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authorKishon Vijay Abraham I <kishon@ti.com>2017-03-27 05:44:59 -0400
committerBjorn Helgaas <bhelgaas@google.com>2017-04-11 15:18:36 -0400
commitd746799116103d857be203382b09035bbe225d03 (patch)
tree425b32254a747375dcb1716e75790882bb0020bc
parenta8a5be098885e8394497a6b64fb3f96dd217846b (diff)
PCI: endpoint: Introduce configfs entry for configuring EP functions
Introduce a new configfs entry to configure the EP function (like configuring the standard configuration header entries) and to bind the EP function with EP controller. Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat
-rw-r--r--drivers/pci/endpoint/Kconfig9
-rw-r--r--drivers/pci/endpoint/Makefile1
-rw-r--r--drivers/pci/endpoint/pci-ep-cfs.c509
-rw-r--r--include/linux/pci-ep-cfs.h41
4 files changed, 560 insertions, 0 deletions
diff --git a/drivers/pci/endpoint/Kconfig b/drivers/pci/endpoint/Kconfig
index a5442ace7077..c86bca9b7de3 100644
--- a/drivers/pci/endpoint/Kconfig
+++ b/drivers/pci/endpoint/Kconfig
@@ -17,4 +17,13 @@ config PCI_ENDPOINT
17 17
18 If in doubt, say "N" to disable Endpoint support. 18 If in doubt, say "N" to disable Endpoint support.
19 19
20config PCI_ENDPOINT_CONFIGFS
21 bool "PCI Endpoint Configfs Support"
22 depends on PCI_ENDPOINT
23 select CONFIGFS_FS
24 help
25 This will enable the configfs entry that can be used to
26 configure the endpoint function and used to bind the
27 function with a endpoint controller.
28
20endmenu 29endmenu
diff --git a/drivers/pci/endpoint/Makefile b/drivers/pci/endpoint/Makefile
index dc1bc16491e6..7219d51bb401 100644
--- a/drivers/pci/endpoint/Makefile
+++ b/drivers/pci/endpoint/Makefile
@@ -2,5 +2,6 @@
2# Makefile for PCI Endpoint Support 2# Makefile for PCI Endpoint Support
3# 3#
4 4
5obj-$(CONFIG_PCI_ENDPOINT_CONFIGFS) += pci-ep-cfs.o
5obj-$(CONFIG_PCI_ENDPOINT) += pci-epc-core.o pci-epf-core.o\ 6obj-$(CONFIG_PCI_ENDPOINT) += pci-epc-core.o pci-epf-core.o\
6 pci-epc-mem.o 7 pci-epc-mem.o
diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
new file mode 100644
index 000000000000..424fdd6ed1ca
--- /dev/null
+++ b/drivers/pci/endpoint/pci-ep-cfs.c
@@ -0,0 +1,509 @@
1/**
2 * configfs to configure the PCI endpoint
3 *
4 * Copyright (C) 2017 Texas Instruments
5 * Author: Kishon Vijay Abraham I <kishon@ti.com>
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 of
9 * the License as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/module.h>
21#include <linux/slab.h>
22
23#include <linux/pci-epc.h>
24#include <linux/pci-epf.h>
25#include <linux/pci-ep-cfs.h>
26
27static struct config_group *functions_group;
28static struct config_group *controllers_group;
29
30struct pci_epf_group {
31 struct config_group group;
32 struct pci_epf *epf;
33};
34
35struct pci_epc_group {
36 struct config_group group;
37 struct pci_epc *epc;
38 bool start;
39 unsigned long function_num_map;
40};
41
42static inline struct pci_epf_group *to_pci_epf_group(struct config_item *item)
43{
44 return container_of(to_config_group(item), struct pci_epf_group, group);
45}
46
47static inline struct pci_epc_group *to_pci_epc_group(struct config_item *item)
48{
49 return container_of(to_config_group(item), struct pci_epc_group, group);
50}
51
