This source file includes following definitions.
- update_uid_checking
- zpci_err_clp
- clp_get_ilp
- clp_req
- clp_alloc_block
- clp_free_block
- clp_store_query_pci_fngrp
- clp_query_pci_fngrp
- clp_store_query_pci_fn
- clp_query_pci_fn
- clp_add_pci_device
- clp_set_pci_fn
- clp_enable_fh
- clp_disable_fh
- clp_list_pci
- __clp_add
- __clp_update
- clp_scan_pci_devices
- clp_rescan_pci_devices
- clp_rescan_pci_devices_simple
- __clp_get_state
- clp_get_state
- clp_base_slpc
- clp_base_command
- clp_pci_slpc
- clp_pci_list
- clp_pci_query
- clp_pci_query_grp
- clp_pci_command
- clp_normal_command
- clp_immediate_command
- clp_misc_ioctl
- clp_misc_release
- clp_misc_init
1
2
3
4
5
6
7
8
9 #define KMSG_COMPONENT "zpci"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include <linux/compat.h>
13 #include <linux/kernel.h>
14 #include <linux/miscdevice.h>
15 #include <linux/slab.h>
16 #include <linux/err.h>
17 #include <linux/delay.h>
18 #include <linux/pci.h>
19 #include <linux/uaccess.h>
20 #include <asm/pci_debug.h>
21 #include <asm/pci_clp.h>
22 #include <asm/clp.h>
23 #include <uapi/asm/clp.h>
24
25 bool zpci_unique_uid;
26
27 static void update_uid_checking(bool new)
28 {
29 if (zpci_unique_uid != new)
30 zpci_dbg(1, "uid checking:%d\n", new);
31
32 zpci_unique_uid = new;
33 }
34
35 static inline void zpci_err_clp(unsigned int rsp, int rc)
36 {
37 struct {
38 unsigned int rsp;
39 int rc;
40 } __packed data = {rsp, rc};
41
42 zpci_err_hex(&data, sizeof(data));
43 }
44
45
46
47
48
49 static inline int clp_get_ilp(unsigned long *ilp)
50 {
51 unsigned long mask;
52 int cc = 3;
53
54 asm volatile (
55 " .insn rrf,0xb9a00000,%[mask],%[cmd],8,0\n"
56 "0: ipm %[cc]\n"
57 " srl %[cc],28\n"
58 "1:\n"
59 EX_TABLE(0b, 1b)
60 : [cc] "+d" (cc), [mask] "=d" (mask) : [cmd] "a" (1)
61 : "cc");
62 *ilp = mask;
63 return cc;
64 }
65
66
67
68
69 static __always_inline int clp_req(void *data, unsigned int lps)
70 {
71 struct { u8 _[CLP_BLK_SIZE]; } *req = data;
72 u64 ignored;
73 int cc = 3;
74
75 asm volatile (
76 " .insn rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n"
77 "0: ipm %[cc]\n"
78 " srl %[cc],28\n"
79 "1:\n"
80 EX_TABLE(0b, 1b)
81 : [cc] "+d" (cc), [ign] "=d" (ignored), "+m" (*req)
82 : [req] "a" (req), [lps] "i" (lps)
83 : "cc");
84 return cc;
85 }
86
87 static void *clp_alloc_block(gfp_t gfp_mask)
88 {
89 return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
90 }
91
92 static void clp_free_block(void *ptr)
93 {
94 free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
95 }
96
97 static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
98 struct clp_rsp_query_pci_grp *response)
99 {
100 zdev->tlb_refresh = response->refresh;
101 zdev->dma_mask = response->dasm;
102 zdev->msi_addr = response->msia;
103 zdev->max_msi = response->noi;
104 zdev->fmb_update = response->mui;
105
106 switch (response->version) {
107 case 1:
108 zdev->max_bus_speed = PCIE_SPEED_5_0GT;
109 break;
110 default:
111 zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
112 break;
113 }
114 }
115
116 static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
117 {
118 struct clp_req_rsp_query_pci_grp *rrb;
119 int rc;
120
121 rrb = clp_alloc_block(GFP_KERNEL);
122 if (!rrb)
123 return -ENOMEM;
124
125 memset(rrb, 0, sizeof(*rrb));
126 rrb->request.hdr.len = sizeof(rrb->request);
127 rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
128 rrb->response.hdr.len = sizeof(rrb->response);
129 rrb->request.pfgid = pfgid;
130
131 rc = clp_req(rrb, CLP_LPS_PCI);
132 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
133 clp_store_query_pci_fngrp(zdev, &rrb->response);
134 else {
135 zpci_err("Q PCI FGRP:\n");
136 zpci_err_clp(rrb->response.hdr.rsp, rc);
137 rc = -EIO;
138 }
139 clp_free_block(rrb);
140 return rc;
141 }
142
143 static int clp_store_query_pci_fn(struct zpci_dev *zdev,
144 struct clp_rsp_query_pci *response)
145 {
146 int i;
147
148 for (i = 0; i < PCI_BAR_COUNT; i++) {
149 zdev->bars[i].val = le32_to_cpu(response->bar[i]);
150 zdev->bars[i].size = response->bar_size[i];
151 }
152 zdev->start_dma = response->sdma;
153 zdev->end_dma = response->edma;
