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Linux/arch/s390/pci/pci_clp.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright IBM Corp. 2012
  4  *
  5  * Author(s):
  6  *   Jan Glauber <jang@linux.vnet.ibm.com>
  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  * Call Logical Processor with c=1, lps=0 and command 1
 47  * to get the bit mask of installed logical processors
 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  * Call Logical Processor with c=0, the give constant lps and an lpcb request.
 68  */
 69 static 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         /* Query function properties and update zdev */
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  * Enable/Disable a given PCI function defined by its function handle.
244  */
245 static 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 
283 int 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         }
300 out:
301         return rc;
302 }
303 
304 int 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 
320 static 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                 /* store as many entries as possible */
331                 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
332                 rrb->request.resume_token = resume_token;
333 
334                 /* Get PCI function handle list */
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);
354 out:
355         return rc;
356 }
357 
358 static 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 
370 static 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 
384 int 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 
399 int 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 
416 int 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 
431 struct clp_state_data {
432         u32 fid;
433         enum zpci_state state;
434 };
435 
436 static 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 
446 int 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 
464 static 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 
474 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
475 {
476         switch (lpcb->cmd) {
477         case 0x0001: /* store logical-processor characteristics */
478                 return clp_base_slpc(req, (void *) lpcb);
479         default:
480                 return -EINVAL;
481         }
482 }
483 
484 static 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 
494 static 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 
506 static 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 
519 static 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 
533 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
534 {
535         switch (lpcb->cmd) {
536         case 0x0001: /* store logical-processor characteristics */
537                 return clp_pci_slpc(req, (void *) lpcb);
538         case 0x0002: /* list PCI functions */
539                 return clp_pci_list(req, (void *) lpcb);
540         case 0x0003: /* query PCI function */
541                 return clp_pci_query(req, (void *) lpcb);
542         case 0x0004: /* query PCI function group */
543                 return clp_pci_query_grp(req, (void *) lpcb);
544         default:
545                 return -EINVAL;
546         }
547 }
548 
549 static 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 
590 out_free:
591         clp_free_block(lpcb);
592 out:
593         return rc;
594 }
595 
596 static 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                 /* Command code 0: test for a specific processor */
608                 exists = test_bit_inv(req->lps, &ilp);
609                 return put_user(exists, (int __user *) uptr);
610         }
611         /* Command code 1: return bit mask of installed processors */
612         return put_user(ilp, (unsigned long __user *) uptr);
613 }
614 
615 static 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 
632 static int clp_misc_release(struct inode *inode, struct file *filp)
633 {
634         return 0;
635 }
636 
637 static 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 
646 static struct miscdevice clp_misc_device = {
647         .minor = MISC_DYNAMIC_MINOR,
648         .name = "clp",
649         .fops = &clp_misc_fops,
650 };
651 
652 static int __init clp_misc_init(void)
653 {
654         return misc_register(&clp_misc_device);
655 }
656 
657 device_initcall(clp_misc_init);
658 

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