powerpc/pseries: Enable the PFO-based RNG accelerator

This patch adds the cas bits to advertise support for the Platform
Facilities Option (PFO) based random number generator accerator.
The pseries-rng driver provides support for this hardware feature.

Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 2acf54ae8491..5b7e514e7919 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -704,6 +704,7 @@ static void __init early_cmdline_parse(void)
 #define OV5_XCMO                        0x00
 #endif
 #define OV5_TYPE1_AFFINITY      0x80    /* Type 1 NUMA affinity */
+#define OV5_PFO_HW_RNG          0x80    /* PFO Random Number Generator */
 
 /* Option Vector 6: IBM PAPR hints */
 #define OV6_LINUX               0x02    /* Linux is our OS */
@@ -752,7 +753,7 @@ static unsigned char ibm_architecture_vec[] = {
         OV4_MIN_ENT_CAP,                /* minimum VP entitled capacity */
 
         /* option vector 5: PAPR/OF options */
-        13 - 2,                         /* length */
+        18 - 2,                         /* length */
         0,                              /* don't ignore, don't halt */
         OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES | OV5_DRCONF_MEMORY |
         OV5_DONATE_DEDICATE_CPU | OV5_MSI,
@@ -768,6 +769,11 @@ static unsigned char ibm_architecture_vec[] = {
          */
 #define IBM_ARCH_VEC_NRCORES_OFFSET     101
         W(NR_CPUS),                     /* number of cores supported */
+        0,
+        0,
+        0,
+        0,
+        OV5_PFO_HW_RNG,
 
         /* option vector 6: IBM PAPR hints */
         4 - 2,                          /* length */