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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / infiniband / hw / usnic / usnic_vnic.c
blobebe08f348453d57046097fe1b28e20370431ce1d
1 /*
2 * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33 #include <linux/errno.h>
34 #include <linux/module.h>
35 #include <linux/pci.h>
36
37 #include "usnic_ib.h"
38 #include "vnic_resource.h"
39 #include "usnic_log.h"
40 #include "usnic_vnic.h"
41
42 struct usnic_vnic {
43 struct vnic_dev *vdev;
44 struct vnic_dev_bar bar[PCI_NUM_RESOURCES];
45 struct usnic_vnic_res_chunk chunks[USNIC_VNIC_RES_TYPE_MAX];
46 spinlock_t res_lock;
47 };
48
49 static enum vnic_res_type _to_vnic_res_type(enum usnic_vnic_res_type res_type)
50 {
51 #define DEFINE_USNIC_VNIC_RES_AT(usnic_vnic_res_t, vnic_res_type, desc, val) \
52 vnic_res_type,
53 #define DEFINE_USNIC_VNIC_RES(usnic_vnic_res_t, vnic_res_type, desc) \
54 vnic_res_type,
55 static enum vnic_res_type usnic_vnic_type_2_vnic_type[] = {
56 USNIC_VNIC_RES_TYPES};
57 #undef DEFINE_USNIC_VNIC_RES
58 #undef DEFINE_USNIC_VNIC_RES_AT
59
60 if (res_type >= USNIC_VNIC_RES_TYPE_MAX)
61 return RES_TYPE_MAX;
62
63 return usnic_vnic_type_2_vnic_type[res_type];
64 }
65
66 const char *usnic_vnic_res_type_to_str(enum usnic_vnic_res_type res_type)
67 {
68 #define DEFINE_USNIC_VNIC_RES_AT(usnic_vnic_res_t, vnic_res_type, desc, val) \
69 desc,
70 #define DEFINE_USNIC_VNIC_RES(usnic_vnic_res_t, vnic_res_type, desc) \
71 desc,
72 static const char * const usnic_vnic_res_type_desc[] = {
73 USNIC_VNIC_RES_TYPES};
74 #undef DEFINE_USNIC_VNIC_RES
75 #undef DEFINE_USNIC_VNIC_RES_AT
76
77 if (res_type >= USNIC_VNIC_RES_TYPE_MAX)
78 return "unknown";
79
80 return usnic_vnic_res_type_desc[res_type];
81
82 }
83
84 const char *usnic_vnic_pci_name(struct usnic_vnic *vnic)
85 {
86 return pci_name(usnic_vnic_get_pdev(vnic));
87 }
88
89 int usnic_vnic_dump(struct usnic_vnic *vnic, char *buf,
90 int buf_sz,
91 void *hdr_obj,
92 int (*printtitle)(void *, char*, int),
93 int (*printcols)(char *, int),
94 int (*printrow)(void *, char *, int))
95 {
96 struct usnic_vnic_res_chunk *chunk;
97 struct usnic_vnic_res *res;
98 struct vnic_dev_bar *bar0;
99 int i, j, offset;
100
101 offset = 0;
102 bar0 = usnic_vnic_get_bar(vnic, 0);
103 offset += scnprintf(buf + offset, buf_sz - offset,
104 "VF:%hu BAR0 bus_addr=%pa vaddr=0x%p size=%ld ",
105 usnic_vnic_get_index(vnic),
106 &bar0->bus_addr,
107 bar0->vaddr, bar0->len);
108 if (printtitle)
109 offset += printtitle(hdr_obj, buf + offset, buf_sz - offset);
110 offset += scnprintf(buf + offset, buf_sz - offset, "\n");
111 offset += scnprintf(buf + offset, buf_sz - offset,
112 "|RES\t|CTRL_PIN\t\t|IN_USE\t");
113 if (printcols)
114 offset += printcols(buf + offset, buf_sz - offset);
115 offset += scnprintf(buf + offset, buf_sz - offset, "\n");
116
117 spin_lock(&vnic->res_lock);
118 for (i = 0; i < ARRAY_SIZE(vnic->chunks); i++) {
119 chunk = &vnic->chunks[i];
