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>
30 #include <asm/machdep.h>
32 #include <asm/firmware.h>
34 #include <asm/imc-pmu.h>
38 /* /sys/firmware/opal */
39 struct kobject
*opal_kobj
;
47 struct mcheck_recoverable_range
{
53 static struct mcheck_recoverable_range
*mc_recoverable_range
;
54 static int mc_recoverable_range_len
;
56 struct device_node
*opal_node
;
57 static DEFINE_SPINLOCK(opal_write_lock
);
58 static struct atomic_notifier_head opal_msg_notifier_head
[OPAL_MSG_TYPE_MAX
];
59 static uint32_t opal_heartbeat
;
60 static struct task_struct
*kopald_tsk
;
62 void opal_configure_cores(void)
66 /* Do the actual re-init, This will clobber all FPRs, VRs, etc...
68 * It will preserve non volatile GPRs and HSPRG0/1. It will
69 * also restore HIDs and other SPRs to their original value
70 * but it might clobber a bunch.
73 reinit_flags
|= OPAL_REINIT_CPUS_HILE_BE
;
75 reinit_flags
|= OPAL_REINIT_CPUS_HILE_LE
;
79 * POWER9 always support running hash:
80 * ie. Host hash supports hash guests
81 * Host radix supports hash/radix guests
83 if (early_cpu_has_feature(CPU_FTR_ARCH_300
)) {
84 reinit_flags
|= OPAL_REINIT_CPUS_MMU_HASH
;
85 if (early_radix_enabled())
86 reinit_flags
|= OPAL_REINIT_CPUS_MMU_RADIX
;
89 opal_reinit_cpus(reinit_flags
);
91 /* Restore some bits */
92 if (cur_cpu_spec
->cpu_restore
)
93 cur_cpu_spec
->cpu_restore();
96 int __init
early_init_dt_scan_opal(unsigned long node
,
97 const char *uname
, int depth
, void *data
)
99 const void *basep
, *entryp
, *sizep
;
100 int basesz
, entrysz
, runtimesz
;
102 if (depth
!= 1 || strcmp(uname
, "ibm,opal") != 0)
105 basep
= of_get_flat_dt_prop(node
, "opal-base-address", &basesz
);
106 entryp
= of_get_flat_dt_prop(node
, "opal-entry-address", &entrysz
);
107 sizep
= of_get_flat_dt_prop(node
, "opal-runtime-size", &runtimesz
);
109 if (!basep
|| !entryp
|| !sizep
)
112 opal
.base
= of_read_number(basep
, basesz
/4);
113 opal
.entry
= of_read_number(entryp
, entrysz
/4);
114 opal
.size
= of_read_number(sizep
, runtimesz
/4);
116 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n",
117 opal
.base
, basep
, basesz
);
118 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n",
119 opal
.entry
, entryp
, entrysz
);
120 pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n",
121 opal
.size
, sizep
, runtimesz
);
123 if (of_flat_dt_is_compatible(node
, "ibm,opal-v3")) {
124 powerpc_firmware_features
|= FW_FEATURE_OPAL
;
125 pr_info("OPAL detected !\n");
127 panic("OPAL != V3 detected, no longer supported.\n");
133 int __init
early_init_dt_scan_recoverable_ranges(unsigned long node
,
134 const char *uname
, int depth
, void *data
)
139 if (depth
!= 1 || strcmp(uname
, "ibm,opal") != 0)
142 prop
= of_get_flat_dt_prop(node
, "mcheck-recoverable-ranges", &psize
);
147 pr_debug("Found machine check recoverable ranges.\n");
150 * Calculate number of available entries.
152 * Each recoverable address range entry is (start address, len,
153 * recovery address), 2 cells each for start and recovery address,
154 * 1 cell for len, totalling 5 cells per entry.
156 mc_recoverable_range_len
= psize
/ (sizeof(*prop
) * 5);
159 if (!mc_recoverable_range_len
)
162 /* Size required to hold all the entries. */
163 size
= mc_recoverable_range_len
*
164 sizeof(struct mcheck_recoverable_range
);
167 * Allocate a buffer to hold the MC recoverable ranges.
