drivers/gpu/host1x/intr.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Tegra host1x Interrupt Management
   4  *
   5  * Copyright (c) 2010-2021, NVIDIA Corporation.
   6  */
   7
   8 #include <linux/clk.h>
   9
  10 #include "dev.h"
  11 #include "fence.h"
  12 #include "intr.h"
  13
  14 static void host1x_intr_add_fence_to_list(struct host1x_fence_list *list,
  15                                           struct host1x_syncpt_fence *fence)
  16 {
  17         struct host1x_syncpt_fence *fence_in_list;
  18
  19         list_for_each_entry_reverse(fence_in_list, &list->list, list) {
  20                 if ((s32)(fence_in_list->threshold - fence->threshold) <= 0) {
  21                         /* Fence in list is before us, we can insert here */
  22                         list_add(&fence->list, &fence_in_list->list);
  23                         return;
  24                 }
  25         }
  26
  27         /* Add as first in list */
  28         list_add(&fence->list, &list->list);
  29 }
  30
  31 static void host1x_intr_update_hw_state(struct host1x *host, struct host1x_syncpt *sp)
  32 {
  33         struct host1x_syncpt_fence *fence;
  34
  35         if (!list_empty(&sp->fences.list)) {
  36                 fence = list_first_entry(&sp->fences.list, struct host1x_syncpt_fence, list);
  37
  38                 host1x_hw_intr_set_syncpt_threshold(host, sp->id, fence->threshold);
  39                 host1x_hw_intr_enable_syncpt_intr(host, sp->id);
  40         } else {
  41                 host1x_hw_intr_disable_syncpt_intr(host, sp->id);
  42         }
  43 }
  44
  45 void host1x_intr_add_fence_locked(struct host1x *host, struct host1x_syncpt_fence *fence)
  46 {
  47         struct host1x_fence_list *fence_list = &fence->sp->fences;
  48
  49         INIT_LIST_HEAD(&fence->list);
  50
  51         host1x_intr_add_fence_to_list(fence_list, fence);
  52         host1x_intr_update_hw_state(host, fence->sp);
  53 }
  54
  55 bool host1x_intr_remove_fence(struct host1x *host, struct host1x_syncpt_fence *fence)
  56 {
  57         struct host1x_fence_list *fence_list = &fence->sp->fences;
  58         unsigned long irqflags;
  59
  60         spin_lock_irqsave(&fence_list->lock, irqflags);
  61
  62         if (list_empty(&fence->list)) {
  63                 spin_unlock_irqrestore(&fence_list->lock, irqflags);
  64                 return false;
  65         }
  66
  67         list_del_init(&fence->list);
  68         host1x_intr_update_hw_state(host, fence->sp);
  69
  70         spin_unlock_irqrestore(&fence_list->lock, irqflags);
  71
  72         return true;
  73 }
  74
  75 void host1x_intr_handle_interrupt(struct host1x *host, unsigned int id)
  76 {
  77         struct host1x_syncpt *sp = &host->syncpt[id];
  78         struct host1x_syncpt_fence *fence, *tmp;
  79         unsigned int value;
  80
  81         value = host1x_syncpt_load(sp);
  82
  83         spin_lock(&sp->fences.lock);
  84
  85         list_for_each_entry_safe(fence, tmp, &sp->fences.list, list) {
  86                 if (((value - fence->threshold) & 0x80000000U) != 0U) {
  87                         /* Fence is not yet expired, we are done */
  88                         break;
  89                 }
  90
  91                 list_del_init(&fence->list);
  92                 host1x_fence_signal(fence);
  93         }
  94
  95         /* Re-enable interrupt if necessary */
  96         host1x_intr_update_hw_state(host, sp);
  97
  98         spin_unlock(&sp->fences.lock);
  99 }
 100
 101 int host1x_intr_init(struct host1x *host)
 102 {
 103         unsigned int id;
 104
 105         mutex_init(&host->intr_mutex);
 106
 107         for (id = 0; id < host1x_syncpt_nb_pts(host); ++id) {
 108                 struct host1x_syncpt *syncpt = &host->syncpt[id];
 109
 110                 spin_lock_init(&syncpt->fences.lock);
 111                 INIT_LIST_HEAD(&syncpt->fences.list);
 112         }
 113
 114         return 0;
 115 }
 116
 117 void host1x_intr_deinit(struct host1x *host)
 118 {
 119 }
 120
 121 void host1x_intr_start(struct host1x *host)
 122 {
 123         u32 hz = clk_get_rate(host->clk);
 124         int err;
 125
 126         mutex_lock(&host->intr_mutex);
 127         err = host1x_hw_intr_init_host_sync(host, DIV_ROUND_UP(hz, 1000000));
 128         if (err) {
 129                 mutex_unlock(&host->intr_mutex);
 130                 return;
 131         }
 132         mutex_unlock(&host->intr_mutex);
 133 }
 134
 135 void host1x_intr_stop(struct host1x *host)
 136 {
 137         host1x_hw_intr_disable_all_syncpt_intrs(host);
 138 }