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Message-Id: <1464095714-48772-4-git-send-email-shreyas@linux.vnet.ibm.com> Date: Tue, 24 May 2016 18:45:07 +0530 From: "Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com> To: mpe@...erman.id.au Cc: linuxppc-dev@...ts.ozlabs.org, paulus@...abs.org, linux-kernel@...r.kernel.org, mikey@...ling.org, ego@...ux.vnet.ibm.com, maddy@...ux.vnet.ibm.com, "Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com> Subject: [PATCH v4 03/10] powerpc/powernv: Rename idle_power7.S to idle_power_common.S idle_power7.S handles idle entry/exit for POWER7, POWER8 and in next patch for POWER9. Rename the file to a non-hardware specific name. Reviewed-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com> Signed-off-by: Shreyas B. Prabhu <shreyas@...ux.vnet.ibm.com> --- - No changes in v4 Changes in v3: ============== - Instead of moving few common functions from idle_power7.S to idle_power_common.S, renaming idle_power7.S to idle_power_common.S arch/powerpc/kernel/Makefile | 2 +- arch/powerpc/kernel/idle_power7.S | 527 -------------------------------- arch/powerpc/kernel/idle_power_common.S | 527 ++++++++++++++++++++++++++++++++ 3 files changed, 528 insertions(+), 528 deletions(-) delete mode 100644 arch/powerpc/kernel/idle_power7.S create mode 100644 arch/powerpc/kernel/idle_power_common.S diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index 2da380f..99116da 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -47,7 +47,7 @@ obj-$(CONFIG_PPC_BOOK3E_64) += exceptions-64e.o idle_book3e.o obj-$(CONFIG_PPC64) += vdso64/ obj-$(CONFIG_ALTIVEC) += vecemu.o obj-$(CONFIG_PPC_970_NAP) += idle_power4.o -obj-$(CONFIG_PPC_P7_NAP) += idle_power7.o +obj-$(CONFIG_PPC_P7_NAP) += idle_power_common.o procfs-y := proc_powerpc.o obj-$(CONFIG_PROC_FS) += $(procfs-y) rtaspci-$(CONFIG_PPC64)-$(CONFIG_PCI) := rtas_pci.o diff --git a/arch/powerpc/kernel/idle_power7.S b/arch/powerpc/kernel/idle_power7.S deleted file mode 100644 index d5def06..0000000 --- a/arch/powerpc/kernel/idle_power7.S +++ /dev/null @@ -1,527 +0,0 @@ -/* - * This file contains the power_save function for Power7 CPUs. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#include <linux/threads.h> -#include <asm/processor.h> -#include <asm/page.h> -#include <asm/cputable.h> -#include <asm/thread_info.h> -#include <asm/ppc_asm.h> -#include <asm/asm-offsets.h> -#include <asm/ppc-opcode.h> -#include <asm/hw_irq.h> -#include <asm/kvm_book3s_asm.h> -#include <asm/opal.h> -#include <asm/cpuidle.h> -#include <asm/book3s/64/mmu-hash.h> - -#undef DEBUG - -/* - * Use unused space in the interrupt stack to save and restore - * registers for winkle support. - */ -#define _SDR1 GPR3 -#define _RPR GPR4 -#define _SPURR GPR5 -#define _PURR GPR6 -#define _TSCR GPR7 -#define _DSCR GPR8 -#define _AMOR GPR9 -#define _WORT GPR10 -#define _WORC GPR11 - -/* Idle state entry routines */ - -#define IDLE_STATE_ENTER_SEQ(IDLE_INST) \ - /* Magic NAP/SLEEP/WINKLE mode enter sequence */ \ - std r0,0(r1); \ - ptesync; \ - ld r0,0(r1); \ -1: cmp cr0,r0,r0; \ - bne 1b; \ - IDLE_INST; \ - b . - - .text - -/* - * Used by threads when the lock bit of core_idle_state is set. - * Threads will spin in HMT_LOW until the lock bit is cleared. - * r14 - pointer to core_idle_state - * r15 - used to load contents of core_idle_state - */ - -core_idle_lock_held: - HMT_LOW -3: lwz r15,0(r14) - andi. r15,r15,PNV_CORE_IDLE_LOCK_BIT - bne 3b - HMT_MEDIUM - lwarx r15,0,r14 - blr - -/* - * Pass requested state in r3: - * r3 - PNV_THREAD_NAP/SLEEP/WINKLE - * - * To check IRQ_HAPPENED in r4 - * 0 - don't check - * 1 - check - */ -_GLOBAL(power7_powersave_common) - /* Use r3 to pass state nap/sleep/winkle */ - /* NAP is a state loss, we create a regs frame on the - * stack, fill it up with the state we care about and - * stick a pointer to it in PACAR1. We really only - * need to save PC, some CR bits and the NV GPRs, - * but for now an interrupt frame will do. - */ - mflr r0 - std r0,16(r1) - stdu r1,-INT_FRAME_SIZE(r1) - std r0,_LINK(r1) - std r0,_NIP(r1) - - /* Hard disable interrupts */ - mfmsr r9 - rldicl r9,r9,48,1 - rotldi r9,r9,16 - mtmsrd r9,1 /* hard-disable interrupts */ - - /* Check if something happened while soft-disabled */ - lbz r0,PACAIRQHAPPENED(r13) - andi. r0,r0,~PACA_IRQ_HARD_DIS@l - beq 1f - cmpwi cr0,r4,0 - beq 1f - addi r1,r1,INT_FRAME_SIZE - ld r0,16(r1) - li r3,0 /* Return 0 (no nap) */ - mtlr r0 - blr - -1: /* We mark irqs hard disabled as this is the state we'll - * be in when returning and we need to tell arch_local_irq_restore() - * about it - */ - li r0,PACA_IRQ_HARD_DIS - stb r0,PACAIRQHAPPENED(r13) - - /* We haven't lost state ... yet */ - li r0,0 - stb r0,PACA_NAPSTATELOST(r13) - - /* Continue saving state */ - SAVE_GPR(2, r1) - SAVE_NVGPRS(r1) - mfcr r4 - std r4,_CCR(r1) - std r9,_MSR(r1) - std r1,PACAR1(r13) - - /* - * Go to real mode to do the nap, as required by the architecture. - * Also, we need to be in real mode before setting hwthread_state, - * because as soon as we do that, another thread can switch - * the MMU context to the guest. - */ - LOAD_REG_IMMEDIATE(r5, MSR_IDLE) - li r6, MSR_RI - andc r6, r9, r6 - LOAD_REG_ADDR(r7, power7_enter_nap_mode) - mtmsrd r6, 1 /* clear RI before setting SRR0/1 */ - mtspr SPRN_SRR0, r7 - mtspr SPRN_SRR1, r5 - rfid - - .globl power7_enter_nap_mode -power7_enter_nap_mode: -#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE - /* Tell KVM we're napping */ - li r4,KVM_HWTHREAD_IN_NAP - stb r4,HSTATE_HWTHREAD_STATE(r13) -#endif - stb r3,PACA_THREAD_IDLE_STATE(r13) - cmpwi cr3,r3,PNV_THREAD_SLEEP - bge cr3,2f - IDLE_STATE_ENTER_SEQ(PPC_NAP) - /* No return */ -2: - /* Sleep or winkle */ - lbz r7,PACA_THREAD_MASK(r13) - ld r14,PACA_CORE_IDLE_STATE_PTR(r13) -lwarx_loop1: - lwarx r15,0,r14 - - andi. r9,r15,PNV_CORE_IDLE_LOCK_BIT - bnel core_idle_lock_held - - andc r15,r15,r7 /* Clear thread bit */ - - andi. r15,r15,PNV_CORE_IDLE_THREAD_BITS - -/* - * If cr0 = 0, then current thread is the last thread of the core entering - * sleep. Last thread needs to execute the hardware bug workaround code if - * required by the platform. - * Make the workaround call unconditionally here. The below branch call is - * patched out when the idle states are discovered if the platform does not - * require it. - */ -.global pnv_fastsleep_workaround_at_entry -pnv_fastsleep_workaround_at_entry: - beq fastsleep_workaround_at_entry - - stwcx. r15,0,r14 - bne- lwarx_loop1 - isync - -common_enter: /* common code for all the threads entering sleep or winkle */ - bgt cr3,enter_winkle - IDLE_STATE_ENTER_SEQ(PPC_SLEEP) - -fastsleep_workaround_at_entry: - ori r15,r15,PNV_CORE_IDLE_LOCK_BIT - stwcx. r15,0,r14 - bne- lwarx_loop1 - isync - - /* Fast sleep workaround */ - li r3,1 - li r4,1 - li r0,OPAL_CONFIG_CPU_IDLE_STATE - bl opal_call_realmode - - /* Clear Lock bit */ - li r0,0 - lwsync - stw r0,0(r14) - b common_enter - -enter_winkle: - /* - * Note all register i.e per-core, per-subcore or per-thread is saved - * here since any thread in the core might wake up first - */ - mfspr r3,SPRN_SDR1 - std r3,_SDR1(r1) - mfspr r3,SPRN_RPR - std r3,_RPR(r1) - mfspr r3,SPRN_SPURR - std r3,_SPURR(r1) - mfspr r3,SPRN_PURR - std r3,_PURR(r1) - mfspr r3,SPRN_TSCR - std r3,_TSCR(r1) - mfspr r3,SPRN_DSCR - std r3,_DSCR(r1) - mfspr r3,SPRN_AMOR - std r3,_AMOR(r1) - mfspr r3,SPRN_WORT - std r3,_WORT(r1) - mfspr r3,SPRN_WORC - std r3,_WORC(r1) - IDLE_STATE_ENTER_SEQ(PPC_WINKLE) - -_GLOBAL(power7_idle) - /* Now check if user or arch enabled NAP mode */ - LOAD_REG_ADDRBASE(r3,powersave_nap) - lwz r4,ADDROFF(powersave_nap)(r3) - cmpwi 0,r4,0 - beqlr - li r3, 1 - /* fall through */ - -_GLOBAL(power7_nap) - mr r4,r3 - li r3,PNV_THREAD_NAP - b power7_powersave_common - /* No return */ - -_GLOBAL(power7_sleep) - li r3,PNV_THREAD_SLEEP - li r4,1 - b power7_powersave_common - /* No return */ - -_GLOBAL(power7_winkle) - li r3,PNV_THREAD_WINKLE - li r4,1 - b power7_powersave_common - /* No return */ - -#define CHECK_HMI_INTERRUPT \ - mfspr r0,SPRN_SRR1; \ -BEGIN_FTR_SECTION_NESTED(66); \ - rlwinm r0,r0,45-31,0xf; /* extract wake reason field (P8) */ \ -FTR_SECTION_ELSE_NESTED(66); \ - rlwinm r0,r0,45-31,0xe; /* P7 wake reason field is 3 bits */ \ -ALT_FTR_SECTION_END_NESTED_IFSET(CPU_FTR_ARCH_207S, 66); \ - cmpwi r0,0xa; /* Hypervisor maintenance ? */ \ - bne 20f; \ - /* Invoke opal call to handle hmi */ \ - ld r2,PACATOC(r13); \ - ld r1,PACAR1(r13); \ - std r3,ORIG_GPR3(r1); /* Save original r3 */ \ - li r0,OPAL_HANDLE_HMI; /* Pass opal token argument*/ \ - bl opal_call_realmode; \ - ld r3,ORIG_GPR3(r1); /* Restore original r3 */ \ -20: nop; - - -/* - * Called from reset vector. Check whether we have woken up with - * hypervisor state loss. If yes, restore hypervisor state and return - * back to reset vector. - * - * r13 - Contents of HSPRG0 - * cr3 - set to gt if waking up with partial/complete hypervisor state loss - */ -_GLOBAL(power7_restore_hyp_resource) - /* - * Check if last bit of HSPGR0 is set. This indicates whether we are - * waking up from winkle. - */ - clrldi r5,r13,63 - clrrdi r13,r13,1 - cmpwi cr4,r5,1 - mtspr SPRN_HSPRG0,r13 - - lbz r0,PACA_THREAD_IDLE_STATE(r13) - cmpwi cr2,r0,PNV_THREAD_NAP - bgt cr2,power7_wakeup_tb_loss /* Either sleep or Winkle */ - - /* - * We fall through here if PACA_THREAD_IDLE_STATE shows we are waking - * up from nap. At this stage CR3 shouldn't contains 'gt' since that - * indicates we are waking with hypervisor state loss from nap. - */ - bgt cr3,. - - blr /* Return back to System Reset vector from where - power7_restore_hyp_resource was invoked */ - - -_GLOBAL(power7_wakeup_tb_loss) - ld r2,PACATOC(r13); - ld r1,PACAR1(r13) - /* - * Before entering any idle state, the NVGPRs are saved in the stack - * and they are restored before switching to the process context. Hence - * until they are restored, they are free to be used. - * - * Save SRR1 and LR in NVGPRs as they might be clobbered in - * opal_call_realmode (called in CHECK_HMI_INTERRUPT). SRR1 is required - * to determine the wakeup reason if we branch to kvm_start_guest. LR - * is required to return back to reset vector after hypervisor state - * restore is complete. - */ - mflr r17 - mfspr r16,SPRN_SRR1 -BEGIN_FTR_SECTION - CHECK_HMI_INTERRUPT -END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) - - lbz r7,PACA_THREAD_MASK(r13) - ld r14,PACA_CORE_IDLE_STATE_PTR(r13) -lwarx_loop2: - lwarx r15,0,r14 - andi. r9,r15,PNV_CORE_IDLE_LOCK_BIT - /* - * Lock bit is set in one of the 2 cases- - * a. In the sleep/winkle enter path, the last thread is executing - * fastsleep workaround code. - * b. In the wake up path, another thread is executing fastsleep - * workaround undo code or resyncing timebase or restoring context - * In either case loop until the lock bit is cleared. - */ - bnel core_idle_lock_held - - cmpwi cr2,r15,0 - lbz r4,PACA_SUBCORE_SIBLING_MASK(r13) - and r4,r4,r15 - cmpwi cr1,r4,0 /* Check if first in subcore */ - - /* - * At this stage - * cr1 - 0b0100 if first thread to wakeup in subcore - * cr2 - 0b0100 if first thread to wakeup in core - * cr3- 0b0010 if waking up from sleep or winkle - * cr4 - 0b0100 if waking up from winkle - */ - - or r15,r15,r7 /* Set thread bit */ - - beq cr1,first_thread_in_subcore - - /* Not first thread in subcore to wake up */ - stwcx. r15,0,r14 - bne- lwarx_loop2 - isync - b common_exit - -first_thread_in_subcore: - /* First thread in subcore to wakeup */ - ori r15,r15,PNV_CORE_IDLE_LOCK_BIT - stwcx. r15,0,r14 - bne- lwarx_loop2 - isync - - /* - * If waking up from sleep, subcore state is not lost. Hence - * skip subcore state restore - */ - bne cr4,subcore_state_restored - - /* Restore per-subcore state */ - ld r4,_SDR1(r1) - mtspr SPRN_SDR1,r4 - ld r4,_RPR(r1) - mtspr SPRN_RPR,r4 - ld r4,_AMOR(r1) - mtspr SPRN_AMOR,r4 - -subcore_state_restored: - /* - * Check if the thread is also the first thread in the core. If not, - * skip to clear_lock. - */ - bne cr2,clear_lock - -first_thread_in_core: - - /* - * First thread in the core waking up from fastsleep. It needs to - * call the fastsleep workaround code if the platform requires it. - * Call it unconditionally here. The below branch instruction will - * be patched out when the idle states are discovered if platform - * does not require workaround. - */ -.global pnv_fastsleep_workaround_at_exit -pnv_fastsleep_workaround_at_exit: - b fastsleep_workaround_at_exit - -timebase_resync: - /* Do timebase resync if we are waking up from sleep. Use cr3 value - * set in exceptions-64s.S */ - ble cr3,clear_lock - /* Time base re-sync */ - li r0,OPAL_RESYNC_TIMEBASE - bl opal_call_realmode; - /* TODO: Check r3 for failure */ - - /* - * If waking up from sleep, per core state is not lost, skip to - * clear_lock. - */ - bne cr4,clear_lock - - /* Restore per core state */ - ld r4,_TSCR(r1) - mtspr SPRN_TSCR,r4 - ld r4,_WORC(r1) - mtspr SPRN_WORC,r4 - -clear_lock: - andi. r15,r15,PNV_CORE_IDLE_THREAD_BITS - lwsync - stw r15,0(r14) - -common_exit: - /* - * Common to all threads. - * - * If waking up from sleep, hypervisor state is not lost. Hence - * skip hypervisor state restore. - */ - bne cr4,hypervisor_state_restored - - /* Waking up from winkle */ - - /* Restore per thread state */ - bl __restore_cpu_power8 - - /* Restore SLB from PACA */ - ld r8,PACA_SLBSHADOWPTR(r13) - - .rept SLB_NUM_BOLTED - li r3, SLBSHADOW_SAVEAREA - LDX_BE r5, r8, r3 - addi r3, r3, 8 - LDX_BE r6, r8, r3 - andis. r7,r5,SLB_ESID_V@h - beq 1f - slbmte r6,r5 -1: addi r8,r8,16 - .endr - - ld r4,_SPURR(r1) - mtspr SPRN_SPURR,r4 - ld r4,_PURR(r1) - mtspr SPRN_PURR,r4 - ld r4,_DSCR(r1) - mtspr SPRN_DSCR,r4 - ld r4,_WORT(r1) - mtspr SPRN_WORT,r4 - -hypervisor_state_restored: - - mtspr SPRN_SRR1,r16 - mtlr r17 - blr /* Return back to System Reset vector from where - power7_restore_hyp_resource was invoked */ - -fastsleep_workaround_at_exit: - li r3,1 - li r4,0 - li r0,OPAL_CONFIG_CPU_IDLE_STATE - bl opal_call_realmode - b timebase_resync - -/* - * R3 here contains the value that will be returned to the caller - * of power7_nap. - */ -_GLOBAL(power7_wakeup_loss) - ld r1,PACAR1(r13) -BEGIN_FTR_SECTION - CHECK_HMI_INTERRUPT -END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) - REST_NVGPRS(r1) - REST_GPR(2, r1) - ld r6,_CCR(r1) - ld r4,_MSR(r1) - ld r5,_NIP(r1) - addi r1,r1,INT_FRAME_SIZE - mtcr r6 - mtspr SPRN_SRR1,r4 - mtspr SPRN_SRR0,r5 - rfid - -/* - * R3 here contains the value that will be returned to the caller - * of power7_nap. - */ -_GLOBAL(power7_wakeup_noloss) - lbz r0,PACA_NAPSTATELOST(r13) - cmpwi r0,0 - bne power7_wakeup_loss -BEGIN_FTR_SECTION - CHECK_HMI_INTERRUPT -END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) - ld r1,PACAR1(r13) - ld r6,_CCR(r1) - ld r4,_MSR(r1) - ld r5,_NIP(r1) - addi r1,r1,INT_FRAME_SIZE - mtcr r6 - mtspr SPRN_SRR1,r4 - mtspr SPRN_SRR0,r5 - rfid diff --git a/arch/powerpc/kernel/idle_power_common.S b/arch/powerpc/kernel/idle_power_common.S new file mode 100644 index 0000000..d5def06 --- /dev/null +++ b/arch/powerpc/kernel/idle_power_common.S @@ -0,0 +1,527 @@ +/* + * This file contains the power_save function for Power7 CPUs. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/threads.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/cputable.h> +#include <asm/thread_info.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ppc-opcode.h> +#include <asm/hw_irq.h> +#include <asm/kvm_book3s_asm.h> +#include <asm/opal.h> +#include <asm/cpuidle.h> +#include <asm/book3s/64/mmu-hash.h> + +#undef DEBUG + +/* + * Use unused space in the interrupt stack to save and restore + * registers for winkle support. + */ +#define _SDR1 GPR3 +#define _RPR GPR4 +#define _SPURR GPR5 +#define _PURR GPR6 +#define _TSCR GPR7 +#define _DSCR GPR8 +#define _AMOR GPR9 +#define _WORT GPR10 +#define _WORC GPR11 + +/* Idle state entry routines */ + +#define IDLE_STATE_ENTER_SEQ(IDLE_INST) \ + /* Magic NAP/SLEEP/WINKLE mode enter sequence */ \ + std r0,0(r1); \ + ptesync; \ + ld r0,0(r1); \ +1: cmp cr0,r0,r0; \ + bne 1b; \ + IDLE_INST; \ + b . + + .text + +/* + * Used by threads when the lock bit of core_idle_state is set. + * Threads will spin in HMT_LOW until the lock bit is cleared. + * r14 - pointer to core_idle_state + * r15 - used to load contents of core_idle_state + */ + +core_idle_lock_held: + HMT_LOW +3: lwz r15,0(r14) + andi. r15,r15,PNV_CORE_IDLE_LOCK_BIT + bne 3b + HMT_MEDIUM + lwarx r15,0,r14 + blr + +/* + * Pass requested state in r3: + * r3 - PNV_THREAD_NAP/SLEEP/WINKLE + * + * To check IRQ_HAPPENED in r4 + * 0 - don't check + * 1 - check + */ +_GLOBAL(power7_powersave_common) + /* Use r3 to pass state nap/sleep/winkle */ + /* NAP is a state loss, we create a regs frame on the + * stack, fill it up with the state we care about and + * stick a pointer to it in PACAR1. We really only + * need to save PC, some CR bits and the NV GPRs, + * but for now an interrupt frame will do. + */ + mflr r0 + std r0,16(r1) + stdu r1,-INT_FRAME_SIZE(r1) + std r0,_LINK(r1) + std r0,_NIP(r1) + + /* Hard disable interrupts */ + mfmsr r9 + rldicl r9,r9,48,1 + rotldi r9,r9,16 + mtmsrd r9,1 /* hard-disable interrupts */ + + /* Check if something happened while soft-disabled */ + lbz r0,PACAIRQHAPPENED(r13) + andi. r0,r0,~PACA_IRQ_HARD_DIS@l + beq 1f + cmpwi cr0,r4,0 + beq 1f + addi r1,r1,INT_FRAME_SIZE + ld r0,16(r1) + li r3,0 /* Return 0 (no nap) */ + mtlr r0 + blr + +1: /* We mark irqs