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2018-03-30cxgb4: fix error return code in adap_init0()Wei Yongjun
Fix to return a negative error code from the hash filter init error handling case instead of 0, as done elsewhere in this function. Fixes: 5c31254e35a8 ("cxgb4: initialize hash-filter configuration") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-31drivers: macintosh: rack-meter: really fix bogus memsetsAaro Koskinen
We should zero an array using sizeof instead of number of elements. Fixes the following compiler (GCC 7.3.0) warnings: drivers/macintosh/rack-meter.c: In function 'rackmeter_do_pause': drivers/macintosh/rack-meter.c:157:2: warning: 'memset' used with length equal to number of elements without multiplication by element size [-Wmemset-elt-size] drivers/macintosh/rack-meter.c:158:2: warning: 'memset' used with length equal to number of elements without multiplication by element size [-Wmemset-elt-size] Fixes: 4f7bef7a9f69 ("drivers: macintosh: rack-meter: fix bogus memsets") Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-03-31macintosh/adb: Use C99 initializers for struct adb_driver instancesFinn Thain
No change to object files. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-03-30cpufreq: CPPC: Use transition_delay_us depending transition_latencyGeorge Cherian
With commit e948bc8fbee0 (cpufreq: Cap the default transition delay value to 10 ms) the cpufreq was not honouring the delay passed via ACPI (PCCT). Due to which on ARM based platforms using CPPC the cpufreq governor tries to change the frequency of CPUs faster than expected. This leads to continuous error messages like the following. " ACPI CPPC: PCC check channel failed. Status=0 " Earlier (without above commit) the default transition delay was taken form the value passed from PCCT. Use the same value provided by PCCT to set the transition_delay_us. Fixes: e948bc8fbee0 (cpufreq: Cap the default transition delay value to 10 ms) Signed-off-by: George Cherian <george.cherian@cavium.com> Cc: 4.14+ <stable@vger.kernel.org> # 4.14+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-03-30ACPI: acpi_pad: Fix memory leak in power saving threadsLenny Szubowicz
Fix once per second (round_robin_time) memory leak of about 1 KB in each acpi_pad kernel idling thread that is activated. Found by testing with kmemleak. Signed-off-by: Lenny Szubowicz <lszubowi@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-03-30mtd: fsl-quadspi: Distinguish the mtd device namesFabio Estevam
Currently on a imx6sx-sdb board, which has two SPI NOR chips connected to QSPI2 the following output from /proc/mtd is seen: dev: size erasesize name mtd0: 01000000 00010000 "21e4000.qspi" mtd1: 01000000 00010000 "21e4000.qspi" Attempts to partition them on the kernel command line result in both chips with identical (and identically named) partitions, which is an inconvenient behavior. Assign a different mtd->name for each mtd device to avoid this problem. After this change the output from /proc/mtd becomes: dev: size erasesize name mtd0: 01000000 00010000 "21e4000.qspi-0" mtd1: 01000000 00010000 "21e4000.qspi-1" In order to keep mtdparts compatibility keep the mtd->name unchanged when a single SPI NOR is present. Reported-by: David Wolfe <david.wolfe@nxp.com> Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com> Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com> Acked-by: Han Xu <han.xu@nxp.com> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
2018-03-30drm/i915/gvt: Add drm_format_mod updateTina Zhang
Add drm_format_mod update, which is omitted. Fixes: e546e281("drm/i915/gvt: Dmabuf support for GVT-g") Cc: stable@vger.kernel.org Signed-off-by: Tina Zhang <tina.zhang@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
2018-03-30drm/i915/gvt: Disable primary/sprite/cursor plane at virtual display ↵Xiong Zhang
initialization Much error exist in host dmesg during guest boot up with loca display enabled. gvt: vgpu 1: invalid range gmadr 0x0 size 0x0 This error happens when qemu get dmabuf info in case that the virtual display plane is enabled but its base address is an invalid 0, such case may be true before guest enable its plane. At this moment, its state is copied from host where the plane may be enabled. This patch disable primary/sprite/cursor plane at virtual display initialization, so intel_vgpu_decode_primary/cursor/sprite could return early as plane is disabled, then plane base check is skipped and error message disapper. Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
2018-03-30drm/i915/gvt: Delete redundant error message in fb_decode.cXiong Zhang
