From patchwork Mon Nov 7 13:06:24 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: hejunhao X-Patchwork-Id: 16407 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp2037988wru; Mon, 7 Nov 2022 05:08:29 -0800 (PST) X-Google-Smtp-Source: AMsMyM6wXOFygQm3+avZ7/sZht51WKYVChGE5qQFrbFU0n2TPhzvODOIAjKLjIsyxCB8iAgsB1G5 X-Received: by 2002:a17:90a:600a:b0:213:2a:851c with SMTP id y10-20020a17090a600a00b00213002a851cmr68037939pji.177.1667826508948; Mon, 07 Nov 2022 05:08:28 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1667826508; cv=none; d=google.com; s=arc-20160816; b=JVH2GnONtDbMVVrZd1RBC1RJEITREnapNZwGS2Dj9zuXlwuMMTigbH9GAlGLQScg9v yi5/0GRLG9ZjBfczLwrKyKjiGXPSoXyd9MiaFMxD4W3Dg/tluLD4miqKaDQqi7T0rBhL Cm4yirZeIxszkCqnnVWHfQm29oIMYx2p9gdkcGR/hhpEnTHxTZxSs/2C7OToB/UzB3xT W3b6b6Xytnz7uArmrCPTv0eg0pyvX2MfPyLUCt8garJMFNhwuTMiu8846J5zWGcJtfBo yU7qOr0o70SGlGewWF6ALFi4iQFp5JdrpgGmAzVJGZYhN+sw3hcsEw1Miav442dVtOuZ zafA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from; bh=z9WXAPsWgjx8z3npq0xm5BQqAb51zyonHDzqnDYc/Ig=; b=mXVzz8hZ15r6dDhWwgamWT+jVcE7WI50k12vD1qLgjep2CRYLLo0xp13y9J28iuMBp YLNYwBHZSS4cnvFeWjvNZ1Foqap67CJ2qLEin5MBqsdG+7K3tU5mS30jsJZltZn+MOog s6rgo3CJ98TgiTDwCtGrTGU4gVimc30WzLeTqzVIjHZX0asre8Bh6n4YxctN5wrkPVpK FSitDUnFjcJtadbioib1jB75AyYosURYaCCgqjYUOHiZtgObp8kLtJD18eUTGiewNzR3 Jv2hYTv+V2urafw02HYUv7sB7X+fWqUOxpjGl0Zwb+yGC6SBzcnM9yc7QkkVE713N1WN /EgA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=huawei.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id c20-20020a056a00249400b0056f0d233a56si4289705pfv.235.2022.11.07.05.08.15; Mon, 07 Nov 2022 05:08:28 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=huawei.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231894AbiKGNGC (ORCPT + 99 others); Mon, 7 Nov 2022 08:06:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47148 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231411AbiKGNF7 (ORCPT ); Mon, 7 Nov 2022 08:05:59 -0500 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 037381C41A for ; Mon, 7 Nov 2022 05:05:57 -0800 (PST) Received: from dggpeml500026.china.huawei.com (unknown [172.30.72.57]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4N5WcH6kDpzJnXT; Mon, 7 Nov 2022 21:02:55 +0800 (CST) Received: from dggpeml500002.china.huawei.com (7.185.36.158) by dggpeml500026.china.huawei.com (7.185.36.106) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 7 Nov 2022 21:05:54 +0800 Received: from localhost.localdomain (10.69.192.56) by dggpeml500002.china.huawei.com (7.185.36.158) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 7 Nov 2022 21:05:53 +0800 From: Junhao He To: , , , , , CC: , , , , , , , , , , Subject: [PATCH v11 2/2] Documentation: Add document for UltraSoc SMB drivers Date: Mon, 7 Nov 2022 21:06:24 +0800 Message-ID: <20221107130624.59886-3-hejunhao3@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20221107130624.59886-1-hejunhao3@huawei.com> References: <20221107130624.59886-1-hejunhao3@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.69.192.56] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggpeml500002.china.huawei.com (7.185.36.158) X-CFilter-Loop: Reflected X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1748842849512243026?= X-GMAIL-MSGID: =?utf-8?q?1748842849512243026?= From: Qi Liu This patch bring in documentation for UltraSoc SMB drivers. It simply describes the device, sysfs interface and the firmware bindings. Signed-off-by: Qi Liu Signed-off-by: Junhao He --- .../sysfs-bus-coresight-devices-ultra_smb | 31 +++++++ .../trace/coresight/ultrasoc-smb.rst | 80 +++++++++++++++++++ 2 files changed, 111 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-ultra_smb create mode 100644 Documentation/trace/coresight/ultrasoc-smb.rst diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-ultra_smb b/Documentation/ABI/testing/sysfs-bus-coresight-devices-ultra_smb new file mode 100644 index 000000000000..7804aef4b40b --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-ultra_smb @@ -0,0 +1,31 @@ +What: /sys/bus/coresight/devices/ultra_smb/enable_sink +Date: October 2022 +KernelVersion: 6.1 +Contact: Junhao He +Description: (RW) Add/remove a SMB device from a trace path. There can be + multiple sources for a single SMB device. + +What: /sys/bus/coresight/devices/ultra_smb/mgmt/buf_size +Date: October 2022 +KernelVersion: 6.1 +Contact: Junhao He +Description: (Read) Shows the buffer size of each UltraSoc SMB device. + +What: /sys/bus/coresight/devices/ultra_smb/mgmt/buf_status +Date: October 2022 +KernelVersion: 6.1 +Contact: Junhao He +Description: (Read) Shows the value held by UltraSoc SMB status register. + BIT(0) is zero means buffer is empty. + +What: /sys/bus/coresight/devices/ultra_smb/mgmt/read_pos +Date: October 2022 +KernelVersion: 6.1 +Contact: Junhao He +Description: (Read) Shows the value held by UltraSoc SMB Read Pointer register. + +What: /sys/bus/coresight/devices/ultra_smb/mgmt/write_pos +Date: October 2022 +KernelVersion: 6.1 +Contact: Junhao He +Description: (Read) Shows the value held by UltraSoc SMB Write Pointer register. diff --git a/Documentation/trace/coresight/ultrasoc-smb.rst b/Documentation/trace/coresight/ultrasoc-smb.rst new file mode 100644 index 000000000000..6d28ef0f6c88 --- /dev/null +++ b/Documentation/trace/coresight/ultrasoc-smb.rst @@ -0,0 +1,80 @@ +.. SPDX-License-Identifier: GPL-2.0 + +====================================== +UltraSoc - HW Assisted Tracing on SoC +====================================== + :Author: Qi Liu + :Date: March 2022 + +Introduction +------------ + +UltraSoc SMB is a per SCCL(Super CPU Cluster) hardware, and it provides a +way to buffer and store CPU trace messages in a region of shared system +memory. SMB is plugged as a coresight sink device and the corresponding +trace generators (ETM) are plugged in as source devices. + +Sysfs files and directories +--------------------------- + +The SMB devices appear on the existing coresight bus alongside the other +coresight devices:: + + $# ls /sys/bus/coresight/devices/ + ultra_smb0 ultra_smb1 ultra_smb2 ultra_smb3 + +The ``ultra_smb`` named SMB associated with SCCL.:: + + $# ls /sys/bus/coresight/devices/ultra_smb0 + enable_sink mgmt + $# ls /sys/bus/coresight/devices/ultra_smb0/mgmt + buf_size buf_status read_pos write_pos + +*Key file items are:-* + * ``read_pos``: Shows the value held by UltraSoc SMB Read Pointer register. + * ``write_pos``: Shows the value held by UltraSoc SMB Write Pointer register. + * ``buf_status``: Shows the value held by UltraSoc SMB status register. + BIT(0) is zero means buffer is empty. + * ``buf_size``: Shows the buffer size of each UltraSoc SMB device. + +Firmware Bindings +--------------------------- + +SMB device is only supported with ACPI, and ACPI binding of SMB device +describes SMB device indentifier, resource information and graph structure. + +SMB is identified by ACPI HID "HISI03A1", resource of device is declared using +the _CRS method. Each SMB must present two base address, the first one is the +configuration base address of SMB device, the second one is the base address of +shared system memory. + +examples:: + + Device(USMB) { \ + Name(_HID, "HISI03A1") \ + Name(_CRS, ResourceTemplate() { \ + MEM_RESRC(0x95100000, 0x951FFFFF, 0x100000) \ + MEM_RESRC(0x50000000, 0x53FFFFFF, 0x4000000) \ + }) \ + Name(_DSD, Package() { \ + ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), \ + /* Use CoreSight Graph ACPI bindings to describe connections topology */ + Package() { \ + 0, \ + 1, \ + Package() { \ + 1, \ + ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"), \ + 8, \ + Package() {0x8, 0, \_SB.S00.SL11.CL28.F008, 0}, \ + Package() {0x9, 0, \_SB.S00.SL11.CL29.F009, 0}, \ + Package() {0xa, 0, \_SB.S00.SL11.CL2A.F010, 0}, \ + Package() {0xb, 0, \_SB.S00.SL11.CL2B.F011, 0}, \ + Package() {0xc, 0, \_SB.S00.SL11.CL2C.F012, 0}, \ + Package() {0xd, 0, \_SB.S00.SL11.CL2D.F013, 0}, \ + Package() {0xe, 0, \_SB.S00.SL11.CL2E.F014, 0}, \ + Package() {0xf, 0, \_SB.S00.SL11.CL2F.F015, 0}, \ + } \ + } \ + }) \ + }