Merge tag 'gcc-plugins-v4.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git...
[cascardo/linux.git] / drivers / infiniband / hw / usnic / usnic_vnic.c
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                 usnic_err("Failed to allocate chunk for %s - Out of memory\n",
246                                 usnic_vnic_pci_name(vnic));
247                 return ERR_PTR(-ENOMEM);
248         }
249
250         if (cnt > 0) {
251                 ret->res = kcalloc(cnt, sizeof(*(ret->res)), GFP_ATOMIC);
252                 if (!ret->res) {
253                         usnic_err("Failed to allocate resources for %s. Out of memory\n",
254                                         usnic_vnic_pci_name(vnic));
255                         kfree(ret);
256                         return ERR_PTR(-ENOMEM);
257                 }
258
259                 spin_lock(&vnic->res_lock);
260                 src = &vnic->chunks[type];
261                 for (i = 0; i < src->cnt && ret->cnt < cnt; i++) {
262                         res = src->res[i];
263                         if (!res->owner) {
264                                 src->free_cnt--;
265                                 res->owner = owner;
266                                 ret->res[ret->cnt++] = res;
267                         }
268                 }
269
270                 spin_unlock(&vnic->res_lock);
271         }
272         ret->type = type;
273         ret->vnic = vnic;
274         WARN_ON(ret->cnt != cnt);
275
276         return ret;
277 }
278
279 void usnic_vnic_put_resources(struct usnic_vnic_res_chunk *chunk)
280 {
281
282         struct usnic_vnic_res *res;
283         int i;
284         struct usnic_vnic *vnic = chunk->vnic;
285
286         if (chunk->cnt > 0) {
287                 spin_lock(&vnic->res_lock);
288                 while ((i = --chunk->cnt) >= 0) {
289                         res = chunk->res[i];
290                         chunk->res[i] = NULL;
291                         res->owner = NULL;
292                         vnic->chunks[res->type].free_cnt++;
293                 }
294                 spin_unlock(&vnic->res_lock);
295         }
296
297         kfree(chunk->res);
298         kfree(chunk);
299 }
300
301 u16 usnic_vnic_get_index(struct usnic_vnic *vnic)
302 {
303         return usnic_vnic_get_pdev(vnic)->devfn - 1;
304 }
305
306 static int usnic_vnic_alloc_res_chunk(struct usnic_vnic *vnic,
307                                         enum usnic_vnic_res_type type,
308                                         struct usnic_vnic_res_chunk *chunk)
309 {
310         int cnt, err, i;
311         struct usnic_vnic_res *res;
312
313         cnt = vnic_dev_get_res_count(vnic->vdev, _to_vnic_res_type(type));
314         if (cnt < 1)
315                 return -EINVAL;
316
317         chunk->cnt = chunk->free_cnt = cnt;
318         chunk->res = kzalloc(sizeof(*(chunk->res))*cnt, GFP_KERNEL);
319         if (!chunk->res)
320                 return -ENOMEM;
321
322         for (i = 0; i < cnt; i++) {
323                 res = kzalloc(sizeof(*res), GFP_KERNEL);
324                 if (!res) {
325                         err = -ENOMEM;
326                         goto fail;
327                 }
328                 res->type = type;
329                 res->vnic_idx = i;
330                 res->vnic = vnic;
331                 res->ctrl = vnic_dev_get_res(vnic->vdev,
332                                                 _to_vnic_res_type(type), i);
333                 chunk->res[i] = res;
334         }
335
336         chunk->vnic = vnic;
337         return 0;
338 fail:
339         for (i--; i >= 0; i--)
340                 kfree(chunk->res[i]);
341         kfree(chunk->res);
342         return err;
343 }
344
345 static void usnic_vnic_free_res_chunk(struct usnic_vnic_res_chunk *chunk)
346 {
347         int i;
348         for (i = 0; i < chunk->cnt; i++)
349                 kfree(chunk->res[i]);
350         kfree(chunk->res);
351 }
352
353 static int usnic_vnic_discover_resources(struct pci_dev *pdev,
354                                                 struct usnic_vnic *vnic)
355 {
356         enum usnic_vnic_res_type res_type;
357         int i;
358         int err = 0;
359
360         for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
361                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
362                         continue;
