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 "fence.h"
  18 #include "intr.h"
  19
  20 struct host1x;
  21
  22 /* Reserved for replacing an expired wait with a NOP */
  23 #define HOST1X_SYNCPT_RESERVED                  0
  24
  25 struct host1x_syncpt_base {
  26         unsigned int id;
  27         bool requested;
  28 };
  29
  30 struct host1x_syncpt {
  31         struct kref ref;
  32
  33         unsigned int id;
  34         atomic_t min_val;
  35         atomic_t max_val;
  36         u32 base_val;
  37         const char *name;
  38         bool client_managed;
  39         struct host1x *host;
  40         struct host1x_syncpt_base *base;
  41
  42         /* interrupt data */
  43         struct host1x_fence_list fences;
  44
  45         /*
  46          * If a submission incrementing this syncpoint fails, lock it so that
  47          * further submission cannot be made until application has handled the
  48          * failure.
  49          */
  50         bool locked;
  51 };
  52
  53 /* Initialize sync point array  */
  54 int host1x_syncpt_init(struct host1x *host);
  55
  56 /*  Free sync point array */
  57 void host1x_syncpt_deinit(struct host1x *host);
  58
  59 /* Return number of sync point supported. */
  60 unsigned int host1x_syncpt_nb_pts(struct host1x *host);
  61
  62 /* Return number of wait bases supported. */
  63 unsigned int host1x_syncpt_nb_bases(struct host1x *host);
  64
  65 /* Return number of mlocks supported. */
  66 unsigned int host1x_syncpt_nb_mlocks(struct host1x *host);
  67
  68 /*
  69  * Check sync point sanity. If max is larger than min, there have too many
  70  * sync point increments.
  71  *
  72  * Client managed sync point are not tracked.
  73  * */
  74 static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real)
  75 {
  76         u32 max;
  77         if (sp->client_managed)
  78                 return true;
  79         max = host1x_syncpt_read_max(sp);
  80         return (s32)(max - real) >= 0;
  81 }
  82
  83 /* Return true if sync point is client managed. */
  84 static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp)
  85 {
  86         return sp->client_managed;
  87 }
  88
  89 /*
  90  * Returns true if syncpoint min == max, which means that there are no
  91  * outstanding operations.
  92  */
  93 static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp)
  94 {
  95         int min, max;
  96         smp_rmb();
  97         min = atomic_read(&sp->min_val);
  98         max = atomic_read(&sp->max_val);
  99         return (min == max);
 100 }
 101
 102 /* Load current value from hardware to the shadow register. */
 103 u32 host1x_syncpt_load(struct host1x_syncpt *sp);
 104
 105 /* Check if the given syncpoint value has already passed */
 106 bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
 107
 108 /* Save host1x sync point state into shadow registers. */
 109 void host1x_syncpt_save(struct host1x *host);
 110
 111 /* Reset host1x sync point state from shadow registers. */
 112 void host1x_syncpt_restore(struct host1x *host);
 113
 114 /* Read current wait base value into shadow register and return it. */
 115 u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
 116
 117 /* Indicate future operations by incrementing the sync point max. */
 118 u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
 119
 120 /* Check if sync point id is valid. */
 121 static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp)
 122 {
 123         return sp->id < host1x_syncpt_nb_pts(sp->host);
 124 }
 125
 126 static inline void host1x_syncpt_set_locked(struct host1x_syncpt *sp)
 127 {
 128         sp->locked = true;
 129 }
 130
 131 #endif