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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/asm-extable.h>
21#include <asm/pci_debug.h>
22#include <asm/pci_clp.h>
23#include <asm/asm.h>
24#include <asm/clp.h>
25#include <uapi/asm/clp.h>
26
27#include "pci_bus.h"
28
29bool zpci_unique_uid;
30
31void update_uid_checking(bool new)
32{
33 if (zpci_unique_uid != new)
34 zpci_dbg(3, "uid checking:%d\n", new);
35
36 zpci_unique_uid = new;
37}
38
39static inline void zpci_err_clp(unsigned int rsp, int rc)
40{
41 struct {
42 unsigned int rsp;
43 int rc;
44 } __packed data = {rsp, rc};
45
46 zpci_err_hex(&data, sizeof(data));
47}
48
49/*
50 * Call Logical Processor with c=1, lps=0 and command 1
51 * to get the bit mask of installed logical processors
52 */
53static inline int clp_get_ilp(unsigned long *ilp)
54{
55 unsigned long mask;
56 int cc, exception;
57
58 exception = 1;
59 asm volatile (
60 " .insn rrf,0xb9a00000,%[mask],%[cmd],8,0\n"
61 "0: lhi %[exc],0\n"
62 "1:\n"
63 CC_IPM(cc)
64 EX_TABLE(0b, 1b)
65 : CC_OUT(cc, cc), [mask] "=d" (mask), [exc] "+d" (exception)
66 : [cmd] "a" (1)
67 : CC_CLOBBER);
68 *ilp = mask;
69 return exception ? 3 : CC_TRANSFORM(cc);
70}
71
72/*
73 * Call Logical Processor with c=0, the give constant lps and an lpcb request.
74 */
75static __always_inline int clp_req(void *data, unsigned int lps)
76{
77 struct { u8 _[CLP_BLK_SIZE]; } *req = data;
78 int cc, exception;
79 u64 ignored;
80
81 exception = 1;
82 asm volatile (
83 " .insn rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n"
84 "0: lhi %[exc],0\n"
85 "1:\n"
86 CC_IPM(cc)
87 EX_TABLE(0b, 1b)
88 : CC_OUT(cc, cc), [ign] "=d" (ignored), "+m" (*req), [exc] "+d" (exception)
89 : [req] "a" (req), [lps] "i" (lps)
90 : CC_CLOBBER);
91 return exception ? 3 : CC_TRANSFORM(cc);
92}
93
94static void *clp_alloc_block(gfp_t gfp_mask)
95{
96 return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
97}
98
99static void clp_free_block(void *ptr)
100{
101 free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
102}
103
104static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
105 struct clp_rsp_query_pci_grp *response)
106{
107 zdev->tlb_refresh = response->refresh;
108 zdev->dma_mask = response->dasm;
109 zdev->msi_addr = response->msia;
110 zdev->max_msi = response->noi;
111 zdev->fmb_update = response->mui;
112 zdev->version = response->version;
113 zdev->maxstbl = response->maxstbl;
114 zdev->dtsm = response->dtsm;
115
116 switch (response->version) {
117 case 1:
118 zdev->max_bus_speed = PCIE_SPEED_5_0GT;
119 break;
120 default:
121 zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
122 break;
123 }
124}
125
126static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
127{
128 struct clp_req_rsp_query_pci_grp *rrb;
129 int rc;
130
131 rrb = clp_alloc_block(GFP_KERNEL);
132 if (!rrb)
133 return -ENOMEM;
134
135 memset(rrb, 0, sizeof(*rrb));
136 rrb->request.hdr.len = sizeof(rrb->request);
137 rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
138 rrb->response.hdr.len = sizeof(rrb->response);
139 rrb->request.pfgid = pfgid;
140
141 rc = clp_req(rrb, CLP_LPS_PCI);
142 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
143 clp_store_query_pci_fngrp(zdev, &rrb->response);
144 else {
145 zpci_err("Q PCI FGRP:\n");
146 zpci_err_clp(rrb->response.hdr.rsp, rc);
147 rc = -EIO;
148 }
149 clp_free_block(rrb);
150 return rc;
151}
152
153static int clp_store_query_pci_fn(struct zpci_dev *zdev,
154 struct clp_rsp_query_pci *response)
155{
156 int i;
157
158 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
159 zdev->bars[i].val = le32_to_cpu(response->bar[i]);
160 zdev->bars[i].size = response->bar_size[i];
161 }
162 zdev->start_dma = response->sdma;
163 zdev->end_dma = response->edma;
164 zdev->pchid = response->pchid;
165 zdev->pfgid = response->pfgid;
