rapidio: add enumeration/discovery start from user space

Add RapidIO enumeration/discovery start from user space.  User space
start allows to defer RapidIO fabric scan until the moment when all
participating endpoints are initialized avoiding mandatory synchronized
start of all endpoints (which may be challenging in systems with large
number of RapidIO endpoints).

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@Prodrive.nl>
Cc: Micha Nelissen <micha.nelissen@Prodrive.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/include/linux/rio.h b/include/linux/rio.h
index cd3796ee7410..18e099342e6f 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -265,6 +265,11 @@ struct rio_mport {
         struct rio_scan *nscan;
 };
 
+/*
+ * Enumeration/discovery control flags
+ */
+#define RIO_SCAN_ENUM_NO_WAIT   0x00000001 /* Do not wait for enum completed */
+
 struct rio_id_table {
         u16 start;      /* logical minimal id */
         u32 max;        /* max number of IDs in table */
@@ -467,8 +472,8 @@ static inline struct rio_mport *dma_to_mport(struct dma_device *ddev)
  * @discover: Callback to perform RapidIO fabric discovery.
  */
 struct rio_scan {
-        int (*enumerate)(struct rio_mport *mport);
-        int (*discover)(struct rio_mport *mport);
+        int (*enumerate)(struct rio_mport *mport, u32 flags);
+        int (*discover)(struct rio_mport *mport, u32 flags);
 };
 
 /* Architecture and hardware-specific functions */