diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/DMA-mapping.txt | 18 | ||||
| -rw-r--r-- | Documentation/DocBook/writing-an-alsa-driver.tmpl | 8 | ||||
| -rw-r--r-- | Documentation/blockdev/00-INDEX | 2 | ||||
| -rw-r--r-- | Documentation/blockdev/mflash.txt | 84 | ||||
| -rw-r--r-- | Documentation/devices.txt | 4 | ||||
| -rw-r--r-- | Documentation/fb/uvesafb.txt | 7 | ||||
| -rw-r--r-- | Documentation/filesystems/00-INDEX | 2 | ||||
| -rw-r--r-- | Documentation/filesystems/nilfs2.txt | 200 | ||||
| -rw-r--r-- | Documentation/hwmon/g760a | 36 | ||||
| -rw-r--r-- | Documentation/isdn/README.gigaset | 52 | ||||
| -rw-r--r-- | Documentation/kprobes.txt | 38 | ||||
| -rw-r--r-- | Documentation/sound/alsa/soc/jack.txt | 71 | ||||
| -rw-r--r-- | Documentation/sysctl/vm.txt | 28 | ||||
| -rw-r--r-- | Documentation/video4linux/pxa_camera.txt | 125 | ||||
| -rw-r--r-- | Documentation/video4linux/v4l2-framework.txt | 21 |
15 files changed, 637 insertions, 59 deletions
diff --git a/Documentation/DMA-mapping.txt b/Documentation/DMA-mapping.txt index b2a4d6d244d9..01f24e94bdb6 100644 --- a/Documentation/DMA-mapping.txt +++ b/Documentation/DMA-mapping.txt @@ -136,7 +136,7 @@ exactly why. The standard 32-bit addressing PCI device would do something like this: - if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) { + if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) { printk(KERN_WARNING "mydev: No suitable DMA available.\n"); goto ignore_this_device; @@ -155,9 +155,9 @@ all 64-bits when accessing streaming DMA: int using_dac; - if (!pci_set_dma_mask(pdev, DMA_64BIT_MASK)) { + if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) { using_dac = 1; - } else if (!pci_set_dma_mask(pdev, DMA_32BIT_MASK)) { + } else if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) { using_dac = 0; } else { printk(KERN_WARNING @@ -170,14 +170,14 @@ the case would look like this: int using_dac, consistent_using_dac; - if (!pci_set_dma_mask(pdev, DMA_64BIT_MASK)) { + if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) { using_dac = 1; consistent_using_dac = 1; - pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK); - } else if (!pci_set_dma_mask(pdev, DMA_32BIT_MASK)) { + pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); + } else if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) { using_dac = 0; consistent_using_dac = 0; - pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK); + pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); } else { printk(KERN_WARNING "mydev: No suitable DMA available.\n"); @@ -192,7 +192,7 @@ check the return value from pci_set_consistent_dma_mask(). Finally, if your device can only drive the low 24-bits of address during PCI bus mastering you might do something like: - if (pci_set_dma_mask(pdev, DMA_24BIT_MASK)) { + if (pci_set_dma_mask(pdev, DMA_BIT_MASK(24))) { printk(KERN_WARNING "mydev: 24-bit DMA addressing not available.\n"); goto ignore_this_device; @@ -213,7 +213,7 @@ most specific mask. Here is pseudo-code showing how this might be done: - #define PLAYBACK_ADDRESS_BITS DMA_32BIT_MASK + #define PLAYBACK_ADDRESS_BITS DMA_BIT_MASK(32) #define RECORD_ADDRESS_BITS 0x00ffffff struct my_sound_card *card; diff --git a/Documentation/DocBook/writing-an-alsa-driver.tmpl b/Documentation/DocBook/writing-an-alsa-driver.tmpl index 46b08fef3744..7a2e0e98986a 100644 --- a/Documentation/DocBook/writing-an-alsa-driver.tmpl +++ b/Documentation/DocBook/writing-an-alsa-driver.tmpl @@ -1137,8 +1137,8 @@ if (err < 0) return err; /* check PCI availability (28bit DMA) */ - if (pci_set_dma_mask(pci, DMA_28BIT_MASK) < 0 || - pci_set_consistent_dma_mask(pci, DMA_28BIT_MASK) < 0) { + if (pci_set_dma_mask(pci, DMA_BIT_MASK(28)) < 0 || + pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(28)) < 0) { printk(KERN_ERR "error to set 28bit mask DMA\n"); pci_disable_device(pci); return -ENXIO; @@ -1252,8 +1252,8 @@ err = pci_enable_device(pci); if (err < 0) return err; - if (pci_set_dma_mask(pci, DMA_28BIT_MASK) < 0 || - pci_set_consistent_dma_mask(pci, DMA_28BIT_MASK) < 0) { + if (pci_set_dma_mask(pci, DMA_BIT_MASK(28)) < 0 || + pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(28)) < 0) { printk(KERN_ERR "error to set 28bit mask DMA\n"); pci_disable_device(pci); return -ENXIO; diff --git a/Documentation/blockdev/00-INDEX b/Documentation/blockdev/00-INDEX index 86f054c47013..c08df56dd91b 100644 --- a/Documentation/blockdev/00-INDEX +++ b/Documentation/blockdev/00-INDEX @@ -8,6 +8,8 @@ cpqarray.txt - info on using Compaq's SMART2 Intelligent Disk Array Controllers. floppy.txt - notes and driver options for the floppy disk driver. +mflash.txt + - info on mGine m(g)flash driver for linux. nbd.txt - info on a TCP implementation of a network block