2 * PowerNV OPAL high level interfaces
4 * Copyright 2011 IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #define pr_fmt(fmt) "opal: " fmt
14 #include <linux/printk.h>
15 #include <linux/types.h>
17 #include <linux/of_fdt.h>
18 #include <linux/of_platform.h>
19 #include <linux/of_address.h>
20 #include <linux/interrupt.h>
21 #include <linux/notifier.h>
22 #include <linux/slab.h>
23 #include <linux/sched.h>
24 #include <linux/kobject.h>
25 #include <linux/delay.h>
26 #include <linux/memblock.h>
27 #include <linux/kthread.h>
28 #include <linux/freezer.h>
29 #include <linux/printk.h>
30 #include <linux/kmsg_dump.h>
31 #include <linux/console.h>
32 #include <linux/sched/debug.h>
34 #include <asm/machdep.h>
36 #include <asm/firmware.h>
38 #include <asm/imc-pmu.h>
43 /* /sys/firmware/opal */
44 struct kobject *opal_kobj;
52 struct mcheck_recoverable_range {
58 static struct mcheck_recoverable_range *mc_recoverable_range;
59 static int mc_recoverable_range_len;
61 struct device_node *opal_node;
62 static DEFINE_SPINLOCK(opal_write_lock);
63 static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
64 static uint32_t opal_heartbeat;
65 static struct task_struct *kopald_tsk;
67 void opal_configure_cores(void)
71 /* Do the actual re-init, This will clobber all FPRs, VRs, etc...
73 * It will preserve non volatile GPRs and HSPRG0/1. It will
74 * also restore HIDs and other SPRs to their original value
75 * but it might clobber a bunch.
78 reinit_flags |= OPAL_REINIT_CPUS_HILE_BE;
80 reinit_flags |= OPAL_REINIT_CPUS_HILE_LE;
84 * POWER9 always support running hash:
85 * ie. Host hash supports hash guests
86 * Host radix supports hash/radix guests
88 if (early_cpu_has_feature(CPU_FTR_ARCH_300)) {
89 reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH;
90 if (early_radix_enabled())
91 reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX;
94 opal_reinit_cpus(reinit_flags);
96 /* Restore some bits */
97 if (cur_cpu_spec->cpu_restore)
98 cur_cpu_spec->cpu_restore();
101 int __init early_init_dt_scan_opal(unsigned long node,
102 const char *uname, int depth, void *data)
104 const void *basep, *entryp, *sizep;
105 int basesz, entrysz, runtimesz;
107 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
110 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
111 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
112 sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz);
114 if (!basep || !entryp || !sizep)
117 opal.base = of_read_number(basep, basesz/4);
118 opal.entry = of_read_number(entryp, entrysz/4);
119 opal.size = of_read_number(sizep, runtimesz/4);
121 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n",
122 opal.base, basep, basesz);
123 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n",
124 opal.entry, entryp, entrysz);
125 pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n",
126 opal.size, sizep, runtimesz);
128 if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
129 powerpc_firmware_features |= FW_FEATURE_OPAL;
130 pr_debug("OPAL detected !\n");
132 panic("OPAL != V3 detected, no longer supported.\n");
138 int __init early_init_dt_scan_recoverable_ranges(unsigned long node,
139 const char *uname, int depth, void *data)
144 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
147 prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize);
152 pr_debug("Found machine check recoverable ranges.\n");
155 * Calculate number of available entries.
157 * Each recoverable address range entry is (start address, len,
158 * recovery address), 2 cells each for start and recovery address,
159 * 1 cell for len, totalling 5 cells per entry.
161 mc_recoverable_range_len = psize / (sizeof(*prop) * 5);
164 if (!mc_recoverable_range_len)
167 /* Size required to hold all the entries. */
168 size = mc_recoverable_range_len *
169 sizeof(struct mcheck_recoverable_range);
172 * Allocate a buffer to hold the MC recoverable ranges.
174 mc_recoverable_range =__va(memblock_alloc(size, __alignof__(u64)));
175 memset(mc_recoverable_range, 0, size);
177 for (i = 0; i < mc_recoverable_range_len; i++) {
178 mc_recoverable_range[i].start_addr =
179 of_read_number(prop + (i * 5) + 0, 2);
180 mc_recoverable_range[i].end_addr =
181 mc_recoverable_range[i].start_addr +
182 of_read_number(prop + (i * 5) + 2, 1);
183 mc_recoverable_range[i].recover_addr =
184 of_read_number(prop + (i * 5) + 3, 2);
186 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n",
187 mc_recoverable_range[i].start_addr,
188 mc_recoverable_range[i].end_addr,
189 mc_recoverable_range[i].recover_addr);
194 static int __init opal_register_exception_handlers(void)
196 #ifdef __BIG_ENDIAN__
199 if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
202 /* Hookup some exception handlers except machine check. We use the
203 * fwnmi area at 0x7000 to provide the glue space to OPAL
208 * Check if we are running on newer firmware that exports
209 * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch
210 * the HMI interrupt and we catch it directly in Linux.
212 * For older firmware (i.e currently released POWER8 System Firmware
213 * as of today <= SV810_087), we fallback to old behavior and let OPAL
214 * patch the HMI vector and handle it inside OPAL firmware.
216 * For newer firmware (in development/yet to be released) we will
217 * start catching/handling HMI directly in Linux.
219 if (!opal_check_token(OPAL_HANDLE_HMI)) {
220 pr_info("Old firmware detected, OPAL handles HMIs.\n");
221 opal_register_exception_handler(
222 OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
227 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
232 machine_early_initcall(powernv, opal_register_exception_handlers);
235 * Opal message notifier based on message type. Allow subscribers to get
236 * notified for specific messgae type.
238 int opal_message_notifier_register(enum opal_msg_type msg_type,
239 struct notifier_block *nb)
241 if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) {
242 pr_warn("%s: Invalid arguments, msg_type:%d\n",
247 return atomic_notifier_chain_register(
248 &opal_msg_notifier_head[msg_type], nb);
250 EXPORT_SYMBOL_GPL(opal_message_notifier_register);
252 int opal_message_notifier_unregister(enum opal_msg_type msg_type,
253 struct notifier_block *nb)
255 return atomic_notifier_chain_unregister(
256 &opal_msg_notifier_head[msg_type], nb);
258 EXPORT_SYMBOL_GPL(opal_message_notifier_unregister);
260 static void opal_message_do_notify(uint32_t msg_type, void *msg)
262 /* notify subscribers */
263 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type],
267 static void opal_handle_message(void)
271 * TODO: pre-allocate a message buffer depending on opal-msg-size
272 * value in /proc/device-tree.
274 static struct opal_msg msg;
277 ret = opal_get_msg(__pa(&msg), sizeof(msg));
278 /* No opal message pending. */
279 if (ret == OPAL_RESOURCE)
282 /* check for errors. */
284 pr_warn("%s: Failed to retrieve opal message, err=%lld\n",
289 type = be32_to_cpu(msg.msg_type);
292 if (type >= OPAL_MSG_TYPE_MAX) {
293 pr_warn_once("%s: Unknown message type: %u\n", __func__, type);
296 opal_message_do_notify(type, (void *)&msg);
299 static irqreturn_t opal_message_notify(int irq, void *data)
301 opal_handle_message();
305 static int __init opal_message_init(void)
309 for (i = 0; i < OPAL_MSG_TYPE_MAX; i++)
310 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]);
312 irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING));
314 pr_err("%s: Can't register OPAL event irq (%d)\n",
319 ret = request_irq(irq, opal_message_notify,
320 IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL);
322 pr_err("%s: Can't request OPAL event irq (%d)\n",
330 int opal_get_chars(uint32_t vtermno, char *buf, int count)
337 opal_poll_events(&evt);
338 if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0)
340 len = cpu_to_be64(count);
341 rc = opal_console_read(vtermno, &len, buf);
342 if (rc == OPAL_SUCCESS)
343 return be64_to_cpu(len);
347 static int __opal_put_chars(uint32_t vtermno, const char *data, int total_len, bool atomic)
349 unsigned long flags = 0 /* shut up gcc */;
358 spin_lock_irqsave(&opal_write_lock, flags);
359 rc = opal_console_write_buffer_space(vtermno, &olen);
360 if (rc || be64_to_cpu(olen) < total_len) {
361 /* Closed -> drop characters */
369 /* Should not get a partial write here because space is available. */
370 olen = cpu_to_be64(total_len);
371 rc = opal_console_write(vtermno, &olen, data);
372 if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
373 if (rc == OPAL_BUSY_EVENT)
374 opal_poll_events(NULL);
379 /* Closed or other error drop */
380 if (rc != OPAL_SUCCESS) {
381 written = opal_error_code(rc);
385 written = be64_to_cpu(olen);
386 if (written < total_len) {
388 /* Should not happen */
389 pr_warn("atomic console write returned partial "
390 "len=%d written=%d\n", total_len, written);
398 spin_unlock_irqrestore(&opal_write_lock, flags);
403 int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
405 return __opal_put_chars(vtermno, data, total_len, false);
409 * opal_put_chars_atomic will not perform partial-writes. Data will be
410 * atomically written to the terminal or not at all. This is not strictly
411 * true at the moment because console space can race with OPAL's console
414 int opal_put_chars_atomic(uint32_t vtermno, const char *data, int total_len)
416 return __opal_put_chars(vtermno, data, total_len, true);
419 static s64 __opal_flush_console(uint32_t vtermno)
423 if (!opal_check_token(OPAL_CONSOLE_FLUSH)) {
427 * If OPAL_CONSOLE_FLUSH is not implemented in the firmware,
428 * the console can still be flushed by calling the polling
429 * function while it has OPAL_EVENT_CONSOLE_OUTPUT events.
431 WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n");
433 opal_poll_events(&evt);
434 if (!(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT))
439 rc = opal_console_flush(vtermno);
440 if (rc == OPAL_BUSY_EVENT) {
441 opal_poll_events(NULL);
450 * opal_flush_console spins until the console is flushed
452 int opal_flush_console(uint32_t vtermno)
455 s64 rc = __opal_flush_console(vtermno);
457 if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) {
462 return opal_error_code(rc);
467 * opal_flush_chars is an hvc interface that sleeps until the console is
468 * flushed if wait, otherwise it will return -EBUSY if the console has data,
469 * -EAGAIN if it has data and some of it was flushed.
471 int opal_flush_chars(uint32_t vtermno, bool wait)
474 s64 rc = __opal_flush_console(vtermno);
476 if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) {
478 msleep(OPAL_BUSY_DELAY_MS);
481 if (rc == OPAL_PARTIAL)
485 return opal_error_code(rc);
489 static int opal_recover_mce(struct pt_regs *regs,
490 struct machine_check_event *evt)
494 if (!(regs->msr & MSR_RI)) {
495 /* If MSR_RI isn't set, we cannot recover */
496 pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n");
498 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) {
499 /* Platform corrected itself */
501 } else if (evt->severity == MCE_SEV_FATAL) {
502 /* Fatal machine check */
503 pr_err("Machine check interrupt is fatal\n");
507 if (!recovered && evt->severity == MCE_SEV_ERROR_SYNC) {
509 * Try to kill processes if we get a synchronous machine check
510 * (e.g., one caused by execution of this instruction). This
511 * will devolve into a panic if we try to kill init or are in
514 * TODO: Queue up this address for hwpoisioning later.
515 * TODO: This is not quite right for d-side machine
516 * checks ->nip is not necessarily the important
519 if ((user_mode(regs))) {
520 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
522 } else if (die_will_crash()) {
524 * die() would kill the kernel, so better to go via
525 * the platform reboot code that will log the
530 die("Machine check", regs, SIGBUS);
538 void pnv_platform_error_reboot(struct pt_regs *regs, const char *msg)
540 panic_flush_kmsg_start();
542 pr_emerg("Hardware platform error: %s\n", msg);
547 panic_flush_kmsg_end();
550 * Don't bother to shut things down because this will
553 if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg)
554 == OPAL_UNSUPPORTED) {
555 pr_emerg("Reboot type %d not supported for %s\n",
556 OPAL_REBOOT_PLATFORM_ERROR, msg);
560 * We reached here. There can be three possibilities:
561 * 1. We are running on a firmware level that do not support
563 * 2. We are running on a firmware level that do not support
564 * OPAL_REBOOT_PLATFORM_ERROR reboot type.
565 * 3. We are running on FSP based system that does not need
566 * opal to trigger checkstop explicitly for error analysis.
567 * The FSP PRD component would have already got notified
568 * about this error through other channels.
569 * 4. We are running on a newer skiboot that by default does
570 * not cause a checkstop, drops us back to the kernel to
571 * extract context and state at the time of the error.
577 int opal_machine_check(struct pt_regs *regs)
579 struct machine_check_event evt;
581 if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
584 /* Print things out */
585 if (evt.version != MCE_V1) {
586 pr_err("Machine Check Exception, Unknown event version %d !\n",
590 machine_check_print_event_info(&evt, user_mode(regs));
592 if (opal_recover_mce(regs, &evt))
595 pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception");
598 /* Early hmi handler called in real mode. */
599 int opal_hmi_exception_early(struct pt_regs *regs)
604 * call opal hmi handler. Pass paca address as token.
605 * The return value OPAL_SUCCESS is an indication that there is
606 * an HMI event generated waiting to pull by Linux.
608 rc = opal_handle_hmi();
609 if (rc == OPAL_SUCCESS) {
610 local_paca->hmi_event_available = 1;
616 /* HMI exception handler called in virtual mode during check_irq_replay. */
617 int opal_handle_hmi_exception(struct pt_regs *regs)
620 * Check if HMI event is available.
621 * if Yes, then wake kopald to process them.
623 if (!local_paca->hmi_event_available)
626 local_paca->hmi_event_available = 0;
632 static uint64_t find_recovery_address(uint64_t nip)
636 for (i = 0; i < mc_recoverable_range_len; i++)
637 if ((nip >= mc_recoverable_range[i].start_addr) &&
638 (nip < mc_recoverable_range[i].end_addr))
639 return mc_recoverable_range[i].recover_addr;
643 bool opal_mce_check_early_recovery(struct pt_regs *regs)
645 uint64_t recover_addr = 0;
647 if (!opal.base || !opal.size)
650 if ((regs->nip >= opal.base) &&
651 (regs->nip < (opal.base + opal.size)))
652 recover_addr = find_recovery_address(regs->nip);
655 * Setup regs->nip to rfi into fixup address.
658 regs->nip = recover_addr;
661 return !!recover_addr;
664 static int opal_sysfs_init(void)
666 opal_kobj = kobject_create_and_add("opal", firmware_kobj);
668 pr_warn("kobject_create_and_add opal failed\n");
675 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj,
676 struct bin_attribute *bin_attr,
677 char *buf, loff_t off, size_t count)
679 return memory_read_from_buffer(buf, count, &off, bin_attr->private,
683 static struct bin_attribute symbol_map_attr = {
684 .attr = {.name = "symbol_map", .mode = 0400},
685 .read = symbol_map_read
688 static void opal_export_symmap(void)
692 struct device_node *fw;
695 fw = of_find_node_by_path("/ibm,opal/firmware");
698 syms = of_get_property(fw, "symbol-map", &size);
699 if (!syms || size != 2 * sizeof(__be64))
702 /* Setup attributes */
703 symbol_map_attr.private = __va(be64_to_cpu(syms[0]));
704 symbol_map_attr.size = be64_to_cpu(syms[1]);
706 rc = sysfs_create_bin_file(opal_kobj, &symbol_map_attr);
708 pr_warn("Error %d creating OPAL symbols file\n", rc);
711 static ssize_t export_attr_read(struct file *fp, struct kobject *kobj,
712 struct bin_attribute *bin_attr, char *buf,
713 loff_t off, size_t count)
715 return memory_read_from_buffer(buf, count, &off, bin_attr->private,
720 * opal_export_attrs: creates a sysfs node for each property listed in
721 * the device-tree under /ibm,opal/firmware/exports/
722 * All new sysfs nodes are created under /opal/exports/.
723 * This allows for reserved memory regions (e.g. HDAT) to be read.
724 * The new sysfs nodes are only readable by root.
