1/*
2 * PowerNV OPAL high level interfaces
3 *
4 * Copyright 2011 IBM Corp.
5 *
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.
10 */
11
12#undef DEBUG
13
14#include <linux/types.h>
15#include <linux/of.h>
16#include <linux/of_fdt.h>
17#include <linux/of_platform.h>
18#include <linux/interrupt.h>
19#include <linux/notifier.h>
20#include <linux/slab.h>
21#include <linux/sched.h>
22#include <linux/kobject.h>
23#include <linux/delay.h>
24#include <linux/memblock.h>
25
26#include <asm/machdep.h>
27#include <asm/opal.h>
28#include <asm/firmware.h>
29#include <asm/mce.h>
30
31#include "powernv.h"
32
33/* /sys/firmware/opal */
34struct kobject *opal_kobj;
35
36struct opal {
37	u64 base;
38	u64 entry;
39	u64 size;
40} opal;
41
42struct mcheck_recoverable_range {
43	u64 start_addr;
44	u64 end_addr;
45	u64 recover_addr;
46};
47
48static struct mcheck_recoverable_range *mc_recoverable_range;
49static int mc_recoverable_range_len;
50
51struct device_node *opal_node;
52static DEFINE_SPINLOCK(opal_write_lock);
53extern u64 opal_mc_secondary_handler[];
54static unsigned int *opal_irqs;
55static unsigned int opal_irq_count;
56static ATOMIC_NOTIFIER_HEAD(opal_notifier_head);
57static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
58static DEFINE_SPINLOCK(opal_notifier_lock);
59static uint64_t last_notified_mask = 0x0ul;
60static atomic_t opal_notifier_hold = ATOMIC_INIT(0);
61
62static void opal_reinit_cores(void)
63{
64	/* Do the actual re-init, This will clobber all FPRs, VRs, etc...
65	 *
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.
69	 */
70#ifdef __BIG_ENDIAN__
71	opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
72#else
73	opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE);
74#endif
75}
76
77int __init early_init_dt_scan_opal(unsigned long node,
78				   const char *uname, int depth, void *data)
79{
80	const void *basep, *entryp, *sizep;
81	int basesz, entrysz, runtimesz;
82
83	if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
84		return 0;
85
86	basep  = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
87	entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
88	sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz);
89
90	if (!basep || !entryp || !sizep)
91		return 1;
92
93	opal.base = of_read_number(basep, basesz/4);
94	opal.entry = of_read_number(entryp, entrysz/4);
95	opal.size = of_read_number(sizep, runtimesz/4);
96
97	pr_debug("OPAL Base  = 0x%llx (basep=%p basesz=%d)\n",
98		 opal.base, basep, basesz);
99	pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n",
100		 opal.entry, entryp, entrysz);
101	pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n",
102		 opal.size, sizep, runtimesz);
103
104	powerpc_firmware_features |= FW_FEATURE_OPAL;
105	if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
106		powerpc_firmware_features |= FW_FEATURE_OPALv2;
107		powerpc_firmware_features |= FW_FEATURE_OPALv3;
108		pr_info("OPAL V3 detected !\n");
109	} else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
110		powerpc_firmware_features |= FW_FEATURE_OPALv2;
111		pr_info("OPAL V2 detected !\n");
112	} else {
113		pr_info("OPAL V1 detected !\n");
114	}
115
116	/* Reinit all cores with the right endian */
117	opal_reinit_cores();
118
119	/* Restore some bits */
120	if (cur_cpu_spec->cpu_restore)
121		cur_cpu_spec->cpu_restore();
122
123	return 1;
124}
125
126int __init early_init_dt_scan_recoverable_ranges(unsigned long node,
127				   const char *uname, int depth, void *data)
128{
129	int i, psize, size;
130	const __be32 *prop;
131
132	if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
133		return 0;
134
135	prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize);
136
137	if (!prop)
138		return 1;
139
140	pr_debug("Found machine check recoverable ranges.\n");
141
142	/*
143	 * Calculate number of available entries.
