- May 28, 2012
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Paul Mackerras authored
This is much the same as for SPARC except that we can do the find_zero() function more efficiently using the count-leading-zeroes instructions. Tested on 32-bit and 64-bit PowerPC. Signed-off-by:
Paul Mackerras <paulus@samba.org> Acked-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Paul Mackerras authored
The aligned_byte_mask() definition is wrong for 32-bit big-endian machines: the "7-(n)" part of the definition assumes a long is 8 bytes. This fixes it by using BITS_PER_LONG - 8 instead of 8*7. Tested on 32-bit and 64-bit PowerPC. Signed-off-by:
Paul Mackerras <paulus@samba.org> Acked-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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- May 27, 2012
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Linus Torvalds authored
This makes <asm/word-at-a-time.h> actually live up to its promise of allowing architectures to help tune the string functions that do their work a word at a time. David had already taken the x86 strncpy_from_user() function, modified it to work on sparc, and then done the extra work to make it generically useful. This then expands on that work by making x86 use that generic version, completing the circle. But more importantly, it fixes up the word-at-a-time interfaces so that it's now easy to also support things like strnlen_user(), and pretty much most random string functions. David reports that it all works fine on sparc, and Jonas Bonn reported that an earlier version of this worked on OpenRISC too. It's pretty easy for architectures to add support for this and just replace their private versions with the generic code. * generic-string-functions: sparc: use the new generic strnlen_user() function x86: use the new generic strnlen_user() function lib: add generic strnlen_user() function word-at-a-time: make the interfaces truly generic x86: use generic strncpy_from_user routine
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git://git.pengutronix.de/git/wsa/linuxLinus Torvalds authored
Pull i2c-embedded changes from Wolfram Sang: "Major changes: - lots of devicetree additions for existing drivers. I tried hard to make sure the bindings are proper. In more complicated cases, I requested acks from people having more experience with them than me. That took a bit of extra time and also some time went into discussions with developers about what bindings are and what not. I have the feeling that the workflow with bindings should be improved to scale better. I will spend some more thought on this... - i2c-muxes are succesfully used meanwhile, so we dropped EXPERIMENTAL for them and renamed the drivers to a standard pattern to match the rest of the subsystem. They can also be used with devicetree now. - ixp2000 was removed since the whole platform goes away. - cleanups (strlcpy instead of strcpy, NULL instead of 0) - The rest is typical driver fixes I assume. All patches have been in linux-next at least since v3.4-rc6." Fixed up trivial conflict in arch/arm/mach-lpc32xx/common.c due to the same patch already having come in through the arm/soc trees, with additional patches on top of it. * 'i2c-embedded/for-next' of git://git.pengutronix.de/git/wsa/linux: (35 commits) i2c: davinci: Free requested IRQ in remove i2c: ocores: register OF i2c devices i2c: tegra: notify transfer-complete after clearing status. I2C: xiic: Add OF binding support i2c: Rename last mux driver to standard pattern i2c: tegra: fix 10bit address configuration i2c: muxes: rename first set of drivers to a standard pattern of/i2c: implement of_find_i2c_adapter_by_node i2c: implement i2c_verify_adapter i2c-s3c2410: Add HDMIPHY quirk for S3C2440 i2c-s3c2410: Rework device type handling i2c: muxes are not EXPERIMENTAL anymore i2c/of: Automatically populate i2c mux busses from device tree data. i2c: Add a struct device * parameter to i2c_add_mux_adapter() of/i2c: call i2c_verify_client from of_find_i2c_device_by_node i2c: designware: Add clk_{un}prepare() support i2c: designware: add PM support i2c: ixp2000: remove driver i2c: pnx: add device tree support i2c: imx: don't use strcpy but strlcpy ...
