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1/*
2 * Copyright 2015 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/spinlock.h>
11#include <linux/uaccess.h>
12#include <linux/delay.h>
13
14#include "cxl.h"
15#include "hcalls.h"
16#include "trace.h"
17
18#define CXL_ERROR_DETECTED_EVENT 1
19#define CXL_SLOT_RESET_EVENT 2
20#define CXL_RESUME_EVENT 3
21
22static void pci_error_handlers(struct cxl_afu *afu,
23 int bus_error_event,
24 pci_channel_state_t state)
25{
26 struct pci_dev *afu_dev;
27
28 if (afu->phb == NULL)
29 return;
30
31 list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
32 if (!afu_dev->driver)
33 continue;
34
35 switch (bus_error_event) {
36 case CXL_ERROR_DETECTED_EVENT:
37 afu_dev->error_state = state;
38
39 if (afu_dev->driver->err_handler &&
40 afu_dev->driver->err_handler->error_detected)
41 afu_dev->driver->err_handler->error_detected(afu_dev, state);
42 break;
43 case CXL_SLOT_RESET_EVENT:
44 afu_dev->error_state = state;
45
46 if (afu_dev->driver->err_handler &&
47 afu_dev->driver->err_handler->slot_reset)
48 afu_dev->driver->err_handler->slot_reset(afu_dev);
49 break;
50 case CXL_RESUME_EVENT:
51 if (afu_dev->driver->err_handler &&
52 afu_dev->driver->err_handler->resume)
53 afu_dev->driver->err_handler->resume(afu_dev);
54 break;
55 }
56 }
57}
58
59static irqreturn_t guest_handle_psl_slice_error(struct cxl_context *ctx, u64 dsisr,
60 u64 errstat)
61{
62 pr_devel("in %s\n", __func__);
63 dev_crit(&ctx->afu->dev, "PSL ERROR STATUS: 0x%.16llx\n", errstat);
64
65 return cxl_ops->ack_irq(ctx, 0, errstat);
66}
67
68static ssize_t guest_collect_vpd(struct cxl *adapter, struct cxl_afu *afu,
69 void *buf, size_t len)
70{
71 unsigned int entries, mod;
72 unsigned long **vpd_buf = NULL;
73 struct sg_list *le;
74 int rc = 0, i, tocopy;
75 u64 out = 0;
76
77 if (buf == NULL)
78 return -EINVAL;
79
80 /* number of entries in the list */
81 entries = len / SG_BUFFER_SIZE;
82 mod = len % SG_BUFFER_SIZE;
83 if (mod)
84 entries++;
85
86 if (entries > SG_MAX_ENTRIES) {
87 entries = SG_MAX_ENTRIES;
88 len = SG_MAX_ENTRIES * SG_BUFFER_SIZE;
89 mod = 0;
90 }
91
92 vpd_buf = kzalloc(entries * sizeof(unsigned long *), GFP_KERNEL);
93 if (!vpd_buf)
94 return -ENOMEM;
95
96 le = (struct sg_list *)get_zeroed_page(GFP_KERNEL);
97 if (!le) {
98 rc = -ENOMEM;
99 goto err1;
100 }
101
102 for (i = 0; i < entries; i++) {
103 vpd_buf[i] = (unsigned long *)get_zeroed_page(GFP_KERNEL);
104 if (!vpd_buf[i]) {
105 rc = -ENOMEM;
106 goto err2;
107 }
108 le[i].phys_addr = cpu_to_be64(virt_to_phys(vpd_buf[i]));
109 le[i].len = cpu_to_be64(SG_BUFFER_SIZE);
110 if ((i == (entries - 1)) && mod)
111 le[i].len = cpu_to_be64(mod);
112 }
113
114 if (adapter)
115 rc = cxl_h_collect_vpd_adapter(adapter->guest->handle,
116 virt_to_phys(le), entries, &out);
117 else
118 rc = cxl_h_collect_vpd(afu->guest->handle, 0,
119 virt_to_phys(le), entries, &out);
120 pr_devel("length of available (entries: %i), vpd: %#llx\n",
121 entries, out);
122
123 if (!rc) {
124 /*
125 * hcall returns in 'out' the size of available VPDs.
126 * It fills the buffer with as much data as possible.
