Received: by 2002:a05:6a10:6d10:0:0:0:0 with SMTP id gq16csp1557250pxb; Sat, 16 Apr 2022 12:32:48 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwG5aLjGArJ/YuWt1CB7Prg3gCrpxmiJ99pkhW7Mx+Lmy1Oa85PF8tPMVZw9D1TXoTcGcvw X-Received: by 2002:a17:90a:430d:b0:1bc:f340:8096 with SMTP id q13-20020a17090a430d00b001bcf3408096mr5089864pjg.93.1650137568571; Sat, 16 Apr 2022 12:32:48 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1650137568; cv=none; d=google.com; s=arc-20160816; b=k72L3sl/JnnMLCzEbi1BW7kLF94FqoQy37vG4lwaN8mzXtHNZ+HkrWCB2DSjY1a5Er K7ZmI2QavSIZBOiJ4RWG0MwgTOjISlbVrLv0URJj+cpayXOl54Orz8Ai6mkHW1l1J5u6 Gr9qUKYjtMsm09XmoXmqXcXDT+veqER+KfLE7Sf9AXeeer1SZ6eQgqjYlOyp55byFXTc sPe4o5F2MWO+qvuLlzxfU5DmvDXWPCilv9oFgedkG5VozDxRzYHS03da8q/pwM03epjC PamKdxWEodbks2oe4xAr5OEukA6k70mwrhlNtFa4vKGJFxqsSb4vbDSUpbWeNUfJ2wZc a2PQ== 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=H6UnMZM4IK766jPrZLOura51nDtMgl4yA8kQrWAO164=; b=RTD6b/C523x+ACpCUnD8U5+1PN64JndT2lgQgRuXOOM0OxyXYy3b5w3zcpD87l2LCD +6u0PwNJa77q3cTaEcpP7W8fcjHa0M9ewE8hiEXJa16v0dnoneUzWhpCFAhcjhwpuZj0 zNf1yKnZw1yQcTYCXlBuNeOQ9L04P6GpSF7asZczJktbmEUjbQCoFJXyJ1QltmP10Vts FcAxLu3sFgYqpjytlDjn2j5Xs1UDoG6X3PwBWLuYoKbVVx+BDxl3lF6EHRcc6LCuLnD7 yvkMK32ZVUaTOcugswf+g0H0Ed9qiyjGdOutDRlQYgBjTqhCfPJbRqQsyYbBV4w/cnaV Jb0Q== 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 Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id t39-20020a056a0013a700b004fa3a8e0032si4454144pfg.233.2022.04.16.12.32.00; Sat, 16 Apr 2022 12:32:48 -0700 (PDT) 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 S230410AbiDPIoS (ORCPT + 99 others); Sat, 16 Apr 2022 04:44:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45126 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230407AbiDPIoH (ORCPT ); Sat, 16 Apr 2022 04:44:07 -0400 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D23529D4D2 for ; Sat, 16 Apr 2022 01:41:34 -0700 (PDT) Received: from kwepemi500007.china.huawei.com (unknown [172.30.72.54]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4KgRQH3TfrzCqxr; Sat, 16 Apr 2022 16:37:11 +0800 (CST) Received: from kwepemm600003.china.huawei.com (7.193.23.202) by kwepemi500007.china.huawei.com (7.221.188.207) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Sat, 16 Apr 2022 16:41:32 +0800 Received: from localhost.localdomain (10.67.164.66) by kwepemm600003.china.huawei.com (7.193.23.202) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Sat, 16 Apr 2022 16:41:32 +0800 From: Qi Liu To: , CC: , , , , Subject: [PATCH v5 2/2] Documentation: Add document for UltraSoc SMB drivers Date: Sat, 16 Apr 2022 16:39:53 +0800 Message-ID: <20220416083953.52610-3-liuqi115@huawei.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20220416083953.52610-1-liuqi115@huawei.com> References: <20220416083953.52610-1-liuqi115@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.67.164.66] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To kwepemm600003.china.huawei.com (7.193.23.202) X-CFilter-Loop: Reflected X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED, RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE 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 This patch bring in a documentation for UltraSoc SMB drivers. It simple descripts the device, sysfs interface and the firmware bindings. Signed-off-by: Qi Liu --- .../trace/coresight/ultrasoc-smb.rst | 79 +++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 Documentation/trace/coresight/ultrasoc-smb.rst diff --git a/Documentation/trace/coresight/ultrasoc-smb.rst b/Documentation/trace/coresight/ultrasoc-smb.rst new file mode 100644 index 000000000000..024fa4492f42 --- /dev/null +++ b/Documentation/trace/coresight/ultrasoc-smb.rst @@ -0,0 +1,79 @@ +.. 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 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 +--------------------------- + +Firmware binding of SMB device describes SMB device indentifier, resource +information and graph structure. + +SMB is platform device and device id is "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"), \ + 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}, \ + } \ + } \ + }) \ + } -- 2.24.0