169 mc_recoverable_range
=__va(memblock_alloc(size
, __alignof__(u64
)));
170 memset(mc_recoverable_range
, 0, size
);
172 for (i
= 0; i
< mc_recoverable_range_len
; i
++) {
173 mc_recoverable_range
[i
].start_addr
=
174 of_read_number(prop
+ (i
* 5) + 0, 2);
175 mc_recoverable_range
[i
].end_addr
=
176 mc_recoverable_range
[i
].start_addr
+
177 of_read_number(prop
+ (i
* 5) + 2, 1);
178 mc_recoverable_range
[i
].recover_addr
=
179 of_read_number(prop
+ (i
* 5) + 3, 2);
181 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n",
182 mc_recoverable_range
[i
].start_addr
,
183 mc_recoverable_range
[i
].end_addr
,
184 mc_recoverable_range
[i
].recover_addr
);
189 static int __init
opal_register_exception_handlers(void)
191 #ifdef __BIG_ENDIAN__
194 if (!(powerpc_firmware_features
& FW_FEATURE_OPAL
))
197 /* Hookup some exception handlers except machine check. We use the
198 * fwnmi area at 0x7000 to provide the glue space to OPAL
203 * Check if we are running on newer firmware that exports
204 * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch
205 * the HMI interrupt and we catch it directly in Linux.
207 * For older firmware (i.e currently released POWER8 System Firmware
208 * as of today <= SV810_087), we fallback to old behavior and let OPAL
209 * patch the HMI vector and handle it inside OPAL firmware.
211 * For newer firmware (in development/yet to be released) we will
212 * start catching/handling HMI directly in Linux.
214 if (!opal_check_token(OPAL_HANDLE_HMI
)) {
215 pr_info("Old firmware detected, OPAL handles HMIs.\n");
216 opal_register_exception_handler(
217 OPAL_HYPERVISOR_MAINTENANCE_HANDLER
,
222 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER
, 0, glue
);
227 machine_early_initcall(powernv
, opal_register_exception_handlers
);
230 * Opal message notifier based on message type. Allow subscribers to get
231 * notified for specific messgae type.
233 int opal_message_notifier_register(enum opal_msg_type msg_type
,
234 struct notifier_block
*nb
)
236 if (!nb
|| msg_type
>= OPAL_MSG_TYPE_MAX
) {
237 pr_warning("%s: Invalid arguments, msg_type:%d\n",
242 return atomic_notifier_chain_register(
243 &opal_msg_notifier_head
[msg_type
], nb
);
245 EXPORT_SYMBOL_GPL(opal_message_notifier_register
);
247 int opal_message_notifier_unregister(enum opal_msg_type msg_type
,
248 struct notifier_block
*nb
)
250 return atomic_notifier_chain_unregister(
251 &opal_msg_notifier_head
[msg_type
], nb
);
253 EXPORT_SYMBOL_GPL(opal_message_notifier_unregister
);
255 static void opal_message_do_notify(uint32_t msg_type
, void *msg
)
257 /* notify subscribers */
258 atomic_notifier_call_chain(&opal_msg_notifier_head
[msg_type
],
262 static void opal_handle_message(void)
266 * TODO: pre-allocate a message buffer depending on opal-msg-size
267 * value in /proc/device-tree.
269 static struct opal_msg msg
;
272 ret
= opal_get_msg(__pa(&msg
), sizeof(msg
));
273 /* No opal message pending. */
274 if (ret
== OPAL_RESOURCE
)
277 /* check for errors. */
279 pr_warning("%s: Failed to retrieve opal message, err=%lld\n",
284 type
= be32_to_cpu(msg
.msg_type
);
287 if (type
>= OPAL_MSG_TYPE_MAX
) {
288 pr_warn_once("%s: Unknown message type: %u\n", __func__
, type
);
291 opal_message_do_notify(type
, (void *)&msg
);
294 static irqreturn_t
opal_message_notify(int irq
, void *data
)
296 opal_handle_message();
300 static int __init
opal_message_init(void)
304 for (i
= 0; i
< OPAL_MSG_TYPE_MAX
; i
++)
305 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head
[i
]);
307 irq
= opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING
));
309 pr_err("%s: Can't register OPAL event irq (%d)\n",
314 ret
= request_irq(irq
, opal_message_notify
,
315 IRQ_TYPE_LEVEL_HIGH
, "opal-msg", NULL
);
317 pr_err("%s: Can't request OPAL event irq (%d)\n",
325 int opal_get_chars(uint32_t vtermno
, char *buf
, int count
)
332 opal_poll_events(&evt
);
333 if ((be64_to_cpu(evt
) & OPAL_EVENT_CONSOLE_INPUT
) == 0)
335 len
= cpu_to_be64(count
);
336 rc
= opal_console_read(vtermno
, &len
, buf
);
337 if (rc
== OPAL_SUCCESS
)
338 return be64_to_cpu(len
);
342 int opal_put_chars(uint32_t vtermno
, const char *data
, int total_len
)
353 /* We want put_chars to be atomic to avoid mangling of hvsi
354 * packets. To do that, we first test for room and return
355 * -EAGAIN if there isn't enough.
357 * Unfortunately, opal_console_write_buffer_space() doesn't
358 * appear to work on opal v1, so we just assume there is
359 * enough room and be done with it
361 spin_lock_irqsave(&opal_write_lock
, flags
);
362 rc
= opal_console_write_buffer_space(vtermno
, &olen
);
363 len
= be64_to_cpu(olen
);
364 if (rc
|| len
< total_len
) {
365 spin_unlock_irqrestore(&opal_write_lock
, flags
);
366 /* Closed -> drop characters */
369 opal_poll_events(NULL
);
373 /* We still try to handle partial completions, though they
374 * should no longer happen.
377 while(total_len
> 0 && (rc
== OPAL_BUSY
||
378 rc
== OPAL_BUSY_EVENT
|| rc
== OPAL_SUCCESS
)) {
379 olen
= cpu_to_be64(total_len
);
380 rc
= opal_console_write(vtermno
, &olen
, data
);
381 len
= be64_to_cpu(olen
);
383 /* Closed or other error drop */
384 if (rc
!= OPAL_SUCCESS
&& rc
!= OPAL_BUSY
&&
385 rc
!= OPAL_BUSY_EVENT
) {
389 if (rc
== OPAL_SUCCESS
) {
394 /* This is a bit nasty but we need that for the console to
395 * flush when there aren't any interrupts. We will clean
396 * things a bit later to limit that to synchronous path
397 * such as the kernel console and xmon/udbg
400 opal_poll_events(&evt
);
401 while(rc
== OPAL_SUCCESS
&&
402 (be64_to_cpu(evt
) & OPAL_EVENT_CONSOLE_OUTPUT
));
404 spin_unlock_irqrestore(&opal_write_lock
, flags
);
408 static int opal_recover_mce(struct pt_regs
*regs
,
409 struct machine_check_event
*evt
)
413 if (!(regs
->msr
& MSR_RI
)) {
414 /* If MSR_RI isn't set, we cannot recover */
415 pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n");
417 } else if (evt
->disposition
== MCE_DISPOSITION_RECOVERED
) {
418 /* Platform corrected itself */
420 } else if (evt
->severity
== MCE_SEV_FATAL
) {
421 /* Fatal machine check */
422 pr_err("Machine check interrupt is fatal\n");
424 } else if ((evt
->severity
== MCE_SEV_ERROR_SYNC
) &&
425 (user_mode(regs
) && !is_global_init(current
))) {
427 * For now, kill the task if we have received exception when
430 * TODO: Queue up this address for hwpoisioning later.
432 _exception(SIGBUS
, regs
, BUS_MCEERR_AR
, regs
->nip
);
438 int opal_machine_check(struct pt_regs
*regs
)
440 struct machine_check_event evt
;
443 if (!get_mce_event(&evt
, MCE_EVENT_RELEASE
))
446 /* Print things out */
447 if (evt
.version
!= MCE_V1
) {
448 pr_err("Machine Check Exception, Unknown event version %d !\n",
452 machine_check_print_event_info(&evt
, user_mode(regs
));
454 if (opal_recover_mce(regs
, &evt
))
458 * Unrecovered machine check, we are heading to panic path.
