Release 4.16 drivers/pci/endpoint/pci-ep-cfs.c
// SPDX-License-Identifier: GPL-2.0
/**
* configfs to configure the PCI endpoint
*
* Copyright (C) 2017 Texas Instruments
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*/
#include <linux/module.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/pci-epc.h>
#include <linux/pci-epf.h>
#include <linux/pci-ep-cfs.h>
static DEFINE_IDR(functions_idr);
static DEFINE_MUTEX(functions_mutex);
static struct config_group *functions_group;
static struct config_group *controllers_group;
struct pci_epf_group {
struct config_group group;
struct pci_epf *epf;
int index;
};
struct pci_epc_group {
struct config_group group;
struct pci_epc *epc;
bool start;
unsigned long function_num_map;
};
static inline struct pci_epf_group *to_pci_epf_group(struct config_item *item)
{
return container_of(to_config_group(item), struct pci_epf_group, group);
}
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static inline struct pci_epc_group *to_pci_epc_group(struct config_item *item)
{
return container_of(to_config_group(item), struct pci_epc_group, group);
}
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static ssize_t pci_epc_start_store(struct config_item *item, const char *page,
size_t len)
{
int ret;
bool start;
struct pci_epc *epc;
struct pci_epc_group *epc_group = to_pci_epc_group(item);
epc = epc_group->epc;
ret = kstrtobool(page, &start);
if (ret)
return ret;
if (!start) {
pci_epc_stop(epc);
return len;
}
ret = pci_epc_start(epc);
if (ret) {
dev_err(&epc->dev, "failed to start endpoint controller\n");
return -EINVAL;
}
epc_group->start = start;
return len;
}
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static ssize_t pci_epc_start_show(struct config_item *item, char *page)
{
return sprintf(page, "%d\n",
to_pci_epc_group(item)->start);
}
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CONFIGFS_ATTR(pci_epc_, start);
static struct configfs_attribute *pci_epc_attrs[] = {
&pci_epc_attr_start,
NULL,
};
static int pci_epc_epf_link(struct config_item *epc_item,
struct config_item *epf_item)
{
int ret;
u32 func_no = 0;
struct pci_epf_group *epf_group = to_pci_epf_group(epf_item);
struct pci_epc_group *epc_group = to_pci_epc_group(epc_item);
struct pci_epc *epc = epc_group->epc;
struct pci_epf *epf = epf_group->epf;
func_no = find_first_zero_bit(&epc_group->function_num_map,
BITS_PER_LONG);
if (func_no >= BITS_PER_LONG)
return -EINVAL;
set_bit(func_no, &epc_group->function_num_map);
epf->func_no = func_no;
ret = pci_epc_add_epf(epc, epf);
if (ret)
goto err_add_epf;
ret = pci_epf_bind(epf);
if (ret)
goto err_epf_bind;
return 0;
err_epf_bind:
pci_epc_remove_epf(epc, epf);
err_add_epf:
clear_bit(func_no, &epc_group->function_num_map);
return ret;
}
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static void pci_epc_epf_unlink(struct config_item *epc_item,
struct config_item *epf_item)
{
struct pci_epc *epc;
struct pci_epf *epf;
struct pci_epf_group *epf_group = to_pci_epf_group(epf_item);
struct pci_epc_group *epc_group = to_pci_epc_group(epc_item);
WARN_ON_ONCE(epc_group->start);
epc = epc_group->epc;
epf = epf_group->epf;
clear_bit(epf->func_no, &epc_group->function_num_map);
pci_epf_unbind(epf);
pci_epc_remove_epf(epc, epf);
}
