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         { 0, }
  76 };
  77 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
  78
  79 static int __devinit ioat_pci_probe(struct pci_dev *pdev,
  80                                     const struct pci_device_id *id);
  81 static void __devexit ioat_remove(struct pci_dev *pdev);
  82
  83 static int ioat_dca_enabled = 1;
  84 module_param(ioat_dca_enabled, int, 0644);
  85 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
  86
  87 struct kmem_cache *ioat2_cache;
  88
  89 #define DRV_NAME "ioatdma"
  90
  91 static 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
  98 static struct ioatdma_device *
  99 alloc_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
 111 static 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 = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL);
 142         if (!device)
 143                 return -ENOMEM;
 144
 145         pci_set_master(pdev);
 146
 147         device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
 148         if (!device)
 149                 return -ENOMEM;
 150         pci_set_drvdata(pdev, device);
 151
 152         device->version = readb(device->reg_base + IOAT_VER_OFFSET);
 153         if (device->version == IOAT_VER_1_2)
 154                 err = ioat1_dma_probe(device, ioat_dca_enabled);
 155         else if (device->version == IOAT_VER_2_0)
 156                 err = ioat2_dma_probe(device, ioat_dca_enabled);
 157         else if (device->version >= IOAT_VER_3_0)
 158                 err = ioat3_dma_probe(device, ioat_dca_enabled);
 159         else
 160                 return -ENODEV;
 161
 162         if (err) {
 163                 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
 164                 return -ENODEV;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static void __devexit ioat_remove(struct pci_dev *pdev)
 171 {
 172         struct ioatdma_device *device = pci_get_drvdata(pdev);
 173
 174         if (!device)
 175                 return;
 176
 177         dev_err(&pdev->dev, "Removing dma and dca services\n");
 178         if (device->dca) {
 179                 unregister_dca_provider(device->dca, &pdev->dev);
 180                 free_dca_provider(device->dca);
 181                 device->dca = NULL;
 182         }
 183         ioat_dma_remove(device);
 184 }
 185
 186 static int __init ioat_init_module(void)
 187 {
 188         int err;
 189
 190         pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
 191                 DRV_NAME, IOAT_DMA_VERSION);
 192
 193         ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
 194                                         0, SLAB_HWCACHE_ALIGN, NULL);
 195         if (!ioat2_cache)
 196                 return -ENOMEM;
 197
 198         err = pci_register_driver(&ioat_pci_driver);
 199         if (err)
 200                 kmem_cache_destroy(ioat2_cache);
 201
 202         return err;
 203 }
 204 module_init(ioat_init_module);
 205
 206 static void __exit ioat_exit_module(void)
 207 {
 208         pci_unregister_driver(&ioat_pci_driver);
 209         kmem_cache_destroy(ioat2_cache);
 210 }
 211 module_exit(ioat_exit_module);