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[2620:137:e000::1:20]) by mx.google.com with ESMTP id dn5-20020a17090794c500b0078dcd448f99si22027ejc.855.2022.11.10.11.07.14; Thu, 10 Nov 2022 11:07:39 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=Apt6dHGi; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231575AbiKJTF6 (ORCPT + 99 others); Thu, 10 Nov 2022 14:05:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48700 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231499AbiKJTFd (ORCPT ); Thu, 10 Nov 2022 14:05:33 -0500 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1035A57B58; Thu, 10 Nov 2022 11:05:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1668107111; x=1699643111; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=i9QLVcvjrWi2bU5ScvvMmPNidfmPBzVUn1G+fNtFVRU=; b=Apt6dHGiKkJJLj147v3I9OqtXZzXMyZ/GoW/S+w7yHyLiDXMs57FnMgx vg67yHpNCuGMfR14YQfIMFAESP3CQnvWJGr8ed2/4+VcU+zXsVtb+US8Q W2aQHzszlB07JYzvc5NZPrOuaMNUd072nUfgeZA9KFsqGeBk3yEHNAT2j 34DtxSPDCan1561f8dNMtSyxS0ZvvTNQx9pPP1MBMKtJGWpVG9fefJUne e5/TiqZe8rgOdjFAfVlLJheuyNQxf5VxDX0dpgoA+UR64iWGh8hyHMRU3 Rhp7MtgBJVsj5JoPN0w1Myf0auZT/hSff4YWOuxEhysBVd8ZaqN1uFwQf A==; X-IronPort-AV: E=McAfee;i="6500,9779,10527"; a="375662059" X-IronPort-AV: E=Sophos;i="5.96,154,1665471600"; d="scan'208";a="375662059" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Nov 2022 10:58:05 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10527"; a="882473403" X-IronPort-AV: E=Sophos;i="5.96,154,1665471600"; d="scan'208";a="882473403" Received: from iweiny-mobl.amr.corp.intel.com (HELO localhost) ([10.212.6.223]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Nov 2022 10:58:05 -0800 From: ira.weiny@intel.com To: Dan Williams Cc: Ira Weiny , Steven Rostedt , Alison Schofield , Vishal Verma , Ben Widawsky , Jonathan Cameron , Davidlohr Bueso , linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org Subject: [PATCH 02/11] cxl/mem: Implement Get Event Records command Date: Thu, 10 Nov 2022 10:57:49 -0800 Message-Id: <20221110185758.879472-3-ira.weiny@intel.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20221110185758.879472-1-ira.weiny@intel.com> References: <20221110185758.879472-1-ira.weiny@intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749137237431094886?= X-GMAIL-MSGID: =?utf-8?q?1749137237431094886?= From: Ira Weiny CXL devices have multiple event logs which can be queried for CXL event records. Devices are required to support the storage of at least one event record in each event log type. Devices track event log overflow by incrementing a counter and tracking the time of the first and last overflow event seen. Software queries events via the Get Event Record mailbox command; CXL rev 3.0 section 8.2.9.2.2. Issue the Get Event Record mailbox command on driver load. Trace each record found with a generic record trace. Trace any overflow conditions. The device can return up to 1MB worth of event records per query. This presents complications with allocating a huge buffers to potentially capture all the records. It is not anticipated that these event logs will be very deep and reading them does not need to be performant. Process only 3 records at a time. 3 records was chosen as it fits comfortably on the stack to prevent dynamic allocation while still cutting down on extra mailbox messages. This patch