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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
25bool zpci_unique_uid;
26
27void 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
35static 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
49static 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
69static 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
87static void *clp_alloc_block(gfp_t gfp_mask)
88{
89 return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
90}
91
92static void clp_free_block(void *ptr)
93{
94 free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
95}
96
97static 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 zdev->version = response->version;
106
107 switch (response->version) {
108 case 1:
109 zdev->max_bus_speed = PCIE_SPEED_5_0GT;
110 break;
111 default:
112 zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
113 break;
114 }
115}
116
117static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
118{
119 struct clp_req_rsp_query_pci_grp *rrb;
120 int rc;
121
122 rrb = clp_alloc_block(GFP_KERNEL);
123 if (!rrb)
124 return -ENOMEM;
125
126 memset(rrb, 0, sizeof(*rrb));
127 rrb->request.hdr.len = sizeof(rrb->request);
128 rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
129 rrb->response.hdr.len = sizeof(rrb->response);
130 rrb->request.pfgid = pfgid;
131
132 rc = clp_req(rrb, CLP_LPS_PCI);
133 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
134 clp_store_query_pci_fngrp(zdev, &rrb->response);
135 else {
136 zpci_err("Q PCI FGRP:\n");
137 zpci_err_clp(rrb->response.hdr.rsp, rc);
138 rc = -EIO;
139 }
140 clp_free_block(rrb);
141 return rc;
142}
143
144static int clp_store_query_pci_fn(struct zpci_dev *zdev,
145 struct clp_rsp_query_pci *response)
146{
147 int i;
148
149 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
150 zdev->bars[i].val = le32_to_cpu(response->bar[i]);
151 zdev->bars[i].size = response->bar_size[i];
152 }
153 zdev->start_dma = response->sdma;
154 zdev->end_dma = response->edma;
155 zdev->pchid = response->pchid;
156 zdev->pfgid = response->pfgid;
157 zdev->pft = response->pft;
158 zdev->vfn = response->vfn;
159 zdev->port = response->port;
160 zdev->uid = response->uid;
161 zdev->fmb_length = sizeof(u32) * response->fmb_len;
162 zdev->rid_available = response->rid_avail;
163 zdev->is_physfn = response->is_physfn;
164 if (!s390_pci_no_rid && zdev->rid_available)
165 zdev->devfn = response->rid & ZPCI_RID_MASK_DEVFN;
166
167 memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
168 if (response->util_str_avail) {
169 memcpy(zdev->util_str, response->util_str,
170 sizeof(zdev->util_str));
171 zdev->util_str_avail = 1;
172 }
173 zdev->mio_capable = response->mio_addr_avail;
174 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
175 if (!(response->mio.valid & (1 << (PCI_STD_NUM_BARS - i - 1))))
176 continue;
177
178 zdev->bars[i].mio_wb = (void __iomem *) response->mio.addr[i].wb;
179 zdev->bars[i].mio_wt = (void __iomem *) response->mio.addr[i].wt;
180 }
181 return 0;
182}
183
184static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
185{
186 struct clp_req_rsp_query_pci *rrb;
187 int rc;
188
189 rrb = clp_alloc_block(GFP_KERNEL);
190 if (!rrb)
191 return -ENOMEM;
192
193 memset(rrb, 0, sizeof(*rrb));
194 rrb->request.hdr.len = sizeof(rrb->request);
195 rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
196 rrb->response.hdr.len = sizeof(rrb->response);
197 rrb->request.fh = fh;
198
199 rc = clp_req(rrb, CLP_LPS_PCI);
200 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
201 rc = clp_store_query_pci_fn(zdev, &rrb->response);
202 if (rc)
203 goto out;
204 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
205 } else {
206 zpci_err("Q PCI FN:\n");
207 zpci_err_clp(rrb->response.hdr.rsp, rc);
208 rc = -EIO;
209 }
210out:
211 clp_free_block(rrb);
212 return rc;
213}
214
215int clp_add_pci_device(u32 fid, u32 fh, int configured)
216{
217 struct zpci_dev *zdev;
218 int rc = -ENOMEM;
219
220 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
221 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
222 if (!zdev)
223 goto error;
224
225 zdev->fh = fh;
226 zdev->fid = fid;
227
228
229 rc = clp_query_pci_fn(zdev, fh);
230 if (rc)
231 goto error;
232
233 if (configured)
234 zdev->state = ZPCI_FN_STATE_CONFIGURED;
235 else
236 zdev->state = ZPCI_FN_STATE_STANDBY;
237
238 rc = zpci_create_device(zdev);
239 if (rc)
240 goto error;
241 return 0;
242
243error:
244 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
245 kfree(zdev);
246 return rc;
247}
248
249
250
251
252
253static int clp_set_pci_fn(struct zpci_dev *zdev, u8 nr_dma_as, u8 command)
254{
255 struct clp_req_rsp_set_pci *rrb;
256 int rc, retries = 100;
257 u32 fid = zdev->fid;
258
259 rrb = clp_alloc_block(GFP_KERNEL);
260 if (!rrb)
261 return -ENOMEM;
262
263 do {
264 memset(rrb, 0, sizeof(*rrb));
265 rrb->request.hdr.len = sizeof(rrb->request);
