linux/drivers/dma/ioat/pci.c
<<
>>
Prefs
   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        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
  76        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
  77        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
  78        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
  79        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
  80        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
  81        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
  82        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
  83        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
  84        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },
  85
  86        { 0, }
  87};
  88MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
  89
  90static int __devinit ioat_pci_probe(struct pci_dev *pdev,
  91                                    const struct pci_device_id *id);
  92static void __devexit ioat_remove(struct pci_dev *pdev);
  93
  94static int ioat_dca_enabled = 1;
  95module_param(ioat_dca_enabled, int, 0644);
  96MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
  97
  98struct kmem_cache *ioat2_cache;
  99
 100#define DRV_NAME "ioatdma"
 101
 102static struct pci_driver ioat_pci_driver = {
 103        .name           = DRV_NAME,
 104        .id_table       = ioat_pci_tbl,
 105        .probe          = ioat_pci_probe,
 106        .remove         = __devexit_p(ioat_remove),
 107};
 108
 109static struct ioatdma_device *
 110alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
 111{
 112        struct device *dev = &pdev->dev;
 113        struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
 114
 115        if (!d)
 116                return NULL;
 117        d->pdev = pdev;
 118        d->reg_base = iobase;
 119        return d;
 120}
 121
 122static int __devinit ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 123{
 124        void __iomem * const *iomap;
 125        struct device *dev = &pdev->dev;
 126        struct ioatdma_device *device;
 127        int err;
 128
 129        err = pcim_enable_device(pdev);
 130        if (err)
 131                return err;
 132
 133        err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
 134        if (err)
 135                return err;
 136        iomap = pcim_iomap_table(pdev);
 137        if (!iomap)
 138                return -ENOMEM;
 139
 140        err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 141        if (err)
 142                err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 143        if (err)
 144                return err;
 145
 146        err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
 147        if (err)
 148                err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 149        if (err)
 150                return err;
 151
 152        device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
 153        if (!device)
 154                return -ENOMEM;
 155        pci_set_master(pdev);
 156        pci_set_drvdata(pdev, device);
 157
 158        device->version = readb(device->reg_base + IOAT_VER_OFFSET);
 159        if (device->version == IOAT_VER_1_2)
 160                err = ioat1_dma_probe(device, ioat_dca_enabled);
 161        else if (device->version == IOAT_VER_2_0)
 162                err = ioat2_dma_probe(device, ioat_dca_enabled);
 163        else if (device->version >= IOAT_VER_3_0)
 164                err = ioat3_dma_probe(device, ioat_dca_enabled);
 165        else
 166                return -ENODEV;
 167
 168        if (err) {
 169                dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
 170                return -ENODEV;
 171        }
 172
 173        return 0;
 174}
 175
 176static void __devexit ioat_remove(struct pci_dev *pdev)
 177{
 178        struct ioatdma_device *device = pci_get_drvdata(pdev);
 179
 180        if (!device)
 181                return;
 182
 183        dev_err(&pdev->dev, "Removing dma and dca services\n");
 184        if (device->dca) {
 185                unregister_dca_provider(device->dca, &pdev->dev);
 186                free_dca_provider(device->dca);
 187                device->dca = NULL;
 188        }
 189        ioat_dma_remove(device);
 190}
 191
 192static int __init ioat_init_module(void)
 193{
 194        int err;
 195
 196        pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
 197                DRV_NAME, IOAT_DMA_VERSION);
 198
 199        ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
 200                                        0, SLAB_HWCACHE_ALIGN, NULL);
 201        if (!ioat2_cache)
 202                return -ENOMEM;
 203
 204        err = pci_register_driver(&ioat_pci_driver);
 205        if (err)
 206                kmem_cache_destroy(ioat2_cache);
 207
 208        return err;
 209}
 210module_init(ioat_init_module);
 211
 212static void __exit ioat_exit_module(void)
 213{
 214        pci_unregister_driver(&ioat_pci_driver);
 215        kmem_cache_destroy(ioat2_cache);
 216}
 217module_exit(ioat_exit_module);
 218