127 */
128 if (out < len)
129 len = out;
130 rc = len;
131 if (out) {
132 for (i = 0; i < entries; i++) {
133 if (len < SG_BUFFER_SIZE)
134 tocopy = len;
135 else
136 tocopy = SG_BUFFER_SIZE;
137 memcpy(buf, vpd_buf[i], tocopy);
138 buf += tocopy;
139 len -= tocopy;
140 }
141 }
142 }
143err2:
144 for (i = 0; i < entries; i++) {
145 if (vpd_buf[i])
146 free_page((unsigned long) vpd_buf[i]);
147 }
148 free_page((unsigned long) le);
149err1:
150 kfree(vpd_buf);
151 return rc;
152}
153
154static int guest_get_irq_info(struct cxl_context *ctx, struct cxl_irq_info *info)
155{
156 return cxl_h_collect_int_info(ctx->afu->guest->handle, ctx->process_token, info);
157}
158
159static irqreturn_t guest_psl_irq(int irq, void *data)
160{
161 struct cxl_context *ctx = data;
162 struct cxl_irq_info irq_info;
163 int rc;
164
165 pr_devel("%d: received PSL interrupt %i\n", ctx->pe, irq);
166 rc = guest_get_irq_info(ctx, &irq_info);
167 if (rc) {
168 WARN(1, "Unable to get IRQ info: %i\n", rc);
169 return IRQ_HANDLED;
170 }
171
172 rc = cxl_irq(irq, ctx, &irq_info);
173 return rc;
174}
175
176static int afu_read_error_state(struct cxl_afu *afu, int *state_out)
177{
178 u64 state;
179 int rc = 0;
180
181 if (!afu)
182 return -EIO;
183
184 rc = cxl_h_read_error_state(afu->guest->handle, &state);
185 if (!rc) {
186 WARN_ON(state != H_STATE_NORMAL &&
187 state != H_STATE_DISABLE &&
188 state != H_STATE_TEMP_UNAVAILABLE &&
189 state != H_STATE_PERM_UNAVAILABLE);
190 *state_out = state & 0xffffffff;
191 }
192 return rc;
193}
194
195static irqreturn_t guest_slice_irq_err(int irq, void *data)
196{
197 struct cxl_afu *afu = data;
198 int rc;
199 u64 serr, afu_error, dsisr;
200
201 rc = cxl_h_get_fn_error_interrupt(afu->guest->handle, &serr);
202 if (rc) {
203 dev_crit(&afu->dev, "Couldn't read PSL_SERR_An: %d\n", rc);
204 return IRQ_HANDLED;
205 }
206 afu_error = cxl_p2n_read(afu, CXL_AFU_ERR_An);
207 dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An);
208 cxl_afu_decode_psl_serr(afu, serr);
209 dev_crit(&afu->dev, "AFU_ERR_An: 0x%.16llx\n", afu_error);
210 dev_crit(&afu->dev, "PSL_DSISR_An: 0x%.16llx\n", dsisr);
211
212 rc = cxl_h_ack_fn_error_interrupt(afu->guest->handle, serr);
213 if (rc)
214 dev_crit(&afu->dev, "Couldn't ack slice error interrupt: %d\n",
215 rc);
216
217 return IRQ_HANDLED;
218}
219
220
221static int irq_alloc_range(struct cxl *adapter, int len, int *irq)
222{
223 int i, n;
224 struct irq_avail *cur;
225
226 for (i = 0; i < adapter->guest->irq_nranges; i++) {
227 cur = &adapter->guest->irq_avail[i];
228 n = bitmap_find_next_zero_area(cur->bitmap, cur->range,
229 0, len, 0);
230 if (n < cur->range) {
231 bitmap_set(cur->bitmap, n, len);
232 *irq = cur->offset + n;
233 pr_devel("guest: allocate IRQs %#x->%#x\n",
234 *irq, *irq + len - 1);
235
236 return 0;
237 }
238 }
239 return -ENOSPC;
240}
241
242static int irq_free_range(struct cxl *adapter, int irq, int len)
243{
244 int i, n;
245 struct irq_avail *cur;
246
247 if (len == 0)
248 return -ENOENT;
249
250 for (i = 0; i < adapter->guest->irq_nranges; i++) {
251 cur = &adapter->guest->irq_avail[i];
252 if (irq >= cur->offset &&
253 (irq + len) <= (cur->offset + cur->range)) {
254 n = irq - cur->offset;
255 bitmap_clear(cur->bitmap, n, len);
256 pr_devel("guest: release IRQs %#x->%#x\n",
257 irq, irq + len - 1);
258 return 0;
259 }
260 }
261 return -ENOENT;
262}
263
264static int guest_reset(struct cxl *adapter)
265{
266 struct cxl_afu *afu = NULL;
267 int i, rc;
268
269 pr_devel("Adapter reset request\n");
270 for (i = 0; i < adapter->slices; i++) {
271 if ((afu = adapter->afu[i])) {
272 pci_error_handlers(afu, CXL_ERROR_DETECTED_EVENT,
273 pci_channel_io_frozen);
274 cxl_context_detach_all(afu);
275 }
276 }
277
278 rc = cxl_h_reset_adapter(adapter->guest->handle);
279 for (i = 0; i < adapter->slices; i++) {
280 if (!rc && (afu = adapter->afu[i])) {
281 pci_error_handlers(afu, CXL_SLOT_RESET_EVENT,
282 pci_channel_io_normal);
283 pci_error_handlers(afu, CXL_RESUME_EVENT, 0);
284 }
285 }
286 return rc;
287}
288
289static int guest_alloc_one_irq(struct cxl *adapter)