266 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
267 rrb->response.hdr.len = sizeof(rrb->response);
268 rrb->request.fh = zdev->fh;
269 rrb->request.oc = command;
270 rrb->request.ndas = nr_dma_as;
271
272 rc = clp_req(rrb, CLP_LPS_PCI);
273 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
274 retries--;
275 if (retries < 0)
276 break;
277 msleep(20);
278 }
279 } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
280
281 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
282 zpci_err("Set PCI FN:\n");
283 zpci_err_clp(rrb->response.hdr.rsp, rc);
284 }
285
286 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
287 zdev->fh = rrb->response.fh;
288 } else if (!rc && rrb->response.hdr.rsp == CLP_RC_SETPCIFN_ALRDY &&
289 rrb->response.fh == 0) {
290
291 rc = clp_rescan_pci_devices_simple(&fid);
292 }
293 clp_free_block(rrb);
294 return rc;
295}
296
297int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
298{
299 int rc;
300
301 rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
302 zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
303 if (rc)
304 goto out;
305
306 if (zpci_use_mio(zdev)) {
307 rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_MIO);
308 zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n",
309 zdev->fid, zdev->fh, rc);
310 if (rc)
311 clp_disable_fh(zdev);
312 }
313out:
314 return rc;
315}
316
317int clp_disable_fh(struct zpci_dev *zdev)
318{
319 u32 fh = zdev->fh;
320 int rc;
321
322 if (!zdev_enabled(zdev))
323 return 0;
324
325 rc = clp_set_pci_fn(zdev, 0, CLP_SET_DISABLE_PCI_FN);
326 zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
327 return rc;
328}
329
330static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
331 void (*cb)(struct clp_fh_list_entry *, void *))
332{
333 u64 resume_token = 0;
334 int entries, i, rc;
335
336 do {
337 memset(rrb, 0, sizeof(*rrb));
338 rrb->request.hdr.len = sizeof(rrb->request);
339 rrb->request.hdr.cmd = CLP_LIST_PCI;
340
341 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
342 rrb->request.resume_token = resume_token;
343
344
345 rc = clp_req(rrb, CLP_LPS_PCI);
346 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
347 zpci_err("List PCI FN:\n");
348 zpci_err_clp(rrb->response.hdr.rsp, rc);
349 rc = -EIO;
350 goto out;
351 }
352
353 update_uid_checking(rrb->response.uid_checking);
354 WARN_ON_ONCE(rrb->response.entry_size !=
355 sizeof(struct clp_fh_list_entry));
356
357 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
358 rrb->response.entry_size;
359
360 resume_token = rrb->response.resume_token;
361 for (i = 0; i < entries; i++)
362 cb(&rrb->response.fh_list[i], data);
363 } while (resume_token);
364out:
365 return rc;
366}
367
368static void __clp_add(struct clp_fh_list_entry *entry, void *data)
369{
370 struct zpci_dev *zdev;
371
372 if (!entry->vendor_id)
373 return;
374
375 zdev = get_zdev_by_fid(entry->fid);
376 if (!zdev)
377 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
378}
379
380static void __clp_update(struct clp_fh_list_entry *entry, void *data)
381{
382 struct zpci_dev *zdev;
383 u32 *fid = data;
384
385 if (!entry->vendor_id)
386 return;
387
388 if (fid && *fid != entry->fid)
389 return;
390
391 zdev = get_zdev_by_fid(entry->fid);
392 if (!zdev)
393 return;
394
395 zdev->fh = entry->fh;
396}
397
398int clp_scan_pci_devices(void)
399{
400 struct clp_req_rsp_list_pci *rrb;
401 int rc;
402
403 rrb = clp_alloc_block(GFP_KERNEL);
404 if (!rrb)
405 return -ENOMEM;
406
407 rc = clp_list_pci(rrb, NULL, __clp_add);
408
409 clp_free_block(rrb);
410 return rc;
411}
412
413int clp_rescan_pci_devices(void)
414{
415 struct clp_req_rsp_list_pci *rrb;
416 int rc;
417
418 zpci_remove_reserved_devices();
419
420 rrb = clp_alloc_block(GFP_KERNEL);
421 if (!rrb)
422 return -ENOMEM;
423
424 rc = clp_list_pci(rrb, NULL, __clp_add);
425
426 clp_free_block(rrb);
427 return rc;
428}
429
430
431
432
433int clp_rescan_pci_devices_simple(u32 *fid)
434{
435 struct clp_req_rsp_list_pci *rrb;
436 int rc;
437
438 rrb = clp_alloc_block(GFP_NOWAIT);
439 if (!rrb)
440 return -ENOMEM;
441
442 rc = clp_list_pci(rrb, fid, __clp_update);
443
444 clp_free_block(rrb);
445 return rc;
446}
447
448struct clp_state_data {
449 u32 fid;
450 enum zpci_state state;
451};
452
453static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
454{
455 struct clp_state_data *sd = data;
456
457 if (entry->fid != sd->fid)
458 return;
459
460 sd->state = entry->config_state;
461}
462
463int clp_get_state(u32 fid, enum zpci_state *state)
464{
465 struct clp_req_rsp_list_pci *rrb;
466 struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
467 int rc;
468
469 rrb = clp_alloc_block(GFP_KERNEL);
470 if (!rrb)
471 return -ENOMEM;
472
473 rc = clp_list_pci(rrb, &sd, __clp_get_state);
474 if (!rc)
475 *state = sd.state;
476
477 clp_free_block(rrb);
478 return rc;
479}
480
481static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
