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Wed, 12 Nov 2025 22:41:25 -0800 (PST) Received: from hu-ekangupt-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-bc36db25bfbsm1138419a12.1.2025.11.12.22.41.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Nov 2025 22:41:25 -0800 (PST) From: Ekansh Gupta To: srini@kernel.org, linux-arm-msm@vger.kernel.org Cc: gregkh@linuxfoundation.org, quic_bkumar@quicinc.com, linux-kernel@vger.kernel.org, quic_chennak@quicinc.com, dri-devel@lists.freedesktop.org, arnd@arndb.de, dmitry.baryshkov@oss.qualcomm.com Subject: [PATCH v3 3/3] misc: fastrpc: Add polling mode support for fastRPC driver Date: Thu, 13 Nov 2025 12:11:11 +0530 Message-Id: <20251113064111.2426325-4-ekansh.gupta@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251113064111.2426325-1-ekansh.gupta@oss.qualcomm.com> References: <20251113064111.2426325-1-ekansh.gupta@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-ORIG-GUID: Xxl0mzrK9vSmeUA-PHV8cdF4uVdEsTei X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTEzMDA0NCBTYWx0ZWRfX2cWOrlHd+ygq 1+PY6CtOboAh3A06pNaeqv/D2o7AiMd0XUnkd4F6iGzCvMfBDMun9+YtEwJYVOI9tSxueuutMXt 0amuatgKCtGxY4+GbIbHxPvWzPhmKoJB40acHgCR1+AKTB/Q3OxnVKVs/HTrd/14Hf1nrWd5lpk oflhlAMKJfQ90jTC1y8NtVypJ9UZAgdSEzR9XjF1ovSapKE3ErDTaGtmluWPqrPbg+xRiyHxpkp SesGkqWGNZV9LjgcTj+dqQodKqGo5XplK73Y1f5wApPZra0rUuljnYg26vTbDk3mY7ZenqtrEBU zOlUtzR9JcwGBiZurFWCkkCsqd6PfeBAi4I/6/CdOUqN+o4AM26BG9ADnUuPMfW3MToUmnkNWSu D9lu7PJfCJI+MxLSGVo9fVT6Xojgfg== X-Authority-Analysis: v=2.4 cv=F+Bat6hN c=1 sm=1 tr=0 ts=69157d96 cx=c_pps a=Qgeoaf8Lrialg5Z894R3/Q==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=TEHdEMHTk_fMHrPBF0kA:9 a=x9snwWr2DeNwDh03kgHS:22 X-Proofpoint-GUID: Xxl0mzrK9vSmeUA-PHV8cdF4uVdEsTei X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-12_06,2025-11-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 spamscore=0 malwarescore=0 phishscore=0 bulkscore=0 adultscore=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511130044 Content-Type: text/plain; charset="utf-8" For any remote call to DSP, after sending an invocation message, fastRPC driver waits for glink response and during this time the CPU can go into low power modes. This adds latency to overall fastrpc call as CPU wakeup and scheduling latencies are included. Add polling mode support with which fastRPC driver will poll continuously on a memory after sending a message to remote subsystem which will eliminate CPU wakeup and scheduling latencies and reduce fastRPC overhead. Poll mode can be enabled by user by making a remote_handle64_control request. Signed-off-by: Ekansh Gupta --- drivers/misc/fastrpc.c | 138 ++++++++++++++++++++++++++++++++++-- include/uapi/misc/fastrpc.h | 9 +++ 2 files changed, 140 insertions(+), 7 deletions(-) diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index ccba3b6dfdfa..60de9dcb9815 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -22,6 +22,8 @@ #include #include #include +#include +#include =20 #define ADSP_DOMAIN_ID (0) #define MDSP_DOMAIN_ID (1) @@ -37,6 +39,7 @@ #define FASTRPC_CTX_MAX (256) #define FASTRPC_INIT_HANDLE 1 #define FASTRPC_DSP_UTILITIES_HANDLE 2 +#define FASTRPC_MAX_STATIC_HANDLE (20) #define FASTRPC_CTXID_MASK (0xFF00) #define FASTRPC_CTXID_POS (8) #define INIT_FILELEN_MAX (2 * 1024 * 1024) @@ -106,6 +109,12 @@ =20 #define