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[PATCH --mmotm v7 0/3] Make fault injection available for MMC IO

by Per Forlin

change log: v2 - Resolve build issue in mmc core.c due to multiple init_module by removing the fault inject module. - Export fault injection functions to make them available for modules - Update fault injection documentation on MMC IO v3 - add function descriptions in core.c - use export GPL for fault injection functions v4 - make the fault_attr per host. This prepares for upcoming patch from Akinobu that adds support for creating debugfs entries in arbitrary directory. v5 - Make use of fault_create_debugfs_attr() in Akinobu's patch "fault-injection: add ability to export fault_attr in...". v6 - Fix typo in commit message in patch "export fault injection functions" v7 - Don't compile in boot param setup function if mmc-core is built as module. Per Forlin (3): fault-inject: export fault injection functions mmc: core: add random fault injection fault injection: add documentation on MMC IO fault injection Documentation/fault-injection/fault-injection.txt | 5 ++ drivers/mmc/core/core.c | 44 +++++++++++++++++++++ drivers/mmc/core/debugfs.c | 27 +++++++++++++ include/linux/mmc/host.h | 7 +++ lib/Kconfig.debug | 11 +++++ lib/fault-inject.c | 2 + 6 files changed, 96 insertions(+), 0 deletions(-) -- 1.7.4.1

14 years, 1 month

[PATCH --mmotm v5 0/3] Make fault injection available for MMC IO

by Per Forlin

This patchset is sent to the mm-tree because it depends on Akinobu's patch "fault-injection: add ability to export fault_attr in..." change log: v2 - Resolve build issue in mmc core.c due to multiple init_module by removing the fault inject module. - Export fault injection functions to make them available for modules - Update fault injection documentation on MMC IO v3 - add function descriptions in core.c - use export GPL for fault injection functions v4 - make the fault_attr per host. This prepares for upcoming patch from Akinobu that adds support for creating debugfs entries in arbitrary directory. v5 - Make use of fault_create_debugfs_attr() in Akinobu's patch "fault-injection: add ability to export fault_attr in...". Per Forlin (3): fault-inject: export fault injection functions mmc: core: add random fault injection fault injection: add documentation on MMC IO fault injection Documentation/fault-injection/fault-injection.txt | 5 ++ drivers/mmc/core/core.c | 44 +++++++++++++++++++++ drivers/mmc/core/debugfs.c | 24 +++++++++++ include/linux/mmc/host.h | 7 +++ lib/Kconfig.debug | 11 +++++ lib/fault-inject.c | 2 + 6 files changed, 93 insertions(+), 0 deletions(-) -- 1.7.4.1

14 years, 1 month

[PATCH --mmotm v6 0/3] Make fault injection available for MMC IO

by Per Forlin

change log: v2 - Resolve build issue in mmc core.c due to multiple init_module by removing the fault inject module. - Export fault injection functions to make them available for modules - Update fault injection documentation on MMC IO v3 - add function descriptions in core.c - use export GPL for fault injection functions v4 - make the fault_attr per host. This prepares for upcoming patch from Akinobu that adds support for creating debugfs entries in arbitrary directory. v5 - Make use of fault_create_debugfs_attr() in Akinobu's patch "fault-injection: add ability to export fault_attr in...". v6 - Fix typo in commit message in patch "export fault injection functions" Per Forlin (3): fault-inject: export fault injection functions mmc: core: add random fault injection fault injection: add documentation on MMC IO fault injection Documentation/fault-injection/fault-injection.txt | 5 ++ drivers/mmc/core/core.c | 44 +++++++++++++++++++++ drivers/mmc/core/debugfs.c | 24 +++++++++++ include/linux/mmc/host.h | 7 +++ lib/Kconfig.debug | 11 +++++ lib/fault-inject.c | 2 + 6 files changed, 93 insertions(+), 0 deletions(-) -- 1.7.4.1

