drm/gma500: Allocate GTT ranges in stolen memory with psb_gem_create()

Support private objects for stolen memory in psb_gem_create() and
convert users to psb_gem_create(). For stolen memory, psb_gem_create()
now initializes the GEM object via drm_gem_private_object_init().

In the fbdev setup, replace the open-coded initialization of struct
gtt_range with a call to psb_gem_create(). Use drm_gem_object_put()
for release.

In the cursor setup, use psb_gem_create() and get a real GEM object.
Previously the allocated instance of struct gtt_range was only partially
initialized. Release the cursor GEM object in gma_crtc_destroy(). The
release was missing from the original code.

With the conversion of all callers to psb_gem_create(), the extern
declarations of psb_gtt_alloc_range, psb_gtt_free_range and
psb_gem_object_func are not required any longer. Declare them as
static.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211015084053.13708-5-tzimmermann@suse.de

drivers/gpu/drm/gma500/framebuffer.c

@@ -224,31 +224,6 @@ static struct drm_framebuffer *psb_framebuffer_create
 	return fb;
 }
 
-/**
- *	psbfb_alloc		-	allocate frame buffer memory
- *	@dev: the DRM device
- *	@aligned_size: space needed
- *
- *	Allocate the frame buffer. In the usual case we get a GTT range that
- *	is stolen memory backed and life is simple. If there isn't sufficient
- *	we fail as we don't have the virtual mapping space to really vmap it
- *	and the kernel console code can't handle non linear framebuffers.
- *
- *	Re-address this as and if the framebuffer layer grows this ability.
- */
-static struct gtt_range *psbfb_alloc(struct drm_device *dev, int aligned_size)
-{
-	struct gtt_range *backing;
-	/* Begin by trying to use stolen memory backing */
-	backing = psb_gtt_alloc_range(dev, aligned_size, "fb", 1, PAGE_SIZE);
-	if (backing) {
-		backing->gem.funcs = &psb_gem_object_funcs;
-		drm_gem_private_object_init(dev, &backing->gem, aligned_size);
-		return backing;
-	}
-	return NULL;
-}
-
 /**
  *	psbfb_create		-	create a framebuffer
  *	@fb_helper: the framebuffer helper
@@ -268,6 +243,7 @@ static int psbfb_create(struct drm_fb_helper *fb_helper,
 	int size;
 	int ret;
 	struct gtt_range *backing;
+	struct drm_gem_object *obj;
 	u32 bpp, depth;
 
 	mode_cmd.width = sizes->surface_width;
@@ -285,24 +261,25 @@ static int psbfb_create(struct drm_fb_helper *fb_helper,
 	size = ALIGN(size, PAGE_SIZE);
 
 	/* Allocate the framebuffer in the GTT with stolen page backing */
-	backing = psbfb_alloc(dev, size);
-	if (backing == NULL)
-		return -ENOMEM;
+	backing = psb_gem_create(dev, size, "fb", true, PAGE_SIZE);
+	if (IS_ERR(backing))
+		return PTR_ERR(backing);
+	obj = &backing->gem;
 
 	memset(dev_priv->vram_addr + backing->offset, 0, size);
 
 	info = drm_fb_helper_alloc_fbi(fb_helper);
 	if (IS_ERR(info)) {
 		ret = PTR_ERR(info);
-		goto out;
+		goto err_drm_gem_object_put;
 	}
 
 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);
 
-	fb = psb_framebuffer_create(dev, &mode_cmd, &backing->gem);
+	fb = psb_framebuffer_create(dev, &mode_cmd, obj);
 	if (IS_ERR(fb)) {
 		ret = PTR_ERR(fb);
-		goto out;
+		goto err_drm_gem_object_put;
 	}
 
 	fb_helper->fb = fb;
@@ -333,8 +310,9 @@ static int psbfb_create(struct drm_fb_helper *fb_helper,
 	dev_dbg(dev->dev, "allocated %dx%d fb\n", fb->width, fb->height);
 
 	return 0;
-out:
-	psb_gtt_free_range(dev, backing);
+
+err_drm_gem_object_put:
+	drm_gem_object_put(obj);
 	return ret;
 }
 

drivers/gpu/drm/gma500/gem.c

@@ -101,7 +101,7 @@ void psb_gtt_unpin(struct gtt_range *gt)
 	mutex_unlock(&dev_priv->gtt_mutex);
 }
 
