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authorDan Williams <dan.j.williams@intel.com>2009-08-29 19:09:26 -0700
committerDan Williams <dan.j.williams@intel.com>2009-08-29 19:09:26 -0700
commitad283ea4a3ce82cda2efe33163748a397b31b1eb (patch)
tree11cd739195f336895abe9e4a62d824e49a41c24f /include/linux
parentd6f38f31f3ad4b0dd33fe970988f14e7c65ef702 (diff)
async_tx: add sum check flags
Replace the flat zero_sum_result with a collection of flags to contain the P (xor) zero-sum result, and the soon to be utilized Q (raid6 reed solomon syndrome) zero-sum result. Use the SUM_CHECK_ namespace instead of DMA_ since these flags will be used on non-dma-zero-sum enabled platforms. Reviewed-by: Andre Noll <maan@systemlinux.org> Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/async_tx.h2
-rw-r--r--include/linux/dmaengine.h21
2 files changed, 21 insertions, 2 deletions
diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h
index 00cfb637ddf2..3d21a2517518 100644
--- a/include/linux/async_tx.h
+++ b/include/linux/async_tx.h
@@ -148,7 +148,7 @@ async_xor(struct page *dest, struct page **src_list, unsigned int offset,
struct dma_async_tx_descriptor *
async_xor_val(struct page *dest, struct page **src_list, unsigned int offset,
- int src_cnt, size_t len, u32 *result,
+ int src_cnt, size_t len, enum sum_check_flags *result,
struct async_submit_ctl *submit);
struct dma_async_tx_descriptor *
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 6768727d00d7..02447afcebad 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -87,6 +87,25 @@ enum dma_ctrl_flags {
};
/**
+ * enum sum_check_bits - bit position of pq_check_flags
+ */
+enum sum_check_bits {
+ SUM_CHECK_P = 0,
+ SUM_CHECK_Q = 1,
+};
+
+/**
+ * enum pq_check_flags - result of async_{xor,pq}_zero_sum operations
+ * @SUM_CHECK_P_RESULT - 1 if xor zero sum error, 0 otherwise
+ * @SUM_CHECK_Q_RESULT - 1 if reed-solomon zero sum error, 0 otherwise
+ */
+enum sum_check_flags {
+ SUM_CHECK_P_RESULT = (1 << SUM_CHECK_P),
+ SUM_CHECK_Q_RESULT = (1 << SUM_CHECK_Q),
+};
+
+
+/**
* dma_cap_mask_t - capabilities bitmap modeled after cpumask_t.
* See linux/cpumask.h
*/
@@ -245,7 +264,7 @@ struct dma_device {
unsigned int src_cnt, size_t len, unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_dma_xor_val)(
struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt,
- size_t len, u32 *result, unsigned long flags);
+ size_t len, enum sum_check_flags *result, unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_dma_memset)(
struct dma_chan *chan, dma_addr_t dest, int value, size_t len,
unsigned long flags);