linux-kernel - [PATCH v2 2/2] PCI/ERR: s390/pci: Use pci_uevent

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Message-Id: <20250623-add_err_uevents-v2-2-a3a2cf8e711d@linux.ibm.com>
Date: Mon, 23 Jun 2025 10:41:33 +0200
From: Niklas Schnelle <schnelle@...ux.ibm.com>
To: Lukas Wunner <lukas@...ner.de>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>, Sinan Kaya <okaya@...nel.org>,
        Keith Busch <kbusch@...nel.org>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Niklas Schnelle <schnelle@...ux.ibm.com>
Subject: [PATCH v2 2/2] PCI/ERR: s390/pci: Use pci_uevent_ers() in PCI
 recovery

Issue uevents during PCI recovery using pci_uevent_ers() as done by EEH
and AER PCIe recovery routines.

Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
---
 arch/s390/pci/pci_event.c | 3 +++
 drivers/pci/pci-driver.c  | 2 +-
 include/linux/pci.h       | 2 +-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c
index 2fbee3887d13aa28e0621aa7b6d673f4517b5461..cdbe603ec2f59d95ff92210742d39d7c20f26186 100644
--- a/arch/s390/pci/pci_event.c
+++ b/arch/s390/pci/pci_event.c
@@ -91,6 +91,7 @@ static pci_ers_result_t zpci_event_notify_error_detected(struct pci_dev *pdev,
 	pci_ers_result_t ers_res = PCI_ERS_RESULT_DISCONNECT;
 
 	ers_res = driver->err_handler->error_detected(pdev,  pdev->error_state);
+	pci_uevent_ers(pdev, ers_res);
 	if (ers_result_indicates_abort(ers_res))
 		pr_info("%s: Automatic recovery failed after initial reporting\n", pci_name(pdev));
 	else if (ers_res == PCI_ERS_RESULT_NEED_RESET)
@@ -226,6 +227,7 @@ static pci_ers_result_t zpci_event_attempt_error_recovery(struct pci_dev *pdev)
 		ers_res = zpci_event_do_reset(pdev, driver);
 
 	if (ers_res != PCI_ERS_RESULT_RECOVERED) {
+		pci_uevent_ers(pdev, PCI_ERS_RESULT_DISCONNECT);
 		pr_err("%s: Automatic recovery failed; operator intervention is required\n",
 		       pci_name(pdev));
 		status_str = "failed (driver can't recover)";
@@ -235,6 +237,7 @@ static pci_ers_result_t zpci_event_attempt_error_recovery(struct pci_dev *pdev)
 	pr_info("%s: The device is ready to resume operations\n", pci_name(pdev));
 	if (driver->err_handler->resume)
 		driver->err_handler->resume(pdev);
+	pci_uevent_ers(pdev, PCI_ERS_RESULT_RECOVERED);
 out_unlock:
 	pci_dev_unlock(pdev);
 	zpci_report_status(zdev, "recovery", status_str);
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 94ba6938b7c6271b557cc7f17ffb89631d83827e..2f3037050fd011108ef93e39d2d78a5c7e22fd05 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -1578,7 +1578,7 @@ static int pci_uevent(const struct device *dev, struct kobj_uevent_env *env)
 	return 0;
 }
 
-#if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
+#if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH) || defined(CONFIG_S390)
 /**
  * pci_uevent_ers - emit a uevent during recovery path of PCI device
  * @pdev: PCI device undergoing error recovery
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 05e68f35f39238f8b9ce08df97b384d1c1e89bbe..bcc412a21d93a6dcc566f011258ed39d80d896c2 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2737,7 +2737,7 @@ static inline bool pci_is_thunderbolt_attached(struct pci_dev *pdev)
 	return false;
 }
 
-#if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH)
+#if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH) || defined(CONFIG_S390)
 void pci_uevent_ers(struct pci_dev *pdev, enum  pci_ers_result err_type);
 #endif
 

-- 
2.48.1