drm/msm: Add private interface for adreno-smmu

// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (C) 2020 Google, Inc

 */

#ifndef __ADRENO_SMMU_PRIV_H

#define __ADRENO_SMMU_PRIV_H

#include <linux/io-pgtable.h>

/**

 * struct adreno_smmu_priv - private interface between adreno-smmu and GPU

 *

 * @cookie:        An opque token provided by adreno-smmu and passed

 *                 back into the callbacks

 * @get_ttbr1_cfg: Get the TTBR1 config for the GPUs context-bank

 * @set_ttbr0_cfg: Set the TTBR0 config for the GPUs context bank.  A

 *                 NULL config disables TTBR0 translation, otherwise

 *                 TTBR0 translation is enabled with the specified cfg

 *

 * The GPU driver (drm/msm) and adreno-smmu work together for controlling

 * the GPU's SMMU instance.  This is by necessity, as the GPU is directly

 * updating the SMMU for context switches, while on the other hand we do

 * not want to duplicate all of the initial setup logic from arm-smmu.

 *

 * This private interface is used for the two drivers to coordinate.  The

 * cookie and callback functions are populated when the GPU driver attaches

 * it's domain.

 */

struct adreno_smmu_priv {

    const void *cookie;

    const struct io_pgtable_cfg *(*get_ttbr1_cfg)(const void *cookie);

    int (*set_ttbr0_cfg)(const void *cookie, const struct io_pgtable_cfg *cfg);

};

#endif /* __ADRENO_SMMU_PRIV_H */

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