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authorDan Williams <dan.j.williams@intel.com>2009-09-08 12:02:01 -0700
committerDan Williams <dan.j.williams@intel.com>2009-09-08 17:38:54 -0700
commita309218acee8606f7e235da20cc826eb06d9b0f6 (patch)
treeabf2cc9830b6a5a52a165e6a736e85cd5d7b36c0 /drivers/dma/ioat/dma_v2.h
parent09c8a5b85e5f1e74a19bdd7c85547429d51df1cd (diff)
ioat2,3: dynamically resize descriptor ring
Increment the allocation order of the descriptor ring every time we run out of descriptors up to a maximum of allocation order specified by the module parameter 'ioat_max_alloc_order'. After each idle period decrement the allocation order to a minimum order of 'ioat_ring_alloc_order' (i.e. the default ring size, tunable as a module parameter). Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/ioat/dma_v2.h')
-rw-r--r--drivers/dma/ioat/dma_v2.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h
index 73b04a2eb4b..9baa3d6065f 100644
--- a/drivers/dma/ioat/dma_v2.h
+++ b/drivers/dma/ioat/dma_v2.h
@@ -37,6 +37,8 @@ extern int ioat_pending_level;
#define IOAT_MAX_ORDER 16
#define ioat_get_alloc_order() \
(min(ioat_ring_alloc_order, IOAT_MAX_ORDER))
+#define ioat_get_max_alloc_order() \
+ (min(ioat_ring_max_alloc_order, IOAT_MAX_ORDER))
/* struct ioat2_dma_chan - ioat v2 / v3 channel attributes
* @base: common ioat channel parameters