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pci.c
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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 __devinit ioat_pci_probe(struct pci_dev *pdev,
113  const struct pci_device_id *id);
114 static void __devexit ioat_remove(struct pci_dev *pdev);
115 
116 static int ioat_dca_enabled = 1;
117 module_param(ioat_dca_enabled, int, 0644);
118 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
119 
120 struct kmem_cache *ioat2_cache;
121 
122 #define DRV_NAME "ioatdma"
123 
124 static struct pci_driver ioat_pci_driver = {
125  .name = DRV_NAME,
126  .id_table = ioat_pci_tbl,
127  .probe = ioat_pci_probe,
128  .remove = __devexit_p(ioat_remove),
129 };
130 
131 static struct ioatdma_device *
132 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
133 {
134  struct device *dev = &pdev->dev;
135  struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
136 
137  if (!d)
138  return NULL;
139  d->pdev = pdev;
140  d->reg_base = iobase;
141  return d;
142 }
143 
144 static int __devinit ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
145 {
146  void __iomem * const *iomap;
147  struct device *dev = &pdev->dev;
148  struct ioatdma_device *device;
149  int err;
150 
151  err = pcim_enable_device(pdev);
152  if (err)
153  return err;
154 
155  err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
156  if (err)
157  return err;
158  iomap = pcim_iomap_table(pdev);
159  if (!iomap)
160  return -ENOMEM;
161 
162  err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
163  if (err)
164  err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
165  if (err)
166  return err;
167 
168  err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
169  if (err)
170  err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
171  if (err)
172  return err;
173 
174  device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
175  if (!device)
176  return -ENOMEM;
177  pci_set_master(pdev);
178  pci_set_drvdata(pdev, device);
179 
180  device->version = readb(device->reg_base + IOAT_VER_OFFSET);
181  if (device->version == IOAT_VER_1_2)
182  err = ioat1_dma_probe(device, ioat_dca_enabled);
183  else if (device->version == IOAT_VER_2_0)
184  err = ioat2_dma_probe(device, ioat_dca_enabled);
185  else if (device->version >= IOAT_VER_3_0)
186  err = ioat3_dma_probe(device, ioat_dca_enabled);
187  else
188  return -ENODEV;
189 
190  if (err) {
191  dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
192  return -ENODEV;
193  }
194 
195  return 0;
196 }
197 
198 static void __devexit ioat_remove(struct pci_dev *pdev)
199 {
200  struct ioatdma_device *device = pci_get_drvdata(pdev);
201 
202  if (!device)
203  return;
204 
205  dev_err(&pdev->dev, "Removing dma and dca services\n");
206  if (device->dca) {
207  unregister_dca_provider(device->dca, &pdev->dev);
208  free_dca_provider(device->dca);
209  device->dca = NULL;
210  }
211  ioat_dma_remove(device);
212 }
213 
214 static int __init ioat_init_module(void)
215 {
216  int err;
217 
218  pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
219  DRV_NAME, IOAT_DMA_VERSION);
220 
221  ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
222  0, SLAB_HWCACHE_ALIGN, NULL);
223  if (!ioat2_cache)
224  return -ENOMEM;
225 
226  err = pci_register_driver(&ioat_pci_driver);
227  if (err)
228  kmem_cache_destroy(ioat2_cache);
229 
230  return err;
231 }
232 module_init(ioat_init_module);
233 
234 static void __exit ioat_exit_module(void)
235 {
236  pci_unregister_driver(&ioat_pci_driver);
237  kmem_cache_destroy(ioat2_cache);
238 }
239 module_exit(ioat_exit_module);
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