| /* |
| * 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. |
| */ |
| |
| #define pr_fmt(fmt) "opal: " fmt |
| |
| #include <linux/printk.h> |
| #include <linux/types.h> |
| #include <linux/of.h> |
| #include <linux/of_fdt.h> |
| #include <linux/of_platform.h> |
| #include <linux/of_address.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 <linux/kthread.h> |
| #include <linux/freezer.h> |
| #include <linux/printk.h> |
| #include <linux/kmsg_dump.h> |
| #include <linux/console.h> |
| #include <linux/sched/debug.h> |
| |
| #include <asm/machdep.h> |
| #include <asm/opal.h> |
| #include <asm/firmware.h> |
| #include <asm/mce.h> |
| #include <asm/imc-pmu.h> |
| #include <asm/bug.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); |
| static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; |
| static uint32_t opal_heartbeat; |
| static struct task_struct *kopald_tsk; |
| |
| void opal_configure_cores(void) |
| { |
| u64 reinit_flags = 0; |
| |
| /* 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__ |
| reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; |
| #else |
| reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; |
| #endif |
| |
| /* |
| * POWER9 always support running hash: |
| * ie. Host hash supports hash guests |
| * Host radix supports hash/radix guests |
| */ |
| if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { |
| reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; |
| if (early_radix_enabled()) |
| reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; |
| } |
| |
| opal_reinit_cpus(reinit_flags); |
| |
| /* Restore some bits */ |
| if (cur_cpu_spec->cpu_restore) |
| cur_cpu_spec->cpu_restore(); |
| } |
| |
| 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); |
| |
| if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { |
| powerpc_firmware_features |= FW_FEATURE_OPAL; |
| pr_debug("OPAL detected !\n"); |
| } else { |
| panic("OPAL != V3 detected, no longer supported.\n"); |
| } |
| |
| 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. |
| */ |
| mc_recoverable_range =__va(memblock_phys_alloc(size, __alignof__(u64))); |
| 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("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); |
| |
| /* |
| * Opal message notifier based on message type. Allow subscribers to get |
| * notified for specific messgae type. |
| */ |
| int opal_message_notifier_register(enum opal_msg_type msg_type, |
| struct notifier_block *nb) |
| { |
| if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { |
| pr_warn("%s: Invalid arguments, msg_type:%d\n", |
| __func__, msg_type); |
| return -EINVAL; |
| } |
| |
| return atomic_notifier_chain_register( |
| &opal_msg_notifier_head[msg_type], nb); |
| } |
| EXPORT_SYMBOL_GPL(opal_message_notifier_register); |
| |
| int opal_message_notifier_unregister(enum opal_msg_type msg_type, |
| struct notifier_block *nb) |
| { |
| return atomic_notifier_chain_unregister( |
| &opal_msg_notifier_head[msg_type], nb); |
| } |
| EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); |
| |
| 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_warn("%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_warn_once("%s: Unknown message type: %u\n", __func__, type); |
| return; |
| } |
| opal_message_do_notify(type, (void *)&msg); |
| } |
| |
| static irqreturn_t opal_message_notify(int irq, void *data) |
| { |
| opal_handle_message(); |
| return IRQ_HANDLED; |
| } |
| |
| static int __init opal_message_init(void) |
| { |
| int ret, i, irq; |
| |
| for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) |
| ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); |
| |
| irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); |
| if (!irq) { |
| pr_err("%s: Can't register OPAL event irq (%d)\n", |
| __func__, irq); |
| return irq; |
| } |
| |
| ret = request_irq(irq, opal_message_notify, |
| IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); |
| if (ret) { |
| pr_err("%s: Can't request OPAL event irq (%d)\n", |
| __func__, ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| static int __opal_put_chars(uint32_t vtermno, const char *data, int total_len, bool atomic) |
