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/s390/kernel/machine_kexec.c | 297 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 297 insertions(+) create mode 100644 arch/s390/kernel/machine_kexec.c (limited to 'arch/s390/kernel/machine_kexec.c') diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c new file mode 100644 index 000000000..2a8e73266 --- /dev/null +++ b/arch/s390/kernel/machine_kexec.c @@ -0,0 +1,297 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2005, 2011 + * + * Author(s): Rolf Adelsberger, + * Michael Holzheu + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long, + unsigned long); + +extern const unsigned char relocate_kernel[]; +extern const unsigned long long relocate_kernel_len; + +#ifdef CONFIG_CRASH_DUMP + +/* + * Reset the system, copy boot CPU registers to absolute zero, + * and jump to the kdump image + */ +static void __do_machine_kdump(void *image) +{ + int (*start_kdump)(int); + unsigned long prefix; + + /* store_status() saved the prefix register to lowcore */ + prefix = (unsigned long) S390_lowcore.prefixreg_save_area; + + /* Now do the reset */ + s390_reset_system(); + + /* + * Copy dump CPU store status info to absolute zero. + * This need to be done *after* s390_reset_system set the + * prefix register of this CPU to zero + */ + memcpy(absolute_pointer(__LC_FPREGS_SAVE_AREA), + (void *)(prefix + __LC_FPREGS_SAVE_AREA), 512); + + __load_psw_mask(PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA); + start_kdump = (void *)((struct kimage *) image)->start; + start_kdump(1); + + /* Die if start_kdump returns */ + disabled_wait(); +} + +/* + * Start kdump: create a LGR log entry, store status of all CPUs and + * branch to __do_machine_kdump. + */ +static noinline void __machine_kdump(void *image) +{ + struct mcesa *mcesa; + union ctlreg2 cr2_old, cr2_new; + int this_cpu, cpu; + + lgr_info_log(); + /* Get status of the other CPUs */ + this_cpu = smp_find_processor_id(stap()); + for_each_online_cpu(cpu) { + if (cpu == this_cpu) + continue; + if (smp_store_status(cpu)) + continue; + } + /* Store status of the boot CPU */ + mcesa = __va(S390_lowcore.mcesad & MCESA_ORIGIN_MASK); + if (MACHINE_HAS_VX) + save_vx_regs((__vector128 *) mcesa->vector_save_area); + if (MACHINE_HAS_GS) { + __ctl_store(cr2_old.val, 2, 2); + cr2_new = cr2_old; + cr2_new.gse = 1; + __ctl_load(cr2_new.val, 2, 2); + save_gs_cb((struct gs_cb *) mcesa->guarded_storage_save_area); + __ctl_load(cr2_old.val, 2, 2); + } + /* + * To create a good backchain for this CPU in the dump store_status + * is passed the address of a function. The address is saved into + * the PSW save area of the boot CPU and the function is invoked as + * a tail call of store_status. The backchain in the dump will look + * like this: + * restart_int_handler -> __machine_kexec -> __do_machine_kdump + * The call to store_status() will not return. + */ + store_status(__do_machine_kdump, image); +} + +static unsigned long do_start_kdump(unsigned long addr) +{ + struct kimage *image = (struct kimage *) addr; + int (*start_kdump)(int) = (void *)image->start; + int rc; + + __arch_local_irq_stnsm(0xfb); /* disable DAT */ + rc = start_kdump(0); + __arch_local_irq_stosm(0x04); /* enable DAT */ + return rc; +} + +#endif /* CONFIG_CRASH_DUMP */ + +/* + * Check if kdump checksums are valid: We call purgatory with parameter "0" + */ +static bool kdump_csum_valid(struct kimage *image) +{ +#ifdef CONFIG_CRASH_DUMP + int rc; + + preempt_disable(); + rc = call_on_stack(1, S390_lowcore.nodat_stack, unsigned long, do_start_kdump, + unsigned long, (unsigned long)image); + preempt_enable(); + return