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Support for network splice receive.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Allow caller to pass in a release function, there might be
other resources that need releasing as well. Needed for
network receive.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6: (197 commits)
sh: add spi header and r2d platform data V3
sh: update r7780rp interrupt code
sh: remove consistent alloc stuff from the machine vector
sh: use declared coherent memory for dreamcast pci ethernet adapter
sh: declared coherent memory support V2
sh: Add support for SDK7780 board.
sh: constify function pointer tables
sh: Kill off -traditional for linker script.
cdrom: Add support for Sega Dreamcast GD-ROM.
sh: Kill off hs7751rvoip reference from arch/sh/Kconfig.
sh: Drop r7780rp_defconfig, use r7780mp_defconfig as kbuild default.
sh: Kill off dead HS771RVoIP board support.
sh: r7785rp: Fix up DECLARE_INTC_DESC() arg mismatch.
sh: r7785rp: Hook up the rest of the HL7785 FPGA IRQ vectors.
sh: r2d - enable sm501 usb host function
sh: remove voyagergx
sh: r2d - add lcd planel timings to sm501 platform data
sh: Add OHCI and UDC platform devices for SH7720.
sh: intc - remove default interrupt priority tables
sh: Correct pte size mismatch for X2 TLB.
...
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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid: (24 commits)
HID: ADS/Tech Radio si470x needs blacklist entry
HID: Logitech Extreme 3D needs NOGET quirk
HID: Refactor MS Presenter 8K key mapping
HID: MS Presenter mapping for PID 0x0701
HID: Support Samsung IR remote
HID: fix compilation of hidbp drivers without usbhid
HID: Blacklist the Gretag-Macbeth Huey display colorimeter
HID: the `bit' in hidinput_mapping_quirks() is an out parameter
HID: remove redundant WARN_ON()s in order not to scare users
HID: force hiddev creation for SONY PS3 controller
HID: Use hid blacklist in usbmouse/usbkbd
HID: proper handling of MS 4k and 6k devices
HID: remove unused variable in quirk event handler
HID: hid-input quirk for BTC 8193
HID: separate hid-input event quirks from generic code
HID: refactor mapping to input subsystem for quirky devices
HID: Microsoft Wireless Optical Desktop 3.0 quirk
HID: Add support for Logitech Elite keyboards
HID: add full support for Genius KB-29E
HID: fix a potential bug in pointer casting
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* 'for-2.6.25' of git://git.kernel.dk/linux-2.6-block:
block: implement drain buffers
__bio_clone: don't calculate hw/phys segment counts
block: allow queue dma_alignment of zero
blktrace: Add blktrace ioctls to SCSI generic devices
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* 'blk-end-request' of git://git.kernel.dk/linux-2.6-block: (30 commits)
blk_end_request: changing xsysace (take 4)
blk_end_request: changing ub (take 4)
blk_end_request: cleanup of request completion (take 4)
blk_end_request: cleanup 'uptodate' related code (take 4)
blk_end_request: remove/unexport end_that_request_* (take 4)
blk_end_request: changing scsi (take 4)
blk_end_request: add bidi completion interface (take 4)
blk_end_request: changing ide-cd (take 4)
blk_end_request: add callback feature (take 4)
blk_end_request: changing ide normal caller (take 4)
blk_end_request: changing cpqarray (take 4)
blk_end_request: changing cciss (take 4)
blk_end_request: changing ide-scsi (take 4)
blk_end_request: changing s390 (take 4)
blk_end_request: changing mmc (take 4)
blk_end_request: changing i2o_block (take 4)
blk_end_request: changing viocd (take 4)
blk_end_request: changing xen-blkfront (take 4)
blk_end_request: changing viodasd (take 4)
blk_end_request: changing sx8 (take 4)
...
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* 'sg' of git://git.kernel.dk/linux-2.6-block:
SG: work with the SCSI fixed maximum allocations.
SG: Convert SCSI to use scatterlist helpers for sg chaining
SG: Move functions to lib/scatterlist.c and add sg chaining allocator helpers
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* 'cfq-ioc-share' of git://git.kernel.dk/linux-2.6-block:
cfq-iosched: kill some big inlines
cfq-iosched: relax IOPRIO_CLASS_IDLE restrictions
kernel: add CLONE_IO to specifically request sharing of IO contexts
io_context sharing - anticipatory changes
block: cfq: make the io contect sharing lockless
io_context sharing - cfq changes
io context sharing: preliminary support
ioprio: move io priority from task_struct to io_context
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Samsung USB remotes (0419:0001) are rejected by kernel 2.6.23, because the
report descriptor from the remote contains a 48 bit HID report field. HID 1.11
states: Fields may span at most 4 bytes.
