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libnvdimm, nfit: handle unarmed dimms, mark namespaces read-only
[deliverable/linux.git] / drivers / acpi / nfit.c
1 /*
2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 */
13 #include <linux/list_sort.h>
14 #include <linux/libnvdimm.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/ndctl.h>
18 #include <linux/list.h>
19 #include <linux/acpi.h>
20 #include <linux/sort.h>
21 #include <linux/io.h>
22 #include "nfit.h"
23
24 /*
25 * For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
26 * irrelevant.
27 */
28 #include <asm-generic/io-64-nonatomic-hi-lo.h>
29
30 static bool force_enable_dimms;
31 module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR);
32 MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
33
34 static u8 nfit_uuid[NFIT_UUID_MAX][16];
35
36 const u8 *to_nfit_uuid(enum nfit_uuids id)
37 {
38 return nfit_uuid[id];
39 }
40 EXPORT_SYMBOL(to_nfit_uuid);
41
42 static struct acpi_nfit_desc *to_acpi_nfit_desc(
43 struct nvdimm_bus_descriptor *nd_desc)
44 {
45 return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
46 }
47
48 static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc)
49 {
50 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
51
52 /*
53 * If provider == 'ACPI.NFIT' we can assume 'dev' is a struct
54 * acpi_device.
55 */
56 if (!nd_desc->provider_name
57 || strcmp(nd_desc->provider_name, "ACPI.NFIT") != 0)
58 return NULL;
59
60 return to_acpi_device(acpi_desc->dev);
61 }
62
63 static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
64 struct nvdimm *nvdimm, unsigned int cmd, void *buf,
65 unsigned int buf_len)
66 {
67 struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
68 const struct nd_cmd_desc *desc = NULL;
69 union acpi_object in_obj, in_buf, *out_obj;
70 struct device *dev = acpi_desc->dev;
71 const char *cmd_name, *dimm_name;
72 unsigned long dsm_mask;
73 acpi_handle handle;
74 const u8 *uuid;
75 u32 offset;
76 int rc, i;
77
78 if (nvdimm) {
79 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
80 struct acpi_device *adev = nfit_mem->adev;
81
82 if (!adev)
83 return -ENOTTY;
84 dimm_name = nvdimm_name(nvdimm);
85 cmd_name = nvdimm_cmd_name(cmd);
86 dsm_mask = nfit_mem->dsm_mask;
87 desc = nd_cmd_dimm_desc(cmd);
88 uuid = to_nfit_uuid(NFIT_DEV_DIMM);
89 handle = adev->handle;
90 } else {
91 struct acpi_device *adev = to_acpi_dev(acpi_desc);
92
93 cmd_name = nvdimm_bus_cmd_name(cmd);
94 dsm_mask = nd_desc->dsm_mask;
95 desc = nd_cmd_bus_desc(cmd);
96 uuid = to_nfit_uuid(NFIT_DEV_BUS);
97 handle = adev->handle;
98 dimm_name = "bus";
99 }
100
101 if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
102 return -ENOTTY;
103
104 if (!test_bit(cmd, &dsm_mask))
105 return -ENOTTY;
106
107 in_obj.type = ACPI_TYPE_PACKAGE;
108 in_obj.package.count = 1;
109 in_obj.package.elements = &in_buf;
110 in_buf.type = ACPI_TYPE_BUFFER;
111 in_buf.buffer.pointer = buf;
112 in_buf.buffer.length = 0;
113
114 /* libnvdimm has already validated the input envelope */
115 for (i = 0; i < desc->in_num; i++)
116 in_buf.buffer.length += nd_cmd_in_size(nvdimm, cmd, desc,
117 i, buf);
118
119 if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
120 dev_dbg(dev, "%s:%s cmd: %s input length: %d\n", __func__,
121 dimm_name, cmd_name, in_buf.buffer.length);
122 print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
123 4, in_buf.buffer.pointer, min_t(u32, 128,
124 in_buf.buffer.length), true);
125 }
126
127 out_obj = acpi_evaluate_dsm(handle, uuid, 1, cmd, &in_obj);
128 if (!out_obj) {
129 dev_dbg(dev, "%s:%s _DSM failed cmd: %s\n", __func__, dimm_name,
130 cmd_name);
131 return -EINVAL;
132 }
133
134 if (out_obj->package.type != ACPI_TYPE_BUFFER) {
135 dev_dbg(dev, "%s:%s unexpected output object type cmd: %s type: %d\n",
136 __func__, dimm_name, cmd_name, out_obj->type);
137 rc = -EINVAL;
138 goto out;
139 }
140
141 if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
142 dev_dbg(dev, "%s:%s cmd: %s output length: %d\n", __func__,
143 dimm_name, cmd_name, out_obj->buffer.length);
144 print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
145 4, out_obj->buffer.pointer, min_t(u32, 128,
146 out_obj->buffer.length), true);
147 }
148
149 for (i = 0, offset = 0; i < desc->out_num; i++) {
150 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf,
151 (u32 *) out_obj->buffer.pointer);
152
153 if (offset + out_size > out_obj->buffer.length) {
154 dev_dbg(dev, "%s:%s output object underflow cmd: %s field: %d\n",
155 __func__, dimm_name, cmd_name, i);
156 break;
157 }
158
159 if (in_buf.buffer.length + offset + out_size > buf_len) {
160 dev_dbg(dev, "%s:%s output overrun cmd: %s field: %d\n",
161 __func__, dimm_name, cmd_name, i);
162 rc = -ENXIO;
163 goto out;
164 }
165 memcpy(buf + in_buf.buffer.length + offset,
166 out_obj->buffer.pointer + offset, out_size);
167 offset += out_size;
168 }
169 if (offset + in_buf.buffer.length < buf_len) {
170 if (i >= 1) {
171 /*
172 * status valid, return the number of bytes left
173 * unfilled in the output buffer
174 */
175 rc = buf_len - offset - in_buf.buffer.length;
176 } else {
177 dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
178 __func__, dimm_name, cmd_name, buf_len,
179 offset);
180 rc = -ENXIO;
181 }
182 } else
183 rc = 0;
184
185 out:
186 ACPI_FREE(out_obj);
187
188 return rc;
189 }
190
191 static const char *spa_type_name(u16 type)
192 {
193 static const char *to_name[] = {
194 [NFIT_SPA_VOLATILE] = "volatile",
195 [NFIT_SPA_PM] = "pmem",
196 [NFIT_SPA_DCR] = "dimm-control-region",
197 [NFIT_SPA_BDW] = "block-data-window",
198 [NFIT_SPA_VDISK] = "volatile-disk",
199 [NFIT_SPA_VCD] = "volatile-cd",
200 [NFIT_SPA_PDISK] = "persistent-disk",
201 [NFIT_SPA_PCD] = "persistent-cd",
202
203 };
204
205 if (type > NFIT_SPA_PCD)
206 return "unknown";
207
208 return to_name[type];
209 }
210
211 static int nfit_spa_type(struct acpi_nfit_system_address *spa)
212 {
213 int i;
214
215 for (i = 0; i < NFIT_UUID_MAX; i++)
216 if (memcmp(to_nfit_uuid(i), spa->range_guid, 16) == 0)
217 return i;
218 return -1;
219 }
220
221 static bool add_spa(struct acpi_nfit_desc *acpi_desc,
222 struct acpi_nfit_system_address *spa)
223 {
224 struct device *dev = acpi_desc->dev;
225 struct nfit_spa *nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa),
226 GFP_KERNEL);
227
228 if (!nfit_spa)
229 return false;
230 INIT_LIST_HEAD(&nfit_spa->list);
231 nfit_spa->spa = spa;
232 list_add_tail(&nfit_spa->list, &acpi_desc->spas);
233 dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
234 spa->range_index,
235 spa_type_name(nfit_spa_type(spa)));
236 return true;
237 }
238
239 static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
240 struct acpi_nfit_memory_map *memdev)
241 {
242 struct device *dev = acpi_desc->dev;
243 struct nfit_memdev *nfit_memdev = devm_kzalloc(dev,
244 sizeof(*nfit_memdev), GFP_KERNEL);
245
246 if (!nfit_memdev)
247 return false;
248 INIT_LIST_HEAD(&nfit_memdev->list);
249 nfit_memdev->memdev = memdev;
250 list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
251 dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d\n",
252 __func__, memdev->device_handle, memdev->range_index,
253 memdev->region_index);
254 return true;
255 }
256
257 static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
258 struct acpi_nfit_control_region *dcr)
259 {
260 struct device *dev = acpi_desc->dev;
261 struct nfit_dcr *nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr),
262 GFP_KERNEL);
263
264 if (!nfit_dcr)
265 return false;
266 INIT_LIST_HEAD(&nfit_dcr->list);
267 nfit_dcr->dcr = dcr;
268 list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
269 dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__,
270 dcr->region_index, dcr->windows);
271 return true;
272 }
273
274 static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
275 struct acpi_nfit_data_region *bdw)
276 {
277 struct device *dev = acpi_desc->dev;
278 struct nfit_bdw *nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw),
279 GFP_KERNEL);
280
281 if (!nfit_bdw)
282 return false;
283 INIT_LIST_HEAD(&nfit_bdw->list);
284 nfit_bdw->bdw = bdw;
285 list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
286 dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__,
287 bdw->region_index, bdw->windows);
288 return true;
289 }
290
291 static bool add_idt(struct acpi_nfit_desc *acpi_desc,
292 struct acpi_nfit_interleave *idt)
293 {
294 struct device *dev = acpi_desc->dev;
295 struct nfit_idt *nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt),
296 GFP_KERNEL);
297
298 if (!nfit_idt)
299 return false;
300 INIT_LIST_HEAD(&nfit_idt->list);
301 nfit_idt->idt = idt;
302 list_add_tail(&nfit_idt->list, &acpi_desc->idts);
303 dev_dbg(dev, "%s: idt index: %d num_lines: %d\n", __func__,
304 idt->interleave_index, idt->line_count);
305 return true;
306 }
307
308 static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table,
309 const void *end)
310 {
311 struct device *dev = acpi_desc->dev;
312 struct acpi_nfit_header *hdr;
313 void *err = ERR_PTR(-ENOMEM);
314
315 if (table >= end)
316 return NULL;
317
318 hdr = table;
319 switch (hdr->type) {
320 case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
321 if (!add_spa(acpi_desc, table))
322 return err;
323 break;
324 case ACPI_NFIT_TYPE_MEMORY_MAP:
325 if (!add_memdev(acpi_desc, table))
326 return err;
327 break;
328 case ACPI_NFIT_TYPE_CONTROL_REGION:
329 if (!add_dcr(acpi_desc, table))
330 return err;
331 break;
332 case ACPI_NFIT_TYPE_DATA_REGION:
333 if (!add_bdw(acpi_desc, table))
334 return err;
335 break;
336 case ACPI_NFIT_TYPE_INTERLEAVE:
337 if (!add_idt(acpi_desc, table))
338 return err;
339 break;
340 case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
341 dev_dbg(dev, "%s: flush\n", __func__);
342 break;
343 case ACPI_NFIT_TYPE_SMBIOS:
344 dev_dbg(dev, "%s: smbios\n", __func__);
345 break;
346 default:
347 dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
348 break;
349 }
350
351 return table + hdr->length;
352 }
353
354 static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
355 struct nfit_mem *nfit_mem)
356 {
357 u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
358 u16 dcr = nfit_mem->dcr->region_index;
359 struct nfit_spa *nfit_spa;
360
361 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
362 u16 range_index = nfit_spa->spa->range_index;
363 int type = nfit_spa_type(nfit_spa->spa);
364 struct nfit_memdev *nfit_memdev;
365
366 if (type != NFIT_SPA_BDW)
367 continue;
368
369 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
370 if (nfit_memdev->memdev->range_index != range_index)
371 continue;
372 if (nfit_memdev->memdev->device_handle != device_handle)
373 continue;
374 if (nfit_memdev->memdev->region_index != dcr)
375 continue;
376
377 nfit_mem->spa_bdw = nfit_spa->spa;
378 return;
379 }
380 }
381
382 dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
383 nfit_mem->spa_dcr->range_index);
384 nfit_mem->bdw = NULL;
385 }
386
387 static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
388 struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
389 {
390 u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
391 struct nfit_memdev *nfit_memdev;
392 struct nfit_dcr *nfit_dcr;
393 struct nfit_bdw *nfit_bdw;
394 struct nfit_idt *nfit_idt;
395 u16 idt_idx, range_index;
396
397 list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
398 if (nfit_dcr->dcr->region_index != dcr)
399 continue;
400 nfit_mem->dcr = nfit_dcr->dcr;
401 break;
402 }
403
404 if (!nfit_mem->dcr) {
405 dev_dbg(acpi_desc->dev, "SPA %d missing:%s%s\n",
406 spa->range_index, __to_nfit_memdev(nfit_mem)
407 ? "" : " MEMDEV", nfit_mem->dcr ? "" : " DCR");
408 return -ENODEV;
409 }
410
411 /*
412 * We've found enough to create an nvdimm, optionally
