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PCI: endpoint: Allow user to create sub-directory of 'EPF Device' directory

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Documentation/PCI/endpoint/pci-endpoint-cfs.rst explains how a user has to
create a directory in-order to create a 'EPF Device' that can be
configured/probed by 'EPF Driver'.

Allow user to create a sub-directory of 'EPF Device' directory for any
function specific attributes that has to be exposed to the user.

Link: https://lore.kernel.org/r/20210201195809.7342-11-kishon@ti.com
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Kishon Vijay Abraham I 2021-02-02 01:28:02 +05:30 committed by Bjorn Helgaas
parent 256ae47520
commit 38ad827e3b
2 changed files with 26 additions and 0 deletions
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23
drivers/pci/endpoint/pci-ep-cfs.c
View File

@ -490,7 +490,29 @@ static struct configfs_item_operations pci_epf_ops = {
.release = pci_epf_release, .release = pci_epf_release,
}; };
static struct config_group *pci_epf_type_make(struct config_group *group,
const char *name)
{
struct pci_epf_group *epf_group = to_pci_epf_group(&group->cg_item);
struct config_group *epf_type_group;
epf_type_group = pci_epf_type_add_cfs(epf_group->epf, group);
return epf_type_group;
}
static void pci_epf_type_drop(struct config_group *group,
struct config_item *item)
{
config_item_put(item);
}
static struct configfs_group_operations pci_epf_type_group_ops = {
.make_group = &pci_epf_type_make,
.drop_item = &pci_epf_type_drop,
};
static const struct config_item_type pci_epf_type = { static const struct config_item_type pci_epf_type = {
.ct_group_ops = &pci_epf_type_group_ops,
.ct_item_ops = &pci_epf_ops, .ct_item_ops = &pci_epf_ops,
.ct_attrs = pci_epf_attrs, .ct_attrs = pci_epf_attrs,
.ct_owner = THIS_MODULE, .ct_owner = THIS_MODULE,
@ -553,6 +575,7 @@ static struct config_group *pci_epf_make(struct config_group *group,
goto free_name; goto free_name;
} }
epf->group = &epf_group->group;
epf_group->epf = epf; epf_group->epf = epf;
kfree(epf_name); kfree(epf_name);

3
include/linux/pci-epf.h
View File

@ -9,6 +9,7 @@
#ifndef __LINUX_PCI_EPF_H #ifndef __LINUX_PCI_EPF_H
#define __LINUX_PCI_EPF_H #define __LINUX_PCI_EPF_H
#include <linux/configfs.h>
#include <linux/device.h> #include <linux/device.h>
#include <linux/mod_devicetable.h> #include <linux/mod_devicetable.h>
#include <linux/pci.h> #include <linux/pci.h>
@ -128,6 +129,7 @@ struct pci_epf_bar {
* EPC device * EPC device
* @sec_epc_bar: represents the BAR of EPF device associated with secondary EPC * @sec_epc_bar: represents the BAR of EPF device associated with secondary EPC
* @sec_epc_func_no: unique (physical) function number within the secondary EPC * @sec_epc_func_no: unique (physical) function number within the secondary EPC
* @group: configfs group associated with the EPF device
*/ */
struct pci_epf { struct pci_epf {
struct device dev; struct device dev;
@ -150,6 +152,7 @@ struct pci_epf {
struct list_head sec_epc_list; struct list_head sec_epc_list;
struct pci_epf_bar sec_epc_bar[6]; struct pci_epf_bar sec_epc_bar[6];
u8 sec_epc_func_no; u8 sec_epc_func_no;
struct config_group *group;
}; };
/** /**