device. paride.txt diff --git a/Documentation/blockdev/mflash.txt b/Documentation/blockdev/mflash.txt new file mode 100644 index 000000000000..1f610ecf698a --- /dev/null +++ b/Documentation/blockdev/mflash.txt @@ -0,0 +1,84 @@ +This document describes m[g]flash support in linux. + +Contents + 1. Overview + 2. Reserved area configuration + 3. Example of mflash platform driver registration + +1. Overview + +Mflash and gflash are embedded flash drive. The only difference is mflash is +MCP(Multi Chip Package) device. These two device operate exactly same way. +So the rest mflash repersents mflash and gflash altogether. + +Internally, mflash has nand flash and other hardware logics and supports +2 different operation (ATA, IO) modes. ATA mode doesn't need any new +driver and currently works well under standard IDE subsystem. Actually it's +one chip SSD. IO mode is ATA-like custom mode for the host that doesn't have +IDE interface. + +Followings are brief descriptions about IO mode. +A. IO mode based on ATA protocol and uses some custom command. (read confirm, +write confirm) +B. IO mode uses SRAM bus interface. +C. IO mode supports 4kB boot area, so host can boot from mflash. + +2. Reserved area configuration +If host boot from mflash, usually needs raw area for boot loader image. All of +the mflash's block device operation will be taken this value as start offset. +Note that boot loader's size of reserved area and kernel configuration value +must be same. + +3. Example of mflash platform driver registration +Working mflash is very straight forward. Adding platform device stuff to board +configuration file is all. Here is some pseudo example. + +static struct mg_drv_data mflash_drv_data = { + /* If you want to polling driver set to 1 */ + .use_polling = 0, + /* device attribution */ + .dev_attr = MG_BOOT_DEV +}; + +static struct resource mg_mflash_rsc[] = { + /* Base address of mflash */ + [0] = { + .start = 0x08000000, + .end = 0x08000000 + SZ_64K - 1, + .flags = IORESOURCE_MEM + }, + /* mflash interrupt pin */ + [1] = { + .start = IRQ_GPIO(84), + .end = IRQ_GPIO(84), + .flags = IORESOURCE_IRQ + }, + /* mflash reset pin */ + [2] = { + .start = 43, + .end = 43, + .name = MG_RST_PIN, + .flags = IORESOURCE_IO + }, + /* mflash reset-out pin + * If you use mflash as storage device (i.e. other than MG_BOOT_DEV), + * should assign this */ + [3] = { + .start = 51, + .end = 51, + .name = MG_RSTOUT_PIN, + .flags = IORESOURCE_IO + } +}; + +static struct platform_device mflash_dev = { + .name = MG_DEV_NAME, + .id = -1, + .dev = { + .platform_data = &mflash_drv_data, + }, + .num_resources = ARRAY_SIZE(mg_mflash_rsc), + .resource = mg_mflash_rsc +}; + +platform_device_register(&mflash_dev); diff --git a/Documentation/devices.txt b/Documentation/devices.txt index 4d70df63d1d3..53d64d382343 100644 --- a/Documentation/devices.txt +++ b/Documentation/devices.txt @@ -2797,6 +2797,10 @@ Your cooperation is appreciated. 206 = /dev/ttySC1 SC26xx serial port 1 207 = /dev/ttySC2 SC26xx serial port 2 208 = /dev/ttySC3 SC26xx serial port 3 + 209 = /dev/ttyMAX0 MAX3100 serial port 0 + 210 = /dev/ttyMAX1 MAX3100 serial port 1 + 211 = /dev/ttyMAX2 MAX3100 serial port 2 + 212 = /dev/ttyMAX3 MAX3100 serial port 3 205 char Low-density serial ports (alternate device) 0 = /dev/culu0 Callout device for ttyLU0 diff --git a/Documentation/fb/uvesafb.txt b/Documentation/fb/uvesafb.txt index 7ac3c4078ff9..eefdd91d298a 100644 --- a/Documentation/fb/uvesafb.txt +++ b/Documentation/fb/uvesafb.txt @@ -59,7 +59,8 @@ Accepted options: ypan Enable display panning using the VESA protected mode interface. The visible screen is just a window of the video memory, console scrolling is done by changing the - start of the window. Available on x86 only. + start of the window. This option is available on x86 + only and is the default option on that architecture. ywrap Same as ypan, but assumes your gfx board can wrap-around the video memory (i.e. starts reading from top if it @@ -67,7 +68,7 @@ ywrap Same as ypan, but assumes your gfx board can wrap-around Available on x86 only. redraw Scroll by redrawing the affected part of the screen, this - is the safe (and slow) default. + is the default on non-x86. (If you're using uvesafb as a module, the above three options are used a parameter of the scroll option, e.g. scroll=ypan.) @@ -182,7 +183,7 @@ from the Video BIOS if you set pixclock to 0 in fb_var_screeninfo. -- Michal Januszewski <spock@gentoo.org> - Last updated: 2007-06-16 + Last updated: 2009-03-30 Documentation of the uvesafb options is loosely based on vesafb.txt. diff --git a/Documentation/filesystems/00-INDEX b/Documentation/filesystems/00-INDEX index 52cd611277a3..8dd6db76171d 100644 --- a/Documentation/filesystems/00-INDEX +++ b/Documentation/filesystems/00-INDEX @@ -68,6 +68,8 @@ ncpfs.txt - info on Novell Netware(tm) filesystem using NCP protocol. nfsroot.txt - short guide on setting up a diskless box with NFS root filesystem. +nilfs2.txt + - info and mount options for the NILFS2 filesystem. ntfs.txt - info and mount options for the NTFS filesystem (Windows NT). ocfs2.txt diff --git a/Documentation/filesystems/nilfs2.txt b/Documentation/filesystems/nilfs2.txt new file mode 100644 index 000000000000..55c4300abfcb --- /dev/null +++ b/Documentation/filesystems/nilfs2.txt @@ -0,0 +1,200 @@ +NILFS2 +------ + +NILFS2 is a log-structured file system (LFS) supporting continuous +snapshotting. In addition to versioning capability of the entire file +system, users can even restore files mistakenly overwritten or +destroyed just a few seconds ago. Since NILFS2 can keep consistency +like conventional LFS, it achieves quick recovery after system +crashes. + +NILFS2 creates a number of checkpoints every few seconds or per +synchronous write basis (unless there is no change). Users can select +significant versions among continuously created checkpoints, and can +change them into snapshots which will be preserved until they are +changed back to checkpoints. + +There is no limit on the number of snapshots until the volume gets +full. Each snapshot is mountable as a read-only file system +concurrently with its writable mount, and this feature is convenient +for online backup. + +The userland tools are included in nilfs-utils package, which is +available from the following download page. At least "mkfs.nilfs2", +"mount.nilfs2", "umount.nilfs2", and "nilfs_cleanerd" (so called +cleaner or garbage collector) are required. Details on the tools are +described in the man pages included in the package. + +Project web page: http://www.nilfs.org/en/ +Download page: http://www.nilfs.org/en/download.html +Git tree web page: http://www.nilfs.org/git/ +NILFS mailing lists: http://www.nilfs.org/mailman/listinfo/users + +Caveats +======= + +Features which NILFS2 does not support yet: + + - atime + - extended attributes + - POSIX ACLs + - quotas + - writable snapshots + - remote backup (CDP) + - data integrity + - defragmentation + +Mount options +============= + +NILFS2 supports the following mount options: +(*) == default + +barrier=on(*) This enables/disables barriers. barrier=off disables + it, barrier=on enables it. +errors=continue(*) Keep going on a filesystem error. +errors=remount-ro Remount the filesystem read-only on an error. +errors=panic Panic and halt the machine if an error occurs. +cp=n Specify the checkpoint-number of the snapshot to be + mounted. Checkpoints and snapshots are listed by lscp + user command. Only the checkpoints marked as snapshot + are mountable with this option. Snapshot is read-only, + so a read-only mount option must be specified together. +order=relaxed(*) Apply relaxed order semantics that allows modified data + blocks to be written to disk without making a + checkpoint if no metadata update is going. This mode + is equivalent to the ordered data mode of the ext3 + filesystem except for the updates on data blocks still + conserve atomicity. This will improve synchronous + write performance for overwriting. +order=strict Apply strict in-order semantics that preserves sequence + of all file operations including overwriting of data + blocks. That means, it is guaranteed that no + overtaking of events occurs in the recovered file + system after a crash. + +NILFS2 usage +============ + +To use nilfs2 as a local file system, simply: + + # mkfs -t nilfs2 /dev/block_device + # mount -t nilfs2 /dev/block_device /dir + +This will also invoke the cleaner through the mount helper program +(mount.nilfs2). + +Checkpoints and snapshots are managed by the following commands. +Their manpages are included in the nilfs-utils package above. + + lscp list checkpoints or snapshots. + mkcp make a checkpoint or a snapshot. + chcp change an existing checkpoint to a snapshot or vice versa. + rmcp invalidate specified checkpoint(s). + +To mount a snapshot, + + # mount -t nilfs2 -r -o cp=<cno> /dev/block_device /snap_dir + +where <cno> is the checkpoint number of the snapshot. + +To unmount the NILFS2 mount point or snapshot, simply: + + # umount /dir + +Then, the cleaner daemon is automatically shut down by the umount +helper program (umount.nilfs2). + +Disk format +=========== + +A nilfs2 volume is equally divided into a number of segments except +for the super block (SB) and segment #0. A segment is the container +of logs. Each log is composed of summary information blocks, payload +blocks, and an optional super root block (SR): + + ______________________________________________________ + | |SB| | Segment | Segment | Segment | ... | Segment | | + |_|__|_|____0____|____1____|____2____|_____|____N____|_| + 0 +1K +4K +8M +16M +24M +(8MB x N) + . . (Typical offsets for 4KB-block) + . . + .