144	 *
145	 * Each recoverable address range entry is (start address, len,
146	 * recovery address), 2 cells each for start and recovery address,
147	 * 1 cell for len, totalling 5 cells per entry.
148	 */
149	mc_recoverable_range_len = psize / (sizeof(*prop) * 5);
150
151	/* Sanity check */
152	if (!mc_recoverable_range_len)
153		return 1;
154
155	/* Size required to hold all the entries. */
156	size = mc_recoverable_range_len *
157			sizeof(struct mcheck_recoverable_range);
158
159	/*
160	 * Allocate a buffer to hold the MC recoverable ranges. We would be
161	 * accessing them in real mode, hence it needs to be within
162	 * RMO region.
163	 */
164	mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64),
165							ppc64_rma_size));
166	memset(mc_recoverable_range, 0, size);
167
168	for (i = 0; i < mc_recoverable_range_len; i++) {
169		mc_recoverable_range[i].start_addr =
170					of_read_number(prop + (i * 5) + 0, 2);
171		mc_recoverable_range[i].end_addr =
172					mc_recoverable_range[i].start_addr +
173					of_read_number(prop + (i * 5) + 2, 1);
174		mc_recoverable_range[i].recover_addr =
175					of_read_number(prop + (i * 5) + 3, 2);
176
177		pr_debug("Machine check recoverable range: %llx..%llx: %llx\n",
178				mc_recoverable_range[i].start_addr,
179				mc_recoverable_range[i].end_addr,
180				mc_recoverable_range[i].recover_addr);
181	}
182	return 1;
183}
184
185static int __init opal_register_exception_handlers(void)
186{
187#ifdef __BIG_ENDIAN__
188	u64 glue;
189
190	if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
191		return -ENODEV;
192
193	/* Hookup some exception handlers except machine check. We use the
194	 * fwnmi area at 0x7000 to provide the glue space to OPAL
195	 */
196	glue = 0x7000;
197
198	/*
199	 * Check if we are running on newer firmware that exports
200	 * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch
201	 * the HMI interrupt and we catch it directly in Linux.
202	 *
203	 * For older firmware (i.e currently released POWER8 System Firmware
204	 * as of today <= SV810_087), we fallback to old behavior and let OPAL
205	 * patch the HMI vector and handle it inside OPAL firmware.
206	 *
207	 * For newer firmware (in development/yet to be released) we will
208	 * start catching/handling HMI directly in Linux.
209	 */
210	if (!opal_check_token(OPAL_HANDLE_HMI)) {
211		pr_info("opal: Old firmware detected, OPAL handles HMIs.\n");
212		opal_register_exception_handler(
213				OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
214				0, glue);
215		glue += 128;
216	}
217
218	opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
219#endif
220
221	return 0;
222}
223machine_early_initcall(powernv, opal_register_exception_handlers);
224
225int opal_notifier_register(struct notifier_block *nb)
226{
227	if (!nb) {
228		pr_warning("%s: Invalid argument (%p)\n",
229			   __func__, nb);
230		return -EINVAL;
231	}
232
233	atomic_notifier_chain_register(&opal_notifier_head, nb);
234	return 0;
235}
236EXPORT_SYMBOL_GPL(opal_notifier_register);
237
238int opal_notifier_unregister(struct notifier_block *nb)
239{
240	if (!nb) {
241		pr_warning("%s: Invalid argument (%p)\n",
242			   __func__, nb);
243		return -EINVAL;
244	}
245
246	atomic_notifier_chain_unregister(&opal_notifier_head, nb);
247	return 0;
248}
249EXPORT_SYMBOL_GPL(opal_notifier_unregister);
250
251static void opal_do_notifier(uint64_t events)
252{
253	unsigned long flags;
254	uint64_t changed_mask;
255
256	if (atomic_read(&opal_notifier_hold))
257		return;
258
259	spin_lock_irqsave(&opal_notifier_lock, flags);
260	changed_mask = last_notified_mask ^ events;
261	last_notified_mask = events;
262	spin_unlock_irqrestore(&opal_notifier_lock, flags);
263
264	/*
265	 * We feed with the event bits and changed bits for
266	 * enough information to the callback.
267	 */
268	atomic_notifier_call_chain(&opal_notifier_head,
269				   events, (void *)changed_mask);
270}
271
272void opal_notifier_update_evt(uint64_t evt_mask,
273			      uint64_t evt_val)
274{
275	unsigned long flags;
276
277	spin_lock_irqsave(&opal_notifier_lock, flags);
278	last_notified_mask &= ~evt_mask;
279	last_notified_mask |= evt_val;
280	spin_unlock_irqrestore(&opal_notifier_lock, flags);
281}
282
283void opal_notifier_enable(void)
284{
285	int64_t rc;
286	__be64 evt = 0;
287
288	atomic_set(&opal_notifier_hold, 0);
289
290	/* Process pending events */
291	rc = opal_poll_events(&evt);
292	if (rc == OPAL_SUCCESS && evt)
293		opal_do_notifier(be64_to_cpu(evt));
294}
295
296void opal_notifier_disable(void)
297{
298	atomic_set(&opal_notifier_hold, 1);
299}
300
301/*
302 * Opal message notifier based on message type. Allow subscribers to get
303 * notified for specific messgae type.
304 */
305int opal_message_notifier_register(enum OpalMessageType msg_type,
306					struct notifier_block *nb)
307{
308	if (!nb) {
309		pr_warning("%s: Invalid argument (%p)\n",
310			   __func__, nb);
311		return -EINVAL;
312	}
313	if (msg_type > OPAL_MSG_TYPE_MAX) {
314		pr_warning("%s: Invalid message type argument (%d)\n",
315			   __func__, msg_type);
316		return -EINVAL;
317	}
318	return atomic_notifier_chain_register(
319				&opal_msg_notifier_head[msg_type], nb);
320}
321
322static void opal_message_do_notify(uint32_t msg_type, void *msg)
323{
324	/* notify subscribers */
325	atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type],
326					msg_type, msg);
327}
328
329static void opal_handle_message(void)
330{
331	s64 ret;
332	/*
333	 * TODO: pre-allocate a message buffer depending on opal-msg-size
334	 * value in /proc/device-tree.
335	 */
336	static struct opal_msg msg;
337	u32 type;
338
339	ret = opal_get_msg(__pa(&msg), sizeof(msg));
340	/* No opal message pending. */
341	if (ret == OPAL_RESOURCE)
342		return;
343
344	/* check for errors. */
345	if (ret) {
346		pr_warning("%s: Failed to retrieve opal message, err=%lld\n",
347				__func__, ret);
348		return;
349	}
350
351	type = be32_to_cpu(msg.msg_type);
352
353	/* Sanity check */
354	if (type > OPAL_MSG_TYPE_MAX) {
355		pr_warning("%s: Unknown message type: %u\n", __func__, type);
356		return;
357	}
358	opal_message_do_notify(type, (void *)&msg);
359}
360
361static int opal_message_notify(struct notifier_block *nb,
362			  unsigned long events, void *change)
363{
364	if (events & OPAL_EVENT_MSG_PENDING)
365		opal_handle_message();
366	return 0;
367}
368
369static struct notifier_block opal_message_nb = {
370	.notifier_call	= opal_message_notify,
371	.next		= NULL,
372	.priority	= 0,
373};
374
375static int __init opal_message_init(void)
376{
377	int ret, i;
378
379	for (i = 0; i < OPAL_MSG_TYPE_MAX; i++)
380		ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]);
381
382	ret = opal_notifier_register(&opal_message_nb);
383	if (ret) {
384		pr_err("%s: Can't register OPAL event notifier (%d)\n",
385		       __func__, ret);
386		return ret;
387	}
388	return 0;
389}
390machine_early_initcall(powernv, opal_message_init);
391
392int opal_get_chars(uint32_t vtermno, char *buf, int count)
393{
394	s64 rc;
395	__be64 evt, len;
396
397	if (!opal.entry)
398		return -ENODEV;
399	opal_poll_events(&evt);
400	if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0)
401		return 0;
402	len = cpu_to_be64(count);
403	rc = opal_console_read(vtermno, &len, buf);
404	if (rc == OPAL_SUCCESS)
405		return be64_to_cpu(len);
406	return 0;
407}
408
409int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
410{
411	int written = 0;
412	__be64 olen;
413	s64 len, rc;
414	unsigned long flags;
415	__be64 evt;
416
417	if (!opal.entry)
418		return -ENODEV;
419
420	/* We want put_chars to be atomic to avoid mangling of hvsi
421	 * packets. To do that, we first test for room and return
422	 * -EAGAIN if there isn't enough.
423	 *
424	 * Unfortunately, opal_console_write_buffer_space() doesn't
425	 * appear to work on opal v1, so we just assume there is
426	 * enough room and be done with it
427	 */
428	spin_lock_irqsave(&opal_write_lock, flags);
429	if (firmware_has_feature(FW_FEATURE_OPALv2)) {
430		rc = opal_console_write_buffer_space(vtermno, &olen);
431		len = be64_to_cpu(olen);
432		if (rc || len < total_len) {
433			spin_unlock_irqrestore(&opal_write_lock, flags);
434			/* Closed -> drop characters */
435			if (rc)
436				return total_len;
437			opal_poll_events(NULL);
438			return -EAGAIN;
439		}
440	}
441
442	/* We still try to handle partial completions, though they
443	 * should no longer happen.
444	 */
445	rc = OPAL_BUSY;
446	while(total_len > 0 && (rc == OPAL_BUSY ||
447				rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
448		olen = cpu_to_be64(total_len);
449		rc = opal_console_write(vtermno, &olen, data);
450		len = be64_to_cpu(olen);
451
452		/* Closed or other error drop */
453		if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
454		    rc != OPAL_BUSY_EVENT) {
455			written = total_len;
456			break;
457		}
458		if (rc == OPAL_SUCCESS) {
459			total_len -= len;
460			data += len;
461			written += len;
462		}
463		/* This is a bit nasty but we need that for the console to
464		 * flush when there aren't any interrupts. We will clean
465		 * things a bit later to limit that to synchronous path
466		 * such as the kernel console and xmon/udbg
467		 */
468		do
469			opal_poll_events(&evt);
470		while(rc == OPAL_SUCCESS &&
471			(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT));
472	}
473	spin_unlock_irqrestore(&opal_write_lock, flags);
474	return written;
475}
476
477static int opal_recover_mce(struct pt_regs *regs,
478					struct machine_check_event *evt)
479{
480	int recovered = 0;
481	uint64_t ea = get_mce_fault_addr(evt);
482
483	if (!(regs->msr & MSR_RI)) {
484		/* If MSR_RI isn't set, we cannot recover */
485		recovered = 0;
486	} else if (evt->disposition == MCE_DISPOSITION_RECOVERED) {
487		/* Platform corrected itself */
488		recovered = 1;
489	} else if (ea && !is_kernel_addr(ea)) {
490		/*
491		 * Faulting address is not in kernel text. We should be fine.
492		 * We need to find which process uses this address.
493		 * For now, kill the task if we have received exception when
494		 * in userspace.
495		 *
496		 * TODO: Queue up this address for hwpoisioning later.
497		 */
498		if (user_mode(regs) && !is_global_init(current)) {
499			_exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
500			recovered = 1;
501		} else
502			recovered = 0;
503	} else if (user_mode(regs) && !is_global_init(current) &&
504		evt->severity == MCE_SEV_ERROR_SYNC) {
505		/*
506		 * If we have received a synchronous error when in userspace
507		 * kill the task.
508		 */
509		_exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
510		recovered = 1;
511	}
512	return recovered;
513}
514
515int opal_machine_check(struct pt_regs *regs)
516{
517	struct machine_check_event evt;
518
519	if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
520		return 0;
521
522	/* Print things out */
523	if (evt.version != MCE_V1) {
524		pr_err("Machine Check Exception, Unknown event version %d !\n",
525		       evt.version);
526		return 0;
527	}
528	machine_check_print_event_info(&evt);
529
530	if (opal_recover_mce(regs, &evt))
531		return 1;
532	return 0;
533}
534
535/* Early hmi handler called in real mode. */
536int opal_hmi_exception_early(struct pt_regs *regs)
537{
538	s64 rc;
539
540	/*
541	 * call opal hmi handler. Pass paca address as token.
