From nobody Wed Dec 17 13:24:43 2025 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 A5676C54FB9 for ; Tue, 21 Nov 2023 09:49:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234182AbjKUJtR (ORCPT ); Tue, 21 Nov 2023 04:49:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36964 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234150AbjKUJtM (ORCPT ); Tue, 21 Nov 2023 04:49:12 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 775C5136; Tue, 21 Nov 2023 01:49:07 -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 3AL9HEmP031563; Tue, 21 Nov 2023 09:49:05 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=vEltVJinW3eU8qaHD9E2kOlua4I5vuIh5vyOxB/sHS0=; b=KS9Mh2sM+FEKgyJ5cW0kKczoCO6LrB1R/9kmhIT1lBJadnxgN9+lEc39E8DF2gOnlO4I Belao7v+paiLnPIlYg4akOMBaX9EzVDNqFGW16AoThBlGJ9n2SeJc4EO9R6IdVXUPeCP 5YfDw2LvkfKYXDjDg9QYyBiW+PPl5m+kQ/UaF2DulhKr3c7ZUlTl+973o4ucleypzqZx Bf7rMgPo4tUAKNlejLXS3DUAch85aHPa1RPN4UNOtokNY9DRC6r8UBCt0wb1UMvwmYfS MKnUhjZ8hOpMlloruCV8Q5ItTWZ9qs2v2uI9FDm2ijnO0j66+eQNPbnVYD8vOdgeHaV3 AA== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3ugsskr1wq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 21 Nov 2023 09:49:05 +0000 Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 3AL9n4Nl017525 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 21 Nov 2023 09:49:04 GMT Received: from hu-ekangupt-hyd.qualcomm.com (10.80.80.8) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Tue, 21 Nov 2023 01:49:02 -0800 From: Ekansh Gupta To: , CC: , Subject: [PATCH v7 5/5] misc: fastrpc: Add support to allocate shared context bank Date: Tue, 21 Nov 2023 15:18:44 +0530 Message-ID: <20231121094844.5764-6-quic_ekangupt@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231121094844.5764-1-quic_ekangupt@quicinc.com> References: <20231121094844.5764-1-quic_ekangupt@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: qQScA2cp1K-fA-DDSQEvE9FFFOp2SETq X-Proofpoint-ORIG-GUID: qQScA2cp1K-fA-DDSQEvE9FFFOp2SETq X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-21_03,2023-11-20_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 adultscore=0 mlxscore=0 spamscore=0 clxscore=1015 malwarescore=0 mlxlogscore=995 priorityscore=1501 impostorscore=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311210076 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Context banks could be set as a shared one using a DT propery "qcom,nsessions". The property takes the number of session to be created of the context bank. This change provides a control mechanism for user to use shared context banks for light weight processes. The session is set as shared while its creation and if a user requests for shared context bank, the same will be allocated during process initialization. Signed-off-by: Ekansh Gupta --- Changes in v7: - Rebase the patch to latest kernel version drivers/misc/fastrpc.c | 122 ++++++++++++++++++++++++------------ include/uapi/misc/fastrpc.h | 12 ++++ 2 files changed, 95 insertions(+), 39 deletions(-) diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index aa0695f9576e..8e77beb3a693 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -297,6 +297,7 @@ struct fastrpc_session_ctx { int sid; bool used; bool valid; + bool sharedcb; }; =20 struct fastrpc_channel_ctx { @@ -344,12 +345,22 @@ struct fastrpc_user { int tgid; int pd; bool is_secure_dev; + bool sharedcb; /* Lock for lists */ spinlock_t lock; /* lock for allocations */ struct mutex mutex; }; =20 +struct fastrpc_ctrl_smmu { + u32 sharedcb; /* Set to SMMU share context bank */ +}; + +struct fastrpc_internal_control { + u32 req; + struct fastrpc_ctrl_smmu smmu; +}; + static inline int64_t getnstimediff(struct timespec64 *start) { int64_t ns; @@ -851,6 +862,37 @@ static const struct dma_buf_ops fastrpc_dma_buf_ops = =3D { .release =3D fastrpc_release, }; =20 +static struct fastrpc_session_ctx *fastrpc_session_alloc( + struct fastrpc_channel_ctx *cctx, bool sharedcb) +{ + struct fastrpc_session_ctx *session =3D NULL; + unsigned long flags; + int i; + + spin_lock_irqsave(&cctx->lock, flags); + for (i =3D 0; i < cctx->sesscount; i++) { + if (!cctx->session[i].used && cctx->session[i].valid && + cctx->session[i].sharedcb =3D=3D sharedcb) { + cctx->session[i].used =3D true; + session =3D &cctx->session[i]; + break; + } + } + spin_unlock_irqrestore(&cctx->lock, flags); + + return session; +} + +static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx, + struct fastrpc_session_ctx *session) +{ + unsigned long flags; + + spin_lock_irqsave(&cctx->lock, flags); + session->used =3D false; + spin_unlock_irqrestore(&cctx->lock, flags); +} + static