linux/drivers/gpu/host1x/intr.h
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   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Tegra host1x Interrupt Management
   4 *
   5 * Copyright (c) 2010-2013, NVIDIA Corporation.
   6 */
   7
   8#ifndef __HOST1X_INTR_H
   9#define __HOST1X_INTR_H
  10
  11#include <linux/interrupt.h>
  12#include <linux/workqueue.h>
  13
  14struct host1x_syncpt;
  15struct host1x;
  16
  17enum host1x_intr_action {
  18        /*
  19         * Perform cleanup after a submit has completed.
  20         * 'data' points to a channel
  21         */
  22        HOST1X_INTR_ACTION_SUBMIT_COMPLETE = 0,
  23
  24        /*
  25         * Wake up a  task.
  26         * 'data' points to a wait_queue_head_t
  27         */
  28        HOST1X_INTR_ACTION_WAKEUP,
  29
  30        /*
  31         * Wake up a interruptible task.
  32         * 'data' points to a wait_queue_head_t
  33         */
  34        HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
  35
  36        HOST1X_INTR_ACTION_COUNT
  37};
  38
  39struct host1x_syncpt_intr {
  40        spinlock_t lock;
  41        struct list_head wait_head;
  42        char thresh_irq_name[12];
  43        struct work_struct work;
  44};
  45
  46struct host1x_waitlist {
  47        struct list_head list;
  48        struct kref refcount;
  49        u32 thresh;
  50        enum host1x_intr_action action;
  51        atomic_t state;
  52        void *data;
  53        int count;
  54};
  55
  56/*
  57 * Schedule an action to be taken when a sync point reaches the given threshold.
  58 *
  59 * @id the sync point
  60 * @thresh the threshold
  61 * @action the action to take
  62 * @data a pointer to extra data depending on action, see above
  63 * @waiter waiter structure - assumes ownership
  64 * @ref must be passed if cancellation is possible, else NULL
  65 *
  66 * This is a non-blocking api.
  67 */
  68int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt,
  69                           u32 thresh, enum host1x_intr_action action,
  70                           void *data, struct host1x_waitlist *waiter,
  71                           void **ref);
  72
  73/*
  74 * Unreference an action submitted to host1x_intr_add_action().
  75 * You must call this if you passed non-NULL as ref.
  76 * @ref the ref returned from host1x_intr_add_action()
  77 * @flush wait until any pending handlers have completed before returning.
  78 */
  79void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref,
  80                         bool flush);
  81
  82/* Initialize host1x sync point interrupt */
  83int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
  84
  85/* Deinitialize host1x sync point interrupt */
  86void host1x_intr_deinit(struct host1x *host);
  87
  88/* Enable host1x sync point interrupt */
  89void host1x_intr_start(struct host1x *host);
  90
  91/* Disable host1x sync point interrupt */
  92void host1x_intr_stop(struct host1x *host);
  93
  94irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
  95#endif
  96
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