[PATCH v2 25/26] drm/xe/pf: Export helpers for VFIO

["Michał Winiarski" <michal.winiarski@intel.com>]

Vendor-specific VFIO driver for Xe will implement VF migration.
Export everything that's needed for migration ops.

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
---
 drivers/gpu/drm/xe/Makefile        |   2 +
 drivers/gpu/drm/xe/xe_sriov_vfio.c | 296 +++++++++++++++++++++++++++++
 include/drm/intel/xe_sriov_vfio.h  |  28 +++
 3 files changed, 326 insertions(+)
 create mode 100644 drivers/gpu/drm/xe/xe_sriov_vfio.c
 create mode 100644 include/drm/intel/xe_sriov_vfio.h

diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 3d72db9e528e4..de3778f51ce7e 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -182,6 +182,8 @@ xe-$(CONFIG_PCI_IOV) += \
 	xe_sriov_pf_service.o \
 	xe_tile_sriov_pf_debugfs.o
 
+xe-$(CONFIG_XE_VFIO_PCI) += xe_sriov_vfio.o
+
 # include helpers for tests even when XE is built-in
 ifdef CONFIG_DRM_XE_KUNIT_TEST
 xe-y += tests/xe_kunit_helpers.o
diff --git a/drivers/gpu/drm/xe/xe_sriov_vfio.c b/drivers/gpu/drm/xe/xe_sriov_vfio.c
new file mode 100644
index 0000000000000..4f2a7c2b5d61c
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_sriov_vfio.c
@@ -0,0 +1,296 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+#include <drm/intel/xe_sriov_vfio.h>
+
+#include "xe_pm.h"
+#include "xe_sriov.h"
+#include "xe_sriov_migration_data.h"
+#include "xe_sriov_pf_control.h"
+#include "xe_sriov_pf_helpers.h"
+#include "xe_sriov_pf_migration.h"
+#include "xe_sriov_types.h"
+
+/**
+ * xe_sriov_vfio_migration_supported() - Check if migration is supported.
+ * @pdev: the PF &pci_dev device
+ *
+ * Return: true if migration is supported, false otherwise.
+ */
+bool xe_sriov_vfio_migration_supported(struct pci_dev *pdev)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	return xe_sriov_pf_migration_supported(xe);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_migration_supported, "xe-vfio-pci");
+
+/**
+ * xe_sriov_vfio_wait_flr_done() - Wait for VF FLR completion.
+ * @pdev: the PF &pci_dev device
+ * @vfid: the VF identifier (can't be 0)
+ *
+ * This function will wait until VF FLR is processed by PF on all tiles (or
+ * until timeout occurs).
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_vfio_wait_flr_done(struct pci_dev *pdev, unsigned int vfid)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	if (vfid == PFID || vfid > xe_sriov_pf_get_totalvfs(xe))
+		return -EINVAL;
+
+	xe_assert(xe, !xe_pm_runtime_suspended(xe));
+
+	return xe_sriov_pf_control_wait_flr(xe, vfid);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_wait_flr_done, "xe-vfio-pci");
+
+/**
+ * xe_sriov_vfio_stop() - Stop VF.
+ * @pdev: the PF &pci_dev device
+ * @vfid: the VF identifier (can't be 0)
+ *
+ * This function will pause VF on all tiles/GTs.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_vfio_stop(struct pci_dev *pdev, unsigned int vfid)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	if (vfid == PFID || vfid > xe_sriov_pf_get_totalvfs(xe))
+		return -EINVAL;
+
+	xe_assert(xe, !xe_pm_runtime_suspended(xe));
+
+	return xe_sriov_pf_control_pause_vf(xe, vfid);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_stop, "xe-vfio-pci");
+
+/**
+ * xe_sriov_vfio_run() - Run VF.
+ * @pdev: the PF &pci_dev device
+ * @vfid: the VF identifier (can't be 0)
+ *
