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

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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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Michael S. Tsirkin 2005-04-16 15:26:29 -07:00 • committed by Linus Torvalds
parent b8ca06f674
commit 0fabd9fb7b
2 changed files with 35 additions and 0 deletions
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34
drivers/infiniband/hw/mthca/mthca_memfree.c
View file

@ -192,6 +192,40 @@ void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int o
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)
{

1
drivers/infiniband/hw/mthca/mthca_memfree.h
View file

@ -85,6 +85,7 @@ struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
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,