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* Remove GEOM_SCHED class and gsched tool.Alexander Motin2019-12-291-5/+2
| | | | | | | | | | | | | | | | | | This code was not actively maintained since it was introduced 10 years ago. It lacks support for many later GEOM features, such as direct dispatch, unmapped I/O, stripesize/stripeoffset, resize, etc. Plus it is the only remaining use of GEOM nstart/nend request counters, used there to implement live insertion/removal, questionable by itself. Plus, as number of people commented, GEOM is not the best place for I/O scheduler, since it has limited information about layers both above and below it, required for efficient scheduling. Plus with the modern shift to SSDs there is just no more significant need for this kind of scheduling. Approved by: imp, phk, luigi Relnotes: yes Notes: svn path=/head/; revision=356185
* Add BIO_SPEEDUPWarner Losh2019-12-171-0/+4
| | | | | | | | | | | | | | | | | | | Add BIO_SPEEDUP bio command and g_io_speedup wrapper. It tells the lower layers that the upper layers are dealing with some shortage (dirty pages and/or disk blocks). The lower layers should do what they can to speed up anything that's been delayed. The first use will be to tell the CAM I/O scheduler that any TRIM shaping should be short-circuited because the system needs blocks. We'll also call it when there's too many resources used by UFS. Reviewed by: kirk, kib Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D18351 Notes: svn path=/head/; revision=355835
* Add printing of b_ioflags to DDB `show buffer' command.Kirk McKusick2019-01-251-0/+3
| | | | | | | Sponsored by: Netflix Notes: svn path=/head/; revision=343457
* Implement a 'car limit' for bioq.Warner Losh2018-06-131-0/+2
| | | | | | | | | | | | | Allow one to implement a 'car limit' for bioq_disksort. debug.bioq_batchsize sets the size of car limit. Every time we queue that many requests, we start over so that we limit the latency for requests when the software queue depths are large. A value of '0', the default, means to revert to the old behavior. Sponsored by: Netflix Notes: svn path=/head/; revision=335066
* sys: further adoption of SPDX licensing ID tags.Pedro F. Giffuni2017-11-201-0/+2
| | | | | | | | | | | | | | | | | Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point. Notes: svn path=/head/; revision=326023
* Renumber copyright clause 4Warner Losh2017-02-281-1/+1
| | | | | | | | | | | | Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96 Notes: svn path=/head/; revision=314436
* Add BUF_TRACKING and FULL_BUF_TRACKING buffer debuggingConrad Meyer2016-10-311-0/+20
| | | | | | | | | | | | | | | | | | Upstream the BUF_TRACKING and FULL_BUF_TRACKING buffer debugging code. This can be handy in tracking down what code touched hung bios and bufs last. The full history is especially useful, but adds enough bloat that it shouldn't be enabled in release builds. Function names (or arbitrary string constants) are tracked in a fixed-size ring in bufs. Bios gain a pointer to the upper buf for tracking. SCSI CCBs gain a pointer to the upper bio for tracking. Reviewed by: markj Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D8366 Notes: svn path=/head/; revision=308155
* Remove unused bio_taskqueue().Edward Tomasz Napierala2016-09-191-2/+0
| | | | | | | MFC after: 1 month Notes: svn path=/head/; revision=305988
* Add support for managing Shingled Magnetic Recording (SMR) drives.Kenneth D. Merry2016-05-191-6/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This change includes support for SCSI SMR drives (which conform to the Zoned Block Commands or ZBC spec) and ATA SMR drives (which conform to the Zoned ATA Command Set or ZAC spec) behind SAS expanders. This includes full management support through the GEOM BIO interface, and through a new userland utility, zonectl(8), and through camcontrol(8). This is now ready for filesystems to use to detect and manage zoned drives. (There is no work in progress that I know of to use this for ZFS or UFS, if anyone is interested, let me know and I may have some suggestions.) Also, improve ATA command passthrough and dispatch support, both via ATA and ATA passthrough over SCSI. Also, add support to camcontrol(8) for the ATA Extended Power Conditions feature set. You can now manage ATA device power states, and set various idle time thresholds for a drive to enter lower power states. Note that this change cannot be MFCed in full, because it depends on changes to the struct bio API that break compatilibity. In order to avoid breaking the stable API, only changes that don't touch or depend on the struct bio changes can be merged. For example, the camcontrol(8) changes don't depend on the new bio API, but zonectl(8) and the probe changes to the da(4) and