powerpc: Add book3s privileged doorbell exception vectors

Directed Privileged Doorbell Interrupts come in at 0xa00 (or
0xc000000000004a00 if relocation on exception 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>

diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index 9d5367e..b1edd80 100644 (file)
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -305,6 +305,7 @@ 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_0xa00     PACA_IRQ_DBELL
 #define SOFTEN_VALUE_0xe80     PACA_IRQ_DBELL
 #define SOFTEN_VALUE_0xe82     PACA_IRQ_DBELL
 

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index d08a3cd..176bf99 100644 (file)
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -252,7 +252,7 @@ hardware_interrupt_hv:
        MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer)
        STD_EXCEPTION_HV(0x980, 0x982, hdecrementer)
 
-       STD_EXCEPTION_PSERIES(0xa00, 0xa00, trap_0a)
+       MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super)
        KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
 
        STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
@@ -655,7 +655,11 @@ machine_check_common:
        STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
        STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, .timer_interrupt)
        STD_EXCEPTION_COMMON(0x980, hdecrementer, .hdec_interrupt)
-       STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception)
+#ifdef CONFIG_PPC_DOORBELL
+       STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .doorbell_exception)
+#else
+       STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .unknown_exception)
+#endif
        STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
        STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
        STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
@@ -755,6 +759,7 @@ hardware_interrupt_relon_hv:
        STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable)
        MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer)
        STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer)
+       MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super)
        STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b)
 
        . = 0x4c00