From patchwork Tue Jan 10 06:37:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sibi Sankar X-Patchwork-Id: 41308 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp2590009wrt; Mon, 9 Jan 2023 22:50:28 -0800 (PST) X-Google-Smtp-Source: AMrXdXu7ibHvXJU5Esl4lFfVtPKahdxJ/vAv4HC+Q5BRKmbHL9pRmAQxQ57nyZLQeBtaMjmszcDI X-Received: by 2002:a17:90a:ab16:b0:226:6d:1a31 with SMTP id m22-20020a17090aab1600b00226006d1a31mr55197634pjq.49.1673333428591; Mon, 09 Jan 2023 22:50:28 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673333428; cv=none; d=google.com; s=arc-20160816; b=W2vgwfV+TOOFIUsgbcpO7ZjpIBLqWllUSGlO+nhjdjgUN+/1i0XM7Oh7k5Syg5xT74 TeWgJllRKj2aFQe7aXAcFNuWepLlUKLdJd0fYms1WVa8cKut2O276eyb9f8ahaoBf86U mou3FQ0y9Irthz1z90XpJXsYCtjD8j46RJKm0i+BBnYpA2RjYXAbAmiXXnviN0CB3LZi ZmAI9f7ofUUyCTYTD15fPluvKH2bTo5iKd38IShkjJDfHQ0iU7LPKEuqN5BRCiTopzwJ E6PvCo1p5xUYmaHLJScZQIkcpqPEw2Uwbay8xeQzOWFDXRNQFAWXzeKQMra0xpwQttYu fZ0A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature; bh=+YgbCYAPSVK90SB97LphXVYIY5ZBmjOJkMcTj+4RzHo=; b=hbDq4o+CnHhNdtpim4PSGNW525LPBaz67W8evSgKS5mVEzm3lWIDjXdVhR/YduM0AU RQtdni8Ify2WzSXSdhX67KnJygvarkSFkagIlQje9+EE8LHEFwOBnCkrt7za5VsBgX/2 gxZ3ej2YbkjDc3o7hze+ATnkHPErA1YkH5ZCXLMEDvl7CREsrBuDU63fm5DXq32JJNM/ H8ncnsE2nuJCl92rIAW50UXnnq+RYwe0+U2eboADZkXHxFLwZgIISYMYZ7AOLUtI7V5C iHyfx618HMzMvcP2rFA3uVjlg/jJzNF+Uzbl81vPEW50Fm7fjXPaAYhn7GICoKn3jrtZ poMw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@quicinc.com header.s=qcppdkim1 header.b=Tfni+lfz; 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=pass (p=NONE sp=NONE dis=NONE) header.from=quicinc.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id my8-20020a17090b4c8800b00225a2269fc8si12217263pjb.185.2023.01.09.22.50.15; Mon, 09 Jan 2023 22:50:28 -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; dkim=pass header.i=@quicinc.com header.s=qcppdkim1 header.b=Tfni+lfz; 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=pass (p=NONE sp=NONE dis=NONE) header.from=quicinc.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234413AbjAJGiu (ORCPT + 99 others); Tue, 10 Jan 2023 01:38:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54334 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231373AbjAJGik (ORCPT ); Tue, 10 Jan 2023 01:38:40 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EBE4B165AF; Mon, 9 Jan 2023 22:38:39 -0800 (PST) Received: from pps.filterd (m0279866.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 30A4lbVD029334; Tue, 10 Jan 2023 06:38:33 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=qcppdkim1; bh=+YgbCYAPSVK90SB97LphXVYIY5ZBmjOJkMcTj+4RzHo=; b=Tfni+lfz1csv+aUZAXO2zNISZ6/k+NZJ+4jtN8qCQJKd3drI6pH9D4pCX62JhvLiyBAh PFZka88+9xduxPIckJ76Rv7tOZMXHb9EGd2RvhJjZojdsZfH/d8ssCth9exyOF2RISza kvjm0IgXL3XG3IOsvW/9iqscKewIny8q/0O2qQbUcF3P0p7d7QlXqQ14eWroxrr+zZW3 3v0JnxItxWkfgmhHOAxa5cY8OMBnBc6bDL/7SJ2x54gume8t5Plm4tDhfd7S8XFvhk0D TsLJQxSF172YXREbsgV5QYEISqYEoTwczwZOzRagiXY7J/PQj0VaCaWUmS8OqV6klgZp Ow== Received: from nalasppmta03.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3my21fvwqs-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 10 Jan 2023 06:38:32 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA03.