14 years, 1 month

RE: DA9053 LKML work

by Ashish Jangam

Hi Paul, Attached are the DA9052 LKML patches for:- MFD Regulator Backlight LED GPIO Onkey HWMON RTC Above Patches are ACK by LKML but yet to be merged in Linux.org. Battery, TSI and SM are yet to be ACK therefore not included in this attachment. In case of any problem with these patches do let me know. Regards, Ashish > -----Original Message----- > From: Ying-Chun Liu (PaulLiu) [mailto:paul.liu@linaro.org] > Sent: Monday, August 08, 2011 3:51 PM > To: Ashish Jangam > Subject: Re: DA9053 LKML work > > Hi Ashish, > > Do you have all of the latest link of your DA9052 driver on LKML? > It is because I cannot find newer version of TSI driver. > https://lkml.org/lkml/2011/4/13/112 > > In your last mail > > 8 patches got accepted only remains are battery, tsi and watchdog > hopefully > > They should get through by July end. > > What do you mean get accepted? > Do you have an external git tree maintaining the patches?? > > Yours Sincerely, > Paul Liu

14 years, 1 month

Re: Creatings automated tests on Android

by Amit Kucheria

Thanks for the info Yong. I'll look into monkeyrunner and Robotium. Cheers, Amit On Mon, Aug 8, 2011 at 5:35 PM, yong qin <yongqin.liu(a)linaro.org> wrote: > Hi, Amit Kucheria > In my opinion, there are serval ways to do that. > > 1. use monkey to run the specified apps randomly. > http://developer.android.com/guide/developing/tools/monkey.html > > 2. use monkeyrunner to simulate the operation of user > > http://developer.android.com/guide/developing/tools/monkeyrunner_concepts.h… > > 3. use instrumentation to simulate the operation of user. like Robotium. > http://developer.android.com/guide/topics/testing/testing_android.html > > 4. use record and replay to. > 1) record the events user done on andoid gui to a file > 2) replay user's operation with the recorded file. > but this needs > a) the apps will not be changed often > b) the screen size of andoid should be fixed. > if the screen size was changed, it need to record again. > > On 8 August 2011 20:38, Amit Kucheria <amit.kucheria(a)linaro.org> wrote: >> >> Hi, >> >> In the PMWG, we'd like to to be able to run some apps and measure the >> power consumption while they run. Since the power measurement >> framework currently supports Android, does anybody know of automated >> ways to reproduce a test case? >> >> I found Robotium[1] on googling and would like to know if it is >> something we could standardize around. >> >> Regards, >> Amit >> >> [1] http://code.google.com/p/robotium/ >>

