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1/*
2 * Copyright 2014 IBM Corp.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#include <linux/kernel.h>
11#include <linux/device.h>
12#include <linux/sysfs.h>
13#include <linux/pci_regs.h>
14
15#include "cxl.h"
16
17#define to_afu_chardev_m(d) dev_get_drvdata(d)
18
19/********* Adapter attributes **********************************************/
20
21static ssize_t caia_version_show(struct device *device,
22 struct device_attribute *attr,
23 char *buf)
24{
25 struct cxl *adapter = to_cxl_adapter(device);
26
27 return scnprintf(buf, PAGE_SIZE, "%i.%i\n", adapter->caia_major,
28 adapter->caia_minor);
29}
30
31static ssize_t psl_revision_show(struct device *device,
32 struct device_attribute *attr,
33 char *buf)
34{
35 struct cxl *adapter = to_cxl_adapter(device);
36
37 return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->psl_rev);
38}
39
40static ssize_t base_image_show(struct device *device,
41 struct device_attribute *attr,
42 char *buf)
43{
44 struct cxl *adapter = to_cxl_adapter(device);
45
46 return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->base_image);
47}
48
49static ssize_t image_loaded_show(struct device *device,
50 struct device_attribute *attr,
51 char *buf)
52{
53 struct cxl *adapter = to_cxl_adapter(device);
54
55 if (adapter->user_image_loaded)
56 return scnprintf(buf, PAGE_SIZE, "user\n");
57 return scnprintf(buf, PAGE_SIZE, "factory\n");
58}
59
60static ssize_t reset_adapter_store(struct device *device,
61 struct device_attribute *attr,
62 const char *buf, size_t count)
63{
64 struct cxl *adapter = to_cxl_adapter(device);
65 int rc;
66 int val;
67
68 rc = sscanf(buf, "%i", &val);
69 if ((rc != 1) || (val != 1))
70 return -EINVAL;
71
72 if ((rc = cxl_ops->adapter_reset(adapter)))
73 return rc;
74 return count;
75}
76
77static ssize_t load_image_on_perst_show(struct device *device,
78 struct device_attribute *attr,
79 char *buf)
80{
81 struct cxl *adapter = to_cxl_adapter(device);
82
83 if (!adapter->perst_loads_image)
84 return scnprintf(buf, PAGE_SIZE, "none\n");
85
86 if (adapter->perst_select_user)
87 return scnprintf(buf, PAGE_SIZE, "user\n");
88 return scnprintf(buf, PAGE_SIZE, "factory\n");
89}
90
91static ssize_t load_image_on_perst_store(struct device *device,
92 struct device_attribute *attr,
93 const char *buf, size_t count)
94{
95 struct cxl *adapter = to_cxl_adapter(device);
96 int rc;
97
98 if (!strncmp(buf, "none", 4))
99 adapter->perst_loads_image = false;
100 else if (!strncmp(buf, "user", 4)) {
101 adapter->perst_select_user = true;
102 adapter->perst_loads_image = true;
103 } else if (!strncmp(buf, "factory", 7)) {
104 adapter->perst_select_user = false;
105 adapter->perst_loads_image = true;
106 } else
107 return -EINVAL;
108
109 if ((rc = cxl_update_image_control(adapter)))
110 return rc;
111
112 return count;
113}
114
115static ssize_t perst_reloads_same_image_show(struct device *device,
116 struct device_attribute *attr,
117 char *buf)
118{
119 struct cxl *adapter = to_cxl_adapter(device);
120
121 return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->perst_same_image);
122}
123
124static ssize_t perst_reloads_same_image_store(struct device *device,
