[PATCH v2 4/4] drm/xe/vf: Do not disable VF migration on ATS-M

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

The ATS-M does support VF migration, and it has graphics ver below
the currently allowed range. Experimental support of this platform
should therefore be available.

This change allows experimental VF migration support on ATS-M. It
is also explicitly not allowing ADL, by adding condition on MEMIRQ.
Supporting VF migration through MMIO interrupts would require
some special handling in order to achieve reliability.

v2: Add MEMIRQ condition

Signed-off-by: Tomasz Lis <tomasz.lis@intel.com>
---
 drivers/gpu/drm/xe/xe_sriov_vf.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_sriov_vf.c b/drivers/gpu/drm/xe/xe_sriov_vf.c
index 5fb042c05112..fb2b3d41c610 100644
--- a/drivers/gpu/drm/xe/xe_sriov_vf.c
+++ b/drivers/gpu/drm/xe/xe_sriov_vf.c
@@ -159,10 +159,13 @@ static void vf_migration_init_early(struct xe_device *xe)
 		return vf_disable_migration(xe,
 					    "experimental feature not available on production builds");
 
-	if (GRAPHICS_VER(xe) < 20)
-		return vf_disable_migration(xe, "requires gfx version >= 20, but only %u found",
+	if (GRAPHICS_VER(xe) < 12)
+		return vf_disable_migration(xe, "requires gfx version >= 12, but only %u found",
 					    GRAPHICS_VER(xe));
 
+	if (!xe_device_has_memirq(xe))
+		return vf_disable_migration(xe, "requires memory-based IRQ support");
+
 	xe->sriov.vf.migration.enabled = true;
 	xe_sriov_dbg(xe, "migration support enabled\n");
 }
-- 
2.25.1