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Linux/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 static 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         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) },
115         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) },
116         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) },
117         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) },
118 
119         { 0, }
120 };
121 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
122 
123 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
124 static void ioat_remove(struct pci_dev *pdev);
125 
126 static int ioat_dca_enabled = 1;
127 module_param(ioat_dca_enabled, int, 0644);
128 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
129 
130 struct kmem_cache *ioat2_cache;
131 struct kmem_cache *ioat3_sed_cache;
132 
133 #define DRV_NAME "ioatdma"
134 
135 static struct pci_driver ioat_pci_driver = {
136         .name           = DRV_NAME,
137         .id_table       = ioat_pci_tbl,
138         .probe          = ioat_pci_probe,
139         .remove         = ioat_remove,
140 };
141 
142 static struct ioatdma_device *
143 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
144 {
145         struct device *dev = &pdev->dev;
146         struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
147 
148         if (!d)
149                 return NULL;
150         d->pdev = pdev;
151         d->reg_base = iobase;
152         return d;
153 }
154 
155 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
156 {
157         void __iomem * const *iomap;
158         struct device *dev = &pdev->dev;
159         struct ioatdma_device *device;
160         int err;
161 
162         err = pcim_enable_device(pdev);
163         if (err)
164                 return err;
165 
166         err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
167         if (err)
168                 return err;
169         iomap = pcim_iomap_table(pdev);
170         if (!iomap)
171                 return -ENOMEM;
172 
173         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
174         if (err)
175                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
176         if (err)
177                 return err;
178 
179         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
180         if (err)
181                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
182         if (err)
183                 return err;
184 
185         device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
186         if (!device)
187                 return -ENOMEM;
188         pci_set_master(pdev);
189         pci_set_drvdata(pdev, device);
190 
191         device->version = readb(device->reg_base + IOAT_VER_OFFSET);
192         if (device->version == IOAT_VER_1_2)
193                 err = ioat1_dma_probe(device, ioat_dca_enabled);
194         else if (device->version == IOAT_VER_2_0)
195                 err = ioat2_dma_probe(device, ioat_dca_enabled);
196         else if (device->version >= IOAT_VER_3_0)
197                 err = ioat3_dma_probe(device, ioat_dca_enabled);
198         else
199                 return -ENODEV;
200 
201         if (err) {
202                 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
203                 return -ENODEV;
204         }
205 
206         return 0;
207 }
208 
209 static void ioat_remove(struct pci_dev *pdev)
210 {
211         struct ioatdma_device *device = pci_get_drvdata(pdev);
212 
213         if (!device)
214                 return;
215 
216         dev_err(&pdev->dev, "Removing dma and dca services\n");
217         if (device->dca) {
218                 unregister_dca_provider(device->dca, &pdev->dev);
219                 free_dca_provider(device->dca);
220                 device->dca = NULL;
221         }
222         ioat_dma_remove(device);
223 }
224 
225 static int __init ioat_init_module(void)
226 {
227         int err = -ENOMEM;
228 
229         pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
230                 DRV_NAME, IOAT_DMA_VERSION);
231 
232         ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
233                                         0, SLAB_HWCACHE_ALIGN, NULL);
234         if (!ioat2_cache)
235                 return -ENOMEM;
236 
237         ioat3_sed_cache = KMEM_CACHE(ioat_sed_ent, 0);
238         if (!ioat3_sed_cache)
239                 goto err_ioat2_cache;
240 
241         err = pci_register_driver(&ioat_pci_driver);
242         if (err)
243                 goto err_ioat3_cache;
244 
245         return 0;
246 
247  err_ioat3_cache:
248         kmem_cache_destroy(ioat3_sed_cache);
249 
250  err_ioat2_cache:
251         kmem_cache_destroy(ioat2_cache);
252 
253         return err;
254 }
255 module_init(ioat_init_module);
256 
257 static void __exit ioat_exit_module(void)
258 {
259         pci_unregister_driver(&ioat_pci_driver);
260         kmem_cache_destroy(ioat2_cache);
261 }
262 module_exit(ioat_exit_module);
263 

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