166 zdev->pft = response->pft;
167 zdev->vfn = response->vfn;
168 zdev->port = response->port;
169 zdev->fidparm = response->fidparm;
170 zdev->uid = response->uid;
171 zdev->fmb_length = sizeof(u32) * response->fmb_len;
172 zdev->is_physfn = response->is_physfn;
173 zdev->rid_available = response->rid_avail;
174 if (zdev->rid_available)
175 zdev->rid = response->rid;
176 zdev->tid_avail = response->tid_avail;
177 if (zdev->tid_avail)
178 zdev->tid = response->tid;
179
180 memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
181 if (response->util_str_avail) {
182 memcpy(zdev->util_str, response->util_str,
183 sizeof(zdev->util_str));
184 zdev->util_str_avail = 1;
185 }
186 zdev->mio_capable = response->mio_addr_avail;
187 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
188 if (!(response->mio.valid & (1 << (PCI_STD_NUM_BARS - i - 1))))
189 continue;
190
191 zdev->bars[i].mio_wb = (void __iomem *) response->mio.addr[i].wb;
192 zdev->bars[i].mio_wt = (void __iomem *) response->mio.addr[i].wt;
193 }
194 return 0;
195}
196
197int clp_query_pci_fn(struct zpci_dev *zdev)
198{
199 struct clp_req_rsp_query_pci *rrb;
200 int rc;
201
202 rrb = clp_alloc_block(GFP_KERNEL);
203 if (!rrb)
204 return -ENOMEM;
205
206 memset(rrb, 0, sizeof(*rrb));
207 rrb->request.hdr.len = sizeof(rrb->request);
208 rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
209 rrb->response.hdr.len = sizeof(rrb->response);
210 rrb->request.fh = zdev->fh;
211
212 rc = clp_req(rrb, CLP_LPS_PCI);
213 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
214 rc = clp_store_query_pci_fn(zdev, &rrb->response);
215 if (rc)
216 goto out;
217 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
218 } else {
219 zpci_err("Q PCI FN:\n");
220 zpci_err_clp(rrb->response.hdr.rsp, rc);
221 rc = -EIO;
222 }
223out:
224 clp_free_block(rrb);
225 return rc;
226}
227
228/**
229 * clp_set_pci_fn() - Execute a command on a PCI function
230 * @zdev: Function that will be affected
231 * @fh: Out parameter for updated function handle
232 * @nr_dma_as: DMA address space number
233 * @command: The command code to execute
234 *
235 * Returns: 0 on success, < 0 for Linux errors (e.g. -ENOMEM), and
236 * > 0 for non-success platform responses
237 */
238static int clp_set_pci_fn(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as, u8 command)
239{
240 struct clp_req_rsp_set_pci *rrb;
241 int rc, retries = 100;
242 u32 gisa = 0;
243
244 *fh = 0;
245 rrb = clp_alloc_block(GFP_KERNEL);
246 if (!rrb)
247 return -ENOMEM;
248
249 if (command != CLP_SET_DISABLE_PCI_FN)
250 gisa = zdev->gisa;
251
252 do {
253 memset(rrb, 0, sizeof(*rrb));
254 rrb->request.hdr.len = sizeof(rrb->request);
255 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
256 rrb->response.hdr.len = sizeof(rrb->response);
257 rrb->request.fh = zdev->fh;
258 rrb->request.oc = command;
259 rrb->request.ndas = nr_dma_as;
260 rrb->request.gisa = gisa;
261
262 rc = clp_req(rrb, CLP_LPS_PCI);
263 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
264 retries--;
265 if (retries < 0)
266 break;
267 msleep(20);
268 }
269 } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
270
271 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
272 *fh = rrb->response.fh;
273 } else {
274 zpci_err("Set PCI FN:\n");
275 zpci_err_clp(rrb->response.hdr.rsp, rc);
276 if (!rc)
277 rc = rrb->response.hdr.rsp;
278 }
279 clp_free_block(rrb);
280 return rc;
281}
282
283int clp_setup_writeback_mio(void)
284{
285 struct clp_req_rsp_slpc_pci *rrb;
286 u8 wb_bit_pos;
287 int rc;
288
289 rrb = clp_alloc_block(GFP_KERNEL);
290 if (!rrb)
291 return -ENOMEM;
292
293 memset(rrb, 0, sizeof(*rrb));
294 rrb->request.hdr.len = sizeof(rrb->request);
295 rrb->request.hdr.cmd = CLP_SLPC;
296 rrb->response.hdr.len = sizeof(rrb->response);
297
298 rc = clp_req(rrb, CLP_LPS_PCI);
299 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
300 if (rrb->response.vwb) {
301 wb_bit_pos = rrb->response.mio_wb;
302 set_bit_inv(wb_bit_pos, &mio_wb_bit_mask);
303 zpci_dbg(3, "wb bit: %d\n", wb_bit_pos);
304 } else {
305 zpci_dbg(3, "wb bit: n.a.\n");
306 }
307
308 } else {
309 zpci_err("SLPC PCI:\n");
310 zpci_err_clp(rrb->response.hdr.rsp, rc);
311 rc = -EIO;
312 }
313 clp_free_block(rrb);
314 return rc;
315}
316
317int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as)
318{
319 int rc;
320
321 rc = clp_set_pci_fn(zdev, fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
322 zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, *fh, rc);
323 if (!rc && zpci_use_mio(zdev)) {
324 rc = clp_set_pci_fn(zdev, fh, nr_dma_as, CLP_SET_ENABLE_MIO);
325 zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n",
326 zdev->fid, *fh, rc);
327 if (rc)
328 clp_disable_fh(zdev, fh);
329 }
330 return rc;
331}
332
333int clp_disable_fh(struct zpci_dev *zdev, u32 *fh)
334{
335 int rc;
336
337 if (!zdev_enabled(zdev))
338 return 0;
339
340 rc = clp_set_pci_fn(zdev, fh, 0, CLP_SET_DISABLE_PCI_FN);
341 zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, *fh, rc);
342 return rc;
343}
344
345static int clp_list_pci_req(struct clp_req_rsp_list_pci *rrb,
346 u64 *resume_token, int *nentries)
347{
348 int rc;
349
350 memset(rrb, 0, sizeof(*rrb));
351 rrb->request.hdr.len = sizeof(rrb->request);
352 rrb->request.hdr.cmd = CLP_LIST_PCI;
353 /* store as many entries as possible */
354 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
355 rrb->request.resume_token = *resume_token;
356
357 /* Get PCI function handle list */
358 rc = clp_req(rrb, CLP_LPS_PCI);
359 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
360 zpci_err("List PCI FN:\n");
361 zpci_err_clp(rrb->response.hdr.rsp, rc);
362 return -EIO;
363 }
364
365 update_uid_checking(rrb->response.uid_checking);
366 WARN_ON_ONCE(rrb->response.entry_size !=
367 sizeof(struct clp_fh_list_entry));
368
369 *nentries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
370 rrb->response.entry_size;
371 *resume_token = rrb->response.resume_token;
372
373 return rc;
374}
375
376static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
377 void (*cb)(struct clp_fh_list_entry *, void *))
378{
379 u64 resume_token = 0;
380 int nentries, i, rc;
381
382 do {
383 rc = clp_list_pci_req(rrb, &resume_token, &nentries);
384 if (rc)
385 return rc;
386 for (i = 0; i < nentries; i++)
387 cb(&rrb->response.fh_list[i], data);
388 } while (resume_token);
389
390 return rc;
391}
392
393static int clp_find_pci(struct clp_req_rsp_list_pci *rrb, u32 fid,
394 struct clp_fh_list_entry *entry)
395{
396 struct clp_fh_list_entry *fh_list;
397 u64 resume_token = 0;
398 int nentries, i, rc;
399
400 do {
401 rc = clp_list_pci_req(rrb, &resume_token, &nentries);
402 if (rc)
403 return rc;
404 fh_list = rrb->response.fh_list;
405 for (i = 0; i < nentries; i++) {
406 if (fh_list[i].fid == fid) {
407 *entry = fh_list[i];
408 return 0;
409 }
410 }
411 } while (resume_token);
412
413 return -ENODEV;
414}
415
416static void __clp_add(struct clp_fh_list_entry *entry, void *data)
417{
418 struct list_head *scan_list = data;
419 struct zpci_dev *zdev;
420
421 if (!entry->vendor_id)
422 return;
423
424 zdev = get_zdev_by_fid(entry->fid);
425 if (zdev) {
426 zpci_zdev_put(zdev);
427 return;
428 }
429 zdev = zpci_create_device(entry->fid, entry->fh, entry->config_state);
430 list_add_tail(&zdev->entry, scan_list);
431}
432
433int clp_scan_pci_devices(struct list_head *scan_list)
434{
435 struct clp_req_rsp_list_pci *rrb;
436 int rc;
437
438 rrb = clp_alloc_block(GFP_KERNEL);
439 if (!rrb)
440 return -ENOMEM;
441
442 rc = clp_list_pci(rrb, scan_list, __clp_add);
443
444 clp_free_block(rrb);
445 return rc;
446}
447
448/*
