powerpc/powernv: Machine check and other system interrupts

OPAL can handle various interrupt for us such as Machine Checks (it
performs all sorts of recovery tasks and passes back control to us with
informations about the error), Hardware Management Interrupts and Softpatch
interrupts.

This wires up the mechanisms and prints out specific informations returned
by HAL when a machine check occurs.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 33 insertions, 4 deletions

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 5f078bc2063e..536ffa897c6c 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -48,6 +48,9 @@
 #ifdef CONFIG_PPC_ISERIES
 #include <asm/iseries/alpaca.h>
 #endif
+#ifdef CONFIG_PPC_POWERNV
+#include <asm/opal.h>
+#endif
 #if defined(CONFIG_KVM) || defined(CONFIG_KVM_GUEST)
 #include <linux/kvm_host.h>
 #endif
@@ -609,5 +612,12 @@ int main(void)
                                         arch.timing_last_enter.tv32.tbl));
 #endif
 
+#ifdef CONFIG_PPC_POWERNV
+        DEFINE(OPAL_MC_GPR3, offsetof(struct opal_machine_check_event, gpr3));
+        DEFINE(OPAL_MC_SRR0, offsetof(struct opal_machine_check_event, srr0));
+        DEFINE(OPAL_MC_SRR1, offsetof(struct opal_machine_check_event, srr1));
+        DEFINE(PACA_OPAL_MC_EVT, offsetof(struct paca_struct, opal_mc_evt));
+#endif
+
         return 0;
 }
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 41b02c792aa3..d51458fa8dee 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -1143,7 +1143,7 @@ _GLOBAL(do_stab_bolted)
         rfid
         b       .       /* prevent speculative execution */
 
-#ifdef CONFIG_PPC_PSERIES
+#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
 /*
  * Data area reserved for FWNMI option.
  * This address (0x7000) is fixed by the RPA.
@@ -1151,7 +1151,7 @@ _GLOBAL(do_stab_bolted)
         .= 0x7000
         .globl fwnmi_data_area
 fwnmi_data_area:
-#endif /* CONFIG_PPC_PSERIES */
+#endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
 
         /* iSeries does not use the FWNMI stuff, so it is safe to put
          * this here, even if we later allow kernels that will boot on
@@ -1176,9 +1176,12 @@ xLparMap:
 
 #endif /* CONFIG_PPC_ISERIES */
 
-#ifdef CONFIG_PPC_PSERIES
+#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
+        /* pseries and powernv need to keep the whole page from
+         * 0x7000 to 0x8000 free for use by the firmware
+         */
         . = 0x8000
-#endif /* CONFIG_PPC_PSERIES */
+#endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
 
 /*
  * Space for CPU0's segment table.
@@ -1193,3 +1196,19 @@ xLparMap:
         .globl initial_stab
 initial_stab:
         .space  4096
+#ifdef CONFIG_PPC_POWERNV
+_GLOBAL(opal_mc_secondary_handler)
+        HMT_MEDIUM
+        SET_SCRATCH0(r13)
+        GET_PACA(r13)
+        clrldi  r3,r3,2
+        tovirt(r3,r3)
+        std     r3,PACA_OPAL_MC_EVT(r13)
+        ld      r13,OPAL_MC_SRR0(r3)
+        mtspr   SPRN_SRR0,r13
+        ld      r13,OPAL_MC_SRR1(r3)
+        mtspr   SPRN_SRR1,r13
+        ld      r3,OPAL_MC_GPR3(r3)
+        GET_SCRATCH0(r13)
+        b       machine_check_pSeries
+#endif /* CONFIG_PPC_POWERNV */