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[PATCH] IB/mthca: Handle context tables smaller than our chunk size

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When creating a table in context memory where the table is smaller
than our chunk size, we don't want to allocate and map a full chunk.
Instead, allocate just enough memory to cover the table.

This can be pretty simple because all tables are a power-of-2 size, so
either the table is a multiple of the chunk size, or it's smaller than
one chunk.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier
2005-08-19 10:36:11 -07:00
committed by Roland Dreier
parent c04bc3d1f4
commit d20a401928
1 changed files with 6 additions and 1 deletions
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7
drivers/infiniband/hw/mthca/mthca_memfree.c
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@@ -286,6 +286,7 @@ struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
{ {
struct mthca_icm_table *table; struct mthca_icm_table *table;
int num_icm; int num_icm;
unsigned chunk_size;
int i; int i;
u8 status; u8 status;
@@ -306,7 +307,11 @@ struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
table->icm[i] = NULL; table->icm[i] = NULL;
for (i = 0; i * MTHCA_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) { for (i = 0; i * MTHCA_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT, chunk_size = MTHCA_TABLE_CHUNK_SIZE;
if ((i + 1) * MTHCA_TABLE_CHUNK_SIZE > nobj * obj_size)
chunk_size = nobj * obj_size - i * MTHCA_TABLE_CHUNK_SIZE;
table->icm[i] = mthca_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
(use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) | (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
__GFP_NOWARN); __GFP_NOWARN);
if (!table->icm[i]) if (!table->icm[i])