[PATCH 02/26] drm/xe: Move migration support to device-level struct

Michał Winiarski
2025-10-11T19:40:26Z

Upcoming changes will allow users to control VF state and obtain its
migration data with a device-level granularity (not tile/gt).
Change the data structures to reflect that and move the GT-level
migration init to happen after device-level init.

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
---
drivers/gpu/drm/xe/Makefile | 1 +
drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c | 12 +-----
.../drm/xe/xe_gt_sriov_pf_migration_types.h | 3 --
drivers/gpu/drm/xe/xe_sriov_pf.c | 5 +++
drivers/gpu/drm/xe/xe_sriov_pf_migration.c | 43 +++++++++++++++++++
drivers/gpu/drm/xe/xe_sriov_pf_migration.h | 27 ++++++++++++
.../gpu/drm/xe/xe_sriov_pf_migration_types.h | 0
drivers/gpu/drm/xe/xe_sriov_pf_types.h | 5 +++
8 files changed, 83 insertions(+), 13 deletions(-)
create mode 100644 drivers/gpu/drm/xe/xe_sriov_pf_migration.c
create mode 100644 drivers/gpu/drm/xe/xe_sriov_pf_migration.h
create mode 100644 drivers/gpu/drm/xe/xe_sriov_pf_migration_types.h

diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 84321fad32658..71f685a315dca 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -176,6 +176,7 @@ xe-$(CONFIG_PCI_IOV) += \
xe_sriov_pf.o \
xe_sriov_pf_control.o \
xe_sriov_pf_debugfs.o \
+ xe_sriov_pf_migration.o \
xe_sriov_pf_service.o \
xe_tile_sriov_pf_debugfs.o

diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c
index a5bf327ef8889..ca28f45aaf481 100644
--- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c
@@ -13,6 +13,7 @@
#include "xe_guc.h"
#include "xe_guc_ct.h"
#include "xe_sriov.h"
+#include "xe_sriov_pf_migration.h"

/* Return: number of dwords saved/restored/required or a negative error code on failure */
static int guc_action_vf_save_restore(struct xe_guc *guc, u32 vfid, u32 opcode,
@@ -115,8 +116,7 @@ static int pf_send_guc_restore_vf_state(struct xe_gt *gt, unsigned int vfid,

static bool pf_migration_supported(struct xe_gt *gt)
{
- xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt)));
- return gt->sriov.pf.migration.supported;
+ return xe_sriov_pf_migration_supported(gt_to_xe(gt));
}

static struct mutex *pf_migration_mutex(struct xe_gt *gt)
@@ -382,12 +382,6 @@ ssize_t xe_gt_sriov_pf_migration_write_guc_state(struct xe_gt *gt, unsigned int
}
#endif /* CONFIG_DEBUG_FS */

-static bool pf_check_migration_support(struct xe_gt *gt)
-{
- /* XXX: for now this is for feature enabling only */
- return IS_ENABLED(CONFIG_DRM_XE_DEBUG);
-}
-
/**
* xe_gt_sriov_pf_migration_init() - Initialize support for VF migration.
* @gt: the &xe_gt
@@ -403,8 +397,6 @@ int xe_gt_sriov_pf_migration_init(struct xe_gt *gt)

xe_gt_assert(gt, IS_SRIOV_PF(xe));

- gt->sriov.pf.migration.supported = pf_check_migration_support(gt);
-
if (!pf_migration_supported(gt))
return 0;

diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration_types.h b/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration_types.h
index 1f3110b6d44fa..9d672feac5f04 100644
--- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration_types.h
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration_types.h
@@ -30,9 +30,6 @@ struct xe_gt_sriov_state_snapshot {
* Used by the PF driver to maintain non-VF specific per-GT data.
*/
struct xe_gt_sriov_pf_migration {
- /** @supported: indicates whether the feature is supported */
- bool supported;
-
/** @snapshot_lock: protects all VFs snapshots */
struct mutex snapshot_lock;
};
diff --git a/drivers/gpu/drm/xe/xe_sriov_pf.c b/drivers/gpu/drm/xe/xe_sriov_pf.c
index bc1ab9ee31d92..95743c7af8050 100644
--- a/drivers/gpu/drm/xe/xe_sriov_pf.c
+++ b/drivers/gpu/drm/xe/xe_sriov_pf.c
@@ -15,6 +15,7 @@
#include "xe_sriov.h"
#include "xe_sriov_pf.h"
#include "xe_sriov_pf_helpers.h"
+#include "xe_sriov_pf_migration.h"
#include "xe_sriov_pf_service.h"
#include "xe_sriov_printk.h"

@@ -101,6 +102,10 @@ int xe_sriov_pf_init_early(struct xe_device *xe)
if (err)
return err;

+ err = xe_sriov_pf_migration_init(xe);
+ if (err)
+ return err;
+
xe_sriov_pf_service_init(xe);

return 0;
diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_migration.c b/drivers/gpu/drm/xe/xe_sriov_pf_migration.c
new file mode 100644
index 0000000000000..cf6a210d5597a
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_sriov_pf_migration.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+#include "xe_sriov.h"
+#include "xe_sriov_pf_migration.h"
+
+/**
+ * xe_sriov_pf_migration_supported() - Check if SR-IOV VF migration is supported by the device
+ * @xe: the &struct xe_device
+ *
+ * Return: true if migration is supported, false otherwise
+ */
+bool xe_sriov_pf_migration_supported(struct xe_device *xe)
+{
+ xe_assert(xe, IS_SRIOV_PF(xe));
+
+ return xe->sriov.pf.migration.supported;
+}
+
+static bool pf_check_migration_support(struct xe_device *xe)
+{
+ xe_assert(xe, IS_SRIOV_PF(xe));
+
+ /* XXX: for now this is for feature enabling only */
+ return IS_ENABLED(CONFIG_DRM_XE_DEBUG);
+}
+
+/**
+ * xe_sriov_pf_migration_init() - Initialize support for SR-IOV VF migration.
+ * @xe: the &struct xe_device
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_sriov_pf_migration_init(struct xe_device *xe)
+{
+ xe_assert(xe, IS_SRIOV_PF(xe));
+
+ xe->sriov.pf.migration.supported = pf_check_migration_support(xe);
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_migration.h b/drivers/gpu/drm/xe/xe_sriov_pf_migration.h
new file mode 100644
index 0000000000000..d3058b6682192
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_sriov_pf_migration.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+#ifndef _XE_SRIOV_PF_MIGRATION_H_
+#define _XE_SRIOV_PF_MIGRATION_H_
+
+#include <linux/types.h>
+
+struct xe_device;
+
+#ifdef CONFIG_PCI_IOV
+int xe_sriov_pf_migration_init(struct xe_device *xe);
+bool xe_sriov_pf_migration_supported(struct xe_device *xe);
+#else
+static inline int xe_sriov_pf_migration_init(struct xe_device *xe)
+{
+ return 0;
+}
+static inline bool xe_sriov_pf_migration_supported(struct xe_device *xe)
+{
+ return false;
+}
+#endif
+
+#endif
diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_migration_types.h b/drivers/gpu/drm/xe/xe_sriov_pf_migration_types.h
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_types.h b/drivers/gpu/drm/xe/xe_sriov_pf_types.h
index 956a88f9f213d..2d2fcc0a2f258 100644
--- a/drivers/gpu/drm/xe/xe_sriov_pf_types.h
+++ b/drivers/gpu/drm/xe/xe_sriov_pf_types.h
@@ -32,6 +32,11 @@ struct xe_device_pf {
/** @driver_max_vfs: Maximum number of VFs supported by the driver. */
u16 driver_max_vfs;

+ struct {
+ /** @migration.supported: indicates whether VF migration feature is supported */
+ bool supported;
+ } migration;
+
/** @master_lock: protects all VFs configurations across GTs */
struct mutex master_lock;

--
2.50.1