gma500: kill virtual mapping support

This isn't actually usable - we simply don't have the vmap space on a 32bit
system to do this stunt. Instead we will rely on the low level drivers
limiting the console resolution as before.

The real fix is for someone to write a page table aware version of the
framebuffer console blit functions. Good university student project
perhaps..

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/gma500/framebuffer.c b/drivers/gpu/drm/gma500/framebuffer.c
index 171c4419b7f682016a0bc9b8eff221a5647d4e40..867a04722b05f04c4de2bd64ba04c7e3b5346349 100644 (file)
--- a/drivers/gpu/drm/gma500/framebuffer.c
+++ b/drivers/gpu/drm/gma500/framebuffer.c
@@ -309,13 +309,10 @@ static struct drm_framebuffer *psb_framebuffer_create
  *
  *     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
- *     stolen memory or the system has no stolen memory we allocate a range
- *     and back it with a GEM object.
+ *     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.
  *
- *     In this case the GEM object has no handle.
- *
- *     FIXME: console speed up - allocate twice the space if room and use
- *     hardware scrolling for acceleration.
+ *     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)
 {
@@ -328,17 +325,7 @@ static struct gtt_range *psbfb_alloc(struct drm_device *dev, int aligned_size)
                        return backing;
                psb_gtt_free_range(dev, backing);
        }
-       /* Next try using GEM host memory */
-       backing = psb_gtt_alloc_range(dev, aligned_size, "fb(gem)", 0);
-       if (backing == NULL)
-               return NULL;
-
-       /* Now back it with an object */
-       if (drm_gem_object_init(dev, &backing->gem, aligned_size) != 0) {
-               psb_gtt_free_range(dev, backing);
-               return NULL;
-       }
-       return backing;
+       return NULL;
 }
 
 /**
@@ -422,22 +409,9 @@ static int psbfb_create(struct psb_fbdev *fbdev,
        info->fix.smem_start = dev->mode_config.fb_base;
        info->fix.smem_len = size;
 
-       if (backing->stolen) {
-               /* Accessed stolen memory directly */
-               info->screen_base = (char *)dev_priv->vram_addr +
+       /* Accessed stolen memory directly */
+       info->screen_base = (char *)dev_priv->vram_addr +
                                                        backing->offset;
-       } else {
-               /* Pin the pages into the GTT and create a mapping to them */
-               psb_gtt_pin(backing);
-               info->screen_base = vm_map_ram(backing->pages, backing->npage,
-                               -1, PAGE_KERNEL);
-               if (info->screen_base == NULL) {
-                       psb_gtt_unpin(backing);
-                       ret = -ENOMEM;
-                       goto out_unref;
-               }
-               psbfb->vm_map = 1;
-       }
        info->screen_size = size;
 
        if (dev_priv->gtt.stolen_size) {
@@ -471,11 +445,8 @@ static int psbfb_create(struct psb_fbdev *fbdev,
 out_unref:
        if (backing->stolen)
                psb_gtt_free_range(dev, backing);
-       else {
-               if (psbfb->vm_map)
-                       vm_unmap_ram(info->screen_base, backing->npage);
+       else
                drm_gem_object_unreference(&backing->gem);
-       }
 out_err1:
        mutex_unlock(&dev->struct_mutex);
        psb_gtt_free_range(dev, backing);
@@ -549,13 +520,6 @@ int psb_fbdev_destroy(struct drm_device *dev, struct psb_fbdev *fbdev)
 
        if (fbdev->psb_fb_helper.fbdev) {
                info = fbdev->psb_fb_helper.fbdev;
-
-               /* If this is our base framebuffer then kill any virtual map
-                  for the framebuffer layer and unpin it */
-               if (psbfb->vm_map) {
-                       vm_unmap_ram(info->screen_base, psbfb->gtt->npage);
-                       psb_gtt_unpin(psbfb->gtt);
-               }
                unregister_framebuffer(info);
                if (info->cmap.len)
                        fb_dealloc_cmap(&info->cmap);
@@ -765,7 +729,7 @@ void psb_modeset_init(struct drm_device *dev)
        dev->mode_config.funcs = (void *) &psb_mode_funcs;
 
        /* set memory base */
-       /* MRST and PSB should use BAR 2*/
+       /* Oaktrail and Poulsbo should use BAR 2*/
        pci_read_config_dword(dev->pdev, PSB_BSM, (u32 *)
                                        &(dev->mode_config.fb_base));
 

diff --git a/drivers/gpu/drm/gma500/framebuffer.h b/drivers/gpu/drm/gma500/framebuffer.h
index d1b2289447f0b04121bbc1c0cd8db2b6d2016391..989558a9e6eec520d8a53fa0b53b3ef7dbd962a2 100644 (file)
--- a/drivers/gpu/drm/gma500/framebuffer.h
+++ b/drivers/gpu/drm/gma500/framebuffer.h
@@ -32,7 +32,6 @@ struct psb_framebuffer {
        struct address_space *addr_space;
        struct fb_info *fbdev;
        struct gtt_range *gtt;
-       bool vm_map;            /* True if we must undo a vm_map_ram */
 };
 
 struct psb_fbdev {