linaro-kernel February 2015

linaro-kernel@lists.linaro.org

36 participants
136 discussions

[PATCH 00/34] CPUFreq: Move freq change notifications out of drivers

by Viresh Kumar

Another 452 lines gone :) Total stats upto now for all the 5 patchsets: Viresh Kumar (186): ... 69 files changed, 700 insertions(+), 2451 deletions(-) Net: 1751 lines gone.. -----x-------------x---------------- Most of the drivers do following in their ->target_index() routines: struct cpufreq_freqs freqs; freqs.old = old freq... freqs.new = new freq... cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); /* Change rate here */ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); This is replicated over all cpufreq drivers today and there doesn't exists a good enough reason why this shouldn't be moved to cpufreq core instead. There are few special cases though, like exynos5440, which doesn't do everything on the call to ->target_index() routine and call some kind of bottom halves for doing this work, work/tasklet/etc.. They may continue doing notification from their own code and so this patch introduces another flag: CPUFREQ_NO_NOTIFICATION, which will be set by such drivers. This is Fifth part of my cleanup work for CPUFreq, first three are (And obviously its rebased over them): 1: cpufreq: Introduce cpufreq_table_validate_and_show() https://lkml.org/lkml/2013/8/8/263 2: cpufreq: define generic routines for cpufreq drivers https://lkml.org/lkml/2013/8/10/48 3. CPUFreq: Implement light weight ->target(): for 3.13 https://lkml.org/lkml/2013/8/13/349 4. CPUFreq: set policy->cur in cpufreq core instead of drivers https://lkml.org/lkml/2013/8/14/288 All these are pushed here: https://git.linaro.org/gitweb?p=people/vireshk/linux.git;a=shortlog;h=refs/… -- viresh Cc: Andrew Lunn <andrew(a)lunn.ch> Cc: David S. Miller <davem(a)davemloft.net> Cc: Dmitry Eremin-Solenikov <dbaryshkov(a)gmail.com> Cc: Eric Miao <eric.y.miao(a)gmail.com> Cc: Hans-Christian Egtvedt <egtvedt(a)samfundet.no> Cc: Jesper Nilsson <jesper.nilsson(a)axis.com> Cc: John Crispin <blogic(a)openwrt.org> Cc: Kukjin Kim <kgene.kim(a)samsung.com> Cc: Linus Walleij <linus.walleij(a)linaro.org> Cc: linux-cris-kernel(a)axis.com Cc: Mikael Starvik <starvik(a)axis.com> Cc: Russell King <linux(a)arm.linux.org.uk> Cc: Santosh Shilimkar <santosh.shilimkar(a)ti.com> Cc: Sekhar Nori <nsekhar(a)ti.com> Cc: Shawn Guo <shawn.guo(a)linaro.org> Cc: sparclinux(a)vger.kernel.org Cc: spear-devel(a)list.st.com Cc: Stephen Warren <swarren(a)nvidia.com> Cc: Steven Miao <realmz6(a)gmail.com> Cc: Tony Luck <tony.luck(a)intel.com> Viresh Kumar (34): cpufreq: move freq change notifications to cpufreq core cpufreq: acpi: remove calls to cpufreq_notify_transition() cpufreq: arm_big_little: remove calls to cpufreq_notify_transition() cpufreq: at32ap: remove calls to cpufreq_notify_transition() cpufreq: blackfin: remove calls to cpufreq_notify_transition() cpufreq: cpu0: remove calls to cpufreq_notify_transition() cpufreq: cris: remove calls to cpufreq_notify_transition() cpufreq: davinci: remove calls to cpufreq_notify_transition() cpufreq: dbx500: remove calls to cpufreq_notify_transition() cpufreq: e_powersaver: remove calls to cpufreq_notify_transition() cpufreq: elanfreq: remove calls to cpufreq_notify_transition() cpufreq: exynos: remove calls to cpufreq_notify_transition() cpufreq: exynos5440: set CPUFREQ_NO_NOTIFICATION flag cpufreq: ia64-acpi: remove calls to cpufreq_notify_transition() cpufreq: imx6q: remove calls to cpufreq_notify_transition() cpufreq: kirkwood: remove calls to cpufreq_notify_transition() cpufreq: longhaul: set CPUFREQ_NO_NOTIFICATION flag cpufreq: loongson2: remove calls to cpufreq_notify_transition() cpufreq: maple: remove calls to cpufreq_notify_transition() cpufreq: omap: remove calls to cpufreq_notify_transition() cpufreq: p4-clockmod: remove calls to cpufreq_notify_transition() cpufreq: pasemi: remove calls to cpufreq_notify_transition() cpufreq: pmac: remove calls to cpufreq_notify_transition() cpufreq: powernow: remove calls to cpufreq_notify_transition() cpufreq: ppc: remove calls to cpufreq_notify_transition() cpufreq: pxa: remove calls to cpufreq_notify_transition() cpufreq: s3c: remove calls to cpufreq_notify_transition() cpufreq: s5pv210: remove calls to cpufreq_notify_transition() cpufreq: sa11x0: remove calls to cpufreq_notify_transition() cpufreq: sc520: remove calls to cpufreq_notify_transition() cpufreq: sparc: remove calls to cpufreq_notify_transition() cpufreq: SPEAr: remove calls to cpufreq_notify_transition() cpufreq: speedstep: remove calls to cpufreq_notify_transition() cpufreq: tegra: remove calls to cpufreq_notify_transition() drivers/cpufreq/acpi-cpufreq.c | 14 ++------- drivers/cpufreq/arm_big_little.c | 25 ++-------------- drivers/cpufreq/at32ap-cpufreq.c | 22 ++++++-------- drivers/cpufreq/blackfin-cpufreq.c | 22 +++++--------- drivers/cpufreq/cpufreq-cpu0.c | 33 ++++++++------------- drivers/cpufreq/cpufreq.c | 34 +++++++++++++++++++++ drivers/cpufreq/cris-artpec3-cpufreq.c | 8 ----- drivers/cpufreq/cris-etraxfs-cpufreq.c | 8 ----- drivers/cpufreq/davinci-cpufreq.c | 30 +++++++------------ drivers/cpufreq/dbx500-cpufreq.c | 22 +------------- drivers/cpufreq/e_powersaver.c | 23 ++------------- drivers/cpufreq/elanfreq.c | 13 -------- drivers/cpufreq/exynos-cpufreq.c | 28 +++++------------- drivers/cpufreq/exynos5440-cpufreq.c | 2 +- drivers/cpufreq/ia64-acpi-cpufreq.c | 19 ------------ drivers/cpufreq/imx6q-cpufreq.c | 39 ++++++++++-------------- drivers/cpufreq/kirkwood-cpufreq.c | 54 +++++++++++++--------------------- drivers/cpufreq/longhaul.c | 1 + drivers/cpufreq/loongson2_cpufreq.c | 16 ---------- drivers/cpufreq/maple-cpufreq.c | 18 +----------- drivers/cpufreq/omap-cpufreq.c | 39 +++++++++--------------- drivers/cpufreq/p4-clockmod.c | 10 ------- drivers/cpufreq/pasemi-cpufreq.c | 14 +-------- drivers/cpufreq/pmac32-cpufreq.c | 20 +++---------- drivers/cpufreq/pmac64-cpufreq.c | 18 +----------- drivers/cpufreq/powernow-k6.c | 8 ----- drivers/cpufreq/powernow-k7.c | 11 +------ drivers/cpufreq/powernow-k8.c | 15 +--------- drivers/cpufreq/ppc-corenet-cpufreq.c | 19 +----------- drivers/cpufreq/ppc_cbe_cpufreq.c | 19 +----------- drivers/cpufreq/pxa2xx-cpufreq.c | 27 ++++------------- drivers/cpufreq/pxa3xx-cpufreq.c | 12 -------- drivers/cpufreq/s3c2416-cpufreq.c | 21 +++---------- drivers/cpufreq/s3c64xx-cpufreq.c | 48 ++++++++++-------------------- drivers/cpufreq/s5pv210-cpufreq.c | 16 ++++------ drivers/cpufreq/sa1100-cpufreq.c | 17 ++++------- drivers/cpufreq/sa1110-cpufreq.c | 12 ++------ drivers/cpufreq/sc520_freq.c | 11 ------- drivers/cpufreq/sparc-us2e-cpufreq.c | 7 ----- drivers/cpufreq/sparc-us3-cpufreq.c | 7 ----- drivers/cpufreq/spear-cpufreq.c | 13 +------- drivers/cpufreq/speedstep-centrino.c | 20 +------------ drivers/cpufreq/speedstep-ich.c | 9 ------ drivers/cpufreq/speedstep-smi.c | 7 ----- drivers/cpufreq/tegra-cpufreq.c | 25 ++++------------ include/linux/cpufreq.h | 6 ++++ 46 files changed, 205 insertions(+), 657 deletions(-) -- 1.7.12.rc2.18.g61b472e

