From patchwork Thu Aug 18 13:22:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Junhao He X-Patchwork-Id: 12947087 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E9123C00140 for ; Thu, 18 Aug 2022 13:41:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=rAB2DxcaURqKO8vUNPKuMBKlKEkJ1RRQoHAGnHLg+7o=; b=SgkhBSJU7DewuF TI/j3dYq7VL74qi+LlmVkHxuNzFS4N65o4/FBz/ZNJ0O2FwJZfQDNYffDC1GkqUtWHa2X3r6GlWMs qBtzw7FxSeHUslqVreDBKBz6mUdxtaTNQG7Uq7nEPy16i1qBLXAhxQzd1j+jcmh6VaBHRcaXX+gkr aHo8AnGFksqiYozh2B5Jy++Tfi19udejiemzJ9WTaYO6xOzd05meQ33FK0qzaz+2rIv2umRyB8+DU UrmNo2CLYYbAucBgWf86IIbWhzy9dN94IekW1f8+SVG4gfG9IvZ7haA4HWb3HAW5pTMH6aVs5xYjP Xm3VjhLjEh1Rzvte1EpA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oOflG-005Zgk-6a; Thu, 18 Aug 2022 13:40:38 +0000 Received: from szxga01-in.huawei.com ([45.249.212.187]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oOfW6-005LQ1-Ds for linux-arm-kernel@lists.infradead.org; Thu, 18 Aug 2022 13:25:01 +0000 Received: from dggpeml500020.china.huawei.com (unknown [172.30.72.56]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4M7ls40W2dzkWPY; Thu, 18 Aug 2022 21:21:28 +0800 (CST) Received: from dggpeml500002.china.huawei.com (7.185.36.158) by dggpeml500020.china.huawei.com (7.185.36.88) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Thu, 18 Aug 2022 21:24:50 +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 15.1.2375.24; Thu, 18 Aug 2022 21:24:50 +0800 From: Junhao He To: , , , CC: , , , , , , , , Subject: [PATCH v9 2/2] Documentation: Add document for UltraSoc SMB drivers Date: Thu, 18 Aug 2022 21:22:31 +0800 Message-ID: <20220818132231.28240-3-hejunhao3@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20220818132231.28240-1-hejunhao3@huawei.com> References: <20220818132231.28240-1-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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220818_062458_911744_DD1EE2B6 X-CRM114-Status: GOOD ( 16.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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..acc0f6e82c25 --- /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: August 2022 +KernelVersion: 6.0 +Contact: Qi Liu +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: August 2022 +KernelVersion: 6.0 +Contact: Qi Liu +Description: (Read) Shows the buffer size of each UltraSoc SMB device. + +What: /sys/bus/coresight/devices/ultra_smb/mgmt/buf_status +Date: August 2022 +KernelVersion: 6.0 +Contact: Qi Liu +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: August 2022 +KernelVersion: 6.0 +Contact: Qi Liu +Description: (Read) Shows the value held by UltraSoc SMB Read Pointer register. + +What: /sys/bus/coresight/devices/ultra_smb/mgmt/write_pos +Date: August 2022 +KernelVersion: 6.0 +Contact: Qi Liu +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}, \ + } \ + } \ + }) \ + }