cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mdp5_smp.h (2800B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
      4 * Copyright (C) 2013 Red Hat
      5 * Author: Rob Clark <robdclark@gmail.com>
      6 */
      7
      8#ifndef __MDP5_SMP_H__
      9#define __MDP5_SMP_H__
     10
     11#include <drm/drm_print.h>
     12
     13#include "msm_drv.h"
     14
     15/*
     16 * SMP - Shared Memory Pool:
     17 *
     18 * SMP blocks are shared between all the clients, where each plane in
     19 * a scanout buffer is a SMP client.  Ie. scanout of 3 plane I420 on
     20 * pipe VIG0 => 3 clients: VIG0_Y, VIG0_CB, VIG0_CR.
     21 *
     22 * Based on the size of the attached scanout buffer, a certain # of
     23 * blocks must be allocated to that client out of the shared pool.
     24 *
     25 * In some hw, some blocks are statically allocated for certain pipes
     26 * and CANNOT be re-allocated (eg: MMB0 and MMB1 both tied to RGB0).
     27 *
     28 *
     29 * Atomic SMP State:
     30 *
     31 * On atomic updates that modify SMP configuration, the state is cloned
     32 * (copied) and modified.  For test-only, or in cases where atomic
     33 * update fails (or if we hit ww_mutex deadlock/backoff condition) the
     34 * new state is simply thrown away.
     35 *
     36 * Because the SMP registers are not double buffered, updates are a
     37 * two step process:
     38 *
     39 * 1) in _prepare_commit() we configure things (via read-modify-write)
     40 *    for the newly assigned pipes, so we don't take away blocks
     41 *    assigned to pipes that are still scanning out
     42 * 2) in _complete_commit(), after vblank/etc, we clear things for the
     43 *    released clients, since at that point old pipes are no longer
     44 *    scanning out.
     45 */
     46struct mdp5_smp_state {
     47	/* global state of what blocks are in use: */
     48	mdp5_smp_state_t state;
     49
     50	/* per client state of what blocks they are using: */
     51	mdp5_smp_state_t client_state[MAX_CLIENTS];
     52
     53	/* assigned pipes (hw updated at _prepare_commit()): */
     54	unsigned long assigned;
     55
     56	/* released pipes (hw updated at _complete_commit()): */
     57	unsigned long released;
     58};
     59
     60struct mdp5_kms;
     61struct mdp5_smp;
     62
     63/*
     64 * SMP module prototypes:
     65 * mdp5_smp_init() returns a SMP @handler,
     66 * which is then used to call the other mdp5_smp_*(handler, ...) functions.
     67 */
     68
     69struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms,
     70		const struct mdp5_smp_block *cfg);
     71void  mdp5_smp_destroy(struct mdp5_smp *smp);
     72
     73void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p);
     74
     75uint32_t mdp5_smp_calculate(struct mdp5_smp *smp,
     76		const struct mdp_format *format,
     77		u32 width, bool hdecim);
     78
     79int mdp5_smp_assign(struct mdp5_smp *smp, struct mdp5_smp_state *state,
     80		enum mdp5_pipe pipe, uint32_t blkcfg);
     81void mdp5_smp_release(struct mdp5_smp *smp, struct mdp5_smp_state *state,
     82		enum mdp5_pipe pipe);
     83
     84void mdp5_smp_prepare_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state);
     85void mdp5_smp_complete_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state);
     86
     87#endif /* __MDP5_SMP_H__ */