1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * SBI initialilization and all extension implementation.
4 *
5 * Copyright (c) 2020 Western Digital Corporation or its affiliates.
6 */
7
8 #include <linux/bits.h>
9 #include <linux/init.h>
10 #include <linux/pm.h>
11 #include <linux/reboot.h>
12 #include <asm/sbi.h>
13 #include <asm/smp.h>
14
15 /* default SBI version is 0.1 */
16 unsigned long sbi_spec_version __ro_after_init = SBI_SPEC_VERSION_DEFAULT;
17 EXPORT_SYMBOL(sbi_spec_version);
18
19 static void (*__sbi_set_timer)(uint64_t stime) __ro_after_init;
20 static void (*__sbi_send_ipi)(unsigned int cpu) __ro_after_init;
21 static int (*__sbi_rfence)(int fid, const struct cpumask *cpu_mask,
22 unsigned long start, unsigned long size,
23 unsigned long arg4, unsigned long arg5) __ro_after_init;
24
sbi_ecall(int ext,int fid,unsigned long arg0,unsigned long arg1,unsigned long arg2,unsigned long arg3,unsigned long arg4,unsigned long arg5)25 struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
26 unsigned long arg1, unsigned long arg2,
27 unsigned long arg3, unsigned long arg4,
28 unsigned long arg5)
29 {
30 struct sbiret ret;
31
32 register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);
33 register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);
34 register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);
35 register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3);
36 register uintptr_t a4 asm ("a4") = (uintptr_t)(arg4);
37 register uintptr_t a5 asm ("a5") = (uintptr_t)(arg5);
38 register uintptr_t a6 asm ("a6") = (uintptr_t)(fid);
39 register uintptr_t a7 asm ("a7") = (uintptr_t)(ext);
40 asm volatile ("ecall"
41 : "+r" (a0), "+r" (a1)
42 : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7)
43 : "memory");
44 ret.error = a0;
45 ret.value = a1;
46
47 return ret;
48 }
49 EXPORT_SYMBOL(sbi_ecall);
50
sbi_err_map_linux_errno(int err)51 int sbi_err_map_linux_errno(int err)
52 {
53 switch (err) {
54 case SBI_SUCCESS:
55 return 0;
56 case SBI_ERR_DENIED:
57 return -EPERM;
58 case SBI_ERR_INVALID_PARAM:
59 return -EINVAL;
60 case SBI_ERR_INVALID_ADDRESS:
61 return -EFAULT;
62 case SBI_ERR_NOT_SUPPORTED:
63 case SBI_ERR_FAILURE:
64 default:
65 return -ENOTSUPP;
66 };
67 }
68 EXPORT_SYMBOL(sbi_err_map_linux_errno);
69
70 #ifdef CONFIG_RISCV_SBI_V01
__sbi_v01_cpumask_to_hartmask(const struct cpumask * cpu_mask)71 static unsigned long __sbi_v01_cpumask_to_hartmask(const struct cpumask *cpu_mask)
72 {
73 unsigned long cpuid, hartid;
74 unsigned long hmask = 0;
75
76 /*
77 * There is no maximum hartid concept in RISC-V and NR_CPUS must not be
78 * associated with hartid. As SBI v0.1 is only kept for backward compatibility
79 * and will be removed in the future, there is no point in supporting hartid
80 * greater than BITS_PER_LONG (32 for RV32 and 64 for RV64). Ideally, SBI v0.2
81 * should be used for platforms with hartid greater than BITS_PER_LONG.
82 */
83 for_each_cpu(cpuid, cpu_mask) {
84 hartid = cpuid_to_hartid_map(cpuid);
85 if (hartid >= BITS_PER_LONG) {
86 pr_warn("Unable to send any request to hartid > BITS_PER_LONG for SBI v0.1\n");
87 break;
88 }
89 hmask |= BIT(hartid);
90 }
91
92 return hmask;
93 }
94
95 /**
96 * sbi_console_putchar() - Writes given character to the console device.
97 * @ch: The data to be written to the console.
98 *
99 * Return: None
100 */
sbi_console_putchar(int ch)101 void sbi_console_putchar(int ch)
102 {
103 sbi_ecall(SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, ch, 0, 0, 0, 0, 0);
104 }
105 EXPORT_SYMBOL(sbi_console_putchar);
106
107 /**
108 * sbi_console_getchar() - Reads a byte from console device.
109 *
110 * Returns the value read from console.