hard disabled as this is the state we'll + * be in when returning and we need to tell arch_local_irq_restore() + * about it + */ + li r0,PACA_IRQ_HARD_DIS + stb r0,PACAIRQHAPPENED(r13) + + /* We haven't lost state ... yet */ + li r0,0 + stb r0,PACA_NAPSTATELOST(r13) + + /* Continue saving state */ + SAVE_GPR(2, r1) + SAVE_NVGPRS(r1) + mfcr r4 + std r4,_CCR(r1) + std r9,_MSR(r1) + std r1,PACAR1(r13) + + /* + * Go to real mode to do the nap, as required by the architecture. + * Also, we need to be in real mode before setting hwthread_state, + * because as soon as we do that, another thread can switch + * the MMU context to the guest. + */ + LOAD_REG_IMMEDIATE(r5, MSR_IDLE) + li r6, MSR_RI + andc r6, r9, r6 + LOAD_REG_ADDR(r7, power7_enter_nap_mode) + mtmsrd r6, 1 /* clear RI before setting SRR0/1 */ + mtspr SPRN_SRR0, r7 + mtspr SPRN_SRR1, r5 + rfid + + .globl power7_enter_nap_mode +power7_enter_nap_mode: +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + /* Tell KVM we're napping */ + li r4,KVM_HWTHREAD_IN_NAP + stb r4,HSTATE_HWTHREAD_STATE(r13) +#endif + stb r3,PACA_THREAD_IDLE_STATE(r13) + cmpwi cr3,r3,PNV_THREAD_SLEEP + bge cr3,2f + IDLE_STATE_ENTER_SEQ(PPC_NAP) + /* No return */ +2: + /* Sleep or winkle */ + lbz r7,PACA_THREAD_MASK(r13) + ld r14,PACA_CORE_IDLE_STATE_PTR(r13) +lwarx_loop1: + lwarx r15,0,r14 + + andi. r9,r15,PNV_CORE_IDLE_LOCK_BIT + bnel core_idle_lock_held + + andc r15,r15,r7 /* Clear thread bit */ + + andi. r15,r15,PNV_CORE_IDLE_THREAD_BITS + +/* + * If cr0 = 0, then current thread is the last thread of the core entering + * sleep. Last thread needs to execute the hardware bug workaround code if + * required by the platform. + * Make the workaround call unconditionally here. The below branch call is + * patched out when the idle states are discovered if the platform does not + * require it. + */ +.global pnv_fastsleep_workaround_at_entry +pnv_fastsleep_workaround_at_entry: + beq fastsleep_workaround_at_entry + + stwcx. r15,0,r14 + bne- lwarx_loop1 + isync + +common_enter: /* common code for all the threads entering sleep or winkle */ + bgt cr3,enter_winkle + IDLE_STATE_ENTER_SEQ(PPC_SLEEP) + +fastsleep_workaround_at_entry: + ori r15,r15,PNV_CORE_IDLE_LOCK_BIT + stwcx. r15,0,r14 + bne- lwarx_loop1 + isync + + /* Fast sleep workaround */ + li r3,1 + li r4,1 + li r0,OPAL_CONFIG_CPU_IDLE_STATE + bl opal_call_realmode + + /* Clear Lock bit */ + li r0,0 + lwsync + stw r0,0(r14) + b common_enter + +enter_winkle: + /* + * Note all register i.e per-core, per-subcore or per-thread is saved + * here since any thread in the core might wake up first + */ + mfspr r3,SPRN_SDR1 + std r3,_SDR1(r1) + mfspr r3,SPRN_RPR + std r3,_RPR(r1) + mfspr r3,SPRN_SPURR + std r3,_SPURR(r1) + mfspr r3,SPRN_PURR + std r3,_PURR(r1) + mfspr r3,SPRN_TSCR + std r3,_TSCR(r1) + mfspr r3,SPRN_DSCR + std r3,_DSCR(r1) + mfspr r3,SPRN_AMOR + std r3,_AMOR(r1) + mfspr r3,SPRN_WORT + std r3,_WORT(r1) + mfspr r3,SPRN_WORC + std r3,_WORC(r1) + IDLE_STATE_ENTER_SEQ(PPC_WINKLE) + +_GLOBAL(power7_idle) + /* Now check if user or arch enabled NAP mode */ + LOAD_REG_ADDRBASE(r3,powersave_nap) + lwz r4,ADDROFF(powersave_nap)(r3) + cmpwi 0,r4,0 + beqlr + li r3, 1 + /* fall through */ + +_GLOBAL(power7_nap) + mr r4,r3 + li r3,PNV_THREAD_NAP + b power7_powersave_common + /* No return */ + +_GLOBAL(power7_sleep) + li r3,PNV_THREAD_SLEEP + li r4,1 + b power7_powersave_common + /* No return */ + +_GLOBAL(power7_winkle) + li r3,PNV_THREAD_WINKLE + li r4,1 + b power7_powersave_common + /* No return */ + +#define CHECK_HMI_INTERRUPT \ + mfspr r0,SPRN_SRR1; \ +BEGIN_FTR_SECTION_NESTED(66); \ + rlwinm r0,r0,45-31,0xf; /* extract wake reason field (P8) */ \ +FTR_SECTION_ELSE_NESTED(66); \ + rlwinm r0,r0,45-31,0xe; /* P7 wake reason field is 3 bits */ \ +ALT_FTR_SECTION_END_NESTED_IFSET(CPU_FTR_ARCH_207S, 66); \ + cmpwi r0,0xa; /* Hypervisor maintenance ? */ \ + bne 20f; \ + /* Invoke opal call to handle hmi */ \ + ld r2,PACATOC(r13); \ + ld r1,PACAR1(r13); \ + std r3,ORIG_GPR3(r1); /* Save original r3 */ \ + li r0,OPAL_HANDLE_HMI; /* Pass opal token argument*/ \ + bl opal_call_realmode; \ + ld r3,ORIG_GPR3(r1); /* Restore original r3 */ \ +20: nop; + + +/* + * Called from reset vector. Check whether we have woken up with + * hypervisor state loss. If yes, restore hypervisor state and return + * back to reset vector. + * + * r13 - Contents of HSPRG0 + * cr3 - set to gt if waking up with partial/complete hypervisor state loss + */ +_GLOBAL(power7_restore_hyp_resource) + /* + * Check if last bit of HSPGR0 is set. This indicates whether we are + * waking up from winkle. + */ + clrldi r5,r13,63 + clrrdi r13,r13,1 + cmpwi cr4,r5,1 + mtspr SPRN_HSPRG0,r13 + + lbz r0,PACA_THREAD_IDLE_STATE(r13) + cmpwi cr2,r0,PNV_THREAD_NAP + bgt cr2,power7_wakeup_tb_loss /* Either sleep or Winkle */ + + /* + * We fall through here if PACA_THREAD_IDLE_STATE shows we are waking + * up from nap. At this stage CR3 shouldn't contains 'gt' since that + * indicates we are waking with hypervisor state loss from nap. + */ + bgt cr3,. + + blr /* Return back to System Reset vector from where + power7_restore_hyp_resource was invoked */ + + +_GLOBAL(power7_wakeup_tb_loss) + ld r2,PACATOC(r13); + ld r1,PACAR1(r13) + /* + * Before entering any idle state, the NVGPRs are saved in the stack + * and they are restored before switching to the process context. Hence + * until they are restored, they are free to be used. + * + * Save SRR1 and LR in NVGPRs as they might be clobbered in + * opal_call_realmode (called in CHECK_HMI_INTERRUPT). SRR1 is required + * to determine the wakeup reason if we branch to kvm_start_guest. LR + * is required to return back to reset vector after hypervisor state + * restore is complete. + */ + mflr r17 + mfspr r16,SPRN_SRR1 +BEGIN_FTR_SECTION + CHECK_HMI_INTERRUPT +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) + + lbz r7,PACA_THREAD_MASK(r13) + ld r14,PACA_CORE_IDLE_STATE_PTR(r13) +lwarx_loop2: + lwarx r15,0,r14 + andi. r9,r15,PNV_CORE_IDLE_LOCK_BIT + /* + * Lock bit is set in one of the 2 cases- + * a. In the sleep/winkle enter path, the last thread is executing + * fastsleep workaround code. + * b. In the wake up path, another thread is executing fastsleep + * workaround undo code or resyncing timebase or restoring context + * In either case loop until the lock bit is cleared. + */ + bnel core_idle_lock_held + + cmpwi cr2,r15,0 + lbz r4,PACA_SUBCORE_SIBLING_MASK(r13) + and r4,r4,r15 + cmpwi cr1,r4,0 /* Check if first in subcore */ + + /* + * At this stage + * cr1 - 0b0100 if first thread to wakeup in subcore + * cr2 - 0b0100 if first thread to wakeup in core + * cr3- 0b0010 if waking up from sleep or winkle + * cr4 - 0b0100 if waking up from winkle + */ + + or r15,r15,r7 /* Set thread bit */ + + beq cr1,first_thread_in_subcore + + /* Not first thread in subcore to wake up */ + stwcx. r15,0,r14 + bne- lwarx_loop2 + isync + b common_exit + +first_thread_in_subcore: + /* First thread in