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Thu, 09 Apr 2026 00:54:53 -0700 (PDT) X-Received: by 2002:a05:6a00:414b:b0:829:b55e:1b27 with SMTP id d2e1a72fcca58-82d0dbcfa64mr24256973b3a.53.1775721292801; Thu, 09 Apr 2026 00:54:52 -0700 (PDT) Received: from [10.204.79.79] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82cf9ca1f28sm24147067b3a.57.2026.04.09.00.54.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Apr 2026 00:54:52 -0700 (PDT) Message-ID: <2de300c8-02fc-4373-b56d-f6fa336bb84a@oss.qualcomm.com> Date: Thu, 9 Apr 2026 13:24:39 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/4] misc: fastrpc: Allocate entire reserved memory for Audio PD in probe To: Jianping Li , Srinivas Kandagatla , Amol Maheshwari Cc: Arnd Bergmann , Greg Kroah-Hartman , Abel Vesa , Jorge Ramirez-Ortiz , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, quic_chennak@quicinc.com References: <20260409062617.1182-1-jianping.li@oss.qualcomm.com> <20260409062617.1182-4-jianping.li@oss.qualcomm.com> Content-Language: en-US From: Ekansh Gupta In-Reply-To: <20260409062617.1182-4-jianping.li@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=cfPiaHDM c=1 sm=1 tr=0 ts=69d75b4e cx=c_pps a=rz3CxIlbcmazkYymdCej/Q==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=EUspDBNiAAAA:8 a=5ITuIF2ajUGMKyiTjJ0A:9 a=QEXdDO2ut3YA:10 a=bFCP_H2QrGi7Okbo017w:22 X-Proofpoint-ORIG-GUID: rMlbLNYI4fMgcZcA2sXRqDI5Kcfwxcrl X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA5MDA2OCBTYWx0ZWRfX0s2JtHjkb5mv Ed77s6bD9Etrzj+am1HAUCokc9cfoSbz4hJFbK8akjhNNPeAqGAay5NBs9NWjPhAAeBX0Sj4wAc NHIolP6zb/teXF0GV8GGiBxxd+ak74jRzxnCZw2M1aRSfgsCx/2TBEdBhSF1x7TF6eTGqT04x4a 84TdxmPXpRuJSrdpo0Oje4jmikgJrI+bcPb2kSRVeB69vU7K4P4ExlhyQA5K5MwO5dcVI0AoxNc Q/jWdCjacg5J+IGN1PmIfAtgvPff97Te9QmerOG27DQXdEkqOFRWiZ3swS1DMSzKnmnV+rJMyZl 9DEEuYp+BGfI5nk4nSDfe2mYzOrnurhQTXuGWR3Y3xYG4nKpVS4cHIwAWhM38nL1LcBxUhAowdt SyYCMWCm7qx2g3mjeKLDcrTmd1vC+A/t01OASMlvWFbUW7SJXyappjYS5NsjNvW65zQZv8OlN+0 6Hd29RZn4sL9WxroVfQ== X-Proofpoint-GUID: rMlbLNYI4fMgcZcA2sXRqDI5Kcfwxcrl X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-09_02,2026-04-08_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 clxscore=1015 lowpriorityscore=0 malwarescore=0 spamscore=0 bulkscore=0 adultscore=0 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604090068 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On 09-04-2026 11:56, Jianping Li wrote: > Allocating and freeing Audio PD memory from userspace is unsafe because > the kernel cannot reliably determine when the DSP has finished using the > memory. Userspace may free buffers while they are still in use by the DSP, > and remote free requests cannot be safely trusted. > > Allocate the entire Audio PD reserved-memory region upfront during rpmsg > probe and tie its lifetime to the rpmsg channel. This avoids userspace- > controlled alloc/free and ensures memory is reclaimed only when the DSP > shuts down. > > Signed-off-by: Jianping Li > --- > drivers/misc/fastrpc.c | 104 +++++++++++++++++++++-------------------- > 1 file changed, 53 insertions(+), 51 deletions(-) > > diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c > index 148085c3b61a..a67ae991c0b0 100644 > --- a/drivers/misc/fastrpc.c > +++ b/drivers/misc/fastrpc.c > @@ -276,6 +276,8 @@ struct fastrpc_channel_ctx { > struct kref refcount; > /* Flag if dsp attributes are cached */ > bool valid_attributes; > + /* Flag if audio PD init mem was allocated */ > + bool audio_init_mem; > u32 dsp_attributes[FASTRPC_MAX_DSP_ATTRIBUTES]; > struct fastrpc_device *secure_fdevice; > struct fastrpc_device *fdevice; > @@ -1295,15 +1297,16 @@ static int fastrpc_init_create_static_process(struct fastrpc_user *fl, > struct fastrpc_init_create_static init; > struct fastrpc_invoke_args *args; > struct fastrpc_phy_page pages[1]; > + struct fastrpc_channel_ctx *cctx = fl->cctx; > char *name; > int err; > - bool scm_done = false; > struct { > int client_id; > u32 namelen; > u32 pageslen; > } inbuf; > u32 sc; > + unsigned long flags; > > args = kzalloc_objs(*args, FASTRPC_CREATE_STATIC_PROCESS_NARGS); > if (!args) > @@ -1327,31 +1330,6 @@ static int fastrpc_init_create_static_process(struct fastrpc_user *fl, > inbuf.client_id = fl->client_id; > inbuf.namelen = init.namelen; > inbuf.pageslen = 0; > - if (!fl->cctx->remote_heap) { > - err = fastrpc_remote_heap_alloc(fl, fl->sctx->dev, init.memlen, > - &fl->cctx->remote_heap); > - if (err) > - goto err_name; > - > - /* Map if we have any heap VMIDs associated with this ADSP Static Process. */ > - if (fl->cctx->vmcount) { > - u64 src_perms = BIT(QCOM_SCM_VMID_HLOS); > - > - err = qcom_scm_assign_mem(fl->cctx->remote_heap->dma_addr, > - (u64)fl->cctx->remote_heap->size, > - &src_perms, > - fl->cctx->vmperms, fl->cctx->vmcount); > - if (err) { > - dev_err(fl->sctx->dev, > - "Failed to assign memory with dma_addr %pad size 0x%llx err %d\n", > - &fl->cctx->remote_heap->dma_addr, > - fl->cctx->remote_heap->size, err); > - goto err_map; > - } > - scm_done = true; > - inbuf.pageslen = 1; > - } > - } > > fl->pd = USER_PD; > > @@ -1363,8 +1341,25 @@ static int fastrpc_init_create_static_process(struct fastrpc_user *fl, > args[1].length = inbuf.namelen; > args[1].fd = -1; > > - pages[0].addr = fl->cctx->remote_heap->dma_addr; > - pages[0].size = fl->cctx->remote_heap->size; > + spin_lock_irqsave(&cctx->lock, flags); > + if (!fl->cctx->audio_init_mem) { > + if (!fl->cctx->remote_heap || > + !fl->cctx->remote_heap->dma_addr || > + !fl->cctx->remote_heap->size) { > + spin_unlock_irqrestore(&cctx->lock, flags); > + err = -ENOMEM; > + goto err; > + } > + > + pages[0].addr = fl->cctx->remote_heap->dma_addr; > + pages[0].size = fl->cctx->remote_heap->size; > + fl->cctx->audio_init_mem = true; > + inbuf.pageslen = 1; > + } else { > + pages[0].addr = 0; > + pages[0].size = 0; > + } > + spin_unlock_irqrestore(&cctx->lock, flags); > > args[2].ptr = (u64)(uintptr_t) pages; > args[2].length = sizeof(*pages); > @@ -1382,26 +1377,7 @@ static int fastrpc_init_create_static_process(struct fastrpc_user *fl, > > return 0; > err_invoke: > - if (fl->cctx->vmcount && scm_done) { > - u64 src_perms = 0; > - struct qcom_scm_vmperm dst_perms; > - u32 i; > - > - for (i = 0; i < fl->cctx->vmcount; i++) > - src_perms |= BIT(fl->cctx->vmperms[i].vmid); > - > - dst_perms.vmid = QCOM_SCM_VMID_HLOS; > - dst_perms.perm = QCOM_SCM_PERM_RWX; > - err = qcom_scm_assign_mem(fl->cctx->remote_heap->dma_addr, > - (u64)fl->cctx->remote_heap->size, > - &src_perms, &dst_perms, 1); > - if (err) > - dev_err(fl->sctx->dev, "Failed to assign memory dma_addr %pad size 0x%llx err %d\n", > - &fl->cctx->remote_heap->dma_addr, fl->cctx->remote_heap->size, err); > - } > -err_map: > - fastrpc_buf_free(fl->cctx->remote_heap); > -err_name: > + fl->cctx->audio_init_mem = false; > kfree(name); > err: > kfree(args); > @@ -2390,7 +2366,7 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev) > } > } > > - if (domain_id == SDSP_DOMAIN_ID) { > + if (domain_id == SDSP_DOMAIN_ID || domain_id == ADSP_DOMAIN_ID) { > struct resource res; > u64 src_perms; > > @@ -2402,6 +2378,15 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev) > data->vmperms, data->vmcount); > } > > + if (domain_id == ADSP_DOMAIN_ID) { > + data->remote_heap = > + kzalloc_obj(*data->remote_heap, GFP_KERNEL); > + if (!data->remote_heap) > + return -ENOMEM; > + > + data->remote_heap->dma_addr = res.start; > + data->remote_heap->size = resource_size(&res); > + } > } > > secure_dsp = !(of_property_read_bool(rdev->of_node, "qcom,non-secure-domain")); > @@ -2482,6 +2467,7 @@ static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev) > struct fastrpc_buf *buf, *b; > struct fastrpc_user *user; > unsigned long flags; > + int err; > > /* No invocations past this point */ > spin_lock_irqsave(&cctx->lock, flags); > @@ -2499,8 +2485,24 @@ static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev) > list_for_each_entry_safe(buf, b, &cctx->invoke_interrupted_mmaps, node) > list_del(&buf->node); > > - if (cctx->remote_heap) > - fastrpc_buf_free(cctx->remote_heap); > + if (cctx->remote_heap && cctx->vmcount) { > + if (cctx->vmcount) { this if check is not needed > + u64 src_perms = 0; > + struct qcom_scm_vmperm dst_perms; > + > + for (u32 i = 0; i < cctx->vmcount; i++) > + src_perms |= BIT(cctx->vmperms[i].vmid); > + > + dst_perms.vmid = QCOM_SCM_VMID_HLOS; > + dst_perms.perm = QCOM_SCM_PERM_RWX; > + > + err = qcom_scm_assign_mem(cctx->remote_heap->dma_addr, > + cctx->remote_heap->size, > + &src_perms, &dst_perms, 1); > + if (!err) > + fastrpc_buf_free(cctx->remote_heap); > + } > + } > > of_platform_depopulate(&rpdev->dev); >