From mboxrd@z Thu Jan 1 00:00:00 1970 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 03A9CC4332F for ; Wed, 9 Nov 2022 16:58:36 +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:Subject:CC:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=AQCUpgtEEFApO8+NvaXybXnRENDHvm9Jb8TvwWdOwvU=; b=RDMJRqDbO5l8Lt 9ZCOKtZtHsRsUZdxfd72PM5x3C5Mcv0WQr+Rq3I9ttA4FQkd3RFr1/5078dgaAeKQeaOZsc2gyaq0 Da8n0ORyrNCL+pUIaOFwUmzhmoU/i7RLPsGZZwcJ/6lB4ZesQVtngTPXKMpYUsjueRHcQW0jaa8sY kCmB54X+O8ABZpC2pnY1ptjXWjjlmbMXsBgyigu5owS+y5GHBWEGBvaFHkwmuPw9Qktm+Hp8meTQm lduXnyjuwIYj4JfAzqTGdBPlWxUi7ImVzWwwjKTwLQv0dj9XL5p7DK+5nyKkxkCDuDNhlqcfmUq+V Esl6xHdEBtpCVrSmsVTQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1osoON-00FHFR-8b; Wed, 09 Nov 2022 16:57:35 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1osoOJ-00FHEF-CC for linux-arm-kernel@lists.infradead.org; Wed, 09 Nov 2022 16:57:33 +0000 Received: from fraeml705-chm.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4N6rgQ4MDQz67ykV; Thu, 10 Nov 2022 00:55:14 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (7.191.163.240) by fraeml705-chm.china.huawei.com (10.206.15.54) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2375.31; Wed, 9 Nov 2022 17:57:29 +0100 Received: from localhost (10.45.145.27) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Wed, 9 Nov 2022 16:57:26 +0000 Date: Wed, 9 Nov 2022 16:57:24 +0000 From: Jonathan Cameron To: Junhao He CC: , , , , , , , , , , , , Subject: Re: [PATCH v12 2/2] Documentation: Add document for UltraSoc SMB drivers Message-ID: <20221109165724.000024ca@Huawei.com> In-Reply-To: <20221109135008.9485-3-hejunhao3@huawei.com> References: <20221109135008.9485-1-hejunhao3@huawei.com> <20221109135008.9485-3-hejunhao3@huawei.com> Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) MIME-Version: 1.0 X-Originating-IP: [10.45.145.27] X-ClientProxiedBy: lhrpeml500005.china.huawei.com (7.191.163.240) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221109_085731_726939_E8D106C9 X-CRM114-Status: GOOD ( 20.82 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 9 Nov 2022 21:50:08 +0800 Junhao He wrote: > 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 LTGM Reviewed-by: Jonathan Cameron Thanks, Jonathan > --- > .../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..deaefd508105 > --- /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: November 2022 > +KernelVersion: 6.2 > +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: November 2022 > +KernelVersion: 6.2 > +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: November 2022 > +KernelVersion: 6.2 > +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: November 2022 > +KernelVersion: 6.2 > +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: November 2022 > +KernelVersion: 6.2 > +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}, \ > + } \ > + } \ > + }) \ > + } _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel