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(). ... --- arch/arm64/kernel/debug-monitors.c | 455 +++++++++++++++++++++++++++++++++++++ 1 file changed, 455 insertions(+) create mode 100644 arch/arm64/kernel/debug-monitors.c (limited to 'arch/arm64/kernel/debug-monitors.c') diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c new file mode 100644 index 000000000..3da097782 --- /dev/null +++ b/arch/arm64/kernel/debug-monitors.c @@ -0,0 +1,455 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ARMv8 single-step debug support and mdscr context switching. + * + * Copyright (C) 2012 ARM Limited + * + * Author: Will Deacon + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +/* Determine debug architecture. */ +u8 debug_monitors_arch(void) +{ + return cpuid_feature_extract_unsigned_field(read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1), + ID_AA64DFR0_EL1_DebugVer_SHIFT); +} + +/* + * MDSCR access routines. + */ +static void mdscr_write(u32 mdscr) +{ + unsigned long flags; + flags = local_daif_save(); + write_sysreg(mdscr, mdscr_el1); + local_daif_restore(flags); +} +NOKPROBE_SYMBOL(mdscr_write); + +static u32 mdscr_read(void) +{ + return read_sysreg(mdscr_el1); +} +NOKPROBE_SYMBOL(mdscr_read); + +/* + * Allow root to disable self-hosted debug from userspace. + * This is useful if you want to connect an external JTAG debugger. + */ +static bool debug_enabled = true; + +static int create_debug_debugfs_entry(void) +{ + debugfs_create_bool("debug_enabled", 0644, NULL, &debug_enabled); + return 0; +} +fs_initcall(create_debug_debugfs_entry); + +static int __init early_debug_disable(char *buf) +{ + debug_enabled = false; + return 0; +} + +early_param("nodebugmon", early_debug_disable); + +/* + * Keep track of debug users on each core. + * The ref counts are per-cpu so we use a local_t type. + */ +static DEFINE_PER_CPU(int, mde_ref_count); +static DEFINE_PER_CPU(int, kde_ref_count); + +void enable_debug_monitors(enum dbg_active_el el) +{ + u32 mdscr, enable = 0; + + WARN_ON(preemptible()); + + if (this_cpu_inc_return(mde_ref_count) == 1) + enable = DBG_MDSCR_MDE; + + if (el == DBG_ACTIVE_EL1 && + this_cpu_inc_return(kde_ref_count) == 1) + enable |= DBG_MDSCR_KDE; + + if (enable && debug_enabled) { + mdscr = mdscr_read(); + mdscr |= enable; + mdscr_write(mdscr); + } +} +NOKPROBE_SYMBOL(enable_debug_monitors); + +void disable_debug_monitors(enum dbg_active_el el) +{ + u32 mdscr, disable = 0; + + WARN_ON(preemptible()); + + if (this_cpu_dec_return(mde_ref_count) == 0) + disable = ~DBG_MDSCR_MDE; + + if (el == DBG_ACTIVE_EL1 && + this_cpu_dec_return(kde_ref_count) == 0) + disable &= ~DBG_MDSCR_KDE; + + if (disable) { + mdscr = mdscr_read(); + mdscr &= disable; + mdscr_write(mdscr); + } +} +NOKPROBE_SYMBOL(disable_debug_monitors); + +/* + * OS lock clearing. + */ +static int clear_os_lock(unsigned int cpu) +{ + write_sysreg(0, osdlr_el1); + write_sysreg(0, oslar_el1); + isb(); + return 0; +} + +static int __init debug_monitors_init(void) +{ + return cpuhp_setup_state(CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING, + "arm64/debug_monitors:starting", + clear_os_lock, NULL); +} +postcore_initcall(debug_monitors_init); + +/* + * Single step API and exception handling. + */ +static void set_user_regs_spsr_ss(struct user_pt_regs *regs) +{ + regs->pstate |= DBG_SPSR_SS; +} +NOKPROBE_SYMBOL(set_user_regs_spsr_ss); + +static void clear_user_regs_spsr_ss(struct user_pt_regs *regs) +{ + regs->pstate &= ~DBG_SPSR_SS; +} +NOKPROBE_SYMBOL(clear_user_regs_spsr_ss); + +#define set_regs_spsr_ss(r) set_user_regs_spsr_ss(&(r)->user_regs) +#define clear_regs_spsr_ss(r) clear_user_regs_spsr_ss(&(r)->user_regs) + +static DEFINE_SPINLOCK(debug_hook_lock); +static LIST_HEAD(user_step_hook); +static