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/interrupt.h>
20 #include <linux/notifier.h>
21 #include <linux/slab.h>
22 #include <linux/sched.h>
23 #include <linux/kobject.h>
24 #include <linux/delay.h>
25 #include <linux/memblock.h>
26 #include <linux/kthread.h>
27 #include <linux/freezer.h>
29 #include <asm/machdep.h>
31 #include <asm/firmware.h>
36 /* /sys/firmware/opal */
37 struct kobject *opal_kobj;
45 struct mcheck_recoverable_range {
51 static struct mcheck_recoverable_range *mc_recoverable_range;
52 static int mc_recoverable_range_len;
54 struct device_node *opal_node;
55 static DEFINE_SPINLOCK(opal_write_lock);
56 static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
57 static uint32_t opal_heartbeat;
58 static struct task_struct *kopald_tsk;
60 void opal_configure_cores(void)
64 /* Do the actual re-init, This will clobber all FPRs, VRs, etc...
66 * It will preserve non volatile GPRs and HSPRG0/1. It will
67 * also restore HIDs and other SPRs to their original value
68 * but it might clobber a bunch.
71 reinit_flags |= OPAL_REINIT_CPUS_HILE_BE;
73 reinit_flags |= OPAL_REINIT_CPUS_HILE_LE;
77 * POWER9 always support running hash:
78 * ie. Host hash supports hash guests
79 * Host radix supports hash/radix guests
81 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
82 reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH;
83 if (early_radix_enabled())
84 reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX;
87 opal_reinit_cpus(reinit_flags);
89 /* Restore some bits */
90 if (cur_cpu_spec->cpu_restore)
91 cur_cpu_spec->cpu_restore();
94 int __init early_init_dt_scan_opal(unsigned long node,
95 const char *uname, int depth, void *data)
97 const void *basep, *entryp, *sizep;
98 int basesz, entrysz, runtimesz;
100 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
103 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
104 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
105 sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz);
107 if (!basep || !entryp || !sizep)
110 opal.base = of_read_number(basep, basesz/4);
111 opal.entry = of_read_number(entryp, entrysz/4);
112 opal.size = of_read_number(sizep, runtimesz/4);
114 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n",
115 opal.base, basep, basesz);
116 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n",
117 opal.entry, entryp, entrysz);
118 pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n",
119 opal.size, sizep, runtimesz);
121 if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
122 powerpc_firmware_features |= FW_FEATURE_OPAL;
123 pr_info("OPAL detected !\n");
125 panic("OPAL != V3 detected, no longer supported.\n");
131 int __init early_init_dt_scan_recoverable_ranges(unsigned long node,
132 const char *uname, int depth, void *data)
137 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
140 prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize);
145 pr_debug("Found machine check recoverable ranges.\n");
148 * Calculate number of available entries.
150 * Each recoverable address range entry is (start address, len,
151 * recovery address), 2 cells each for start and recovery address,
152 * 1 cell for len, totalling 5 cells per entry.
154 mc_recoverable_range_len = psize / (sizeof(*prop) * 5);
157 if (!mc_recoverable_range_len)
160 /* Size required to hold all the entries. */
161 size = mc_recoverable_range_len *
162 sizeof(struct mcheck_recoverable_range);
165 * Allocate a buffer to hold the MC recoverable ranges. We would be
166 * accessing them in real mode, hence it needs to be within
169 mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64),
171 memset(mc_recoverable_range, 0, size);
173 for (i = 0; i < mc_recoverable_range_len; i++) {
174 mc_recoverable_range[i].start_addr =
175 of_read_number(prop + (i * 5) + 0, 2);
176 mc_recoverable_range[i].end_addr =
177 mc_recoverable_range[i].start_addr +
178 of_read_number(prop + (i * 5) + 2, 1);
179 mc_recoverable_range[i].recover_addr =
180 of_read_number(prop + (i * 5) + 3, 2);
182 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n",
183 mc_recoverable_range[i].start_addr,
184 mc_recoverable_range[i].end_addr,
185 mc_recoverable_range[i].recover_addr);
190 static int __init opal_register_exception_handlers(void)
192 #ifdef __BIG_ENDIAN__
195 if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
198 /* Hookup some exception handlers except machine check. We use the
199 * fwnmi area at 0x7000 to provide the glue space to OPAL
204 * Check if we are running on newer firmware that exports
205 * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch
206 * the HMI interrupt and we catch it directly in Linux.
