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>

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 2acf54a..5b7e514 100644 (file)
--- 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 */