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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by DM6NAM11FT038.mail.protection.outlook.com (10.13.173.137) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6298.32 via Frontend Transport; Thu, 13 Apr 2023 11:54:01 +0000 Received: from telco-siena.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Thu, 13 Apr 2023 06:54:00 -0500 From: Sivaprasad Tummala To: CC: Subject: [PATCH v2 1/3] eal: add x86 cpuid support for monitorx Date: Thu, 13 Apr 2023 04:53:32 -0700 Message-ID: <20230413115334.43172-1-sivaprasad.tummala@amd.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT038:EE_|DS7PR12MB5720:EE_ X-MS-Office365-Filtering-Correlation-Id: cb462967-d9b8-4ad2-f8d8-08db3c15c5f0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Apr 2023 11:54:01.5159 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cb462967-d9b8-4ad2-f8d8-08db3c15c5f0 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT038.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB5720 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Add a new CPUID flag to indicate support for monitorx instruction on AMD Epyc processors. Signed-off-by: Sivaprasad Tummala --- lib/eal/include/generic/rte_cpuflags.h | 2 ++ lib/eal/x86/include/rte_cpuflags.h | 1 + lib/eal/x86/rte_cpuflags.c | 3 +++ 3 files changed, 6 insertions(+) diff --git a/lib/eal/include/generic/rte_cpuflags.h b/lib/eal/include/generic/rte_cpuflags.h index d35551e931..db653a8dd7 100644 --- a/lib/eal/include/generic/rte_cpuflags.h +++ b/lib/eal/include/generic/rte_cpuflags.h @@ -26,6 +26,8 @@ struct rte_cpu_intrinsics { /**< indicates support for rte_power_pause function */ uint32_t power_monitor_multi : 1; /**< indicates support for rte_power_monitor_multi function */ + uint32_t amd_power_monitorx : 1; + /**< indicates amd support for rte_power_monitor function */ }; /** diff --git a/lib/eal/x86/include/rte_cpuflags.h b/lib/eal/x86/include/rte_cpuflags.h index 92e90fb6e0..d3e608533a 100644 --- a/lib/eal/x86/include/rte_cpuflags.h +++ b/lib/eal/x86/include/rte_cpuflags.h @@ -133,6 +133,7 @@ enum rte_cpu_flag_t { RTE_CPUFLAG_AVX512VP2INTERSECT, /**< AVX512 Two Register Intersection */ RTE_CPUFLAG_WAITPKG, /**< UMONITOR/UMWAIT/TPAUSE */ + RTE_CPUFLAG_MONITORX, /**< MONITORX */ /* The last item */ RTE_CPUFLAG_NUMFLAGS, /**< This should always be the last! */ diff --git a/lib/eal/x86/rte_cpuflags.c b/lib/eal/x86/rte_cpuflags.c index d6b518251b..ae2e0a8470 100644 --- a/lib/eal/x86/rte_cpuflags.c +++ b/lib/eal/x86/rte_cpuflags.c @@ -133,6 +133,7 @@ const struct feature_entry rte_cpu_feature_table[] = { FEAT_DEF(LAHF_SAHF, 0x80000001, 0, RTE_REG_ECX, 0) FEAT_DEF(LZCNT, 0x80000001, 0, RTE_REG_ECX, 4) + FEAT_DEF(MONITORX, 0x80000001, 0, RTE_REG_ECX, 29) FEAT_DEF(SYSCALL, 0x80000001, 0, RTE_REG_EDX, 11) FEAT_DEF(XD, 0x80000001, 0, RTE_REG_EDX, 20) @@ -191,5 +192,7 @@ rte_cpu_get_intrinsics_support(struct rte_cpu_intrinsics *intrinsics) intrinsics->power_pause = 1; if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_RTM)) intrinsics->power_monitor_multi = 1; + } else if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_MONITORX)) { + intrinsics->amd_power_monitorx = 1; } } From patchwork Thu Apr 13 11:53:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sivaprasad Tummala X-Patchwork-Id: 126026 X-Patchwork-Delegate: thomas@monjalon.net Return-Path: X-Original-To: patchwork@inbox.dpdk.org Delivered-To: patchwork@inbox.dpdk.org Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id B984142932; Thu, 13 Apr 2023 13:54:27 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id AA326410F3; Thu, 13 Apr 2023 13:54:27 +0200 (CEST) Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2070.outbound.protection.outlook.com [40.107.237.70]) by mails.dpdk.org (Postfix) with ESMTP id 08BB6410F3 for ; 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DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Apr 2023 11:54:24.8649 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fd3df228-f4c6-4774-c04e-08db3c15d3db X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT075.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7300 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org A new flag RTE_CPUFLAG_MONITORX is added to rte_cpu_flag_t in DPDK 23.07 release to support monitorx instruction on Epyc processors. This results in ABI breakage for legacy apps. Signed-off-by: Sivaprasad Tummala --- doc/guides/rel_notes/deprecation.rst | 3 +++ 1 file changed, 3 insertions(+) diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst index dcc1ca1696..65e849616d 100644 --- a/doc/guides/rel_notes/deprecation.rst +++ b/doc/guides/rel_notes/deprecation.rst @@ -163,3 +163,6 @@ Deprecation Notices The new port library API (functions rte_swx_port_*) will gradually transition from experimental to stable status starting with DPDK 23.07 release. + +* eal/x86: The enum ``rte_cpu_flag_t`` will be extended with a new cpu flag + ``RTE_CPUFLAG_MONITORX`` to support monitorx instruction on Epyc processors. 