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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
27static 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
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
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
116static 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
143static 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
177static 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 }
203out:
204 clp_free_block(rrb);
205 return rc;
206}
207
208int 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
236error:
237 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
238 kfree(zdev);
239 return rc;
240}
241
242
243
244
245static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
246{
247 struct clp_req_rsp_set_pci *rrb;
248 int rc, retries = 100;
249
250 rrb = clp_alloc_block(GFP_KERNEL);
251 if (!rrb)
252 return -ENOMEM;
253
254 do {
255 memset(rrb, 0, sizeof(*rrb));
256 rrb->request.hdr.len = sizeof(rrb->request);
257 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
258 rrb->response.hdr.len = sizeof(rrb->response);
259 rrb->request.fh = *fh;
260 rrb->request.oc = command;
261 rrb->request.ndas = nr_dma_as;
262
263 rc = clp_req(rrb, CLP_LPS_PCI);
264 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
265 retries--;
266 if (retries < 0)
267 break;
268 msleep(20);
269 }
270 } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
271
272 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
273 *fh = rrb->response.fh;
274 else {
275 zpci_err("Set PCI FN:\n");
276 zpci_err_clp(rrb->response.hdr.rsp, rc);
277 rc = -EIO;
278 }
279 clp_free_block(rrb);
280 return rc;
281}
282
283int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
284{
285 u32 fh = zdev->fh;
286 int rc;
287
288 rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
289 zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
290 if (rc)
291 goto out;
292
293 zdev->fh = fh;
294 if (zpci_use_mio(zdev)) {
295 rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_MIO);
296 zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
297 if (rc)
298 clp_disable_fh(zdev);
299 }
300out:
301 return rc;
302}
303
304int clp_disable_fh(struct zpci_dev *zdev)
305{
306 u32 fh = zdev->fh;
307 int rc;
308
309 if (!zdev_enabled(zdev))
310 return 0;
311
312 rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
313 zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
314 if (!rc)
315 zdev->fh = fh;
316
317 return rc;
318}
319
320static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
321 void (*cb)(struct clp_fh_list_entry *, void *))
322{
323 u64 resume_token = 0;
324 int entries, i, rc;
325
326 do {
327 memset(rrb, 0, sizeof(*rrb));
328 rrb->request.hdr.len = sizeof(rrb->request);
329 rrb->request.hdr.cmd = CLP_LIST_PCI;
330
331 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
332 rrb->request.resume_token = resume_token;
333
334
335 rc = clp_req(rrb, CLP_LPS_PCI);
336 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
337 zpci_err("List PCI FN:\n");
338 zpci_err_clp(rrb->response.hdr.rsp, rc);
339 rc = -EIO;
340 goto out;
341 }
342
343 update_uid_checking(rrb->response.uid_checking);
344 WARN_ON_ONCE(rrb->response.entry_size !=
345 sizeof(struct clp_fh_list_entry));
346
347 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
348 rrb->response.entry_size;
349
350 resume_token = rrb->response.resume_token;
351 for (i = 0; i < entries; i++)
352 cb(&rrb->response.fh_list[i], data);
353 } while (resume_token);
354out:
355 return rc;
356}
357
358static void __clp_add(struct clp_fh_list_entry *entry, void *data)
359{
360 struct zpci_dev *zdev;
361
362 if (!entry->vendor_id)
363 return;
364
365 zdev = get_zdev_by_fid(entry->fid);
366 if (!zdev)
367 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
368}
369
370static void __clp_update(struct clp_fh_list_entry *entry, void *data)
371{
372 struct zpci_dev *zdev;
373
374 if (!entry->vendor_id)
375 return;
376
377 zdev = get_zdev_by_fid(entry->fid);
378 if (!zdev)
379 return;
380
381 zdev->fh = entry->fh;
382}
383
384int clp_scan_pci_devices(void)
385{
386 struct clp_req_rsp_list_pci *rrb;
387 int rc;
388
389 rrb = clp_alloc_block(GFP_KERNEL);
390 if (!rrb)
391 return -ENOMEM;
392
393 rc = clp_list_pci(rrb, NULL, __clp_add);
394
395 clp_free_block(rrb);
396 return rc;
397}
398
399int clp_rescan_pci_devices(void)
400{
401 struct clp_req_rsp_list_pci *rrb;
402 int rc;
403
404 zpci_remove_reserved_devices();
405
406 rrb = clp_alloc_block(GFP_KERNEL);
407 if (!rrb)
408 return -ENOMEM;
409
410 rc = clp_list_pci(rrb, NULL, __clp_add);
411
412 clp_free_block(rrb);
413 return rc;
414}
415
416int clp_rescan_pci_devices_simple(void)
417{
418 struct clp_req_rsp_list_pci *rrb;
419 int rc;
420
421 rrb = clp_alloc_block(GFP_NOWAIT);
422 if (!rrb)
423 return -ENOMEM;
424
425 rc = clp_list_pci(rrb, NULL, __clp_update);
426
427 clp_free_block(rrb);
428 return rc;
429}
430
431struct clp_state_data {
432 u32 fid;
433 enum zpci_state state;
434};
435
436static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
437{
438 struct clp_state_data *sd = data;
439
440 if (entry->fid != sd->fid)
441 return;
442
443 sd->state = entry->config_state;
444}
445
446int clp_get_state(u32 fid, enum zpci_state *state)
