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/parisc/kernel/unwind.c | 489 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 489 insertions(+) create mode 100644 arch/parisc/kernel/unwind.c (limited to 'arch/parisc/kernel/unwind.c') diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c new file mode 100644 index 000000000..42acc3b52 --- /dev/null +++ b/arch/parisc/kernel/unwind.c @@ -0,0 +1,489 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Kernel unwinding support + * + * (c) 2002-2004 Randolph Chung + * + * Derived partially from the IA64 implementation. The PA-RISC + * Runtime Architecture Document is also a useful reference to + * understand what is happening here + */ + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include +#include +#include + +/* #define DEBUG 1 */ +#ifdef DEBUG +#define dbg(x...) pr_debug(x) +#else +#define dbg(x...) +#endif + +#define KERNEL_START (KERNEL_BINARY_TEXT_START) + +extern struct unwind_table_entry __start___unwind[]; +extern struct unwind_table_entry __stop___unwind[]; + +static DEFINE_SPINLOCK(unwind_lock); +/* + * the kernel unwind block is not dynamically allocated so that + * we can call unwind_init as early in the bootup process as + * possible (before the slab allocator is initialized) + */ +static struct unwind_table kernel_unwind_table __ro_after_init; +static LIST_HEAD(unwind_tables); + +static inline const struct unwind_table_entry * +find_unwind_entry_in_table(const struct unwind_table *table, unsigned long addr) +{ + const struct unwind_table_entry *e = NULL; + unsigned long lo, hi, mid; + + lo = 0; + hi = table->length - 1; + + while (lo <= hi) { + mid = (hi - lo) / 2 + lo; + e = &table->table[mid]; + if (addr < e->region_start) + hi = mid - 1; + else if (addr > e->region_end) + lo = mid + 1; + else + return e; + } + + return NULL; +} + +static const struct unwind_table_entry * +find_unwind_entry(unsigned long addr) +{ + struct unwind_table *table; + const struct unwind_table_entry *e = NULL; + + if (addr >= kernel_unwind_table.start && + addr <= kernel_unwind_table.end) + e = find_unwind_entry_in_table(&kernel_unwind_table, addr); + else { + unsigned long flags; + + spin_lock_irqsave(&unwind_lock, flags); + list_for_each_entry(table, &unwind_tables, list) { + if (addr >= table->start && + addr <= table->end) + e = find_unwind_entry_in_table(table, addr); + if (e) { + /* Move-to-front to exploit common traces */ + list_move(&table->list, &unwind_tables); + break; + } + } + spin_unlock_irqrestore(&unwind_lock, flags); + } + + return e; +} + +static void +unwind_table_init(struct unwind_table *table, const char *name, + unsigned long base_addr, unsigned long gp, + void *table_start, void *table_end) +{ + struct unwind_table_entry *start = table_start; + struct unwind_table_entry *end = + (struct unwind_table_entry *)table_end - 1; + + table->name = name; + table->base_addr = base_addr; + table->gp = gp; + table->start = base_addr + start->region_start; + table->end = base_addr + end->region_end; + table->table = (struct unwind_table_entry *)table_start; + table->length = end - start + 1; + INIT_LIST_HEAD(&table->list); + + for (; start <= end; start++) { + if (start < end && + start->region_end > (start+1)->region_start) { + pr_warn("Out of order unwind entry! %px and %px\n", + start, start+1); + } + + start->region_start += base_addr; + start->region_end += base_addr; + } +} + +static int cmp_unwind_table_entry(const void *a, const void *b) +{ + return ((const struct unwind_table_entry *)a)->region_start + - ((const struct unwind_table_entry *)b)->region_start; +} + +static void +unwind_table_sort(struct unwind_table_entry *start, + struct unwind_table_entry *finish) +{ + sort(start, finish - start, sizeof(struct unwind_table_entry), + cmp_unwind_table_entry, NULL); +} + +struct unwind_table * +unwind_table_add(const char *name, unsigned long base_addr, + unsigned long gp, + void *start, void *end) +{ + struct unwind_table *table; + unsigned long flags; + struct unwind_table_entry *s = (struct unwind_table_entry *)start; + struct unwind_table_entry *e = (struct unwind_table_entry *)end; + + unwind_table_sort(s, e); + + table = kmalloc(sizeof(struct unwind_table), GFP_USER); + if (table == NULL) + return