subcore to wakeup */ + ori r15,r15,PNV_CORE_IDLE_LOCK_BIT + stwcx. r15,0,r14 + bne- lwarx_loop2 + isync + + /* + * If waking up from sleep, subcore state is not lost. Hence + * skip subcore state restore + */ + bne cr4,subcore_state_restored + + /* Restore per-subcore state */ + ld r4,_SDR1(r1) + mtspr SPRN_SDR1,r4 + ld r4,_RPR(r1) + mtspr SPRN_RPR,r4 + ld r4,_AMOR(r1) + mtspr SPRN_AMOR,r4 + +subcore_state_restored: + /* + * Check if the thread is also the first thread in the core. If not, + * skip to clear_lock. + */ + bne cr2,clear_lock + +first_thread_in_core: + + /* + * First thread in the core waking up from fastsleep. It needs to + * call the fastsleep workaround code if the platform requires it. + * Call it unconditionally here. The below branch instruction will + * be patched out when the idle states are discovered if platform + * does not require workaround. + */ +.global pnv_fastsleep_workaround_at_exit +pnv_fastsleep_workaround_at_exit: + b fastsleep_workaround_at_exit + +timebase_resync: + /* Do timebase resync if we are waking up from sleep. Use cr3 value + * set in exceptions-64s.S */ + ble cr3,clear_lock + /* Time base re-sync */ + li r0,OPAL_RESYNC_TIMEBASE + bl opal_call_realmode; + /* TODO: Check r3 for failure */ + + /* + * If waking up from sleep, per core state is not lost, skip to + * clear_lock. + */ + bne cr4,clear_lock + + /* Restore per core state */ + ld r4,_TSCR(r1) + mtspr SPRN_TSCR,r4 + ld r4,_WORC(r1) + mtspr SPRN_WORC,r4 + +clear_lock: + andi. r15,r15,PNV_CORE_IDLE_THREAD_BITS + lwsync + stw r15,0(r14) + +common_exit: + /* + * Common to all threads. + * + * If waking up from sleep, hypervisor state is not lost. Hence + * skip hypervisor state restore. + */ + bne cr4,hypervisor_state_restored + + /* Waking up from winkle */ + + /* Restore per thread state */ + bl __restore_cpu_power8 + + /* Restore SLB from PACA */ + ld r8,PACA_SLBSHADOWPTR(r13) + + .rept SLB_NUM_BOLTED + li r3, SLBSHADOW_SAVEAREA + LDX_BE r5, r8, r3 + addi r3, r3, 8 + LDX_BE r6, r8, r3 + andis. r7,r5,SLB_ESID_V@h + beq 1f + slbmte r6,r5 +1: addi r8,r8,16 + .endr + + ld r4,_SPURR(r1) + mtspr SPRN_SPURR,r4 + ld r4,_PURR(r1) + mtspr SPRN_PURR,r4 + ld r4,_DSCR(r1) + mtspr SPRN_DSCR,r4 + ld r4,_WORT(r1) + mtspr SPRN_WORT,r4 + +hypervisor_state_restored: + + mtspr SPRN_SRR1,r16 + mtlr r17 + blr /* Return back to System Reset vector from where + power7_restore_hyp_resource was invoked */ + +fastsleep_workaround_at_exit: + li r3,1 + li r4,0 + li r0,OPAL_CONFIG_CPU_IDLE_STATE + bl opal_call_realmode + b timebase_resync + +/* + * R3 here contains the value that will be returned to the caller + * of power7_nap. + */ +_GLOBAL(power7_wakeup_loss) + ld r1,PACAR1(r13) +BEGIN_FTR_SECTION + CHECK_HMI_INTERRUPT +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) + REST_NVGPRS(r1) + REST_GPR(2, r1) + ld r6,_CCR(r1) + ld r4,_MSR(r1) + ld r5,_NIP(r1) + addi r1,r1,INT_FRAME_SIZE + mtcr r6 + mtspr SPRN_SRR1,r4 + mtspr SPRN_SRR0,r5 + rfid + +/* + * R3 here contains the value that will be returned to the caller + * of power7_nap. + */ +_GLOBAL(power7_wakeup_noloss) + lbz r0,PACA_NAPSTATELOST(r13) + cmpwi r0,0 + bne power7_wakeup_loss +BEGIN_FTR_SECTION + CHECK_HMI_INTERRUPT +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) + ld r1,PACAR1(r13) + ld r6,_CCR(r1) + ld r4,_MSR(r1) + ld r5,_NIP(r1) + addi r1,r1,INT_FRAME_SIZE + mtcr r6 + mtspr SPRN_SRR1,r4 + mtspr SPRN_SRR0,r5 + rfid -- 2.4.11
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