tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
39MODULE_VERSION(IOAT_DMA_VERSION);
40MODULE_LICENSE("Dual BSD/GPL");
41MODULE_AUTHOR("Intel Corporation");
42
43static 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 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
76 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
77 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
78 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
79 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
80 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
81 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
82 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
83 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
84 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },
85
86 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) },
87 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) },
88 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) },
89 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) },
90 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) },
91 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) },
92 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) },
93 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) },
94 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) },
95 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) },
96
97 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) },
98 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) },
99 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) },
100 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) },
101 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) },
102 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) },
103 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) },
104 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) },
105 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) },
106 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) },
107
108 /* I/OAT v3.3 platforms */
109 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) },
110 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) },
111 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) },
112 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) },
113
114 { 0, }
115};
116MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
117
118static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
119static void ioat_remove(struct pci_dev *pdev);
120
121static int ioat_dca_enabled = 1;
122module_param(ioat_dca_enabled, int, 0644);
123MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
124
125struct kmem_cache *ioat2_cache;
126
127#define DRV_NAME "ioatdma"
128
129static struct pci_driver ioat_pci_driver = {
130 .name = DRV_NAME,
131 .id_table = ioat_pci_tbl,
132 .probe = ioat_pci_probe,
133 .remove = ioat_remove,
134};
135
136static struct ioatdma_device *
137alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
138{
139 struct device *dev = &pdev->dev;
140 struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
141
142 if (!d)
143 return NULL;
144 d->pdev = pdev;
145 d->reg_base = iobase;
146 return d;
147}
148
149static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
150{
151 void __iomem * const *iomap;
152 struct device *dev = &pdev->dev;
153 struct ioatdma_device *device;
154 int err;
155
156 err = pcim_enable_device(pdev);
157 if (err)
158 return err;
159
160 err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
161 if (err)
162 return err;
163 iomap = pcim_iomap_table(pdev);
164 if (!iomap)
165 return -ENOMEM;
166
167 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
168 if (err)
169 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
170 if (err)
171 return err;
172
173 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
174 if (err)
175 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
176 if (err)
177 return err;
178
179 device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
180 if (!device)
181 return -ENOMEM;
182 pci_set_master(pdev);
183 pci_set_drvdata(pdev, device);
184
185 device->version = readb(device->reg_base + IOAT_VER_OFFSET);
186 if (device->version == IOAT_VER_1_2)
187 err = ioat1_dma_probe(device, ioat_dca_enabled);
188 else if (device->version == IOAT_VER_2_0)
189 err = ioat2_dma_probe(device, ioat_dca_enabled);
190 else if (device->version >= IOAT_VER_3_0)
191 err = ioat3_dma_probe(device, ioat_dca_enabled);
192 else
193 return -ENODEV;
194
195 if (err) {
196 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
197 return -ENODEV;
198 }
199
200 return 0;
201}
202
203static void ioat_remove(struct pci_dev *pdev)
204{
205 struct ioatdma_device *device = pci_get_drvdata(pdev);
206
207 if (!device)
208 return;
209
210 if (device->version >= IOAT_VER_3_0)
211 ioat3_dma_remove(device);
212
213 dev_err(&pdev->dev, "Removing dma and dca services\n");
214 if (device->dca) {
215 unregister_dca_provider(device->dca, &pdev->dev);
216 free_dca_provider(device->dca);
217 device->dca = NULL;
218 }
219 ioat_dma_remove(device);
220}
221
222static int __init ioat_init_module(void)
223{
224 int err;
225
226 pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
227 DRV_NAME, IOAT_DMA_VERSION);
228
229 ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
230 0, SLAB_HWCACHE_ALIGN, NULL);
231 if (!ioat2_cache)
232 return -ENOMEM;
233
234 err = pci_register_driver(&ioat_pci_driver);
235 if (err)
236 kmem_cache_destroy(ioat2_cache);
237
238 return err;
239}
240module_init(ioat_init_module);
241
242static void __exit ioat_exit_module(void)
243{
244 pci_unregister_driver(&ioat_pci_driver);
245 kmem_cache_destroy(ioat2_cache);
246}
247module_exit(ioat_exit_module);