Much error message exist in host dmesg when guest boot up with local display enabled. [ 167.680011] gvt: vgpu 1: invalid range gmadr 0x0 size 0x0 [ 167.680013] gvt: vgpu 1: invalid gma address: 0 The second error line duplicate with the first error line, so this patch remove this redundant error message and make the next error message much clearer. Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
2018-03-30drm/i915/gvt: Cancel dma map when resetting ggtt entriesChangbin Du
Ditto, don't forget ggtt entries during reset. Signed-off-by: Changbin Du <changbin.du@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
2018-03-30drm/i915/gvt: Missed to cancel dma map for ggtt entriesChangbin Du
We have canceled dma map for ppgtt entries. Also we need to do it for ggtt entries when them are invalidated. This can fix task hung issue as: [13517.791767] INFO: task gvt_service_thr:1081 blocked for more than 120 seconds. [13517.792584] Not tainted 4.14.15+ #3 [13517.793417] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [13517.794267] gvt_service_thr D 0 1081 2 0x80000000 [13517.795132] Call Trace: [13517.795996] ? __schedule+0x493/0x77b [13517.796859] schedule+0x79/0x82 [13517.797740] schedule_preempt_disabled+0x5/0x6 [13517.798614] __mutex_lock.isra.0+0x2b5/0x445 [13517.799504] ? __switch_to_asm+0x24/0x60 [13517.800381] ? intel_gvt_cleanup+0x10/0x10 [13517.801261] ? intel_gvt_schedule+0x19/0x2b9 [13517.802107] intel_gvt_schedule+0x19/0x2b9 [13517.802954] ? intel_gvt_cleanup+0x10/0x10 [13517.803824] gvt_service_thread+0xe3/0x10d [13517.804704] ? wait_woken+0x68/0x68 [13517.805588] kthread+0x118/0x120 [13517.806478] ? kthread_create_on_node+0x3a/0x3a [13517.807381] ? call_usermodehelper_exec_async+0x113/0x11a [13517.808307] ret_from_fork+0x35/0x40 v3: split out ggtt reset case. v2: also unmap ggtt during reset. Signed-off-by: Changbin Du <changbin.du@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
2018-03-29Merge tag 'for-4.16/dm-fixes-4' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm Pull device mapper fixes from Mike Snitzer: - Fix a DM multipath regression introduced in a v4.16-rc6 commit: restore support for loading, and attaching, scsi_dh modules during multipath table load. Otherwise some users may find themselves unable to boot, as was reported today: https://marc.info/?l=linux-scsi&m=152231276114962&w=2 - Fix a DM core ioctl permission check regression introduced in a v4.16-rc5 commit. * tag 'for-4.16/dm-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: dm: fix dropped return code from dm_get_bdev_for_ioctl dm mpath: fix support for loading scsi_dh modules during table load
2018-03-29Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdmaLinus Torvalds
Pull rdma fixes from Jason Gunthorpe: "It has been fairly silent lately on our -rc front. Big queue of patches on the mailing list going to for-next though. Bug fixes: - qedr driver bugfixes causing application hangs, wrong uapi errnos, and a race condition - three syzkaller found bugfixes in the ucma uapi Regression fixes for things introduced in 4.16: - Crash on error introduced in mlx5 UMR flow - Crash on module unload/etc introduced by bad interaction of restrack and mlx5 patches this cycle - Typo in a two line syzkaller bugfix causing a bad regression - Coverity report of nonsense code in hns driver" * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: RDMA/ucma: Introduce safer rdma_addr_size() variants RDMA/hns: ensure for-loop actually iterates and free's buffers RDMA/ucma: Check that device exists prior to accessing it RDMA/ucma: Check that device is connected prior to access it RDMA/rdma_cm: Fix use after free race with process_one_req RDMA/qedr: Fix QP state initialization race RDMA/qedr: Fix rc initialization on CNQ allocation failure RDMA/qedr: fix QP's ack timeout configuration RDMA/ucma: Correct option size check using optlen RDMA/restrack: Move restrack_clean to be symmetrical to restrack_init IB/mlx5: Don't clean uninitialized UMR resources
2018-03-29Merge tag 'mtd/fixes-for-4.16' of git://git.infradead.org/linux-mtdLinus Torvalds
Pull MTD fixes from Boris Brezillon: "Two fixes, one in the atmel NAND driver and another one in the CFI/JEDEC code. Summary: - Fix a bug in Atmel ECC engine driver - Fix a bug in the CFI/JEDEC driver" * tag 'mtd/fixes-for-4.16' of git://git.infradead.org/linux-mtd: mtd: jedec_probe: Fix crash in jedec_read_mfr() mtd: nand: atmel: Fix get_sectorsize() function
2018-03-29dm: fix dropped return code from dm_get_bdev_for_ioctlMike Snitzer
