PCI: endpoint: Add EP core layer to enable EP controller and EP functions

Introduce a new EP core layer in order to support endpoint functions in
linux kernel. This comprises the EPC library (Endpoint Controller Library)
and EPF library (Endpoint Function Library). EPC library implements
functions specific to an endpoint controller and EPF library implements
functions specific to an endpoint function.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/Makefile

@@ -14,7 +14,9 @@ obj-$(CONFIG_GENERIC_PHY)	+= phy/
 obj-$(CONFIG_PINCTRL)		+= pinctrl/
 obj-$(CONFIG_GPIOLIB)		+= gpio/
 obj-y				+= pwm/
+
 obj-$(CONFIG_PCI)		+= pci/
+obj-$(CONFIG_PCI_ENDPOINT)	+= pci/endpoint/
 # PCI dwc controller drivers
 obj-y				+= pci/dwc/
 

drivers/pci/Kconfig

@@ -134,3 +134,4 @@ config PCI_HYPERV
 source "drivers/pci/hotplug/Kconfig"
 source "drivers/pci/dwc/Kconfig"
 source "drivers/pci/host/Kconfig"
+source "drivers/pci/endpoint/Kconfig"

drivers/pci/endpoint/Kconfig

+#
+# PCI Endpoint Support
+#
+
+menu "PCI Endpoint"
+
+config PCI_ENDPOINT
+	bool "PCI Endpoint Support"
+	help
+	   Enable this configuration option to support configurable PCI
+	   endpoint. This should be enabled if the platform has a PCI
+	   controller that can operate in endpoint mode.
+
+	   Enabling this option will build the endpoint library, which
+	   includes endpoint controller library and endpoint function
+	   library.
+
+	   If in doubt, say "N" to disable Endpoint support.
+
+endmenu

drivers/pci/endpoint/Makefile

+#
+# Makefile for PCI Endpoint Support
+#
+
+obj-$(CONFIG_PCI_ENDPOINT)		+= pci-epc-core.o pci-epf-core.o\
+					   pci-epc-mem.o