6 years, 6 months

[RFC] ARM: exynos: MCPM: [is this a] fix for secondary boot on 5422?

by Kevin Hilman

From: Kevin Hilman <khilman(a)linaro.org> Using the current exynos_defconfig on the exynos5422-odroid-xu3, only 6 of 8 CPUs come online with MCPM boot. CPU0 is an A7, CPUs 1-4 are A15s and CPU5-7 are the other A7s, but with the current code, CPUs 5 and 7 do not boot: [...] Exynos MCPM support installed CPU1: update cpu_capacity 1535 CPU1: thread -1, cpu 0, socket 0, mpidr 80000000 CPU2: update cpu_capacity 1535 CPU2: thread -1, cpu 1, socket 0, mpidr 80000001 CPU3: update cpu_capacity 1535 CPU3: thread -1, cpu 2, socket 0, mpidr 80000002 CPU4: update cpu_capacity 1535 CPU4: thread -1, cpu 3, socket 0, mpidr 80000003 CPU5: failed to come online CPU6: update cpu_capacity 448 CPU6: thread -1, cpu 2, socket 1, mpidr 80000102 CPU7: failed to come online Brought up 6 CPUs CPU: WARNING: CPU(s) started in wrong/inconsistent modes (primary CPU mode 0x13) CPU: This may indicate a broken bootloader or firmware. Thanks to a tip from Abhilash, this patch gets all 8 CPUs booting again, but the warning about CPUs started in inconsistent modes remains. Also, not being terribly familiar with Exynos internals, it's not at all obvious to me why this register write (done for *all* secondaries) makes things work works for the 2 secondary CPUs that didn't come online. It's also not obvious whether this is the right general fix, since it doesn't seem to be needed on other 542x or 5800 platforms. I suspect the "right" fix is in the bootloader someplace, but not knowing this hardware well, I'm not sure if the fix is in u-boot proper, or somewhere in the binary blobs (bl1/bl2/tz) that start before u-boot. The u-boot I'm using is from the hardkernel u-boot repo[1], and I'd welcome any suggestions to try. I'm able to rebuild my own u-boot from there, but only have binaries for bl1/bl2/tz. [1] branch "odroidxu3-v2012.07" of: https://github.com/hardkernel/u-boot.git Cc: Mauro Ribeiro <mauro.ribeiro(a)hardkernel.com> Cc: Abhilash Kesavan <a.kesavan(a)samsung.com>, Cc: Andrew Bresticker <abrestic(a)chromium.org> Cc: Doug Anderson <dianders(a)chromium.org> Cc: Nicolas Pitre <nicolas.pitre(a)linaro.org> Signed-off-by: Kevin Hilman <khilman(a)linaro.org> --- arch/arm/mach-exynos/mcpm-exynos.c | 2 ++ arch/arm/mach-exynos/regs-pmu.h | 1 + 2 files changed, 3 insertions(+) diff --git a/arch/arm/mach-exynos/mcpm-exynos.c b/arch/arm/mach-exynos/mcpm-exynos.c index b0d3c2e876fb..612a770d5284 100644 --- a/arch/arm/mach-exynos/mcpm-exynos.c +++ b/arch/arm/mach-exynos/mcpm-exynos.c @@ -88,6 +88,8 @@ static int exynos_power_up(unsigned int cpu, unsigned int cluster) cluster >= EXYNOS5420_NR_CLUSTERS) return -EINVAL; + pmu_raw_writel(0x1, S5P_PMU_SPARE2); + /* * Since this is called with IRQs enabled, and no arch_spin_lock_irq * variant exists, we need to disable IRQs manually here. diff --git a/arch/arm/mach-exynos/regs-pmu.h b/arch/arm/mach-exynos/regs-pmu.h index b5f4406fc1b5..70d9eb5a4fcc 100644 --- a/arch/arm/mach-exynos/regs-pmu.h +++ b/arch/arm/mach-exynos/regs-pmu.h @@ -49,6 +49,7 @@ #define S5P_INFORM5 0x0814 #define S5P_INFORM6 0x0818 #define S5P_INFORM7 0x081C +#define S5P_PMU_SPARE2 0x0908 #define S5P_PMU_SPARE3 0x090C #define EXYNOS_IROM_DATA2 0x0988 -- 2.1.3

8 years, 10 months

[RFCv3 1/2] device: add dma_params->max_segment_count

by Sumit Semwal

From: Rob Clark <robdclark(a)gmail.com> For devices which have constraints about maximum number of segments in an sglist. For example, a device which could only deal with contiguous buffers would set max_segment_count to 1. The initial motivation is for devices sharing buffers via dma-buf, to allow the buffer exporter to know the constraints of other devices which have attached to the buffer. The dma_mask and fields in 'struct device_dma_parameters' tell the exporter everything else that is needed, except whether the importer has constraints about maximum number of segments. Signed-off-by: Rob Clark <robdclark(a)gmail.com> [sumits: Minor updates wrt comments] Signed-off-by: Sumit Semwal <sumit.semwal(a)linaro.org> --- v3: include Robin Murphy's fix[1] for handling '0' as a value for max_segment_count v2: minor updates wrt comments on the first version [1]: http://article.gmane.org/gmane.linux.kernel.iommu/8175/ include/linux/device.h | 1 + include/linux/dma-mapping.h | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/linux/device.h b/include/linux/device.h index fb506738f7b7..a32f9b67315c 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -647,6 +647,7 @@ struct device_dma_parameters { * sg limitations. */ unsigned int max_segment_size; + unsigned int max_segment_count; /* INT_MAX for unlimited */ unsigned long segment_boundary_mask; }; diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index c3007cb4bfa6..d3351a36d5ec 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -154,6 +154,25 @@ static inline unsigned int dma_set_max_seg_size(struct device *dev, return -EIO; } +#define DMA_SEGMENTS_MAX_SEG_COUNT ((unsigned int) INT_MAX) + +static inline unsigned int dma_get_max_seg_count(struct device *dev) +{ + if (dev->dma_parms && dev->dma_parms->max_segment_count) + return dev->dma_parms->max_segment_count; + return DMA_SEGMENTS_MAX_SEG_COUNT; +} + +static inline int dma_set_max_seg_count(struct device *dev, + unsigned int count) +{ + if (dev->dma_parms) { + dev->dma_parms->max_segment_count = count; + return 0; + } + return -EIO; +} + static inline unsigned long dma_get_seg_boundary(struct device *dev) { return dev->dma_parms ? -- 1.9.1

