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/watchdog/apple_wdt.c | 226 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 226 insertions(+) create mode 100644 drivers/watchdog/apple_wdt.c (limited to 'drivers/watchdog/apple_wdt.c') diff --git a/drivers/watchdog/apple_wdt.c b/drivers/watchdog/apple_wdt.c new file mode 100644 index 000000000..16aca21f1 --- /dev/null +++ b/drivers/watchdog/apple_wdt.c @@ -0,0 +1,226 @@ +// SPDX-License-Identifier: GPL-2.0-only OR MIT +/* + * Apple SoC Watchdog driver + * + * Copyright (C) The Asahi Linux Contributors + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * Apple Watchdog MMIO registers + * + * This HW block has three separate watchdogs. WD0 resets the machine + * to recovery mode and is not very useful for us. WD1 and WD2 trigger a normal + * machine reset. WD0 additionally supports a configurable interrupt. + * This information can be used to implement pretimeout support at a later time. + * + * APPLE_WDT_WDx_CUR_TIME is a simple counter incremented for each tick of the + * reference clock. It can also be overwritten to any value. + * Whenever APPLE_WDT_CTRL_RESET_EN is set in APPLE_WDT_WDx_CTRL and + * APPLE_WDT_WDx_CUR_TIME >= APPLE_WDT_WDx_BITE_TIME the entire machine is + * reset. + * Whenever APPLE_WDT_CTRL_IRQ_EN is set and APPLE_WDTx_WD1_CUR_TIME >= + * APPLE_WDTx_WD1_BARK_TIME an interrupt is triggered and + * APPLE_WDT_CTRL_IRQ_STATUS is set. The interrupt can be cleared by writing + * 1 to APPLE_WDT_CTRL_IRQ_STATUS. + */ +#define APPLE_WDT_WD0_CUR_TIME 0x00 +#define APPLE_WDT_WD0_BITE_TIME 0x04 +#define APPLE_WDT_WD0_BARK_TIME 0x08 +#define APPLE_WDT_WD0_CTRL 0x0c + +#define APPLE_WDT_WD1_CUR_TIME 0x10 +#define APPLE_WDT_WD1_BITE_TIME 0x14 +#define APPLE_WDT_WD1_CTRL 0x1c + +#define APPLE_WDT_WD2_CUR_TIME 0x20 +#define APPLE_WDT_WD2_BITE_TIME 0x24 +#define APPLE_WDT_WD2_CTRL 0x2c + +#define APPLE_WDT_CTRL_IRQ_EN BIT(0) +#define APPLE_WDT_CTRL_IRQ_STATUS BIT(1) +#define APPLE_WDT_CTRL_RESET_EN BIT(2) + +#define APPLE_WDT_TIMEOUT_DEFAULT 30 + +struct apple_wdt { + struct watchdog_device wdd; + void __iomem *regs; + unsigned long clk_rate; +}; + +static struct apple_wdt *to_apple_wdt(struct watchdog_device *wdd) +{ + return container_of(wdd, struct apple_wdt, wdd); +} + +static int apple_wdt_start(struct watchdog_device *wdd) +{ + struct apple_wdt *wdt = to_apple_wdt(wdd); + + writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_CUR_TIME); + writel_relaxed(APPLE_WDT_CTRL_RESET_EN, wdt->regs + APPLE_WDT_WD1_CTRL); + + return 0; +} + +static int apple_wdt_stop(struct watchdog_device *wdd) +{ + struct apple_wdt *wdt = to_apple_wdt(wdd); + + writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_CTRL); + + return 0; +} + +static int apple_wdt_ping(struct watchdog_device *wdd) +{ + struct apple_wdt *wdt = to_apple_wdt(wdd); + + writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_CUR_TIME); + + return 0; +} + +static int apple_wdt_set_timeout(struct watchdog_device *wdd, unsigned int s) +{ + struct apple_wdt *wdt = to_apple_wdt(wdd); + + writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_CUR_TIME); + writel_relaxed(wdt->clk_rate * s, wdt->regs + APPLE_WDT_WD1_BITE_TIME); + + wdd->timeout = s; + + return 0; +} + +static unsigned int apple_wdt_get_timeleft(struct watchdog_device *wdd) +{ + struct apple_wdt *wdt = to_apple_wdt(wdd); + u32 cur_time, reset_time; + + cur_time = readl_relaxed(wdt->regs + APPLE_WDT_WD1_CUR_TIME); + reset_time = readl_relaxed(wdt->regs + APPLE_WDT_WD1_BITE_TIME); + + return (reset_time - cur_time) / wdt->clk_rate; +} + +static int apple_wdt_restart(struct watchdog_device *wdd, unsigned long mode, + void *cmd) +{ + struct apple_wdt *wdt = to_apple_wdt(wdd); + + writel_relaxed(APPLE_WDT_CTRL_RESET_EN, wdt->regs + APPLE_WDT_WD1_CTRL); + writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_BITE_TIME); + writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_CUR_TIME); + + /* + * Flush writes and then wait for the SoC to reset. Even though the + * reset is queued almost immediately experiments have shown that it + * can take up to ~20-25ms until the SoC is actually reset. Just wait + * 50ms here to be safe. + */ + (void)readl_relaxed(wdt->regs + APPLE_WDT_WD1_CUR_TIME); + mdelay(50); + + return 0; +} + +static void apple_wdt_clk_disable_unprepare(void *data) +{ + clk_disable_unprepare(data); +} + +static struct watchdog_ops apple_wdt_ops = { + .owner = THIS_MODULE, + .start = apple_wdt_start, + .stop = apple_wdt_stop, + .ping = apple_wdt_ping, + .set_timeout = apple_wdt_set_timeout, + .get_timeleft = apple_wdt_get_timeleft, + .restart = apple_wdt_restart, +}; + +static struct watchdog_info apple_wdt_info = { + .identity = "Apple SoC Watchdog", + .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT, +}; + +static int apple_wdt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct apple_wdt *wdt; + struct clk *clk; + u32 wdt_ctrl; + int ret; + + wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); + if (!wdt) + return -ENOMEM; + + wdt->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(wdt->regs)) + return PTR_ERR(wdt->regs); + + clk = devm_clk_get(dev, NULL); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + ret = clk_prepare_enable(clk); + if (ret) + return ret; + + ret = devm_add_action_or_reset(dev, apple_wdt_clk_disable_unprepare, + clk); + if (ret) + return ret; + + wdt->clk_rate = clk_get_rate(clk); + if (!wdt->clk_rate) + return -EINVAL; + + wdt->wdd.ops = &apple_wdt_ops; + wdt->wdd.info = &apple_wdt_info; + wdt->wdd.max_timeout = U32_MAX / wdt->clk_rate; + wdt->wdd.timeout = APPLE_WDT_TIMEOUT_DEFAULT; + + wdt_ctrl = readl_relaxed(wdt->regs + APPLE_WDT_WD1_CTRL); + if (wdt_ctrl & APPLE_WDT_CTRL_RESET_EN) + set_bit(WDOG_HW_RUNNING, &wdt->wdd.status); + + watchdog_init_timeout(&wdt->wdd, 0, dev); + apple_wdt_set_timeout(&wdt->wdd, wdt->wdd.timeout); + watchdog_stop_on_unregister(&wdt->wdd); + watchdog_set_restart_priority(&wdt->wdd, 128); + + return devm_watchdog_register_device(dev, &wdt->wdd); +} + +static const struct of_device_id apple_wdt_of_match[] = { + { .compatible = "apple,wdt" }, + {}, +}; +MODULE_DEVICE_TABLE(of, apple_wdt_of_match); + +static struct platform_driver apple_wdt_driver = { + .driver = { + .name = "apple-watchdog", + .of_match_table = apple_wdt_of_match, + }, + .probe = apple_wdt_probe, +}; +module_platform_driver(apple_wdt_driver); + +MODULE_DESCRIPTION("Apple SoC watchdog driver"); +MODULE_AUTHOR("Sven Peter "); +MODULE_LICENSE("Dual MIT/GPL"); -- cgit v1.2.3