413 * find an associated BDW
414 */
415 list_add(&nfit_mem->list, &acpi_desc->dimms);
416
417 list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
418 if (nfit_bdw->bdw->region_index != dcr)
419 continue;
420 nfit_mem->bdw = nfit_bdw->bdw;
421 break;
422 }
423
424 if (!nfit_mem->bdw)
425 return 0;
426
427 nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
428
429 if (!nfit_mem->spa_bdw)
430 return 0;
431
432 range_index = nfit_mem->spa_bdw->range_index;
433 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
434 if (nfit_memdev->memdev->range_index != range_index ||
435 nfit_memdev->memdev->region_index != dcr)
436 continue;
437 nfit_mem->memdev_bdw = nfit_memdev->memdev;
438 idt_idx = nfit_memdev->memdev->interleave_index;
439 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
440 if (nfit_idt->idt->interleave_index != idt_idx)
441 continue;
442 nfit_mem->idt_bdw = nfit_idt->idt;
443 break;
444 }
445 break;
446 }
447
448 return 0;
449 }
450
451 static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
452 struct acpi_nfit_system_address *spa)
453 {
454 struct nfit_mem *nfit_mem, *found;
455 struct nfit_memdev *nfit_memdev;
456 int type = nfit_spa_type(spa);
457 u16 dcr;
458
459 switch (type) {
460 case NFIT_SPA_DCR:
461 case NFIT_SPA_PM:
462 break;
463 default:
464 return 0;
465 }
466
467 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
468 int rc;
469
470 if (nfit_memdev->memdev->range_index != spa->range_index)
471 continue;
472 found = NULL;
473 dcr = nfit_memdev->memdev->region_index;
474 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
475 if (__to_nfit_memdev(nfit_mem)->region_index == dcr) {
476 found = nfit_mem;
477 break;
478 }
479
480 if (found)
481 nfit_mem = found;
482 else {
483 nfit_mem = devm_kzalloc(acpi_desc->dev,
484 sizeof(*nfit_mem), GFP_KERNEL);
485 if (!nfit_mem)
486 return -ENOMEM;
487 INIT_LIST_HEAD(&nfit_mem->list);
488 }
489
490 if (type == NFIT_SPA_DCR) {
491 struct nfit_idt *nfit_idt;
492 u16 idt_idx;
493
494 /* multiple dimms may share a SPA when interleaved */
495 nfit_mem->spa_dcr = spa;
496 nfit_mem->memdev_dcr = nfit_memdev->memdev;
497 idt_idx = nfit_memdev->memdev->interleave_index;
498 list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
499 if (nfit_idt->idt->interleave_index != idt_idx)
500 continue;
501 nfit_mem->idt_dcr = nfit_idt->idt;
502 break;
503 }
504 } else {
505 /*
506 * A single dimm may belong to multiple SPA-PM
507 * ranges, record at least one in addition to
508 * any SPA-DCR range.
509 */
510 nfit_mem->memdev_pmem = nfit_memdev->memdev;
511 }
512
513 if (found)
514 continue;
515
516 rc = nfit_mem_add(acpi_desc, nfit_mem, spa);
517 if (rc)
518 return rc;
519 }
520
521 return 0;
522 }
523
524 static int nfit_mem_cmp(void *priv, struct list_head *_a, struct list_head *_b)
525 {
526 struct nfit_mem *a = container_of(_a, typeof(*a), list);
527 struct nfit_mem *b = container_of(_b, typeof(*b), list);
528 u32 handleA, handleB;
529
530 handleA = __to_nfit_memdev(a)->device_handle;
531 handleB = __to_nfit_memdev(b)->device_handle;
532 if (handleA < handleB)
533 return -1;
534 else if (handleA > handleB)
535 return 1;
536 return 0;
537 }
538
539 static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
540 {
541 struct nfit_spa *nfit_spa;
542
543 /*
544 * For each SPA-DCR or SPA-PMEM address range find its
545 * corresponding MEMDEV(s). From each MEMDEV find the
546 * corresponding DCR. Then, if we're operating on a SPA-DCR,
547 * try to find a SPA-BDW and a corresponding BDW that references
548 * the DCR. Throw it all into an nfit_mem object. Note, that
549 * BDWs are optional.
550 */
551 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
552 int rc;
553
554 rc = nfit_mem_dcr_init(acpi_desc, nfit_spa->spa);
555 if (rc)
556 return rc;
557 }
558
559 list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
560
561 return 0;
562 }
563
564 static ssize_t revision_show(struct device *dev,
565 struct device_attribute *attr, char *buf)
566 {
567 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
568 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
569 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
570
571 return sprintf(buf, "%d\n", acpi_desc->nfit->header.revision);
572 }
573 static DEVICE_ATTR_RO(revision);
574
575 static struct attribute *acpi_nfit_attributes[] = {
576 &dev_attr_revision.attr,
577 NULL,
578 };
579
580 static struct attribute_group acpi_nfit_attribute_group = {
581 .name = "nfit",
582 .attrs = acpi_nfit_attributes,
583 };
584
585 const struct attribute_group *acpi_nfit_attribute_groups[] = {
586 &nvdimm_bus_attribute_group,
587 &acpi_nfit_attribute_group,
588 NULL,
589 };
590 EXPORT_SYMBOL_GPL(acpi_nfit_attribute_groups);
591
592 static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
593 {
594 struct nvdimm *nvdimm = to_nvdimm(dev);
595 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
596
597 return __to_nfit_memdev(nfit_mem);
598 }
599
600 static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
601 {
602 struct nvdimm *nvdimm = to_nvdimm(dev);
603 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
604
605 return nfit_mem->dcr;
606 }
607
608 static ssize_t handle_show(struct device *dev,
609 struct device_attribute *attr, char *buf)
610 {
611 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
612
613 return sprintf(buf, "%#x\n", memdev->device_handle);
614 }
615 static DEVICE_ATTR_RO(handle);
616
617 static ssize_t phys_id_show(struct device *dev,
618 struct device_attribute *attr, char *buf)
619 {
620 struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
621
622 return sprintf(buf, "%#x\n", memdev->physical_id);
623 }
624 static DEVICE_ATTR_RO(phys_id);
625
626 static ssize_t vendor_show(struct device *dev,
627 struct device_attribute *attr, char *buf)
628 {
629 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