+ * This function will resume VF on all tiles.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_vfio_run(struct pci_dev *pdev, unsigned int vfid)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	if (vfid == PFID || vfid > xe_sriov_pf_get_totalvfs(xe))
+		return -EINVAL;
+
+	xe_assert(xe, !xe_pm_runtime_suspended(xe));
+
+	return xe_sriov_pf_control_resume_vf(xe, vfid);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_run, "xe-vfio-pci");
+
+/**
+ * xe_sriov_vfio_stop_copy_enter() - Initiate a VF device migration data save.
+ * @pdev: the PF &pci_dev device
+ * @vfid: the VF identifier (can't be 0)
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_vfio_stop_copy_enter(struct pci_dev *pdev, unsigned int vfid)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	if (vfid == PFID || vfid > xe_sriov_pf_get_totalvfs(xe))
+		return -EINVAL;
+
+	xe_assert(xe, !xe_pm_runtime_suspended(xe));
+
+	return xe_sriov_pf_control_trigger_save_vf(xe, vfid);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_stop_copy_enter, "xe-vfio-pci");
+
+/**
+ * xe_sriov_vfio_stop_copy_exit() - Finish a VF device migration data save.
+ * @pdev: the PF &pci_dev device
+ * @vfid: the VF identifier (can't be 0)
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_vfio_stop_copy_exit(struct pci_dev *pdev, unsigned int vfid)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	if (vfid == PFID || vfid > xe_sriov_pf_get_totalvfs(xe))
+		return -EINVAL;
+
+	xe_assert(xe, !xe_pm_runtime_suspended(xe));
+
+	return xe_sriov_pf_control_finish_save_vf(xe, vfid);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_stop_copy_exit, "xe-vfio-pci");
+
+/**
+ * xe_sriov_vfio_resume_enter() - Initiate a VF device migration data restore.
+ * @pdev: the PF &pci_dev device
+ * @vfid: the VF identifier (can't be 0)
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_vfio_resume_enter(struct pci_dev *pdev, unsigned int vfid)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	if (vfid == PFID || vfid > xe_sriov_pf_get_totalvfs(xe))
+		return -EINVAL;
+
+	xe_assert(xe, !xe_pm_runtime_suspended(xe));
+
+	return xe_sriov_pf_control_trigger_restore_vf(xe, vfid);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_resume_enter, "xe-vfio-pci");
+
+/**
+ * xe_sriov_vfio_resume_exit() - Finish a VF device migration data restore.
+ * @pdev: the PF &pci_dev device
+ * @vfid: the VF identifier (can't be 0)
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_vfio_resume_exit(struct pci_dev *pdev, unsigned int vfid)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	if (vfid == PFID || vfid > xe_sriov_pf_get_totalvfs(xe))
+		return -EINVAL;
+
+	xe_assert(xe, !xe_pm_runtime_suspended(xe));
+
+	return xe_sriov_pf_control_finish_restore_vf(xe, vfid);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_resume_exit, "xe-vfio-pci");
+
+/**
+ * xe_sriov_vfio_error() - Move VF device to error state.
+ * @pdev: the PF &pci_dev device
+ * @vfid: the VF identifier (can't be 0)
+ *
+ * Reset is needed to move it out of error state.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_vfio_error(struct pci_dev *pdev, unsigned int vfid)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	if (vfid == PFID || vfid > xe_sriov_pf_get_totalvfs(xe))
+		return -EINVAL;
+
+	xe_assert(xe, !xe_pm_runtime_suspended(xe));
+
+	return xe_sriov_pf_control_stop_vf(xe, vfid);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_error, "xe-vfio-pci");
+
+/**
+ * xe_sriov_vfio_data_read() - Read migration data from the VF device.
