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ioat.c

/*
 * 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[] = {
      /* I/OAT v1 platforms */
      { 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) },

      /* I/OAT v2 platforms */
      { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
      { 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;
      case IOAT_VER_2_0:
            device->dma = ioat_dma_probe(pdev, iobase);
            if (device->dma && ioat_dca_enabled)
                  device->dca = ioat2_dca_init(pdev, iobase);
            break;
      default:
            err = -ENODEV;
            break;
      }
      if (!device->dma)
            err = -ENODEV;
      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);

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