630
631 return sprintf(buf, "%#x\n", dcr->vendor_id);
632 }
633 static DEVICE_ATTR_RO(vendor);
634
635 static ssize_t rev_id_show(struct device *dev,
636 struct device_attribute *attr, char *buf)
637 {
638 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
639
640 return sprintf(buf, "%#x\n", dcr->revision_id);
641 }
642 static DEVICE_ATTR_RO(rev_id);
643
644 static ssize_t device_show(struct device *dev,
645 struct device_attribute *attr, char *buf)
646 {
647 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
648
649 return sprintf(buf, "%#x\n", dcr->device_id);
650 }
651 static DEVICE_ATTR_RO(device);
652
653 static ssize_t format_show(struct device *dev,
654 struct device_attribute *attr, char *buf)
655 {
656 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
657
658 return sprintf(buf, "%#x\n", dcr->code);
659 }
660 static DEVICE_ATTR_RO(format);
661
662 static ssize_t serial_show(struct device *dev,
663 struct device_attribute *attr, char *buf)
664 {
665 struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
666
667 return sprintf(buf, "%#x\n", dcr->serial_number);
668 }
669 static DEVICE_ATTR_RO(serial);
670
671 static ssize_t flags_show(struct device *dev,
672 struct device_attribute *attr, char *buf)
673 {
674 u16 flags = to_nfit_memdev(dev)->flags;
675
676 return sprintf(buf, "%s%s%s%s%s\n",
677 flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save " : "",
678 flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore " : "",
679 flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush " : "",
680 flags & ACPI_NFIT_MEM_ARMED ? "arm " : "",
681 flags & ACPI_NFIT_MEM_HEALTH_OBSERVED ? "smart " : "");
682 }
683 static DEVICE_ATTR_RO(flags);
684
685 static struct attribute *acpi_nfit_dimm_attributes[] = {
686 &dev_attr_handle.attr,
687 &dev_attr_phys_id.attr,
688 &dev_attr_vendor.attr,
689 &dev_attr_device.attr,
690 &dev_attr_format.attr,
691 &dev_attr_serial.attr,
692 &dev_attr_rev_id.attr,
693 &dev_attr_flags.attr,
694 NULL,
695 };
696
697 static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,
698 struct attribute *a, int n)
699 {
700 struct device *dev = container_of(kobj, struct device, kobj);
701
702 if (to_nfit_dcr(dev))
703 return a->mode;
704 else
705 return 0;
706 }
707
708 static struct attribute_group acpi_nfit_dimm_attribute_group = {
709 .name = "nfit",
710 .attrs = acpi_nfit_dimm_attributes,
711 .is_visible = acpi_nfit_dimm_attr_visible,
712 };
713
714 static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
715 &nvdimm_attribute_group,
716 &nd_device_attribute_group,
717 &acpi_nfit_dimm_attribute_group,
718 NULL,
719 };
720
721 static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
722 u32 device_handle)
723 {
724 struct nfit_mem *nfit_mem;
725
726 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
727 if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)
728 return nfit_mem->nvdimm;
729
730 return NULL;
731 }
732
733 static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
734 struct nfit_mem *nfit_mem, u32 device_handle)
735 {
736 struct acpi_device *adev, *adev_dimm;
737 struct device *dev = acpi_desc->dev;
738 const u8 *uuid = to_nfit_uuid(NFIT_DEV_DIMM);
739 unsigned long long sta;
740 int i, rc = -ENODEV;
741 acpi_status status;
742
743 nfit_mem->dsm_mask = acpi_desc->dimm_dsm_force_en;
744 adev = to_acpi_dev(acpi_desc);
745 if (!adev)
746 return 0;
747
748 adev_dimm = acpi_find_child_device(adev, device_handle, false);
749 nfit_mem->adev = adev_dimm;
750 if (!adev_dimm) {
751 dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
752 device_handle);
753 return force_enable_dimms ? 0 : -ENODEV;
754 }
755
756 status = acpi_evaluate_integer(adev_dimm->handle, "_STA", NULL, &sta);
757 if (status == AE_NOT_FOUND) {
758 dev_dbg(dev, "%s missing _STA, assuming enabled...\n",
759 dev_name(&adev_dimm->dev));
760 rc = 0;
761 } else if (ACPI_FAILURE(status))
762 dev_err(dev, "%s failed to retrieve_STA, disabling...\n",
763 dev_name(&adev_dimm->dev));
764 else if ((sta & ACPI_STA_DEVICE_ENABLED) == 0)
765 dev_info(dev, "%s disabled by firmware\n",
766 dev_name(&adev_dimm->dev));
767 else
768 rc = 0;
769
770 for (i = ND_CMD_SMART; i <= ND_CMD_VENDOR; i++)
771 if (acpi_check_dsm(adev_dimm->handle, uuid, 1, 1ULL << i))
772 set_bit(i, &nfit_mem->dsm_mask);
773
774 return force_enable_dimms ? 0 : rc;
775 }
776
777 static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
778 {
779 struct nfit_mem *nfit_mem;
780 int dimm_count = 0;
781
782 list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
783 struct nvdimm *nvdimm;
784 unsigned long flags = 0;
785 u32 device_handle;
786 u16 mem_flags;
787 int rc;
788
789 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
790 nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
791 if (nvdimm) {
792 /*
793 * If for some reason we find multiple DCRs the
794 * first one wins
795 */
796 dev_err(acpi_desc->dev, "duplicate DCR detected: %s\n",
797 nvdimm_name(nvdimm));
798 continue;
799 }
800
801 if (nfit_mem->bdw && nfit_mem->memdev_pmem)
802 flags |= NDD_ALIASING;
803
804 mem_flags = __to_nfit_memdev(nfit_mem)->flags;
805 if (mem_flags & ACPI_NFIT_MEM_ARMED)
806 flags |= NDD_UNARMED;
807
808 rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
809 if (rc)
810 continue;
811
812 nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
813 acpi_nfit_dimm_attribute_groups,
814 flags, &nfit_mem->dsm_mask);
815 if (!nvdimm)
816 return -ENOMEM;
817
818 nfit_mem->nvdimm = nvdimm;
819 dimm_count++;
820
821 if ((mem_flags & ACPI_NFIT_MEM_FAILED_MASK) == 0)
822 continue;
823
824 dev_info(acpi_desc->dev, "%s: failed: %s%s%s%s\n",
825 nvdimm_name(nvdimm),
826 mem_flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save " : "",
827 mem_flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore " : "",
828 mem_flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush " : "",