ada(4) drivers do depend on it. Also note that the SMR changes have not yet been tested with an actual SCSI ZBC device, or a SCSI to ATA translation layer (SAT) that supports ZBC to ZAC translation. I have not yet gotten a suitable drive or SAT layer, so any testing help would be appreciated. These changes have been tested with Seagate Host Aware SATA drives attached to both SAS and SATA controllers. Also, I do not have any SATA Host Managed devices, and I suspect that it may take additional (hopefully minor) changes to support them. Thanks to Seagate for supplying the test hardware and answering questions. sbin/camcontrol/Makefile: Add epc.c and zone.c. sbin/camcontrol/camcontrol.8: Document the zone and epc subcommands. sbin/camcontrol/camcontrol.c: Add the zone and epc subcommands. Add auxiliary register support to build_ata_cmd(). Make sure to set the CAM_ATAIO_NEEDRESULT, CAM_ATAIO_DMA, and CAM_ATAIO_FPDMA flags as appropriate for ATA commands. Add a new get_ata_status() function to parse ATA result from SCSI sense descriptors (for ATA passthrough over SCSI) and ATA I/O requests. sbin/camcontrol/camcontrol.h: Update the build_ata_cmd() prototype Add get_ata_status(), zone(), and epc(). sbin/camcontrol/epc.c: Support for ATA Extended Power Conditions features. This includes support for all features documented in the ACS-4 Revision 12 specification from t13.org (dated February 18, 2016). The EPC feature set allows putting a drive into a power power mode immediately, or setting timeouts so that the drive will automatically enter progressively lower power states after various idle times. sbin/camcontrol/fwdownload.c: Update the firmware download code for the new build_ata_cmd() arguments. sbin/camcontrol/zone.c: Implement support for Shingled Magnetic Recording (SMR) drives via SCSI Zoned Block Commands (ZBC) and ATA Zoned Device ATA Command Set (ZAC). These specs were developed in concert, and are functionally identical. The primary differences are due to SCSI and ATA differences. (SCSI is big endian, ATA is little endian, for example.) This includes support for all commands defined in the ZBC and ZAC specs. sys/cam/ata/ata_all.c: Decode a number of additional ATA command names in ata_op_string(). Add a new CCB building function, ata_read_log(). Add ata_zac_mgmt_in() and ata_zac_mgmt_out() CCB building functions. These support both DMA and NCQ encapsulation. sys/cam/ata/ata_all.h: Add prototypes for ata_read_log(), ata_zac_mgmt_out(), and ata_zac_mgmt_in(). sys/cam/ata/ata_da.c: Revamp the ada(4) driver to support zoned devices. Add four new probe states to gather information needed for zone support. Add a new adasetflags() function to avoid duplication of large blocks of flag setting between the async handler and register functions. Add new sysctl variables that describe zone support and paramters. Add support for the new BIO_ZONE bio, and all of its subcommands: DISK_ZONE_OPEN, DISK_ZONE_CLOSE, DISK_ZONE_FINISH, DISK_ZONE_RWP, DISK_ZONE_REPORT_ZONES, and DISK_ZONE_GET_PARAMS. sys/cam/scsi/scsi_all.c: Add command descriptions for the ZBC IN/OUT commands. Add descriptions for ZBC Host Managed devices. Add a new function, scsi_ata_pass() to do ATA passthrough over SCSI. This will eventually replace scsi_ata_pass_16() -- it can create the 12, 16, and 32-byte variants of the ATA PASS-THROUGH command, and supports setting all of the registers defined as of SAT-4, Revision 5 (March 11, 2016). Change scsi_ata_identify() to use scsi_ata_pass() instead of scsi_ata_pass_16(). Add a new scsi_ata_read_log() function to facilitate reading ATA logs via SCSI. sys/cam/scsi/scsi_all.h: Add the new ATA PASS-THROUGH(32) command CDB. Add extended and variable CDB opcodes. Add Zoned Block Device Characteristics VPD page. Add ATA Return SCSI sense descriptor. Add prototypes for scsi_ata_read_log() and scsi_ata_pass(). sys/cam/scsi/scsi_da.c: Revamp the da(4) driver to support zoned devices. Add five new probe states, four of which are needed for ATA devices. Add five new sysctl variables that describe zone support and parameters. The da(4) driver supports SCSI ZBC devices, as well as ATA ZAC devices when they are attached via a SCSI to ATA Translation (SAT) layer. Since ZBC -> ZAC translation is a new feature in the T10 SAT-4 spec, most SATA drives will be supported via ATA commands sent via the SCSI ATA PASS-THROUGH command. The da(4) driver will prefer the ZBC interface, if it is available, for performance reasons, but will use the ATA PASS-THROUGH interface to the ZAC command set if the SAT layer doesn't support translation yet. As I mentioned above, ZBC command support is untested. Add support for the new BIO_ZONE bio, and all of its subcommands: DISK_ZONE_OPEN, DISK_ZONE_CLOSE, DISK_ZONE_FINISH, DISK_ZONE_RWP, DISK_ZONE_REPORT_ZONES, and