208 * For older firmware (i.e currently released POWER8 System Firmware
209 * as of today <= SV810_087), we fallback to old behavior and let OPAL
210 * patch the HMI vector and handle it inside OPAL firmware.
212 * For newer firmware (in development/yet to be released) we will
213 * start catching/handling HMI directly in Linux.
215 if (!opal_check_token(OPAL_HANDLE_HMI)) {
216 pr_info("Old firmware detected, OPAL handles HMIs.\n");
217 opal_register_exception_handler(
218 OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
223 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
228 machine_early_initcall(powernv, opal_register_exception_handlers);
231 * Opal message notifier based on message type. Allow subscribers to get
232 * notified for specific messgae type.
234 int opal_message_notifier_register(enum opal_msg_type msg_type,
235 struct notifier_block *nb)
237 if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) {
238 pr_warning("%s: Invalid arguments, msg_type:%d\n",
243 return atomic_notifier_chain_register(
244 &opal_msg_notifier_head[msg_type], nb);
246 EXPORT_SYMBOL_GPL(opal_message_notifier_register);
248 int opal_message_notifier_unregister(enum opal_msg_type msg_type,
249 struct notifier_block *nb)
251 return atomic_notifier_chain_unregister(
252 &opal_msg_notifier_head[msg_type], nb);
254 EXPORT_SYMBOL_GPL(opal_message_notifier_unregister);
256 static void opal_message_do_notify(uint32_t msg_type, void *msg)
258 /* notify subscribers */
259 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type],
263 static void opal_handle_message(void)
267 * TODO: pre-allocate a message buffer depending on opal-msg-size
268 * value in /proc/device-tree.
270 static struct opal_msg msg;
273 ret = opal_get_msg(__pa(&msg), sizeof(msg));
274 /* No opal message pending. */
275 if (ret == OPAL_RESOURCE)
278 /* check for errors. */
280 pr_warning("%s: Failed to retrieve opal message, err=%lld\n",
285 type = be32_to_cpu(msg.msg_type);
288 if (type >= OPAL_MSG_TYPE_MAX) {
289 pr_warn_once("%s: Unknown message type: %u\n", __func__, type);
292 opal_message_do_notify(type, (void *)&msg);
295 static irqreturn_t opal_message_notify(int irq, void *data)
297 opal_handle_message();
301 static int __init opal_message_init(void)
305 for (i = 0; i < OPAL_MSG_TYPE_MAX; i++)
306 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]);
308 irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING));
310 pr_err("%s: Can't register OPAL event irq (%d)\n",
315 ret = request_irq(irq, opal_message_notify,
316 IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL);
318 pr_err("%s: Can't request OPAL event irq (%d)\n",
326 int opal_get_chars(uint32_t vtermno, char *buf, int count)
333 opal_poll_events(&evt);
334 if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0)
336 len = cpu_to_be64(count);
337 rc = opal_console_read(vtermno, &len, buf);
338 if (rc == OPAL_SUCCESS)
339 return be64_to_cpu(len);
343 int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
354 /* We want put_chars to be atomic to avoid mangling of hvsi
355 * packets. To do that, we first test for room and return
356 * -EAGAIN if there isn't enough.
358 * Unfortunately, opal_console_write_buffer_space() doesn't
359 * appear to work on opal v1, so we just assume there is
360 * enough room and be done with it
362 spin_lock_irqsave(&opal_write_lock, flags);
363 rc = opal_console_write_buffer_space(vtermno, &olen);
364 len = be64_to_cpu(olen);
365 if (rc || len < total_len) {
366 spin_unlock_irqrestore(&opal_write_lock, flags);
367 /* Closed -> drop characters */
370 opal_poll_events(NULL);
374 /* We still try to handle partial completions, though they
375 * should no longer happen.
378 while(total_len > 0 && (rc == OPAL_BUSY ||
379 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
380 olen = cpu_to_be64(total_len);
381 rc = opal_console_write(vtermno, &olen, data);
382 len = be64_to_cpu(olen);
384 /* Closed or other error drop */
385 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
386 rc != OPAL_BUSY_EVENT) {
390 if (rc == OPAL_SUCCESS) {
395 /* This is a bit nasty but we need that for the console to
396 * flush when there aren't any interrupts. We will clean
397 * things a bit later to limit that to synchronous path
398 * such as the kernel console and xmon/udbg
401 opal_poll_events(&evt);
402 while(rc == OPAL_SUCCESS &&
403 (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT));
405 spin_unlock_irqrestore(&opal_write_lock, flags);
409 static int opal_recover_mce(struct pt_regs *regs,
410 struct machine_check_event *evt)
414 if (!(regs->msr & MSR_RI)) {
415 /* If MSR_RI isn't set, we cannot recover */
416 pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n");
418 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) {
419 /* Platform corrected itself */
421 } else if (evt->severity == MCE_SEV_FATAL) {
422 /* Fatal machine check */
423 pr_err("Machine check interrupt is fatal\n");
425 } else if ((evt->severity == MCE_SEV_ERROR_SYNC) &&
426 (user_mode(regs) && !is_global_init(current))) {
428 * For now, kill the task if we have received exception when
431 * TODO: Queue up this address for hwpoisioning later.
433 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
439 int opal_machine_check(struct pt_regs *regs)
441 struct machine_check_event evt;
444 if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
447 /* Print things out */
448 if (evt.version != MCE_V1) {
449 pr_err("Machine Check Exception, Unknown event version %d !\n",
453 machine_check_print_event_info(&evt, user_mode(regs));
455 if (opal_recover_mce(regs, &evt))
459 * Unrecovered machine check, we are heading to panic path.
461 * We may have hit this MCE in very early stage of kernel
462 * initialization even before opal-prd has started running. If
463 * this is the case then this MCE error may go un-noticed or
464 * un-analyzed if we go down panic path. We need to inform
465 * BMC/OCC about this error so that they can collect relevant
466 * data for error analysis before rebooting.
467 * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so.
468 * This function may not return on BMC based system.
470 ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR,
471 "Unrecoverable Machine Check exception");
472 if (ret == OPAL_UNSUPPORTED) {
473 pr_emerg("Reboot type %d not supported\n",
474 OPAL_REBOOT_PLATFORM_ERROR);
478 * We reached here. There can be three possibilities:
479 * 1. We are running on a firmware level that do not support
481 * 2. We are running on a firmware level that do not support
482 * OPAL_REBOOT_PLATFORM_ERROR reboot type.
483 * 3. We are running on FSP based system that does not need opal
484 * to trigger checkstop explicitly for error analysis. The FSP
485 * PRD component would have already got notified about this
486 * error through other channels.
488 * If hardware marked this as an unrecoverable MCE, we are
489 * going to panic anyway. Even if it didn't, it's not safe to
490 * continue at this point, so we should explicitly panic.
493 panic("PowerNV Unrecovered Machine Check");
497 /* Early hmi handler called in real mode. */
498 int opal_hmi_exception_early(struct pt_regs *regs)
503 * call opal hmi handler. Pass paca address as token.
504 * The return value OPAL_SUCCESS is an indication that there is
505 * an HMI event generated waiting to pull by Linux.
