staging: fsl-mc/dpio: Add dpaa2_io_service_select() API

All DPIO service API functions receive a dpaa2_io service pointer
as parameter (NULL meaning any service will do) which indicates
the hardware resource to be used to execute the specified command.

There isn't however any available API for obtaining such a service
reference that could be used further, effectively forcing the users
to always request a random service for DPIO operations.
(The DPIO driver holds internally an array mapping services to cpus,
and affine services can be indirectly requested by a couple of API
functions: dpaa2_io_service_register and dpaa2_io_service_rearm
use the cpu id provided by the user to select the corresponding
service)

This patch adds a function for selecting a DPIO service based on
the specified cpu id. If the user provides a "don't care" value
for the cpu, we revert to the default behavior and return the next
DPIO, taken in a round-robin fashion from a list of available
services.
Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Acked-by: Roy Pledge <roy.pledge@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-mc/bus/dpio/dpio-service.c

@@ -103,6 +103,23 @@ static inline struct dpaa2_io *service_select(struct dpaa2_io *d)
 	return d;
 }
 
+/**
+ * dpaa2_io_service_select() - return a dpaa2_io service affined to this cpu
+ * @cpu: the cpu id
+ *
+ * Return the affine dpaa2_io service, or NULL if there is no service affined
+ * to the specified cpu. If DPAA2_IO_ANY_CPU is used, return the next available
+ * service.
+ */
+struct dpaa2_io *dpaa2_io_service_select(int cpu)
+{
+	if (cpu == DPAA2_IO_ANY_CPU)
+		return service_select(NULL);
+
+	return service_select_by_cpu(NULL, cpu);
+}
+EXPORT_SYMBOL_GPL(dpaa2_io_service_select);
+
 /**
  * dpaa2_io_create() - create a dpaa2_io object.
  * @desc: the dpaa2_io descriptor

drivers/staging/fsl-mc/include/dpaa2-io.h

@@ -88,6 +88,8 @@ void dpaa2_io_down(struct dpaa2_io *d);
 
 irqreturn_t dpaa2_io_irq(struct dpaa2_io *obj);
 
+struct dpaa2_io *dpaa2_io_service_select(int cpu);
+
 /**
  * struct dpaa2_io_notification_ctx - The DPIO notification context structure
  * @cb:           The callback to be invoked when the notification arrives