[Intel-gfx] [RFC PATCH 2/5] drm/i915/flat-CCS: Add flat CCS plane capabilities and modifiers

[Adrian Larumbe <adrian.larumbe@collabora.com>]

Adds frame buffer support code for flat-CCS devices, like DG2. A flat-CCS
modifier is attached to a fb object that contains the original bo by means
of the drmModeAddFB2WithModifiers drm API call.

Signed-off-by: Adrian Larumbe <adrian.larumbe@collabora.com>
---
 drivers/gpu/drm/i915/display/intel_fb.c | 36 ++++++++++++++++++++++---
 drivers/gpu/drm/i915/display/intel_fb.h |  1 +
 2 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fb.c b/drivers/gpu/drm/i915/display/intel_fb.c
index 72040f580911..6f998d1956bb 100644
--- a/drivers/gpu/drm/i915/display/intel_fb.c
+++ b/drivers/gpu/drm/i915/display/intel_fb.c
@@ -158,19 +158,24 @@ static const struct intel_modifier_desc intel_modifiers[] = {
 	{
 		.modifier = I915_FORMAT_MOD_4_TILED_DG2_MC_CCS,
 		.display_ver = { 13, 14 },
-		.plane_caps = INTEL_PLANE_CAP_TILING_4 | INTEL_PLANE_CAP_CCS_MC,
+		.plane_caps = INTEL_PLANE_CAP_TILING_4 |
+				INTEL_PLANE_CAP_CCS_MC |
+				INTEL_PLANE_CAP_DG2_CCS,
 	}, {
 		.modifier = I915_FORMAT_MOD_4_TILED_DG2_RC_CCS_CC,
 		.display_ver = { 13, 14 },
-		.plane_caps = INTEL_PLANE_CAP_TILING_4 | INTEL_PLANE_CAP_CCS_RC_CC,
-
+		.plane_caps = INTEL_PLANE_CAP_TILING_4 |
+				INTEL_PLANE_CAP_CCS_RC_CC |
+				INTEL_PLANE_CAP_DG2_CCS,
 		.ccs.cc_planes = BIT(1),
 
 		FORMAT_OVERRIDE(gen12_flat_ccs_cc_formats),
 	}, {
 		.modifier = I915_FORMAT_MOD_4_TILED_DG2_RC_CCS,
 		.display_ver = { 13, 14 },
-		.plane_caps = INTEL_PLANE_CAP_TILING_4 | INTEL_PLANE_CAP_CCS_RC,
+		.plane_caps = INTEL_PLANE_CAP_TILING_4 |
+				INTEL_PLANE_CAP_CCS_RC |
+				INTEL_PLANE_CAP_DG2_CCS,
 	}, {
 		.modifier = I915_FORMAT_MOD_4_TILED,
 		.display_ver = { 13, 14 },
@@ -313,6 +318,20 @@ bool intel_fb_is_ccs_modifier(u64 modifier)
 				      INTEL_PLANE_CAP_CCS_MASK);
 }
 
+/**
+ * if (intel_fb_is_dg2_ccs_modifier): Check if a modifier is a DG2 CCS modifier type
+ * @modifier: Modifier to check
+ *
+ * Returns:
+ * Returns %true if @modifier is a render, render with color clear or
+ * media compression modifier compatible with DG2 devices.
+ */
+bool intel_fb_is_dg2_ccs_modifier(u64 modifier)
+{
+	return plane_caps_contain_any(lookup_modifier(modifier)->plane_caps,
+				      INTEL_PLANE_CAP_DG2_CCS);
+}
+
 /**
  * intel_fb_is_rc_ccs_cc_modifier: Check if a modifier is an RC CCS CC modifier type
  * @modifier: Modifier to check
@@ -2000,6 +2019,15 @@ int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
 		intel_fb->dpt_vm = vm;
 	}
 
+	/*
+	 * In devices with flat CCS support, a compressed buffer object
+	 * will need to shuffle its CCS block back and forth between lmem
+	 * and smem at object migration events.
+	 */
+	if (intel_fb_is_dg2_ccs_modifier(fb->modifier) && HAS_FLAT_CCS(dev_priv))
+		if (!i915_gem_object_migratable(obj) && i915_gem_object_is_lmem(obj))
+			obj->flat_css.enabled = true;
+
 	ret = drm_framebuffer_init(&dev_priv->drm, fb, &intel_fb_funcs);
 	if (ret) {
 		drm_err(&dev_priv->drm, "framebuffer init failed %d\n", ret);
diff --git a/drivers/gpu/drm/i915/display/intel_fb.h b/drivers/gpu/drm/i915/display/intel_fb.h
index 12386f13a4e0..5bd74ff9a449 100644
--- a/drivers/gpu/drm/i915/display/intel_fb.h
+++ b/drivers/gpu/drm/i915/display/intel_fb.h
@@ -28,6 +28,7 @@ struct intel_plane_state;
 #define INTEL_PLANE_CAP_TILING_Y	BIT(4)
 #define INTEL_PLANE_CAP_TILING_Yf	BIT(5)
 #define INTEL_PLANE_CAP_TILING_4	BIT(6)
+#define INTEL_PLANE_CAP_DG2_CCS		BIT(7)
 
 bool intel_fb_is_ccs_modifier(u64 modifier);
 bool intel_fb_is_rc_ccs_cc_modifier(u64 modifier);
-- 
2.34.1