diff options
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/asm-offsets.c | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 35 | ||||
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 49 | ||||
| -rw-r--r-- | arch/powerpc/kernel/idle.c | 4 | ||||
| -rw-r--r-- | arch/powerpc/kernel/idle_6xx.S | 63 | ||||
| -rw-r--r-- | arch/powerpc/kernel/idle_power4.S | 10 | ||||
| -rw-r--r-- | arch/powerpc/kernel/irq.c | 36 | ||||
| -rw-r--r-- | arch/powerpc/kernel/prom_init.c | 5 | ||||
| -rw-r--r-- | arch/powerpc/kernel/rtas-proc.c | 4 |
10 files changed, 123 insertions, 86 deletions
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index 0cc0995b81b0..803858e86160 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -20,7 +20,7 @@ obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \ firmware.o sysfs.o obj-$(CONFIG_PPC64) += vdso64/ obj-$(CONFIG_ALTIVEC) += vecemu.o vector.o -obj-$(CONFIG_POWER4) += idle_power4.o +obj-$(CONFIG_PPC_970_NAP) += idle_power4.o obj-$(CONFIG_PPC_OF) += of_device.o prom_parse.o procfs-$(CONFIG_PPC64) := proc_ppc64.o obj-$(CONFIG_PROC_FS) += $(procfs-y) diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 54b48f330051..8f85c5e8a55a 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -91,6 +91,7 @@ int main(void) #endif /* CONFIG_PPC64 */ DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); + DEFINE(TI_LOCAL_FLAGS, offsetof(struct thread_info, local_flags)); DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count)); DEFINE(TI_TASK, offsetof(struct thread_info, task)); #ifdef CONFIG_PPC32 diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index b3a979467225..8866fd26c6b9 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -128,37 +128,36 @@ transfer_to_handler: stw r12,4(r11) #endif b 3f + 2: /* if from kernel, check interrupted DOZE/NAP mode and * check for stack overflow */ + lwz r9,THREAD_INFO-THREAD(r12) + cmplw r1,r9 /* if r1 <= current->thread_info */ + ble- stack_ovf /* then the kernel stack overflowed */ +5: #ifdef CONFIG_6xx - mfspr r11,SPRN_HID0 - mtcr r11 -BEGIN_FTR_SECTION - bt- 8,4f /* Check DOZE */ -END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE) -BEGIN_FTR_SECTION - bt- 9,4f /* Check NAP */ -END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) + tophys(r9,r9) /* check local flags */ + lwz r12,TI_LOCAL_FLAGS(r9) + mtcrf 0x01,r12 + bt- 31-TLF_NAPPING,4f #endif /* CONFIG_6xx */ .globl transfer_to_handler_cont transfer_to_handler_cont: - lwz r11,THREAD_INFO-THREAD(r12) - cmplw r1,r11 /* if r1 <= current->thread_info */ - ble- stack_ovf /* then the kernel stack overflowed */ 3: mflr r9 lwz r11,0(r9) /* virtual address of handler */ lwz r9,4(r9) /* where to go when done */ - FIX_SRR1(r10,r12) mtspr SPRN_SRR0,r11 mtspr SPRN_SRR1,r10 mtlr r9 SYNC RFI /* jump to handler, enable MMU */ -#ifdef CONFIG_6xx -4: b power_save_6xx_restore +#ifdef CONFIG_6xx +4: rlwinm r12,r12,0,~_TLF_NAPPING + stw r12,TI_LOCAL_FLAGS(r9) + b power_save_6xx_restore #endif /* @@ -167,10 +166,10 @@ transfer_to_handler_cont: */ stack_ovf: /* sometimes we use a statically-allocated stack, which is OK. */ - lis r11,_end@h - ori r11,r11,_end@l - cmplw r1,r11 - ble 3b /* r1 <= &_end is OK */ + lis r12,_end@h + ori r12,r12,_end@l + cmplw r1,r12 + ble 5b /* r1 <= &_end is OK */ SAVE_NVGPRS(r11) addi r3,r1,STACK_FRAME_OVERHEAD lis r1,init_thread_union@ha diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index a5ae04a57c78..b7d140430a41 