290{
291 int irq;
292
293 spin_lock(&adapter->guest->irq_alloc_lock);
294 if (irq_alloc_range(adapter, 1, &irq))
295 irq = -ENOSPC;
296 spin_unlock(&adapter->guest->irq_alloc_lock);
297 return irq;
298}
299
300static void guest_release_one_irq(struct cxl *adapter, int irq)
301{
302 spin_lock(&adapter->guest->irq_alloc_lock);
303 irq_free_range(adapter, irq, 1);
304 spin_unlock(&adapter->guest->irq_alloc_lock);
305}
306
307static int guest_alloc_irq_ranges(struct cxl_irq_ranges *irqs,
308 struct cxl *adapter, unsigned int num)
309{
310 int i, try, irq;
311
312 memset(irqs, 0, sizeof(struct cxl_irq_ranges));
313
314 spin_lock(&adapter->guest->irq_alloc_lock);
315 for (i = 0; i < CXL_IRQ_RANGES && num; i++) {
316 try = num;
317 while (try) {
318 if (irq_alloc_range(adapter, try, &irq) == 0)
319 break;
320 try /= 2;
321 }
322 if (!try)
323 goto error;
324 irqs->offset[i] = irq;
325 irqs->range[i] = try;
326 num -= try;
327 }
328 if (num)
329 goto error;
330 spin_unlock(&adapter->guest->irq_alloc_lock);
331 return 0;
332
333error:
334 for (i = 0; i < CXL_IRQ_RANGES; i++)
335 irq_free_range(adapter, irqs->offset[i], irqs->range[i]);
336 spin_unlock(&adapter->guest->irq_alloc_lock);
337 return -ENOSPC;
338}
339
340static void guest_release_irq_ranges(struct cxl_irq_ranges *irqs,
341 struct cxl *adapter)
342{
343 int i;
344
345 spin_lock(&adapter->guest->irq_alloc_lock);
346 for (i = 0; i < CXL_IRQ_RANGES; i++)
347 irq_free_range(adapter, irqs->offset[i], irqs->range[i]);
348 spin_unlock(&adapter->guest->irq_alloc_lock);
349}
350
351static int guest_register_serr_irq(struct cxl_afu *afu)
352{
353 afu->err_irq_name = kasprintf(GFP_KERNEL, "cxl-%s-err",
354 dev_name(&afu->dev));
355 if (!afu->err_irq_name)
356 return -ENOMEM;
357
358 if (!(afu->serr_virq = cxl_map_irq(afu->adapter, afu->serr_hwirq,
359 guest_slice_irq_err, afu, afu->err_irq_name))) {
360 kfree(afu->err_irq_name);
361 afu->err_irq_name = NULL;
362 return -ENOMEM;
363 }
364
365 return 0;
366}
367
368static void guest_release_serr_irq(struct cxl_afu *afu)
369{
370 cxl_unmap_irq(afu->serr_virq, afu);
371 cxl_ops->release_one_irq(afu->adapter, afu->serr_hwirq);
372 kfree(afu->err_irq_name);
373}
374
375static int guest_ack_irq(struct cxl_context *ctx, u64 tfc, u64 psl_reset_mask)
376{
377 return cxl_h_control_faults(ctx->afu->guest->handle, ctx->process_token,
378 tfc >> 32, (psl_reset_mask != 0));
379}
380
381static void disable_afu_irqs(struct cxl_context *ctx)
382{
383 irq_hw_number_t hwirq;
384 unsigned int virq;
385 int r, i;
386
387 pr_devel("Disabling AFU(%d) interrupts\n", ctx->afu->slice);
388 for (r = 0; r < CXL_IRQ_RANGES; r++) {
389 hwirq = ctx->irqs.offset[r];
390 for (i = 0; i < ctx->irqs.range[r]; hwirq++, i++) {
391 virq = irq_find_mapping(NULL, hwirq);
392 disable_irq(virq);
393 }
394 }
395}
396
397static void enable_afu_irqs(struct cxl_context *ctx)
398{
399 irq_hw_number_t hwirq;
400 unsigned int virq;
401 int r, i;
402
403 pr_devel("Enabling AFU(%d) interrupts\n", ctx->afu->slice);
404 for (r = 0; r < CXL_IRQ_RANGES; r++) {
405 hwirq = ctx->irqs.offset[r];
406 for (i = 0; i < ctx->irqs.range[r]; hwirq++, i++) {
407 virq = irq_find_mapping(NULL, hwirq);
408 enable_irq(virq);
409 }
410 }
411}
412
413static int _guest_afu_cr_readXX(int sz, struct cxl_afu *afu, int cr_idx,
414 u64 offset, u64 *val)
415{
416 unsigned long cr;
417 char c;
418 int rc = 0;
419
420 if (afu->crs_len < sz)
421 return -ENOENT;
422
423 if (unlikely(offset >= afu->crs_len))
424 return -ERANGE;
425
426 cr = get_zeroed_page(GFP_KERNEL);
427 if (!cr)
428 return -ENOMEM;
429
430 rc = cxl_h_get_config(afu->guest->handle, cr_idx, offset,
431 virt_to_phys((void *)cr), sz);
432 if (rc)
433 goto err;
434
435 switch (sz) {
436 case 1:
437 c = *((char *) cr);
438 *val = c;
439 break;
440 case 2:
441 *val = in_le16((u16 *)cr);
442 break;
443 case 4:
444 *val = in_le32((unsigned *)cr);
445 break;
446 case 8:
447 *val = in_le64((u64 *)cr);
448 break;
449 default:
450 WARN_ON(1);
451 }
452err:
453 free_page(cr);
454 return rc;
455}
456
457static int guest_afu_cr_read32(struct cxl_afu *afu, int cr_idx, u64 offset,