52static ssize_t pci_epc_start_store(struct config_item *item, const char *page,
53 size_t len)
54{
55 int ret;
56 bool start;
57 struct pci_epc *epc;
58 struct pci_epc_group *epc_group = to_pci_epc_group(item);
59
60 epc = epc_group->epc;
61
62 ret = kstrtobool(page, &start);
63 if (ret)
64 return ret;
65
66 if (!start) {
67 pci_epc_stop(epc);
68 return len;
69 }
70
71 ret = pci_epc_start(epc);
72 if (ret) {
73 dev_err(&epc->dev, "failed to start endpoint controller\n");
74 return -EINVAL;
75 }
76
77 epc_group->start = start;
78
79 return len;
80}
81
82static ssize_t pci_epc_start_show(struct config_item *item, char *page)
83{
84 return sprintf(page, "%d\n",
85 to_pci_epc_group(item)->start);
86}
87
88CONFIGFS_ATTR(pci_epc_, start);
89
90static struct configfs_attribute *pci_epc_attrs[] = {
91 &pci_epc_attr_start,
92 NULL,
93};
94
95static int pci_epc_epf_link(struct config_item *epc_item,
96 struct config_item *epf_item)
97{
98 int ret;
99 u32 func_no = 0;
100 struct pci_epc *epc;
101 struct pci_epf *epf;
102 struct pci_epf_group *epf_group = to_pci_epf_group(epf_item);
103 struct pci_epc_group *epc_group = to_pci_epc_group(epc_item);
104
105 epc = epc_group->epc;
106 epf = epf_group->epf;
107 ret = pci_epc_add_epf(epc, epf);
108 if (ret)
109 goto err_add_epf;
110
111 func_no = find_first_zero_bit(&epc_group->function_num_map,
112 sizeof(epc_group->function_num_map));
113 set_bit(func_no, &epc_group->function_num_map);
114 epf->func_no = func_no;
115
116 ret = pci_epf_bind(epf);
117 if (ret)
118 goto err_epf_bind;
119
120 return 0;
121
122err_epf_bind:
123 pci_epc_remove_epf(epc, epf);
124
125err_add_epf:
126 clear_bit(func_no, &epc_group->function_num_map);
127
128 return ret;
129}
130
131static void pci_epc_epf_unlink(struct config_item *epc_item,
132 struct config_item *epf_item)
133{
134 struct pci_epc *epc;
135 struct pci_epf *epf;
136 struct pci_epf_group *epf_group = to_pci_epf_group(epf_item);
137 struct pci_epc_group *epc_group = to_pci_epc_group(epc_item);
138
139 WARN_ON_ONCE(epc_group->start);
140
141 epc = epc_group->epc;
142 epf = epf_group->epf;
143 clear_bit(epf->func_no, &epc_group->function_num_map);
144 pci_epf_unbind(epf);
145 pci_epc_remove_epf(epc, epf);
146}
147
148static struct configfs_item_operations pci_epc_item_ops = {
149 .allow_link = pci_epc_epf_link,
150 .drop_link = pci_epc_epf_unlink,
151};
152
153static struct config_item_type pci_epc_type = {
154 .ct_item_ops = &pci_epc_item_ops,
155 .ct_attrs = pci_epc_attrs,
156 .ct_owner = THIS_MODULE,
157};
158
159struct config_group *pci_ep_cfs_add_epc_group(const char *name)
160{
161 int ret;
162 struct pci_epc *epc;
163 struct config_group *group;
164 struct pci_epc_group *epc_group;
165
166 epc_group = kzalloc(sizeof(*epc_group), GFP_KERNEL);
167 if (!epc_group) {
168 ret = -ENOMEM;
169 goto err;
170 }
171
172 group = &epc_group->group;
173
174 config_group_init_type_name(group, name, &pci_epc_type);
175 ret = configfs_register_group(controllers_group, group);
176 if (ret) {
177 pr_err("failed to register configfs group for %s\n", name);
178 goto err_register_group;
179 }
180
181 epc = pci_epc_get(name);
182 if (IS_ERR(epc)) {
183 ret = PTR_ERR(epc);
184 goto err_epc_get;
185 }
186
187 epc_group->epc = epc;
188
189 return group;
