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Tue, 14 Jul 2026 09:08:32 -0700 (PDT) X-Received: by 2002:a17:902:e751:b0:2cc:307c:51f2 with SMTP id d9443c01a7336-2cef143aec1mr32214845ad.22.1784045311650; Tue, 14 Jul 2026 09:08:31 -0700 (PDT) Received: from [192.168.0.116] ([124.123.151.85]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ccc9d3d952sm117896085ad.61.2026.07.14.09.08.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Jul 2026 09:08:31 -0700 (PDT) Message-ID: <958a79a9-dbfe-4ba7-9c81-31ed6ffe22be@oss.qualcomm.com> Date: Tue, 14 Jul 2026 21:38:23 +0530 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] net: wwan: qcom_bam_dmux: Alloc RX buffers as a single coherent block To: "Jagielski, Jedrzej" , Stephan Gerhold , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Loic Poulain , Sergey Ryazanov , Johannes Berg Cc: "linux-arm-msm@vger.kernel.org" , "netdev@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "chris.lew@oss.qualcomm.com" , Deepak Kumar Singh References: <20260714-qcom-bam-dmux-vmid-ext-v1-0-3f29da7cca76@oss.qualcomm.com> Content-Language: en-US From: Vishnu Santhosh In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE0MDE2NyBTYWx0ZWRfXwkmmXH2MZAIt ByqgbmnJJPrMD+MPapk6s2TxyHcMOOZzvtC09SbCS+5PeHJKNdBMghYYp45DBl3Oe1E4hdj+8j9 AVuJeJx6j273iqpGtiL2EaxBU6he9OwDel4GWGDKSi97vXSkCxlkN1AD2Ok0RaQQmplfLl7Z8x+ rAFFE6WbHfoa0MdfcCpDVUIL8aOj6Nk4c2P7Ry78TXjtPNrkxZe9zSqDRjV83vONSPbQ9THrsg9 OprhFTdu/IUAqoL5q025vEW5bfn0Eb7pIHoA1fYxVZ9fhUifO2NNmvVTPWimC41aIAEEDRHA8Iu dow/0cgCqgc1eKY+sxT2K105yC7zRLcP5IRwFjjbGIOGKVOeWb87NAUkfcbXv6x0t9EgJPLtPU7 sOvbxHWMg+KqbCUGGUq5h2pJwFAMjklCFvYBEncVbj7y8YrmX5gnj39KBmeVDz/NmY5Qkv7kwrI uDSdD0p+yO5ZCekLRnQ== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE0MDE2NyBTYWx0ZWRfX6oATWav4yOOk 0FdhtFdXP1h+OzWzymfedvxpT+1hjJz087SM+sXDCCrK8GnJ4WK8Oh2gczACoRQYaVZsVIbKlKc uti7Tyr05yUzF92kCKSW6XUWkFW7fg8= X-Authority-Analysis: v=2.4 cv=U+Oiy+ru c=1 sm=1 tr=0 ts=6a565f01 cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=ziBI+Y3eO/H+UwYWWny9Hg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=3bpTIPm_6syKtP_1LDsA:9 a=QEXdDO2ut3YA:10 a=uG9DUKGECoFWVXl0Dc02:22 X-Proofpoint-GUID: whqRgh5xWrqNjdTNr3X7H9FL16i2jHQQ X-Proofpoint-ORIG-GUID: whqRgh5xWrqNjdTNr3X7H9FL16i2jHQQ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-14_04,2026-07-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 malwarescore=0 bulkscore=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 impostorscore=0 adultscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607140167 On 14-07-2026 01:23 pm, Jagielski, Jedrzej wrote: > From: Vishnu Santhosh > Sent: Tuesday, July 14, 2026 7:33 AM > >> On platforms where the modem DMAs into the BAM-DMUX RX data buffers and >> the XPU (eXternal Protection Unit) enforces per-region access control, >> each individually DMA-mapped RX buffer consumes an XPU resource group. >> With only ~16 groups available on Shikra (mDSP, VMID 43 / NAV), the >> per-buffer mappings exhaust the table and inbound transfers fault. >> >> This series adds a qcom,shikra-bam-dmux compatible and have the driver >> select QCOM_SCM_VMID_NAV internally via that compatible's match data. >> When matched, the driver allocates all RX buffers as a single >> contiguous coherent block and SCM-assigns it to HLOS plus the VMID >> once at probe, consuming one XPU resource group instead of many. >> >> Platforms that do not use the qcom,shikra-bam-dmux compatible are >> unaffected: the existing per-buffer dma_map_single() path is >> unchanged. >> >> Signed-off-by: Vishnu Santhosh >> --- >> Vishnu Santhosh (2): >> dt-bindings: net: qcom,bam-dmux: Add qcom,shikra-bam-dmux compatible >> net: wwan: qcom_bam_dmux: Alloc RX buffers as a single coherent block >> >> .../devicetree/bindings/net/qcom,bam-dmux.yaml | 8 +- >> drivers/net/wwan/Kconfig | 1 + >> drivers/net/wwan/qcom_bam_dmux.c | 134 +++++++++++++++++++-- >> 3 files changed, 132 insertions(+), 11 deletions(-) >> --- >> base-commit: 3b029c035b34bbc693405ddf759f0e9b920c27f1 >> change-id: 20260714-qcom-bam-dmux-vmid-ext-d9289db310c1 >> >> Best regards, >> -- >> Vishnu Santhosh > Hi Vishnu > you need to specify target tree, net-next for this series i believe > please refer to[1] > > [1] > https://docs.kernel.org/process/maintainer-netdev.html#indicating-target-tree > Thanks Jedrzej. I will address the comments and will send out the next revision specifying the target tree as net-next. Thanks, Vishnu