This patch, based on 2.6.23, fixes this by modifying the internal report
descriptor in hid-quirks.c. Additional user space support (e.g. LIRC) is
required to fetch the information from the hiddev interface.
The burden to reconstruct the data is moved into userspace (lirc through hiddev).
There is no need to set HID_QUIRK_HIDDEV quirk, as the device has also output
applications, which trigger the creation of hiddev device automatically.
Signed-off-by: Robert Schedel <r.schedel@yahoo.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Fix a panic, by changing
hidinput_mapping_quirks(,, unsigned long *bit,)
to
hidinput_mapping_quirks(,, unsigned long **bit,)
The `bit' in this function is an out parameter.
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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This removes ugly macros IS_* to distinguish devices that
need special handling in hid-input, and establish proper
quirks for them.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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BTC 8193 keyboard handles its scrollwheel in very non-standard way.
It produces two non-standard usages for scrolling up and down, in
both cases with postive value equaling to 1. We handle this by temporary
mapping, which we then catch in quirk event handler, and remap to
negative HWHEEL even in order to introduce correct behavior.
Also the button requires special mapping, as it triggers standard-violating
usage code.
Reported in kernel.org bugzilla #9385
Reported-by: Kir Kolyshkin <kir@sacred.ru>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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This patch separates also the hid-input quirks that have to be
applied at the time the event occurs, so that the generic code
handling HUT-compliant devices is not messed up by them too much.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Currently, the handling of mapping between hid and input for devices
that don't conform to HUT 1.12 specification is very messy -- no per-device
handling, no blacklists, conditions on idVendor and idProduct placed
all over the code.
This patch moves all the device-specific input mapping to a separate
file, and introduces a blacklist-style handling for non-standard
device-specific mappings.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Genius KB-29E has broken report descriptor, which causes some of the
Consumer usages to appear incorrectly as Button usages. We fix it by
fixing the report descriptor before it is being parsed.
Also a few of the keys violate the HUT standard, so they need a special
handling. They currently fall into "Reserved" range as per HUT 1.12.
Reported-by: Szekeres Istvan <szekeres@iii.hu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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This mouse distinguishes horizontal wheel from vertical by a special "pseudo
event" GenericDesktop.00b8, with values of 0 for vertical and 8 for horizontal
wheel. Because this event is supplied by the parser too late, we need to delay
a wheel event, wait for this one and send either REL_WHEEL or REL_HWHEEL to
input depending on the event value.
Signed-off-by: Pavel Troller <patrol@sinus.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Preserve identifiers exposed in build and run time configuration though in
order not to break existing configurations.
This is in preparation for adding support for Apple aluminum USB keyboards.
Signed-off-by: Michel Daenzer <michel@tungstengraphics.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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* pxa-plat: (53 commits)
[ARM] 4762/1: Basic support for Toradex Colibri module
[ARM] pxa: fix mci_init functions returning -1
[ARM] 4737/1: Refactor corgi_lcd to improve readability + bugfix
[ARM] 4747/1: pcm027: support for pcm990 baseboard for phyCORE-PXA270
[ARM] 4746/1: pcm027: network support for phyCORE-PXA270
[ARM] 4745/1: pcm027: default configuration
[ARM] 4744/1: pcm027: add support for phyCORE-PXA270 CPU module
[NET] smc91x: Make smc91x use IRQ resource trigger flags
[ARM] pxa: add default config for littleton
[ARM] pxa: add basic support for Littleton (PXA3xx Form Factor Platform)
[ARM] 4664/1: Add basic support for HTC Magician PDA phones
[ARM] 4649/1: Base support for pxa-based Toshiba e-series PDAs.
[ARM] pxa: skip registers saving/restoring if entering standby mode
[ARM] pxa: fix PXA27x resume
[ARM] pxa: Avoid fiddling with CKEN register on suspend
[ARM] pxa: Add PXA3 standby code hooked into the IRQ wake scheme
[ARM] pxa: Add zylonite MFP wakeup configurations
[ARM] pxa: program MFPs for low power mode when suspending
[ARM] pxa: make MFP configuration processor independent
[ARM] pxa: remove un-used pxa3xx_mfp_set_xxx() functions
...