190
191err_epc_get:
192 configfs_unregister_group(group);
193
194err_register_group:
195 kfree(epc_group);
196
197err:
198 return ERR_PTR(ret);
199}
200EXPORT_SYMBOL(pci_ep_cfs_add_epc_group);
201
202void pci_ep_cfs_remove_epc_group(struct config_group *group)
203{
204 struct pci_epc_group *epc_group;
205
206 if (!group)
207 return;
208
209 epc_group = container_of(group, struct pci_epc_group, group);
210 pci_epc_put(epc_group->epc);
211 configfs_unregister_group(&epc_group->group);
212 kfree(epc_group);
213}
214EXPORT_SYMBOL(pci_ep_cfs_remove_epc_group);
215
216#define PCI_EPF_HEADER_R(_name) \
217static ssize_t pci_epf_##_name##_show(struct config_item *item, char *page) \
218{ \
219 struct pci_epf *epf = to_pci_epf_group(item)->epf; \
220 if (WARN_ON_ONCE(!epf->header)) \
221 return -EINVAL; \
222 return sprintf(page, "0x%04x\n", epf->header->_name); \
223}
224
225#define PCI_EPF_HEADER_W_u32(_name) \
226static ssize_t pci_epf_##_name##_store(struct config_item *item, \
227 const char *page, size_t len) \
228{ \
229 u32 val; \
230 int ret; \
231 struct pci_epf *epf = to_pci_epf_group(item)->epf; \
232 if (WARN_ON_ONCE(!epf->header)) \
233 return -EINVAL; \
234 ret = kstrtou32(page, 0, &val); \
235 if (ret) \
236 return ret; \
237 epf->header->_name = val; \
238 return len; \
239}
240
241#define PCI_EPF_HEADER_W_u16(_name) \
242static ssize_t pci_epf_##_name##_store(struct config_item *item, \
243 const char *page, size_t len) \
244{ \
245 u16 val; \
246 int ret; \
247 struct pci_epf *epf = to_pci_epf_group(item)->epf; \
248 if (WARN_ON_ONCE(!epf->header)) \
249 return -EINVAL; \
250 ret = kstrtou16(page, 0, &val); \
251 if (ret) \
252 return ret; \
253 epf->header->_name = val; \
254 return len; \
255}
256
257#define PCI_EPF_HEADER_W_u8(_name) \
258static ssize_t pci_epf_##_name##_store(struct config_item *item, \
259 const char *page, size_t len) \
260{ \
261 u8 val; \
262 int ret; \
263 struct pci_epf *epf = to_pci_epf_group(item)->epf; \
264 if (WARN_ON_ONCE(!epf->header)) \
265 return -EINVAL; \
266 ret = kstrtou8(page, 0, &val); \
267 if (ret) \
268 return ret; \
269 epf->header->_name = val; \
270 return len; \
271}
272
273static ssize_t pci_epf_msi_interrupts_store(struct config_item *item,
274 const char *page, size_t len)
275{
276 u8 val;
277 int ret;
278
279 ret = kstrtou8(page, 0, &val);
280 if (ret)
281 return ret;
282
283 to_pci_epf_group(item)->epf->msi_interrupts = val;
284
285 return len;
286}
287
288static ssize_t pci_epf_msi_interrupts_show(struct config_item *item,
289 char *page)
290{
291 return sprintf(page, "%d\n",
292 to_pci_epf_group(item)->epf->msi_interrupts);
293}
294
295PCI_EPF_HEADER_R(vendorid)
296PCI_EPF_HEADER_W_u16(vendorid)
297
298PCI_EPF_HEADER_R(deviceid)
299PCI_EPF_HEADER_W_u16(deviceid)
300
301PCI_EPF_HEADER_R(revid)
302PCI_EPF_HEADER_W_u8(revid)
303
304PCI_EPF_HEADER_R(progif_code)
305PCI_EPF_HEADER_W_u8(progif_code)
306
307PCI_EPF_HEADER_R(subclass_code)
308PCI_EPF_HEADER_W_u8(subclass_code)
309
310PCI_EPF_HEADER_R(baseclass_code)
311PCI_EPF_HEADER_W_u8(baseclass_code)
312
313PCI_EPF_HEADER_R(cache_line_size)
314PCI_EPF_HEADER_W_u8(cache_line_size)
315
316PCI_EPF_HEADER_R(subsys_vendor_id)
317PCI_EPF_HEADER_W_u16(subsys_vendor_id)
318
