powerpc: More work to support HV exceptions

Rework exception macros a bit to split offset from vector and add
some basic support for HDEC, HDSI, HISI and a few more.

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 1d98e05..fb5b0af 100644 (file)
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -150,28 +150,27 @@
 /*
  * Exception vectors.
  */
-#define STD_EXCEPTION_PSERIES(n, label)                        \
-       . = n;                                          \
+#define STD_EXCEPTION_PSERIES(loc, vec, label)         \
+       . = loc;                                        \
        .globl label##_pSeries;                         \
 label##_pSeries:                                       \
        HMT_MEDIUM;                                     \
-       DO_KVM  n;                                      \
+       DO_KVM  vec;                                    \
        mtspr   SPRN_SPRG_SCRATCH0,r13;         /* save r13 */  \
        EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, EXC_STD)
 
-#define HSTD_EXCEPTION_PSERIES(n, label)               \
-       . = n;                                          \
-       .globl label##_pSeries;                         \
-label##_pSeries:                                       \
+#define STD_EXCEPTION_HV(loc, vec, label)              \
+       . = loc;                                        \
+       .globl label##_hv;                              \
+label##_hv:                                            \
        HMT_MEDIUM;                                     \
-       DO_KVM  n;                                      \
+       DO_KVM  vec;                                    \
        mtspr   SPRN_SPRG_HSCRATCH0,r13;/* save r13 */  \
        EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, EXC_HV)
 
-
-#define __MASKABLE_EXCEPTION_PSERIES(n, label, h)                      \
+#define __MASKABLE_EXCEPTION_PSERIES(vec, label, h)                    \
        HMT_MEDIUM;                                                     \
-       DO_KVM  n;                                                      \
+       DO_KVM  vec;                                                    \
        mtspr   SPRN_SPRG_##h##SCRATCH0,r13;    /* save r13 */          \
        GET_PACA(r13);                                                  \
        std     r9,PACA_EXGEN+EX_R9(r13);       /* save r9, r10 */      \
@@ -193,8 +192,20 @@ label##_pSeries:                                   \
        mtspr   SPRN_##h##SRR1,r10;                                     \
        h##rfid;                                                        \
        b       .       /* prevent speculative execution */
-#define MASKABLE_EXCEPTION_PSERIES(n, label, h)                                \
-       __MASKABLE_EXCEPTION_PSERIES(n, label, h)
+#define _MASKABLE_EXCEPTION_PSERIES(vec, label, h)                     \
+       __MASKABLE_EXCEPTION_PSERIES(vec, label, h)
+
+#define MASKABLE_EXCEPTION_PSERIES(loc, vec, label)                    \
+       . = loc;                                                        \
+       .globl label##_pSeries;                                         \
+label##_pSeries:                                                       \
+       _MASKABLE_EXCEPTION_PSERIES(vec, label, EXC_STD)
+
+#define MASKABLE_EXCEPTION_HV(loc, vec, label)                         \
+       . = loc;                                                        \
+       .globl label##_hv;                                              \
+label##_hv:                                                            \
+       _MASKABLE_EXCEPTION_PSERIES(vec, label, EXC_HV)
 
 #ifdef CONFIG_PPC_ISERIES
 #define DISABLE_INTS                           \

diff --git a/arch/powerpc/include/asm/feature-fixups.h b/arch/powerpc/include/asm/feature-fixups.h
index 921a847..bdc0d68 100644 (file)
--- a/arch/powerpc/include/asm/feature-fixups.h
+++ b/arch/powerpc/include/asm/feature-fixups.h
@@ -49,7 +49,7 @@ label##5:                                                     \
        FTR_ENTRY_OFFSET label##2b-label##5b;                   \
        FTR_ENTRY_OFFSET label##3b-label##5b;                   \
        FTR_ENTRY_OFFSET label##4b-label##5b;                   \
-       .ifgt (label##4b-label##3b)-(label##2b-label##1b);      \
+       .ifgt (label##4b- label##3b)-(label##2b- label##1b);    \
        .error "Feature section else case larger than body";    \
        .endif;                                                 \
        .popsection;

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 17f1d66..805e206 100644 (file)
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -37,7 +37,7 @@
        .globl __start_interrupts
 __start_interrupts:
 
-       STD_EXCEPTION_PSERIES(0x100, system_reset)
+       STD_EXCEPTION_PSERIES(0x100, 0x100, system_reset)
 
        . = 0x200
 _machine_check_pSeries:
@@ -113,7 +113,7 @@ data_access_slb_pSeries:
        bctr
 #endif
 
-       STD_EXCEPTION_PSERIES(0x400, instruction_access)
+       STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access)
 
        . = 0x480
        .globl instruction_access_slb_pSeries
@@ -147,26 +147,29 @@ instruction_access_slb_pSeries:
        bctr
 #endif
 
+       /* We open code these as we can't have a ". = x" (even with
+        * x = "." within a feature section
+        */
        . = 0x500;
-       .globl hardware_interrupt_pSeries
+       .globl hardware_interrupt_pSeries;
+       .globl hardware_interrupt_hv;
 hardware_interrupt_pSeries:
+hardware_interrupt_hv:
        BEGIN_FTR_SECTION
-       MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD)
+               _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD)
        FTR_SECTION_ELSE
-       MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV)
+               _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV)
        ALT_FTR_SECTION_END_IFCLR(CPU_FTR_HVMODE_206)
 
