From patchwork Wed Nov 20 12:43:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuai Xue X-Patchwork-Id: 13881148 Received: from out30-130.freemail.mail.aliyun.com (out30-130.freemail.mail.aliyun.com [115.124.30.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F16EC15853A; Wed, 20 Nov 2024 12:43:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.130 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732106626; cv=none; b=pZBVJzwtzVr+2xOcOZBDk3hq+rJaE3WbqfNCoc39rd60dNHlVuVdGt2TBE8CzLvIaAxJAmQ9qzcdhgV4rOYsXyTkFkZ4m7p5PeG8OYCeplI1dtECBSGXieKekwnshdotkH1hMXAHDjSirprIALqXfbGf5mCdGNhILYGL0M4yYGI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732106626; c=relaxed/simple; bh=Sy/24vCtalzBy9cewhxqpDBJTPMyuTbSN2ylAJAZPoY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Xk8bRh4sNtRn9EYi6zykxZIa0WZHPMW/GS6wG0WLunGU8myRnJBiiUGQD7NvI/e4+GXr/HMygbgLO+WoEb0c+90ryWYoT0Cq/5PWs1Wl5fP5Xtcb7kEI42+9QaYHw8bn6XuDXsLMH20jPaHwAsMiojpmA1FEbtcf2iLKLrlOcp0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=wSpFX51F; arc=none smtp.client-ip=115.124.30.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="wSpFX51F" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1732106620; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=gLT40FZ+81v0Eqhr0GbgNNBehD1MtVLP6/eTiVEMBUc=; b=wSpFX51FT6jyZllSzn++qrhUeydFzxRLiWytzBo2nbeHcOXndixin2tL9FWlS0JZL4qfneN9tzxAxDP6BcM8R6S0ZnNzVtbHRhBPGOQo7qfgg2AFpL+upiO4DJp2z4xUua4FxsOa2Y6kGjG7e3PGgPUBFoVXryVvcio8bPUPFZA= Received: from localhost.localdomain(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0WJsTPTF_1732106617 cluster:ay36) by smtp.aliyun-inc.com; Wed, 20 Nov 2024 20:43:38 +0800 From: Shuai Xue To: lukas@wunner.de, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: bhelgaas@google.com, tony.luck@intel.com, bp@alien8.de, xueshuai@linux.alibaba.com, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, oleg@redhat.com, naveen@kernel.org, davem@davemloft.net, anil.s.keshavamurthy@intel.com, mark.rutland@arm.com, peterz@infradead.org Subject: [PATCH v3] PCI: hotplug: Add a generic RAS tracepoint for hotplug event Date: Wed, 20 Nov 2024 20:43:28 +0800 Message-ID: <20241120124328.19111-1-xueshuai@linux.alibaba.com> X-Mailer: git-send-email 2.44.0 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Hotplug events are critical indicators for analyzing hardware health, particularly in AI supercomputers where surprise link downs can significantly impact system performance and reliability. The failure characterization analysis illustrates the significance of failures caused by the Infiniband link errors. Meta observes that 2% in a machine learning cluster and 6% in a vision application cluster of Infiniband failures co-occur with GPU failures, such as falling off the bus, which may indicate a correlation with PCIe.[1] To enhance hardware health monitoring and diagnostics, introduces a generic tracepoint for hotplug events. Additionally, specific tracepoints for PCIe hotplug events are generated. To enable userspace monitoring of these tracepoints, for instance using tools like rasdaemon, the `pci_hotplug_event` is included in the UAPI (User API) header. $ echo 1 > /sys/kernel/debug/tracing/events/hotplug/pci_hp_event/enable $ cat /sys/kernel/debug/tracing/trace_pipe <...>-206 [001] ..... 40.373870: pci_hp_event: 0000:00:02.0 slot:10, event:Link Down <...>-206 [001] ..... 40.374871: pci_hp_event: 0000:00:02.0 slot:10, event:Card not present [1]https://arxiv.org/abs/2410.21680 Signed-off-by: Shuai Xue --- changes since v2 per Lukas: - rewrite commit log to note why add pci_hotplug_event in the UAPI header. - define TRACE_SYSTEM as pci_hotplug to avoid conflict with other - squash previous two commits into one. - rename _TRANS_STATE as _EVENT - rename PCI_HOTPLUG_CARD_NO_PRESENT as PCI_HOTPLUG_CARD_NOT_PRESENT --- drivers/pci/hotplug/pciehp_ctrl.c | 33 ++++++++++++--- drivers/pci/hotplug/trace.h | 68 +++++++++++++++++++++++++++++++ include/uapi/linux/pci.h | 7 ++++ 3 files changed, 102 insertions(+), 6 deletions(-) create mode 100644 drivers/pci/hotplug/trace.h diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c index dcdbfcf404dd..c836462ff067 100644 --- a/drivers/pci/hotplug/pciehp_ctrl.c +++ b/drivers/pci/hotplug/pciehp_ctrl.c @@ -21,6 +21,9 @@ #include #include "pciehp.h" +#define CREATE_TRACE_POINTS +#include "trace.h" + /* The following routines constitute the bulk of the hotplug controller logic */ @@ -239,12 +242,20 @@ void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events) case ON_STATE: ctrl->state = POWEROFF_STATE; mutex_unlock(&ctrl->state_lock); - if (events & PCI_EXP_SLTSTA_DLLSC) + if (events & PCI_EXP_SLTSTA_DLLSC) { ctrl_info(ctrl, "Slot(%s): Link Down\n", slot_name(ctrl)); - if (events & PCI_EXP_SLTSTA_PDC) + trace_pci_hp_event(pci_name(ctrl->pcie->port), + slot_name(ctrl), + PCI_HOTPLUG_LINK_DOWN); + } + if (events & PCI_EXP_SLTSTA_PDC) { ctrl_info(ctrl, "Slot(%s): Card not present\n", slot_name(ctrl)); + trace_pci_hp_event(pci_name(ctrl->pcie->port), + slot_name(ctrl), + PCI_HOTPLUG_CARD_NOT_PRESENT); + } pciehp_disable_slot(ctrl, SURPRISE_REMOVAL); break; default: @@ -264,6 +275,9 @@ void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events) INDICATOR_NOOP); ctrl_info(ctrl, "Slot(%s): Card not present\n", slot_name(ctrl)); + trace_pci_hp_event(pci_name(ctrl->pcie->port), + slot_name(ctrl), + PCI_HOTPLUG_CARD_NOT_PRESENT); } mutex_unlock(&ctrl->state_lock); return; @@ -276,12 +290,19 @@ void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events) case OFF_STATE: ctrl->state = POWERON_STATE; mutex_unlock(&ctrl->state_lock); - if (present) + if (present) { ctrl_info(ctrl, "Slot(%s): Card present\n", slot_name(ctrl)); - if (link_active) - ctrl_info(ctrl, "Slot(%s): Link Up\n", - slot_name(ctrl)); + trace_pci_hp_event(pci_name(ctrl->pcie->port), + slot_name(ctrl), + PCI_HOTPLUG_CARD_PRESENT); + } + if (link_active) { + ctrl_info(ctrl, "Slot(%s): Link Up\n", slot_name(ctrl)); + trace_pci_hp_event(pci_name(ctrl->pcie->port), + slot_name(ctrl), + PCI_HOTPLUG_LINK_UP); + } ctrl->request_result = pciehp_enable_slot(ctrl); break; default: diff --git a/drivers/pci/hotplug/trace.h b/drivers/pci/hotplug/trace.h new file mode 100644 index 000000000000..45e4ca8b83c4 --- /dev/null +++ b/drivers/pci/hotplug/trace.h @@ -0,0 +1,68 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#if !defined(_TRACE_HW_EVENT_PCI_HP_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_HW_EVENT_PCI_HP_H + +#include + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM pci_hotplug + +#define PCI_HOTPLUG_EVENT \ + EM(PCI_HOTPLUG_LINK_UP, "Link Up") \ + EM(PCI_HOTPLUG_LINK_DOWN, "Link Down") \ + EM(PCI_HOTPLUG_CARD_PRESENT, "Card present") \ + EMe(PCI_HOTPLUG_CARD_NOT_PRESENT, "Card not present") + +/* Enums require being exported to userspace, for user tool parsing */ +#undef EM +#undef EMe +#define EM(a, b) TRACE_DEFINE_ENUM(a); +#define EMe(a, b) TRACE_DEFINE_ENUM(a); + +PCI_HOTPLUG_EVENT + +/* + * Now redefine the EM() and EMe() macros to map the enums to the strings + * that will be printed in the output. + */ +#undef EM +#undef EMe +#define EM(a, b) {a, b}, +#define EMe(a, b) {a, b} + +TRACE_EVENT(pci_hp_event, + + TP_PROTO(const char *port_name, + const char *slot, + const int event), + + TP_ARGS(port_name, slot, event), + + TP_STRUCT__entry( + __string( port_name, port_name ) + __string( slot, slot ) + __field( int, event ) + ), + + TP_fast_assign( + __assign_str(port_name); + __assign_str(slot); + __entry->event = event; + ), + + TP_printk("%s slot:%s, event:%s\n", + __get_str(port_name), + __get_str(slot), + __print_symbolic(__entry->event, PCI_HOTPLUG_EVENT) + ) +); + +#endif /* _TRACE_HW_EVENT_PCI_HP_H */ + +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH ../../drivers/pci/hotplug +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE trace + +/* This part must be outside protection */ +#include diff --git a/include/uapi/linux/pci.h b/include/uapi/linux/pci.h index a769eefc5139..4f150028965d 100644 --- a/include/uapi/linux/pci.h +++ b/include/uapi/linux/pci.h @@ -39,4 +39,11 @@ #define PCIIOC_MMAP_IS_MEM (PCIIOC_BASE | 0x02) /* Set mmap state to MEM space. */ #define PCIIOC_WRITE_COMBINE (PCIIOC_BASE | 0x03) /* Enable/disable write-combining. */ +enum pci_hotplug_event { + PCI_HOTPLUG_LINK_UP, + PCI_HOTPLUG_LINK_DOWN, + PCI_HOTPLUG_CARD_PRESENT, + PCI_HOTPLUG_CARD_NOT_PRESENT, +}; + #endif /* _UAPILINUX_PCI_H */