aboutsummaryrefslogtreecommitdiff
path: root/linux-core/drm_memory.c
blob: 12e01414fcda77a9211815ce87df365bc3fdf8e2 (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
/**
 * \file drm_memory.c
 * Memory management wrappers for DRM
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Thu Feb  4 14:00:34 1999 by faith@valinux.com
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 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
 * VA LINUX SYSTEMS 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 <linux/highmem.h>
#include "drmP.h"

static struct {
	spinlock_t lock;
	uint64_t cur_used;
	uint64_t emer_used;
	uint64_t low_threshold;
	uint64_t high_threshold;
	uint64_t emer_threshold;
} drm_memctl = {
	.lock = SPIN_LOCK_UNLOCKED
};

static inline size_t drm_size_align(size_t size)
{
	size_t tmpSize = 4;
	if (size > PAGE_SIZE)
		return PAGE_ALIGN(size);

	while (tmpSize < size)
		tmpSize <<= 1;

	return (size_t) tmpSize;
}

int drm_alloc_memctl(size_t size)
{
	int ret = 0;
	unsigned long a_size = drm_size_align(size);
	unsigned long new_used = drm_memctl.cur_used + a_size;

	spin_lock(&drm_memctl.lock);
	if (unlikely(new_used > drm_memctl.high_threshold)) {
		if (!DRM_SUSER(DRM_CURPROC) ||
		    (new_used + drm_memctl.emer_used > drm_memctl.emer_threshold) ||
		    (a_size > 2*PAGE_SIZE)) {
			ret = -ENOMEM;
			goto out;
		}

		/*
		 * Allow small root-only allocations, even if the
		 * high threshold is exceeded.
		 */

		new_used -= drm_memctl.high_threshold;
		drm_memctl.emer_used += new_used;
		a_size -= new_used;
	}
	drm_memctl.cur_used += a_size;
out:
	spin_unlock(&drm_memctl.lock);
	return ret;
}
EXPORT_SYMBOL(drm_alloc_memctl);

void drm_free_memctl(size_t size)
{
	unsigned long a_size = drm_size_align(size);

	spin_lock(&drm_memctl.lock);
	if (likely(a_size >= drm_memctl.emer_used)) {
		a_size -= drm_memctl.emer_used;
		drm_memctl.emer_used = 0;
	} else {
		drm_memctl.emer_used -= a_size;
		a_size = 0;
	}
	drm_memctl.cur_used -= a_size;
	spin_unlock(&drm_memctl.lock);
}
EXPORT_SYMBOL(drm_free_memctl);

void drm_query_memctl(uint64_t *cur_used,
		      uint64_t *emer_used,
		      uint64_t *low_threshold,
		      uint64_t *high_threshold,
		      uint64_t *emer_threshold)
{
	spin_lock(&drm_memctl.lock);
	*cur_used = drm_memctl.cur_used;
	*emer_used = drm_memctl.emer_used;
	*low_threshold = drm_memctl.low_threshold;
	*high_threshold = drm_memctl.high_threshold;
	*emer_threshold = drm_memctl.emer_threshold;
	spin_unlock(&drm_memctl.lock);
}
EXPORT_SYMBOL(drm_query_memctl);

void drm_init_memctl(size_t p_low_threshold,
		     size_t p_high_threshold,
		     size_t unit_size)
{
	spin_lock(&drm_memctl.lock);
	drm_memctl.emer_used = 0;
	drm_memctl.cur_used = 0;
	drm_memctl.low_threshold = p_low_threshold * unit_size;
	drm_memctl.high_threshold = p_high_threshold * unit_size;
	drm_memctl.emer_threshold = (drm_memctl.high_threshold >> 4) +
		drm_memctl.high_threshold;
	spin_unlock(&drm_memctl.lock);
}


#ifndef DEBUG_MEMORY

/** No-op. */
void drm_mem_init(void)
{
}

/**
 * Called when "/proc/dri/%dev%/mem" is read.
 *
 * \param buf output buffer.
 * \param start start of output data.
 * \param offset requested start offset.
 * \param len requested number of bytes.
 * \param eof whether there is no more data to return.
 * \param data private data.
 * \return number of written bytes.
 *
 * No-op.
 */
int drm_mem_info(char *buf, char **start, off_t offset,
		 int len, int *eof, void *data)
{
	return 0;
}

/** Wrapper around kmalloc() */
void *drm_calloc(size_t nmemb, size_t size, int area)
{
	return kcalloc(nmemb, size, GFP_KERNEL);
}
EXPORT_SYMBOL(drm_calloc);

/** Wrapper around kmalloc() and kfree() */
void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area)
{
	void *pt;

	if (!(pt = kmalloc(size, GFP_KERNEL)))
		return NULL;
	if (oldpt && oldsize) {
		memcpy(pt, oldpt, oldsize);
		kfree(oldpt);
	}
	return pt;
}

/**
 * Allocate pages.
 *
 * \param order size order.
 * \param area memory area. (Not used.)
 * \return page address on success, or zero on failure.
 *
 * Allocate and reserve free pages.
 */
unsigned long drm_alloc_pages(int order, int area)
{
	unsigned long address;
	unsigned long bytes = PAGE_SIZE << order;
	unsigned long addr;
	unsigned int sz;

	address = __get_free_pages(GFP_KERNEL, order);
	if (!address)
		return 0;

	/* Zero */
	memset((void *)address, 0, bytes);

	/* Reserve */
	for (addr = address, sz = bytes;
	     sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
		SetPageReserved(virt_to_page(addr));
	}

	return address;
}

/**
 * Free pages.
 *
 * \param address address of the pages to free.
 * \param order size order.
 * \param area memory area. (Not used.)
 *
 * Unreserve and free pages allocated by alloc_pages().
 */
void drm_free_pages(unsigned long address, int order, int area)
{
	unsigned long bytes = PAGE_SIZE << order;
	unsigned long addr;
	unsigned int sz;

	if (!address)
		return;

	/* Unreserve */
	for (addr = address, sz = bytes;
	     sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
		ClearPageReserved(virt_to_page(addr));
	}

	free_pages(address, order);
}

#if __OS_HAS_AGP
static void *agp_remap(unsigned long offset, unsigned long size,
			      struct drm_device * dev)
{
	unsigned long *phys_addr_map, i, num_pages =
	    PAGE_ALIGN(size) / PAGE_SIZE;
	struct drm_agp_mem *agpmem;
	struct page **page_map;
	void *addr;

	size = PAGE_ALIGN(size);

#ifdef __alpha__
	offset -= dev->hose->mem_space->start;
#endif

	list_for_each_entry(agpmem, &dev->agp->memory, head)
		if (agpmem->bound <= offset
		    && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
		    (offset + size))
			break;
	if (!agpmem)
		return NULL;

	/*
	 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
	 * the CPU do not get remapped by the GART.  We fix this by using the kernel's
	 * page-table instead (that's probably faster anyhow...).
	 */
	/* note: use vmalloc() because num_pages could be large... */
	page_map = vmalloc(num_pages * sizeof(struct page *));
	if (!page_map)
		return NULL;

	phys_addr_map =
	    agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
	for (i = 0; i < num_pages; ++i)
		page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
	addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
	vfree(page_map);

	return addr;
}

/** Wrapper around agp_allocate_memory() */
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11)
DRM_AGP_MEM *drm_alloc_agp(struct drm_device *dev, int pages, u32 type)
{
	return drm_agp_allocate_memory(pages, type);
}
#else
DRM_AGP_MEM *drm_alloc_agp(struct drm_device *dev, int pages, u32 type)
{
	return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
}
#endif

/** Wrapper around agp_free_memory() */
int drm_free_agp(DRM_AGP_MEM * handle, int pages)
{
	return drm_agp_free_memory(handle) ? 0 : -EINVAL;
}

/** Wrapper around agp_bind_memory() */
int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
{
	return drm_agp_bind_memory(handle, start);
}

/** Wrapper around agp_unbind_memory() */
int drm_unbind_agp(DRM_AGP_MEM * handle)
{
	return drm_agp_unbind_memory(handle);
}

#else  /* __OS_HAS_AGP*/
static void *agp_remap(unsigned long offset, unsigned long size,
		       struct drm_device * dev)
{
	return NULL;
}
#endif				/* agp */
#else
static void *agp_remap(unsigned long offset, unsigned long size,
		       struct drm_device * dev)
{
	return NULL;
}
#endif				/* debug_memory */

void drm_core_ioremap(struct drm_map *map, struct drm_device *dev)
{
	if (drm_core_has_AGP(dev) &&
	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
		map->handle = agp_remap(map->offset, map->size, dev);
	else
		map->handle = ioremap(map->offset, map->size);
}
EXPORT_SYMBOL_GPL(drm_core_ioremap);

void drm_core_ioremapfree(struct drm_map *map, struct drm_device *dev)
{
	if (!map->handle || !map->size)
		return;

	if (drm_core_has_AGP(dev) &&
	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
		vunmap(map->handle);
	else
		iounmap(map->handle);
}
EXPORT_SYMBOL_GPL(drm_core_ioremapfree);