449 * Get the current function handle of the function matching @fid
450 */
451int clp_refresh_fh(u32 fid, u32 *fh)
452{
453 struct clp_req_rsp_list_pci *rrb;
454 struct clp_fh_list_entry entry;
455 int rc;
456
457 rrb = clp_alloc_block(GFP_NOWAIT);
458 if (!rrb)
459 return -ENOMEM;
460
461 rc = clp_find_pci(rrb, fid, &entry);
462 if (!rc)
463 *fh = entry.fh;
464
465 clp_free_block(rrb);
466 return rc;
467}
468
469int clp_get_state(u32 fid, enum zpci_state *state)
470{
471 struct clp_req_rsp_list_pci *rrb;
472 struct clp_fh_list_entry entry;
473 int rc;
474
475 rrb = clp_alloc_block(GFP_ATOMIC);
476 if (!rrb)
477 return -ENOMEM;
478
479 rc = clp_find_pci(rrb, fid, &entry);
480 if (!rc) {
481 *state = entry.config_state;
482 } else if (rc == -ENODEV) {
483 *state = ZPCI_FN_STATE_RESERVED;
484 rc = 0;
485 }
486
487 clp_free_block(rrb);
488 return rc;
489}
490
491static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
492{
493 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
494
495 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
496 lpcb->response.hdr.len > limit)
497 return -EINVAL;
498 return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
499}
500
501static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
502{
503 switch (lpcb->cmd) {
504 case 0x0001: /* store logical-processor characteristics */
505 return clp_base_slpc(req, (void *) lpcb);
506 default:
507 return -EINVAL;
508 }
509}
510
511static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc_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 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
519}
520
521static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
522{
523 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
524
525 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
526 lpcb->response.hdr.len > limit)
527 return -EINVAL;
528 if (lpcb->request.reserved2 != 0)
529 return -EINVAL;
530 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
531}
532
533static int clp_pci_query(struct clp_req *req,
534 struct clp_req_rsp_query_pci *lpcb)
535{
536 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
537
538 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
539 lpcb->response.hdr.len > limit)
540 return -EINVAL;
541 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
542 return -EINVAL;
543 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
544}
545
546static int clp_pci_query_grp(struct clp_req *req,
547 struct clp_req_rsp_query_pci_grp *lpcb)
548{
549 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
550
551 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
552 lpcb->response.hdr.len > limit)
553 return -EINVAL;
554 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
555 lpcb->request.reserved4 != 0)
556 return -EINVAL;
557 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
558}
559
560static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
561{
562 switch (lpcb->cmd) {
563 case 0x0001: /* store logical-processor characteristics */
564 return clp_pci_slpc(req, (void *) lpcb);
565 case 0x0002: /* list PCI functions */
566 return clp_pci_list(req, (void *) lpcb);
567 case 0x0003: /* query PCI function */
568 return clp_pci_query(req, (void *) lpcb);
569 case 0x0004: /* query PCI function group */
570 return clp_pci_query_grp(req, (void *) lpcb);
571 default:
572 return -EINVAL;
573 }
574}
575
576static int clp_normal_command(struct clp_req *req)
577{
578 struct clp_req_hdr *lpcb;
579 void __user *uptr;
580 int rc;
581
582 rc = -EINVAL;
583 if (req->lps != 0 && req->lps != 2)
584 goto out;
585
586 rc = -ENOMEM;
587 lpcb = clp_alloc_block(GFP_KERNEL);
588 if (!lpcb)
589 goto out;
590
591 rc = -EFAULT;
592 uptr = (void __force __user *)(unsigned long) req->data_p;
593 if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
594 goto out_free;
595
