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Date: Wed, 5 Aug 2020 15:49:38 +0300
From: Oded Gabbay <oded.gabbay@...il.com>
To: linux-kernel@...r.kernel.org, SW_Drivers@...ana.ai
Cc: Ofir Bitton <obitton@...ana.ai>
Subject: [PATCH 1/2] habanalabs: PCIe Advanced Error Reporting support
From: Ofir Bitton <obitton@...ana.ai>
driver will now get notified upon any PCI error occurred and
will respond according to the severity of the error.
Signed-off-by: Ofir Bitton <obitton@...ana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
---
.../misc/habanalabs/common/habanalabs_drv.c | 76 ++++++++++++++++++-
1 file changed, 75 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/habanalabs/common/habanalabs_drv.c b/drivers/misc/habanalabs/common/habanalabs_drv.c
index c6b31e93fb5e..a36e33c58d37 100644
--- a/drivers/misc/habanalabs/common/habanalabs_drv.c
+++ b/drivers/misc/habanalabs/common/habanalabs_drv.c
@@ -11,6 +11,7 @@
#include "habanalabs.h"
#include <linux/pci.h>
+#include <linux/aer.h>
#include <linux/module.h>
#define HL_DRIVER_AUTHOR "HabanaLabs Kernel Driver Team"
@@ -408,6 +409,8 @@ static int hl_pci_probe(struct pci_dev *pdev,
pci_set_drvdata(pdev, hdev);
+ pci_enable_pcie_error_reporting(pdev);
+
rc = hl_device_init(hdev, hl_class);
if (rc) {
dev_err(&pdev->dev, "Fatal error during habanalabs device init\n");
@@ -440,22 +443,93 @@ static void hl_pci_remove(struct pci_dev *pdev)
return;
hl_device_fini(hdev);
+ pci_disable_pcie_error_reporting(pdev);
pci_set_drvdata(pdev, NULL);
-
destroy_hdev(hdev);
}
+/**
+ * hl_pci_err_detected - a PCI bus error detected on this device
+ *
+ * @pdev: pointer to pci device
+ * @err: PCI error type
+ *
+ * Called by the PCI subsystem whenever a non-correctable
+ * PCI bus error is detected
+ */
+static pci_ers_result_t
+hl_pci_err_detected(struct pci_dev *pdev, enum pci_channel_state state)
+{
+ struct hl_device *hdev = pci_get_drvdata(pdev);
+ enum pci_ers_result result;
+
+ switch (state) {
+ case pci_channel_io_normal:
+ return PCI_ERS_RESULT_CAN_RECOVER;
+
+ case pci_channel_io_frozen:
+ dev_warn(hdev->dev, "frozen state error detected\n");
+ result = PCI_ERS_RESULT_NEED_RESET;
+ break;
+
+ case pci_channel_io_perm_failure:
+ dev_warn(hdev->dev, "failure state error detected\n");
+ result = PCI_ERS_RESULT_DISCONNECT;
+ break;
+
+ default:
+ result = PCI_ERS_RESULT_NONE;
+ }
+
+ hdev->asic_funcs->halt_engines(hdev, true);
+
+ return result;
+}
+
+/**
+ * hl_pci_err_resume - resume after a PCI slot reset
+ *
+ * @pdev: pointer to pci device
+ *
+ */
+static void hl_pci_err_resume(struct pci_dev *pdev)
+{
+ struct hl_device *hdev = pci_get_drvdata(pdev);
+
+ dev_warn(hdev->dev, "Resuming device after PCI slot reset\n");
+ hl_device_resume(hdev);
+}
+
+/**
+ * hl_pci_err_slot_reset - a PCI slot reset has just happened
+ *
+ * @pdev: pointer to pci device
+ *
+ * Determine if the driver can recover from the PCI slot reset
+ */
+static pci_ers_result_t hl_pci_err_slot_reset(struct pci_dev *pdev)
+{
+ return PCI_ERS_RESULT_RECOVERED;
+}
+
static const struct dev_pm_ops hl_pm_ops = {
.suspend = hl_pmops_suspend,
.resume = hl_pmops_resume,
};
+static const struct pci_error_handlers hl_pci_err_handler = {
+ .error_detected = hl_pci_err_detected,
+ .slot_reset = hl_pci_err_slot_reset,
+ .resume = hl_pci_err_resume,
+};
+
static struct pci_driver hl_pci_driver = {
.name = HL_NAME,
.id_table = ids,
.probe = hl_pci_probe,
.remove = hl_pci_remove,
.driver.pm = &hl_pm_ops,
+ .err_handler = &hl_pci_err_handler,
};
/*
--
2.17.1
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