______________________. + | log | log |... | log | + |__1__|__2__|____|__m__| + . . + . . + . . + .______________________________. + | Summary | Payload blocks |SR| + |_blocks__|_________________|__| + +The payload blocks are organized per file, and each file consists of +data blocks and B-tree node blocks: + + |<--- File-A --->|<--- File-B --->| + _______________________________________________________________ + | Data blocks | B-tree blocks | Data blocks | B-tree blocks | ... + _|_____________|_______________|_____________|_______________|_ + + +Since only the modified blocks are written in the log, it may have +files without data blocks or B-tree node blocks. + +The organization of the blocks is recorded in the summary information +blocks, which contains a header structure (nilfs_segment_summary), per +file structures (nilfs_finfo), and per block structures (nilfs_binfo): + + _________________________________________________________________________ + | Summary | finfo | binfo | ... | binfo | finfo | binfo | ... | binfo |... + |_blocks__|___A___|_(A,1)_|_____|(A,Na)_|___B___|_(B,1)_|_____|(B,Nb)_|___ + + +The logs include regular files, directory files, symbolic link files +and several meta data files. The mata data files are the files used +to maintain file system meta data. The current version of NILFS2 uses +the following meta data files: + + 1) Inode file (ifile) -- Stores on-disk inodes + 2) Checkpoint file (cpfile) -- Stores checkpoints + 3) Segment usage file (sufile) -- Stores allocation state of segments + 4) Data address translation file -- Maps virtual block numbers to usual + (DAT) block numbers. This file serves to + make on-disk blocks relocatable. + +The following figure shows a typical organization of the logs: + + _________________________________________________________________________ + | Summary | regular file | file | ... | ifile | cpfile | sufile | DAT |SR| + |_blocks__|_or_directory_|_______|_____|_______|________|________|_____|__| + + +To stride over segment boundaries, this sequence of files may be split +into multiple logs. The sequence of logs that should be treated as +logically one log, is delimited with flags marked in the segment +summary. The recovery code of nilfs2 looks this boundary information +to ensure atomicity of updates. + +The super root block is inserted for every checkpoints. It includes +three special inodes, inodes for the DAT, cpfile, and sufile. Inodes +of regular files, directories, symlinks and other special files, are +included in the ifile. The inode of ifile itself is included in the +corresponding checkpoint entry in the cpfile. Thus, the hierarchy +among NILFS2 files can be depicted as follows: + + Super block (SB) + | + v + Super root block (the latest cno=xx) + |-- DAT + |-- sufile + `-- cpfile + |-- ifile (cno=c1) + |-- ifile (cno=c2) ---- file (ino=i1) + : : |-- file (ino=i2) + `-- ifile (cno=xx) |-- file (ino=i3) + : : + `-- file (ino=yy) + ( regular file, directory, or symlink ) + +For detail on the format of each file, please see include/linux/nilfs2_fs.h. diff --git a/Documentation/hwmon/g760a b/Documentation/hwmon/g760a new file mode 100644 index 000000000000..e032eeb75629 --- /dev/null +++ b/Documentation/hwmon/g760a @@ -0,0 +1,36 @@ +Kernel driver g760a +=================== + +Supported chips: + * Global Mixed-mode Technology Inc. G760A + Prefix: 'g760a' + Datasheet: Publicly available at the GMT website + http://www.gmt.com.tw/datasheet/g760a.pdf + +Author: Herbert Valerio Riedel <hvr@gnu.org> + +Description +----------- + +The GMT G760A Fan Speed PWM Controller is connected directly to a fan +and performs closed-loop control of the fan speed. + +The fan speed is programmed by setting the period via 'pwm1' of two +consecutive speed pulses. The period is defined in terms of clock +cycle counts of an assumed 32kHz clock source. + +Setting a period of 0 stops the fan; setting the period to 255 sets +fan to maximum speed. + +The measured fan rotation speed returned via 'fan1_input' is derived +from the measured speed pulse period by assuming again a 32kHz clock +source and a 2 pulse-per-revolution fan. + +The 'alarms' file provides access to the two alarm bits provided by +the G760A chip's status register: Bit 0 is set when the actual fan +speed differs more than 20% with respect to the programmed fan speed; +bit 1 is set when fan speed is below 1920 RPM. + +The g760a driver will not update its values more frequently than every +other second; reading them more often will do no harm, but will return +'old' values. diff --git a/Documentation/isdn/README.gigaset b/Documentation/isdn/README.gigaset index 55b2852904a4..02c0e9341dd8 100644 --- a/Documentation/isdn/README.gigaset +++ b/Documentation/isdn/README.gigaset @@ -61,24 +61,28 @@ GigaSet 307x Device Driver --------------------- 2.1. Modules ------- - To get the device working, you have to load the proper kernel module. You - can do this using - modprobe modulename - where modulename is ser_gigaset (M101), usb_gigaset (M105), or - bas_gigaset (direct USB connection to the base). + For the devices to work, the proper kernel modules have to be loaded. + This normally happens automatically when the system detects the USB + device (base, M105) or when the line discipline is attached (M101). It + can also be triggered manually using the modprobe(8) command, for example + for troubleshooting or to pass module parameters. The module ser_gigaset provides a serial line discipline N_GIGASET_M101 - which drives the device through the regular serial line driver. To use it, - run the Gigaset M101 daemon "gigasetm101d" (also available from - http://sourceforge.net/projects/gigaset307x/) with the device file of the - RS232 port to the M101 as an argument, for example: - gigasetm101d /dev/ttyS1 - This will open the device file, set its line discipline to N_GIGASET_M101, - and then sleep in the background, keeping the device open so that the - line discipline remains active. To deactivate it, kill the daemon, for - example with - killall gigasetm101d - before disconnecting the device. + which drives the device through the regular serial line driver. It must + be attached to the serial line to which the M101 is connected with the + ldattach(8) command (requires util-linux-ng release 2.14 or later), for + example: + ldattach GIGASET_M101 /dev/ttyS1 + This will open the device file, attach the line discipline to it, and + then sleep in the background, keeping the device open so that the line + discipline remains active. To deactivate it, kill the daemon, for example + with + killall ldattach + before disconnecting the device. To have this happen automatically at + system startup/shutdown on an LSB compatible system, create and activate + an appropriate LSB startup script /etc/init.d/gigaset. (The init name + 'gigaset' is officially assigned to this project by LANANA.) + Alternatively, just add the 'ldattach' command line to /etc/rc.local. 2.2. Device nodes for user space programs ------------------------------------ @@ -194,10 +198,11 @@ GigaSet 307x Device Driver operation (for wireless access to the base), but are needed for access to the M105's own configuration mode (registration to the base, baudrate and line format settings, device status queries) via the gigacontr - utility. Their use is disabled in the driver by default for safety - reasons but can be enabled by setting the kernel configuration option - "Support for undocumented USB requests" (GIGASET_UNDOCREQ) to "Y" and - recompiling. + utility. Their use is controlled by the kernel configuration option + "Support for undocumented USB requests" (CONFIG_GIGASET_UNDOCREQ). If you + encounter error code -ENOTTY when trying to use some features of the + M105, try setting that option to "y" via 'make {x,menu}config' and + recompiling the driver. 3. Troubleshooting @@ -228,6 +233,13 @@ GigaSet 307x Device Driver Solution: Select Unimodem mode for all DECT data adapters. (see section 2.4.) + Problem: + You want to configure your USB DECT data adapter (M105) but gigacontr + reports an error: "/dev/ttyGU0: Inappropriate ioctl for device". + Solution: + Recompile the usb_gigaset driver with the kernel configuration option + CONFIG_GIGASET_UNDOCREQ set to 'y'. (see section 2.6.) + 3.2. Telling the driver to provide more information ---------------------------------------------- Building the driver with the "Gigaset debugging" kernel configuration diff --git a/Documentation/kprobes.txt b/Documentation/kprobes.txt index 48b3de90eb1e..1e7a769a10f9 100644 --- a/Documentation/kprobes.txt +++ b/Documentation/kprobes.txt @@ -212,7 +212,9 @@ hit, Kprobes calls kp->pre_handler. After the probed instruction is single-stepped, Kprobe calls kp->post_handler. If a fault occurs during execution of kp->pre_handler or kp->post_handler, or during single-stepping of the probed instruction, Kprobes calls -kp->fault_handler. Any or all handlers can be NULL. +kp->fault_handler. Any or all handlers can be NULL. If kp->flags +is set KPROBE_FLAG_DISABLED, that kp will be registered but disabled, +so, it's handlers aren't hit until calling enable_kprobe(kp). NOTE: 1. With the introduction of the "symbol_name" field to struct kprobe, @@ -363,6 +365,26 @@ probes) in the specified array, they clear the addr field of those