DISK_ZONE_GET_PARAMS. Add scsi_zbc_in() and scsi_zbc_out() CCB building functions. Add scsi_ata_zac_mgmt_out() and scsi_ata_zac_mgmt_in() CCB/CDB building functions. Note that these have return values, unlike almost all other CCB building functions in CAM. The reason is that they can fail, depending upon the particular combination of input parameters. The primary failure case is if the user wants NCQ, but fails to specify additional CDB storage. NCQ requires using the 32-byte version of the SCSI ATA PASS-THROUGH command, and the current CAM CDB size is 16 bytes. sys/cam/scsi/scsi_da.h: Add ZBC IN and ZBC OUT CDBs and opcodes. Add SCSI Report Zones data structures. Add scsi_zbc_in(), scsi_zbc_out(), scsi_ata_zac_mgmt_out(), and scsi_ata_zac_mgmt_in() prototypes. sys/dev/ahci/ahci.c: Fix SEND / RECEIVE FPDMA QUEUED in the ahci(4) driver. ahci_setup_fis() previously set the top bits of the sector count register in the FIS to 0 for FPDMA commands. This is okay for read and write, because the PRIO field is in the only thing in those bits, and we don't implement that further up the stack. But, for SEND and RECEIVE FPDMA QUEUED, the subcommand is in that byte, so it needs to be transmitted to the drive. In ahci_setup_fis(), always set the the top 8 bits of the sector count register. We need it in both the standard and NCQ / FPDMA cases. sys/geom/eli/g_eli.c: Pass BIO_ZONE commands through the GELI class. sys/geom/geom.h: Add g_io_zonecmd() prototype. sys/geom/geom_dev.c: Add new DIOCZONECMD ioctl, which allows sending zone commands to disks. sys/geom/geom_disk.c: Add support for BIO_ZONE commands. sys/geom/geom_disk.h: Add a new flag, DISKFLAG_CANZONE, that indicates that a given GEOM disk client can handle BIO_ZONE commands. sys/geom/geom_io.c: Add a new function, g_io_zonecmd(), that handles execution of BIO_ZONE commands. Add permissions check for BIO_ZONE commands. Add command decoding for BIO_ZONE commands. sys/geom/geom_subr.c: Add DDB command decoding for BIO_ZONE commands. sys/kern/subr_devstat.c: Record statistics for REPORT ZONES commands. Note that the number of bytes transferred for REPORT ZONES won't quite match what is received from the harware. This is because we're necessarily counting bytes coming from the da(4) / ada(4) drivers, which are using the disk_zone.h interface to communicate up the stack. The structure sizes it uses are slightly different than the SCSI and ATA structure sizes. sys/sys/ata.h: Add many bit and structure definitions for ZAC, NCQ, and EPC command support. sys/sys/bio.h: Convert the bio_cmd field to a straight enumeration. This will yield more space for additional commands in the future. After change r297955 and other related changes, this is now possible. Converting to an enumeration will also prevent use as a bitmask in the future. sys/sys/disk.h: Define the DIOCZONECMD ioctl. sys/sys/disk_zone.h: Add a new API for managing zoned disks. This is very close to the SCSI ZBC and ATA ZAC standards, but uses integers in native byte order instead of big endian (SCSI) or little endian (ATA) byte arrays. This is intended to offer to the complete feature set of the ZBC and ZAC disk management without requiring the application developer to include SCSI or ATA headers. We also use one set of headers for ioctl consumers and kernel bio-level consumers. sys/sys/param.h: Bump __FreeBSD_version for sys/bio.h command changes, and inclusion of SMR support. usr.sbin/Makefile: Add the zonectl utility. usr.sbin/diskinfo/diskinfo.c Add disk zoning capability to the 'diskinfo -v' output. usr.sbin/zonectl/Makefile: Add zonectl makefile. usr.sbin/zonectl/zonectl.8 zonectl(8) man page. usr.sbin/zonectl/zonectl.c The zonectl(8) utility. This allows managing SCSI or ATA zoned disks via the disk_zone.h API. You can report zones, reset write pointers, get parameters, etc. Sponsored by: Spectra Logic Differential Revision: https://reviews.freebsd.org/D6147 Reviewed by: wblock (documentation) Notes: svn path=/head/; revision=300207
* Bump bio_cmd and bio_*flags from 8 bits to 16.Warner Losh2016-04-141-4/+4
| | | | | | | Differential Revision: https://reviews.freebsd.org/D5784 Notes: svn path=/head/; revision=297955