460 * We may have hit this MCE in very early stage of kernel
461 * initialization even before opal-prd has started running. If
462 * this is the case then this MCE error may go un-noticed or
463 * un-analyzed if we go down panic path. We need to inform
464 * BMC/OCC about this error so that they can collect relevant
465 * data for error analysis before rebooting.
466 * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so.
467 * This function may not return on BMC based system.
469 ret
= opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR
,
470 "Unrecoverable Machine Check exception");
471 if (ret
== OPAL_UNSUPPORTED
) {
472 pr_emerg("Reboot type %d not supported\n",
473 OPAL_REBOOT_PLATFORM_ERROR
);
477 * We reached here. There can be three possibilities:
478 * 1. We are running on a firmware level that do not support
480 * 2. We are running on a firmware level that do not support
481 * OPAL_REBOOT_PLATFORM_ERROR reboot type.
482 * 3. We are running on FSP based system that does not need opal
483 * to trigger checkstop explicitly for error analysis. The FSP
484 * PRD component would have already got notified about this
485 * error through other channels.
487 * If hardware marked this as an unrecoverable MCE, we are
488 * going to panic anyway. Even if it didn't, it's not safe to
489 * continue at this point, so we should explicitly panic.
492 panic("PowerNV Unrecovered Machine Check");
496 /* Early hmi handler called in real mode. */
497 int opal_hmi_exception_early(struct pt_regs
*regs
)
502 * call opal hmi handler. Pass paca address as token.
503 * The return value OPAL_SUCCESS is an indication that there is
504 * an HMI event generated waiting to pull by Linux.
506 rc
= opal_handle_hmi();
507 if (rc
== OPAL_SUCCESS
) {
508 local_paca
->hmi_event_available
= 1;
514 /* HMI exception handler called in virtual mode during check_irq_replay. */
515 int opal_handle_hmi_exception(struct pt_regs
*regs
)
521 * Check if HMI event is available.
522 * if Yes, then call opal_poll_events to pull opal messages and
525 if (!local_paca
->hmi_event_available
)
528 local_paca
->hmi_event_available
= 0;
529 rc
= opal_poll_events(&evt
);
530 if (rc
== OPAL_SUCCESS
&& evt
)
531 opal_handle_events(be64_to_cpu(evt
));
536 static uint64_t find_recovery_address(uint64_t nip
)
540 for (i
= 0; i
< mc_recoverable_range_len
; i
++)
541 if ((nip
>= mc_recoverable_range
[i
].start_addr
) &&
542 (nip
< mc_recoverable_range
[i
].end_addr
))
543 return mc_recoverable_range
[i
].recover_addr
;
547 bool opal_mce_check_early_recovery(struct pt_regs
*regs
)
549 uint64_t recover_addr
= 0;
551 if (!opal
.base
|| !opal
.size
)
554 if ((regs
->nip
>= opal
.base
) &&
555 (regs
->nip
< (opal
.base
+ opal
.size
)))
556 recover_addr
= find_recovery_address(regs
->nip
);
559 * Setup regs->nip to rfi into fixup address.
