With the patch, we reserve 2x 16 KiB at the high end of video memory, with each frame aligned to an 8-byte boundary. The remaining memory is available for GEM VRAM buffer objects.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de --- drivers/gpu/drm/ast/ast_ttm.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/ast/ast_ttm.c b/drivers/gpu/drm/ast/ast_ttm.c index fad34106083a..8e6a1d8917d0 100644 --- a/drivers/gpu/drm/ast/ast_ttm.c +++ b/drivers/gpu/drm/ast/ast_ttm.c @@ -35,13 +35,20 @@
int ast_mm_init(struct ast_private *ast) { + unsigned long cursor_size; struct drm_vram_mm *vmm; int ret; struct drm_device *dev = ast->dev;
- vmm = drm_vram_helper_alloc_mm( - dev, pci_resource_start(dev->pdev, 0), - ast->vram_size); + /* At the high end of video memory, we reserve space for + * two cursor images. The cursor plane uses this memory to + * store a double-buffered image of the current cursor. + */ + cursor_size = roundup((AST_HWC_SIZE + AST_HWC_SIGNATURE_SIZE), + PAGE_SIZE) * AST_DEFAULT_HWC_NUM; + + vmm = drm_vram_helper_alloc_mm(dev, pci_resource_start(dev->pdev, 0), + ast->vram_size - cursor_size); if (IS_ERR(vmm)) { ret = PTR_ERR(vmm); DRM_ERROR("Error initializing VRAM MM; %d\n", ret);