miscdev_to_fdevice(d) container_of(d, struct fastrpc_device, miscd= ev) =20 +/* Poll response number from remote processor for call completion */ +#define FASTRPC_POLL_RESPONSE (0xdecaf) + +/* Polling mode timeout limit */ +#define FASTRPC_POLL_MAX_TIMEOUT_US (10000) + struct fastrpc_phy_page { u64 addr; /* physical address */ u64 size; /* size of contiguous region */ @@ -236,8 +245,14 @@ struct fastrpc_invoke_ctx { u32 sc; u64 *fdlist; u32 *crc; + /* Poll memory that DSP updates */ + u32 *poll; u64 ctxid; u64 msg_sz; + /* work done status flag */ + bool is_work_done; + /* process updates poll memory instead of glink response */ + bool is_polled; struct kref refcount; struct list_head node; /* list of ctxs */ struct completion work; @@ -301,6 +316,8 @@ struct fastrpc_user { int client_id; int pd; bool is_secure_dev; + /* Flags poll mode state */ + bool poll_mode; /* Lock for lists */ spinlock_t lock; /* lock for allocations */ @@ -894,7 +911,8 @@ static int fastrpc_get_meta_size(struct fastrpc_invoke_= ctx *ctx) sizeof(struct fastrpc_invoke_buf) + sizeof(struct fastrpc_phy_page)) * ctx->nscalars + sizeof(u64) * FASTRPC_MAX_FDLIST + - sizeof(u32) * FASTRPC_MAX_CRCLIST; + sizeof(u32) * FASTRPC_MAX_CRCLIST + + sizeof(u32); =20 return size; } @@ -990,6 +1008,7 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc= _invoke_ctx *ctx) list =3D fastrpc_invoke_buf_start(rpra, ctx->nscalars); pages =3D fastrpc_phy_page_start(list, ctx->nscalars); ctx->fdlist =3D (u64 *)(pages + ctx->nscalars); + ctx->poll =3D (u32 *)(ctx->fdlist + FASTRPC_MAX_FDLIST + FASTRPC_MAX_CRCL= IST); args =3D (uintptr_t)ctx->buf->virt + metalen; rlen =3D pkt_size - metalen; ctx->rpra =3D rpra; @@ -1158,6 +1177,75 @@ static int fastrpc_invoke_send(struct fastrpc_sessio= n_ctx *sctx, =20 } =20 +static inline u32 fastrpc_poll_op(void *p) +{ + struct fastrpc_invoke_ctx *ctx =3D p; + + dma_rmb(); + return READ_ONCE(*ctx->poll); +} + +static int poll_for_remote_response(struct fastrpc_invoke_ctx *ctx) +{ + u32 val; + int ret; + + /* + * Poll until DSP writes FASTRPC_POLL_RESPONSE into *ctx->poll + * or until another path marks the work done. + */ + ret =3D read_poll_timeout_atomic(fastrpc_poll_op, val, + (val =3D=3D FASTRPC_POLL_RESPONSE) || + ctx->is_work_done, 1, + FASTRPC_POLL_MAX_TIMEOUT_US, false, ctx); + + if (!ret && val =3D=3D FASTRPC_POLL_RESPONSE) { + ctx->is_work_done =3D true; + ctx->retval =3D 0; + } + + if (ret =3D=3D -ETIMEDOUT) + ret =3D -EIO; + + return ret; +} + +static inline int fastrpc_wait_for_response(struct fastrpc_invoke_ctx *ctx, + u32 kernel) +{ + int err =3D 0; + + if (kernel) { + if (!wait_for_completion_timeout(&ctx->work, 10 * HZ)) + err =3D -ETIMEDOUT; + } else { + err =3D wait_for_completion_interruptible(&ctx->work); + } + + return err; +} + +static int fastrpc_wait_for_completion(struct fastrpc_invoke_ctx *ctx, + u32 kernel) +{ + int err; + + do { + if (ctx->is_polled) { + err =3D poll_for_remote_response(ctx); + /* If polling timed out, move to normal response mode */ + if (err) + ctx->is_polled =3D false; + } else { + err =3D fastrpc_wait_for_response(ctx, kernel); + if (err) + return err; + } + } while (!ctx->is_work_done); + + return err; +} + static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel, u32 handle, u32 sc, struct fastrpc_invoke_args *args) @@ -1193,16 +1281,25 @@ static int