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static struct configfs_item_operations pci_epc_item_ops = {
.allow_link = pci_epc_epf_link,
.drop_link = pci_epc_epf_unlink,
};
static const struct config_item_type pci_epc_type = {
.ct_item_ops = &pci_epc_item_ops,
.ct_attrs = pci_epc_attrs,
.ct_owner = THIS_MODULE,
};
struct config_group *pci_ep_cfs_add_epc_group(const char *name)
{
int ret;
struct pci_epc *epc;
struct config_group *group;
struct pci_epc_group *epc_group;
epc_group = kzalloc(sizeof(*epc_group), GFP_KERNEL);
if (!epc_group) {
ret = -ENOMEM;
goto err;
}
group = &epc_group->group;
config_group_init_type_name(group, name, &pci_epc_type);
ret = configfs_register_group(controllers_group, group);
if (ret) {
pr_err("failed to register configfs group for %s\n", name);
goto err_register_group;
}
epc = pci_epc_get(name);
if (IS_ERR(epc)) {
ret = PTR_ERR(epc);
goto err_epc_get;
}
epc_group->epc = epc;
return group;
err_epc_get:
configfs_unregister_group(group);
err_register_group:
kfree(epc_group);
err:
return ERR_PTR(ret);
}
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EXPORT_SYMBOL(pci_ep_cfs_add_epc_group);
void pci_ep_cfs_remove_epc_group(struct config_group *group)
{
struct pci_epc_group *epc_group;
if (!group)
return;
epc_group = container_of(group, struct pci_epc_group, group);
pci_epc_put(epc_group->epc);
configfs_unregister_group(&epc_group->group);
kfree(epc_group);
}
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EXPORT_SYMBOL(pci_ep_cfs_remove_epc_group);
#define PCI_EPF_HEADER_R(_name) \
static ssize_t pci_epf_##_name##_show(struct config_item *item, char *page) \
{ \
struct pci_epf *epf = to_pci_epf_group(item)->epf; \
if (WARN_ON_ONCE(!epf->header)) \
return -EINVAL; \
return sprintf(page, "0x%04x\n", epf->header->_name); \
}
#define PCI_EPF_HEADER_W_u32(_name) \
static ssize_t pci_epf_##_name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
u32 val; \
int ret; \
struct pci_epf *epf = to_pci_epf_group(item)->epf; \
if (WARN_ON_ONCE(!epf->header)) \
return -EINVAL; \
ret = kstrtou32(page, 0, &val); \
if (ret) \
return ret; \
epf->header->_name = val; \
return len; \
}
#define PCI_EPF_HEADER_W_u16(_name) \
static ssize_t pci_epf_##_name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
u16 val; \
int ret; \
struct pci_epf *epf = to_pci_epf_group(item)->epf; \
if (WARN_ON_ONCE(!epf->header)) \
return -EINVAL; \
ret = kstrtou16(page, 0, &val); \
if (ret) \
return ret; \
epf->header->_name = val; \
return len; \
}
#define PCI_EPF_HEADER_W_u8(_name) \
static ssize_t pci_epf_##_name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
u8 val; \
int ret; \
struct pci_epf *epf = to_pci_epf_group(item)->epf; \
if (WARN_ON_ONCE(!epf->header)) \
return -EINVAL; \
ret = kstrtou8(page, 0, &val); \
if (ret) \
return ret; \
epf->header->_name = val; \
return len; \
}
static ssize_t pci_epf_msi_interrupts_store(struct config_item *item,
const char *page, size_t len)
{
u8 val;
int ret;
ret = kstrtou8(page, 0, &val);
if (ret)
return ret;
to_pci_epf_group(item)->epf->msi_interrupts = val;
return len;
}
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static ssize_t pci_epf_msi_interrupts_show(struct config_item *item,
char *page)
{
return sprintf(page, "%d\n",