562 regs
->nip
= recover_addr
;
565 return !!recover_addr
;
568 static int opal_sysfs_init(void)
570 opal_kobj
= kobject_create_and_add("opal", firmware_kobj
);
572 pr_warn("kobject_create_and_add opal failed\n");
579 static ssize_t
symbol_map_read(struct file
*fp
, struct kobject
*kobj
,
580 struct bin_attribute
*bin_attr
,
581 char *buf
, loff_t off
, size_t count
)
583 return memory_read_from_buffer(buf
, count
, &off
, bin_attr
->private,
587 static BIN_ATTR_RO(symbol_map
, 0);
589 static void opal_export_symmap(void)
593 struct device_node
*fw
;
596 fw
= of_find_node_by_path("/ibm,opal/firmware");
599 syms
= of_get_property(fw
, "symbol-map", &size
);
600 if (!syms
|| size
!= 2 * sizeof(__be64
))
603 /* Setup attributes */
604 bin_attr_symbol_map
.private = __va(be64_to_cpu(syms
[0]));
605 bin_attr_symbol_map
.size
= be64_to_cpu(syms
[1]);
607 rc
= sysfs_create_bin_file(opal_kobj
, &bin_attr_symbol_map
);
609 pr_warn("Error %d creating OPAL symbols file\n", rc
);
612 static ssize_t
export_attr_read(struct file
*fp
, struct kobject
*kobj
,
613 struct bin_attribute
*bin_attr
, char *buf
,
614 loff_t off
, size_t count
)
616 return memory_read_from_buffer(buf
, count
, &off
, bin_attr
->private,
621 * opal_export_attrs: creates a sysfs node for each property listed in
622 * the device-tree under /ibm,opal/firmware/exports/
623 * All new sysfs nodes are created under /opal/exports/.
624 * This allows for reserved memory regions (e.g. HDAT) to be read.
625 * The new sysfs nodes are only readable by root.
627 static void opal_export_attrs(void)
629 struct bin_attribute
*attr
;
630 struct device_node
*np
;
631 struct property
*prop
;
632 struct kobject
*kobj
;
636 np
= of_find_node_by_path("/ibm,opal/firmware/exports");
640 /* Create new 'exports' directory - /sys/firmware/opal/exports */
641 kobj
= kobject_create_and_add("exports", opal_kobj
);
643 pr_warn("kobject_create_and_add() of exports failed\n");
647 for_each_property_of_node(np
, prop
) {
648 if (!strcmp(prop
->name
, "name") || !strcmp(prop
->name
, "phandle"))
651 if (of_property_read_u64_array(np
, prop
->name
, &vals
[0], 2))
654 attr
= kzalloc(sizeof(*attr
), GFP_KERNEL
);
657 pr_warn("Failed kmalloc for bin_attribute!");
661 sysfs_bin_attr_init(attr
);
662 attr
->attr
.name
= kstrdup(prop
->name
, GFP_KERNEL
);
663 attr
->attr
.mode
= 0400;
664 attr
->read
= export_attr_read
;
665 attr
->private = __va(vals
[0]);
666 attr
->size
= vals
[1];
668 if (attr
->attr
.name
== NULL
) {
669 pr_warn("Failed kstrdup for bin_attribute attr.name");
674 rc
= sysfs_create_bin_file(kobj
, attr
);
676 pr_warn("Error %d creating OPAL sysfs exports/%s file\n",
678 kfree(attr
->attr
.name
);
686 static void __init
opal_dump_region_init(void)
692 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION
))
695 /* Register kernel log buffer */
696 addr
= log_buf_addr_get();
700 size
= log_buf_len_get();
704 rc
= opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF
,
706 /* Don't warn if this is just an older OPAL that doesn't
707 * know about that call
709 if (rc
&& rc
!= OPAL_UNSUPPORTED
)
710 pr_warn("DUMP: Failed to register kernel log buffer. "
714 static void opal_pdev_init(const char *compatible
)
716 struct device_node
*np
;
718 for_each_compatible_node(np
, NULL
, compatible
)
719 of_platform_device_create(np
, NULL
, NULL
);
722 static void __init
opal_imc_init_dev(void)
724 struct device_node
*np
;
726 np
= of_find_compatible_node(NULL
, NULL
, IMC_DTB_COMPAT
);
728 of_platform_device_create(np
, NULL
, NULL
);
731 static int kopald(void *unused
)
733 unsigned long timeout
= msecs_to_jiffies(opal_heartbeat
) + 1;
739 opal_poll_events(&events
);
740 opal_handle_events(be64_to_cpu(events
));
741 schedule_timeout_interruptible(timeout
);
742 } while (!kthread_should_stop());
747 void opal_wake_poller(void)
750 wake_up_process(kopald_tsk
);
753 static void opal_init_heartbeat(void)
755 /* Old firwmware, we assume the HVC heartbeat is sufficient */
756 if (of_property_read_u32(opal_node
, "ibm,heartbeat-ms",
757 &opal_heartbeat
) != 0)
761 kopald_tsk
= kthread_run(kopald
, NULL
, "kopald");
764 static int __init
opal_init(void)
766 struct device_node
*np
, *consoles
, *leds
;
769 opal_node
= of_find_node_by_path("/ibm,opal");
771 pr_warn("Device node not found\n");
775 /* Register OPAL consoles if any ports */
776 consoles
= of_find_node_by_path("/ibm,opal/consoles");
778 for_each_child_of_node(consoles
, np
) {
779 if (strcmp(np
->name
, "serial"))
781 of_platform_device_create(np
, NULL
, NULL
);
783 of_node_put(consoles
);
786 /* Initialise OPAL messaging system */
789 /* Initialise OPAL asynchronous completion interface */
790 opal_async_comp_init();
792 /* Initialise OPAL sensor interface */
795 /* Initialise OPAL hypervisor maintainence interrupt handling */
796 opal_hmi_handler_init();
798 /* Create i2c platform devices */
799 opal_pdev_init("ibm,opal-i2c");
801 /* Setup a heatbeat thread if requested by OPAL */
802 opal_init_heartbeat();
804 /* Detect In-Memory Collection counters and create devices*/
807 /* Create leds platform devices */
808 leds
= of_find_node_by_path("/ibm,opal/leds");
810 of_platform_device_create(leds
, "opal_leds", NULL
);
814 /* Initialise OPAL message log interface */
817 /* Create "opal" kobject under /sys/firmware */
818 rc
= opal_sysfs_init();
820 /* Export symbol map to userspace */
821 opal_export_symmap();
822 /* Setup dump region interface */
823 opal_dump_region_init();
824 /* Setup error log interface */
825 rc
= opal_elog_init();
826 /* Setup code update interface */
827 opal_flash_update_init();
828 /* Setup platform dump extract interface */
829 opal_platform_dump_init();
830 /* Setup system parameters interface */
831 opal_sys_param_init();
832 /* Setup message log sysfs interface. */
833 opal_msglog_sysfs_init();
836 /* Export all properties */
839 /* Initialize platform devices: IPMI backend, PRD & flash interface */
840 opal_pdev_init("ibm,opal-ipmi");
841 opal_pdev_init("ibm,opal-flash");
842 opal_pdev_init("ibm,opal-prd");
844 /* Initialise platform device: oppanel interface */
845 opal_pdev_init("ibm,opal-oppanel");
847 /* Initialise OPAL kmsg dumper for flushing console on panic */
850 /* Initialise OPAL powercap interface */
851 opal_powercap_init();
853 /* Initialise OPAL Power-Shifting-Ratio interface */
856 /* Initialise OPAL sensor groups */
857 opal_sensor_groups_init();
861 machine_subsys_initcall(powernv
, opal_init
);
863 void opal_shutdown(void)
867 opal_event_shutdown();
870 * Then sync with OPAL which ensure anything that can
