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
  39 MODULE_VERSION(IOAT_DMA_VERSION);
  40 MODULE_LICENSE("Dual BSD/GPL");
  41 MODULE_AUTHOR("Intel Corporation");
  42
  43 static 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 };
  88 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
  89
  90 static int __devinit ioat_pci_probe(struct pci_dev *pdev,
  91                                     const struct pci_device_id *id);
  92 static void __devexit ioat_remove(struct pci_dev *pdev);
  93
  94 static int ioat_dca_enabled = 1;
  95 module_param(ioat_dca_enabled, int, 0644);
  96 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
  97
  98 struct kmem_cache *ioat2_cache;
  99
 100 #define DRV_NAME "ioatdma"
 101
 102 static 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
 109 static struct ioatdma_device *
 110 alloc_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
 122 static 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
 176 static 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
 192 static 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 }
 210 module_init(ioat_init_module);
 211
 212 static void __exit ioat_exit_module(void)
 213 {
 214         pci_unregister_driver(&ioat_pci_driver);
 215         kmem_cache_destroy(ioat2_cache);
 216 }
 217 module_exit(ioat_exit_module);