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull sweeping late_initcall cleanup for arm-soc from Olof Johansson: "This is a patch series from Shawn Guo that moves from individual late_initcalls() to using a member in the machine structure to invoke a platform's late initcalls. This cleanup is a step in the move towards multiplatform kernels since it would reduce the need to check for compatible platforms in each and every initcall." Fix up trivial conflicts in arch/arm/mach-{exynos/mach-universal_c210.c, imx/mach-cpuimx51.c, omap2/board-generic.c} due to changes nearby (and, in the case of cpuimx51.c the board support being deleted) * tag 'cleanup-initcall' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: ARM: ux500: use machine specific hook for late init ARM: tegra: use machine specific hook for late init ARM: shmobile: use machine specific hook for late init ARM: sa1100: use machine specific hook for late init ARM: s3c64xx: use machine specific hook for late init ARM: prima2: use machine specific hook for late init ARM: pnx4008: use machine specific hook for late init ARM: omap2: use machine specific hook for late init ARM: omap1: use machine specific hook for late init ARM: msm: use machine specific hook for late init ARM: imx: use machine specific hook for late init ARM: exynos: use machine specific hook for late init ARM: ep93xx: use machine specific hook for late init ARM: davinci: use machine specific hook for late init ARM: provide a late_initcall hook for platform initialization
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull arm-soc: soc specific changes (part 2) from Olof Johansson: "This adds support for the spear13xx platform, which has first been under review a long time ago and finally been completed after generic spear work has gone into the clock, dt and pinctrl branches. Also a number of updates for the samsung socs are part of this branch." Fix up trivial conflicts in drivers/gpio/gpio-samsung.c that look much worse than they are: the exonys5 init code was refactored in commit fd454997 ("gpio: samsung: refactor gpiolib init for exynos4/5"), and then commit f10590c9 ("ARM: EXYNOS: add GPC4 bank instance") added a new gpio chip define and did tiny updates to the init code. So the conflict diff looks like hell, but it's actually a fairly simple change. * tag 'soc2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (34 commits) ARM: exynos: fix building with CONFIG_OF disabled ARM: EXYNOS: Add AUXDATA for i2c controllers ARM: dts: Update device tree source files for EXYNOS5250 ARM: EXYNOS: Add device tree support for interrupt combiner ARM: EXYNOS: Add irq_domain support for interrupt combiner ARM: EXYNOS: Remove a new bus_type instance for EXYNOS5 ARM: EXYNOS: update irqs for EXYNOS5250 SoC ARM: EXYNOS: Add pre-divider and fout mux clocks for bpll and mpll ARM: EXYNOS: add GPC4 bank instance ARM: EXYNOS: Redefine IRQ_MCT_L0,1 definition ARM: EXYNOS: Modify the GIC physical address for static io-mapping ARM: EXYNOS: Add watchdog timer clock instance pinctrl: SPEAr1310: Fix pin numbers for clcd_high_res SPEAr: Update MAINTAINERS and Documentation SPEAr13xx: Add defconfig SPEAr13xx: Add compilation support SPEAr13xx: Add dts and dtsi files pinctrl: Add SPEAr13xx pinctrl drivers pinctrl: SPEAr: Create macro for declaring GPIO PINS SPEAr13xx: Add common clock framework support ...
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull arm-soc device tree conversions (part 2) from Olof Johansson: "These continue the device tree work from part 1, this set is for the tegra, mxs and imx platforms, all of which have dependencies on clock or pinctrl changes submitted earlier." Fix up trivial conflicts due to nearby changes in drivers/{gpio/gpio,i2c/busses/i2c}-mxs.c * tag 'dt2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (73 commits) ARM: dt: tegra: invert status=disable vs status=okay ARM: dt: tegra: consistent basic property ordering ARM: dt: tegra: sort nodes based on bus order ARM: dt: tegra: remove duplicate device_type property ARM: dt: tegra: consistenly use lower-case for hex constants ARM: dt: tegra: format regs properties consistently ARM: dt: tegra: gpio comment cleanup ARM: dt: tegra: remove unnecessary unit addresses ARM: dt: tegra: whitespace cleanup ARM: dt: tegra cardhu: fix typo in SDHCI node name ARM: dt: tegra: cardhu: register core regulator tps62361 ARM: dt: tegra30.dtsi: Add SMMU node ARM: dt: tegra20.dtsi: Add GART node ARM: dt: tegra30.dtsi: Add Memory Controller(MC) nodes ARM: dt: tegra20.dtsi: Add Memory Controller(MC) nodes ARM: dt: tegra: Add device tree support for AHB ARM: dts: enable audio support for imx28-evk ARM: dts: enable i2c device for imx28-evk i2c: mxs: add device tree probe support ARM: dts: enable mmc for imx28-evk ...