829 mem_flags & ACPI_NFIT_MEM_ARMED ? "arm " : "");
830
831 }
832
833 return nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
834 }
835
836 static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
837 {
838 struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
839 const u8 *uuid = to_nfit_uuid(NFIT_DEV_BUS);
840 struct acpi_device *adev;
841 int i;
842
843 adev = to_acpi_dev(acpi_desc);
844 if (!adev)
845 return;
846
847 for (i = ND_CMD_ARS_CAP; i <= ND_CMD_ARS_STATUS; i++)
848 if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
849 set_bit(i, &nd_desc->dsm_mask);
850 }
851
852 static ssize_t range_index_show(struct device *dev,
853 struct device_attribute *attr, char *buf)
854 {
855 struct nd_region *nd_region = to_nd_region(dev);
856 struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
857
858 return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
859 }
860 static DEVICE_ATTR_RO(range_index);
861
862 static struct attribute *acpi_nfit_region_attributes[] = {
863 &dev_attr_range_index.attr,
864 NULL,
865 };
866
867 static struct attribute_group acpi_nfit_region_attribute_group = {
868 .name = "nfit",
869 .attrs = acpi_nfit_region_attributes,
870 };
871
872 static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
873 &nd_region_attribute_group,
874 &nd_mapping_attribute_group,
875 &nd_device_attribute_group,
876 &acpi_nfit_region_attribute_group,
877 NULL,
878 };
879
880 /* enough info to uniquely specify an interleave set */
881 struct nfit_set_info {
882 struct nfit_set_info_map {
883 u64 region_offset;
884 u32 serial_number;
885 u32 pad;
886 } mapping[0];
887 };
888
889 static size_t sizeof_nfit_set_info(int num_mappings)
890 {
891 return sizeof(struct nfit_set_info)
892 + num_mappings * sizeof(struct nfit_set_info_map);
893 }
894
895 static int cmp_map(const void *m0, const void *m1)
896 {
897 const struct nfit_set_info_map *map0 = m0;
898 const struct nfit_set_info_map *map1 = m1;
899
900 return memcmp(&map0->region_offset, &map1->region_offset,
901 sizeof(u64));
902 }
903
904 /* Retrieve the nth entry referencing this spa */
905 static struct acpi_nfit_memory_map *memdev_from_spa(
906 struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
907 {
908 struct nfit_memdev *nfit_memdev;
909
910 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
911 if (nfit_memdev->memdev->range_index == range_index)
912 if (n-- == 0)
913 return nfit_memdev->memdev;
914 return NULL;
915 }
916
917 static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
918 struct nd_region_desc *ndr_desc,
919 struct acpi_nfit_system_address *spa)
920 {
921 int i, spa_type = nfit_spa_type(spa);
922 struct device *dev = acpi_desc->dev;
923 struct nd_interleave_set *nd_set;
924 u16 nr = ndr_desc->num_mappings;
925 struct nfit_set_info *info;
926
927 if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
928 /* pass */;
929 else
930 return 0;
931
932 nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
933 if (!nd_set)
934 return -ENOMEM;
935
936 info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
937 if (!info)
938 return -ENOMEM;
939 for (i = 0; i < nr; i++) {
940 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
941 struct nfit_set_info_map *map = &info->mapping[i];
942 struct nvdimm *nvdimm = nd_mapping->nvdimm;
943 struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
944 struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
945 spa->range_index, i);
946
947 if (!memdev || !nfit_mem->dcr) {
948 dev_err(dev, "%s: failed to find DCR\n", __func__);
949 return -ENODEV;
950 }
951
952 map->region_offset = memdev->region_offset;
953 map->serial_number = nfit_mem->dcr->serial_number;
954 }
955
956 sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
957 cmp_map, NULL);
958 nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
959 ndr_desc->nd_set = nd_set;
960 devm_kfree(dev, info);
961
962 return 0;
963 }
964
965 static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
966 {
967 struct acpi_nfit_interleave *idt = mmio->idt;
968 u32 sub_line_offset, line_index, line_offset;
969 u64 line_no, table_skip_count, table_offset;
970
971 line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
972 table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
973 line_offset = idt->line_offset[line_index]
974 * mmio->line_size;
975 table_offset = table_skip_count * mmio->table_size;
976
977 return mmio->base_offset + line_offset + table_offset + sub_line_offset;
978 }
979
980 static u64 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
981 {
982 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
983 u64 offset = nfit_blk->stat_offset + mmio->size * bw;
984
985 if (mmio->num_lines)
986 offset = to_interleave_offset(offset, mmio);
987
988 return readq(mmio->base + offset);
989 }
990
991 static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
992 resource_size_t dpa, unsigned int len, unsigned int write)
993 {
994 u64 cmd, offset;
995 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
996
997 enum {
998 BCW_OFFSET_MASK = (1ULL << 48)-1,
999 BCW_LEN_SHIFT = 48,
1000 BCW_LEN_MASK = (1ULL << 8) - 1,
1001 BCW_CMD_SHIFT = 56,
1002 };
1003
1004 cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
1005 len = len >> L1_CACHE_SHIFT;
1006 cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
1007 cmd |= ((u64) write) << BCW_CMD_SHIFT;
1008
1009 offset = nfit_blk->cmd_offset + mmio->size * bw;
1010 if (mmio->num_lines)
1011 offset = to_interleave_offset(offset, mmio);
1012
1013 writeq(cmd, mmio->base + offset);
1014 /* FIXME: conditionally perform read-back if mandated by firmware */
1015 }
1016
1017 static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk,
1018 resource_size_t dpa, void *iobuf, size_t len, int rw,
1019 unsigned int lane)
1020 {
1021 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1022 unsigned int copied = 0;