507 rc = opal_handle_hmi();
508 if (rc == OPAL_SUCCESS) {
509 local_paca->hmi_event_available = 1;
515 /* HMI exception handler called in virtual mode during check_irq_replay. */
516 int opal_handle_hmi_exception(struct pt_regs *regs)
522 * Check if HMI event is available.
523 * if Yes, then call opal_poll_events to pull opal messages and
526 if (!local_paca->hmi_event_available)
529 local_paca->hmi_event_available = 0;
530 rc = opal_poll_events(&evt);
531 if (rc == OPAL_SUCCESS && evt)
532 opal_handle_events(be64_to_cpu(evt));
537 static uint64_t find_recovery_address(uint64_t nip)
541 for (i = 0; i < mc_recoverable_range_len; i++)
542 if ((nip >= mc_recoverable_range[i].start_addr) &&
543 (nip < mc_recoverable_range[i].end_addr))
544 return mc_recoverable_range[i].recover_addr;
548 bool opal_mce_check_early_recovery(struct pt_regs *regs)
550 uint64_t recover_addr = 0;
552 if (!opal.base || !opal.size)
555 if ((regs->nip >= opal.base) &&
556 (regs->nip < (opal.base + opal.size)))
557 recover_addr = find_recovery_address(regs->nip);
560 * Setup regs->nip to rfi into fixup address.
563 regs->nip = recover_addr;
566 return !!recover_addr;
569 static int opal_sysfs_init(void)
571 opal_kobj = kobject_create_and_add("opal", firmware_kobj);
573 pr_warn("kobject_create_and_add opal failed\n");
580 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj,
581 struct bin_attribute *bin_attr,
582 char *buf, loff_t off, size_t count)
584 return memory_read_from_buffer(buf, count, &off, bin_attr->private,
588 static BIN_ATTR_RO(symbol_map, 0);
590 static void opal_export_symmap(void)
594 struct device_node *fw;
597 fw = of_find_node_by_path("/ibm,opal/firmware");
600 syms = of_get_property(fw, "symbol-map", &size);
601 if (!syms || size != 2 * sizeof(__be64))
604 /* Setup attributes */
605 bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0]));
606 bin_attr_symbol_map.size = be64_to_cpu(syms[1]);
608 rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map);
610 pr_warn("Error %d creating OPAL symbols file\n", rc);
613 static ssize_t export_attr_read(struct file *fp, struct kobject *kobj,
614 struct bin_attribute *bin_attr, char *buf,
615 loff_t off, size_t count)
617 return memory_read_from_buffer(buf, count, &off, bin_attr->private,
622 * opal_export_attrs: creates a sysfs node for each property listed in
623 * the device-tree under /ibm,opal/firmware/exports/
624 * All new sysfs nodes are created under /opal/exports/.
625 * This allows for reserved memory regions (e.g. HDAT) to be read.
626 * The new sysfs nodes are only readable by root.
628 static void opal_export_attrs(void)
630 struct bin_attribute *attr;
631 struct device_node *np;
632 struct property *prop;
633 struct kobject *kobj;
637 np = of_find_node_by_path("/ibm,opal/firmware/exports");
641 /* Create new 'exports' directory - /sys/firmware/opal/exports */
642 kobj = kobject_create_and_add("exports", opal_kobj);
644 pr_warn("kobject_create_and_add() of exports failed\n");
648 for_each_property_of_node(np, prop) {
649 if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle"))
652 if (of_property_read_u64_array(np, prop->name, &vals[0], 2))
655 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
658 pr_warn("Failed kmalloc for bin_attribute!");
662 sysfs_bin_attr_init(attr);
663 attr->attr.name = kstrdup(prop->name, GFP_KERNEL);
664 attr->attr.mode = 0400;
665 attr->read = export_attr_read;
666 attr->private = __va(vals[0]);
667 attr->size = vals[1];
669 if (attr->attr.name == NULL) {
670 pr_warn("Failed kstrdup for bin_attribute attr.name");
675 rc = sysfs_create_bin_file(kobj, attr);
677 pr_warn("Error %d creating OPAL sysfs exports/%s file\n",
679 kfree(attr->attr.name);
687 static void __init opal_dump_region_init(void)
693 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION))
696 /* Register kernel log buffer */
697 addr = log_buf_addr_get();
701 size = log_buf_len_get();
705 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
707 /* Don't warn if this is just an older OPAL that doesn't
708 * know about that call
710 if (rc && rc != OPAL_UNSUPPORTED)
711 pr_warn("DUMP: Failed to register kernel log buffer. "
715 static void opal_pdev_init(const char *compatible)
717 struct device_node *np;
719 for_each_compatible_node(np, NULL, compatible)
720 of_platform_device_create(np, NULL, NULL);
723 static int kopald(void *unused)
725 unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1;
731 opal_poll_events(&events);
732 opal_handle_events(be64_to_cpu(events));
733 schedule_timeout_interruptible(timeout);
734 } while (!kthread_should_stop());
739 void opal_wake_poller(void)
742 wake_up_process(kopald_tsk);
745 static void opal_init_heartbeat(void)
747 /* Old firwmware, we assume the HVC heartbeat is sufficient */
748 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms",
749 &opal_heartbeat) != 0)
753 kopald_tsk = kthread_run(kopald, NULL, "kopald");
756 static int __init opal_init(void)
758 struct device_node *np, *consoles, *leds;
761 opal_node = of_find_node_by_path("/ibm,opal");
763 pr_warn("Device node not found\n");
767 /* Register OPAL consoles if any ports */
768 consoles = of_find_node_by_path("/ibm,opal/consoles");
770 for_each_child_of_node(consoles, np) {
771 if (strcmp(np->name, "serial"))
773 of_platform_device_create(np, NULL, NULL);
775 of_node_put(consoles);
778 /* Initialise OPAL messaging system */
781 /* Initialise OPAL asynchronous completion interface */
782 opal_async_comp_init();
784 /* Initialise OPAL sensor interface */
787 /* Initialise OPAL hypervisor maintainence interrupt handling */
788 opal_hmi_handler_init();
790 /* Create i2c platform devices */
791 opal_pdev_init("ibm,opal-i2c");
793 /* Setup a heatbeat thread if requested by OPAL */
794 opal_init_heartbeat();
796 /* Create leds platform devices */
797 leds = of_find_node_by_path("/ibm,opal/leds");
799 of_platform_device_create(leds, "opal_leds", NULL);
803 /* Initialise OPAL message log interface */
806 /* Create "opal" kobject under /sys/firmware */
807 rc = opal_sysfs_init();
809 /* Export symbol map to userspace */
810 opal_export_symmap();
811 /* Setup dump region interface */
812 opal_dump_region_init();
813 /* Setup error log interface */
814 rc = opal_elog_init();
815 /* Setup code update interface */
816 opal_flash_update_init();
817 /* Setup platform dump extract interface */
818 opal_platform_dump_init();