Conflicts:
arch/arm/mach-pxa/ssp.c
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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* orion: (26 commits)
[ARM] Orion: implement power-off method for QNAP TS-109/209
[ARM] Orion: add support for QNAP TS-109/TS-209
[ARM] Orion: I2C support
[I2C] i2c-mv64xxx: Don't set i2c_adapter.retries
[I2C] Split mv643xx I2C platform support
[ARM] Orion: enable CONFIG_RTC_DRV_M41T80 for D-Link DNS-323
[ARM] Orion defconfig
[ARM] Orion: add support for Orion/MV88F5181 based D-Link DNS-323
[ARM] Orion: MV88F5181 support bits
[ARM] Orion: Buffalo/Revogear Kurobox Pro support
[ARM] OrionNAS RD board support
[ARM] Orion: support for Marvell Orion-2 (88F5281) Development Board
[ARM] Orion: common platform setup for Gigabit Ethernet port
[ARM] Orion: platform device registration for UART, USB and NAND
[ARM] Orion: system timer support
[ARM] Orion edge GPIO IRQ support
[ARM] Orion: IRQ support
[ARM] Orion: provide GPIO method for enabling hardware assisted blinking
[ARM] Orion: GPIO support
[ARM] Orion: programable address map support
...
Conflicts:
arch/arm/Kconfig
arch/arm/Makefile
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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* at91: (24 commits)
[ARM] 4615/4: sam926[13]ek buttons updated
[ARM] 4765/1: [AT91] AT91CAP9A-DK board support
[ARM] 4764/1: [AT91] AT91CAP9 core support
[ARM] 4738/1: at91sam9261: Remove udc pullup enabling in board initialisation
[ARM] 4761/1: [AT91] Board-support for NEW_LEDs
[ARM] 4760/1: [AT91] SPI CS0 errata on AT91RM9200
[ARM] 4759/1: [AT91] Buttons on CSB300
[ARM] 4758/1: [AT91] LEDs
[ARM] 4757/1: [AT91] UART initialization
[ARM] 4756/1: [AT91] Makefile cleanup
[ARM] 4755/1: [AT91] NAND update
[ARM] 4754/1: [AT91] SSC library support
[ARM] 4753/1: [AT91] Use DMA_BIT_MASK
[ARM] 4752/1: [AT91] RTT, RTC and WDT peripherals on SAM9
[ARM] 4751/1: [AT91] ISI peripheral on SAM9263
[ARM] 4750/1: [AT91] STN LCD displays on SAM9261
[ARM] 4734/1: at91sam9263ek: include IRQ for Ethernet PHY
[ARM] 4646/1: AT91: configurable HZ, default to 128
[ARM] 4688/1: at91: speed-up irq processing
[ARM] 4657/1: AT91: Header definition update
...
* ep93xx:
[ARM] 4671/1: ep93xx: remove obsolete gpio_line_* operations
[ARM] 4670/1: ep93xx: implement IRQT_BOTHEDGE gpio irq sense type
[ARM] 4669/1: ep93xx: simplify GPIO code and cleanups
[ARM] 4668/1: ep93xx: implement new GPIO API
* iop:
[ARM] 4770/1: GLAN Tank: correct physmap_flash_data width field
[ARM] 4732/1: GLAN Tank: register rtc-rs5c372 i2c device
[ARM] 4708/1: iop: update defconfigs for 2.6.24
* kprobes:
ARM kprobes: let's enable it
ARM kprobes: special hook for the kprobes breakpoint handler
ARM kprobes: prevent some functions involved with kprobes from being probed
ARM kprobes: don't let a single-stepped stmdb corrupt the exception stack
ARM kprobes: add the kprobes hook to the page fault handler
ARM kprobes: core code
ARM kprobes: instruction single-stepping support
* ks8695:
[ARM] 4603/1: KS8695: debugfs interface to view pin state
[ARM] 4601/1: KS8695: PCI support
* misc:
[ARM] remove duplicate includes
[ARM] CONFIG_DEBUG_STACK_USAGE
[ARM] 4689/1: small comment wrap fix
[ARM] 4687/1: Trivial arch/arm/kernel/entry-common.S comment fix
[ARM] 4666/1: ixp4xx: fix sparse warnings in include/asm-arm/arch-ixp4xx/io.h
[ARM] remove reference to non-existent MTD_OBSOLETE_CHIPS
[SERIAL] 21285: Report baud rate back via termios
[ARM] Remove pointless casts from void pointers,
[ARM] Misc minor interrupt handler cleanups
[ARM] Remove at91_lcdc.h
[ARM] ARRAY_SIZE() cleanup
[ARM] Update mach-types
* msm:
[ARM] msm: dma support for MSM7X00A
[ARM] msm: board file for MACH_HALIBUT (QCT MSM7200A)
[ARM] msm: irq and timer support for ARCH_MSM7X00A
[ARM] msm: core platform support for ARCH_MSM7X00A
* s3c2410: (33 commits)
[ARM] 4795/1: S3C244X: Add armclk and setparent call
[ARM] 4794/1: S3C24XX: Comonise S3C2440 and S3C2442 clock code
[ARM] 4793/1: S3C24XX: Add IRQ->GPIO pin mapping function
[ARM] 4792/1: S3C24XX: Remove warnings from debug-macro.S
[ARM] 4791/1: S3C2412: Make fclk a parent of msysclk
[ARM] 4790/1: S3C2412: Fix parent selection for msysclk.
