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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3751fe32276sm2466798eec.8.2026.11.09.18.26.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Nov 2026 18:26:58 -0800 (PST) Date: Mon, 9 Nov 2026 18:26:54 -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 13/35] firmware: arm_scmi: Add Telemetry SHMTI areas enumeration Message-ID: <20261109182654.00003f6d@oss.qualcomm.com> In-Reply-To: <20261109091221.2532706-14-cristian.marussi@arm.com> References: <20261109091221.2532706-1-cristian.marussi@arm.com> <20261109091221.2532706-14-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: AW1haW4tMjYxMTEwMDAwOSBTYWx0ZWRfX5yQyZDSkG8ME tQY/aS6re03OQPqHX7Pz1jjJ36I6NjRjOFVpE5w8FeSdRKtXUhp9ks7ZGz0Dkuwb/OtCjAn5MEg WQZiS9AsinbPxVopTbUNni9PD/5ogafrp8QeQqcf0PuUOp4RoP32Q+dxSIKU55NJj7xRNPN6Hk9 VzGk2zuBvEFKfz+9v2MxPFH8vAtx2N6F0cNm2YaM40C30jApnzDMyI7hK44PtTz4cyq1gcKCb7y BNvFJJEM7bacnzqXtnTxbyo9sXjRTxs+3DWjLHofQZxcLjhOzAqkaHtLB/wmcwgADd+pHiU5Uzu qrg4wmcgT60lNhiB09IfKjeHdF+wg6nEAKwkt5qp9o0kGyqbHfx3ztdh7vOSYI+rudBtTNtgpbK HJq/sdshYDqnaKcDVL3oalAVI6a0Aw0pX3kqHHr7oLzfNZOn/qbos6LF05IC0xXdd5ZHwFo2ltA JT33VpeW/WkwV+V6fFA== X-Proofpoint-Spam-Info: AW1haW4tMjYxMTEwMDAwOSBTYWx0ZWRfX1hpjknhd040E YHbVi77R7j+/yZKde4b0MYH9Obliban5ZJAxwpT0ZF+tNacOspXZiLskNTmp1PYwixkro8LcT2F NP/ZzrHeor2ylh53WyhZx0XzHFjSGKM= X-Proofpoint-GUID: B9woq8tT0aQxRIJEAgjcyCOEVSu-hA6S X-Authority-Analysis: v=2.4 cv=B6gsQ+tM c=1 sm=1 tr=0 ts=6af280f4 cx=c_pps a=Uww141gWH0fZj/3QKPojxA==: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=UCLCd_48klQTlnfJctoA:9 a=CjuIK1q_8ugA:10 a=PxkB5W3o20Ba91AHUih5:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-ORIG-GUID: B9woq8tT0aQxRIJEAgjcyCOEVSu-hA6S 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_01,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 lowpriorityscore=0 adultscore=0 suspectscore=0 priorityscore=1501 impostorscore=0 bulkscore=0 spamscore=0 malwarescore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611100009 On Mon, 9 Nov 2026 09:11:59 +0000 Cristian Marussi wrote: > Add Telemetry support to enumerate SHMTI areas. I'd be tempted to leave the local data structures like snaps to be introduced only when code actually uses them. > > Signed-off-by: Cristian Marussi > --- > v14 --> v15 > - fix prologue/epilogue endianity fields > - rework SHMTI initialization and allocation > - add snapshot suppport data structures > - added alignment checks on SHMTII length size > - fixed error string formatting > - warn if less than expected SHMTIs are enumerated > - improve memory area sanity checks > v13 --> v14 > - splitted out of the old Basic Telemetry patch, contains the > SHMTI areas enumeration routines > --- > drivers/firmware/arm_scmi/telemetry.c | 312 ++++++++++++++++++++++++++ > include/linux/scmi_protocol.h | 59 +++++ > 2 files changed, 371 insertions(+) > > diff --git a/drivers/firmware/arm_scmi/telemetry.c b/drivers/firmware/arm_scmi/telemetry.c > index e57534c93b26..d9f1a3e3468e 