drm/gma500: Move GEM BO to drm_framebuffer

Since drm_framebuffer can now store GEM objects directly, place them
there rather than in our own subclass. As this makes the framebuffer
create_handle and destroy functions the same as the GEM framebuffer
helper, we can reuse those.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180330141138.28987-20-daniels@collabora.com

drivers/gpu/drm/gma500/accel_2d.c

@@ -251,7 +251,7 @@ static void psbfb_copyarea_accel(struct fb_info *info,
 	if (!fb)
 		return;
 
-	offset = psbfb->gtt->offset;
+	offset = to_gtt_range(fb->obj[0])->offset;
 	stride = fb->pitches[0];
 
 	switch (fb->format->depth) {

drivers/gpu/drm/gma500/framebuffer.c

@@ -33,6 +33,7 @@
 #include <drm/drm.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
 
 #include "psb_drv.h"
 #include "psb_intel_reg.h"
@@ -40,14 +41,9 @@
 #include "framebuffer.h"
 #include "gtt.h"
 
-static void psb_user_framebuffer_destroy(struct drm_framebuffer *fb);
-static int psb_user_framebuffer_create_handle(struct drm_framebuffer *fb,
-					      struct drm_file *file_priv,
-					      unsigned int *handle);
-
 static const struct drm_framebuffer_funcs psb_fb_funcs = {
-	.destroy = psb_user_framebuffer_destroy,
-	.create_handle = psb_user_framebuffer_create_handle,
+	.destroy = drm_gem_fb_destroy,
+	.create_handle = drm_gem_fb_create_handle,
 };
 
 #define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)
@@ -96,17 +92,18 @@ static int psbfb_pan(struct fb_var_screeninfo *var, struct fb_info *info)
 	struct psb_fbdev *fbdev = info->par;
 	struct psb_framebuffer *psbfb = &fbdev->pfb;
 	struct drm_device *dev = psbfb->base.dev;
+	struct gtt_range *gtt = to_gtt_range(psbfb->base.obj[0]);
 
 	/*
 	 *	We have to poke our nose in here. The core fb code assumes
 	 *	panning is part of the hardware that can be invoked before
 	 *	the actual fb is mapped. In our case that isn't quite true.
 	 */
-	if (psbfb->gtt->npage) {
+	if (gtt->npage) {
 		/* GTT roll shifts in 4K pages, we need to shift the right
 		   number of pages */
 		int pages = info->fix.line_length >> 12;
-		psb_gtt_roll(dev, psbfb->gtt, var->yoffset * pages);
+		psb_gtt_roll(dev, gtt, var->yoffset * pages);
 	}
         return 0;
 }
@@ -117,13 +114,14 @@ static int psbfb_vm_fault(struct vm_fault *vmf)
 	struct psb_framebuffer *psbfb = vma->vm_private_data;
 	struct drm_device *dev = psbfb->base.dev;
 	struct drm_psb_private *dev_priv = dev->dev_private;
+	struct gtt_range *gtt = to_gtt_range(psbfb->base.obj[0]);
 	int page_num;
 	int i;
 	unsigned long address;
 	int ret;
 	unsigned long pfn;
 	unsigned long phys_addr = (unsigned long)dev_priv->stolen_base +
-				  psbfb->gtt->offset;
+				  gtt->offset;
 
 	page_num = vma_pages(vma);
 	address = vmf->address - (vmf->pgoff << PAGE_SHIFT);
@@ -246,7 +244,7 @@ static int psb_framebuffer_init(struct drm_device *dev,
 		return -EINVAL;
 
 	drm_helper_mode_fill_fb_struct(dev, &fb->base, mode_cmd);
-	fb->gtt = gt;
+	fb->base.obj[0] = &gt->gem;
 	ret = drm_framebuffer_init(dev, &fb->base, &psb_fb_funcs);
 	if (ret) {
 		dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
@@ -518,8 +516,8 @@ static int psb_fbdev_destroy(struct drm_device *dev, struct psb_fbdev *fbdev)
 	drm_framebuffer_unregister_private(&psbfb->base);
 	drm_framebuffer_cleanup(&psbfb->base);
 
-	if (psbfb->gtt)
-		drm_gem_object_unreference_unlocked(&psbfb->gtt->gem);
+	if (psbfb->base.obj[0])
+		drm_gem_object_unreference_unlocked(psbfb->base.obj[0]);
 	return 0;
 }
 
@@ -576,44 +574,6 @@ static void psb_fbdev_fini(struct drm_device *dev)
 	dev_priv->fbdev = NULL;
 }
 
