2 * configfs to configure the PCI endpoint
4 * Copyright (C) 2017 Texas Instruments
5 * Author: Kishon Vijay Abraham I <kishon@ti.com>
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.
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.
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/>.
20 #include <linux/module.h>
21 #include <linux/slab.h>
23 #include <linux/pci-epc.h>
24 #include <linux/pci-epf.h>
25 #include <linux/pci-ep-cfs.h>
27 static struct config_group *functions_group;
28 static struct config_group *controllers_group;
30 struct pci_epf_group {
31 struct config_group group;
35 struct pci_epc_group {
36 struct config_group group;
39 unsigned long function_num_map;
42 static inline struct pci_epf_group *to_pci_epf_group(struct config_item *item)
44 return container_of(to_config_group(item), struct pci_epf_group, group);
47 static inline struct pci_epc_group *to_pci_epc_group(struct config_item *item)
49 return container_of(to_config_group(item), struct pci_epc_group, group);
52 static ssize_t pci_epc_start_store(struct config_item *item, const char *page,
58 struct pci_epc_group *epc_group = to_pci_epc_group(item);
62 ret = kstrtobool(page, &start);
71 ret = pci_epc_start(epc);
73 dev_err(&epc->dev, "failed to start endpoint controller\n");
77 epc_group->start = start;
82 static ssize_t pci_epc_start_show(struct config_item *item, char *page)
84 return sprintf(page, "%d\n",
85 to_pci_epc_group(item)->start);
88 CONFIGFS_ATTR(pci_epc_, start);
90 static struct configfs_attribute *pci_epc_attrs[] = {
95 static int pci_epc_epf_link(struct config_item *epc_item,
96 struct config_item *epf_item)
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);
105 epc = epc_group->epc;
106 epf = epf_group->epf;
107 ret = pci_epc_add_epf(epc, epf);
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;
116 ret = pci_epf_bind(epf);
123 pci_epc_remove_epf(epc, epf);
126 clear_bit(func_no, &epc_group->function_num_map);
131 static void pci_epc_epf_unlink(struct config_item *epc_item,
132 struct config_item *epf_item)
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);
139 WARN_ON_ONCE(epc_group->start);
141 epc = epc_group->epc;
142 epf = epf_group->epf;
143 clear_bit(epf->func_no, &epc_group->function_num_map);
145 pci_epc_remove_epf(epc, epf);
148 static struct configfs_item_operations pci_epc_item_ops = {
149 .allow_link = pci_epc_epf_link,
150 .drop_link = pci_epc_epf_unlink,
153 static 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,
159 struct config_group *pci_ep_cfs_add_epc_group(const char *name)
163 struct config_group *group;
164 struct pci_epc_group *epc_group;
166 epc_group = kzalloc(sizeof(*epc_group), GFP_KERNEL);
172 group = &epc_group->group;
174 config_group_init_type_name(group, name, &pci_epc_type);
175 ret = configfs_register_group(controllers_group, group);
177 pr_err("failed to register configfs group for %s\n", name);
178 goto err_register_group;
181 epc = pci_epc_get(name);
187 epc_group->epc = epc;
192 configfs_unregister_group(group);
200 EXPORT_SYMBOL(pci_ep_cfs_add_epc_group);
202 void pci_ep_cfs_remove_epc_group(struct config_group *group)
204 struct pci_epc_group *epc_group;
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);
214 EXPORT_SYMBOL(pci_ep_cfs_remove_epc_group);
216 #define PCI_EPF_HEADER_R(_name) \
217 static ssize_t pci_epf_##_name##_show(struct config_item *item, char *page) \
219 struct pci_epf *epf = to_pci_epf_group(item)->epf; \
220 if (WARN_ON_ONCE(!epf->header)) \
222 return sprintf(page, "0x%04x\n", epf->header->_name); \
225 #define PCI_EPF_HEADER_W_u32(_name) \
226 static ssize_t pci_epf_##_name##_store(struct config_item *item, \
227 const char *page, size_t len) \
231 struct pci_epf *epf = to_pci_epf_group(item)->epf; \
232 if (WARN_ON_ONCE(!epf->header)) \
234 ret = kstrtou32(page, 0, &val); \
237 epf->header->_name = val; \
241 #define PCI_EPF_HEADER_W_u16(_name) \
242 static ssize_t pci_epf_##_name##_store(struct config_item *item, \
243 const char *page, size_t len) \
247 struct pci_epf *epf = to_pci_epf_group(item)->epf; \
248 if (WARN_ON_ONCE(!epf->header)) \
250 ret = kstrtou16(page, 0, &val); \
253 epf->header->_name = val; \
257 #define PCI_EPF_HEADER_W_u8(_name) \
258 static ssize_t pci_epf_##_name##_store(struct config_item *item, \
259 const char *page, size_t len) \
263 struct pci_epf *epf = to_pci_epf_group(item)->epf; \
264 if (WARN_ON_ONCE(!epf->header)) \
266 ret = kstrtou8(page, 0, &val); \
269 epf->header->_name = val; \
273 static ssize_t pci_epf_msi_interrupts_store(struct config_item *item,
274 const char *page, size_t len)
279 ret = kstrtou8(page, 0, &val);