1023 u64 base_offset;
1024 int rc;
1025
1026 base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES
1027 + lane * mmio->size;
1028 /* TODO: non-temporal access, flush hints, cache management etc... */
1029 write_blk_ctl(nfit_blk, lane, dpa, len, rw);
1030 while (len) {
1031 unsigned int c;
1032 u64 offset;
1033
1034 if (mmio->num_lines) {
1035 u32 line_offset;
1036
1037 offset = to_interleave_offset(base_offset + copied,
1038 mmio);
1039 div_u64_rem(offset, mmio->line_size, &line_offset);
1040 c = min_t(size_t, len, mmio->line_size - line_offset);
1041 } else {
1042 offset = base_offset + nfit_blk->bdw_offset;
1043 c = len;
1044 }
1045
1046 if (rw)
1047 memcpy(mmio->aperture + offset, iobuf + copied, c);
1048 else
1049 memcpy(iobuf + copied, mmio->aperture + offset, c);
1050
1051 copied += c;
1052 len -= c;
1053 }
1054 rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
1055 return rc;
1056 }
1057
1058 static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
1059 resource_size_t dpa, void *iobuf, u64 len, int rw)
1060 {
1061 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1062 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
1063 struct nd_region *nd_region = nfit_blk->nd_region;
1064 unsigned int lane, copied = 0;
1065 int rc = 0;
1066
1067 lane = nd_region_acquire_lane(nd_region);
1068 while (len) {
1069 u64 c = min(len, mmio->size);
1070
1071 rc = acpi_nfit_blk_single_io(nfit_blk, dpa + copied,
1072 iobuf + copied, c, rw, lane);
1073 if (rc)
1074 break;
1075
1076 copied += c;
1077 len -= c;
1078 }
1079 nd_region_release_lane(nd_region, lane);
1080
1081 return rc;
1082 }
1083
1084 static void nfit_spa_mapping_release(struct kref *kref)
1085 {
1086 struct nfit_spa_mapping *spa_map = to_spa_map(kref);
1087 struct acpi_nfit_system_address *spa = spa_map->spa;
1088 struct acpi_nfit_desc *acpi_desc = spa_map->acpi_desc;
1089
1090 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1091 dev_dbg(acpi_desc->dev, "%s: SPA%d\n", __func__, spa->range_index);
1092 iounmap(spa_map->iomem);
1093 release_mem_region(spa->address, spa->length);
1094 list_del(&spa_map->list);
1095 kfree(spa_map);
1096 }
1097
1098 static struct nfit_spa_mapping *find_spa_mapping(
1099 struct acpi_nfit_desc *acpi_desc,
1100 struct acpi_nfit_system_address *spa)
1101 {
1102 struct nfit_spa_mapping *spa_map;
1103
1104 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1105 list_for_each_entry(spa_map, &acpi_desc->spa_maps, list)
1106 if (spa_map->spa == spa)
1107 return spa_map;
1108
1109 return NULL;
1110 }
1111
1112 static void nfit_spa_unmap(struct acpi_nfit_desc *acpi_desc,
1113 struct acpi_nfit_system_address *spa)
1114 {
1115 struct nfit_spa_mapping *spa_map;
1116
1117 mutex_lock(&acpi_desc->spa_map_mutex);
1118 spa_map = find_spa_mapping(acpi_desc, spa);
1119
1120 if (spa_map)
1121 kref_put(&spa_map->kref, nfit_spa_mapping_release);
1122 mutex_unlock(&acpi_desc->spa_map_mutex);
1123 }
1124
1125 static void __iomem *__nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1126 struct acpi_nfit_system_address *spa)
1127 {
1128 resource_size_t start = spa->address;
1129 resource_size_t n = spa->length;
1130 struct nfit_spa_mapping *spa_map;
1131 struct resource *res;
1132
1133 WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
1134
1135 spa_map = find_spa_mapping(acpi_desc, spa);
1136 if (spa_map) {
1137 kref_get(&spa_map->kref);
1138 return spa_map->iomem;
1139 }
1140
1141 spa_map = kzalloc(sizeof(*spa_map), GFP_KERNEL);
1142 if (!spa_map)
1143 return NULL;
1144
1145 INIT_LIST_HEAD(&spa_map->list);
1146 spa_map->spa = spa;
1147 kref_init(&spa_map->kref);
1148 spa_map->acpi_desc = acpi_desc;
1149
1150 res = request_mem_region(start, n, dev_name(acpi_desc->dev));
1151 if (!res)
1152 goto err_mem;
1153
1154 /* TODO: cacheability based on the spa type */
1155 spa_map->iomem = ioremap_nocache(start, n);
1156 if (!spa_map->iomem)
1157 goto err_map;
1158
1159 list_add_tail(&spa_map->list, &acpi_desc->spa_maps);
1160 return spa_map->iomem;
1161
1162 err_map:
1163 release_mem_region(start, n);
1164 err_mem:
1165 kfree(spa_map);
1166 return NULL;
1167 }
1168
1169 /**
1170 * nfit_spa_map - interleave-aware managed-mappings of acpi_nfit_system_address ranges
1171 * @nvdimm_bus: NFIT-bus that provided the spa table entry
1172 * @nfit_spa: spa table to map
1173 *
1174 * In the case where block-data-window apertures and
1175 * dimm-control-regions are interleaved they will end up sharing a
1176 * single request_mem_region() + ioremap() for the address range. In
1177 * the style of devm nfit_spa_map() mappings are automatically dropped
1178 * when all region devices referencing the same mapping are disabled /
1179 * unbound.
1180 */
1181 static void __iomem *nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
1182 struct acpi_nfit_system_address *spa)
1183 {
1184 void __iomem *iomem;
1185
1186 mutex_lock(&acpi_desc->spa_map_mutex);
1187 iomem = __nfit_spa_map(acpi_desc, spa);
1188 mutex_unlock(&acpi_desc->spa_map_mutex);
1189
1190 return iomem;
1191 }
1192
1193 static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
1194 struct acpi_nfit_interleave *idt, u16 interleave_ways)
1195 {
1196 if (idt) {
1197 mmio->num_lines = idt->line_count;
1198 mmio->line_size = idt->line_size;
1199 if (interleave_ways == 0)
1200 return -ENXIO;
1201 mmio->table_size = mmio->num_lines * interleave_ways
1202 * mmio->line_size;
1203 }
1204
1205 return 0;
1206 }
1207
1208 static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
1209 struct device *dev)
1210 {
1211 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1212 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1213 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1214 struct nfit_blk_mmio *mmio;
1215 struct nfit_blk *nfit_blk;
1216 struct nfit_mem *nfit_mem;
1217 struct nvdimm *nvdimm;
1218 int rc;
1219
1220 nvdimm = nd_blk_region_to_dimm(ndbr);
