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Revert "pktcdvd: remove driver."
This reverts commit f40eb99897.
There are apparently still users out there of this driver. While we'd
love to remove it to ease the maintenance burden, let's reinstate it
for now until better (userspace) solutions can be developed.
Link: https://lore.kernel.org/lkml/20230104190115.ceglfefco475ev6c@pali/
Reported-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
parent
050a4f341f
commit
4b83e99ee7
18
Documentation/ABI/testing/debugfs-pktcdvd
Normal file
18
Documentation/ABI/testing/debugfs-pktcdvd
Normal file
@ -0,0 +1,18 @@
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What: /sys/kernel/debug/pktcdvd/pktcdvd[0-7]
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Date: Oct. 2006
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KernelVersion: 2.6.20
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Contact: Thomas Maier <balagi@justmail.de>
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Description:
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The pktcdvd module (packet writing driver) creates
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these files in debugfs:
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/sys/kernel/debug/pktcdvd/pktcdvd[0-7]/
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==== ====== ====================================
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info 0444 Lots of driver statistics and infos.
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==== ====== ====================================
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Example::
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cat /sys/kernel/debug/pktcdvd/pktcdvd0/info
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97
Documentation/ABI/testing/sysfs-class-pktcdvd
Normal file
97
Documentation/ABI/testing/sysfs-class-pktcdvd
Normal file
@ -0,0 +1,97 @@
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sysfs interface
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---------------
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The pktcdvd module (packet writing driver) creates the following files in the
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sysfs: (<devid> is in the format major:minor)
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What: /sys/class/pktcdvd/add
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What: /sys/class/pktcdvd/remove
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What: /sys/class/pktcdvd/device_map
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Date: Oct. 2006
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KernelVersion: 2.6.20
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Contact: Thomas Maier <balagi@justmail.de>
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Description:
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========== ==============================================
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add (WO) Write a block device id (major:minor) to
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create a new pktcdvd device and map it to the
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block device.
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remove (WO) Write the pktcdvd device id (major:minor)
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to remove the pktcdvd device.
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device_map (RO) Shows the device mapping in format:
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pktcdvd[0-7] <pktdevid> <blkdevid>
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========== ==============================================
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What: /sys/class/pktcdvd/pktcdvd[0-7]/dev
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What: /sys/class/pktcdvd/pktcdvd[0-7]/uevent
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Date: Oct. 2006
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KernelVersion: 2.6.20
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Contact: Thomas Maier <balagi@justmail.de>
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Description:
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dev: (RO) Device id
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uevent: (WO) To send a uevent
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What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_started
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What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_finished
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What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_written
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What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read
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What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read_gather
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What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/reset
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Date: Oct. 2006
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KernelVersion: 2.6.20
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Contact: Thomas Maier <balagi@justmail.de>
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Description:
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packets_started: (RO) Number of started packets.
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packets_finished: (RO) Number of finished packets.
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kb_written: (RO) kBytes written.
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kb_read: (RO) kBytes read.
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kb_read_gather: (RO) kBytes read to fill write packets.
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reset: (WO) Write any value to it to reset
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pktcdvd device statistic values, like
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bytes read/written.
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What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/size
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What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_off
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What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_on
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Date: Oct. 2006
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KernelVersion: 2.6.20
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Contact: Thomas Maier <balagi@justmail.de>
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Description:
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============== ================================================
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size (RO) Contains the size of the bio write queue.
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congestion_off (RW) If bio write queue size is below this mark,
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accept new bio requests from the block layer.
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congestion_on (RW) If bio write queue size is higher as this
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mark, do no longer accept bio write requests
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from the block layer and wait till the pktcdvd
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device has processed enough bio's so that bio
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write queue size is below congestion off mark.
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A value of <= 0 disables congestion control.
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============== ================================================
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Example:
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--------
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To use the pktcdvd sysfs interface directly, you can do::
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# create a new pktcdvd device mapped to /dev/hdc
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echo "22:0" >/sys/class/pktcdvd/add
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cat /sys/class/pktcdvd/device_map
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# assuming device pktcdvd0 was created, look at stat's
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cat /sys/class/pktcdvd/pktcdvd0/stat/kb_written
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# print the device id of the mapped block device
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fgrep pktcdvd0 /sys/class/pktcdvd/device_map
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# remove device, using pktcdvd0 device id 253:0
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echo "253:0" >/sys/class/pktcdvd/remove
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@ -16520,6 +16520,13 @@ S: Supported
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F: Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml
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F: drivers/input/keyboard/pinephone-keyboard.c
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PKTCDVD DRIVER
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M: linux-block@vger.kernel.org
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S: Orphan
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F: drivers/block/pktcdvd.c
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F: include/linux/pktcdvd.h
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F: include/uapi/linux/pktcdvd.h
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PLANTOWER PMS7003 AIR POLLUTION SENSOR DRIVER
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M: Tomasz Duszynski <tduszyns@gmail.com>
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S: Maintained
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@ -285,6 +285,49 @@ config BLK_DEV_RAM_SIZE
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The default value is 4096 kilobytes. Only change this if you know
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what you are doing.
