diff options
| -rw-r--r-- | arch/powerpc/include/asm/paca.h | 7 | ||||
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64e.S | 343 | ||||
| -rw-r--r-- | arch/powerpc/mm/tlb_nohash.c | 11 |
3 files changed, 300 insertions, 61 deletions
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h index 948f01a04cc3..8e956a0b6e85 100644 --- a/arch/powerpc/include/asm/paca.h +++ b/arch/powerpc/include/asm/paca.h @@ -116,8 +116,11 @@ struct paca_struct { /* Shared by all threads of a core -- points to tcd of first thread */ struct tlb_core_data *tcd_ptr; - /* We can have up to 3 levels of reentrancy in the TLB miss handler */ - u64 extlb[3][EX_TLB_SIZE / sizeof(u64)]; + /* + * We can have up to 3 levels of reentrancy in the TLB miss handler, + * in each of four exception levels (normal, crit, mcheck, debug). + */ + u64 extlb[12][EX_TLB_SIZE / sizeof(u64)]; u64 exmc[8]; /* used for machine checks */ u64 excrit[8]; /* used for crit interrupts */ u64 exdbg[8]; /* used for debug interrupts */ diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index 2beb5bd0728b..c1bee3ce9d1f 100644 --- a/arch/powerpc/kernel/exceptions-64e.S +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -34,20 +34,250 @@ * special interrupts from within a non-standard level will probably * blow you up */ -#define SPECIAL_EXC_FRAME_SIZE INT_FRAME_SIZE +#define SPECIAL_EXC_SRR0 0 +#define SPECIAL_EXC_SRR1 1 +#define SPECIAL_EXC_SPRG_GEN 2 +#define SPECIAL_EXC_SPRG_TLB 3 +#define SPECIAL_EXC_MAS0 4 +#define SPECIAL_EXC_MAS1 5 +#define SPECIAL_EXC_MAS2 6 +#define SPECIAL_EXC_MAS3 7 +#define SPECIAL_EXC_MAS6 8 +#define SPECIAL_EXC_MAS7 9 +#define SPECIAL_EXC_MAS5 10 /* E.HV only */ +#define SPECIAL_EXC_MAS8 11 /* E.HV only */ +#define SPECIAL_EXC_IRQHAPPENED 12 +#define SPECIAL_EXC_DEAR 13 +#define SPECIAL_EXC_ESR 14 +#define SPECIAL_EXC_SOFTE 15 +#define SPECIAL_EXC_CSRR0 16 +#define SPECIAL_EXC_CSRR1 17 +/* must be even to keep 16-byte stack alignment */ +#define SPECIAL_EXC_END 18 + +#define SPECIAL_EXC_FRAME_SIZE (INT_FRAME_SIZE + SPECIAL_EXC_END * 8) +#define SPECIAL_EXC_FRAME_OFFS (INT_FRAME_SIZE - 288) + +#define SPECIAL_EXC_STORE(reg, name) \ + std reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1) + +#define SPECIAL_EXC_LOAD(reg, name) \ + ld reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1) + +special_reg_save: + lbz r9,PACAIRQHAPPENED(r13) + RECONCILE_IRQ_STATE(r3,r4) -/* Now we only store something to exception thread info */ -#define EXC_LEVEL_EXCEPTION_PROLOG(type) \ - ld r14,PACAKSAVE(r13); \ - CURRENT_THREAD_INFO(r14, r14); \ - CURRENT_THREAD_INFO(r15, r1); \ - ld r10,TI_FLAGS(r14); \ - std r10,TI_FLAGS(r15); \ - ld r10,TI_PREEMPT(r14); \ - std r10,TI_PREEMPT(r15); \ - ld r10,TI_TASK(r14); \ - std r10,TI_TASK(r15); + /* + * We only need (or have stack space) to save this stuff if + * we interrupted the kernel. + */ + ld r3,_MSR(r1) + andi. r3,r3,MSR_PR + bnelr + + /* Copy info into temporary exception thread info */ + ld r11,PACAKSAVE(r13) + CURRENT_THREAD_INFO(r11, r11) + CURRENT_THREAD_INFO(r12, r1) + ld r10,TI_FLAGS(r11) + std r10,TI_FLAGS(r12) + ld r10,TI_PREEMPT(r11) + std r10,TI_PREEMPT(r12) + ld r10,TI_TASK(r11) + std r10,TI_TASK(r12) + + /* + * Advance to the next TLB exception frame for handler + * types that don't do it automatically. + */ + LOAD_REG_ADDR(r11,extlb_level_exc) + lwz r12,0(r11) + mfspr r10,SPRN_SPRG_TLB_EXFRAME + add r10,r10,r12 + mtspr SPRN_SPRG_TLB_EXFRAME,r10 + + /* + * Save registers needed to allow nesting of certain exceptions + * (such as TLB misses) inside special exception levels + */ + mfspr r10,SPRN_SRR0 + SPECIAL_EXC_STORE(r10,SRR0) + mfspr r10,SPRN_SRR1 + SPECIAL_EXC_STORE(r10,SRR1) + mfspr r10,SPRN_SPRG_GEN_SCRATCH + SPECIAL_EXC_STORE(r10,SPRG_GEN) + mfspr r10,SPRN_SPRG_TLB_SCRATCH + SPECIAL_EXC_STORE(r10,SPRG_TLB) + mfspr r10,SPRN_MAS0 + SPECIAL_EXC_STORE(r10,MAS0) + mfspr r10,SPRN_MAS1 + SPECIAL_EXC_STORE(r10,MAS1) + mfspr r10,SPRN_MAS2 + SPECIAL_EXC_STORE(r10,MAS2) + mfspr r10,SPRN_MAS3 + SPECIAL_EXC_STORE(r10,MAS3) + mfspr r10,SPRN_MAS6 + SPECIAL_EXC_STORE(r10,MAS6) + mfspr r10,SPRN_MAS7 + SPECIAL_EXC_STORE(r10,MAS7) +BEGIN_FTR_SECTION + mfspr r10,SPRN_MAS5 + SPECIAL_EXC_STORE(r10,MAS5) + mfspr r10,SPRN_MAS8 + SPECIAL_EXC_STORE(r10,MAS8) + + /* MAS5/8 could have inappropriate values if we interrupted KVM code */ + li r10,0 + mtspr SPRN_MAS5,r10 + mtspr SPRN_MAS8,r10 +END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) + SPECIAL_EXC_STORE(r9,IRQHAPPENED) + + mfspr r10,SPRN_DEAR + SPECIAL_EXC_STORE(r10,DEAR) + mfspr r10,SPRN_ESR + SPECIAL_EXC_STORE(r10,ESR) + + lbz r10,PACASOFTIRQEN(r13) + SPECIAL_EXC_STORE(r10,SOFTE) + ld r10,_NIP(r1) + SPECIAL_EXC_STORE(r10,CSRR0) + ld r10,_MSR(r1) + SPECIAL_EXC_STORE(r10,CSRR1) + + blr + +ret_from_level_except: + ld r3,_MSR(r1) + andi. r3,r3,MSR_PR + beq 1f + b ret_from_except +1: + + LOAD_REG_ADDR(r11,extlb_level_exc) + lwz r12,0(r11) + mfspr r10,SPRN_SPRG_TLB_EXFRAME + sub r10,r10,r12 + mtspr SPRN_SPRG_TLB_EXFRAME,r10 + + /* + * It's possible that the special level exception interrupted a + * TLB miss handler, and inserted the same entry that the + * interrupted handler was about to insert. On CPUs without TLB + * write conditional, this can result in a