drivers/pci/endpoint/pci-epc-mem.c

+/**
+ * PCI Endpoint *Controller* Address Space Management
+ *
+ * Copyright (C) 2017 Texas Instruments
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <linux/pci-epc.h>
+
+/**
+ * pci_epc_mem_init() - initialize the pci_epc_mem structure
+ * @epc: the EPC device that invoked pci_epc_mem_init
+ * @phys_base: the physical address of the base
+ * @size: the size of the address space
+ *
+ * Invoke to initialize the pci_epc_mem structure used by the
+ * endpoint functions to allocate mapped PCI address.
+ */
+int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_base, size_t size)
+{
+	int ret;
+	struct pci_epc_mem *mem;
+	unsigned long *bitmap;
+	int pages = size >> PAGE_SHIFT;
+	int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
+
+	mem = kzalloc(sizeof(*mem), GFP_KERNEL);
+	if (!mem) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	bitmap = kzalloc(bitmap_size, GFP_KERNEL);
+	if (!bitmap) {
+		ret = -ENOMEM;
+		goto err_mem;
+	}
+
+	mem->bitmap = bitmap;
+	mem->phys_base = phys_base;
+	mem->pages = pages;
+	mem->size = size;
+
+	epc->mem = mem;
+
+	return 0;
+
+err_mem:
+	kfree(mem);
+
+err:
+return ret;
+}
+EXPORT_SYMBOL_GPL(pci_epc_mem_init);
+
+/**
+ * pci_epc_mem_exit() - cleanup the pci_epc_mem structure
+ * @epc: the EPC device that invoked pci_epc_mem_exit
+ *
+ * Invoke to cleanup the pci_epc_mem structure allocated in
+ * pci_epc_mem_init().
+ */
+void pci_epc_mem_exit(struct pci_epc *epc)
+{
+	struct pci_epc_mem *mem = epc->mem;
+
+	epc->mem = NULL;
+	kfree(mem->bitmap);
+	kfree(mem);
+}
+EXPORT_SYMBOL_GPL(pci_epc_mem_exit);
+
+/**
+ * pci_epc_mem_alloc_addr() - allocate memory address from EPC addr space
+ * @epc: the EPC device on which memory has to be allocated
+ * @phys_addr: populate the allocated physical address here
+ * @size: the size of the address space that has to be allocated
+ *
+ * Invoke to allocate memory address from the EPC address space. This
+ * is usually done to map the remote RC address into the local system.
+ */
+void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
+				     phys_addr_t *phys_addr, size_t size)
+{
+	int pageno;
+	void __iomem *virt_addr;
+	struct pci_epc_mem *mem = epc->mem;
+	int order = get_order(size);
+
+	pageno = bitmap_find_free_region(mem->bitmap, mem->pages, order);
+	if (pageno < 0)
+		return NULL;
+
+	*phys_addr = mem->phys_base + (pageno << PAGE_SHIFT);
+	virt_addr = ioremap(*phys_addr, size);
+	if (!virt_addr)
+		bitmap_release_region(mem->bitmap, pageno, order);
+
+	return virt_addr;
+}
+EXPORT_SYMBOL_GPL(pci_epc_mem_alloc_addr);
+
+/**
+ * pci_epc_mem_free_addr() - free the allocated memory address
+ * @epc: the EPC device on which memory was allocated
+ * @phys_addr: the allocated physical address
+ * @virt_addr: virtual address of the allocated mem space
+ * @size: the size of the allocated address space
+ *
+ * Invoke to free the memory allocated using pci_epc_mem_alloc_addr.
+ */
+void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
+			   void __iomem *virt_addr, size_t size)
+{
+	int pageno;
+	int order = get_order(size);
+	struct pci_epc_mem *mem = epc->mem;
+
+	iounmap(virt_addr);
+	pageno = (phys_addr - mem->phys_base) >> PAGE_SHIFT;
+	bitmap_release_region(mem->bitmap, pageno, order);
+}
+EXPORT_SYMBOL_GPL(pci_epc_mem_free_addr);
+
+MODULE_DESCRIPTION("PCI EPC Address Space Management");
+MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
+MODULE_LICENSE("GPL v2");

