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dmaengine, async_tx: support alignment checks

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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>
This commit is contained in:
Dan Williams 2009-09-08 17:42:53 -07:00
parent 9308add6ea
commit 83544ae9f3
6 changed files with 67 additions and 6 deletions
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44
include/linux/dmaengine.h
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@ -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)
{