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 { 0, }
76};
77MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
78
79static int __devinit ioat_pci_probe(struct pci_dev *pdev,
80 const struct pci_device_id *id);
81static void __devexit ioat_remove(struct pci_dev *pdev);
82
83static int ioat_dca_enabled = 1;
84module_param(ioat_dca_enabled, int, 0644);
85MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
86
87struct kmem_cache *ioat2_cache;
88
89#define DRV_NAME "ioatdma"
90
91static struct pci_driver ioat_pci_driver = {
92 .name = DRV_NAME,
93 .id_table = ioat_pci_tbl,
94 .probe = ioat_pci_probe,
95 .remove = __devexit_p(ioat_remove),
96};
97
98static struct ioatdma_device *
99alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
100{
101 struct device *dev = &pdev->dev;
102 struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
103
104 if (!d)
105 return NULL;
106 d->pdev = pdev;
107 d->reg_base = iobase;
108 return d;
109}
110
111static int __devinit ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
112{
113 void __iomem * const *iomap;
114 struct device *dev = &pdev->dev;
115 struct ioatdma_device *device;
116 int err;
117
118 err = pcim_enable_device(pdev);
119 if (err)
120 return err;
121
122 err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
123 if (err)
124 return err;
125 iomap = pcim_iomap_table(pdev);
126 if (!iomap)
127 return -ENOMEM;
128
129 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
130 if (err)
131 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
132 if (err)
133 return err;
134
135 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
136 if (err)
137 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
138 if (err)
139 return err;
140
141 device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
142 if (!device)
143 return -ENOMEM;
144 pci_set_master(pdev);
145 pci_set_drvdata(pdev, device);
146
147 device->version = readb(device->reg_base + IOAT_VER_OFFSET);
148 if (device->version == IOAT_VER_1_2)
149 err = ioat1_dma_probe(device, ioat_dca_enabled);
150 else if (device->version == IOAT_VER_2_0)
151 err = ioat2_dma_probe(device, ioat_dca_enabled);
152 else if (device->version >= IOAT_VER_3_0)
153 err = ioat3_dma_probe(device, ioat_dca_enabled);
154 else
155 return -ENODEV;
156
157 if (err) {
158 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
159 return -ENODEV;
160 }
161
162 return 0;
163}
164
165static void __devexit ioat_remove(struct pci_dev *pdev)
166{
167 struct ioatdma_device *device = pci_get_drvdata(pdev);
168
169 if (!device)
170 return;
171
172 dev_err(&pdev->dev, "Removing dma and dca services\n");
173 if (device->dca) {
174 unregister_dca_provider(device->dca, &pdev->dev);
175 free_dca_provider(device->dca);
176 device->dca = NULL;
177 }
178 ioat_dma_remove(device);
179}
180
181static int __init ioat_init_module(void)
182{
183 int err;
184
185 pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
186 DRV_NAME, IOAT_DMA_VERSION);
187
188 ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
189 0, SLAB_HWCACHE_ALIGN, NULL);
190 if (!ioat2_cache)
191 return -ENOMEM;
192
193 err = pci_register_driver(&ioat_pci_driver);
194 if (err)
195 kmem_cache_destroy(ioat2_cache);
196
197 return err;
198}
199module_init(ioat_init_module);
200
201static void __exit ioat_exit_module(void)
202{
203 pci_unregister_driver(&ioat_pci_driver);
204 kmem_cache_destroy(ioat2_cache);
205}
206module_exit(ioat_exit_module);