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

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