drivers/pci/endpoint/pci-epf-core.c

+/**
+ * PCI Endpoint *Function* (EPF) library
+ *
+ * Copyright (C) 2017 Texas Instruments
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#include <linux/pci-epc.h>
+#include <linux/pci-epf.h>
+
+static struct bus_type pci_epf_bus_type;
+static struct device_type pci_epf_type;
+
+/**
+ * pci_epf_linkup() - Notify the function driver that EPC device has
+ *		      established a connection with the Root Complex.
+ * @epf: the EPF device bound to the EPC device which has established
+ *	 the connection with the host
+ *
+ * Invoke to notify the function driver that EPC device has established
+ * a connection with the Root Complex.
+ */
+void pci_epf_linkup(struct pci_epf *epf)
+{
+	if (!epf->driver) {
+		dev_WARN(&epf->dev, "epf device not bound to driver\n");
+		return;
+	}
+
+	epf->driver->ops->linkup(epf);
+}
+EXPORT_SYMBOL_GPL(pci_epf_linkup);
+
+/**
+ * pci_epf_unbind() - Notify the function driver that the binding between the
+ *		      EPF device and EPC device has been lost
+ * @epf: the EPF device which has lost the binding with the EPC device
+ *
+ * Invoke to notify the function driver that the binding between the EPF device
+ * and EPC device has been lost.
+ */
+void pci_epf_unbind(struct pci_epf *epf)
+{
+	if (!epf->driver) {
+		dev_WARN(&epf->dev, "epf device not bound to driver\n");
+		return;
+	}
+
+	epf->driver->ops->unbind(epf);
+	module_put(epf->driver->owner);
+}
+EXPORT_SYMBOL_GPL(pci_epf_unbind);
+
+/**
+ * pci_epf_bind() - Notify the function driver that the EPF device has been
+ *		    bound to a EPC device
+ * @epf: the EPF device which has been bound to the EPC device
+ *
+ * Invoke to notify the function driver that it has been bound to a EPC device
+ */
+int pci_epf_bind(struct pci_epf *epf)
+{
+	if (!epf->driver) {
+		dev_WARN(&epf->dev, "epf device not bound to driver\n");
+		return -EINVAL;
+	}
+
+	if (!try_module_get(epf->driver->owner))
+		return -EAGAIN;
+
+	return epf->driver->ops->bind(epf);
+}
+EXPORT_SYMBOL_GPL(pci_epf_bind);
+
+/**
+ * pci_epf_free_space() - free the allocated PCI EPF register space
+ * @addr: the virtual address of the PCI EPF register space
+ * @bar: the BAR number corresponding to the register space
+ *
+ * Invoke to free the allocated PCI EPF register space.
+ */
+void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar)
+{
+	struct device *dev = &epf->dev;
+
+	if (!addr)
+		return;
+
+	dma_free_coherent(dev, epf->bar[bar].size, addr,
+			  epf->bar[bar].phys_addr);
+
+	epf->bar[bar].phys_addr = 0;
+	epf->bar[bar].size = 0;
+}
+EXPORT_SYMBOL_GPL(pci_epf_free_space);
+
+/**
+ * pci_epf_alloc_space() - allocate memory for the PCI EPF register space
+ * @size: the size of the memory that has to be allocated
+ * @bar: the BAR number corresponding to the allocated register space
+ *
+ * Invoke to allocate memory for the PCI EPF register space.
+ */
+void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar)
+{
+	void *space;
+	struct device *dev = &epf->dev;
+	dma_addr_t phys_addr;
+
+	if (size < 128)
+		size = 128;
+	size = roundup_pow_of_two(size);
+
+	space = dma_alloc_coherent(dev, size, &phys_addr, GFP_KERNEL);
+	if (!space) {
+		dev_err(dev, "failed to allocate mem space\n");
+		return NULL;
+	}
+
+	epf->bar[bar].phys_addr = phys_addr;
+	epf->bar[bar].size = size;
+
+	return space;
+}
+EXPORT_SYMBOL_GPL(pci_epf_alloc_space);
+
+/**
+ * pci_epf_unregister_driver() - unregister the PCI EPF driver
+ * @driver: the PCI EPF driver that has to be unregistered
+ *
+ * Invoke to unregister the PCI EPF driver.
+ */
+void pci_epf_unregister_driver(struct pci_epf_driver *driver)
+{
+	driver_unregister(&driver->driver);
+}
+EXPORT_SYMBOL_GPL(pci_epf_unregister_driver);
+
+/**
+ * __pci_epf_register_driver() - register a new PCI EPF driver
+ * @driver: structure representing PCI EPF driver
+ * @owner: the owner of the module that registers the PCI EPF driver
+ *
+ * Invoke to register a new PCI EPF driver.
+ */
+int __pci_epf_register_driver(struct pci_epf_driver *driver,
+			      struct module *owner)
+{
+	int ret;
+
+	if (!driver->ops)
+		return -EINVAL;
+
+	if (!driver->ops->bind || !driver->ops->unbind || !driver->ops->linkup)
+		return -EINVAL;
+
+	driver->driver.bus = &pci_epf_bus_type;
+	driver->driver.owner = owner;
+
+	ret = driver_register(&driver->driver);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__pci_epf_register_driver);
+
+/**
+ * pci_epf_destroy() - destroy the created PCI EPF device
+ * @epf: the PCI EPF device that has to be destroyed.
+ *
+ * Invoke to destroy the PCI EPF device created by invoking pci_epf_create().
+ */
+void pci_epf_destroy(struct pci_epf *epf)
+{
+	device_unregister(&epf->dev);
+}
+EXPORT_SYMBOL_GPL(pci_epf_destroy);
+
+/**
+ * pci_epf_create() - create a new PCI EPF device
+ * @name: the name of the PCI EPF device. This name will be used to bind the
+ *	  the EPF device to a EPF driver
+ *
+ * Invoke to create a new PCI EPF device by providing the name of the function
+ * device.
+ */
+struct pci_epf *pci_epf_create(const char *name)
+{
+	int ret;
+	struct pci_epf *epf;
+	struct device *dev;
+	char *func_name;
+	char *buf;
+
+	epf = kzalloc(sizeof(*epf), GFP_KERNEL);
+	if (!epf) {
+		ret = -ENOMEM;
+		goto err_ret;
+	}
+
+	buf = kstrdup(name, GFP_KERNEL);
+	if (!buf) {
+		ret = -ENOMEM;
+		goto free_epf;
+	}
+
+	func_name = buf;
+	buf = strchrnul(buf, '.');
+	*buf = '\0';
+
+	epf->name = kstrdup(func_name, GFP_KERNEL);
+	if (!epf->name) {
+		ret = -ENOMEM;
+		goto free_func_name;
+	}
+
+	dev = &epf->dev;
+	device_initialize(dev);
+	dev->bus = &pci_epf_bus_type;
+	dev->type = &pci_epf_type;
+
+	ret = dev_set_name(dev, "%s", name);
+	if (ret)
+		goto put_dev;
+
+	ret = device_add(dev);
+	if (ret)
+		goto put_dev;
+
+	kfree(func_name);
+	return epf;
+
+put_dev:
+	put_device(dev);
+	kfree(epf->name);
+
+free_func_name:
+	kfree(func_name);
+
+free_epf:
+	kfree(epf);
+
+err_ret:
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(pci_epf_create);
+
+static void pci_epf_dev_release(struct device *dev)
+{
+	struct pci_epf *epf = to_pci_epf(dev);
+
+	kfree(epf->name);
+	kfree(epf);
+}
+
+static struct device_type pci_epf_type = {
+	.release	= pci_epf_dev_release,
+};
+
+static int
+pci_epf_match_id(const struct pci_epf_device_id *id, const struct pci_epf *epf)
+{
+	while (id->name[0]) {
+		if (strcmp(epf->name, id->name) == 0)
+			return true;
+		id++;
+	}
+
+	return false;
+}
+
+static int pci_epf_device_match(struct device *dev, struct device_driver *drv)
+{
+	struct pci_epf *epf = to_pci_epf(dev);
+	struct pci_epf_driver *driver = to_pci_epf_driver(drv);
+
+	if (driver->id_table)
+		return pci_epf_match_id(driver->id_table, epf);
+
+	return !strcmp(epf->name, drv->name);
+}
+
+static int pci_epf_device_probe(struct device *dev)
+{
+	struct pci_epf *epf = to_pci_epf(dev);
+	struct pci_epf_driver *driver = to_pci_epf_driver(dev->driver);
+
+	if (!driver->probe)
+		return -ENODEV;
+
+	epf->driver = driver;
+
+	return driver->probe(epf);
+}
+
+static int pci_epf_device_remove(struct device *dev)
+{
+	int ret;
+	struct pci_epf *epf = to_pci_epf(dev);
+	struct pci_epf_driver *driver = to_pci_epf_driver(dev->driver);
+
+	ret = driver->remove(epf);
+	epf->driver = NULL;
+
+	return ret;
+}
+
+static struct bus_type pci_epf_bus_type = {
+	.name		= "pci-epf",
+	.match		= pci_epf_device_match,
+	.probe		= pci_epf_device_probe,
+	.remove		= pci_epf_device_remove,
+};
+
+static int __init pci_epf_init(void)
+{
+	int ret;
+
+	ret = bus_register(&pci_epf_bus_type);
+	if (ret) {
+		pr_err("failed to register pci epf bus --> %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+module_init(pci_epf_init);
+
+static void __exit pci_epf_exit(void)
+{
+	bus_unregister(&pci_epf_bus_type);
+}
+module_exit(pci_epf_exit);
+
+MODULE_DESCRIPTION("PCI EPF Library");
+MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
+MODULE_LICENSE("GPL v2");