14 years, 1 month

Single zImage at Linaro Connect

by Nicolas Pitre

To everyone, and especially to those who are expected to work on this topic next week, please find below a list of tasks that needs to be investigated and/or accomplished. I'll coordinate the work and collect patches for the team. If you have comments on this, or if you know about some omissions, please feel free to provide them as a reply to this message. I'd like to know if people are particularly interested in one (or more :-)) items they would like to work on. If so please say so as well. Without further ado, here it is: <><><><><> 0) The so called "single zImage" project We wish to provide the ability to build as many ARM platforms as possible into a single kernel binary image. This will greatly simplify the archive packaging and maintenance effort by having only one kernel that could be built and booted on multiple ARM targets. A side effect of this is also to enforce better source code architecture even if the resulting binaries are not always supporting multiple targets. This work started a while ago. Some initial description can be found here: https://wiki.ubuntu.com/Specs/ARMSingleKernel Part of it has been implemented already, namely the runtime determined PHYS_OFFSET, the AUTO_ZRELADDR and some other items referenced below. But there is still a large amount of work remaining. 1) Removal of any dependencies on <mach/*.h> from generic header files To see the current culprits: $ git grep "#include <mach/.*.h>" arch/arm/include/ arch/arm/include/asm/clkdev.h:#include <mach/clkdev.h> arch/arm/include/asm/dma.h:#include <mach/isa-dma.h> arch/arm/include/asm/floppy.h:#include <mach/floppy.h> arch/arm/include/asm/gpio.h:#include <mach/gpio.h> arch/arm/include/asm/hardware/dec21285.h:#include <mach/hardware.h> arch/arm/include/asm/hardware/iop3xx-adma.h:#include <mach/hardware.h> arch/arm/include/asm/hardware/iop3xx-gpio.h:#include <mach/hardware.h> arch/arm/include/asm/hardware/sa1111.h:#include <mach/bitfield.h> arch/arm/include/asm/io.h:#include <mach/io.h> arch/arm/include/asm/irq.h:#include <mach/irqs.h> arch/arm/include/asm/mc146818rtc.h:#include <mach/irqs.h> arch/arm/include/asm/memory.h:#include <mach/memory.h> arch/arm/include/asm/mtd-xip.h:#include <mach/mtd-xip.h> arch/arm/include/asm/pci.h:#include <mach/hardware.h> /* for PCIBIOS_MIN_* */ arch/arm/include/asm/pgtable.h:#include <mach/vmalloc.h> arch/arm/include/asm/system.h:#include <mach/barriers.h> arch/arm/include/asm/timex.h:#include <mach/timex.h> arch/arm/include/asm/vga.h:#include <mach/hardware.h> 1.1) mach/memory.h This may contain the following defines: 1.1.1) ARM_DMA_ZONE_SIZE This can be eliminated by moving that value into struct machine_desc. The work is done already, but presented as an example for other tasks: http://git.linaro.org/gitweb?p=people/nico/linux.git;a=shortlog;h=refs/head… And as of now this is merged in mainline already for v3.1-rc1. 1.1.2) PLAT_PHYS_OFFSET Most occurrences can be eliminated. With CONFIG_ARM_PATCH_PHYS_VIRT, it is possible to determine PHYS_OFFSET at run time. Remains to remove the direct uses, mostly by mdesc->boot_params initializers. Changing boot_params into atag_offset has two effects: that makes it clearer that it is only about ATAGs and not DT, and a relative offset plays more nicely with a runtime determined PHYS_OFFSET. This work is done but not yet accepted: http://news.gmane.org/group/gmane.linux.ports.arm.kernel/thread=123480 1.1.3) FLUSH_BASE, FLUSH_BASE_PHYS, FLUSH_BASE_MINICACHE, UNCACHEABLE_ADDR Those are StrongARM related constants, and different for each variants. Fixing this involves making the virtual addresses constant for all variants, and hiding the differences in the physical addresses during the actual mapping. The solution is here: http://news.gmane.org/group/gmane.linux.ports.arm.kernel/thread=123477/forc… 1.1.4) CONSISTENT_DMA_SIZE Maybe the CMA work will make this obsolete and the consistent DMA area could be dynamically adjusted. In the mean time, the easiest solution is probably to store this in the machine_desc structure just like with ARM_DMA_ZONE_SIZE. This has not been addressed yet. 1.1.5) Other weird things Some machines have non linear memory maps or bus address translations, sparsemem, etc. Examples of that are: arch/arm/mach-realview/include/mach/memory.h arch/arm/mach-integrator/include/mach/memory.h I think solving this is out of scope for this round. Deleting arch/arm/mach-*/include/mach/memory.h can't be done universally. So a new Kconfig symbol (NO_MACH_MEMORY_H) is introduced to indicate which machine class has its legacy <mach/memory.h> file removed. The single zImage for multiple targets will be restricted, amongst other things, to those machines or SOCs with that symbol selected. Partial result here: http://git.linaro.org/gitweb?p=people/nico/linux.git;a=shortlog;h=refs/head… 1.2) mach/io.h This contains things like IO_SPACE_LIMIT, __io(), __mem_pci(), and sometimes __arch_ioremap()/__arch_unmap(). but in most cases, the definitions here are pretty similar from one machine class to another. Arnd says: |I have a plan. When CONFIG_PCI is disabled (along with CONFIG_ISA and |CONFIG_PCMCIA), we should have neither of IO_SPACE_LIMIT, __io() |and get no inb/outb functions as a result. | |When it is enabled, the 'common' platforms need only one I/O window |of 64KB, so we should find a common place in the virtual address space |for that and hardcode __io, while the platform specific PCI initialization |code (or map_io for that matter) ensures that the window is pointing |to the physical window. | |__arch_ioremap()/__arch_unmap() are not really needed as far as I can |tell but are used as an optimization to redirect ioremap to the |hardcoded virtal address mapping. In the first step we can disable |this for combined kernels, later we can find a generic way so |__arch_ioremap walks the list of static mappings. 