int fastrpc_map_create(struct fastrpc_user *fl, int fd, u64 len, u32 attr, struct fastrpc_map **ppmap) { @@ -1448,6 +1490,10 @@ static int fastrpc_init_create_static_process(struct= fastrpc_user *fl, goto err_name; } =20 + fl->sctx =3D fastrpc_session_alloc(fl->cctx, fl->sharedcb); + if (!fl->sctx) + return -EBUSY; + if (!fl->cctx->remote_heap) { err =3D fastrpc_remote_heap_alloc(fl, fl->sctx->dev, init.memlen, &fl->cctx->remote_heap); @@ -1570,6 +1616,10 @@ static int fastrpc_init_create_process(struct fastrp= c_user *fl, goto err; } =20 + fl->sctx =3D fastrpc_session_alloc(fl->cctx, fl->sharedcb); + if (!fl->sctx) + return -EBUSY; + inbuf.pgid =3D fl->tgid; inbuf.namelen =3D strlen(current->comm) + 1; inbuf.filelen =3D init.filelen; @@ -1644,36 +1694,6 @@ static int fastrpc_init_create_process(struct fastrp= c_user *fl, return err; } =20 -static struct fastrpc_session_ctx *fastrpc_session_alloc( - struct fastrpc_channel_ctx *cctx) -{ - struct fastrpc_session_ctx *session =3D NULL; - unsigned long flags; - int i; - - spin_lock_irqsave(&cctx->lock, flags); - for (i =3D 0; i < cctx->sesscount; i++) { - if (!cctx->session[i].used && cctx->session[i].valid) { - cctx->session[i].used =3D true; - session =3D &cctx->session[i]; - break; - } - } - spin_unlock_irqrestore(&cctx->lock, flags); - - return session; -} - -static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx, - struct fastrpc_session_ctx *session) -{ - unsigned long flags; - - spin_lock_irqsave(&cctx->lock, flags); - session->used =3D false; - spin_unlock_irqrestore(&cctx->lock, flags); -} - static void fastrpc_context_list_free(struct fastrpc_user *fl) { struct fastrpc_invoke_ctx *ctx, *n; @@ -1777,15 +1797,6 @@ static int fastrpc_device_open(struct inode *inode, = struct file *filp) fl->cctx =3D cctx; fl->is_secure_dev =3D fdevice->secure; =20 - fl->sctx =3D fastrpc_session_alloc(cctx); - if (!fl->sctx) { - dev_err(&cctx->rpdev->dev, "No session available\n"); - mutex_destroy(&fl->mutex); - kfree(fl); - - return -EBUSY; - } - spin_lock_irqsave(&cctx->lock, flags); list_add_tail(&fl->user, &cctx->users); spin_unlock_irqrestore(&cctx->lock, flags); @@ -1844,6 +1855,10 @@ static int fastrpc_init_attach(struct fastrpc_user *= fl, int pd) struct fastrpc_enhanced_invoke ioctl; int tgid =3D fl->tgid; =20 + fl->sctx =3D fastrpc_session_alloc(fl->cctx, fl->sharedcb); + if (!fl->sctx) + return -EBUSY; + args[0].ptr =3D (u64)(uintptr_t) &tgid; args[0].length =3D sizeof(tgid); args[0].fd =3D -1; @@ -1890,11 +1905,33 @@ static int fastrpc_invoke(struct fastrpc_user *fl, = char __user *argp) return err; } =20 +static int fastrpc_internal_control(struct fastrpc_user *fl, + struct fastrpc_internal_control *cp) +{ + int err =3D 0; + + if (!fl) + return -EBADF; + if (!cp) + return -EINVAL; + + switch (cp->req) { + case FASTRPC_CONTROL_SMMU: + fl->sharedcb =3D cp->smmu.sharedcb; + break; + default: + err =3D -EBADRQC; + break; + } + return err; +} + static int fastrpc_multimode_invoke(struct fastrpc_user *fl, char __user *= argp) { struct fastrpc_enhanced_invoke einv; struct fastrpc_invoke_args *args =3D NULL; struct fastrpc_ioctl_multimode_invoke invoke; + struct fastrpc_internal_control cp =3D {0}; u32 nscalars; u64 *perf_kernel; int err, i; @@ -1938,6 +1975,12 @@ static int fastrpc_multimode_invoke(struct fastrpc_u= ser *fl, char __user *argp) err =3D fastrpc_internal_invoke(fl, false, &einv); kfree(args); break; + case FASTRPC_INVOKE_CONTROL: + if (copy_from_user(&cp, (void __user *)(uintptr_t)invoke.invparam, sizeo= f(cp))) + return -EFAULT; + + err =3D fastrpc_internal_control(fl, &cp); + break; default: err =3D -ENOTTY; break; @@ -2440,6 +2483,7 @@ static int fastrpc_cb_probe(struct platform_device *p= dev) if (sessions > 0) { struct fastrpc_session_ctx *dup_sess; =20 + sess->sharedcb =3D true; for (i =3D 1; i < sessions; i++) { if (cctx->sesscount >=3D FASTRPC_MAX_SESSIONS) break; diff --git a/include/uapi/misc/fastrpc.h b/include/uapi/misc/fastrpc.h index 074675ee646f..3dfd8e95eda8 100644 --- a/include/uapi/misc/fastrpc.h +++ b/include/uapi/misc/fastrpc.h @@ -166,6 +166,18 @@ struct fastrpc_ioctl_capability { __u32 reserved[4]; }; =20 +enum fastrpc_control_type { + FASTRPC_CONTROL_LATENCY =3D 1, + FASTRPC_CONTROL_SMMU =3D 2, + FASTRPC_CONTROL_KALLOC =3D 3, + FASTRPC_CONTROL_WAKELOCK =3D 4, + FASTRPC_CONTROL_PM =3D 5, + FASTRPC_CONTROL_DSPPROCESS_CLEAN =3D 6, + FASTRPC_CONTROL_RPC_POLL =3D 7, + FASTRPC_CONTROL_ASYNC_WAKE =3D 8, + FASTRPC_CONTROL_NOTIF_WAKE =3D 9, +}; + enum fastrpc_perfkeys { PERF_COUNT =3D 0, PERF_RESERVED1 =3D 1, --=20 2.17.1