NULL; + unwind_table_init(table, name, base_addr, gp, start, end); + spin_lock_irqsave(&unwind_lock, flags); + list_add_tail(&table->list, &unwind_tables); + spin_unlock_irqrestore(&unwind_lock, flags); + + return table; +} + +void unwind_table_remove(struct unwind_table *table) +{ + unsigned long flags; + + spin_lock_irqsave(&unwind_lock, flags); + list_del(&table->list); + spin_unlock_irqrestore(&unwind_lock, flags); + + kfree(table); +} + +/* Called from setup_arch to import the kernel unwind info */ +int __init unwind_init(void) +{ + long start, stop; + register unsigned long gp __asm__ ("r27"); + + start = (long)&__start___unwind[0]; + stop = (long)&__stop___unwind[0]; + + dbg("unwind_init: start = 0x%lx, end = 0x%lx, entries = %lu\n", + start, stop, + (stop - start) / sizeof(struct unwind_table_entry)); + + unwind_table_init(&kernel_unwind_table, "kernel", KERNEL_START, + gp, + &__start___unwind[0], &__stop___unwind[0]); +#if 0 + { + int i; + for (i = 0; i < 10; i++) + { + printk("region 0x%x-0x%x\n", + __start___unwind[i].region_start, + __start___unwind[i].region_end); + } + } +#endif + return 0; +} + +static bool pc_is_kernel_fn(unsigned long pc, void *fn) +{ + return (unsigned long)dereference_kernel_function_descriptor(fn) == pc; +} + +static int unwind_special(struct unwind_frame_info *info, unsigned long pc, int frame_size) +{ + /* + * We have to use void * instead of a function pointer, because + * function pointers aren't a pointer to the function on 64-bit. + * Make them const so the compiler knows they live in .text + * Note: We could use dereference_kernel_function_descriptor() + * instead but we want to keep it simple here. + */ + extern void * const handle_interruption; + extern void * const ret_from_kernel_thread; + extern void * const syscall_exit; + extern void * const intr_return; + extern void * const _switch_to_ret; +#ifdef CONFIG_IRQSTACKS + extern void * const _call_on_stack; +#endif /* CONFIG_IRQSTACKS */ + + if (pc_is_kernel_fn(pc, handle_interruption)) { + struct pt_regs *regs = (struct pt_regs *)(info->sp - frame_size - PT_SZ_ALGN); + dbg("Unwinding through handle_interruption()\n"); + info->prev_sp = regs->gr[30]; + info->prev_ip = regs->iaoq[0]; + return 1; + } + + if (pc_is_kernel_fn(pc, ret_from_kernel_thread) || + pc_is_kernel_fn(pc, syscall_exit)) { + info->prev_sp = info->prev_ip = 0; + return 1; + } + + if (pc_is_kernel_fn(pc, intr_return)) { + struct pt_regs *regs; + + dbg("Found intr_return()\n"); + regs = (struct pt_regs *)(info->sp - PT_SZ_ALGN); + info->prev_sp = regs->gr[30]; + info->prev_ip = regs->iaoq[0]; + info->rp = regs->gr[2]; + return 1; + } + + if (pc_is_kernel_fn(pc, _switch_to) || + pc_is_kernel_fn(pc, _switch_to_ret)) { + info->prev_sp = info->sp - CALLEE_SAVE_FRAME_SIZE; + info->prev_ip = *(unsigned long *)(info->prev_sp - RP_OFFSET); + return 1; + } + +#ifdef CONFIG_IRQSTACKS + if (pc_is_kernel_fn(pc, _call_on_stack)) { + info->prev_sp = *(unsigned long *)(info->sp - FRAME_SIZE - REG_SZ); + info->prev_ip = *(unsigned long *)(info->sp - FRAME_SIZE - RP_OFFSET); + return 1; + } +#endif + return 0; +} + +static void unwind_frame_regs(struct unwind_frame_info *info) +{ + const struct unwind_table_entry *e; + unsigned long npc; + unsigned int insn; + long frame_size = 0; + int looking_for_rp, rpoffset = 0; + + e = find_unwind_entry(info->ip); + if (e == NULL) { + unsigned long sp; + + dbg("Cannot find unwind entry for %pS; forced unwinding\n", + (void *) info->ip); + + /* Since we are doing the unwinding blind, we don't know if + we are adjusting the stack correctly or extracting the rp + correctly. The rp is checked to see if it belongs to the + kernel text section, if not we assume we don't have a + correct stack frame and we continue to unwind the stack. + This is not quite correct, and will fail for loadable + modules. */ + sp = info->sp & ~63; + do { + unsigned long tmp; + + info->prev_sp = sp - 64; + info->prev_ip = 0; + + /* Check if stack is inside kernel stack area */ + if ((info->prev_sp - (unsigned long) task_stack_page(info->t)) + >= THREAD_SIZE) { + info->prev_sp = 0; + break; + } + + if (copy_from_kernel_nofault(&tmp, + (void *)info->prev_sp - RP_OFFSET, sizeof(tmp))) + break; + info->prev_ip = tmp; + sp = info->prev_sp; + } while (!kernel_text_address(info->prev_ip)); + + info->rp = 0; + + dbg("analyzing func @ %lx with no unwind info, setting " + "prev_sp=%lx prev_ip=%lx\n", info->ip, + info->prev_sp, info->prev_ip); + } else { + dbg("e->start = 0x%x, e->end = 0x%x, Save_SP = %d, " + "Save_RP = %d, Millicode = %d size = %u\n", + e->region_start, e->region_end, e->Save_SP, e->Save_RP, + e->Millicode, e->Total_frame_size); + + looking_for_rp = e->Save_RP; + + for (npc = e->region_start; + (frame_size < (e->Total_frame_size << 3) || + looking_for_rp) && + npc < info->ip; + npc += 4) { + + insn = *(unsigned int *)npc; + + if ((insn & 0xffffc001) == 0x37de0000 || + (insn & 0xffe00001) == 0x6fc00000) { + /* ldo X(sp), sp, or stwm X,D(sp) */ + frame_size += (insn & 0x3fff) >> 1; + dbg("analyzing func @ %lx, insn=%08x @ " + "%lx, frame_size = %ld\n", info->ip, + insn, npc, frame_size); + } else if ((insn & 0xffe00009) == 0x73c00008) { + /* std,ma X,D(sp) */ + frame_size += ((insn >> 4) & 0x3ff) << 3; + dbg("analyzing func @ %lx, insn=%08x @ " + "%lx, frame_size = %ld\n", info->ip, + insn, npc, frame_size); + } else if (insn == 0x6bc23fd9) { + /* stw rp,-20(sp) */ + rpoffset = 20; + looking_for_rp = 0; + dbg("analyzing func @ %lx, insn=stw rp," + "-20(sp) @ %lx\n", info->ip, npc); + } else if (insn == 0x0fc212c1) { + /* std rp,-16(sr0,sp) */ + rpoffset = 16; + looking_for_rp = 0; + dbg("analyzing func @ %lx, insn=std rp," + "-16(sp) @ %lx\n", info->ip, npc); + } + } + + if (frame_size > e->Total_frame_size << 3) + frame_size = e->Total_frame_size << 3; + + if (!unwind_special(info, e->region_start, frame_size)) { + info->prev_sp = info->sp - frame_size; + if (e->Millicode) + info->rp = info->r31; + else if (rpoffset) + info->rp = *(unsigned long *)(info->prev_sp - rpoffset); + info->prev_ip = info->rp; + info->rp = 0; + } + + dbg("analyzing func @ %lx, setting prev_sp=%lx " + "prev_ip=%lx npc=%lx\n", info->ip, info->prev_sp, + info->prev_ip, npc); + } +} + +void unwind_frame_init(struct unwind_frame_info *info, struct task_struct *t, + struct pt_regs *regs) +{ + memset(info, 0, sizeof(struct unwind_frame_info)); + info->t = t; + info->sp = regs->gr[30]; + info->ip = regs->iaoq[0]; + info->rp = regs->gr[2]; + info->r31 = regs->gr[31]; + + dbg("(%d) Start unwind from sp=%08lx ip=%08lx\n", + t ? (int)t->pid : -1, info->sp, info->ip); +} + +void unwind_frame_init_from_blocked_task(struct unwind_frame_info *info, struct task_struct *t) +{ + struct pt_regs *r = &t->thread.regs; + struct pt_regs *r2; + + r2 = kmalloc(sizeof(struct pt_regs), GFP_ATOMIC); + if (!r2) + return; + *r2 = *r; + r2->gr[30] = r->ksp; + r2->iaoq[0] = r->kpc; + unwind_frame_init(info, t, r2); + kfree(r2); +} + +#define get_parisc_stackpointer() ({ \ + unsigned long sp; \ + __asm__("copy %%r30, %0" : "=r"(sp)); \ + (sp); \ +}) + +void unwind_frame_init_task(struct unwind_frame_info *info, + struct task_struct *task, struct pt_regs *regs) +{ + task = task ? task : current; + + if (task == current) { + struct pt_regs r; + + if (!regs) { + memset(&r, 0, sizeof(r)); + r.iaoq[0] = _THIS_IP_; + r.gr[2] = _RET_IP_; + r.gr[30] = get_parisc_stackpointer(); + regs = &r; + } + unwind_frame_init(info, task, regs); + } else { + unwind_frame_init_from_blocked_task(info, task); + } +} + +int unwind_once(struct unwind_frame_info *next_frame) +{ + unwind_frame_regs(next_frame); + + if (next_frame->prev_sp == 0 || + next_frame->prev_ip == 0) + return -1; + + next_frame->sp = next_frame->prev_sp; + next_frame->ip = next_frame->prev_ip; + next_frame->prev_sp = 0; + next_frame->prev_ip = 0; + + dbg("(%d) Continue unwind to sp=%08lx ip=%08lx\n", + next_frame->t ? (int)next_frame->t->pid : -1, + next_frame->sp, next_frame->ip); + + return 0; +} + +int unwind_to_user(struct unwind_frame_info *info) +{ + int ret; + + do { + ret = unwind_once(info); + } while (!ret && !(info->ip & 3)); + + return ret; +} + +unsigned long return_address(unsigned int level) +{ + struct unwind_frame_info info; + + /* initialize unwind info */ + unwind_frame_init_task(&info, current, NULL); + + /* unwind stack */ + level += 2; + do { + if (unwind_once(&info) < 0 || info.ip == 0) + return 0; + if (!kernel_text_address(info.ip)) + return 0; + } while (info.ip && level--); + + return info.ip; +} -- cgit v1.2.3