542	 * The return value OPAL_SUCCESS is an indication that there is
543	 * an HMI event generated waiting to pull by Linux.
544	 */
545	rc = opal_handle_hmi();
546	if (rc == OPAL_SUCCESS) {
547		local_paca->hmi_event_available = 1;
548		return 1;
549	}
550	return 0;
551}
552
553/* HMI exception handler called in virtual mode during check_irq_replay. */
554int opal_handle_hmi_exception(struct pt_regs *regs)
555{
556	s64 rc;
557	__be64 evt = 0;
558
559	/*
560	 * Check if HMI event is available.
561	 * if Yes, then call opal_poll_events to pull opal messages and
562	 * process them.
563	 */
564	if (!local_paca->hmi_event_available)
565		return 0;
566
567	local_paca->hmi_event_available = 0;
568	rc = opal_poll_events(&evt);
569	if (rc == OPAL_SUCCESS && evt)
570		opal_do_notifier(be64_to_cpu(evt));
571
572	return 1;
573}
574
575static uint64_t find_recovery_address(uint64_t nip)
576{
577	int i;
578
579	for (i = 0; i < mc_recoverable_range_len; i++)
580		if ((nip >= mc_recoverable_range[i].start_addr) &&
581		    (nip < mc_recoverable_range[i].end_addr))
582		    return mc_recoverable_range[i].recover_addr;
583	return 0;
584}
585
586bool opal_mce_check_early_recovery(struct pt_regs *regs)
587{
588	uint64_t recover_addr = 0;
589
590	if (!opal.base || !opal.size)
591		goto out;
592
593	if ((regs->nip >= opal.base) &&
594			(regs->nip <= (opal.base + opal.size)))
595		recover_addr = find_recovery_address(regs->nip);
596
597	/*
598	 * Setup regs->nip to rfi into fixup address.
599	 */
600	if (recover_addr)
601		regs->nip = recover_addr;
602
603out:
604	return !!recover_addr;
605}
606
607static irqreturn_t opal_interrupt(int irq, void *data)
608{
609	__be64 events;
610
611	opal_handle_interrupt(virq_to_hw(irq), &events);
612
613	opal_do_notifier(be64_to_cpu(events));
614
615	return IRQ_HANDLED;
616}
617
618static int opal_sysfs_init(void)
619{
620	opal_kobj = kobject_create_and_add("opal", firmware_kobj);
621	if (!opal_kobj) {
622		pr_warn("kobject_create_and_add opal failed\n");
623		return -ENOMEM;
624	}
625
626	return 0;
627}
628
629static void __init opal_dump_region_init(void)
630{
631	void *addr;
632	uint64_t size;
633	int rc;
634
635	/* Register kernel log buffer */
636	addr = log_buf_addr_get();
637	size = log_buf_len_get();
638	rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
639				       __pa(addr), size);
640	/* Don't warn if this is just an older OPAL that doesn't
641	 * know about that call
642	 */
643	if (rc && rc != OPAL_UNSUPPORTED)
644		pr_warn("DUMP: Failed to register kernel log buffer. "
645			"rc = %d\n", rc);
646}
647static int __init opal_init(void)
648{
649	struct device_node *np, *consoles;
650	const __be32 *irqs;
651	int rc, i, irqlen;
652
653	opal_node = of_find_node_by_path("/ibm,opal");
654	if (!opal_node) {
655		pr_warn("opal: Node not found\n");
656		return -ENODEV;
657	}
658
659	/* Register OPAL consoles if any ports */
660	if (firmware_has_feature(FW_FEATURE_OPALv2))
661		consoles = of_find_node_by_path("/ibm,opal/consoles");
662	else
663		consoles = of_node_get(opal_node);
664	if (consoles) {
665		for_each_child_of_node(consoles, np) {
666			if (strcmp(np->name, "serial"))
667				continue;
668			of_platform_device_create(np, NULL, NULL);
669		}
670		of_node_put(consoles);
671	}
672
673	/* Find all OPAL interrupts and request them */
674	irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
675	pr_debug("opal: Found %d interrupts reserved for OPAL\n",
