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/ia64/kernel/mca_drv.c | 796 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 796 insertions(+) create mode 100644 arch/ia64/kernel/mca_drv.c (limited to 'arch/ia64/kernel/mca_drv.c') diff --git a/arch/ia64/kernel/mca_drv.c b/arch/ia64/kernel/mca_drv.c new file mode 100644 index 000000000..23c203639 --- /dev/null +++ b/arch/ia64/kernel/mca_drv.c @@ -0,0 +1,796 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * File: mca_drv.c + * Purpose: Generic MCA handling layer + * + * Copyright (C) 2004 FUJITSU LIMITED + * Copyright (C) 2004 Hidetoshi Seto + * Copyright (C) 2005 Silicon Graphics, Inc + * Copyright (C) 2005 Keith Owens + * Copyright (C) 2006 Russ Anderson + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include +#include + +#include "mca_drv.h" + +/* max size of SAL error record (default) */ +static int sal_rec_max = 10000; + +/* from mca_drv_asm.S */ +extern void *mca_handler_bhhook(void); + +static DEFINE_SPINLOCK(mca_bh_lock); + +typedef enum { + MCA_IS_LOCAL = 0, + MCA_IS_GLOBAL = 1 +} mca_type_t; + +#define MAX_PAGE_ISOLATE 1024 + +static struct page *page_isolate[MAX_PAGE_ISOLATE]; +static int num_page_isolate = 0; + +typedef enum { + ISOLATE_NG, + ISOLATE_OK, + ISOLATE_NONE +} isolate_status_t; + +typedef enum { + MCA_NOT_RECOVERED = 0, + MCA_RECOVERED = 1 +} recovery_status_t; + +/* + * This pool keeps pointers to the section part of SAL error record + */ +static struct { + slidx_list_t *buffer; /* section pointer list pool */ + int cur_idx; /* Current index of section pointer list pool */ + int max_idx; /* Maximum index of section pointer list pool */ +} slidx_pool; + +static int +fatal_mca(const char *fmt, ...) +{ + va_list args; + char buf[256]; + + va_start(args, fmt); + vsnprintf(buf, sizeof(buf), fmt, args); + va_end(args); + ia64_mca_printk(KERN_ALERT "MCA: %s\n", buf); + + return MCA_NOT_RECOVERED; +} + +static int +mca_recovered(const char *fmt, ...) +{ + va_list args; + char buf[256]; + + va_start(args, fmt); + vsnprintf(buf, sizeof(buf), fmt, args); + va_end(args); + ia64_mca_printk(KERN_INFO "MCA: %s\n", buf); + + return MCA_RECOVERED; +} + +/** + * mca_page_isolate - isolate a poisoned page in order not to use it later + * @paddr: poisoned memory location + * + * Return value: + * one of isolate_status_t, ISOLATE_OK/NG/NONE. + */ + +static isolate_status_t +mca_page_isolate(unsigned long paddr) +{ + int i; + struct page *p; + + /* whether physical address is valid or not */ + if (!ia64_phys_addr_valid(paddr)) + return ISOLATE_NONE; + + if (!pfn_valid(paddr >> PAGE_SHIFT)) + return ISOLATE_NONE; + + /* convert physical address to physical page number */ + p = pfn_to_page(paddr>>PAGE_SHIFT); + + /* check whether a page number have been already registered or not */ + for (i = 0; i < num_page_isolate; i++) + if (page_isolate[i] == p) + return ISOLATE_OK; /* already listed */ + + /* limitation check */ + if (num_page_isolate == MAX_PAGE_ISOLATE) + return ISOLATE_NG; + + /* kick pages having attribute 'SLAB' or 'Reserved' */ + if (PageSlab(p) || PageReserved(p)) + return ISOLATE_NG; + + /* add attribute 'Reserved' and register the page */ + get_page(p); + SetPageReserved(p); + page_isolate[num_page_isolate++] = p; + + return ISOLATE_OK; +} + +/** + * mca_hanlder_bh - Kill the process which occurred memory read error + * @paddr: poisoned address received from MCA Handler + */ + +void +mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr) +{ + ia64_mlogbuf_dump(); + printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, " + "iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n", + raw_smp_processor_id(), current->pid, + from_kuid(&init_user_ns, current_uid()), + iip, ipsr, paddr, current->comm); + + spin_lock(&mca_bh_lock); + switch (mca_page_isolate(paddr)) { + case ISOLATE_OK: + printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr); + break; + case ISOLATE_NG: + printk(KERN_CRIT "Page isolation: ( %lx ) failure.