OSCL-LXR linux-6.0.1/​drivers/​pci/​endpoint/​pci-epc-core.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 /*
  * PCI Endpoint *Controller* (EPC) library
  *
  * Copyright (C) 2017 Texas Instruments
  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  */
 
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 
 #include <linux/pci-epc.h>
 #include <linux/pci-epf.h>
 #include <linux/pci-ep-cfs.h>
 
 static struct class *pci_epc_class;
 
 static void devm_pci_epc_release(struct device *dev, void *res)
 {
     struct pci_epc *epc = *(struct pci_epc **)res;
 
     pci_epc_destroy(epc);
 }
 
 static int devm_pci_epc_match(struct device *dev, void *res, void *match_data)
 {
     struct pci_epc **epc = res;
 
     return *epc == match_data;
 }
 
 /**
  * pci_epc_put() - release the PCI endpoint controller
  * @epc: epc returned by pci_epc_get()
  *
  * release the refcount the caller obtained by invoking pci_epc_get()
  */
 void pci_epc_put(struct pci_epc *epc)
 {
     if (!epc || IS_ERR(epc))
         return;
 
     module_put(epc->ops->owner);
     put_device(&epc->dev);
 }
 EXPORT_SYMBOL_GPL(pci_epc_put);
 
 /**
  * pci_epc_get() - get the PCI endpoint controller
  * @epc_name: device name of the endpoint controller
  *
  * Invoke to get struct pci_epc * corresponding to the device name of the
  * endpoint controller
  */
 struct pci_epc *pci_epc_get(const char *epc_name)
 {
     int ret = -EINVAL;
     struct pci_epc *epc;
     struct device *dev;
     struct class_dev_iter iter;
 
     class_dev_iter_init(&iter, pci_epc_class, NULL, NULL);
     while ((dev = class_dev_iter_next(&iter))) {
         if (strcmp(epc_name, dev_name(dev)))
             continue;
 
         epc = to_pci_epc(dev);
         if (!try_module_get(epc->ops->owner)) {
             ret = -EINVAL;
             goto err;
         }
 
         class_dev_iter_exit(&iter);
         get_device(&epc->dev);
         return epc;
     }
 
 err:
     class_dev_iter_exit(&iter);
     return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(pci_epc_get);
 
 /**
  * pci_epc_get_first_free_bar() - helper to get first unreserved BAR
  * @epc_features: pci_epc_features structure that holds the reserved bar bitmap
  *
  * Invoke to get the first unreserved BAR that can be used by the endpoint
  * function. For any incorrect value in reserved_bar return '0'.
  */
 enum pci_barno
 pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features)
 {
     return pci_epc_get_next_free_bar(epc_features, BAR_0);
 }
 EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar);
 
 /**
  * pci_epc_get_next_free_bar() - helper to get unreserved BAR starting from @bar
  * @epc_features: pci_epc_features structure that holds the reserved bar bitmap
  * @bar: the starting BAR number from where unreserved BAR should be searched
  *
  * Invoke to get the next unreserved BAR starting from @bar that can be used
  * for endpoint function. For any incorrect value in reserved_bar return '0'.
  */
 enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
                      *epc_features, enum pci_barno bar)
 {
     unsigned long free_bar;
 
     if (!epc_features)
         return BAR_0;
 
     /* If 'bar - 1' is a 64-bit BAR, move to the next BAR */
     if ((epc_features->bar_fixed_64bit << 1) & 1 << bar)
         bar++;
 
     /* Find if the reserved BAR is also a 64-bit BAR */
     free_bar = epc_features->reserved_bar & epc_features->bar_fixed_64bit;
 
     /* Set the adjacent bit if the reserved BAR is also a 64-bit BAR */
     free_bar <<= 1;
     free_bar |= epc_features->reserved_bar;
 
     free_bar = find_next_zero_bit(&free_bar, 6, bar);
     if (free_bar > 5)
         return NO_BAR;
 
     return free_bar;
 }
 EXPORT_SYMBOL_GPL(pci_epc_get_next_free_bar);
 