-       STD_EXCEPTION_PSERIES(0x600, alignment)
-       STD_EXCEPTION_PSERIES(0x700, program_check)
-       STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
+       STD_EXCEPTION_PSERIES(0x600, 0x600, alignment)
+       STD_EXCEPTION_PSERIES(0x700, 0x700, program_check)
+       STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
 
-       . = 0x900;
-       .globl decrementer_pSeries
-decrementer_pSeries:
-       MASKABLE_EXCEPTION_PSERIES(0x900, decrementer, EXC_STD)
+       MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer)
+       MASKABLE_EXCEPTION_HV(0x980, 0x980, decrementer)
 
-       STD_EXCEPTION_PSERIES(0xa00, trap_0a)
-       STD_EXCEPTION_PSERIES(0xb00, trap_0b)
+       STD_EXCEPTION_PSERIES(0xa00, 0xa00, trap_0a)
+       STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
 
        . = 0xc00
        .globl  system_call_pSeries
@@ -196,8 +199,21 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
        rfid            /* return to userspace */
        b       .
 
-       STD_EXCEPTION_PSERIES(0xd00, single_step)
-       STD_EXCEPTION_PSERIES(0xe00, trap_0e)
+       STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
+
+       /* At 0xe??? we have a bunch of hypervisor exceptions, we branch
+        * out of line to handle them
+        */
+       . = 0xe00
+       b       h_data_storage_hv
+       . = 0xe20
+       b       h_instr_storage_hv
+       . = 0xe40
+       b       emulation_assist_hv
+       . = 0xe50
+       b       hmi_exception_hv
+       . = 0xe60
+       b       hmi_exception_hv
 
        /* We need to deal with the Altivec unavailable exception
         * here which is at 0xf20, thus in the middle of the
@@ -206,39 +222,42 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
         */
 performance_monitor_pSeries_1:
        . = 0xf00
-       DO_KVM  0xf00
        b       performance_monitor_pSeries
 
 altivec_unavailable_pSeries_1:
        . = 0xf20
-       DO_KVM  0xf20
        b       altivec_unavailable_pSeries
 
 vsx_unavailable_pSeries_1:
        . = 0xf40
-       DO_KVM  0xf40
        b       vsx_unavailable_pSeries
 
 #ifdef CONFIG_CBE_RAS
-       HSTD_EXCEPTION_PSERIES(0x1202, cbe_system_error)
+       STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
 #endif /* CONFIG_CBE_RAS */
-       STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint)
+       STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint)
 #ifdef CONFIG_CBE_RAS
-       HSTD_EXCEPTION_PSERIES(0x1602, cbe_maintenance)
+       STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
 #endif /* CONFIG_CBE_RAS */
-       STD_EXCEPTION_PSERIES(0x1700, altivec_assist)
+       STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist)
 #ifdef CONFIG_CBE_RAS
-       HSTD_EXCEPTION_PSERIES(0x1802, cbe_thermal)
+       STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
 #endif /* CONFIG_CBE_RAS */
 
        . = 0x3000
 
-/*** pSeries interrupt support ***/
+/*** Out of line interrupts support ***/
+
+       /* moved from 0xe00 */
+       STD_EXCEPTION_HV(., 0xe00, h_data_storage)
+       STD_EXCEPTION_HV(., 0xe20, h_instr_storage)
+       STD_EXCEPTION_HV(., 0xe40, emulation_assist)
+       STD_EXCEPTION_HV(., 0xe60, hmi_exception) /* need to flush cache ? */
 
        /* moved from 0xf00 */
-       STD_EXCEPTION_PSERIES(., performance_monitor)
-       STD_EXCEPTION_PSERIES(., altivec_unavailable)
-       STD_EXCEPTION_PSERIES(., vsx_unavailable)
+       STD_EXCEPTION_PSERIES(., 0xf00, performance_monitor)
+       STD_EXCEPTION_PSERIES(., 0xf20, altivec_unavailable)
+       STD_EXCEPTION_PSERIES(., 0xf40, vsx_unavailable)
 
 /*
  * An interrupt came in while soft-disabled; clear EE in SRR1,
@@ -368,6 +387,8 @@ machine_check_common:
        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)
+        STD_EXCEPTION_COMMON(0xe40, emulation_assist, .program_check_exception)
+        STD_EXCEPTION_COMMON(0xe60, hmi_exception, .unknown_exception)
        STD_EXCEPTION_COMMON_IDLE(0xf00, performance_monitor, .performance_monitor_exception)
        STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
 #ifdef CONFIG_ALTIVEC
@@ -445,6 +466,19 @@ data_access_common:
        li      r5,0x300
        b       .do_hash_page           /* Try to handle as hpte fault */
 
+       .align  7
+        .globl  h_data_storage_common
+h_data_storage_common:
+        mfspr   r10,SPRN_HDAR
+        std     r10,PACA_EXGEN+EX_DAR(r13)
+        mfspr   r10,SPRN_HDSISR
+        stw     r10,PACA_EXGEN+EX_DSISR(r13)
+        EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
+        bl      .save_nvgprs
+        addi    r3,r1,STACK_FRAME_OVERHEAD
+        bl      .unknown_exception
+        b       .ret_from_except
+
        .align  7
        .globl instruction_access_common
 instruction_access_common:
@@ -454,6 +488,8 @@ instruction_access_common:
        li      r5,0x400
        b       .do_hash_page           /* Try to handle as hpte fault */
 
+        STD_EXCEPTION_COMMON(0xe20, h_instr_storage, .unknown_exception)
+
 /*
  * Here is the common SLB miss user that is used when going to virtual
  * mode for SLB misses, that is currently not used