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_info("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_warning("%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_warning("%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 int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
358 /* We want put_chars to be atomic to avoid mangling of hvsi
359 * packets. To do that, we first test for room and return
360 * -EAGAIN if there isn't enough.
362 * Unfortunately, opal_console_write_buffer_space() doesn't
363 * appear to work on opal v1, so we just assume there is
364 * enough room and be done with it
366 spin_lock_irqsave(&opal_write_lock, flags);
367 rc = opal_console_write_buffer_space(vtermno, &olen);
368 len = be64_to_cpu(olen);
369 if (rc || len < total_len) {
370 spin_unlock_irqrestore(&opal_write_lock, flags);
371 /* Closed -> drop characters */
374 opal_poll_events(NULL);
378 /* We still try to handle partial completions, though they
379 * should no longer happen.
382 while(total_len > 0 && (rc == OPAL_BUSY ||
383 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
384 olen = cpu_to_be64(total_len);
385 rc = opal_console_write(vtermno, &olen, data);
386 len = be64_to_cpu(olen);
388 /* Closed or other error drop */
389 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
390 rc != OPAL_BUSY_EVENT) {
391 written += total_len;
394 if (rc == OPAL_SUCCESS) {
399 /* This is a bit nasty but we need that for the console to
400 * flush when there aren't any interrupts. We will clean
401 * things a bit later to limit that to synchronous path
402 * such as the kernel console and xmon/udbg
405 opal_poll_events(&evt);
406 while(rc == OPAL_SUCCESS &&
407 (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT));
409 spin_unlock_irqrestore(&opal_write_lock, flags);
413 static int opal_recover_mce(struct pt_regs *regs,
414 struct machine_check_event *evt)
418 if (!(regs->msr & MSR_RI)) {
419 /* If MSR_RI isn't set, we cannot recover */
420 pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n");
422 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) {
423 /* Platform corrected itself */
425 } else if (evt->severity == MCE_SEV_FATAL) {
426 /* Fatal machine check */
427 pr_err("Machine check interrupt is fatal\n");
431 if (!recovered && evt->severity == MCE_SEV_ERROR_SYNC) {
433 * Try to kill processes if we get a synchronous machine check
434 * (e.g., one caused by execution of this instruction). This
435 * will devolve into a panic if we try to kill init or are in
438 * TODO: Queue up this address for hwpoisioning later.
439 * TODO: This is not quite right for d-side machine
440 * checks ->nip is not necessarily the important
443 if ((user_mode(regs))) {
444 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
446 } else if (die_will_crash()) {
448 * die() would kill the kernel, so better to go via
449 * the platform reboot code that will log the
454 die("Machine check", regs, SIGBUS);
462 void pnv_platform_error_reboot(struct pt_regs *regs, const char *msg)
465 * This is mostly taken from kernel/panic.c, but tries to do
466 * relatively minimal work. Don't use delay functions (TB may
467 * be broken), don't crash dump (need to set a firmware log),
468 * don't run notifiers. We do want to get some information to
473 pr_emerg("Hardware platform error: %s\n", msg);
477 printk_safe_flush_on_panic();
478 kmsg_dump(KMSG_DUMP_PANIC);
481 console_flush_on_panic();
484 * Don't bother to shut things down because this will
487 if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg)
488 == OPAL_UNSUPPORTED) {
489 pr_emerg("Reboot type %d not supported for %s\n",
490 OPAL_REBOOT_PLATFORM_ERROR, msg);
494 * We reached here. There can be three possibilities:
495 * 1. We are running on a firmware level that do not support
497 * 2. We are running on a firmware level that do not support
498 * OPAL_REBOOT_PLATFORM_ERROR reboot type.
499 * 3. We are running on FSP based system that does not need
500 * opal to trigger checkstop explicitly for error analysis.
501 * The FSP PRD component would have already got notified
502 * about this error through other channels.
505 ppc_md.restart(NULL);
508 int opal_machine_check(struct pt_regs *regs)
510 struct machine_check_event evt;
512 if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
515 /* Print things out */
516 if (evt.version != MCE_V1) {
517 pr_err("Machine Check Exception, Unknown event version %d !\n",
521 machine_check_print_event_info(&evt, user_mode(regs));
523 if (opal_recover_mce(regs, &evt))
526 pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception");
529 /* Early hmi handler called in real mode. */
530 int opal_hmi_exception_early(struct pt_regs *regs)
535 * call opal hmi handler. Pass paca address as token.