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 30A6cWeE030417 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 10 Jan 2023 06:38:32 GMT Received: from blr-ubuntu-87.ap.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.36; Mon, 9 Jan 2023 22:38:28 -0800 From: Sibi Sankar To: CC: , , , , , , , , , Sibi Sankar Subject: [PATCH V7 1/2] dt-bindings: firmware: qcom,scm: Add optional interrupt Date: Tue, 10 Jan 2023 12:07:44 +0530 Message-ID: <20230110063745.16739-2-quic_sibis@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230110063745.16739-1-quic_sibis@quicinc.com> References: <20230110063745.16739-1-quic_sibis@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: YFTruunmLwPLcywk55p0ZPnbDva4X82T X-Proofpoint-GUID: YFTruunmLwPLcywk55p0ZPnbDva4X82T X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2023-01-10_01,2023-01-09_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 impostorscore=0 bulkscore=0 malwarescore=0 mlxscore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 priorityscore=1501 mlxlogscore=999 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301100042 X-Spam-Status: No, score=0.5 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW, RCVD_IN_SBL_CSS,SPF_HELO_NONE,SPF_PASS autolearn=no 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?1754617273255396730?= X-GMAIL-MSGID: =?utf-8?q?1754617273255396730?= From: Guru Das Srinagesh Add an interrupt specification to the bindings to support the wait-queue feature on SM8450 SoCs. Signed-off-by: Guru Das Srinagesh Signed-off-by: Sibi Sankar Reviewed-by: Krzysztof Kozlowski --- The interrupt property for scm firmware from a binding perspective is completely optional i.e. not all tz fw running in the wild on sm8450 devices support this feature. The bootloader does the interrupt property addition on sm8450 devices with wait-queue support. v7 - Pick up R-b. v6: - Fix subject of bindings [Krzysztof] - Update commit message to include the SoC supporting the feature [Krzysztof] - Make the interrupt property valid on SM8450 SoC [Krzysztof] - Rebased on Krzysztof's narrow clocks and interconnect series. - Drop R-b v5: - Pick up R-b v4: - Qualify bindings [Krzysztoff] .../devicetree/bindings/firmware/qcom,scm.yaml | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml index 8e6e9ebb343d..01c861f36983 100644 --- a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml +++ b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml @@ -73,6 +73,12 @@ properties: '#reset-cells': const: 1 + interrupts: + description: + The wait-queue interrupt that firmware raises as part of handshake + protocol to handle sleeping SCM calls. + maxItems: 1 + qcom,dload-mode: $ref: /schemas/types.yaml#/definitions/phandle-array items: @@ -162,6 +168,18 @@ allOf: properties: interconnects: false + # Interrupts + - if: + not: + properties: + compatible: + contains: + enum: + - qcom,scm-sm8450 + then: + properties: + interrupts: false + required: - compatible From patchwork Tue Jan 10 06:37:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sibi Sankar X-Patchwork-Id: 41310 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp2591016wrt; Mon, 9 Jan 2023 22:53:54 -0800 (PST) X-Google-Smtp-Source: AMrXdXu6x4jN0WM8eLRXFpJavtocTNhthb7PYz4h9xaZPiIpbNi73aUd6+ZRUylYpM7Fnettbuxt X-Received: by 