Hi Kishon, Às 9:50 AM de 2/17/2017, Kishon Vijay Abraham I escreveu: > Introduce a new EP core layer in order to support endpoint functions > in linux kernel. This comprises of EPC library > (Endpoint Controller Library) and EPF library (Endpoint > Function Library). EPC library implements functions that is specific > to an endpoint controller and EPF library implements functions > that is specific to an endpoint function. > > Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx> > --- > drivers/Makefile | 2 + > drivers/pci/Kconfig | 1 + > drivers/pci/endpoint/Kconfig | 21 ++ > drivers/pci/endpoint/Makefile | 6 + > drivers/pci/endpoint/pci-epc-core.c | 548 +++++++++++++++++++++++++++++++++++ > drivers/pci/endpoint/pci-epc-mem.c | 143 +++++++++ > drivers/pci/endpoint/pci-epf-core.c | 347 ++++++++++++++++++++++ > include/linux/mod_devicetable.h | 10 + > include/linux/pci-epc.h | 141 +++++++++ > include/linux/pci-epf.h | 160 ++++++++++ > 10 files changed, 1379 insertions(+) > create mode 100644 drivers/pci/endpoint/Kconfig > create mode 100644 drivers/pci/endpoint/Makefile > create mode 100644 drivers/pci/endpoint/pci-epc-core.c > create mode 100644 drivers/pci/endpoint/pci-epc-mem.c > create mode 100644 drivers/pci/endpoint/pci-epf-core.c > create mode 100644 include/linux/pci-epc.h > create mode 100644 include/linux/pci-epf.h > > diff --git a/drivers/Makefile b/drivers/Makefile > index f521cb0..a300bb1 100644 > --- a/drivers/Makefile > +++ b/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-$(CONFIG_PCI_ENDPOINT) += pci/endpoint/ > # PCI dwc controller drivers > obj-y += pci/dwc/ Any special reason to include pci/endpoint and pci/dwc in drivers/Makefile instead of being inside pci/Makefile? pci/host is still inside pci/Makefile. > > diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig > index df14142..9747c1e 100644 > --- a/drivers/pci/Kconfig > +++ b/drivers/pci/Kconfig > @@ -134,3 +134,4 @@ config PCI_HYPERV > source "drivers/pci/hotplug/Kconfig" > source "drivers/pci/dwc/Kconfig" > source "drivers/pci/host/Kconfig" > +source "drivers/pci/endpoint/Kconfig" > diff --git a/drivers/pci/endpoint/Kconfig b/drivers/pci/endpoint/Kconfig > new file mode 100644 > index 0000000..7eb1c79 > --- /dev/null > +++ b/drivers/pci/endpoint/Kconfig > @@ -0,0 +1,21 @@ > +# > +# PCI Endpoint Support > +# > + > +menu "PCI Endpoint" > + > +config PCI_ENDPOINT > + bool "PCI Endpoint Support" > + select CONFIGFS_FS > + help > + Enable this configuration option to support configurable PCI > + endpoint. This should be enabled if the platform has a PCI > + controller that can operate in endpoint mode. > + > + Enabling this option will build the endpoint library, which > + includes endpoint controller library and endpoint function > + library. > + > + If in doubt, say "N" to disable Endpoint support. > + > +endmenu > diff --git a/drivers/pci/endpoint/Makefile b/drivers/pci/endpoint/Makefile > new file mode 100644 > index 0000000..dc1bc16 > --- /dev/null > +++ b/drivers/pci/endpoint/Makefile > @@ -0,0 +1,6 @@ > +# > +# Makefile for PCI Endpoint Support > +# > + > +obj-$(CONFIG_PCI_ENDPOINT) += pci-epc-core.o pci-epf-core.o\ > + pci-epc-mem.o > diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c > new file mode 100644 > index 0000000..2c33e8a > --- /dev/null > +++ b/drivers/pci/endpoint/pci-epc-core.c > @@ -0,0 +1,548 @@ > +/** > + * PCI Endpoint *Controller* (EPC) library > + * > + * Copyright (C) 2017 Texas Instruments > + * Author: Kishon Vijay Abraham I <kishon@xxxxxx> > + * > + * 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 <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.gnu.org_licenses_&d=DwIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=s2fO0hii0OGNOv9qQy_HRXy-xAJUD1NNoEcc3io_kx0&m=swFEoYaziG2Fdcvbq0MAtOjv2PLxgqEMssA9yjQVqXI&s=ibUotwnXH20Q3a_vRJYtFUvGbSQN_43xAmUcsQ4FNvo&e= >. > + */ > + > +#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 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_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(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; > + } > + > + get_device(&epc->dev); > + return epc; > + } > + > +err: > + class_dev_iter_exit(&iter); > + return ERR_PTR(ret); > +} > +EXPORT_SYMBOL_GPL(pci_epc_get); > + > +/** > + * 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_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) > +{ > + unsigned long flags; > + > + if (IS_ERR(epc) || !epc->ops->stop) > + return; > + > + spin_lock_irqsave(&epc->lock, flags); > + epc->ops->stop(epc); > + spin_unlock_irqrestore(&epc->lock, flags); > +} > +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; > + unsigned