drm/i915/gvt: Export intel_gvt_render_mmio_to_ring_id()

Since many emulation logic needs to convert the offset of ring registers
into ring id, we export it for other caller which might need it.

Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
(cherry picked from commit 62a6a53786fc4b4e7543cc63b704dbb3f7df4c0f)

2 files changed, 17 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index 44cd5ff5e97d..55cbdb022924 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -137,17 +137,26 @@ static int new_mmio_info(struct intel_gvt *gvt,
         return 0;
 }
 
-static int render_mmio_to_ring_id(struct intel_gvt *gvt, unsigned int reg)
+/**
+ * intel_gvt_render_mmio_to_ring_id - convert a mmio offset into ring id
+ * @gvt: a GVT device
+ * @offset: register offset
+ *
+ * Returns:
+ * Ring ID on success, negative error code if failed.
+ */
+int intel_gvt_render_mmio_to_ring_id(struct intel_gvt *gvt,
+                unsigned int offset)
 {
         enum intel_engine_id id;
         struct intel_engine_cs *engine;
 
-        reg &= ~GENMASK(11, 0);
+        offset &= ~GENMASK(11, 0);
         for_each_engine(engine, gvt->dev_priv, id) {
-                if (engine->mmio_base == reg)
+                if (engine->mmio_base == offset)
                         return id;
         }
-        return -1;
+        return -ENODEV;
 }
 
 #define offset_to_fence_num(offset) \
@@ -1409,7 +1418,7 @@ static int mmio_read_from_hw(struct intel_vgpu *vgpu,
 static int elsp_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
                 void *p_data, unsigned int bytes)
 {
-        int ring_id = render_mmio_to_ring_id(vgpu->gvt, offset);
+        int ring_id = intel_gvt_render_mmio_to_ring_id(vgpu->gvt, offset);
         struct intel_vgpu_execlist *execlist;
         u32 data = *(u32 *)p_data;
         int ret = 0;
@@ -1436,7 +1445,7 @@ static int ring_mode_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
                 void *p_data, unsigned int bytes)
 {
         u32 data = *(u32 *)p_data;
-        int ring_id = render_mmio_to_ring_id(vgpu->gvt, offset);
+        int ring_id = intel_gvt_render_mmio_to_ring_id(vgpu->gvt, offset);
         bool enable_execlist;
 
         write_vreg(vgpu, offset, p_data, bytes);
diff --git a/drivers/gpu/drm/i915/gvt/mmio.h b/drivers/gpu/drm/i915/gvt/mmio.h
index 32cd64ddad26..dbc04ad2c7a1 100644
--- a/drivers/gpu/drm/i915/gvt/mmio.h
+++ b/drivers/gpu/drm/i915/gvt/mmio.h
@@ -65,6 +65,8 @@ struct intel_gvt_mmio_info {
         struct hlist_node node;
 };
 
+int intel_gvt_render_mmio_to_ring_id(struct intel_gvt *gvt,
+                unsigned int reg);
 unsigned long intel_gvt_get_device_type(struct intel_gvt *gvt);
 bool intel_gvt_match_device(struct intel_gvt *gvt, unsigned long device);