447{
448 struct clp_req_rsp_list_pci *rrb;
449 struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
450 int rc;
451
452 rrb = clp_alloc_block(GFP_ATOMIC);
453 if (!rrb)
454 return -ENOMEM;
455
456 rc = clp_list_pci(rrb, &sd, __clp_get_state);
457 if (!rc)
458 *state = sd.state;
459
460 clp_free_block(rrb);
461 return rc;
462}
463
464static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
465{
466 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
467
468 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
469 lpcb->response.hdr.len > limit)
470 return -EINVAL;
471 return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
472}
473
474static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
475{
476 switch (lpcb->cmd) {
477 case 0x0001:
478 return clp_base_slpc(req, (void *) lpcb);
479 default:
480 return -EINVAL;
481 }
482}
483
484static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
485{
486 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
487
488 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
489 lpcb->response.hdr.len > limit)
490 return -EINVAL;
491 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
492}
493
494static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
495{
496 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
497
498 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
499 lpcb->response.hdr.len > limit)
500 return -EINVAL;
501 if (lpcb->request.reserved2 != 0)
502 return -EINVAL;
503 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
504}
505
506static int clp_pci_query(struct clp_req *req,
507 struct clp_req_rsp_query_pci *lpcb)
508{
509 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
510
511 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
512 lpcb->response.hdr.len > limit)
513 return -EINVAL;
514 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
515 return -EINVAL;
516 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
517}
518
519static int clp_pci_query_grp(struct clp_req *req,
520 struct clp_req_rsp_query_pci_grp *lpcb)
521{
522 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
523
524 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
525 lpcb->response.hdr.len > limit)
526 return -EINVAL;
527 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
528 lpcb->request.reserved4 != 0)
529 return -EINVAL;
530 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
531}
532
533static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
534{
535 switch (lpcb->cmd) {
536 case 0x0001:
537 return clp_pci_slpc(req, (void *) lpcb);
538 case 0x0002:
539 return clp_pci_list(req, (void *) lpcb);
540 case 0x0003:
541 return clp_pci_query(req, (void *) lpcb);
542 case 0x0004:
543 return clp_pci_query_grp(req, (void *) lpcb);
544 default:
545 return -EINVAL;
546 }
547}
548
549static int clp_normal_command(struct clp_req *req)
550{
551 struct clp_req_hdr *lpcb;
552 void __user *uptr;
553 int rc;
554
555 rc = -EINVAL;
556 if (req->lps != 0 && req->lps != 2)
557 goto out;
558
559 rc = -ENOMEM;
560 lpcb = clp_alloc_block(GFP_KERNEL);
561 if (!lpcb)
562 goto out;
563
564 rc = -EFAULT;
565 uptr = (void __force __user *)(unsigned long) req->data_p;
566 if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
567 goto out_free;
568
569 rc = -EINVAL;
570 if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
571 goto out_free;
572
573 switch (req->lps) {
574 case 0:
575 rc = clp_base_command(req, lpcb);
576 break;
577 case 2:
578 rc = clp_pci_command(req, lpcb);
579 break;
580 }
581 if (rc)
582 goto out_free;
583
584 rc = -EFAULT;
585 if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
586 goto out_free;
587
588 rc = 0;
589
590out_free:
591 clp_free_block(lpcb);
592out:
593 return rc;
594}
595
596static int clp_immediate_command(struct clp_req *req)
597{
598 void __user *uptr;
599 unsigned long ilp;
600 int exists;
601
602 if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
603 return -EINVAL;
604
605 uptr = (void __force __user *)(unsigned long) req->data_p;
606 if (req->cmd == 0) {
607
608 exists = test_bit_inv(req->lps, &ilp);
609 return put_user(exists, (int __user *) uptr);
610 }
611
612 return put_user(ilp, (unsigned long __user *) uptr);
613}
614
615static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
616 unsigned long arg)
617{
618 struct clp_req req;
619 void __user *argp;
620
621 if (cmd != CLP_SYNC)
622 return -EINVAL;
623
624 argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
625 if (copy_from_user(&req, argp, sizeof(req)))
626 return -EFAULT;
627 if (req.r != 0)
628 return -EINVAL;
629 return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
630}
631
632static int clp_misc_release(struct inode *inode, struct file *filp)
633{
634 return 0;
635}
636
637static const struct file_operations clp_misc_fops = {
638 .owner = THIS_MODULE,
639 .open = nonseekable_open,
640 .release = clp_misc_release,
641 .unlocked_ioctl = clp_misc_ioctl,
642 .compat_ioctl = clp_misc_ioctl,
643 .llseek = no_llseek,
644};
645
646static struct miscdevice clp_misc_device = {
647 .minor = MISC_DYNAMIC_MINOR,
648 .name = "clp",
649 .fops = &clp_misc_fops,
650};
651
652static int __init clp_misc_init(void)
653{
654 return misc_register(&clp_misc_device);
655}
656
657device_initcall(clp_misc_init);
658