long flags; > + > + if (IS_ERR(epc)) > + return -EINVAL; > + > + if (!epc->ops->start) > + return 0; > + > + spin_lock_irqsave(&epc->lock, flags); > + ret = epc->ops->start(epc); > + spin_unlock_irqrestore(&epc->lock, flags); > + > + 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 > + * @type: specify the type of interrupt; legacy or MSI > + * @interrupt_num: the MSI interrupt number > + * > + * Invoke to raise an MSI or legacy interrupt > + */ > +int pci_epc_raise_irq(struct pci_epc *epc, enum pci_epc_irq_type type, > + u8 interrupt_num) > +{ > + int ret; > + unsigned long flags; > + > + if (IS_ERR(epc)) > + return -EINVAL; > + > + if (!epc->ops->raise_irq) > + return 0; > + > + spin_lock_irqsave(&epc->lock, flags); > + ret = epc->ops->raise_irq(epc, type, interrupt_num); > + spin_unlock_irqrestore(&epc->lock, flags); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(pci_epc_raise_irq); > + > +/** > + * pci_epc_get_msi() - get the number of MSI interrupt numbers allocated > + * @epc: the EPC device to which MSI interrupts was requested > + * > + * Invoke to get the number of MSI interrupts allocated by the RC > + */ > +int pci_epc_get_msi(struct pci_epc *epc) > +{ > + int interrupt; > + unsigned long flags; > + > + if (IS_ERR(epc)) > + return 0; > + > + if (!epc->ops->get_msi) > + return 0; > + > + spin_lock_irqsave(&epc->lock, flags); > + interrupt = epc->ops->get_msi(epc); > + spin_unlock_irqrestore(&epc->lock, flags); > + > + 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 > + * @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 interrupts) > +{ > + int ret; > + u8 encode_int; > + unsigned long flags; > + > + if (IS_ERR(epc)) > + return -EINVAL; > + > + if (!epc->ops->set_msi) > + return 0; > + > + encode_int = order_base_2(interrupts); > + > + spin_lock_irqsave(&epc->lock, flags); > + ret = epc->ops->set_msi(epc, encode_int); > + spin_unlock_irqrestore(&epc->lock, flags); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(pci_epc_set_msi); > + > +/** > + * pci_epc_unmap_addr() - unmap cpu address from pci address > + * @epc: the EPC device on which address is allocated > + * @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, phys_addr_t phys_addr) > +{ > + unsigned long flags; > + > + if (IS_ERR(epc)) > + return; > + > + if (!epc->ops->unmap_addr) > + return; > + > + spin_lock_irqsave(&epc->lock, flags); > + epc->ops->unmap_addr(epc, phys_addr); > + spin_unlock_irqrestore(&epc->lock, flags); > +} > +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 > + * @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, phys_addr_t phys_addr, > + u64 pci_addr, size_t size) > +{ > + int ret; > + unsigned long flags; > + > + if (IS_ERR(epc)) > + return -EINVAL; > + > + if (!epc->ops->map_addr) > + return 0; > + > + spin_lock_irqsave(&epc->lock, flags); > + ret = epc->ops->map_addr(epc, phys_addr, pci_addr, size); > + spin_unlock_irqrestore(&epc->lock, flags); > + > + 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 > + * @bar: the bar number that has to be reset > + * > + * Invoke to reset the BAR of the endpoint device. > + */ > +void pci_epc_clear_bar(struct pci_epc *epc, int bar) > +{ > + unsigned long flags; > + > + if (IS_ERR(epc)) > + return; > + > + if (!epc->ops->clear_bar) > + return; > + > + spin_lock_irqsave(&epc->lock, flags); > + epc->ops->clear_bar(epc, bar); > + spin_unlock_irqrestore(&epc->lock, flags); > +} > +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 > + * @bar: the bar number that has to be configured > + * @size: the size of the addr space > + * @flags: specify memory allocation/io allocation/32bit address/64 bit address > + * > + * Invoke to configure the BAR of the endpoint device. > + */ > +int pci_epc_set_bar(struct pci_epc *epc, enum pci_barno bar, > + dma_addr_t bar_phys, size_t size, int flags) > +{ > + int ret; > + unsigned long irq_flags; > + > + if (IS_ERR(epc)) > + return -EINVAL; > + > + if (!epc->ops->set_bar) > + return 0; > + > + spin_lock_irqsave(&epc->lock, irq_flags); > + ret = epc->ops->set_bar(epc, bar, bar_phys, size, flags); > + spin_unlock_irqrestore(&epc->lock, irq_flags); > + > + 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 > + * @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, struct pci_epf_header *header) > +{ > + int ret; > + unsigned long flags; > + > + if (IS_ERR(epc)) > + return -EINVAL; > + > + if (!epc->ops->write_header) > + return 0; > + > + spin_lock_irqsave(&epc->lock, flags); > + ret = epc->ops->write_header(epc, header); > + spin_unlock_irqrestore(&epc->lock, flags); > + > + 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 > + * > + * A PCI endpoint device can have one or more functions. In the case of PCIe, > + * the specification allows upto 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) > +{ > + unsigned long flags; > + > + if (IS_ERR(epc)) > + return -EINVAL; > + > + if (epf->func_no > epc->max_functions - 1) > + return -EINVAL; > + > + dma_set_coherent_mask(&epf->dev, epc->dev.coherent_dma_mask); > + epf->dev.dma_mask = epc->dev.dma_mask; > + > + spin_lock_irqsave(&epc->lock, flags); > + list_add_tail(&epf->list, &epc->pci_epf); > + spin_unlock_irqrestore(&epc->lock, flags); > + > + return 0; > +} > +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 > + * > + * Invoke to remove pci endpoint function from the endpoint controller. > + */ > +void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf) > +{ > + unsigned long flags; > + > + if (!epc || IS_ERR(epc)) > + return; > + > + spin_lock_irqsave(&epc->lock, flags); > + list_del(&epf->list); > + spin_unlock_irqrestore(&epc->lock, flags); > +} > +EXPORT_SYMBOL_GPL(pci_epc_remove_epf); > + > +/** > + * 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) > +{ > + 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; > + } > + > + spin_lock_init(&epc->lock); > + INIT_LIST_HEAD(&epc->pci_epf); > + > + device_initialize(&epc->dev); > + dma_set_coherent_mask(&epc->dev, dev->coherent_dma_mask); > + epc->dev.class = pci_epc_class; > + epc->dev.dma_mask = dev->dma_mask; > + 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; > + > + 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@xxxxxx>"); > +MODULE_LICENSE("GPL v2"); > diff --git a/drivers/pci/endpoint/pci-epc-mem.c b/drivers/pci/endpoint/pci-epc-mem.c > new file mode 100644 > index 0000000..3a94cc1 > --- /dev/null > +++ b/drivers/pci/endpoint/pci-epc-mem.c > @@ -0,0 +1,143 @@ > +/** > + * PCI Endpoint *Controller* Address Space Management > + * > + * Copyright (C) 2017 Texas Instruments > + * Author: Kishon Vijay Abraham I <kishon@xxxxxx> > + * > + * 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 <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.gnu.org_licenses_&d=DwIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=s2fO0hii0OGNOv9qQy_HRXy-xAJUD1NNoEcc3io_kx0&m=swFEoYaziG2Fdcvbq0MAtOjv2PLxgqEMssA9yjQVqXI&s=ibUotwnXH20Q3a_vRJYtFUvGbSQN_43xAmUcsQ4FNvo&e= >. > + */ > + > +#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@xxxxxx>"); > +MODULE_LICENSE("GPL v2"); > diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c > new file mode 100644 > index 0000000..4c903fc > --- /dev/null > +++ b/drivers/pci/endpoint/pci-epf-core.c > @@ -0,0 +1,347 @@ > +/** > + * PCI Endpoint *Function* (EPF) library > + * > + * Copyright (C) 2017 Texas Instruments > + * Author: Kishon Vijay Abraham I <kishon@xxxxxx> > + * > + * 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 <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.gnu.org_licenses_&d=DwIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=s2fO0hii0OGNOv9qQy_HRXy-xAJUD1NNoEcc3io_kx0&m=swFEoYaziG2Fdcvbq0MAtOjv2PLxgqEMssA9yjQVqXI&s=ibUotwnXH20Q3a_vRJYtFUvGbSQN_43xAmUcsQ4FNvo&e= >. > + */ > + > +#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"); > + > + 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"); > + > + 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"); > + > + 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_epf; > + } > + > + 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); > + 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@xxxxxx>"); > +MODULE_LICENSE("GPL v2"); > diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h > index 8a57f0b..bf706c1 100644 > --- a/include/linux/mod_devicetable.h > +++ b/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 > diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h > new file mode 100644 > index 0000000..b62f39d > --- /dev/null > +++ b/include/linux/pci-epc.h > @@ -0,0 +1,141 @@ > +/** > + * PCI Endpoint *Controller* (EPC) header file > + * > + * Copyright (C) 2017 Texas Instruments > + * Author: Kishon Vijay Abraham I <kishon@xxxxxx> > + * > + * 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_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(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 */ > diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h > new file mode 100644 > index 0000000..54f1338 > --- /dev/null > +++ b/include/linux/pci-epf.h > @@ -0,0 +1,160 @@ > +/** > + * PCI Endpoint *Function* (EPF) header file > + * > + * Copyright (C) 2017 Texas Instruments > + * Author: Kishon Vijay Abraham I <kishon@xxxxxx> > + * > + * 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 */ >
