/* Check pitch constriants for all chips & tiling formats */
static bool
i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode)
{
int tile_width;
/* Linear is always fine */
if (tiling_mode == I915_TILING_NONE)
return true;
if (!IS_I9XX(dev) ||
(tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev)))
tile_width = 128;
else
tile_width = 512;
/* check maximum stride & object size */
if (IS_I965G(dev)) {
/* i965 stores the end address of the gtt mapping in the fence
* reg, so dont bother to check the size */
if (stride / 128 > I965_FENCE_MAX_PITCH_VAL)
return false;
} else if (IS_I9XX(dev)) {
uint32_t pitch_val = ffs(stride / tile_width) - 1;
/* XXX: For Y tiling, FENCE_MAX_PITCH_VAL is actually 6 (8KB)
* instead of 4 (2KB) on 945s.
*/
if (pitch_val > I915_FENCE_MAX_PITCH_VAL ||
size > (I830_FENCE_MAX_SIZE_VAL << 20))
return false;
} else {
uint32_t pitch_val = ffs(stride / tile_width) - 1;
if (pitch_val > I830_FENCE_MAX_PITCH_VAL ||
size > (I830_FENCE_MAX_SIZE_VAL << 19))
return false;
}
/* 965+ just needs multiples of tile width */
if (IS_I965G(dev)) {
if (stride & (tile_width - 1))
return false;
return true;
}
/* Pre-965 needs power of two tile widths */
if (stride < tile_width)
return false;
if (stride & (stride - 1))
return false;
/* We don't 0handle the aperture area covered by the fence being bigger
* than the object size.
*/
if (i915_get_fence_size(dev, size) != size)
return false;
return true;
}
/* Check pitch constriants for all chips & tiling formats */
static int
i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode)
{
int tile_width;
/* Linear is always fine */
if (tiling_mode == I915_TILING_NONE)
return 1;
if (tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev))
tile_width = 128;
else
tile_width = 512;
if (stride == 0)
return 0;
/* 965+ just needs multiples of tile width */
if (IS_I965G(dev)) {
if (stride & (tile_width - 1))
return 0;
return 1;
}
/* Pre-965 needs power of two tile widths */
if (stride < tile_width)
return 0;
if (!ISP2(stride))
return 0;
/* We don't handle the aperture area covered by the fence being bigger
* than the object size.
*/
if (i915_get_fence_size(dev, size) != size)
return 0;
return 1;
}
