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 #define PCI_DEVICE_ID_INTEL_IOAT_IVB0   0x0e20
  44 #define PCI_DEVICE_ID_INTEL_IOAT_IVB1   0x0e21
  45 #define PCI_DEVICE_ID_INTEL_IOAT_IVB2   0x0e22
  46 #define PCI_DEVICE_ID_INTEL_IOAT_IVB3   0x0e23
  47 #define PCI_DEVICE_ID_INTEL_IOAT_IVB4   0x0e24
  48 #define PCI_DEVICE_ID_INTEL_IOAT_IVB5   0x0e25
  49 #define PCI_DEVICE_ID_INTEL_IOAT_IVB6   0x0e26
  50 #define PCI_DEVICE_ID_INTEL_IOAT_IVB7   0x0e27
  51 #define PCI_DEVICE_ID_INTEL_IOAT_IVB8   0x0e2e
  52 #define PCI_DEVICE_ID_INTEL_IOAT_IVB9   0x0e2f
  53
  54 static struct pci_device_id ioat_pci_tbl[] = {
  55         /* I/OAT v1 platforms */
  56         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
  57         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB)  },
  58         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
  59         { PCI_VDEVICE(UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
  60
  61         /* I/OAT v2 platforms */
  62         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
  63
  64         /* I/OAT v3 platforms */
  65         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
  66         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
  67         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
  68         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
  69         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
  70         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
  71         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
  72         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
  73
  74         /* I/OAT v3.2 platforms */
  75         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
  76         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
  77         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
  78         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
  79         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
  80         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
  81         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
  82         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
  83         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
  84         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },
  85
  86         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
  87         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
  88         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
  89         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
  90         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
  91         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
  92         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
  93         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
  94         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
  95         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },
  96
  97         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) },
  98         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) },
  99         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) },
 100         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) },
 101         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) },
 102         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) },
 103         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) },
 104         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) },
 105         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) },
 106         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) },
 107
 108         { 0, }
 109 };
 110 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
 111
 112 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
 113 static void ioat_remove(struct pci_dev *pdev);
 114
 115 static int ioat_dca_enabled = 1;
 116 module_param(ioat_dca_enabled, int, 0644);
 117 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
 118
 119 struct kmem_cache *ioat2_cache;
 120
 121 #define DRV_NAME "ioatdma"
 122
 123 static struct pci_driver ioat_pci_driver = {
 124         .name           = DRV_NAME,
 125         .id_table       = ioat_pci_tbl,
 126         .probe          = ioat_pci_probe,
 127         .remove         = ioat_remove,
 128 };
 129
 130 static struct ioatdma_device *
 131 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
 132 {
 133         struct device *dev = &pdev->dev;
 134         struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
 135
 136         if (!d)
 137                 return NULL;
 138         d->pdev = pdev;
 139         d->reg_base = iobase;
 140         return d;
 141 }
 142
 143 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 144 {
 145         void __iomem * const *iomap;
 146         struct device *dev = &pdev->dev;
 147         struct ioatdma_device *device;
 148         int err;
 149
 150         err = pcim_enable_device(pdev);
 151         if (err)
 152                 return err;
 153
 154         err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
 155         if (err)
 156                 return err;
 157         iomap = pcim_iomap_table(pdev);
 158         if (!iomap)
 159                 return -ENOMEM;
 160
 161         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 162         if (err)
 163                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 164         if (err)
 165                 return err;
 166
 167         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
 168         if (err)
 169                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 170         if (err)
 171                 return err;
 172
 173         device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
 174         if (!device)
 175                 return -ENOMEM;
 176         pci_set_master(pdev);
 177         pci_set_drvdata(pdev, device);
 178
 179         device->version = readb(device->reg_base + IOAT_VER_OFFSET);
 180         if (device->version == IOAT_VER_1_2)
 181                 err = ioat1_dma_probe(device, ioat_dca_enabled);
 182         else if (device->version == IOAT_VER_2_0)
 183                 err = ioat2_dma_probe(device, ioat_dca_enabled);
 184         else if (device->version >= IOAT_VER_3_0)
 185                 err = ioat3_dma_probe(device, ioat_dca_enabled);
 186         else
 187                 return -ENODEV;
 188
 189         if (err) {
 190                 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
 191                 return -ENODEV;
 192         }
 193
 194         return 0;
 195 }
 196
 197 static void ioat_remove(struct pci_dev *pdev)
 198 {
 199         struct ioatdma_device *device = pci_get_drvdata(pdev);
 200
 201         if (!device)
 202                 return;
 203
 204         dev_err(&pdev->dev, "Removing dma and dca services\n");
 205         if (device->dca) {
 206                 unregister_dca_provider(device->dca, &pdev->dev);
 207                 free_dca_provider(device->dca);
 208                 device->dca = NULL;
 209         }
 210         ioat_dma_remove(device);
 211 }
 212
 213 static int __init ioat_init_module(void)
 214 {
 215         int err;
 216
 217         pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
 218                 DRV_NAME, IOAT_DMA_VERSION);
 219
 220         ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
 221                                         0, SLAB_HWCACHE_ALIGN, NULL);
 222         if (!ioat2_cache)
 223                 return -ENOMEM;
 224
 225         err = pci_register_driver(&ioat_pci_driver);
 226         if (err)
 227                 kmem_cache_destroy(ioat2_cache);
 228
 229         return err;
 230 }
 231 module_init(ioat_init_module);
 232
 233 static void __exit ioat_exit_module(void)
 234 {
 235         pci_unregister_driver(&ioat_pci_driver);
 236         kmem_cache_destroy(ioat2_cache);
 237 }
 238 module_exit(ioat_exit_module);