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