traces a raw event record only and leaves the specific event record types to subsequent patches. Macros are created to use for tracing the common CXL Event header fields. Cc: Steven Rostedt Signed-off-by: Ira Weiny Reviewed-by: Dave Jiang --- Change from RFC v2: Support reading 3 events at once. Reverse Jonathan's suggestion and check for positive number of records. Because the record count may have been returned as something > 3 based on what the device thinks it can send back even though the core Linux mbox processing truncates the data. Alison and Dave Jiang Change header uuid type to uuid_t for better user space processing Smita Check status reg before reading log. Steven Prefix all trace points with 'cxl_' Use static branch _enabled() calls Jonathan s/CXL_EVENT_TYPE_INFO/0 s/{first,last}/{first,last}_ts Remove Reserved field from header Fix header issue for cxl_event_log_type_str() Change from RFC: Remove redundant error message in get event records loop s/EVENT_RECORD_DATA_LENGTH/CXL_EVENT_RECORD_DATA_LENGTH Use hdr_uuid for the header UUID field Use cxl_event_log_type_str() for the trace events Create macros for the header fields and common entries of each event Add reserved buffer output dump Report error if event query fails Remove unused record_cnt variable Steven - reorder overflow record Remove NOTE about checkpatch Jonathan check for exactly 1 record s/v3.0/rev 3.0 Use 3 byte fields for 24bit fields Add 3.0 Maintenance Operation Class Add Dynamic Capacity log type Fix spelling Dave Jiang/Dan/Alison s/cxl-event/cxl trace/events/cxl-events => trace/events/cxl.h s/cxl_event_overflow/overflow s/cxl_event/generic_event --- MAINTAINERS | 1 + drivers/cxl/core/mbox.c | 70 +++++++++++++++++++ drivers/cxl/cxl.h | 8 +++ drivers/cxl/cxlmem.h | 73 ++++++++++++++++++++ include/trace/events/cxl.h | 127 +++++++++++++++++++++++++++++++++++ include/uapi/linux/cxl_mem.h | 1 + 6 files changed, 280 insertions(+) create mode 100644 include/trace/events/cxl.h diff --git a/MAINTAINERS b/MAINTAINERS index ca063a504026..4b7c6e3055c6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5223,6 +5223,7 @@ M: Dan Williams L: linux-cxl@vger.kernel.org S: Maintained F: drivers/cxl/ +F: include/trace/events/cxl.h F: include/uapi/linux/cxl_mem.h CONEXANT ACCESSRUNNER USB DRIVER diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index 16176b9278b4..a908b95a7de4 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -7,6 +7,9 @@ #include #include +#define CREATE_TRACE_POINTS +#include + #include "core.h" static bool cxl_raw_allow_all; @@ -48,6 +51,7 @@ static struct cxl_mem_command cxl_mem_commands[CXL_MEM_COMMAND_ID_MAX] = { CXL_CMD(RAW, CXL_VARIABLE_PAYLOAD, CXL_VARIABLE_PAYLOAD, 0), #endif CXL_CMD(GET_SUPPORTED_LOGS, 0, CXL_VARIABLE_PAYLOAD, CXL_CMD_FLAG_FORCE_ENABLE), + CXL_CMD(GET_EVENT_RECORD, 1, CXL_VARIABLE_PAYLOAD, 0), CXL_CMD(GET_FW_INFO, 0, 0x50, 0), CXL_CMD(GET_PARTITION_INFO, 0, 0x20, 0), CXL_CMD(GET_LSA, 0x8, CXL_VARIABLE_PAYLOAD, 0), @@ -704,6 +708,72 @@ int cxl_enumerate_cmds(struct cxl_dev_state *cxlds) } EXPORT_SYMBOL_NS_GPL(cxl_enumerate_cmds, CXL); +static void cxl_mem_get_records_log(struct cxl_dev_state *cxlds, + enum cxl_event_log_type type) +{ + struct cxl_get_event_payload payload; + u16 pl_nr; + + do { + u8 log_type = type; + int