include/linux/mod_devicetable.h

@@ -428,6 +428,16 @@ struct i2c_device_id {
 	kernel_ulong_t driver_data;	/* Data private to the driver */
 };
 
+/* pci_epf */
+
+#define PCI_EPF_NAME_SIZE	20
+#define PCI_EPF_MODULE_PREFIX	"pci_epf:"
+
+struct pci_epf_device_id {
+	char name[PCI_EPF_NAME_SIZE];
+	kernel_ulong_t driver_data;
+};
+
 /* spi */
 
 #define SPI_NAME_SIZE	32

include/linux/pci-epc.h

+/**
+ * PCI Endpoint *Controller* (EPC) header file
+ *
+ * Copyright (C) 2017 Texas Instruments
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License as published by the Free Software Foundation.
+ */
+
+#ifndef __LINUX_PCI_EPC_H
+#define __LINUX_PCI_EPC_H
+
+#include <linux/pci-epf.h>
+
+struct pci_epc;
+
+enum pci_epc_irq_type {
+	PCI_EPC_IRQ_UNKNOWN,
+	PCI_EPC_IRQ_LEGACY,
+	PCI_EPC_IRQ_MSI,
+};
+
+/**
+ * struct pci_epc_ops - set of function pointers for performing EPC operations
+ * @write_header: ops to populate configuration space header
+ * @set_bar: ops to configure the BAR
+ * @clear_bar: ops to reset the BAR
+ * @map_addr: ops to map CPU address to PCI address
+ * @unmap_addr: ops to unmap CPU address and PCI address
+ * @set_msi: ops to set the requested number of MSI interrupts in the MSI
+ *	     capability register
+ * @get_msi: ops to get the number of MSI interrupts allocated by the RC from
+ *	     the MSI capability register
+ * @raise_irq: ops to raise a legacy or MSI interrupt
+ * @start: ops to start the PCI link
+ * @stop: ops to stop the PCI link
+ * @owner: the module owner containing the ops
+ */
+struct pci_epc_ops {
+	int	(*write_header)(struct pci_epc *pci_epc,
+				struct pci_epf_header *hdr);
+	int	(*set_bar)(struct pci_epc *epc, enum pci_barno bar,
+			   dma_addr_t bar_phys, size_t size, int flags);
+	void	(*clear_bar)(struct pci_epc *epc, enum pci_barno bar);
+	int	(*map_addr)(struct pci_epc *epc, phys_addr_t addr,
+			    u64 pci_addr, size_t size);
+	void	(*unmap_addr)(struct pci_epc *epc, phys_addr_t addr);
+	int	(*set_msi)(struct pci_epc *epc, u8 interrupts);
+	int	(*get_msi)(struct pci_epc *epc);
+	int	(*raise_irq)(struct pci_epc *pci_epc,
+			     enum pci_epc_irq_type type, u8 interrupt_num);
+	int	(*start)(struct pci_epc *epc);
+	void	(*stop)(struct pci_epc *epc);
+	struct module *owner;
+};
+
+/**
+ * struct pci_epc_mem - address space of the endpoint controller
+ * @phys_base: physical base address of the PCI address space
+ * @size: the size of the PCI address space
+ * @bitmap: bitmap to manage the PCI address space
+ * @pages: number of bits representing the address region
+ */
+struct pci_epc_mem {
+	phys_addr_t	phys_base;
+	size_t		size;
+	unsigned long	*bitmap;
+	int		pages;
+};
+
+/**
+ * struct pci_epc - represents the PCI EPC device