458 u32 *out)
459{
460 int rc;
461 u64 val;
462
463 rc = _guest_afu_cr_readXX(4, afu, cr_idx, offset, &val);
464 if (!rc)
465 *out = (u32) val;
466 return rc;
467}
468
469static int guest_afu_cr_read16(struct cxl_afu *afu, int cr_idx, u64 offset,
470 u16 *out)
471{
472 int rc;
473 u64 val;
474
475 rc = _guest_afu_cr_readXX(2, afu, cr_idx, offset, &val);
476 if (!rc)
477 *out = (u16) val;
478 return rc;
479}
480
481static int guest_afu_cr_read8(struct cxl_afu *afu, int cr_idx, u64 offset,
482 u8 *out)
483{
484 int rc;
485 u64 val;
486
487 rc = _guest_afu_cr_readXX(1, afu, cr_idx, offset, &val);
488 if (!rc)
489 *out = (u8) val;
490 return rc;
491}
492
493static int guest_afu_cr_read64(struct cxl_afu *afu, int cr_idx, u64 offset,
494 u64 *out)
495{
496 return _guest_afu_cr_readXX(8, afu, cr_idx, offset, out);
497}
498
499static int guest_afu_cr_write32(struct cxl_afu *afu, int cr, u64 off, u32 in)
500{
501 /* config record is not writable from guest */
502 return -EPERM;
503}
504
505static int guest_afu_cr_write16(struct cxl_afu *afu, int cr, u64 off, u16 in)
506{
507 /* config record is not writable from guest */
508 return -EPERM;
509}
510
511static int guest_afu_cr_write8(struct cxl_afu *afu, int cr, u64 off, u8 in)
512{
513 /* config record is not writable from guest */
514 return -EPERM;
515}
516
517static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr)
518{
519 struct cxl_process_element_hcall *elem;
520 struct cxl *adapter = ctx->afu->adapter;
521 const struct cred *cred;
522 u32 pid, idx;
523 int rc, r, i;
524 u64 mmio_addr, mmio_size;
525 __be64 flags = 0;
526
527 /* Must be 8 byte aligned and cannot cross a 4096 byte boundary */
528 if (!(elem = (struct cxl_process_element_hcall *)
529 get_zeroed_page(GFP_KERNEL)))
530 return -ENOMEM;
531
532 elem->version = cpu_to_be64(CXL_PROCESS_ELEMENT_VERSION);
533 if (ctx->kernel) {
534 pid = 0;
535 flags |= CXL_PE_TRANSLATION_ENABLED;
536 flags |= CXL_PE_PRIVILEGED_PROCESS;
537 if (mfmsr() & MSR_SF)
538 flags |= CXL_PE_64_BIT;
539 } else {
540 pid = current->pid;
541 flags |= CXL_PE_PROBLEM_STATE;
542 flags |= CXL_PE_TRANSLATION_ENABLED;
543 if (!test_tsk_thread_flag(current, TIF_32BIT))
544 flags |= CXL_PE_64_BIT;
545 cred = get_current_cred();
546 if (uid_eq(cred->euid, GLOBAL_ROOT_UID))
547 flags |= CXL_PE_PRIVILEGED_PROCESS;
548 put_cred(cred);
549 }
550 elem->flags = cpu_to_be64(flags);
551 elem->common.tid = cpu_to_be32(0); /* Unused */
552 elem->common.pid = cpu_to_be32(pid);
553 elem->common.csrp = cpu_to_be64(0); /* disable */
554 elem->common.aurp0 = cpu_to_be64(0); /* disable */
555 elem->common.aurp1 = cpu_to_be64(0); /* disable */
556
557 cxl_prefault(ctx, wed);
558
559 elem->common.sstp0 = cpu_to_be64(ctx->sstp0);
560 elem->common.sstp1 = cpu_to_be64(ctx->sstp1);
561
562 /*
563 * Ensure we have at least one interrupt allocated to take faults for
564 * kernel contexts that may not have allocated any AFU IRQs at all:
565 */
566 if (ctx->irqs.range[0] == 0) {
567 rc = afu_register_irqs(ctx, 0);
568 if (rc)
569 goto out_free;
570 }
571
572 for (r = 0; r < CXL_IRQ_RANGES; r++) {
573 for (i = 0; i < ctx->irqs.range[r]; i++) {
574 if (r == 0 && i == 0) {
575 elem->pslVirtualIsn = cpu_to_be32(ctx->irqs.offset[0]);
576 } else {
577 idx = ctx->irqs.offset[r] + i - adapter->guest->irq_base_offset;
578 elem->applicationVirtualIsnBitmap[idx / 8] |= 0x80 >> (idx % 8);
579 }
580 }
581 }
582 elem->common.amr = cpu_to_be64(amr);
583 elem->common.wed = cpu_to_be64(wed);
584
585 disable_afu_irqs(ctx);
586
587 rc = cxl_h_attach_process(ctx->afu->guest->handle, elem,
588 &ctx->process_token, &mmio_addr, &mmio_size);
589 if (rc == H_SUCCESS) {
590 if (ctx->master || !ctx->afu->pp_psa) {
591 ctx->psn_phys = ctx->afu->psn_phys;
592 ctx->psn_size = ctx->afu->adapter->ps_size;
593 } else {
594 ctx->psn_phys = mmio_addr;
595 ctx->psn_size = mmio_size;
596 }
597 if (ctx->afu->pp_psa && mmio_size &&
598 ctx->afu->pp_size == 0) {
599 /*
600 * There's no property in the device tree to read the
601 * pp_size. We only find out at the 1st attach.