[ARM] 4789/1: S3C2412: Add missing CLKDIVN register values
[ARM] 4788/1: S3C24XX: Fix paramet to s3c2410_dma_ctrl if S3C2410_DMAF_AUTOSTART used.
[ARM] 4787/1: S3C24XX: s3c2410_dma_request() should return the allocated channel number
[ARM] 4786/1: S3C2412: Add SPI FIFO controll constants
[ARM] 4785/1: S3C24XX: Add _SHIFT definitions for S3C2410_BANKCON registers
[ARM] 4784/1: S3C24XX: Fix GPIO restore glitches
[ARM] 4783/1: S3C24XX: Add s3c2410_gpio_getpull()
[ARM] 4782/1: S3C24XX: Define FIQ_START for any FIQ users
[ARM] 4781/1: S3C24XX: DMA suspend and resume support
[ARM] 4780/1: S3C2412: Allow for seperate DMA channels for TX and RX
[ARM] 4779/1: S3C2412: Add s3c2412_gpio_set_sleepcfg() call
[ARM] 4778/1: S3C2412: Add armclk and init from DVS state
[ARM] 4777/1: S3C24XX: Ensure clk_set_rate() checks the set_rate method for the clk
[ARM] 4775/1: s3c2410: fix compilation error if only s3c2442 cpu is selected
...
* sa1100:
[ARM] sa1100: add clock source support
* vfp:
[ARM] 4584/2: ARMv7: Add Advanced SIMD (NEON) extension support
[ARM] 4583/1: ARMv7: Add VFPv3 support
[ARM] 4582/2: Add support for the common VFP subarchitecture
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Add the reverse of s3c2410_gpio_getirq to convert
a IRQ number into a GPIO pin number.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Remove warnings left in include/asm-arm/arch-s3c2410/debug-macro.S
whilst these where being experimented with.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Add S3C2412_CLKDIVN_DVSEN and S3C2412_CLKDIVN_HALFHCLK definitions to
the S3C2412_CLKDIVN set.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Add control constants for the S3C2412 SPI unit FIFO.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Add definitions to allow easier decomposotion of the contents of
the S3C2410_BANKON registers
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Add the call s3c2410_gpio_getpull() to return the
current state of the pin's pull-up.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Ensure FIQ_START is defined to allow anyone to use FIQ code on
an S3C24XX based CPU.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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If an DMA channel was active at suspend, then ensure that
it is correctly reconfigured when the system resumes.
Note, the previous policy was for each driver to handle their
own reconfiguration on resume. The policy has been changed to
make the individual driver's job easier.
Signed-off-by: Ben Dooks <ben-linux@flfuf.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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The current S3C24XX DMA code does not allow for an peripheral
that has one channel for RX and another for TX.
This patch adds a per-cpu dma operation to select the transmit
or receive channel, and adds support to the S3C2412 for the
seperate DMA channels for TX and RX.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Add s3c2412_gpio_set_sleepcfg() to allow the setting of the sleep
configuration of the GPIO blocks.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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This patch fixes compilation error if only a machine with
s3c2442 cpu is selected but without s3c2440 cpu selected.
Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Acked-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Ensure that if the RTC IRQ is not selected for wake in the
base configuration, then the PWRCFG has the same value set
in it.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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S3C2412_GPESLPCON does not exist in the register
mappings, so remove it.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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The S3C2412 IIS engine differs from the previous
SoC in the range, so add a set of register definitions
in a seperate file for it.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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If the watchdog reset fails and we decided to take the jump
to zero approach, allow 50ms for the UARTS to drain the FIFOs
before calling into a bootloader that may flush the output.
