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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1903bb7f098sm5472c88.12.2026.10.20.10.17.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Oct 2026 10:17:36 -0700 (PDT) Date: Tue, 20 Oct 2026 10:17:20 -0700 From: Jonathan Cameron To: Pierre Gondois Cc: linux-kernel@vger.kernel.org, James Morse , Mark Brown , "Rafael J. Wysocki" , Len Brown , Tony Luck , Borislav Petkov , Hanjun Guo , Mauro Carvalho Chehab , Shuai Xue , Maciej Wieczor-Retman , Pawel Chmielewski , Dave Jiang , "Fabio M. De Francesco" , Breno Leitao , Terry Bowman , Dan Williams , Ard Biesheuvel , Morduan Zang , linux-acpi@vger.kernel.org, linux-edac@vger.kernel.org, acpica-devel@lists.linux.dev Subject: Re: [PATCH v2 5/6] ACPI: APEI: add separate Memory Error Section 2 handlers Message-ID: <20261020101720.00002545@oss.qualcomm.com> In-Reply-To: <20261019203915.2019037-6-pierre.gondois@arm.com> References: <20261019203915.2019037-1-pierre.gondois@arm.com> <20261019203915.2019037-6-pierre.gondois@arm.com> Organization: Qualcomm X-Mailer: Claws Mail 4.4.0 (GTK 3.24.51; x86_64-w64-mingw32) X-Mailing-List: linux-edac@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-GUID: NMhjhAJbsecR6FLgFIvSFT6IgqeXDNtz X-Proofpoint-ORIG-GUID: NMhjhAJbsecR6FLgFIvSFT6IgqeXDNtz X-Authority-Analysis: v=2.4 cv=L7qI0OT8 c=1 sm=1 tr=0 ts=6ad7a233 cx=c_pps a=wEP8DlPgTf/vqF+yE6f9lg==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=kj9zAlcOel0A:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=7CQSdrXTAAAA:8 a=EUspDBNiAAAA:8 a=Rvnai5sDmRKbKYGs1KsA:9 a=CjuIK1q_8ugA:10 a=bBxd6f-gb0O0v-kibOvt:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIwMDA2OCBTYWx0ZWRfX1CUds6WFBaZW SWgm2bKQx9F0LDuQfC3O96Gp5hzBWYkP+825mkCfvFB1FWteGqgKYuXSw2lumdWqglkgSWjxQ5k g7/7qF+tVDlxzMld4tE2hDWYutXoNVb7vlGWf6tgdufmAJYjrV/lyCL6Qx82ey5zQAv6T3wVVZT WlTbH9+clYjhUwFUEX9Mo6WkbjkU43waaJ/NdiTVJt7035WPMeardgQJ2Bn7AuggJ7yFkgdf1pu rO2erC2kvpbxRyjXs03P4TTXc+nfWgWxxhOI6WhjC57HTYBFWGWMPeiTKo4oE1M0msICUqggHN0 iAXU3lNqXblFCYqzM2yUqFNf1OeeGl4R4oj8UW8mORUSIfJ7Myk1IOgi4HVSY9MGa7IpaMYNvxo qzZAxUb3hmvaqDDZdSEm281dEik+JqJOR2cZI3S1oGw6Yq21i1OUyzr/G+CNMQ2OwUVZA3WOSBM 79J0j0wIwGpoQMlnSjg== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIwMDA2OCBTYWx0ZWRfXxP/wjZr/5H0P ecU+QBzABhj1SigY07Cf+AFeO8T3Hp6ECIj9KWkfeABirJFZY42mTBU6iJR4x9pmxRUPNnerI55 IVGrRnIaLkiG20lVn5tUn8wOQVomVE4= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-20_03,2026-10-19_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 adultscore=0 phishscore=0 priorityscore=1501 bulkscore=0 malwarescore=0 suspectscore=0 spamscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610200068 On Mon, 19 Oct 2026 22:38:44 +0200 Pierre Gondois wrote: > Add dedicated GHES and EDAC callbacks for Memory Error Section 2 > records. Use a separate GHES notifier chain so existing consumers > continue to receive legacy memory error sections. > > Signed-off-by: Pierre Gondois I think this is is ok. I don't love the dual notifier chains but right now I also don't have a better idea. So a somewhat tentative Reviewed-by: Jonathan Cameron Jonathan > --- > drivers/acpi/apei/ghes.c | 49 +++++++++++++++- > drivers/edac/ghes_edac.c | 118 +++++++++++++++++++++++++++++++++++++++ > include/acpi/ghes.h | 2 + > 3 files changed, 168 insertions(+), 1 deletion(-) > > diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c > index fe10ab0e02f6..c7fb15543b56 100644 > --- a/drivers/acpi/apei/ghes.c > +++ b/drivers/acpi/apei/ghes.c > @@ -101,6 +101,7 @@ > #endif > > static ATOMIC_NOTIFIER_HEAD(ghes_report_chain); > +static ATOMIC_NOTIFIER_HEAD(ghes_report_mem2_chain); > > static inline bool is_hest_type_generic_v2(struct ghes *ghes) > { > @@ -551,6 +552,29 @@ static bool ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, > return false; > } > > +static bool ghes_handle_memory_failure2(struct acpi_hest_generic_data *gdata, > + int sev, bool sync) > +{ > + int flags = -1; > + int sec_sev = ghes_severity(gdata->error_severity); > + struct cper_sec_mem_err2 *mem_err = acpi_hest_get_payload(gdata); > + > + if (!(mem_err->validation_bits & CPER_MEM2_VALID_PA)) > + return false; > + > + /* iff following two events can be handled properly by now */ > + if (sec_sev == GHES_SEV_CORRECTED && > + (gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED)) > + flags = MF_SOFT_OFFLINE; > + if (sev == GHES_SEV_RECOVERABLE && sec_sev == GHES_SEV_RECOVERABLE) > + flags = sync ? MF_ACTION_REQUIRED : 0; > + > + if (flags != -1) > + return ghes_do_memory_failure(mem_err->physical_addr, flags); > + > + return false; > +} > + > static bool ghes_handle_arm_hw_error(struct acpi_hest_generic_data *gdata, > int sev, bool sync) > { > @@ -915,7 +939,8 @@ static void ghes_log_hwerr(int sev, guid_t *sec_type) > return; > } > > - if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) { > + if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM) || > + guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM2)) { > hwerr_log_error_type(HWERR_RECOV_MEMORY); > return; > } > @@ -952,6 +977,16 @@ static void ghes_do_proc(struct ghes *ghes, > > arch_apei_report_mem_error(sev, mem_err); > queued = ghes_handle_memory_failure(gdata, sev, sync); > + } else if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM2)) { > + struct cper_sec_mem_err2 *mem_err = acpi_hest_get_payload(gdata); > + > + if (gdata->error_data_length < sizeof(*mem_err)) { > + pr_warn(FW_WARN "Memory Error Section 2 length is too small\n"); > + continue; > + } > + > + atomic_notifier_call_chain(&ghes_report_mem2_chain, sev, mem_err); > + queued = ghes_handle_memory_failure2(gdata, sev, sync); > } else if (guid_equal(sec_type, &CPER_SEC_PCIE)) { > ghes_handle_aer(gdata); > } else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) { > @@ -1973,3 +2008,15 @@ void ghes_unregister_report_chain(struct notifier_block *nb) > atomic_notifier_chain_unregister(&ghes_report_chain, nb); > } > EXPORT_SYMBOL_GPL(ghes_unregister_report_chain); > + > +void ghes_register_report_mem2_chain(struct notifier_block *nb) > +{ > + atomic_notifier_chain_register(&ghes_report_mem2_chain, nb); > +} > +EXPORT_SYMBOL_GPL(ghes_register_report_mem2_chain); > + > +void ghes_unregister_report_mem2_chain(struct notifier_block *nb) > +{ > + atomic_notifier_chain_unregister(&ghes_report_mem2_chain, nb); > +} > +EXPORT_SYMBOL_GPL(ghes_unregister_report_mem2_chain); > diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c > index b90150c67f4b..01defc4e3bf1 100644 > --- a/drivers/edac/ghes_edac.c > +++ b/drivers/edac/ghes_edac.c > @@ -390,6 +390,122 @@ static struct notifier_block ghes_edac_mem_err_nb = { > .priority = 0, > }; > > +static int print_mem_error2_other_detail(const struct cper_sec_mem_err2 *mem, char *msg, > + const char *location, unsigned int len) > +{ > + u32 n; > + > + if (!msg) > + return 0; > + > + n = 0; > + len -= 1; > + > + n += scnprintf(msg + n, len - n, "APEI location: %s ", location); > + > + if (mem->validation_bits & CPER_MEM2_VALID_ERROR_STATUS) { > + n += scnprintf(msg + n, len - n, "status(0x%016llx): ", mem->error_status); > + n += scnprintf(msg + n, len - n, "%s ", > + cper_mem_err_status_str(mem->error_status)); > + } > + if (mem->validation_bits & CPER_MEM2_VALID_STATUS) > + n += scnprintf(msg + n, len - n, "section_status:0x%02x ", > + mem->status); > + > + msg[n] = '\0'; > + > + return n; > +} > + > +static int ghes_edac_report_mem_error2(struct notifier_block *nb, > + unsigned long val, void *data) > +{ > + struct cper_sec_mem_err2 *mem_err = data; > + struct edac_raw_error_desc *e; > + struct mem_ctl_info *mci; > + struct ghes_pvt *pvt; > + char *p; > + > + /* > + * We can do the locking below because GHES defers error processing > + * from NMI to IRQ context. Whenever that changes, we'd at least > + * know. > + */ > + if (WARN_ON_ONCE(in_nmi())) > + return NOTIFY_OK; > + > + guard(spinlock_irqsave)(&ghes_lock); > + > + pvt = ghes_pvt; > + if (!pvt) > + return NOTIFY_OK; > + > + mci = pvt->mci; > + e = ghes_edac_init_error(pvt, val); > + > + edac_dbg(1, "error validation_bits: 0x%08llx\n", > + (long long)mem_err->validation_bits); > + > + /* Error type, mapped on e->msg */ > + if (mem_err->validation_bits & CPER_MEM2_VALID_ERROR_TYPE) { > + u8 etype = mem_err->error_type; > + > + p = pvt->msg; > + p += snprintf(p, sizeof(pvt->msg), "%s", cper_mem_err_type_str(etype)); > + } else { > + strscpy(pvt->msg, "unknown error"); > + } > + > + /* Error address */ > + if (mem_err->validation_bits & CPER_MEM2_VALID_PA) { > + e->page_frame_number = PHYS_PFN(mem_err->physical_addr); > + e->offset_in_page = offset_in_page(mem_err->physical_addr); > + } > + > + /* Error grain */ > + if (mem_err->validation_bits & CPER_MEM2_VALID_PA_MASK) > + e->grain = ~mem_err->physical_addr_mask + 1; > + > + /* Memory error location, mapped on e->location */ > + p = e->location; > + p += cper_mem_err2_location(mem_err, p); > + > + if (mem_err->validation_bits & CPER_MEM2_VALID_MODULE_HANDLE) { > + struct dimm_info *dimm = NULL; > + > + p += cper_dimm_err2_location(mem_err, p); > + if (mem_err->mem_dev_handle <= U16_MAX) > + dimm = find_dimm_by_handle(mci, mem_err->mem_dev_handle); > + else > + pr_warn(FW_WARN "Memory Error Section 2 module handle 0x%x exceeds SMBIOS range\n", > + mem_err->mem_dev_handle); > + if (dimm) { > + e->top_layer = dimm->idx; > + strscpy(e->label, dimm->label); > + } > + } > + if (p > e->location) > + *(p - 1) = '\0'; > + > + if (!*e->label) > + strscpy(e->label, "unknown memory"); > + > + /* All other fields are mapped on e->other_detail */ > + p = pvt->other_detail; > + p += print_mem_error2_other_detail(mem_err, p, e->location, OTHER_DETAIL_LEN); > + if (p > pvt->other_detail) > + *(p - 1) = '\0'; > + > + edac_raw_mc_handle_error(e); > + > + return NOTIFY_OK; > +}