drivers/gpu/host1x/cdma.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Tegra host1x Command DMA
   4  *
   5  * Copyright (c) 2010-2013, NVIDIA Corporation.
   6  */
   7
   8 #ifndef __HOST1X_CDMA_H
   9 #define __HOST1X_CDMA_H
  10
  11 #include <linux/sched.h>
  12 #include <linux/completion.h>
  13 #include <linux/list.h>
  14
  15 struct host1x_syncpt;
  16 struct host1x_userctx_timeout;
  17 struct host1x_job;
  18
  19 /*
  20  * cdma
  21  *
  22  * This is in charge of a host command DMA channel.
  23  * Sends ops to a push buffer, and takes responsibility for unpinning
  24  * (& possibly freeing) of memory after those ops have completed.
  25  * Producer:
  26  *      begin
  27  *              push - send ops to the push buffer
  28  *      end - start command DMA and enqueue handles to be unpinned
  29  * Consumer:
  30  *      update - call to update sync queue and push buffer, unpin memory
  31  */
  32
  33 struct push_buffer {
  34         void *mapped;                   /* mapped pushbuffer memory */
  35         dma_addr_t dma;                 /* device address of pushbuffer */
  36         dma_addr_t phys;                /* physical address of pushbuffer */
  37         u32 fence;                      /* index we've written */
  38         u32 pos;                        /* index to write to */
  39         u32 size;
  40         u32 alloc_size;
  41 };
  42
  43 struct buffer_timeout {
  44         struct delayed_work wq;         /* work queue */
  45         bool initialized;               /* timer one-time setup flag */
  46         struct host1x_syncpt *syncpt;   /* buffer completion syncpt */
  47         u32 syncpt_val;                 /* syncpt value when completed */
  48         ktime_t start_ktime;            /* starting time */
  49         /* context timeout information */
  50         struct host1x_client *client;
  51 };
  52
  53 enum cdma_event {
  54         CDMA_EVENT_NONE,                /* not waiting for any event */
  55         CDMA_EVENT_SYNC_QUEUE_EMPTY,    /* wait for empty sync queue */
  56         CDMA_EVENT_PUSH_BUFFER_SPACE    /* wait for space in push buffer */
  57 };
  58
  59 struct host1x_cdma {
  60         struct mutex lock;              /* controls access to shared state */
  61         struct completion complete;     /* signalled when event occurs */
  62         enum cdma_event event;          /* event that complete is waiting for */
  63         unsigned int slots_used;        /* pb slots used in current submit */
  64         unsigned int slots_free;        /* pb slots free in current submit */
  65         unsigned int first_get;         /* DMAGET value, where submit begins */
  66         unsigned int last_pos;          /* last value written to DMAPUT */
  67         struct push_buffer push_buffer; /* channel's push buffer */
  68         struct list_head sync_queue;    /* job queue */
  69         struct buffer_timeout timeout;  /* channel's timeout state/wq */
  70         bool running;
  71         bool torndown;
  72 };
  73
  74 #define cdma_to_channel(cdma) container_of(cdma, struct host1x_channel, cdma)
  75 #define cdma_to_host1x(cdma) dev_get_drvdata(cdma_to_channel(cdma)->dev->parent)
  76 #define pb_to_cdma(pb) container_of(pb, struct host1x_cdma, push_buffer)
  77
  78 int host1x_cdma_init(struct host1x_cdma *cdma);
  79 int host1x_cdma_deinit(struct host1x_cdma *cdma);
  80 int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job);
  81 void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2);
  82 void host1x_cdma_push_wide(struct host1x_cdma *cdma, u32 op1, u32 op2,
  83                            u32 op3, u32 op4);
  84 void host1x_cdma_end(struct host1x_cdma *cdma, struct host1x_job *job);
  85 void host1x_cdma_update(struct host1x_cdma *cdma);
  86 void host1x_cdma_peek(struct host1x_cdma *cdma, u32 dmaget, int slot,
  87                       u32 *out);
  88 unsigned int host1x_cdma_wait_locked(struct host1x_cdma *cdma,
  89                                      enum cdma_event event);
  90 void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,
  91                                    struct device *dev);
  92 #endif