510 lines
12 KiB
C
510 lines
12 KiB
C
/**
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* configfs to configure the PCI endpoint
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*
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* Copyright (C) 2017 Texas Instruments
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* Author: Kishon Vijay Abraham I <kishon@ti.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 of
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* the License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/pci-epc.h>
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#include <linux/pci-epf.h>
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#include <linux/pci-ep-cfs.h>
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static struct config_group *functions_group;
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static struct config_group *controllers_group;
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struct pci_epf_group {
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struct config_group group;
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struct pci_epf *epf;
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};
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struct pci_epc_group {
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struct config_group group;
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struct pci_epc *epc;
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bool start;
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unsigned long function_num_map;
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};
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static inline struct pci_epf_group *to_pci_epf_group(struct config_item *item)
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{
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return container_of(to_config_group(item), struct pci_epf_group, group);
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}
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static inline struct pci_epc_group *to_pci_epc_group(struct config_item *item)
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{
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return container_of(to_config_group(item), struct pci_epc_group, group);
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}
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static ssize_t pci_epc_start_store(struct config_item *item, const char *page,
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size_t len)
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{
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int ret;
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bool start;
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struct pci_epc *epc;
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struct pci_epc_group *epc_group = to_pci_epc_group(item);
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epc = epc_group->epc;
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ret = kstrtobool(page, &start);
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if (ret)
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return ret;
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if (!start) {
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pci_epc_stop(epc);
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return len;
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}
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ret = pci_epc_start(epc);
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if (ret) {
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dev_err(&epc->dev, "failed to start endpoint controller\n");
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return -EINVAL;
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}
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epc_group->start = start;
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return len;
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}
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static ssize_t pci_epc_start_show(struct config_item *item, char *page)
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{
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return sprintf(page, "%d\n",
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to_pci_epc_group(item)->start);
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}
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CONFIGFS_ATTR(pci_epc_, start);
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static struct configfs_attribute *pci_epc_attrs[] = {
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&pci_epc_attr_start,
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NULL,
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};
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static int pci_epc_epf_link(struct config_item *epc_item,
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struct config_item *epf_item)
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{
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int ret;
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u32 func_no = 0;
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struct pci_epc *epc;
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struct pci_epf *epf;
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struct pci_epf_group *epf_group = to_pci_epf_group(epf_item);
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struct pci_epc_group *epc_group = to_pci_epc_group(epc_item);
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epc = epc_group->epc;
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epf = epf_group->epf;
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ret = pci_epc_add_epf(epc, epf);
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if (ret)
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goto err_add_epf;
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func_no = find_first_zero_bit(&epc_group->function_num_map,
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sizeof(epc_group->function_num_map));
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set_bit(func_no, &epc_group->function_num_map);
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epf->func_no = func_no;
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ret = pci_epf_bind(epf);
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if (ret)
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goto err_epf_bind;
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return 0;
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err_epf_bind:
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pci_epc_remove_epf(epc, epf);
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err_add_epf:
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clear_bit(func_no, &epc_group->function_num_map);
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return ret;
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}
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static void pci_epc_epf_unlink(struct config_item *epc_item,
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struct config_item *epf_item)
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{
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struct pci_epc *epc;
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struct pci_epf *epf;
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struct pci_epf_group *epf_group = to_pci_epf_group(epf_item);
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struct pci_epc_group *epc_group = to_pci_epc_group(epc_item);
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WARN_ON_ONCE(epc_group->start);
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epc = epc_group->epc;
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epf = epf_group->epf;
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clear_bit(epf->func_no, &epc_group->function_num_map);
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pci_epf_unbind(epf);
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pci_epc_remove_epf(epc, epf);
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}
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static struct configfs_item_operations pci_epc_item_ops = {
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.allow_link = pci_epc_epf_link,
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.drop_link = pci_epc_epf_unlink,
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};
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static const struct config_item_type pci_epc_type = {
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.ct_item_ops = &pci_epc_item_ops,
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.ct_attrs = pci_epc_attrs,
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.ct_owner = THIS_MODULE,
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};
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struct config_group *pci_ep_cfs_add_epc_group(const char *name)
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{
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int ret;
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struct pci_epc *epc;
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struct config_group *group;
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struct pci_epc_group *epc_group;
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epc_group = kzalloc(sizeof(*epc_group), GFP_KERNEL);
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if (!epc_group) {
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ret = -ENOMEM;
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goto err;
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}
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group = &epc_group->group;
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config_group_init_type_name(group, name, &pci_epc_type);
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ret = configfs_register_group(controllers_group, group);
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if (ret) {
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pr_err("failed to register configfs group for %s\n", name);
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goto err_register_group;
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}
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epc = pci_epc_get(name);
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if (IS_ERR(epc)) {
