aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/scsi/sym53c8xx_2/sym_malloc.c
blob: 92bf9b14a7a2bb98fdd0cc772d7496f86dc77637 (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
/*
 * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family 
 * of PCI-SCSI IO processors.
 *
 * Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>
 *
 * This driver is derived from the Linux sym53c8xx driver.
 * Copyright (C) 1998-2000  Gerard Roudier
 *
 * The sym53c8xx driver is derived from the ncr53c8xx driver that had been 
 * a port of the FreeBSD ncr driver to Linux-1.2.13.
 *
 * The original ncr driver has been written for 386bsd and FreeBSD by
 *         Wolfgang Stanglmeier        <wolf@cologne.de>
 *         Stefan Esser                <se@mi.Uni-Koeln.de>
 * Copyright (C) 1994  Wolfgang Stanglmeier
 *
 * Other major contributions:
 *
 * NVRAM detection and reading.
 * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
 *
 *-----------------------------------------------------------------------------
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "sym_glue.h"

/*
 *  Simple power of two buddy-like generic allocator.
 *  Provides naturally aligned memory chunks.
 *
 *  This simple code is not intended to be fast, but to 
 *  provide power of 2 aligned memory allocations.
 *  Since the SCRIPTS processor only supplies 8 bit arithmetic, 
 *  this allocator allows simple and fast address calculations  
 *  from the SCRIPTS code. In addition, cache line alignment 
 *  is guaranteed for power of 2 cache line size.
 *
 *  This allocator has been developped for the Linux sym53c8xx  
 *  driver, since this O/S does not provide naturally aligned 
 *  allocations.
 *  It has the advantage of allowing the driver to use private 
 *  pages of memory that will be useful if we ever need to deal 
 *  with IO MMUs for PCI.
 */
static void *___sym_malloc(m_pool_p mp, int size)
{
	int i = 0;
	int s = (1 << SYM_MEM_SHIFT);
	int j;
	void *a;
	m_link_p h = mp->h;

	if (size > SYM_MEM_CLUSTER_SIZE)
		return NULL;

	while (size > s) {
		s <<= 1;
		++i;
	}

	j = i;
	while (!h[j].next) {
		if (s == SYM_MEM_CLUSTER_SIZE) {
			h[j].next = (m_link_p) M_GET_MEM_CLUSTER();
			if (h[j].next)
				h[j].next->next = NULL;
			break;
		}
		++j;
		s <<= 1;
	}
	a = h[j].next;
	if (a) {
		h[j].next = h[j].next->next;
		while (j > i) {
			j -= 1;
			s >>= 1;
			h[j].next = (m_link_p) (a+s);
			h[j].next->next = NULL;
		}
	}
#ifdef DEBUG
	printf("___sym_malloc(%d) = %p\n", size, (void *) a);
#endif
	return a;
}

/*
 *  Counter-part of the generic allocator.
 */
static void ___sym_mfree(m_pool_p mp, void *ptr, int size)
{
	int i = 0;
	int s = (1 << SYM_MEM_SHIFT);
	m_link_p q;
	unsigned long a, b;
	m_link_p h = mp->h;

#ifdef DEBUG
	printf("___sym_mfree(%p, %d)\n", ptr, size);
#endif

	if (size > SYM_MEM_CLUSTER_SIZE)
		return;

	while (size > s) {
		s <<= 1;
		++i;
	}

	a = (unsigned long)ptr;

	while (1) {
		if (s == SYM_MEM_CLUSTER_SIZE) {
#ifdef SYM_MEM_FREE_UNUSED
			M_FREE_MEM_CLUSTER((void *)a);
#else
			((m_link_p) a)->next = h[i].next;
			h[i].next = (m_link_p) a;
#endif
			break;
		}
		b = a ^ s;
		q = &h[i];
		while (q->next && q->next != (m_link_p) b) {
			q = q->next;
		}
		if (!q->next) {
			((m_link_p) a)->next = h[i].next;
			h[i].next = (m_link_p) a;
			break;
		}
		q->next = q->next->next;
		a = a & b;
		s <<= 1;
		++i;
	}
}

/*
 *  Verbose and zeroing allocator that wrapps to the generic allocator.
 */
static void *__sym_calloc2(m_pool_p mp, int size, char *name, int uflags)
{
	void *p;

	p = ___sym_malloc(mp, size);

	if (DEBUG_FLAGS & DEBUG_ALLOC) {
		printf ("new %-10s[%4d] @%p.\n", name, size, p);
	}

	if (p)
		memset(p, 0, size);
	else if (uflags & SYM_MEM_WARN)
		printf ("__sym_calloc2: failed to allocate %s[%d]\n", name, size);
	return p;
}
#define __sym_calloc(mp, s, n)	__sym_calloc2(mp, s, n, SYM_MEM_WARN)

/*
 *  Its counter-part.
 */
static void __sym_mfree(m_pool_p mp, void *ptr, int size, char *name)
{
	if (DEBUG_FLAGS & DEBUG_ALLOC)
		printf ("freeing %-10s[%4d] @%p.\n", name, size, ptr);

	___sym_mfree(mp, ptr, size);
}

/*
 *  Default memory pool we donnot need to involve in DMA.
 *
 *  With DMA abstraction, we use functions (methods), to 
 *  distinguish between non DMAable memory and DMAable memory.
 */
static void *___mp0_get_mem_cluster(m_pool_p mp)
{
	void *m = sym_get_mem_cluster();
	if (m)
		++mp->nump;
	return m;
}