1221 nfit_mem = nvdimm_provider_data(nvdimm);
1222 if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
1223 dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
1224 nfit_mem ? "" : " nfit_mem",
1225 nfit_mem->dcr ? "" : " dcr",
1226 nfit_mem->bdw ? "" : " bdw");
1227 return -ENXIO;
1228 }
1229
1230 nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
1231 if (!nfit_blk)
1232 return -ENOMEM;
1233 nd_blk_region_set_provider_data(ndbr, nfit_blk);
1234 nfit_blk->nd_region = to_nd_region(dev);
1235
1236 /* map block aperture memory */
1237 nfit_blk->bdw_offset = nfit_mem->bdw->offset;
1238 mmio = &nfit_blk->mmio[BDW];
1239 mmio->base = nfit_spa_map(acpi_desc, nfit_mem->spa_bdw);
1240 if (!mmio->base) {
1241 dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
1242 nvdimm_name(nvdimm));
1243 return -ENOMEM;
1244 }
1245 mmio->size = nfit_mem->bdw->size;
1246 mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
1247 mmio->idt = nfit_mem->idt_bdw;
1248 mmio->spa = nfit_mem->spa_bdw;
1249 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
1250 nfit_mem->memdev_bdw->interleave_ways);
1251 if (rc) {
1252 dev_dbg(dev, "%s: %s failed to init bdw interleave\n",
1253 __func__, nvdimm_name(nvdimm));
1254 return rc;
1255 }
1256
1257 /* map block control memory */
1258 nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
1259 nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
1260 mmio = &nfit_blk->mmio[DCR];
1261 mmio->base = nfit_spa_map(acpi_desc, nfit_mem->spa_dcr);
1262 if (!mmio->base) {
1263 dev_dbg(dev, "%s: %s failed to map dcr\n", __func__,
1264 nvdimm_name(nvdimm));
1265 return -ENOMEM;
1266 }
1267 mmio->size = nfit_mem->dcr->window_size;
1268 mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
1269 mmio->idt = nfit_mem->idt_dcr;
1270 mmio->spa = nfit_mem->spa_dcr;
1271 rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
1272 nfit_mem->memdev_dcr->interleave_ways);
1273 if (rc) {
1274 dev_dbg(dev, "%s: %s failed to init dcr interleave\n",
1275 __func__, nvdimm_name(nvdimm));
1276 return rc;
1277 }
1278
1279 if (mmio->line_size == 0)
1280 return 0;
1281
1282 if ((u32) nfit_blk->cmd_offset % mmio->line_size
1283 + 8 > mmio->line_size) {
1284 dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
1285 return -ENXIO;
1286 } else if ((u32) nfit_blk->stat_offset % mmio->line_size
1287 + 8 > mmio->line_size) {
1288 dev_dbg(dev, "stat_offset crosses interleave boundary\n");
1289 return -ENXIO;
1290 }
1291
1292 return 0;
1293 }
1294
1295 static void acpi_nfit_blk_region_disable(struct nvdimm_bus *nvdimm_bus,
1296 struct device *dev)
1297 {
1298 struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
1299 struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
1300 struct nd_blk_region *ndbr = to_nd_blk_region(dev);
1301 struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
1302 int i;
1303
1304 if (!nfit_blk)
1305 return; /* never enabled */
1306
1307 /* auto-free BLK spa mappings */
1308 for (i = 0; i < 2; i++) {
1309 struct nfit_blk_mmio *mmio = &nfit_blk->mmio[i];
1310
1311 if (mmio->base)
1312 nfit_spa_unmap(acpi_desc, mmio->spa);
1313 }
1314 nd_blk_region_set_provider_data(ndbr, NULL);
1315 /* devm will free nfit_blk */
1316 }
1317
1318 static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
1319 struct nd_mapping *nd_mapping, struct nd_region_desc *ndr_desc,
1320 struct acpi_nfit_memory_map *memdev,
1321 struct acpi_nfit_system_address *spa)
1322 {
1323 struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
1324 memdev->device_handle);
1325 struct nd_blk_region_desc *ndbr_desc;
1326 struct nfit_mem *nfit_mem;
1327 int blk_valid = 0;
1328
1329 if (!nvdimm) {
1330 dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
1331 spa->range_index, memdev->device_handle);
1332 return -ENODEV;
1333 }
1334
1335 nd_mapping->nvdimm = nvdimm;
1336 switch (nfit_spa_type(spa)) {
1337 case NFIT_SPA_PM:
1338 case NFIT_SPA_VOLATILE:
1339 nd_mapping->start = memdev->address;
1340 nd_mapping->size = memdev->region_size;
1341 break;
1342 case NFIT_SPA_DCR:
1343 nfit_mem = nvdimm_provider_data(nvdimm);
1344 if (!nfit_mem || !nfit_mem->bdw) {
1345 dev_dbg(acpi_desc->dev, "spa%d %s missing bdw\n",
1346 spa->range_index, nvdimm_name(nvdimm));
1347 } else {
1348 nd_mapping->size = nfit_mem->bdw->capacity;
1349 nd_mapping->start = nfit_mem->bdw->start_address;
1350 ndr_desc->num_lanes = nfit_mem->bdw->windows;
1351 blk_valid = 1;
1352 }
1353
1354 ndr_desc->nd_mapping = nd_mapping;
1355 ndr_desc->num_mappings = blk_valid;
1356 ndbr_desc = to_blk_region_desc(ndr_desc);
1357 ndbr_desc->enable = acpi_nfit_blk_region_enable;
1358 ndbr_desc->disable = acpi_nfit_blk_region_disable;
1359 ndbr_desc->do_io = acpi_desc->blk_do_io;
1360 if (!nvdimm_blk_region_create(acpi_desc->nvdimm_bus, ndr_desc))
1361 return -ENOMEM;
1362 break;
1363 }
1364
1365 return 0;
1366 }
1367
1368 static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
1369 struct nfit_spa *nfit_spa)
1370 {
1371 static struct nd_mapping nd_mappings[ND_MAX_MAPPINGS];
1372 struct acpi_nfit_system_address *spa = nfit_spa->spa;
1373 struct nd_blk_region_desc ndbr_desc;
1374 struct nd_region_desc *ndr_desc;
1375 struct nfit_memdev *nfit_memdev;
1376 struct nvdimm_bus *nvdimm_bus;
1377 struct resource res;
1378 int count = 0, rc;
1379
1380 if (spa->range_index == 0) {
1381 dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
1382 __func__);
1383 return 0;
1384 }
1385
1386 memset(&res, 0, sizeof(res));
1387 memset(&nd_mappings, 0, sizeof(nd_mappings));
1388 memset(&ndbr_desc, 0, sizeof(ndbr_desc));
1389 res.start = spa->address;
1390 res.end = res.start + spa->length - 1;
1391 ndr_desc = &ndbr_desc.ndr_desc;
1392 ndr_desc->res = &res;
1393 ndr_desc->provider_data = nfit_spa;
1394 ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
1395 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