\n", paddr); + break; + default: + break; + } + spin_unlock(&mca_bh_lock); + + /* This process is about to be killed itself */ + make_task_dead(SIGKILL); +} + +/** + * mca_make_peidx - Make index of processor error section + * @slpi: pointer to record of processor error section + * @peidx: pointer to index of processor error section + */ + +static void +mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx) +{ + /* + * calculate the start address of + * "struct cpuid_info" and "sal_processor_static_info_t". + */ + u64 total_check_num = slpi->valid.num_cache_check + + slpi->valid.num_tlb_check + + slpi->valid.num_bus_check + + slpi->valid.num_reg_file_check + + slpi->valid.num_ms_check; + u64 head_size = sizeof(sal_log_mod_error_info_t) * total_check_num + + sizeof(sal_log_processor_info_t); + u64 mid_size = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info); + + peidx_head(peidx) = slpi; + peidx_mid(peidx) = (struct sal_cpuid_info *) + (slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL); + peidx_bottom(peidx) = (sal_processor_static_info_t *) + (slpi->valid.psi_static_struct ? + ((char*)slpi + head_size + mid_size) : NULL); +} + +/** + * mca_make_slidx - Make index of SAL error record + * @buffer: pointer to SAL error record + * @slidx: pointer to index of SAL error record + * + * Return value: + * 1 if record has platform error / 0 if not + */ +#define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \ + {slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \ + hl->hdr = ptr; \ + list_add(&hl->list, &(sect)); \ + slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; } + +static int +mca_make_slidx(void *buffer, slidx_table_t *slidx) +{ + int platform_err = 0; + int record_len = ((sal_log_record_header_t*)buffer)->len; + u32 ercd_pos; + int sects; + sal_log_section_hdr_t *sp; + + /* + * Initialize index referring current record + */ + INIT_LIST_HEAD(&(slidx->proc_err)); + INIT_LIST_HEAD(&(slidx->mem_dev_err)); + INIT_LIST_HEAD(&(slidx->sel_dev_err)); + INIT_LIST_HEAD(&(slidx->pci_bus_err)); + INIT_LIST_HEAD(&(slidx->smbios_dev_err)); + INIT_LIST_HEAD(&(slidx->pci_comp_err)); + INIT_LIST_HEAD(&(slidx->plat_specific_err)); + INIT_LIST_HEAD(&(slidx->host_ctlr_err)); + INIT_LIST_HEAD(&(slidx->plat_bus_err)); + INIT_LIST_HEAD(&(slidx->unsupported)); + + /* + * Extract a Record Header + */ + slidx->header = buffer; + + /* + * Extract each section records + * (arranged from "int ia64_log_platform_info_print()") + */ + for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0; + ercd_pos < record_len; ercd_pos += sp->len, sects++) { + sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos); + if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) { + LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp); + } else if (!efi_guidcmp(sp->guid, + SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) { + platform_err = 1; + LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp); + } else if (!efi_guidcmp(sp->guid, + SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) { + platform_err = 1; + LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp); + } else if (!efi_guidcmp(sp->guid, + SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) { + platform_err = 1; + LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp); + } else if (!efi_guidcmp(sp->guid, + SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) { + platform_err = 1; + LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp); + } else if (!efi_guidcmp(sp->guid, + SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) { + platform_err = 1; + LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp); + } else if (!efi_guidcmp(sp->guid, + SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) { + platform_err = 1; + LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp); + } else if (!efi_guidcmp(sp->guid, + SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) { + platform_err = 1; + LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp); + } else if (!efi_guidcmp(sp->guid, + SAL_PLAT_BUS_ERR_SECT_GUID)) { + platform_err = 1; + LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp); + } else { + LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp); + } + } + slidx->n_sections = sects; + + return platform_err; +} + +/** + * init_record_index_pools - Initialize pool of lists for SAL record index + * + * Return value: + * 0 on Success / -ENOMEM on Failure + */ +static int +init_record_index_pools(void) +{ + int i; + int rec_max_size; /* Maximum size of SAL error records */ + int sect_min_size; /* Minimum size of SAL error sections */ + /* minimum size table of each section */ + static int