Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 0fabd9fb authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by Linus Torvalds
Browse files

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



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: default avatarMichael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: default avatarRoland Dreier <roland@topspin.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent b8ca06f6

drivers/infiniband/hw/mthca/mthca_memfree.c

+34 −0
Original line number Diff line number Diff line
@@ -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)

{

drivers/infiniband/hw/mthca/mthca_memfree.h

+1 −0
Original line number Diff line number Diff line
@@ -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,