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DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Apr 2023 11:54:26.5992 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 634f7fd0-e102-4394-6070-08db3c15d4e4 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT075.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN6PR12MB8592 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org mwaitx allows epyc processors to enter a implementation dependent power/performance optimized state (C1 state) for a specific period or until a store to the monitored address range. Signed-off-by: Sivaprasad Tummala --- lib/eal/x86/rte_power_intrinsics.c | 83 ++++++++++++++++++++++++++++-- lib/power/rte_power_pmd_mgmt.c | 3 +- 2 files changed, 82 insertions(+), 4 deletions(-) diff --git a/lib/eal/x86/rte_power_intrinsics.c b/lib/eal/x86/rte_power_intrinsics.c index f749da9b85..d688066b3a 100644 --- a/lib/eal/x86/rte_power_intrinsics.c +++ b/lib/eal/x86/rte_power_intrinsics.c @@ -30,6 +30,7 @@ __umwait_wakeup(volatile void *addr) static bool wait_supported; static bool wait_multi_supported; +static bool amd_mwaitx_supported; static inline uint64_t __get_umwait_val(const volatile void *p, const uint8_t sz) @@ -65,6 +66,76 @@ __check_val_size(const uint8_t sz) } } +/** + * This function uses MONITORX/MWAITX instructions and will enter C1 state. + * For more information about usage of these instructions, please refer to + * AMD64 Architecture Programmer’s Manual. + */ +static inline int +amd_power_monitorx(const struct rte_power_monitor_cond *pmc, + const uint64_t tsc_timestamp) +{ + const unsigned int lcore_id = rte_lcore_id(); + struct power_wait_status *s; + uint64_t cur_value; + + RTE_SET_USED(tsc_timestamp); + + /* prevent non-EAL thread from using this API */ + if (lcore_id >= RTE_MAX_LCORE) + return -EINVAL; + + if (pmc == NULL) + return -EINVAL; + + if (__check_val_size(pmc->size) < 0) + return -EINVAL; + + if (pmc->fn == NULL) + return -EINVAL; + + s = &wait_status[lcore_id]; + + /* update sleep address */ + rte_spinlock_lock(&s->lock); + s->monitor_addr = pmc->addr; + + /* + * we're using raw byte codes for now as only the newest compiler + * versions support this instruction natively. + */ + /* set address for MONITORX */ + asm volatile(".byte 0x0f, 0x01, 0xfa;" + : + : "a"(pmc->addr), + "c"(0), /* no extensions */ + "d"(0)); /* no hints */ + + /* now that we've put this address into monitor, we can unlock */ + rte_spinlock_unlock(&s->lock); + + cur_value = __get_umwait_val(pmc->addr, pmc->size); + + /* check if callback indicates we should abort */ + if (pmc->fn(cur_value, pmc->opaque) != 0) + goto end; + + /* execute MWAITX */ + asm volatile(".byte 0x0f, 0x01, 0xfb;" + : /* ignore rflags */ + : "a"(0), /* enter C1 */ + "c"(0), /* no time-out */ + "b"(0)); + +end: + /* erase sleep address */ + rte_spinlock_lock(&s->lock); + s->monitor_addr = NULL; + rte_spinlock_unlock(&s->lock); + + return 0; +} + /** * This function uses UMONITOR/UMWAIT instructions and will enter C0.2 state. * For more information about usage of these instructions, please refer to @@ -81,8 +152,12 @@ rte_power_monitor(const struct rte_power_monitor_cond *pmc, uint64_t cur_value; /* prevent user from running this instruction if it's not supported */ - if (!wait_supported) - return -ENOTSUP; + if (!wait_supported) { + if (amd_mwaitx_supported) + return amd_power_monitorx(pmc, tsc_timestamp); + else + return -ENOTSUP; + } /* prevent non-EAL thread from using this API */ if (lcore_id >= RTE_MAX_LCORE) @@ -170,6 +245,8 @@ RTE_INIT(rte_power_intrinsics_init) { wait_supported = 1; if (i.power_monitor_multi) wait_multi_supported = 1; + if (i.amd_power_monitorx) + amd_mwaitx_supported = 1; } int @@ -178,7 +255,7 @@ rte_power_monitor_wakeup(const unsigned int lcore_id) struct power_wait_status *s; /* prevent user from running this instruction if it's not supported */ - if (!wait_supported) + if (!wait_supported && !amd_mwaitx_supported) return -ENOTSUP; /* prevent buffer overrun */ diff --git a/lib/power/rte_power_pmd_mgmt.c b/lib/power/rte_power_pmd_mgmt.c index ca1840387c..048a41dc29 100644 --- a/lib/power/rte_power_pmd_mgmt.c +++ b/lib/power/rte_power_pmd_mgmt.c @@ -447,7 +447,8 @@ check_monitor(struct pmd_core_cfg *cfg, const union queue *qdata) bool multimonitor_supported; /* check if rte_power_monitor is supported */ - if (!global_data.intrinsics_support.power_monitor) { + if ((!global_data.intrinsics_support.power_monitor) && + (!global_data.intrinsics_support.amd_power_monitorx)) { RTE_LOG(DEBUG, POWER, "Monitoring intrinsics are not supported\n"); return -ENOTSUP; }