819 /* Setup system parameters interface */
820 opal_sys_param_init();
821 /* Setup message log sysfs interface. */
822 opal_msglog_sysfs_init();
825 /* Export all properties */
828 /* Initialize platform devices: IPMI backend, PRD & flash interface */
829 opal_pdev_init("ibm,opal-ipmi");
830 opal_pdev_init("ibm,opal-flash");
831 opal_pdev_init("ibm,opal-prd");
833 /* Initialise platform device: oppanel interface */
834 opal_pdev_init("ibm,opal-oppanel");
836 /* Initialise OPAL kmsg dumper for flushing console on panic */
841 machine_subsys_initcall(powernv, opal_init);
843 void opal_shutdown(void)
847 opal_event_shutdown();
850 * Then sync with OPAL which ensure anything that can
851 * potentially write to our memory has completed such
852 * as an ongoing dump retrieval
854 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
855 rc = opal_sync_host_reboot();
857 opal_poll_events(NULL);
862 /* Unregister memory dump region */
863 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION))
864 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
867 /* Export this so that test modules can use it */
868 EXPORT_SYMBOL_GPL(opal_invalid_call);
869 EXPORT_SYMBOL_GPL(opal_xscom_read);
870 EXPORT_SYMBOL_GPL(opal_xscom_write);
871 EXPORT_SYMBOL_GPL(opal_ipmi_send);
872 EXPORT_SYMBOL_GPL(opal_ipmi_recv);
873 EXPORT_SYMBOL_GPL(opal_flash_read);
874 EXPORT_SYMBOL_GPL(opal_flash_write);
875 EXPORT_SYMBOL_GPL(opal_flash_erase);
876 EXPORT_SYMBOL_GPL(opal_prd_msg);
878 /* Convert a region of vmalloc memory to an opal sg list */
879 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
880 unsigned long vmalloc_size)
882 struct opal_sg_list *sg, *first = NULL;
885 sg = kzalloc(PAGE_SIZE, GFP_KERNEL);
891 while (vmalloc_size > 0) {
892 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT;
893 uint64_t length = min(vmalloc_size, PAGE_SIZE);
895 sg->entry[i].data = cpu_to_be64(data);
896 sg->entry[i].length = cpu_to_be64(length);
899 if (i >= SG_ENTRIES_PER_NODE) {
900 struct opal_sg_list *next;
902 next = kzalloc(PAGE_SIZE, GFP_KERNEL);
906 sg->length = cpu_to_be64(
907 i * sizeof(struct opal_sg_entry) + 16);
909 sg->next = cpu_to_be64(__pa(next));
913 vmalloc_addr += length;
914 vmalloc_size -= length;
917 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16);
922 pr_err("%s : Failed to allocate memory\n", __func__);
923 opal_free_sg_list(first);
927 void opal_free_sg_list(struct opal_sg_list *sg)
930 uint64_t next = be64_to_cpu(sg->next);
941 int opal_error_code(int rc)
944 case OPAL_SUCCESS: return 0;
946 case OPAL_PARAMETER: return -EINVAL;
947 case OPAL_ASYNC_COMPLETION: return -EINPROGRESS;
948 case OPAL_BUSY_EVENT: return -EBUSY;
949 case OPAL_NO_MEM: return -ENOMEM;
950 case OPAL_PERMISSION: return -EPERM;
952 case OPAL_UNSUPPORTED: return -EIO;
953 case OPAL_HARDWARE: return -EIO;
954 case OPAL_INTERNAL_ERROR: return -EIO;
956 pr_err("%s: unexpected OPAL error %d\n", __func__, rc);
961 void powernv_set_nmmu_ptcr(unsigned long ptcr)
965 if (firmware_has_feature(FW_FEATURE_OPAL)) {
966 rc = opal_nmmu_set_ptcr(-1UL, ptcr);
967 if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED)
968 pr_warn("%s: Unable to set nest mmu ptcr\n", __func__);
972 EXPORT_SYMBOL_GPL(opal_poll_events);
973 EXPORT_SYMBOL_GPL(opal_rtc_read);
974 EXPORT_SYMBOL_GPL(opal_rtc_write);
975 EXPORT_SYMBOL_GPL(opal_tpo_read);
976 EXPORT_SYMBOL_GPL(opal_tpo_write);
977 EXPORT_SYMBOL_GPL(opal_i2c_request);
978 /* Export these symbols for PowerNV LED class driver */
979 EXPORT_SYMBOL_GPL(opal_leds_get_ind);
980 EXPORT_SYMBOL_GPL(opal_leds_set_ind);
981 /* Export this symbol for PowerNV Operator Panel class driver */
982 EXPORT_SYMBOL_GPL(opal_write_oppanel_async);
983 /* Export this for KVM */
984 EXPORT_SYMBOL_GPL(opal_int_set_mfrr);
985 EXPORT_SYMBOL_GPL(opal_int_eoi);