602 * Compared to bare-metal, it is too late and we
603 * should really lock here. However, on powerVM,
604 * pp_size is really only used to display in /sys.
605 * Being discussed with pHyp for their next release.
606 */
607 ctx->afu->pp_size = mmio_size;
608 }
609 /* from PAPR: process element is bytes 4-7 of process token */
610 ctx->external_pe = ctx->process_token & 0xFFFFFFFF;
611 pr_devel("CXL pe=%i is known as %i for pHyp, mmio_size=%#llx",
612 ctx->pe, ctx->external_pe, ctx->psn_size);
613 ctx->pe_inserted = true;
614 enable_afu_irqs(ctx);
615 }
616
617out_free:
618 free_page((u64)elem);
619 return rc;
620}
621
622static int guest_attach_process(struct cxl_context *ctx, bool kernel, u64 wed, u64 amr)
623{
624 pr_devel("in %s\n", __func__);
625
626 if (ctx->real_mode)
627 return -EPERM;
628
629 ctx->kernel = kernel;
630 if (ctx->afu->current_mode == CXL_MODE_DIRECTED)
631 return attach_afu_directed(ctx, wed, amr);
632
633 /* dedicated mode not supported on FW840 */
634
635 return -EINVAL;
636}
637
638static int detach_afu_directed(struct cxl_context *ctx)
639{
640 if (!ctx->pe_inserted)
641 return 0;
642 if (cxl_h_detach_process(ctx->afu->guest->handle, ctx->process_token))
643 return -1;
644 return 0;
645}
646
647static int guest_detach_process(struct cxl_context *ctx)
648{
649 pr_devel("in %s\n", __func__);
650 trace_cxl_detach(ctx);
651
652 if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
653 return -EIO;
654
655 if (ctx->afu->current_mode == CXL_MODE_DIRECTED)
656 return detach_afu_directed(ctx);
657
658 return -EINVAL;
659}
660
661static void guest_release_afu(struct device *dev)
662{
663 struct cxl_afu *afu = to_cxl_afu(dev);
664
665 pr_devel("%s\n", __func__);
666
667 idr_destroy(&afu->contexts_idr);
668
669 kfree(afu->guest);
670 kfree(afu);
671}
672
673ssize_t cxl_guest_read_afu_vpd(struct cxl_afu *afu, void *buf, size_t len)
674{
675 return guest_collect_vpd(NULL, afu, buf, len);
676}
677
678#define ERR_BUFF_MAX_COPY_SIZE PAGE_SIZE
679static ssize_t guest_afu_read_err_buffer(struct cxl_afu *afu, char *buf,
680 loff_t off, size_t count)
681{
682 void *tbuf = NULL;
683 int rc = 0;
684
685 tbuf = (void *) get_zeroed_page(GFP_KERNEL);
686 if (!tbuf)
687 return -ENOMEM;
688
689 rc = cxl_h_get_afu_err(afu->guest->handle,
690 off & 0x7,
691 virt_to_phys(tbuf),
692 count);
693 if (rc)
694 goto err;
695
696 if (count > ERR_BUFF_MAX_COPY_SIZE)
697 count = ERR_BUFF_MAX_COPY_SIZE - (off & 0x7);
698 memcpy(buf, tbuf, count);
699err:
700 free_page((u64)tbuf);
701
702 return rc;
703}
704
705static int guest_afu_check_and_enable(struct cxl_afu *afu)
706{
707 return 0;
708}
709
710static bool guest_support_attributes(const char *attr_name,
711 enum cxl_attrs type)
712{
713 switch (type) {
714 case CXL_ADAPTER_ATTRS:
715 if ((strcmp(attr_name, "base_image") == 0) ||
716 (strcmp(attr_name, "load_image_on_perst") == 0) ||
717 (strcmp(attr_name, "perst_reloads_same_image") == 0) ||
718 (strcmp(attr_name, "image_loaded") == 0))
719 return false;
720 break;
721 case CXL_AFU_MASTER_ATTRS:
722 if ((strcmp(attr_name, "pp_mmio_off") == 0))
723 return false;
724 break;
725 case CXL_AFU_ATTRS:
726 break;
727 default:
728 break;
729 }
730
731 return true;
732}
733
734static int activate_afu_directed(struct cxl_afu *afu)
735{
736 int rc;
737
738 dev_info(&afu->dev, "Activating AFU(%d) directed mode\n", afu->slice);
739
740 afu->current_mode = CXL_MODE_DIRECTED;
741
742 afu->num_procs = afu->max_procs_virtualised;
743
744 if ((rc = cxl_chardev_m_afu_add(afu)))
745 return rc;
746
747 if ((rc = cxl_sysfs_afu_m_add(afu)))
748 goto err;
749
750 if ((rc = cxl_chardev_s_afu_add(afu)))
751 goto err1;
752
753 return 0;
754err1:
755 cxl_sysfs_afu_m_remove(afu);
756err:
757 cxl_chardev_afu_remove(afu);
758 return rc;
759}
760
761static int guest_afu_activate_mode(struct cxl_afu *afu, int mode)
762{
763 if (!mode)
764 return 0;
765 if (!(mode & afu->modes_supported))
