drm/fb: Don't expose mmio for fbdev emulation layer

For the fbdev api if the struct fb_var_screeninfo accel_flags field is set
to FB_ACCELF_TEXT then userland applications can not mmap the mmio region.
Since it is a bad idea for DRM drivers to expose the mmio region via the
fbdev layer we always set the accel_flags to prevent this. Please apply.
Signed-off-by: NJames Simmons <jsimmons@infradead.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_fb_helper.c

@@ -985,6 +985,8 @@ void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 	info->fix.type = FB_TYPE_PACKED_PIXELS;
 	info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 		FB_VISUAL_TRUECOLOR;
+	info->fix.mmio_start = 0;
+	info->fix.mmio_len = 0;
 	info->fix.type_aux = 0;
 	info->fix.xpanstep = 1; /* doing it in hw */
 	info->fix.ypanstep = 1; /* doing it in hw */
@@ -1005,6 +1007,7 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
 	info->var.xres_virtual = fb->width;
 	info->var.yres_virtual = fb->height;
 	info->var.bits_per_pixel = fb->bits_per_pixel;
+	info->var.accel_flags = FB_ACCELF_TEXT;
 	info->var.xoffset = 0;
 	info->var.yoffset = 0;
 	info->var.activate = FB_ACTIVATE_NOW;

drivers/gpu/drm/i915/intel_fb.c

@@ -68,7 +68,7 @@ static int intelfb_create(struct intel_fbdev *ifbdev,
 	struct drm_gem_object *fbo = NULL;
 	struct drm_i915_gem_object *obj_priv;
 	struct device *device = &dev->pdev->dev;
-	int size, ret, mmio_bar = IS_GEN2(dev) ? 1 : 0;
+	int size, ret;
 
 	/* we don't do packed 24bpp */
 	if (sizes->surface_bpp == 24)
@@ -156,10 +156,6 @@ static int intelfb_create(struct intel_fbdev *ifbdev,
 	drm_fb_helper_fill_fix(info, fb->pitch, fb->depth);
 	drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 
-	/* FIXME: we really shouldn't expose mmio space at all */
-	info->fix.mmio_start = pci_resource_start(dev->pdev, mmio_bar);
-	info->fix.mmio_len = pci_resource_len(dev->pdev, mmio_bar);
-
 	info->pixmap.size = 64*1024;
 	info->pixmap.buf_align = 8;
 	info->pixmap.access_align = 32;

drivers/gpu/drm/nouveau/nouveau_fbcon.c

@@ -348,10 +348,6 @@ nouveau_fbcon_create(struct nouveau_fbdev *nfbdev,
 	drm_fb_helper_fill_fix(info, fb->pitch, fb->depth);
 	drm_fb_helper_fill_var(info, &nfbdev->helper, sizes->fb_width, sizes->fb_height);
 
-	/* FIXME: we really shouldn't expose mmio space at all */
-	info->fix.mmio_start = pci_resource_start(pdev, 1);
-	info->fix.mmio_len = pci_resource_len(pdev, 1);
-
 	/* Set aperture base/size for vesafb takeover */
 	info->apertures = dev_priv->apertures;
 	if (!info->apertures) {

drivers/gpu/drm/radeon/radeon_fb.c

@@ -247,8 +247,6 @@ static int radeonfb_create(struct radeon_fbdev *rfbdev,
 	info->apertures->ranges[0].base = rdev->ddev->mode_config.fb_base;
 	info->apertures->ranges[0].size = rdev->mc.real_vram_size;
 
-	info->fix.mmio_start = 0;
-	info->fix.mmio_len = 0;
 	info->pixmap.size = 64*1024;
 	info->pixmap.buf_align = 8;
 	info->pixmap.access_align = 32;

drivers/gpu/drm/vmwgfx/vmwgfx_fb.c

@@ -480,9 +480,6 @@ int vmw_fb_init(struct vmw_private *vmw_priv)
 	info->fix.smem_start = 0;
 	info->fix.smem_len = fb_size;
 
-	info->fix.mmio_start = 0;
-	info->fix.mmio_len = 0;
-
 	info->pseudo_palette = par->pseudo_palette;
 	info->screen_base = par->vmalloc;
 	info->screen_size = fb_size;