab.[ch] patterns from top-level Makefile .gitignore: move *.lex.c *.tab.[ch] patterns to the top-level .gitignore kbuild: use HOSTLDFLAGS for single .c executables
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- 15 Apr, 2018 2 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 fixes from Thomas Gleixner: "A set of fixes and updates for x86: - Address a swiotlb regression which was caused by the recent DMA rework and made driver fail because dma_direct_supported() returned false - Fix a signedness bug in the APIC ID validation which caused invalid APIC IDs to be detected as valid thereby bloating the CPU possible space. - Fix inconsisten config dependcy/select magic for the MFD_CS5535 driver. - Fix a corruption of the physical address space bits when encryption has reduced the address space and late cpuinfo updates overwrite the reduced bit information with the original value. - Dominiks syscall rework which consolidates the architecture specific syscall functions so all syscalls can be wrapped with the same macros. This allows to switch x86/64 to struct pt_regs based syscalls. Extend the clearing of user space controlled registers in the entry patch to the lower registers" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/apic: Fix signedness bug in APIC ID validity checks x86/cpu: Prevent cpuinfo_x86::x86_phys_bits adjustment corruption x86/olpc: Fix inconsistent MFD_CS5535 configuration swiotlb: Use dma_direct_supported() for swiotlb_ops syscalls/x86: Adapt syscall_wrapper.h to the new syscall stub naming convention syscalls/core, syscalls/x86: Rename struct pt_regs-based sys_*() to __x64_sys_*() syscalls/core, syscalls/x86: Clean up compat syscall stub naming convention syscalls/core, syscalls/x86: Clean up syscall stub naming convention syscalls/x86: Extend register clearing on syscall entry to lower registers syscalls/x86: Unconditionally enable 'struct pt_regs' based syscalls on x86_64 syscalls/x86: Use 'struct pt_regs' based syscall calling for IA32_EMULATION and x32 syscalls/core: Prepare CONFIG_ARCH_HAS_SYSCALL_WRAPPER=y for compat syscalls syscalls/x86: Use 'struct pt_regs' based syscall calling convention for 64-bit syscalls syscalls/core: Introduce CONFIG_ARCH_HAS_SYSCALL_WRAPPER=y x86/syscalls: Don't pointlessly reload the system call number x86/mm: Fix documentation of module mapping range with 4-level paging x86/cpuid: Switch to 'static const' specifier -
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 pti updates from Thomas Gleixner: "Another series of PTI related changes: - Remove the manual stack switch for user entries from the idtentry code. This debloats entry by 5k+ bytes of text. - Use the proper types for the asm/bootparam.h defines to prevent user space compile errors. - Use PAGE_GLOBAL for !PCID systems to gain back performance - Prevent setting of huge PUD/PMD entries when the entries are not leaf entries otherwise the entries to which the PUD/PMD points to and are populated get lost" * 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/pgtable: Don't set huge PUD/PMD on non-leaf entries x86/pti: Leave kernel text global for !PCID x86/pti: Never implicitly clear _PAGE_GLOBAL for kernel image x86/pti: Enable global pages for shared areas x86/mm: Do not forbid _PAGE_RW before init for __ro_after_init x86/mm: Comment _PAGE_GLOBAL mystery x86/mm: Remove extra filtering in pageattr code x86/mm: Do not auto-massage page protections x86/espfix: Document use of _PAGE_GLOBAL x86/mm: Introduce "default" kernel PTE mask x86/mm: Undo double _PAGE_PSE clearing x86/mm: Factor out pageattr _PAGE_GLOBAL setting x86/entry/64: Drop idtentry's manual stack switch for user entries x86/uapi: Fix asm/bootparam.h userspace compilation errors
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