766 return -EINVAL;
767
768 if (mode == CXL_MODE_DIRECTED)
769 return activate_afu_directed(afu);
770
771 if (mode == CXL_MODE_DEDICATED)
772 dev_err(&afu->dev, "Dedicated mode not supported\n");
773
774 return -EINVAL;
775}
776
777static int deactivate_afu_directed(struct cxl_afu *afu)
778{
779 dev_info(&afu->dev, "Deactivating AFU(%d) directed mode\n", afu->slice);
780
781 afu->current_mode = 0;
782 afu->num_procs = 0;
783
784 cxl_sysfs_afu_m_remove(afu);
785 cxl_chardev_afu_remove(afu);
786
787 cxl_ops->afu_reset(afu);
788
789 return 0;
790}
791
792static int guest_afu_deactivate_mode(struct cxl_afu *afu, int mode)
793{
794 if (!mode)
795 return 0;
796 if (!(mode & afu->modes_supported))
797 return -EINVAL;
798
799 if (mode == CXL_MODE_DIRECTED)
800 return deactivate_afu_directed(afu);
801 return 0;
802}
803
804static int guest_afu_reset(struct cxl_afu *afu)
805{
806 pr_devel("AFU(%d) reset request\n", afu->slice);
807 return cxl_h_reset_afu(afu->guest->handle);
808}
809
810static int guest_map_slice_regs(struct cxl_afu *afu)
811{
812 if (!(afu->p2n_mmio = ioremap(afu->guest->p2n_phys, afu->guest->p2n_size))) {
813 dev_err(&afu->dev, "Error mapping AFU(%d) MMIO regions\n",
814 afu->slice);
815 return -ENOMEM;
816 }
817 return 0;
818}
819
820static void guest_unmap_slice_regs(struct cxl_afu *afu)
821{
822 if (afu->p2n_mmio)
823 iounmap(afu->p2n_mmio);
824}
825
826static int afu_update_state(struct cxl_afu *afu)
827{
828 int rc, cur_state;
829
830 rc = afu_read_error_state(afu, &cur_state);
831 if (rc)
832 return rc;
833
834 if (afu->guest->previous_state == cur_state)
835 return 0;
836
837 pr_devel("AFU(%d) update state to %#x\n", afu->slice, cur_state);
838
839 switch (cur_state) {
840 case H_STATE_NORMAL:
841 afu->guest->previous_state = cur_state;
842 break;
843
844 case H_STATE_DISABLE:
845 pci_error_handlers(afu, CXL_ERROR_DETECTED_EVENT,
846 pci_channel_io_frozen);
847
848 cxl_context_detach_all(afu);
849 if ((rc = cxl_ops->afu_reset(afu)))
850 pr_devel("reset hcall failed %d\n", rc);
851
852 rc = afu_read_error_state(afu, &cur_state);
853 if (!rc && cur_state == H_STATE_NORMAL) {
854 pci_error_handlers(afu, CXL_SLOT_RESET_EVENT,
855 pci_channel_io_normal);
856 pci_error_handlers(afu, CXL_RESUME_EVENT, 0);
857 }
858 afu->guest->previous_state = 0;
859 break;
860
861 case H_STATE_TEMP_UNAVAILABLE:
862 afu->guest->previous_state = cur_state;
863 break;
864
865 case H_STATE_PERM_UNAVAILABLE:
866 dev_err(&afu->dev, "AFU is in permanent error state\n");
867 pci_error_handlers(afu, CXL_ERROR_DETECTED_EVENT,
868 pci_channel_io_perm_failure);
869 afu->guest->previous_state = cur_state;
870 break;
871
872 default:
873 pr_err("Unexpected AFU(%d) error state: %#x\n",
874 afu->slice, cur_state);
875 return -EINVAL;
876 }
877
878 return rc;
879}
880
881static void afu_handle_errstate(struct work_struct *work)
882{
883 struct cxl_afu_guest *afu_guest =
884 container_of(to_delayed_work(work), struct cxl_afu_guest, work_err);
885
886 if (!afu_update_state(afu_guest->parent) &&
887 afu_guest->previous_state == H_STATE_PERM_UNAVAILABLE)
888 return;
889
890 if (afu_guest->handle_err)
891 schedule_delayed_work(&afu_guest->work_err,
892 msecs_to_jiffies(3000));
893}
894
895static bool guest_link_ok(struct cxl *cxl, struct cxl_afu *afu)
896{
897 int state;
898
899 if (afu && (!afu_read_error_state(afu, &state))) {
900 if (state == H_STATE_NORMAL)
901 return true;
902 }
903
904 return false;
905}
906
907static int afu_properties_look_ok(struct cxl_afu *afu)
908{
909 if (afu->pp_irqs < 0) {
910 dev_err(&afu->dev, "Unexpected per-process minimum interrupt value\n");
911 return -EINVAL;
912 }
913
914 if (afu->max_procs_virtualised < 1) {
915 dev_err(&afu->dev, "Unexpected max number of processes virtualised value\n");
916 return -EINVAL;
917 }
918
919 if (afu->crs_len < 0) {
920 dev_err(&afu->dev, "Unexpected configuration record size value\n");
921 return -EINVAL;
922 }
923