-void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt)
+static void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt)
 {
 	/* Undo the mmap pin if we are destroying the object */
 	if (gt->mmapping) {
@@ -133,13 +133,13 @@ static const struct vm_operations_struct psb_gem_vm_ops = {
 	.close = drm_gem_vm_close,
 };
 
-const struct drm_gem_object_funcs psb_gem_object_funcs = {
+static const struct drm_gem_object_funcs psb_gem_object_funcs = {
 	.free = psb_gem_free_object,
 	.vm_ops = &psb_gem_vm_ops,
 };
 
-struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
-				      const char *name, int backed, u32 align)
+static struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
+					     const char *name, int backed, u32 align)
 {
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 	struct gtt_range *gt;
@@ -193,12 +193,16 @@ psb_gem_create(struct drm_device *dev, u64 size, const char *name, bool stolen,
 
 	obj->funcs = &psb_gem_object_funcs;
 
-	ret = drm_gem_object_init(dev, obj, size);
-	if (ret)
-		goto err_psb_gtt_free_range;
+	if (stolen) {
+		drm_gem_private_object_init(dev, obj, size);
+	} else {
+		ret = drm_gem_object_init(dev, obj, size);
+		if (ret)
+			goto err_psb_gtt_free_range;
 
-	/* Limit the object to 32-bit mappings */
-	mapping_set_gfp_mask(obj->filp->f_mapping, GFP_KERNEL | __GFP_DMA32);
+		/* Limit the object to 32-bit mappings */
+		mapping_set_gfp_mask(obj->filp->f_mapping, GFP_KERNEL | __GFP_DMA32);
+	}
 
 	return gt;
 

drivers/gpu/drm/gma500/gem.h

@@ -12,14 +12,9 @@
 
 struct drm_device;
 
-extern const struct drm_gem_object_funcs psb_gem_object_funcs;
-
 struct gtt_range *
 psb_gem_create(struct drm_device *dev, u64 size, const char *name, bool stolen, u32 align);
 
-struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len, const char *name,
-				      int backed, u32 align);
-void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt);
 int psb_gtt_pin(struct gtt_range *gt);
 void psb_gtt_unpin(struct gtt_range *gt);
 

drivers/gpu/drm/gma500/gma_display.c

@@ -498,6 +498,9 @@ void gma_crtc_destroy(struct drm_crtc *crtc)
 {
 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
 
+	if (gma_crtc->cursor_gt)
+		drm_gem_object_put(&gma_crtc->cursor_gt->gem);
+
 	kfree(gma_crtc->crtc_state);
 	drm_crtc_cleanup(crtc);
 	kfree(gma_crtc);

drivers/gpu/drm/gma500/psb_intel_display.c

@@ -461,9 +461,8 @@ static void psb_intel_cursor_init(struct drm_device *dev,
 		/* Allocate 4 pages of stolen mem for a hardware cursor. That
 		 * is enough for the 64 x 64 ARGB cursors we support.
 		 */
-		cursor_gt = psb_gtt_alloc_range(dev, 4 * PAGE_SIZE, "cursor", 1,
-						PAGE_SIZE);
-		if (!cursor_gt) {
+		cursor_gt = psb_gem_create(dev, 4 * PAGE_SIZE, "cursor", true, PAGE_SIZE);
+		if (IS_ERR(cursor_gt)) {
 			gma_crtc->cursor_gt = NULL;
 			goto out;
 		}