rc == 0; +#else + return false; +#endif +} + +#ifdef CONFIG_CRASH_DUMP + +void crash_free_reserved_phys_range(unsigned long begin, unsigned long end) +{ + unsigned long addr, size; + + for (addr = begin; addr < end; addr += PAGE_SIZE) + free_reserved_page(pfn_to_page(addr >> PAGE_SHIFT)); + size = begin - crashk_res.start; + if (size) + os_info_crashkernel_add(crashk_res.start, size); + else + os_info_crashkernel_add(0, 0); +} + +static void crash_protect_pages(int protect) +{ + unsigned long size; + + if (!crashk_res.end) + return; + size = resource_size(&crashk_res); + if (protect) + set_memory_ro(crashk_res.start, size >> PAGE_SHIFT); + else + set_memory_rw(crashk_res.start, size >> PAGE_SHIFT); +} + +void arch_kexec_protect_crashkres(void) +{ + crash_protect_pages(1); +} + +void arch_kexec_unprotect_crashkres(void) +{ + crash_protect_pages(0); +} + +#endif + +/* + * Give back memory to hypervisor before new kdump is loaded + */ +static int machine_kexec_prepare_kdump(void) +{ +#ifdef CONFIG_CRASH_DUMP + if (MACHINE_IS_VM) + diag10_range(PFN_DOWN(crashk_res.start), + PFN_DOWN(crashk_res.end - crashk_res.start + 1)); + return 0; +#else + return -EINVAL; +#endif +} + +int machine_kexec_prepare(struct kimage *image) +{ + void *reboot_code_buffer; + + if (image->type == KEXEC_TYPE_CRASH) + return machine_kexec_prepare_kdump(); + + /* We don't support anything but the default image type for now. */ + if (image->type != KEXEC_TYPE_DEFAULT) + return -EINVAL; + + /* Get the destination where the assembler code should be copied to.*/ + reboot_code_buffer = (void *) page_to_phys(image->control_code_page); + + /* Then copy it */ + memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len); + return 0; +} + +void machine_kexec_cleanup(struct kimage *image) +{ +} + +void arch_crash_save_vmcoreinfo(void) +{ + struct lowcore *abs_lc; + + VMCOREINFO_SYMBOL(lowcore_ptr); + VMCOREINFO_SYMBOL(high_memory); + VMCOREINFO_LENGTH(lowcore_ptr, NR_CPUS); + vmcoreinfo_append_str("SAMODE31=%lx\n", __samode31); + vmcoreinfo_append_str("EAMODE31=%lx\n", __eamode31); + vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset()); + abs_lc = get_abs_lowcore(); + abs_lc->vmcore_info = paddr_vmcoreinfo_note(); + put_abs_lowcore(abs_lc); +} + +void machine_shutdown(void) +{ +} + +void machine_crash_shutdown(struct pt_regs *regs) +{ + set_os_info_reipl_block(); +} + +/* + * Do normal kexec + */ +static void __do_machine_kexec(void *data) +{ + unsigned long diag308_subcode; + relocate_kernel_t data_mover; + struct kimage *image = data; + + s390_reset_system(); + data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page); + + __arch_local_irq_stnsm(0xfb); /* disable DAT - avoid no-execute */ + /* Call the moving routine */ + diag308_subcode = DIAG308_CLEAR_RESET; + if (sclp.has_iplcc) + diag308_subcode |= DIAG308_FLAG_EI; + (*data_mover)(&image->head, image->start, diag308_subcode); + + /* Die if kexec returns */ + disabled_wait(); +} + +/* + * Reset system and call either kdump or normal kexec + */ +static void __machine_kexec(void *data) +{ + pfault_fini(); + tracing_off(); + debug_locks_off(); +#ifdef CONFIG_CRASH_DUMP + if (((struct kimage *) data)->type == KEXEC_TYPE_CRASH) + __machine_kdump(data); +#endif + __do_machine_kexec(data); +} + +/* + * Do either kdump or normal kexec. In case of kdump we first ask + * purgatory, if kdump checksums are valid. + */ +void machine_kexec(struct kimage *image) +{ + if (image->type == KEXEC_TYPE_CRASH && !kdump_csum_valid(image)) + return; + tracer_disable(); + smp_send_stop(); + smp_call_ipl_cpu(__machine_kexec, image); +} -- cgit v1.2.3