From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/powercap/idle_inject.c | 422 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 422 insertions(+) create mode 100644 drivers/powercap/idle_inject.c (limited to 'drivers/powercap/idle_inject.c') diff --git a/drivers/powercap/idle_inject.c b/drivers/powercap/idle_inject.c new file mode 100644 index 000000000..e18a2cc4e --- /dev/null +++ b/drivers/powercap/idle_inject.c @@ -0,0 +1,422 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2018 Linaro Limited + * + * Author: Daniel Lezcano + * + * The idle injection framework provides a way to force CPUs to enter idle + * states for a specified fraction of time over a specified period. + * + * It relies on the smpboot kthreads feature providing common code for CPU + * hotplug and thread [un]parking. + * + * All of the kthreads used for idle injection are created at init time. + * + * Next, the users of the idle injection framework provide a cpumask via + * its register function. The kthreads will be synchronized with respect to + * this cpumask. + * + * The idle + run duration is specified via separate helpers and that allows + * idle injection to be started. + * + * The idle injection kthreads will call play_idle_precise() with the idle + * duration and max allowed latency specified as per the above. + * + * After all of them have been woken up, a timer is set to start the next idle + * injection cycle. + * + * The timer interrupt handler will wake up the idle injection kthreads for + * all of the CPUs in the cpumask provided by the user. + * + * Idle injection is stopped synchronously and no leftover idle injection + * kthread activity after its completion is guaranteed. + * + * It is up to the user of this framework to provide a lock for higher-level + * synchronization to prevent race conditions like starting idle injection + * while unregistering from the framework. + */ +#define pr_fmt(fmt) "ii_dev: " fmt + +#include +#include +#include +#include +#include +#include +#include + +#include + +/** + * struct idle_inject_thread - task on/off switch structure + * @tsk: task injecting the idle cycles + * @should_run: whether or not to run the task (for the smpboot kthread API) + */ +struct idle_inject_thread { + struct task_struct *tsk; + int should_run; +}; + +/** + * struct idle_inject_device - idle injection data + * @timer: idle injection period timer + * @idle_duration_us: duration of CPU idle time to inject + * @run_duration_us: duration of CPU run time to allow + * @latency_us: max allowed latency + * @update: Optional callback deciding whether or not to skip idle + * injection in the given cycle. + * @cpumask: mask of CPUs affected by idle injection + * + * This structure is used to define per instance idle inject device data. Each + * instance has an idle duration, a run duration and mask of CPUs to inject + * idle. + * + * Actual CPU idle time is injected by calling kernel scheduler interface + * play_idle_precise(). There is one optional callback that can be registered + * by calling idle_inject_register_full(): + * + * update() - This callback is invoked just before waking up CPUs to inject + * idle. If it returns false, CPUs are not woken up to inject idle in the given + * cycle. It also allows the caller to readjust the idle and run duration by + * calling idle_inject_set_duration() for the next cycle. + */ +struct idle_inject_device { + struct hrtimer timer; + unsigned int idle_duration_us; + unsigned int run_duration_us; + unsigned int latency_us; + bool (*update)(void); + unsigned long cpumask[]; +}; + +static DEFINE_PER_CPU(struct idle_inject_thread, idle_inject_thread); +static DEFINE_PER_CPU(struct idle_inject_device *, idle_inject_device); + +/** + * idle_inject_wakeup - Wake up idle injection threads + * @ii_dev: target idle injection device + * + * Every idle injection task associated with the given idle injection device + * and running on an online CPU will be woken up. + */ +static void idle_inject_wakeup(struct idle_inject_device *ii_dev) +{ + struct idle_inject_thread *iit; + unsigned int cpu; + + for_each_cpu_and(cpu, to_cpumask(ii_dev->cpumask), cpu_online_mask) { + iit = per_cpu_ptr(&idle_inject_thread, cpu); + iit->should_run = 1; + wake_up_process(iit->tsk); + } +} + +/** + * idle_inject_timer_fn - idle injection timer function + * @timer: idle injection hrtimer + * + * This function is called when the idle injection timer expires. It wakes up + * idle injection tasks associated with the timer and they, in turn, invoke + * play_idle_precise() to inject a specified amount of CPU idle time. + * + * Return: HRTIMER_RESTART. + */ +static enum hrtimer_restart idle_inject_timer_fn(struct hrtimer *timer) +{ + unsigned int duration_us; + struct idle_inject_device *ii_dev = + container_of(timer, struct idle_inject_device, timer); + + if (!ii_dev->update || (ii_dev->update && ii_dev->update())) + idle_inject_wakeup(ii_dev); + + duration_us = READ_ONCE(ii_dev->run_duration_us); + duration_us += READ_ONCE(ii_dev->idle_duration_us); + + hrtimer_forward_now(timer, ns_to_ktime(duration_us * NSEC_PER_USEC)); + + return HRTIMER_RESTART; +} + +/** + * idle_inject_fn - idle injection work function + * @cpu: the CPU owning the task + * + * This function calls play_idle_precise() to inject a specified amount of CPU + * idle time. + */ +static void idle_inject_fn(unsigned int cpu) +{ + struct idle_inject_device *ii_dev; + struct idle_inject_thread *iit; + + ii_dev = per_cpu(idle_inject_device, cpu); + iit = per_cpu_ptr(&idle_inject_thread, cpu); + + /* + * Let the smpboot main loop know that the task should not run again. + */ + iit->should_run = 0; + + play_idle_precise(READ_ONCE(ii_dev->idle_duration_us) * NSEC_PER_USEC, + READ_ONCE(ii_dev->latency_us) * NSEC_PER_USEC); +} + +/** + * idle_inject_set_duration - idle and run duration update helper + * @ii_dev: idle injection control device structure + * @run_duration_us: CPU run time to allow in microseconds + * @idle_duration_us: CPU idle time to inject in microseconds + */ +void idle_inject_set_duration(struct idle_inject_device *ii_dev, + unsigned int run_duration_us, + unsigned int idle_duration_us) +{ + if (run_duration_us + idle_duration_us) { + WRITE_ONCE(ii_dev->run_duration_us, run_duration_us); + WRITE_ONCE(ii_dev->idle_duration_us, idle_duration_us); + } + if (!run_duration_us) + pr_debug("CPU is forced to 100 percent idle\n"); +} +EXPORT_SYMBOL_NS_GPL(idle_inject_set_duration, IDLE_INJECT); + +/** + * idle_inject_get_duration - idle and run duration retrieval helper + * @ii_dev: idle injection control device structure + * @run_duration_us: memory location to store the current CPU run time + * @idle_duration_us: memory location to store the current CPU idle time + */ +void idle_inject_get_duration(struct idle_inject_device *ii_dev, + unsigned int *run_duration_us, + unsigned int *idle_duration_us) +{ + *run_duration_us = READ_ONCE(ii_dev->run_duration_us); + *idle_duration_us = READ_ONCE(ii_dev->idle_duration_us); +} +EXPORT_SYMBOL_NS_GPL(idle_inject_get_duration, IDLE_INJECT); + +/** + * idle_inject_set_latency - set the maximum latency allowed + * @ii_dev: idle injection control device structure + * @latency_us: set the latency requirement for the idle state + */ +void idle_inject_set_latency(struct idle_inject_device *ii_dev, + unsigned int latency_us) +{ + WRITE_ONCE(ii_dev->latency_us, latency_us); +} +EXPORT_SYMBOL_NS_GPL(idle_inject_set_latency, IDLE_INJECT); + +/** + * idle_inject_start - start idle injections + * @ii_dev: idle injection control device structure + * + * The function starts idle injection by first waking up all of the idle + * injection kthreads associated with @ii_dev to let them inject CPU idle time + * sets up a timer to start the next idle injection period. + * + * Return: -EINVAL if the CPU idle or CPU run time is not set or 0 on success. + */ +int idle_inject_start(struct idle_inject_device *ii_dev) +{ + unsigned int idle_duration_us = READ_ONCE(ii_dev->idle_duration_us); + unsigned int run_duration_us = READ_ONCE(ii_dev->run_duration_us); + + if (!(idle_duration_us + run_duration_us)) + return -EINVAL; + + pr_debug("Starting injecting idle cycles on CPUs '%*pbl'\n", + cpumask_pr_args(to_cpumask(ii_dev->cpumask))); + + idle_inject_wakeup(ii_dev); + + hrtimer_start(&ii_dev->timer, + ns_to_ktime((idle_duration_us + run_duration_us) * + NSEC_PER_USEC), + HRTIMER_MODE_REL); + + return 0; +} +EXPORT_SYMBOL_NS_GPL(idle_inject_start, IDLE_INJECT); + +/** + * idle_inject_stop - stops idle injections + * @ii_dev: idle injection control device structure + * + * The function stops idle injection and waits for the threads to finish work. + * If CPU idle time is being injected when this function runs, then it will + * wait until the end of the cycle. + * + * When it returns, there is no more idle injection kthread activity. The + * kthreads are scheduled out and the periodic timer is off. + */ +void idle_inject_stop(struct idle_inject_device *ii_dev) +{ + struct idle_inject_thread *iit; + unsigned int cpu; + + pr_debug("Stopping idle injection on CPUs '%*pbl'\n", + cpumask_pr_args(to_cpumask(ii_dev->cpumask))); + + hrtimer_cancel(&ii_dev->timer); + + /* + * Stopping idle injection requires all of the idle injection kthreads + * associated with the given cpumask to be parked and stay that way, so + * prevent CPUs from going online at this point. Any CPUs going online + * after the loop below will be covered by clearing the should_run flag + * that will cause the smpboot main loop to schedule them out. + */ + cpu_hotplug_disable(); + + /* + * Iterate over all (online + offline) CPUs here in case one of them + * goes offline with the should_run flag set so as to prevent its idle + * injection kthread from running when the CPU goes online again after + * the ii_dev has been freed. + */ + for_each_cpu(cpu, to_cpumask(ii_dev->cpumask)) { + iit = per_cpu_ptr(&idle_inject_thread, cpu); + iit->should_run = 0; + + wait_task_inactive(iit->tsk, TASK_ANY); + } + + cpu_hotplug_enable(); +} +EXPORT_SYMBOL_NS_GPL(idle_inject_stop, IDLE_INJECT); + +/** + * idle_inject_setup - prepare the current task for idle injection + * @cpu: not used + * + * Called once, this function is in charge of setting the current task's + * scheduler parameters to make it an RT task. + */ +static void idle_inject_setup(unsigned int cpu) +{ + sched_set_fifo(current); +} + +/** + * idle_inject_should_run - function helper for the smpboot API + * @cpu: CPU the kthread is running on + * + * Return: whether or not the thread can run. + */ +static int idle_inject_should_run(unsigned int cpu) +{ + struct idle_inject_thread *iit = + per_cpu_ptr(&idle_inject_thread, cpu); + + return iit->should_run; +} + +/** + * idle_inject_register_full - initialize idle injection on a set of CPUs + * @cpumask: CPUs to be affected by idle injection + * @update: This callback is called just before waking up CPUs to inject + * idle + * + * This function creates an idle injection control device structure for the + * given set of CPUs and initializes the timer associated with it. This + * function also allows to register update()callback. + * It does not start any injection cycles. + * + * Return: NULL if memory allocation fails, idle injection control device + * pointer on success. + */ + +struct idle_inject_device *idle_inject_register_full(struct cpumask *cpumask, + bool (*update)(void)) +{ + struct idle_inject_device *ii_dev; + int cpu, cpu_rb; + + ii_dev = kzalloc(sizeof(*ii_dev) + cpumask_size(), GFP_KERNEL); + if (!ii_dev) + return NULL; + + cpumask_copy(to_cpumask(ii_dev->cpumask), cpumask); + hrtimer_init(&ii_dev->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + ii_dev->timer.function = idle_inject_timer_fn; + ii_dev->latency_us = UINT_MAX; + ii_dev->update = update; + + for_each_cpu(cpu, to_cpumask(ii_dev->cpumask)) { + + if (per_cpu(idle_inject_device, cpu)) { + pr_err("cpu%d is already registered\n", cpu); + goto out_rollback; + } + + per_cpu(idle_inject_device, cpu) = ii_dev; + } + + return ii_dev; + +out_rollback: + for_each_cpu(cpu_rb, to_cpumask(ii_dev->cpumask)) { + if (cpu == cpu_rb) + break; + per_cpu(idle_inject_device, cpu_rb) = NULL; + } + + kfree(ii_dev); + + return NULL; +} +EXPORT_SYMBOL_NS_GPL(idle_inject_register_full, IDLE_INJECT); + +/** + * idle_inject_register - initialize idle injection on a set of CPUs + * @cpumask: CPUs to be affected by idle injection + * + * This function creates an idle injection control device structure for the + * given set of CPUs and initializes the timer associated with it. It does not + * start any injection cycles. + * + * Return: NULL if memory allocation fails, idle injection control device + * pointer on success. + */ +struct idle_inject_device *idle_inject_register(struct cpumask *cpumask) +{ + return idle_inject_register_full(cpumask, NULL); +} +EXPORT_SYMBOL_NS_GPL(idle_inject_register, IDLE_INJECT); + +/** + * idle_inject_unregister - unregister idle injection control device + * @ii_dev: idle injection control device to unregister + * + * The function stops idle injection for the given control device, + * unregisters its kthreads and frees memory allocated when that device was + * created. + */ +void idle_inject_unregister(struct idle_inject_device *ii_dev) +{ + unsigned int cpu; + + idle_inject_stop(ii_dev); + + for_each_cpu(cpu, to_cpumask(ii_dev->cpumask)) + per_cpu(idle_inject_device, cpu) = NULL; + + kfree(ii_dev); +} +EXPORT_SYMBOL_NS_GPL(idle_inject_unregister, IDLE_INJECT); + +static struct smp_hotplug_thread idle_inject_threads = { + .store = &idle_inject_thread.tsk, + .setup = idle_inject_setup, + .thread_fn = idle_inject_fn, + .thread_comm = "idle_inject/%u", + .thread_should_run = idle_inject_should_run, +}; + +static int __init idle_inject_init(void) +{ + return smpboot_register_percpu_thread(&idle_inject_threads); +} +early_initcall(idle_inject_init); -- cgit v1.2.3