rc; + + rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_GET_EVENT_RECORD, + &log_type, sizeof(log_type), + &payload, sizeof(payload)); + if (rc) { + dev_err(cxlds->dev, "Event log '%s': Failed to query event records : %d", + cxl_event_log_type_str(type), rc); + return; + } + + pl_nr = le16_to_cpu(payload.record_count); + if (trace_cxl_generic_event_enabled()) { + u16 nr_rec = min_t(u16, pl_nr, CXL_GET_EVENT_NR_RECORDS); + int i; + + for (i = 0; i < nr_rec; i++) + trace_cxl_generic_event(dev_name(cxlds->dev), + type, + &payload.record[i]); + } + + if (trace_cxl_overflow_enabled() && + (payload.flags & CXL_GET_EVENT_FLAG_OVERFLOW)) + trace_cxl_overflow(dev_name(cxlds->dev), type, &payload); + + } while (pl_nr > CXL_GET_EVENT_NR_RECORDS || + payload.flags & CXL_GET_EVENT_FLAG_MORE_RECORDS); +} + +/** + * cxl_mem_get_event_records - Get Event Records from the device + * @cxlds: The device data for the operation + * + * Retrieve all event records available on the device and report them as trace + * events. + * + * See CXL rev 3.0 @8.2.9.2.2 Get Event Records + */ +void cxl_mem_get_event_records(struct cxl_dev_state *cxlds) +{ + u32 status = readl(cxlds->regs.status + CXLDEV_DEV_EVENT_STATUS_OFFSET); + + dev_dbg(cxlds->dev, "Reading event logs: %x\n", status); + + if (status & CXLDEV_EVENT_STATUS_INFO) + cxl_mem_get_records_log(cxlds, CXL_EVENT_TYPE_INFO); + if (status & CXLDEV_EVENT_STATUS_WARN) + cxl_mem_get_records_log(cxlds, CXL_EVENT_TYPE_WARN); + if (status & CXLDEV_EVENT_STATUS_FAIL) + cxl_mem_get_records_log(cxlds, CXL_EVENT_TYPE_FAIL); + if (status & CXLDEV_EVENT_STATUS_FATAL) + cxl_mem_get_records_log(cxlds, CXL_EVENT_TYPE_FATAL); + if (status & CXLDEV_EVENT_STATUS_DYNAMIC_CAP) + cxl_mem_get_records_log(cxlds, CXL_EVENT_TYPE_DYNAMIC_CAP); +} +EXPORT_SYMBOL_NS_GPL(cxl_mem_get_event_records, CXL); + /** * cxl_mem_get_partition_info - Get partition info * @cxlds: The device data for the operation diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index f680450f0b16..492cff1bea6d 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -132,6 +132,14 @@ static inline int ways_to_cxl(unsigned int ways, u8 *iw) #define CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX 0x3 #define CXLDEV_CAP_CAP_ID_MEMDEV 0x4000 +/* CXL 3.0 8.2.8.3.1 Event Status Register */ +#define CXLDEV_DEV_EVENT_STATUS_OFFSET 0x00 +#define CXLDEV_EVENT_STATUS_INFO BIT(0) +#define CXLDEV_EVENT_STATUS_WARN BIT(1) +#define CXLDEV_EVENT_STATUS_FAIL BIT(2) +#define CXLDEV_EVENT_STATUS_FATAL BIT(3) +#define CXLDEV_EVENT_STATUS_DYNAMIC_CAP BIT(4) + /* CXL 2.0 8.2.8.4 Mailbox Registers */ #define CXLDEV_MBOX_CAPS_OFFSET 0x00 #define CXLDEV_MBOX_CAP_PAYLOAD_SIZE_MASK GENMASK(4, 0) diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index b7b955ded3ac..da64ba0f156b 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -4,6 +4,7 @@ #define __CXL_MEM_H__ #include #include +#include #include "cxl.h" /* CXL 2.0 8.2.8.5.1.1 Memory Device Status Register */ @@ -256,6 +257,7 @@ struct cxl_dev_state { enum cxl_opcode { CXL_MBOX_OP_INVALID = 0x0000, CXL_MBOX_OP_RAW = CXL_MBOX_OP_INVALID, + CXL_MBOX_OP_GET_EVENT_RECORD = 0x0100, CXL_MBOX_OP_GET_FW_INFO = 0x0200, CXL_MBOX_OP_ACTIVATE_FW = 0x0202, CXL_MBOX_OP_GET_SUPPORTED_LOGS = 0x0400, @@ -325,6 +327,76 @@ struct cxl_mbox_identify { u8 qos_telemetry_caps; } __packed; +/* + * Common Event Record Format + * CXL rev 3.0 section 