/* * Intel I/OAT DMA Linux driver * Copyright(c) 2007 Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, 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, write to the Free Software Foundation, Inc., * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. * * The full GNU General Public License is included in this distribution in * the file called "COPYING". * */ /* * This driver supports an Intel I/OAT DMA engine, which does asynchronous * copy operations. */ #include <linux/init.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/interrupt.h> #include <linux/dca.h> #include "ioatdma.h" #include "ioatdma_registers.h" #include "ioatdma_hw.h" MODULE_VERSION(IOAT_DMA_VERSION); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Intel Corporation"); static struct pci_device_id ioat_pci_tbl[] = { { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) }, { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) }, { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) }, { PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) }, { 0, } }; struct ioat_device { struct pci_dev *pdev; void __iomem *iobase; struct ioatdma_device *dma; struct dca_provider *dca; }; static int __devinit ioat_probe(struct pci_dev *pdev, const struct pci_device_id *id); static void __devexit ioat_remove(struct pci_dev *pdev); static int ioat_dca_enabled = 1; module_param(ioat_dca_enabled, int, 0644); MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)"); static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase) { struct ioat_device *device = pci_get_drvdata(pdev); u8 version; int err = 0; version = readb(iobase + IOAT_VER_OFFSET); switch (version) { case IOAT_VER_1_2: device->dma = ioat_dma_probe(pdev, iobase); if (device->dma && ioat_dca_enabled) device->dca = ioat_dca_init(pdev, iobase); break; default: err = -ENODEV; break; } return err; } static void ioat_shutdown_functionality(struct pci_dev *pdev) { struct ioat_device *device = pci_get_drvdata(pdev); dev_err(&pdev->dev, "Removing dma and dca services\n"); if (device->dca) { unregister_dca_provider(device->dca); free_dca_provider(device->dca); device->dca = NULL; } if (device->dma) { ioat_dma_remove(device->dma); device->dma = NULL; } } static struct pci_driver ioat_pci_driver = { .name = "ioatdma", .id_table = ioat_pci_tbl, .probe = ioat_probe, .shutdown = ioat_shutdown_functionality, .remove = __devexit_p(ioat_remove), }; static int __devinit ioat_probe(struct pci_dev *pdev, const struct pci_device_id *id) { void __iomem *iobase; struct ioat_device *device; unsigned long mmio_start, mmio_len; int err; err = pci_enable_device(pdev); if (err) goto err_enable_device; err = pci_request_regions(pdev, ioat_pci_driver.name); if (err) goto err_request_regions; err = pci_set_dma_mask(pdev, DMA_64BIT_MASK); if (err) err = pci_set_dma_mask(pdev, DMA_32BIT_MASK); if (err) goto err_set_dma_mask; err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK); if (err) err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK); if (err) goto err_set_dma_mask; mmio_start = pci_resource_start(pdev, 0); mmio_len = pci_resource_len(pdev, 0); iobase = ioremap(mmio_start, mmio_len); if (!iobase) { err = -ENOMEM; goto err_ioremap; } device = kzalloc(sizeof(*device), GFP_KERNEL); if (!device) { err = -ENOMEM; goto err_kzalloc; } device->pdev = pdev; pci_set_drvdata(pdev, device); device->iobase = iobase; pci_set_master(pdev); err = ioat_setup_functionality(pdev, iobase); if (err) goto err_version; return 0; err_version: kfree(device); err_kzalloc: iounmap(iobase); err_ioremap: err_set_dma_mask: pci_release_regions(pdev); pci_disable_device(pdev); err_request_regions: err_enable_device: return err; } /* * It is unsafe to remove this module: if removed while a requested * dma is outstanding, esp. from tcp, it is possible to hang while * waiting for something that will never finish. However, if you're * feeling lucky, this usually works just fine. */ static void __devexit ioat_remove(struct pci_dev *pdev) { struct ioat_device *device = pci_get_drvdata(pdev); ioat_shutdown_functionality(pdev); kfree(device); } static int __init ioat_init_module(void) { return pci_register_driver(&ioat_pci_driver); } module_init(ioat_init_module); static void __exit ioat_exit_module(void) { pci_unregister_driver(&ioat_pci_driver); } module_exit(ioat_exit_module);