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)

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index 44cd5ff..55cbdb0 100644 (file)
--- 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 32cd64d..dbc04ad 100644 (file)
--- 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);