Revert "drm/omap: add OMAP_BO flags to affect buffer allocation"

This reverts commit 23b48225.

This patch does not have an acceptable open source userspace
implementation, and as such it does not meet the requirements for adding
new UAPI.

Discussion is in the Link.

Link: https://lists.freedesktop.org/archives/dri-devel/2019-October/240586.html
Fixes: 23b48225 ("drm/omap: add OMAP_BO flags to affect buffer allocation")
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Jean-Jacques Hiblot <jjhiblot@ti.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191022204733.235801-1-sean@poorly.run

drivers/gpu/drm/omapdrm/omap_gem.c

@@ -1097,9 +1097,6 @@ void omap_gem_free_object(struct drm_gem_object *obj)
 	list_del(&omap_obj->mm_list);
 	mutex_unlock(&priv->list_lock);
 
-	if (omap_obj->flags & OMAP_BO_MEM_PIN)
-		omap_gem_unpin_locked(obj);
-
 	/*
 	 * We own the sole reference to the object at this point, but to keep
 	 * lockdep happy, we must still take the omap_obj_lock to call
@@ -1150,19 +1147,10 @@ static bool omap_gem_validate_flags(struct drm_device *dev, u32 flags)
 		return false;
 	}
 
-	if ((flags & OMAP_BO_MEM_CONTIG) && (flags & OMAP_BO_MEM_DMM))
-		return false;
-
-	if ((flags & OMAP_BO_MEM_DMM) && !priv->usergart)
-		return false;
-
 	if (flags & OMAP_BO_TILED_MASK) {
 		if (!priv->usergart)
 			return false;
 
-		if (flags & OMAP_BO_MEM_CONTIG)
-			return false;
-
 		switch (flags & OMAP_BO_TILED_MASK) {
 		case OMAP_BO_TILED_8:
 		case OMAP_BO_TILED_16:
@@ -1177,34 +1165,7 @@ static bool omap_gem_validate_flags(struct drm_device *dev, u32 flags)
 	return true;
 }
 
-/**
- * omap_gem_new() - Create a new GEM buffer
- * @dev: The DRM device
- * @gsize: The requested size for the GEM buffer. If the buffer is tiled
- *         (2D buffer), the size is a pair of values: height and width
- *         expressed in pixels. If the buffers is not tiled, it is expressed
- *         in bytes.
- * @flags: Flags give additionnal information about the allocation:
- *         OMAP_BO_TILED_x: use the TILER (2D buffers). The TILER container
- *              unit can be 8, 16 or 32 bits. Cache is always disabled for
- *              tiled buffers.
- *         OMAP_BO_SCANOUT: Scannout buffer, consummable by the DSS
- *         OMAP_BO_CACHED: Buffer CPU caching mode: cached
- *         OMAP_BO_WC: Buffer CPU caching mode: write-combined
- *         OMAP_BO_UNCACHED: Buffer CPU caching mode: uncached
- *         OMAP_BO_MEM_CONTIG: The driver will use dma_alloc to get the memory.
- *              This can be used to avoid DMM if the userspace knows it needs
- *              more than 128M of memory at the same time.
- *         OMAP_BO_MEM_DMM: The driver will use DMM to get the memory. There's
- *              not much use for this flag at the moment, as on platforms with
- *              DMM it is used by default, but it's here for completeness.
- *         OMAP_BO_MEM_PIN: The driver will pin the memory at alloc time, and
- *              keep it pinned. This can be used to 1) get an error at alloc
- *              time if DMM space is full, and 2) get rid of the constant
- *              pin/unpin operations which may have some effect on performance.
- *
- * Return: The GEM buffer or NULL if the allocation failed
- */
+/* GEM buffer object constructor */
 struct drm_gem_object *omap_gem_new(struct drm_device *dev,
 		union omap_gem_size gsize, u32 flags)
 {
@@ -1232,8 +1193,7 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev,
 		 */
 		flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED);
 		flags |= tiler_get_cpu_cache_flags();
-	} else if ((flags & OMAP_BO_MEM_CONTIG) ||
-		((flags & OMAP_BO_SCANOUT) && !priv->has_dmm)) {
+	} else if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) {
 		/*
 		 * If we don't have DMM, we must allocate scanout buffers
 		 * from contiguous DMA memory.
@@ -1293,22 +1253,12 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev,
 			goto err_release;
 	}
 
-	if (flags & OMAP_BO_MEM_PIN) {
-		ret = omap_gem_pin(obj, NULL);
-		if (ret)
-			goto err_free_dma;
-	}
-
 	mutex_lock(&priv->list_lock);
 	list_add(&omap_obj->mm_list, &priv->obj_list);
 	mutex_unlock(&priv->list_lock);
 
 	return obj;
 
-err_free_dma:
-	if (flags & OMAP_BO_MEM_DMA_API)
-		dma_free_wc(dev->dev, size, omap_obj->vaddr,
-			    omap_obj->dma_addr);
 err_release:
 	drm_gem_object_release(obj);
 err_free:

include/uapi/drm/omap_drm.h

@@ -47,15 +47,6 @@ struct drm_omap_param {
 #define OMAP_BO_UNCACHED	0x00000004
 #define OMAP_BO_CACHE_MASK	0x00000006
 
-/* Force allocation from contiguous DMA memory */
-#define OMAP_BO_MEM_CONTIG	0x00000008
-
-/* Force allocation via DMM */
-#define OMAP_BO_MEM_DMM		0x00000010
-
-/* Pin the buffer when allocating and keep pinned */
-#define OMAP_BO_MEM_PIN		0x00000020
-
 /* Use TILER for the buffer. The TILER container unit can be 8, 16 or 32 bits. */
 #define OMAP_BO_TILED_8		0x00000100
 #define OMAP_BO_TILED_16	0x00000200