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Thu, 11 Dec 2025 00:08:14 -0800 (PST) Received: from [10.213.102.126] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7f4c22848a7sm1706651b3a.3.2025.12.11.00.08.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Dec 2025 00:08:13 -0800 (PST) From: Sivareddy Surasani Date: Thu, 11 Dec 2025 13:37:41 +0530 Subject: [PATCH 09/11] bus: mhi: host: Get total descriptor count Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251211-siva_mhi_dp2-v1-9-d2895c4ec73a@oss.qualcomm.com> References: <20251211-siva_mhi_dp2-v1-0-d2895c4ec73a@oss.qualcomm.com> In-Reply-To: <20251211-siva_mhi_dp2-v1-0-d2895c4ec73a@oss.qualcomm.com> To: Manivannan Sadhasivam , Jonathan Corbet , Arnd Bergmann , Greg Kroah-Hartman Cc: mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Upal Kumar Saha , Himanshu Shukla , Sivareddy Surasani , Vivek Pernamitta X-Mailer: b4 0.15-dev-47773 X-Proofpoint-GUID: 30arnefItncWFhwvJwEBVULMS61C4T3w X-Authority-Analysis: v=2.4 cv=d974CBjE c=1 sm=1 tr=0 ts=693a7bef cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=wP3pNCr1ah4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=kBv2GRQmL64bnbioCYQA:9 a=QEXdDO2ut3YA:10 a=OpyuDcXvxspvyRM73sMx:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjExMDA1OSBTYWx0ZWRfX2brvcrMX/sgN wZ8I4pOW2nrJR8CGIYoUHYS1dc9BRa6bYnAtyBiE36DlJzdWdriXbzxIed3PRVvrr2oVhl5b8Ig 1dDl8j89LEXMUgfbAGqUhveF0x350Kzt1BAGFjtCfaKs+DGupZms9djfOg9L2DBs9mA606aO25D ZfkqvE7cSAAIfN04VUwX38xj2kod6Prj5fsryBWtGaH0fPd0Qr02bl3/eCHrERcwubGWXO3poz+ eiY020PvRGLyLP0q8tNMvthWUyVNQXKb6nt5CjrqqYGpiWbmTNWKJcnPubHokAZcqMB+LWbTb76 8fAhnvGU5FEQHJ8XNjuBBlwTqYdHuE1mxbMaV9Z4TmZEVkZIJ/FbaDIBsZOaWGS1zKz8r0ouqSV TR/H7JzXiS+kJJOsYRoWxNhNPgZIhA== X-Proofpoint-ORIG-GUID: 30arnefItncWFhwvJwEBVULMS61C4T3w 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=2025-12-10_03,2025-12-09_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 impostorscore=0 spamscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2512110059 From: Vivek Pernamitta Introduce a new API to retrieve the length of a transfer ring. This API allows clients to query the ring length. Signed-off-by: Vivek Pernamitta Signed-off-by: Sivareddy Surasani --- drivers/bus/mhi/host/main.c | 11 +++++++++++ include/linux/mhi.h | 9 +++++++++ 2 files changed, 20 insertions(+) diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c index 9772fb13400c..6be15297829d 100644 --- a/drivers/bus/mhi/host/main.c +++ b/drivers/bus/mhi/host/main.c @@ -345,6 +345,17 @@ int mhi_get_free_desc_count(struct mhi_device *mhi_dev, } EXPORT_SYMBOL_GPL(mhi_get_free_desc_count); =20 +int mhi_get_total_descriptors(struct mhi_device *mhi_dev, + enum dma_data_direction dir) +{ + struct mhi_chan *mhi_chan =3D (dir =3D=3D DMA_TO_DEVICE) ? + mhi_dev->ul_chan : mhi_dev->dl_chan; + struct mhi_ring *tre_ring =3D &mhi_chan->tre_ring; + + return tre_ring->elements; +} +EXPORT_SYMBOL(mhi_get_total_descriptors); + void mhi_notify(struct mhi_device *mhi_dev, enum mhi_callback cb_reason) { struct mhi_driver *mhi_drv; diff --git a/include/linux/mhi.h b/include/linux/mhi.h index 66fd83bed306..013bc2d82196 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -620,6 +620,15 @@ void mhi_notify(struct mhi_device *mhi_dev, enum mhi_c= allback cb_reason); int mhi_get_free_desc_count(struct mhi_device *mhi_dev, enum dma_data_direction dir); =20 +/** + * mhi_get_total_descriptors - Get total transfer ring length + * Get # of TD available to queue buffers + * @mhi_dev: Device associated with the channels + * @dir: Direction of the channel + */ +int mhi_get_total_descriptors(struct mhi_device *mhi_dev, + enum dma_data_direction dir); + /** * mhi_prepare_for_power_up - Do pre-initialization before power up. * This is optional, call this before power up = if --=20 2.34.1