LIST_HEAD(kernel_step_hook); + +static void register_debug_hook(struct list_head *node, struct list_head *list) +{ + spin_lock(&debug_hook_lock); + list_add_rcu(node, list); + spin_unlock(&debug_hook_lock); + +} + +static void unregister_debug_hook(struct list_head *node) +{ + spin_lock(&debug_hook_lock); + list_del_rcu(node); + spin_unlock(&debug_hook_lock); + synchronize_rcu(); +} + +void register_user_step_hook(struct step_hook *hook) +{ + register_debug_hook(&hook->node, &user_step_hook); +} + +void unregister_user_step_hook(struct step_hook *hook) +{ + unregister_debug_hook(&hook->node); +} + +void register_kernel_step_hook(struct step_hook *hook) +{ + register_debug_hook(&hook->node, &kernel_step_hook); +} + +void unregister_kernel_step_hook(struct step_hook *hook) +{ + unregister_debug_hook(&hook->node); +} + +/* + * Call registered single step handlers + * There is no Syndrome info to check for determining the handler. + * So we call all the registered handlers, until the right handler is + * found which returns zero. + */ +static int call_step_hook(struct pt_regs *regs, unsigned long esr) +{ + struct step_hook *hook; + struct list_head *list; + int retval = DBG_HOOK_ERROR; + + list = user_mode(regs) ? &user_step_hook : &kernel_step_hook; + + /* + * Since single-step exception disables interrupt, this function is + * entirely not preemptible, and we can use rcu list safely here. + */ + list_for_each_entry_rcu(hook, list, node) { + retval = hook->fn(regs, esr); + if (retval == DBG_HOOK_HANDLED) + break; + } + + return retval; +} +NOKPROBE_SYMBOL(call_step_hook); + +static void send_user_sigtrap(int si_code) +{ + struct pt_regs *regs = current_pt_regs(); + + if (WARN_ON(!user_mode(regs))) + return; + + if (interrupts_enabled(regs)) + local_irq_enable(); + + arm64_force_sig_fault(SIGTRAP, si_code, instruction_pointer(regs), + "User debug trap"); +} + +static int single_step_handler(unsigned long unused, unsigned long esr, + struct pt_regs *regs) +{ + bool handler_found = false; + + /* + * If we are stepping a pending breakpoint, call the hw_breakpoint + * handler first. + */ + if (!reinstall_suspended_bps(regs)) + return 0; + + if (!handler_found && call_step_hook(regs, esr) == DBG_HOOK_HANDLED) + handler_found = true; + + if (!handler_found && user_mode(regs)) { + send_user_sigtrap(TRAP_TRACE); + + /* + * ptrace will disable single step unless explicitly + * asked to re-enable it. For other clients, it makes + * sense to leave it enabled (i.e. rewind the controls + * to the active-not-pending state). + */ + user_rewind_single_step(current); + } else if (!handler_found) { + pr_warn("Unexpected kernel single-step exception at EL1\n"); + /* + * Re-enable stepping since we know that we will be + * returning to regs. + */ + set_regs_spsr_ss(regs); + } + + return 0; +} +NOKPROBE_SYMBOL(single_step_handler); + +static LIST_HEAD(user_break_hook); +static LIST_HEAD(kernel_break_hook); + +void register_user_break_hook(struct break_hook *hook) +{ + register_debug_hook(&hook->node, &user_break_hook); +} + +void unregister_user_break_hook(struct break_hook *hook) +{ + unregister_debug_hook(&hook->node); +} + +void register_kernel_break_hook(struct break_hook *hook) +{ + register_debug_hook(&hook->node, &kernel_break_hook); +} + +void unregister_kernel_break_hook(struct break_hook *hook) +{ + unregister_debug_hook(&hook->node); +} + +static int call_break_hook(struct pt_regs *regs, unsigned long esr) +{ + struct break_hook *hook; + struct list_head *list; + int (*fn)(struct pt_regs *regs, unsigned long esr) = NULL; + + list = user_mode(regs) ? &user_break_hook : &kernel_break_hook; + + /* + * Since brk exception disables interrupt, this function is + * entirely not preemptible, and