8 years, 10 months

[PATCH V2 00/20] cpufreq: Don't loose cpufreq history on CPU hotplug

by Viresh Kumar

Hi Rafael, The aim of this series is to stop managing cpufreq sysfs directories on CPU hotplugs. Currently on removal of a 'cpu != policy->cpu', we remove its sysfs directories by removing the soft-link. And on removal of policy->cpu, we migrate the sysfs directories to the next cpu. But if policy->cpu was the last CPU, we remove the policy completely and allocate it again as soon as the CPUs come back. This has shortcomings: - Code Complexity - Slower hotplug - sysfs file permissions are reset after all policy->cpus are offlined - CPUFreq stats history lost after all policy->cpus are offlined - Special management of sysfs stuff during suspend/resume To make things simple we stop playing with sysfs files unless the driver is getting removed. Also the policy is kept intact to be used later. First few patches provide a clean base for others *more important* patches. Rebased-over: your bleeding edge branch as there were dependencies on my earlier patches. Pushed here: git://git.linaro.org/people/viresh.kumar/linux.git cpufreq/core/sysfs v1->V2: - Dropped the idea of using policy-lists for getting policy for any cpu - Also dropped fallback list and its per-cpu variable - Stopped cleaning cpufreq_cpu_data and doing list_del(policy) on logical hotplug. - Added support for physical hotplug of CPUs (Untested). @Srivatsa: Can you please have a look at the above change? I have cc'd you only on this one. Saravana Kannan (1): cpufreq: Track cpu managing sysfs kobjects separately Cc: Srivatsa Bhat <srivatsa(a)mit.edu> Viresh Kumar (19): cpufreq: Add doc style comment about cpufreq_cpu_{get|put}() cpufreq: Merge __cpufreq_add_dev() and cpufreq_add_dev() cpufreq: Throw warning when we try to get policy for an invalid CPU cpufreq: Keep a single path for adding managed CPUs cpufreq: Clear policy->cpus even for the last CPU cpufreq: Create for_each_{in}active_policy() cpufreq: Call schedule_work() for the last active policy cpufreq: Don't clear cpufreq_cpu_data and policy list for inactive policies cpufreq: Get rid of cpufreq_cpu_data_fallback cpufreq: Don't traverse list of all policies for adding policy for a cpu cpufreq: Manage governor usage history with 'policy->last_governor' cpufreq: Mark policy->governor = NULL for inactive policies cpufreq: Don't allow updating inactive-policies from sysfs cpufreq: Stop migrating sysfs files on hotplug cpufreq: Remove cpufreq_update_policy() cpufreq: Initialize policy->kobj while allocating policy cpufreq: Call cpufreq_policy_put_kobj() from cpufreq_policy_free() cpufreq: Restart governor as soon as possible cpufreq: Add support for physical hoplug of CPUs drivers/cpufreq/cpufreq.c | 593 ++++++++++++++++++++++++++-------------------- include/linux/cpufreq.h | 5 +- 2 files changed, 340 insertions(+), 258 deletions(-) -- 2.3.0.rc0.44.ga94655d

8 years, 11 months

[PATCH v10 00/11] sched: consolidation of CPU capacity and usage

by Vincent Guittot

This patchset consolidates several changes in the capacity and the usage tracking of the CPU. It provides a frequency invariant metric of the usage of CPUs and generally improves the accuracy of load/usage tracking in the scheduler. The frequency invariant metric is the foundation required for the consolidation of cpufreq and implementation of a fully invariant load tracking. These are currently WIP and require several changes to the load balancer (including how it will use and interprets load and capacity metrics) and extensive validation. The frequency invariance is done with arch_scale_freq_capacity and this patchset doesn't provide the backends of the function which are architecture dependent. As discussed at LPC14, Morten and I have consolidated our changes into a single patchset to make it easier to review and merge. During load balance, the scheduler evaluates the number of tasks that a group of CPUs can handle. The current method assumes that tasks have a fix load of SCHED_LOAD_SCALE and CPUs have a default capacity of SCHED_CAPACITY_SCALE. This assumption generates wrong decision by creating ghost cores or by removing real ones when the original capacity of CPUs is different from the default SCHED_CAPACITY_SCALE. With this patch set, we don't try anymore to evaluate the number of available cores based on the group_capacity but instead we evaluate the usage of a group and compare it with its capacity. This patchset mainly replaces the old capacity_factor method by a new one and keeps the general policy almost unchanged. These new metrics will be also used in later patches. The CPU usage is based on a running time tracking version of the current implementation of the load average tracking. I also have a version that is based on the new implementation proposal [1] but I haven't provide the patches and results as [1] is still under review. I can provide change above [1] to change how CPU usage is computed and to adapt to new mecanism. Change since V9 - add a dedicated patch for removing unused capacity_orig - update some comments and fix typo - change the condition for actively migrating task on CPU with higher capacity Change since V8 - reorder patches Change since V7 - add freq invariance for usage tracking - add freq invariance for scale_rt - update comments and commits' message - fix init of utilization_avg_contrib - fix prefer_sibling Change since V6 - add group usage tracking - fix some commits' messages - minor fix like comments and argument order Change since V5 - remove patches that have been merged since v5 : patches 01, 02, 03, 04, 05, 07 - update commit log and add more details on the purpose of the patches - fix/remove useless code with the rebase on patchset [2] - remove capacity_orig in sched_group_capacity as it is not used - move code in the right patch - add some helper function to factorize code Change since V4 - rebase to manage conflicts with changes in selection of busiest group Change since V3: - add usage_avg_contrib statistic which sums the running time of tasks on a rq - use usage_avg_contrib instead of runnable_avg_sum for cpu_utilization - fix replacement power by capacity - update some comments Change since V2: - rebase on top of capacity renaming - fix wake_affine statistic update - rework nohz_kick_needed - optimize the active migration of a task from CPU with reduced capacity - rename group_activity by group_utilization and remove unused total_utilization - repair SD_PREFER_SIBLING and use it for SMT level - reorder patchset to gather patches with same topics Change since V1: - add 3 fixes - correct some commit messages - replace capacity computation by activity - take into account current cpu capacity [1] https://lkml.org/lkml/2014/10/10/131 [2] https://lkml.org/lkml/2014/7/25/589 Morten Rasmussen (2): sched: Track group sched_entity usage contributions sched: Make sched entity usage tracking scale-invariant Vincent Guittot (9): sched: add utilization_avg_contrib sched: remove frequency scaling from cpu_capacity sched: make scale_rt invariant with frequency sched: add per rq cpu_capacity_orig sched: get CPU's usage statistic sched: replace capacity_factor by usage sched; remove unused capacity_orig from sched: add SD_PREFER_SIBLING for SMT level sched: move cfs task on a CPU with higher capacity include/linux/sched.h | 21 ++- kernel/sched/core.c | 15 +-- kernel/sched/debug.c | 12 +- kernel/sched/fair.c | 366 +++++++++++++++++++++++++++++++------------------- kernel/sched/sched.h | 15 ++- 5 files changed, 271 insertions(+), 158 deletions(-) -- 1.9.1

