{"id":2222861,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2222861/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260413210608.2912-5-alifm@linux.ibm.com/","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/1.1/projects/28/?format=json","name":"Linux PCI development","link_name":"linux-pci","list_id":"linux-pci.vger.kernel.org","list_email":"linux-pci@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20260413210608.2912-5-alifm@linux.ibm.com>","date":"2026-04-13T21:06:05","name":"[v13,4/7] s390/pci: Store PCI error information for passthrough devices","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"c763e83f6caf34abddd2e9a659c3a0b70532901e","submitter":{"id":73785,"url":"http://patchwork.ozlabs.org/api/1.1/people/73785/?format=json","name":"Farhan Ali","email":"alifm@linux.ibm.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260413210608.2912-5-alifm@linux.ibm.com/mbox/","series":[{"id":499754,"url":"http://patchwork.ozlabs.org/api/1.1/series/499754/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/list/?series=499754","date":"2026-04-13T21:06:01","name":"Error recovery for vfio-pci devices on s390x","version":13,"mbox":"http://patchwork.ozlabs.org/series/499754/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2222861/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2222861/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=lqfemZ0W;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; 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c=relaxed/relaxed; d=ibm.com; h=cc\n\t:content-transfer-encoding:date:from:in-reply-to:message-id\n\t:mime-version:references:subject:to; s=pp1; bh=RPvGE9yDgHIntjRx9\n\trPf5CLfrprpavTVIkBl/uokYL8=; b=lqfemZ0WvAvXV91CfXGR7ja0eiGVfyl8q\n\tjK4UFIYzN8ENyE3Xhso+Fz5CwbBBJyl7TeqlaZawjm2fv8wVgS2JVsp/DmaEzVqt\n\tlo6CQDItfwib7UcNDcwKmLLksb3wq+mf0kk5zyr7IOKiEa6U6lP3D25llHmLTyO2\n\tPS8puFaFpL9ACM4v3nE0ya27Kpg45d8js5ft4mu4eEb/C83kkC3VVUMnOyfoRUri\n\tI2UUpXstv1ONtkBHqcR9HAZ0zsOsGGhRN3IWQO1lzoHS/NanXKFWkX9nkZmlFmZk\n\tvIO4NpDwHSY4mxMN0efEB5BKBigSrkV1RdctqOYVp0Ha3Q448QfJg==","From":"Farhan Ali ","To":"linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,\n linux-pci@vger.kernel.org","Cc":"helgaas@kernel.org, lukas@wunner.de, alex@shazbot.org, clg@redhat.com,\n kbusch@kernel.org, alifm@linux.ibm.com, schnelle@linux.ibm.com,\n mjrosato@linux.ibm.com","Subject":"[PATCH v13 4/7] s390/pci: Store PCI error information for passthrough\n devices","Date":"Mon, 13 Apr 2026 14:06:05 -0700","Message-ID":"<20260413210608.2912-5-alifm@linux.ibm.com>","X-Mailer":"git-send-email 2.43.0","In-Reply-To":"<20260413210608.2912-1-alifm@linux.ibm.com>","References":"<20260413210608.2912-1-alifm@linux.ibm.com>","Precedence":"bulk","X-Mailing-List":"linux-pci@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-TM-AS-GCONF":"00","X-Proofpoint-ORIG-GUID":"e9urMqbnrvezVea886TbRzQCt2l4_Dsr","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDEzMDIwNSBTYWx0ZWRfX52mx2jSmPZd7\n