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 "dma.h"
  34 #include "dma_v2.h"
  35 #include "registers.h"
  36 #include "hw.h"
  37
  38 MODULE_VERSION(IOAT_DMA_VERSION);
  39 MODULE_LICENSE("Dual BSD/GPL");
  40 MODULE_AUTHOR("Intel Corporation");
  41
  42 static struct pci_device_id ioat_pci_tbl[] = {
  43         /* I/OAT v1 platforms */
  44         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
  45         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB)  },
  46         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
  47         { PCI_VDEVICE(UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
  48
  49         /* I/OAT v2 platforms */
  50         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
  51
  52         /* I/OAT v3 platforms */
  53         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
  54         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
  55         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
  56         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
  57         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
  58         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
  59         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
  60         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
  61
  62         /* I/OAT v3.2 platforms */
  63         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
  64         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
  65         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
  66         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
  67         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
  68         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
  69         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
  70         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
  71         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
  72         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },
  73
  74         { 0, }
  75 };
  76 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
  77
  78 static int __devinit ioat_pci_probe(struct pci_dev *pdev,
  79                                     const struct pci_device_id *id);
  80 static void __devexit ioat_remove(struct pci_dev *pdev);
  81
  82 static int ioat_dca_enabled = 1;
  83 module_param(ioat_dca_enabled, int, 0644);
  84 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
  85
  86 struct kmem_cache *ioat2_cache;
  87
  88 #define DRV_NAME "ioatdma"
  89
  90 static struct pci_driver ioat_pci_driver = {
  91         .name           = DRV_NAME,
  92         .id_table       = ioat_pci_tbl,
  93         .probe          = ioat_pci_probe,
  94         .remove         = __devexit_p(ioat_remove),
  95 };
  96
  97 static struct ioatdma_device *
  98 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
  99 {
 100         struct device *dev = &pdev->dev;
 101         struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
 102
 103         if (!d)
 104                 return NULL;
 105         d->pdev = pdev;
 106         d->reg_base = iobase;
 107         return d;
 108 }
 109
 110 static int __devinit ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 111 {
 112         void __iomem * const *iomap;
 113         struct device *dev = &pdev->dev;
 114         struct ioatdma_device *device;
 115         int err;
 116
 117         err = pcim_enable_device(pdev);
 118         if (err)
 119                 return err;
 120
 121         err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
 122         if (err)
 123                 return err;
 124         iomap = pcim_iomap_table(pdev);
 125         if (!iomap)
 126                 return -ENOMEM;
 127
 128         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 129         if (err)
 130                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 131         if (err)
 132                 return err;
 133
 134         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
 135         if (err)
 136                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 137         if (err)
 138                 return err;
 139
 140         device = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL);
 141         if (!device)
 142                 return -ENOMEM;
 143
 144         pci_set_master(pdev);
 145
 146         device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
 147         if (!device)
 148                 return -ENOMEM;
 149         pci_set_drvdata(pdev, device);
 150
 151         device->version = readb(device->reg_base + IOAT_VER_OFFSET);
 152         if (device->version == IOAT_VER_1_2)
 153                 err = ioat1_dma_probe(device, ioat_dca_enabled);
 154         else if (device->version == IOAT_VER_2_0)
 155                 err = ioat2_dma_probe(device, ioat_dca_enabled);
 156         else if (device->version >= IOAT_VER_3_0)
 157                 err = ioat3_dma_probe(device, ioat_dca_enabled);
 158         else
 159                 return -ENODEV;
 160
 161         if (err) {
 162                 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
 163                 return -ENODEV;
 164         }
 165
 166         return 0;
 167 }
 168
 169 static void __devexit ioat_remove(struct pci_dev *pdev)
 170 {
 171         struct ioatdma_device *device = pci_get_drvdata(pdev);
 172
 173         if (!device)
 174                 return;
 175
 176         dev_err(&pdev->dev, "Removing dma and dca services\n");
 177         if (device->dca) {
 178                 unregister_dca_provider(device->dca, &pdev->dev);
 179                 free_dca_provider(device->dca);
 180                 device->dca = NULL;
 181         }
 182         ioat_dma_remove(device);
 183 }
 184
 185 static int __init ioat_init_module(void)
 186 {
 187         int err;
 188
 189         pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
 190                 DRV_NAME, IOAT_DMA_VERSION);
 191
 192         ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
 193                                         0, SLAB_HWCACHE_ALIGN, NULL);
 194         if (!ioat2_cache)
 195                 return -ENOMEM;
 196
 197         err = pci_register_driver(&ioat_pci_driver);
 198         if (err)
 199                 kmem_cache_destroy(ioat2_cache);
 200
 201         return err;
 202 }
 203 module_init(ioat_init_module);
 204
 205 static void __exit ioat_exit_module(void)
 206 {
 207         pci_unregister_driver(&ioat_pci_driver);
 208         kmem_cache_destroy(ioat2_cache);
 209 }
 210 module_exit(ioat_exit_module);