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull arm-soc stmp-dev library code from Olof Johansson: "A number of devices are using a common register layout, this adds support code for it in lib/stmp_device.c so we do not need to duplicate it in each driver." Fix up trivial conflicts in drivers/i2c/busses/i2c-mxs.c and lib/Makefile * tag 'stmp-dev' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: i2c: mxs: use global reset function lib: add support for stmp-style devices
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull arm-soc clock driver changes from Olof Johansson: "The new clock subsystem was merged in linux-3.4 without any users, this now moves the first three platforms over to it: imx, mxs and spear. The series also contains the changes for the clock subsystem itself, since Mike preferred to have it together with the platforms that require these changes, in order to avoid interdependencies and conflicts." Fix up trivial conflicts in arch/arm/mach-kirkwood/common.c (code removed in one branch, added OF support in another) and drivers/dma/imx-sdma.c (independent changes next to each other). * tag 'clock' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (97 commits) clk: Fix CLK_SET_RATE_GATE flag validation in clk_set_rate(). clk: Provide dummy clk_unregister() SPEAr: Update defconfigs SPEAr: Add SMI NOR partition info in dts files SPEAr: Switch to common clock framework SPEAr: Call clk_prepare() before calling clk_enable SPEAr: clk: Add General Purpose Timer Synthesizer clock SPEAr: clk: Add Fractional Synthesizer clock SPEAr: clk: Add Auxiliary Synthesizer clock SPEAr: clk: Add VCO-PLL Synthesizer clock SPEAr: Add DT bindings for SPEAr's timer ARM i.MX: remove now unused clock files ARM: i.MX6: implement clocks using common clock framework ARM i.MX35: implement clocks using common clock framework ARM i.MX5: implement clocks using common clock framework ARM: Kirkwood: Replace clock gating ARM: Orion: Audio: Add clk/clkdev support ARM: Orion: PCIE: Add support for clk ARM: Orion: XOR: Add support for clk ARM: Orion: CESA: Add support for clk ...
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull arm-soc cleanups (part 2) from Olof Johansson: "More cleanups, continuing an earlier set with omap and samsung specific cleanups. These could not go into the first set because they have dependencies on various other series that in turn depend on the first cleanups." Fixed up conflicts in arch/arm/plat-omap/counter_32k.c due to commit bd0493ea: "move read_{boot,persistent}_clock to the architecture level" that changed how the persistent clocks were handled. And trivial conflicts in arch/arm/mach-omap1/common.h due to just independent changes close to each other. * tag 'cleanup2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (35 commits) ARM: SAMSUNG: merge plat-s5p into plat-samsung ARM: SAMSUNG: move options for common s5p into plat-samsung/Kconfig ARM: SAMSUNG: move setup code for s5p mfc and mipiphy into plat-samsung ARM: SAMSUNG: move platform device for s5p uart into plat-samsung ARM: SAMSUNG: move hr timer for common s5p into plat-samsung ARM: SAMSUNG: move pm part for common s5p into plat-samsung ARM: SAMSUNG: move interrupt part for common s5p into plat-samsung ARM: SAMSUNG: move clock part for common s5p into plat-samsung ARM: S3C24XX: Use common macro to define resources on dev-uart.c ARM: S3C24XX: move common clock init into common.c ARM: S3C24XX: move common power-management code to mach-s3c24xx ARM: S3C24XX: move plat-s3c24xx/dev-uart.c into common.c ARM: S3C24XX: move plat-s3c24xx/cpu.c ARM: OMAP2+: Kconfig: convert SOC_OMAPAM33XX to SOC_AM33XX ARM: OMAP2+: Kconfig: convert SOC_OMAPTI81XX to SOC_TI81XX GPMC: add ECC control definitions ARM: OMAP2+: dmtimer: remove redundant sysconfig context restore ARM: OMAP: AM35xx: convert 3517 detection/flags to AM35xx ARM: OMAP: AM35xx: remove redunant cpu_is checks for AM3505 ARM: OMAP1: Pass dma request lines in platform data to MMC driver ...
