pseries: Return the token when we register an RTAS call

The kernel will soon be able to service some RTAS calls. However the
choice of tokens will still be up to userspace. To support this have
spapr_rtas_register() return the token that is allocated for an
RTAS call, that allows the calling code to tell the kernel what the
token value is.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/hw/spapr.h b/hw/spapr.h
index efe7f5758fc675b8bdbdca30ceb41f740e871203..971a50ab02b459a8536d5662fe954550225376e4 100644 (file)
--- a/hw/spapr.h
+++ b/hw/spapr.h
@@ -320,7 +320,7 @@ static inline void rtas_st(target_ulong phys, int n, uint32_t val)
 typedef void (*spapr_rtas_fn)(sPAPREnvironment *spapr, uint32_t token,
                               uint32_t nargs, target_ulong args,
                               uint32_t nret, target_ulong rets);
-void spapr_rtas_register(const char *name, spapr_rtas_fn fn);
+int spapr_rtas_register(const char *name, spapr_rtas_fn fn);
 target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
                              uint32_t token, uint32_t nargs, target_ulong args,
                              uint32_t nret, target_ulong rets);

diff --git a/hw/spapr_rtas.c b/hw/spapr_rtas.c
index 6d5c48a740062dd0e3fd9c0abd6a1588296faa7a..45294e83056f5af7b9839d9b0945e3b555e4230d 100644 (file)
--- a/hw/spapr_rtas.c
+++ b/hw/spapr_rtas.c
@@ -242,7 +242,7 @@ target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
     return H_PARAMETER;
 }
 
-void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
+int spapr_rtas_register(const char *name, spapr_rtas_fn fn)
 {
     int i;
 
@@ -258,7 +258,7 @@ void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
     rtas_next->name = name;
     rtas_next->fn = fn;
 
-    rtas_next++;
+    return (rtas_next++ - rtas_table) + TOKEN_BASE;
 }
 
 int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,