 /**
  * pci_epc_get_features() - get the features supported by EPC
  * @epc: the features supported by *this* EPC device will be returned
  * @func_no: the features supported by the EPC device specific to the
  *       endpoint function with func_no will be returned
  * @vfunc_no: the features supported by the EPC device specific to the
  *       virtual endpoint function with vfunc_no will be returned
  *
  * Invoke to get the features provided by the EPC which may be
  * specific to an endpoint function. Returns pci_epc_features on success
  * and NULL for any failures.
  */
 const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
                             u8 func_no, u8 vfunc_no)
 {
     const struct pci_epc_features *epc_features;
 
     if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
         return NULL;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return NULL;
 
     if (!epc->ops->get_features)
         return NULL;
 
     mutex_lock(&epc->lock);
     epc_features = epc->ops->get_features(epc, func_no, vfunc_no);
     mutex_unlock(&epc->lock);
 
     return epc_features;
 }
 EXPORT_SYMBOL_GPL(pci_epc_get_features);
 
 /**
  * pci_epc_stop() - stop the PCI link
  * @epc: the link of the EPC device that has to be stopped
  *
  * Invoke to stop the PCI link
  */
 void pci_epc_stop(struct pci_epc *epc)
 {
     if (IS_ERR(epc) || !epc->ops->stop)
         return;
 
     mutex_lock(&epc->lock);
     epc->ops->stop(epc);
     mutex_unlock(&epc->lock);
 }
 EXPORT_SYMBOL_GPL(pci_epc_stop);
 
 /**
  * pci_epc_start() - start the PCI link
  * @epc: the link of *this* EPC device has to be started
  *
  * Invoke to start the PCI link
  */
 int pci_epc_start(struct pci_epc *epc)
 {
     int ret;
 
     if (IS_ERR(epc))
         return -EINVAL;
 
     if (!epc->ops->start)
         return 0;
 
     mutex_lock(&epc->lock);
     ret = epc->ops->start(epc);
     mutex_unlock(&epc->lock);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(pci_epc_start);
 
 /**
  * pci_epc_raise_irq() - interrupt the host system
  * @epc: the EPC device which has to interrupt the host
  * @func_no: the physical endpoint function number in the EPC device
  * @vfunc_no: the virtual endpoint function number in the physical function
  * @type: specify the type of interrupt; legacy, MSI or MSI-X
  * @interrupt_num: the MSI or MSI-X interrupt number
  *
  * Invoke to raise an legacy, MSI or MSI-X interrupt
  */
 int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
               enum pci_epc_irq_type type, u16 interrupt_num)
 {
     int ret;
 
     if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
         return -EINVAL;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return -EINVAL;
 
     if (!epc->ops->raise_irq)
         return 0;
 
     mutex_lock(&epc->lock);
     ret = epc->ops->raise_irq(epc, func_no, vfunc_no, type, interrupt_num);
     mutex_unlock(&epc->lock);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(pci_epc_raise_irq);
 
 /**
  * pci_epc_map_msi_irq() - Map physical address to MSI address and return
  *                         MSI data
  * @epc: the EPC device which has the MSI capability
  * @func_no: the physical endpoint function number in the EPC device
  * @vfunc_no: the virtual endpoint function number in the physical function
  * @phys_addr: the physical address of the outbound region
  * @interrupt_num: the MSI interrupt number
  * @entry_size: Size of Outbound address region for each interrupt
  * @msi_data: the data that should be written in order to raise MSI interrupt
  *            with interrupt number as 'interrupt num'
  * @msi_addr_offset: Offset of MSI address from the aligned outbound address
  *                   to which the MSI address is mapped
  *
  * Invoke to map physical address to MSI address and return MSI data. The
  * physical address should be an address in the outbound region. This is
  * required to implement doorbell functionality of NTB wherein EPC on either
  * side of the interface (primary and secondary) can directly write to the
  * physical address (in outbound region) of the other interface to ring
  * doorbell.
  */
 int pci_epc_map_msi_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
             phys_addr_t phys_addr, u8 interrupt_num, u32 entry_size,
             u32 *msi_data, u32 *msi_addr_offset)
 {
     int ret;
 
     if (IS_ERR_OR_NULL(epc))
         return -EINVAL;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return -EINVAL;
 
     if (!epc->ops->map_msi_irq)
         return -EINVAL;
 
     mutex_lock(&epc->lock);
     ret = epc->ops->map_msi_irq(epc, func_no, vfunc_no, phys_addr,
                     interrupt_num, entry_size, msi_data,
                     msi_addr_offset);
     mutex_unlock(&epc->lock);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(pci_epc_map_msi_irq);
 
 /**
  * pci_epc_get_msi() - get the number of MSI interrupt numbers allocated
  * @epc: the EPC device to which MSI interrupts was requested
  * @func_no: the physical endpoint function number in the EPC device
  * @vfunc_no: the virtual endpoint function number in the physical function
  *
  * Invoke to get the number of MSI interrupts allocated by the RC
  */
 int pci_epc_get_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
 {
     int interrupt;
 
     if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
         return 0;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return 0;
 
     if (!epc->ops->get_msi)
         return 0;
 
     mutex_lock(&epc->lock);
     interrupt = epc->ops->get_msi(epc, func_no, vfunc_no);
     mutex_unlock(&epc->lock);
 
     if (interrupt < 0)
         return 0;
 
     interrupt = 1 << interrupt;
 
     return interrupt;
 }
 EXPORT_SYMBOL_GPL(pci_epc_get_msi);
 
 /**
  * pci_epc_set_msi() - set the number of MSI interrupt numbers required
  * @epc: the EPC device on which MSI has to be configured
  * @func_no: the physical endpoint function number in the EPC device
  * @vfunc_no: the virtual endpoint function number in the physical function
  * @interrupts: number of MSI interrupts required by the EPF
  *
  * Invoke to set the required number of MSI interrupts.
  */
 int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no, u8 interrupts)
 {
     int ret;
     u8 encode_int;
 
     if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
         interrupts < 1 || interrupts > 32)
         return -EINVAL;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return -EINVAL;
 
     if (!epc->ops->set_msi)
         return 0;
 
     encode_int = order_base_2(interrupts);
 
     mutex_lock(&epc->lock);
     ret = epc->ops->set_msi(epc, func_no, vfunc_no, encode_int);
     mutex_unlock(&epc->lock);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(pci_epc_set_msi);
 
 /**
  * pci_epc_get_msix() - get the number of MSI-X interrupt numbers allocated
  * @epc: the EPC device to which MSI-X interrupts was requested
  * @func_no: the physical endpoint function number in the EPC device
  * @vfunc_no: the virtual endpoint function number in the physical function
  *
  * Invoke to get the number of MSI-X interrupts allocated by the RC
  */
 int pci_epc_get_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
 {
     int interrupt;
 
     if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
         return 0;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return 0;
 
     if (!epc->ops->get_msix)
         return 0;
 
     mutex_lock(&epc->lock);
     interrupt = epc->ops->get_msix(epc, func_no, vfunc_no);
     mutex_unlock(&epc->lock);
 
     if (interrupt < 0)
         return 0;
 
     return interrupt + 1;
 }
 EXPORT_SYMBOL_GPL(pci_epc_get_msix);
 
 /**
  * pci_epc_set_msix() - set the number of MSI-X interrupt numbers required
  * @epc: the EPC device on which MSI-X has to be configured
  * @func_no: the physical endpoint function number in the EPC device
  * @vfunc_no: the virtual endpoint function number in the physical function
  * @interrupts: number of MSI-X interrupts required by the EPF
  * @bir: BAR where the MSI-X table resides
  * @offset: Offset pointing to the start of MSI-X table
  *
  * Invoke to set the required number of MSI-X interrupts.
  */
 int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
              u16 interrupts, enum pci_barno bir, u32 offset)
 {
     int ret;
 
     if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
         interrupts < 1 || interrupts > 2048)
         return -EINVAL;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return -EINVAL;
 
     if (!epc->ops->set_msix)
         return 0;
 
     mutex_lock(&epc->lock);
     ret = epc->ops->set_msix(epc, func_no, vfunc_no, interrupts - 1, bir,
                  offset);
     mutex_unlock(&epc->lock);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(pci_epc_set_msix);
 
 /**
  * pci_epc_unmap_addr() - unmap CPU address from PCI address
  * @epc: the EPC device on which address is allocated
  * @func_no: the physical endpoint function number in the EPC device
  * @vfunc_no: the virtual endpoint function number in the physical function
  * @phys_addr: physical address of the local system
  *
  * Invoke to unmap the CPU address from PCI address.
  */
 void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
             phys_addr_t phys_addr)
 {
     if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
         return;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return;
 
     if (!epc->ops->unmap_addr)
         return;
 
     mutex_lock(&epc->lock);
     epc->ops->unmap_addr(epc, func_no, vfunc_no, phys_addr);
     mutex_unlock(&epc->lock);
 }
 EXPORT_SYMBOL_GPL(pci_epc_unmap_addr);
 