536 * The return value OPAL_SUCCESS is an indication that there is
537 * an HMI event generated waiting to pull by Linux.
539 rc = opal_handle_hmi();
540 if (rc == OPAL_SUCCESS) {
541 local_paca->hmi_event_available = 1;
547 /* HMI exception handler called in virtual mode during check_irq_replay. */
548 int opal_handle_hmi_exception(struct pt_regs *regs)
554 * Check if HMI event is available.
555 * if Yes, then call opal_poll_events to pull opal messages and
558 if (!local_paca->hmi_event_available)
561 local_paca->hmi_event_available = 0;
562 rc = opal_poll_events(&evt);
563 if (rc == OPAL_SUCCESS && evt)
564 opal_handle_events(be64_to_cpu(evt));
569 static uint64_t find_recovery_address(uint64_t nip)
573 for (i = 0; i < mc_recoverable_range_len; i++)
574 if ((nip >= mc_recoverable_range[i].start_addr) &&
575 (nip < mc_recoverable_range[i].end_addr))
576 return mc_recoverable_range[i].recover_addr;
580 bool opal_mce_check_early_recovery(struct pt_regs *regs)
582 uint64_t recover_addr = 0;
584 if (!opal.base || !opal.size)
587 if ((regs->nip >= opal.base) &&
588 (regs->nip < (opal.base + opal.size)))
589 recover_addr = find_recovery_address(regs->nip);
592 * Setup regs->nip to rfi into fixup address.
595 regs->nip = recover_addr;
598 return !!recover_addr;
601 static int opal_sysfs_init(void)
603 opal_kobj = kobject_create_and_add("opal", firmware_kobj);
605 pr_warn("kobject_create_and_add opal failed\n");
612 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj,
613 struct bin_attribute *bin_attr,
614 char *buf, loff_t off, size_t count)
616 return memory_read_from_buffer(buf, count, &off, bin_attr->private,
620 static struct bin_attribute symbol_map_attr = {
621 .attr = {.name = "symbol_map", .mode = 0400},
622 .read = symbol_map_read
625 static void opal_export_symmap(void)
629 struct device_node *fw;
632 fw = of_find_node_by_path("/ibm,opal/firmware");
635 syms = of_get_property(fw, "symbol-map", &size);
636 if (!syms || size != 2 * sizeof(__be64))
639 /* Setup attributes */
640 symbol_map_attr.private = __va(be64_to_cpu(syms[0]));
641 symbol_map_attr.size = be64_to_cpu(syms[1]);
643 rc = sysfs_create_bin_file(opal_kobj, &symbol_map_attr);
645 pr_warn("Error %d creating OPAL symbols file\n", rc);
648 static ssize_t export_attr_read(struct file *fp, struct kobject *kobj,
649 struct bin_attribute *bin_attr, char *buf,
650 loff_t off, size_t count)
652 return memory_read_from_buffer(buf, count, &off, bin_attr->private,
657 * opal_export_attrs: creates a sysfs node for each property listed in
658 * the device-tree under /ibm,opal/firmware/exports/
659 * All new sysfs nodes are created under /opal/exports/.
660 * This allows for reserved memory regions (e.g. HDAT) to be read.
661 * The new sysfs nodes are only readable by root.