* Add asynchronous command support to the pass(4) driver, and the newKenneth D. Merry2015-12-031-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | camdd(8) utility. CCBs may be queued to the driver via the new CAMIOQUEUE ioctl, and completed CCBs may be retrieved via the CAMIOGET ioctl. User processes can use poll(2) or kevent(2) to get notification when I/O has completed. While the existing CAMIOCOMMAND blocking ioctl interface only supports user virtual data pointers in a CCB (generally only one per CCB), the new CAMIOQUEUE ioctl supports user virtual and physical address pointers, as well as user virtual and physical scatter/gather lists. This allows user applications to have more flexibility in their data handling operations. Kernel memory for data transferred via the queued interface is allocated from the zone allocator in MAXPHYS sized chunks, and user data is copied in and out. This is likely faster than the vmapbuf()/vunmapbuf() method used by the CAMIOCOMMAND ioctl in configurations with many processors (there are more TLB shootdowns caused by the mapping/unmapping operation) but may not be as fast as running with unmapped I/O. The new memory handling model for user requests also allows applications to send CCBs with request sizes that are larger than MAXPHYS. The pass(4) driver now limits queued requests to the I/O size listed by the SIM driver in the maxio field in the Path Inquiry (XPT_PATH_INQ) CCB. There are some things things would be good to add: 1. Come up with a way to do unmapped I/O on multiple buffers. Currently the unmapped I/O interface operates on a struct bio, which includes only one address and length. It would be nice to be able to send an unmapped scatter/gather list down to busdma. This would allow eliminating the copy we currently do for data. 2. Add an ioctl to list currently outstanding CCBs in the various queues. 3. Add an ioctl to cancel a request, or use the XPT_ABORT CCB to do that. 4. Test physical address support. Virtual pointers and scatter gather lists have been tested, but I have not yet tested physical addresses or scatter/gather lists. 5. Investigate multiple queue support. At the moment there is one queue of commands per pass(4) device. If multiple processes open the device, they will submit I/O into the same queue and get events for the same completions. This is probably the right model for most applications, but it is something that could be changed later on. Also, add a new utility, camdd(8) that uses the asynchronous pass(4) driver interface. This utility is intended to be a basic data transfer/copy utility, a simple benchmark utility, and an example of how to use the asynchronous pass(4) interface. It can copy data to and from pass(4) devices using any target queue depth, starting offset and blocksize for the input and ouptut devices. It currently only supports SCSI devices, but could be easily extended to support ATA devices. It can also copy data to and from regular files, block devices, tape devices, pipes, stdin, and stdout. It does not support queueing multiple commands to any of those targets, since it uses the standard read(2)/write(2)/writev(2)/readv(2) system calls. The I/O is done by two threads, one for the reader and one for the writer. The reader thread sends completed read requests to the writer thread in strictly sequential order, even if they complete out of order. That could be modified later on for random I/O patterns or slightly out of order I/O. camdd(8) uses kqueue(2)/kevent(2) to get I/O completion events from the pass(4) driver and also to send request notifications internally. For pass(4) devcies, camdd(8) uses a single buffer (CAM_DATA_VADDR) per CAM CCB on the reading side, and a scatter/gather list (CAM_DATA_SG) on the writing side. In addition to testing both interfaces, this makes any potential reblocking of I/O easier. No data is copied between the reader and the writer, but rather the reader's buffers are split into multiple I/O requests or combined into a single I/O request depending on the input and output blocksize. For the file I/O path, camdd(8) also uses a single buffer (read(2), write(2), pread(2) or pwrite(2)) on reads, and a scatter/gather list (readv(2), writev(2), preadv(2), pwritev(2)) on writes. Things that would be nice to do for camdd(8) eventually: 1. Add support for I/O pattern generation. Patterns like all zeros, all ones, LBA-based patterns, random patterns, etc. Right Now you can always use /dev/zero, /dev/random, etc. 2. Add support for a "sink" mode, so we do only reads with no writes. Right now, you can use /dev/null. 3. Add support for automatic queue depth probing, so that we can figure out the right queue depth on the input and output side for maximum throughput. At the moment it defaults to 6. 4. Add support for SATA device passthrough I/O. 5. Add support for random LBAs and/or lengths on the input and output sides. 