q7QtnDzIXGdRsLjgx3qxnJCNTHzOcDlqNU2X20A2Zpw5SiDxGaWi528d2XjqBeFQamgrShuxaRg\n UaAXr8CPg4lk5QISFBYcu32jrhWnU7qOKLD214zlQRkif//1XHpQVebbaJuRx6Als5NQXIu3v0D\n lb6yT0t/xaq2uHAdmiyXDRprGgsqUqZnGiAvAHTGn9I+426N9FR1or9GYqIP6ZYKV06Yll5Ma0M\n JLXlXT5z8W3pHLxX6x4gQQSoOyOP11d8JfFcO8VaLPH+p3RBCPN9ViqoPjVosb1eOOC7oWSCVN2\n dM9h/IbsPmlEuEob/cXR/0YyyOo68MYb2gBMxWuxPoWuEtqsPlXzAHYT0tB0+uo4cI2pWMr3dlm\n pB09IBTu6iDqcQg14yHkr3J9M+6m3t7IwPYjyRWLamY5/++gXgPD1HG9QyTy4IWeZA/PmSkjgv6\n xcjKS6kXix6K4e8rGEQ==","X-Proofpoint-GUID":"e9urMqbnrvezVea886TbRzQCt2l4_Dsr","X-Authority-Analysis":"v=2.4 cv=WpEb99fv c=1 sm=1 tr=0 ts=69dd5aca cx=c_pps\n a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17\n a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=PQMJTAmWB74Go-Ie6_gA:9","X-Proofpoint-Virus-Version":"vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-13_03,2026-04-13_04,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n priorityscore=1501 phishscore=0 bulkscore=0 adultscore=0 spamscore=0\n malwarescore=0 clxscore=1015 lowpriorityscore=0 suspectscore=0\n impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc=\n route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000\n definitions=main-2604130205"},"content":"For a passthrough device we need co-operation from user space to recover\nthe device. This would require to bubble up any error information to user\nspace. Let's store this error information for passthrough devices, so it\ncan be retrieved later.\n\nWe can now have userspace drivers (vfio-pci based) on s390x. The userspace\ndrivers will not have any KVM fd and so no kzdev associated with them. So\nwe need to update the logic for detecting passthrough devices to not depend\non struct kvm_zdev.\n\nReviewed-by: Matthew Rosato \nSigned-off-by: Farhan Ali \n---\n arch/s390/include/asm/pci.h | 30 ++++++++\n arch/s390/pci/pci.c | 1 +\n arch/s390/pci/pci_event.c | 117 +++++++++++++++++--------------\n drivers/vfio/pci/vfio_pci_zdev.c | 9 ++-\n 4 files changed, 105 insertions(+), 52 deletions(-)","diff":"diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h\nindex c0ff19dab580..9a6a4eb9d7c1 100644\n--- a/arch/s390/include/asm/pci.h\n+++ b/arch/s390/include/asm/pci.h\n@@ -118,6 +118,32 @@ struct zpci_bus {\n \tenum pci_bus_speed\tmax_bus_speed;\n };\n \n+/* Content Code Description for PCI Function Error */\n+struct zpci_ccdf_err {\n+\tu32 reserved1;\n+\tu32 fh; /* function handle */\n+\tu32 fid; /* function id */\n+\tu32 ett : 4; /* expected table type */\n+\tu32 mvn : 12; /* MSI vector number */\n+\tu32 dmaas : 8; /* DMA address space */\n+\tu32 reserved2 : 6;\n+\tu32 q : 1; /* event qualifier */\n+\tu32 rw : 1; /* read/write */\n+\tu64 faddr; /* failing address */\n+\tu32 reserved3;\n+\tu16 reserved4;\n+\tu16 pec; /* PCI event code */\n+} __packed;\n+\n+#define ZPCI_ERR_PENDING_MAX 4\n+struct zpci_ccdf_pending {\n+\tbool mediated_recovery;\n+\tu8 count;\n+\tu8 