powerpc/opal: add MPIPL interface definitions

MPIPL is Memory Preserving IPL supported from POWER9. This enables the
kernel to reset the system with memory 'preserved'. Also, it supports
copying memory from a source address to some destination address during
MPIPL boot. Add MPIPL interface definitions here to leverage these f/w
features in adding FADump support for PowerNV platform.
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821340710.5656.10071829040515662624.stgit@hbathini.in.ibm.com

arch/powerpc/include/asm/opal-api.h

@@ -208,7 +208,10 @@
 #define OPAL_HANDLE_HMI2			166
 #define	OPAL_NX_COPROC_INIT			167
 #define OPAL_XIVE_GET_VP_STATE			170
-#define OPAL_LAST				170
+#define OPAL_MPIPL_UPDATE			173
+#define OPAL_MPIPL_REGISTER_TAG			174
+#define OPAL_MPIPL_QUERY_TAG			175
+#define OPAL_LAST				175
 
 #define QUIESCE_HOLD			1 /* Spin all calls at entry */
 #define QUIESCE_REJECT			2 /* Fail all calls with OPAL_BUSY */
@@ -1060,6 +1063,7 @@ enum {
 	OPAL_REBOOT_NORMAL		= 0,
 	OPAL_REBOOT_PLATFORM_ERROR	= 1,
 	OPAL_REBOOT_FULL_IPL		= 2,
+	OPAL_REBOOT_MPIPL		= 3,
 };
 
 /* Argument to OPAL_PCI_TCE_KILL */
@@ -1136,6 +1140,44 @@ enum {
 #define OPAL_PCI_P2P_LOAD		0x2
 #define OPAL_PCI_P2P_STORE		0x4
 
+/* MPIPL update operations */
+enum opal_mpipl_ops {
+	OPAL_MPIPL_ADD_RANGE			= 0,
+	OPAL_MPIPL_REMOVE_RANGE			= 1,
+	OPAL_MPIPL_REMOVE_ALL			= 2,
+	OPAL_MPIPL_FREE_PRESERVED_MEMORY	= 3,
+};
+
+/* Tag will point to various metadata area. Kernel will
+ * use tag to get metadata value.
+ */
+enum opal_mpipl_tags {
+	OPAL_MPIPL_TAG_CPU	= 0,
+	OPAL_MPIPL_TAG_OPAL	= 1,
+	OPAL_MPIPL_TAG_KERNEL	= 2,
+	OPAL_MPIPL_TAG_BOOT_MEM	= 3,
+};
+
+/* Preserved memory details */
+struct opal_mpipl_region {
+	__be64	src;
+	__be64	dest;
+	__be64	size;
+};
+
+/* Structure version */
+#define OPAL_MPIPL_VERSION		0x01
+
+struct opal_mpipl_fadump {
+	u8	version;
+	u8	reserved[7];
+	__be32	crashing_pir;	/* OPAL crashing CPU PIR */
+	__be32	cpu_data_version;
+	__be32	cpu_data_size;
+	__be32	region_cnt;
+	struct	opal_mpipl_region region[];
+} __packed;
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __OPAL_API_H */

arch/powerpc/include/asm/opal.h

@@ -39,6 +39,7 @@ int64_t opal_npu_spa_clear_cache(uint64_t phb_id, uint32_t bdfn,
 				uint64_t PE_handle);
 int64_t opal_npu_tl_set(uint64_t phb_id, uint32_t bdfn, long cap,
 			uint64_t rate_phys, uint32_t size);
+
 int64_t opal_console_write(int64_t term_number, __be64 *length,
 			   const uint8_t *buffer);
 int64_t opal_console_read(int64_t term_number, __be64 *length,
@@ -297,6 +298,10 @@ int opal_sensor_group_clear(u32 group_hndl, int token);
 int opal_sensor_group_enable(u32 group_hndl, int token, bool enable);
 int opal_nx_coproc_init(uint32_t chip_id, uint32_t ct);
 
+s64 opal_mpipl_update(enum opal_mpipl_ops op, u64 src, u64 dest, u64 size);
+s64 opal_mpipl_register_tag(enum opal_mpipl_tags tag, u64 addr);
+s64 opal_mpipl_query_tag(enum opal_mpipl_tags tag, u64 *addr);
+
 s64 opal_signal_system_reset(s32 cpu);
 s64 opal_quiesce(u64 shutdown_type, s32 cpu);
 

arch/powerpc/platforms/powernv/opal-call.c

@@ -287,3 +287,6 @@ OPAL_CALL(opal_pci_set_pbcq_tunnel_bar,		OPAL_PCI_SET_PBCQ_TUNNEL_BAR);
 OPAL_CALL(opal_sensor_read_u64,			OPAL_SENSOR_READ_U64);
 OPAL_CALL(opal_sensor_group_enable,		OPAL_SENSOR_GROUP_ENABLE);
 OPAL_CALL(opal_nx_coproc_init,			OPAL_NX_COPROC_INIT);
+OPAL_CALL(opal_mpipl_update,			OPAL_MPIPL_UPDATE);
+OPAL_CALL(opal_mpipl_register_tag,		OPAL_MPIPL_REGISTER_TAG);
+OPAL_CALL(opal_mpipl_query_tag,			OPAL_MPIPL_QUERY_TAG);