+ * @dev: PCI EPC device
+ * @pci_epf: list of endpoint functions present in this EPC device
+ * @ops: function pointers for performing endpoint operations
+ * @mem: address space of the endpoint controller
+ * @max_functions: max number of functions that can be configured in this EPC
+ * @lock: spinlock to protect pci_epc ops
+ */
+struct pci_epc {
+	struct device			dev;
+	struct list_head		pci_epf;
+	const struct pci_epc_ops	*ops;
+	struct pci_epc_mem		*mem;
+	u8				max_functions;
+	/* spinlock to protect against concurrent access of EP controller */
+	spinlock_t			lock;
+};
+
+#define to_pci_epc(device) container_of((device), struct pci_epc, dev)
+
+#define pci_epc_create(dev, ops)    \
+		__pci_epc_create((dev), (ops), THIS_MODULE)
+#define devm_pci_epc_create(dev, ops)    \
+		__devm_pci_epc_create((dev), (ops), THIS_MODULE)
+
+static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
+{
+	dev_set_drvdata(&epc->dev, data);
+}
+
+static inline void *epc_get_drvdata(struct pci_epc *epc)
+{
+	return dev_get_drvdata(&epc->dev);
+}
+
+struct pci_epc *
+__devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
+		      struct module *owner);
+struct pci_epc *
+__pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
+		 struct module *owner);
+void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc);
+void pci_epc_destroy(struct pci_epc *epc);
+int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf);
+void pci_epc_linkup(struct pci_epc *epc);
+void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf);
+int pci_epc_write_header(struct pci_epc *epc, struct pci_epf_header *hdr);
+int pci_epc_set_bar(struct pci_epc *epc, enum pci_barno bar,
+		    dma_addr_t bar_phys, size_t size, int flags);
+void pci_epc_clear_bar(struct pci_epc *epc, int bar);
+int pci_epc_map_addr(struct pci_epc *epc, phys_addr_t phys_addr,
+		     u64 pci_addr, size_t size);
+void pci_epc_unmap_addr(struct pci_epc *epc, phys_addr_t phys_addr);
+int pci_epc_set_msi(struct pci_epc *epc, u8 interrupts);
+int pci_epc_get_msi(struct pci_epc *epc);
+int pci_epc_raise_irq(struct pci_epc *epc, enum pci_epc_irq_type type,
+		      u8 interrupt_num);
+int pci_epc_start(struct pci_epc *epc);
+void pci_epc_stop(struct pci_epc *epc);
+struct pci_epc *pci_epc_get(const char *epc_name);
+void pci_epc_put(struct pci_epc *epc);
+
+int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_addr, size_t size);
+void pci_epc_mem_exit(struct pci_epc *epc);
+void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
+				     phys_addr_t *phys_addr, size_t size);
+void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
+			   void __iomem *virt_addr, size_t size);
+#endif /* __LINUX_PCI_EPC_H */

