LXR linux/drivers/gpu/host1x/syncpt.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Tegra host1x Syncpoints
   4 *
   5 * Copyright (c) 2010-2013, NVIDIA Corporation.
   6 */
   7
   8#ifndef __HOST1X_SYNCPT_H
   9#define __HOST1X_SYNCPT_H
  10
  11#include <linux/atomic.h>
  12#include <linux/host1x.h>
  13#include <linux/kernel.h>
  14#include <linux/kref.h>
  15#include <linux/sched.h>
  16
  17#include "intr.h"
  18
  19struct host1x;
  20
  21/* Reserved for replacing an expired wait with a NOP */
  22#define HOST1X_SYNCPT_RESERVED                  0
  23
  24struct host1x_syncpt_base {
  25        unsigned int id;
  26        bool requested;
  27};
  28
  29struct host1x_syncpt {
  30        struct kref ref;
  31
  32        unsigned int id;
  33        atomic_t min_val;
  34        atomic_t max_val;
  35        u32 base_val;
  36        const char *name;
  37        bool client_managed;
  38        struct host1x *host;
  39        struct host1x_syncpt_base *base;
  40
  41        /* interrupt data */
  42        struct host1x_syncpt_intr intr;
  43};
  44
  45/* Initialize sync point array  */
  46int host1x_syncpt_init(struct host1x *host);
  47
  48/*  Free sync point array */
  49void host1x_syncpt_deinit(struct host1x *host);
  50
  51/* Return number of sync point supported. */
  52unsigned int host1x_syncpt_nb_pts(struct host1x *host);
  53
  54/* Return number of wait bases supported. */
  55unsigned int host1x_syncpt_nb_bases(struct host1x *host);
  56
  57/* Return number of mlocks supported. */
  58unsigned int host1x_syncpt_nb_mlocks(struct host1x *host);
  59
  60/*
  61 * Check sync point sanity. If max is larger than min, there have too many
  62 * sync point increments.
  63 *
  64 * Client managed sync point are not tracked.
  65 * */
  66static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real)
  67{
  68        u32 max;
  69        if (sp->client_managed)
  70                return true;
  71        max = host1x_syncpt_read_max(sp);
  72        return (s32)(max - real) >= 0;
  73}
  74
  75/* Return true if sync point is client managed. */
  76static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp)
  77{
  78        return sp->client_managed;
  79}
  80
  81/*
  82 * Returns true if syncpoint min == max, which means that there are no
  83 * outstanding operations.
  84 */
  85static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp)
  86{
  87        int min, max;
  88        smp_rmb();
  89        min = atomic_read(&sp->min_val);
  90        max = atomic_read(&sp->max_val);
  91        return (min == max);
  92}
  93
  94/* Load current value from hardware to the shadow register. */
  95u32 host1x_syncpt_load(struct host1x_syncpt *sp);
  96
  97/* Check if the given syncpoint value has already passed */
  98bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
  99
 100/* Save host1x sync point state into shadow registers. */
 101void host1x_syncpt_save(struct host1x *host);
 102
 103/* Reset host1x sync point state from shadow registers. */
 104void host1x_syncpt_restore(struct host1x *host);
 105
 106/* Read current wait base value into shadow register and return it. */
 107u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
 108
 109/* Indicate future operations by incrementing the sync point max. */
 110u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
 111
 112/* Check if sync point id is valid. */
 113static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp)
 114{
 115        return sp->id < host1x_syncpt_nb_pts(sp->host);
 116}
 117
 118#endif
 119