/* * PowerNV OPAL high level interfaces * * Copyright 2011 IBM Corp. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #undef DEBUG #include <linux/types.h> #include <linux/of.h> #include <linux/of_fdt.h> #include <linux/of_platform.h> #include <linux/interrupt.h> #include <linux/notifier.h> #include <linux/slab.h> #include <linux/sched.h> #include <linux/kobject.h> #include <linux/delay.h> #include <linux/memblock.h> #include <asm/machdep.h> #include <asm/opal.h> #include <asm/firmware.h> #include <asm/mce.h> #include "powernv.h" /* /sys/firmware/opal */ struct kobject *opal_kobj; struct opal { u64 base; u64 entry; u64 size; } opal; struct mcheck_recoverable_range { u64 start_addr; u64 end_addr; u64 recover_addr; }; static struct mcheck_recoverable_range *mc_recoverable_range; static int mc_recoverable_range_len; struct device_node *opal_node; static DEFINE_SPINLOCK(opal_write_lock); extern u64 opal_mc_secondary_handler[]; static unsigned int *opal_irqs; static unsigned int opal_irq_count; static ATOMIC_NOTIFIER_HEAD(opal_notifier_head); static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; static DEFINE_SPINLOCK(opal_notifier_lock); static uint64_t last_notified_mask = 0x0ul; static atomic_t opal_notifier_hold = ATOMIC_INIT(0); static void opal_reinit_cores(void) { /* Do the actual re-init, This will clobber all FPRs, VRs, etc... * * It will preserve non volatile GPRs and HSPRG0/1. It will * also restore HIDs and other SPRs to their original value * but it might clobber a bunch. */ #ifdef __BIG_ENDIAN__ opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); #else opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); #endif } int __init early_init_dt_scan_opal(unsigned long node, const char *uname, int depth, void *data) { const void *basep, *entryp, *sizep; int basesz, entrysz, runtimesz; if (depth != 1 || strcmp(uname, "ibm,opal") != 0) return 0; basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); if (!basep || !entryp || !sizep) return 1; opal.base = of_read_number(basep, basesz/4); opal.entry = of_read_number(entryp, entrysz/4); opal.size = of_read_number(sizep, runtimesz/4); pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", opal.base, basep, basesz); pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", opal.entry, entryp, entrysz); pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", opal.size, sizep, runtimesz); powerpc_firmware_features |= FW_FEATURE_OPAL; if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { powerpc_firmware_features |= FW_FEATURE_OPALv2; powerpc_firmware_features |= FW_FEATURE_OPALv3; pr_info("OPAL V3 detected !\n"); } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) { powerpc_firmware_features |= FW_FEATURE_OPALv2; pr_info("OPAL V2 detected !\n"); } else { pr_info("OPAL V1 detected !\n"); } /* Reinit all cores with the right endian */ opal_reinit_cores(); /* Restore some bits */ if (cur_cpu_spec->cpu_restore) cur_cpu_spec->cpu_restore(); return 1; } int __init early_init_dt_scan_recoverable_ranges(unsigned long node, const char *uname, int depth, void *data) { int i, psize, size; const __be32 *prop; if (depth != 1 || strcmp(uname, "ibm,opal") != 0) return 0; prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); if (!prop) return 1; pr_debug("Found machine check recoverable ranges.\n"); /* * Calculate number of available entries. * * Each recoverable address range entry is (start address, len, * recovery address), 2 cells each for start and recovery address, * 1 cell for len, totalling 5 cells per entry. */ mc_recoverable_range_len = psize / (sizeof(*prop) * 5); /* Sanity check */ if (!mc_recoverable_range_len) return 1; /* Size required to hold all the entries. */ size = mc_recoverable_range_len * sizeof(struct mcheck_recoverable_range); /* * Allocate a buffer to hold the MC recoverable ranges. We would be * accessing them in real mode, hence it needs to be within * RMO region. */ mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), ppc64_rma_size)); memset(mc_recoverable_range, 0, size); for (i = 0; i < mc_recoverable_range_len; i++) { mc_recoverable_range[i].start_addr = of_read_number(prop + (i * 5) + 0, 2); mc_recoverable_range[i].end_addr = mc_recoverable_range[i].start_addr + of_read_number(prop + (i * 5) + 2, 1); mc_recoverable_range[i].recover_addr = of_read_number(prop + (i * 5) + 3, 2); pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", mc_recoverable_range[i].start_addr, mc_recoverable_range[i].end_addr, mc_recoverable_range[i].recover_addr); } return 1; } static int __init opal_register_exception_handlers(void) { #ifdef __BIG_ENDIAN__ u64 