Also reduece the waits and the timeout values as 5 seconds is
rather long.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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If the hard reset routine is using the watchdog, then
ensure that the clock for the watchdog has been enabled
before we try and issue a reset.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Add the S3C2412_PWRCFG values for the action taken on detecting that
the battery is flat.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Add S3C2412 register definitions.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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This patch adds support for Toradex' PXA27x based Colibri module.
It's kept as simple as possible to only provide basic functionality.
A default config is also included.
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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This patch refactors the code in corgi_lcd.c moving it to the board
specific corgi and spitz files where appropriate instead of the
existing ifdef mess which hinders readability.
Fix spitz_get_hsync_len() to call get_hsync_invperiod so pxafb can be
compiled as a module.
The confusing variables which represent the inverse horizintal sync
period are renamed to "invperiod" consistently.
An incorrect comment in corgi_ts.c is also corrected.
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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This patch adds baseboard support for the phyCORE-PXA270 development
kit (aka PCM-990).
This example shows how to use some phyCORE-PXA270 CPU module features
on a baseboard in a standard manner. It could be used as a starting
point for custom baseboard development.
V2:
After comments by Eric Miao:
- IRQ chained handler fixed
- video/graphic support moved to separate patch
- ifdef/endif hell reduced ;-)
V3:
After comments by Russell King
- initialise the mmci platform data statically
V4:
After comments by Russell King
- wrong return value in pcm990_mci_init() fixed
Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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This patch adds main support for the generic phyCORE-PXA270 CPU module
(aka PCM-027). Its as generic as possible to support any kind of baseboard.
Note: Neither the CPU module nor the pcm027.c implementation can work without
a baseboard support. Baseboard support can be added by the PCM-990 or any
custom variant.
V2:
After comments by Eric Miao:
- Currently unsupported devices moved into separate patch
- direct call of baseboard initialisation
V3:
After comments by Russell King
- sort include files
- setting RTC bit for power control removed
- style problems fixed (discovered by checkpatch.pl)
Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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This includes irda, gpio keys, pxafb, backlight, ohci and flash
(read-only).
Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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SCSI sg table allocation has a maximum size (of SCSI_MAX_SG_SEGMENTS,
currently 128) and this will cause a BUG_ON() in SCSI if something
tries an allocation over it. This patch adds a size limit to the
chaining allocator to allow the specification of the maximum
allocation size for chaining, so we always chain in units of the
maximum SCSI allocation size.
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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These DMA drain buffer implementations in drivers are pretty horrible
to do in terms of manipulating the scatterlist. Plus they're being
done at least in drivers/ide and drivers/ata, so we now have code
duplication.
The one use case for this, as I understand it is AHCI controllers doing
PIO mode to mmc devices but translating this to DMA at the controller
level.
So, what about adding a callback to the block layer that permits the
adding of the drain buffer for the problem devices. The idea is that
you'd do this in slave_configure after you find one of these devices.
The beauty of doing it in the block layer is that it quietly adds the
drain buffer to the end of the sg list, so it automatically gets mapped
(and unmapped) without anything unusual having to be done to the
scatterlist in driver/scsi or drivers/ata and without any alteration to
the transfer length.
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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syslets (or other threads/processes that want io context sharing) can
set this to enforce sharing of io context.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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The io context sharing introduced a per-ioc spinlock, that would protect
the cfq io context lookup. That is a regression from the original, since
we never needed any locking there because the ioc/cic were process private.
The cic lookup is changed from an rbtree construct to a radix tree, which
we can then use RCU to make the reader side lockless. That is the performance
critical path, modifying the radix tree is only done on process creation
(when that process first does IO, actually) and on process exit (if that
process has done IO).
As it so happens, radix trees are also much faster for this type of
lookup where the key is a pointer. It's a very sparse tree.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Detach task state from ioc, instead keep track of how many processes
are accessing the ioc.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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This is where it belongs and then it doesn't take up space for a
process that doesn't do IO.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Jens Axboe
Linus Torvalds
Robert Schedel
Fengguang Wu
Jiri Kosina
Pavel Troller
Michel Daenzer
Russell King
Ben Dooks
Krzysztof Helt
Daniel Mack
Richard Purdie
Robert Schwebel
eric miao
Philipp Zabel
James Bottomley