summaryrefslogtreecommitdiffstats
path: root/arch/m68k/sun3/sun3dvma.c
blob: 8be8b750c6293d8857b43dcdb9a61cf76950f6cf (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
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
// SPDX-License-Identifier: GPL-2.0
/*
 * linux/arch/m68k/sun3/sun3dvma.c
 *
 * Copyright (C) 2000 Sam Creasey
 *
 * Contains common routines for sun3/sun3x DVMA management.
 */

#include <linux/memblock.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/list.h>

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/dvma.h>

#undef DVMA_DEBUG

#ifdef CONFIG_SUN3X
extern void dvma_unmap_iommu(unsigned long baddr, int len);
#else
static inline void dvma_unmap_iommu(unsigned long a, int b)
{
}
#endif

#ifdef CONFIG_SUN3
extern void sun3_dvma_init(void);
#endif

static unsigned long *iommu_use;

#define dvma_index(baddr) ((baddr - DVMA_START) >> DVMA_PAGE_SHIFT)

#define dvma_entry_use(baddr)		(iommu_use[dvma_index(baddr)])

struct hole {
	unsigned long start;
	unsigned long end;
	unsigned long size;
	struct list_head list;
};

static struct list_head hole_list;
static struct list_head hole_cache;
static struct hole initholes[64];

#ifdef DVMA_DEBUG

static unsigned long dvma_allocs;
static unsigned long dvma_frees;
static unsigned long long dvma_alloc_bytes;
static unsigned long long dvma_free_bytes;

static void print_use(void)
{

	int i;
	int j = 0;

	pr_info("dvma entry usage:\n");

	for(i = 0; i < IOMMU_TOTAL_ENTRIES; i++) {
		if(!iommu_use[i])
			continue;

		j++;

		pr_info("dvma entry: %08x len %08lx\n",
			(i << DVMA_PAGE_SHIFT) + DVMA_START, iommu_use[i]);
	}

	pr_info("%d entries in use total\n", j);

	pr_info("allocation/free calls: %lu/%lu\n", dvma_allocs, dvma_frees);
	pr_info("allocation/free bytes: %Lx/%Lx\n", dvma_alloc_bytes,
		dvma_free_bytes);
}

static void print_holes(struct list_head *holes)
{

	struct list_head *cur;
	struct hole *hole;

	pr_info("listing dvma holes\n");
	list_for_each(cur, holes) {
		hole = list_entry(cur, struct hole, list);

		if((hole->start == 0) && (hole->end == 0) && (hole->size == 0))
			continue;

		pr_info("hole: start %08lx end %08lx size %08lx\n",
			hole->start, hole->end, hole->size);
	}

	pr_info("end of hole listing...\n");
}
#endif /* DVMA_DEBUG */

static inline int refill(void)
{

	struct hole *hole;
	struct hole *prev = NULL;
	struct list_head *cur;
	int ret = 0;

	list_for_each(cur, &hole_list) {
		hole = list_entry(cur, struct hole, list);

		if(!prev) {
			prev = hole;
			continue;
		}

		if(hole->end == prev->start) {
			hole->size += prev->size;
			hole->end = prev->end;
			list_move(&(prev->list), &hole_cache);
			ret++;
		}

	}

	return ret;
}

static inline struct hole *rmcache(void)
{
	struct hole *ret;

	if(list_empty(&hole_cache)) {
		if(!refill()) {
			pr_crit("out of dvma hole cache!\n");
			BUG();
		}
	}

	ret = list_entry(hole_cache.next, struct hole, list);
	list_del(&(ret->list));

	return ret;

}

static inline unsigned long get_baddr(int len, unsigned long align)
{

	struct list_head *cur;
	struct hole *hole;

	if(list_empty(&hole_list)) {
#ifdef DVMA_DEBUG
		pr_crit("out of dvma holes! (printing hole cache)\n");
		print_holes(&hole_cache);
		print_use();
#endif
		BUG();
	}

	list_for_each(cur, &hole_list) {
		unsigned long newlen;

		hole = list_entry(cur, struct hole, list);

		if(align > DVMA_PAGE_SIZE)
			newlen = len + ((hole->end - len) & (align-1));
		else
			newlen = len;

		if(hole->size > newlen) {
			hole->end -= newlen;
			hole->size -= newlen;
			dvma_entry_use(hole->end) = newlen;
#ifdef DVMA_DEBUG
			dvma_allocs++;
			dvma_alloc_bytes += newlen;
#endif
			return hole->end;
		} else if(hole->size == newlen) {
			list_move(&(hole->list), &hole_cache);
			dvma_entry_use(hole->start) = newlen;
#ifdef DVMA_DEBUG
			dvma_allocs++;
			dvma_alloc_bytes += newlen;
#endif
			return hole->start;
		}