incorrect probes. However, other probes in the array are unregistered correctly. +4.7 disable_*probe + +#include <linux/kprobes.h> +int disable_kprobe(struct kprobe *kp); +int disable_kretprobe(struct kretprobe *rp); +int disable_jprobe(struct jprobe *jp); + +Temporarily disables the specified *probe. You can enable it again by using +enable_*probe(). You must specify the probe which has been registered. + +4.8 enable_*probe + +#include <linux/kprobes.h> +int enable_kprobe(struct kprobe *kp); +int enable_kretprobe(struct kretprobe *rp); +int enable_jprobe(struct jprobe *jp); + +Enables *probe which has been disabled by disable_*probe(). You must specify +the probe which has been registered. + 5. Kprobes Features and Limitations Kprobes allows multiple probes at the same address. Currently, @@ -500,10 +522,14 @@ the probe. If the probed function belongs to a module, the module name is also specified. Following columns show probe status. If the probe is on a virtual address that is no longer valid (module init sections, module virtual addresses that correspond to modules that've been unloaded), -such probes are marked with [GONE]. +such probes are marked with [GONE]. If the probe is temporarily disabled, +such probes are marked with [DISABLED]. -/debug/kprobes/enabled: Turn kprobes ON/OFF +/debug/kprobes/enabled: Turn kprobes ON/OFF forcibly. -Provides a knob to globally turn registered kprobes ON or OFF. By default, -all kprobes are enabled. By echoing "0" to this file, all registered probes -will be disarmed, till such time a "1" is echoed to this file. +Provides a knob to globally and forcibly turn registered kprobes ON or OFF. +By default, all kprobes are enabled. By echoing "0" to this file, all +registered probes will be disarmed, till such time a "1" is echoed to this +file. Note that this knob just disarms and arms all kprobes and doesn't +change each probe's disabling state. This means that disabled kprobes (marked +[DISABLED]) will be not enabled if you turn ON all kprobes by this knob. diff --git a/Documentation/sound/alsa/soc/jack.txt b/Documentation/sound/alsa/soc/jack.txt new file mode 100644 index 000000000000..fcf82a417293 --- /dev/null +++ b/Documentation/sound/alsa/soc/jack.txt @@ -0,0 +1,71 @@ +ASoC jack detection +=================== + +ALSA has a standard API for representing physical jacks to user space, +the kernel side of which can be seen in include/sound/jack.h. ASoC +provides a version of this API adding two additional features: + + - It allows more than one jack detection method to work together on one + user visible jack. In embedded systems it is common for multiple + to be present on a single jack but handled by separate bits of + hardware. + + - Integration with DAPM, allowing DAPM endpoints to be updated + automatically based on the detected jack status (eg, turning off the + headphone outputs if no headphones are present). + +This is done by splitting the jacks up into three things working +together: the jack itself represented by a struct snd_soc_jack, sets of +snd_soc_jack_pins representing DAPM endpoints to update and blocks of +code providing jack reporting mechanisms. + +For example, a system may have a stereo headset jack with two reporting +mechanisms, one for the headphone and one for the microphone. Some +systems won't be able to use their speaker output while a headphone is +connected and so will want to make sure to update both speaker and +headphone when the headphone jack status changes. + +The jack - struct snd_soc_jack +============================== + +This represents a physical jack on the system and is what is visible to +user space. The jack itself is completely passive, it is set up by the +machine driver and updated by jack detection methods. + +Jacks are created by the machine driver calling snd_soc_jack_new(). + +snd_soc_jack_pin +================ + +These represent a DAPM pin to update depending on some of the status +bits supported by the jack. Each snd_soc_jack has zero or more of these +which are updated automatically. They are created by the machine driver +and associated with the jack using snd_soc_jack_add_pins(). The status +of the endpoint may configured to be the opposite of the jack status if +required (eg, enabling a built in microphone if a microphone is not +connected via a jack). + +Jack detection methods +====================== + +Actual jack detection is done by code which is able to monitor some +input to the system and update a jack by calling snd_soc_jack_report(), +specifying a subset of bits to update. The jack detection code should +be set up by the machine driver, taking configuration for the jack to +update and the set of things to report when the jack is connected. + +Often this is done