676		 irqs ? (irqlen / 4) : 0);
677	opal_irq_count = irqlen / 4;
678	opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL);
679	for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) {
680		unsigned int hwirq = be32_to_cpup(irqs);
681		unsigned int irq = irq_create_mapping(NULL, hwirq);
682		if (irq == NO_IRQ) {
683			pr_warning("opal: Failed to map irq 0x%x\n", hwirq);
684			continue;
685		}
686		rc = request_irq(irq, opal_interrupt, 0, "opal", NULL);
687		if (rc)
688			pr_warning("opal: Error %d requesting irq %d"
689				   " (0x%x)\n", rc, irq, hwirq);
690		opal_irqs[i] = irq;
691	}
692
693	/* Create "opal" kobject under /sys/firmware */
694	rc = opal_sysfs_init();
695	if (rc == 0) {
696		/* Setup dump region interface */
697		opal_dump_region_init();
698		/* Setup error log interface */
699		rc = opal_elog_init();
700		/* Setup code update interface */
701		opal_flash_init();
702		/* Setup platform dump extract interface */
703		opal_platform_dump_init();
704		/* Setup system parameters interface */
705		opal_sys_param_init();
706		/* Setup message log interface. */
707		opal_msglog_init();
708	}
709
710	return 0;
711}
712machine_subsys_initcall(powernv, opal_init);
713
714void opal_shutdown(void)
715{
716	unsigned int i;
717	long rc = OPAL_BUSY;
718
719	/* First free interrupts, which will also mask them */
720	for (i = 0; i < opal_irq_count; i++) {
721		if (opal_irqs[i])
722			free_irq(opal_irqs[i], NULL);
723		opal_irqs[i] = 0;
724	}
725
726	/*
727	 * Then sync with OPAL which ensure anything that can
728	 * potentially write to our memory has completed such
729	 * as an ongoing dump retrieval
730	 */
731	while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
732		rc = opal_sync_host_reboot();
733		if (rc == OPAL_BUSY)
734			opal_poll_events(NULL);
735		else
736			mdelay(10);
737	}
738
739	/* Unregister memory dump region */
740	opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
741}
742
743/* Export this so that test modules can use it */
744EXPORT_SYMBOL_GPL(opal_invalid_call);
745
746/* Convert a region of vmalloc memory to an opal sg list */
747struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
748					     unsigned long vmalloc_size)
749{
750	struct opal_sg_list *sg, *first = NULL;
751	unsigned long i = 0;
752
753	sg = kzalloc(PAGE_SIZE, GFP_KERNEL);
754	if (!sg)
755		goto nomem;
756
757	first = sg;
758
759	while (vmalloc_size > 0) {
760		uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT;
761		uint64_t length = min(vmalloc_size, PAGE_SIZE);
762
763		sg->entry[i].data = cpu_to_be64(data);
764		sg->entry[i].length = cpu_to_be64(length);
765		i++;
766
767		if (i >= SG_ENTRIES_PER_NODE) {
768			struct opal_sg_list *next;
769
770			next = kzalloc(PAGE_SIZE, GFP_KERNEL);
771			if (!next)
772				goto nomem;
773
774			sg->length = cpu_to_be64(
775					i * sizeof(struct opal_sg_entry) + 16);
776			i = 0;
777			sg->next = cpu_to_be64(__pa(next));
778			sg = next;
779		}
780
781		vmalloc_addr += length;
782		vmalloc_size -= length;
783	}
784
785	sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16);
786
787	return first;
788
789nomem:
790	pr_err("%s : Failed to allocate memory\n", __func__);
791	opal_free_sg_list(first);
792	return NULL;
793}
794
795void opal_free_sg_list(struct opal_sg_list *sg)
796{
797	while (sg) {
798		uint64_t next = be64_to_cpu(sg->next);
799
800		kfree(sg);
801
802		if (next)
803			sg = __va(next);
804		else
805			sg = NULL;
806	}
807}
808