-/**
- *	psb_user_framebuffer_create_handle - add hamdle to a framebuffer
- *	@fb: framebuffer
- *	@file_priv: our DRM file
- *	@handle: returned handle
- *
- *	Our framebuffer object is a GTT range which also contains a GEM
- *	object. We need to turn it into a handle for userspace. GEM will do
- *	the work for us
- */
-static int psb_user_framebuffer_create_handle(struct drm_framebuffer *fb,
-					      struct drm_file *file_priv,
-					      unsigned int *handle)
-{
-	struct psb_framebuffer *psbfb = to_psb_fb(fb);
-	struct gtt_range *r = psbfb->gtt;
-	return drm_gem_handle_create(file_priv, &r->gem, handle);
-}
-
-/**
- *	psb_user_framebuffer_destroy	-	destruct user created fb
- *	@fb: framebuffer
- *
- *	User framebuffers are backed by GEM objects so all we have to do is
- *	clean up a bit and drop the reference, GEM will handle the fallout
- */
-static void psb_user_framebuffer_destroy(struct drm_framebuffer *fb)
-{
-	struct psb_framebuffer *psbfb = to_psb_fb(fb);
-	struct gtt_range *r = psbfb->gtt;
-
-	/* Let DRM do its clean up */
-	drm_framebuffer_cleanup(fb);
-	/*  We are no longer using the resource in GEM */
-	drm_gem_object_unreference_unlocked(&r->gem);
-	kfree(fb);
-}
-
 static const struct drm_mode_config_funcs psb_mode_funcs = {
 	.fb_create = psb_user_framebuffer_create,
 	.output_poll_changed = drm_fb_helper_output_poll_changed,

drivers/gpu/drm/gma500/framebuffer.h

@@ -31,7 +31,6 @@ struct psb_framebuffer {
 	struct drm_framebuffer base;
 	struct address_space *addr_space;
 	struct fb_info *fbdev;
-	struct gtt_range *gtt;
 };
 
 struct psb_fbdev {

drivers/gpu/drm/gma500/gma_display.c

@@ -60,7 +60,7 @@ int gma_pipe_set_base(struct drm_crtc *crtc, int x, int y,
 	struct drm_psb_private *dev_priv = dev->dev_private;
 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
 	struct drm_framebuffer *fb = crtc->primary->fb;
-	struct psb_framebuffer *psbfb = to_psb_fb(fb);
+	struct gtt_range *gtt = to_gtt_range(fb->obj[0]);
 	int pipe = gma_crtc->pipe;
 	const struct psb_offset *map = &dev_priv->regmap[pipe];
 	unsigned long start, offset;
@@ -78,10 +78,10 @@ int gma_pipe_set_base(struct drm_crtc *crtc, int x, int y,
 
 	/* We are displaying this buffer, make sure it is actually loaded
 	   into the GTT */
-	ret = psb_gtt_pin(psbfb->gtt);
+	ret = psb_gtt_pin(gtt);
 	if (ret < 0)
 		goto gma_pipe_set_base_exit;
-	start = psbfb->gtt->offset;
+	start = gtt->offset;
 	offset = y * fb->pitches[0] + x * fb->format->cpp[0];
 
 	REG_WRITE(map->stride, fb->pitches[0]);
@@ -129,7 +129,7 @@ int gma_pipe_set_base(struct drm_crtc *crtc, int x, int y,
 gma_pipe_cleaner:
 	/* If there was a previous display we can now unpin it */
 	if (old_fb)
-		psb_gtt_unpin(to_psb_fb(old_fb)->gtt);
+		psb_gtt_unpin(to_gtt_range(old_fb->obj[0]));
 
 gma_pipe_set_base_exit:
 	gma_power_end(dev);
@@ -491,7 +491,7 @@ void gma_crtc_disable(struct drm_crtc *crtc)
 	crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 
 	if (crtc->primary->fb) {
-		gt = to_psb_fb(crtc->primary->fb)->gtt;
+		gt = to_gtt_range(crtc->primary->fb->obj[0]);
 		psb_gtt_unpin(gt);
 	}
 }

drivers/gpu/drm/gma500/gtt.h

@@ -53,6 +53,8 @@ struct gtt_range {
 	int roll;			/* Roll applied to the GTT entries */
 };
 
+#define to_gtt_range(x) container_of(x, struct gtt_range, gem)
+
 extern struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
 					     const char *name, int backed,
 					     u32 align);

drivers/gpu/drm/gma500/oaktrail_crtc.c

@@ -600,7 +600,6 @@ static int oaktrail_pipe_set_base(struct drm_crtc *crtc,
 	struct drm_psb_private *dev_priv = dev->dev_private;
 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
 	struct drm_framebuffer *fb = crtc->primary->fb;
-	struct psb_framebuffer *psbfb = to_psb_fb(fb);
 	int pipe = gma_crtc->pipe;
 	const struct psb_offset *map = &dev_priv->regmap[pipe];
 	unsigned long start, offset;
@@ -617,7 +616,7 @@ static int oaktrail_pipe_set_base(struct drm_crtc *crtc,
 	if (!gma_power_begin(dev, true))
 		return 0;
 
-	start = psbfb->gtt->offset;
+	start = to_gtt_range(fb->obj[0])->offset;
 	offset = y * fb->pitches[0] + x * fb->format->cpp[0];
 
 	REG_WRITE(map->stride, fb->pitches[0]);