From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pdx-out-003.esa.us-west-2.outbound.mail-perimeter.amazon.com (pdx-out-003.esa.us-west-2.outbound.mail-perimeter.amazon.com [44.246.68.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C4C6E3A7F40; Sun, 24 May 2026 15:39:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=44.246.68.102 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779637149; cv=none; b=B6qW6txqZDcdkL4M5BfnqbYdbbUqIImHrch9DUyIwmSTM5XkG1CkUegIMK7v6dm7ZEaEHni89MB7IpvNLgokDaiLHxt4kIlK3/X6w/z+md4LxIMkGRz7VEmsKvQE+zmCL7G70hHfa6x9irPwVp6WuES+RN/KuGVChvEhtBmcUGM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779637149; c=relaxed/simple; bh=EjY0qyypSox9dx1PxErXpoQFpc2MXcm/AQ/FyD7nASc=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=isrMinhTW0d4y9SW6Dcm1UD0Q/xeun8XKpQeJxrv2VSuWKkwKwGH7Tv9pB7j+ZS2DiHEJ2w+oe1VJEqUPkk69Jbb01KPCyP37SAfzdZZiZ0M/D2gRJedPrZUFZKH2G+VfjKQkJb982rJSez9WKfsgBs1N5UkN0ghkC1vwSLGtck= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com; spf=pass smtp.mailfrom=amazon.com; dkim=pass (2048-bit key) header.d=amazon.com header.i=@amazon.com header.b=RCzFZM1d; arc=none smtp.client-ip=44.246.68.102 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=amazon.com header.i=@amazon.com header.b="RCzFZM1d" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazoncorp2; t=1779637147; x=1811173147; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=8g9UgLLxo2Fuh4J8hCO+Zlk0sbgEK3VZTNEp9tiWrc8=; b=RCzFZM1dUUUZ2mhsTkj9O4MLAdmtTx0jNAq/w10gLJcDFdugT+IZ+wWJ R+5972KmxKYUNpDoWOWB202rLqO2JZz7WO0i/mLMTIywML6LIAne+IR77 +PbjDay5if5iwTDtvxSlgfQap+lqU4tuEoukQfSnkt+yNSTXpe/0nxAU9 PxZtpPgbRVhWPYiHqmUyKJ94b2nG5IjIW5rdCAHajtXrKrVL/21pHS4Sz EgeLwYRK459foX9G2nyj4Xl6csouPFQAz7w41gl3nB3T+JLa3vah+hSh9 NVWjlA6apSkHaGOdcHZuqUg1rB5TPprEFBcQ1eq1dJf4cfFnKC3PHtElN A==; X-CSE-ConnectionGUID: kY/91ROSQ6yS+JKmk3U+iQ== X-CSE-MsgGUID: txIf5C8sS1+zlUX3/hKIjQ== X-IronPort-AV: E=Sophos;i="6.24,166,1774310400"; d="scan'208";a="20391560" Received: from ip-10-5-12-219.us-west-2.compute.internal (HELO smtpout.naws.us-west-2.prod.farcaster.email.amazon.dev) ([10.5.12.219]) by internal-pdx-out-003.esa.us-west-2.outbound.mail-perimeter.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 May 2026 15:39:05 +0000 Received: from EX19MTAUWC001.ant.amazon.com [205.251.233.53:13066] by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.53.254:2525] with esmtp (Farcaster) id 59be0b91-0c87-4ae3-b7fe-25fe0a37c103; Sun, 24 May 2026 15:39:05 +0000 (UTC) X-Farcaster-Flow-ID: 59be0b91-0c87-4ae3-b7fe-25fe0a37c103 Received: from EX19D001UWA001.ant.amazon.com (10.13.138.214) by EX19MTAUWC001.ant.amazon.com (10.250.64.174) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.37; Sun, 24 May 2026 15:39:03 +0000 Received: from dev-dsk-avivb-1b-e28f450e.eu-west-1.amazon.com (10.15.33.9) by EX19D001UWA001.ant.amazon.com (10.13.138.214) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.37; Sun, 24 May 2026 15:39:02 +0000 From: Aviv Bakal To: , , CC: , , , , , Subject: [PATCH v3 2/2] perf/arm-cmn: Add workarounds for CMN-S3 on Graviton5 Date: Sun, 24 May 2026 18:38:48 +0300 Message-ID: <20260524153848.16334-3-avivb@amazon.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260524153848.16334-1-avivb@amazon.com> References: <20260504133923.23373-1-avivb@amazon.com> <20260524153848.16334-1-avivb@amazon.