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config CDROM_PKTCDVD
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tristate "Packet writing on CD/DVD media (DEPRECATED)"
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depends on !UML
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depends on SCSI
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select CDROM
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help
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Note: This driver is deprecated and will be removed from the
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kernel in the near future!
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If you have a CDROM/DVD drive that supports packet writing, say
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Y to include support. It should work with any MMC/Mt Fuji
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compliant ATAPI or SCSI drive, which is just about any newer
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DVD/CD writer.
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Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
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is possible.
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DVD-RW disks must be in restricted overwrite mode.
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See the file <file:Documentation/cdrom/packet-writing.rst>
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for further information on the use of this driver.
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To compile this driver as a module, choose M here: the
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module will be called pktcdvd.
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config CDROM_PKTCDVD_BUFFERS
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int "Free buffers for data gathering"
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depends on CDROM_PKTCDVD
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default "8"
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help
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This controls the maximum number of active concurrent packets. More
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concurrent packets can increase write performance, but also require
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more memory. Each concurrent packet will require approximately 64Kb
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of non-swappable kernel memory, memory which will be allocated when
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a disc is opened for writing.
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config CDROM_PKTCDVD_WCACHE
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bool "Enable write caching"
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depends on CDROM_PKTCDVD
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help
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If enabled, write caching will be set for the CD-R/W device. For now
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this option is dangerous unless the CD-RW media is known good, as we
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don't do deferred write error handling yet.
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config ATA_OVER_ETH
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tristate "ATA over Ethernet support"
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depends on NET
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@ -20,6 +20,7 @@ obj-$(CONFIG_AMIGA_Z2RAM) += z2ram.o
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obj-$(CONFIG_N64CART) += n64cart.o
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obj-$(CONFIG_BLK_DEV_RAM) += brd.o
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obj-$(CONFIG_BLK_DEV_LOOP) += loop.o
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obj-$(CONFIG_CDROM_PKTCDVD) += pktcdvd.o
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obj-$(CONFIG_SUNVDC) += sunvdc.o
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obj-$(CONFIG_BLK_DEV_NBD) += nbd.o
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2944
drivers/block/pktcdvd.c
Normal file
2944
drivers/block/pktcdvd.c
Normal file
File diff suppressed because it is too large
Load Diff
197
include/linux/pktcdvd.h
Normal file
197
include/linux/pktcdvd.h
Normal file
@ -0,0 +1,197 @@
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/*
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* Copyright (C) 2000 Jens Axboe <axboe@suse.de>
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* Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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* Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
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* DVD-RW devices.
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*
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*/
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#ifndef __PKTCDVD_H
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#define __PKTCDVD_H
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#include <linux/blkdev.h>
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#include <linux/completion.h>
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#include <linux/cdrom.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <linux/mempool.h>
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#include <uapi/linux/pktcdvd.h>
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/* default bio write queue congestion marks */
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#define PKT_WRITE_CONGESTION_ON 10000
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#define PKT_WRITE_CONGESTION_OFF 9000
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struct packet_settings
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{
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__u32 size; /* packet size in (512 byte) sectors */
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__u8 fp; /* fixed packets */
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__u8 link_loss; /* the rest is specified
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* as per Mt Fuji */
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__u8 write_type;
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__u8 track_mode;
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__u8 block_mode;
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};
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/*
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* Very crude stats for now
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*/
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struct packet_stats
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{
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unsigned long pkt_started;
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unsigned long pkt_ended;
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unsigned long secs_w;
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unsigned long secs_rg;
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unsigned long secs_r;
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};
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struct packet_cdrw
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{
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struct list_head pkt_free_list;
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struct list_head pkt_active_list;
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spinlock_t active_list_lock; /* Serialize access to pkt_active_list */
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struct task_struct *thread;
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atomic_t pending_bios;
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};
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/*
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* Switch to high speed reading after reading this many kilobytes
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* with no interspersed writes.
