From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp06.in.ibm.com (e28smtp06.in.ibm.com [59.145.155.6]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e28smtp06.in.ibm.com", Issuer "Equifax" (verified OK)) by bilbo.ozlabs.org (Postfix) with ESMTPS id 019BCB7BAE for ; Tue, 15 Sep 2009 22:07:05 +1000 (EST) Received: from d28relay05.in.ibm.com (d28relay05.in.ibm.com [9.184.220.62]) by e28smtp06.in.ibm.com (8.14.3/8.13.1) with ESMTP id n8FC71bK003414 for ; Tue, 15 Sep 2009 17:37:01 +0530 Received: from d28av03.in.ibm.com (d28av03.in.ibm.com [9.184.220.65]) by d28relay05.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id n8FC71AO2404398 for ; Tue, 15 Sep 2009 17:37:01 +0530 Received: from d28av03.in.ibm.com (loopback [127.0.0.1]) by d28av03.in.ibm.com (8.14.3/8.13.1/NCO v10.0 AVout) with ESMTP id n8FC70gq006932 for ; Tue, 15 Sep 2009 22:07:01 +1000 Subject: [PATCH v3 1/3] pSeries: cede latency specifier helper function. To: Joel Schopp , Benjamin Herrenschmidt , Peter Zijlstra , Balbir Singh , Venkatesh Pallipadi , Dipankar Sarma , Vaidyanathan Srinivasan From: Gautham R Shenoy Date: Tue, 15 Sep 2009 17:37:01 +0530 Message-ID: <20090915120701.20523.94109.stgit@sofia.in.ibm.com> In-Reply-To: <20090915120629.20523.79019.stgit@sofia.in.ibm.com> References: <20090915120629.20523.79019.stgit@sofia.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: Arun R Bharadwaj , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, "Darrick J. Wong" List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Arun R Bharadwaj This patch provides helper functions to set the cede latency specifier value in the VPA indicating the latency expectation of the guest OS to inform the hypervisor's choice of the platform dependent energy saving mode chosen for the processor when unused during the subsequent H_CEDE hypercall. Signed-off-by: Arun R Bharadwaj Signed-off-by: Gautham R Shenoy --- arch/powerpc/include/asm/lppaca.h | 9 ++++++++- arch/powerpc/platforms/pseries/plpar_wrappers.h | 17 +++++++++++++++++ arch/powerpc/xmon/xmon.c | 3 ++- 3 files changed, 27 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/include/asm/lppaca.h b/arch/powerpc/include/asm/lppaca.h index f78f65c..aaa0066 100644 --- a/arch/powerpc/include/asm/lppaca.h +++ b/arch/powerpc/include/asm/lppaca.h @@ -100,7 +100,14 @@ struct lppaca { // Used to pass parms from the OS to PLIC for SetAsrAndRfid u64 saved_gpr3; // Saved GPR3 x20-x27 u64 saved_gpr4; // Saved GPR4 x28-x2F - u64 saved_gpr5; // Saved GPR5 x30-x37 + union { + u64 saved_gpr5; // Saved GPR5 x30-x37 + struct { + u8 cede_latency_hint; // x30 + u8 reserved[7]; // x31-x36 + } fields; + } gpr5_dword; + u8 dtl_enable_mask; // Dispatch Trace Log mask x38-x38 u8 donate_dedicated_cpu; // Donate dedicated CPU cycles x39-x39 diff --git a/arch/powerpc/platforms/pseries/plpar_wrappers.h b/arch/powerpc/platforms/pseries/plpar_wrappers.h index a24a6b2..1174d4b 100644 --- a/arch/powerpc/platforms/pseries/plpar_wrappers.h +++ b/arch/powerpc/platforms/pseries/plpar_wrappers.h @@ -9,11 +9,28 @@ static inline long poll_pending(void) return plpar_hcall_norets(H_POLL_PENDING); } +static inline u8 get_cede_latency_hint(void) +{ + return get_lppaca()->gpr5_dword.fields.cede_latency_hint; +} + +static inline void set_cede_latency_hint(u8 latency_hint) +{ + get_lppaca()->gpr5_dword.fields.cede_latency_hint = latency_hint; +} + static inline long cede_processor(void) { return plpar_hcall_norets(H_CEDE); } +static inline long extended_cede_processor(u8 latency_hint) +{ + set_cede_latency_hint(latency_hint); + cede_processor(); + +} + static inline long vpa_call(unsigned long flags, unsigned long cpu, unsigned long vpa) { diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index e1f33a8..a2089cd 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -1613,7 +1613,8 @@ static void super_regs(void) ptrLpPaca->saved_srr0, ptrLpPaca->saved_srr1); printf(" Saved Gpr3=%.16lx Saved Gpr4=%.16lx \n", ptrLpPaca->saved_gpr3, ptrLpPaca->saved_gpr4); - printf(" Saved Gpr5=%.16lx \n", ptrLpPaca->saved_gpr5); + printf(" Saved Gpr5=%.16lx \n", + ptrLpPaca->gpr5_dword.saved_gpr5); } #endif