120 for (j = 0; j < chunk->cnt; j++) {
121 res = chunk->res[j];
122 offset += scnprintf(buf + offset, buf_sz - offset,
123 "|%s[%u]\t|0x%p\t|%u\t",
124 usnic_vnic_res_type_to_str(res->type),
125 res->vnic_idx, res->ctrl, !!res->owner);
126 if (printrow) {
127 offset += printrow(res->owner, buf + offset,
128 buf_sz - offset);
129 }
130 offset += scnprintf(buf + offset, buf_sz - offset,
131 "\n");
132 }
133 }
134 spin_unlock(&vnic->res_lock);
135 return offset;
136 }
137
138 void usnic_vnic_res_spec_update(struct usnic_vnic_res_spec *spec,
139 enum usnic_vnic_res_type trgt_type,
140 u16 cnt)
141 {
142 int i;
143
144 for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
145 if (spec->resources[i].type == trgt_type) {
146 spec->resources[i].cnt = cnt;
147 return;
148 }
149 }
150
151 WARN_ON(1);
152 }
153
154 int usnic_vnic_res_spec_satisfied(const struct usnic_vnic_res_spec *min_spec,
155 struct usnic_vnic_res_spec *res_spec)
156 {
157 int found, i, j;
158
159 for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
160 found = 0;
161
162 for (j = 0; j < USNIC_VNIC_RES_TYPE_MAX; j++) {
163 if (res_spec->resources[i].type !=
164 min_spec->resources[i].type)
165 continue;
166 found = 1;
167 if (min_spec->resources[i].cnt >
168 res_spec->resources[i].cnt)
169 return -EINVAL;
170 break;
171 }
172
173 if (!found)
174 return -EINVAL;
175 }
176 return 0;
177 }
178
179 int usnic_vnic_spec_dump(char *buf, int buf_sz,
180 struct usnic_vnic_res_spec *res_spec)
181 {
182 enum usnic_vnic_res_type res_type;
183 int res_cnt;
184 int i;
185 int offset = 0;
186
187 for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
188 res_type = res_spec->resources[i].type;
189 res_cnt = res_spec->resources[i].cnt;
190 offset += scnprintf(buf + offset, buf_sz - offset,
191 "Res: %s Cnt: %d ",
192 usnic_vnic_res_type_to_str(res_type),
193 res_cnt);
194 }
195
196 return offset;
197 }
198
199 int usnic_vnic_check_room(struct usnic_vnic *vnic,
200 struct usnic_vnic_res_spec *res_spec)
201 {
202 int i;
203 enum usnic_vnic_res_type res_type;
204 int res_cnt;
205
206 for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
207 res_type = res_spec->resources[i].type;
208 res_cnt = res_spec->resources[i].cnt;
209
210 if (res_type == USNIC_VNIC_RES_TYPE_EOL)
211 break;
212
213 if (res_cnt > usnic_vnic_res_free_cnt(vnic, res_type))
214 return -EBUSY;
215 }
216
217 return 0;
218 }
219
220 int usnic_vnic_res_cnt(struct usnic_vnic *vnic,
221 enum usnic_vnic_res_type type)
222 {
223 return vnic->chunks[type].cnt;
224 }
225
226 int usnic_vnic_res_free_cnt(struct usnic_vnic *vnic,
227 enum usnic_vnic_res_type type)
228 {
229 return vnic->chunks[type].free_cnt;
230 }
231
232 struct usnic_vnic_res_chunk *
233 usnic_vnic_get_resources(struct usnic_vnic *vnic, enum usnic_vnic_res_type type,
234 int cnt, void *owner)
235 {
236 struct usnic_vnic_res_chunk *src, *ret;
237 struct usnic_vnic_res *res;
238 int i;
239