111 */
sbi_console_getchar(void)112 int sbi_console_getchar(void)
113 {
114 struct sbiret ret;
115
116 ret = sbi_ecall(SBI_EXT_0_1_CONSOLE_GETCHAR, 0, 0, 0, 0, 0, 0, 0);
117
118 return ret.error;
119 }
120 EXPORT_SYMBOL(sbi_console_getchar);
121
122 /**
123 * sbi_shutdown() - Remove all the harts from executing supervisor code.
124 *
125 * Return: None
126 */
sbi_shutdown(void)127 void sbi_shutdown(void)
128 {
129 sbi_ecall(SBI_EXT_0_1_SHUTDOWN, 0, 0, 0, 0, 0, 0, 0);
130 }
131 EXPORT_SYMBOL(sbi_shutdown);
132
133 /**
134 * __sbi_set_timer_v01() - Program the timer for next timer event.
135 * @stime_value: The value after which next timer event should fire.
136 *
137 * Return: None
138 */
__sbi_set_timer_v01(uint64_t stime_value)139 static void __sbi_set_timer_v01(uint64_t stime_value)
140 {
141 #if __riscv_xlen == 32
142 sbi_ecall(SBI_EXT_0_1_SET_TIMER, 0, stime_value,
143 stime_value >> 32, 0, 0, 0, 0);
144 #else
145 sbi_ecall(SBI_EXT_0_1_SET_TIMER, 0, stime_value, 0, 0, 0, 0, 0);
146 #endif
147 }
148
__sbi_send_ipi_v01(unsigned int cpu)149 static void __sbi_send_ipi_v01(unsigned int cpu)
150 {
151 unsigned long hart_mask =
152 __sbi_v01_cpumask_to_hartmask(cpumask_of(cpu));
153 sbi_ecall(SBI_EXT_0_1_SEND_IPI, 0, (unsigned long)(&hart_mask),
154 0, 0, 0, 0, 0);
155 }
156
__sbi_rfence_v01(int fid,const struct cpumask * cpu_mask,unsigned long start,unsigned long size,unsigned long arg4,unsigned long arg5)157 static int __sbi_rfence_v01(int fid, const struct cpumask *cpu_mask,
158 unsigned long start, unsigned long size,
159 unsigned long arg4, unsigned long arg5)
160 {
161 int result = 0;
162 unsigned long hart_mask;
163
164 if (!cpu_mask || cpumask_empty(cpu_mask))
165 cpu_mask = cpu_online_mask;
166 hart_mask = __sbi_v01_cpumask_to_hartmask(cpu_mask);
167
168 /* v0.2 function IDs are equivalent to v0.1 extension IDs */
169 switch (fid) {
170 case SBI_EXT_RFENCE_REMOTE_FENCE_I:
171 sbi_ecall(SBI_EXT_0_1_REMOTE_FENCE_I, 0,
172 (unsigned long)&hart_mask, 0, 0, 0, 0, 0);
173 break;
174 case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA:
175 sbi_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA, 0,
176 (unsigned long)&hart_mask, start, size,
177 0, 0, 0);
178 break;
179 case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID:
180 sbi_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, 0,
181 (unsigned long)&hart_mask, start, size,
182 arg4, 0, 0);
183 break;
184 default:
185 pr_err("SBI call [%d]not supported in SBI v0.1\n", fid);
186 result = -EINVAL;
187 }
188
189 return result;
190 }
191
sbi_set_power_off(void)192 static void sbi_set_power_off(void)
193 {
194 pm_power_off = sbi_shutdown;
195 }
196 #else
__sbi_set_timer_v01(uint64_t stime_value)197 static void __sbi_set_timer_v01(uint64_t stime_value)
198 {
199 pr_warn("Timer extension is not available in SBI v%lu.%lu\n",
200 sbi_major_version(), sbi_minor_version());
201 }
202
__sbi_send_ipi_v01(unsigned int cpu)203 static void __sbi_send_ipi_v01(unsigned int cpu)
204 {
205 pr_warn("IPI extension is not available in SBI v%lu.%lu\n",
206 sbi_major_version(), sbi_minor_version());
207 }
208
__sbi_rfence_v01(int fid,const struct cpumask * cpu_mask,unsigned long start,unsigned long size,unsigned long arg4,unsigned long arg5)209 static int __sbi_rfence_v01(int fid, const struct cpumask *cpu_mask,
210 unsigned long start, unsigned long size,
211 unsigned long arg4, unsigned long arg5)
212 {
213 pr_warn("remote fence extension is not available in SBI v%lu.%lu\n",
214 sbi_major_version(), sbi_minor_version());
215
216 return 0;
217 }
218
sbi_set_power_off(void)219 static void sbi_set_power_off(void) {}
220 #endif /* CONFIG_RISCV_SBI_V01 */
221
__sbi_set_timer_v02(uint64_t stime_value)222 static void __sbi_set_timer_v02(uint64_t stime_value)
223 {