 /**
  * pci_epc_map_addr() - map CPU address to PCI address
  * @epc: the EPC device on which address is allocated
  * @func_no: the physical endpoint function number in the EPC device
  * @vfunc_no: the virtual endpoint function number in the physical function
  * @phys_addr: physical address of the local system
  * @pci_addr: PCI address to which the physical address should be mapped
  * @size: the size of the allocation
  *
  * Invoke to map CPU address with PCI address.
  */
 int pci_epc_map_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
              phys_addr_t phys_addr, u64 pci_addr, size_t size)
 {
     int ret;
 
     if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
         return -EINVAL;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return -EINVAL;
 
     if (!epc->ops->map_addr)
         return 0;
 
     mutex_lock(&epc->lock);
     ret = epc->ops->map_addr(epc, func_no, vfunc_no, phys_addr, pci_addr,
                  size);
     mutex_unlock(&epc->lock);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(pci_epc_map_addr);
 
 /**
  * pci_epc_clear_bar() - reset the BAR
  * @epc: the EPC device for which the BAR has to be cleared
  * @func_no: the physical endpoint function number in the EPC device
  * @vfunc_no: the virtual endpoint function number in the physical function
  * @epf_bar: the struct epf_bar that contains the BAR information
  *
  * Invoke to reset the BAR of the endpoint device.
  */
 void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
                struct pci_epf_bar *epf_bar)
 {
     if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
         (epf_bar->barno == BAR_5 &&
          epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64))
         return;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return;
 
     if (!epc->ops->clear_bar)
         return;
 
     mutex_lock(&epc->lock);
     epc->ops->clear_bar(epc, func_no, vfunc_no, epf_bar);
     mutex_unlock(&epc->lock);
 }
 EXPORT_SYMBOL_GPL(pci_epc_clear_bar);
 
 /**
  * pci_epc_set_bar() - configure BAR in order for host to assign PCI addr space
  * @epc: the EPC device on which BAR has to be configured
  * @func_no: the physical endpoint function number in the EPC device
  * @vfunc_no: the virtual endpoint function number in the physical function
  * @epf_bar: the struct epf_bar that contains the BAR information
  *
  * Invoke to configure the BAR of the endpoint device.
  */
 int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
             struct pci_epf_bar *epf_bar)
 {
     int ret;
     int flags = epf_bar->flags;
 
     if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
         (epf_bar->barno == BAR_5 &&
          flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ||
         (flags & PCI_BASE_ADDRESS_SPACE_IO &&
          flags & PCI_BASE_ADDRESS_IO_MASK) ||
         (upper_32_bits(epf_bar->size) &&
          !(flags & PCI_BASE_ADDRESS_MEM_TYPE_64)))
         return -EINVAL;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return -EINVAL;
 
     if (!epc->ops->set_bar)
         return 0;
 
     mutex_lock(&epc->lock);
     ret = epc->ops->set_bar(epc, func_no, vfunc_no, epf_bar);
     mutex_unlock(&epc->lock);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(pci_epc_set_bar);
 
 /**
  * pci_epc_write_header() - write standard configuration header
  * @epc: the EPC device to which the configuration header should be written
  * @func_no: the physical endpoint function number in the EPC device
  * @vfunc_no: the virtual endpoint function number in the physical function
  * @header: standard configuration header fields
  *
  * Invoke to write the configuration header to the endpoint controller. Every
  * endpoint controller will have a dedicated location to which the standard
  * configuration header would be written. The callback function should write
  * the header fields to this dedicated location.
  */
 int pci_epc_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
              struct pci_epf_header *header)
 {
     int ret;
 
     if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
         return -EINVAL;
 
     if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
         return -EINVAL;
 
     /* Only Virtual Function #1 has deviceID */
     if (vfunc_no > 1)
         return -EINVAL;
 
     if (!epc->ops->write_header)
         return 0;
 
     mutex_lock(&epc->lock);
     ret = epc->ops->write_header(epc, func_no, vfunc_no, header);
     mutex_unlock(&epc->lock);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(pci_epc_write_header);
 