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull arm-soc driver specific updates from Olof Johansson: "These changes are specific to some driver that may be used by multiple boards or socs. The most significant change in here is the move of the samsung iommu code from a platform specific in-kernel interface to the generic iommu subsystem." Fix up trivial conflicts in arch/arm/mach-exynos/Kconfig * tag 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (28 commits) mmc: dt: Consolidate DT bindings iommu/exynos: Add iommu driver for EXYNOS Platforms ARM: davinci: optimize the DMA ISR ARM: davinci: implement DEBUG_LL port choice ARM: tegra: Add SMMU enabler in AHB ARM: tegra: Add Tegra AHB driver Input: pxa27x_keypad add choice to set direct_key_mask Input: pxa27x_keypad direct key may be low active Input: pxa27x_keypad bug fix for direct_key_mask Input: pxa27x_keypad keep clock on as wakeup source ARM: dt: tegra: pinmux changes for USB ULPI ARM: tegra: add USB ULPI PHY reset GPIO to device tree ARM: tegra: don't hard-code USB ULPI PHY reset_gpio ARM: tegra: change pll_p_out4's rate to 24MHz ARM: tegra: fix pclk rate ARM: tegra: reparent sclk to pll_c_out1 ARM: tegra: Add pllc clock init table ARM: dt: tegra cardhu: basic audio support ARM: dt: tegra30.dtsi: Add audio-related nodes ARM: tegra: add AUXDATA required for audio ...
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull arm-soc defconfig updates from Olof Johansson: "For the first time, we have one branch that collects just updates to defconfig files, mostly for adapting to changes in other subsystems." * tag 'defconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: ARM: PRIMA2: add prima2_defconfig for CSR SiRFprimaII ARM: tegra: update defconfig ARM: tegra: update defconfig ARM: imx_v6_v7_defconfig: Add SPI NOR support ARM: imx_v4_v5_defconfig: Let CONFIG_MACH_IMX27_DT be built by default
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David Miller authored
This throws away the sparc-specific functions in favor of the generic optimized version. Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Linus Torvalds authored
This throws away the old x86-specific functions in favor of the generic optimized version. Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Linus Torvalds authored
This adds a new generic optimized strnlen_user() function that uses the <asm/word-at-a-time.h> infrastructure to portably do efficient string handling. In many ways, strnlen is much simpler than strncpy, and in particular we can always pre-align the words we load from memory. That means that all the worries about alignment etc are a non-issue, so this one can easily be used on any architecture. You obviously do have to do the appropriate word-at-a-time.h macros. Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Linus Torvalds authored
This changes the interfaces in <asm/word-at-a-time.h> to be a bit more complicated, but a lot more generic. In particular, it allows us to really do the operations efficiently on both little-endian and big-endian machines, pretty much regardless of machine details. For example, if you can rely on a fast population count instruction on your architecture, this will allow you to make your optimized <asm/word-at-a-time.h> file with that. NOTE! The "generic" version in include/asm-generic/word-at-a-time.h is not truly generic, it actually only works on big-endian. Why? Because on little-endian the generic algorithms are wasteful, since you can inevitably do better. The x86 implementation is an example of that. (The only truly non-generic part of the asm-generic implementation is the "find_zero()" function, and you could make a little-endian version of it. And if the Kbuild infrastructure allowed us to pick a particular header file, that would be lovely) The <asm/word-at-a-time.h> functions are as follows: - WORD_AT_A_TIME_CONSTANTS: specific constants that the algorithm uses. - has_zero(): take a word, and determine if it has a zero byte in it. It gets the word, the pointer to the constant pool, and a pointer to an intermediate "data" field it can set. This is the "quick-and-dirty" zero tester: it's what is run inside the hot loops. - "prep_zero_mask()": take the word, the data that has_zero() produced, and the constant pool, and generate an *exact* mask of which byte had the first zero. This is run directly *outside* the loop, and allows the "has_zero()" function to answer the "is there a zero byte" question without necessarily getting exactly *which* byte is the first one to contain a zero. If you do multiple byte lookups concurrently (eg "hash_name()", which looks for both NUL and '/' bytes), after you've