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*/
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#define HI_SPEED_SWITCH 512
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struct packet_iosched
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{
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atomic_t attention; /* Set to non-zero when queue processing is needed */
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int writing; /* Non-zero when writing, zero when reading */
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spinlock_t lock; /* Protecting read/write queue manipulations */
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struct bio_list read_queue;
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struct bio_list write_queue;
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sector_t last_write; /* The sector where the last write ended */
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int successive_reads;
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};
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/*
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* 32 buffers of 2048 bytes
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*/
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#if (PAGE_SIZE % CD_FRAMESIZE) != 0
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#error "PAGE_SIZE must be a multiple of CD_FRAMESIZE"
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#endif
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#define PACKET_MAX_SIZE 128
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#define FRAMES_PER_PAGE (PAGE_SIZE / CD_FRAMESIZE)
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#define PACKET_MAX_SECTORS (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)
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enum packet_data_state {
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PACKET_IDLE_STATE, /* Not used at the moment */
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PACKET_WAITING_STATE, /* Waiting for more bios to arrive, so */
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/* we don't have to do as much */
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/* data gathering */
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PACKET_READ_WAIT_STATE, /* Waiting for reads to fill in holes */
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PACKET_WRITE_WAIT_STATE, /* Waiting for the write to complete */
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PACKET_RECOVERY_STATE, /* Recover after read/write errors */
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PACKET_FINISHED_STATE, /* After write has finished */
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PACKET_NUM_STATES /* Number of possible states */
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};
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/*
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* Information needed for writing a single packet
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*/
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struct pktcdvd_device;
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struct packet_data
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{
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struct list_head list;
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spinlock_t lock; /* Lock protecting state transitions and */
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/* orig_bios list */
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struct bio_list orig_bios; /* Original bios passed to pkt_make_request */
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/* that will be handled by this packet */
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int write_size; /* Total size of all bios in the orig_bios */
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/* list, measured in number of frames */
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struct bio *w_bio; /* The bio we will send to the real CD */
|
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/* device once we have all data for the */
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/* packet we are going to write */
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sector_t sector; /* First sector in this packet */
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int frames; /* Number of frames in this packet */
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enum packet_data_state state; /* Current state */
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atomic_t run_sm; /* Incremented whenever the state */
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/* machine needs to be run */
|
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long sleep_time; /* Set this to non-zero to make the state */
|
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/* machine run after this many jiffies. */
|
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|
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atomic_t io_wait; /* Number of pending IO operations */
|
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atomic_t io_errors; /* Number of read/write errors during IO */
|
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|
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struct bio *r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */
|
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struct page *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE];
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|
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int cache_valid; /* If non-zero, the data for the zone defined */
|
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/* by the sector variable is completely cached */
|
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/* in the pages[] vector. */
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|
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int id; /* ID number for debugging */
|
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struct pktcdvd_device *pd;
|
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};
|
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|
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struct pkt_rb_node {
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struct rb_node rb_node;
|
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struct bio *bio;
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};
|
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|
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struct packet_stacked_data
|
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{
|
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struct bio *bio; /* Original read request bio */
|
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struct pktcdvd_device *pd;
|
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};
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#define PSD_POOL_SIZE 64
|
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|
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struct pktcdvd_device
|
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{
|
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struct block_device *bdev; /* dev attached */
|
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dev_t pkt_dev; /* our dev */
|
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char name[20];
|
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struct packet_settings settings;
|
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struct packet_stats stats;
|
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int refcnt; /* Open count */
|
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int write_speed; /* current write speed, kB/s */
|
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int read_speed; /* current read speed, kB/s */
|
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unsigned long offset; /* start offset */
|
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__u8 mode_offset; /* 0 / 8 */
|
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__u8 type;
|
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unsigned long flags;
|
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__u16 mmc3_profile;
|
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__u32 nwa; /* next writable address */
|
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__u32 lra; /* last recorded address */
|
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struct packet_cdrw cdrw;
|
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wait_queue_head_t wqueue;
|
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|
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spinlock_t lock; /* Serialize access to bio_queue */
|
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struct rb_root bio_queue; /* Work queue of bios we need to handle */
|
||||
int bio_queue_size; /* Number of nodes in bio_queue */
|
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bool congested; /* Someone is waiting for bio_queue_size
|
||||
* to drop. */
|
||||
sector_t current_sector; /* Keep track of where the elevator is */
|
||||
atomic_t scan_queue; /* Set to non-zero when pkt_handle_queue */
|
||||
/* needs to be run. */
|
||||
mempool_t rb_pool; /* mempool for pkt_rb_node allocations */
|
||||
|
||||
struct packet_iosched iosched;
|
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struct gendisk *disk;
|
||||
|
||||
int write_congestion_off;
|
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int write_congestion_on;
|
||||
|
||||
struct device *dev; /* sysfs pktcdvd[0-7] dev */
|
||||
|
||||
struct dentry *dfs_d_root; /* debugfs: devname directory */
|
||||
struct dentry *dfs_f_info; /* debugfs: info file */
|
||||
};
|
||||
|
||||
#endif /* __PKTCDVD_H */
|
||||
112
include/uapi/linux/pktcdvd.h
Normal file
112
include/uapi/linux/pktcdvd.h
Normal file
@ -0,0 +1,112 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
||||
/*
|
||||
* Copyright (C) 2000 Jens Axboe <axboe@suse.de>
|
||||
* Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
|
||||
*
|
||||
* May be copied or modified under the terms of the GNU General Public
|
||||
* License. See linux/COPYING for more information.
