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

3 files changed, 51 insertions, 1 deletions

diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index 1cad413e1e0e..378e3997845a 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/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 */
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index d5a0807d21db..a0cf8fba4d12 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/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);
 
diff --git a/arch/powerpc/platforms/powernv/opal-call.c b/arch/powerpc/platforms/powernv/opal-call.c
index dccdc9df5213..a2aa5e433ac8 100644
--- a/arch/powerpc/platforms/powernv/opal-call.c
+++ b/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);