/*
 * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include <nvgpu/ltc.h>
#include <nvgpu/dma.h>
#include <nvgpu/nvgpu_mem.h>
#include <nvgpu/gk20a.h>

#include "gk20a/gr_gk20a.h"

int nvgpu_ltc_alloc_cbc(struct gk20a *g, size_t compbit_backing_size,
			bool vidmem_alloc)
{
	struct gr_gk20a *gr = &g->gr;
	unsigned long flags = 0;

	if (nvgpu_mem_is_valid(&gr->compbit_store.mem))
		return 0;

	if (vidmem_alloc) {
		/*
		 * Backing store MUST be physically contiguous and allocated in
		 * one chunk
		 * Vidmem allocation API does not support FORCE_CONTIGUOUS like
		 * flag to allocate contiguous memory
		 * But this allocation will happen in vidmem bootstrap allocator
		 * which always allocates contiguous memory
		 */
		return nvgpu_dma_alloc_vid(g,
					 compbit_backing_size,
					 &gr->compbit_store.mem);
	} else {
		if (!nvgpu_iommuable(g))
			flags = NVGPU_DMA_FORCE_CONTIGUOUS;

		return nvgpu_dma_alloc_flags_sys(g,
					 flags,
					 compbit_backing_size,
					 &gr->compbit_store.mem);
	}
}