Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753426AbZIOMHM (ORCPT ); Tue, 15 Sep 2009 08:07:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753388AbZIOMHK (ORCPT ); Tue, 15 Sep 2009 08:07:10 -0400 Received: from e28smtp04.in.ibm.com ([59.145.155.4]:37412 "EHLO e28smtp04.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753361AbZIOMHB (ORCPT ); Tue, 15 Sep 2009 08:07:01 -0400 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 Cc: Arun R Bharadwaj , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, "Darrick J. Wong" 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> User-Agent: StGit/0.14.3.384.g9ab0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3191 Lines: 89 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/