224 #if __riscv_xlen == 32
225 sbi_ecall(SBI_EXT_TIME, SBI_EXT_TIME_SET_TIMER, stime_value,
226 stime_value >> 32, 0, 0, 0, 0);
227 #else
228 sbi_ecall(SBI_EXT_TIME, SBI_EXT_TIME_SET_TIMER, stime_value, 0,
229 0, 0, 0, 0);
230 #endif
231 }
232
__sbi_send_ipi_v02(unsigned int cpu)233 static void __sbi_send_ipi_v02(unsigned int cpu)
234 {
235 int result;
236 struct sbiret ret = {0};
237
238 ret = sbi_ecall(SBI_EXT_IPI, SBI_EXT_IPI_SEND_IPI,
239 1UL, cpuid_to_hartid_map(cpu), 0, 0, 0, 0);
240 if (ret.error) {
241 result = sbi_err_map_linux_errno(ret.error);
242 pr_err("%s: hbase = [%lu] failed (error [%d])\n",
243 __func__, cpuid_to_hartid_map(cpu), result);
244 }
245 }
246
__sbi_rfence_v02_call(unsigned long fid,unsigned long hmask,unsigned long hbase,unsigned long start,unsigned long size,unsigned long arg4,unsigned long arg5)247 static int __sbi_rfence_v02_call(unsigned long fid, unsigned long hmask,
248 unsigned long hbase, unsigned long start,
249 unsigned long size, unsigned long arg4,
250 unsigned long arg5)
251 {
252 struct sbiret ret = {0};
253 int ext = SBI_EXT_RFENCE;
254 int result = 0;
255
256 switch (fid) {
257 case SBI_EXT_RFENCE_REMOTE_FENCE_I:
258 ret = sbi_ecall(ext, fid, hmask, hbase, 0, 0, 0, 0);
259 break;
260 case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA:
261 ret = sbi_ecall(ext, fid, hmask, hbase, start,
262 size, 0, 0);
263 break;
264 case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID:
265 ret = sbi_ecall(ext, fid, hmask, hbase, start,
266 size, arg4, 0);
267 break;
268
269 case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA:
270 ret = sbi_ecall(ext, fid, hmask, hbase, start,
271 size, 0, 0);
272 break;
273 case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID:
274 ret = sbi_ecall(ext, fid, hmask, hbase, start,
275 size, arg4, 0);
276 break;
277 case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA:
278 ret = sbi_ecall(ext, fid, hmask, hbase, start,
279 size, 0, 0);
280 break;
281 case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID:
282 ret = sbi_ecall(ext, fid, hmask, hbase, start,
283 size, arg4, 0);
284 break;
285 default:
286 pr_err("unknown function ID [%lu] for SBI extension [%d]\n",
287 fid, ext);
288 result = -EINVAL;
289 }
290
291 if (ret.error) {
292 result = sbi_err_map_linux_errno(ret.error);
293 pr_err("%s: hbase = [%lu] hmask = [0x%lx] failed (error [%d])\n",
294 __func__, hbase, hmask, result);
295 }
296
297 return result;
298 }
299
__sbi_rfence_v02(int fid,const struct cpumask * cpu_mask,unsigned long start,unsigned long size,unsigned long arg4,unsigned long arg5)300 static int __sbi_rfence_v02(int fid, const struct cpumask *cpu_mask,
301 unsigned long start, unsigned long size,
302 unsigned long arg4, unsigned long arg5)
303 {
304 unsigned long hartid, cpuid, hmask = 0, hbase = 0, htop = 0;
305 int result;
306
307 if (!cpu_mask || cpumask_empty(cpu_mask))
308 cpu_mask = cpu_online_mask;
309
310 for_each_cpu(cpuid, cpu_mask) {
311 hartid = cpuid_to_hartid_map(cpuid);
312 if (hmask) {
313 if (hartid + BITS_PER_LONG <= htop ||
314 hbase + BITS_PER_LONG <= hartid) {
315 result = __sbi_rfence_v02_call(fid, hmask,
316 hbase, start, size, arg4, arg5);
317 if (result)
318 return result;
319 hmask = 0;
320 } else if (hartid < hbase) {
321 /* shift the mask to fit lower hartid */
322 hmask <<= hbase - hartid;
323 hbase = hartid;
324 }
325 }
326 if (!hmask) {
327 hbase = hartid;
328 htop = hartid;
329 } else if (hartid > htop) {
330 htop = hartid;
331 }
332 hmask |= BIT(hartid - hbase);
333 }
334
335 if (hmask) {
336 result = __sbi_rfence_v02_call(fid, hmask, hbase,
337 start, size, arg4, arg5);
338 if (result)
339 return result;
340 }
341
342 return 0;
343 }
344
345 /**
346 * sbi_set_timer() - Program the timer for next timer event.
