[PATCH][20/27] IB/mthca: add mthca_table_find() function

Roland Dreier
2005-04-01T21:01:45Z

From: Michael S. Tsirkin <mst@mellanox.co.il>

Add mthca_table_find() function, which returns the lowmem address of
an entry in a mem-free HCA's context tables. This will be used by the
FMR implementation.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <roland@topspin.com>

--- linux-export.orig/drivers/infiniband/hw/mthca/mthca_memfree.c 2005-04-01 12:38:23.500859288 -0800
+++ linux-export/drivers/infiniband/hw/mthca/mthca_memfree.c 2005-04-01 12:38:28.285820606 -0800
@@ -192,6 +192,40 @@
up(&table->mutex);
}

+void *mthca_table_find(struct mthca_icm_table *table, int obj)
+{
+ int idx, offset, i;
+ struct mthca_icm_chunk *chunk;
+ struct mthca_icm *icm;
+ struct page *page = NULL;
+
+ if (!table->lowmem)
+ return NULL;
+
+ down(&table->mutex);
+
+ idx = (obj & (table->num_obj - 1)) * table->obj_size;
+ icm = table->icm[idx / MTHCA_TABLE_CHUNK_SIZE];
+ offset = idx % MTHCA_TABLE_CHUNK_SIZE;
+
+ if (!icm)
+ goto out;
+
+ list_for_each_entry(chunk, &icm->chunk_list, list) {
+ for (i = 0; i < chunk->npages; ++i) {
+ if (chunk->mem[i].length >= offset) {
+ page = chunk->mem[i].page;
+ break;
+ }
+ offset -= chunk->mem[i].length;
+ }
+ }
+
+out:
+ up(&table->mutex);
+ return page ? lowmem_page_address(page) + offset : NULL;
+}
+
int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
int start, int end)
{
--- linux-export.orig/drivers/infiniband/hw/mthca/mthca_memfree.h 2005-04-01 12:38:19.895641881 -0800
+++ linux-export/drivers/infiniband/hw/mthca/mthca_memfree.h 2005-04-01 12:38:28.280821691 -0800
@@ -85,6 +85,7 @@
void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table);
int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
+void *mthca_table_find(struct mthca_icm_table *table, int obj);
int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
int start, int end);
void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,