duplicate TLB entry. + * Wipe all non-bolted entries to be safe. + * + * Note that this doesn't protect against any TLB misses + * we may take accessing the stack from here to the end of + * the special level exception. It's not clear how we can + * reasonably protect against that, but only CPUs with + * neither TLB write conditional nor bolted kernel memory + * are affected. Do any such CPUs even exist? + */ + PPC_TLBILX_ALL(0,R0) + + REST_NVGPRS(r1) + + SPECIAL_EXC_LOAD(r10,SRR0) + mtspr SPRN_SRR0,r10 + SPECIAL_EXC_LOAD(r10,SRR1) + mtspr SPRN_SRR1,r10 + SPECIAL_EXC_LOAD(r10,SPRG_GEN) + mtspr SPRN_SPRG_GEN_SCRATCH,r10 + SPECIAL_EXC_LOAD(r10,SPRG_TLB) + mtspr SPRN_SPRG_TLB_SCRATCH,r10 + SPECIAL_EXC_LOAD(r10,MAS0) + mtspr SPRN_MAS0,r10 + SPECIAL_EXC_LOAD(r10,MAS1) + mtspr SPRN_MAS1,r10 + SPECIAL_EXC_LOAD(r10,MAS2) + mtspr SPRN_MAS2,r10 + SPECIAL_EXC_LOAD(r10,MAS3) + mtspr SPRN_MAS3,r10 + SPECIAL_EXC_LOAD(r10,MAS6) + mtspr SPRN_MAS6,r10 + SPECIAL_EXC_LOAD(r10,MAS7) + mtspr SPRN_MAS7,r10 +BEGIN_FTR_SECTION + SPECIAL_EXC_LOAD(r10,MAS5) + mtspr SPRN_MAS5,r10 + SPECIAL_EXC_LOAD(r10,MAS8) + mtspr SPRN_MAS8,r10 +END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) + + lbz r6,PACASOFTIRQEN(r13) + ld r5,SOFTE(r1) + + /* Interrupts had better not already be enabled... */ + twnei r6,0 + + cmpwi cr0,r5,0 + beq 1f + TRACE_ENABLE_INTS + stb r5,PACASOFTIRQEN(r13) +1: + /* + * Restore PACAIRQHAPPENED rather than setting it based on + * the return MSR[EE], since we could have interrupted + * __check_irq_replay() or other inconsistent transitory + * states that must remain that way. + */ + SPECIAL_EXC_LOAD(r10,IRQHAPPENED) + stb r10,PACAIRQHAPPENED(r13) + + SPECIAL_EXC_LOAD(r10,DEAR) + mtspr SPRN_DEAR,r10 + SPECIAL_EXC_LOAD(r10,ESR) + mtspr SPRN_ESR,r10 + + stdcx. r0,0,r1 /* to clear the reservation */ + + REST_4GPRS(2, r1) + REST_4GPRS(6, r1) + + ld r10,_CTR(r1) + ld r11,_XER(r1) + mtctr r10 + mtxer r11 + + blr + +.macro ret_from_level srr0 srr1 paca_ex scratch + bl ret_from_level_except + + ld r10,_LINK(r1) + ld r11,_CCR(r1) + ld r0,GPR13(r1) + mtlr r10 + mtcr r11 + + ld r10,GPR10(r1) + ld r11,GPR11(r1) + ld r12,GPR12(r1) + mtspr \scratch,r0 + + std r10,\paca_ex+EX_R10(r13); + std r11,\paca_ex+EX_R11(r13); + ld r10,_NIP(r1) + ld r11,_MSR(r1) + ld r0,GPR0(r1) + ld r1,GPR1(r1) + mtspr \srr0,r10 + mtspr \srr1,r11 + ld r10,\paca_ex+EX_R10(r13) + ld r11,\paca_ex+EX_R11(r13) + mfspr r13,\scratch +.endm + +ret_from_crit_except: + ret_from_level SPRN_CSRR0 SPRN_CSRR1 PACA_EXCRIT SPRN_SPRG_CRIT_SCRATCH + rfci + +ret_from_mc_except: + ret_from_level SPRN_MCSRR0 SPRN_MCSRR1 PACA_EXMC SPRN_SPRG_MC_SCRATCH + rfmci /* Exception prolog code for all exceptions */ #define EXCEPTION_PROLOG(n, intnum, type, addition) \ @@ -81,22 +311,19 @@ #define CRIT_SET_KSTACK \ ld r1,PACA_CRIT_STACK(r13); \ - subi r1,r1,SPECIAL_EXC_FRAME_SIZE; \ - EXC_LEVEL_EXCEPTION_PROLOG(CRIT); + subi r1,r1,SPECIAL_EXC_FRAME_SIZE #define SPRN_CRIT_SRR0 SPRN_CSRR0 #define SPRN_CRIT_SRR1 SPRN_CSRR1 #define DBG_SET_KSTACK \ ld r1,PACA_DBG_STACK(r13); \ - subi r1,r1,SPECIAL_EXC_FRAME_SIZE; \ - EXC_LEVEL_EXCEPTION_PROLOG(DBG); + subi r1,r1,SPECIAL_EXC_FRAME_SIZE #define SPRN_DBG_SRR0 SPRN_DSRR0 #define SPRN_DBG_SRR1 SPRN_DSRR1 #define MC_SET_KSTACK \ ld r1,PACA_MC_STACK(r13); \ - subi r1,r1,SPECIAL_EXC_FRAME_SIZE; \ - EXC_LEVEL_EXCEPTION_PROLOG(MC); + subi r1,r1,SPECIAL_EXC_FRAME_SIZE #define SPRN_MC_SRR0 SPRN_MCSRR0 #define SPRN_MC_SRR1 SPRN_MCSRR1 @@ -322,27 +549,25 @@ interrupt_end_book3e: START_EXCEPTION(critical_input); CRIT_EXCEPTION_PROLOG(0x100, BOOKE_INTERRUPT_CRITICAL, PROLOG_ADDITION_NONE) -// EXCEPTION_COMMON_CRIT(0x100) -// INTS_DISABLE -// bl special_reg_save_crit -// CHECK_NAPPING(); -// addi r3,r1,STACK_FRAME_OVERHEAD -// bl .critical_exception -// b ret_from_crit_except - b . + EXCEPTION_COMMON_CRIT(0x100) + bl .save_nvgprs + bl special_reg_save + CHECK_NAPPING(); + addi r3,r1,STACK_FRAME_OVERHEAD + bl .unknown_exception + b ret_from_crit_except /* Machine Check Interrupt */ START_EXCEPTION(machine_check); MC_EXCEPTION_PROLOG(0x000, BOOKE_INTERRUPT_MACHINE_CHECK, PROLOG_ADDITION_NONE) -// EXCEPTION_COMMON_MC(0x000) -// INTS_DISABLE -// bl special_reg_save_mc -// addi r3,r1,STACK_FRAME_OVERHEAD -// CHECK_NAPPING(); -// bl .machine_check_exception -// b ret_from_mc_except - b . + EXCEPTION_COMMON_MC(0x000) + bl .save_nvgprs + bl special_reg_save + CHECK_NAPPING(); + addi r3,r1,STACK_FRAME_OVERHEAD + bl .machine_check_exception + b ret_from_mc_except /* Data Storage Interrupt */ START_EXCEPTION(data_storage) @@ -461,14 +686,17 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) START_EXCEPTION(watchdog); CRIT_EXCEPTION_PROLOG(0x9f0, BOOKE_INTERRUPT_WATCHDOG, PROLOG_ADDITION_NONE) -// EXCEPTION_COMMON_CRIT(0x9f0) -// INTS_DISABLE -// bl special_reg_save_crit -// CHECK_NAPPING(); -// addi r3,r1,STACK_FRAME_OVERHEAD -// bl .unknown_exception -// b ret_from_crit_except - b . + EXCEPTION_COMMON_CRIT(0x9f0) + bl .save_nvgprs + bl special_reg_save + CHECK_NAPPING(); + addi r3,r1,STACK_FRAME_OVERHEAD +#ifdef CONFIG_BOOKE_WDT + bl .WatchdogException +#else + bl .unknown_exception +#endif + b ret_from_crit_except /* System Call Interrupt */ START_EXCEPTION(system_call) @@ -541,7 +769,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) */ mfspr r14,SPRN_DBSR EXCEPTION_COMMON_CRIT(0xd00) - INTS_DISABLE std r14,_DSISR(r1) addi r3,r1,STACK_FRAME_OVERHEAD mr r4,r14 @@ -634,14 +861,13 @@ kernel_dbg_exc: START_EXCEPTION(doorbell_crit); CRIT_EXCEPTION_PROLOG(0x2a0, BOOKE_INTERRUPT_DOORBELL_CRITICAL, PROLOG_ADDITION_NONE) -// EXCEPTION_COMMON_CRIT(0x2a0) -// INTS_DISABLE -// bl special_reg_save_crit -// CHECK_NAPPING(); -// addi r3,r1,STACK_FRAME_OVERHEAD -// bl .doorbell_critical_exception -// b ret_from_crit_except - b . + EXCEPTION_COMMON_CRIT(0x2a0) + bl .save_nvgprs + bl special_reg_save + CHECK_NAPPING(); + addi r3,r1,STACK_FRAME_OVERHEAD + bl .unknown_exception + b ret_from_crit_except /* * Guest doorbell interrupt @@ -661,14 +887,13 @@ kernel_dbg_exc: START_EXCEPTION(guest_doorbell_crit); CRIT_EXCEPTION_PROLOG(0x2e0, BOOKE_INTERRUPT_GUEST_DBELL_CRIT, PROLOG_ADDITION_NONE) -// EXCEPTION_COMMON_CRIT(0x2e0) -// INTS_DISABLE -// bl special_reg_save_crit -// CHECK_NAPPING(); -// addi r3,r1,STACK_FRAME_OVERHEAD -// bl .guest_doorbell_critical_exception -// b ret_from_crit_except - b . + EXCEPTION_COMMON_CRIT(0x2e0) + bl .save_nvgprs + bl special_reg_save + CHECK_NAPPING(); + addi r3,r1,STACK_FRAME_OVERHEAD + bl .unknown_exception + b ret_from_crit_except /* Hypervisor call */ START_EXCEPTION(hypercall); diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c index b37a58e1c92d..ae3d5b799b90 100644 --- a/arch/powerpc/mm/tlb_nohash.c +++ b/arch/powerpc/mm/tlb_nohash.c @@ -144,6 +144,15 @@ int mmu_vmemmap_psize; /* Page size used for the virtual mem map */ int book3e_htw_mode; /* HW tablewalk? Value is PPC_HTW_* */ unsigned long linear_map_top; /* Top of linear mapping */ + +/* + * Number of bytes to add to SPRN_SPRG_TLB_EXFRAME on crit/mcheck/debug + * exceptions. This is used for bolted and e6500 TLB miss handlers which + * do not modify this SPRG in the TLB miss code; for other TLB miss handlers, + * this is set to zero. + */ +int extlb_level_exc; + #endif /* CONFIG_PPC64 */ #ifdef CONFIG_PPC_FSL_BOOK3E @@ -559,6 +568,7 @@ static void setup_mmu_htw(void) break; #ifdef CONFIG_PPC_FSL_BOOK3E case PPC_HTW_E6500: + extlb_level_exc = EX_TLB_SIZE; patch_exception(0x1c0, exc_data_tlb_miss_e6500_book3e); patch_exception(0x1e0, exc_instruction_tlb_miss_e6500_book3e); break; @@ -652,6 +662,7 @@ static void __early_init_mmu(int boot_cpu) memblock_enforce_memory_limit(linear_map_top); if (book3e_htw_mode == PPC_HTW_NONE) { + extlb_level_exc = EX_TLB_SIZE; patch_exception(0x1c0, exc_data_tlb_miss_bolted_book3e); patch_exception(0x1e0, exc_instruction_tlb_miss_bolted_book3e); |