head;\n+\tu8 tail;\n+\tstruct zpci_ccdf_err err[ZPCI_ERR_PENDING_MAX];\n+};\n+\n /* Private data per function */\n struct zpci_dev {\n \tstruct zpci_bus *zbus;\n@@ -192,6 +218,8 @@ struct zpci_dev {\n \tstruct iommu_domain *s390_domain; /* attached IOMMU domain */\n \tstruct kvm_zdev *kzdev;\n \tstruct mutex kzdev_lock;\n+\tstruct zpci_ccdf_pending pending_errs;\n+\tstruct mutex pending_errs_lock;\n \tspinlock_t dom_lock;\t\t/* protect s390_domain change */\n };\n \n@@ -330,6 +358,8 @@ void zpci_debug_exit_device(struct zpci_dev *);\n int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);\n int zpci_clear_error_state(struct zpci_dev *zdev);\n int zpci_reset_load_store_blocked(struct zpci_dev *zdev);\n+void zpci_start_mediated_recovery(struct zpci_dev *zdev);\n+void zpci_stop_mediated_recovery(struct zpci_dev *zdev);\n \n #ifdef CONFIG_NUMA\n \ndiff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c\nindex 39bd2adfc240..2d377c2e194d 100644\n--- a/arch/s390/pci/pci.c\n+++ b/arch/s390/pci/pci.c\n@@ -842,6 +842,7 @@ struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state)\n \tmutex_init(&zdev->state_lock);\n \tmutex_init(&zdev->fmb_lock);\n \tmutex_init(&zdev->kzdev_lock);\n+\tmutex_init(&zdev->pending_errs_lock);\n \n \treturn zdev;\n \ndiff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c\nindex 839bd91c056e..c279a9f50a64 100644\n--- a/arch/s390/pci/pci_event.c\n+++ b/arch/s390/pci/pci_event.c\n@@ -17,23 +17,6 @@\n #include \"pci_bus.h\"\n #include \"pci_report.h\"\n \n-/* Content Code Description for PCI Function Error */\n-struct zpci_ccdf_err {\n-\tu32 reserved1;\n-\tu32 fh;\t\t\t\t/* function handle */\n-\tu32 fid;\t\t\t/* function id */\n-\tu32 ett\t\t: 4;\t\t/* expected table type */\n-\tu32 mvn\t\t: 12;\t\t/* MSI vector number */\n-\tu32 dmaas\t: 8;\t\t/* DMA address space */\n-\tu32\t\t: 6;\n-\tu32 q\t\t: 1;\t\t/* event qualifier */\n-\tu32 rw\t\t: 1;\t\t/* read/write */\n-\tu64 faddr;\t\t\t/* failing address */\n-\tu32 reserved3;\n-\tu16 reserved4;\n-\tu16 pec;\t\t\t/* PCI event code */\n-} __packed;\n-\n /* Content Code Description for PCI Function Availability */\n struct zpci_ccdf_avail {\n \tu32 reserved1;\n@@ -60,18 +43,6 @@ static inline bool ers_result_indicates_abort(pci_ers_result_t ers_res)\n \t}\n }\n \n-static bool is_passed_through(struct pci_dev *pdev)\n-{\n-\tstruct zpci_dev *zdev = to_zpci(pdev);\n-\tbool ret;\n-\n-\tmutex_lock(&zdev->kzdev_lock);\n-\tret = !!zdev->kzdev;\n-\tmutex_unlock(&zdev->kzdev_lock);\n-\n-\treturn ret;\n-}\n-\n static bool is_driver_supported(struct pci_driver *driver)\n {\n \tif (!driver || !driver->err_handler)\n@@ -81,6 +52,50 @@ static bool is_driver_supported(struct pci_driver *driver)\n \treturn true;\n }\n \n+static void zpci_store_pci_error(struct pci_dev *pdev,\n+\t\t\t\t struct zpci_ccdf_err *ccdf)\n+{\n+\tstruct zpci_dev *zdev = to_zpci(pdev);\n+\tint i;\n+\n+\tguard(mutex)(&zdev->pending_errs_lock);\n+\tif (!zdev->pending_errs.mediated_recovery)\n+\t\treturn;\n+\n+\tif (zdev->pending_errs.count >= ZPCI_ERR_PENDING_MAX) {\n+\t\tpr_err(\"%s: Maximum number (%d) of pending error events queued\",\n+\t\t pci_name(pdev), ZPCI_ERR_PENDING_MAX);\n+\t\treturn;\n+\t}\n+\n+\ti = zdev->pending_errs.tail % ZPCI_ERR_PENDING_MAX;\n+\tmemcpy(&zdev->pending_errs.err[i], ccdf, sizeof(struct zpci_ccdf_err));\n+\tzdev->pending_errs.tail++;\n+\tzdev->pending_errs.count++;\n+}\n+\n+void zpci_start_mediated_recovery(struct zpci_dev *zdev)\n+{\n+\tguard(mutex)(&zdev->pending_errs_lock);\n+\tzdev->pending_errs.mediated_recovery = true;\n+}\n+EXPORT_SYMBOL_GPL(zpci_start_mediated_recovery);\n+\n+void zpci_stop_mediated_recovery(struct zpci_dev *zdev)\n+{\n+\tstruct pci_dev *pdev = NULL;\n+\n+\tguard(mutex)(&zdev->pending_errs_lock);\n+\tzdev->pending_errs.mediated_recovery = false;\n+\tpdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);\n+\tif (zdev->pending_errs.count)\n+\t\tpr_info(\"%s: Unhandled PCI error events count=%d\",\n+\t\t\tpci_name(pdev), zdev->pending_errs.count);\n+\tmemset(&zdev->pending_errs, 0, sizeof(struct zpci_ccdf_pending));\n+\tpci_dev_put(pdev);\n+}\n+EXPORT_SYMBOL_GPL(zpci_stop_mediated_recovery);\n+\n static pci_ers_result_t zpci_event_notify_error_detected(struct pci_dev *pdev,\n \t\t\t\t\t\t\t struct pci_driver *driver)\n {\n@@ -175,7 +190,8 @@ static pci_ers_result_t zpci_event_do_reset(struct pci_dev *pdev,\n * and the platform determines which functions are affected for\n * multi-function devices.\n */\n-static pci_ers_result_t zpci_event_attempt_error_recovery(struct pci_dev *pdev)\n+static pci_ers_result_t zpci_event_attempt_error_recovery(struct pci_dev *pdev,\n+\t\t\t\t\t\t\t struct zpci_ccdf_err *ccdf)\n {\n \tpci_ers_result_t ers_res = PCI_ERS_RESULT_DISCONNECT;\n \tstruct zpci_dev *zdev = to_zpci(pdev);\n@@ -194,13 +210,6 @@ static pci_ers_result_t zpci_event_attempt_error_recovery(struct pci_dev *pdev)\n \t}\n \tpdev->error_state = pci_channel_io_frozen;\n \n-\tif (is_passed_through(pdev)) {\n-\t\tpr_info(\"%s: Cannot be recovered in the host because it is a pass-through device\\n\",\n-\t\t\tpci_name(pdev));\n-\t\tstatus_str = \"failed (pass-through)\";\n-\t\tgoto out_unlock;\n-\t}\n-\n \tdriver = to_pci_driver(pdev->dev.driver);\n \tif (!is_driver_supported(driver)) {\n \t\tif (!driver) {\n@@ -216,12 +225,24 @@ static pci_ers_result_t zpci_event_attempt_error_recovery(struct pci_dev *pdev)\n \t\tgoto out_unlock;\n \t}\n \n+\tzpci_store_pci_error(pdev, ccdf);\n+\n \ters_res = zpci_event_notify_error_detected(pdev, driver);\n \tif (ers_result_indicates_abort(ers_res)) {\n \t\tstatus_str = \"failed (abort on detection)\";\n \t\tgoto out_unlock;\n \t}\n \n+\tscoped_guard(mutex, &zdev->pending_errs_lock) {\n+\t\tif (zdev->pending_errs.mediated_recovery) {\n+\t\t\tpr_info(\"%s: Leaving recovery of pass-through device to user-space\\n\",\n+\t\t\t\tpci_name(pdev));\n+\t\t\ters_res = PCI_ERS_RESULT_RECOVERED;\n+\t\t\tstatus_str = \"in progress\";\n+\t\t\tgoto out_unlock;\n+\t\t}\n+\t}\n+\n \tif (ers_res != PCI_ERS_RESULT_NEED_RESET) {\n \t\ters_res = zpci_event_do_error_state_clear(pdev, driver);\n \t\tif (ers_result_indicates_abort(ers_res)) {\n@@ -266,25 +287,19 @@ static pci_ers_result_t zpci_event_attempt_error_recovery(struct pci_dev *pdev)\n * @pdev: PCI function for which to report\n * @es: PCI channel failure state to report\n */\n-static void zpci_event_io_failure(struct pci_dev *pdev, pci_channel_state_t es)\n+static void zpci_event_io_failure(struct pci_dev *pdev, pci_channel_state_t es,\n+\t\t\t\t struct zpci_ccdf_err *ccdf)\n {\n \tstruct pci_driver *driver;\n \n \tpci_dev_lock(pdev);\n \tpdev->error_state = es;\n-\t/**\n-\t * While vfio-pci's error_detected callback notifies user-space QEMU\n-\t * reacts to this by freezing the guest. In an s390 environment PCI\n-\t * errors are rarely fatal so this is overkill. Instead in the future\n-\t * we will inject the error event and let the guest recover the device\n-\t * itself.\n-\t */\n-\tif (is_passed_through(pdev))\n-\t\tgoto out;\n+\n+\tzpci_store_pci_error(pdev, ccdf);\n \tdriver = to_pci_driver(pdev->dev.driver);\n \tif (driver && driver->err_handler && driver->err_handler->error_detected)\n \t\tdriver->err_handler->error_detected(pdev, pdev->error_state);\n-out:\n+\n \tpci_dev_unlock(pdev);\n }\n \n@@ -330,12 +345,12 @@ static void __zpci_event_error(struct zpci_ccdf_err *ccdf)\n \t\tbreak;\n \tcase 0x0040: /* Service Action or Error Recovery Failed */\n \tcase 0x003b:\n-\t\tzpci_event_io_failure(pdev, pci_channel_io_perm_failure);\n+\t\tzpci_event_io_failure(pdev, pci_channel_io_perm_failure, ccdf);\n \t\tbreak;\n \tdefault: /* PCI function left in the error state attempt to recover */\n-\t\ters_res = zpci_event_attempt_error_recovery(pdev);\n+\t\ters_res = zpci_event_attempt_error_recovery(pdev, ccdf);\n \t\tif (ers_res != PCI_ERS_RESULT_RECOVERED)\n-\t\t\tzpci_event_io_failure(pdev, pci_channel_io_perm_failure);\n+\t\t\tzpci_event_io_failure(pdev, pci_channel_io_perm_failure, ccdf);\n \t\tbreak;\n \t}\n \tpci_dev_put(pdev);\ndiff --git a/drivers/vfio/pci/vfio_pci_zdev.c b/drivers/vfio/pci/vfio_pci_zdev.c\nindex 0990fdb146b7..0658095ac5b1 100644\n--- a/drivers/vfio/pci/vfio_pci_zdev.c\n+++ b/drivers/vfio/pci/vfio_pci_zdev.c\n@@ -148,6 +148,8 @@ int vfio_pci_zdev_open_device(struct vfio_pci_core_device *vdev)\n \tif (!zdev)\n \t\treturn -ENODEV;\n \n+\tzpci_start_mediated_recovery(zdev);\n+\n \tif (!vdev->vdev.kvm)\n \t\treturn 0;\n \n@@ -161,7 +163,12 @@ void vfio_pci_zdev_close_device(struct vfio_pci_core_device *vdev)\n {\n \tstruct zpci_dev *zdev = to_zpci(vdev->pdev);\n \n-\tif (!zdev || !vdev->vdev.kvm)\n+\tif (!zdev)\n+\t\treturn;\n+\n+\tzpci_stop_mediated_recovery(zdev);\n+\n+\tif (!vdev->vdev.kvm)\n \t\treturn;\n \n \tif (zpci_kvm_hook.kvm_unregister)\n","prefixes":["v13","4/7"]}