--- /dev/null
+/*
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff