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Date: Wed, 22 Jan 2014 12:39:04 +0530 From: Preeti U Murthy <preeti@...ux.vnet.ibm.com> To: peterz@...radead.org, fweisbec@...il.com, paul.gortmaker@...driver.com, paulus@...ba.org, mingo@...nel.org, mikey@...ling.org, shangw@...ux.vnet.ibm.com, rafael.j.wysocki@...el.com, galak@...nel.crashing.org, =daniel.lezcano@...aro.org, benh@...nel.crashing.org, paulmck@...ux.vnet.ibm.com, --to=agraf@...e.de, arnd@...db.de, linux-pm@...r.kernel.org, rostedt@...dmis.org, michael@...erman.id.au, john.stultz@...aro.org, anton@...ba.org, tglx@...utronix.de, chenhui.zhao@...escale.com, deepthi@...ux.vnet.ibm.com, r58472@...escale.com, geoff@...radead.org, linux-kernel@...r.kernel.org, srivatsa.bhat@...ux.vnet.ibm.com, schwidefsky@...ibm.com, svaidy@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org Subject: [RESEND PATCH V5 5/8] powermgt: Add OPAL call to resync timebase on wakeup From: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com> During "Fast-sleep" and deeper power savings state, decrementer and timebase could be stopped making it out of sync with rest of the cores in the system. Add a firmware call to request platform to resync timebase using low level platform methods. Signed-off-by: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com> Signed-off-by: Preeti U. Murthy <preeti@...ux.vnet.ibm.com> --- arch/powerpc/include/asm/opal.h | 2 ++ arch/powerpc/kernel/exceptions-64s.S | 2 +- arch/powerpc/kernel/idle_power7.S | 27 ++++++++++++++++++++++++ arch/powerpc/platforms/powernv/opal-wrappers.S | 1 + 4 files changed, 31 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h index 9a87b44..8c4829f 100644 --- a/arch/powerpc/include/asm/opal.h +++ b/arch/powerpc/include/asm/opal.h @@ -154,6 +154,7 @@ extern int opal_enter_rtas(struct rtas_args *args, #define OPAL_FLASH_VALIDATE 76 #define OPAL_FLASH_MANAGE 77 #define OPAL_FLASH_UPDATE 78 +#define OPAL_RESYNC_TIMEBASE 79 #define OPAL_GET_MSG 85 #define OPAL_CHECK_ASYNC_COMPLETION 86 @@ -863,6 +864,7 @@ extern void opal_flash_init(void); extern int opal_machine_check(struct pt_regs *regs); extern void opal_shutdown(void); +extern int opal_resync_timebase(void); extern void opal_lpc_init(void); diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index b01a9cb..9533d7a 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -145,7 +145,7 @@ BEGIN_FTR_SECTION /* Fast Sleep wakeup on PowerNV */ 8: GET_PACA(r13) - b .power7_wakeup_loss + b .power7_wakeup_tb_loss 9: END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) diff --git a/arch/powerpc/kernel/idle_power7.S b/arch/powerpc/kernel/idle_power7.S index 14f78be..c3ab869 100644 --- a/arch/powerpc/kernel/idle_power7.S +++ b/arch/powerpc/kernel/idle_power7.S @@ -17,6 +17,7 @@ #include <asm/ppc-opcode.h> #include <asm/hw_irq.h> #include <asm/kvm_book3s_asm.h> +#include <asm/opal.h> #undef DEBUG @@ -125,6 +126,32 @@ _GLOBAL(power7_sleep) b power7_powersave_common /* No return */ +_GLOBAL(power7_wakeup_tb_loss) + ld r2,PACATOC(r13); + ld r1,PACAR1(r13) + + /* Time base re-sync */ + li r0,OPAL_RESYNC_TIMEBASE + LOAD_REG_ADDR(r11,opal); + ld r12,8(r11); + ld r2,0(r11); + mtctr r12 + bctrl + + /* TODO: Check r3 for failure */ + + REST_NVGPRS(r1) + REST_GPR(2, r1) + ld r3,_CCR(r1) + ld r4,_MSR(r1) + ld r5,_NIP(r1) + addi r1,r1,INT_FRAME_SIZE + mtcr r3 + mfspr r3,SPRN_SRR1 /* Return SRR1 */ + mtspr SPRN_SRR1,r4 + mtspr SPRN_SRR0,r5 + rfid + _GLOBAL(power7_wakeup_loss) ld r1,PACAR1(r13) REST_NVGPRS(r1) diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S index 719aa5c..a11a87c 100644 --- a/arch/powerpc/platforms/powernv/opal-wrappers.S +++ b/arch/powerpc/platforms/powernv/opal-wrappers.S @@ -126,5 +126,6 @@ OPAL_CALL(opal_return_cpu, OPAL_RETURN_CPU); OPAL_CALL(opal_validate_flash, OPAL_FLASH_VALIDATE); OPAL_CALL(opal_manage_flash, OPAL_FLASH_MANAGE); OPAL_CALL(opal_update_flash, OPAL_FLASH_UPDATE); +OPAL_CALL(opal_resync_timebase, OPAL_RESYNC_TIMEBASE); OPAL_CALL(opal_get_msg, OPAL_GET_MSG); OPAL_CALL(opal_check_completion, OPAL_CHECK_ASYNC_COMPLETION); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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