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ret = PTR_ERR(epc);
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goto err_epc_get;
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}
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epc_group->epc = epc;
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return group;
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err_epc_get:
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configfs_unregister_group(group);
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err_register_group:
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kfree(epc_group);
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err:
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL(pci_ep_cfs_add_epc_group);
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void pci_ep_cfs_remove_epc_group(struct config_group *group)
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{
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struct pci_epc_group *epc_group;
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if (!group)
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return;
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epc_group = container_of(group, struct pci_epc_group, group);
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pci_epc_put(epc_group->epc);
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configfs_unregister_group(&epc_group->group);
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kfree(epc_group);
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}
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EXPORT_SYMBOL(pci_ep_cfs_remove_epc_group);
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#define PCI_EPF_HEADER_R(_name) \
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static ssize_t pci_epf_##_name##_show(struct config_item *item, char *page) \
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{ \
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struct pci_epf *epf = to_pci_epf_group(item)->epf; \
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if (WARN_ON_ONCE(!epf->header)) \
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return -EINVAL; \
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return sprintf(page, "0x%04x\n", epf->header->_name); \
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}
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#define PCI_EPF_HEADER_W_u32(_name) \
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static ssize_t pci_epf_##_name##_store(struct config_item *item, \
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const char *page, size_t len) \
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{ \
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u32 val; \
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int ret; \
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struct pci_epf *epf = to_pci_epf_group(item)->epf; \
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if (WARN_ON_ONCE(!epf->header)) \
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return -EINVAL; \
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ret = kstrtou32(page, 0, &val); \
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if (ret) \
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return ret; \
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epf->header->_name = val; \
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return len; \
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}
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#define PCI_EPF_HEADER_W_u16(_name) \
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static ssize_t pci_epf_##_name##_store(struct config_item *item, \
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const char *page, size_t len) \
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{ \
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u16 val; \
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int ret; \
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struct pci_epf *epf = to_pci_epf_group(item)->epf; \
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if (WARN_ON_ONCE(!epf->header)) \
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return -EINVAL; \
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ret = kstrtou16(page, 0, &val); \
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if (ret) \
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return ret; \
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epf->header->_name = val; \
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return len; \
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}
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#define PCI_EPF_HEADER_W_u8(_name) \
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static ssize_t pci_epf_##_name##_store(struct config_item *item, \
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const char *page, size_t len) \
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{ \
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u8 val; \
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int ret; \
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struct pci_epf *epf = to_pci_epf_group(item)->epf; \
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if (WARN_ON_ONCE(!epf->header)) \
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return -EINVAL; \
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ret = kstrtou8(page, 0, &val); \
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if (ret) \
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return ret; \
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epf->header->_name = val; \
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return len; \
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}
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static ssize_t pci_epf_msi_interrupts_store(struct config_item *item,
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const char *page, size_t len)
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{
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u8 val;
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int ret;
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ret = kstrtou8(page, 0, &val);
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if (ret)
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return ret;
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to_pci_epf_group(item)->epf->msi_interrupts = val;
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return len;
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}
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static ssize_t pci_epf_msi_interrupts_show(struct config_item *item,
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char *page)
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{
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return sprintf(page, "%d\n",
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to_pci_epf_group(item)->epf->msi_interrupts);
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}
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PCI_EPF_HEADER_R(vendorid)
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PCI_EPF_HEADER_W_u16(vendorid)
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PCI_EPF_HEADER_R(deviceid)
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PCI_EPF_HEADER_W_u16(deviceid)
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PCI_EPF_HEADER_R(revid)
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PCI_EPF_HEADER_W_u8(revid)
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PCI_EPF_HEADER_R(progif_code)
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PCI_EPF_HEADER_W_u8(progif_code)
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PCI_EPF_HEADER_R(subclass_code)
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PCI_EPF_HEADER_W_u8(subclass_code)
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PCI_EPF_HEADER_R(baseclass_code)
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PCI_EPF_HEADER_W_u8(baseclass_code)
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PCI_EPF_HEADER_R(cache_line_size)
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PCI_EPF_HEADER_W_u8(cache_line_size)
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PCI_EPF_HEADER_R(subsys_vendor_id)
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PCI_EPF_HEADER_W_u16(subsys_vendor_id)
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PCI_EPF_HEADER_R(subsys_id)
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PCI_EPF_HEADER_W_u16(subsys_id)
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PCI_EPF_HEADER_R(interrupt_pin)
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PCI_EPF_HEADER_W_u8(interrupt_pin)
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CONFIGFS_ATTR(pci_epf_, vendorid);
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CONFIGFS_ATTR(pci_epf_, deviceid);
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CONFIGFS_ATTR(pci_epf_, revid);
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CONFIGFS_ATTR(pci_epf_, progif_code);
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CONFIGFS_ATTR(pci_epf_, subclass_code);
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CONFIGFS_ATTR(pci_epf_, baseclass_code);
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CONFIGFS_ATTR(pci_epf_, cache_line_size);
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CONFIGFS_ATTR(pci_epf_, subsys_vendor_id);
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CONFIGFS_ATTR(pci_epf_, subsys_id);
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CONFIGFS_ATTR(pci_epf_, interrupt_pin);
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CONFIGFS_ATTR(pci_epf_, msi_interrupts);
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static struct configfs_attribute *pci_epf_attrs[] = {
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&pci_epf_attr_vendorid,
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&pci_epf_attr_deviceid,
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&pci_epf_attr_revid,
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&pci_epf_attr_progif_code,
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&pci_epf_attr_subclass_code,
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&pci_epf_attr_baseclass_code,
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&pci_epf_attr_cache_line_size,
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&pci_epf_attr_subsys_vendor_id,
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&pci_epf_attr_subsys_id,
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&pci_epf_attr_interrupt_pin,
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&pci_epf_attr_msi_interrupts,
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NULL,
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};
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static void pci_epf_release(struct config_item *item)
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{
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struct pci_epf_group *epf_group = to_pci_epf_group(item);
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pci_epf_destroy(epf_group->epf);
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kfree(epf_group);
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}
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static struct configfs_item_operations pci_epf_ops = {
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.release = pci_epf_release,
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};
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static const struct config_item_type pci_epf_type = {
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.ct_item_ops = &pci_epf_ops,
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.ct_attrs = pci_epf_attrs,
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.ct_owner = THIS_MODULE,
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};
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static struct config_group *pci_epf_make(struct config_group *group,
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const char *name)
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{
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struct pci_epf_group *epf_group;
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struct pci_epf *epf;
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epf_group = kzalloc(sizeof(*epf_group), GFP_KERNEL);
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if (!epf_group)
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return ERR_PTR(-ENOMEM);
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config_group_init_type_name(&epf_group->group, name, &pci_epf_type);
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epf = pci_epf_create(group->cg_item.ci_name);
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if (IS_ERR(epf)) {
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pr_err("failed to create endpoint function device\n");
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return ERR_PTR(-EINVAL);
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}
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epf_group->epf = epf;
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return &epf_group->group;
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}
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static void pci_epf_drop(struct config_group *group, struct config_item *item)
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{
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config_item_put(item);
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}
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static struct configfs_group_operations pci_epf_group_ops = {
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.make_group = &pci_epf_make,
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.drop_item = &pci_epf_drop,
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};
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static const struct config_item_type pci_epf_group_type = {
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.ct_group_ops = &pci_epf_group_ops,
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.ct_owner = THIS_MODULE,
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};
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struct config_group *pci_ep_cfs_add_epf_group(const char *name)
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{
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struct config_group *group;
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group = configfs_register_default_group(functions_group, name,
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&pci_epf_group_type);
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if (IS_ERR(group))
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pr_err("failed to register configfs group for %s function\n",
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name);
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return group;
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}
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EXPORT_SYMBOL(pci_ep_cfs_add_epf_group);
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void pci_ep_cfs_remove_epf_group(struct config_group *group)
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{
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if (IS_ERR_OR_NULL(group))
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return;
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configfs_unregister_default_group(group);
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}
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EXPORT_SYMBOL(pci_ep_cfs_remove_epf_group);
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static const struct config_item_type pci_functions_type = {
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.ct_owner = THIS_MODULE,
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};
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static const struct config_item_type pci_controllers_type = {
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.ct_owner = THIS_MODULE,
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};
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static const struct config_item_type pci_ep_type = {
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.ct_owner = THIS_MODULE,
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};
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static struct configfs_subsystem pci_ep_cfs_subsys = {
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.su_group = {
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.cg_item = {
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.ci_namebuf = "pci_ep",
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.ci_type = &pci_ep_type,
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},
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},
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.su_mutex = __MUTEX_INITIALIZER(pci_ep_cfs_subsys.su_mutex),
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};
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static int __init pci_ep_cfs_init(void)
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{
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int ret;
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struct config_group *root = &pci_ep_cfs_subsys.su_group;
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config_group_init(root);
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ret = configfs_register_subsystem(&pci_ep_cfs_subsys);
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if (ret) {
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pr_err("Error %d while registering subsystem %s\n",
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ret, root->cg_item.ci_namebuf);
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goto err;
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}
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functions_group = configfs_register_default_group(root, "functions",
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&pci_functions_type);
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if (IS_ERR(functions_group)) {
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ret = PTR_ERR(functions_group);
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pr_err("Error %d while registering functions group\n",
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ret);
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goto err_functions_group;
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}
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controllers_group =
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configfs_register_default_group(root, "controllers",
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&pci_controllers_type);
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if (IS_ERR(controllers_group)) {
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ret = PTR_ERR(controllers_group);
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pr_err("Error %d while registering controllers group\n",
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ret);
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goto err_controllers_group;
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}
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return 0;
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err_controllers_group:
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configfs_unregister_default_group(functions_group);
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err_functions_group:
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configfs_unregister_subsystem(&pci_ep_cfs_subsys);
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err:
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return ret;
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}
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module_init(pci_ep_cfs_init);
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static void __exit pci_ep_cfs_exit(void)
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{
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configfs_unregister_default_group(controllers_group);
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configfs_unregister_default_group(functions_group);
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configfs_unregister_subsystem(&pci_ep_cfs_subsys);
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}
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module_exit(pci_ep_cfs_exit);
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MODULE_DESCRIPTION("PCI EP CONFIGFS");
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MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
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MODULE_LICENSE("GPL v2");
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