include/linux/pci-epf.h

+/**
+ * PCI Endpoint *Function* (EPF) header file
+ *
+ * Copyright (C) 2017 Texas Instruments
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License as published by the Free Software Foundation.
+ */
+
+#ifndef __LINUX_PCI_EPF_H
+#define __LINUX_PCI_EPF_H
+
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+
+struct pci_epf;
+
+enum pci_interrupt_pin {
+	PCI_INTERRUPT_UNKNOWN,
+	PCI_INTERRUPT_INTA,
+	PCI_INTERRUPT_INTB,
+	PCI_INTERRUPT_INTC,
+	PCI_INTERRUPT_INTD,
+};
+
+enum pci_barno {
+	BAR_0,
+	BAR_1,
+	BAR_2,
+	BAR_3,
+	BAR_4,
+	BAR_5,
+};
+
+/**
+ * struct pci_epf_header - represents standard configuration header
+ * @vendorid: identifies device manufacturer
+ * @deviceid: identifies a particular device
+ * @revid: specifies a device-specific revision identifier
+ * @progif_code: identifies a specific register-level programming interface
+ * @subclass_code: identifies more specifically the function of the device
+ * @baseclass_code: broadly classifies the type of function the device performs
+ * @cache_line_size: specifies the system cacheline size in units of DWORDs
+ * @subsys_vendor_id: vendor of the add-in card or subsystem
+ * @subsys_id: id specific to vendor
+ * @interrupt_pin: interrupt pin the device (or device function) uses
+ */
+struct pci_epf_header {
+	u16	vendorid;
+	u16	deviceid;
+	u8	revid;
+	u8	progif_code;
+	u8	subclass_code;
+	u8	baseclass_code;
+	u8	cache_line_size;
+	u16	subsys_vendor_id;
+	u16	subsys_id;
+	enum pci_interrupt_pin interrupt_pin;
+};
+
+/**
+ * struct pci_epf_ops - set of function pointers for performing EPF operations
+ * @bind: ops to perform when a EPC device has been bound to EPF device
+ * @unbind: ops to perform when a binding has been lost between a EPC device
+ *	    and EPF device
+ * @linkup: ops to perform when the EPC device has established a connection with
+ *	    a host system
+ */
+struct pci_epf_ops {
+	int	(*bind)(struct pci_epf *epf);
+	void	(*unbind)(struct pci_epf *epf);
+	void	(*linkup)(struct pci_epf *epf);
+};
+
+/**
+ * struct pci_epf_driver - represents the PCI EPF driver
+ * @probe: ops to perform when a new EPF device has been bound to the EPF driver
+ * @remove: ops to perform when the binding between the EPF device and EPF
+ *	    driver is broken
+ * @driver: PCI EPF driver
+ * @ops: set of function pointers for performing EPF operations
+ * @owner: the owner of the module that registers the PCI EPF driver
+ * @id_table: identifies EPF devices for probing
+ */
+struct pci_epf_driver {
+	int	(*probe)(struct pci_epf *epf);
+	int	(*remove)(struct pci_epf *epf);
+
+	struct device_driver	driver;
+	struct pci_epf_ops	*ops;
+	struct module		*owner;
+	const struct pci_epf_device_id	*id_table;
+};
+
+#define to_pci_epf_driver(drv) (container_of((drv), struct pci_epf_driver, \
+				driver))
+
+/**
+ * struct pci_epf_bar - represents the BAR of EPF device
+ * @phys_addr: physical address that should be mapped to the BAR
+ * @size: the size of the address space present in BAR
+ */
+struct pci_epf_bar {
+	dma_addr_t	phys_addr;
+	size_t		size;
+};
+
+/**
+ * struct pci_epf - represents the PCI EPF device
+ * @dev: the PCI EPF device
+ * @name: the name of the PCI EPF device
+ * @header: represents standard configuration header
+ * @bar: represents the BAR of EPF device
+ * @msi_interrupts: number of MSI interrupts required by this function
+ * @func_no: unique function number within this endpoint device
+ * @epc: the EPC device to which this EPF device is bound
+ * @driver: the EPF driver to which this EPF device is bound
+ * @list: to add pci_epf as a list of PCI endpoint functions to pci_epc
+ */
+struct pci_epf {
+	struct device		dev;
+	const char		*name;
+	struct pci_epf_header	*header;
+	struct pci_epf_bar	bar[6];
+	u8			msi_interrupts;
+	u8			func_no;
+
+	struct pci_epc		*epc;
+	struct pci_epf_driver	*driver;
+	struct list_head	list;
+};
+
+#define to_pci_epf(epf_dev) container_of((epf_dev), struct pci_epf, dev)
+
+#define pci_epf_register_driver(driver)    \
+		__pci_epf_register_driver((driver), THIS_MODULE)
+
+static inline void epf_set_drvdata(struct pci_epf *epf, void *data)
+{
+	dev_set_drvdata(&epf->dev, data);
+}
+
+static inline void *epf_get_drvdata(struct pci_epf *epf)
+{
+	return dev_get_drvdata(&epf->dev);
+}
+
+struct pci_epf *pci_epf_create(const char *name);
+void pci_epf_destroy(struct pci_epf *epf);
+int __pci_epf_register_driver(struct pci_epf_driver *driver,
+			      struct module *owner);
+void pci_epf_unregister_driver(struct pci_epf_driver *driver);
+void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar);
+void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar);
+int pci_epf_bind(struct pci_epf *epf);
+void pci_epf_unbind(struct pci_epf *epf);
+void pci_epf_linkup(struct pci_epf *epf);
+#endif /* __LINUX_PCI_EPF_H */