summaryrefslogtreecommitdiff
path: root/linux/drm_stub.h
blob: 3d9ade35da4f4c77c7d337fa1a0129fa1b7c99cf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
/**
 * \file drm_stub.h
 * Stub support
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 */

/*
 * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
 *
 * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "drmP.h"

#define DRM_STUB_MAXCARDS 16	/* Enough for one machine */

/** Stub list. One for each minor. */
static struct drm_stub_list {
	const char             *name;
	struct file_operations *fops;	/**< file operations */
	struct proc_dir_entry  *dev_root;	/**< proc directory entry */
} *DRM(stub_list);

/**
 * File \c open operation.
 *
 * \param inode device inode.
 * \param filp file pointer.
 *
 * Puts the drm_stub_list::fops corresponding to the device minor number into
 * \p filp, call the \c open method, and restore the file operations.
 */
static int DRM(stub_open)(struct inode *inode, struct file *filp)
{
	int                    minor = iminor(inode);
	int                    err   = -ENODEV;
	struct file_operations *old_fops;

	if (!DRM(stub_list) || !DRM(stub_list)[minor].fops) return -ENODEV;
	old_fops   = filp->f_op;
	filp->f_op = fops_get(DRM(stub_list)[minor].fops);
	if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
		fops_put(filp->f_op);
		filp->f_op = fops_get(old_fops);
	}
	fops_put(old_fops);

	return err;
}

/** File operations structure */
static struct file_operations DRM(stub_fops) = {
	.owner = THIS_MODULE,
	.open  = DRM(stub_open)
};

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
static int drm_hotplug (struct class_device *dev, char **envp, int num_envp,
				char *buffer, int buffer_size)
{
	struct pci_dev *pdev;
	char *scratch;
	int i = 0;
	int length = 0;
	
	DRM_DEBUG("\n");
	if (!dev)
		return -ENODEV;

	pdev = to_pci_dev(dev->dev);
	if (!pdev)
		return -ENODEV;

	scratch = buffer;

	/* stuff we want to pass to /sbin/hotplug */
	envp[i++] = scratch;
	length += snprintf (scratch, buffer_size - length, "PCI_CLASS=%04X",
							pdev->class);
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;
	++length;
	scratch += length;

	envp[i++] = scratch;
	length += snprintf (scratch, buffer_size - length, "PCI_ID=%04X:%04X",
							pdev->vendor, pdev->device);
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;
	++length;
	scratch += length;
	
	envp[i++] = scratch;
	length += snprintf (scratch, buffer_size - length,
							"PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
							pdev->subsystem_device);
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;
	++length;
	scratch += length;

	envp[i++] = scratch;
	length += snprintf (scratch, buffer_size - length, "PCI_SLOT_NAME=%s",
							pci_name(pdev));
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;
	++length;
	scratch += length;
#if 0	
	drm_device_t *ddev;
	ddev = pci_get_drvdata(pdev);
	if (ddev) {
		envp[i++] = scratch;
		length += snprintf (scratch, buffer_size - length, 
							"RESET=%s", (ddev->need_reset ? "true" : "false"));
		if ((buffer_size - length <= 0) || (i >= num_envp))
			return -ENOMEM;
	}
#endif	
	envp[i] = 0;
	
	return 0;
}
#endif

/**
 * Get a device minor number.
 *
 * \param name driver name.
 * \param fops file operations.
 * \param dev DRM device.
 * \return minor number on success, or a negative number on failure.
 *
 * Allocate and initialize ::stub_list if one doesn't exist already.  Search an
 * empty entry and initialize it to the given parameters, and create the proc
 * init entry via proc_init().
 */
static int DRM(stub_getminor)(const char *name, struct file_operations *fops,
			      drm_device_t *dev)
{
	int i;

	if (!DRM(stub_list)) {
		DRM(stub_list) = DRM(alloc)(sizeof(*DRM(stub_list))
					    * DRM_STUB_MAXCARDS, DRM_MEM_STUB);
		if(!DRM(stub_list)) return -1;
		for (i = 0; i < DRM_STUB_MAXCARDS; i++) {
			DRM(stub_list)[i].name = NULL;
			DRM(stub_list)[i].fops = NULL;
		}
	}
	for (i = 0; i < DRM_STUB_MAXCARDS; i++) {
		if (!DRM(stub_list)[i].fops) {
			DRM(stub_list)[i].name = name;
			DRM(stub_list)[i].fops = fops;
			DRM(proc_init)(dev, i, DRM(stub_info).proc_root,
							&DRM(stub_list)[i].dev_root);
			(*DRM(stub_info).info_count)++;
			DRM_DEBUG("info count increased %d\n", *DRM(stub_info).info_count);
			
			return i;
		}
	}
	return -1;
}

/**
 * Put a device minor number.
 *
 * \param minor minor number.
 * \return always zero.
 *
 * Cleans up the proc resources. If a minor is zero then release the foreign
 * "drm" data, otherwise unregisters the "drm" data, frees the stub list and
 * unregisters the character device. 
 */
static int DRM(stub_putminor)(int minor)
{
	if (minor < 0 || minor >= DRM_STUB_MAXCARDS) return -1;
	DRM(stub_list)[minor].name = NULL;
	DRM(stub_list)[minor].fops = NULL;
	DRM(proc_cleanup)(minor, DRM(stub_info).proc_root,
			  DRM(stub_list)[minor].dev_root);