fastrpc_internal_invoke(struct fastrpc_u= ser *fl, u32 kernel, if (err) goto bail; =20 - if (kernel) { - if (!wait_for_completion_timeout(&ctx->work, 10 * HZ)) - err =3D -ETIMEDOUT; - } else { - err =3D wait_for_completion_interruptible(&ctx->work); - } + /* + * Set message context as polled if the call is for a user PD + * dynamic module and user has enabled poll mode. + */ + if (handle > FASTRPC_MAX_STATIC_HANDLE && fl->pd =3D=3D USER_PD && + fl->poll_mode) + ctx->is_polled =3D true; + + err =3D fastrpc_wait_for_completion(ctx, kernel); =20 if (err) goto bail; =20 + if (!ctx->is_work_done) { + err =3D -ETIMEDOUT; + dev_dbg(fl->sctx->dev, "Invalid workdone state for handle 0x%x, sc 0x%x\= n", + handle, sc); + goto bail; + } /* make sure that all memory writes by DSP are seen by CPU */ dma_rmb(); /* populate all the output buffers with results */ @@ -1780,6 +1877,29 @@ static int fastrpc_get_info_from_kernel(struct fastr= pc_ioctl_capability *cap, return 0; } =20 +static int fastrpc_set_option(struct fastrpc_user *fl, char __user *argp) +{ + struct fastrpc_ioctl_set_option opt =3D {0}; + int i; + + if (copy_from_user(&opt, argp, sizeof(opt))) + return -EFAULT; + + for (i =3D 0; i < ARRAY_SIZE(opt.reserved); i++) { + if (opt.reserved[i] !=3D 0) + return -EINVAL; + } + if (opt.req !=3D FASTRPC_POLL_MODE) + return -EINVAL; + + if (opt.enable) + fl->poll_mode =3D true; + else + fl->poll_mode =3D false; + + return 0; +} + static int fastrpc_get_dsp_info(struct fastrpc_user *fl, char __user *argp) { struct fastrpc_ioctl_capability cap =3D {0}; @@ -2134,6 +2254,9 @@ static long fastrpc_device_ioctl(struct file *file, u= nsigned int cmd, case FASTRPC_IOCTL_MEM_UNMAP: err =3D fastrpc_req_mem_unmap(fl, argp); break; + case FASTRPC_IOCTL_SET_OPTION: + err =3D fastrpc_set_option(fl, argp); + break; case FASTRPC_IOCTL_GET_DSP_INFO: err =3D fastrpc_get_dsp_info(fl, argp); break; @@ -2465,6 +2588,7 @@ static int fastrpc_rpmsg_callback(struct rpmsg_device= *rpdev, void *data, =20 ctx->retval =3D rsp->retval; complete(&ctx->work); + ctx->is_work_done =3D true; =20 /* * The DMA buffer associated with the context cannot be freed in diff --git a/include/uapi/misc/fastrpc.h b/include/uapi/misc/fastrpc.h index c6e2925f47e6..6c1375ba0042 100644 --- a/include/uapi/misc/fastrpc.h +++ b/include/uapi/misc/fastrpc.h @@ -16,6 +16,7 @@ #define FASTRPC_IOCTL_INIT_CREATE_STATIC _IOWR('R', 9, struct fastrpc_init= _create_static) #define FASTRPC_IOCTL_MEM_MAP _IOWR('R', 10, struct fastrpc_mem_map) #define FASTRPC_IOCTL_MEM_UNMAP _IOWR('R', 11, struct fastrpc_mem_unmap) +#define FASTRPC_IOCTL_SET_OPTION _IOWR('R', 12, struct fastrpc_ioctl_set_o= ption) #define FASTRPC_IOCTL_GET_DSP_INFO _IOWR('R', 13, struct fastrpc_ioctl_cap= ability) =20 /** @@ -66,6 +67,8 @@ enum fastrpc_proc_attr { =20 /* Fastrpc attribute for memory protection of buffers */ #define FASTRPC_ATTR_SECUREMAP (1) +/* Set option request ID to enable poll mode */ +#define FASTRPC_POLL_MODE (1) =20 struct fastrpc_invoke_args { __u64 ptr; @@ -133,6 +136,12 @@ struct fastrpc_mem_unmap { __s32 reserved[5]; }; =20 +struct fastrpc_ioctl_set_option { + __u32 req; /* request id */ + __u32 enable; /* enable flag */ + __s32 reserved[6]; +}; + struct fastrpc_ioctl_capability { __u32 unused; /* deprecated, ignored by the kernel */ __u32 attribute_id; --=20 2.34.1