sal_log_sect_min_sizes[] = { + sizeof(sal_log_processor_info_t) + + sizeof(sal_processor_static_info_t), + sizeof(sal_log_mem_dev_err_info_t), + sizeof(sal_log_sel_dev_err_info_t), + sizeof(sal_log_pci_bus_err_info_t), + sizeof(sal_log_smbios_dev_err_info_t), + sizeof(sal_log_pci_comp_err_info_t), + sizeof(sal_log_plat_specific_err_info_t), + sizeof(sal_log_host_ctlr_err_info_t), + sizeof(sal_log_plat_bus_err_info_t), + }; + + /* + * MCA handler cannot allocate new memory on flight, + * so we preallocate enough memory to handle a SAL record. + * + * Initialize a handling set of slidx_pool: + * 1. Pick up the max size of SAL error records + * 2. Pick up the min size of SAL error sections + * 3. Allocate the pool as enough to 2 SAL records + * (now we can estimate the maxinum of section in a record.) + */ + + /* - 1 - */ + rec_max_size = sal_rec_max; + + /* - 2 - */ + sect_min_size = sal_log_sect_min_sizes[0]; + for (i = 1; i < ARRAY_SIZE(sal_log_sect_min_sizes); i++) + if (sect_min_size > sal_log_sect_min_sizes[i]) + sect_min_size = sal_log_sect_min_sizes[i]; + + /* - 3 - */ + slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1; + slidx_pool.buffer = + kmalloc_array(slidx_pool.max_idx, sizeof(slidx_list_t), + GFP_KERNEL); + + return slidx_pool.buffer ? 0 : -ENOMEM; +} + + +/***************************************************************************** + * Recovery functions * + *****************************************************************************/ + +/** + * is_mca_global - Check whether this MCA is global or not + * @peidx: pointer of index of processor error section + * @pbci: pointer to pal_bus_check_info_t + * @sos: pointer to hand off struct between SAL and OS + * + * Return value: + * MCA_IS_LOCAL / MCA_IS_GLOBAL + */ + +static mca_type_t +is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci, + struct ia64_sal_os_state *sos) +{ + pal_processor_state_info_t *psp = + (pal_processor_state_info_t*)peidx_psp(peidx); + + /* + * PAL can request a rendezvous, if the MCA has a global scope. + * If "rz_always" flag is set, SAL requests MCA rendezvous + * in spite of global MCA. + * Therefore it is local MCA when rendezvous has not been requested. + * Failed to rendezvous, the system must be down. + */ + switch (sos->rv_rc) { + case -1: /* SAL rendezvous unsuccessful */ + return MCA_IS_GLOBAL; + case 0: /* SAL rendezvous not required */ + return MCA_IS_LOCAL; + case 1: /* SAL rendezvous successful int */ + case 2: /* SAL rendezvous successful int with init */ + default: + break; + } + + /* + * If One or more Cache/TLB/Reg_File/Uarch_Check is here, + * it would be a local MCA. (i.e. processor internal error) + */ + if (psp->tc || psp->cc || psp->rc || psp->uc) + return MCA_IS_LOCAL; + + /* + * Bus_Check structure with Bus_Check.ib (internal bus error) flag set + * would be a global MCA. (e.g. a system bus address parity error) + */ + if (!pbci || pbci->ib) + return MCA_IS_GLOBAL; + + /* + * Bus_Check structure with Bus_Check.eb (external bus error) flag set + * could be either a local MCA or a global MCA. + * + * Referring Bus_Check.bsi: + * 0: Unknown/unclassified + * 1: BERR# + * 2: BINIT# + * 3: Hard Fail + * (FIXME: Are these SGI specific or generic bsi values?) + */ + if (pbci->eb) + switch (pbci->bsi) { + case 0: + /* e.g. a load from poisoned memory */ + return MCA_IS_LOCAL; + case 1: + case 2: + case 3: + return MCA_IS_GLOBAL; + } + + return MCA_IS_GLOBAL; +} + +/** + * get_target_identifier - Get the valid Cache or Bus check target identifier. + * @peidx: pointer of index of processor error section + * + * Return value: + * target address on Success / 0 on Failure + */ +static u64 +get_target_identifier(peidx_table_t *peidx) +{ + u64 target_address = 0; + sal_log_mod_error_info_t *smei; + pal_cache_check_info_t *pcci; + int i, level = 9; + + /* + * Look through the cache checks for a valid target identifier + * If more than one valid target identifier, return the one + * with the lowest cache level. + */ + for (i = 0; i < peidx_cache_check_num(peidx); i++) { + smei = (sal_log_mod_error_info_t *)peidx_cache_check(peidx, i); + if (smei->valid.target_identifier && smei->target_identifier) { + pcci = (pal_cache_check_info_t *)&(smei->check_info); + if (!target_address || (pcci->level < level)) { + target_address = smei->target_identifier; + level = pcci->level; + continue; + } + } + } + if (target_address) + return target_address; + + /* + * Look at the bus check for a valid target identifier + */ + smei = peidx_bus_check(peidx, 0); + if (smei && smei->valid.target_identifier) + return smei->target_identifier; + + return 0; +} + +/** + * recover_from_read_error - Try to recover the errors which type are "read"s. + * @slidx: pointer of index of SAL error record + * @peidx: pointer of index of processor error section + * @pbci: pointer of pal_bus_check_info + * @sos: pointer to hand off struct between SAL and OS + * + * Return value: + * 1 on Success / 0 on Failure + */ + +static int +recover_from_read_error(slidx_table_t *slidx, + peidx_table_t *peidx, pal_bus_check_info_t *pbci, + struct ia64_sal_os_state *sos) +{ + u64 target_identifier; + struct pal_min_state_area *pmsa; + struct ia64_psr *psr1, *psr2; + ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook; + + /* Is target address valid? */ + target_identifier = get_target_identifier(peidx); + if (!target_identifier) + return fatal_mca("target address not valid"); + + /* + * cpu read or memory-mapped io read + * + * offending process affected process OS MCA do + * kernel mode kernel mode down system + * kernel mode user mode kill the process + * user mode kernel mode down system (*) + * user mode user mode kill the process + * + * (*) You could terminate offending user-mode process + * if (pbci->pv && pbci->pl != 0) *and* if you sure + * the process not have any locks of kernel. + */ + + /* Is minstate valid? */ + if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate)) + return fatal_mca("minstate not valid"); + psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr); + psr2 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_xpsr); + + /* + * Check the privilege level of interrupted context. + * If it is user-mode, then terminate affected process. + */ + + pmsa = sos->pal_min_state; + if (psr1->cpl != 0 || + ((psr2->cpl != 0) && mca_recover_range(pmsa->pmsa_iip))) { + /* + * setup for resume to bottom half of MCA, + * "mca_handler_bhhook" + */ + /* pass to bhhook as argument (gr8, ...) */ + pmsa->pmsa_gr[8-1] = target_identifier; + pmsa->pmsa_gr[9-1] = pmsa->pmsa_iip; + pmsa->pmsa_gr[10-1] = pmsa->pmsa_ipsr; + /* set interrupted return address (but no use) */ + pmsa->pmsa_br0 = pmsa->pmsa_iip; + /* change resume address to bottom half */ + pmsa->pmsa_iip = mca_hdlr_bh->fp; + pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp; + /* set cpl with kernel mode */ + psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr; + psr2->cpl = 0; + psr2->ri = 0; + psr2->bn = 1; + psr2->i = 0; + + return mca_recovered("user memory corruption. " + "kill affected process - recovered."); + } + + return fatal_mca("kernel context not recovered, iip 0x%lx\n", + pmsa->pmsa_iip); +} + +/** + * recover_from_platform_error - Recover from platform error. + * @slidx: pointer of index of SAL error record + * @peidx: pointer of index of processor error section + * @pbci: pointer of pal_bus_check_info + * @sos: pointer to hand off struct between SAL and OS + * + * Return value: + * 1 on Success / 0 on Failure + */ + +static int +recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx, + pal_bus_check_info_t *pbci, + struct ia64_sal_os_state *sos) +{ + int status = 0; + pal_processor_state_info_t *psp = + (pal_processor_state_info_t*)peidx_psp(peidx); + + if (psp->bc && pbci->eb && pbci->bsi == 0) { + switch(pbci->type) { + case 1: /* partial read */ + case 3: /* full line(cpu) read */ + case 9: /* I/O space read */ + status = recover_from_read_error(slidx, peidx, pbci, + sos); + break; + case 0: /* unknown */ + case 2: /* partial write */ + case 4: /* full line write */ + case 5: /* implicit or explicit write-back operation */ + case 6: /* snoop probe */ + case 7: /* incoming or outgoing ptc.g */ + case 8: /* write coalescing transactions */ + case 10: /* I/O space write */ + case 11: /* inter-processor interrupt message(IPI) */ + case 12: /* interrupt acknowledge or + external task priority cycle */ + default: + break; + } + } else if (psp->cc && !psp->bc) { /* Cache error */ + status = recover_from_read_error(slidx, peidx, pbci, sos); + } + + return status; +} + +/* + * recover_from_tlb_check + * @peidx: pointer of index of processor error section + * + * Return value: + * 1 on Success / 0 on Failure + */ +static int +recover_from_tlb_check(peidx_table_t *peidx) +{ + sal_log_mod_error_info_t *smei; + pal_tlb_check_info_t *ptci; + + smei = (sal_log_mod_error_info_t *)peidx_tlb_check(peidx, 0); + ptci = (pal_tlb_check_info_t *)&(smei->check_info); + + /* + * Look for signature of a duplicate TLB DTC entry, which is + * a SW bug and always fatal. + */ + if (ptci->op == PAL_TLB_CHECK_OP_PURGE + && !(ptci->itr || ptci->dtc || ptci->itc)) + return fatal_mca("Duplicate TLB entry"); + + return mca_recovered("TLB check recovered"); +} + +/** + * recover_from_processor_error + * @platform: whether there are some platform error section or not + * @slidx: pointer of index of SAL error record + * @peidx: pointer of index of processor error section + * @pbci: pointer of pal_bus_check_info + * @sos: pointer to hand off struct between SAL and OS + * + * Return value: + * 1 on Success / 0 on Failure + */ + +static int +recover_from_processor_error(int platform, slidx_table_t *slidx, + peidx_table_t *peidx, pal_bus_check_info_t *pbci, + struct ia64_sal_os_state *sos) +{ + pal_processor_state_info_t *psp = + (pal_processor_state_info_t*)peidx_psp(peidx); + + /* + * Processor recovery status must key off of the PAL recovery + * status in the Processor State Parameter. + */ + + /* + * The machine check is corrected. + */ + if (psp->cm == 1) + return mca_recovered("machine check is already corrected."); + + /* + * The error was not contained. Software must be reset. + */ + if (psp->us || psp->ci == 0) + return fatal_mca("error not contained"); + + /* + * Look for recoverable TLB check + */ + if (psp->tc && !(psp->cc || psp->bc || psp->rc || psp->uc)) + return recover_from_tlb_check(peidx); + + /* + * The cache check and bus check bits have four possible states + * cc bc + * 1 1 Memory error, attempt recovery + * 1 0 Cache error, attempt recovery + * 0 1 I/O error, attempt recovery + * 0 0 Other error type, not recovered + */ + if (psp->cc == 0 && (psp->bc == 0 || pbci == NULL)) + return fatal_mca("No cache or bus check"); + + /* + * Cannot handle more than one bus check. + */ + if (peidx_bus_check_num(peidx) > 1) + return fatal_mca("Too many bus checks"); + + if (pbci->ib) + return fatal_mca("Internal Bus error"); + if (pbci->eb && pbci->bsi > 0) + return fatal_mca("External bus check fatal status"); + + /* + * This is a local MCA and estimated as a recoverable error. + */ + if (platform) + return recover_from_platform_error(slidx, peidx, pbci, sos); + + /* + * On account of strange SAL error record, we cannot recover. + */ + return fatal_mca("Strange SAL record"); +} + +/** + * mca_try_to_recover - Try to recover from MCA + * @rec: pointer to a SAL error record + * @sos: pointer to hand off struct between SAL and OS + * + * Return value: + * 1 on Success / 0 on Failure + */ + +static int +mca_try_to_recover(void *rec, struct ia64_sal_os_state *sos) +{ + int platform_err; + int n_proc_err; + slidx_table_t slidx; + peidx_table_t peidx; + pal_bus_check_info_t pbci; + + /* Make index of SAL error record */ + platform_err = mca_make_slidx(rec, &slidx); + + /* Count processor error sections */ + n_proc_err = slidx_count(&slidx, proc_err); + + /* Now, OS can recover when there is one processor error section */ + if (n_proc_err > 1) + return fatal_mca("Too Many Errors"); + else if (n_proc_err == 0) + /* Weird SAL record ... We can't do anything */ + return fatal_mca("Weird SAL record"); + + /* Make index of processor error section */ + mca_make_peidx((sal_log_processor_info_t*) + slidx_first_entry(&slidx.proc_err)->hdr, &peidx); + + /* Extract Processor BUS_CHECK[0] */ + *((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0); + + /* Check whether MCA is global or not */ + if (is_mca_global(&peidx, &pbci, sos)) + return fatal_mca("global MCA"); + + /* Try to recover a processor error */ + return recover_from_processor_error(platform_err, &slidx, &peidx, + &pbci, sos); +} + +/* + * ============================================================================= + */ + +int __init mca_external_handler_init(void) +{ + if (init_record_index_pools()) + return -ENOMEM; + + /* register external mca handlers */ + if (ia64_reg_MCA_extension(mca_try_to_recover)) { + printk(KERN_ERR "ia64_reg_MCA_extension failed.\n"); + kfree(slidx_pool.buffer); + return -EFAULT; + } + return 0; +} + +void __exit mca_external_handler_exit(void) +{ + /* unregister external mca handlers */ + ia64_unreg_MCA_extension(); + kfree(slidx_pool.buffer); +} + +module_init(mca_external_handler_init); +module_exit(mca_external_handler_exit); + +module_param(sal_rec_max, int, 0644); +MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record"); + +MODULE_DESCRIPTION("ia64 platform dependent mca handler driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3