1 /**
2 * \file drm_stub.h
3 * Stub support
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 */
7
8 /*
9 * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
10 *
11 * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18 * and/or sell copies of the Software, and to permit persons to whom the
19 * Software is furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice (including the next
22 * paragraph) shall be included in all copies or substantial portions of the
23 * Software.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
28 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
31 * DEALINGS IN THE SOFTWARE.
32 */
33
34 #include <linux/module.h>
35 #include <linux/moduleparam.h>
36 #include "drmP.h"
37 #include "drm_core.h"
38
39 unsigned int drm_cards_limit = 16; /* Enough for one machine */
40 unsigned int drm_debug = 0; /* 1 to enable debug output */
41 EXPORT_SYMBOL(drm_debug);
42
43 MODULE_AUTHOR( DRIVER_AUTHOR );
44 MODULE_DESCRIPTION( DRIVER_DESC );
45 MODULE_LICENSE("GPL and additional rights");
46 MODULE_PARM_DESC(drm_cards_limit, "Maximum number of graphics cards");
47 MODULE_PARM_DESC(drm_debug, "Enable debug output");
48
49 module_param_named(cards_limit, drm_cards_limit, int, 0444);
50 module_param_named(debug, drm_debug, int, 0666);
51
52 drm_minor_t *drm_minors;
53 struct drm_sysfs_class *drm_class;
54 struct proc_dir_entry *drm_proc_root;
55
56 static int drm_fill_in_dev(drm_device_t *dev, struct pci_dev *pdev, const struct pci_device_id *ent, struct drm_driver *driver)
57 {
58 int retcode;
59
60 spin_lock_init(&dev->count_lock);
61 init_timer( &dev->timer );
62 sema_init( &dev->struct_sem, 1 );
63 sema_init( &dev->ctxlist_sem, 1 );
64
65 dev->pdev = pdev;
66
67 #ifdef __alpha__
68 dev->hose = pdev->sysdata;
69 dev->pci_domain = dev->hose->bus->number;
70 #else
71 dev->pci_domain = 0;
72 #endif
73 dev->pci_bus = pdev->bus->number;
74 dev->pci_slot = PCI_SLOT(pdev->devfn);
75 dev->pci_func = PCI_FUNC(pdev->devfn);
76 dev->irq = pdev->irq;
77
78 /* the DRM has 6 basic counters */
79 dev->counters = 6;
80 dev->types[0] = _DRM_STAT_LOCK;
81 dev->types[1] = _DRM_STAT_OPENS;
82 dev->types[2] = _DRM_STAT_CLOSES;
83 dev->types[3] = _DRM_STAT_IOCTLS;
84 dev->types[4] = _DRM_STAT_LOCKS;
85 dev->types[5] = _DRM_STAT_UNLOCKS;
86
87 dev->driver = driver;
88
89 if (dev->driver->preinit)
90 if ((retcode = dev->driver->preinit(dev, ent->driver_data)))
91 goto error_out_unreg;
92
93 if (drm_core_has_AGP(dev)) {
94 dev->agp = drm_agp_init();
95 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP) && (dev->agp == NULL)) {
96 DRM_ERROR( "Cannot initialize the agpgart module.\n" );
97 retcode = -EINVAL;
98 goto error_out_unreg;
99 }
100 if (drm_core_has_MTRR(dev)) {
101 if (dev->agp)
102 dev->agp->agp_mtrr = mtrr_add( dev->agp->agp_info.aper_base,
103 dev->agp->agp_info.aper_size*1024*1024,
104 MTRR_TYPE_WRCOMB,
105 1 );
106 }
107 }
108
109 retcode = drm_ctxbitmap_init( dev );
110 if( retcode ) {
111 DRM_ERROR( "Cannot allocate memory for context bitmap.\n" );
112 goto error_out_unreg;
113 }
114
115 dev->device = MKDEV(DRM_MAJOR, dev->minor );
116
117 /* postinit is a required function to display the signon banner */
118 if ((retcode = dev->driver->postinit(dev, ent->driver_data)))
119 goto error_out_unreg;
120
121 return 0;
122
123 error_out_unreg:
124 drm_takedown(dev);
125 return retcode;
126 }
127
128 /**
129 * File \c open operation.
