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/power/reset/ltc2952-poweroff.c | 320 +++++++++++++++++++++++++++++++++ 1 file changed, 320 insertions(+) create mode 100644 drivers/power/reset/ltc2952-poweroff.c (limited to 'drivers/power/reset/ltc2952-poweroff.c') diff --git a/drivers/power/reset/ltc2952-poweroff.c b/drivers/power/reset/ltc2952-poweroff.c new file mode 100644 index 000000000..65d9528cc --- /dev/null +++ b/drivers/power/reset/ltc2952-poweroff.c @@ -0,0 +1,320 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * LTC2952 (PowerPath) driver + * + * Copyright (C) 2014, Xsens Technologies BV + * Maintainer: René Moll + * + * ---------------------------------------- + * - Description + * ---------------------------------------- + * + * This driver is to be used with an external PowerPath Controller (LTC2952). + * Its function is to determine when a external shut down is triggered + * and react by properly shutting down the system. + * + * This driver expects a device tree with a ltc2952 entry for pin mapping. + * + * ---------------------------------------- + * - GPIO + * ---------------------------------------- + * + * The following GPIOs are used: + * - trigger (input) + * A level change indicates the shut-down trigger. If it's state reverts + * within the time-out defined by trigger_delay, the shut down is not + * executed. If no pin is assigned to this input, the driver will start the + * watchdog toggle immediately. The chip will only power off the system if + * it is requested to do so through the kill line. + * + * - watchdog (output) + * Once a shut down is triggered, the driver will toggle this signal, + * with an internal (wde_interval) to stall the hardware shut down. + * + * - kill (output) + * The last action during shut down is triggering this signalling, such + * that the PowerPath Control will power down the hardware. + * + * ---------------------------------------- + * - Interrupts + * ---------------------------------------- + * + * The driver requires a non-shared, edge-triggered interrupt on the trigger + * GPIO. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct ltc2952_poweroff { + struct hrtimer timer_trigger; + struct hrtimer timer_wde; + + ktime_t trigger_delay; + ktime_t wde_interval; + + struct device *dev; + + struct gpio_desc *gpio_trigger; + struct gpio_desc *gpio_watchdog; + struct gpio_desc *gpio_kill; + + bool kernel_panic; + struct notifier_block panic_notifier; +}; + +#define to_ltc2952(p, m) container_of(p, struct ltc2952_poweroff, m) + +/* + * This global variable is only needed for pm_power_off. We should + * remove it entirely once we don't need the global state anymore. + */ +static struct ltc2952_poweroff *ltc2952_data; + +/** + * ltc2952_poweroff_timer_wde - Timer callback + * Toggles the watchdog reset signal each wde_interval + * + * @timer: corresponding timer + * + * Returns HRTIMER_RESTART for an infinite loop which will only stop when the + * machine actually shuts down + */ +static enum hrtimer_restart ltc2952_poweroff_timer_wde(struct hrtimer *timer) +{ + int state; + struct ltc2952_poweroff *data = to_ltc2952(timer, timer_wde); + + if (data->kernel_panic) + return HRTIMER_NORESTART; + + state = gpiod_get_value(data->gpio_watchdog); + gpiod_set_value(data->gpio_watchdog, !state); + + hrtimer_forward_now(timer, data->wde_interval); + + return HRTIMER_RESTART; +} + +static void ltc2952_poweroff_start_wde(struct ltc2952_poweroff *data) +{ + hrtimer_start(&data->timer_wde, data->wde_interval, HRTIMER_MODE_REL); +} + +static enum hrtimer_restart +ltc2952_poweroff_timer_trigger(struct hrtimer *timer) +{ + struct ltc2952_poweroff *data = to_ltc2952(timer, timer_trigger); + + ltc2952_poweroff_start_wde(data); + dev_info(data->dev, "executing shutdown\n"); + orderly_poweroff(true); + + return HRTIMER_NORESTART; +} + +/** + * ltc2952_poweroff_handler - Interrupt handler + * Triggered each time the trigger signal changes state and (de)activates a + * time-out (timer_trigger). Once the time-out is actually reached the shut + * down is executed. + * + * @irq: IRQ number + * @dev_id: pointer to the main data structure + */ +static irqreturn_t ltc2952_poweroff_handler(int irq, void *dev_id) +{ + struct ltc2952_poweroff *data = dev_id; + + if (data->kernel_panic || hrtimer_active(&data->timer_wde)) { + /* shutdown is already triggered, nothing to do any more */ + return IRQ_HANDLED; + } + + if (gpiod_get_value(data->gpio_trigger)) { + hrtimer_start(&data->timer_trigger, data->trigger_delay, + HRTIMER_MODE_REL); + } else { + hrtimer_cancel(&data->timer_trigger); + } + return IRQ_HANDLED; +} + +static void ltc2952_poweroff_kill(void) +{ + gpiod_set_value(ltc2952_data->gpio_kill, 1); +} + +static void ltc2952_poweroff_default(struct ltc2952_poweroff *data) +{ + data->wde_interval = 300L * NSEC_PER_MSEC; + data->trigger_delay = ktime_set(2, 500L * NSEC_PER_MSEC); + + hrtimer_init(&data->timer_trigger, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + data->timer_trigger.function = ltc2952_poweroff_timer_trigger; + + hrtimer_init(&data->timer_wde, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + data->timer_wde.function = ltc2952_poweroff_timer_wde; +} + +static int ltc2952_poweroff_init(struct platform_device *pdev) +{ + int ret; + u32 trigger_delay_ms; + struct ltc2952_poweroff *data = platform_get_drvdata(pdev); + + ltc2952_poweroff_default(data); + + if (!device_property_read_u32(&pdev->dev, "trigger-delay-ms", + &trigger_delay_ms)) { + data->trigger_delay = ktime_set(trigger_delay_ms / MSEC_PER_SEC, + (trigger_delay_ms % MSEC_PER_SEC) * NSEC_PER_MSEC); + } + + data->gpio_watchdog = devm_gpiod_get(&pdev->dev, "watchdog", + GPIOD_OUT_LOW); + if (IS_ERR(data->gpio_watchdog)) { + ret = PTR_ERR(data->gpio_watchdog); + dev_err(&pdev->dev, "unable to claim gpio \"watchdog\"\n"); + return ret; + } + + data->gpio_kill = devm_gpiod_get(&pdev->dev, "kill", GPIOD_OUT_LOW); + if (IS_ERR(data->gpio_kill)) { + ret = PTR_ERR(data->gpio_kill); + dev_err(&pdev->dev, "unable to claim gpio \"kill\"\n"); + return ret; + } + + data->gpio_trigger = devm_gpiod_get_optional(&pdev->dev, "trigger", + GPIOD_IN); + if (IS_ERR(data->gpio_trigger)) { + /* + * It's not a problem if the trigger gpio isn't available, but + * it is worth a warning if its use was defined in the device + * tree. + */ + dev_err(&pdev->dev, "unable to claim gpio \"trigger\"\n"); + data->gpio_trigger = NULL; + } + + if (devm_request_irq(&pdev->dev, gpiod_to_irq(data->gpio_trigger), + ltc2952_poweroff_handler, + (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING), + "ltc2952-poweroff", + data)) { + /* + * Some things may have happened: + * - No trigger input was defined + * - Claiming the GPIO failed + * - We could not map to an IRQ + * - We couldn't register an interrupt handler + * + * None of these really are problems, but all of them + * disqualify the push button from controlling the power. + * + * It is therefore important to note that if the ltc2952 + * detects a button press for long enough, it will still start + * its own powerdown window and cut the power on us if we don't + * start the watchdog trigger. + */ + if (data->gpio_trigger) { + dev_warn(&pdev->dev, + "unable to configure the trigger interrupt\n"); + devm_gpiod_put(&pdev->dev, data->gpio_trigger); + data->gpio_trigger = NULL; + } + dev_info(&pdev->dev, + "power down trigger input will not be used\n"); + ltc2952_poweroff_start_wde(data); + } + + return 0; +} + +static int ltc2952_poweroff_notify_panic(struct notifier_block *nb, + unsigned long code, void *unused) +{ + struct ltc2952_poweroff *data = to_ltc2952(nb, panic_notifier); + + data->kernel_panic = true; + return NOTIFY_DONE; +} + +static int ltc2952_poweroff_probe(struct platform_device *pdev) +{ + int ret; + struct ltc2952_poweroff *data; + + if (pm_power_off) { + dev_err(&pdev->dev, "pm_power_off already registered"); + return -EBUSY; + } + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->dev = &pdev->dev; + platform_set_drvdata(pdev, data); + + ret = ltc2952_poweroff_init(pdev); + if (ret) + return ret; + + /* TODO: remove ltc2952_data */ + ltc2952_data = data; + pm_power_off = ltc2952_poweroff_kill; + + data->panic_notifier.notifier_call = ltc2952_poweroff_notify_panic; + atomic_notifier_chain_register(&panic_notifier_list, + &data->panic_notifier); + dev_info(&pdev->dev, "probe successful\n"); + + return 0; +} + +static int ltc2952_poweroff_remove(struct platform_device *pdev) +{ + struct ltc2952_poweroff *data = platform_get_drvdata(pdev); + + pm_power_off = NULL; + hrtimer_cancel(&data->timer_trigger); + hrtimer_cancel(&data->timer_wde); + atomic_notifier_chain_unregister(&panic_notifier_list, + &data->panic_notifier); + return 0; +} + +static const struct of_device_id of_ltc2952_poweroff_match[] = { + { .compatible = "lltc,ltc2952"}, + {}, +}; +MODULE_DEVICE_TABLE(of, of_ltc2952_poweroff_match); + +static struct platform_driver ltc2952_poweroff_driver = { + .probe = ltc2952_poweroff_probe, + .remove = ltc2952_poweroff_remove, + .driver = { + .name = "ltc2952-poweroff", + .of_match_table = of_ltc2952_poweroff_match, + }, +}; + +module_platform_driver(ltc2952_poweroff_driver); + +MODULE_AUTHOR("René Moll "); +MODULE_DESCRIPTION("LTC PowerPath power-off driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3