powerpc: Add set_mode hcall

This new hcall in POWER8 is used to set various resource mode registers.
eg. it can set address translation mode on interrupt (note: partition wide
scope)

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

4 files changed, 12 insertions, 2 deletions

diff --git a/arch/powerpc/include/asm/firmware.h b/arch/powerpc/include/asm/firmware.h
index ad0b751b0d78..973cc3be011b 100644
--- a/arch/powerpc/include/asm/firmware.h
+++ b/arch/powerpc/include/asm/firmware.h
@@ -49,6 +49,7 @@
 #define FW_FEATURE_XCMO         ASM_CONST(0x0000000008000000)
 #define FW_FEATURE_OPAL         ASM_CONST(0x0000000010000000)
 #define FW_FEATURE_OPALv2       ASM_CONST(0x0000000020000000)
+#define FW_FEATURE_SET_MODE     ASM_CONST(0x0000000040000000)
 
 #ifndef __ASSEMBLY__
 
@@ -62,7 +63,8 @@ enum {
                 FW_FEATURE_VIO | FW_FEATURE_RDMA | FW_FEATURE_LLAN |
                 FW_FEATURE_BULK_REMOVE | FW_FEATURE_XDABR |
                 FW_FEATURE_MULTITCE | FW_FEATURE_SPLPAR | FW_FEATURE_LPAR |
-                FW_FEATURE_CMO | FW_FEATURE_VPHN | FW_FEATURE_XCMO,
+                FW_FEATURE_CMO | FW_FEATURE_VPHN | FW_FEATURE_XCMO |
+                FW_FEATURE_SET_MODE,
         FW_FEATURE_PSERIES_ALWAYS = 0,
         FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL | FW_FEATURE_OPALv2,
         FW_FEATURE_POWERNV_ALWAYS = 0,
diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index 7a867065db79..a3d26d8f63cd 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -267,7 +267,8 @@
 #define H_RANDOM                0x300
 #define H_COP                   0x304
 #define H_GET_MPP_X             0x314
-#define MAX_HCALL_OPCODE        H_GET_MPP_X
+#define H_SET_MODE              0x31C
+#define MAX_HCALL_OPCODE        H_SET_MODE
 
 #ifndef __ASSEMBLY__
 
diff --git a/arch/powerpc/platforms/pseries/firmware.c b/arch/powerpc/platforms/pseries/firmware.c
index 0b0eff0cce35..7b56118f531c 100644
--- a/arch/powerpc/platforms/pseries/firmware.c
+++ b/arch/powerpc/platforms/pseries/firmware.c
@@ -56,6 +56,7 @@ firmware_features_table[FIRMWARE_MAX_FEATURES] = {
         {FW_FEATURE_MULTITCE,           "hcall-multi-tce"},
         {FW_FEATURE_SPLPAR,             "hcall-splpar"},
         {FW_FEATURE_VPHN,               "hcall-vphn"},
+        {FW_FEATURE_SET_MODE,           "hcall-set-mode"},
 };
 
 /* Build up the firmware features bitmask using the contents of
diff --git a/arch/powerpc/platforms/pseries/plpar_wrappers.h b/arch/powerpc/platforms/pseries/plpar_wrappers.h
index 13e8cc43adf7..44ad21403452 100644
--- a/arch/powerpc/platforms/pseries/plpar_wrappers.h
+++ b/arch/powerpc/platforms/pseries/plpar_wrappers.h
@@ -273,4 +273,10 @@ static inline long plpar_put_term_char(unsigned long termno, unsigned long len,
                         lbuf[1]);
 }
 
+/* Set various resource mode parameters */
+static inline long plpar_set_mode(unsigned long mflags, unsigned long resource,
+                unsigned long value1, unsigned long value2)
+{
+        return plpar_hcall_norets(H_SET_MODE, mflags, resource, value1, value2);
+}
 #endif /* _PSERIES_PLPAR_WRAPPERS_H */