8.2.9.2.1; Table 8-42 + */ +struct cxl_event_record_hdr { + uuid_t id; + u8 length; + u8 flags[3]; + __le16 handle; + __le16 related_handle; + __le64 timestamp; + u8 maint_op_class; + u8 reserved[0xf]; +} __packed; + +#define CXL_EVENT_RECORD_DATA_LENGTH 0x50 +struct cxl_event_record_raw { + struct cxl_event_record_hdr hdr; + u8 data[CXL_EVENT_RECORD_DATA_LENGTH]; +} __packed; + +/* + * Get Event Records output payload + * CXL rev 3.0 section 8.2.9.2.2; Table 8-50 + */ +#define CXL_GET_EVENT_FLAG_OVERFLOW BIT(0) +#define CXL_GET_EVENT_FLAG_MORE_RECORDS BIT(1) +#define CXL_GET_EVENT_NR_RECORDS 3 +struct cxl_get_event_payload { + u8 flags; + u8 reserved1; + __le16 overflow_err_count; + __le64 first_overflow_timestamp; + __le64 last_overflow_timestamp; + __le16 record_count; + u8 reserved2[0xa]; + struct cxl_event_record_raw record[CXL_GET_EVENT_NR_RECORDS]; +} __packed; + +/* + * CXL rev 3.0 section 8.2.9.2.2; Table 8-49 + */ +enum cxl_event_log_type { + CXL_EVENT_TYPE_INFO = 0x00, + CXL_EVENT_TYPE_WARN, + CXL_EVENT_TYPE_FAIL, + CXL_EVENT_TYPE_FATAL, + CXL_EVENT_TYPE_DYNAMIC_CAP, + CXL_EVENT_TYPE_MAX +}; + +static inline const char *cxl_event_log_type_str(enum cxl_event_log_type type) +{ + switch (type) { + case CXL_EVENT_TYPE_INFO: + return "Informational"; + case CXL_EVENT_TYPE_WARN: + return "Warning"; + case CXL_EVENT_TYPE_FAIL: + return "Failure"; + case CXL_EVENT_TYPE_FATAL: + return "Fatal"; + case CXL_EVENT_TYPE_DYNAMIC_CAP: + return "Dynamic Capacity"; + default: + break; + } + return ""; +} + struct cxl_mbox_get_partition_info { __le64 active_volatile_cap; __le64 active_persistent_cap; @@ -384,6 +456,7 @@ int cxl_mem_create_range_info(struct cxl_dev_state *cxlds); struct cxl_dev_state *cxl_dev_state_create(struct device *dev); void set_exclusive_cxl_commands(struct cxl_dev_state *cxlds, unsigned long *cmds); void clear_exclusive_cxl_commands(struct cxl_dev_state *cxlds, unsigned long *cmds); +void cxl_mem_get_event_records(struct cxl_dev_state *cxlds); #ifdef CONFIG_CXL_SUSPEND void cxl_mem_active_inc(void); void cxl_mem_active_dec(void); diff --git a/include/trace/events/cxl.h b/include/trace/events/cxl.h new file mode 100644 index 000000000000..60dec9a84918 --- /dev/null +++ b/include/trace/events/cxl.h @@ -0,0 +1,127 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM cxl + +#if !defined(_CXL_TRACE_EVENTS_H) || defined(TRACE_HEADER_MULTI_READ) +#define _CXL_TRACE_EVENTS_H + +#include +#include +#include + +TRACE_EVENT(cxl_overflow, + + TP_PROTO(const char *dev_name, enum cxl_event_log_type log, + struct cxl_get_event_payload *payload), + + TP_ARGS(dev_name, log, payload), + + TP_STRUCT__entry( + __string(dev_name, dev_name) + __field(int, log) + __field(u64, first_ts) + __field(u64, last_ts) + __field(u16, count) + ), + + TP_fast_assign( + __assign_str(dev_name, dev_name); + __entry->log = log; + __entry->count = le16_to_cpu(payload->overflow_err_count); + __entry->first_ts = le64_to_cpu(payload->first_overflow_timestamp); + __entry->last_ts = le64_to_cpu(payload->last_overflow_timestamp); + ), + + TP_printk("%s: EVENT LOG OVERFLOW log=%s : %u records from %llu to %llu", + __get_str(dev_name), cxl_event_log_type_str(__entry->log), + __entry->count, __entry->first_ts, __entry->last_ts) + +); + +/* + * Common Event Record Format + * CXL 3.0 section 8.2.9.2.1; Table 8-42 + */ +#define CXL_EVENT_RECORD_FLAG_PERMANENT BIT(2) +#define CXL_EVENT_RECORD_FLAG_MAINT_NEEDED BIT(3) +#define CXL_EVENT_RECORD_FLAG_PERF_DEGRADED BIT(4) +#define CXL_EVENT_RECORD_FLAG_HW_REPLACE BIT(5) +#define show_hdr_flags(flags) __print_flags(flags, " | ", \ + { CXL_EVENT_RECORD_FLAG_PERMANENT, "Permanent Condition" }, \ + { CXL_EVENT_RECORD_FLAG_MAINT_NEEDED, "Maintenance Needed" }, \ + { CXL_EVENT_RECORD_FLAG_PERF_DEGRADED, "Performance Degraded" }, \ + { CXL_EVENT_RECORD_FLAG_HW_REPLACE, "Hardware Replacement Needed" } \ +) + +/* + * Define macros for the common header of each CXL event. + * + * Tracepoints using these macros must do 3 things: + * + * 1) Add CXL_EVT_TP_entry to TP_STRUCT__entry + * 2) Use CXL_EVT_TP_fast_assign within TP_fast_assign; + * pass the dev_name, log, and CXL event header + * 3) Use CXL_EVT_TP_printk() instead of TP_printk() + * + * See the generic_event tracepoint as an example. + */ +#define CXL_EVT_TP_entry \ + __string(dev_name, dev_name) \ + __field(int, log) \ + __field_struct(uuid_t, hdr_uuid) \ + __field(u32, hdr_flags) \ + __field(u16, hdr_handle) \ + __field(u16, hdr_related_handle) \ + __field(u64, hdr_timestamp) \ + __field(u8, hdr_length) \ + __field(u8, hdr_maint_op_class) + +#define CXL_EVT_TP_fast_assign(dname, l, hdr) \ + __assign_str(dev_name, (dname)); \ + __entry->log = (l); \ + memcpy(&__entry->hdr_uuid, &(hdr).id, sizeof(uuid_t)); \ + __entry->hdr_length = (hdr).length; \ + __entry->hdr_flags = get_unaligned_le24((hdr).flags); \ + __entry->hdr_handle = le16_to_cpu((hdr).handle); \ + __entry->hdr_related_handle = le16_to_cpu((hdr).related_handle); \ + __entry->hdr_timestamp = le64_to_cpu((hdr).timestamp); \ + __entry->hdr_maint_op_class = (hdr).maint_op_class + + +#define CXL_EVT_TP_printk(fmt, ...) \ + TP_printk("%s log=%s : time=%llu uuid=%pUb len=%d flags='%s' " \ + "handle=%x related_handle=%x maint_op_class=%u" \ + " : " fmt, \ + __get_str(dev_name), cxl_event_log_type_str(__entry->log), \ + __entry->hdr_timestamp, &__entry->hdr_uuid, __entry->hdr_length,\ + show_hdr_flags(__entry->hdr_flags), __entry->hdr_handle, \ + __entry->hdr_related_handle, __entry->hdr_maint_op_class, \ + ##__VA_ARGS__) + +TRACE_EVENT(cxl_generic_event, + + TP_PROTO(const char *dev_name, enum cxl_event_log_type log, + struct cxl_event_record_raw *rec), + + TP_ARGS(dev_name, log, rec), + + TP_STRUCT__entry( + CXL_EVT_TP_entry + __array(u8, data, CXL_EVENT_RECORD_DATA_LENGTH) + ), + + TP_fast_assign( + CXL_EVT_TP_fast_assign(dev_name, log, rec->hdr); + memcpy(__entry->data, &rec->data, CXL_EVENT_RECORD_DATA_LENGTH); + ), + + CXL_EVT_TP_printk("%s", + __print_hex(__entry->data, CXL_EVENT_RECORD_DATA_LENGTH)) +); + +#endif /* _CXL_TRACE_EVENTS_H */ + +/* This part must be outside protection */ +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE cxl +#include diff --git a/include/uapi/linux/cxl_mem.h b/include/uapi/linux/cxl_mem.h index c71021a2a9ed..70459be5bdd4 100644 --- a/include/uapi/linux/cxl_mem.h +++ b/include/uapi/linux/cxl_mem.h @@ -24,6 +24,7 @@ ___C(IDENTIFY, "Identify Command"), \ ___C(RAW, "Raw device command"), \ ___C(GET_SUPPORTED_LOGS, "Get Supported Logs"), \ + ___C(GET_EVENT_RECORD, "Get Event Record"), \ ___C(GET_FW_INFO, "Get FW Info"), \ ___C(GET_PARTITION_INFO, "Get Partition Information"), \ ___C(GET_LSA, "Get Label Storage Area"), \