9 years

[PATCH] arm: perf: Directly handle SMP platforms with one SPI

by Daniel Thompson

Some ARM platforms mux the PMU interrupt of every core into a single SPI. On such platforms if the PMU of any core except 0 raises an interrupt then it cannot be serviced and eventually, if you are lucky, the spurious irq detection might forcefully disable the interrupt. On these SoCs it is not possible to determine which core raised the interrupt so workaround this issue by queuing irqwork on the other cores whenever the primary interrupt handler is unable to service the interrupt. The u8500 platform has an alternative workaround that dynamically alters the affinity of the PMU interrupt. This workaround logic is no longer required so the original code is removed as is the hook it relied upon. Tested on imx6q (which has fours cores/PMUs all muxed to a single SPI). Signed-off-by: Daniel Thompson <daniel.thompson(a)linaro.org> --- Notes: Thanks to Lucas Stach, Russell King and Thomas Gleixner for critiquing an older, completely different way to tackle the same problem. arch/arm/include/asm/pmu.h | 10 +++++ arch/arm/kernel/perf_event.c | 11 ++--- arch/arm/kernel/perf_event_cpu.c | 94 ++++++++++++++++++++++++++++++++++++++++ arch/arm/mach-ux500/cpu-db8500.c | 29 ------------- 4 files changed, 107 insertions(+), 37 deletions(-) diff --git a/arch/arm/include/asm/pmu.h b/arch/arm/include/asm/pmu.h index 0b648c541293..36472c3cc283 100644 --- a/arch/arm/include/asm/pmu.h +++ b/arch/arm/include/asm/pmu.h @@ -81,6 +81,12 @@ struct pmu_hw_events { raw_spinlock_t pmu_lock; }; +struct arm_pmu_work { + struct irq_work work; + struct arm_pmu *arm_pmu; + atomic_t ret; +}; + struct arm_pmu { struct pmu pmu; cpumask_t active_irqs; @@ -101,6 +107,7 @@ struct arm_pmu { void (*reset)(void *); int (*request_irq)(struct arm_pmu *, irq_handler_t handler); void (*free_irq)(struct arm_pmu *); + irqreturn_t (*handle_irq_none)(struct arm_pmu *); int (*map_event)(struct perf_event *event); int num_events; atomic_t active_events; @@ -108,6 +115,9 @@ struct arm_pmu { u64 max_period; struct platform_device *plat_device; struct pmu_hw_events *(*get_hw_events)(void); + int single_irq; + struct arm_pmu_work __percpu *work; + atomic_t remaining_work; }; #define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu)) diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c index b50a770f8c99..0792c913b9bb 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -306,22 +306,17 @@ validate_group(struct perf_event *event) static irqreturn_t armpmu_dispatch_irq(int irq, void *dev) { struct arm_pmu *armpmu; - struct platform_device *plat_device; - struct arm_pmu_platdata *plat; int ret; u64 start_clock, finish_clock; if (irq_is_percpu(irq)) dev = *(void **)dev; armpmu = dev; - plat_device = armpmu->plat_device; - plat = dev_get_platdata(&plat_device->dev); start_clock = sched_clock(); - if (plat && plat->handle_irq) - ret = plat->handle_irq(irq, dev, armpmu->handle_irq); - else - ret = armpmu->handle_irq(irq, dev); + ret = armpmu->handle_irq(irq, dev); + if (ret == IRQ_NONE && armpmu->handle_irq_none) + ret = armpmu->handle_irq_none(dev); finish_clock = sched_clock(); perf_sample_event_took(finish_clock - start_clock); diff --git a/arch/arm/kernel/perf_event_cpu.c b/arch/arm/kernel/perf_event_cpu.c index eb2c4d55666b..e7153dc3b489 100644 --- a/arch/arm/kernel/perf_event_cpu.c +++ b/arch/arm/kernel/perf_event_cpu.c @@ -88,6 +88,75 @@ static void cpu_pmu_disable_percpu_irq(void *data) disable_percpu_irq(irq); } +/* + * Workaround logic that is distributed to all cores if the PMU has only + * a single IRQ and the CPU receiving that IRQ cannot handle it. Its + * job is to try to service the interrupt on the current CPU. It will + * also enable the IRQ again if all the other CPUs have already tried to + * service it. + */ +static void cpu_pmu_do_percpu_work(struct irq_work *w) +{ + struct arm_pmu_work *work = container_of(w, struct arm_pmu_work, work); + struct arm_pmu *cpu_pmu = work->arm_pmu; + + atomic_set(&work->ret, + cpu_pmu->handle_irq(cpu_pmu->single_irq, cpu_pmu)); + + if (atomic_dec_and_test(&cpu_pmu->remaining_work)) + enable_irq(cpu_pmu->single_irq); +} + +/* + * This callback, which is enabled only on SMP platforms that are + * running with a single IRQ, is called when the PMU handler running in + * the current CPU cannot service the interrupt. + * + * It will disable the interrupt and distribute irqwork to all other + * processors in the system. Hopefully one of them will clear the + * interrupt... + */ +static irqreturn_t cpu_pmu_handle_irq_none(struct arm_pmu *cpu_pmu) +{ + int num_online = num_online_cpus(); + irqreturn_t ret = IRQ_NONE; + int cpu, cret; + + if (num_online <= 1) + return