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -376,11 +376,28 @@ label##_common: \ bl hdlr; \ b .ret_from_except +/* + * Like STD_EXCEPTION_COMMON, but for exceptions that can occur + * in the idle task and therefore need the special idle handling. + */ +#define STD_EXCEPTION_COMMON_IDLE(trap, label, hdlr) \ + .align 7; \ + .globl label##_common; \ +label##_common: \ + EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ + FINISH_NAP; \ + DISABLE_INTS; \ + bl .save_nvgprs; \ + addi r3,r1,STACK_FRAME_OVERHEAD; \ + bl hdlr; \ + b .ret_from_except + #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr) \ .align 7; \ .globl label##_common; \ label##_common: \ EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ + FINISH_NAP; \ DISABLE_INTS; \ bl .ppc64_runlatch_on; \ addi r3,r1,STACK_FRAME_OVERHEAD; \ @@ -388,6 +405,25 @@ label##_common: \ b .ret_from_except_lite /* + * When the idle code in power4_idle puts the CPU into NAP mode, + * it has to do so in a loop, and relies on the external interrupt + * and decrementer interrupt entry code to get it out of the loop. + * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags + * to signal that it is in the loop and needs help to get out. + */ +#ifdef CONFIG_PPC_970_NAP +#define FINISH_NAP \ +BEGIN_FTR_SECTION \ + clrrdi r11,r1,THREAD_SHIFT; \ + ld r9,TI_LOCAL_FLAGS(r11); \ + andi. r10,r9,_TLF_NAPPING; \ + bnel power4_fixup_nap; \ +END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) +#else +#define FINISH_NAP +#endif + +/* * Start of pSeries system interrupt routines */ . = 0x100 @@ -772,6 +808,7 @@ hardware_interrupt_iSeries_masked: .globl machine_check_common machine_check_common: EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) + FINISH_NAP DISABLE_INTS bl .save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD @@ -783,7 +820,7 @@ 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(0xf00, performance_monitor, .performance_monitor_exception) + STD_EXCEPTION_COMMON_IDLE(0xf00, performance_monitor, .performance_monitor_exception) STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception) #ifdef CONFIG_ALTIVEC STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception) @@ -1034,6 +1071,7 @@ unrecov_slb: .globl hardware_interrupt_entry hardware_interrupt_common: EXCEPTION_PROLOG_COMMON(0x500, PACA_EXGEN) + FINISH_NAP hardware_interrupt_entry: DISABLE_INTS bl .ppc64_runlatch_on @@ -1041,6 +1079,15 @@ hardware_interrupt_entry: bl .do_IRQ b .ret_from_except_lite +#ifdef CONFIG_PPC_970_NAP +power4_fixup_nap: + andc r9,r9,r10 + std r9,TI_LOCAL_FLAGS(r11) + ld r10,_LINK(r1) /* make idle task do the */ + std r10,_NIP(r1) /* equivalent of a blr */ + blr +#endif + .align 7 .globl alignment_common alignment_common: diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c index e9f321d74d85..d491052c8e0c 100644 --- a/arch/powerpc/kernel/idle.c +++ b/arch/powerpc/kernel/idle.c @@ -50,9 +50,9 @@ void cpu_idle(void) set_thread_flag(TIF_POLLING_NRFLAG); while (1) { - ppc64_runlatch_off(); - while (!need_resched() && !cpu_should_die()) { + ppc64_runlatch_off(); + if (ppc_md.power_save) { clear_thread_flag(TIF_POLLING_NRFLAG); /* diff --git a/arch/powerpc/kernel/idle_6xx.S b/arch/powerpc/kernel/idle_6xx.S index 12a4efbaa08f..b45fa0e37212 100644 --- a/arch/powerpc/kernel/idle_6xx.S +++ b/arch/powerpc/kernel/idle_6xx.S @@ -22,8 +22,6 @@ #include <asm/ppc_asm.h> #include <asm/asm-offsets.h> -#undef