[PATCH v4 1/4] drm/xe/vf: Helper for telling whether CCS migration BBs are needed

[Tomasz Lis <tomasz.lis@intel.com>]

To avoid having duplicated checks, and also provide clear
documentation of what are we checking for, the conditions
for initing CCS BBs for VF migration are closed into a function.

v2: shuffled words in the name

Signed-off-by: Tomasz Lis <tomasz.lis@intel.com>
---
 drivers/gpu/drm/xe/xe_sriov_vf_ccs.c | 17 ++++++++++++++++-
 drivers/gpu/drm/xe/xe_sriov_vf_ccs.h |  2 ++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_sriov_vf_ccs.c b/drivers/gpu/drm/xe/xe_sriov_vf_ccs.c
index 790249801364..a2d61b37ff21 100644
--- a/drivers/gpu/drm/xe/xe_sriov_vf_ccs.c
+++ b/drivers/gpu/drm/xe/xe_sriov_vf_ccs.c
@@ -260,6 +260,21 @@ int xe_sriov_vf_ccs_register_context(struct xe_device *xe)
 	return err;
 }
 
+/**
+ * xe_sriov_vf_migration_ccs_bb_needed - Whether GuC requires CCS copy BBs for VF migration.
+ * @xe: the &xe_device instance.
+ *
+ * Only selected platforms require VF KMD to maintain CCS copy BBs and linked LRCAs.
+ *
+ * Return: true if VF driver must participate in the CCS migration, false otherwise.
+ */
+bool xe_sriov_vf_migration_ccs_bb_needed(struct xe_device *xe)
+{
+	xe_assert(xe, IS_SRIOV_VF(xe));
+
+	return !IS_DGFX(xe) && xe_device_has_flat_ccs(xe);
+}
+
 static void xe_sriov_vf_ccs_fini(void *arg)
 {
 	struct xe_sriov_vf_ccs_ctx *ctx = arg;
@@ -294,7 +309,7 @@ int xe_sriov_vf_ccs_init(struct xe_device *xe)
 	xe_assert(xe, IS_SRIOV_VF(xe));
 	xe_assert(xe, xe_sriov_vf_migration_supported(xe));
 
-	if (IS_DGFX(xe) || !xe_device_has_flat_ccs(xe))
+	if (!xe_sriov_vf_migration_ccs_bb_needed(xe))
 		return 0;
 
 	for_each_ccs_rw_ctx(ctx_id) {
diff --git a/drivers/gpu/drm/xe/xe_sriov_vf_ccs.h b/drivers/gpu/drm/xe/xe_sriov_vf_ccs.h
index f8ca6efce9ee..0e6b27016dac 100644
--- a/drivers/gpu/drm/xe/xe_sriov_vf_ccs.h
+++ b/drivers/gpu/drm/xe/xe_sriov_vf_ccs.h
@@ -14,6 +14,8 @@ struct drm_printer;
 struct xe_device;
 struct xe_bo;
 
+bool xe_sriov_vf_migration_ccs_bb_needed(struct xe_device *xe);
+
 int xe_sriov_vf_ccs_init(struct xe_device *xe);
 int xe_sriov_vf_ccs_attach_bo(struct xe_bo *bo);
 int xe_sriov_vf_ccs_detach_bo(struct xe_bo *bo);
-- 
2.25.1