726 static void opal_export_attrs(void)
728 struct bin_attribute *attr;
729 struct device_node *np;
730 struct property *prop;
731 struct kobject *kobj;
735 np = of_find_node_by_path("/ibm,opal/firmware/exports");
739 /* Create new 'exports' directory - /sys/firmware/opal/exports */
740 kobj = kobject_create_and_add("exports", opal_kobj);
742 pr_warn("kobject_create_and_add() of exports failed\n");
746 for_each_property_of_node(np, prop) {
747 if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle"))
750 if (of_property_read_u64_array(np, prop->name, &vals[0], 2))
753 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
756 pr_warn("Failed kmalloc for bin_attribute!");
760 sysfs_bin_attr_init(attr);
761 attr->attr.name = kstrdup(prop->name, GFP_KERNEL);
762 attr->attr.mode = 0400;
763 attr->read = export_attr_read;
764 attr->private = __va(vals[0]);
765 attr->size = vals[1];
767 if (attr->attr.name == NULL) {
768 pr_warn("Failed kstrdup for bin_attribute attr.name");
773 rc = sysfs_create_bin_file(kobj, attr);
775 pr_warn("Error %d creating OPAL sysfs exports/%s file\n",
777 kfree(attr->attr.name);
785 static void __init opal_dump_region_init(void)
791 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION))
794 /* Register kernel log buffer */
795 addr = log_buf_addr_get();
799 size = log_buf_len_get();
803 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
805 /* Don't warn if this is just an older OPAL that doesn't
806 * know about that call
808 if (rc && rc != OPAL_UNSUPPORTED)
809 pr_warn("DUMP: Failed to register kernel log buffer. "
813 static void opal_pdev_init(const char *compatible)
815 struct device_node *np;
817 for_each_compatible_node(np, NULL, compatible)
818 of_platform_device_create(np, NULL, NULL);
821 static void __init opal_imc_init_dev(void)
823 struct device_node *np;
825 np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT);
827 of_platform_device_create(np, NULL, NULL);
830 static int kopald(void *unused)
832 unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1;
838 opal_handle_events();
840 set_current_state(TASK_INTERRUPTIBLE);
841 if (opal_have_pending_events())
842 __set_current_state(TASK_RUNNING);
844 schedule_timeout(timeout);
846 } while (!kthread_should_stop());
851 void opal_wake_poller(void)
854 wake_up_process(kopald_tsk);
857 static void opal_init_heartbeat(void)
859 /* Old firwmware, we assume the HVC heartbeat is sufficient */
860 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms",
861 &opal_heartbeat) != 0)
865 kopald_tsk = kthread_run(kopald, NULL, "kopald");
868 static int __init opal_init(void)
870 struct device_node *np, *consoles, *leds;
873 opal_node = of_find_node_by_path("/ibm,opal");
875 pr_warn("Device node not found\n");
879 /* Register OPAL consoles if any ports */
880 consoles = of_find_node_by_path("/ibm,opal/consoles");
882 for_each_child_of_node(consoles, np) {
883 if (strcmp(np->name, "serial"))
885 of_platform_device_create(np, NULL, NULL);
887 of_node_put(consoles);
890 /* Initialise OPAL messaging system */
893 /* Initialise OPAL asynchronous completion interface */
894 opal_async_comp_init();
896 /* Initialise OPAL sensor interface */
899 /* Initialise OPAL hypervisor maintainence interrupt handling */
900 opal_hmi_handler_init();
902 /* Create i2c platform devices */
903 opal_pdev_init("ibm,opal-i2c");
905 /* Handle non-volatile memory devices */
906 opal_pdev_init("pmem-region");
908 /* Setup a heatbeat thread if requested by OPAL */
909 opal_init_heartbeat();
911 /* Detect In-Memory Collection counters and create devices*/
914 /* Create leds platform devices */
915 leds = of_find_node_by_path("/ibm,opal/leds");
917 of_platform_device_create(leds, "opal_leds", NULL);
921 /* Initialise OPAL message log interface */
924 /* Create "opal" kobject under /sys/firmware */
925 rc = opal_sysfs_init();
927 /* Export symbol map to userspace */
928 opal_export_symmap();
929 /* Setup dump region interface */
930 opal_dump_region_init();
931 /* Setup error log interface */
932 rc = opal_elog_init();
933 /* Setup code update interface */
934 opal_flash_update_init();
935 /* Setup platform dump extract interface */
936 opal_platform_dump_init();
937 /* Setup system parameters interface */
938 opal_sys_param_init();
939 /* Setup message log sysfs interface. */
940 opal_msglog_sysfs_init();
943 /* Export all properties */
946 /* Initialize platform devices: IPMI backend, PRD & flash interface */
947 opal_pdev_init("ibm,opal-ipmi");
948 opal_pdev_init("ibm,opal-flash");
949 opal_pdev_init("ibm,opal-prd");
951 /* Initialise platform device: oppanel interface */
952 opal_pdev_init("ibm,opal-oppanel");
954 /* Initialise OPAL kmsg dumper for flushing console on panic */
957 /* Initialise OPAL powercap interface */
958 opal_powercap_init();
960 /* Initialise OPAL Power-Shifting-Ratio interface */
963 /* Initialise OPAL sensor groups */
964 opal_sensor_groups_init();
968 machine_subsys_initcall(powernv, opal_init);
970 void opal_shutdown(void)
974 opal_event_shutdown();
977 * Then sync with OPAL which ensure anything that can
978 * potentially write to our memory has completed such
979 * as an ongoing dump retrieval
981 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
982 rc = opal_sync_host_reboot();
984 opal_poll_events(NULL);
989 /* Unregister memory dump region */
990 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION))
991 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
994 /* Export this so that test modules can use it */
995 EXPORT_SYMBOL_GPL(opal_invalid_call);
996 EXPORT_SYMBOL_GPL(opal_xscom_read);
997 EXPORT_SYMBOL_GPL(opal_xscom_write);
998 EXPORT_SYMBOL_GPL(opal_ipmi_send);
999 EXPORT_SYMBOL_GPL(opal_ipmi_recv);
1000 EXPORT_SYMBOL_GPL(opal_flash_read);
1001 EXPORT_SYMBOL_GPL(opal_flash_write);
1002 EXPORT_SYMBOL_GPL(opal_flash_erase);
1003 EXPORT_SYMBOL_GPL(opal_prd_msg);
1004 EXPORT_SYMBOL_GPL(opal_check_token);
1006 /* Convert a region of vmalloc memory to an opal sg list */
1007 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
1008 unsigned long vmalloc_size)
1010 struct opal_sg_list *sg, *first = NULL;
1011 unsigned long i = 0;
1013 sg = kzalloc(PAGE_SIZE, GFP_KERNEL);
1019 while (vmalloc_size > 0) {
1020 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT;
1021 uint64_t length = min(vmalloc_size, PAGE_SIZE);
1023 sg->entry[i].data = cpu_to_be64(data);
1024 sg->entry[i].length = cpu_to_be64(length);
1027 if (i >= SG_ENTRIES_PER_NODE) {
1028 struct opal_sg_list *next;
1030 next = kzalloc(PAGE_SIZE, GFP_KERNEL);
1034 sg->length = cpu_to_be64(
1035 i * sizeof(struct opal_sg_entry) + 16);
1037 sg->next = cpu_to_be64(__pa(next));
1041 vmalloc_addr += length;
1042 vmalloc_size -= length;
1045 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16);
1050 pr_err("%s : Failed to allocate memory\n", __func__);
1051 opal_free_sg_list(first);
1055 void opal_free_sg_list(struct opal_sg_list *sg)
1058 uint64_t next = be64_to_cpu(sg->next);
1069 int opal_error_code(int rc)
1072 case OPAL_SUCCESS: return 0;
1074 case OPAL_PARAMETER: return -EINVAL;
1075 case OPAL_ASYNC_COMPLETION: return -EINPROGRESS;
1077 case OPAL_BUSY_EVENT: return -EBUSY;
1078 case OPAL_NO_MEM: return -ENOMEM;
1079 case OPAL_PERMISSION: return -EPERM;
1081 case OPAL_UNSUPPORTED: return -EIO;
1082 case OPAL_HARDWARE: return -EIO;
1083 case OPAL_INTERNAL_ERROR: return -EIO;
1084 case OPAL_TIMEOUT: return -ETIMEDOUT;
1086 pr_err("%s: unexpected OPAL error %d\n", __func__, rc);
1091 void powernv_set_nmmu_ptcr(unsigned long ptcr)
1095 if (firmware_has_feature(FW_FEATURE_OPAL)) {
1096 rc = opal_nmmu_set_ptcr(-1UL, ptcr);
1097 if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED)
1098 pr_warn("%s: Unable to set nest mmu ptcr\n", __func__);
1102 EXPORT_SYMBOL_GPL(opal_poll_events);
1103 EXPORT_SYMBOL_GPL(opal_rtc_read);
1104 EXPORT_SYMBOL_GPL(opal_rtc_write);
1105 EXPORT_SYMBOL_GPL(opal_tpo_read);
1106 EXPORT_SYMBOL_GPL(opal_tpo_write);
1107 EXPORT_SYMBOL_GPL(opal_i2c_request);
1108 /* Export these symbols for PowerNV LED class driver */
1109 EXPORT_SYMBOL_GPL(opal_leds_get_ind);
1110 EXPORT_SYMBOL_GPL(opal_leds_set_ind);
1111 /* Export this symbol for PowerNV Operator Panel class driver */
1112 EXPORT_SYMBOL_GPL(opal_write_oppanel_async);
1113 /* Export this for KVM */
1114 EXPORT_SYMBOL_GPL(opal_int_set_mfrr);
1115 EXPORT_SYMBOL_GPL(opal_int_eoi);
1116 EXPORT_SYMBOL_GPL(opal_error_code);
1117 /* Export the below symbol for NX compression */
1118 EXPORT_SYMBOL(opal_nx_coproc_init);