DEBUG - .text /* @@ -109,12 +107,6 @@ BEGIN_FTR_SECTION dcbf 0,r4 dcbf 0,r4 END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR) -#ifdef DEBUG - lis r6,nap_enter_count@ha - lwz r4,nap_enter_count@l(r6) - addi r4,r4,1 - stw r4,nap_enter_count@l(r6) -#endif 2: BEGIN_FTR_SECTION /* Go to low speed mode on some 750FX */ @@ -144,48 +136,42 @@ BEGIN_FTR_SECTION DSSALL sync END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) + rlwinm r9,r1,0,0,31-THREAD_SHIFT /* current thread_info */ + lwz r8,TI_LOCAL_FLAGS(r9) /* set napping bit */ + ori r8,r8,_TLF_NAPPING /* so when we take an exception */ + stw r8,TI_LOCAL_FLAGS(r9) /* it will return to our caller */ mfmsr r7 ori r7,r7,MSR_EE oris r7,r7,MSR_POW@h - sync - isync +1: sync mtmsr r7 isync - sync - blr - + b 1b + /* * Return from NAP/DOZE mode, restore some CPU specific registers, * we are called with DR/IR still off and r2 containing physical - * address of current. + * address of current. R11 points to the exception frame (physical + * address). We have to preserve r10. */ _GLOBAL(power_save_6xx_restore) - mfspr r11,SPRN_HID0 - rlwinm. r11,r11,0,10,8 /* Clear NAP & copy NAP bit !state to cr1 EQ */ - cror 4*cr1+eq,4*cr0+eq,4*cr0+eq -BEGIN_FTR_SECTION - rlwinm r11,r11,0,9,7 /* Clear DOZE */ -END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE) - mtspr SPRN_HID0, r11 + lwz r9,_LINK(r11) /* interrupted in ppc6xx_idle: */ + stw r9,_NIP(r11) /* make it do a blr */ -#ifdef DEBUG - beq cr1,1f - lis r11,(nap_return_count-KERNELBASE)@ha - lwz r9,nap_return_count@l(r11) - addi r9,r9,1 - stw r9,nap_return_count@l(r11) -1: -#endif - - rlwinm r9,r1,0,0,18 - tophys(r9,r9) - lwz r11,TI_CPU(r9) +#ifdef CONFIG_SMP + mfspr r12,SPRN_SPRG3 + lwz r11,TI_CPU(r12) /* get cpu number * 4 */ slwi r11,r11,2 +#else + li r11,0 +#endif /* Todo make sure all these are in the same page - * and load r22 (@ha part + CPU offset) only once + * and load r11 (@ha part + CPU offset) only once */ BEGIN_FTR_SECTION - beq cr1,1f + mfspr r9,SPRN_HID0 + andis. r9,r9,HID0_NAP@h + beq 1f addis r9,r11,(nap_save_msscr0-KERNELBASE)@ha lwz r9,nap_save_msscr0@l(r9) mtspr SPRN_MSSCR0, r9 @@ -210,10 +196,3 @@ _GLOBAL(nap_save_hid1) _GLOBAL(powersave_lowspeed) .long 0 - -#ifdef DEBUG -_GLOBAL(nap_enter_count) - .space 4 -_GLOBAL(nap_return_count) - .space 4 -#endif diff --git a/arch/powerpc/kernel/idle_power4.S b/arch/powerpc/kernel/idle_power4.S index 6dad1c02496e..d85c7c938eed 100644 --- a/arch/powerpc/kernel/idle_power4.S +++ b/arch/powerpc/kernel/idle_power4.S @@ -35,12 +35,16 @@ BEGIN_FTR_SECTION DSSALL sync END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) + clrrdi r9,r1,THREAD_SHIFT /* current thread_info */ + ld r8,TI_LOCAL_FLAGS(r9) /* set napping bit */ + ori r8,r8,_TLF_NAPPING /* so when we take an exception */ + std r8,TI_LOCAL_FLAGS(r9) /* it will return to our caller */ mfmsr r7 ori r7,r7,MSR_EE oris r7,r7,MSR_POW@h - sync +1: sync isync mtmsrd r7 isync - sync - blr + b 1b + diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index bb5c9501234c..57d560c68897 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -272,18 +272,26 @@ unsigned int virt_irq_to_real_map[NR_IRQS]; * Don't use virtual irqs 0, 1, 2 for devices. * The pcnet32 driver considers interrupt numbers < 2 to be invalid, * and 2 is the XICS IPI interrupt. - * We limit virtual irqs to 17 less than NR_IRQS so that when we - * offset them by 16 (to reserve the first 16 for ISA