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