1.3) mach/timex.h Most instances simply define a dummy CLOCK_TICK_RATE value. This can probably be removed altogether, or simply have a common value in arch/arm/include/asm/timex.h, as nothing seriously uses that anymore. Reference: http://lkml.org/lkml/2011/2/21/323 1.4) mach/vmalloc.h This universally contains only a definition for VMALLOC_END, but not an universal definition. Would be nice to have VMALLOC_eND dynamically determined from the static IO mappings, but the highmem threshold depends on the value of VMALLOC_END, and memory has to be initialized before the static IO mappings can be processed. Therefore the best solution so far appears to use another value in struct machine_desc for it so it can be set at run time. this is a mechanical conversion that has to be done. 1.5) mach/irqs.h The only information globally required from those files is the value of NR_IRQS. Yet there is already a nr_irqs member in the machine_desc structure for this, used by arch_probe_nr_irqs() in arch/arm/kernel/irq.c). So the first step would be to add .nr_irqs = NR_IRQS, to all machine_desc instances, making sure that <mach/irqs.h> is included in those files. Then, <mach/irqs.h> should be removed from arch/arm/include/asm/irq.h, and adjust things so everything still compiles. 1.6) mach/gpio.h This is a tough one. This depends on CONFIG_GENERIC_GPIO which is selected by many machine types. They should all be converted to (or configurable with) CONFIG_GPIOLIB so each SOC's specific GPIO handling is made into runtime code instead of static inline functions. Care to preserve the ability to not use gpiolib might be desireable in some cases for performance reasons. Definitely in need of serious investigation. 1.7) mach/mtd-xip.h No need to care about those. This is for running the kernel XIP from ROM memory. A XIP kernel is already incompatible with the notion of a single kernel image since it obviously can't be modified at run time (as needed by CONFIG_ARM_PATCH_PHYS_VIRT). 1.8) mach/isa-dma.h, mach/floppy.h Those are used by old targets we might not care much about. 1.9) mach/entry-macro.S This one gets included directly from arch/arm/kernel/entry-armv.S. The only relevant macro still widely used is get_irqnr_preamble and get_irqnr_and_base. They can be overridden by CONFIG_MULTI_IRQ_HANDLER and the equivalent code hooked to the handle_irq member of the machine_desc structure. 1.10) mach/debug-macro.S This is used when CONFIG_DEBUG_LL is set. Supporting that option with a single kernel image might prove very difficult with a rapidly diminishing return on the investment. This code is in need of some refactoring already: http://article.gmane.org/gmane.linux.ports.arm.kernel/118525 To still benefit from the most likely needed debugging aid, we might consider the ability to still allow the selection of one amongst the existing implementation when building a kernel with many SOC support. Obviously that would only work on the one hardware platform for which the selected printch implementation was designed, but that should be good enough for debugging purposes. 1.11) mach/system.h This is included from arch/arm/kernel/process.c and expected to provide the following static inline functions or equivalent: 1.11.1) arch_idle() Called when system is idle. Most of them just call cpu_do_idle(). The call to cpu_do_idle() should be moved to default_idle() and the exception cases moved out of line where they can be hooked to the pm_idle callback. 1.11.2) arch_reset() Used to reset the system. This is far from being a hot path and doesn't justify a static inline function. An out-of-line version hooked to a global arch_reset function pointer would work just fine. 1.12) mach/uncompress.h This is used to define per SOC methods to output some progress feedback from the kernel decompressor over a serial port. Once again, supporting this with a single kernel image might prove very difficult with a rapidly diminishing return on the investment. So it is probably best to simply use generic empty stubs whenever more than one SOC family is configured in a common kernel image. 2) Removal of any dependencies on <mach/*.h> from driver code A couple possibilities: a) We move the required header files next to the driver code. In many cases, having a .h file with only the defines relevant to the concerned driver is best. But this is a _lot_ of work. b) We change those <mach/foo.h> into something more absolute, such as <mach/omap2/foo.h>. This can be done on a per SOC basis, first by moving the header files one level deeper, and then fixing up all affected drivers. c) We change those <mach/foo.h> files into something more precise, e.g. <mach/omap2_foo.h> and fix concerned drivers. I think the best solution here is (b) which doesn't preclude (a) eventually or if it is trivial. But (c) is dangerous as files might be added easily without paying too much attention to the file prefix. 3) Change thes to the build system We need to move towards the ability to actually build more than one SOC family at the same time. 3.1) Kconfig This involves changes to Kconfig where currently only one out of all the different architectures is selected through the big "ARM system type" choice prompt. We need to determine a good way to move some of them into simply bool prompts and keep track of which architecture can be built concurrently with which. We know for instance that it is unlikely that pre-ARMv6 and ARMv6/7 will ever be buildable together. Today we know that nothing can be built with anything else and therefore this should be the starting default. This needs investigating. 3.2) Makefile Currently the arch/arm/Makefile is organized so the lowest instruction set level and the highest optimization level are selected from all the configured options. So this part should already be fine. However the machine-$(*), plat-$(*), machdirs and platdirs variables must go. In (2) above we should have removed the need for adding to the global KBUILD_CPPFLAGS to add a path to some specific architecture includes already. Keeping them only for the code under each architecture subdirectory should be sufficient. For example, this might be all that is needed: obj-$(CONFIG_ARCH_MSM) += mach-msm/ or obj-$(CONFIG_ARCH_KIRKWOOD) += mach-kirkwood/ plat-orion/ obj-$(CONFIG_ARCH_ORION5X) += mach-orion5x/ plat-orion/ Etc. And within each of these directories, using the subdir-ccflags-y variable to include the locally needed architecture specific include files will do the trick. 3.3) defconfig We need a defconfig file adding as many architectures to it as possible for build coverage. Ideally the resulting binary should be boot tested on as many targets it supports as possible. 4) Picking up broken pieces Things will certainly break along the way. There are certainly issues that I didn't foresee. My experience so far tend to indicate that this is a somewhat recursive process where the tackling of one work item reveals a few more which are prerequisite to the first one, etc. So any estimate for this work needs to consider a large fudge factor. Nicolas