done the prep_zero_mask() phase, the result of those can be or'ed together to get the "either or" case. - The result from "prep_zero_mask()" can then be fed into "find_zero()" (to find the byte offset of the first byte that was zero) or into "zero_bytemask()" (to find the bytemask of the bytes preceding the zero byte). The existence of zero_bytemask() is optional, and is not necessary for the normal string routines. But dentry name hashing needs it, so if you enable DENTRY_WORD_AT_A_TIME you need to expose it. This changes the generic strncpy_from_user() function and the dentry hashing functions to use these modified word-at-a-time interfaces. This gets us back to the optimized state of the x86 strncpy that we lost in the previous commit when moving over to the generic version. Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Linus Torvalds authored
The generic strncpy_from_user() is not really optimal, since it is designed to work on both little-endian and big-endian. And on little-endian you can simplify much of the logic to find the first zero byte, since little-endian arithmetic doesn't have to worry about the carry bit propagating into earlier bytes (only later bytes, which we don't care about). But I have patches to make the generic routines use the architecture- specific <asm/word-at-a-time.h> infrastructure, so that we can regain the little-endian optimizations. But before we do that, switch over to the generic routines to make the patches each do just one well-defined thing. Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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- May 26, 2012
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git://git.kernel.org/pub/scm/linux/kernel/git/ras/rasLinus Torvalds authored
Pull x86/mce merge window patches from Tony Luck: "Including two that make error_context() checks less sucky" * tag 'x86-mce-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras: x86/mce: Add instruction recovery signatures to mce-severity table x86/mce: Fix check for processor context when machine check was taken. MCE: Fix vm86 handling for 32bit mce handler x86/mce Add validation check before GHES error is recorded x86/mce: Avoid reading every machine check bank register twice.
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git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tileLinus Torvalds authored
Pull tile updates from Chris Metcalf: "These changes cover a range of new arch/tile features and optimizations. They've been through LKML review and on linux-next for a month or so. There's also one bug-fix that just missed 3.4, which I've marked for stable." Fixed up trivial conflict in arch/tile/Kconfig (new added tile Kconfig entries clashing with the generic timer/clockevents changes). * git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: tile: default to tilegx_defconfig for ARCH=tile tile: fix bug where fls(0) was not returning 0 arch/tile: mark TILEGX as not EXPERIMENTAL tile/mm/fault.c: Port OOM changes to handle_page_fault arch/tile: add descriptive text if the kernel reports a bad trap arch/tile: allow querying cpu module information from the hypervisor arch/tile: fix hardwall for tilegx and generalize for idn and ipi arch/tile: support multiple huge page sizes dynamically mm: add new arch_make_huge_pte() method for tile support arch/tile: support kexec() for tilegx arch/tile: support <asm/cachectl.h> header for cacheflush() syscall arch/tile: Allow tilegx to build with either 16K or 64K page size arch/tile: optimize get_user/put_user and friends arch/tile: support building big-endian kernel arch/tile: allow building Linux with transparent huge pages enabled arch/tile: use interrupt critical sections less
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David Woodhouse authored
Now we have four copies of this code, Linus "suggested" it was about time we stopped copying it and turned it into a helper. Signed-off-by:
David Woodhouse <David.Woodhouse@intel.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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David Woodhouse authored
Add device info into list before doing context mapping, because device info will be used by iommu_enable_dev_iotlb(). Without it, ATS won't get enabled as it should be. ATS, while a dubious decision from a security point of view, can be very important for performance. Signed-off-by:
Xudong Hao <xudong.hao@intel.com> Signed-off-by:
Xiantao Zhang <xiantao.zhang@intel.com> Acked-by:
Chris Wright <chrisw@sous-sol.org> Signed-off-by:
David Woodhouse <David.Woodhouse@intel.com> Cc: stable@kernel.org Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Chris Metcalf authored