125 struct device_attribute *attr,
126 const char *buf, size_t count)
127{
128 struct cxl *adapter = to_cxl_adapter(device);
129 int rc;
130 int val;
131
132 rc = sscanf(buf, "%i", &val);
133 if ((rc != 1) || !(val == 1 || val == 0))
134 return -EINVAL;
135
136 adapter->perst_same_image = (val == 1 ? true : false);
137 return count;
138}
139
140static struct device_attribute adapter_attrs[] = {
141 __ATTR_RO(caia_version),
142 __ATTR_RO(psl_revision),
143 __ATTR_RO(base_image),
144 __ATTR_RO(image_loaded),
145 __ATTR_RW(load_image_on_perst),
146 __ATTR_RW(perst_reloads_same_image),
147 __ATTR(reset, S_IWUSR, NULL, reset_adapter_store),
148};
149
150
151/********* AFU master specific attributes **********************************/
152
153static ssize_t mmio_size_show_master(struct device *device,
154 struct device_attribute *attr,
155 char *buf)
156{
157 struct cxl_afu *afu = to_afu_chardev_m(device);
158
159 return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
160}
161
162static ssize_t pp_mmio_off_show(struct device *device,
163 struct device_attribute *attr,
164 char *buf)
165{
166 struct cxl_afu *afu = to_afu_chardev_m(device);
167
168 return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->native->pp_offset);
169}
170
171static ssize_t pp_mmio_len_show(struct device *device,
172 struct device_attribute *attr,
173 char *buf)
174{
175 struct cxl_afu *afu = to_afu_chardev_m(device);
176
177 return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
178}
179
180static struct device_attribute afu_master_attrs[] = {
181 __ATTR(mmio_size, S_IRUGO, mmio_size_show_master, NULL),
182 __ATTR_RO(pp_mmio_off),
183 __ATTR_RO(pp_mmio_len),
184};
185
186
187/********* AFU attributes **************************************************/
188
189static ssize_t mmio_size_show(struct device *device,
190 struct device_attribute *attr,
191 char *buf)
192{
193 struct cxl_afu *afu = to_cxl_afu(device);
194
195 if (afu->pp_size)
196 return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
197 return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
198}
199
200static ssize_t reset_store_afu(struct device *device,
201 struct device_attribute *attr,
202 const char *buf, size_t count)
203{
204 struct cxl_afu *afu = to_cxl_afu(device);
205 int rc;
206
207 /* Not safe to reset if it is currently in use */
208 mutex_lock(&afu->contexts_lock);
209 if (!idr_is_empty(&afu->contexts_idr)) {
210 rc = -EBUSY;
211 goto err;
212 }
213
214 if ((rc = cxl_ops->afu_reset(afu)))
215 goto err;
216
217 rc = count;
218err:
219 mutex_unlock(&afu->contexts_lock);
220 return rc;
221}
222
223static ssize_t irqs_min_show(struct device *device,
224 struct device_attribute *attr,
225 char *buf)
226{
227 struct cxl_afu *afu = to_cxl_afu(device);
228
229 return scnprintf(buf, PAGE_SIZE, "%i\n", afu->pp_irqs);
230}
231
232static ssize_t irqs_max_show(struct device *device,
233 struct device_attribute *attr,
234 char *buf)
235{
236 struct cxl_afu *afu = to_cxl_afu(device);
237
238 return scnprintf(buf, PAGE_SIZE, "%i\n", afu->irqs_max);
239}
240
241static ssize_t irqs_max_store(struct device *device,
242 struct device_attribute *attr,