#ifdef	SYM_MEM_FREE_UNUSED
static void ___mp0_free_mem_cluster(m_pool_p mp, void *m)
{
	sym_free_mem_cluster(m);
	--mp->nump;
}
#else
#define ___mp0_free_mem_cluster NULL
#endif

static struct sym_m_pool mp0 = {
	NULL,
	___mp0_get_mem_cluster,
	___mp0_free_mem_cluster
};

/*
 *  Methods that maintains DMAable pools according to user allocations.
 *  New pools are created on the fly when a new pool id is provided.
 *  They are deleted on the fly when they get emptied.
 */
/* Get a memory cluster that matches the DMA constraints of a given pool */
static void * ___get_dma_mem_cluster(m_pool_p mp)
{
	m_vtob_p vbp;
	void *vaddr;

	vbp = __sym_calloc(&mp0, sizeof(*vbp), "VTOB");
	if (!vbp)
		goto out_err;

	vaddr = sym_m_get_dma_mem_cluster(mp, vbp);
	if (vaddr) {
		int hc = VTOB_HASH_CODE(vaddr);
		vbp->next = mp->vtob[hc];
		mp->vtob[hc] = vbp;
		++mp->nump;
	}
	return vaddr;
out_err:
	return NULL;
}

#ifdef	SYM_MEM_FREE_UNUSED
/* Free a memory cluster and associated resources for DMA */
static void ___free_dma_mem_cluster(m_pool_p mp, void *m)
{
	m_vtob_p *vbpp, vbp;
	int hc = VTOB_HASH_CODE(m);

	vbpp = &mp->vtob[hc];
	while (*vbpp && (*vbpp)->vaddr != m)
		vbpp = &(*vbpp)->next;
	if (*vbpp) {
		vbp = *vbpp;
		*vbpp = (*vbpp)->next;
		sym_m_free_dma_mem_cluster(mp, vbp);
		__sym_mfree(&mp0, vbp, sizeof(*vbp), "VTOB");
		--mp->nump;
	}
}
#endif

/* Fetch the memory pool for a given pool id (i.e. DMA constraints) */
static __inline m_pool_p ___get_dma_pool(m_pool_ident_t dev_dmat)
{
	m_pool_p mp;
	for (mp = mp0.next;
		mp && !sym_m_pool_match(mp->dev_dmat, dev_dmat);
			mp = mp->next);
	return mp;
}

/* Create a new memory DMAable pool (when fetch failed) */
static m_pool_p ___cre_dma_pool(m_pool_ident_t dev_dmat)
{
	m_pool_p mp = __sym_calloc(&mp0, sizeof(*mp), "MPOOL");
	if (mp) {
		mp->dev_dmat = dev_dmat;
		mp->get_mem_cluster = ___get_dma_mem_cluster;
#ifdef	SYM_MEM_FREE_UNUSED
		mp->free_mem_cluster = ___free_dma_mem_cluster;
#endif
		mp->next = mp0.next;
		mp0.next = mp;
		return mp;
	}
	return NULL;
}

#ifdef	SYM_MEM_FREE_UNUSED
/* Destroy a DMAable memory pool (when got emptied) */
static void ___del_dma_pool(m_pool_p p)
{
	m_pool_p *pp = &mp0.next;

	while (*pp && *pp != p)
		pp = &(*pp)->next;
	if (*pp) {
		*pp = (*pp)->next;
		__sym_mfree(&mp0, p, sizeof(*p), "MPOOL");
	}
}
#endif

/* This lock protects only the memory allocation/free.  */
static DEFINE_SPINLOCK(sym53c8xx_lock);

/*
 *  Actual allocator for DMAable memory.
 */
void *__sym_calloc_dma(m_pool_ident_t dev_dmat, int size, char *name)
{
	unsigned long flags;
	m_pool_p mp;
	void *m = NULL;

	spin_lock_irqsave(&sym53c8xx_lock, flags);
	mp = ___get_dma_pool(dev_dmat);
	if (!mp)
		mp = ___cre_dma_pool(dev_dmat);
	if (!mp)
		goto out;
	m = __sym_calloc(mp, size, name);
#ifdef	SYM_MEM_FREE_UNUSED
	if (!mp->nump)
		___del_dma_pool(mp);
#endif

 out:
	spin_unlock_irqrestore(&sym53c8xx_lock, flags);
	return m;
}

void __sym_mfree_dma(m_pool_ident_t dev_dmat, void *m, int size, char *name)
{
	unsigned long flags;
	m_pool_p mp;

	spin_lock_irqsave(&sym53c8xx_lock, flags);
	mp = ___get_dma_pool(dev_dmat);
	if (!mp)
		goto out;
	__sym_mfree(mp, m, size, name);
#ifdef	SYM_MEM_FREE_UNUSED
	if (!mp->nump)
		___del_dma_pool(mp);
#endif
 out:
	spin_unlock_irqrestore(&sym53c8xx_lock, flags);
}

/*
 *  Actual virtual to bus physical address translator 
 *  for 32 bit addressable DMAable memory.
 */
dma_addr_t __vtobus(m_pool_ident_t dev_dmat, void *m)
{
	unsigned long flags;
	m_pool_p mp;
	int hc = VTOB_HASH_CODE(m);
	m_vtob_p vp = NULL;
	void *a = (void *)((unsigned long)m & ~SYM_MEM_CLUSTER_MASK);
	dma_addr_t b;

	spin_lock_irqsave(&sym53c8xx_lock, flags);
	mp = ___get_dma_pool(dev_dmat);
	if (mp) {
		vp = mp->vtob[hc];
		while (vp && vp->vaddr != a)
			vp = vp->next;
	}
	if (!vp)
		panic("sym: VTOBUS FAILED!\n");
	b = vp->baddr + (m - a);
	spin_unlock_irqrestore(&sym53c8xx_lock, flags);
	return b;
}