drm/i915: give stolen_usable_size a more suitable home

Kick it out of i915_ggtt and keep it grouped with dsm and dsm_reserved,
where it makes the most sense.

Signed-off-by: Matthew Auld <[e-mail]>
Cc: Joonas Lahtinen <[e-mail]>
Cc: Chris Wilson <[e-mail]>
Cc: Paulo Zanoni <[e-mail]>
Reviewed-by: Chris Wilson <[e-mail]>
Signed-off-by: Joonas Lahtinen <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/i915_drv.h

···
 	/**
 	 * Data Stolen Memory - aka "i915 stolen memory" gives us the start and
 	 * end of stolen which we can optionally use to create GEM objects
-	 * backed by stolen memory. Note that ggtt->stolen_usable_size tells us
+	 * backed by stolen memory. Note that stolen_usable_size tells us
 	 * exactly how much of this we are actually allowed to use, given that
 	 * some portion of it is in fact reserved for use by hardware functions.
 	 */
···
 	 * Reseved portion of Data Stolen Memory
 	 */
 	struct resource dsm_reserved;
+
+	/*
+	 * Stolen memory is segmented in hardware with different portions
+	 * offlimits to certain functions.
+	 *
+	 * The drm_mm is initialised to the total accessible range, as found
+	 * from the PCI config. On Broadwell+, this is further restricted to
+	 * avoid the first page! The upper end of stolen memory is reserved for
+	 * hardware functions and similarly removed from the accessible range.
+	 */
+	u32 stolen_usable_size;	/* Total size minus reserved ranges */
 
 	void __iomem *regs;
 

drivers/gpu/drm/i915/i915_gem_gtt.h

···
 	struct resource gmadr;          /* GMADR resource */
 	u64 mappable_end;		/* End offset that we can CPU map */
 
-	/* Stolen memory is segmented in hardware with different portions
-	 * offlimits to certain functions.
-	 *
-	 * The drm_mm is initialised to the total accessible range, as found
-	 * from the PCI config. On Broadwell+, this is further restricted to
-	 * avoid the first page! The upper end of stolen memory is reserved for
-	 * hardware functions and similarly removed from the accessible range.
-	 */
-	u32 stolen_usable_size;	/* Total size minus reserved ranges */
-
 	/** "Graphics Stolen Memory" holds the global PTEs */
 	void __iomem *gsm;
 	void (*invalidate)(struct drm_i915_private *dev_priv);

drivers/gpu/drm/i915/i915_gem_stolen.c

···
 
 int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 {
-	struct i915_ggtt *ggtt = &dev_priv->ggtt;
 	dma_addr_t reserved_base, stolen_top;
 	u32 reserved_total, reserved_size;
 	u32 stolen_usable_start;
···
 	if (INTEL_GEN(dev_priv) >= 8)
 		stolen_usable_start = 4096;
 
-	ggtt->stolen_usable_size =
+	dev_priv->stolen_usable_size =
 		resource_size(&dev_priv->dsm) - reserved_total - stolen_usable_start;
 
 	/* Basic memrange allocator for stolen space. */
 	drm_mm_init(&dev_priv->mm.stolen, stolen_usable_start,
-		    ggtt->stolen_usable_size);
+		    dev_priv->stolen_usable_size);
 
 	return 0;
 }

drivers/gpu/drm/i915/intel_display.c

···
 {
 	struct drm_device *dev = crtc->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct i915_ggtt *ggtt = &dev_priv->ggtt;
 	struct drm_i915_gem_object *obj = NULL;
 	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 	struct drm_framebuffer *fb = &plane_config->fb->base;
···
 	/* If the FB is too big, just don't use it since fbdev is not very
 	 * important and we should probably use that space with FBC or other
 	 * features. */
-	if (size_aligned * 2 > ggtt->stolen_usable_size)
+	if (size_aligned * 2 > dev_priv->stolen_usable_size)
 		return false;
 
 	mutex_lock(&dev->struct_mutex);

drivers/gpu/drm/i915/intel_fbdev.c

···
 	struct drm_framebuffer *fb;
 	struct drm_device *dev = helper->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct i915_ggtt *ggtt = &dev_priv->ggtt;
 	struct drm_mode_fb_cmd2 mode_cmd = {};
 	struct drm_i915_gem_object *obj;
 	int size, ret;
···
 	 * important and we should probably use that space with FBC or other
 	 * features. */
 	obj = NULL;
-	if (size * 2 < ggtt->stolen_usable_size)
+	if (size * 2 < dev_priv->stolen_usable_size)
 		obj = i915_gem_object_create_stolen(dev_priv, size);
 	if (obj == NULL)
 		obj = i915_gem_object_create(dev_priv, size);