dm_get_bdev_for_ioctl()'s return of 0 or 1 must be the result from prepare_ioctl (1 means the ioctl was issued to a partition, 0 means it wasn't). Unfortunately commit 519049afea ("dm: use blkdev_get rather than bdgrab when issuing pass-through ioctl") reused the variable 'r' to store the return from blkdev_get() that follows prepare_ioctl() -- whereby dropping prepare_ioctl()'s result on the floor. This can lead to an ioctl or persistent reservation being issued to a partition going unnoticed, which implies the extra permission check for CAP_SYS_RAWIO is skipped. Fix this by using a different variable to store blkdev_get()'s return. Fixes: 519049afea ("dm: use blkdev_get rather than bdgrab when issuing pass-through ioctl") Reported-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2018-03-29Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpfDavid S. Miller
Daniel Borkman says: ==================== pull-request: bpf 2018-03-29 The following pull-request contains BPF updates for your *net* tree. The main changes are: 1) Fix nfp to properly check max insn count while emitting instructions in the JIT which was wrongly comparing bytes against number of instructions before, from Jakub. 2) Fix for bpftool to avoid usage of hex numbers in JSON output since JSON doesn't accept hex numbers with 0x prefix, also from Jakub. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-29lightnvm: remove function name in stringsMatias Bjørling
For the sysfs functions, the function names are embedded into their error strings. If the function name later changes, the string may not be updated accordingly. Update the strings to use __func__ to avoid this. Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: remove some unnecessary NULL checksDan Carpenter
Smatch complains that flush_workqueue() dereferences the work queue pointer but then we check if it's NULL on the next line when it's too late. These NULL checks can be removed because the module won't load if we can't allocate the work queues. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: don't recover unwritten linesHans Holmberg
If the line has not been written to, we should not try to recover any data from it, so check the state of the chunks in the line before attempting to read smeta. Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com> Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: implement 2.0 supportJavier González
Implement 2.0 support in pblk. This includes the address formatting and mapping paths, as well as the sysfs entries for them. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: implement get log report chunkJavier González
In preparation of pblk supporting 2.0, implement the get log report chunk in pblk. Also, define the chunk states as given in the 2.0 spec. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: rename ppaf* to addrf*Javier González
In preparation for 2.0 support in pblk, rename variables referring to the address format to addrf and reserve ppaf for the 1.2 path. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: check for supported versionJavier González
At this point, only 1.2 spec is supported, thus check for it. Also, since device-side L2P is only supported in the 1.2 spec, make sure to only check its value under 1.2. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: implement get log report chunk helpersJavier González
The 2.0 spec provides a report chunk log page that can be retrieved using the stangard nvme get log page. This replaces the dedicated get/put bad block table in 1.2. This patch implements the helper functions to allow targets retrieve the chunk metadata using get log page. It makes nvme_get_log_ext available outside of nvme core so that we can use it form lightnvm. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: make address conversions depend on generic deviceJavier González
On address conversions, use the generic device, instead of the target device. This allows to use conversions outside of the target's realm. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: add support for 2.0 address formatJavier González
Add support for 2.0 address format. Also, align address bits for 1.2 and 2.0 to be able to operate on channel and luns without requiring a format conversion. Use a generic address format for this purpose. Also, convert the generic operations to the generic format in pblk. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: normalize geometry nomenclatureJavier González
Normalize nomenclature for naming channels, luns, chunks, planes and sectors as well as derivations in order to improve readability. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: complete geo structure with maxoc*Javier González
Complete the generic geometry structure with the maxoc and maxocpu felds, present in the 2.0 spec. Also, expose them through sysfs. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: add shorten OCSSD version in geoJavier González
