From patchwork Tue Oct 17 09:26:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ekansh Gupta X-Patchwork-Id: 735793 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 8B5F5CDB484 for ; Tue, 17 Oct 2023 09:27:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343507AbjJQJ1F (ORCPT ); Tue, 17 Oct 2023 05:27:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36252 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343503AbjJQJ1E (ORCPT ); Tue, 17 Oct 2023 05:27:04 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D5B92E8; Tue, 17 Oct 2023 02:27:01 -0700 (PDT) Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 39H8HNw3014863; Tue, 17 Oct 2023 09:27:00 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=l6/9+G/UtuYARY2q8jXc8UIxNO/ujrI0oO94sHht4rU=; b=KMqj4XNv+VgIibhoXCtZjMNSGnwM/hXlR1sJPRHBd2xqlj95GpdTx8V7A12EVuBoQS7y zGt+NspEI0St+aezOfuxLE4w+bfxxgl76FkKjeZHJqy5slr3Num6YyDualCGT5tTzujN lSeIm1d9cpKRa0XqNoV9HbqKFA93HJaNJwCXky2xJdMiyi1XtdtxAlEnQ/fQxc+pkMU5 9WTBFi2Hud1D2CoVfnEqPY+qqzwZ3+Uflf+3flBjWAZ2Svo3fdFsoam0cpe+FaW7YpBK 6xooVSy6FeDq+w71NYAYNrIFUtWU0q367MnO9WsP4Fv7vApug8zgXclC8yBjk2h9HOw6 bQ== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3tsaf0sqgm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Oct 2023 09:26:59 +0000 Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 39H9QwY5001000 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Oct 2023 09:26:58 GMT Received: from ekangupt-linux.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 15.2.1118.39; Tue, 17 Oct 2023 02:26:55 -0700 From: Ekansh Gupta To: , CC: Ekansh Gupta , , , , Subject: [PATCH v4 4/5] misc: fastrpc: Add support to save and restore interrupted Date: Tue, 17 Oct 2023 14:56:38 +0530 Message-ID: <1697534799-5124-5-git-send-email-quic_ekangupt@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1697534799-5124-1-git-send-email-quic_ekangupt@quicinc.com> References: <1697534799-5124-1-git-send-email-quic_ekangupt@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) 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: lPcH7xcuzLMczeYlOk6jRE0tOSnYX-oo X-Proofpoint-ORIG-GUID: lPcH7xcuzLMczeYlOk6jRE0tOSnYX-oo X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-16_13,2023-10-12_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 suspectscore=0 priorityscore=1501 bulkscore=0 adultscore=0 mlxlogscore=999 malwarescore=0 mlxscore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310170078 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org For any remote call, driver sends a message to DSP using RPMSG framework. After message is sent, there is a wait on a completion object at driver which is completed when DSP response is received. There is a possibility that a signal is received while waiting causing the wait function to return -ERESTARTSYS. In this case the context should be saved and it should get restored for the next invocation for the thread. Adding changes to support saving and restoring of interrupted fastrpc contexts. Signed-off-by: Ekansh Gupta Change-Id: Ia101acf7c1bf6018635536082bf7ea009093c948 --- Changes in v2: - Fixed missing definition - Fixes compile time issue drivers/misc/fastrpc.c | 99 ++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 83 insertions(+), 16 deletions(-) diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index b9822c1..9a481ac 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -333,6 +333,7 @@ struct fastrpc_user { struct list_head user; struct list_head maps; struct list_head pending; + struct list_head interrupted; struct list_head mmaps; struct fastrpc_channel_ctx *cctx; @@ -712,6 +713,40 @@ static struct fastrpc_invoke_ctx *fastrpc_context_alloc( return ERR_PTR(ret); } +static struct fastrpc_invoke_ctx *fastrpc_context_restore_interrupted( + struct fastrpc_user *fl, struct fastrpc_invoke *inv) +{ + struct fastrpc_invoke_ctx *ctx = NULL, *ictx = NULL, *n; + + spin_lock(&fl->lock); + list_for_each_entry_safe(ictx, n, &fl->interrupted, node) { + if (ictx->pid == current->pid) { + if (inv->sc != ictx->sc || ictx->fl != fl) { + dev_err(ictx->fl->sctx->dev, + "interrupted sc (0x%x) or fl (%pK) does not match with invoke sc (0x%x) or fl (%pK)\n", + ictx->sc, ictx->fl, inv->sc, fl); + spin_unlock(&fl->lock); + return ERR_PTR(-EINVAL); + } + ctx = ictx; + list_del(&ctx->node); + list_add_tail(&ctx->node, &fl->pending); + break; + } + } + spin_unlock(&fl->lock); + return ctx; +} + +static void fastrpc_context_save_interrupted( + struct fastrpc_invoke_ctx *ctx) +{ + spin_lock(&ctx->fl->lock); + list_del(&ctx->node); + list_add_tail(&ctx->node, &ctx->fl->interrupted); + spin_unlock(&ctx->fl->lock); +} + static struct sg_table * fastrpc_map_dma_buf(struct dma_buf_attachment *attachment, enum dma_data_direction dir) @@ -1264,6 +1299,14 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel, return -EPERM; } + if (!kernel) { + ctx = fastrpc_context_restore_interrupted(fl, inv); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + if (ctx) + goto wait; + } + ctx = fastrpc_context_alloc(fl, kernel, sc, invoke); if (IS_ERR(ctx)) return PTR_ERR(ctx); @@ -1287,6 +1330,7 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel, goto bail; PERF_END); +wait: if (kernel) { if (!wait_for_completion_timeout(&ctx->work, 10 * HZ)) err = -ETIMEDOUT; @@ -1323,6 +1367,9 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel, } if (err == -ERESTARTSYS) { + if (ctx) + fastrpc_context_save_interrupted(ctx); + list_for_each_entry_safe(buf, b, &fl->mmaps, node) { list_del(&buf->node); list_add_tail(&buf->node, &fl->cctx->invoke_interrupted_mmaps); @@ -1444,7 +1491,7 @@ static int fastrpc_init_create_static_process(struct fastrpc_user *fl, ioctl.inv.handle = FASTRPC_INIT_HANDLE; ioctl.inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_STATIC, 3, 0); - ioctl.inv.args = (__u64)args; + ioctl.inv.args = (u64)args; err = fastrpc_internal_invoke(fl, true, &ioctl); if (err) @@ -1577,7 +1624,7 @@ static int fastrpc_init_create_process(struct fastrpc_user *fl, ioctl.inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0); if (init.attrs) ioctl.inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 4, 0); - ioctl.inv.args = (__u64)args; + ioctl.inv.args = (u64)args; err = fastrpc_internal_invoke(fl, true, &ioctl); if (err) @@ -1628,6 +1675,25 @@ static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx, spin_unlock_irqrestore(&cctx->lock, flags); } +static void fastrpc_context_list_free(struct fastrpc_user *fl) +{ + struct fastrpc_invoke_ctx *ctx, *n; + + list_for_each_entry_safe(ctx, n, &fl->interrupted, node) { + spin_lock(&fl->lock); + list_del(&ctx->node); + spin_unlock(&fl->lock); + fastrpc_context_put(ctx); + } + + list_for_each_entry_safe(ctx, n, &fl->pending, node) { + spin_lock(&fl->lock); + list_del(&ctx->node); + spin_unlock(&fl->lock); + fastrpc_context_put(ctx); + } +} + static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl) { struct fastrpc_invoke_args args[1]; @@ -1641,7 +1707,7 @@ static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl) ioctl.inv.handle = FASTRPC_INIT_HANDLE; ioctl.inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0); - ioctl.inv.args = (__u64)args; + ioctl.inv.args = (u64)args; return fastrpc_internal_invoke(fl, true, &ioctl); } @@ -1650,7 +1716,6 @@ static int fastrpc_device_release(struct inode *inode, struct file *file) { struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data; struct fastrpc_channel_ctx *cctx = fl->cctx; - struct fastrpc_invoke_ctx *ctx, *n; struct fastrpc_map *map, *m; struct fastrpc_buf *buf, *b; unsigned long flags; @@ -1664,10 +1729,7 @@ static int fastrpc_device_release(struct inode *inode, struct file *file) if (fl->init_mem) fastrpc_buf_free(fl->init_mem); - list_for_each_entry_safe(ctx, n, &fl->pending, node) { - list_del(&ctx->node); - fastrpc_context_put(ctx); - } + fastrpc_context_list_free(fl); list_for_each_entry_safe(map, m, &fl->maps, node) fastrpc_map_put(map); @@ -1708,6 +1770,7 @@ static int fastrpc_device_open(struct inode *inode, struct file *filp) spin_lock_init(&fl->lock); mutex_init(&fl->mutex); INIT_LIST_HEAD(&fl->pending); + INIT_LIST_HEAD(&fl->interrupted); INIT_LIST_HEAD(&fl->maps); INIT_LIST_HEAD(&fl->mmaps); INIT_LIST_HEAD(&fl->user); @@ -1789,7 +1852,7 @@ static int fastrpc_init_attach(struct fastrpc_user *fl, int pd) ioctl.inv.handle = FASTRPC_INIT_HANDLE; ioctl.inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0); - ioctl.inv.args = (__u64)args; + ioctl.inv.args = (u64)args; return fastrpc_internal_invoke(fl, true, &ioctl); } @@ -1820,7 +1883,7 @@ static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp) } ioctl.inv = inv; - ioctl.inv.args = (__u64)args; + ioctl.inv.args = (u64)args; err = fastrpc_internal_invoke(fl, false, &ioctl); kfree(args); @@ -1872,7 +1935,7 @@ static int fastrpc_multimode_invoke(struct fastrpc_user *fl, char __user *argp) perf_kernel = (u64 *)(uintptr_t)einv.perf_kernel; if (perf_kernel) fl->profile = true; - einv.inv.args = (__u64)args; + einv.inv.args = (u64)args; err = fastrpc_internal_invoke(fl, false, &einv); kfree(args); break; @@ -1902,7 +1965,7 @@ static int fastrpc_get_info_from_dsp(struct fastrpc_user *fl, uint32_t *dsp_attr ioctl.inv.handle = FASTRPC_DSP_UTILITIES_HANDLE; ioctl.inv.sc = FASTRPC_SCALARS(0, 1, 1); - ioctl.inv.args = (__u64)args; + ioctl.inv.args = (u64)args; return fastrpc_internal_invoke(fl, true, &ioctl); } @@ -2005,7 +2068,7 @@ static int fastrpc_req_munmap_impl(struct fastrpc_user *fl, struct fastrpc_buf * ioctl.inv.handle = FASTRPC_INIT_HANDLE; ioctl.inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MUNMAP, 1, 0); - ioctl.inv.args = (__u64)args; + ioctl.inv.args = (u64)args; err = fastrpc_internal_invoke(fl, true, &ioctl); if (!err) { @@ -2103,7 +2166,7 @@ static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp) ioctl.inv.handle = FASTRPC_INIT_HANDLE; ioctl.inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MMAP, 2, 1); - ioctl.inv.args = (__u64)args; + ioctl.inv.args = (u64)args; err = fastrpc_internal_invoke(fl, true, &ioctl); if (err) { @@ -2184,7 +2247,7 @@ static int fastrpc_req_mem_unmap_impl(struct fastrpc_user *fl, struct fastrpc_me ioctl.inv.handle = FASTRPC_INIT_HANDLE; ioctl.inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MEM_UNMAP, 1, 0); - ioctl.inv.args = (__u64)args; + ioctl.inv.args = (u64)args; err = fastrpc_internal_invoke(fl, true, &ioctl); fastrpc_map_put(map); @@ -2253,7 +2316,7 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) ioctl.inv.handle = FASTRPC_INIT_HANDLE; ioctl.inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MEM_MAP, 3, 1); - ioctl.inv.args = (__u64)args; + ioctl.inv.args = (u64)args; err = fastrpc_internal_invoke(fl, true, &ioctl); if (err) { @@ -2574,6 +2637,10 @@ static void fastrpc_notify_users(struct fastrpc_user *user) ctx->retval = -EPIPE; complete(&ctx->work); } + list_for_each_entry(ctx, &user->interrupted, node) { + ctx->retval = -EPIPE; + complete(&ctx->work); + } spin_unlock(&user->lock); }