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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  * 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 *
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 
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 
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 
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 
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 

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