243 const char *buf, size_t count)
244{
245 struct cxl_afu *afu = to_cxl_afu(device);
246 ssize_t ret;
247 int irqs_max;
248
249 ret = sscanf(buf, "%i", &irqs_max);
250 if (ret != 1)
251 return -EINVAL;
252
253 if (irqs_max < afu->pp_irqs)
254 return -EINVAL;
255
256 if (cpu_has_feature(CPU_FTR_HVMODE)) {
257 if (irqs_max > afu->adapter->user_irqs)
258 return -EINVAL;
259 } else {
260 /* pHyp sets a per-AFU limit */
261 if (irqs_max > afu->guest->max_ints)
262 return -EINVAL;
263 }
264
265 afu->irqs_max = irqs_max;
266 return count;
267}
268
269static ssize_t modes_supported_show(struct device *device,
270 struct device_attribute *attr, char *buf)
271{
272 struct cxl_afu *afu = to_cxl_afu(device);
273 char *p = buf, *end = buf + PAGE_SIZE;
274
275 if (afu->modes_supported & CXL_MODE_DEDICATED)
276 p += scnprintf(p, end - p, "dedicated_process\n");
277 if (afu->modes_supported & CXL_MODE_DIRECTED)
278 p += scnprintf(p, end - p, "afu_directed\n");
279 return (p - buf);
280}
281
282static ssize_t prefault_mode_show(struct device *device,
283 struct device_attribute *attr,
284 char *buf)
285{
286 struct cxl_afu *afu = to_cxl_afu(device);
287
288 switch (afu->prefault_mode) {
289 case CXL_PREFAULT_WED:
290 return scnprintf(buf, PAGE_SIZE, "work_element_descriptor\n");
291 case CXL_PREFAULT_ALL:
292 return scnprintf(buf, PAGE_SIZE, "all\n");
293 default:
294 return scnprintf(buf, PAGE_SIZE, "none\n");
295 }
296}
297
298static ssize_t prefault_mode_store(struct device *device,
299 struct device_attribute *attr,
300 const char *buf, size_t count)
301{
302 struct cxl_afu *afu = to_cxl_afu(device);
303 enum prefault_modes mode = -1;
304
305 if (!strncmp(buf, "work_element_descriptor", 23))
306 mode = CXL_PREFAULT_WED;
307 if (!strncmp(buf, "all", 3))
308 mode = CXL_PREFAULT_ALL;
309 if (!strncmp(buf, "none", 4))
310 mode = CXL_PREFAULT_NONE;
311
312 if (mode == -1)
313 return -EINVAL;
314
315 afu->prefault_mode = mode;
316 return count;
317}
318
319static ssize_t mode_show(struct device *device,
320 struct device_attribute *attr,
321 char *buf)
322{
323 struct cxl_afu *afu = to_cxl_afu(device);
324
325 if (afu->current_mode == CXL_MODE_DEDICATED)
326 return scnprintf(buf, PAGE_SIZE, "dedicated_process\n");
327 if (afu->current_mode == CXL_MODE_DIRECTED)
328 return scnprintf(buf, PAGE_SIZE, "afu_directed\n");
329 return scnprintf(buf, PAGE_SIZE, "none\n");
330}
331
332static ssize_t mode_store(struct device *device, struct device_attribute *attr,
333 const char *buf, size_t count)
334{
335 struct cxl_afu *afu = to_cxl_afu(device);
336 int old_mode, mode = -1;
337 int rc = -EBUSY;
338
339 /* can't change this if we have a user */
340 mutex_lock(&afu->contexts_lock);
341 if (!idr_is_empty(&afu->contexts_idr))
342 goto err;
343
344 if (!strncmp(buf, "dedicated_process", 17))
345 mode = CXL_MODE_DEDICATED;
346 if (!strncmp(buf, "afu_directed", 12))
347 mode = CXL_MODE_DIRECTED;
348 if (!strncmp(buf, "none", 4))
349 mode = 0;
350
351 if (mode == -1) {
352 rc = -EINVAL;
353 goto err;
354 }
355
356 /*
357 * afu_deactivate_mode needs to be done outside the lock, prevent
358 * other contexts coming in before we are ready:
359 */
360 old_mode = afu->current_mode;