Create a shorten version to use in the generic geometry. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: add minor version to generic geometryJavier González
Separate the version between major and minor on the generic geometry and represent it through sysfs in the 2.0 path. The 1.2 path only shows the major version to preserve the existing user space interface. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: simplify geometry structureJavier González
Currently, the device geometry is stored redundantly in the nvm_id and nvm_geo structures at a device level. Moreover, when instantiating targets on a specific number of LUNs, these structures are replicated and manually modified to fit the instance channel and LUN partitioning. Instead, create a generic geometry around nvm_geo, which can be used by (i) the underlying device to describe the geometry of the whole device, and (ii) instances to describe their geometry independently. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: refactor init/exit sequencesJavier González
Refactor init and exit sequences to eliminate dependencies among init modules and improve readability. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: Avoid validation of default op valueHeiner Litz
Fixes: 38401d231de65 ("lightnvm: set target over-provision on create ioctl") Signed-off-by: Heiner Litz <hlitz@ucsc.edu> Reviewed-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: centralize permission check for lightnvm ioctlJohannes Thumshirn
Currently all functions for handling the lightnvm core ioctl commands do a check for CAP_SYS_ADMIN. Change this to fail early in nvm_ctl_ioctl(), so we don't have to duplicate the permission checks all over. Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: fix bad block initializationHeiner Litz
fix reading bad block device information to correctly setup the per line blk_bitmap during lightnvm initialization Signed-off-by: Heiner Litz <hlitz@ucsc.edu> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29nvme: lightnvm: add late setup of block size and metadataMatias Bjørling
The nvme driver sets up the size of the nvme namespace in two steps. First it initializes the device with standard logical block and metadata sizes, and then sets the correct logical block and metadata size. Due to the OCSSD 2.0 specification relies on the namespace to expose these sizes for correct initialization, let it be updated appropriately on the LightNVM side as well. Signed-off-by: Matias Bjørling <mb@lightnvm.io> Acked-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: remove nvm_dev_ops->max_phys_sectMatias Bjørling
The value of max_phys_sect is always static. Instead of defining it in the nvm_dev_ops structure, declare it as a global value. Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: remove max_rq_sizeMatias Bjørling
The field is no longer used. Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: add 2.0 geometry identificationMatias Bjørling
Implement the geometry data structures for 2.0 and enable a drive to be identified as one, including exposing the appropriate 2.0 sysfs entries. Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: flatten nvm_id_group into nvm_idMatias Bjørling
There are no groups in the 2.0 specification, make sure that the nvm_id structure is flattened before 2.0 data structures are added. Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: make 1.2 data structures explicitMatias Bjørling
Make the 1.2 data structures explicit, so it will be easy to identify the 2.0 data structures. Also fix the order of which the nvme_nvm_* are declared, such that they follow the nvme_nvm_command order. Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: refactor bad block identificationJavier González
In preparation for the OCSSD 2.0 spec. bad block identification, refactor the current code to generalize bad block get/set functions and structures. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: prevent race in pblk_rb_flush_point_setHans Holmberg
Make sure that we are not advancing the sync pointer while we're adding bios to the write buffer entry completion list. This race condition results in bios not completing and was identified by a hang when running xfstest generic/113. Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com> Reviewed-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: allow allocation of new lines during shutdownHans Holmberg
When shutting down pblk the write buffer is flushed and if the current line can't fit the data in the write buffer we need to allocate a new line, so remove the check that prevents this. Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com> Reviewed-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: delete writer kick timer before stopping threadHans Holmberg
Unless we delete the timer that wakes up the write thread before we stop the thread we risk re-starting the thread, so delete the timer first. Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com> Reviewed-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: add padding distribution sysfs attributeHans Holmberg
When pblk receives a sync, all data up to that point in the write buffer must be comitted to persistent storage, and as flash memory comes with a minimal write size there is a significant cost involved both in terms of time for completing the sync and in terms of write amplification padded sectors for filling up to the minimal write size. In order to get a better understanding of the costs involved for syncs, Add a sysfs attribute to pblk: padded_dist, showing a normalized distribution of sectors padded. In order to facilitate measurements of specific workloads during the lifetime of the pblk instance, the distribution can be reset by writing 0 to the attribute. Do this by introducing counters for each possible padding: {0..(minimal write size - 1)} and calculate the normalized distribution when showing the attribute. Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com> Signed-off-by: Javier González <javier@cnexlabs.com> Rearranged total_buckets statement in pblk_sysfs_get_padding_dist Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: remove multiple groups in 1.2 data structureMatias Bjørling
Only one id group from the 1.2 specification is supported. Make sure that only the first group is accessible. Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: remove mlc pairs structureMatias Bjørling
The known implementations of the 1.2 specification, and upcoming 2.0 implementation all expose a sequential list of pages to write. Remove the data structure, as it is no longer needed. Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: export write amplification counters to sysfsHans Holmberg
In a SSD, write amplification, WA, is defined as the average number of page writes per user page write. Write amplification negatively affects write performance and decreases the lifetime of the disk, so it's a useful metric to add to sysfs. In plkb's case, the number of writes per user sector is the sum of: (1) number of user writes (2) number of sectors written by the garbage collector (3) number of sectors padded (i.e. due to syncs) This patch adds persistent counters for 1-3 and two sysfs attributes to export these along with WA calculated with five decimals: write_amp_mileage: the accumulated write amplification stats for the lifetime of the pblk instance write_amp_trip: resetable stats to facilitate delta measurements, values reset at creation and if 0 is written to the attribute. 64-bit counters are used as a 32 bit counter would wrap around already after about 17 TB worth of user data. It will take a long long time before the 64 bit sector counters wrap around. The counters are stored after the bad block bitmap in the first emeta sector of each written line. There is plenty of space in the first emeta sector, so we don't need to bump the major version of the line data format. Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com> Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-03-29lightnvm: pblk: check data lines version on recoveryHans Holmberg
As a preparation for future bumps of data line persistent storage versions, we need to start checking the emeta line version during recovery. Also slit up the current emeta/smeta version into two bytes (major,minor). Recovering lines with the same major number as the current pblk data line version must succeed. This means that any changes in the persistent format must be: (1) Backward compatible: if we switch back to and older kernel, recovery of lines stored with major == current_major and minor > current_minor must succeed. (2) Forward compatible: switching to a newer kernel, recovery of lines stored with major=current_major and minor < minor must handle the data format differences gracefully(i.e. initialize new data structures to default values). If we detect lines that have a different major number than the current we must abort recovery. The user must manually migrate the data in this case. Previously the version stored in the emeta header was copied from smeta, which has version 1, so we need to set the minor version to 1. Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com> Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>