There is no "ARCH=tile" (just like there is no "ARCH=x86") so we need to pick a default configuration, either tilepro or tilegx, when users specify ARCH=tile. We'll use tilegx, since that's our current chip. Reported-by:
Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
This is because __builtin_clz(0) returns 64 for the "undefined" case of 0, since the builtin just does a right-shift 32 and "clz" instruction. So, use the alpha approach of casting to u32 and using __builtin_clzll(). Cc: stable@vger.kernel.org Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
Also create a TILEPRO config setting to use for #ifdefs where it is cleaner to do so, and make the 64BIT setting depend directly on the setting of TILEGX. Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Kautuk Consul authored
Commit d065bd81 (mm: retry page fault when blocking on disk transfer) and commit 37b23e05 (x86,mm: make pagefault killable) The above commits introduced changes into the x86 pagefault handler for making the page fault handler retryable as well as killable. These changes reduce the mmap_sem hold time, which is crucial during OOM killer invocation. Port these changes to tile. Signed-off-by:
Kautuk Consul <consul.kautuk@gmail.com> [cmetcalf@tilera.com: initialize "flags" after "write" updated.] Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
If the kernel unexpectedly takes a bad trap, it's convenient to have it report the type of trap as part of the error. This gives customers a bit more context before they call up customer support. Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
This just adds a few more attributes to the information Linux can query from the hypervisor for the /sys/hypervisor/board/ directory, providing part, serial#, revision#, and description for cpu modules (as opposed to the board itself, or any mezzanine boards). Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
The hardwall drain code was not properly implemented for tilegx, just tilepro, so you couldn't reliably restart an application that made use of the udn. In addition, the code was only applicable to the udn (user dynamic network). On tilegx there is a second user network that is available (the "idn"), and there is support for having I/O shims deliver user-level interrupts to applications ("ipi") which functions in a very similar way to the inter-core permissions used for udn/idn. So this change also generalizes the code from supporting just the udn to supports udn/idn/ipi on tilegx. By default we now use /dev/hardwall/{udn,idn,ipi} with separate minor numbers for the three devices. Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
This change adds support for a new "super" bit in the PTE, using the new arch_make_huge_pte() method. The Tilera hypervisor sees the bit set at a given level of the page table and gangs together 4, 16, or 64 consecutive pages from that level of the hierarchy to create a larger TLB entry. One extra "super" page size can be specified at each of the three levels of the page table hierarchy on tilegx, using the "hugepagesz" argument on the boot command line. A new hypervisor API is added to allow Linux to tell the hypervisor how many PTEs to gang together at each level of the page table. To allow pre-allocating huge pages larger than the buddy allocator can handle, this change modifies the Tilera bootmem support to put all of memory on tilegx platforms into bootmem. As part of this change I eliminate the vestigial CONFIG_HIGHPTE support, which never worked anyway, and eliminate the hv_page_size() API in favor of the standard vma_kernel_pagesize() API. Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
The tile support for multiple-size huge pages requires tagging the hugetlb PTE with a "super" bit for PTEs that are multiples of the basic size of a pagetable span. To set that bit properly we need to tweak the PTe in make_huge_pte() based on the vma. This change provides the API for a subsequent tile-specific change to use. Reviewed-by:
Hillf Danton <dhillf@gmail.com> Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
We already had a syscall that did some dcache flushing, but it was not used in practice. Make it MIPS compatible instead so it can do both the DCACHE and ICACHE actions. We have code that wants to be able to use the ICACHE flush mode from userspace so this change enables that. Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
This change introduces new flags for the hv_install_context() API that passes a page table pointer to the hypervisor. Clients can explicitly request 4K, 16K, or 64K small pages when they install a new context. In practice, the page size is fixed at kernel compile time and the same size is always requested every time a new page table is installed. The <hv/hypervisor.h> header changes so that it provides more abstract macros for managing "page" things like PFNs and page tables. For example there is now a HV_DEFAULT_PAGE_SIZE_SMALL instead of the old HV_PAGE_SIZE_SMALL. The various PFN routines have been eliminated and only PA- or PTFN-based ones remain (since PTFNs are always expressed in fixed 2KB "page" size). The page-table management macros are renamed with a leading underscore and take page-size arguments with the presumption that clients will use those macros in some single place to provide the "real" macros they will use themselves. I happened to notice the old hv_set_caching() API was totally broken (it assumed 4KB pages) so I changed it so it would nominally work correctly with other page sizes. Tag modules with the page size so you can't load a module built with a conflicting page size. (And add a test for SMP while we're at it.) Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
Use direct load/store for the get_user/put_user. Previously, we would call out to a helper routine that would do the appropriate thing and then return, handling the possible exception internally. Now we inline the load or store, along with a "we succeeded" indication in a register; if the load or store faults, we write a "we failed" indication into the same register and then return to the following instruction. This is more efficient and gives us more compact code, as well as being more in line with what other architectures do. The special futex assembly source file for TILE-Gx also disappears in this change; we just use the same inlining idiom there as well, putting the appropriate atomic operations directly into futex_atomic_op_inuser() (and thus into the FUTEX_WAIT function). The underlying atomic copy_from_user, copy_to_user functions were renamed using the (cryptic) x86 convention as copy_from_user_ll and copy_to_user_ll. Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
The toolchain supports big-endian mode now, so add support for building the kernel to run big-endian as well. Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
The change adds some infrastructure for managing tile pmd's more generally, using pte_pmd() and pmd_pte() methods to translate pmd values to and from ptes, since on TILEPro a pmd is really just a nested structure holding a pgd (aka pte). Several existing pmd methods are moved into this framework, and a whole raft of additional pmd accessors are defined that are used by the transparent hugepage framework. The tile PTE now has a "client2" bit. The bit is used to indicate a transparent huge page is in the process of being split into subpages. This change also fixes a generic bug where the return value of the generic pmdp_splitting_flush() was incorrect. Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf authored
In general we want to avoid ever touching memory while within an interrupt critical section, since the page fault path goes through a different path from the hypervisor when in an interrupt critical section, and we carefully decided with tilegx that we didn't need to support this path in the kernel. (On tilepro we did implement that path as part of supporting atomic instructions in software.) In practice we always need to touch the kernel stack, since that's where we store the interrupt state before releasing the critical section, but this change cleans up a few things. The IRQ_ENABLE macro is split up so that when we want to enable interrupts in a deferred way (e.g. for cpu_idle or for interrupt return) we can read the per-cpu enable mask before entering the critical section. The cache-migration code is changed to use interrupt masking instead of interrupt critical sections. And, the interrupt-entry code is changed so that we defer loading "tp" from per-cpu data until after we have released the interrupt critical section. Signed-off-by:
Chris Metcalf <cmetcalf@tilera.com>
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git://git.linaro.org/people/sumitsemwal/linux-dma-bufLinus Torvalds authored
Pull dma-buf updates from Sumit Semwal: "Here's the first signed-tag pull request for dma-buf framework. It includes the following key items: - mmap support - vmap support - related documentation updates These are needed by various drivers to allow mmap/vmap of dma-buf shared buffers. Dave Airlie has some prime patches dependent on the vmap pull as well." * tag 'tag-for-linus-3.5' of git://git.linaro.org/people/sumitsemwal/linux-dma-buf: dma-buf: add initial vmap documentation dma-buf: minor documentation fixes. dma-buf: add vmap interface dma-buf: mmap support
