From patchwork Mon Sep 11 19:43:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikunj Kela X-Patchwork-Id: 721519 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7D98CA0EC3 for ; Mon, 11 Sep 2023 21:20:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344426AbjIKVOF (ORCPT ); Mon, 11 Sep 2023 17:14:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50046 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244240AbjIKTom (ORCPT ); Mon, 11 Sep 2023 15:44:42 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A0F3018D; Mon, 11 Sep 2023 12:44:37 -0700 (PDT) Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 38BFumkc012994; Mon, 11 Sep 2023 19:44:29 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=mgi3HTFjixu9MZpChz8Nvq4m/bMxQQbtlB2jCrztIyo=; b=j5nQZ8nqVmdsJwiShQBDI2T2RS/xm3MJkfDl3YVEWFxVqNmA0WV2SE7XuCHDpRLH9+g4 6bcRtVyzB4NYGwLy3JhzXxS9hpC9HXh7Z+Ut+iGpEEqLxj3m2b4HnYvf3GhHl2rvX8Sj OTPIehKpoXod7aDgQgdmmSubP98wzqfqe76El42A+tUPhxph8oKk9MXLu6TRerKS0zES 8fOZiBT0dFhN+XaTpKSnxy8FKj4Tq6Z2snlwR6VnzJG6LRQA2lFPCHwMQr7yU1vuSzxO xtriTQ7WB6CHrF9741fS/wl9Z7EioGawWvehL/9oLiTrgMxoRhgHrbjBYaeLSPw2hFlv Ig== Received: from nalasppmta04.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3t25yx0hk2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 11 Sep 2023 19:44:29 +0000 Received: from nalasex01c.na.qualcomm.com (nalasex01c.na.qualcomm.com [10.47.97.35]) by NALASPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 38BJiS9s015364 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 11 Sep 2023 19:44:28 GMT Received: from car-linux11.qualcomm.com (10.80.80.8) by nalasex01c.na.qualcomm.com (10.47.97.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Mon, 11 Sep 2023 12:44:28 -0700 From: Nikunj Kela To: CC: , , , , , , , , , , Nikunj Kela Subject: [PATCH v4 4/4] firmware: arm_scmi: Add qcom hvc/shmem transport support Date: Mon, 11 Sep 2023 12:43:59 -0700 Message-ID: <20230911194359.27547-5-quic_nkela@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230911194359.27547-1-quic_nkela@quicinc.com> References: <20230718160833.36397-1-quic_nkela@quicinc.com> <20230911194359.27547-1-quic_nkela@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01c.na.qualcomm.com (10.47.97.35) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: cWCo3C-4s9oE985TCAboIMaTT-9qrCzp X-Proofpoint-GUID: cWCo3C-4s9oE985TCAboIMaTT-9qrCzp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-11_15,2023-09-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 spamscore=0 clxscore=1015 mlxlogscore=999 bulkscore=0 lowpriorityscore=0 priorityscore=1501 malwarescore=0 suspectscore=0 adultscore=0 impostorscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2309110180 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org This change adds the support for SCMI message exchange on Qualcomm virtual platforms. The hypervisor associates an object-id also known as capability-id with each hvc doorbell object. The capability-id is used to identify the doorbell from the VM's capability namespace, similar to a file-descriptor. The hypervisor, in addition to the function-id, expects the capability-id to be passed in x1 register when HVC call is invoked. The function-id & capability-id are allocated by the hypervisor on bootup and are stored in the shmem region by the firmware before starting Linux. Signed-off-by: Nikunj Kela --- drivers/firmware/arm_scmi/driver.c | 1 + drivers/firmware/arm_scmi/smc.c | 47 ++++++++++++++++++++++++++---- 2 files changed, 43 insertions(+), 5 