347 * @stime_value: The value after which next timer event should fire.
348 *
349 * Return: None.
350 */
sbi_set_timer(uint64_t stime_value)351 void sbi_set_timer(uint64_t stime_value)
352 {
353 __sbi_set_timer(stime_value);
354 }
355
356 /**
357 * sbi_send_ipi() - Send an IPI to any hart.
358 * @cpu: Logical id of the target CPU.
359 */
sbi_send_ipi(unsigned int cpu)360 void sbi_send_ipi(unsigned int cpu)
361 {
362 __sbi_send_ipi(cpu);
363 }
364 EXPORT_SYMBOL(sbi_send_ipi);
365
366 /**
367 * sbi_remote_fence_i() - Execute FENCE.I instruction on given remote harts.
368 * @cpu_mask: A cpu mask containing all the target harts.
369 *
370 * Return: 0 on success, appropriate linux error code otherwise.
371 */
sbi_remote_fence_i(const struct cpumask * cpu_mask)372 int sbi_remote_fence_i(const struct cpumask *cpu_mask)
373 {
374 return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_FENCE_I,
375 cpu_mask, 0, 0, 0, 0);
376 }
377 EXPORT_SYMBOL(sbi_remote_fence_i);
378
379 /**
380 * sbi_remote_sfence_vma() - Execute SFENCE.VMA instructions on given remote
381 * harts for the specified virtual address range.
382 * @cpu_mask: A cpu mask containing all the target harts.
383 * @start: Start of the virtual address
384 * @size: Total size of the virtual address range.
385 *
386 * Return: 0 on success, appropriate linux error code otherwise.
387 */
sbi_remote_sfence_vma(const struct cpumask * cpu_mask,unsigned long start,unsigned long size)388 int sbi_remote_sfence_vma(const struct cpumask *cpu_mask,
389 unsigned long start,
390 unsigned long size)
391 {
392 return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA,
393 cpu_mask, start, size, 0, 0);
394 }
395 EXPORT_SYMBOL(sbi_remote_sfence_vma);
396
397 /**
398 * sbi_remote_sfence_vma_asid() - Execute SFENCE.VMA instructions on given
399 * remote harts for a virtual address range belonging to a specific ASID.
400 *
401 * @cpu_mask: A cpu mask containing all the target harts.
402 * @start: Start of the virtual address
403 * @size: Total size of the virtual address range.
404 * @asid: The value of address space identifier (ASID).
405 *
406 * Return: 0 on success, appropriate linux error code otherwise.
407 */
sbi_remote_sfence_vma_asid(const struct cpumask * cpu_mask,unsigned long start,unsigned long size,unsigned long asid)408 int sbi_remote_sfence_vma_asid(const struct cpumask *cpu_mask,
409 unsigned long start,
410 unsigned long size,
411 unsigned long asid)
412 {
413 return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID,
414 cpu_mask, start, size, asid, 0);
415 }
416 EXPORT_SYMBOL(sbi_remote_sfence_vma_asid);
417
418 /**
419 * sbi_remote_hfence_gvma() - Execute HFENCE.GVMA instructions on given remote
420 * harts for the specified guest physical address range.
421 * @cpu_mask: A cpu mask containing all the target harts.
422 * @start: Start of the guest physical address
423 * @size: Total size of the guest physical address range.
424 *
425 * Return: None
426 */
sbi_remote_hfence_gvma(const struct cpumask * cpu_mask,unsigned long start,unsigned long size)427 int sbi_remote_hfence_gvma(const struct cpumask *cpu_mask,
428 unsigned long start,
429 unsigned long size)
430 {
431 return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA,
432 cpu_mask, start, size, 0, 0);
433 }
434 EXPORT_SYMBOL_GPL(sbi_remote_hfence_gvma);
435
436 /**
437 * sbi_remote_hfence_gvma_vmid() - Execute HFENCE.GVMA instructions on given
438 * remote harts for a guest physical address range belonging to a specific VMID.
439 *
440 * @cpu_mask: A cpu mask containing all the target harts.
441 * @start: Start of the guest physical address
442 * @size: Total size of the guest physical address range.
443 * @vmid: The value of guest ID (VMID).
444 *
445 * Return: 0 if success, Error otherwise.
446 */
sbi_remote_hfence_gvma_vmid(const struct cpumask * cpu_mask,unsigned long start,unsigned long size,unsigned long vmid)447 int sbi_remote_hfence_gvma_vmid(const struct cpumask *cpu_mask,
448 unsigned long start,
449 unsigned long size,
450 unsigned long vmid)
451 {
452 return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID,
453 cpu_mask, start, size, vmid, 0);
454 }
455 EXPORT_SYMBOL(sbi_remote_hfence_gvma_vmid);
456
457 /**
458 * sbi_remote_hfence_vvma() - Execute HFENCE.VVMA instructions on given remote
459 * harts for the current guest virtual address range.
460 * @cpu_mask: A cpu mask containing all the target harts.
461 * @start: Start of the current guest virtual address
462 * @size: Total size of the current guest virtual address range.
463 *
464 * Return: None
465 */
sbi_remote_hfence_vvma(const struct cpumask * cpu_mask,unsigned long start,unsigned long size)466 int sbi_remote_hfence_vvma(const struct cpumask *cpu_mask,
467 unsigned long start,
468 unsigned long size)
469 {
470 return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA,
471 cpu_mask, start, size, 0, 0);
472 }
473 EXPORT_SYMBOL(sbi_remote_hfence_vvma);
474
475 /**
476 * sbi_remote_hfence_vvma_asid() - Execute HFENCE.VVMA instructions on given
477 * remote harts for current guest virtual address range belonging to a specific
478 * ASID.
479 *
480 * @cpu_mask: A cpu mask containing all the target harts.
481 * @start: Start of the current guest virtual address
482 * @size: Total size of the current guest virtual address range.
483 * @asid: The value of address space identifier (ASID).
484 *
485 * Return: None
486 */
sbi_remote_hfence_vvma_asid(const struct cpumask * cpu_mask,unsigned long start,unsigned long size,unsigned long asid)487 int sbi_remote_hfence_vvma_asid(const struct cpumask *cpu_mask,
488 unsigned long start,
489 unsigned long size,
490 unsigned long asid)
491 {
492 return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID,
493 cpu_mask, start, size, asid, 0);
494 }
495 EXPORT_SYMBOL(sbi_remote_hfence_vvma_asid);
496
sbi_srst_reset(unsigned long type,unsigned long reason)497 static void sbi_srst_reset(unsigned long type, unsigned long reason)
498 {
499 sbi_ecall(SBI_EXT_SRST, SBI_EXT_SRST_RESET, type, reason,
500 0, 0, 0, 0);
501 pr_warn("%s: type=0x%lx reason=0x%lx failed\n",
502 __func__, type, reason);
503 }
504
sbi_srst_reboot(struct notifier_block * this,unsigned long mode,void * cmd)505 static int sbi_srst_reboot(struct notifier_block *this,
506 unsigned long mode, void *cmd)
507 {
508 sbi_srst_reset((mode == REBOOT_WARM || mode == REBOOT_SOFT) ?
509 SBI_SRST_RESET_TYPE_WARM_REBOOT :
510 SBI_SRST_RESET_TYPE_COLD_REBOOT,
511 SBI_SRST_RESET_REASON_NONE);
512 return NOTIFY_DONE;
513 }
514
515 static struct notifier_block sbi_srst_reboot_nb;
516
sbi_srst_power_off(void)517 static void sbi_srst_power_off(void)
518 {
519 sbi_srst_reset(SBI_SRST_RESET_TYPE_SHUTDOWN,
520 SBI_SRST_RESET_REASON_NONE);
521 }
522
523 /**
524 * sbi_probe_extension() - Check if an SBI extension ID is supported or not.
525 * @extid: The extension ID to be probed.