154 zdev->pchid = response->pchid;
155 zdev->pfgid = response->pfgid;
156 zdev->pft = response->pft;
157 zdev->vfn = response->vfn;
158 zdev->uid = response->uid;
159 zdev->fmb_length = sizeof(u32) * response->fmb_len;
160
161 memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
162 if (response->util_str_avail) {
163 memcpy(zdev->util_str, response->util_str,
164 sizeof(zdev->util_str));
165 }
166 zdev->mio_capable = response->mio_addr_avail;
167 for (i = 0; i < PCI_BAR_COUNT; i++) {
168 if (!(response->mio.valid & (1 << (PCI_BAR_COUNT - i - 1))))
169 continue;
170
171 zdev->bars[i].mio_wb = (void __iomem *) response->mio.addr[i].wb;
172 zdev->bars[i].mio_wt = (void __iomem *) response->mio.addr[i].wt;
173 }
174 return 0;
175 }
176
177 static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
178 {
179 struct clp_req_rsp_query_pci *rrb;
180 int rc;
181
182 rrb = clp_alloc_block(GFP_KERNEL);
183 if (!rrb)
184 return -ENOMEM;
185
186 memset(rrb, 0, sizeof(*rrb));
187 rrb->request.hdr.len = sizeof(rrb->request);
188 rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
189 rrb->response.hdr.len = sizeof(rrb->response);
190 rrb->request.fh = fh;
191
192 rc = clp_req(rrb, CLP_LPS_PCI);
193 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
194 rc = clp_store_query_pci_fn(zdev, &rrb->response);
195 if (rc)
196 goto out;
197 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
198 } else {
199 zpci_err("Q PCI FN:\n");
200 zpci_err_clp(rrb->response.hdr.rsp, rc);
201 rc = -EIO;
202 }
203 out:
204 clp_free_block(rrb);
205 return rc;
206 }
207
208 int clp_add_pci_device(u32 fid, u32 fh, int configured)
209 {
210 struct zpci_dev *zdev;
211 int rc = -ENOMEM;
212
213 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
214 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
215 if (!zdev)
216 goto error;
217
218 zdev->fh = fh;
219 zdev->fid = fid;
220
221
222 rc = clp_query_pci_fn(zdev, fh);
223 if (rc)
224 goto error;
225
226 if (configured)
227 zdev->state = ZPCI_FN_STATE_CONFIGURED;
228 else
229 zdev->state = ZPCI_FN_STATE_STANDBY;
230
231 rc = zpci_create_device(zdev);
232 if (rc)
233 goto error;
234 return 0;
235
236 error:
237 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
238 kfree(zdev);
239 return rc;
240 }
241
242
243
244
245
246 static int clp_set_pci_fn(struct zpci_dev *zdev, u8 nr_dma_as, u8 command)
247 {
248 struct clp_req_rsp_set_pci *rrb;
249 int rc, retries = 100;
250 u32 fid = zdev->fid;
251
252 rrb = clp_alloc_block(GFP_KERNEL);
253 if (!rrb)
254 return -ENOMEM;
255
256 do {
257 memset(rrb, 0, sizeof(*rrb));
258 rrb->request.hdr.len = sizeof(rrb->request);
259 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
260 rrb->response.hdr.len = sizeof(rrb->response);
261 rrb->request.fh = zdev->fh;
262 rrb->request.oc = command;
263 rrb->request.ndas = nr_dma_as;
264
265 rc = clp_req(rrb, CLP_LPS_PCI);
266 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
267 retries--;
268 if (retries < 0)
269 break;
270 msleep(20);
271 }
272 } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
273
274 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
275 zpci_err("Set PCI FN:\n");
276 zpci_err_clp(rrb->response.hdr.rsp, rc);
277 }
278
279 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
280 zdev->fh = rrb->response.fh;
281 } else if (!rc && rrb->response.hdr.rsp == CLP_RC_SETPCIFN_ALRDY &&
282 rrb->response.fh == 0) {
283
284 rc = clp_rescan_pci_devices_simple(&fid);
285 }
286 clp_free_block(rrb);
287 return rc;
288 }
289
290 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
291 {
292 int rc;
293
294 rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
295 zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
296 if (rc)
297 goto out;
298
299 if (zpci_use_mio(zdev)) {
300 rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_MIO);
301 zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n",
302 zdev->fid, zdev->fh, rc);
303 if (rc)
304 clp_disable_fh(zdev);
305 }
306 out:
307 return rc;
308 }
309
310 int clp_disable_fh(struct zpci_dev *zdev)
311 {
312 int rc;
313
314 if (!zdev_enabled(zdev))
315 return 0;
316