924 return 0;
925}
926
927int cxl_guest_init_afu(struct cxl *adapter, int slice, struct device_node *afu_np)
928{
929 struct cxl_afu *afu;
930 bool free = true;
931 int rc;
932
933 pr_devel("in %s - AFU(%d)\n", __func__, slice);
934 if (!(afu = cxl_alloc_afu(adapter, slice)))
935 return -ENOMEM;
936
937 if (!(afu->guest = kzalloc(sizeof(struct cxl_afu_guest), GFP_KERNEL))) {
938 kfree(afu);
939 return -ENOMEM;
940 }
941
942 if ((rc = dev_set_name(&afu->dev, "afu%i.%i",
943 adapter->adapter_num,
944 slice)))
945 goto err1;
946
947 adapter->slices++;
948
949 if ((rc = cxl_of_read_afu_handle(afu, afu_np)))
950 goto err1;
951
952 if ((rc = cxl_ops->afu_reset(afu)))
953 goto err1;
954
955 if ((rc = cxl_of_read_afu_properties(afu, afu_np)))
956 goto err1;
957
958 if ((rc = afu_properties_look_ok(afu)))
959 goto err1;
960
961 if ((rc = guest_map_slice_regs(afu)))
962 goto err1;
963
964 if ((rc = guest_register_serr_irq(afu)))
965 goto err2;
966
967 /*
968 * After we call this function we must not free the afu directly, even
969 * if it returns an error!
970 */
971 if ((rc = cxl_register_afu(afu)))
972 goto err_put1;
973
974 if ((rc = cxl_sysfs_afu_add(afu)))
975 goto err_put1;
976
977 /*
978 * pHyp doesn't expose the programming models supported by the
979 * AFU. pHyp currently only supports directed mode. If it adds
980 * dedicated mode later, this version of cxl has no way to
981 * detect it. So we'll initialize the driver, but the first
982 * attach will fail.
983 * Being discussed with pHyp to do better (likely new property)
984 */
985 if (afu->max_procs_virtualised == 1)
986 afu->modes_supported = CXL_MODE_DEDICATED;
987 else
988 afu->modes_supported = CXL_MODE_DIRECTED;
989
990 if ((rc = cxl_afu_select_best_mode(afu)))
991 goto err_put2;
992
993 adapter->afu[afu->slice] = afu;
994
995 afu->enabled = true;
996
997 /*
998 * wake up the cpu periodically to check the state
999 * of the AFU using "afu" stored in the guest structure.
1000 */
1001 afu->guest->parent = afu;
1002 afu->guest->handle_err = true;
1003 INIT_DELAYED_WORK(&afu->guest->work_err, afu_handle_errstate);
1004 schedule_delayed_work(&afu->guest->work_err, msecs_to_jiffies(1000));
1005
1006 if ((rc = cxl_pci_vphb_add(afu)))
1007 dev_info(&afu->dev, "Can't register vPHB\n");
1008
1009 return 0;
1010
1011err_put2:
1012 cxl_sysfs_afu_remove(afu);
1013err_put1:
1014 device_unregister(&afu->dev);
1015 free = false;
1016 guest_release_serr_irq(afu);
1017err2:
1018 guest_unmap_slice_regs(afu);
1019err1:
1020 if (free) {
1021 kfree(afu->guest);
1022 kfree(afu);
1023 }
1024 return rc;
1025}
1026
1027void cxl_guest_remove_afu(struct cxl_afu *afu)
1028{
1029 pr_devel("in %s - AFU(%d)\n", __func__, afu->slice);
1030
1031 if (!afu)
1032 return;
1033
1034 /* flush and stop pending job */
1035 afu->guest->handle_err = false;
1036 flush_delayed_work(&afu->guest->work_err);
1037
1038 cxl_pci_vphb_remove(afu);
1039 cxl_sysfs_afu_remove(afu);
1040
1041 spin_lock(&afu->adapter->afu_list_lock);
1042 afu->adapter->afu[afu->slice] = NULL;
1043 spin_unlock(&afu->adapter->afu_list_lock);
1044
1045 cxl_context_detach_all(afu);
1046 cxl_ops->afu_deactivate_mode(afu, afu->current_mode);
1047 guest_release_serr_irq(afu);
1048 guest_unmap_slice_regs(afu);
1049
1050 device_unregister(&afu->dev);
1051}
1052
1053static void free_adapter(struct cxl *adapter)
1054{
1055 struct irq_avail *cur;
1056 int i;
1057
1058 if (adapter->guest) {
1059 if (adapter->guest->irq_avail) {
1060 for (i = 0; i < adapter->guest->irq_nranges; i++) {
1061 cur = &adapter->guest->irq_avail[i];
1062 kfree(cur->bitmap);
1063 }
1064 kfree(adapter->guest->irq_avail);
1065 }
1066 kfree(adapter->guest->status);
1067 kfree(adapter->guest);
1068 }
1069 cxl_remove_adapter_nr(adapter);
1070 kfree(adapter);
1071}
1072
1073static int properties_look_ok(struct cxl *adapter)
1074{
1075 /* The absence of this property means that the operational
1076 * status is unknown or okay