deletions(-) diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index 87383c05424b..ea344bc6ae49 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -2915,6 +2915,7 @@ static const struct of_device_id scmi_of_match[] = { #ifdef CONFIG_ARM_SCMI_TRANSPORT_SMC { .compatible = "arm,scmi-smc", .data = &scmi_smc_desc}, { .compatible = "arm,scmi-smc-param", .data = &scmi_smc_desc}, + { .compatible = "qcom,scmi-hvc-shmem", .data = &scmi_smc_desc}, #endif #ifdef CONFIG_ARM_SCMI_TRANSPORT_VIRTIO { .compatible = "arm,scmi-virtio", .data = &scmi_virtio_desc}, diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c index 0a0b7e401159..94ec07fdc14a 100644 --- a/drivers/firmware/arm_scmi/smc.c +++ b/drivers/firmware/arm_scmi/smc.c @@ -50,6 +50,9 @@ * @func_id: smc/hvc call function id * @param_page: 4K page number of the shmem channel * @param_offset: Offset within the 4K page of the shmem channel + * @cap_id: hvc doorbell's capability id to be used on Qualcomm virtual + * platforms + * @qcom_xport: Flag to indicate the transport on Qualcomm virtual platforms */ struct scmi_smc { @@ -63,6 +66,8 @@ struct scmi_smc { u32 func_id; u32 param_page; u32 param_offset; + u64 cap_id; + bool qcom_xport; }; static irqreturn_t smc_msg_done_isr(int irq, void *data) @@ -129,6 +134,7 @@ static int smc_chan_setup(struct scmi_chan_info *cinfo, struct device *dev, struct resource res; struct device_node *np; u32 func_id; + u64 cap_id; int ret; if (!tx) @@ -158,9 +164,34 @@ static int smc_chan_setup(struct scmi_chan_info *cinfo, struct device *dev, return -EADDRNOTAVAIL; } - ret = of_property_read_u32(dev->of_node, "arm,smc-id", &func_id); - if (ret < 0) - return ret; + if (of_device_is_compatible(dev->of_node, "qcom,scmi-hvc-shmem")) { + scmi_info->qcom_xport = true; + + /* The func-id & capability-id are kept in last 16 bytes of shmem. + * +-------+ + * | | + * | shmem | + * | | + * | | + * +-------+ <-- (size - 16) + * | funcId| + * +-------+ <-- (size - 8) + * | capId | + * +-------+ <-- size + */ + + func_id = readl((void __iomem *)(scmi_info->shmem) + size - 16); +#ifdef CONFIG_ARM64 + cap_id = readq((void __iomem *)(scmi_info->shmem) + size - 8); +#else + /* capability-id is 32 bit wide on 32bit machines */ + cap_id = readl((void __iomem *)(scmi_info->shmem) + size - 8); +#endif + } else { + ret = of_property_read_u32(dev->of_node, "arm,smc-id", &func_id); + if (ret < 0) + return ret; + } if (of_device_is_compatible(dev->of_node, "arm,scmi-smc-param")) { scmi_info->param_page = SHMEM_PAGE(res.start); @@ -184,6 +215,7 @@ static int smc_chan_setup(struct scmi_chan_info *cinfo, struct device *dev, } scmi_info->func_id = func_id; + scmi_info->cap_id = cap_id; scmi_info->cinfo = cinfo; smc_channel_lock_init(scmi_info); cinfo->transport_info = scmi_info; @@ -213,6 +245,7 @@ static int smc_send_message(struct scmi_chan_info *cinfo, struct arm_smccc_res res; unsigned long page = scmi_info->param_page; unsigned long offset = scmi_info->param_offset; + unsigned long cap_id = (unsigned long)scmi_info->cap_id; /* * Channel will be released only once response has been @@ -222,8 +255,12 @@ static int smc_send_message(struct scmi_chan_info *cinfo, shmem_tx_prepare(scmi_info->shmem, xfer, cinfo); - arm_smccc_1_1_invoke(scmi_info->func_id, page, offset, 0, 0, 0, 0, 0, - &res); + if (scmi_info->qcom_xport) + arm_smccc_1_1_hvc(scmi_info->func_id, cap_id, 0, 0, 0, 0, 0, 0, + &res); + else + arm_smccc_1_1_invoke(scmi_info->func_id, page, offset, 0, 0, 0, + 0, 0, &res); /* Only SMCCC_RET_NOT_SUPPORTED is valid error code */ if (res.a0) {