319PCI_EPF_HEADER_R(subsys_id)
320PCI_EPF_HEADER_W_u16(subsys_id)
321
322PCI_EPF_HEADER_R(interrupt_pin)
323PCI_EPF_HEADER_W_u8(interrupt_pin)
324
325CONFIGFS_ATTR(pci_epf_, vendorid);
326CONFIGFS_ATTR(pci_epf_, deviceid);
327CONFIGFS_ATTR(pci_epf_, revid);
328CONFIGFS_ATTR(pci_epf_, progif_code);
329CONFIGFS_ATTR(pci_epf_, subclass_code);
330CONFIGFS_ATTR(pci_epf_, baseclass_code);
331CONFIGFS_ATTR(pci_epf_, cache_line_size);
332CONFIGFS_ATTR(pci_epf_, subsys_vendor_id);
333CONFIGFS_ATTR(pci_epf_, subsys_id);
334CONFIGFS_ATTR(pci_epf_, interrupt_pin);
335CONFIGFS_ATTR(pci_epf_, msi_interrupts);
336
337static struct configfs_attribute *pci_epf_attrs[] = {
338 &pci_epf_attr_vendorid,
339 &pci_epf_attr_deviceid,
340 &pci_epf_attr_revid,
341 &pci_epf_attr_progif_code,
342 &pci_epf_attr_subclass_code,
343 &pci_epf_attr_baseclass_code,
344 &pci_epf_attr_cache_line_size,
345 &pci_epf_attr_subsys_vendor_id,
346 &pci_epf_attr_subsys_id,
347 &pci_epf_attr_interrupt_pin,
348 &pci_epf_attr_msi_interrupts,
349 NULL,
350};
351
352static void pci_epf_release(struct config_item *item)
353{
354 struct pci_epf_group *epf_group = to_pci_epf_group(item);
355
356 pci_epf_destroy(epf_group->epf);
357 kfree(epf_group);
358}
359
360static struct configfs_item_operations pci_epf_ops = {
361 .release = pci_epf_release,
362};
363
364static struct config_item_type pci_epf_type = {
365 .ct_item_ops = &pci_epf_ops,
366 .ct_attrs = pci_epf_attrs,
367 .ct_owner = THIS_MODULE,
368};
369
370static struct config_group *pci_epf_make(struct config_group *group,
371 const char *name)
372{
373 struct pci_epf_group *epf_group;
374 struct pci_epf *epf;
375
376 epf_group = kzalloc(sizeof(*epf_group), GFP_KERNEL);
377 if (!epf_group)
378 return ERR_PTR(-ENOMEM);
379
380 config_group_init_type_name(&epf_group->group, name, &pci_epf_type);
381
382 epf = pci_epf_create(group->cg_item.ci_name);
383 if (IS_ERR(epf)) {
384 pr_err("failed to create endpoint function device\n");
385 return ERR_PTR(-EINVAL);
386 }
387
388 epf_group->epf = epf;
389
390 return &epf_group->group;
391}
392
393static void pci_epf_drop(struct config_group *group, struct config_item *item)
394{
395 config_item_put(item);
396}
397
398static struct configfs_group_operations pci_epf_group_ops = {
399 .make_group = &pci_epf_make,
400 .drop_item = &pci_epf_drop,
401};
402
403static struct config_item_type pci_epf_group_type = {
404 .ct_group_ops = &pci_epf_group_ops,
405 .ct_owner = THIS_MODULE,
406};
407
408struct config_group *pci_ep_cfs_add_epf_group(const char *name)
409{
410 struct config_group *group;
411
412 group = configfs_register_default_group(functions_group, name,
413 &pci_epf_group_type);
414 if (IS_ERR(group))
415 pr_err("failed to register configfs group for %s function\n",
416 name);
417
418 return group;
419}
420EXPORT_SYMBOL(pci_ep_cfs_add_epf_group);
421
422void pci_ep_cfs_remove_epf_group(struct config_group *group)
423{
424 if (IS_ERR_OR_NULL(group))
425 return;
426
427 configfs_unregister_default_group(group);
428}
429EXPORT_SYMBOL(pci_ep_cfs_remove_epf_group);
430
431static struct config_item_type pci_functions_type = {
432 .ct_owner = THIS_MODULE,
433};
434
435static struct config_item_type pci_controllers_type = {
436 .ct_owner = THIS_MODULE,
437};