glue; if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) return -ENODEV; /* Hookup some exception handlers except machine check. We use the * fwnmi area at 0x7000 to provide the glue space to OPAL */ glue = 0x7000; /* * Check if we are running on newer firmware that exports * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch * the HMI interrupt and we catch it directly in Linux. * * For older firmware (i.e currently released POWER8 System Firmware * as of today <= SV810_087), we fallback to old behavior and let OPAL * patch the HMI vector and handle it inside OPAL firmware. * * For newer firmware (in development/yet to be released) we will * start catching/handling HMI directly in Linux. */ if (!opal_check_token(OPAL_HANDLE_HMI)) { pr_info("opal: Old firmware detected, OPAL handles HMIs.\n"); opal_register_exception_handler( OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 0, glue); glue += 128; } opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); #endif return 0; } machine_early_initcall(powernv, opal_register_exception_handlers); int opal_notifier_register(struct notifier_block *nb) { if (!nb) { pr_warning("%s: Invalid argument (%p)\n", __func__, nb); return -EINVAL; } atomic_notifier_chain_register(&opal_notifier_head, nb); return 0; } EXPORT_SYMBOL_GPL(opal_notifier_register); int opal_notifier_unregister(struct notifier_block *nb) { if (!nb) { pr_warning("%s: Invalid argument (%p)\n", __func__, nb); return -EINVAL; } atomic_notifier_chain_unregister(&opal_notifier_head, nb); return 0; } EXPORT_SYMBOL_GPL(opal_notifier_unregister); static void opal_do_notifier(uint64_t events) { unsigned long flags; uint64_t changed_mask; if (atomic_read(&opal_notifier_hold)) return; spin_lock_irqsave(&opal_notifier_lock, flags); changed_mask = last_notified_mask ^ events; last_notified_mask = events; spin_unlock_irqrestore(&opal_notifier_lock, flags); /* * We feed with the event bits and changed bits for * enough information to the callback. */ atomic_notifier_call_chain(&opal_notifier_head, events, (void *)changed_mask); } void opal_notifier_update_evt(uint64_t evt_mask, uint64_t evt_val) { unsigned long flags; spin_lock_irqsave(&opal_notifier_lock, flags); last_notified_mask &= ~evt_mask; last_notified_mask |= evt_val; spin_unlock_irqrestore(&opal_notifier_lock, flags); } void opal_notifier_enable(void) { int64_t rc; __be64 evt = 0; atomic_set(&opal_notifier_hold, 0); /* Process pending events */ rc = opal_poll_events(&evt); if (rc == OPAL_SUCCESS && evt) opal_do_notifier(be64_to_cpu(evt)); } void opal_notifier_disable(void) { atomic_set(&opal_notifier_hold, 1); } /* * Opal message notifier based on message type. Allow subscribers to get * notified for specific messgae type. */ int opal_message_notifier_register(enum OpalMessageType msg_type, struct notifier_block *nb) { if (!nb) { pr_warning("%s: Invalid argument (%p)\n", __func__, nb); return -EINVAL; } if (msg_type > OPAL_MSG_TYPE_MAX) { pr_warning("%s: Invalid message type argument (%d)\n", __func__, msg_type); return -EINVAL; } return atomic_notifier_chain_register( &opal_msg_notifier_head[msg_type], nb); } static void opal_message_do_notify(uint32_t msg_type, void *msg) { /* notify subscribers */ atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], msg_type, msg); } static void opal_handle_message(void) { s64 ret; /* * TODO: pre-allocate a message buffer depending on opal-msg-size * value in /proc/device-tree. */ static struct opal_msg msg; u32 type; ret = opal_get_msg(__pa(&msg), sizeof(msg)); /* No opal message pending. */ if (ret == OPAL_RESOURCE) return; /* check for errors. */ if (ret) { pr_warning("%s: Failed to retrieve opal message, err=%lld\n", __func__, ret); return; } type = be32_to_cpu(msg.msg_type); /* Sanity check */ if (type > OPAL_MSG_TYPE_MAX) { pr_warning("%s: Unknown message type: %u\n", __func__, type); return; } opal_message_do_notify(type, (void *)&msg); } static int opal_message_notify(struct notifier_block *nb, unsigned long events, void *change) { if (events & OPAL_EVENT_MSG_PENDING) opal_handle_message(); return 0; } static struct notifier_block opal_message_nb = { .notifier_call = opal_message_notify, .next = NULL, .priority = 0, }; static int __init opal_message_init(void) { int ret, i; for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); ret = opal_notifier_register(&opal_message_nb); if (ret) { pr_err("%s: Can't register OPAL event notifier (%d)\n", __func__, ret); return ret; } return 0; } machine_early_initcall(powernv, opal_message_init); int opal_get_chars(uint32_t vtermno, char *buf, int count) { s64 rc; __be64 evt, len; if (!opal.entry) return -ENODEV; opal_poll_events(&evt); if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) return 0; len = cpu_to_be64(count); rc = opal_console_read(vtermno, &len, buf); if (rc == OPAL_SUCCESS) return be64_to_cpu(len); return 0; } int opal_put_chars(uint32_t vtermno, const char *data, int total_len) { int written = 0; __be64 olen; s64 len, rc; unsigned long flags; __be64 evt; if (!opal.entry) return -ENODEV; /* We want put_chars to be atomic to avoid mangling of hvsi * packets. To do that, we first test for room and return * -EAGAIN if there isn't enough. * * Unfortunately, opal_console_write_buffer_space() doesn't * appear to work on opal v1, so we just assume there is * enough room and be done with it */ spin_lock_irqsave(&opal_write_lock, flags); if (firmware_has_feature(FW_FEATURE_OPALv2)) { rc = opal_console_write_buffer_space(vtermno, &olen); len = be64_to_cpu(olen); if (rc || len < total_len) { spin_unlock_irqrestore(&opal_write_lock, flags); /* Closed -> drop characters */ if (rc) return total_len; opal_poll_events(NULL); return -EAGAIN; } } /* We still try to handle partial completions, though they * should no longer happen. */ rc = OPAL_BUSY; while(total_len > 0 && (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { olen = cpu_to_be64(total_len); rc = opal_console_write(vtermno, &olen, data); len = be64_to_cpu(olen); /* Closed or other error drop */ if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && rc != OPAL_BUSY_EVENT) { written = total_len; break; } if (rc == OPAL_SUCCESS) { total_len -= len; data += len; written += len; } /* This is a bit nasty but we need that for the console to * flush when there aren't any interrupts. We will clean * things a bit later to limit that to synchronous path * such as the kernel console and xmon/udbg */ do opal_poll_events(&evt); while(rc == OPAL_SUCCESS && (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); } spin_unlock_irqrestore(&opal_write_lock, flags); return written; } static int opal_recover_mce(struct pt_regs *regs, struct machine_check_event *evt) { int recovered = 0; uint64_t ea = get_mce_fault_addr(evt); if (!(regs->msr & MSR_RI)) { /* If MSR_RI isn't set, we cannot recover */ recovered = 0; } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { /* Platform corrected itself */ recovered = 1; } else if (ea && !is_kernel_addr(ea)) { /* * Faulting address is not in kernel text. We should be fine. * We need to find which process uses this address. * For now, kill the task if we have received exception when * in userspace. * * TODO: Queue up this address for hwpoisioning later. */ if (user_mode(regs) && !is_global_init(current)) { _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); recovered = 1; } else recovered = 0; } else if (user_mode(regs) && !is_global_init(current) && evt->severity == MCE_SEV_ERROR_SYNC) { /* * If we have received a synchronous error when in userspace * kill the task. */ _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); recovered = 1; } return recovered; } int opal_machine_check(struct pt_regs *regs) { struct machine_check_event evt; if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) return 0; /* Print things out */ if (evt.version != MCE_V1) { pr_err("Machine Check Exception, Unknown event version %d !\n", evt.version); return 0; } machine_check_print_event_info(&evt); if (opal_recover_mce(regs, &evt)) return 1; return 0; } /* Early hmi handler called in real mode. */ int opal_hmi_exception_early(struct pt_regs *regs) { s64 rc; /* * call opal hmi handler. Pass paca address as token. * The return value OPAL_SUCCESS is an indication that there is * an HMI event generated waiting to pull by Linux. */ rc = opal_handle_hmi(); if (rc == OPAL_SUCCESS) { local_paca->hmi_event_available = 1; return 1; } return 0; } /* HMI exception handler called in virtual mode during check_irq_replay. */ int opal_handle_hmi_exception(struct pt_regs *regs) { s64 rc; __be64 evt = 0; /* * Check if HMI event is available. * if Yes, then call opal_poll_events to pull opal messages and * process them. */ if (!local_paca->hmi_event_available) return 0; local_paca->hmi_event_available = 0; rc = opal_poll_events(&evt); if (rc == OPAL_SUCCESS && evt) opal_do_notifier(be64_to_cpu(evt)); return 1; } static uint64_t find_recovery_address(uint64_t nip) { int i; for (i = 0; i < mc_recoverable_range_len; i++) if ((nip >= mc_recoverable_range[i].start_addr) && (nip < mc_recoverable_range[i].end_addr)) return mc_recoverable_range[i].recover_addr; return 0; } bool opal_mce_check_early_recovery(struct pt_regs *regs) { uint64_t recover_addr = 0; if (!opal.base || !opal.size) goto out; if ((regs->nip >= opal.base) && (regs->nip <= (opal.base + opal.size))) recover_addr = find_recovery_address(regs->nip); /* * Setup regs->nip to rfi into fixup address. */ if (recover_addr) regs->nip = recover_addr; out: return !!recover_addr; } static irqreturn_t opal_interrupt(int irq, void *data) { __be64 events; opal_handle_interrupt(virq_to_hw(irq), &events); opal_do_notifier(be64_to_cpu(events)); return IRQ_HANDLED; } static int opal_sysfs_init(void) { opal_kobj = kobject_create_and_add("opal", firmware_kobj); if (!opal_kobj) { pr_warn("kobject_create_and_add opal failed\n"); return -ENOMEM; } return 0; } static void __init opal_dump_region_init(void) { void *addr; uint64_t size; int rc; /* Register kernel log buffer */ addr = log_buf_addr_get(); size = log_buf_len_get(); rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, __pa(addr), size); /* Don't warn if this is just an older OPAL that doesn't * know about that call */ if (rc && rc != OPAL_UNSUPPORTED) pr_warn("DUMP: Failed to register kernel log buffer. " "rc = %d\n", rc); } static int __init opal_init(void) { struct device_node *np, *consoles; const __be32 *irqs; int rc, i, irqlen; opal_node = of_find_node_by_path("/ibm,opal"); if (!opal_node) { pr_warn("opal: Node not found\n"); return -ENODEV; } /* Register OPAL consoles if any ports */ if (firmware_has_feature(FW_FEATURE_OPALv2)) consoles = of_find_node_by_path("/ibm,opal/consoles"); else consoles = of_node_get(opal_node); if (consoles) { for_each_child_of_node(consoles, np) { if (strcmp(np->name, "serial")) continue; of_platform_device_create(np, NULL, NULL); } of_node_put(consoles); } /* Find all OPAL interrupts and request them */ irqs = of_get_property(opal_node, "opal-interrupts", &irqlen); pr_debug("opal: Found %d interrupts reserved for OPAL\n", irqs ? (irqlen / 4) : 0); opal_irq_count = irqlen / 4; opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL); for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) { unsigned int hwirq = be32_to_cpup(irqs); unsigned int irq = irq_create_mapping(NULL, hwirq); if (irq == NO_IRQ) { pr_warning("opal: Failed to map irq 0x%x\n", hwirq); continue; } rc = request_irq(irq, opal_interrupt, 0, "opal", NULL); if (rc) pr_warning("opal: Error %d requesting irq %d" " (0x%x)\n", rc, irq, hwirq); opal_irqs[i] = irq; } /* Create "opal" kobject under /sys/firmware */ rc = opal_sysfs_init(); if (rc == 0) { /* Setup dump region interface */ opal_dump_region_init(); /* Setup error log interface */ rc = opal_elog_init(); /* Setup code update interface */ opal_flash_init(); /* Setup platform dump extract interface */ opal_platform_dump_init(); /* Setup system parameters interface */ opal_sys_param_init(); /* Setup message log interface. */ opal_msglog_init(); } return 0; } machine_subsys_initcall(powernv, opal_init); void opal_shutdown(void) { unsigned int i; long rc = OPAL_BUSY; /* First free interrupts, which will also mask them */ for (i = 0; i < opal_irq_count; i++) { if (opal_irqs[i]) free_irq(opal_irqs[i], NULL); opal_irqs[i] = 0; } /* * Then sync with OPAL which ensure anything that can * potentially write to our memory has completed such * as an ongoing dump retrieval */ while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { rc = opal_sync_host_reboot(); if (rc == OPAL_BUSY) opal_poll_events(NULL); else mdelay(10); } /* Unregister memory dump region */ opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); } /* Export this so that test modules can use it */ EXPORT_SYMBOL_GPL(opal_invalid_call); /* Convert a region of vmalloc memory to an opal sg list */ struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, unsigned long vmalloc_size) { struct opal_sg_list *sg, *first = NULL; unsigned long i = 0; sg = kzalloc(PAGE_SIZE, GFP_KERNEL); if (!sg) goto nomem; first = sg; while (vmalloc_size > 0) { uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; uint64_t length = min(vmalloc_size, PAGE_SIZE); sg->entry[i].data = cpu_to_be64(data); sg->entry[i].length = cpu_to_be64(length); i++; if (i >= SG_ENTRIES_PER_NODE) { struct opal_sg_list *next; next = kzalloc(PAGE_SIZE, GFP_KERNEL); if (!next) goto nomem; sg->length = cpu_to_be64( i * sizeof(struct opal_sg_entry) + 16); i = 0; sg->next = cpu_to_be64(__pa(next)); sg = next; } vmalloc_addr += length; vmalloc_size -= length; } sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); return first; nomem: pr_err("%s : Failed to allocate memory\n", __func__); opal_free_sg_list(first); return NULL; } void opal_free_sg_list(struct opal_sg_list *sg) { while (sg) { uint64_t next = be64_to_cpu(sg->next); kfree(sg); if (next) sg = __va(next); else sg = NULL; } }