powerpc/pseries: Add hypercall wrappers for hash page table resizing

This adds the hypercall numbers and wrapper functions for the hash page
table resizing hypercalls.

These hypercall numbers are defined in the PAPR ACR "HPT resizing
option".

It also adds a new firmware feature flag to track the presence of the
HPT resizing calls.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/firmware.h

@@ -42,7 +42,7 @@
 #define FW_FEATURE_SPLPAR	ASM_CONST(0x0000000000100000)
 #define FW_FEATURE_LPAR		ASM_CONST(0x0000000000400000)
 #define FW_FEATURE_PS3_LV1	ASM_CONST(0x0000000000800000)
-/* Free				ASM_CONST(0x0000000001000000) */
+#define FW_FEATURE_HPT_RESIZE	ASM_CONST(0x0000000001000000)
 #define FW_FEATURE_CMO		ASM_CONST(0x0000000002000000)
 #define FW_FEATURE_VPHN		ASM_CONST(0x0000000004000000)
 #define FW_FEATURE_XCMO		ASM_CONST(0x0000000008000000)
@@ -66,7 +66,8 @@ enum {
 		FW_FEATURE_MULTITCE | FW_FEATURE_SPLPAR | FW_FEATURE_LPAR |
 		FW_FEATURE_CMO | FW_FEATURE_VPHN | FW_FEATURE_XCMO |
 		FW_FEATURE_SET_MODE | FW_FEATURE_BEST_ENERGY |
-		FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN,
+		FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN |
+		FW_FEATURE_HPT_RESIZE,
 	FW_FEATURE_PSERIES_ALWAYS = 0,
 	FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL,
 	FW_FEATURE_POWERNV_ALWAYS = 0,

arch/powerpc/include/asm/hvcall.h

@@ -276,6 +276,8 @@
 #define H_GET_MPP_X		0x314
 #define H_SET_MODE		0x31C
 #define H_CLEAR_HPT		0x358
+#define H_RESIZE_HPT_PREPARE	0x36C
+#define H_RESIZE_HPT_COMMIT	0x370
 #define H_SIGNAL_SYS_RESET	0x380
 #define MAX_HCALL_OPCODE	H_SIGNAL_SYS_RESET
 

arch/powerpc/include/asm/plpar_wrappers.h

@@ -210,6 +210,18 @@ static inline long plpar_pte_protect(unsigned long flags, unsigned long ptex,
 	return plpar_hcall_norets(H_PROTECT, flags, ptex, avpn);
 }
 
+static inline long plpar_resize_hpt_prepare(unsigned long flags,
+					    unsigned long shift)
+{
+	return plpar_hcall_norets(H_RESIZE_HPT_PREPARE, flags, shift);
+}
+
+static inline long plpar_resize_hpt_commit(unsigned long flags,
+					   unsigned long shift)
+{
+	return plpar_hcall_norets(H_RESIZE_HPT_COMMIT, flags, shift);
+}
+
 static inline long plpar_tce_get(unsigned long liobn, unsigned long ioba,
 		unsigned long *tce_ret)
 {

arch/powerpc/platforms/pseries/firmware.c

@@ -64,6 +64,7 @@ hypertas_fw_features_table[] = {
 	{FW_FEATURE_VPHN,		"hcall-vphn"},
 	{FW_FEATURE_SET_MODE,		"hcall-set-mode"},
 	{FW_FEATURE_BEST_ENERGY,	"hcall-best-energy-1*"},
+	{FW_FEATURE_HPT_RESIZE,		"hcall-hpt-resize"},
 };
 
 /* Build up the firmware features bitmask using the contents of