2002:a05:6a21:6da8:b0:af:d295:e2f0 with SMTP id wl40-20020a056a216da800b000afd295e2f0mr126089540pzb.27.1673333634515; Mon, 09 Jan 2023 22:53:54 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673333634; cv=none; d=google.com; s=arc-20160816; b=FZh+QiyPOMzDPM5nsk/a/icYcPp1oUQMUZQkynKjJX6v4rMzYuIk21M1Aj/QRc1Td3 MODneZHTaVgW1AjY0+lpBksDs0P5SKYqLmJwEqSl2yvqQZB0XoJt998XcSJQQqPoqS8Z 1omIA9awaEipzfI2vNtdkdp3Mi146gy6eKkp4c4+/TNbZH3QPpW61hv21PMcX8oNFdVI M2HJuxQ280qQoIaKdmjLrfivXRY6XwkhK5nEH8px5IIBwDnRn9ke3OSqcO+tWuHELnFS nVv9c6nu+jg/jEdNFGdhXq11JMIr4wt1ByJy/nES296OMjWhWCMs+9Wki8/+IyximsIQ z3sA== 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 :dkim-signature; bh=4ifpfJ4czFoI59wgCzeWXn9EJjC4RGtrhlPglKYiBCI=; b=oCjnQq08lVfYc8QeLPxjhER4SmDtc9jisfYRkTo72oQ0YzMrpYaqhsCobtPuO4wqtH C+2VTqLgNzPWwInAznJVdpphO2yTV41bBsBtcfPxK2Hv806FKjn3WBuDW8M7sDgm9CRx RYEJ+yd6xC7h042rn7nfRKY3D2Btqk9qfQwxkNzSxCcZl+aNC171YHOgvDMgk6oKRAZK msSWNL/2OeZ/z32Xu8KAUk22nR2kJJTS9zow3j1Ie07GNDMWMBUrcQUh35eXCdRF9YeX FKCnc5T22ZJCtnlWYPxOzXLtzaqb6gwqHU6Wa5MTcCvVij2VMkd8zjnpu/nOm6lnnbgs Ua1w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@quicinc.com header.s=qcppdkim1 header.b=Ue1OJEtA; 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=pass (p=NONE sp=NONE dis=NONE) header.from=quicinc.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id n64-20020a632743000000b00478e26efc95si10749020pgn.34.2023.01.09.22.53.41; Mon, 09 Jan 2023 22:53:54 -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; dkim=pass header.i=@quicinc.com header.s=qcppdkim1 header.b=Ue1OJEtA; 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=pass (p=NONE sp=NONE dis=NONE) header.from=quicinc.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230388AbjAJGi5 (ORCPT + 99 others); Tue, 10 Jan 2023 01:38:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54346 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235172AbjAJGio (ORCPT ); Tue, 10 Jan 2023 01:38:44 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 632E0167CF; Mon, 9 Jan 2023 22:38:43 -0800 (PST) Received: from pps.filterd (m0279864.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 30A24CCE011340; Tue, 10 Jan 2023 06:38:36 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type : content-transfer-encoding; s=qcppdkim1; bh=4ifpfJ4czFoI59wgCzeWXn9EJjC4RGtrhlPglKYiBCI=; b=Ue1OJEtAYZCDsYxpCX6EhLk0pJTxcBEERrvQdWPnoOHVnyCUKqAM2cbsiZMuqcrXarA2 6UQYmZ0c+w15P3vI5M2E1F13j1bxhkEgIeKQ6jUHZKggI1IMK7RLBSnemOSkIW8pW89t JiBRYYVl/gbsFRCZ8Oza2HvzSUPpcIAyCn/vurVJNptDhCRmFPR1qh6hdbPEXy5Em0iF r0cP7NANIrB3SEcTb+xhThlQU2tS+1U4N1JJbDXsUXBIfhGgLjNb2XzLNxFJ2VbOJPBw K/tDXuSKHi6uvpOyUL0y4unk8tr+7pANJRTq/hjFzw4RXJMJrlidGBcmOYQKmVatCuOT ag== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3my1wu4vve-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 10 Jan 2023 06:38:36 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 30A6cZa3000477 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 10 Jan 2023 06:38:35 GMT Received: from blr-ubuntu-87.ap.