IRQ_NONE; + + disable_irq_nosync(cpu_pmu->single_irq); + atomic_add(num_online, &cpu_pmu->remaining_work); + smp_mb__after_atomic(); + + for_each_online_cpu(cpu) { + struct arm_pmu_work *work = per_cpu_ptr(cpu_pmu->work, cpu); + + if (cpu == smp_processor_id()) + continue; + + /* + * We can be extremely relaxed about memory ordering + * here. All we are doing is gathering information + * about the past to help us give a return value that + * will keep the spurious interrupt detector both happy + * *and* functional. We are not shared so we can + * tolerate the occasional spurious IRQ_HANDLED. + */ + cret = atomic_read(&work->ret); + if (cret != IRQ_NONE) + ret = cret; + + if (!irq_work_queue_on(&work->work, cpu)) + atomic_dec(&cpu_pmu->remaining_work); + } + + if (atomic_dec_and_test(&cpu_pmu->remaining_work)) + enable_irq(cpu_pmu->single_irq); + + return ret; +} + static void cpu_pmu_free_irq(struct arm_pmu *cpu_pmu) { int i, irq, irqs; @@ -107,6 +176,9 @@ static void cpu_pmu_free_irq(struct arm_pmu *cpu_pmu) if (irq >= 0) free_irq(irq, cpu_pmu); } + + cpu_pmu->handle_irq_none = cpu_pmu_handle_irq_none; + free_percpu(cpu_pmu->work); } } @@ -162,6 +234,28 @@ static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler) cpumask_set_cpu(i, &cpu_pmu->active_irqs); } + + /* + * If we are running SMP and have only one interrupt source + * then get ready to share that single irq among the cores. + */ + if (nr_cpu_ids > 1 && irqs == 1) { + cpu_pmu->single_irq = platform_get_irq(pmu_device, 0); + cpu_pmu->work = alloc_percpu(struct arm_pmu_work); + if (!cpu_pmu->work) { + pr_err("no memory for shared IRQ workaround\n"); + return -ENOMEM; + } + + for_each_possible_cpu(i) { + struct arm_pmu_work *w = + per_cpu_ptr(cpu_pmu->work, i); + init_irq_work(&w->work, cpu_pmu_do_percpu_work); + w->arm_pmu = cpu_pmu; + } + + cpu_pmu->handle_irq_none = cpu_pmu_handle_irq_none; + } } return 0; diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c index 6f63954c8bde..917774999c5c 100644 --- a/arch/arm/mach-ux500/cpu-db8500.c +++ b/arch/arm/mach-ux500/cpu-db8500.c @@ -12,8 +12,6 @@ #include <linux/init.h> #include <linux/device.h> #include <linux/amba/bus.h> -#include <linux/interrupt.h> -#include <linux/irq.h> #include <linux/platform_device.h> #include <linux/io.h> #include <linux/mfd/abx500/ab8500.h> @@ -23,7 +21,6 @@ #include <linux/regulator/machine.h> #include <linux/random.h> -#include <asm/pmu.h> #include <asm/mach/map.h> #include "setup.h" @@ -99,30 +96,6 @@ static void __init u8500_map_io(void) iotable_init(u8500_io_desc, ARRAY_SIZE(u8500_io_desc)); } -/* - * The PMU IRQ lines of two cores are wired together into a single interrupt. - * Bounce the interrupt to the other core if it's not ours. - */ -static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler) -{ - irqreturn_t ret = handler(irq, dev); - int other = !smp_processor_id(); - - if (ret == IRQ_NONE && cpu_online(other)) - irq_set_affinity(irq, cpumask_of(other)); - - /* - * We should be able to get away with the amount of IRQ_NONEs we give, - * while still having the spurious IRQ detection code kick in if the - * interrupt really starts hitting spuriously. - */ - return ret; -} - -static struct arm_pmu_platdata db8500_pmu_platdata = { - .handle_irq = db8500_pmu_handler, -}; - static const char *db8500_read_soc_id(void) { void __iomem *uid = __io_address(U8500_BB_UID_BASE); @@ -143,8 +116,6 @@ static struct device * __init db8500_soc_device_init(void) } static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = { - /* Requires call-back bindings. */ - OF_DEV_AUXDATA("arm,cortex-a9-pmu", 0, "arm-pmu", &db8500_pmu_platdata), /* Requires DMA bindings. */ OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80123000, "ux500-msp-i2s.0", &msp0_platform_data), -- 1.9.3

9 years

[PATCH 0/7] OPP: Introduce OPP bindings V2 and supporting code

by Viresh Kumar

Now that I have received an verbal Ack from Rob Herring (in a personal conversation) about the bindings, I am showing how the code looks like with these new bindings. Some part is still now done: - Interface for adding new detailed OPPs from platform code instead of DT - Providing cpufreq helpers for the next OPPs - Providing regulator helpers for the target/min/max ranges Please provide feedback on how this looks like.. -- viresh Viresh Kumar (7): OPP: Redefine bindings to overcome shortcomings opp: Relocate few routines OPP: Break _opp_add_dynamic() into smaller functions opp: Parse new (v2) bindings opp: convert device_opp->dev to a list of devices opp: Add helpers for initializing CPU opps cpufreq-dt: Use DT to set policy->cpus/related_cpus Documentation/devicetree/bindings/power/opp.txt | 407 ++++++++- drivers/base/power/opp.c | 1041 +++++++++++++++++------ drivers/cpufreq/cpufreq-dt.c | 16 +- include/linux/pm_opp.h | 23 + 4 files changed, 1232 insertions(+), 255 deletions(-) -- 2.3.0.rc0.44.ga94655d