based on the status of a GPIO - a handler for this is +provided by the snd_soc_jack_add_gpio() function. Other methods are +also available, for example integrated into CODECs. One example of +CODEC integrated jack detection can be see in the WM8350 driver. + +Each jack may have multiple reporting mechanisms, though it will need at +least one to be useful. + +Machine drivers +=============== + +These are all hooked together by the machine driver depending on the +system hardware. The machine driver will set up the snd_soc_jack and +the list of pins to update then set up one or more jack detection +mechanisms to update that jack based on their current status. diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 3197fc83bc51..97c4b3284329 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -39,6 +39,8 @@ Currently, these files are in /proc/sys/vm: - nr_hugepages - nr_overcommit_hugepages - nr_pdflush_threads +- nr_pdflush_threads_min +- nr_pdflush_threads_max - nr_trim_pages (only if CONFIG_MMU=n) - numa_zonelist_order - oom_dump_tasks @@ -463,6 +465,32 @@ The default value is 0. ============================================================== +nr_pdflush_threads_min + +This value controls the minimum number of pdflush threads. + +At boot time, the kernel will create and maintain 'nr_pdflush_threads_min' +threads for the kernel's lifetime. + +The default value is 2. The minimum value you can specify is 1, and +the maximum value is the current setting of 'nr_pdflush_threads_max'. + +See 'nr_pdflush_threads_max' below for more information. + +============================================================== + +nr_pdflush_threads_max + +This value controls the maximum number of pdflush threads that can be +created. The pdflush algorithm will create a new pdflush thread (up to +this maximum) if no pdflush threads have been available for >= 1 second. + +The default value is 8. The minimum value you can specify is the +current value of 'nr_pdflush_threads_min' and the +maximum is 1000. + +============================================================== + overcommit_memory: This value contains a flag that enables memory overcommitment. diff --git a/Documentation/video4linux/pxa_camera.txt b/Documentation/video4linux/pxa_camera.txt new file mode 100644 index 000000000000..b1137f9a53eb --- /dev/null +++ b/Documentation/video4linux/pxa_camera.txt @@ -0,0 +1,125 @@ + PXA-Camera Host Driver + ====================== + +Constraints +----------- + a) Image size for YUV422P format + All YUV422P images are enforced to have width x height % 16 = 0. + This is due to DMA constraints, which transfers only planes of 8 byte + multiples. + + +Global video workflow +--------------------- + a) QCI stopped + Initialy, the QCI interface is stopped. + When a buffer is queued (pxa_videobuf_ops->buf_queue), the QCI starts. + + b) QCI started + More buffers can be queued while the QCI is started without halting the + capture. The new buffers are "appended" at the tail of the DMA chain, and + smoothly captured one frame after the other. + + Once a buffer is filled in the QCI interface, it is marked as "DONE" and + removed from the active buffers list. It can be then requeud or dequeued by + userland application. + + Once the last buffer is filled in, the QCI interface stops. + + +DMA usage +--------- + a) DMA flow + - first buffer queued for capture + Once a first buffer is queued for capture, the QCI is started, but data + transfer is not started. On "End Of Frame" interrupt, the irq handler + starts the DMA chain. + - capture of one videobuffer + The DMA chain starts transfering data into videobuffer RAM pages. + When all pages are transfered, the DMA irq is raised on "ENDINTR" status + - finishing one videobuffer + The DMA irq handler marks the videobuffer as "done", and removes it from + the active running queue + Meanwhile, the next videobuffer (if there is one), is transfered by DMA + - finishing the last videobuffer + On the DMA irq of the last videobuffer, the QCI is stopped. + + b) DMA prepared buffer will have this structure + + +------------+-----+---------------+-----------------+ + | desc-sg[0] | ... | desc-sg[last] | finisher/linker | + +------------+-----+---------------+-----------------+ + + This structure is pointed by dma->sg_cpu. + The descriptors are used as follows : + - desc-sg[i]: i-th descriptor, transfering the i-th sg + element to the video buffer scatter gather + - finisher: has ddadr=DADDR_STOP, dcmd=ENDIRQEN + - linker: has ddadr= desc-sg[0] of next video buffer, dcmd=0 + + For the next schema, let's assume d0=desc-sg[0] .. dN=desc-sg[N], + "f" stands for finisher and "l" for linker. + A typical running chain is : + + Videobuffer 1 Videobuffer 2 + +---------+----+---+ +----+----+----+---+ + | d0 | .. | dN | l | | d0 | .. | dN | f | + +---------+----+-|-+ ^----+----+----+---+ + | | + +----+ + + After the chaining is finished, the chain looks like : + + Videobuffer 1 Videobuffer 2 Videobuffer 3 + +---------+----+---+ +----+----+----+---+ +----+----+----+---+ + | d0 | .. | dN | l | | d0 | .. | dN | l | | d0 | .. | dN | f | + +---------+----+-|-+ ^----+----+----+-|-+ ^----+----+----+---+ + | | | | + +----+ +----+ + new_link + + c) DMA hot chaining timeslice issue + + As DMA chaining is done while DMA _is_ running, the linking may be done + while the DMA jumps from one Videobuffer to another. On the schema, that + would be a problem if the following sequence is encountered : + + - DMA chain is Videobuffer1 + Videobuffer2 + - pxa_videobuf_queue() is called to queue Videobuffer3 + - DMA controller finishes Videobuffer2, and DMA stops + => + Videobuffer 1 Videobuffer 2 + +---------+----+---+ +----+----+----+---+ + | d0 | .. | dN | l | | d0 | .. | dN | f | + +---------+----+-|-+ ^----+----+----+-^-+ + | | | + +----+ +-- DMA DDADR loads DDADR_STOP + + - pxa_dma_add_tail_buf() is called, the Videobuffer2 "finisher" is + replaced by a "linker" to Videobuffer3 (creation of new_link) + - pxa_videobuf_queue() finishes + - the DMA irq handler is called, which terminates Videobuffer2 + - Videobuffer3 capture is not scheduled on DMA chain (as it stopped !!!) + + Videobuffer 1 Videobuffer 2 Videobuffer 3 + +---------+----+---+ +----+----+----+---+ +----+----+----+---+ + | d0 | .. | dN | l | | d0 | .. | dN | l | | d0 | .. | dN | f | + +---------+----+-|-+ ^----+----+----+-|-+ ^----+----+----+---+ + | | | | + +----+ +----+ + new_link + DMA DDADR still is DDADR_STOP + + - pxa_camera_check_link_miss() is called + This checks if the DMA is finished and a buffer is still on the + pcdev->capture list. If that's the case, the capture will be restarted, + and Videobuffer3 is scheduled on DMA chain. + - the DMA irq handler finishes + + Note: if DMA stops just after pxa_camera_check_link_miss() reads DDADR() + value, we have the guarantee that the DMA irq handler will be called back + when the DMA will finish the buffer, and pxa_camera_check_link_miss() will + be called again, to reschedule Videobuffer3. + +-- +Author: Robert Jarzmik <robert.jarzmik@free.fr> diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt index a31177390e55..854808b67fae 100644 --- a/Documentation/video4linux/v4l2-framework.txt +++ b/Documentation/video4linux/v4l2-framework.txt @@ -90,7 +90,7 @@ up before calling v4l2_device_register then it will be untouched. If dev is NULL, then you *must* setup v4l2_dev->name before calling v4l2_device_register. The first 'dev' argument is normally the struct device pointer of a pci_dev, -usb_device or platform_device. It is rare for dev to be NULL, but it happens +usb_interface or platform_device. It is rare for dev to be NULL, but it happens with ISA devices or when one device creates multiple PCI devices, thus making it impossible to associate v4l2_dev with a particular parent. @@ -351,17 +351,6 @@ And this to go from an i2c_client to a v4l2_subdev struct: struct v4l2_subdev *sd = i2c_get_clientdata(client); -Finally you need to make a command function to make driver->command() -call the right subdev_ops functions: - -static int subdev_command(struct i2c_client *client, unsigned cmd, void *arg) -{ - return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg); -} - -If driver->command is never used then you can leave this out. Eventually the -driver->command usage should be removed from v4l. - Make sure to call v4l2_device_unregister_subdev(sd) when the remove() callback is called. This will unregister the sub-device from the bridge driver. It is safe to call this even if the sub-device was never registered. @@ -375,14 +364,12 @@ from the remove() callback ensures that this is always done correctly. The bridge driver also has some helper functions it can use: -struct v4l2_subdev *sd = v4l2_i2c_new_subdev(adapter, "module_foo", "chipid", 0x36); +struct v4l2_subdev *sd = v4l2_i2c_new_subdev(v4l2_dev, adapter, + "module_foo", "chipid", 0x36); This loads the given module (can be NULL if no module needs to be loaded) and calls i2c_new_device() with the given i2c_adapter and chip/address arguments. -If all goes well, then it registers the subdev with the v4l2_device. It gets -the v4l2_device by calling i2c_get_adapdata(adapter), so you should make sure -to call i2c_set_adapdata(adapter, v4l2_device) when you setup the i2c_adapter -in your driver. +If all goes well, then it registers the subdev with the v4l2_device. You can also use v4l2_i2c_new_probed_subdev() which is very similar to v4l2_i2c_new_subdev(), except that it has an array of possible I2C addresses |