gma500: add the ability to request backed space or not

We will will need this for doing a GEM allocator. It should also avoid any
crashes with the current code if the stolen area is too small.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/gma500/psb_fb.c b/drivers/staging/gma500/psb_fb.c
index 0bad4e09abad6bf9f5b67bcd04472015374a43a6..e06365b0d101ceb09c64cef5067627a35e20226c 100644 (file)
--- a/drivers/staging/gma500/psb_fb.c
+++ b/drivers/staging/gma500/psb_fb.c
@@ -479,8 +479,8 @@ static int psbfb_create(struct psb_fbdev *fbdev,
        size = mode_cmd.pitch * mode_cmd.height;
        aligned_size = ALIGN(size, PAGE_SIZE);
 
-       /* Allocate the framebuffer in the GTT */
-       backing = psb_gtt_alloc_range(dev, aligned_size, "fb");
+       /* Allocate the framebuffer in the GTT with stolen page backing */
+       backing = psb_gtt_alloc_range(dev, aligned_size, "fb", 1);
        if (backing == NULL)
                return -ENOMEM;
 

diff --git a/drivers/staging/gma500/psb_gtt.c b/drivers/staging/gma500/psb_gtt.c
index a97e7beefc17957421a2cfc62d08582b8ade6d00..69323f93dea2f00df1a8267683a66b7672993fdf 100644 (file)
--- a/drivers/staging/gma500/psb_gtt.c
+++ b/drivers/staging/gma500/psb_gtt.c
@@ -972,6 +972,7 @@ struct gtt_range *psb_gtt_lookup_handle(struct drm_device *dev, int handle)
  *     @dev: Our DRM device
  *     @len: length (bytes) of address space required
  *     @name: resource name
+ *     @backed: resource should be backed by stolen pages
  *
  *     Ask the kernel core to find us a suitable range of addresses
  *     to use for a GTT mapping.
@@ -981,12 +982,23 @@ struct gtt_range *psb_gtt_lookup_handle(struct drm_device *dev, int handle)
  *     as in use.
  */
 struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
-                                                       const char *name)
+                                               const char *name, int backed)
 {
        struct drm_psb_private *dev_priv = dev->dev_private;
        struct gtt_range *gt;
        struct resource *r = dev_priv->gtt_mem;
        int ret;
+       unsigned long start, end;
+       
+       if (backed) {
+               /* The start of the GTT is the stolen pages */
+               start = r->start;
+               end = r->start + dev_priv->pg->stolen_size - 1;
+        } else {
+                /* The rest we will use for GEM backed objects */
+                start = r->start + dev_priv->pg->stolen_size;
+                end = -1;
+        }
 
        gt = kzalloc(sizeof(struct gtt_range), GFP_KERNEL);
        if (gt == NULL)
@@ -996,8 +1008,7 @@ struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
        kref_init(&gt->kref);
 
        ret = allocate_resource(dev_priv->gtt_mem, &gt->resource,
-                               len, 0, -1, /*r->start, r->end - 1, */
-                               PAGE_SIZE, NULL, NULL);
+                               len, start, end, PAGE_SIZE, NULL, NULL);
        if (ret == 0) {
                gt->offset = gt->resource.start - r->start;
                return gt;

diff --git a/drivers/staging/gma500/psb_gtt.h b/drivers/staging/gma500/psb_gtt.h
index 010ef702c52367519f3d5685cd256e92ef7a11fc..dc2259c895e36e7ef5091fde7e2ac1316590fca7 100644 (file)
--- a/drivers/staging/gma500/psb_gtt.h
+++ b/drivers/staging/gma500/psb_gtt.h
@@ -105,7 +105,7 @@ extern int psb_gtt_release_handle(struct drm_device *dev, struct gtt_range *gt);
 extern struct gtt_range *psb_gtt_lookup_handle(struct drm_device *dev,
                                                        int handle);
 extern struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
-                                                       const char *name);
+                                               const char *name, int backed);
 extern void psb_gtt_kref_put(struct gtt_range *gt);
 extern void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt);