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authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
committerLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
commit5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch)
treecc5c2d0a898769fd59549594fedb3ee6f84e59a0 /drivers/watchdog/scx200_wdt.c
downloadlinux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz
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Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
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(). ...
Diffstat (limited to 'drivers/watchdog/scx200_wdt.c')
-rw-r--r--drivers/watchdog/scx200_wdt.c263
1 files changed, 263 insertions, 0 deletions
diff --git a/drivers/watchdog/scx200_wdt.c b/drivers/watchdog/scx200_wdt.c
new file mode 100644
index 000000000..7b5e18323
--- /dev/null
+++ b/drivers/watchdog/scx200_wdt.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* drivers/char/watchdog/scx200_wdt.c
+
+ National Semiconductor SCx200 Watchdog support
+
+ Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
+
+ Some code taken from:
+ National Semiconductor PC87307/PC97307 (ala SC1200) WDT driver
+ (c) Copyright 2002 Zwane Mwaikambo <zwane@commfireservices.com>
+
+
+ The author(s) of this software shall not be held liable for damages
+ of any nature resulting due to the use of this software. This
+ software is provided AS-IS with no warranties. */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/fs.h>
+#include <linux/ioport.h>
+#include <linux/scx200.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+
+#define DEBUG
+
+MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
+MODULE_DESCRIPTION("NatSemi SCx200 Watchdog Driver");
+MODULE_LICENSE("GPL");
+
+static int margin = 60; /* in seconds */
+module_param(margin, int, 0);
+MODULE_PARM_DESC(margin, "Watchdog margin in seconds");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
+
+static u16 wdto_restart;
+static char expect_close;
+static unsigned long open_lock;
+static DEFINE_SPINLOCK(scx_lock);
+
+/* Bits of the WDCNFG register */
+#define W_ENABLE 0x00fa /* Enable watchdog */
+#define W_DISABLE 0x0000 /* Disable watchdog */
+
+/* The scaling factor for the timer, this depends on the value of W_ENABLE */
+#define W_SCALE (32768/1024)
+
+static void scx200_wdt_ping(void)
+{
+ spin_lock(&scx_lock);
+ outw(wdto_restart, scx200_cb_base + SCx200_WDT_WDTO);
+ spin_unlock(&scx_lock);
+}
+
+static void scx200_wdt_update_margin(void)
+{
+ pr_info("timer margin %d seconds\n", margin);
+ wdto_restart = margin * W_SCALE;
+}
+
+static void scx200_wdt_enable(void)
+{
+ pr_debug("enabling watchdog timer, wdto_restart = %d\n", wdto_restart);
+
+ spin_lock(&scx_lock);
+ outw(0, scx200_cb_base + SCx200_WDT_WDTO);
+ outb(SCx200_WDT_WDSTS_WDOVF, scx200_cb_base + SCx200_WDT_WDSTS);
+ outw(W_ENABLE, scx200_cb_base + SCx200_WDT_WDCNFG);
+ spin_unlock(&scx_lock);
+
+ scx200_wdt_ping();
+}
+
+static void scx200_wdt_disable(void)
+{
+ pr_debug("disabling watchdog timer\n");
+
+ spin_lock(&scx_lock);
+ outw(0, scx200_cb_base + SCx200_WDT_WDTO);
+ outb(SCx200_WDT_WDSTS_WDOVF, scx200_cb_base + SCx200_WDT_WDSTS);
+ outw(W_DISABLE, scx200_cb_base + SCx200_WDT_WDCNFG);
+ spin_unlock(&scx_lock);
+}
+
+static int scx200_wdt_open(struct inode *inode, struct file *file)
+{
+ /* only allow one at a time */
+ if (test_and_set_bit(0, &open_lock))
+ return -EBUSY;
+ scx200_wdt_enable();
+
+ return stream_open(inode, file);
+}
+
+static int scx200_wdt_release(struct inode *inode, struct file *file)
+{
+ if (expect_close != 42)
+ pr_warn("watchdog device closed unexpectedly, will not disable the watchdog timer\n");
+ else if (!nowayout)
+ scx200_wdt_disable();
+ expect_close = 0;
+ clear_bit(0, &open_lock);
+
+ return 0;
+}
+
+static int scx200_wdt_notify_sys(struct notifier_block *this,
+ unsigned long code, void *unused)
+{
+ if (code == SYS_HALT || code == SYS_POWER_OFF)
+ if (!nowayout)
+ scx200_wdt_disable();
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block scx200_wdt_notifier = {
+ .notifier_call = scx200_wdt_notify_sys,
+};
+
+static ssize_t scx200_wdt_write(struct file *file, const char __user *data,
+ size_t len, loff_t *ppos)
+{
+ /* check for a magic close character */
+ if (len) {
+ size_t i;
+
+ scx200_wdt_ping();
+
+ expect_close = 0;
+ for (i = 0; i < len; ++i) {
+ char c;
+ if (get_user(c, data + i))
+ return -EFAULT;
+ if (c == 'V')
+ expect_close = 42;
+ }
+
+ return len;
+ }
+
+ return 0;
+}
+
+static long scx200_wdt_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ int __user *p = argp;
+ static const struct watchdog_info ident = {
+ .identity = "NatSemi SCx200 Watchdog",
+ .firmware_version = 1,
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE,
+ };
+ int new_margin;
+
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ if (copy_to_user(argp, &ident, sizeof(ident)))
+ return -EFAULT;
+ return 0;
+ case WDIOC_GETSTATUS:
+ case WDIOC_GETBOOTSTATUS:
+ if (put_user(0, p))
+ return -EFAULT;
+ return 0;
+ case WDIOC_KEEPALIVE:
+ scx200_wdt_ping();
+ return 0;
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_margin, p))
+ return -EFAULT;
+ if (new_margin < 1)
+ return -EINVAL;
+ margin = new_margin;
+ scx200_wdt_update_margin();
+ scx200_wdt_ping();
+ fallthrough;
+ case WDIOC_GETTIMEOUT:
+ if (put_user(margin, p))
+ return -EFAULT;
+ return 0;
+ default:
+ return -ENOTTY;
+ }
+}
+
+static const struct file_operations scx200_wdt_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = scx200_wdt_write,
+ .unlocked_ioctl = scx200_wdt_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+ .open = scx200_wdt_open,
+ .release = scx200_wdt_release,
+};
+
+static struct miscdevice scx200_wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &scx200_wdt_fops,
+};
+
+static int __init scx200_wdt_init(void)
+{
+ int r;
+
+ pr_debug("NatSemi SCx200 Watchdog Driver\n");
+
+ /* check that we have found the configuration block */
+ if (!scx200_cb_present())
+ return -ENODEV;
+
+ if (!request_region(scx200_cb_base + SCx200_WDT_OFFSET,
+ SCx200_WDT_SIZE,
+ "NatSemi SCx200 Watchdog")) {
+ pr_warn("watchdog I/O region busy\n");
+ return -EBUSY;
+ }
+
+ scx200_wdt_update_margin();
+ scx200_wdt_disable();
+
+ r = register_reboot_notifier(&scx200_wdt_notifier);
+ if (r) {
+ pr_err("unable to register reboot notifier\n");
+ release_region(scx200_cb_base + SCx200_WDT_OFFSET,
+ SCx200_WDT_SIZE);
+ return r;
+ }
+
+ r = misc_register(&scx200_wdt_miscdev);
+ if (r) {
+ unregister_reboot_notifier(&scx200_wdt_notifier);
+ release_region(scx200_cb_base + SCx200_WDT_OFFSET,
+ SCx200_WDT_SIZE);
+ return r;
+ }
+
+ return 0;
+}
+
+static void __exit scx200_wdt_cleanup(void)
+{
+ misc_deregister(&scx200_wdt_miscdev);
+ unregister_reboot_notifier(&scx200_wdt_notifier);
+ release_region(scx200_cb_base + SCx200_WDT_OFFSET,
+ SCx200_WDT_SIZE);
+}
+
+module_init(scx200_wdt_init);
+module_exit(scx200_wdt_cleanup);