we can use rcu list safely here. + */ + list_for_each_entry_rcu(hook, list, node) { + unsigned long comment = esr & ESR_ELx_BRK64_ISS_COMMENT_MASK; + + if ((comment & ~hook->mask) == hook->imm) + fn = hook->fn; + } + + return fn ? fn(regs, esr) : DBG_HOOK_ERROR; +} +NOKPROBE_SYMBOL(call_break_hook); + +static int brk_handler(unsigned long unused, unsigned long esr, + struct pt_regs *regs) +{ + if (call_break_hook(regs, esr) == DBG_HOOK_HANDLED) + return 0; + + if (user_mode(regs)) { + send_user_sigtrap(TRAP_BRKPT); + } else { + pr_warn("Unexpected kernel BRK exception at EL1\n"); + return -EFAULT; + } + + return 0; +} +NOKPROBE_SYMBOL(brk_handler); + +int aarch32_break_handler(struct pt_regs *regs) +{ + u32 arm_instr; + u16 thumb_instr; + bool bp = false; + void __user *pc = (void __user *)instruction_pointer(regs); + + if (!compat_user_mode(regs)) + return -EFAULT; + + if (compat_thumb_mode(regs)) { + /* get 16-bit Thumb instruction */ + __le16 instr; + get_user(instr, (__le16 __user *)pc); + thumb_instr = le16_to_cpu(instr); + if (thumb_instr == AARCH32_BREAK_THUMB2_LO) { + /* get second half of 32-bit Thumb-2 instruction */ + get_user(instr, (__le16 __user *)(pc + 2)); + thumb_instr = le16_to_cpu(instr); + bp = thumb_instr == AARCH32_BREAK_THUMB2_HI; + } else { + bp = thumb_instr == AARCH32_BREAK_THUMB; + } + } else { + /* 32-bit ARM instruction */ + __le32 instr; + get_user(instr, (__le32 __user *)pc); + arm_instr = le32_to_cpu(instr); + bp = (arm_instr & ~0xf0000000) == AARCH32_BREAK_ARM; + } + + if (!bp) + return -EFAULT; + + send_user_sigtrap(TRAP_BRKPT); + return 0; +} +NOKPROBE_SYMBOL(aarch32_break_handler); + +void __init debug_traps_init(void) +{ + hook_debug_fault_code(DBG_ESR_EVT_HWSS, single_step_handler, SIGTRAP, + TRAP_TRACE, "single-step handler"); + hook_debug_fault_code(DBG_ESR_EVT_BRK, brk_handler, SIGTRAP, + TRAP_BRKPT, "BRK handler"); +} + +/* Re-enable single step for syscall restarting. */ +void user_rewind_single_step(struct task_struct *task) +{ + /* + * If single step is active for this thread, then set SPSR.SS + * to 1 to avoid returning to the active-pending state. + */ + if (test_tsk_thread_flag(task, TIF_SINGLESTEP)) + set_regs_spsr_ss(task_pt_regs(task)); +} +NOKPROBE_SYMBOL(user_rewind_single_step); + +void user_fastforward_single_step(struct task_struct *task) +{ + if (test_tsk_thread_flag(task, TIF_SINGLESTEP)) + clear_regs_spsr_ss(task_pt_regs(task)); +} + +void user_regs_reset_single_step(struct user_pt_regs *regs, + struct task_struct *task) +{ + if (test_tsk_thread_flag(task, TIF_SINGLESTEP)) + set_user_regs_spsr_ss(regs); + else + clear_user_regs_spsr_ss(regs); +} + +/* Kernel API */ +void kernel_enable_single_step(struct pt_regs *regs) +{ + WARN_ON(!irqs_disabled()); + set_regs_spsr_ss(regs); + mdscr_write(mdscr_read() | DBG_MDSCR_SS); + enable_debug_monitors(DBG_ACTIVE_EL1); +} +NOKPROBE_SYMBOL(kernel_enable_single_step); + +void kernel_disable_single_step(void) +{ + WARN_ON(!irqs_disabled()); + mdscr_write(mdscr_read() & ~DBG_MDSCR_SS); + disable_debug_monitors(DBG_ACTIVE_EL1); +} +NOKPROBE_SYMBOL(kernel_disable_single_step); + +int kernel_active_single_step(void) +{ + WARN_ON(!irqs_disabled()); + return mdscr_read() & DBG_MDSCR_SS; +} +NOKPROBE_SYMBOL(kernel_active_single_step); + +/* ptrace API */ +void user_enable_single_step(struct task_struct *task) +{ + struct thread_info *ti = task_thread_info(task); + + if (!test_and_set_ti_thread_flag(ti, TIF_SINGLESTEP)) + set_regs_spsr_ss(task_pt_regs(task)); +} +NOKPROBE_SYMBOL(user_enable_single_step); + +void user_disable_single_step(struct task_struct *task) +{ + clear_ti_thread_flag(task_thread_info(task), TIF_SINGLESTEP); +} +NOKPROBE_SYMBOL(user_disable_single_step); -- cgit v1.2.3