14 years, 1 month

[PATCH] usb: gadget: storage_common: make FSG_NUM_BUFFERS variable size

by Per Forlin

FSG_NUM_BUFFERS is set to 2 as default. Usually 2 buffers are enough to establish a good double buffering pipeline. But when dealing with expensive request preparation (i.e. dma_map) there may be benefits of increasing the number of buffers. There is an extra cost for every first request, the others are prepared in parallell with an ongoing transfer. Every time all buffers are consumed there is an additional cost for the next first request. Increasing the number of buffers decreases the risk of running out of buffers. Test set up * Running dd on the host reading from the mass storage device * cmdline: dd if=/dev/sdb of=/dev/null bs=4k count=$((256*100)) * Caches are dropped on the host and on the device before each run Measurements on a Snowball board with ondemand_govenor active. FSG_NUM_BUFFERS 2 104857600 bytes (105 MB) copied, 5.62173 s, 18.7 MB/s 104857600 bytes (105 MB) copied, 5.61811 s, 18.7 MB/s 104857600 bytes (105 MB) copied, 5.57817 s, 18.8 MB/s 104857600 bytes (105 MB) copied, 5.57769 s, 18.8 MB/s 104857600 bytes (105 MB) copied, 5.59654 s, 18.7 MB/s 104857600 bytes (105 MB) copied, 5.58948 s, 18.8 MB/s FSG_NUM_BUFFERS 4 104857600 bytes (105 MB) copied, 5.26839 s, 19.9 MB/s 104857600 bytes (105 MB) copied, 5.2691 s, 19.9 MB/s 104857600 bytes (105 MB) copied, 5.2711 s, 19.9 MB/s 104857600 bytes (105 MB) copied, 5.27174 s, 19.9 MB/s 104857600 bytes (105 MB) copied, 5.27261 s, 19.9 MB/s 104857600 bytes (105 MB) copied, 5.27135 s, 19.9 MB/s 104857600 bytes (105 MB) copied, 5.27249 s, 19.9 MB/s There may not be one optimal number for all boards. That is the reason for adding the number to Kconfig, Signed-off-by: Per Forlin <per.forlin(a)linaro.org> --- drivers/usb/gadget/Kconfig | 15 +++++++++++++++ drivers/usb/gadget/storage_common.c | 4 ++-- 2 files changed, 17 insertions(+), 2 deletions(-) diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig index 029e288..bbd17f3 100644 --- a/drivers/usb/gadget/Kconfig +++ b/drivers/usb/gadget/Kconfig @@ -96,6 +96,21 @@ config USB_GADGET_VBUS_DRAW This value will be used except for system-specific gadget drivers that have more specific information. +config USB_GADGET_STORAGE_NUM_BUFFERS + int "Number of storage pipline buffers" + range 2 64 + default 2 + help + Usually 2 buffers are enough to establish a good + double buffering pipeline. But when dealing with expensive + request preparation (i.e. dma_map) there may be benefits of + increasing the number of buffers. There is an extra cost for + every first request, the others are prepared in parallell with + an ongoing transfer. Every time all buffers are consumed there is + an additional cost for the next first request. Increasing the number + of buffers decreases the risk of running out of buffers. + If unsure, say 2. + config USB_GADGET_SELECTED boolean diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c index 1fa4f70..512d9cf 100644 --- a/drivers/usb/gadget/storage_common.c +++ b/drivers/usb/gadget/storage_common.c @@ -262,8 +262,8 @@ static struct fsg_lun *fsg_lun_from_dev(struct device *dev) #define EP0_BUFSIZE 256 #define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */ -/* Number of buffers we will use. 2 is enough for double-buffering */ -#define FSG_NUM_BUFFERS 2 +/* Number of buffers we will use. 2 is usually enough for double-buffering */ +#define FSG_NUM_BUFFERS CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS /* Default size of buffer length. */ #define FSG_BUFLEN ((u32)16384) -- 1.7.4.1

