drm/i915: Introduce i915_fb_pin_ggtt_(un)pin()

Extract the inner DPT parts of intel_plane_(un)pin() into the
i915_fb_pin_ggtt_(un)pin(). These will become part of the new
fb_pin parent interface.

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260508143426.26504-7-ville.syrjala@linux.intel.com

1 files changed, 44 insertions, 24 deletions

diff --git a/drivers/gpu/drm/i915/i915_fb_pin.c b/drivers/gpu/drm/i915/i915_fb_pin.c
index 0019f570d843..e14d2c1fb81f 100644
--- a/drivers/gpu/drm/i915/i915_fb_pin.c
+++ b/drivers/gpu/drm/i915/i915_fb_pin.c
@@ -257,6 +257,41 @@ intel_plane_fb_vtd_guard(const struct intel_plane_state *plane_state)
 				       plane_state->hw.rotation);
 }
 
+static int i915_fb_pin_ggtt_pin(struct drm_gem_object *obj,
+				const struct intel_fb_pin_params *pin_params,
+				struct i915_vma **out_ggtt_vma,
+				u32 *out_offset,
+				int *out_fence_id)
+{
+	struct i915_vma *ggtt_vma;
+
+	ggtt_vma = intel_fb_pin_to_ggtt(obj, pin_params, out_fence_id);
+	if (IS_ERR(ggtt_vma))
+		return PTR_ERR(ggtt_vma);
+
+	*out_ggtt_vma = ggtt_vma;
+
+	/*
+	 * Pre-populate the dma address before we enter the vblank
+	 * evade critical section as i915_gem_object_get_dma_address()
+	 * will trigger might_sleep() even if it won't actually sleep,
+	 * which is the case when the fb has already been pinned.
+	 */
+	if (pin_params->needs_physical)
+		*out_offset = i915_gem_object_get_dma_address(to_intel_bo(obj), 0);
+	else
+		*out_offset = i915_ggtt_offset(ggtt_vma);
+
+	return 0;
+}
+
+static void i915_fb_pin_ggtt_unpin(struct i915_vma *ggtt_vma,
+				   int fence_id)
+{
+	if (ggtt_vma)
+		intel_fb_unpin_vma(ggtt_vma, fence_id);
+}
+
 static int i915_fb_pin_dpt_pin(struct drm_gem_object *obj, struct intel_dpt *dpt,
 			       const struct intel_fb_pin_params *pin_params,
 			       struct i915_vma **out_dpt_vma,
@@ -325,24 +360,11 @@ int intel_plane_pin_fb(struct intel_plane_state *plane_state,
 			.needs_fence = intel_plane_needs_fence(display),
 		};
 
-		ggtt_vma = intel_fb_pin_to_ggtt(intel_fb_bo(&fb->base), &pin_params,
-						intel_plane_uses_fence(plane_state) ? &fence_id : NULL);
-		if (IS_ERR(ggtt_vma))
-			return PTR_ERR(ggtt_vma);
-
-		/*
-		 * Pre-populate the dma address before we enter the vblank
-		 * evade critical section as i915_gem_object_get_dma_address()
-		 * will trigger might_sleep() even if it won't actually sleep,
-		 * which is the case when the fb has already been pinned.
-		 */
-		if (intel_plane_needs_physical(plane)) {
-			struct drm_i915_gem_object *obj = to_intel_bo(intel_fb_bo(&fb->base));
-
-			offset = i915_gem_object_get_dma_address(obj, 0);
-		} else {
-			offset = i915_ggtt_offset(ggtt_vma);
-		}
+		ret = i915_fb_pin_ggtt_pin(intel_fb_bo(&fb->base),
+					   &pin_params, &ggtt_vma, &offset,
+					   intel_plane_uses_fence(plane_state) ? &fence_id : NULL);
+		if (ret)
+			return ret;
 	} else {
 		struct intel_fb_pin_params pin_params = {
 			.view = &plane_state->view.gtt,
@@ -371,13 +393,11 @@ void intel_plane_unpin_fb(struct intel_plane_state *old_plane_state)
 		to_intel_framebuffer(old_plane_state->hw.fb);
 
 	if (!intel_fb_uses_dpt(&fb->base)) {
-		struct i915_vma *vma;
+		i915_fb_pin_ggtt_unpin(old_plane_state->ggtt_vma,
+				       old_plane_state->fence_id);
 
-		vma = fetch_and_zero(&old_plane_state->ggtt_vma);
-		if (vma) {
-			intel_fb_unpin_vma(vma, old_plane_state->fence_id);
-			old_plane_state->fence_id = -1;
-		}
+		old_plane_state->ggtt_vma = NULL;
+		old_plane_state->fence_id = -1;
 	} else {
 		i915_fb_pin_dpt_unpin(fb->dpt,
 				      old_plane_state->dpt_vma,