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Mon, 03 Nov 2025 21:39:19 -0800 (PST) Received: from hu-sumk-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7acd3150f0asm1462402b3a.2.2025.11.03.21.39.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Nov 2025 21:39:19 -0800 (PST) From: Sumit Kumar Date: Tue, 04 Nov 2025 11:09:06 +0530 Subject: [PATCH v2 2/3] bus: mhi: ep: Create mhi_ep_queue_buf API for raw buffer queuing Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251104-loopback_mhi-v2-2-727a3fd9aa74@oss.qualcomm.com> References: <20251104-loopback_mhi-v2-0-727a3fd9aa74@oss.qualcomm.com> In-Reply-To: <20251104-loopback_mhi-v2-0-727a3fd9aa74@oss.qualcomm.com> To: Manivannan Sadhasivam Cc: Krishna Chaitanya Chundru , Akhil Vinod , Subramanian Ananthanarayanan , linux-kernel@vger.kernel.org, mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, quic_vpernami@quicinc.com, Sumit Kumar X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; 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Extract core logic for queuing buffers into a new internal mhi_ep_queue() function that provides a unified implementation for both mhi_ep_queue_skb() and mhi_ep_queue_buf(). This internal function uses a cb_buf parameter to handle both socket buffers and raw buffers through the same code path. --- drivers/bus/mhi/ep/main.c | 23 +++++++++++++++++------ include/linux/mhi_ep.h | 10 ++++++++++ 2 files changed, 27 insertions(+), 6 deletions(-) diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c index b3eafcf2a2c50d95e3efd3afb27038ecf55552a5..f4b119a8dca2dbfb3ffc24b04c85743fb57088fd 100644 --- a/drivers/bus/mhi/ep/main.c +++ b/drivers/bus/mhi/ep/main.c @@ -544,9 +544,9 @@ static void mhi_ep_skb_completion(struct mhi_ep_buf_info *buf_info) mhi_ep_ring_inc_index(ring); } - /* TODO: Handle partially formed TDs */ -int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb) +static int mhi_ep_queue(struct mhi_ep_device *mhi_dev, void *buf, size_t len, + void *cb_buf) { struct mhi_ep_cntrl *mhi_cntrl = mhi_dev->mhi_cntrl; struct mhi_ep_chan *mhi_chan = mhi_dev->dl_chan; @@ -559,7 +559,7 @@ int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb) u32 tre_len; int ret; - buf_left = skb->len; + buf_left = len; ring = &mhi_cntrl->mhi_chan[mhi_chan->chan].ring; mutex_lock(&mhi_chan->lock); @@ -582,13 +582,13 @@ int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb) tre_len = MHI_TRE_DATA_GET_LEN(el); tr_len = min(buf_left, tre_len); - read_offset = skb->len - buf_left; + read_offset = len - buf_left; - buf_info.dev_addr = skb->data + read_offset; + buf_info.dev_addr = buf + read_offset; buf_info.host_addr = MHI_TRE_DATA_GET_PTR(el); buf_info.size = tr_len; buf_info.cb = mhi_ep_skb_completion; - buf_info.cb_buf = skb; + buf_info.cb_buf = cb_buf; buf_info.mhi_dev = mhi_dev; /* @@ -627,8 +627,19 @@ int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb) return ret; } + +int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb) +{ + return mhi_ep_queue(mhi_dev, skb->data, skb->len, skb); +} EXPORT_SYMBOL_GPL(mhi_ep_queue_skb); +int mhi_ep_queue_buf(struct mhi_ep_device *mhi_dev, void *buf, size_t len) +{ + return mhi_ep_queue(mhi_dev, buf, len, buf); +} +EXPORT_SYMBOL_GPL(mhi_ep_queue_buf); + static int mhi_ep_cache_host_cfg(struct mhi_ep_cntrl *mhi_cntrl) { size_t cmd_ctx_host_size, ch_ctx_host_size, ev_ctx_host_size; diff --git a/include/linux/mhi_ep.h b/include/linux/mhi_ep.h index 7b40fc8cbe77ab8419d167e89264b69a817b9fb1..7186eb667b081009927af48513519084fb0be3a6 100644 --- a/include/linux/mhi_ep.h +++ b/include/linux/mhi_ep.h @@ -302,4 +302,14 @@ bool mhi_ep_queue_is_empty(struct mhi_ep_device *mhi_dev, enum dma_data_directio */ int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb); +/** + * mhi_ep_queue_buf - Send buffer to host over MHI Endpoint + * @mhi_dev: Device associated with the DL channel + * @buf: Buffer to be queued + * @len: Size of the buffer + * + * Return: 0 if the buffer has been sent successfully, a negative error code otherwise. + */ +int mhi_ep_queue_buf(struct mhi_ep_device *mhi_dev, void *buf, size_t len); + #endif -- 2.34.1