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path: root/drivers/gpu/drm/vc4/vc4_bo.c
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Diffstat (limited to 'drivers/gpu/drm/vc4/vc4_bo.c')
-rw-r--r--drivers/gpu/drm/vc4/vc4_bo.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c
new file mode 100644
index 000000000000..ab9f5108ae1a
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_bo.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright © 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* DOC: VC4 GEM BO management support.
+ *
+ * The VC4 GPU architecture (both scanout and rendering) has direct
+ * access to system memory with no MMU in between. To support it, we
+ * use the GEM CMA helper functions to allocate contiguous ranges of
+ * physical memory for our BOs.
+ */
+
+#include "vc4_drv.h"
+
+struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size)
+{
+ struct drm_gem_cma_object *cma_obj;
+
+ cma_obj = drm_gem_cma_create(dev, size);
+ if (IS_ERR(cma_obj))
+ return NULL;
+ else
+ return to_vc4_bo(&cma_obj->base);
+}
+
+int vc4_dumb_create(struct drm_file *file_priv,
+ struct drm_device *dev,
+ struct drm_mode_create_dumb *args)
+{
+ int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+ struct vc4_bo *bo = NULL;
+ int ret;
+
+ if (args->pitch < min_pitch)
+ args->pitch = min_pitch;
+
+ if (args->size < args->pitch * args->height)
+ args->size = args->pitch * args->height;
+
+ bo = vc4_bo_create(dev, roundup(args->size, PAGE_SIZE));
+ if (!bo)
+ return -ENOMEM;
+
+ ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
+ drm_gem_object_unreference_unlocked(&bo->base.base);
+
+ return ret;
+}