![Kishon Vijay Abraham I](/assets/img/avatar_default.png)
Use of_dma_configure() to set the initial DMA mask of EPF device. This helps to get rid of "Coherent DMA mask 0x0 (pfn 0x0-0x1) covers a smaller range of system memory than the DMA zone pfn" warning in certain platforms like TI's K2G resulting in coherent DMA mask not being set. Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
588 lines
14 KiB
C
588 lines
14 KiB
C
/**
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* PCI Endpoint *Controller* (EPC) library
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*
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* Copyright (C) 2017 Texas Instruments
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* Author: Kishon Vijay Abraham I <kishon@ti.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 of
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* the License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/pci-epc.h>
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#include <linux/pci-epf.h>
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#include <linux/pci-ep-cfs.h>
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static struct class *pci_epc_class;
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static void devm_pci_epc_release(struct device *dev, void *res)
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{
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struct pci_epc *epc = *(struct pci_epc **)res;
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pci_epc_destroy(epc);
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}
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static int devm_pci_epc_match(struct device *dev, void *res, void *match_data)
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{
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struct pci_epc **epc = res;
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return *epc == match_data;
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}
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/**
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* pci_epc_put() - release the PCI endpoint controller
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* @epc: epc returned by pci_epc_get()
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*
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* release the refcount the caller obtained by invoking pci_epc_get()
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*/
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void pci_epc_put(struct pci_epc *epc)
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{
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if (!epc || IS_ERR(epc))
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return;
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module_put(epc->ops->owner);
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put_device(&epc->dev);
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}
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EXPORT_SYMBOL_GPL(pci_epc_put);
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/**
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* pci_epc_get() - get the PCI endpoint controller
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* @epc_name: device name of the endpoint controller
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*
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* Invoke to get struct pci_epc * corresponding to the device name of the
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* endpoint controller
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*/
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struct pci_epc *pci_epc_get(const char *epc_name)
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{
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int ret = -EINVAL;
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struct pci_epc *epc;
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struct device *dev;
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struct class_dev_iter iter;
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class_dev_iter_init(&iter, pci_epc_class, NULL, NULL);
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while ((dev = class_dev_iter_next(&iter))) {
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if (strcmp(epc_name, dev_name(dev)))
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continue;
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epc = to_pci_epc(dev);
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if (!try_module_get(epc->ops->owner)) {
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ret = -EINVAL;
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goto err;
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}
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class_dev_iter_exit(&iter);
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get_device(&epc->dev);
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return epc;
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}
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err:
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class_dev_iter_exit(&iter);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(pci_epc_get);
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/**
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* pci_epc_stop() - stop the PCI link
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* @epc: the link of the EPC device that has to be stopped
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*
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* Invoke to stop the PCI link
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*/
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void pci_epc_stop(struct pci_epc *epc)
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{
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unsigned long flags;
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if (IS_ERR(epc) || !epc->ops->stop)
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return;
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spin_lock_irqsave(&epc->lock, flags);
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epc->ops->stop(epc);
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spin_unlock_irqrestore(&epc->lock, flags);
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}
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EXPORT_SYMBOL_GPL(pci_epc_stop);
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/**
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* pci_epc_start() - start the PCI link
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* @epc: the link of *this* EPC device has to be started
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*
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* Invoke to start the PCI link
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*/
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int pci_epc_start(struct pci_epc *epc)
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{
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int ret;
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unsigned long flags;
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if (IS_ERR(epc))
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return -EINVAL;
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if (!epc->ops->start)
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return 0;
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spin_lock_irqsave(&epc->lock, flags);
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ret = epc->ops->start(epc);
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spin_unlock_irqrestore(&epc->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pci_epc_start);
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/**
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* pci_epc_raise_irq() - interrupt the host system
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* @epc: the EPC device which has to interrupt the host
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* @type: specify the type of interrupt; legacy or MSI
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* @interrupt_num: the MSI interrupt number
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*
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* Invoke to raise an MSI or legacy interrupt
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*/
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int pci_epc_raise_irq(struct pci_epc *epc, enum pci_epc_irq_type type,
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u8 interrupt_num)
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{
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int ret;
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unsigned long flags;
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if (IS_ERR(epc))
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return -EINVAL;
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if (!epc->ops->raise_irq)
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return 0;
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spin_lock_irqsave(&epc->lock, flags);
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ret = epc->ops->raise_irq(epc, type, interrupt_num);
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spin_unlock_irqrestore(&epc->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pci_epc_raise_irq);
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/**
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* pci_epc_get_msi() - get the number of MSI interrupt numbers allocated
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* @epc: the EPC device to which MSI interrupts was requested
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*
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* Invoke to get the number of MSI interrupts allocated by the RC
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*/
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int pci_epc_get_msi(struct pci_epc *epc)
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{
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int interrupt;
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unsigned long flags;
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if (IS_ERR(epc))
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return 0;
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if (!epc->ops->get_msi)
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return 0;
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spin_lock_irqsave(&epc->lock, flags);
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interrupt = epc->ops->get_msi(epc);
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spin_unlock_irqrestore(&epc->lock, flags);
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if (interrupt < 0)
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return 0;
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interrupt = 1 << interrupt;
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return interrupt;
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}
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EXPORT_SYMBOL_GPL(pci_epc_get_msi);
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/**
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* pci_epc_set_msi() - set the number of MSI interrupt numbers required
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* @epc: the EPC device on which MSI has to be configured
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* @interrupts: number of MSI interrupts required by the EPF
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*
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* Invoke to set the required number of MSI interrupts.