361 afu->current_mode = 0;
362 afu->num_procs = 0;
363
364 mutex_unlock(&afu->contexts_lock);
365
366 if ((rc = cxl_ops->afu_deactivate_mode(afu, old_mode)))
367 return rc;
368 if ((rc = cxl_ops->afu_activate_mode(afu, mode)))
369 return rc;
370
371 return count;
372err:
373 mutex_unlock(&afu->contexts_lock);
374 return rc;
375}
376
377static ssize_t api_version_show(struct device *device,
378 struct device_attribute *attr,
379 char *buf)
380{
381 return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION);
382}
383
384static ssize_t api_version_compatible_show(struct device *device,
385 struct device_attribute *attr,
386 char *buf)
387{
388 return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION_COMPATIBLE);
389}
390
391static ssize_t afu_eb_read(struct file *filp, struct kobject *kobj,
392 struct bin_attribute *bin_attr, char *buf,
393 loff_t off, size_t count)
394{
395 struct cxl_afu *afu = to_cxl_afu(kobj_to_dev(kobj));
396
397 return cxl_ops->afu_read_err_buffer(afu, buf, off, count);
398}
399
400static struct device_attribute afu_attrs[] = {
401 __ATTR_RO(mmio_size),
402 __ATTR_RO(irqs_min),
403 __ATTR_RW(irqs_max),
404 __ATTR_RO(modes_supported),
405 __ATTR_RW(mode),
406 __ATTR_RW(prefault_mode),
407 __ATTR_RO(api_version),
408 __ATTR_RO(api_version_compatible),
409 __ATTR(reset, S_IWUSR, NULL, reset_store_afu),
410};
411
412int cxl_sysfs_adapter_add(struct cxl *adapter)
413{
414 struct device_attribute *dev_attr;
415 int i, rc;
416
417 for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) {
418 dev_attr = &adapter_attrs[i];
419 if (cxl_ops->support_attributes(dev_attr->attr.name,
420 CXL_ADAPTER_ATTRS)) {
421 if ((rc = device_create_file(&adapter->dev, dev_attr)))
422 goto err;
423 }
424 }
425 return 0;
426err:
427 for (i--; i >= 0; i--) {
428 dev_attr = &adapter_attrs[i];
429 if (cxl_ops->support_attributes(dev_attr->attr.name,
430 CXL_ADAPTER_ATTRS))
431 device_remove_file(&adapter->dev, dev_attr);
432 }
433 return rc;
434}
435
436void cxl_sysfs_adapter_remove(struct cxl *adapter)
437{
438 struct device_attribute *dev_attr;
439 int i;
440
441 for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) {
442 dev_attr = &adapter_attrs[i];
443 if (cxl_ops->support_attributes(dev_attr->attr.name,
444 CXL_ADAPTER_ATTRS))
445 device_remove_file(&adapter->dev, dev_attr);
446 }
447}
448
449struct afu_config_record {
450 struct kobject kobj;
451 struct bin_attribute config_attr;
452 struct list_head list;
453 int cr;
454 u16 device;
455 u16 vendor;
456 u32 class;
457};
458
459#define to_cr(obj) container_of(obj, struct afu_config_record, kobj)
460
461static ssize_t vendor_show(struct kobject *kobj,
462 struct kobj_attribute *attr, char *buf)
463{
464 struct afu_config_record *cr = to_cr(kobj);
465
466 return scnprintf(buf, PAGE_SIZE, "0x%.4x\n", cr->vendor);
467}
468
469static ssize_t device_show(struct kobject *kobj,
470 struct kobj_attribute *attr, char *buf)
471{
472 struct afu_config_record *cr = to_cr(kobj);
473
474 return scnprintf(buf, PAGE_SIZE, "0x%.4x\n", cr->device);
475}
476
477static ssize_t class_show(struct kobject *kobj,
478 struct kobj_attribute *attr, char *buf)
479{
480 struct afu_config_record *cr = to_cr(kobj);