240 if (usnic_vnic_res_free_cnt(vnic, type) < cnt || cnt < 0 || !owner)
241 return ERR_PTR(-EINVAL);
242
243 ret = kzalloc(sizeof(*ret), GFP_ATOMIC);
244 if (!ret)
245 return ERR_PTR(-ENOMEM);
246
247 if (cnt > 0) {
248 ret->res = kcalloc(cnt, sizeof(*(ret->res)), GFP_ATOMIC);
249 if (!ret->res) {
250 kfree(ret);
251 return ERR_PTR(-ENOMEM);
252 }
253
254 spin_lock(&vnic->res_lock);
255 src = &vnic->chunks[type];
256 for (i = 0; i < src->cnt && ret->cnt < cnt; i++) {
257 res = src->res[i];
258 if (!res->owner) {
259 src->free_cnt--;
260 res->owner = owner;
261 ret->res[ret->cnt++] = res;
262 }
263 }
264
265 spin_unlock(&vnic->res_lock);
266 }
267 ret->type = type;
268 ret->vnic = vnic;
269 WARN_ON(ret->cnt != cnt);
270
271 return ret;
272 }
273
274 void usnic_vnic_put_resources(struct usnic_vnic_res_chunk *chunk)
275 {
276
277 struct usnic_vnic_res *res;
278 int i;
279 struct usnic_vnic *vnic = chunk->vnic;
280
281 if (chunk->cnt > 0) {
282 spin_lock(&vnic->res_lock);
283 while ((i = --chunk->cnt) >= 0) {
284 res = chunk->res[i];
285 chunk->res[i] = NULL;
286 res->owner = NULL;
287 vnic->chunks[res->type].free_cnt++;
288 }
289 spin_unlock(&vnic->res_lock);
290 }
291
292 kfree(chunk->res);
293 kfree(chunk);
294 }
295
296 u16 usnic_vnic_get_index(struct usnic_vnic *vnic)
297 {
298 return usnic_vnic_get_pdev(vnic)->devfn - 1;
299 }
300
301 static int usnic_vnic_alloc_res_chunk(struct usnic_vnic *vnic,
302 enum usnic_vnic_res_type type,
303 struct usnic_vnic_res_chunk *chunk)
304 {
305 int cnt, err, i;
306 struct usnic_vnic_res *res;
307
308 cnt = vnic_dev_get_res_count(vnic->vdev, _to_vnic_res_type(type));
309 if (cnt < 1) {
310 usnic_err("Wrong res count with cnt %d\n", cnt);
311 return -EINVAL;
312 }
313
314 chunk->cnt = chunk->free_cnt = cnt;
315 chunk->res = kcalloc(cnt, sizeof(*(chunk->res)), GFP_KERNEL);
316 if (!chunk->res)
317 return -ENOMEM;
318
319 for (i = 0; i < cnt; i++) {
320 res = kzalloc(sizeof(*res), GFP_KERNEL);
321 if (!res) {
322 err = -ENOMEM;
323 goto fail;
324 }
325 res->type = type;
326 res->vnic_idx = i;
327 res->vnic = vnic;
328 res->ctrl = vnic_dev_get_res(vnic->vdev,
329 _to_vnic_res_type(type), i);
330 chunk->res[i] = res;
331 }
332
333 chunk->vnic = vnic;
334 return 0;
335 fail:
336 for (i--; i >= 0; i--)
337 kfree(chunk->res[i]);
338 kfree(chunk->res);
339 return err;
340 }
341
342 static void usnic_vnic_free_res_chunk(struct usnic_vnic_res_chunk *chunk)
343 {
344 int i;
345 for (i = 0; i < chunk->cnt; i++)
346 kfree(chunk->res[i]);
347 kfree(chunk->res);
348 }
349
350 static int usnic_vnic_discover_resources(struct pci_dev *pdev,
351 struct usnic_vnic *vnic)
352 {
353 enum usnic_vnic_res_type res_type;
354 int i;
355 int err = 0;
356
357 for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
358 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
359 continue;
360 vnic->bar[i].len = pci_resource_len(pdev, i);
361 vnic->bar[i].vaddr = pci_iomap(pdev, i, vnic->bar[i].len);