	}

	pr_crit("unable to find dvma hole!\n");
	BUG();
	return 0;
}

static inline int free_baddr(unsigned long baddr)
{

	unsigned long len;
	struct hole *hole;
	struct list_head *cur;
	unsigned long orig_baddr;

	orig_baddr = baddr;
	len = dvma_entry_use(baddr);
	dvma_entry_use(baddr) = 0;
	baddr &= DVMA_PAGE_MASK;
	dvma_unmap_iommu(baddr, len);

#ifdef DVMA_DEBUG
	dvma_frees++;
	dvma_free_bytes += len;
#endif

	list_for_each(cur, &hole_list) {
		hole = list_entry(cur, struct hole, list);

		if(hole->end == baddr) {
			hole->end += len;
			hole->size += len;
			return 0;
		} else if(hole->start == (baddr + len)) {
			hole->start = baddr;
			hole->size += len;
			return 0;
		}

	}

	hole = rmcache();

	hole->start = baddr;
	hole->end = baddr + len;
	hole->size = len;

//	list_add_tail(&(hole->list), cur);
	list_add(&(hole->list), cur);

	return 0;

}

void __init dvma_init(void)
{

	struct hole *hole;
	int i;

	INIT_LIST_HEAD(&hole_list);
	INIT_LIST_HEAD(&hole_cache);

	/* prepare the hole cache */
	for(i = 0; i < 64; i++)
		list_add(&(initholes[i].list), &hole_cache);

	hole = rmcache();
	hole->start = DVMA_START;
	hole->end = DVMA_END;
	hole->size = DVMA_SIZE;

	list_add(&(hole->list), &hole_list);

	iommu_use = memblock_alloc(IOMMU_TOTAL_ENTRIES * sizeof(unsigned long),
				   0);

	dvma_unmap_iommu(DVMA_START, DVMA_SIZE);

#ifdef CONFIG_SUN3
	sun3_dvma_init();
#endif

}

unsigned long dvma_map_align(unsigned long kaddr, int len, int align)
{

	unsigned long baddr;
	unsigned long off;

	if(!len)
		len = 0x800;

	if(!kaddr || !len) {
//		pr_err("error: kaddr %lx len %x\n", kaddr, len);
//		*(int *)4 = 0;
		return 0;
	}

	pr_debug("dvma_map request %08x bytes from %08lx\n", len, kaddr);
	off = kaddr & ~DVMA_PAGE_MASK;
	kaddr &= PAGE_MASK;
	len += off;
	len = ((len + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);

	if(align == 0)
		align = DVMA_PAGE_SIZE;
	else
		align = ((align + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);

	baddr = get_baddr(len, align);
//	pr_info("using baddr %lx\n", baddr);

	if(!dvma_map_iommu(kaddr, baddr, len))
		return (baddr + off);

	pr_crit("dvma_map failed kaddr %lx baddr %lx len %x\n", kaddr, baddr,
	len);
	BUG();
	return 0;
}
EXPORT_SYMBOL(dvma_map_align);

void dvma_unmap(void *baddr)
{
	unsigned long addr;

	addr = (unsigned long)baddr;
	/* check if this is a vme mapping */
	if(!(addr & 0x00f00000))
		addr |= 0xf00000;

	free_baddr(addr);

	return;

}
EXPORT_SYMBOL(dvma_unmap);

void *dvma_malloc_align(unsigned long len, unsigned long align)
{
	unsigned long kaddr;
	unsigned long baddr;
	unsigned long vaddr;

	if(!len)
		return NULL;

	pr_debug("dvma_malloc request %lx bytes\n", len);
	len = ((len + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);

        if((kaddr = __get_free_pages(GFP_ATOMIC, get_order(len))) == 0)
		return NULL;

	if((baddr = (unsigned long)dvma_map_align(kaddr, len, align)) == 0) {
		free_pages(kaddr, get_order(len));
		return NULL;
	}

	vaddr = dvma_btov(baddr);

	if(dvma_map_cpu(kaddr, vaddr, len) < 0) {
		dvma_unmap((void *)baddr);
		free_pages(kaddr, get_order(len));
		return NULL;
	}

	pr_debug("mapped %08lx bytes %08lx kern -> %08lx bus\n", len, kaddr,
		 baddr);

	return (void *)vaddr;

}
EXPORT_SYMBOL(dvma_malloc_align);

void dvma_free(void *vaddr)
{

	return;

}
EXPORT_SYMBOL(dvma_free);