From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx48Y8vXcmlSZzhzKH430c5A7Hv/UP+zIcQrRQQyC7Y6SGGhu6PGNJIsP9hbAdyMpq+5ibK3J ARC-Seal: i=1; a=rsa-sha256; t=1524013869; cv=none; d=google.com; s=arc-20160816; b=rgPumSePGdtl+OMrs4Il/f5XepnNCDomYWIBnJ+wt4WE4UzMq7LoUSmogRXjEhghJu RQhK71Bmg0/6XVe27GzkMtR6uFdRssbVw2Gr1ELnkp2oPOT4cD/LyZO+YXPurYy5mtVk Xv34AJIvwT3MlJIdBGLM35qlohK4tXcdMOf1VS/Ymn2P430HXCLZ5W6E5RJhXHvlJJiP vJHoRxGAsLwN3auWY1hL+xE47b17nhoQsunnPZDDWQdENi4+QPQTGBt83H+oidXPa9+w t28c6m7ScJJWXHfUMW4r50uCbwP46fL7eGcbXNaC1WE6f5NTbK3Y2wCloeZVIXNnqOg8 q9fg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=message-id:references:in-reply-to:date:subject:cc:to:from :arc-authentication-results; bh=k0FVK6ODpp6paOU5ptI+KBwYVy3+ze5bhVZoQNjOlkA=; b=VaqPW7NBu3V+hFoI3ALgDDpfDiNRo70gyCf5MWO3nU2nD2SnIpqm/+LzfHnR8/fD+r GjDpsdBt6LzJUgVvcta1OkDdyuiPdto0LpRgB80pIQXRWPD5iAR0y0DeeffFaZSUocY+ 7bPJ3CbVtyele5+WreTOhDs0QMObdirSx/RaFnqX+IgiF09uvF7E8dSUvicgkWTGSk/I UIBgVZD5J/ycKLXdknyUz+Z7rAjxw+W1989PEce2b9BEUVFB0dUua+tiJvt3ZbKwpUQs jr9jDzBLPoYyJN1vtL29LO1H0EhlVxmwVcMORh8lIqYjFunHwlF2Q4jJGWx00D201ydP gyCA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of alastair@au1.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=alastair@au1.ibm.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=ibm.com Authentication-Results: mx.google.com; spf=pass (google.com: domain of alastair@au1.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=alastair@au1.ibm.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=ibm.com From: "Alastair D'Silva" To: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, mikey@neuling.org, vaibhav@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, malat@debian.org, felix@linux.vnet.ibm.com, pombredanne@nexb.com, sukadev@linux.vnet.ibm.com, npiggin@gmail.com, gregkh@linuxfoundation.org, arnd@arndb.de, andrew.donnellan@au1.ibm.com, fbarrat@linux.vnet.ibm.com, corbet@lwn.net, "Alastair D'Silva" Subject: [PATCH v2 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI Date: Wed, 18 Apr 2018 11:08:03 +1000 X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180417020950.21446-1-alastair@au1.ibm.com> References: <20180417020950.21446-1-alastair@au1.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18041801-0012-0000-0000-000005CC01F5 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18041801-0013-0000-0000-000019484F7C Message-Id: <20180418010810.30937-1-alastair@au1.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-04-17_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1804180008 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1597957545708610208?= X-GMAIL-MSGID: =?utf-8?q?1598044367703785699?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Alastair D'Silva The Power 9 as_notify/wait feature provides a lower latency way to signal a thread that work is complete. This series enables the use of this feature from OpenCAPI adapters, as well as addressing a potential starvation issue when allocating thread IDs. Changelog: v2: Rename get_platform IOCTL to get_features Move stray edit from patch 1 to patch 3 Alastair D'Silva (7): powerpc: Add TIDR CPU feature for Power9 powerpc: Use TIDR CPU feature to control TIDR allocation powerpc: use task_pid_nr() for TID allocation ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action ocxl: Expose the thread_id needed for wait on p9 ocxl: Add an IOCTL so userspace knows what CPU features are available ocxl: Document new OCXL IOCTLs Documentation/accelerators/ocxl.rst | 10 ++++ arch/powerpc/include/asm/cputable.h | 3 +- arch/powerpc/include/asm/pnv-ocxl.h | 2 +- arch/powerpc/include/asm/switch_to.h | 1 - arch/powerpc/kernel/dt_cpu_ftrs.c | 1 + arch/powerpc/kernel/process.c | 101 +--------------------------------- arch/powerpc/platforms/powernv/ocxl.c | 4 +- drivers/misc/ocxl/context.c | 5 +- drivers/misc/ocxl/file.c | 78 ++++++++++++++++++++++++++ drivers/misc/ocxl/link.c | 38 ++++++++++++- drivers/misc/ocxl/ocxl_internal.h | 1 + include/misc/ocxl.h | 9 +++ include/uapi/misc/ocxl.h | 14 +++++ 13 files changed, 162 insertions(+), 105 deletions(-) -- 2.14.3 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-5.