9 years

[PATCH] clocksource: efm32: Use CLOCK_EVT_FEAT_PERIODIC for defining features

by Viresh Kumar

We have used CLOCK_EVT_MODE_PERIODIC instead of CLOCK_EVT_FEAT_PERIODIC while defining features. Fix it. Cc: Uwe Kleine-Koenig <u.kleine-koenig(a)pengutronix.de> Signed-off-by: Viresh Kumar <viresh.kumar(a)linaro.org> --- drivers/clocksource/time-efm32.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/clocksource/time-efm32.c b/drivers/clocksource/time-efm32.c index bba62f9deefb..9edeab37a14b 100644 --- a/drivers/clocksource/time-efm32.c +++ b/drivers/clocksource/time-efm32.c @@ -111,7 +111,7 @@ static irqreturn_t efm32_clock_event_handler(int irq, void *dev_id) static struct efm32_clock_event_ddata clock_event_ddata = { .evtdev = { .name = "efm32 clockevent", - .features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_MODE_PERIODIC, + .features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC, .set_mode = efm32_clock_event_set_mode, .set_next_event = efm32_clock_event_set_next_event, .rating = 200, -- 2.3.0.rc0.44.ga94655d

9 years

[PATCH 0/3] clockevents: Manage device's state separately for core

by Viresh Kumar

Hi Thomas/Ingo, This is in response to the suggestions Ingo gave [1] on the shortcomings of clockevents core's state machine. This first separates out the RESUME functionality from other states as its a special case. Then it defines a new enum to map possible states of a clockevent device. Ideally it should only be available for the core, but as bL switcher is using it today, it is exposed in clockchips.h. That dependency will go away after applying the Thomas's work (Sent out be Peter) and then we can move this enum to somewhere in kernel/time/. The last patch moves the legacy check to the legacy code. Please see if this meets your expectation or if you have some suggestions on it. Rebased of tip/master as there were some dependencies: 575daeea39a3 Merge branch 'tools/kvm' This along with migration of few clockevents drivers is pushed here: git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git clkevt/manage-state -- Viresh [1] https://lkml.org/lkml/2015/2/20/107 Viresh Kumar (3): clockevents: Handle tick device's resume separately clockevents: Manage device's state separately for the core clockevents: Don't validate dev->mode against CLOCK_EVT_MODE_UNUSED for new interface arch/arm/common/bL_switcher.c | 8 +-- include/linux/clockchips.h | 48 +++++++++++------ kernel/time/clockevents.c | 118 ++++++++++++++++++++++++------------------ kernel/time/tick-broadcast.c | 22 ++++---- kernel/time/tick-common.c | 9 ++-- kernel/time/tick-internal.h | 1 + kernel/time/tick-oneshot.c | 6 +-- kernel/time/timer_list.c | 16 +++--- 8 files changed, 134 insertions(+), 94 deletions(-) -- 2.3.0.rc0.44.ga94655d

