LXR linux/drivers/dma/ioat/pci.c

   1/*
   2 * Intel I/OAT DMA Linux driver
   3 * Copyright(c) 2007 - 2009 Intel Corporation.
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms and conditions of the GNU General Public License,
   7 * version 2, as published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 * more details.
  13 *
  14 * You should have received a copy of the GNU General Public License along with
  15 * this program; if not, write to the Free Software Foundation, Inc.,
  16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17 *
  18 * The full GNU General Public License is included in this distribution in
  19 * the file called "COPYING".
  20 *
  21 */
  22
  23/*
  24 * This driver supports an Intel I/OAT DMA engine, which does asynchronous
  25 * copy operations.
  26 */
  27
  28#include <linux/init.h>
  29#include <linux/module.h>
  30#include <linux/pci.h>
  31#include <linux/interrupt.h>
  32#include <linux/dca.h>
  33#include <linux/slab.h>
  34#include "dma.h"
  35#include "dma_v2.h"
  36#include "registers.h"
  37#include "hw.h"
  38
  39MODULE_VERSION(IOAT_DMA_VERSION);
  40MODULE_LICENSE("Dual BSD/GPL");
  41MODULE_AUTHOR("Intel Corporation");
  42
  43static struct pci_device_id ioat_pci_tbl[] = {
  44        /* I/OAT v1 platforms */
  45        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
  46        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB)  },
  47        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
  48        { PCI_VDEVICE(UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
  49
  50        /* I/OAT v2 platforms */
  51        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
  52
  53        /* I/OAT v3 platforms */
  54        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
  55        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
  56        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
  57        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
  58        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
  59        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
  60        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
  61        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
  62
  63        /* I/OAT v3.2 platforms */
  64        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
  65        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
  66        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
  67        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
  68        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
  69        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
  70        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
  71        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
  72        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
  73        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },
  74
  75        { 0, }
  76};
  77MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
  78
  79static int __devinit ioat_pci_probe(struct pci_dev *pdev,
  80                                    const struct pci_device_id *id);
  81static void __devexit ioat_remove(struct pci_dev *pdev);
  82
  83static int ioat_dca_enabled = 1;
  84module_param(ioat_dca_enabled, int, 0644);
  85MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
  86
  87struct kmem_cache *ioat2_cache;
  88
  89#define DRV_NAME "ioatdma"
  90
  91static struct pci_driver ioat_pci_driver = {
  92        .name           = DRV_NAME,
  93        .id_table       = ioat_pci_tbl,
  94        .probe          = ioat_pci_probe,
  95        .remove         = __devexit_p(ioat_remove),
  96};
  97
  98static struct ioatdma_device *
  99alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
 100{
 101        struct device *dev = &pdev->dev;
 102        struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
 103
 104        if (!d)
 105                return NULL;
 106        d->pdev = pdev;
 107        d->reg_base = iobase;
 108        return d;
 109}
 110
 111static int __devinit ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 112{
 113        void __iomem * const *iomap;
 114        struct device *dev = &pdev->dev;
 115        struct ioatdma_device *device;
 116        int err;
 117
 118        err = pcim_enable_device(pdev);
 119        if (err)
 120                return err;
 121
 122        err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
 123        if (err)
 124                return err;
 125        iomap = pcim_iomap_table(pdev);
 126        if (!iomap)
 127                return -ENOMEM;
 128
 129        err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 130        if (err)
 131                err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 132        if (err)
 133                return err;
 134
 135        err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
 136        if (err)
 137                err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 138        if (err)
 139                return err;
 140
 141        device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
 142        if (!device)
 143                return -ENOMEM;
 144        pci_set_master(pdev);
 145        pci_set_drvdata(pdev, device);
 146
 147        device->version = readb(device->reg_base + IOAT_VER_OFFSET);
 148        if (device->version == IOAT_VER_1_2)
 149                err = ioat1_dma_probe(device, ioat_dca_enabled);
 150        else if (device->version == IOAT_VER_2_0)
 151                err = ioat2_dma_probe(device, ioat_dca_enabled);
 152        else if (device->version >= IOAT_VER_3_0)
 153                err = ioat3_dma_probe(device, ioat_dca_enabled);
 154        else
 155                return -ENODEV;
 156
 157        if (err) {
 158                dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
 159                return -ENODEV;
 160        }
 161
 162        return 0;
 163}
 164
 165static void __devexit ioat_remove(struct pci_dev *pdev)
 166{
 167        struct ioatdma_device *device = pci_get_drvdata(pdev);
 168
 169        if (!device)
 170                return;
 171
 172        dev_err(&pdev->dev, "Removing dma and dca services\n");
 173        if (device->dca) {
 174                unregister_dca_provider(device->dca, &pdev->dev);
 175                free_dca_provider(device->dca);
 176                device->dca = NULL;
 177        }
 178        ioat_dma_remove(device);
 179}
 180
 181static int __init ioat_init_module(void)
 182{
 183        int err;
 184
 185        pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
 186                DRV_NAME, IOAT_DMA_VERSION);
 187
 188        ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
 189                                        0, SLAB_HWCACHE_ALIGN, NULL);
 190        if (!ioat2_cache)
 191                return -ENOMEM;
 192
 193        err = pci_register_driver(&ioat_pci_driver);
 194        if (err)
 195                kmem_cache_destroy(ioat2_cache);
 196
 197        return err;
 198}
 199module_init(ioat_init_module);
 200
 201static void __exit ioat_exit_module(void)
 202{
 203        pci_unregister_driver(&ioat_pci_driver);
 204        kmem_cache_destroy(ioat2_cache);
 205}
 206module_exit(ioat_exit_module);
 207