On 22-04-2024 12:27, Aravind Iddamsetty wrote:
PCI subsystem provides callbacks to inform the driver about a request to
do function level reset by user, initiated by writing to sysfs entry
/sys/bus/pci/devices/.../reset. This will allow the driver to handle FLR
without the need to do unbind and rebind as the driver needs to
reinitialize the device afresh post FLR.
v2:
1. separate out gt idle and pci save/restore to a separate patch (Lucas)
2. Fixed the warnings seen around xe_guc_submit_stop, xe_guc_puc_fini
v3: declare xe_pci_err_handlers as static(Michal)
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Cc: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/xe/Makefile | 1 +
drivers/gpu/drm/xe/xe_device_types.h | 3 +
drivers/gpu/drm/xe/xe_guc_pc.c | 4 ++
drivers/gpu/drm/xe/xe_pci.c | 9 ++-
drivers/gpu/drm/xe/xe_pci.h | 2 +
drivers/gpu/drm/xe/xe_pci_err.c | 88 ++++++++++++++++++++++++++++
drivers/gpu/drm/xe/xe_pci_err.h | 13 ++++
7 files changed, 119 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/xe/xe_pci_err.c
create mode 100644 drivers/gpu/drm/xe/xe_pci_err.h
diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 8bc62bfbc679..693971a1fac0 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -117,6 +117,7 @@ xe-y += xe_bb.o \
xe_module.o \
xe_pat.o \
xe_pci.o \
+ xe_pci_err.o \
xe_pcode.o \
xe_pm.o \
xe_preempt_fence.o \
diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index 0a66555229e9..8c749b378a92 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -465,6 +465,9 @@ struct xe_device {
/** @pci_state: PCI state of device */
struct pci_saved_state *pci_state;
+ /** @pci_device_is_reset: device went through PCIe FLR */
+ bool pci_device_is_reset;
+
/* private: */
#if IS_ENABLED(CONFIG_DRM_XE_DISPLAY)
diff --git a/drivers/gpu/drm/xe/xe_guc_pc.c b/drivers/gpu/drm/xe/xe_guc_pc.c
index 509649d0e65e..efba0fbe2f5c 100644
--- a/drivers/gpu/drm/xe/xe_guc_pc.c
+++ b/drivers/gpu/drm/xe/xe_guc_pc.c
@@ -902,6 +902,10 @@ static void xe_guc_pc_fini(struct drm_device *drm, void *arg)
return;
}
+ /* We already have done this before going through a reset, so skip here */
+ if (xe->pci_device_is_reset)
+ return;
+
XE_WARN_ON(xe_force_wake_get(gt_to_fw(pc_to_gt(pc)), XE_FORCEWAKE_ALL));
XE_WARN_ON(xe_guc_pc_gucrc_disable(pc));
XE_WARN_ON(xe_guc_pc_stop(pc));
diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c
index a62300990e19..b5a582afc9e7 100644
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -23,6 +23,7 @@
#include "xe_macros.h"
#include "xe_mmio.h"
#include "xe_module.h"
+#include "xe_pci_err.h"
#include "xe_pci_types.h"
#include "xe_pm.h"
#include "xe_sriov.h"
@@ -738,7 +739,7 @@ static void xe_pci_remove(struct pci_dev *pdev)
pci_set_drvdata(pdev, NULL);
}
-static int xe_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+int xe_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
const struct xe_device_desc *desc = (const void *)ent->driver_data;
const struct xe_subplatform_desc *subplatform_desc;
@@ -986,6 +987,11 @@ static const struct dev_pm_ops xe_pm_ops = {
};
#endif
+static const struct pci_error_handlers xe_pci_err_handlers = {
+ .reset_prepare = xe_pci_reset_prepare,
+ .reset_done = xe_pci_reset_done,
+};
+
static struct pci_driver xe_pci_driver = {
.name = DRIVER_NAME,
.id_table = pciidlist,
@@ -995,6 +1001,7 @@ static struct pci_driver xe_pci_driver = {
#ifdef CONFIG_PM_SLEEP
.driver.pm = &xe_pm_ops,
#endif
+ .err_handler = &xe_pci_err_handlers,
};
int xe_register_pci_driver(void)
diff --git a/drivers/gpu/drm/xe/xe_pci.h b/drivers/gpu/drm/xe/xe_pci.h
index 73b90a430d1f..9faf5380a09e 100644
--- a/drivers/gpu/drm/xe/xe_pci.h
+++ b/drivers/gpu/drm/xe/xe_pci.h
@@ -7,8 +7,10 @@
#define _XE_PCI_H_
struct pci_dev;
+struct pci_device_id;
int xe_register_pci_driver(void);
void xe_unregister_pci_driver(void);
void xe_load_pci_state(struct pci_dev *pdev);
+int xe_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
#endif
diff --git a/drivers/gpu/drm/xe/xe_pci_err.c b/drivers/gpu/drm/xe/xe_pci_err.c
new file mode 100644
index 000000000000..5306925ea2fa
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_pci_err.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#include <linux/pci.h>
+#include <drm/drm_drv.h>
+
+#include "xe_device.h"
+#include "xe_gt.h"
+#include "xe_gt_printk.h"
+#include "xe_pci.h"
+#include "xe_pci_err.h"
+#include "xe_pm.h"
+#include "xe_uc.h"
+
+/**
+ * xe_pci_reset_prepare - Called when user issued a PCIe reset
+ * via /sys/bus/pci/devices/.../reset.
+ * @pdev: PCI device struct
+ */
+void xe_pci_reset_prepare(struct pci_dev *pdev)
+{
+ struct xe_device *xe = pci_get_drvdata(pdev);
+ struct xe_gt *gt;
+ int id, err;
+
+ pci_warn(pdev, "preparing for PCIe reset\n");
+
+ drm_warn(&xe->drm, "removing device access to userspace\n");
+ drm_dev_unplug(&xe->drm);
+
+ xe_pm_runtime_get(xe);
+ /* idle the GTs */
+ for_each_gt(gt, xe, id) {
+ err = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
+ if (err)
+ goto reset;
+ xe_uc_reset_prepare(>->uc);
+ xe_gt_idle(gt);
+ err = xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL);
+ XE_WARN_ON(err);
+ }
+ xe_pm_runtime_put(xe);
Is xe_save_pci_state() needed here?
Regards,
Badal Nilawar> +
+reset:
+ pci_disable_device(pdev);
+}
+
+/**
+ * xe_pci_reset_done - Called when PCIe reset is done.
+ * @pdev: PCI device struct
+ */
+void xe_pci_reset_done(struct pci_dev *pdev)
+{
+ const struct pci_device_id *ent = pci_match_id(pdev->driver->id_table, pdev);
+ struct xe_device *xe = pci_get_drvdata(pdev);
+
+ dev_info(&pdev->dev,
+ "device went through PCIe reset, reenabling the device\n");
+
+ if (pci_enable_device(pdev)) {
+ dev_err(&pdev->dev,
+ "Cannot re-enable PCI device after reset\n");
+ return;
+ }
+ pci_set_master(pdev);
+ xe_load_pci_state(pdev);
+
+ xe->pci_device_is_reset = true;
+ /*
+ * We want to completely clean the driver and even destroy
+ * the xe private data and reinitialize afresh similar to
+ * probe
+ */
+ pdev->driver->remove(pdev);
+ if (pci_dev_msi_enabled(pdev))
+ pci_free_irq_vectors(pdev);
+
+ devm_drm_dev_release_action(&xe->drm);
+ pci_disable_device(pdev);
+
+ /*
+ * if this fails the driver might be in a stale state, only option is
+ * to unbind and rebind
+ */
+ xe_pci_probe(pdev, ent);
+}
diff --git a/drivers/gpu/drm/xe/xe_pci_err.h b/drivers/gpu/drm/xe/xe_pci_err.h
new file mode 100644
index 000000000000..95a4c8ce9cf1
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_pci_err.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#ifndef _XE_PCI_ERR_H_
+#define _XE_PCI_ERR_H_
+
+struct pci_dev;
+
+void xe_pci_reset_prepare(struct pci_dev *pdev);
+void xe_pci_reset_done(struct pci_dev *pdev);
+#endif
