Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[pandora-kernel.git] / Documentation / crypto / async-tx-api.txt

diff --git a/Documentation/crypto/async-tx-api.txt b/Documentation/crypto/async-tx-api.txt
index 9f59fcb..ba046b8 100644 (file)
--- a/Documentation/crypto/async-tx-api.txt
+++ b/Documentation/crypto/async-tx-api.txt
@@ -54,20 +54,23 @@ features surfaced as a result:
 
 3.1 General format of the API:
 struct dma_async_tx_descriptor *
-async_<operation>(<op specific parameters>,
-                 enum async_tx_flags flags,
-                 struct dma_async_tx_descriptor *dependency,
-                 dma_async_tx_callback callback_routine,
-                 void *callback_parameter);
+async_<operation>(<op specific parameters>, struct async_submit ctl *submit)
 
 3.2 Supported operations:
-memcpy       - memory copy between a source and a destination buffer
-memset       - fill a destination buffer with a byte value
-xor          - xor a series of source buffers and write the result to a
-              destination buffer
-xor_zero_sum - xor a series of source buffers and set a flag if the
-              result is zero.  The implementation attempts to prevent
-              writes to memory
+memcpy  - memory copy between a source and a destination buffer
+memset  - fill a destination buffer with a byte value
+xor     - xor a series of source buffers and write the result to a
+         destination buffer
+xor_val - xor a series of source buffers and set a flag if the
+         result is zero.  The implementation attempts to prevent
+         writes to memory
+pq     - generate the p+q (raid6 syndrome) from a series of source buffers
+pq_val  - validate that a p and or q buffer are in sync with a given series of
+         sources
+datap  - (raid6_datap_recov) recover a raid6 data block and the p block
+         from the given sources
+2data  - (raid6_2data_recov) recover 2 raid6 data blocks from the given
+         sources
 
 3.3 Descriptor management:
 The return value is non-NULL and points to a 'descriptor' when the operation
@@ -80,8 +83,8 @@ acknowledged by the application before the offload engine driver is allowed to
 recycle (or free) the descriptor.  A descriptor can be acked by one of the
 following methods:
 1/ setting the ASYNC_TX_ACK flag if no child operations are to be submitted
-2/ setting the ASYNC_TX_DEP_ACK flag to acknowledge the parent
-   descriptor of a new operation.
+2/ submitting an unacknowledged descriptor as a dependency to another
+   async_tx call will implicitly set the acknowledged state.
 3/ calling async_tx_ack() on the descriptor.
 
 3.4 When does the operation execute?
@@ -119,30 +122,42 @@ of an operation.
 Perform a xor->copy->xor operation where each operation depends on the
 result from the previous operation:
 
-void complete_xor_copy_xor(void *param)
+void callback(void *param)
 {
-       printk("complete\n");
+       struct completion *cmp = param;
+
+       complete(cmp);
 }
 
-int run_xor_copy_xor(struct page **xor_srcs,
-                    int xor_src_cnt,
-                    struct page *xor_dest,
-                    size_t xor_len,
-                    struct page *copy_src,
-                    struct page *copy_dest,
-                    size_t copy_len)
+void run_xor_copy_xor(struct page **xor_srcs,
+                     int xor_src_cnt,
+                     struct page *xor_dest,
+                     size_t xor_len,
+                     struct page *copy_src,
+                     struct page *copy_dest,
+                     size_t copy_len)
 {
        struct dma_async_tx_descriptor *tx;
+       addr_conv_t addr_conv[xor_src_cnt];
+       struct async_submit_ctl submit;
+       addr_conv_t addr_conv[NDISKS];
+       struct completion cmp;
+
+       init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST, NULL, NULL, NULL,
+                         addr_conv);
+       tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, &submit)
 
-       tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len,
-                      ASYNC_TX_XOR_DROP_DST, NULL, NULL, NULL);
-       tx = async_memcpy(copy_dest, copy_src, 0, 0, copy_len,
-                         ASYNC_TX_DEP_ACK, tx, NULL, NULL);
-       tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len,
-                      ASYNC_TX_XOR_DROP_DST | ASYNC_TX_DEP_ACK | ASYNC_TX_ACK,
-                      tx, complete_xor_copy_xor, NULL);
+       submit->depend_tx = tx;
+       tx = async_memcpy(copy_dest, copy_src, 0, 0, copy_len, &submit);
+
+       init_completion(&cmp);
+       init_async_submit(&submit, ASYNC_TX_XOR_DROP_DST | ASYNC_TX_ACK, tx,
+                         callback, &cmp, addr_conv);
+       tx = async_xor(xor_dest, xor_srcs, 0, xor_src_cnt, xor_len, &submit);
 
        async_tx_issue_pending_all();
+
+       wait_for_completion(&cmp);
 }
 
 See include/linux/async_tx.h for more information on the flags.  See the