526 *
527 * Return: 1 or an extension specific nonzero value if yes, 0 otherwise.
528 */
sbi_probe_extension(int extid)529 long sbi_probe_extension(int extid)
530 {
531 struct sbiret ret;
532
533 ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, extid,
534 0, 0, 0, 0, 0);
535 if (!ret.error)
536 return ret.value;
537
538 return 0;
539 }
540 EXPORT_SYMBOL(sbi_probe_extension);
541
__sbi_base_ecall(int fid)542 static long __sbi_base_ecall(int fid)
543 {
544 struct sbiret ret;
545
546 ret = sbi_ecall(SBI_EXT_BASE, fid, 0, 0, 0, 0, 0, 0);
547 if (!ret.error)
548 return ret.value;
549 else
550 return sbi_err_map_linux_errno(ret.error);
551 }
552
sbi_get_spec_version(void)553 static inline long sbi_get_spec_version(void)
554 {
555 return __sbi_base_ecall(SBI_EXT_BASE_GET_SPEC_VERSION);
556 }
557
sbi_get_firmware_id(void)558 static inline long sbi_get_firmware_id(void)
559 {
560 return __sbi_base_ecall(SBI_EXT_BASE_GET_IMP_ID);
561 }
562
sbi_get_firmware_version(void)563 static inline long sbi_get_firmware_version(void)
564 {
565 return __sbi_base_ecall(SBI_EXT_BASE_GET_IMP_VERSION);
566 }
567
sbi_get_mvendorid(void)568 long sbi_get_mvendorid(void)
569 {
570 return __sbi_base_ecall(SBI_EXT_BASE_GET_MVENDORID);
571 }
572 EXPORT_SYMBOL_GPL(sbi_get_mvendorid);
573
sbi_get_marchid(void)574 long sbi_get_marchid(void)
575 {
576 return __sbi_base_ecall(SBI_EXT_BASE_GET_MARCHID);
577 }
578 EXPORT_SYMBOL_GPL(sbi_get_marchid);
579
sbi_get_mimpid(void)580 long sbi_get_mimpid(void)
581 {
582 return __sbi_base_ecall(SBI_EXT_BASE_GET_MIMPID);
583 }
584 EXPORT_SYMBOL_GPL(sbi_get_mimpid);
585
sbi_init(void)586 void __init sbi_init(void)
587 {
588 int ret;
589
590 sbi_set_power_off();
591 ret = sbi_get_spec_version();
592 if (ret > 0)
593 sbi_spec_version = ret;
594
595 pr_info("SBI specification v%lu.%lu detected\n",
596 sbi_major_version(), sbi_minor_version());
597
598 if (!sbi_spec_is_0_1()) {
599 pr_info("SBI implementation ID=0x%lx Version=0x%lx\n",
600 sbi_get_firmware_id(), sbi_get_firmware_version());
601 if (sbi_probe_extension(SBI_EXT_TIME)) {
602 __sbi_set_timer = __sbi_set_timer_v02;
603 pr_info("SBI TIME extension detected\n");
604 } else {
605 __sbi_set_timer = __sbi_set_timer_v01;
606 }
607 if (sbi_probe_extension(SBI_EXT_IPI)) {
608 __sbi_send_ipi = __sbi_send_ipi_v02;
609 pr_info("SBI IPI extension detected\n");
610 } else {
611 __sbi_send_ipi = __sbi_send_ipi_v01;
612 }
613 if (sbi_probe_extension(SBI_EXT_RFENCE)) {
614 __sbi_rfence = __sbi_rfence_v02;
615 pr_info("SBI RFENCE extension detected\n");
616 } else {
617 __sbi_rfence = __sbi_rfence_v01;
618 }
619 if ((sbi_spec_version >= sbi_mk_version(0, 3)) &&
620 sbi_probe_extension(SBI_EXT_SRST)) {
621 pr_info("SBI SRST extension detected\n");
622 pm_power_off = sbi_srst_power_off;
623 sbi_srst_reboot_nb.notifier_call = sbi_srst_reboot;
624 sbi_srst_reboot_nb.priority = 192;
625 register_restart_handler(&sbi_srst_reboot_nb);
626 }
627 } else {
628 __sbi_set_timer = __sbi_set_timer_v01;
629 __sbi_send_ipi = __sbi_send_ipi_v01;
630 __sbi_rfence = __sbi_rfence_v01;
631 }
632 }
633