130 *
131 * \param inode device inode.
132 * \param filp file pointer.
133 *
134 * Puts the dev->fops corresponding to the device minor number into
135 * \p filp, call the \c open method, and restore the file operations.
136 */
137 int drm_stub_open(struct inode *inode, struct file *filp)
138 {
139 drm_device_t *dev = NULL;
140 int minor = iminor(inode);
141 int err = -ENODEV;
142 struct file_operations *old_fops;
143
144 DRM_DEBUG("\n");
145
146 if (!((minor >= 0) && (minor < drm_cards_limit)))
147 return -ENODEV;
148
149 dev = drm_minors[minor].dev;
150 if (!dev)
151 return -ENODEV;
152
153 old_fops = filp->f_op;
154 filp->f_op = fops_get(&dev->driver->fops);
155 if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
156 fops_put(filp->f_op);
157 filp->f_op = fops_get(old_fops);
158 }
159 fops_put(old_fops);
160
161 return err;
162 }
163
164 /**
165 * Get a device minor number.
166 *
167 * \param pdev PCI device structure
168 * \param ent entry from the PCI ID table with device type flags
169 * \return zero on success or a negative number on failure.
170 *
171 * Attempt to gets inter module "drm" information. If we are first
172 * then register the character device and inter module information.
173 * Try and register, if we fail to register, backout previous work.
174 */
175 int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent, struct drm_driver *driver)
176 {
177 struct class_device *dev_class;
178 drm_device_t *dev;
179 int ret;
180 int minor;
181 drm_minor_t *minors = &drm_minors[0];
182
183 DRM_DEBUG("\n");
184
185 for (minor = 0; minor < drm_cards_limit; minor++, minors++) {
186 if (minors->type == DRM_MINOR_FREE) {
187
188 DRM_DEBUG("assigning minor %d\n", minor);
189 dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
190 if (!dev)
191 return -ENOMEM;
192
193 *minors = (drm_minor_t){.dev = dev, .type=DRM_MINOR_PRIMARY};
194 dev->minor = minor;
195
196 pci_enable_device(pdev);
197
198 if ((ret=drm_fill_in_dev(dev, pdev, ent, driver))) {
199 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
200 goto err_g1;
201 }
202 if ((ret = drm_proc_init(dev, minor, drm_proc_root, &minors->dev_root))) {
203 printk (KERN_ERR "DRM: Failed to initialize /proc/dri.\n");
204 goto err_g1;
205 }
206
207
208 dev_class = drm_sysfs_device_add(drm_class,
209 MKDEV(DRM_MAJOR,
210 minor),
211 &pdev->dev,
212 "card%d", minor);
213 if (IS_ERR(dev_class)) {
214 printk(KERN_ERR "DRM: Error sysfs_device_add.\n");
215 ret = PTR_ERR(dev_class);
216 goto err_g2;
217 }
218
219 DRM_DEBUG("new minor assigned %d\n", minor);
220 return 0;
221 }
222 }
223 DRM_ERROR("out of minors\n");
224 return -ENOMEM;
225 err_g2:
226 drm_proc_cleanup(minor, drm_proc_root, minors->dev_root);
227 err_g1:
228 *minors = (drm_minor_t){.dev = NULL, .type = DRM_MINOR_FREE};
229 drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
230 return ret;
231 }
232 EXPORT_SYMBOL(drm_probe);
233
234
235 /**
236 * Put a device minor number.
237 *
238 * \param minor minor number.
239 * \return always zero.
240 *
241 * Cleans up the proc resources. If a minor is zero then release the foreign
242 * "drm" data, otherwise unregisters the "drm" data, frees the stub list and
243 * unregisters the character device.
244 */
245 int drm_put_minor(drm_device_t *dev)
246 {
247 drm_minor_t *minors = &drm_minors[dev->minor];
248
249 DRM_DEBUG("release minor %d\n", dev->minor);
250
251 drm_proc_cleanup(dev->minor, drm_proc_root, minors->dev_root);
252 drm_sysfs_device_remove(MKDEV(DRM_MAJOR, dev->minor));
253
254 *minors = (drm_minor_t){.dev = NULL, .type = DRM_MINOR_FREE};
255 drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
256
257 return 0;
258 }
259
260
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