summaryrefslogtreecommitdiffstats
path: root/drivers/video/aperture.c
blob: 9e6bcc03a1a4a51121f49cca5c894d7dfc772bb0 (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
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
// SPDX-License-Identifier: MIT

#include <linux/aperture.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/sysfb.h>
#include <linux/types.h>
#include <linux/vgaarb.h>

#include <video/vga.h>

/**
 * DOC: overview
 *
 * A graphics device might be supported by different drivers, but only one
 * driver can be active at any given time. Many systems load a generic
 * graphics drivers, such as EFI-GOP or VESA, early during the boot process.
 * During later boot stages, they replace the generic driver with a dedicated,
 * hardware-specific driver. To take over the device the dedicated driver
 * first has to remove the generic driver. Aperture functions manage
 * ownership of framebuffer memory and hand-over between drivers.
 *
 * Graphics drivers should call aperture_remove_conflicting_devices()
 * at the top of their probe function. The function removes any generic
 * driver that is currently associated with the given framebuffer memory.
 * An example for a graphics device on the platform bus is shown below.
 *
 * .. code-block:: c
 *
 *	static int example_probe(struct platform_device *pdev)
 *	{
 *		struct resource *mem;
 *		resource_size_t base, size;
 *		int ret;
 *
 *		mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 *		if (!mem)
 *			return -ENODEV;
 *		base = mem->start;
 *		size = resource_size(mem);
 *
 *		ret = aperture_remove_conflicting_devices(base, size, false, "example");
 *		if (ret)
 *			return ret;
 *
 *		// Initialize the hardware
 *		...
 *
 *		return 0;
 *	}
 *
 *	static const struct platform_driver example_driver = {
 *		.probe = example_probe,
 *		...
 *	};
 *
 * The given example reads the platform device's I/O-memory range from the
 * device instance. An active framebuffer will be located within this range.
 * The call to aperture_remove_conflicting_devices() releases drivers that
 * have previously claimed ownership of the range and are currently driving
 * output on the framebuffer. If successful, the new driver can take over
 * the device.
 *
 * While the given example uses a platform device, the aperture helpers work
 * with every bus that has an addressable framebuffer. In the case of PCI,
 * device drivers can also call aperture_remove_conflicting_pci_devices() and
 * let the function detect the apertures automatically. Device drivers without
 * knowledge of the framebuffer's location can call
 * aperture_remove_all_conflicting_devices(), which removes all known devices.
 *
 * Drivers that are susceptible to being removed by other drivers, such as
 * generic EFI or VESA drivers, have to register themselves as owners of their
 * framebuffer apertures. Ownership of the framebuffer memory is achieved
 * by calling devm_aperture_acquire_for_platform_device(). If successful, the
 * driveris the owner of the framebuffer range. The function fails if the
 * framebuffer is already owned by another driver. See below for an example.
 *
 * .. code-block:: c
 *
 *	static int generic_probe(struct platform_device *pdev)
 *	{
 *		struct resource *mem;
 *		resource_size_t base, size;
 *
 *		mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 *		if (!mem)
 *			return -ENODEV;
 *		base = mem->start;
 *		size = resource_size(mem);
 *
 *		ret = devm_aperture_acquire_for_platform_device(pdev, base, size);
 *		if (ret)
 *			return ret;
 *
 *		// Initialize the hardware
 *		...
 *
 *		return 0;
 *	}
 *
 *	static int generic_remove(struct platform_device *)
 *	{
 *		// Hot-unplug the device
 *		...
 *
 *		return 0;
 *	}
 *
 *	static const struct platform_driver generic_driver = {
 *		.probe = generic_probe,
 *		.remove = generic_remove,
 *		...
 *	};
 *
 * The similar to the previous example, the generic driver claims ownership
 * of the framebuffer memory from its probe function. This will fail if the
 * memory range, or parts of it, is already owned by another driver.
 *
 * If successful, the generic driver is now subject to forced removal by
 * another driver. This only works for platform drivers that support hot
 * unplugging. When a driver calls aperture_remove_conflicting_devices()
 * et al for the registered framebuffer range, the aperture helpers call
 * platform_device_unregister() and the generic driver unloads itself. The
 * generic driver also has to provide a remove function to make this work.
 * Once hot unplugged fro mhardware, it may not access the device's
 * registers, framebuffer memory, ROM, etc afterwards.
 */

struct aperture_range {
	struct device *dev;
	resource_size_t base;
	resource_size_t size;
	struct list_head lh;
	void (*detach)(struct device *dev);
};

static LIST_HEAD(apertures);
static DEFINE_MUTEX(apertures_lock);

static bool overlap(resource_size_t base1, resource_size_t end1,
		    resource_size_t base2, resource_size_t end2)
{
	return (base1 < end2) && (end1 > base2);
}

static void devm_aperture_acquire_release(void *data)
{
	struct aperture_range *ap = data;
	bool detached = !ap->dev;

	if (detached)
		return;

	mutex_lock(&apertures_lock);
	list_del(&ap->lh);
	mutex_unlock(&apertures_lock);
}

static int devm_aperture_acquire(struct device *dev,
				 resource_size_t base, resource_size_t size,
				 void (*detach)(struct device *))
{
	size_t end = base + size;
	struct list_head *pos;
	struct aperture_range *ap;

	mutex_lock(&apertures_lock);

	list_for_each(pos, &apertures) {
		ap = container_of(pos, struct aperture_range, lh);
		if (overlap(base, end, ap->base, ap->base + ap->size)) {
			mutex_unlock(&apertures_lock);
			return -EBUSY;
		}
	}

	ap = devm_kzalloc(dev, sizeof(*ap), GFP_KERNEL);
	if (!ap) {
		mutex_unlock(&apertures_lock);
		return -ENOMEM;
	}

	ap->dev = dev;
	ap->base = base;
	ap->size = size;
	ap->detach = detach;
	INIT_LIST_HEAD(&ap->lh);

	list_add(&ap->lh, &apertures);

	mutex_unlock(&apertures_lock);

	return devm_add_action_or_reset(dev, devm_aperture_acquire_release, ap);
}

static void aperture_detach_platform_device(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);

