powerpc: Add book3s hypervisor doorbell exception vectors

Directed Hypervisor Doorbell Interrupts come in at 0xe80 (or
0xc000000000004e80 if relocation on exceptions is enabled), so add
exception vectors at these locations.

If doorbell support is not compiled in we handle it as an
unknown_exception.

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

2 files changed, 15 insertions, 3 deletions

diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index ad708dda3ba3..9d5367e7e19b 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -305,6 +305,8 @@ label##_relon_hv:					\
 #define SOFTEN_VALUE_0x502      PACA_IRQ_EE
 #define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 #define SOFTEN_VALUE_0x982      PACA_IRQ_DEC
+#define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
+#define SOFTEN_VALUE_0xe82      PACA_IRQ_DBELL
 
 #define __SOFTEN_TEST(h, vec)                                           \
         lbz     r10,PACASOFTIRQEN(r13);                                 \
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 4665e82fa377..d08a3cdb7cbe 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -293,6 +293,8 @@ hv_exception_trampoline:
         b       hmi_exception_hv
         . = 0xe60
         b       hmi_exception_hv
+        . = 0xe80
+        b       h_doorbell_hv
 
         /* We need to deal with the Altivec unavailable exception
          * here which is at 0xf20, thus in the middle of the
@@ -514,6 +516,8 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
         KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
         STD_EXCEPTION_HV(., 0xe62, hmi_exception) /* need to flush cache ? */
         KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
+        MASKABLE_EXCEPTION_HV(., 0xe82, h_doorbell)
+        KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82)
 
         /* moved from 0xf00 */
         STD_EXCEPTION_PSERIES(., 0xf00, performance_monitor)
@@ -657,6 +661,11 @@ machine_check_common:
         STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
         STD_EXCEPTION_COMMON(0xe40, emulation_assist, .program_check_exception)
         STD_EXCEPTION_COMMON(0xe60, hmi_exception, .unknown_exception)
+#ifdef CONFIG_PPC_DOORBELL
+        STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .doorbell_exception)
+#else
+        STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .unknown_exception)
+#endif
         STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, .performance_monitor_exception)
         STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
         STD_EXCEPTION_COMMON(0x1502, denorm, .unknown_exception)
@@ -773,9 +782,8 @@ system_call_relon_pSeries:
         . = 0x4e60
         b       hmi_exception_relon_hv
 
-        /* For when we support the doorbell interrupt:
-        STD_RELON_EXCEPTION_HYPERVISOR(0x4e80, 0xe80, doorbell_hyper)
-        */
+        . = 0x4e80
+        b       h_doorbell_relon_hv
 
 performance_monitor_relon_pSeries_1:
         . = 0x4f00
@@ -1355,6 +1363,8 @@ _GLOBAL(do_stab_bolted)
         KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe40)
         STD_RELON_EXCEPTION_HV(., 0xe60, hmi_exception)
         KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe60)
+        MASKABLE_RELON_EXCEPTION_HV(., 0xe80, h_doorbell)
+        KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe80)
 
         STD_RELON_EXCEPTION_PSERIES(., 0xf00, performance_monitor)
         STD_RELON_EXCEPTION_PSERIES(., 0xf20, altivec_unavailable)