9 years, 1 month

[PATCH 3.19-rc2 v15 0/8] irq/arm: Implement arch_trigger_all_cpu_backtrace

by Daniel Thompson

This patchset modifies the GIC driver to allow it, on supported platforms, to route IPI interrupts to FIQ. It then uses this feature to implement arch_trigger_all_cpu_backtrace for arm. In order to neatly (and safely) bring in the changes for the arm we also make the sched_clock implementation NMI-safe and rearrange some of the existing x86 NMI code to make it architecture neutral. This patchset touches a fairly large number of different sub-systems (irq, generic sched_clock, printk, x86, arm). However, of the eight patches, five fall under one of tglx's maintainerships (either through irq, time or x86). Thus unless there are objections I'd like to gather acks from some of the folks Cc:ed on the patches. Then I can wrap it up nicely and send it to Thomas. The patches have been runtime tested on two systems capable of supporting FIQ (Freescale i.MX6 and STiH416) and two that do not (vexpress-a9 and Qualcomm Snapdragon 600), the changes to the x86 logic were tested on qemu and all patches have been compile tested on x86, arm and arm64. Note: On platforms not capable of supporting FIQ, the IPI to generate a backtrace will fall back to using IRQ for propagation instead. The backtrace logic contains a timeout to we will not wedge the requesting CPU if other CPUs are not responsive. v15: * Added a patch to make sched_clock safe to call from NMI (Stephen Boyd). Note that sched_clock() is not called by the NMI handlers that have been added for the arm but it could be called if tools such as ftrace are deployed. * Fixed some warnings picked up during bisectability testing. v14: * Moved a nmi_vprintk() and friends from arch/x86/kernel/apic/hw_nmi.c to printk.c (Steven Rostedt) v13: * Updated the code to print the backtrace to replicate Steven Rostedt's x86 work to make SysRq-l safe. This is pretty much a total rewrite of patches 4 and 5. v12: * Squash first two patches into a single one and re-describe (Thomas Gleixner). * Improve description of "irqchip: gic: Make gic_raise_softirq FIQ-safe" (Thomas Gleixner). v11: * Optimized gic_raise_softirq() by replacing a register read with a memory read (Jason Cooper). v10: * Add a further patch to optimize away some of the locking on systems where CONFIG_BL_SWITCHER is not set (Marc Zyngier). Compiles OK with exynos_defconfig (which is the only defconfig to set this option). * Whitespace fixes in patch 4. That patch previously used spaces for alignment of new constants but the rest of the file used tabs. v9: * Improved documentation and structure of initial patch (now initial two patches) to make gic_raise_softirq() safe to call from FIQ (Thomas Gleixner). * Avoid masking interrupts during gic_raise_softirq(). The use of the read lock makes this redundant (because we can safely re-enter the function). v8: * Fixed build on arm64 causes by a spurious include file in irq-gic.c. v7-2 (accidentally released twice with same number): * Fixed boot regression on vexpress-a9 (reported by Russell King). * Rebased on v3.18-rc3; removed one patch from set that is already included in mainline. * Dropped arm64/fiq.h patch from the set (still useful but not related to issuing backtraces). v7: * Re-arranged code within the patch series to fix a regression introduced midway through the series and corrected by a later patch (testing by Olof's autobuilder). Tested offending patch in isolation using defconfig identified by the autobuilder. v6: * Renamed svc_entry's call_trace argument to just trace (example code from Russell King). * Fixed mismatched ENDPROC() in __fiq_abt (example code from Russell King). * Modified usr_entry to optional avoid calling into the trace code and used this in FIQ entry from usr path. Modified corresponding exit code to avoid calling into trace code and the scheduler (example code from Russell King). * Ensured the default FIQ register state is restored when the default FIQ handler is reinstalled (example code from Russell King). * Renamed no_fiq_insn to dfl_fiq_insn to reflect the effect of adopting a default FIQ handler. * Re-instated fiq_safe_migration_lock and associated logic in gic_raise_softirq(). gic_raise_softirq() is called by wake_up_klogd() in the console unlock logic. v5: * Rebased on 3.17-rc4. * Removed a spurious line from the final "glue it together" patch that broke the build. v4: * Replaced push/pop with stmfd/ldmfd respectively (review of Nicolas Pitre). * Really fix bad pt_regs pointer generation in __fiq_abt. * Remove fiq_safe_migration_lock and associated logic in gic_raise_softirq() (review of Russell King) * Restructured to introduce the default FIQ handler first, before the new features (review of Russell King). v3: * Removed redundant header guards from arch/arm64/include/asm/fiq.h (review of Catalin Marinas). * Moved svc_exit_via_fiq macro to entry-header.S (review of Nicolas Pitre). v2: * Restructured to sit nicely on a similar FYI patchset from Russell King. It now effectively replaces the work in progress final patch with something much more complete. * Implemented (and tested) a Thumb-2 implementation of svc_exit_via_fiq (review of Nicolas Pitre) * Dropped the GIC group 0 workaround patch. The issue of FIQ interrupts being acknowledged by the IRQ handler does still exist but should be harmless because the IRQ handler will still wind up calling ipi_cpu_backtrace(). * Removed any dependency on CONFIG_FIQ; all cpu backtrace effectively becomes a platform feature (although the use of non-maskable interrupts to implement it is best effort rather than guaranteed). * Better comments highlighting usage of RAZ/WI registers (and parts of registers) in the GIC code. Changes *before* v1: * This patchset is a hugely cut-down successor to "[PATCH v11 00/19] arm: KGDB NMI/FIQ support". Thanks to Thomas Gleixner for suggesting the new structure. For historic details see: https://lkml.org/lkml/2014/9/2/227 * Fix bug in __fiq_abt (no longer passes a bad struct pt_regs value). In fixing this we also remove the useless indirection previously found in the fiq_handler macro. * Make default fiq handler "always on" by migrating from fiq.c to traps.c and replace do_unexp_fiq with the new handler (review of Russell King). * Add arm64 version of fiq.h (review of Russell King) * Removed conditional branching and code from irq-gic.c, this is replaced by much simpler code that relies on the GIC specification's heavy use of read-as-zero/write-ignored (review of Russell King) Daniel Thompson (8): irqchip: gic: Optimize locking in gic_raise_softirq irqchip: gic: Make gic_raise_softirq FIQ-safe irqchip: gic: Introduce plumbing for IPI FIQ sched_clock: Avoid deadlock during read from NMI printk: Simple implementation for NMI backtracing x86/nmi: Use common printk functions ARM: Add support for on-demand backtrace of other CPUs ARM: Fix on-demand backtrace triggered by IRQ arch/Kconfig | 3 + arch/arm/Kconfig | 1 + arch/arm/include/asm/hardirq.h | 2 +- arch/arm/include/asm/irq.h | 5 + arch/arm/include/asm/smp.h | 3 + arch/arm/kernel/smp.c | 81 ++++++++++++++++ arch/arm/kernel/traps.c | 8 +- arch/x86/Kconfig | 1 + arch/x86/kernel/apic/hw_nmi.c | 97 ++----------------- drivers/irqchip/irq-gic.c | 203 +++++++++++++++++++++++++++++++++++++--- include/linux/irqchip/arm-gic.h | 8 ++ include/linux/printk.h | 22 +++++ kernel/printk/printk.c | 122 ++++++++++++++++++++++++ kernel/time/sched_clock.c | 157 ++++++++++++++++++++----------- 14 files changed, 549 insertions(+), 164 deletions(-) -- 1.9.3

9 years, 1 month

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linaro-kernel February 2015