482{
483 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
484
485 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
486 lpcb->response.hdr.len > limit)
487 return -EINVAL;
488 return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
489}
490
491static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
492{
493 switch (lpcb->cmd) {
494 case 0x0001:
495 return clp_base_slpc(req, (void *) lpcb);
496 default:
497 return -EINVAL;
498 }
499}
500
501static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
502{
503 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
504
505 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
506 lpcb->response.hdr.len > limit)
507 return -EINVAL;
508 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
509}
510
511static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
512{
513 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
514
515 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
516 lpcb->response.hdr.len > limit)
517 return -EINVAL;
518 if (lpcb->request.reserved2 != 0)
519 return -EINVAL;
520 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
521}
522
523static int clp_pci_query(struct clp_req *req,
524 struct clp_req_rsp_query_pci *lpcb)
525{
526 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
527
528 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
529 lpcb->response.hdr.len > limit)
530 return -EINVAL;
531 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
532 return -EINVAL;
533 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
534}
535
536static int clp_pci_query_grp(struct clp_req *req,
537 struct clp_req_rsp_query_pci_grp *lpcb)
538{
539 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
540
541 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
542 lpcb->response.hdr.len > limit)
543 return -EINVAL;
544 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
545 lpcb->request.reserved4 != 0)
546 return -EINVAL;
547 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
548}
549
550static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
551{
552 switch (lpcb->cmd) {
553 case 0x0001:
554 return clp_pci_slpc(req, (void *) lpcb);
555 case 0x0002:
556 return clp_pci_list(req, (void *) lpcb);
557 case 0x0003:
558 return clp_pci_query(req, (void *) lpcb);
559 case 0x0004:
560 return clp_pci_query_grp(req, (void *) lpcb);
561 default:
562 return -EINVAL;
563 }
564}
565
566static int clp_normal_command(struct clp_req *req)
567{
568 struct clp_req_hdr *lpcb;
569 void __user *uptr;
570 int rc;
571
572 rc = -EINVAL;
573 if (req->lps != 0 && req->lps != 2)
574 goto out;
575
576 rc = -ENOMEM;
577 lpcb = clp_alloc_block(GFP_KERNEL);
578 if (!lpcb)
579 goto out;
580
581 rc = -EFAULT;
582 uptr = (void __force __user *)(unsigned long) req->data_p;
583 if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
584 goto out_free;
585
586 rc = -EINVAL;
587 if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
588 goto out_free;
589
590 switch (req->lps) {
591 case 0:
592 rc = clp_base_command(req, lpcb);
593 break;
594 case 2:
595 rc = clp_pci_command(req, lpcb);
596 break;
597 }
598 if (rc)
599 goto out_free;
600
601 rc = -EFAULT;
602 if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
603 goto out_free;
604
605 rc = 0;
606
607out_free:
608 clp_free_block(lpcb);
609out:
610 return rc;
611}
612
613static int clp_immediate_command(struct clp_req *req)
614{
615 void __user *uptr;
616 unsigned long ilp;
617 int exists;
618
619 if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
620 return -EINVAL;
621
622 uptr = (void __force __user *)(unsigned long) req->data_p;
623 if (req->cmd == 0) {
624
625 exists = test_bit_inv(req->lps, &ilp);
626 return put_user(exists, (int __user *) uptr);
627 }
628
629 return put_user(ilp, (unsigned long __user *) uptr);
630}
631
632static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
633 unsigned long arg)
634{
635 struct clp_req req;
636 void __user *argp;
637
638 if (cmd != CLP_SYNC)
639 return -EINVAL;
640
641 argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
642 if (copy_from_user(&req, argp, sizeof(req)))
643 return -EFAULT;
644 if (req.r != 0)
645 return -EINVAL;
646 return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
647}
648
649static int clp_misc_release(struct inode *inode, struct file *filp)
650{
651 return 0;
652}
653
654static const struct file_operations clp_misc_fops = {
655 .owner = THIS_MODULE,
656 .open = nonseekable_open,
657 .release = clp_misc_release,
658 .unlocked_ioctl = clp_misc_ioctl,
659 .compat_ioctl = clp_misc_ioctl,
660 .llseek = no_llseek,
661};
662
663static struct miscdevice clp_misc_device = {
664 .minor = MISC_DYNAMIC_MINOR,
665 .name = "clp",
666 .fops = &clp_misc_fops,
667};
668
669static int __init clp_misc_init(void)
670{
671 return misc_register(&clp_misc_device);
672}
673
674device_initcall(clp_misc_init);
675