663 static void opal_export_attrs(void)
665 struct bin_attribute *attr;
666 struct device_node *np;
667 struct property *prop;
668 struct kobject *kobj;
672 np = of_find_node_by_path("/ibm,opal/firmware/exports");
676 /* Create new 'exports' directory - /sys/firmware/opal/exports */
677 kobj = kobject_create_and_add("exports", opal_kobj);
679 pr_warn("kobject_create_and_add() of exports failed\n");
684 for_each_property_of_node(np, prop) {
685 if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle"))
688 if (of_property_read_u64_array(np, prop->name, &vals[0], 2))
691 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
694 pr_warn("Failed kmalloc for bin_attribute!");
698 sysfs_bin_attr_init(attr);
699 attr->attr.name = kstrdup(prop->name, GFP_KERNEL);
700 attr->attr.mode = 0400;
701 attr->read = export_attr_read;
702 attr->private = __va(vals[0]);
703 attr->size = vals[1];
705 if (attr->attr.name == NULL) {
706 pr_warn("Failed kstrdup for bin_attribute attr.name");
711 rc = sysfs_create_bin_file(kobj, attr);
713 pr_warn("Error %d creating OPAL sysfs exports/%s file\n",
715 kfree(attr->attr.name);
723 static void __init opal_dump_region_init(void)
729 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION))
732 /* Register kernel log buffer */
733 addr = log_buf_addr_get();
737 size = log_buf_len_get();
741 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
743 /* Don't warn if this is just an older OPAL that doesn't
744 * know about that call
746 if (rc && rc != OPAL_UNSUPPORTED)
747 pr_warn("DUMP: Failed to register kernel log buffer. "
751 static void opal_pdev_init(const char *compatible)
753 struct device_node *np;
755 for_each_compatible_node(np, NULL, compatible)
756 of_platform_device_create(np, NULL, NULL);
759 static void __init opal_imc_init_dev(void)
761 struct device_node *np;
763 np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT);
765 of_platform_device_create(np, NULL, NULL);
768 static int kopald(void *unused)
770 unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1;
776 opal_poll_events(&events);
777 opal_handle_events(be64_to_cpu(events));
778 schedule_timeout_interruptible(timeout);
779 } while (!kthread_should_stop());
784 void opal_wake_poller(void)
787 wake_up_process(kopald_tsk);
790 static void opal_init_heartbeat(void)
792 /* Old firwmware, we assume the HVC heartbeat is sufficient */
793 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms",
794 &opal_heartbeat) != 0)
798 kopald_tsk = kthread_run(kopald, NULL, "kopald");
801 static int __init opal_init(void)
803 struct device_node *np, *consoles, *leds;
806 opal_node = of_find_node_by_path("/ibm,opal");
808 pr_warn("Device node not found\n");
812 /* Register OPAL consoles if any ports */
813 consoles = of_find_node_by_path("/ibm,opal/consoles");
815 for_each_child_of_node(consoles, np) {
816 if (strcmp(np->name, "serial"))
818 of_platform_device_create(np, NULL, NULL);
820 of_node_put(consoles);
823 /* Initialise OPAL messaging system */
826 /* Initialise OPAL asynchronous completion interface */
827 opal_async_comp_init();
829 /* Initialise OPAL sensor interface */
832 /* Initialise OPAL hypervisor maintainence interrupt handling */
833 opal_hmi_handler_init();
835 /* Create i2c platform devices */
836 opal_pdev_init("ibm,opal-i2c");
838 /* Setup a heatbeat thread if requested by OPAL */
839 opal_init_heartbeat();
841 /* Detect In-Memory Collection counters and create devices*/
844 /* Create leds platform devices */
845 leds = of_find_node_by_path("/ibm,opal/leds");
847 of_platform_device_create(leds, "opal_leds", NULL);
851 /* Initialise OPAL message log interface */
854 /* Create "opal" kobject under /sys/firmware */
855 rc = opal_sysfs_init();
857 /* Export symbol map to userspace */
858 opal_export_symmap();
859 /* Setup dump region interface */
860 opal_dump_region_init();
861 /* Setup error log interface */
862 rc = opal_elog_init();
863 /* Setup code update interface */
864 opal_flash_update_init();
865 /* Setup platform dump extract interface */
866 opal_platform_dump_init();