317 rc = clp_set_pci_fn(zdev, 0, CLP_SET_DISABLE_PCI_FN);
318 zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
319 return rc;
320 }
321
322 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
323 void (*cb)(struct clp_fh_list_entry *, void *))
324 {
325 u64 resume_token = 0;
326 int entries, i, rc;
327
328 do {
329 memset(rrb, 0, sizeof(*rrb));
330 rrb->request.hdr.len = sizeof(rrb->request);
331 rrb->request.hdr.cmd = CLP_LIST_PCI;
332
333 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
334 rrb->request.resume_token = resume_token;
335
336
337 rc = clp_req(rrb, CLP_LPS_PCI);
338 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
339 zpci_err("List PCI FN:\n");
340 zpci_err_clp(rrb->response.hdr.rsp, rc);
341 rc = -EIO;
342 goto out;
343 }
344
345 update_uid_checking(rrb->response.uid_checking);
346 WARN_ON_ONCE(rrb->response.entry_size !=
347 sizeof(struct clp_fh_list_entry));
348
349 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
350 rrb->response.entry_size;
351
352 resume_token = rrb->response.resume_token;
353 for (i = 0; i < entries; i++)
354 cb(&rrb->response.fh_list[i], data);
355 } while (resume_token);
356 out:
357 return rc;
358 }
359
360 static void __clp_add(struct clp_fh_list_entry *entry, void *data)
361 {
362 struct zpci_dev *zdev;
363
364 if (!entry->vendor_id)
365 return;
366
367 zdev = get_zdev_by_fid(entry->fid);
368 if (!zdev)
369 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
370 }
371
372 static void __clp_update(struct clp_fh_list_entry *entry, void *data)
373 {
374 struct zpci_dev *zdev;
375 u32 *fid = data;
376
377 if (!entry->vendor_id)
378 return;
379
380 if (fid && *fid != entry->fid)
381 return;
382
383 zdev = get_zdev_by_fid(entry->fid);
384 if (!zdev)
385 return;
386
387 zdev->fh = entry->fh;
388 }
389
390 int clp_scan_pci_devices(void)
391 {
392 struct clp_req_rsp_list_pci *rrb;
393 int rc;
394
395 rrb = clp_alloc_block(GFP_KERNEL);
396 if (!rrb)
397 return -ENOMEM;
398
399 rc = clp_list_pci(rrb, NULL, __clp_add);
400
401 clp_free_block(rrb);
402 return rc;
403 }
404
405 int clp_rescan_pci_devices(void)
406 {
407 struct clp_req_rsp_list_pci *rrb;
408 int rc;
409
410 zpci_remove_reserved_devices();
411
412 rrb = clp_alloc_block(GFP_KERNEL);
413 if (!rrb)
414 return -ENOMEM;
415
416 rc = clp_list_pci(rrb, NULL, __clp_add);
417
418 clp_free_block(rrb);
419 return rc;
420 }
421
422
423
424
425 int clp_rescan_pci_devices_simple(u32 *fid)
426 {
427 struct clp_req_rsp_list_pci *rrb;
428 int rc;
429
430 rrb = clp_alloc_block(GFP_NOWAIT);
431 if (!rrb)
432 return -ENOMEM;
433
434 rc = clp_list_pci(rrb, fid, __clp_update);
435
436 clp_free_block(rrb);
437 return rc;
438 }
439
440 struct clp_state_data {
441 u32 fid;
442 enum zpci_state state;
443 };
444
445 static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
446 {
447 struct clp_state_data *sd = data;
448
449 if (entry->fid != sd->fid)
450 return;
451
452 sd->state = entry->config_state;
453 }
454
455 int clp_get_state(u32 fid, enum zpci_state *state)
456 {
457 struct clp_req_rsp_list_pci *rrb;
458 struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
459 int rc;
460
461 rrb = clp_alloc_block(GFP_ATOMIC);
462 if (!rrb)
463 return -ENOMEM;
464
465 rc = clp_list_pci(rrb, &sd, __clp_get_state);
466 if (!rc)
467 *state = sd.state;
468
469 clp_free_block(rrb);
470 return rc;
471 }
472
473 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
474 {
475 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
476
477 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
478 lpcb->response.hdr.len > limit)
479 return -EINVAL;
480 return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
481 }
482
483 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
484 {
485 switch (lpcb->cmd) {
486 case 0x0001:
487 return clp_base_slpc(req, (void *) lpcb);
488 default:
489 return -EINVAL;
490 }
491 }
492
493 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
494 {
495 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
496
497 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
498 lpcb->response.hdr.len > limit)
499 return -EINVAL;
500 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
