gru: support for asynchronous gru instructions

Add support for asynchronous GRU instructions.  Currently, asynchronous
instructions are supported only for GRU instructions issued by the kernel.

[akpm@linux-foundation.org: build fix]
Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/drivers/misc/sgi-gru/grukservices.h b/drivers/misc/sgi-gru/grukservices.h
index 747ed315d56f..d60d34bca44d 100644
--- a/drivers/misc/sgi-gru/grukservices.h
+++ b/drivers/misc/sgi-gru/grukservices.h
@@ -146,4 +146,55 @@ extern void *gru_get_next_message(struct gru_message_queue_desc *mqd);
 extern int gru_copy_gpa(unsigned long dest_gpa, unsigned long src_gpa,
                                                         unsigned int bytes);
 
+/*
+ * Reserve GRU resources to be used asynchronously.
+ *
+ *      input:
+ *              blade_id  - blade on which resources should be reserved
+ *              cbrs      - number of CBRs
+ *              dsr_bytes - number of DSR bytes needed
+ *              cmp       - completion structure for waiting for
+ *                          async completions
+ *      output:
+ *              handle to identify resource
+ *              (0 = no resources)
+ */
+extern unsigned long gru_reserve_async_resources(int blade_id, int cbrs, int dsr_bytes,
+                                struct completion *cmp);
+
+/*
+ * Release async resources previously reserved.
+ *
+ *      input:
+ *              han - handle to identify resources
+ */
+extern void gru_release_async_resources(unsigned long han);
+
+/*
+ * Wait for async GRU instructions to complete.
+ *
+ *      input:
+ *              han - handle to identify resources
+ */
+extern void gru_wait_async_cbr(unsigned long han);
+
+/*
+ * Lock previous reserved async GRU resources
+ *
+ *      input:
+ *              han - handle to identify resources
+ *      output:
+ *              cb  - pointer to first CBR
+ *              dsr - pointer to first DSR
+ */
+extern void gru_lock_async_resource(unsigned long han,  void **cb, void **dsr);
+
+/*
+ * Unlock previous reserved async GRU resources
+ *
+ *      input:
+ *              han - handle to identify resources
+ */
+extern void gru_unlock_async_resource(unsigned long han);
+
 #endif          /* __GRU_KSERVICES_H_ */