- 根目录:
- drivers
- scsi
- sym53c8xx_2
- sym_malloc.c
/*
* 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 developed 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;
}