14 years, 1 month

Creatings automated tests on Android

by Amit Kucheria

Hi, In the PMWG, we'd like to to be able to run some apps and measure the power consumption while they run. Since the power measurement framework currently supports Android, does anybody know of automated ways to reproduce a test case? I found Robotium[1] on googling and would like to know if it is something we could standardize around. Regards, Amit [1] http://code.google.com/p/robotium/

14 years, 1 month

[PATCH v5] Add ARM cpu topology definition

by Vincent Guittot

The affinity between ARM processors is defined in the MPIDR register. We can identify which processors are in the same cluster, and which ones have performance interdependency. We can define the cpu topology of ARM platform, that is then used by sched_mc and sched_smt. The default state of sched_mc and sched_smt config is disable. When enabled, the behavior of the scheduler can be modified with sched_mc_power_savings and sched_smt_power_savings sysfs interfaces. Changes since v4 : * Remove unnecessary parentheses and blank lines Changes since v3 : * Update the format of printk message * Remove blank line Changes since v2 : * Update the commit message and some comments Changes since v1 : * Update the commit message * Add read_cpuid_mpidr in arch/arm/include/asm/cputype.h * Modify header of arch/arm/kernel/topology.c * Modify tests and manipulation of MPIDR's bitfields * Modify the place and dependancy of the config * Modify Noop functions Signed-off-by: Vincent Guittot <vincent.guittot(a)linaro.org> Reviewed-by: Amit Kucheria <amit.kucheria(a)linaro.org> --- arch/arm/Kconfig | 25 +++++++ arch/arm/include/asm/cputype.h | 6 ++ arch/arm/include/asm/topology.h | 33 +++++++++ arch/arm/kernel/Makefile | 1 + arch/arm/kernel/smp.c | 5 ++ arch/arm/kernel/topology.c | 148 +++++++++++++++++++++++++++++++++++++++ 6 files changed, 218 insertions(+), 0 deletions(-) create mode 100644 arch/arm/kernel/topology.c diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 9adc278..f327e55 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1344,6 +1344,31 @@ config SMP_ON_UP If you don't know what to do here, say Y. +config ARM_CPU_TOPOLOGY + bool "Support cpu topology definition" + depends on SMP && CPU_V7 + default y + help + Support ARM cpu topology definition. The MPIDR register defines + affinity between processors which is then used to describe the cpu + topology of an ARM System. + +config SCHED_MC + bool "Multi-core scheduler support" + depends on ARM_CPU_TOPOLOGY + help + Multi-core scheduler support improves the CPU scheduler's decision + making when dealing with multi-core CPU chips at a cost of slightly + increased overhead in some places. If unsure say N here. + +config SCHED_SMT + bool "SMT scheduler support" + depends on ARM_CPU_TOPOLOGY + help + Improves the CPU scheduler's decision making when dealing with + MultiThreading at a cost of slightly increased overhead in some + places. If unsure say N here. + config HAVE_ARM_SCU bool depends on SMP diff --git a/arch/arm/include/asm/cputype.h b/arch/arm/include/asm/cputype.h index cd4458f..cb47d28 100644 --- a/arch/arm/include/asm/cputype.h +++ b/arch/arm/include/asm/cputype.h @@ -8,6 +8,7 @@ #define CPUID_CACHETYPE 1 #define CPUID_TCM 2 #define CPUID_TLBTYPE 3 +#define CPUID_MPIDR 5 #define CPUID_EXT_PFR0 "c1, 0" #define CPUID_EXT_PFR1 "c1, 1" @@ -70,6 +71,11 @@ static inline unsigned int __attribute_const__ read_cpuid_tcmstatus(void) return read_cpuid(CPUID_TCM); } +static inline unsigned int __attribute_const__ read_cpuid_mpidr(void) +{ + return read_cpuid(CPUID_MPIDR); +} + /* * Intel's XScale3 core supports some v6 features (supersections, L2) * but advertises itself as v5 as it does not support the v6 ISA. For diff --git a/arch/arm/include/asm/topology.h b/arch/arm/include/asm/topology.h index accbd7c..a7e457e 100644 --- a/arch/arm/include/asm/topology.h +++ b/arch/arm/include/asm/topology.h @@ -1,6 +1,39 @@ #ifndef _ASM_ARM_TOPOLOGY_H #define _ASM_ARM_TOPOLOGY_H +#ifdef CONFIG_ARM_CPU_TOPOLOGY + +#include <linux/cpumask.h> + +struct cputopo_arm { + int thread_id; + int core_id; + int socket_id; + cpumask_t thread_sibling; + cpumask_t core_sibling; +}; + +extern struct cputopo_arm cpu_topology[NR_CPUS]; + +#define topology_physical_package_id(cpu) (cpu_topology[cpu].socket_id) +#define topology_core_id(cpu) (cpu_topology[cpu].core_id) +#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling) +#define topology_thread_cpumask(cpu) (&cpu_topology[cpu].thread_sibling) + +#define mc_capable() (cpu_topology[0].socket_id != -1) +#define smt_capable() (cpu_topology[0].thread_id != -1) + +void init_cpu_topology(void); +void store_cpu_topology(unsigned int cpuid); +const struct cpumask *cpu_coregroup_mask(unsigned int cpu); + +#else + +static inline void init_cpu_topology(void) { } +static inline void store_cpu_topology(unsigned int cpuid) { } + +#endif + #include <asm-generic/topology.h> #endif /* _ASM_ARM_TOPOLOGY_H */ diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index a5b31af..816a481 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -61,6 +61,7 @@ obj-$(CONFIG_IWMMXT) += iwmmxt.o obj-$(CONFIG_CPU_HAS_PMU) += pmu.o obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt +obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o ifneq ($(CONFIG_ARCH_EBSA110),y) obj-y += io.o diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 344e52b..051fd36 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -31,6 +31,7 @@ #include <asm/cacheflush.h> #include <asm/cpu.h> #include <asm/cputype.h> +#include <asm/topology.h> #include <asm/mmu_context.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> @@ -268,6 +269,8 @@ static void __cpuinit smp_store_cpu_info(unsigned int cpuid) struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid); cpu_info->loops_per_jiffy = loops_per_jiffy; + + store_cpu_topology(cpuid); } /* @@ -354,6 +357,8 @@ void __init smp_prepare_cpus(unsigned int max_cpus) { unsigned int ncores = num_possible_cpus(); + init_cpu_topology(); + smp_store_cpu_info(smp_processor_id()); /* diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c new file mode 100644 index 0000000..1040c00 --- /dev/null +++ b/arch/arm/kernel/topology.c @@ -0,0 +1,148 @@ +/* + * arch/arm/kernel/topology.c + * + * Copyright (C) 2011 Linaro Limited. + * Written by: Vincent Guittot + * + * based on arch/sh/kernel/topology.c + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/cpu.h> +#include <linux/cpumask.h> +#include <linux/init.h> +#include <linux/percpu.h> +#include <linux/node.h> +#include <linux/nodemask.h> +#include <linux/sched.h> + +#include <asm/cputype.h> +#include <asm/topology.h> + +#define MPIDR_SMP_BITMASK (0x3 << 30) +#define MPIDR_SMP_VALUE (0x2 << 30) + +#define MPIDR_MT_BITMASK (0x1 << 24) + +/* + * These masks reflect the current use of the affinity levels. + * The affinity level can be up to 16 bits according to ARM ARM + */ + +#define MPIDR_LEVEL0_MASK 0x3 +#define MPIDR_LEVEL0_SHIFT 0 + +#define MPIDR_LEVEL1_MASK 0xF +#define MPIDR_LEVEL1_SHIFT 8 + +#define