363                 vnic->bar[i].len = pci_resource_len(pdev, i);
364                 vnic->bar[i].vaddr = pci_iomap(pdev, i, vnic->bar[i].len);
365                 if (!vnic->bar[i].vaddr) {
366                         usnic_err("Cannot memory-map BAR %d, aborting\n",
367                                         i);
368                         err = -ENODEV;
369                         goto out_clean_bar;
370                 }
371                 vnic->bar[i].bus_addr = pci_resource_start(pdev, i);
372         }
373
374         vnic->vdev = vnic_dev_register(NULL, pdev, pdev, vnic->bar,
375                         ARRAY_SIZE(vnic->bar));
376         if (!vnic->vdev) {
377                 usnic_err("Failed to register device %s\n",
378                                 pci_name(pdev));
379                 err = -EINVAL;
380                 goto out_clean_bar;
381         }
382
383         for (res_type = USNIC_VNIC_RES_TYPE_EOL + 1;
384                         res_type < USNIC_VNIC_RES_TYPE_MAX; res_type++) {
385                 err = usnic_vnic_alloc_res_chunk(vnic, res_type,
386                                                 &vnic->chunks[res_type]);
387                 if (err) {
388                         usnic_err("Failed to alloc res %s with err %d\n",
389                                         usnic_vnic_res_type_to_str(res_type),
390                                         err);
391                         goto out_clean_chunks;
392                 }
393         }
394
395         return 0;
396
397 out_clean_chunks:
398         for (res_type--; res_type > USNIC_VNIC_RES_TYPE_EOL; res_type--)
399                 usnic_vnic_free_res_chunk(&vnic->chunks[res_type]);
400         vnic_dev_unregister(vnic->vdev);
401 out_clean_bar:
402         for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
403                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
404                         continue;
405                 if (!vnic->bar[i].vaddr)
406                         break;
407
408                 iounmap(vnic->bar[i].vaddr);
409         }
410
411         return err;
412 }
413
414 struct pci_dev *usnic_vnic_get_pdev(struct usnic_vnic *vnic)
415 {
416         return vnic_dev_get_pdev(vnic->vdev);
417 }
418
419 struct vnic_dev_bar *usnic_vnic_get_bar(struct usnic_vnic *vnic,
420                                 int bar_num)
421 {
422         return (bar_num < ARRAY_SIZE(vnic->bar)) ? &vnic->bar[bar_num] : NULL;
423 }
424
425 static void usnic_vnic_release_resources(struct usnic_vnic *vnic)
426 {
427         int i;
428         struct pci_dev *pdev;
429         enum usnic_vnic_res_type res_type;
430
431         pdev = usnic_vnic_get_pdev(vnic);
432
433         for (res_type = USNIC_VNIC_RES_TYPE_EOL + 1;
434                         res_type < USNIC_VNIC_RES_TYPE_MAX; res_type++)
435                 usnic_vnic_free_res_chunk(&vnic->chunks[res_type]);
436
437         vnic_dev_unregister(vnic->vdev);
438
439         for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
440                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
441                         continue;
442                 iounmap(vnic->bar[i].vaddr);
443         }
444 }
445
446 struct usnic_vnic *usnic_vnic_alloc(struct pci_dev *pdev)
447 {
448         struct usnic_vnic *vnic;
449         int err = 0;
450
451         if (!pci_is_enabled(pdev)) {
452                 usnic_err("PCI dev %s is disabled\n", pci_name(pdev));
453                 return ERR_PTR(-EINVAL);
454         }
455
456         vnic = kzalloc(sizeof(*vnic), GFP_KERNEL);
457         if (!vnic) {
458                 usnic_err("Failed to alloc vnic for %s - out of memory\n",
459                                 pci_name(pdev));
460                 return ERR_PTR(-ENOMEM);
461         }
462
463         spin_lock_init(&vnic->res_lock);
464
465         err = usnic_vnic_discover_resources(pdev, vnic);
466         if (err) {
467                 usnic_err("Failed to discover %s resources with err %d\n",
468                                 pci_name(pdev), err);
469                 goto out_free_vnic;
470         }
471
472         usnic_dbg("Allocated vnic for %s\n", usnic_vnic_pci_name(vnic));
473
474         return vnic;
475
476 out_free_vnic:
477         kfree(vnic);
478
479         return ERR_PTR(err);
480 }
481
482 void usnic_vnic_free(struct usnic_vnic *vnic)
483 {
484         usnic_vnic_release_resources(vnic);
485         kfree(vnic);
486 }