drm/i915: Move stolen memory handling into i915_gem_stolen

We are preparing for Xe. Xe stolen memory handling differs from i915 so we
want to move stolen memory handling details into i915_gem_stolen.

Also add a common type for fbc compressed fb and use it from fbc code
instead of underlying type directly. This way we can have common type
i915_stolen_fb for both i915 and Xe.

v2: Fix couple of checkpatch warnings

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230614051731.745821-2-jouni.hogander@intel.com

drivers/gpu/drm/i915/display/intel_fbc.c

@@ -94,8 +94,7 @@ struct intel_fbc {
 	struct mutex lock;
 	unsigned int busy_bits;
 
-	struct drm_mm_node compressed_fb;
+	struct i915_stolen_fb compressed_fb, compressed_llb;
-	struct drm_mm_node compressed_llb;
 
 	enum intel_fbc_id id;
 
@@ -332,15 +331,16 @@ static void i8xx_fbc_program_cfb(struct intel_fbc *fbc)
 {
 	struct drm_i915_private *i915 = fbc->i915;
 
-	GEM_BUG_ON(range_overflows_end_t(u64, i915->dsm.stolen.start,
+	GEM_BUG_ON(range_overflows_end_t(u64, i915_gem_stolen_area_address(i915),
-					 fbc->compressed_fb.start, U32_MAX));
+					 i915_gem_stolen_node_offset(&fbc->compressed_fb),
-	GEM_BUG_ON(range_overflows_end_t(u64, i915->dsm.stolen.start,
+					 U32_MAX));
-					 fbc->compressed_llb.start, U32_MAX));
+	GEM_BUG_ON(range_overflows_end_t(u64, i915_gem_stolen_area_address(i915),
-
+					 i915_gem_stolen_node_offset(&fbc->compressed_llb),
+					 U32_MAX));
 	intel_de_write(i915, FBC_CFB_BASE,
-		       i915->dsm.stolen.start + fbc->compressed_fb.start);
+		       i915_gem_stolen_node_address(i915, &fbc->compressed_fb));
 	intel_de_write(i915, FBC_LL_BASE,
-		       i915->dsm.stolen.start + fbc->compressed_llb.start);
+		       i915_gem_stolen_node_address(i915, &fbc->compressed_llb));
 }
 
 static const struct intel_fbc_funcs i8xx_fbc_funcs = {
@@ -447,7 +447,8 @@ static void g4x_fbc_program_cfb(struct intel_fbc *fbc)
 {
 	struct drm_i915_private *i915 = fbc->i915;
 
-	intel_de_write(i915, DPFC_CB_BASE, fbc->compressed_fb.start);
+	intel_de_write(i915, DPFC_CB_BASE,
+		       i915_gem_stolen_node_offset(&fbc->compressed_fb));
 }
 
 static const struct intel_fbc_funcs g4x_fbc_funcs = {
@@ -498,7 +499,8 @@ static void ilk_fbc_program_cfb(struct intel_fbc *fbc)
 {
 	struct drm_i915_private *i915 = fbc->i915;
 
-	intel_de_write(i915, ILK_DPFC_CB_BASE(fbc->id), fbc->compressed_fb.start);
+	intel_de_write(i915, ILK_DPFC_CB_BASE(fbc->id),
+		       i915_gem_stolen_node_offset(&fbc->compressed_fb));
 }
 
 static const struct intel_fbc_funcs ilk_fbc_funcs = {
@@ -713,7 +715,7 @@ static u64 intel_fbc_stolen_end(struct drm_i915_private *i915)
 	 * underruns, even if that range is not reserved by the BIOS. */
 	if (IS_BROADWELL(i915) ||
 	    (DISPLAY_VER(i915) == 9 && !IS_BROXTON(i915)))
-		end = resource_size(&i915->dsm.stolen) - 8 * 1024 * 1024;
+		end = i915_gem_stolen_area_size(i915) - 8 * 1024 * 1024;
 	else
 		end = U64_MAX;
 
@@ -770,9 +772,9 @@ static int intel_fbc_alloc_cfb(struct intel_fbc *fbc,
 	int ret;
 
 	drm_WARN_ON(&i915->drm,
-		    drm_mm_node_allocated(&fbc->compressed_fb));
+		    i915_gem_stolen_node_allocated(&fbc->compressed_fb));
 	drm_WARN_ON(&i915->drm,
-		    drm_mm_node_allocated(&fbc->compressed_llb));
+		    i915_gem_stolen_node_allocated(&fbc->compressed_llb));
 
 	if (DISPLAY_VER(i915) < 5 && !IS_G4X(i915)) {
 		ret = i915_gem_stolen_insert_node(i915, &fbc->compressed_llb,
@@ -792,15 +794,14 @@ static int intel_fbc_alloc_cfb(struct intel_fbc *fbc,
 