 /**
  * pci_epc_add_epf() - bind PCI endpoint function to an endpoint controller
  * @epc: the EPC device to which the endpoint function should be added
  * @epf: the endpoint function to be added
  * @type: Identifies if the EPC is connected to the primary or secondary
  *        interface of EPF
  *
  * A PCI endpoint device can have one or more functions. In the case of PCIe,
  * the specification allows up to 8 PCIe endpoint functions. Invoke
  * pci_epc_add_epf() to add a PCI endpoint function to an endpoint controller.
  */
 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf,
             enum pci_epc_interface_type type)
 {
     struct list_head *list;
     u32 func_no;
     int ret = 0;
 
     if (IS_ERR_OR_NULL(epc) || epf->is_vf)
         return -EINVAL;
 
     if (type == PRIMARY_INTERFACE && epf->epc)
         return -EBUSY;
 
     if (type == SECONDARY_INTERFACE && epf->sec_epc)
         return -EBUSY;
 
     mutex_lock(&epc->lock);
     func_no = find_first_zero_bit(&epc->function_num_map,
                       BITS_PER_LONG);
     if (func_no >= BITS_PER_LONG) {
         ret = -EINVAL;
         goto ret;
     }
 
     if (func_no > epc->max_functions - 1) {
         dev_err(&epc->dev, "Exceeding max supported Function Number\n");
         ret = -EINVAL;
         goto ret;
     }
 
     set_bit(func_no, &epc->function_num_map);
     if (type == PRIMARY_INTERFACE) {
         epf->func_no = func_no;
         epf->epc = epc;
         list = &epf->list;
     } else {
         epf->sec_epc_func_no = func_no;
         epf->sec_epc = epc;
         list = &epf->sec_epc_list;
     }
 
     list_add_tail(list, &epc->pci_epf);
 ret:
     mutex_unlock(&epc->lock);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(pci_epc_add_epf);
 
 /**
  * pci_epc_remove_epf() - remove PCI endpoint function from endpoint controller
  * @epc: the EPC device from which the endpoint function should be removed
  * @epf: the endpoint function to be removed
  * @type: identifies if the EPC is connected to the primary or secondary
  *        interface of EPF
  *
  * Invoke to remove PCI endpoint function from the endpoint controller.
  */
 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
             enum pci_epc_interface_type type)
 {
     struct list_head *list;
     u32 func_no = 0;
 
     if (!epc || IS_ERR(epc) || !epf)
         return;
 
     if (type == PRIMARY_INTERFACE) {
         func_no = epf->func_no;
         list = &epf->list;
     } else {
         func_no = epf->sec_epc_func_no;
         list = &epf->sec_epc_list;
     }
 
     mutex_lock(&epc->lock);
     clear_bit(func_no, &epc->function_num_map);
     list_del(list);
     epf->epc = NULL;
     mutex_unlock(&epc->lock);
 }
 EXPORT_SYMBOL_GPL(pci_epc_remove_epf);
 
 /**
  * pci_epc_linkup() - Notify the EPF device that EPC device has established a
  *            connection with the Root Complex.
  * @epc: the EPC device which has established link with the host
  *
  * Invoke to Notify the EPF device that the EPC device has established a
  * connection with the Root Complex.
  */
 void pci_epc_linkup(struct pci_epc *epc)
 {
     if (!epc || IS_ERR(epc))
         return;
 
     atomic_notifier_call_chain(&epc->notifier, LINK_UP, NULL);
 }
 EXPORT_SYMBOL_GPL(pci_epc_linkup);
 
 /**
  * pci_epc_init_notify() - Notify the EPF device that EPC device's core
  *             initialization is completed.
  * @epc: the EPC device whose core initialization is completed
  *
  * Invoke to Notify the EPF device that the EPC device's initialization
  * is completed.
  */
 void pci_epc_init_notify(struct pci_epc *epc)
 {
     if (!epc || IS_ERR(epc))
         return;
 
     atomic_notifier_call_chain(&epc->notifier, CORE_INIT, NULL);
 }
 EXPORT_SYMBOL_GPL(pci_epc_init_notify);
 