1396 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
1397 struct nd_mapping *nd_mapping;
1398
1399 if (memdev->range_index != spa->range_index)
1400 continue;
1401 if (count >= ND_MAX_MAPPINGS) {
1402 dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n",
1403 spa->range_index, ND_MAX_MAPPINGS);
1404 return -ENXIO;
1405 }
1406 nd_mapping = &nd_mappings[count++];
1407 rc = acpi_nfit_init_mapping(acpi_desc, nd_mapping, ndr_desc,
1408 memdev, spa);
1409 if (rc)
1410 return rc;
1411 }
1412
1413 ndr_desc->nd_mapping = nd_mappings;
1414 ndr_desc->num_mappings = count;
1415 rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
1416 if (rc)
1417 return rc;
1418
1419 nvdimm_bus = acpi_desc->nvdimm_bus;
1420 if (nfit_spa_type(spa) == NFIT_SPA_PM) {
1421 if (!nvdimm_pmem_region_create(nvdimm_bus, ndr_desc))
1422 return -ENOMEM;
1423 } else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) {
1424 if (!nvdimm_volatile_region_create(nvdimm_bus, ndr_desc))
1425 return -ENOMEM;
1426 }
1427 return 0;
1428 }
1429
1430 static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
1431 {
1432 struct nfit_spa *nfit_spa;
1433
1434 list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
1435 int rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
1436
1437 if (rc)
1438 return rc;
1439 }
1440 return 0;
1441 }
1442
1443 int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
1444 {
1445 struct device *dev = acpi_desc->dev;
1446 const void *end;
1447 u8 *data;
1448 int rc;
1449
1450 INIT_LIST_HEAD(&acpi_desc->spa_maps);
1451 INIT_LIST_HEAD(&acpi_desc->spas);
1452 INIT_LIST_HEAD(&acpi_desc->dcrs);
1453 INIT_LIST_HEAD(&acpi_desc->bdws);
1454 INIT_LIST_HEAD(&acpi_desc->idts);
1455 INIT_LIST_HEAD(&acpi_desc->memdevs);
1456 INIT_LIST_HEAD(&acpi_desc->dimms);
1457 mutex_init(&acpi_desc->spa_map_mutex);
1458
1459 data = (u8 *) acpi_desc->nfit;
1460 end = data + sz;
1461 data += sizeof(struct acpi_table_nfit);
1462 while (!IS_ERR_OR_NULL(data))
1463 data = add_table(acpi_desc, data, end);
1464
1465 if (IS_ERR(data)) {
1466 dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,
1467 PTR_ERR(data));
1468 return PTR_ERR(data);
1469 }
1470
1471 if (nfit_mem_init(acpi_desc) != 0)
1472 return -ENOMEM;
1473
1474 acpi_nfit_init_dsms(acpi_desc);
1475
1476 rc = acpi_nfit_register_dimms(acpi_desc);
1477 if (rc)
1478 return rc;
1479
1480 return acpi_nfit_register_regions(acpi_desc);
1481 }
1482 EXPORT_SYMBOL_GPL(acpi_nfit_init);
1483
1484 static int acpi_nfit_add(struct acpi_device *adev)
1485 {
1486 struct nvdimm_bus_descriptor *nd_desc;
1487 struct acpi_nfit_desc *acpi_desc;
1488 struct device *dev = &adev->dev;
1489 struct acpi_table_header *tbl;
1490 acpi_status status = AE_OK;
1491 acpi_size sz;
1492 int rc;
1493
1494 status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz);
1495 if (ACPI_FAILURE(status)) {
1496 dev_err(dev, "failed to find NFIT\n");
1497 return -ENXIO;
1498 }
1499
1500 acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
1501 if (!acpi_desc)
1502 return -ENOMEM;
1503
1504 dev_set_drvdata(dev, acpi_desc);
1505 acpi_desc->dev = dev;
1506 acpi_desc->nfit = (struct acpi_table_nfit *) tbl;
1507 acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;
1508 nd_desc = &acpi_desc->nd_desc;
1509 nd_desc->provider_name = "ACPI.NFIT";
1510 nd_desc->ndctl = acpi_nfit_ctl;
1511 nd_desc->attr_groups = acpi_nfit_attribute_groups;
1512
1513 acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, nd_desc);
1514 if (!acpi_desc->nvdimm_bus)
1515 return -ENXIO;
1516
1517 rc = acpi_nfit_init(acpi_desc, sz);
1518 if (rc) {
1519 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
1520 return rc;
1521 }
1522 return 0;
1523 }
1524
1525 static int acpi_nfit_remove(struct acpi_device *adev)
1526 {
1527 struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
1528
1529 nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
1530 return 0;
1531 }
1532
1533 static const struct acpi_device_id acpi_nfit_ids[] = {
1534 { "ACPI0012", 0 },
1535 { "", 0 },
1536 };
1537 MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
1538
1539 static struct acpi_driver acpi_nfit_driver = {
1540 .name = KBUILD_MODNAME,
1541 .ids = acpi_nfit_ids,
1542 .ops = {
1543 .add = acpi_nfit_add,
1544 .remove = acpi_nfit_remove,
1545 },
1546 };
1547
1548 static __init int nfit_init(void)
1549 {
1550 BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
1551 BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
1552 BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
1553 BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
1554 BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
1555 BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
1556 BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
1557
1558 acpi_str_to_uuid(UUID_VOLATILE_MEMORY, nfit_uuid[NFIT_SPA_VOLATILE]);
1559 acpi_str_to_uuid(UUID_PERSISTENT_MEMORY, nfit_uuid[NFIT_SPA_PM]);
1560 acpi_str_to_uuid(UUID_CONTROL_REGION, nfit_uuid[NFIT_SPA_DCR]);
1561 acpi_str_to_uuid(UUID_DATA_REGION, nfit_uuid[NFIT_SPA_BDW]);
1562 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_VDISK]);
1563 acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_CD, nfit_uuid[NFIT_SPA_VCD]);
1564 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_PDISK]);
1565 acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_CD, nfit_uuid[NFIT_SPA_PCD]);
1566 acpi_str_to_uuid(UUID_NFIT_BUS, nfit_uuid[NFIT_DEV_BUS]);
1567 acpi_str_to_uuid(UUID_NFIT_DIMM, nfit_uuid[NFIT_DEV_DIMM]);
1568
1569 return acpi_bus_register_driver(&acpi_nfit_driver);
1570 }
1571
1572 static __exit void nfit_exit(void)
1573 {
1574 acpi_bus_unregister_driver(&acpi_nfit_driver);
1575 }
1576
1577 module_init(nfit_init);
1578 module_exit(nfit_exit);
1579 MODULE_LICENSE("GPL v2");
1580 MODULE_AUTHOR("Intel Corporation");
Linux kernel - Deliverables
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