283 to_pci_epf_group(item)->epf->msi_interrupts = val;
288 static ssize_t pci_epf_msi_interrupts_show(struct config_item *item,
291 return sprintf(page, "%d\n",
292 to_pci_epf_group(item)->epf->msi_interrupts);
295 PCI_EPF_HEADER_R(vendorid)
296 PCI_EPF_HEADER_W_u16(vendorid)
298 PCI_EPF_HEADER_R(deviceid)
299 PCI_EPF_HEADER_W_u16(deviceid)
301 PCI_EPF_HEADER_R(revid)
302 PCI_EPF_HEADER_W_u8(revid)
304 PCI_EPF_HEADER_R(progif_code)
305 PCI_EPF_HEADER_W_u8(progif_code)
307 PCI_EPF_HEADER_R(subclass_code)
308 PCI_EPF_HEADER_W_u8(subclass_code)
310 PCI_EPF_HEADER_R(baseclass_code)
311 PCI_EPF_HEADER_W_u8(baseclass_code)
313 PCI_EPF_HEADER_R(cache_line_size)
314 PCI_EPF_HEADER_W_u8(cache_line_size)
316 PCI_EPF_HEADER_R(subsys_vendor_id)
317 PCI_EPF_HEADER_W_u16(subsys_vendor_id)
319 PCI_EPF_HEADER_R(subsys_id)
320 PCI_EPF_HEADER_W_u16(subsys_id)
322 PCI_EPF_HEADER_R(interrupt_pin)
323 PCI_EPF_HEADER_W_u8(interrupt_pin)
325 CONFIGFS_ATTR(pci_epf_, vendorid);
326 CONFIGFS_ATTR(pci_epf_, deviceid);
327 CONFIGFS_ATTR(pci_epf_, revid);
328 CONFIGFS_ATTR(pci_epf_, progif_code);
329 CONFIGFS_ATTR(pci_epf_, subclass_code);
330 CONFIGFS_ATTR(pci_epf_, baseclass_code);
331 CONFIGFS_ATTR(pci_epf_, cache_line_size);
332 CONFIGFS_ATTR(pci_epf_, subsys_vendor_id);
333 CONFIGFS_ATTR(pci_epf_, subsys_id);
334 CONFIGFS_ATTR(pci_epf_, interrupt_pin);
335 CONFIGFS_ATTR(pci_epf_, msi_interrupts);
337 static struct configfs_attribute *pci_epf_attrs[] = {
338 &pci_epf_attr_vendorid,
339 &pci_epf_attr_deviceid,
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,
352 static void pci_epf_release(struct config_item *item)
354 struct pci_epf_group *epf_group = to_pci_epf_group(item);
356 pci_epf_destroy(epf_group->epf);
360 static struct configfs_item_operations pci_epf_ops = {
361 .release = pci_epf_release,
364 static 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,
370 static struct config_group *pci_epf_make(struct config_group *group,
373 struct pci_epf_group *epf_group;
376 epf_group = kzalloc(sizeof(*epf_group), GFP_KERNEL);
378 return ERR_PTR(-ENOMEM);
380 config_group_init_type_name(&epf_group->group, name, &pci_epf_type);
382 epf = pci_epf_create(group->cg_item.ci_name);
384 pr_err("failed to create endpoint function device\n");
385 return ERR_PTR(-EINVAL);
388 epf_group->epf = epf;
390 return &epf_group->group;
393 static void pci_epf_drop(struct config_group *group, struct config_item *item)
395 config_item_put(item);
398 static struct configfs_group_operations pci_epf_group_ops = {
399 .make_group = &pci_epf_make,
400 .drop_item = &pci_epf_drop,
403 static struct config_item_type pci_epf_group_type = {
404 .ct_group_ops = &pci_epf_group_ops,
405 .ct_owner = THIS_MODULE,
408 struct config_group *pci_ep_cfs_add_epf_group(const char *name)
410 struct config_group *group;
412 group = configfs_register_default_group(functions_group, name,
413 &pci_epf_group_type);
415 pr_err("failed to register configfs group for %s function\n",
420 EXPORT_SYMBOL(pci_ep_cfs_add_epf_group);
422 void pci_ep_cfs_remove_epf_group(struct config_group *group)
424 if (IS_ERR_OR_NULL(group))
427 configfs_unregister_default_group(group);
429 EXPORT_SYMBOL(pci_ep_cfs_remove_epf_group);
431 static struct config_item_type pci_functions_type = {
432 .ct_owner = THIS_MODULE,
435 static struct config_item_type pci_controllers_type = {
436 .ct_owner = THIS_MODULE,
439 static struct config_item_type pci_ep_type = {
440 .ct_owner = THIS_MODULE,
443 static struct configfs_subsystem pci_ep_cfs_subsys = {
446 .ci_namebuf = "pci_ep",
447 .ci_type = &pci_ep_type,
450 .su_mutex = __MUTEX_INITIALIZER(pci_ep_cfs_subsys.su_mutex),
453 static int __init pci_ep_cfs_init(void)
456 struct config_group *root = &pci_ep_cfs_subsys.su_group;
458 config_group_init(root);
460 ret = configfs_register_subsystem(&pci_ep_cfs_subsys);
462 pr_err("Error %d while registering subsystem %s\n",
463 ret, root->cg_item.ci_namebuf);
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",
473 goto err_functions_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",
483 goto err_controllers_group;
488 err_controllers_group:
489 configfs_unregister_default_group(functions_group);
492 configfs_unregister_subsystem(&pci_ep_cfs_subsys);
497 module_init(pci_ep_cfs_init);
499 static void __exit pci_ep_cfs_exit(void)
501 configfs_unregister_default_group(controllers_group);
502 configfs_unregister_default_group(functions_group);
503 configfs_unregister_subsystem(&pci_ep_cfs_subsys);
505 module_exit(pci_ep_cfs_exit);
507 MODULE_DESCRIPTION("PCI EP CONFIGFS");
508 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
509 MODULE_LICENSE("GPL v2");