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IB/ehca: Fall back to vmalloc() for big allocations

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In case of large queue pairs there is the possibillity of allocation
failures due to memory fragmentation when using kmalloc().  To ensure
the memory is allocated even if kmalloc() can not find chunks which
are big enough, we fall back to allocating the memory with vmalloc().

Signed-off-by: Stefan Roscher <stefan.roscher@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Stefan Roscher 2009-05-13 16:52:42 -07:00 committed by Roland Dreier
parent bf31a1a02e
commit c94f156f63
1 changed files with 13 additions and 4 deletions
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17
drivers/infiniband/hw/ehca/ipz_pt_fn.c
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@ -222,8 +222,11 @@ int ipz_queue_ctor(struct ehca_pd *pd, struct ipz_queue *queue,
/* allocate queue page pointers */
queue->queue_pages = kmalloc(nr_of_pages * sizeof(void *), GFP_KERNEL);
if (!queue->queue_pages) {
ehca_gen_err("Couldn't allocate queue page list");
return 0;
queue->queue_pages = vmalloc(nr_of_pages * sizeof(void *));
if (!queue->queue_pages) {
ehca_gen_err("Couldn't allocate queue page list");
return 0;
}
}
memset(queue->queue_pages, 0, nr_of_pages * sizeof(void *));
@ -240,7 +243,10 @@ int ipz_queue_ctor(struct ehca_pd *pd, struct ipz_queue *queue,
ipz_queue_ctor_exit0:
ehca_gen_err("Couldn't alloc pages queue=%p "
"nr_of_pages=%x", queue, nr_of_pages);
kfree(queue->queue_pages);
if (is_vmalloc_addr(queue->queue_pages))
vfree(queue->queue_pages);
else
kfree(queue->queue_pages);
return 0;
}
@ -262,7 +268,10 @@ int ipz_queue_dtor(struct ehca_pd *pd, struct ipz_queue *queue)
free_page((unsigned long)queue->queue_pages[i]);
}
kfree(queue->queue_pages);
if (is_vmalloc_addr(queue->queue_pages))
vfree(queue->queue_pages);
else
kfree(queue->queue_pages);
return 1;
}