100644 > --- a/drivers/firmware/arm_scmi/telemetry.c > +++ b/drivers/firmware/arm_scmi/telemetry.c > @@ -16,6 +16,7 @@ > #include > #include > #include > +#include > #include > #include > #include > +struct scmi_msg_resp_telemetry_shmti_list { > + __le32 num_shmti; Add a comment that this is not actually the number of shmti. Not confusing spec name at all. Maybe just put a pair of extraction macros right after it like you've had for some of the other similar cases and that will act as documentation that not all is what it seems. > + struct scmi_shmti_desc desc[]; > +}; > + > struct de_desc_fastchannel { > __le32 addr_low; > __le32 addr_high; > @@ -107,6 +121,72 @@ struct scmi_msg_resp_telemetry_update_intervals { > __le32 intervals[]; > }; > > +/* TDCF */ > + > +#define _I(__a) (ioread32((void __iomem *)(__a))) Is that really worth doing? I think I'd rather see some long lines with that expanded out. > + > +struct prlg { > + __le32 sign_start; > +#define SIGNATURE_START 0x5442474E /* TBGN */ > + __le32 match_start; > + __le32 num_qwords; > + __le32 hdr_meta_1; > +#define TDCF_REVISION_GET(x) (le32_get_bits((x)->hdr_meta_1, GENMASK(7, 0))) Outer brackets needed? > +}; > + > +struct eplg { > + __le32 match_end; > + __le32 sign_end; > +#define SIGNATURE_END 0x54454E44 /* TEND */ > +}; > + > +#define TDCF_EPLG_SZ (sizeof(struct eplg)) > + > +struct tdcf { > + struct prlg prlg; > + unsigned char payld[]; > +}; > + > +#define SHMTI_MIN_SIZE (sizeof(struct tdcf) + TDCF_EPLG_SZ) > +/* An arbitrary upper bound to avoid crazy allocations driven by buggy FW */ > +#define SHMTI_MAX_SIZE SZ_64K > + > +#define TDCF_START_SIGNATURE(x) (_I(&((x)->prlg.sign_start))) > +#define TDCF_END_SIGNATURE(e) (_I(&((e)->sign_end))) > /* Mutex to protect access to @free_des */ > @@ -878,6 +960,211 @@ scmi_telemetry_enumerate_common_intervals(struct telemetry_info *ti) > ti->info.intervals); > } > > +static int iter_shmti_update_state(struct scmi_iterator_state *st, > + const void *response, void *priv) > +{ > + const struct scmi_msg_resp_telemetry_shmti_list *r = response; > + > + st->num_returned = le32_get_bits(r->num_shmti, GENMASK(15, 0)); > + st->num_remaining = le32_get_bits(r->num_shmti, GENMASK(31, 16)); I'd move those two into defines above, just to document that num_shmti is more complex than it seems at first glance. Also for general consistency. > + > + if (st->rx_len < (sizeof(*r) + sizeof(r->desc[0]) * st->num_returned)) > + return -EINVAL; > + > + return 0; > +} > + > +static int iter_shmti_process_response(const struct scmi_protocol_handle *ph, > + const void *response, > + struct scmi_iterator_state *st, > + void *priv) > +{ > + const struct scmi_msg_resp_telemetry_shmti_list *r = response; > + struct telemetry_info *ti = priv; > + struct telemetry_shmti *shmti; > + const struct scmi_shmti_desc *desc; > + void __iomem *addr; > + phys_addr_t phys_addr; > + size_t len; > + int ret; > + > + desc = &r->desc[st->loop_idx]; > + shmti = &ti->shmti[st->desc_index + st->loop_idx]; > + > + shmti->info.sid = le32_to_cpu(desc->id); > + shmti->flags = le32_to_cpu(desc->flags); > + > + ret = scmi_telemetry_area_check(ph->dev, "SHMTI", > + le32_to_cpu(desc->addr_low), > + le32_to_cpu(desc->addr_high), Same as before. I'd do the build of phys_addr and len outside the call. Keep it to checking validity as it's name suggests. > + le32_to_cpu(desc->length), > + &phys_addr, &len); > + if (ret) { > + dev_err(ph->dev, "Malformed SHMTI ID:%u. Abort.\n", > + shmti->info.sid); > + return ret; > + } > + > + if (len < SHMTI_MIN_SIZE || len > SHMTI_MAX_SIZE) { > + dev_err(ph->dev, > + FW_BUG "Invalid length for SHMTI ID:%u len:%zu. Abort.\n", > + shmti->info.sid, len); > + return -EINVAL; > + } > + > + /* SHMTI base phys_addr SHOULD be 64bit aligned by the SCMI spec */ > + if (!IS_ALIGNED(phys_addr, 8)) > + dev_warn(ph->dev, > + "SHMTI ID:%u is NOT 64bit aligned (paddr:0x%llX)\n", > + shmti->info.sid, phys_addr); > + > + addr = devm_ioremap(ph->dev, phys_addr, len); > + if (!addr) > + return -EADDRNOTAVAIL; > + > + shmti->base = addr; > + shmti->info.len = len; > + shmti->info.phys = phys_addr; > + shmti->info.offset = shmti->info.phys & ~PAGE_MASK; > + > + ret = scmi_telemetry_shmti_validate(ph->dev, shmti); > + if (ret) > + return ret; > + > + ti->num_shmti++; > + > + return 0; > +} > diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h > index f38ca2f8099b..b7b8bd77b37d 100644 > --- a/include/linux/scmi_protocol.h > +++ b/include/linux/scmi_protocol.h > @@ -830,6 +830,57 @@ struct scmi_pinctrl_proto_ops { > int (*pin_free)(const struct scmi_protocol_handle *ph, u32 pin); > }; > > + > +enum scmi_telemetry_compo_type { > + SCMI_TLM_COMPO_TYPE_USPECIFIED, > + SCMI_TLM_COMPO_TYPE_CPU, > + SCMI_TLM_COMPO_TYPE_CLUSTER, > + SCMI_TLM_COMPO_TYPE_GPU, > + SCMI_TLM_COMPO_TYPE_NPU, > + SCMI_TLM_COMPO_TYPE_INTERCONNECT, > + SCMI_TLM_COMPO_TYPE_MEM_CNTRL, > + SCMI_TLM_COMPO_TYPE_L1_CACHE, > + SCMI_TLM_COMPO_TYPE_L2_CACHE, > + SCMI_TLM_COMPO_TYPE_L3_CACHE, > + SCMI_TLM_COMPO_TYPE_LL_CACHE, > + SCMI_TLM_COMPO_TYPE_SYS_CACHE, > + SCMI_TLM_COMPO_TYPE_DISP_CNTRL, > + SCMI_TLM_COMPO_TYPE_IPU, > + SCMI_TLM_COMPO_TYPE_CHIPLET, > + SCMI_TLM_COMPO_TYPE_PACKAGE, > + SCMI_TLM_COMPO_TYPE_SOC, > + SCMI_TLM_COMPO_TYPE_SYSTEM, > + SCMI_TLM_COMPO_TYPE_SMCU, > + SCMI_TLM_COMPO_TYPE_ACCEL, > + SCMI_TLM_COMPO_TYPE_BATTERY, > + SCMI_TLM_COMPO_TYPE_CHARGER, > + SCMI_TLM_COMPO_TYPE_PMIC, > + SCMI_TLM_COMPO_TYPE_BOARD, > + SCMI_TLM_COMPO_TYPE_MEMORY, > + SCMI_TLM_COMPO_TYPE_PERIPH, > + SCMI_TLM_COMPO_TYPE_PERIPH_SUBC, > + SCMI_TLM_COMPO_TYPE_LID, > + SCMI_TLM_COMPO_TYPE_DISPLAY, Die 0x1d is in the version I'm looking at. Perhaps a comment for specific version of spec used. I'd also be tempted to assign every one of these as it makes it easy to eyeball an particular one vs the spec. > + SCMI_TLM_COMPO_TYPE_RESERVED_START = 0x1d, > + SCMI_TLM_COMPO_TYPE_RESERVED_END = 0xdf, > + SCMI_TLM_COMPO_TYPE_OEM_START = 0xe0, > + SCMI_TLM_COMPO_TYPE_OEM_END = 0xff, > +};