+ * @pdev: the PF &pci_dev device
+ * @vfid: the VF identifier (can't be 0)
+ * @buf: start address of userspace buffer
+ * @len: requested read size from userspace
+ *
+ * Return: number of bytes that has been successfully read,
+ *	   0 if no more migration data is available, -errno on failure.
+ */
+ssize_t xe_sriov_vfio_data_read(struct pci_dev *pdev, unsigned int vfid,
+				char __user *buf, size_t len)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	if (vfid == PFID || vfid > xe_sriov_pf_get_totalvfs(xe))
+		return -EINVAL;
+
+	return xe_sriov_migration_data_read(xe, vfid, buf, len);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_data_read, "xe-vfio-pci");
+
+/**
+ * xe_sriov_vfio_data_write() - Write migration data to the VF device.
+ * @pdev: the PF &pci_dev device
+ * @vfid: the VF identifier (can't be 0)
+ * @buf: start address of userspace buffer
+ * @len: requested write size from userspace
+ *
+ * Return: number of bytes that has been successfully written, -errno on failure.
+ */
+ssize_t xe_sriov_vfio_data_write(struct pci_dev *pdev, unsigned int vfid,
+				 const char __user *buf, size_t len)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	if (vfid == PFID || vfid > xe_sriov_pf_get_totalvfs(xe))
+		return -EINVAL;
+
+	return xe_sriov_migration_data_write(xe, vfid, buf, len);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_data_write, "xe-vfio-pci");
+
+/**
+ * xe_sriov_vfio_stop_copy_size() - Get a size estimate of VF device migration data.
+ * @pdev: the PF &pci_dev device
+ * @vfid: the VF identifier (can't be 0)
+ *
+ * Return: migration data size in bytes or a negative error code on failure.
+ */
+ssize_t xe_sriov_vfio_stop_copy_size(struct pci_dev *pdev, unsigned int vfid)
+{
+	struct xe_device *xe = pci_get_drvdata(pdev);
+
+	if (!IS_SRIOV_PF(xe))
+		return -ENODEV;
+
+	if (vfid == PFID || vfid > xe_sriov_pf_get_totalvfs(xe))
+		return -EINVAL;
+
+	xe_assert(xe, !xe_pm_runtime_suspended(xe));
+
+	return xe_sriov_pf_migration_size(xe, vfid);
+}
+EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_stop_copy_size, "xe-vfio-pci");
diff --git a/include/drm/intel/xe_sriov_vfio.h b/include/drm/intel/xe_sriov_vfio.h
new file mode 100644
index 0000000000000..cf4ef7a1cfbbe
--- /dev/null
+++ b/include/drm/intel/xe_sriov_vfio.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+#ifndef _XE_SRIOV_VFIO_H_
+#define _XE_SRIOV_VFIO_H_
+
+#include <linux/types.h>
+
+struct pci_dev;
+
+bool xe_sriov_vfio_migration_supported(struct pci_dev *pdev);
+int xe_sriov_vfio_wait_flr_done(struct pci_dev *pdev, unsigned int vfid);
+int xe_sriov_vfio_stop(struct pci_dev *pdev, unsigned int vfid);
+int xe_sriov_vfio_run(struct pci_dev *pdev, unsigned int vfid);
+int xe_sriov_vfio_stop_copy_enter(struct pci_dev *pdev, unsigned int vfid);
+int xe_sriov_vfio_stop_copy_exit(struct pci_dev *pdev, unsigned int vfid);
+int xe_sriov_vfio_resume_enter(struct pci_dev *pdev, unsigned int vfid);
+int xe_sriov_vfio_resume_exit(struct pci_dev *pdev, unsigned int vfid);
+int xe_sriov_vfio_error(struct pci_dev *pdev, unsigned int vfid);
+ssize_t xe_sriov_vfio_data_read(struct pci_dev *pdev, unsigned int vfid,
+				char __user *buf, size_t len);
+ssize_t xe_sriov_vfio_data_write(struct pci_dev *pdev, unsigned int vfid,
+				 const char __user *buf, size_t len);
+ssize_t xe_sriov_vfio_stop_copy_size(struct pci_dev *pdev, unsigned int vfid);
+
+#endif
-- 
2.50.1