501 }
502
503 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
504 {
505 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
506
507 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
508 lpcb->response.hdr.len > limit)
509 return -EINVAL;
510 if (lpcb->request.reserved2 != 0)
511 return -EINVAL;
512 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
513 }
514
515 static int clp_pci_query(struct clp_req *req,
516 struct clp_req_rsp_query_pci *lpcb)
517 {
518 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
519
520 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
521 lpcb->response.hdr.len > limit)
522 return -EINVAL;
523 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
524 return -EINVAL;
525 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
526 }
527
528 static int clp_pci_query_grp(struct clp_req *req,
529 struct clp_req_rsp_query_pci_grp *lpcb)
530 {
531 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
532
533 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
534 lpcb->response.hdr.len > limit)
535 return -EINVAL;
536 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
537 lpcb->request.reserved4 != 0)
538 return -EINVAL;
539 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
540 }
541
542 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
543 {
544 switch (lpcb->cmd) {
545 case 0x0001:
546 return clp_pci_slpc(req, (void *) lpcb);
547 case 0x0002:
548 return clp_pci_list(req, (void *) lpcb);
549 case 0x0003:
550 return clp_pci_query(req, (void *) lpcb);
551 case 0x0004:
552 return clp_pci_query_grp(req, (void *) lpcb);
553 default:
554 return -EINVAL;
555 }
556 }
557
558 static int clp_normal_command(struct clp_req *req)
559 {
560 struct clp_req_hdr *lpcb;
561 void __user *uptr;
562 int rc;
563
564 rc = -EINVAL;
565 if (req->lps != 0 && req->lps != 2)
566 goto out;
567
568 rc = -ENOMEM;
569 lpcb = clp_alloc_block(GFP_KERNEL);
570 if (!lpcb)
571 goto out;
572
573 rc = -EFAULT;
574 uptr = (void __force __user *)(unsigned long) req->data_p;
575 if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
576 goto out_free;
577
578 rc = -EINVAL;
579 if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
580 goto out_free;
581
582 switch (req->lps) {
583 case 0:
584 rc = clp_base_command(req, lpcb);
585 break;
586 case 2:
587 rc = clp_pci_command(req, lpcb);
588 break;
589 }
590 if (rc)
591 goto out_free;
592
593 rc = -EFAULT;
594 if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
595 goto out_free;
596
597 rc = 0;
598
599 out_free:
600 clp_free_block(lpcb);
601 out:
602 return rc;
603 }
604
605 static int clp_immediate_command(struct clp_req *req)
606 {
607 void __user *uptr;
608 unsigned long ilp;
609 int exists;
610
611 if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
612 return -EINVAL;
613
614 uptr = (void __force __user *)(unsigned long) req->data_p;
615 if (req->cmd == 0) {
616
617 exists = test_bit_inv(req->lps, &ilp);
618 return put_user(exists, (int __user *) uptr);
619 }
620
621 return put_user(ilp, (unsigned long __user *) uptr);
622 }
623
624 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
625 unsigned long arg)
626 {
627 struct clp_req req;
628 void __user *argp;
629
630 if (cmd != CLP_SYNC)
631 return -EINVAL;
632
633 argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
634 if (copy_from_user(&req, argp, sizeof(req)))
635 return -EFAULT;
636 if (req.r != 0)
637 return -EINVAL;
638 return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
639 }
640
641 static int clp_misc_release(struct inode *inode, struct file *filp)
642 {
643 return 0;
644 }
645
646 static const struct file_operations clp_misc_fops = {
647 .owner = THIS_MODULE,
648 .open = nonseekable_open,
649 .release = clp_misc_release,
650 .unlocked_ioctl = clp_misc_ioctl,
651 .compat_ioctl = clp_misc_ioctl,
652 .llseek = no_llseek,
653 };
654
655 static struct miscdevice clp_misc_device = {
656 .minor = MISC_DYNAMIC_MINOR,
657 .name = "clp",
658 .fops = &clp_misc_fops,
659 };
660
661 static int __init clp_misc_init(void)
662 {
663 return misc_register(&clp_misc_device);
664 }
665
666 device_initcall(clp_misc_init);