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 * The full GNU General Public License is included in this distribution in
15 * the file called "COPYING".
16 *
17 */
18
19 /*
20 * This driver supports an Intel I/OAT DMA engine, which does asynchronous
21 * copy operations.
22 */
23
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/pci.h>
27 #include <linux/interrupt.h>
28 #include <linux/dca.h>
29 #include <linux/slab.h>
30 #include "dma.h"
31 #include "dma_v2.h"
32 #include "registers.h"
33 #include "hw.h"
34
35 MODULE_VERSION(IOAT_DMA_VERSION);
36 MODULE_LICENSE("Dual BSD/GPL");
37 MODULE_AUTHOR("Intel Corporation");
38
39 static struct pci_device_id ioat_pci_tbl[] = {
40 /* I/OAT v1 platforms */
41 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
42 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) },
43 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
44 { PCI_VDEVICE(UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
45
46 /* I/OAT v2 platforms */
47 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
48
49 /* I/OAT v3 platforms */
50 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
51 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
52 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
53 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
54 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
55 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
56 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
57 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
58
59 /* I/OAT v3.2 platforms */
60 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
61 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
62 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
63 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
64 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
65 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
66 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
67 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
68 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
69 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },
70
71 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
72 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
73 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
74 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
75 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
76 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
77 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
78 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
79 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
80 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },
81
82 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) },
83 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) },
84 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) },
85 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) },
86 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) },
87 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) },
88 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) },
89 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) },
90 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) },
91 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) },
92
93 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) },
94 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) },
95 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) },
96 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) },
97 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) },
98 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) },
99 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) },
100 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) },
101 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) },
102 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) },
103
104 /* I/OAT v3.3 platforms */
105 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) },
106 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) },
107 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) },
108 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) },
109
110 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) },
111 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) },
112 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) },
113 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) },
114
115 { 0, }
116 };
117 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
118
119 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
120 static void ioat_remove(struct pci_dev *pdev);
121
122 static int ioat_dca_enabled = 1;
123 module_param(ioat_dca_enabled, int, 0644);
124 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
125
126 struct kmem_cache *ioat2_cache;
127 struct kmem_cache *ioat3_sed_cache;
128
129 #define DRV_NAME "ioatdma"
130
131 static struct pci_driver ioat_pci_driver = {
132 .name = DRV_NAME,
133 .id_table = ioat_pci_tbl,
134 .probe = ioat_pci_probe,
135 .remove = ioat_remove,
136 };
137
138 static struct ioatdma_device *
alloc_ioatdma(struct pci_dev * pdev,void __iomem * iobase)139 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
140 {
141 struct device *dev = &pdev->dev;
142 struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
143
144 if (!d)
145 return NULL;
146 d->pdev = pdev;
147 d->reg_base = iobase;
148 return d;
149 }
150
ioat_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)151 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
152 {
153 void __iomem * const *iomap;
154 struct device *dev = &pdev->dev;
155 struct ioatdma_device *device;
156 int err;
157
158 err = pcim_enable_device(pdev);
159 if (err)
160 return err;
161
162 err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
163 if (err)
164 return err;
165 iomap = pcim_iomap_table(pdev);
166 if (!iomap)
167 return -ENOMEM;
168
169 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
170 if (err)
171 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
172 if (err)
173 return err;
174
175 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
176 if (err)
177 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
178 if (err)
179 return err;
180
181 device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
182 if (!device)
183 return -ENOMEM;
184 pci_set_master(pdev);
185 pci_set_drvdata(pdev, device);
186
187 device->version = readb(device->reg_base + IOAT_VER_OFFSET);
188 if (device->version == IOAT_VER_1_2)
189 err = ioat1_dma_probe(device, ioat_dca_enabled);
190 else if (device->version == IOAT_VER_2_0)
191 err = ioat2_dma_probe(device, ioat_dca_enabled);
192 else if (device->version >= IOAT_VER_3_0)
193 err = ioat3_dma_probe(device, ioat_dca_enabled);
194 else
195 return -ENODEV;
196
197 if (err) {
198 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
199 return -ENODEV;
200 }
201
202 return 0;
203 }
204
ioat_remove(struct pci_dev * pdev)205 static void ioat_remove(struct pci_dev *pdev)
206 {
207 struct ioatdma_device *device = pci_get_drvdata(pdev);
208
209 if (!device)
210 return;
211
212 dev_err(&pdev->dev, "Removing dma and dca services\n");
213 if (device->dca) {
214 unregister_dca_provider(device->dca, &pdev->dev);
215 free_dca_provider(device->dca);
216 device->dca = NULL;
217 }
218 ioat_dma_remove(device);
219 }
220
ioat_init_module(void)221 static int __init ioat_init_module(void)
222 {
223 int err = -ENOMEM;
224
225 pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
226 DRV_NAME, IOAT_DMA_VERSION);
227
228 ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
229 0, SLAB_HWCACHE_ALIGN, NULL);
230 if (!ioat2_cache)
231 return -ENOMEM;
232
233 ioat3_sed_cache = KMEM_CACHE(ioat_sed_ent, 0);
234 if (!ioat3_sed_cache)
235 goto err_ioat2_cache;
236
237 err = pci_register_driver(&ioat_pci_driver);
238 if (err)
239 goto err_ioat3_cache;
240
241 return 0;
242
243 err_ioat3_cache:
244 kmem_cache_destroy(ioat3_sed_cache);
245
246 err_ioat2_cache:
247 kmem_cache_destroy(ioat2_cache);
248
249 return err;
250 }
251 module_init(ioat_init_module);
252
ioat_exit_module(void)253 static void __exit ioat_exit_module(void)
254 {
255 pci_unregister_driver(&ioat_pci_driver);
256 kmem_cache_destroy(ioat2_cache);
257 }
258 module_exit(ioat_exit_module);
259