From nobody Sat Nov 23 17:43:42 2024 Received: from out30-100.freemail.mail.aliyun.com (out30-100.freemail.mail.aliyun.com [115.124.30.100]) (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 C9B061F778C; Tue, 12 Nov 2024 11:59:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.100 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731412756; cv=none; b=QAj6vUzHo2/Kvq0QzHpk82K8SVV9tjRzWH3AayvMgQqLkmVF/ExktonBL0a9kL0QOD9DCUaWfFIKvTkJVz3X8GGB9rDaUtT7ITOyMSxKEJpzCs9EMHS2gcvcnMnVa3czoasiUP8anxWkTnxpnFvidSh7XtG3wxKBCDMxYWuw13U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731412756; c=relaxed/simple; bh=MZPW3KmuIhosXQiR1sUnukYbEwz7Ryg7lEeyBumQp40=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Iq1Ik83ncUoB5KpXZ4KwSF64IuwrQ+uJ5yD9que9bVxNVh10/LBssavEHkRHJ6d+mEAUyvUS2l+51G2Mqmz/8JQsPsHXe3uFf5Qxrcdd4f7Fqh/ybWNwBrqx0oBLVikpDyeatLtCYnQSLR2nAV+3FzUR5y/hbc2OvpHOa/jOl64= 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=NxR/95k/; arc=none smtp.client-ip=115.124.30.100 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="NxR/95k/" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1731412745; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=7E4XIGVwFEQzfYl+p4x9wcXN7MWG+kSABSQ6uIWRSCk=; b=NxR/95k/U6jw94d2UPcWCY1K3lF9uGrIE7e183A1FdtzswL2uOyTKGBtk1ykqjMrlREU1W5FRlaLk0x6D6afQqrBK6bTer/ax/79XkplSxmjpYG1yTNOWvdFO1Wyt4HUDz49ziseVRoFjMhBZOei+zaYRaJ1G0+f/8YoNE4zsXs= Received: from localhost.localdomain(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0WJHYqx9_1731412744 cluster:ay36) by smtp.aliyun-inc.com; Tue, 12 Nov 2024 19:59:05 +0800 From: Shuai Xue To: lukas@wunner.de, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org Cc: bhelgaas@google.com, tony.luck@intel.com, bp@alien8.de, xueshuai@linux.alibaba.com Subject: [PATCH v2 2/2] pci: pciehp: Generate tracepoints for hotplug event Date: Tue, 12 Nov 2024 19:58:52 +0800 Message-ID: <20241112115852.52980-3-xueshuai@linux.alibaba.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20241112115852.52980-1-xueshuai@linux.alibaba.com> References: <20241112115852.52980-1-xueshuai@linux.alibaba.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Generate tracepoints for hotplug event. The output like below: $ 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, trans_state:Link Down <...>-206 [001] ..... 40.374871: pci_hp_event: 0000:00:02= .0 slot:10, trans_state:Card not present Signed-off-by: Shuai Xue --- drivers/pci/hotplug/pciehp_ctrl.c | 33 +++++++++++++++++++++++++------ 1 file changed, 27 insertions(+), 6 deletions(-) diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp= _ctrl.c index dcdbfcf404dd..ba099cb19f5e 100644 --- a/drivers/pci/hotplug/pciehp_ctrl.c +++ b/drivers/pci/hotplug/pciehp_ctrl.c @@ -21,6 +21,9 @@ #include #include "pciehp.h" =20 +#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 con= troller *ctrl, u32 events) case ON_STATE: ctrl->state =3D 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_NO_PRESENT); + } pciehp_disable_slot(ctrl, SURPRISE_REMOVAL); break; default: @@ -264,6 +275,9 @@ void pciehp_handle_presence_or_link_change(struct contr= oller *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_NO_PRESENT); } mutex_unlock(&ctrl->state_lock); return; @@ -276,12 +290,19 @@ void pciehp_handle_presence_or_link_change(struct con= troller *ctrl, u32 events) case OFF_STATE: ctrl->state =3D 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 =3D pciehp_enable_slot(ctrl); break; default: --=20 2.39.3