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git://git.infradead.org/users/vkoul/slave-dmaLinus Torvalds authored
Pull slave-dmaengine updates from Vinod Koul: "Nothing exciting this time, odd fixes in a bunch of drivers" * 'next' of git://git.infradead.org/users/vkoul/slave-dma: dmaengine: at_hdmac: take maxburst from slave configuration dmaengine: at_hdmac: remove ATC_DEFAULT_CTRLA constant dmaengine: at_hdmac: remove some at_dma_slave comments dma: imx-sdma: make channel0 operations atomic dmaengine: Fixup dmaengine_prep_slave_single() to be actually useful dmaengine: Use dma_sg_len(sg) instead of sg->length dmaengine: Use sg_dma_address instead of sg_phys DMA: PL330: Remove duplicate header file inclusion dma: imx-sdma: keep the callbacks invoked in the tasklet dmaengine: dw_dma: add Device Tree probing capability dmaengine: dw_dmac: Add clk_{un}prepare() support dma/amba-pl08x: add support for the Nomadik variant dma/amba-pl08x: check for terminal count status only
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git://git.linaro.org/people/mszyprowski/linux-dma-mappingLinus Torvalds authored
Pull CMA and ARM DMA-mapping updates from Marek Szyprowski: "These patches contain two major updates for DMA mapping subsystem (mainly for ARM architecture). First one is Contiguous Memory Allocator (CMA) which makes it possible for device drivers to allocate big contiguous chunks of memory after the system has booted. The main difference from the similar frameworks is the fact that CMA allows to transparently reuse the memory region reserved for the big chunk allocation as a system memory, so no memory is wasted when no big chunk is allocated. Once the alloc request is issued, the framework migrates system pages to create space for the required big chunk of physically contiguous memory. For more information one can refer to nice LWN articles: - 'A reworked contiguous memory allocator': http://lwn.net/Articles/447405/ - 'CMA and ARM': http://lwn.net/Articles/450286/ - 'A deep dive into CMA': http://lwn.net/Articles/486301/ - and the following thread with the patches and links to all previous versions: https://lkml.org/lkml/2012/4/3/204 The main client for this new framework is ARM DMA-mapping subsystem. The second part provides a complete redesign in ARM DMA-mapping subsystem. The core implementation has been changed to use common struct dma_map_ops based infrastructure with the recent updates for new dma attributes merged in v3.4-rc2. This allows to use more than one implementation of dma-mapping calls and change/select them on the struct device basis. The first client of this new infractructure is dmabounce implementation which has been completely cut out of the core, common code. The last patch of this redesign update introduces a new, experimental implementation of dma-mapping calls on top of generic IOMMU framework. This lets ARM sub-platform to transparently use IOMMU for DMA-mapping calls if one provides required IOMMU hardware. For more information please refer to the following thread: http://www.spinics.net/lists/arm-kernel/msg175729.html The last patch merges changes from both updates and provides a resolution for the conflicts which cannot be avoided when patches have been applied on the same files (mainly arch/arm/mm/dma-mapping.c)." Acked by Andrew Morton <akpm@linux-foundation.org>: "Yup, this one please. It's had much work, plenty of review and I think even Russell is happy with it." * 'for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping: (28 commits) ARM: dma-mapping: use PMD size for section unmap cma: fix migration mode ARM: integrate CMA with DMA-mapping subsystem X86: integrate CMA with DMA-mapping subsystem drivers: add Contiguous Memory Allocator mm: trigger page reclaim in alloc_contig_range() to stabilise watermarks mm: extract reclaim code from __alloc_pages_direct_reclaim() mm: Serialize access to min_free_kbytes mm: page_isolation: MIGRATE_CMA isolation functions added mm: mmzone: MIGRATE_CMA migration type added mm: page_alloc: change fallbacks array handling mm: page_alloc: introduce alloc_contig_range() mm: compaction: export some of the functions mm: compaction: introduce isolate_freepages_range() mm: compaction: introduce map_pages() mm: compaction: introduce isolate_migratepages_range() mm: page_alloc: remove trailing whitespace ARM: dma-mapping: add support for IOMMU mapper ARM: dma-mapping: use alloc, mmap, free from dma_ops ARM: dma-mapping: remove redundant code and do the cleanup ... Conflicts: arch/x86/include/asm/dma-mapping.h
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