438
439static struct config_item_type pci_ep_type = {
440 .ct_owner = THIS_MODULE,
441};
442
443static struct configfs_subsystem pci_ep_cfs_subsys = {
444 .su_group = {
445 .cg_item = {
446 .ci_namebuf = "pci_ep",
447 .ci_type = &pci_ep_type,
448 },
449 },
450 .su_mutex = __MUTEX_INITIALIZER(pci_ep_cfs_subsys.su_mutex),
451};
452
453static int __init pci_ep_cfs_init(void)
454{
455 int ret;
456 struct config_group *root = &pci_ep_cfs_subsys.su_group;
457
458 config_group_init(root);
459
460 ret = configfs_register_subsystem(&pci_ep_cfs_subsys);
461 if (ret) {
462 pr_err("Error %d while registering subsystem %s\n",
463 ret, root->cg_item.ci_namebuf);
464 goto err;
465 }
466
467 functions_group = configfs_register_default_group(root, "functions",
468 &pci_functions_type);
469 if (IS_ERR(functions_group)) {
470 ret = PTR_ERR(functions_group);
471 pr_err("Error %d while registering functions group\n",
472 ret);
473 goto err_functions_group;
474 }
475
476 controllers_group =
477 configfs_register_default_group(root, "controllers",
478 &pci_controllers_type);
479 if (IS_ERR(controllers_group)) {
480 ret = PTR_ERR(controllers_group);
481 pr_err("Error %d while registering controllers group\n",
482 ret);
483 goto err_controllers_group;
484 }
485
486 return 0;
487
488err_controllers_group:
489 configfs_unregister_default_group(functions_group);
490
491err_functions_group:
492 configfs_unregister_subsystem(&pci_ep_cfs_subsys);
493
494err:
495 return ret;
496}
497module_init(pci_ep_cfs_init);
498
499static void __exit pci_ep_cfs_exit(void)
500{
501 configfs_unregister_default_group(controllers_group);
502 configfs_unregister_default_group(functions_group);
503 configfs_unregister_subsystem(&pci_ep_cfs_subsys);
504}
505module_exit(pci_ep_cfs_exit);
506
507MODULE_DESCRIPTION("PCI EP CONFIGFS");
508MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
509MODULE_LICENSE("GPL v2");
diff --git a/include/linux/pci-ep-cfs.h b/include/linux/pci-ep-cfs.h
new file mode 100644
index 000000000000..263b89ea5705
--- /dev/null
+++ b/include/linux/pci-ep-cfs.h
@@ -0,0 +1,41 @@
1/**
2 * PCI Endpoint ConfigFS header file
3 *
4 * Copyright (C) 2017 Texas Instruments
5 * Author: Kishon Vijay Abraham I <kishon@ti.com>
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 of
9 * the License as published by the Free Software Foundation.
10 */
11
12#ifndef __LINUX_PCI_EP_CFS_H
13#define __LINUX_PCI_EP_CFS_H
14
15#include <linux/configfs.h>
16
17#ifdef CONFIG_PCI_ENDPOINT_CONFIGFS
18struct config_group *pci_ep_cfs_add_epc_group(const char *name);
19void pci_ep_cfs_remove_epc_group(struct config_group *group);
20struct config_group *pci_ep_cfs_add_epf_group(const char *name);
21void pci_ep_cfs_remove_epf_group(struct config_group *group);
22#else
23static inline struct config_group *pci_ep_cfs_add_epc_group(const char *name)
24{
25 return 0;
26}
27
28static inline void pci_ep_cfs_remove_epc_group(struct config_group *group)
29{
30}
31
32static inline struct config_group *pci_ep_cfs_add_epf_group(const char *name)
33{
34 return 0;
35}
36
37static inline void pci_ep_cfs_remove_epf_group(struct config_group *group)
38{
39}
40#endif
41#endif /* __LINUX_PCI_EP_CFS_H */
generated by cgit v1.2.2 (git 2.25.0) at 2025-08-23 02:47:39 -0400