interrupts) - * we don't end up with an interrupt number >= NR_IRQS. + * We limit virtual irqs to __irq_offet_value less than virt_irq_max so + * that when we offset them we don't end up with an interrupt + * number >= virt_irq_max. */ #define MIN_VIRT_IRQ 3 -#define MAX_VIRT_IRQ (NR_IRQS - NUM_ISA_INTERRUPTS - 1) -#define NR_VIRT_IRQS (MAX_VIRT_IRQ - MIN_VIRT_IRQ + 1) + +unsigned int virt_irq_max; +static unsigned int max_virt_irq; +static unsigned int nr_virt_irqs; void virt_irq_init(void) { int i; + + if ((virt_irq_max == 0) || (virt_irq_max > (NR_IRQS - 1))) + virt_irq_max = NR_IRQS - 1; + max_virt_irq = virt_irq_max - __irq_offset_value; + nr_virt_irqs = max_virt_irq - MIN_VIRT_IRQ + 1; + for (i = 0; i < NR_IRQS; i++) virt_irq_to_real_map[i] = UNDEFINED_IRQ; } @@ -308,17 +316,17 @@ int virt_irq_create_mapping(unsigned int real_irq) return real_irq; } - /* map to a number between MIN_VIRT_IRQ and MAX_VIRT_IRQ */ + /* map to a number between MIN_VIRT_IRQ and max_virt_irq */ virq = real_irq; - if (virq > MAX_VIRT_IRQ) - virq = (virq % NR_VIRT_IRQS) + MIN_VIRT_IRQ; + if (virq > max_virt_irq) + virq = (virq % nr_virt_irqs) + MIN_VIRT_IRQ; /* search for this number or a free slot */ first_virq = virq; while (virt_irq_to_real_map[virq] != UNDEFINED_IRQ) { if (virt_irq_to_real_map[virq] == real_irq) return virq; - if (++virq > MAX_VIRT_IRQ) + if (++virq > max_virt_irq) virq = MIN_VIRT_IRQ; if (virq == first_virq) goto nospace; /* oops, no free slots */ @@ -330,8 +338,8 @@ int virt_irq_create_mapping(unsigned int real_irq) nospace: if (!warned) { printk(KERN_CRIT "Interrupt table is full\n"); - printk(KERN_CRIT "Increase NR_IRQS (currently %d) " - "in your kernel sources and rebuild.\n", NR_IRQS); + printk(KERN_CRIT "Increase virt_irq_max (currently %d) " + "in your kernel sources and rebuild.\n", virt_irq_max); warned = 1; } return NO_IRQ; @@ -349,8 +357,8 @@ unsigned int real_irq_to_virt_slowpath(unsigned int real_irq) virq = real_irq; - if (virq > MAX_VIRT_IRQ) - virq = (virq % NR_VIRT_IRQS) + MIN_VIRT_IRQ; + if (virq > max_virt_irq) + virq = (virq % nr_virt_irqs) + MIN_VIRT_IRQ; first_virq = virq; @@ -360,7 +368,7 @@ unsigned int real_irq_to_virt_slowpath(unsigned int real_irq) virq++; - if (virq >= MAX_VIRT_IRQ) + if (virq >= max_virt_irq) virq = 0; } while (first_virq != virq); diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index d66c5e77fcff..7e4d54821a07 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -1528,12 +1528,11 @@ static int __init prom_find_machine_type(void) * non-IBM designs ! * - it has /rtas */ - len = prom_getprop(_prom->root, "model", + len = prom_getprop(_prom->root, "device_type", compat, sizeof(compat)-1); if (len <= 0) return PLATFORM_GENERIC; - compat[len] = 0; - if (strcmp(compat, "chrp")) + if (strncmp(compat, RELOC("chrp"), 4)) return PLATFORM_GENERIC; /* Default to pSeries. We need to know if we are running LPAR */ diff --git a/arch/powerpc/kernel/rtas-proc.c b/arch/powerpc/kernel/rtas-proc.c index 456286cf1d14..9c9ad1fa9cce 100644 --- a/arch/powerpc/kernel/rtas-proc.c +++ b/arch/powerpc/kernel/rtas-proc.c @@ -258,11 +258,11 @@ static int __init proc_rtas_init(void) struct proc_dir_entry *entry; if (!machine_is(pseries)) - return 1; + return -ENODEV; rtas_node = of_find_node_by_name(NULL, "rtas"); if (rtas_node == NULL) - return 1; + return -ENODEV; entry = create_proc_entry("ppc64/rtas/progress", S_IRUGO|S_IWUSR, NULL); if (entry) |
