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authorDan Williams <dan.j.williams@intel.com>2009-09-08 17:42:53 -0700
committerDan Williams <dan.j.williams@intel.com>2009-09-08 17:42:53 -0700
commit83544ae9f3991bfc7d5e0fe9a3008cd05a8d57b7 (patch)
treebc4b28c2e5bdae01a2c8a250176fcdac6ae7a8ce /include/linux/dmaengine.h
parent9308add6ea4fedeba37b0d7c4630a542bd34f214 (diff)
downloadop-kernel-dev-83544ae9f3991bfc7d5e0fe9a3008cd05a8d57b7.zip
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dmaengine, async_tx: support alignment checks
Some engines have transfer size and address alignment restrictions. Add a per-operation alignment property to struct dma_device that the async routines and dmatest can use to check alignment capabilities. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/dmaengine.h')
-rw-r--r--include/linux/dmaengine.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index db23fd5..835b9c7 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -245,6 +245,10 @@ struct dma_async_tx_descriptor {
* @cap_mask: one or more dma_capability flags
* @max_xor: maximum number of xor sources, 0 if no capability
* @max_pq: maximum number of PQ sources and PQ-continue capability
+ * @copy_align: alignment shift for memcpy operations
+ * @xor_align: alignment shift for xor operations
+ * @pq_align: alignment shift for pq operations
+ * @fill_align: alignment shift for memset operations
* @dev_id: unique device ID
* @dev: struct device reference for dma mapping api
* @device_alloc_chan_resources: allocate resources and return the
@@ -271,6 +275,10 @@ struct dma_device {
dma_cap_mask_t cap_mask;
unsigned short max_xor;
unsigned short max_pq;
+ u8 copy_align;
+ u8 xor_align;
+ u8 pq_align;
+ u8 fill_align;
#define DMA_HAS_PQ_CONTINUE (1 << 15)
int dev_id;
@@ -314,6 +322,42 @@ struct dma_device {
void (*device_issue_pending)(struct dma_chan *chan);
};
+static inline bool dmaengine_check_align(u8 align, size_t off1, size_t off2, size_t len)
+{
+ size_t mask;
+
+ if (!align)
+ return true;
+ mask = (1 << align) - 1;
+ if (mask & (off1 | off2 | len))
+ return false;
+ return true;
+}
+
+static inline bool is_dma_copy_aligned(struct dma_device *dev, size_t off1,
+ size_t off2, size_t len)
+{
+ return dmaengine_check_align(dev->copy_align, off1, off2, len);
+}
+
+static inline bool is_dma_xor_aligned(struct dma_device *dev, size_t off1,
+ size_t off2, size_t len)
+{
+ return dmaengine_check_align(dev->xor_align, off1, off2, len);
+}
+
+static inline bool is_dma_pq_aligned(struct dma_device *dev, size_t off1,
+ size_t off2, size_t len)
+{
+ return dmaengine_check_align(dev->pq_align, off1, off2, len);
+}
+
+static inline bool is_dma_fill_aligned(struct dma_device *dev, size_t off1,
+ size_t off2, size_t len)
+{
+ return dmaengine_check_align(dev->fill_align, off1, off2, len);
+}
+
static inline void
dma_set_maxpq(struct dma_device *dma, int maxpq, int has_pq_continue)
{
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