|
||||
*
|
||||
* Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
|
||||
* DVD-RW devices.
|
||||
*
|
||||
*/
|
||||
#ifndef _UAPI__PKTCDVD_H
|
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#define _UAPI__PKTCDVD_H
|
||||
|
||||
#include <linux/types.h>
|
||||
|
||||
/*
|
||||
* 1 for normal debug messages, 2 is very verbose. 0 to turn it off.
|
||||
*/
|
||||
#define PACKET_DEBUG 1
|
||||
|
||||
#define MAX_WRITERS 8
|
||||
|
||||
#define PKT_RB_POOL_SIZE 512
|
||||
|
||||
/*
|
||||
* How long we should hold a non-full packet before starting data gathering.
|
||||
*/
|
||||
#define PACKET_WAIT_TIME (HZ * 5 / 1000)
|
||||
|
||||
/*
|
||||
* use drive write caching -- we need deferred error handling to be
|
||||
* able to successfully recover with this option (drive will return good
|
||||
* status as soon as the cdb is validated).
|
||||
*/
|
||||
#if defined(CONFIG_CDROM_PKTCDVD_WCACHE)
|
||||
#define USE_WCACHING 1
|
||||
#else
|
||||
#define USE_WCACHING 0
|
||||
#endif
|
||||
|
||||
/*
|
||||
* No user-servicable parts beyond this point ->
|
||||
*/
|
||||
|
||||
/*
|
||||
* device types
|
||||
*/
|
||||
#define PACKET_CDR 1
|
||||
#define PACKET_CDRW 2
|
||||
#define PACKET_DVDR 3
|
||||
#define PACKET_DVDRW 4
|
||||
|
||||
/*
|
||||
* flags
|
||||
*/
|
||||
#define PACKET_WRITABLE 1 /* pd is writable */
|
||||
#define PACKET_NWA_VALID 2 /* next writable address valid */
|
||||
#define PACKET_LRA_VALID 3 /* last recorded address valid */
|
||||
#define PACKET_MERGE_SEGS 4 /* perform segment merging to keep */
|
||||
/* underlying cdrom device happy */
|
||||
|
||||
/*
|
||||
* Disc status -- from READ_DISC_INFO
|
||||
*/
|
||||
#define PACKET_DISC_EMPTY 0
|
||||
#define PACKET_DISC_INCOMPLETE 1
|
||||
#define PACKET_DISC_COMPLETE 2
|
||||
#define PACKET_DISC_OTHER 3
|
||||
|
||||
/*
|
||||
* write type, and corresponding data block type
|
||||
*/
|
||||
#define PACKET_MODE1 1
|
||||
#define PACKET_MODE2 2
|
||||
#define PACKET_BLOCK_MODE1 8
|
||||
#define PACKET_BLOCK_MODE2 10
|
||||
|
||||
/*
|
||||
* Last session/border status
|
||||
*/
|
||||
#define PACKET_SESSION_EMPTY 0
|
||||
#define PACKET_SESSION_INCOMPLETE 1
|
||||
#define PACKET_SESSION_RESERVED 2
|
||||
#define PACKET_SESSION_COMPLETE 3
|
||||
|
||||
#define PACKET_MCN "4a656e734178626f65323030300000"
|
||||
|
||||
#undef PACKET_USE_LS
|
||||
|
||||
#define PKT_CTRL_CMD_SETUP 0
|
||||
#define PKT_CTRL_CMD_TEARDOWN 1
|
||||
#define PKT_CTRL_CMD_STATUS 2
|
||||
|
||||
struct pkt_ctrl_command {
|
||||
__u32 command; /* in: Setup, teardown, status */
|
||||
__u32 dev_index; /* in/out: Device index */
|
||||
__u32 dev; /* in/out: Device nr for cdrw device */
|
||||
__u32 pkt_dev; /* in/out: Device nr for packet device */
|
||||
__u32 num_devices; /* out: Largest device index + 1 */
|
||||
__u32 padding; /* Not used */
|
||||
};
|
||||
|
||||
/*
|
||||
* packet ioctls
|
||||
*/
|
||||
#define PACKET_IOCTL_MAGIC ('X')
|
||||
#define PACKET_CTRL_CMD _IOWR(PACKET_IOCTL_MAGIC, 1, struct pkt_ctrl_command)
|
||||
|
||||
|
||||
#endif /* _UAPI__PKTCDVD_H */
|
||||
Loading…
Reference in New Issue
Block a user