to_pci_epf_group(item)->epf->msi_interrupts);
}
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PCI_EPF_HEADER_R(vendorid)
PCI_EPF_HEADER_W_u16(vendorid)
PCI_EPF_HEADER_R(deviceid)
PCI_EPF_HEADER_W_u16(deviceid)
PCI_EPF_HEADER_R(revid)
PCI_EPF_HEADER_W_u8(revid)
PCI_EPF_HEADER_R(progif_code)
PCI_EPF_HEADER_W_u8(progif_code)
PCI_EPF_HEADER_R(subclass_code)
PCI_EPF_HEADER_W_u8(subclass_code)
PCI_EPF_HEADER_R(baseclass_code)
PCI_EPF_HEADER_W_u8(baseclass_code)
PCI_EPF_HEADER_R(cache_line_size)
PCI_EPF_HEADER_W_u8(cache_line_size)
PCI_EPF_HEADER_R(subsys_vendor_id)
PCI_EPF_HEADER_W_u16(subsys_vendor_id)
PCI_EPF_HEADER_R(subsys_id)
PCI_EPF_HEADER_W_u16(subsys_id)
PCI_EPF_HEADER_R(interrupt_pin)
PCI_EPF_HEADER_W_u8(interrupt_pin)
CONFIGFS_ATTR(pci_epf_, vendorid);
CONFIGFS_ATTR(pci_epf_, deviceid);
CONFIGFS_ATTR(pci_epf_, revid);
CONFIGFS_ATTR(pci_epf_, progif_code);
CONFIGFS_ATTR(pci_epf_, subclass_code);
CONFIGFS_ATTR(pci_epf_, baseclass_code);
CONFIGFS_ATTR(pci_epf_, cache_line_size);
CONFIGFS_ATTR(pci_epf_, subsys_vendor_id);
CONFIGFS_ATTR(pci_epf_, subsys_id);
CONFIGFS_ATTR(pci_epf_, interrupt_pin);
CONFIGFS_ATTR(pci_epf_, msi_interrupts);
static struct configfs_attribute *pci_epf_attrs[] = {
&pci_epf_attr_vendorid,
&pci_epf_attr_deviceid,
&pci_epf_attr_revid,
&pci_epf_attr_progif_code,
&pci_epf_attr_subclass_code,
&pci_epf_attr_baseclass_code,
&pci_epf_attr_cache_line_size,
&pci_epf_attr_subsys_vendor_id,
&pci_epf_attr_subsys_id,
&pci_epf_attr_interrupt_pin,
&pci_epf_attr_msi_interrupts,
NULL,
};
static void pci_epf_release(struct config_item *item)
{
struct pci_epf_group *epf_group = to_pci_epf_group(item);
mutex_lock(&functions_mutex);
idr_remove(&functions_idr, epf_group->index);
mutex_unlock(&functions_mutex);
pci_epf_destroy(epf_group->epf);
kfree(epf_group);
}
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static struct configfs_item_operations pci_epf_ops = {
.release = pci_epf_release,
};
static const struct config_item_type pci_epf_type = {
.ct_item_ops = &pci_epf_ops,
.ct_attrs = pci_epf_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_group *pci_epf_make(struct config_group *group,
const char *name)
{
struct pci_epf_group *epf_group;
struct pci_epf *epf;
char *epf_name;
int index, err;
epf_group = kzalloc(sizeof(*epf_group), GFP_KERNEL);
if (!epf_group)
return ERR_PTR(-ENOMEM);
mutex_lock(&functions_mutex);
index = idr_alloc(&functions_idr, epf_group, 0, 0, GFP_KERNEL);
mutex_unlock(&functions_mutex);
if (index < 0) {
err = index;
goto free_group;
}
epf_group->index = index;
config_group_init_type_name(&epf_group->group, name, &pci_epf_type);
epf_name = kasprintf(GFP_KERNEL, "%s.%d",
group->cg_item.ci_name, epf_group->index);
if (!epf_name) {
err = -ENOMEM;
goto remove_idr;
}
epf = pci_epf_create(epf_name);
if (IS_ERR(epf)) {
pr_err("failed to create endpoint function device\n");
err = -EINVAL;
goto free_name;
}
epf_group->epf = epf;
kfree(epf_name);
return &epf_group->group;
free_name:
kfree(epf_name);
remove_idr:
mutex_lock(&functions_mutex);
idr_remove(&functions_idr, epf_group->index);
mutex_unlock(&functions_mutex);
free_group:
kfree(epf_group);
return ERR_PTR(err);
}
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static void pci_epf_drop(struct config_group *group, struct config_item *item)