596 rc = -EINVAL;
597 if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
598 goto out_free;
599
600 switch (req->lps) {
601 case 0:
602 rc = clp_base_command(req, lpcb);
603 break;
604 case 2:
605 rc = clp_pci_command(req, lpcb);
606 break;
607 }
608 if (rc)
609 goto out_free;
610
611 rc = -EFAULT;
612 if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
613 goto out_free;
614
615 rc = 0;
616
617out_free:
618 clp_free_block(lpcb);
619out:
620 return rc;
621}
622
623static int clp_immediate_command(struct clp_req *req)
624{
625 void __user *uptr;
626 unsigned long ilp;
627 int exists;
628
629 if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
630 return -EINVAL;
631
632 uptr = (void __force __user *)(unsigned long) req->data_p;
633 if (req->cmd == 0) {
634 /* Command code 0: test for a specific processor */
635 exists = test_bit_inv(req->lps, &ilp);
636 return put_user(exists, (int __user *) uptr);
637 }
638 /* Command code 1: return bit mask of installed processors */
639 return put_user(ilp, (unsigned long __user *) uptr);
640}
641
642static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
643 unsigned long arg)
644{
645 struct clp_req req;
646 void __user *argp;
647
648 if (cmd != CLP_SYNC)
649 return -EINVAL;
650
651 argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
652 if (copy_from_user(&req, argp, sizeof(req)))
653 return -EFAULT;
654 if (req.r != 0)
655 return -EINVAL;
656 return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
657}
658
659static int clp_misc_release(struct inode *inode, struct file *filp)
660{
661 return 0;
662}
663
664static const struct file_operations clp_misc_fops = {
665 .owner = THIS_MODULE,
666 .open = nonseekable_open,
667 .release = clp_misc_release,
668 .unlocked_ioctl = clp_misc_ioctl,
669 .compat_ioctl = clp_misc_ioctl,
670};
671
672static struct miscdevice clp_misc_device = {
673 .minor = MISC_DYNAMIC_MINOR,
674 .name = "clp",
675 .fops = &clp_misc_fops,
676};
677
678builtin_misc_device(clp_misc_device);
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/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 * Call Logical Processor with c=1, lps=0 and command 1
48 * to get the bit mask of installed logical processors
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 * Call Logical Processor with c=0, the give constant lps and an lpcb request.
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 /* Query function properties and update zdev */
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 * Enable/Disable a given PCI function defined by its function handle.
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 /* Success -> store enabled handle in zdev */
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 /* Success -> store disabled handle in zdev */
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 /* store as many entries as possible */
319 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
320 rrb->request.resume_token = resume_token;
321
322 /* Get PCI function handle list */
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: /* store logical-processor characteristics */
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: /* store logical-processor characteristics */
525 return clp_pci_slpc(req, (void *) lpcb);
526 case 0x0002: /* list PCI functions */
527 return clp_pci_list(req, (void *) lpcb);
528 case 0x0003: /* query PCI function */
529 return clp_pci_query(req, (void *) lpcb);
530 case 0x0004: /* query PCI function group */
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 /* Command code 0: test for a specific processor */
596 exists = test_bit_inv(req->lps, &ilp);
597 return put_user(exists, (int __user *) uptr);
598 }
599 /* Command code 1: return bit mask of installed processors */
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);