481
482 return scnprintf(buf, PAGE_SIZE, "0x%.6x\n", cr->class);
483}
484
485static ssize_t afu_read_config(struct file *filp, struct kobject *kobj,
486 struct bin_attribute *bin_attr, char *buf,
487 loff_t off, size_t count)
488{
489 struct afu_config_record *cr = to_cr(kobj);
490 struct cxl_afu *afu = to_cxl_afu(kobj_to_dev(kobj->parent));
491
492 u64 i, j, val, rc;
493
494 for (i = 0; i < count;) {
495 rc = cxl_ops->afu_cr_read64(afu, cr->cr, off & ~0x7, &val);
496 if (rc)
497 val = ~0ULL;
498 for (j = off & 0x7; j < 8 && i < count; i++, j++, off++)
499 buf[i] = (val >> (j * 8)) & 0xff;
500 }
501
502 return count;
503}
504
505static struct kobj_attribute vendor_attribute =
506 __ATTR_RO(vendor);
507static struct kobj_attribute device_attribute =
508 __ATTR_RO(device);
509static struct kobj_attribute class_attribute =
510 __ATTR_RO(class);
511
512static struct attribute *afu_cr_attrs[] = {
513 &vendor_attribute.attr,
514 &device_attribute.attr,
515 &class_attribute.attr,
516 NULL,
517};
518
519static void release_afu_config_record(struct kobject *kobj)
520{
521 struct afu_config_record *cr = to_cr(kobj);
522
523 kfree(cr);
524}
525
526static struct kobj_type afu_config_record_type = {
527 .sysfs_ops = &kobj_sysfs_ops,
528 .release = release_afu_config_record,
529 .default_attrs = afu_cr_attrs,
530};
531
532static struct afu_config_record *cxl_sysfs_afu_new_cr(struct cxl_afu *afu, int cr_idx)
533{
534 struct afu_config_record *cr;
535 int rc;
536
537 cr = kzalloc(sizeof(struct afu_config_record), GFP_KERNEL);
538 if (!cr)
539 return ERR_PTR(-ENOMEM);
540
541 cr->cr = cr_idx;
542
543 rc = cxl_ops->afu_cr_read16(afu, cr_idx, PCI_DEVICE_ID, &cr->device);
544 if (rc)
545 goto err;
546 rc = cxl_ops->afu_cr_read16(afu, cr_idx, PCI_VENDOR_ID, &cr->vendor);
547 if (rc)
548 goto err;
549 rc = cxl_ops->afu_cr_read32(afu, cr_idx, PCI_CLASS_REVISION, &cr->class);
550 if (rc)
551 goto err;
552 cr->class >>= 8;
553
554 /*
555 * Export raw AFU PCIe like config record. For now this is read only by
556 * root - we can expand that later to be readable by non-root and maybe
557 * even writable provided we have a good use-case. Once we support
558 * exposing AFUs through a virtual PHB they will get that for free from
559 * Linux' PCI infrastructure, but until then it's not clear that we
560 * need it for anything since the main use case is just identifying
561 * AFUs, which can be done via the vendor, device and class attributes.
562 */
563 sysfs_bin_attr_init(&cr->config_attr);
564 cr->config_attr.attr.name = "config";
565 cr->config_attr.attr.mode = S_IRUSR;
566 cr->config_attr.size = afu->crs_len;
567 cr->config_attr.read = afu_read_config;
568
569 rc = kobject_init_and_add(&cr->kobj, &afu_config_record_type,
570 &afu->dev.kobj, "cr%i", cr->cr);
571 if (rc)
572 goto err;
573
574 rc = sysfs_create_bin_file(&cr->kobj, &cr->config_attr);
575 if (rc)
576 goto err1;
577
578 rc = kobject_uevent(&cr->kobj, KOBJ_ADD);
579 if (rc)
580 goto err2;
581
582 return cr;
583err2:
584 sysfs_remove_bin_file(&cr->kobj, &cr->config_attr);
585err1:
586 kobject_put(&cr->kobj);
587 return ERR_PTR(rc);
588err:
589 kfree(cr);
590 return ERR_PTR(rc);
591}
592