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.36; Mon, 9 Jan 2023 22:38:32 -0800 From: Sibi Sankar To: CC: , , , , , , , , , Sibi Sankar Subject: [PATCH V7 2/2] firmware: qcom: scm: Add wait-queue handling logic Date: Tue, 10 Jan 2023 12:07:45 +0530 Message-ID: <20230110063745.16739-3-quic_sibis@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230110063745.16739-1-quic_sibis@quicinc.com> References: <20230110063745.16739-1-quic_sibis@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: fVoqwO2FHuZJvl2EOAJGjLZ4yA0meRiC X-Proofpoint-GUID: fVoqwO2FHuZJvl2EOAJGjLZ4yA0meRiC X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2023-01-10_01,2023-01-09_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 malwarescore=0 clxscore=1015 mlxscore=0 priorityscore=1501 impostorscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 suspectscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301100042 X-Spam-Status: No, score=0.5 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW, RCVD_IN_SBL_CSS,SPF_HELO_NONE,SPF_PASS autolearn=no 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?1754617488859880594?= X-GMAIL-MSGID: =?utf-8?q?1754617488859880594?= From: Guru Das Srinagesh When the firmware (FW) supports multiple requests per VM, multiple requests from the same/different VM can reach the firmware at the same time. Since the firmware currently being used has limited resources, it guards them with a resource lock and puts requests on a wait-queue internally and signals to HLOS that it is doing so. It does this by returning a new return value in addition to success or error: SCM_WAITQ_SLEEP. A sleeping SCM call can be woken up by an interrupt that the FW raises. 1) SCM_WAITQ_SLEEP: When an SCM call receives this return value instead of success or error, FW has placed this call on a wait-queue and has signalled HLOS to put it to non-interruptible sleep. Along with this return value, FW also passes to HLOS `wq_ctx` - a unique number (UID) identifying the wait-queue that it has put the call on, internally. This is to help HLOS with its own bookkeeping to wake this sleeping call later. Additionally, FW also passes to HLOS `smc_call_ctx` - a UID identifying the SCM call thus being put to sleep. This is also for HLOS' bookkeeping to wake this call up later. These two additional values are passed via the a1 and a2 registers. N.B.: The "ctx" in the above UID names = "context". The handshake mechanism that HLOS uses to talk to FW about wait-queue operations involves two new SMC calls. 1) get_wq_ctx(): Arguments: None Returns: wq_ctx, flags, more_pending Get the wait-queue context, and wake up either one or all of the sleeping SCM calls associated with that wait-queue. Additionally, repeat this if there are more wait-queues that are ready to have their requests woken up (`more_pending`). 2) wq_resume(smc_call_ctx): Arguments: smc_call_ctx HLOS needs to issue this in response to receiving an IRQ, passing to FW the same smc_call_ctx that FW receives from HLOS via the get_wq_ctx() call. (The mechanism to wake a SMC call back up is described in detail below) VM_1 VM_2 Firmware │ │ │ │ │ │ │ │ │ │ │ │ │ REQUEST_1 │ │ ├────────────────────────┼─────────────────────────────────┤ │ │ │ │ │ ┌──┼──┐ │ │ │ │ │ │ │ REQUEST_2 │ │ │ │ ├──────────────────────────────┼──┤ │ │ │ │ │ │Resource │ │ │ │ │is busy │ │ {WQ_SLEEP} │ │ │ │ │◄─────────────────────────────┼──┤ │ │ │ wq_ctx, smc_call_ctx │ │ │ │ │ └──┼──┘ │ REQUEST_1 COMPLETE │ │ │◄───────────────────────┼─────────────────────────────────┤ │ │ │ │ │ IRQ │ │ │◄─-------------------------------│ │ │ │ │ │ get_wq_ctx() │ │ ├────────────────────────────────►│ │ │ │ │ │ │ │ │◄────────────────────────────────┤ │ │ wq_ctx, flags, and │ │ │ more_pending │ │ │ │ │ │ │ │ │ wq_resume(smc_call_ctx) │ │ ├────────────────────────────────►│ │ │ │ │ │ │ │ │ REQUEST_2 COMPLETE │ │ │◄────────────────────────────────┤ │ │ │ │ │ │ With the exception of get_wq_ctx(), the other SMC call wq_resume() can return WQ_SLEEP (these nested rounds of WQ_SLEEP are not shown in the above diagram for the sake of simplicity). Therefore, introduce a new do-while loop to handle multiple WQ_SLEEP return values for the same parent SCM call. Request Completion in the above diagram refers to either a success return value (zero) or error (and not SMC_WAITQ_SLEEP) Also add the interrupt handler that wakes up a sleeping SCM call. Signed-off-by: Guru Das Srinagesh Co-developed-by: Sibi Sankar Signed-off-by: Sibi Sankar --- v7: - Move lookup + wait_for_completion into a single function in qcom_scm [Bjorn] - Simplify completion retrieval [Bjorn] v6: - Fix misc. nits in the scm driver [Krzysztof] v5: - Handle the wake_one/wake_all flags [Guru] - Rename flag handler to qcom_scm_waitq_wakeup [Bjorn] - Resume scm call can return ebusy as well handle that scenario by retrying the original smc call and not the resume call v4: - platform_set_drvdata will be used by __scm_smc_do_quirk_handle_waitq to get access to scm struct from device so retain it - Use a single completion as it satisfies all of the current usecases [Bjorn] - Inline scm_get_wq_ctx [Bjorn] - Convert all pr_err to dev_err [Bjorn] - Handle idr_destroy in a thread safe manner [Bjorn] - Misc. Style fixes [Bjorn] v3: - Fixup irq handling so as not to affect SoCs without the interrupt. - Fix warnings reported by kernel test-bot. drivers/firmware/qcom_scm-smc.c | 90 ++++++++++++++++++++++++++++++--- drivers/firmware/qcom_scm.c | 89 +++++++++++++++++++++++++++++++- drivers/firmware/qcom_scm.h | 8 +++ 3 files changed, 179 insertions(+), 8 deletions(-) diff --git a/drivers/firmware/qcom_scm-smc.c b/drivers/firmware/qcom_scm-smc.c index d111833364ba..30999f04749c 100644 --- a/drivers/firmware/qcom_scm-smc.c +++ b/drivers/firmware/qcom_scm-smc.c @@ -52,29 +52,101 @@ static void __scm_smc_do_quirk(const struct arm_smccc_args *smc, } while (res->a0 == QCOM_SCM_INTERRUPTED); } -static void __scm_smc_do(const struct arm_smccc_args *smc, - struct arm_smccc_res *res, bool atomic) +static void fill_wq_resume_args(struct arm_smccc_args *resume, u32 smc_call_ctx) { - int retry_count = 0; + memset(resume->args, 0, sizeof(resume->args[0]) * ARRAY_SIZE(resume->args)); + + resume->args[0] = ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, + ARM_SMCCC_SMC_64, ARM_SMCCC_OWNER_SIP, + SCM_SMC_FNID(QCOM_SCM_SVC_WAITQ, QCOM_SCM_WAITQ_RESUME)); + + resume->args[1] = QCOM_SCM_ARGS(1); + + resume->args[2] = smc_call_ctx; +} + +int scm_get_wq_ctx(u32 *wq_ctx, u32 *flags, u32 *more_pending) +{ + int ret; + struct arm_smccc_args get_wq_ctx = {0}; + struct arm_smccc_res get_wq_res; + + get_wq_ctx.args[0] = ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, + ARM_SMCCC_SMC_64, ARM_SMCCC_OWNER_SIP, + SCM_SMC_FNID(QCOM_SCM_SVC_WAITQ, QCOM_SCM_WAITQ_GET_WQ_CTX)); + + /* Guaranteed to return only success or error, no WAITQ_* */ + __scm_smc_do_quirk(&get_wq_ctx, &get_wq_res); + ret = get_wq_res.a0; + if (ret) + return ret; + + *wq_ctx = get_wq_res.a1; + *flags = get_wq_res.a2; + *more_pending = get_wq_res.a3; + + return 0; +} + +static int __scm_smc_do_quirk_handle_waitq(struct device *dev, struct arm_smccc_args *waitq, + struct arm_smccc_res *res) +{ + int ret; + struct arm_smccc_args resume; + u32 wq_ctx, smc_call_ctx, flags; + struct arm_smccc_args *smc = waitq; + + do { + __scm_smc_do_quirk(smc, res); + + if (res->a0 == QCOM_SCM_WAITQ_SLEEP) { + wq_ctx = res->a1; + smc_call_ctx = res->a2; + flags = res->a3; + + if (!dev) + return -EPROBE_DEFER; + + ret = qcom_scm_lookup_completion(wq_ctx); + if (ret) + return ret; + + fill_wq_resume_args(&resume, smc_call_ctx); + smc = &resume; + } + } while (res->a0 == QCOM_SCM_WAITQ_SLEEP); + + return 0; +} + +static int __scm_smc_do(struct device *dev, struct arm_smccc_args *smc, + struct arm_smccc_res *res, bool atomic) +{ + int ret, retry_count = 0; if (atomic) { __scm_smc_do_quirk(smc, res); - return; + return 0; } do { mutex_lock(&qcom_scm_lock); - __scm_smc_do_quirk(smc, res); + ret = __scm_smc_do_quirk_handle_waitq(dev, smc, res); mutex_unlock(&qcom_scm_lock); + if (ret) + return ret; + if (res->a0 == QCOM_SCM_V2_EBUSY) { if (retry_count++ > QCOM_SCM_EBUSY_MAX_RETRY) break; msleep(QCOM_SCM_EBUSY_WAIT_MS); } } while (res->a0 == QCOM_SCM_V2_EBUSY); + + return 0; } @@ -83,7 +155,7 @@ int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, struct qcom_scm_res *res, bool atomic) { int arglen = desc->arginfo & 0xf; - int i; + int i, ret; dma_addr_t args_phys = 0; void *args_virt = NULL; size_t alloc_len; @@ -135,13 +207,17 @@ int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, smc.args[SCM_SMC_LAST_REG_IDX] = args_phys; } - __scm_smc_do(&smc, &smc_res, atomic); + /* ret error check follows after args_virt cleanup*/ + ret = __scm_smc_do(dev, &smc, &smc_res, atomic); if (args_virt) { dma_unmap_single(dev, args_phys, alloc_len, DMA_TO_DEVICE); kfree(args_virt); } + if (ret) + return ret; + if (res) { res->result[0] = smc_res.a1; res->result[1] = smc_res.a2; diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c index cdbfe54c8146..19ac506a9b1f 100644 --- a/drivers/firmware/qcom_scm.c +++ b/drivers/firmware/qcom_scm.c @@ -4,6 +4,7 @@ */ #include #include +#include #include #include #include @@ -13,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -33,6 +35,7 @@ struct qcom_scm { struct clk *iface_clk; struct clk *bus_clk; struct icc_path *path; + struct completion waitq_comp; struct reset_controller_dev reset; /* control access to the interconnect path */ @@ -63,6 +66,9 @@ static const u8 qcom_scm_cpu_warm_bits[QCOM_SCM_BOOT_MAX_CPUS] = { BIT(2), BIT(1), BIT(4), BIT(6) }; +#define QCOM_SMC_WAITQ_FLAG_WAKE_ONE BIT(0) +#define QCOM_SMC_WAITQ_FLAG_WAKE_ALL BIT(1) + static const char * const qcom_scm_convention_names[] = { [SMC_CONVENTION_UNKNOWN] = "unknown", [SMC_CONVENTION_ARM_32] = "smc arm 32", @@ -1325,11 +1331,79 @@ bool qcom_scm_is_available(void) } EXPORT_SYMBOL(qcom_scm_is_available); +static struct completion *qcom_scm_lookup_wq(struct qcom_scm *scm, u32 wq_ctx) +{ + /* assert wq_ctx is zero */ + if (wq_ctx != 0) { + dev_err(scm->dev, "No waitqueue found for wq_ctx %d\n", wq_ctx); + return ERR_PTR(-EINVAL); + } + + return &scm->waitq_comp; +} + +int qcom_scm_lookup_completion(u32 wq_ctx) +{ + struct completion *wq = NULL; + + wq = qcom_scm_lookup_wq(__scm, wq_ctx); + if (IS_ERR(wq)) + return PTR_ERR(wq); + + wait_for_completion(wq); + + return 0; +} + +static int qcom_scm_waitq_wakeup(struct qcom_scm *scm, unsigned int wq_ctx, bool wake_all) +{ + struct completion *wq_to_wake; + + wq_to_wake = qcom_scm_lookup_wq(scm, wq_ctx); + if (IS_ERR(wq_to_wake)) + return PTR_ERR(wq_to_wake); + + if (wake_all) + complete_all(wq_to_wake); + else + complete(wq_to_wake); + + return 0; +} + +static irqreturn_t qcom_scm_irq_handler(int irq, void *data) +{ + int ret; + struct qcom_scm *scm = data; + u32 wq_ctx, flags, more_pending = 0; + + do { + ret = scm_get_wq_ctx(&wq_ctx, &flags, &more_pending); + if (ret) { + dev_err(scm->dev, "GET_WQ_CTX SMC call failed: %d\n", ret); + goto out; + } + + if (flags != QCOM_SMC_WAITQ_FLAG_WAKE_ONE && + flags != QCOM_SMC_WAITQ_FLAG_WAKE_ALL) { + dev_err(scm->dev, "Invalid flags found for wq_ctx: %u\n", flags); + goto out; + } + + ret = qcom_scm_waitq_wakeup(scm, wq_ctx, !!(flags & QCOM_SMC_WAITQ_FLAG_WAKE_ALL)); + if (ret) + goto out; + } while (more_pending); + +out: + return IRQ_HANDLED; +} + static int qcom_scm_probe(struct platform_device *pdev) { struct qcom_scm *scm; unsigned long clks; - int ret; + int irq, ret; scm = devm_kzalloc(&pdev->dev, sizeof(*scm), GFP_KERNEL); if (!scm) @@ -1402,6 +1476,19 @@ static int qcom_scm_probe(struct platform_device *pdev) __scm = scm; __scm->dev = &pdev->dev; + init_completion(&__scm->waitq_comp); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + if (irq != -ENXIO) + return irq; + } else { + ret = devm_request_threaded_irq(__scm->dev, irq, NULL, qcom_scm_irq_handler, + IRQF_ONESHOT, "qcom-scm", __scm); + if (ret < 0) + return dev_err_probe(scm->dev, ret, "Failed to request qcom-scm irq\n"); + } + __get_convention(); /* diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h index db3d08a01209..018e9867d55a 100644 --- a/drivers/firmware/qcom_scm.h +++ b/drivers/firmware/qcom_scm.h @@ -60,6 +60,9 @@ struct qcom_scm_res { u64 result[MAX_QCOM_SCM_RETS]; }; +int qcom_scm_lookup_completion(u32 wq_ctx); +int scm_get_wq_ctx(u32 *wq_ctx, u32 *flags, u32 *more_pending); + #define SCM_SMC_FNID(s, c) ((((s) & 0xFF) << 8) | ((c) & 0xFF)) extern int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, enum qcom_scm_convention qcom_convention, @@ -129,6 +132,10 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc, #define QCOM_SCM_SMMU_CONFIG_ERRATA1 0x03 #define QCOM_SCM_SMMU_CONFIG_ERRATA1_CLIENT_ALL 0x02 +#define QCOM_SCM_SVC_WAITQ 0x24 +#define QCOM_SCM_WAITQ_RESUME 0x02 +#define QCOM_SCM_WAITQ_GET_WQ_CTX 0x03 + /* common error codes */ #define QCOM_SCM_V2_EBUSY -12 #define QCOM_SCM_ENOMEM -5 @@ -137,6 +144,7 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc, #define QCOM_SCM_EINVAL_ARG -2 #define QCOM_SCM_ERROR -1 #define QCOM_SCM_INTERRUPTED 1 +#define QCOM_SCM_WAITQ_SLEEP 2 static inline int qcom_scm_remap_error(int err) {