6. Track average per-I/O latency and busy time. The busy time and latency could also feed in to the automatic queue depth determination. sys/cam/scsi/scsi_pass.h: Define two new ioctls, CAMIOQUEUE and CAMIOGET, that queue and fetch asynchronous CAM CCBs respectively. Although these ioctls do not have a declared argument, they both take a union ccb pointer. If we declare a size here, the ioctl code in sys/kern/sys_generic.c will malloc and free a buffer for either the CCB or the CCB pointer (depending on how it is declared). Since we have to keep a copy of the CCB (which is fairly large) anyway, having the ioctl malloc and free a CCB for each call is wasteful. sys/cam/scsi/scsi_pass.c: Add asynchronous CCB support. Add two new ioctls, CAMIOQUEUE and CAMIOGET. CAMIOQUEUE adds a CCB to the incoming queue. The CCB is executed immediately (and moved to the active queue) if it is an immediate CCB, but otherwise it will be executed in passstart() when a CCB is available from the transport layer. When CCBs are completed (because they are immediate or passdone() if they are queued), they are put on the done queue. If we get the final close on the device before all pending I/O is complete, all active I/O is moved to the abandoned queue and we increment the peripheral reference count so that the peripheral driver instance doesn't go away before all pending I/O is done. The new passcreatezone() function is called on the first call to the CAMIOQUEUE ioctl on a given device to allocate the UMA zones for I/O requests and S/G list buffers. This may be good to move off to a taskqueue at some point. The new passmemsetup() function allocates memory and scatter/gather lists to hold the user's data, and copies in any data that needs to be written. For virtual pointers (CAM_DATA_VADDR), the kernel buffer is malloced from the new pass(4) driver malloc bucket. For virtual scatter/gather lists (CAM_DATA_SG), buffers are allocated from a new per-pass(9) UMA zone in MAXPHYS-sized chunks. Physical pointers are passed in unchanged. We have support for up to 16 scatter/gather segments (for the user and kernel S/G lists) in the default struct pass_io_req, so requests with longer S/G lists require an extra kernel malloc. The new passcopysglist() function copies a user scatter/gather list to a kernel scatter/gather list. The number of elements in each list may be different, but (obviously) the amount of data stored has to be identical. The new passmemdone() function copies data out for the CAM_DATA_VADDR and CAM_DATA_SG cases. The new passiocleanup() function restores data pointers in user CCBs and frees memory. Add new functions to support kqueue(2)/kevent(2): passreadfilt() tells kevent whether or not the done queue is empty. passkqfilter() adds a knote to our list. passreadfiltdetach() removes a knote from our list. Add a new function, passpoll(), for poll(2)/select(2) to use. Add devstat(9) support for the queued CCB path. sys/cam/ata/ata_da.c: Add support for the BIO_VLIST bio type. sys/cam/cam_ccb.h: Add a new enumeration for the xflags field in the CCB header. (This doesn't change the CCB header, just adds an enumeration to use.) sys/cam/cam_xpt.c: Add a new function, xpt_setup_ccb_flags(), that allows specifying CCB flags. sys/cam/cam_xpt.h: Add a prototype for xpt_setup_ccb_flags(). sys/cam/scsi/scsi_da.c: Add support for BIO_VLIST. sys/dev/md/md.c: Add BIO_VLIST support to md(4). sys/geom/geom_disk.c: Add BIO_VLIST support to the GEOM disk class. Re-factor the I/O size limiting code in g_disk_start() a bit. sys/kern/subr_bus_dma.c: Change _bus_dmamap_load_vlist() to take a starting offset and length. Add a new function, _bus_dmamap_load_pages(), that will load a list of physical pages starting at an offset. Update _bus_dmamap_load_bio() to allow loading BIO_VLIST bios. Allow unmapped I/O to start at an offset. sys/kern/subr_uio.c: Add two new functions, physcopyin_vlist() and physcopyout_vlist(). sys/pc98/include/bus.h: Guard kernel-only parts of the pc98 machine/bus.h header with #ifdef _KERNEL. This allows userland programs to include <machine/bus.h> to get the definition of bus_addr_t and bus_size_t. sys/sys/bio.h: Add a new bio flag, BIO_VLIST. sys/sys/uio.h: Add prototypes for physcopyin_vlist() and physcopyout_vlist(). share/man/man4/pass.4: Document the CAMIOQUEUE and CAMIOGET ioctls. usr.sbin/Makefile: Add camdd. usr.sbin/camdd/Makefile: Add a makefile for camdd(8). usr.sbin/camdd/camdd.8: Man page for camdd(8). usr.sbin/camdd/camdd.c: The new camdd(8) utility. Sponsored by: Spectra Logic MFC after: 1 week Notes: svn path=/head/; revision=291716
* Be more explicit about what each bio_cmd & bio_flags value means.Will Andrews2013-03-231-8/+12
| | | | | | | Reviewed by: ken (mentor) Notes: svn path=/head/; revision=248654
* Implement the concept of the unmapped VMIO buffers, i.e. buffers whichKonstantin Belousov2013-03-191-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | do not map the b_pages pages into buffer_map KVA. The use of the unmapped buffers eliminate the need to perform TLB shootdown for mapping on the buffer creation and reuse, greatly reducing the amount of IPIs for shootdown on big-SMP machines and eliminating up to 25-30% of the system time on i/o intensive workloads. The unmapped buffer should be explicitely requested by the GB_UNMAPPED flag by the consumer. For unmapped buffer, no KVA reservation is performed at all. The consumer might request unmapped buffer which does have a KVA reserve, to manually map it without recursing into buffer cache and blocking, with the GB_KVAALLOC flag. When the mapped buffer is requested and unmapped buffer already exists, the cache performs an upgrade, possibly reusing the KVA reservation. Unmapped buffer is translated into unmapped bio in g_vfs_strategy(). Unmapped bio carry a pointer to the vm_page_t array, offset and length instead of the data pointer. The provider which processes the bio should explicitely specify a readiness to accept unmapped bio, otherwise g_down geom thread performs the transient upgrade of the bio request by mapping the pages into the new bio_transient_map KVA submap. The bio_transient_map submap claims up to 10% of the buffer map, and the total buffer_map + bio_transient_map KVA usage stays the same. Still, it could be manually tuned by kern.bio_transient_maxcnt tunable, in the units of the transient mappings. Eventually, the bio_transient_map could be removed after all geom classes and drivers can accept unmapped i/o requests. Unmapped support can be turned off by the vfs.unmapped_buf_allowed tunable, disabling which makes the buffer (or cluster) creation requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped buffers are only enabled by default on the architectures where pmap_copy_page() was implemented and tested. In the rework, filesystem metadata is not the subject to maxbufspace limit anymore. Since the metadata buffers are always mapped, the buffers still have to fit into the buffer map, which provides a reasonable (but practically unreachable) upper bound on it. The non-metadata buffer allocations, both mapped and unmapped, is accounted against maxbufspace, as before. Effectively, this means that the maxbufspace is forced on mapped and unmapped buffers separately. The pre-patch bufspace limiting code did not worked, because buffer_map fragmentation does not allow the limit to be reached. By Jeff Roberson request, the getnewbuf() function was split into smaller single-purpose functions. Sponsored by: The FreeBSD Foundation Discussed with: jeff (previous version) Tested by: pho, scottl (previous version), jhb, bf MFC after: 2 weeks Notes: svn path=/head/; revision=248508
* Correct bioq_disksort so that bioq_insert_tail() offers barrier semantic.Justin T. Gibbs2010-09-021-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add the BIO_ORDERED flag for struct bio and update bio clients to use it. The barrier semantics of bioq_insert_tail() were broken in two ways: o In bioq_disksort(), an added bio could be inserted at the head of the queue, even when a barrier was present, if the sort key for the new entry was less than that of the last queued barrier bio. o The last_offset used to generate the sort key for newly queued bios did not stay at the position of the barrier until either the barrier was de-queued, or a new barrier (which updates last_offset) was queued. When a barrier is in effect, we know that the disk will pass through the barrier position just before the "blocked bios" are released, so using the barrier's offset for last_offset is the optimal choice. sys/geom/sched/subr_disk.c: sys/kern/subr_disk.c: o Update last_offset in bioq_insert_tail(). o Only update last_offset in bioq_remove() if the removed bio is at the head of the queue (typically due to a call via bioq_takefirst()) and no barrier is active. o In bioq_disksort(), if we have a barrier (insert_point is non-NULL), set prev to the barrier and cur to it's next element. Now that last_offset is kept at the barrier position, this change isn't strictly necessary, but since we have to take a decision branch anyway, it does avoid one, no-op, loop iteration in the while loop that immediately follows. o In bioq_disksort(), bypass the normal sort for bios with the BIO_ORDERED attribute and instead insert them into the queue with bioq_insert_tail(). bioq_insert_tail() not only gives the desired command order during insertion, but also provides barrier semantics so that commands disksorted in the future cannot pass the just enqueued transaction. sys/sys/bio.h: Add BIO_ORDERED as bit 4 of the bio_flags field in struct bio. sys/cam/ata/ata_da.c: sys/cam/scsi/scsi_da.c Use an ordered command for SCSI/ATA-NCQ commands issued in response to bios with the BIO_ORDERED flag set. sys/cam/scsi/scsi_da.c Use an ordered tag when issuing a synchronize cache command. Wrap some lines to 80 columns. sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c sys/geom/geom_io.c Mark bios with the BIO_FLUSH command as BIO_ORDERED. Sponsored by: Spectra Logic Corporation MFC after: 1 month Notes: svn path=/head/; revision=212160