593void cxl_sysfs_afu_remove(struct cxl_afu *afu)
594{
595 struct device_attribute *dev_attr;
596 struct afu_config_record *cr, *tmp;
597 int i;
598
599 /* remove the err buffer bin attribute */
600 if (afu->eb_len)
601 device_remove_bin_file(&afu->dev, &afu->attr_eb);
602
603 for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
604 dev_attr = &afu_attrs[i];
605 if (cxl_ops->support_attributes(dev_attr->attr.name,
606 CXL_AFU_ATTRS))
607 device_remove_file(&afu->dev, &afu_attrs[i]);
608 }
609
610 list_for_each_entry_safe(cr, tmp, &afu->crs, list) {
611 sysfs_remove_bin_file(&cr->kobj, &cr->config_attr);
612 kobject_put(&cr->kobj);
613 }
614}
615
616int cxl_sysfs_afu_add(struct cxl_afu *afu)
617{
618 struct device_attribute *dev_attr;
619 struct afu_config_record *cr;
620 int i, rc;
621
622 INIT_LIST_HEAD(&afu->crs);
623
624 for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
625 dev_attr = &afu_attrs[i];
626 if (cxl_ops->support_attributes(dev_attr->attr.name,
627 CXL_AFU_ATTRS)) {
628 if ((rc = device_create_file(&afu->dev, &afu_attrs[i])))
629 goto err;
630 }
631 }
632
633 /* conditionally create the add the binary file for error info buffer */
634 if (afu->eb_len) {
635 sysfs_attr_init(&afu->attr_eb.attr);
636
637 afu->attr_eb.attr.name = "afu_err_buff";
638 afu->attr_eb.attr.mode = S_IRUGO;
639 afu->attr_eb.size = afu->eb_len;
640 afu->attr_eb.read = afu_eb_read;
641
642 rc = device_create_bin_file(&afu->dev, &afu->attr_eb);
643 if (rc) {
644 dev_err(&afu->dev,
645 "Unable to create eb attr for the afu. Err(%d)\n",
646 rc);
647 goto err;
648 }
649 }
650
651 for (i = 0; i < afu->crs_num; i++) {
652 cr = cxl_sysfs_afu_new_cr(afu, i);
653 if (IS_ERR(cr)) {
654 rc = PTR_ERR(cr);
655 goto err1;
656 }
657 list_add(&cr->list, &afu->crs);
658 }
659
660 return 0;
661
662err1:
663 cxl_sysfs_afu_remove(afu);
664 return rc;
665err:
666 /* reset the eb_len as we havent created the bin attr */
667 afu->eb_len = 0;
668
669 for (i--; i >= 0; i--) {
670 dev_attr = &afu_attrs[i];
671 if (cxl_ops->support_attributes(dev_attr->attr.name,
672 CXL_AFU_ATTRS))
673 device_remove_file(&afu->dev, &afu_attrs[i]);
674 }
675 return rc;
676}
677
678int cxl_sysfs_afu_m_add(struct cxl_afu *afu)
679{
680 struct device_attribute *dev_attr;
681 int i, rc;
682
683 for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++) {
684 dev_attr = &afu_master_attrs[i];
685 if (cxl_ops->support_attributes(dev_attr->attr.name,
686 CXL_AFU_MASTER_ATTRS)) {
687 if ((rc = device_create_file(afu->chardev_m, &afu_master_attrs[i])))
688 goto err;
689 }
690 }
691
692 return 0;
693
694err:
695 for (i--; i >= 0; i--) {
696 dev_attr = &afu_master_attrs[i];
697 if (cxl_ops->support_attributes(dev_attr->attr.name,
698 CXL_AFU_MASTER_ATTRS))
699 device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
700 }
701 return rc;
702}
703
704void cxl_sysfs_afu_m_remove(struct cxl_afu *afu)
705{
706 struct device_attribute *dev_attr;
707 int i;
708
709 for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++) {
710 dev_attr = &afu_master_attrs[i];
711 if (cxl_ops->support_attributes(dev_attr->attr.name,
712 CXL_AFU_MASTER_ATTRS))
713 device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
714 }
715}