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*/
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int pci_epc_set_msi(struct pci_epc *epc, u8 interrupts)
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{
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int ret;
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u8 encode_int;
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unsigned long flags;
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if (IS_ERR(epc))
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return -EINVAL;
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if (!epc->ops->set_msi)
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return 0;
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encode_int = order_base_2(interrupts);
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spin_lock_irqsave(&epc->lock, flags);
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ret = epc->ops->set_msi(epc, encode_int);
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spin_unlock_irqrestore(&epc->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pci_epc_set_msi);
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/**
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* pci_epc_unmap_addr() - unmap CPU address from PCI address
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* @epc: the EPC device on which address is allocated
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* @phys_addr: physical address of the local system
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*
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* Invoke to unmap the CPU address from PCI address.
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*/
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void pci_epc_unmap_addr(struct pci_epc *epc, phys_addr_t phys_addr)
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{
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unsigned long flags;
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if (IS_ERR(epc))
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return;
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if (!epc->ops->unmap_addr)
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return;
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spin_lock_irqsave(&epc->lock, flags);
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epc->ops->unmap_addr(epc, phys_addr);
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spin_unlock_irqrestore(&epc->lock, flags);
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}
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EXPORT_SYMBOL_GPL(pci_epc_unmap_addr);
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/**
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* pci_epc_map_addr() - map CPU address to PCI address
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* @epc: the EPC device on which address is allocated
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* @phys_addr: physical address of the local system
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* @pci_addr: PCI address to which the physical address should be mapped
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* @size: the size of the allocation
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*
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* Invoke to map CPU address with PCI address.
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*/
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int pci_epc_map_addr(struct pci_epc *epc, phys_addr_t phys_addr,
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u64 pci_addr, size_t size)
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{
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int ret;
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unsigned long flags;
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if (IS_ERR(epc))
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return -EINVAL;
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if (!epc->ops->map_addr)
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return 0;
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spin_lock_irqsave(&epc->lock, flags);
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ret = epc->ops->map_addr(epc, phys_addr, pci_addr, size);
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spin_unlock_irqrestore(&epc->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pci_epc_map_addr);
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/**
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* pci_epc_clear_bar() - reset the BAR
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* @epc: the EPC device for which the BAR has to be cleared
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* @bar: the BAR number that has to be reset
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*
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* Invoke to reset the BAR of the endpoint device.
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*/
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void pci_epc_clear_bar(struct pci_epc *epc, int bar)
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{
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unsigned long flags;
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if (IS_ERR(epc))
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return;
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if (!epc->ops->clear_bar)
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return;
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spin_lock_irqsave(&epc->lock, flags);
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epc->ops->clear_bar(epc, bar);
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spin_unlock_irqrestore(&epc->lock, flags);
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}
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EXPORT_SYMBOL_GPL(pci_epc_clear_bar);
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/**
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* pci_epc_set_bar() - configure BAR in order for host to assign PCI addr space
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* @epc: the EPC device on which BAR has to be configured
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* @bar: the BAR number that has to be configured
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* @size: the size of the addr space
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* @flags: specify memory allocation/io allocation/32bit address/64 bit address
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*
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* Invoke to configure the BAR of the endpoint device.
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*/
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int pci_epc_set_bar(struct pci_epc *epc, enum pci_barno bar,
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dma_addr_t bar_phys, size_t size, int flags)
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{
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int ret;
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unsigned long irq_flags;
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if (IS_ERR(epc))
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return -EINVAL;
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if (!epc->ops->set_bar)
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return 0;
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spin_lock_irqsave(&epc->lock, irq_flags);
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ret = epc->ops->set_bar(epc, bar, bar_phys, size, flags);
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spin_unlock_irqrestore(&epc->lock, irq_flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pci_epc_set_bar);
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/**
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* pci_epc_write_header() - write standard configuration header
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* @epc: the EPC device to which the configuration header should be written
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* @header: standard configuration header fields
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*
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* Invoke to write the configuration header to the endpoint controller. Every
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* endpoint controller will have a dedicated location to which the standard
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* configuration header would be written. The callback function should write
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* the header fields to this dedicated location.
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*/
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int pci_epc_write_header(struct pci_epc *epc, struct pci_epf_header *header)
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{
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int ret;
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unsigned long flags;
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if (IS_ERR(epc))
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return -EINVAL;
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if (!epc->ops->write_header)
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return 0;
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spin_lock_irqsave(&epc->lock, flags);
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ret = epc->ops->write_header(epc, header);
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spin_unlock_irqrestore(&epc->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pci_epc_write_header);
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/**
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* pci_epc_add_epf() - bind PCI endpoint function to an endpoint controller
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* @epc: the EPC device to which the endpoint function should be added
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* @epf: the endpoint function to be added
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*
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* A PCI endpoint device can have one or more functions. In the case of PCIe,
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* the specification allows up to 8 PCIe endpoint functions. Invoke
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* pci_epc_add_epf() to add a PCI endpoint function to an endpoint controller.
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*/
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int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf)
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{
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unsigned long flags;
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struct device *dev = epc->dev.parent;
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if (epf->epc)
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return -EBUSY;
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if (IS_ERR(epc))
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return -EINVAL;
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if (epf->func_no > epc->max_functions - 1)
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return -EINVAL;
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epf->epc = epc;
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if (dev->of_node) {
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of_dma_configure(&epf->dev, dev->of_node);
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} else {
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dma_set_coherent_mask(&epf->dev, epc->dev.coherent_dma_mask);
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epf->dev.dma_mask = epc->dev.dma_mask;
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}
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spin_lock_irqsave(&epc->lock, flags);
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list_add_tail(&epf->list, &epc->pci_epf);
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spin_unlock_irqrestore(&epc->lock, flags);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pci_epc_add_epf);
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/**
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* pci_epc_remove_epf() - remove PCI endpoint function from endpoint controller
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* @epc: the EPC device from which the endpoint function should be removed
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* @epf: the endpoint function to be removed
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*
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* Invoke to remove PCI endpoint function from the endpoint controller.
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*/
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void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf)
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{
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unsigned long flags;
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if (!epc || IS_ERR(epc))
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return;
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spin_lock_irqsave(&epc->lock, flags);
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list_del(&epf->list);
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spin_unlock_irqrestore(&epc->lock, flags);
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}
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EXPORT_SYMBOL_GPL(pci_epc_remove_epf);
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/**
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* pci_epc_linkup() - Notify the EPF device that EPC device has established a
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* connection with the Root Complex.
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* @epc: the EPC device which has established link with the host
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*
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* Invoke to Notify the EPF device that the EPC device has established a
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* connection with the Root Complex.
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*/
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void pci_epc_linkup(struct pci_epc *epc)
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{
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unsigned long flags;
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struct pci_epf *epf;
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if (!epc || IS_ERR(epc))
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return;
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spin_lock_irqsave(&epc->lock, flags);
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list_for_each_entry(epf, &epc->pci_epf, list)
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pci_epf_linkup(epf);
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spin_unlock_irqrestore(&epc->lock, flags);
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}
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EXPORT_SYMBOL_GPL(pci_epc_linkup);
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/**
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* pci_epc_destroy() - destroy the EPC device
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* @epc: the EPC device that has to be destroyed
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*
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* Invoke to destroy the PCI EPC device
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*/
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void pci_epc_destroy(struct pci_epc *epc)
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{
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pci_ep_cfs_remove_epc_group(epc->group);
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device_unregister(&epc->dev);
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kfree(epc);
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}
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EXPORT_SYMBOL_GPL(pci_epc_destroy);
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/**
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* devm_pci_epc_destroy() - destroy the EPC device
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* @dev: device that wants to destroy the EPC
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* @epc: the EPC device that has to be destroyed
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*
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* Invoke to destroy the devres associated with this
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* pci_epc and destroy the EPC device.
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*/
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void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc)
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{
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int r;
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r = devres_destroy(dev, devm_pci_epc_release, devm_pci_epc_match,
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epc);
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dev_WARN_ONCE(dev, r, "couldn't find PCI EPC resource\n");
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}
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EXPORT_SYMBOL_GPL(devm_pci_epc_destroy);
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/**
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* __pci_epc_create() - create a new endpoint controller (EPC) device
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* @dev: device that is creating the new EPC
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* @ops: function pointers for performing EPC operations
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* @owner: the owner of the module that creates the EPC device
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*
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* Invoke to create a new EPC device and add it to pci_epc class.
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*/
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struct pci_epc *
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__pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
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struct module *owner)
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{
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int ret;
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struct pci_epc *epc;
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if (WARN_ON(!dev)) {
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ret = -EINVAL;
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goto err_ret;
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}
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epc = kzalloc(sizeof(*epc), GFP_KERNEL);
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if (!epc) {
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ret = -ENOMEM;
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goto err_ret;
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}
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spin_lock_init(&epc->lock);
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INIT_LIST_HEAD(&epc->pci_epf);
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device_initialize(&epc->dev);
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dma_set_coherent_mask(&epc->dev, dev->coherent_dma_mask);
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epc->dev.class = pci_epc_class;
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epc->dev.dma_mask = dev->dma_mask;
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epc->dev.parent = dev;
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epc->ops = ops;
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ret = dev_set_name(&epc->dev, "%s", dev_name(dev));
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if (ret)
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goto put_dev;
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ret = device_add(&epc->dev);
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|
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");
|