 	drm_dbg_kms(&i915->drm,
 		    "reserved %llu bytes of contiguous stolen space for FBC, limit: %d\n",
-		    fbc->compressed_fb.size, fbc->limit);
+		    i915_gem_stolen_node_size(&fbc->compressed_fb), fbc->limit);
-
 	return 0;
 
 err_llb:
-	if (drm_mm_node_allocated(&fbc->compressed_llb))
+	if (i915_gem_stolen_node_allocated(&fbc->compressed_llb))
 		i915_gem_stolen_remove_node(i915, &fbc->compressed_llb);
 err:
-	if (drm_mm_initialized(&i915->mm.stolen))
+	if (i915_gem_stolen_initialized(i915))
 		drm_info_once(&i915->drm, "not enough stolen space for compressed buffer (need %d more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.\n", size);
 	return -ENOSPC;
 }
@@ -825,9 +826,9 @@ static void __intel_fbc_cleanup_cfb(struct intel_fbc *fbc)
 	if (WARN_ON(intel_fbc_hw_is_active(fbc)))
 		return;
 
-	if (drm_mm_node_allocated(&fbc->compressed_llb))
+	if (i915_gem_stolen_node_allocated(&fbc->compressed_llb))
 		i915_gem_stolen_remove_node(i915, &fbc->compressed_llb);
-	if (drm_mm_node_allocated(&fbc->compressed_fb))
+	if (i915_gem_stolen_node_allocated(&fbc->compressed_fb))
 		i915_gem_stolen_remove_node(i915, &fbc->compressed_fb);
 }
 
@@ -1030,7 +1031,8 @@ static bool intel_fbc_is_cfb_ok(const struct intel_plane_state *plane_state)
 	struct intel_fbc *fbc = plane->fbc;
 
 	return intel_fbc_min_limit(plane_state) <= fbc->limit &&
-		intel_fbc_cfb_size(plane_state) <= fbc->compressed_fb.size * fbc->limit;
+		intel_fbc_cfb_size(plane_state) <= fbc->limit *
+			i915_gem_stolen_node_size(&fbc->compressed_fb);
 }
 
 static bool intel_fbc_is_ok(const struct intel_plane_state *plane_state)
@@ -1707,7 +1709,7 @@ void intel_fbc_init(struct drm_i915_private *i915)
 {
 	enum intel_fbc_id fbc_id;
 
-	if (!drm_mm_initialized(&i915->mm.stolen))
+	if (!i915_gem_stolen_initialized(i915))
 		DISPLAY_RUNTIME_INFO(i915)->fbc_mask = 0;
 
 	if (need_fbc_vtd_wa(i915))

drivers/gpu/drm/i915/gem/i915_gem_stolen.c

@@ -974,3 +974,39 @@ bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj)
 {
 	return obj->ops == &i915_gem_object_stolen_ops;
 }
+
+bool i915_gem_stolen_initialized(const struct drm_i915_private *i915)
+{
+	return drm_mm_initialized(&i915->mm.stolen);
+}
+
+u64 i915_gem_stolen_area_address(const struct drm_i915_private *i915)
+{
+	return i915->dsm.stolen.start;
+}
+
+u64 i915_gem_stolen_area_size(const struct drm_i915_private *i915)
+{
+	return resource_size(&i915->dsm.stolen);
+}
+
+u64 i915_gem_stolen_node_address(const struct drm_i915_private *i915,
+				 const struct drm_mm_node *node)
+{
+	return i915->dsm.stolen.start + i915_gem_stolen_node_offset(node);
+}
+
+bool i915_gem_stolen_node_allocated(const struct drm_mm_node *node)
+{
+	return drm_mm_node_allocated(node);
+}
+
+u64 i915_gem_stolen_node_offset(const struct drm_mm_node *node)
+{
+	return node->start;
+}
+
+u64 i915_gem_stolen_node_size(const struct drm_mm_node *node)
+{
+	return node->size;
+}

drivers/gpu/drm/i915/gem/i915_gem_stolen.h

@@ -12,6 +12,8 @@ struct drm_i915_private;
 struct drm_mm_node;
 struct drm_i915_gem_object;
 
+#define i915_stolen_fb drm_mm_node
+
 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
 				struct drm_mm_node *node, u64 size,
 				unsigned alignment);
@@ -36,4 +38,15 @@ bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj);
 
 #define I915_GEM_STOLEN_BIAS SZ_128K
 
+bool i915_gem_stolen_initialized(const struct drm_i915_private *i915);
+u64 i915_gem_stolen_area_address(const struct drm_i915_private *i915);
+u64 i915_gem_stolen_area_size(const struct drm_i915_private *i915);
+
+u64 i915_gem_stolen_node_address(const struct drm_i915_private *i915,
+				 const struct drm_mm_node *node);
+
+bool i915_gem_stolen_node_allocated(const struct drm_mm_node *node);
+u64 i915_gem_stolen_node_offset(const struct drm_mm_node *node);
+u64 i915_gem_stolen_node_size(const struct drm_mm_node *node);
+
 #endif /* __I915_GEM_STOLEN_H__ */