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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-37520cfe07dsm10131788eec.20.2026.11.10.14.54.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Nov 2026 14:54:43 -0800 (PST) Date: Tue, 10 Nov 2026 14:54:21 -0800 From: Jonathan Cameron To: Cristian Marussi Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, arm-scmi@vger.kernel.org, linux-doc@vger.kernel.org, sudeep.holla@kernel.org, james.quinlan@broadcom.com, f.fainelli@gmail.com, vincent.guittot@linaro.org, etienne.carriere@st.com, peng.fan@oss.nxp.com, michal.simek@amd.com, d-gole@ti.com, elif.topuz@arm.com, lukasz.luba@arm.com, philip.radford@arm.com, david@kernel.org, souvik.chakravarty@arm.com, leitao@kernel.org, kas@kernel.org, puranjay@kernel.org, usama.arif@linux.dev, kernel-team@meta.com Subject: Re: [PATCH v15 25/35] firmware: arm_scmi: Add Telemetry debugfs SHMTI dump support Message-ID: <20261110145421.00002a62@oss.qualcomm.com> In-Reply-To: <20261109091221.2532706-26-cristian.marussi@arm.com> References: <20261109091221.2532706-1-cristian.marussi@arm.com> <20261109091221.2532706-26-cristian.marussi@arm.com> Organization: Qualcomm X-Mailer: Claws Mail 4.4.0 (GTK 3.24.51; x86_64-w64-mingw32) X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTEwMDA5MSBTYWx0ZWRfX0lmsxZ62qlZF rKADlR3obJ9+hca0NM9+UQOQkzAtUBHwAwZjdO6cxJUymEKuBgyviziA/puaw191EVYZu6oW+iS hRSwHOKm63qDweAsJ8YOYJm1dHtNCiXiCzujCORje0nqBK1JTWtJhnfxalwQRuB7U6YbtknzlO0 5vZkHfB1u3uGgQ+/btaMBJ/cq8XDa2C+DJEtg/ZwwDMrmZ3EFlPFJ0gfGkg/DC4lb7kzdVye6NX DMXWCtyj19pqqsoZXEvMErBCayHE7jgzWchL50co6YWlaKLFQmSw2l1GR+jm8qygimVu4loTDg+ 11aQ2Eb2dKV9D025ivirfBuA9NjbuvEPdvJiVLh71DB/fANrTbtdhhTf77P7pLilDdIoSh8SaIF IeMSob3F1DeKU6qaG4+AJlquwfTrhXI5FgCikKJfpbfEgBfiWOJRe9jY+YOH6nkSrlhUkAFl7aW UCNhg5gxF6CHM9fXndw== X-Authority-Analysis: v=2.4 cv=cJl1IVeN c=1 sm=1 tr=0 ts=6af3a0b5 cx=c_pps a=cFYjgdjTJScbgFmBucgdfQ==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=kj9zAlcOel0A:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=7CQSdrXTAAAA:8 a=CKzkSn0JwAB8-U6WE24A:9 a=CjuIK1q_8ugA:10 a=scEy_gLbYbu1JhEsrz4S:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-GUID: FztPVmycTrfv-nQ3WF2ZDeAyWOAw-y3a X-Proofpoint-ORIG-GUID: FztPVmycTrfv-nQ3WF2ZDeAyWOAw-y3a X-Proofpoint-Spam-Info: AW1haW4tMjYxMTEwMDA5MSBTYWx0ZWRfX45tbEBJfL+8a xP5qJrFrOI7YeP+0wazM3jgKYZmN3gDilweGQFx0IS7knj7YpO9H4rnabneHt3+3QH8ask8PaNW G/e4k6gfMXFhHNtCjZ0q5+dhwimsqp0= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-10_07,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 malwarescore=0 phishscore=0 suspectscore=0 priorityscore=1501 spamscore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611100091 On Mon, 9 Nov 2026 09:12:11 +0000 Cristian Marussi wrote: > Expose one debugfs entry for each discovered SHMTI that can be used to > dump the related SHMTI in binary form from TBGN up to TEND markers. > > No processing is done kernel side, beside using proper accessors for > device memory. > > Signed-off-by: Cristian Marussi Seems fine, one trivial inline. I find it hard to care about this particular option though. > --- > drivers/firmware/arm_scmi/telemetry.c | 103 ++++++++++++++++++++++++++ > 1 file changed, 103 insertions(+) > > diff --git a/drivers/firmware/arm_scmi/telemetry.c b/drivers/firmware/arm_scmi/telemetry.c > index c21700bd1b43..7582fe295a23 100644 > --- a/drivers/firmware/arm_scmi/telemetry.c > +++ b/drivers/firmware/arm_scmi/telemetry.c > @@ -1683,6 +1694,91 @@ scmi_telemetry_enumerate_common_intervals(struct telemetry_info *ti) > ti->info.intervals); > } > > +static int scmi_telemetry_dbg_shmti_open(struct inode *inode, struct file *filp) > +{ > + struct scmi_telemetry_dbg_shmti *sblob; > + struct telemetry_shmti *shmti; > + > + if (!inode->i_private) > + return -ENODEV; > + > + shmti = inode->i_private; > + sblob = kzalloc_obj(*sblob); Use some __free magic then appropriate no_free_ptr() after it can't fail any more. Trivial but might as well. > + if (!sblob) > + return -ENOMEM; > + > + sblob->shmti = shmti; > + sblob->buf = kvzalloc(shmti->info.len, GFP_KERNEL); > + if (!sblob->buf) { > + kfree(sblob); > + return -ENOMEM; > + } > + > + mutex_init(&sblob->mtx); > + > + filp->private_data = sblob; > + > + return 0; > +} >