| { |
| unsigned long flags = 0 /* shut up gcc */; |
| int written; |
| __be64 olen; |
| s64 rc; |
| |
| if (!opal.entry) |
| return -ENODEV; |
| |
| if (atomic) |
| spin_lock_irqsave(&opal_write_lock, flags); |
| rc = opal_console_write_buffer_space(vtermno, &olen); |
| if (rc || be64_to_cpu(olen) < total_len) { |
| /* Closed -> drop characters */ |
| if (rc) |
| written = total_len; |
| else |
| written = -EAGAIN; |
| goto out; |
| } |
| |
| /* Should not get a partial write here because space is available. */ |
| olen = cpu_to_be64(total_len); |
| rc = opal_console_write(vtermno, &olen, data); |
| if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { |
| if (rc == OPAL_BUSY_EVENT) |
| opal_poll_events(NULL); |
| written = -EAGAIN; |
| goto out; |
| } |
| |
| /* Closed or other error drop */ |
| if (rc != OPAL_SUCCESS) { |
| written = opal_error_code(rc); |
| goto out; |
| } |
| |
| written = be64_to_cpu(olen); |
| if (written < total_len) { |
| if (atomic) { |
| /* Should not happen */ |
| pr_warn("atomic console write returned partial " |
| "len=%d written=%d\n", total_len, written); |
| } |
| if (!written) |
| written = -EAGAIN; |
| } |
| |
| out: |
| if (atomic) |
| spin_unlock_irqrestore(&opal_write_lock, flags); |
| |
| return written; |
| } |
| |
| int opal_put_chars(uint32_t vtermno, const char *data, int total_len) |
| { |
| return __opal_put_chars(vtermno, data, total_len, false); |
| } |
| |
| /* |
| * opal_put_chars_atomic will not perform partial-writes. Data will be |
| * atomically written to the terminal or not at all. This is not strictly |
| * true at the moment because console space can race with OPAL's console |
| * writes. |
| */ |
| int opal_put_chars_atomic(uint32_t vtermno, const char *data, int total_len) |
| { |
| return __opal_put_chars(vtermno, data, total_len, true); |
| } |
| |
| static s64 __opal_flush_console(uint32_t vtermno) |
| { |
| s64 rc; |
| |
| if (!opal_check_token(OPAL_CONSOLE_FLUSH)) { |
| __be64 evt; |
| |
| /* |
| * If OPAL_CONSOLE_FLUSH is not implemented in the firmware, |
| * the console can still be flushed by calling the polling |
| * function while it has OPAL_EVENT_CONSOLE_OUTPUT events. |
| */ |
| WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n"); |
| |
| opal_poll_events(&evt); |
| if (!(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)) |
| return OPAL_SUCCESS; |
| return OPAL_BUSY; |
| |
| } else { |
| rc = opal_console_flush(vtermno); |
| if (rc == OPAL_BUSY_EVENT) { |
| opal_poll_events(NULL); |
| rc = OPAL_BUSY; |
| } |
| return rc; |
| } |
| |
| } |
| |
| /* |
| * opal_flush_console spins until the console is flushed |
| */ |
| int opal_flush_console(uint32_t vtermno) |
| { |
| for (;;) { |
| s64 rc = __opal_flush_console(vtermno); |
| |
| if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { |
| mdelay(1); |
| continue; |
| } |
| |
| return opal_error_code(rc); |
| } |
| } |
| |
| /* |
| * opal_flush_chars is an hvc interface that sleeps until the console is |
| * flushed if wait, otherwise it will return -EBUSY if the console has data, |
| * -EAGAIN if it has data and some of it was flushed. |
| */ |
| int opal_flush_chars(uint32_t vtermno, bool wait) |
| { |
| for (;;) { |
| s64 rc = __opal_flush_console(vtermno); |
| |
| if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { |
| if (wait) { |
| msleep(OPAL_BUSY_DELAY_MS); |
| continue; |
| } |
| if (rc == OPAL_PARTIAL) |
| return -EAGAIN; |
| } |
| |
| return opal_error_code(rc); |
| } |
| } |
| |
| static int opal_recover_mce(struct pt_regs *regs, |
| struct machine_check_event *evt) |
| { |
| int recovered = 0; |
| |
| if (!(regs->msr & MSR_RI)) { |
| /* If MSR_RI isn't set, we cannot recover */ |
| pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); |
| recovered = 0; |
| } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { |
| /* Platform corrected itself */ |
| recovered = 1; |
| } else if (evt->severity == MCE_SEV_FATAL) { |
| /* Fatal machine check */ |
| pr_err("Machine check interrupt is fatal\n"); |
| recovered = 0; |
| } |
| |
| if (!recovered && evt->severity == MCE_SEV_ERROR_SYNC) { |
| /* |
| * Try to kill processes if we get a synchronous machine check |
| * (e.g., one caused by execution of this instruction). This |
| * will devolve into a panic if we try to kill init or are in |
| * an interrupt etc. |
| * |
| * TODO: Queue up this address for hwpoisioning later. |
| * TODO: This is not quite right for d-side machine |
| * checks ->nip is not necessarily the important |
| * address. |
| */ |
| if ((user_mode(regs))) { |
| _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); |
| recovered = 1; |
| } else if (die_will_crash()) { |
| /* |
| * die() would kill the kernel, so better to go via |
| * the platform reboot code that will log the |
| * machine check. |
| */ |
| recovered = 0; |
| } else { |
| die("Machine check", regs, SIGBUS); |
| recovered = 1; |
| } |
| } |
| |
| return recovered; |
| } |
| |
| void __noreturn pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) |
| { |
| panic_flush_kmsg_start(); |
| |
| pr_emerg("Hardware platform error: %s\n", msg); |
| if (regs) |
| show_regs(regs); |
| smp_send_stop(); |
| |
| panic_flush_kmsg_end(); |
| |
| /* |
| * Don't bother to shut things down because this will |
| * xstop the system. |
| */ |
| if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) |
| == OPAL_UNSUPPORTED) { |
| pr_emerg("Reboot type %d not supported for %s\n", |
| OPAL_REBOOT_PLATFORM_ERROR, msg); |
| } |
| |
| /* |
| * We reached here. There can be three possibilities: |
| * 1. We are running on a firmware level that do not support |
| * opal_cec_reboot2() |
| * 2. We are running on a firmware level that do not support |
| * OPAL_REBOOT_PLATFORM_ERROR reboot type. |
| * 3. We are running on FSP based system that does not need |
| * opal to trigger checkstop explicitly for error analysis. |
| * The FSP PRD component would have already got notified |
| * about this error through other channels. |
| * 4. We are running on a newer skiboot that by default does |
| * not cause a checkstop, drops us back to the kernel to |
| * extract context and state at the time of the error. |
| */ |
| |
| panic(msg); |
| } |
| |
| 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, user_mode(regs)); |
| |
| if (opal_recover_mce(regs, &evt)) |
| return 1; |
| |
| pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); |
| } |
| |
| /* 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) |
| { |
| /* |
| * Check if HMI event is available. |
| * if Yes, then wake kopald to process them. |
| */ |
| if (!local_paca->hmi_event_available) |
| return 0; |
| |
| local_paca->hmi_event_available = 0; |
| opal_wake_poller(); |
| |
| 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 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 ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, |
| struct bin_attribute *bin_attr, |
| char *buf, loff_t off, size_t count) |
| { |
| return memory_read_from_buffer(buf, count, &off, bin_attr->private, |
| bin_attr->size); |
| } |
| |
| static BIN_ATTR_RO(symbol_map, 0); |
| |
| static void opal_export_symmap(void) |
| { |
| const __be64 *syms; |
| unsigned int size; |
| struct device_node *fw; |
| int rc; |
| |
| fw = of_find_node_by_path("/ibm,opal/firmware"); |
| if (!fw) |
| return; |
| syms = of_get_property(fw, "symbol-map", &size); |
| if (!syms || size != 2 * sizeof(__be64)) |
| return; |
| |
| /* Setup attributes */ |
| bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); |
| bin_attr_symbol_map.size = be64_to_cpu(syms[1]); |
| |
| rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); |
| if (rc) |
| pr_warn("Error %d creating OPAL symbols file\n", rc); |
| } |
| |
| static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, |
| struct bin_attribute *bin_attr, char *buf, |
| loff_t off, size_t count) |
| { |
| return memory_read_from_buffer(buf, count, &off, bin_attr->private, |
| bin_attr->size); |
| } |
| |
| /* |
| * opal_export_attrs: creates a sysfs node for each property listed in |
| * the device-tree under /ibm,opal/firmware/exports/ |
| * All new sysfs nodes are created under /opal/exports/. |
| * This allows for reserved memory regions (e.g. HDAT) to be read. |
| * The new sysfs nodes are only readable by root. |
| */ |
| static void opal_export_attrs(void) |
| { |
| struct bin_attribute *attr; |
| struct device_node *np; |
| struct property *prop; |
| struct kobject *kobj; |
| u64 vals[2]; |
| int rc; |
| |
| np = of_find_node_by_path("/ibm,opal/firmware/exports"); |
| if (!np) |
| return; |
| |
| /* Create new 'exports' directory - /sys/firmware/opal/exports */ |
| kobj = kobject_create_and_add("exports", opal_kobj); |
| if (!kobj) { |
| pr_warn("kobject_create_and_add() of exports failed\n"); |
| return; |
| } |
| |
| for_each_property_of_node(np, prop) { |
| if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) |
| continue; |
| |
| if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) |
| continue; |
| |
| attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
| |
| if (attr == NULL) { |
| pr_warn("Failed kmalloc for bin_attribute!"); |
| continue; |
| } |
| |
| sysfs_bin_attr_init(attr); |
| attr->attr.name = kstrdup(prop->name, GFP_KERNEL); |
| attr->attr.mode = 0400; |
| attr->read = export_attr_read; |
| attr->private = __va(vals[0]); |
| attr->size = vals[1]; |
| |
| if (attr->attr.name == NULL) { |
| pr_warn("Failed kstrdup for bin_attribute attr.name"); |
| kfree(attr); |
| continue; |
| } |
| |
| rc = sysfs_create_bin_file(kobj, attr); |
| if (rc) { |
| pr_warn("Error %d creating OPAL sysfs exports/%s file\n", |
| rc, prop->name); |
| kfree(attr->attr.name); |
| kfree(attr); |
| } |
| } |
| |
| of_node_put(np); |
| } |
| |
| static void __init opal_dump_region_init(void) |
| { |
| void *addr; |
| uint64_t size; |
| int rc; |
| |
| if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) |
| return; |
| |
| /* Register kernel log buffer */ |
| addr = log_buf_addr_get(); |
| if (addr == NULL) |
| return; |
| |
| size = log_buf_len_get(); |
| if (size == 0) |
| return; |
| |
| 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 void opal_pdev_init(const char *compatible) |
| { |
| struct device_node *np; |
| |
| for_each_compatible_node(np, NULL, compatible) |
| of_platform_device_create(np, NULL, NULL); |
| } |
| |
| static void __init opal_imc_init_dev(void) |
| { |
| struct device_node *np; |
| |
| np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); |
| if (np) |
| of_platform_device_create(np, NULL, NULL); |
| } |
| |
| static int kopald(void *unused) |
| { |
| unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; |
| |
| set_freezable(); |
| do { |
| try_to_freeze(); |
| |
| opal_handle_events(); |
| |
| set_current_state(TASK_INTERRUPTIBLE); |
| if (opal_have_pending_events()) |
| __set_current_state(TASK_RUNNING); |
| else |
| schedule_timeout(timeout); |
| |
| } while (!kthread_should_stop()); |
| |
| return 0; |
| } |
| |
| void opal_wake_poller(void) |
| { |
| if (kopald_tsk) |
| wake_up_process(kopald_tsk); |
| } |
| |
| static void opal_init_heartbeat(void) |
| { |
| /* Old firwmware, we assume the HVC heartbeat is sufficient */ |
| if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", |
| &opal_heartbeat) != 0) |
| opal_heartbeat = 0; |
| |
| if (opal_heartbeat) |
| kopald_tsk = kthread_run(kopald, NULL, "kopald"); |
| } |
| |
| static int __init opal_init(void) |
| { |
| struct device_node *np, *consoles, *leds; |
| int rc; |
| |
| opal_node = of_find_node_by_path("/ibm,opal"); |
| if (!opal_node) { |
| pr_warn("Device node not found\n"); |
| return -ENODEV; |
| } |
| |
| /* Register OPAL consoles if any ports */ |
| consoles = of_find_node_by_path("/ibm,opal/consoles"); |
| if (consoles) { |
| for_each_child_of_node(consoles, np) { |
| if (!of_node_name_eq(np, "serial")) |
| continue; |
| of_platform_device_create(np, NULL, NULL); |
| } |
| of_node_put(consoles); |
| } |
| |
| /* Initialise OPAL messaging system */ |
| opal_message_init(); |
| |
| /* Initialise OPAL asynchronous completion interface */ |
| opal_async_comp_init(); |
| |
| /* Initialise OPAL sensor interface */ |
| opal_sensor_init(); |
| |
| /* Initialise OPAL hypervisor maintainence interrupt handling */ |
| opal_hmi_handler_init(); |
| |
| /* Create i2c platform devices */ |
| opal_pdev_init("ibm,opal-i2c"); |
| |
| /* Handle non-volatile memory devices */ |
| opal_pdev_init("pmem-region"); |
| |
| /* Setup a heatbeat thread if requested by OPAL */ |
| opal_init_heartbeat(); |
| |
| /* Detect In-Memory Collection counters and create devices*/ |
| opal_imc_init_dev(); |
| |
| /* Create leds platform devices */ |
| leds = of_find_node_by_path("/ibm,opal/leds"); |
| if (leds) { |
| of_platform_device_create(leds, "opal_leds", NULL); |
| of_node_put(leds); |
| } |
| |
| /* Initialise OPAL message log interface */ |
| opal_msglog_init(); |
| |
| /* Create "opal" kobject under /sys/firmware */ |
| rc = opal_sysfs_init(); |
| if (rc == 0) { |
| /* Export symbol map to userspace */ |
| opal_export_symmap(); |
| /* Setup dump region interface */ |
| opal_dump_region_init(); |
| /* Setup error log interface */ |
| rc = opal_elog_init(); |
| /* Setup code update interface */ |
| opal_flash_update_init(); |
| /* Setup platform dump extract interface */ |
| opal_platform_dump_init(); |
| /* Setup system parameters interface */ |
| opal_sys_param_init(); |
| /* Setup message log sysfs interface. */ |
| opal_msglog_sysfs_init(); |
| } |
| |
| /* Export all properties */ |
| opal_export_attrs(); |
| |
| /* Initialize platform devices: IPMI backend, PRD & flash interface */ |
| opal_pdev_init("ibm,opal-ipmi"); |
| opal_pdev_init("ibm,opal-flash"); |
| opal_pdev_init("ibm,opal-prd"); |
| |
| /* Initialise platform device: oppanel interface */ |
| opal_pdev_init("ibm,opal-oppanel"); |
| |
| /* Initialise OPAL kmsg dumper for flushing console on panic */ |
| opal_kmsg_init(); |
| |
| /* Initialise OPAL powercap interface */ |
| opal_powercap_init(); |
| |
| /* Initialise OPAL Power-Shifting-Ratio interface */ |
| opal_psr_init(); |
| |
| /* Initialise OPAL sensor groups */ |
| opal_sensor_groups_init(); |
| |
| /* Initialise OPAL Power control interface */ |
| opal_power_control_init(); |
| |
| return 0; |
| } |
| machine_subsys_initcall(powernv, opal_init); |
| |
| void opal_shutdown(void) |
| { |
| long rc = OPAL_BUSY; |
| |
| opal_event_shutdown(); |
| |
| /* |
| * 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 */ |
| if (opal_check_token(OPAL_UNREGISTER_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); |
| EXPORT_SYMBOL_GPL(opal_xscom_read); |
| EXPORT_SYMBOL_GPL(opal_xscom_write); |
| EXPORT_SYMBOL_GPL(opal_ipmi_send); |
| EXPORT_SYMBOL_GPL(opal_ipmi_recv); |
| EXPORT_SYMBOL_GPL(opal_flash_read); |
| EXPORT_SYMBOL_GPL(opal_flash_write); |
| EXPORT_SYMBOL_GPL(opal_flash_erase); |
| EXPORT_SYMBOL_GPL(opal_prd_msg); |
| EXPORT_SYMBOL_GPL(opal_check_token); |
| |
| /* 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; |
| } |
| } |
| |
| int opal_error_code(int rc) |
| { |
| switch (rc) { |
| case OPAL_SUCCESS: return 0; |
| |
| case OPAL_PARAMETER: return -EINVAL; |
| case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; |
| case OPAL_BUSY: |
| case OPAL_BUSY_EVENT: return -EBUSY; |
| case OPAL_NO_MEM: return -ENOMEM; |
| case OPAL_PERMISSION: return -EPERM; |
| |
| case OPAL_UNSUPPORTED: return -EIO; |
| case OPAL_HARDWARE: return -EIO; |
| case OPAL_INTERNAL_ERROR: return -EIO; |
| case OPAL_TIMEOUT: return -ETIMEDOUT; |
| default: |
| pr_err("%s: unexpected OPAL error %d\n", __func__, rc); |
| return -EIO; |
| } |
| } |
| |
| void powernv_set_nmmu_ptcr(unsigned long ptcr) |
| { |
| int rc; |
| |
| if (firmware_has_feature(FW_FEATURE_OPAL)) { |
| rc = opal_nmmu_set_ptcr(-1UL, ptcr); |
| if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) |
| pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); |
| } |
| } |
| |
| EXPORT_SYMBOL_GPL(opal_poll_events); |
| EXPORT_SYMBOL_GPL(opal_rtc_read); |
| EXPORT_SYMBOL_GPL(opal_rtc_write); |
| EXPORT_SYMBOL_GPL(opal_tpo_read); |
| EXPORT_SYMBOL_GPL(opal_tpo_write); |
| EXPORT_SYMBOL_GPL(opal_i2c_request); |
| /* Export these symbols for PowerNV LED class driver */ |
| EXPORT_SYMBOL_GPL(opal_leds_get_ind); |
| EXPORT_SYMBOL_GPL(opal_leds_set_ind); |
| /* Export this symbol for PowerNV Operator Panel class driver */ |
| EXPORT_SYMBOL_GPL(opal_write_oppanel_async); |
| /* Export this for KVM */ |
| EXPORT_SYMBOL_GPL(opal_int_set_mfrr); |
| EXPORT_SYMBOL_GPL(opal_int_eoi); |
| EXPORT_SYMBOL_GPL(opal_error_code); |
| /* Export the below symbol for NX compression */ |
| EXPORT_SYMBOL(opal_nx_coproc_init); |