This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / drivers / infiniband / hw / mthca / mthca_memfree.h

diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.h b/drivers/infiniband/hw/mthca/mthca_memfree.h
new file mode 100644 (file)
index 0000000..b63ae66
--- /dev/null
+++ b/drivers/infiniband/hw/mthca/mthca_memfree.h
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2004, 2005 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.
+ *
+ * $Id$
+ */
+
+#ifndef MTHCA_MEMFREE_H
+#define MTHCA_MEMFREE_H
+
+#include <linux/list.h>
+#include <linux/pci.h>
+
+#include <asm/semaphore.h>
+
+#define MTHCA_ICM_CHUNK_LEN \
+       ((256 - sizeof (struct list_head) - 2 * sizeof (int)) /         \
+        (sizeof (struct scatterlist)))
+
+struct mthca_icm_chunk {
+       struct list_head   list;
+       int                npages;
+       int                nsg;
+       struct scatterlist mem[MTHCA_ICM_CHUNK_LEN];
+};
+
+struct mthca_icm {
+       struct list_head chunk_list;
+};
+
+struct mthca_icm_table {
+       u64               virt;
+       int               num_icm;
+       struct semaphore  sem;
+       struct mthca_icm *icm[0];
+};
+
+struct mthca_icm_iter {
+       struct mthca_icm       *icm;
+       struct mthca_icm_chunk *chunk;
+       int                     page_idx;
+};
+
+struct mthca_dev;
+
+struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
+                                 unsigned int gfp_mask);
+void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm);
+
+struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
+                                             u64 virt, unsigned size,
+                                             unsigned reserved,
+                                             int use_lowmem);
+void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table);
+
+static inline void mthca_icm_first(struct mthca_icm *icm,
+                                  struct mthca_icm_iter *iter)
+{
+       iter->icm      = icm;
+       iter->chunk    = list_empty(&icm->chunk_list) ?
+               NULL : list_entry(icm->chunk_list.next,
+                                 struct mthca_icm_chunk, list);
+       iter->page_idx = 0;
+}
+
+static inline int mthca_icm_last(struct mthca_icm_iter *iter)
+{
+       return !iter->chunk;
+}
+
+static inline void mthca_icm_next(struct mthca_icm_iter *iter)
+{
+       if (++iter->page_idx >= iter->chunk->nsg) {
+               if (iter->chunk->list.next == &iter->icm->chunk_list) {
+                       iter->chunk = NULL;
+                       return;
+               }
+
+               iter->chunk = list_entry(iter->chunk->list.next,
+                                        struct mthca_icm_chunk, list);
+               iter->page_idx = 0;
+       }
+}
+
+static inline dma_addr_t mthca_icm_addr(struct mthca_icm_iter *iter)
+{
+       return sg_dma_address(&iter->chunk->mem[iter->page_idx]);
+}
+
+static inline unsigned long mthca_icm_size(struct mthca_icm_iter *iter)
+{
+       return sg_dma_len(&iter->chunk->mem[iter->page_idx]);
+}
+
+#endif /* MTHCA_MEMFREE_H */