* only export bio_cmd and flags to userland (bio_cmd areLuigi Rizzo2009-12-111-17/+16
| | | | | | | | | | | | | used by ggatectl, flags are potentially useful). Other parts are internal kernel data structures and should not be visible to userland. No API change involved. MFC after: 3 days Notes: svn path=/head/; revision=200403
* As discussed in the devsummit, introduce two fields in theLuigi Rizzo2009-06-111-0/+7
| | | | | | | | | | struct bio to store classification information, and a hook for classifier functions that can be called by g_io_request(). This code is from Fabio Checconi as part of his GSOC work. Notes: svn path=/head/; revision=193981
* Add a new I/O request - BIO_FLUSH, which basically tells providers below toPawel Jakub Dawidek2006-10-311-0/+1
| | | | | | | | | | flush their caches. For now will mostly be used by disks to flush their write cache. Sponsored by: home.pl Notes: svn path=/head/; revision=163832
* Assert proper use of bio_caller1, bio_caller2, bio_cflags, bio_driver1,Pawel Jakub Dawidek2006-03-011-0/+5
| | | | | | | | | bio_driver2 and bio_pflags fields. Reviewed by: phk Notes: svn path=/head/; revision=156170
* Correct division by zero error in comment.Kris Kennaway2005-11-241-1/+1
| | | | Notes: svn path=/head/; revision=152739
* - switch_point is now unused. This doesn't break module binary compatabilityJeff Roberson2005-06-121-1/+0
| | | | | | | since the structure is shrinking, not growing. Notes: svn path=/head/; revision=147324
* /* -> /*- for license, minor formatting changesWarner Losh2005-01-071-1/+1
| | | | Notes: svn path=/head/; revision=139825
* Add bioq_insert_head() function.Pawel Jakub Dawidek2004-12-131-0/+1
| | | | | | | OK'd by: phk Notes: svn path=/head/; revision=138800
* Add more KASSERTS and checks.Poul-Henning Kamp2004-08-301-0/+1
| | | | Notes: svn path=/head/; revision=134519
* Add bioq_takefirst().Poul-Henning Kamp2004-08-191-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | If the bioq is empty, NULL is returned. Otherwise the front element is removed and returned. This can simplify locking in many drivers from: lock() bp = bioq_first(bq); if (bp == NULL) { unlock() return } bioq_remove(bp, bq) unlock to: lock() bp = bioq_takefirst(bq); unlock() if (bp == NULL) return; Notes: svn path=/head/; revision=134038
* - Add two fields to bio structure: 'bio_cflags' which can be used byPawel Jakub Dawidek2004-08-041-16/+16
| | | | | | | | | | | | | | | consumer and 'bio_pflags' which can be used by provider. - Remove BIO_FLAG1 and BIO_FLAG2 flags. From now on new fields should be used for internal flags. - Update g_bio(9) manual page. - Update some comments. - Update GEOM_MIRROR, which was the only one using BIO_FLAGs. Idea from: phk Reviewed by: phk Notes: svn path=/head/; revision=133142
* Do the dreaded s/dev_t/struct cdev */Poul-Henning Kamp2004-06-161-2/+2
| | | | | | | Bump __FreeBSD_version accordingly. Notes: svn path=/head/; revision=130585
* Remove advertising clause from University of California Regent's license,Warner Losh2004-04-071-4/+0
| | | | | | | | | per letter dated July 22, 1999. Approved by: core Notes: svn path=/head/; revision=127976
* Bring back the geom_bioqueues, they _are_ a good idea.Poul-Henning Kamp2004-01-281-1/+3
| | | | | | | ATA will uses these RSN. Notes: svn path=/head/; revision=125137
* Retire bio_blkno entirely.Poul-Henning Kamp2003-10-181-1/+0
| | | | | | | | | bio_offset is the field drivers should use. bio_pblkno remains as a convenient place to store the number of the device drivers. Notes: svn path=/head/; revision=121216
* Make bioq_disksort() sort on the bio_offset field instead of bio_pblkno.Poul-Henning Kamp2003-10-181-1/+1
| | | | Notes: svn path=/head/; revision=121207
* Retire the experimental bio_taskqueue(), it was not quite as usable asPoul-Henning Kamp2003-04-121-2/+0
| | | | | | | | hoped. It can be revived from here, should other drivers be able to use it. Notes: svn path=/head/; revision=113392
* Remove BIO_SETATTR from non-GEOM part of kernel as well.Poul-Henning Kamp2003-04-031-1/+0
| | | | Notes: svn path=/head/; revision=113033
* Remove the #define for bioqdisksort(), it's no longer needed.Poul-Henning Kamp2003-04-011-1/+0
| | | | Notes: svn path=/head/; revision=112951
* Introduce bioq_flush() function.Poul-Henning Kamp2003-04-011-0/+1
| | | | Notes: svn path=/head/; revision=112941
* retire the "busy" field in bioqueues, it's served it's purpose.Poul-Henning Kamp2003-03-301-1/+0
| | | | Notes: svn path=/head/; revision=112848
* Preparation commit before I start on the bioqueue lockdown:Poul-Henning Kamp2003-03-301-18/+3