	(*DRM(stub_info).info_count)--;

	if ((*DRM(stub_info).info_count) != 0) {
		if (DRM(numdevs) == 0) {
			DRM_DEBUG("inter_module_put called %d\n", *DRM(stub_info).info_count);
			inter_module_put("drm");
		}
	} else {
		DRM_DEBUG("unregistering inter_module \n");
		inter_module_unregister("drm");
		DRM(free)(DRM(stub_list),
			  sizeof(*DRM(stub_list)) * DRM_STUB_MAXCARDS,
			  DRM_MEM_STUB);
		remove_proc_entry("dri", NULL);
		class_simple_destroy(DRM(stub_info).drm_class);
		unregister_chrdev(DRM_MAJOR, "drm");
	}
	return 0;
}

/**
 * Register.
 *
 * \param name driver name.
 * \param fops file operations
 * \param dev DRM device.
 * \return zero on success or a negative number on failure.
 *
 * Attempt to gets inter module "drm" information. If we are first
 * then register the character device and inter module information.
 * Try and register, if we fail to register, backout previous work.
 *
 * Finally calls stub_info::info_register.
 */
int DRM(stub_register)(const char *name, struct file_operations *fops,
		       drm_device_t *dev)
{
	struct drm_stub_info *i = NULL;
	int ret1;
	int ret2;

	DRM_DEBUG("\n");

	/* if we are registering a second device we don't need to worry
	   about inter module get/put and other things as they've been
	   done already */
	if (DRM(numdevs) == 0) {
		/* use the inter_module_get to check - as if the same module
		   registers chrdev twice it succeeds */
		i = (struct drm_stub_info *)inter_module_get("drm");
		if (i) {
			/* Already registered */
			DRM(stub_info).info_register   = i->info_register;
			DRM(stub_info).info_unregister = i->info_unregister;
			DRM(stub_info).drm_class = i->drm_class;
			DRM(stub_info).info_count = i->info_count;
			DRM_DEBUG("already registered %d\n", *i->info_count);
		} else if (*DRM(stub_info).info_count == 0) {

			ret1 = register_chrdev(DRM_MAJOR, "drm", &DRM(stub_fops));
			if (ret1 < 0) {
				printk (KERN_ERR "Error registering drm major number.\n");
				return ret1;
			}

			DRM(stub_info).drm_class = class_simple_create(THIS_MODULE, "drm");
			if (IS_ERR(DRM(stub_info).drm_class)) {
				printk (KERN_ERR "Error creating drm class.\n");
				unregister_chrdev(DRM_MAJOR, "drm");
				return PTR_ERR(DRM(stub_info).drm_class);
			}
			class_simple_set_hotplug(DRM(stub_info).drm_class, drm_hotplug);

			DRM_DEBUG("calling inter_module_register\n");
			inter_module_register("drm", THIS_MODULE, &DRM(stub_info));
			
			DRM(stub_info).proc_root = create_proc_entry("dri", S_IFDIR, NULL);
			if (!DRM(stub_info).proc_root) {
				DRM_ERROR("Cannot create /proc/dri\n");
				inter_module_unregister("drm");
				unregister_chrdev(DRM_MAJOR, "drm");
				class_simple_destroy(DRM(stub_info).drm_class);
				return -1;
			}
		
		}
	} else
		DRM_DEBUG("already retrieved inter_module information\n");

	if (DRM(stub_info).info_register) {
		ret2 = DRM(stub_info).info_register(name, fops, dev);
		if (ret2 < 0) {
			if (DRM(numdevs) == 0 && !i) {
				inter_module_unregister("drm");
				unregister_chrdev(DRM_MAJOR, "drm");
				class_simple_destroy(DRM(stub_info).drm_class);
				remove_proc_entry("dri", NULL);
				DRM_DEBUG("info_register failed, deregistered everything\n");
			}
			DRM_DEBUG("info_register failed\n");
			return ret2;
		}
		class_simple_device_add(DRM(stub_info).drm_class, 
				MKDEV(DRM_MAJOR, ret2), &dev->pdev->dev, "card%d", ret2);
		return ret2;
	}
	return -1;
}

/**
 * Unregister.
 *
 * \param minor
 *
 * Calls drm_stub_info::unregister.
 */
int DRM(stub_unregister)(int minor)
{
	DRM_DEBUG("%d\n", minor);
	class_simple_device_remove(MKDEV(DRM_MAJOR, minor));
	if (DRM(stub_info).info_unregister)
		return DRM(stub_info).info_unregister(minor);
	return -1;
}

int DRM(stub_count);

/** Stub information */
struct drm_stub_info DRM(stub_info) = {
	.info_register   = DRM(stub_getminor),
	.info_unregister = DRM(stub_putminor),
	.drm_class = NULL,
	.info_count = &DRM(stub_count),
	.proc_root = NULL,
};