362 if (!vnic->bar[i].vaddr) {
363 usnic_err("Cannot memory-map BAR %d, aborting\n",
364 i);
365 err = -ENODEV;
366 goto out_clean_bar;
367 }
368 vnic->bar[i].bus_addr = pci_resource_start(pdev, i);
369 }
370
371 vnic->vdev = vnic_dev_register(NULL, pdev, pdev, vnic->bar,
372 ARRAY_SIZE(vnic->bar));
373 if (!vnic->vdev) {
374 usnic_err("Failed to register device %s\n",
375 pci_name(pdev));
376 err = -EINVAL;
377 goto out_clean_bar;
378 }
379
380 for (res_type = USNIC_VNIC_RES_TYPE_EOL + 1;
381 res_type < USNIC_VNIC_RES_TYPE_MAX; res_type++) {
382 err = usnic_vnic_alloc_res_chunk(vnic, res_type,
383 &vnic->chunks[res_type]);
384 if (err)
385 goto out_clean_chunks;
386 }
387
388 return 0;
389
390 out_clean_chunks:
391 for (res_type--; res_type > USNIC_VNIC_RES_TYPE_EOL; res_type--)
392 usnic_vnic_free_res_chunk(&vnic->chunks[res_type]);
393 vnic_dev_unregister(vnic->vdev);
394 out_clean_bar:
395 for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
396 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
397 continue;
398 if (!vnic->bar[i].vaddr)
399 break;
400
401 iounmap(vnic->bar[i].vaddr);
402 }
403
404 return err;
405 }
406
407 struct pci_dev *usnic_vnic_get_pdev(struct usnic_vnic *vnic)
408 {
409 return vnic_dev_get_pdev(vnic->vdev);
410 }
411
412 struct vnic_dev_bar *usnic_vnic_get_bar(struct usnic_vnic *vnic,
413 int bar_num)
414 {
415 return (bar_num < ARRAY_SIZE(vnic->bar)) ? &vnic->bar[bar_num] : NULL;
416 }
417
418 static void usnic_vnic_release_resources(struct usnic_vnic *vnic)
419 {
420 int i;
421 struct pci_dev *pdev;
422 enum usnic_vnic_res_type res_type;
423
424 pdev = usnic_vnic_get_pdev(vnic);
425
426 for (res_type = USNIC_VNIC_RES_TYPE_EOL + 1;
427 res_type < USNIC_VNIC_RES_TYPE_MAX; res_type++)
428 usnic_vnic_free_res_chunk(&vnic->chunks[res_type]);
429
430 vnic_dev_unregister(vnic->vdev);
431
432 for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
433 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
434 continue;
435 iounmap(vnic->bar[i].vaddr);
436 }
437 }
438
439 struct usnic_vnic *usnic_vnic_alloc(struct pci_dev *pdev)
440 {
441 struct usnic_vnic *vnic;
442 int err = 0;
443
444 if (!pci_is_enabled(pdev)) {
445 usnic_err("PCI dev %s is disabled\n", pci_name(pdev));
446 return ERR_PTR(-EINVAL);
447 }
448
449 vnic = kzalloc(sizeof(*vnic), GFP_KERNEL);
450 if (!vnic)
451 return ERR_PTR(-ENOMEM);
452
453 spin_lock_init(&vnic->res_lock);
454
455 err = usnic_vnic_discover_resources(pdev, vnic);
456 if (err) {
457 usnic_err("Failed to discover %s resources with err %d\n",
458 pci_name(pdev), err);
459 goto out_free_vnic;
460 }
461
462 usnic_dbg("Allocated vnic for %s\n", usnic_vnic_pci_name(vnic));
463
464 return vnic;
465
466 out_free_vnic:
467 kfree(vnic);
468
469 return ERR_PTR(err);
470 }
471
472 void usnic_vnic_free(struct usnic_vnic *vnic)
473 {
474 usnic_vnic_release_resources(vnic);
475 kfree(vnic);
476 }
Linux with added FPC-III support