 /**
  * pci_epc_destroy() - destroy the EPC device
  * @epc: the EPC device that has to be destroyed
  *
  * Invoke to destroy the PCI EPC device
  */
 void pci_epc_destroy(struct pci_epc *epc)
 {
     pci_ep_cfs_remove_epc_group(epc->group);
     device_unregister(&epc->dev);
     kfree(epc);
 }
 EXPORT_SYMBOL_GPL(pci_epc_destroy);
 
 /**
  * devm_pci_epc_destroy() - destroy the EPC device
  * @dev: device that wants to destroy the EPC
  * @epc: the EPC device that has to be destroyed
  *
  * Invoke to destroy the devres associated with this
  * pci_epc and destroy the EPC device.
  */
 void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc)
 {
     int r;
 
     r = devres_destroy(dev, devm_pci_epc_release, devm_pci_epc_match,
                epc);
     dev_WARN_ONCE(dev, r, "couldn't find PCI EPC resource\n");
 }
 EXPORT_SYMBOL_GPL(devm_pci_epc_destroy);
 
 /**
  * __pci_epc_create() - create a new endpoint controller (EPC) device
  * @dev: device that is creating the new EPC
  * @ops: function pointers for performing EPC operations
  * @owner: the owner of the module that creates the EPC device
  *
  * Invoke to create a new EPC device and add it to pci_epc class.
  */
 struct pci_epc *
 __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
          struct module *owner)
 {
     int ret;
     struct pci_epc *epc;
 
     if (WARN_ON(!dev)) {
         ret = -EINVAL;
         goto err_ret;
     }
 
     epc = kzalloc(sizeof(*epc), GFP_KERNEL);
     if (!epc) {
         ret = -ENOMEM;
         goto err_ret;
     }
 
     mutex_init(&epc->lock);
     INIT_LIST_HEAD(&epc->pci_epf);
     ATOMIC_INIT_NOTIFIER_HEAD(&epc->notifier);
 
     device_initialize(&epc->dev);
     epc->dev.class = pci_epc_class;
     epc->dev.parent = dev;
     epc->ops = ops;
 
     ret = dev_set_name(&epc->dev, "%s", dev_name(dev));
     if (ret)
         goto put_dev;
 
     ret = device_add(&epc->dev);
     if (ret)
         goto put_dev;
 
     epc->group = pci_ep_cfs_add_epc_group(dev_name(dev));
 
     return epc;
 
 put_dev:
     put_device(&epc->dev);
     kfree(epc);
 
 err_ret:
     return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(__pci_epc_create);
 
 /**
  * __devm_pci_epc_create() - create a new endpoint controller (EPC) device
  * @dev: device that is creating the new EPC
  * @ops: function pointers for performing EPC operations
  * @owner: the owner of the module that creates the EPC device
  *
  * Invoke to create a new EPC device and add it to pci_epc class.
  * While at that, it also associates the device with the pci_epc using devres.
  * On driver detach, release function is invoked on the devres data,
  * then, devres data is freed.
  */
 struct pci_epc *
 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
               struct module *owner)
 {
     struct pci_epc **ptr, *epc;
 
     ptr = devres_alloc(devm_pci_epc_release, sizeof(*ptr), GFP_KERNEL);
     if (!ptr)
         return ERR_PTR(-ENOMEM);
 
     epc = __pci_epc_create(dev, ops, owner);
     if (!IS_ERR(epc)) {
         *ptr = epc;
         devres_add(dev, ptr);
     } else {
         devres_free(ptr);
     }
 
     return epc;
 }
 EXPORT_SYMBOL_GPL(__devm_pci_epc_create);
 
 static int __init pci_epc_init(void)
 {
     pci_epc_class = class_create(THIS_MODULE, "pci_epc");
     if (IS_ERR(pci_epc_class)) {
         pr_err("failed to create pci epc class --> %ld\n",
                PTR_ERR(pci_epc_class));
         return PTR_ERR(pci_epc_class);
     }
 
     return 0;
 }
 module_init(pci_epc_init);
 
 static void __exit pci_epc_exit(void)
 {
     class_destroy(pci_epc_class);
 }
 module_exit(pci_epc_exit);
 
 MODULE_DESCRIPTION("PCI EPC Library");
 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
 MODULE_LICENSE("GPL v2");

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