drivers/gpu/host1x/intr.h

   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
  14 struct host1x_syncpt;
  15 struct host1x;
  16
  17 enum 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
  39 struct 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
  46 struct 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  */
  68 int 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  */
  78 void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref);
  79
  80 /* Initialize host1x sync point interrupt */
  81 int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
  82
  83 /* Deinitialize host1x sync point interrupt */
  84 void host1x_intr_deinit(struct host1x *host);
  85
  86 /* Enable host1x sync point interrupt */
  87 void host1x_intr_start(struct host1x *host);
  88
  89 /* Disable host1x sync point interrupt */
  90 void host1x_intr_stop(struct host1x *host);
  91
  92 irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
  93 #endif