867 /* Setup system parameters interface */
868 opal_sys_param_init();
869 /* Setup message log sysfs interface. */
870 opal_msglog_sysfs_init();
873 /* Export all properties */
876 /* Initialize platform devices: IPMI backend, PRD & flash interface */
877 opal_pdev_init("ibm,opal-ipmi");
878 opal_pdev_init("ibm,opal-flash");
879 opal_pdev_init("ibm,opal-prd");
881 /* Initialise platform device: oppanel interface */
882 opal_pdev_init("ibm,opal-oppanel");
884 /* Initialise OPAL kmsg dumper for flushing console on panic */
887 /* Initialise OPAL powercap interface */
888 opal_powercap_init();
890 /* Initialise OPAL Power-Shifting-Ratio interface */
893 /* Initialise OPAL sensor groups */
894 opal_sensor_groups_init();
898 machine_subsys_initcall(powernv, opal_init);
900 void opal_shutdown(void)
904 opal_event_shutdown();
907 * Then sync with OPAL which ensure anything that can
908 * potentially write to our memory has completed such
909 * as an ongoing dump retrieval
911 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
912 rc = opal_sync_host_reboot();
914 opal_poll_events(NULL);
919 /* Unregister memory dump region */
920 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION))
921 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
924 /* Export this so that test modules can use it */
925 EXPORT_SYMBOL_GPL(opal_invalid_call);
926 EXPORT_SYMBOL_GPL(opal_xscom_read);
927 EXPORT_SYMBOL_GPL(opal_xscom_write);
928 EXPORT_SYMBOL_GPL(opal_ipmi_send);
929 EXPORT_SYMBOL_GPL(opal_ipmi_recv);
930 EXPORT_SYMBOL_GPL(opal_flash_read);
931 EXPORT_SYMBOL_GPL(opal_flash_write);
932 EXPORT_SYMBOL_GPL(opal_flash_erase);
933 EXPORT_SYMBOL_GPL(opal_prd_msg);
935 /* Convert a region of vmalloc memory to an opal sg list */
936 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
937 unsigned long vmalloc_size)
939 struct opal_sg_list *sg, *first = NULL;
942 sg = kzalloc(PAGE_SIZE, GFP_KERNEL);
948 while (vmalloc_size > 0) {
949 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT;
950 uint64_t length = min(vmalloc_size, PAGE_SIZE);
952 sg->entry[i].data = cpu_to_be64(data);
953 sg->entry[i].length = cpu_to_be64(length);
956 if (i >= SG_ENTRIES_PER_NODE) {
957 struct opal_sg_list *next;
959 next = kzalloc(PAGE_SIZE, GFP_KERNEL);
963 sg->length = cpu_to_be64(
964 i * sizeof(struct opal_sg_entry) + 16);
966 sg->next = cpu_to_be64(__pa(next));
970 vmalloc_addr += length;
971 vmalloc_size -= length;
974 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16);
979 pr_err("%s : Failed to allocate memory\n", __func__);
980 opal_free_sg_list(first);
984 void opal_free_sg_list(struct opal_sg_list *sg)
987 uint64_t next = be64_to_cpu(sg->next);
998 int opal_error_code(int rc)
1001 case OPAL_SUCCESS: return 0;
1003 case OPAL_PARAMETER: return -EINVAL;
1004 case OPAL_ASYNC_COMPLETION: return -EINPROGRESS;
1005 case OPAL_BUSY_EVENT: return -EBUSY;
1006 case OPAL_NO_MEM: return -ENOMEM;
1007 case OPAL_PERMISSION: return -EPERM;
1009 case OPAL_UNSUPPORTED: return -EIO;
1010 case OPAL_HARDWARE: return -EIO;
1011 case OPAL_INTERNAL_ERROR: return -EIO;
1012 case OPAL_TIMEOUT: return -ETIMEDOUT;
1014 pr_err("%s: unexpected OPAL error %d\n", __func__, rc);
1019 void powernv_set_nmmu_ptcr(unsigned long ptcr)
1023 if (firmware_has_feature(FW_FEATURE_OPAL)) {
1024 rc = opal_nmmu_set_ptcr(-1UL, ptcr);
1025 if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED)
1026 pr_warn("%s: Unable to set nest mmu ptcr\n", __func__);
1030 EXPORT_SYMBOL_GPL(opal_poll_events);
1031 EXPORT_SYMBOL_GPL(opal_rtc_read);
1032 EXPORT_SYMBOL_GPL(opal_rtc_write);
1033 EXPORT_SYMBOL_GPL(opal_tpo_read);
1034 EXPORT_SYMBOL_GPL(opal_tpo_write);
1035 EXPORT_SYMBOL_GPL(opal_i2c_request);
1036 /* Export these symbols for PowerNV LED class driver */
1037 EXPORT_SYMBOL_GPL(opal_leds_get_ind);
1038 EXPORT_SYMBOL_GPL(opal_leds_set_ind);
1039 /* Export this symbol for PowerNV Operator Panel class driver */
1040 EXPORT_SYMBOL_GPL(opal_write_oppanel_async);
1041 /* Export this for KVM */
1042 EXPORT_SYMBOL_GPL(opal_int_set_mfrr);
1043 EXPORT_SYMBOL_GPL(opal_int_eoi);