Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 179 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_allocator.c b/drivers/infiniband/hw/mthca/mthca_allocator.c
new file mode 100644
index 000000000000..b1db48dd91d6
--- /dev/null
+++ b/drivers/infiniband/hw/mthca/mthca_allocator.c
@@ -0,0 +1,179 @@
+/*
+ * Copyright (c) 2004 Topspin Communications.  All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * 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 THE AUTHORS OR COPYRIGHT HOLDERS
+ * 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.
+ *
+ * $Id: mthca_allocator.c 1349 2004-12-16 21:09:43Z roland $
+ */
+
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/bitmap.h>
+
+#include "mthca_dev.h"
+
+/* Trivial bitmap-based allocator */
+u32 mthca_alloc(struct mthca_alloc *alloc)
+{
+        u32 obj;
+
+        spin_lock(&alloc->lock);
+        obj = find_next_zero_bit(alloc->table, alloc->max, alloc->last);
+        if (obj >= alloc->max) {
+                alloc->top = (alloc->top + alloc->max) & alloc->mask;
+                obj = find_first_zero_bit(alloc->table, alloc->max);
+        }
+
+        if (obj < alloc->max) {
+                set_bit(obj, alloc->table);
+                obj |= alloc->top;
+        } else
+                obj = -1;
+
+        spin_unlock(&alloc->lock);
+
+        return obj;
+}
+
+void mthca_free(struct mthca_alloc *alloc, u32 obj)
+{
+        obj &= alloc->max - 1;
+        spin_lock(&alloc->lock);
+        clear_bit(obj, alloc->table);
+        alloc->last = min(alloc->last, obj);
+        alloc->top = (alloc->top + alloc->max) & alloc->mask;
+        spin_unlock(&alloc->lock);
+}
+
+int mthca_alloc_init(struct mthca_alloc *alloc, u32 num, u32 mask,
+                     u32 reserved)
+{
+        int i;
+
+        /* num must be a power of 2 */
+        if (num != 1 << (ffs(num) - 1))
+                return -EINVAL;
+
+        alloc->last = 0;
+        alloc->top  = 0;
+        alloc->max  = num;
+        alloc->mask = mask;
+        spin_lock_init(&alloc->lock);
+        alloc->table = kmalloc(BITS_TO_LONGS(num) * sizeof (long),
+                               GFP_KERNEL);
+        if (!alloc->table)
+                return -ENOMEM;
+
+        bitmap_zero(alloc->table, num);
+        for (i = 0; i < reserved; ++i)
+                set_bit(i, alloc->table);
+
+        return 0;
+}
+
+void mthca_alloc_cleanup(struct mthca_alloc *alloc)
+{
+        kfree(alloc->table);
+}
+
+/*
+ * Array of pointers with lazy allocation of leaf pages.  Callers of
+ * _get, _set and _clear methods must use a lock or otherwise
+ * serialize access to the array.
+ */
+
+void *mthca_array_get(struct mthca_array *array, int index)
+{
+        int p = (index * sizeof (void *)) >> PAGE_SHIFT;
+
+        if (array->page_list[p].page) {
+                int i = index & (PAGE_SIZE / sizeof (void *) - 1);
+                return array->page_list[p].page[i];
+        } else
+                return NULL;
+}
+
+int mthca_array_set(struct mthca_array *array, int index, void *value)
+{
+        int p = (index * sizeof (void *)) >> PAGE_SHIFT;
+
+        /* Allocate with GFP_ATOMIC because we'll be called with locks held. */
+        if (!array->page_list[p].page)
+                array->page_list[p].page = (void **) get_zeroed_page(GFP_ATOMIC);
+
+        if (!array->page_list[p].page)
+                return -ENOMEM;
+
+        array->page_list[p].page[index & (PAGE_SIZE / sizeof (void *) - 1)] =
+                value;
+        ++array->page_list[p].used;
+
+        return 0;
+}
+
+void mthca_array_clear(struct mthca_array *array, int index)
+{
+        int p = (index * sizeof (void *)) >> PAGE_SHIFT;
+
+        if (--array->page_list[p].used == 0) {
+                free_page((unsigned long) array->page_list[p].page);
+                array->page_list[p].page = NULL;
+        }
+
+        if (array->page_list[p].used < 0)
+                pr_debug("Array %p index %d page %d with ref count %d < 0\n",
+                         array, index, p, array->page_list[p].used);
+}
+
+int mthca_array_init(struct mthca_array *array, int nent)
+{
+        int npage = (nent * sizeof (void *) + PAGE_SIZE - 1) / PAGE_SIZE;
+        int i;
+
+        array->page_list = kmalloc(npage * sizeof *array->page_list, GFP_KERNEL);
+        if (!array->page_list)
+                return -ENOMEM;
+
+        for (i = 0; i < npage; ++i) {
+                array->page_list[i].page = NULL;
+                array->page_list[i].used = 0;
+        }
+
+        return 0;
+}
+
+void mthca_array_cleanup(struct mthca_array *array, int nent)
+{
+        int i;
+
+        for (i = 0; i < (nent * sizeof (void *) + PAGE_SIZE - 1) / PAGE_SIZE; ++i)
+                free_page((unsigned long) array->page_list[i].page);
+
+        kfree(array->page_list);
+}