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id 7FA8A7DE74 for ; Wed, 18 Apr 2018 01:11:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753412AbeDRBLL (ORCPT ); Tue, 17 Apr 2018 21:11:11 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:38710 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753186AbeDRBLI (ORCPT ); Tue, 17 Apr 2018 21:11:08 -0400 Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w3I19OAH067887 for ; Tue, 17 Apr 2018 21:11:08 -0400 Received: from e06smtp13.uk.ibm.com (e06smtp13.uk.ibm.com [195.75.94.109]) by mx0a-001b2d01.pphosted.com with ESMTP id 2hds1p6jb4-1 (version=TLSv1.2 cipher=AES256-SHA256 bits=256 verify=NOT) for ; Tue, 17 Apr 2018 21:11:07 -0400 Received: from localhost by e06smtp13.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Wed, 18 Apr 2018 02:11:01 +0100 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w3I1B14L56295536; Wed, 18 Apr 2018 01:11:01 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1220611C054; Wed, 18 Apr 2018 02:02:57 +0100 (BST) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AFDC911C04C; Wed, 18 Apr 2018 02:02:56 +0100 (BST) Received: from ozlabs.au.ibm.com (unknown [9.192.253.14]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 18 Apr 2018 02:02:56 +0100 (BST) Received: from adsilva.ozlabs.ibm.com (haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 81EE6A0195; Wed, 18 Apr 2018 11:10:59 +1000 (AEST) From: "Alastair D'Silva" To: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, mikey@neuling.org, vaibhav@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, malat@debian.org, felix@linux.vnet.ibm.com, pombredanne@nexb.com, sukadev@linux.vnet.ibm.com, npiggin@gmail.com, gregkh@linuxfoundation.org, arnd@arndb.de, andrew.donnellan@au1.ibm.com, fbarrat@linux.vnet.ibm.com, corbet@lwn.net, "Alastair D'Silva" Subject: [PATCH v2 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI Date: Wed, 18 Apr 2018 11:08:03 +1000 X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180417020950.21446-1-alastair@au1.ibm.com> References: <20180417020950.21446-1-alastair@au1.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18041801-0012-0000-0000-000005CC01F5 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18041801-0013-0000-0000-000019484F7C Message-Id: <20180418010810.30937-1-alastair@au1.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-04-17_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1804180008 Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org From: Alastair D'Silva The Power 9 as_notify/wait feature provides a lower latency way to signal a thread that work is complete. This series enables the use of this feature from OpenCAPI adapters, as well as addressing a potential starvation issue when allocating thread IDs. Changelog: v2: Rename get_platform IOCTL to get_features Move stray edit from patch 1 to patch 3 Alastair D'Silva (7): powerpc: Add TIDR CPU feature for Power9 powerpc: Use TIDR CPU feature to control TIDR allocation powerpc: use task_pid_nr() for TID allocation ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action ocxl: Expose the thread_id needed for wait on p9 ocxl: Add an IOCTL so userspace knows what CPU features are available ocxl: Document new OCXL IOCTLs Documentation/accelerators/ocxl.rst | 10 ++++ arch/powerpc/include/asm/cputable.h | 3 +- arch/powerpc/include/asm/pnv-ocxl.h | 2 +- arch/powerpc/include/asm/switch_to.h | 1 - arch/powerpc/kernel/dt_cpu_ftrs.c | 1 + arch/powerpc/kernel/process.c | 101 +--------------------------------- arch/powerpc/platforms/powernv/ocxl.c | 4 +- drivers/misc/ocxl/context.c | 5 +- drivers/misc/ocxl/file.c | 78 ++++++++++++++++++++++++++ drivers/misc/ocxl/link.c | 38 ++++++++++++- drivers/misc/ocxl/ocxl_internal.h | 1 + include/misc/ocxl.h | 9 +++ include/uapi/misc/ocxl.h | 14 +++++ 13 files changed, 162 insertions(+), 105 deletions(-) -- 2.14.3 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html