{
config_item_put(item);
}
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static struct configfs_group_operations pci_epf_group_ops = {
.make_group = &pci_epf_make,
.drop_item = &pci_epf_drop,
};
static const struct config_item_type pci_epf_group_type = {
.ct_group_ops = &pci_epf_group_ops,
.ct_owner = THIS_MODULE,
};
struct config_group *pci_ep_cfs_add_epf_group(const char *name)
{
struct config_group *group;
group = configfs_register_default_group(functions_group, name,
&pci_epf_group_type);
if (IS_ERR(group))
pr_err("failed to register configfs group for %s function\n",
name);
return group;
}
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EXPORT_SYMBOL(pci_ep_cfs_add_epf_group);
void pci_ep_cfs_remove_epf_group(struct config_group *group)
{
if (IS_ERR_OR_NULL(group))
return;
configfs_unregister_default_group(group);
}
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EXPORT_SYMBOL(pci_ep_cfs_remove_epf_group);
static const struct config_item_type pci_functions_type = {
.ct_owner = THIS_MODULE,
};
static const struct config_item_type pci_controllers_type = {
.ct_owner = THIS_MODULE,
};
static const struct config_item_type pci_ep_type = {
.ct_owner = THIS_MODULE,
};
static struct configfs_subsystem pci_ep_cfs_subsys = {
.su_group = {
.cg_item = {
.ci_namebuf = "pci_ep",
.ci_type = &pci_ep_type,
},
},
.su_mutex = __MUTEX_INITIALIZER(pci_ep_cfs_subsys.su_mutex),
};
static int __init pci_ep_cfs_init(void)
{
int ret;
struct config_group *root = &pci_ep_cfs_subsys.su_group;
config_group_init(root);
ret = configfs_register_subsystem(&pci_ep_cfs_subsys);
if (ret) {
pr_err("Error %d while registering subsystem %s\n",
ret, root->cg_item.ci_namebuf);
goto err;
}
functions_group = configfs_register_default_group(root, "functions",
&pci_functions_type);
if (IS_ERR(functions_group)) {
ret = PTR_ERR(functions_group);
pr_err("Error %d while registering functions group\n",
ret);
goto err_functions_group;
}
controllers_group =
configfs_register_default_group(root, "controllers",
&pci_controllers_type);
if (IS_ERR(controllers_group)) {
ret = PTR_ERR(controllers_group);
pr_err("Error %d while registering controllers group\n",
ret);
goto err_controllers_group;
}
return 0;
err_controllers_group:
configfs_unregister_default_group(functions_group);
err_functions_group:
configfs_unregister_subsystem(&pci_ep_cfs_subsys);
err:
return ret;
}
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module_init(pci_ep_cfs_init);
static void __exit pci_ep_cfs_exit(void)
{
configfs_unregister_default_group(controllers_group);
configfs_unregister_default_group(functions_group);
configfs_unregister_subsystem(&pci_ep_cfs_subsys);
}
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module_exit(pci_ep_cfs_exit);
MODULE_DESCRIPTION("PCI EP CONFIGFS");
MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
MODULE_LICENSE("GPL v2");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kishon Vijay Abraham I | 1663 | 87.85% | 1 | 16.67% |
| Cyrille Pitchen | 185 | 9.77% | 1 | 16.67% |
| Niklas Cassel | 37 | 1.95% | 2 | 33.33% |
| Bhumika Goyal | 6 | 0.32% | 1 | 16.67% |
| Björn Helgaas | 2 | 0.11% | 1 | 16.67% |
| Total | 1893 | 100.00% | 6 | 100.00% |
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