	/*
	 * Remove the device from the device hierarchy. This is the right thing
	 * to do for firmware-based DRM drivers, such as EFI, VESA or VGA. After
	 * the new driver takes over the hardware, the firmware device's state
	 * will be lost.
	 *
	 * For non-platform devices, a new callback would be required.
	 *
	 * If the aperture helpers ever need to handle native drivers, this call
	 * would only have to unplug the DRM device, so that the hardware device
	 * stays around after detachment.
	 */
	platform_device_unregister(pdev);
}

/**
 * devm_aperture_acquire_for_platform_device - Acquires ownership of an aperture
 *                                             on behalf of a platform device.
 * @pdev:	the platform device to own the aperture
 * @base:	the aperture's byte offset in physical memory
 * @size:	the aperture size in bytes
 *
 * Installs the given device as the new owner of the aperture. The function
 * expects the aperture to be provided by a platform device. If another
 * driver takes over ownership of the aperture, aperture helpers will then
 * unregister the platform device automatically. All acquired apertures are
 * released automatically when the underlying device goes away.
 *
 * The function fails if the aperture, or parts of it, is currently
 * owned by another device. To evict current owners, callers should use
 * remove_conflicting_devices() et al. before calling this function.
 *
 * Returns:
 * 0 on success, or a negative errno value otherwise.
 */
int devm_aperture_acquire_for_platform_device(struct platform_device *pdev,
					      resource_size_t base,
					      resource_size_t size)
{
	return devm_aperture_acquire(&pdev->dev, base, size, aperture_detach_platform_device);
}
EXPORT_SYMBOL(devm_aperture_acquire_for_platform_device);

static void aperture_detach_devices(resource_size_t base, resource_size_t size)
{
	resource_size_t end = base + size;
	struct list_head *pos, *n;

	mutex_lock(&apertures_lock);

	list_for_each_safe(pos, n, &apertures) {
		struct aperture_range *ap = container_of(pos, struct aperture_range, lh);
		struct device *dev = ap->dev;

		if (WARN_ON_ONCE(!dev))
			continue;

		if (!overlap(base, end, ap->base, ap->base + ap->size))
			continue;

		ap->dev = NULL; /* detach from device */
		list_del(&ap->lh);

		ap->detach(dev);
	}

	mutex_unlock(&apertures_lock);
}

/**
 * aperture_remove_conflicting_devices - remove devices in the given range
 * @base: the aperture's base address in physical memory
 * @size: aperture size in bytes
 * @primary: also kick vga16fb if present; only relevant for VGA devices
 * @name: a descriptive name of the requesting driver
 *
 * This function removes devices that own apertures within @base and @size.
 *
 * Returns:
 * 0 on success, or a negative errno code otherwise
 */
int aperture_remove_conflicting_devices(resource_size_t base, resource_size_t size,
					bool primary, const char *name)
{
	/*
	 * If a driver asked to unregister a platform device registered by
	 * sysfb, then can be assumed that this is a driver for a display
	 * that is set up by the system firmware and has a generic driver.
	 *
	 * Drivers for devices that don't have a generic driver will never
	 * ask for this, so let's assume that a real driver for the display
	 * was already probed and prevent sysfb to register devices later.
	 */
	sysfb_disable();

	aperture_detach_devices(base, size);

	/*
	 * If this is the primary adapter, there could be a VGA device
	 * that consumes the VGA framebuffer I/O range. Remove this device
	 * as well.
	 */
	if (primary)
		aperture_detach_devices(VGA_FB_PHYS_BASE, VGA_FB_PHYS_SIZE);

	return 0;
}
EXPORT_SYMBOL(aperture_remove_conflicting_devices);

/**
 * aperture_remove_conflicting_pci_devices - remove existing framebuffers for PCI devices
 * @pdev: PCI device
 * @name: a descriptive name of the requesting driver
 *
 * This function removes devices that own apertures within any of @pdev's
 * memory bars. The function assumes that PCI device with shadowed ROM
 * drives a primary display and therefore kicks out vga16fb as well.
 *
 * Returns:
 * 0 on success, or a negative errno code otherwise
 */
int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *name)
{
	bool primary = false;
	resource_size_t base, size;
	int bar, ret;

#ifdef CONFIG_X86
	primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
#endif

	for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) {
		if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
			continue;

		base = pci_resource_start(pdev, bar);
		size = pci_resource_len(pdev, bar);
		ret = aperture_remove_conflicting_devices(base, size, primary, name);
		if (ret)
			break;
	}

	if (ret)
		return ret;

	/*
	 * WARNING: Apparently we must kick fbdev drivers before vgacon,
	 * otherwise the vga fbdev driver falls over.
	 */
	ret = vga_remove_vgacon(pdev);
	if (ret)
		return ret;

	return 0;

}
EXPORT_SYMBOL(aperture_remove_conflicting_pci_devices);