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: EX19D033UWC004.ant.amazon.com (10.13.139.225) To EX19D001UWA001.ant.amazon.com (10.13.138.214) Graviton5 uses a customised CMN-S3 implementation where certain discovery registers report zeroed fields. Add the following workarounds: - Introduce a dedicated ACPI HID to identify the Graviton5 CMN variant. - Derive the DTC domain from the XP node ID, since the unit info register reports it as zero. - Set the DTC logical ID from the XP's logical ID, since the node info register's logical ID field is also zeroed. Signed-off-by: Aviv Bakal --- drivers/perf/arm-cmn.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c index 3443b819afed..0184e598777a 100644 --- a/drivers/perf/arm-cmn.c +++ b/drivers/perf/arm-cmn.c @@ -208,6 +208,8 @@ enum cmn_part { PART_CMN700 = 0x43c, PART_CI700 = 0x43a, PART_CMN_S3 = 0x43e, + /* Synthetic part number, overridden to PART_CMN_S3 during discovery */ + PART_GRAVITON5 = 0xa5, }; /* CMN-600 r0px shouldn't exist in silicon, thankfully */ @@ -2197,6 +2199,18 @@ static unsigned int arm_cmn_dtc_domain(struct arm_cmn *cmn, void __iomem *xp_reg return FIELD_GET(CMN_DTM_UNIT_INFO_DTC_DOMAIN, readl_relaxed(xp_region + offset)); } +static unsigned int arm_cmn_graviton5_dtc_domain(u16 xp_id) +{ + unsigned int x = (xp_id >> 7) & 0xf; + unsigned int y = (xp_id >> 3) & 0xf; + + /* + * The unit info register reads as zero; derive the DTC domain from + * the XP's mesh coordinates over the 10x14 mesh. + */ + return (x / 5) + (y / 7) * 2; +} + static void arm_cmn_init_node_info(struct arm_cmn *cmn, u32 offset, struct arm_cmn_node *node) { int level; @@ -2242,6 +2256,7 @@ static int arm_cmn_discover(struct arm_cmn *cmn, unsigned int rgn_offset) u64 reg; int i, j; size_t sz; + bool graviton5_workaround = false; arm_cmn_init_node_info(cmn, rgn_offset, &cfg); if (cfg.type != CMN_TYPE_CFG) @@ -2252,6 +2267,13 @@ static int arm_cmn_discover(struct arm_cmn *cmn, unsigned int rgn_offset) reg = readq_relaxed(cfg_region + CMN_CFGM_PERIPH_ID_01); part = FIELD_GET(CMN_CFGM_PID0_PART_0, reg); part |= FIELD_GET(CMN_CFGM_PID1_PART_1, reg) << 8; + + /* Graviton5 has a customised CMN-S3 which needs some fixups */ + if (cmn->part == PART_GRAVITON5) { + cmn->part = PART_CMN_S3; + graviton5_workaround = true; + } + /* 600AE is close enough that it's not really worth more complexity */ if (part == PART_CMN600AE) part = PART_CMN600; @@ -2341,6 +2363,8 @@ static int arm_cmn_discover(struct arm_cmn *cmn, unsigned int rgn_offset) if (cmn->part == PART_CMN600) xp->dtc = -1; + else if (graviton5_workaround) + xp->dtc = arm_cmn_graviton5_dtc_domain(xp->id); else xp->dtc = arm_cmn_dtc_domain(cmn, xp_region); @@ -2419,6 +2443,10 @@ static int arm_cmn_discover(struct arm_cmn *cmn, unsigned int rgn_offset) switch (dn->type) { case CMN_TYPE_DTC: + if (graviton5_workaround) { + /* Node info logical ID is zeroed; use the XP's */ + dn->logid = xp->logid; + } cmn->num_dtcs++; dn++; break; @@ -2634,6 +2662,7 @@ static const struct acpi_device_id arm_cmn_acpi_match[] = { { "ARMHC650" }, { "ARMHC700" }, { "ARMHC003" }, + { "AMZN0070", PART_GRAVITON5 }, {} }; MODULE_DEVICE_TABLE(acpi, arm_cmn_acpi_match); -- 2.47.3