MPIDR_LEVEL2_MASK 0xFF +#define MPIDR_LEVEL2_SHIFT 16 + +struct cputopo_arm cpu_topology[NR_CPUS]; + +const struct cpumask *cpu_coregroup_mask(unsigned int cpu) +{ + return &cpu_topology[cpu].core_sibling; +} + +/* + * store_cpu_topology is called at boot when only one cpu is running + * and with the mutex cpu_hotplug.lock locked, when several cpus have booted, + * which prevents simultaneous write access to cpu_topology array + */ +void store_cpu_topology(unsigned int cpuid) +{ + struct cputopo_arm *cpuid_topo = &cpu_topology[cpuid]; + unsigned int mpidr; + unsigned int cpu; + + /* If the cpu topology has been already set, just return */ + if (cpuid_topo->core_id != -1) + return; + + mpidr = read_cpuid_mpidr(); + + /* create cpu topology mapping */ + if ((mpidr & MPIDR_SMP_BITMASK) == MPIDR_SMP_VALUE) { + /* + * This is a multiprocessor system + * multiprocessor format & multiprocessor mode field are set + */ + + if (mpidr & MPIDR_MT_BITMASK) { + /* core performance interdependency */ + cpuid_topo->thread_id = (mpidr >> MPIDR_LEVEL0_SHIFT) + & MPIDR_LEVEL0_MASK; + cpuid_topo->core_id = (mpidr >> MPIDR_LEVEL1_SHIFT) + & MPIDR_LEVEL1_MASK; + cpuid_topo->socket_id = (mpidr >> MPIDR_LEVEL2_SHIFT) + & MPIDR_LEVEL2_MASK; + } else { + /* largely independent cores */ + cpuid_topo->thread_id = -1; + cpuid_topo->core_id = (mpidr >> MPIDR_LEVEL0_SHIFT) + & MPIDR_LEVEL0_MASK; + cpuid_topo->socket_id = (mpidr >> MPIDR_LEVEL1_SHIFT) + & MPIDR_LEVEL1_MASK; + } + } else { + /* + * This is an uniprocessor system + * we are in multiprocessor format but uniprocessor system + * or in the old uniprocessor format + */ + cpuid_topo->thread_id = -1; + cpuid_topo->core_id = 0; + cpuid_topo->socket_id = -1; + } + + /* update core and thread sibling masks */ + for_each_possible_cpu(cpu) { + struct cputopo_arm *cpu_topo = &cpu_topology[cpu]; + + if (cpuid_topo->socket_id == cpu_topo->socket_id) { + cpumask_set_cpu(cpuid, &cpu_topo->core_sibling); + if (cpu != cpuid) + cpumask_set_cpu(cpu, + &cpuid_topo->core_sibling); + + if (cpuid_topo->core_id == cpu_topo->core_id) { + cpumask_set_cpu(cpuid, + &cpu_topo->thread_sibling); + if (cpu != cpuid) + cpumask_set_cpu(cpu, + &cpuid_topo->thread_sibling); + } + } + } + smp_wmb(); + + printk(KERN_INFO "CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n", + cpuid, cpu_topology[cpuid].thread_id, + cpu_topology[cpuid].core_id, + cpu_topology[cpuid].socket_id, mpidr); +} + +/* + * init_cpu_topology is called at boot when only one cpu is running + * which prevent simultaneous write access to cpu_topology array + */ +void init_cpu_topology(void) +{ + unsigned int cpu; + + /* init core mask */ + for_each_possible_cpu(cpu) { + struct cputopo_arm *cpu_topo = &(cpu_topology[cpu]); + + cpu_topo->thread_id = -1; + cpu_topo->core_id = -1; + cpu_topo->socket_id = -1; + cpumask_clear(&cpu_topo->core_sibling); + cpumask_clear(&cpu_topo->thread_sibling); + } + smp_wmb(); +} -- 1.7.4.1

14 years, 1 month

Re: [PATCH v5] Add ARM cpu topology definition

by Russell King - ARM Linux

On Mon, Aug 08, 2011 at 04:42:42PM +0530, RACHANA TEWARI wrote: > Does anyone know way to initiate a bash script(to run on linux box) from > windows Written in C#? > > How to write these Scripts... This has nothing to do with CPU topology. Please do not topic hijack. This is also off-topic for these mailing lists. You may wish to consider posting your query to more appropriate mailing lists or forums (eg, those dealing with C#). Thanks.

14 years, 1 month

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