871 * potentially write to our memory has completed such
872 * as an ongoing dump retrieval
874 while (rc
== OPAL_BUSY
|| rc
== OPAL_BUSY_EVENT
) {
875 rc
= opal_sync_host_reboot();
877 opal_poll_events(NULL
);
882 /* Unregister memory dump region */
883 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION
))
884 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF
);
887 /* Export this so that test modules can use it */
888 EXPORT_SYMBOL_GPL(opal_invalid_call
);
889 EXPORT_SYMBOL_GPL(opal_xscom_read
);
890 EXPORT_SYMBOL_GPL(opal_xscom_write
);
891 EXPORT_SYMBOL_GPL(opal_ipmi_send
);
892 EXPORT_SYMBOL_GPL(opal_ipmi_recv
);
893 EXPORT_SYMBOL_GPL(opal_flash_read
);
894 EXPORT_SYMBOL_GPL(opal_flash_write
);
895 EXPORT_SYMBOL_GPL(opal_flash_erase
);
896 EXPORT_SYMBOL_GPL(opal_prd_msg
);
898 /* Convert a region of vmalloc memory to an opal sg list */
899 struct opal_sg_list
*opal_vmalloc_to_sg_list(void *vmalloc_addr
,
900 unsigned long vmalloc_size
)
902 struct opal_sg_list
*sg
, *first
= NULL
;
905 sg
= kzalloc(PAGE_SIZE
, GFP_KERNEL
);
911 while (vmalloc_size
> 0) {
912 uint64_t data
= vmalloc_to_pfn(vmalloc_addr
) << PAGE_SHIFT
;
913 uint64_t length
= min(vmalloc_size
, PAGE_SIZE
);
915 sg
->entry
[i
].data
= cpu_to_be64(data
);
916 sg
->entry
[i
].length
= cpu_to_be64(length
);
919 if (i
>= SG_ENTRIES_PER_NODE
) {
920 struct opal_sg_list
*next
;
922 next
= kzalloc(PAGE_SIZE
, GFP_KERNEL
);
926 sg
->length
= cpu_to_be64(
927 i
* sizeof(struct opal_sg_entry
) + 16);
929 sg
->next
= cpu_to_be64(__pa(next
));
933 vmalloc_addr
+= length
;
934 vmalloc_size
-= length
;
937 sg
->length
= cpu_to_be64(i
* sizeof(struct opal_sg_entry
) + 16);
942 pr_err("%s : Failed to allocate memory\n", __func__
);
943 opal_free_sg_list(first
);
947 void opal_free_sg_list(struct opal_sg_list
*sg
)
950 uint64_t next
= be64_to_cpu(sg
->next
);
961 int opal_error_code(int rc
)
964 case OPAL_SUCCESS
: return 0;
966 case OPAL_PARAMETER
: return -EINVAL
;
967 case OPAL_ASYNC_COMPLETION
: return -EINPROGRESS
;
968 case OPAL_BUSY_EVENT
: return -EBUSY
;
969 case OPAL_NO_MEM
: return -ENOMEM
;
970 case OPAL_PERMISSION
: return -EPERM
;
972 case OPAL_UNSUPPORTED
: return -EIO
;
973 case OPAL_HARDWARE
: return -EIO
;
974 case OPAL_INTERNAL_ERROR
: return -EIO
;
975 case OPAL_TIMEOUT
: return -ETIMEDOUT
;
977 pr_err("%s: unexpected OPAL error %d\n", __func__
, rc
);
982 void powernv_set_nmmu_ptcr(unsigned long ptcr
)
986 if (firmware_has_feature(FW_FEATURE_OPAL
)) {
987 rc
= opal_nmmu_set_ptcr(-1UL, ptcr
);
988 if (rc
!= OPAL_SUCCESS
&& rc
!= OPAL_UNSUPPORTED
)
989 pr_warn("%s: Unable to set nest mmu ptcr\n", __func__
);
993 EXPORT_SYMBOL_GPL(opal_poll_events
);
994 EXPORT_SYMBOL_GPL(opal_rtc_read
);
995 EXPORT_SYMBOL_GPL(opal_rtc_write
);
996 EXPORT_SYMBOL_GPL(opal_tpo_read
);
997 EXPORT_SYMBOL_GPL(opal_tpo_write
);
998 EXPORT_SYMBOL_GPL(opal_i2c_request
);
999 /* Export these symbols for PowerNV LED class driver */
1000 EXPORT_SYMBOL_GPL(opal_leds_get_ind
);
1001 EXPORT_SYMBOL_GPL(opal_leds_set_ind
);
1002 /* Export this symbol for PowerNV Operator Panel class driver */
1003 EXPORT_SYMBOL_GPL(opal_write_oppanel_async
);
1004 /* Export this for KVM */
1005 EXPORT_SYMBOL_GPL(opal_int_set_mfrr
);
1006 EXPORT_SYMBOL_GPL(opal_int_eoi
);