1077 */
1078 if (strlen(adapter->guest->status) &&
1079 strcmp(adapter->guest->status, "okay")) {
1080 pr_err("ABORTING:Bad operational status of the device\n");
1081 return -EINVAL;
1082 }
1083
1084 return 0;
1085}
1086
1087ssize_t cxl_guest_read_adapter_vpd(struct cxl *adapter, void *buf, size_t len)
1088{
1089 return guest_collect_vpd(adapter, NULL, buf, len);
1090}
1091
1092void cxl_guest_remove_adapter(struct cxl *adapter)
1093{
1094 pr_devel("in %s\n", __func__);
1095
1096 cxl_sysfs_adapter_remove(adapter);
1097
1098 cxl_guest_remove_chardev(adapter);
1099 device_unregister(&adapter->dev);
1100}
1101
1102static void release_adapter(struct device *dev)
1103{
1104 free_adapter(to_cxl_adapter(dev));
1105}
1106
1107struct cxl *cxl_guest_init_adapter(struct device_node *np, struct platform_device *pdev)
1108{
1109 struct cxl *adapter;
1110 bool free = true;
1111 int rc;
1112
1113 if (!(adapter = cxl_alloc_adapter()))
1114 return ERR_PTR(-ENOMEM);
1115
1116 if (!(adapter->guest = kzalloc(sizeof(struct cxl_guest), GFP_KERNEL))) {
1117 free_adapter(adapter);
1118 return ERR_PTR(-ENOMEM);
1119 }
1120
1121 adapter->slices = 0;
1122 adapter->guest->pdev = pdev;
1123 adapter->dev.parent = &pdev->dev;
1124 adapter->dev.release = release_adapter;
1125 dev_set_drvdata(&pdev->dev, adapter);
1126
1127 /*
1128 * Hypervisor controls PSL timebase initialization (p1 register).
1129 * On FW840, PSL is initialized.
1130 */
1131 adapter->psl_timebase_synced = true;
1132
1133 if ((rc = cxl_of_read_adapter_handle(adapter, np)))
1134 goto err1;
1135
1136 if ((rc = cxl_of_read_adapter_properties(adapter, np)))
1137 goto err1;
1138
1139 if ((rc = properties_look_ok(adapter)))
1140 goto err1;
1141
1142 if ((rc = cxl_guest_add_chardev(adapter)))
1143 goto err1;
1144
1145 /*
1146 * After we call this function we must not free the adapter directly,
1147 * even if it returns an error!
1148 */
1149 if ((rc = cxl_register_adapter(adapter)))
1150 goto err_put1;
1151
1152 if ((rc = cxl_sysfs_adapter_add(adapter)))
1153 goto err_put1;
1154
1155 /* release the context lock as the adapter is configured */
1156 cxl_adapter_context_unlock(adapter);
1157
1158 return adapter;
1159
1160err_put1:
1161 device_unregister(&adapter->dev);
1162 free = false;
1163 cxl_guest_remove_chardev(adapter);
1164err1:
1165 if (free)
1166 free_adapter(adapter);
1167 return ERR_PTR(rc);
1168}
1169
1170void cxl_guest_reload_module(struct cxl *adapter)
1171{
1172 struct platform_device *pdev;
1173
1174 pdev = adapter->guest->pdev;
1175 cxl_guest_remove_adapter(adapter);
1176
1177 cxl_of_probe(pdev);
1178}
1179
1180const struct cxl_backend_ops cxl_guest_ops = {
1181 .module = THIS_MODULE,
1182 .adapter_reset = guest_reset,
1183 .alloc_one_irq = guest_alloc_one_irq,
1184 .release_one_irq = guest_release_one_irq,
1185 .alloc_irq_ranges = guest_alloc_irq_ranges,
1186 .release_irq_ranges = guest_release_irq_ranges,
1187 .setup_irq = NULL,
1188 .handle_psl_slice_error = guest_handle_psl_slice_error,
1189 .psl_interrupt = guest_psl_irq,
1190 .ack_irq = guest_ack_irq,
1191 .attach_process = guest_attach_process,
1192 .detach_process = guest_detach_process,
1193 .update_ivtes = NULL,
1194 .support_attributes = guest_support_attributes,
1195 .link_ok = guest_link_ok,
1196 .release_afu = guest_release_afu,
1197 .afu_read_err_buffer = guest_afu_read_err_buffer,
1198 .afu_check_and_enable = guest_afu_check_and_enable,
1199 .afu_activate_mode = guest_afu_activate_mode,
1200 .afu_deactivate_mode = guest_afu_deactivate_mode,
1201 .afu_reset = guest_afu_reset,
1202 .afu_cr_read8 = guest_afu_cr_read8,
1203 .afu_cr_read16 = guest_afu_cr_read16,
1204 .afu_cr_read32 = guest_afu_cr_read32,
1205 .afu_cr_read64 = guest_afu_cr_read64,
1206 .afu_cr_write8 = guest_afu_cr_write8,
1207 .afu_cr_write16 = guest_afu_cr_write16,
1208 .afu_cr_write32 = guest_afu_cr_write32,
1209 .read_adapter_vpd = cxl_guest_read_adapter_vpd,
1210};