From: akpm@osdl.org
To: torvalds@osdl.org
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org, mst@mellanox.co.il,
roland@topspin.com
Subject: [patch 182/198] IB/mthca: add mthca_table_find() function
Date: Tue, 12 Apr 2005 03:33:22 -0700 [thread overview]
Message-ID: <200504121033.j3CAXSb4005889@shell0.pdx.osdl.net> (raw)
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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/drivers/infiniband/hw/mthca/mthca_memfree.c | 34 ++++++++++++++++++++
25-akpm/drivers/infiniband/hw/mthca/mthca_memfree.h | 1
2 files changed, 35 insertions(+)
diff -puN drivers/infiniband/hw/mthca/mthca_memfree.c~ib-mthca-add-mthca_table_find-function drivers/infiniband/hw/mthca/mthca_memfree.c
--- 25/drivers/infiniband/hw/mthca/mthca_memfree.c~ib-mthca-add-mthca_table_find-function 2005-04-12 03:21:46.703036960 -0700
+++ 25-akpm/drivers/infiniband/hw/mthca/mthca_memfree.c 2005-04-12 03:21:46.707036352 -0700
@@ -192,6 +192,40 @@ void mthca_table_put(struct mthca_dev *d
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)
{
diff -puN drivers/infiniband/hw/mthca/mthca_memfree.h~ib-mthca-add-mthca_table_find-function drivers/infiniband/hw/mthca/mthca_memfree.h
--- 25/drivers/infiniband/hw/mthca/mthca_memfree.h~ib-mthca-add-mthca_table_find-function 2005-04-12 03:21:46.704036808 -0700
+++ 25-akpm/drivers/infiniband/hw/mthca/mthca_memfree.h 2005-04-12 03:21:46.708036200 -0700
@@ -85,6 +85,7 @@ struct mthca_icm_table *mthca_alloc_icm_
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,
_
reply other threads:[~2005-04-12 15:48 UTC|newest]
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