| | | | | | | | Collect all the bits of bioqueue handing in subr_disk.c, vfs_bio.c is big enough as it is and disksort already lives in subr_disk.c. Notes: svn path=/head/; revision=112846
* Implement a bio-taskqueue to reduce number of context switches inPoul-Henning Kamp2003-02-111-0/+9
| | | | | | | | | | | | | | | | | | | | | | | disk I/O processing. The intent is that the disk driver in its hardware interrupt routine will simply schedule the bio on the task queue with a routine to finish off whatever needs done. The g_up thread will then schedule this routine, the likely outcome of which is a biodone() which queues the bio on g_up's regular queue where it will be picked up and processed. Compared to the using the regular taskqueue, this saves one contextswitch. Change our scheduling of the g_up and g_down queues to be water-tight, at the cost of breaking the userland regression test-shims. Input and ideas from: scottl Notes: svn path=/head/; revision=110736
* Commit the correct copy of the g_stat structure.Poul-Henning Kamp2003-02-071-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add debug.sizeof.g_stat sysctl. Set the id field of the g_stat when we create consumers and providers. Remove biocount from consumer, we will use the counters in the g_stat structure instead. Replace one field which will need to be atomically manipulated with two fields which will not (stat.nop and stat.nend). Change add companion field to bio_children: bio_inbed for the exact same reason. Don't output the biocount in the confdot output. Fix KASSERT in g_io_request(). Add sysctl kern.geom.collectstats defaulting to off. Collect the following raw statistics conditioned on this sysctl: for each consumer and provider { total number of operations started. total number of operations completed. time last operation completed. sum of idle-time. for each of BIO_READ, BIO_WRITE and BIO_DELETE { number of operations completed. number of bytes completed. number of ENOMEM errors. number of other errors. sum of transaction time. } } API for getting hold of these statistics data not included yet. Notes: svn path=/head/; revision=110523
* Rename bio_linkage to the more obvious bio_parent.Poul-Henning Kamp2003-02-071-1/+2
| | | | | | | Add bio_t0 timestamp, and include <sys/time.h> where needed Notes: svn path=/head/; revision=110517
* Add a bio_disk pointer for use between geom_disk and the device drivers.Poul-Henning Kamp2003-02-021-0/+2
| | | | Notes: svn path=/head/; revision=110230
* NO_GEOM cleanup: Rip out iodone_chain with a big smile on my face.Poul-Henning Kamp2003-01-301-13/+0
| | | | Notes: svn path=/head/; revision=110101
* Add a field for tallying the number of spawned bio's a bio has.Poul-Henning Kamp2002-10-091-5/+6
| | | | | | | | | Rearrange and comment some GEOM related fields. Sponsored by: DARPA & NAI Labs. Notes: svn path=/head/; revision=104700
* Make FreeBSD "struct disklabel" agnostic, step 312 of 723:Poul-Henning Kamp2002-09-201-0/+2
| | | | | | | | | | | | | Rename bioqdisksort() to bioq_disksort(). Keep a #define around to avoid changing all diskdrivers right now. Move it from subr_disklabel.c to subr_disk.c. Move prototype from <sys/disklabel.h> to <sys/bio.h> Sponsored by: DARPA and NAI Labs. Notes: svn path=/head/; revision=103683
* Remove the unused _bio_buf field. I can't even remember if this ever gotPoul-Henning Kamp2002-09-151-1/+0
| | | | | | | | | to be used in the first place. Spotted by: bde Notes: svn path=/head/; revision=103342
* Un-inline the non-trivial "trivial" bio* functions.Poul-Henning Kamp2002-09-141-55/+6
| | | | | | | Untangle devstat_end_transaction_bio() Notes: svn path=/head/; revision=103330
* Oops, broke the build there. Uninline biodone() now that it is non-trivial.Poul-Henning Kamp2002-09-131-9/+2
| | | | | | | | | | | | Introduce biowait() function. Currently there is a race condition and the mitigation is a timeout/retry. It is not obvious what kind of locking (if any) is suitable for BIO_DONE, since the majority of users take are of this themselves, and only a few places actually rely on the wakeup. Sponsored by: DARPA & NAI Labs. Notes: svn path=/head/; revision=103281
* Make biodone() default to wakeup() on the struct bio if no bio_donePoul-Henning Kamp2002-09-131-1/+4
| | | | | | | method was specified. Notes: svn path=/head/; revision=103280
* Forward declare struct uio so that <sys/uio.h> isn't a prerequisite.Bruce Evans2002-09-051-3/+2
| | | | | | | Removed bogus forward declarations of structs. Notes: svn path=/head/; revision=102956
* Make daddr_t and u_daddr_t 64bits wide.Poul-Henning Kamp2002-05-141-3/+3
| | | | | | | | | Retire daddr64_t and use daddr_t instead. Sponsored by: DARPA & NAI Labs. Notes: svn path=/head/; revision=96572
* Constifixion of bio_attribute.Poul-Henning Kamp2002-04-091-1/+1
| | | | Notes: svn path=/head/; revision=94281