LXR linux/drivers/gpu/host1x/cdma.h

   1/*
   2 * Tegra host1x Command DMA
   3 *
   4 * Copyright (c) 2010-2013, NVIDIA Corporation.
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms and conditions of the GNU General Public License,
   8 * version 2, as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope it will be useful, but WITHOUT
  11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13 * more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19#ifndef __HOST1X_CDMA_H
  20#define __HOST1X_CDMA_H
  21
  22#include <linux/sched.h>
  23#include <linux/semaphore.h>
  24#include <linux/list.h>
  25
  26struct host1x_syncpt;
  27struct host1x_userctx_timeout;
  28struct host1x_job;
  29
  30/*
  31 * cdma
  32 *
  33 * This is in charge of a host command DMA channel.
  34 * Sends ops to a push buffer, and takes responsibility for unpinning
  35 * (& possibly freeing) of memory after those ops have completed.
  36 * Producer:
  37 *      begin
  38 *              push - send ops to the push buffer
  39 *      end - start command DMA and enqueue handles to be unpinned
  40 * Consumer:
  41 *      update - call to update sync queue and push buffer, unpin memory
  42 */
  43
  44struct push_buffer {
  45        void *mapped;                   /* mapped pushbuffer memory */
  46        dma_addr_t phys;                /* physical address of pushbuffer */
  47        u32 fence;                      /* index we've written */
  48        u32 pos;                        /* index to write to */
  49        u32 size_bytes;
  50};
  51
  52struct buffer_timeout {
  53        struct delayed_work wq;         /* work queue */
  54        bool initialized;               /* timer one-time setup flag */
  55        struct host1x_syncpt *syncpt;   /* buffer completion syncpt */
  56        u32 syncpt_val;                 /* syncpt value when completed */
  57        ktime_t start_ktime;            /* starting time */
  58        /* context timeout information */
  59        int client;
  60};
  61
  62enum cdma_event {
  63        CDMA_EVENT_NONE,                /* not waiting for any event */
  64        CDMA_EVENT_SYNC_QUEUE_EMPTY,    /* wait for empty sync queue */
  65        CDMA_EVENT_PUSH_BUFFER_SPACE    /* wait for space in push buffer */
  66};
  67
  68struct host1x_cdma {
  69        struct mutex lock;              /* controls access to shared state */
  70        struct semaphore sem;           /* signalled when event occurs */
  71        enum cdma_event event;          /* event that sem is waiting for */
  72        unsigned int slots_used;        /* pb slots used in current submit */
  73        unsigned int slots_free;        /* pb slots free in current submit */
  74        unsigned int first_get;         /* DMAGET value, where submit begins */
  75        unsigned int last_pos;          /* last value written to DMAPUT */
  76        struct push_buffer push_buffer; /* channel's push buffer */
  77        struct list_head sync_queue;    /* job queue */
  78        struct buffer_timeout timeout;  /* channel's timeout state/wq */
  79        bool running;
  80        bool torndown;
  81};
  82
  83#define cdma_to_channel(cdma) container_of(cdma, struct host1x_channel, cdma)
  84#define cdma_to_host1x(cdma) dev_get_drvdata(cdma_to_channel(cdma)->dev->parent)
  85#define pb_to_cdma(pb) container_of(pb, struct host1x_cdma, push_buffer)
  86
  87int host1x_cdma_init(struct host1x_cdma *cdma);
  88int host1x_cdma_deinit(struct host1x_cdma *cdma);
  89void host1x_cdma_stop(struct host1x_cdma *cdma);
  90int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job);
  91void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2);
  92void host1x_cdma_end(struct host1x_cdma *cdma, struct host1x_job *job);
  93void host1x_cdma_update(struct host1x_cdma *cdma);
  94void host1x_cdma_peek(struct host1x_cdma *cdma, u32 dmaget, int slot,
  95                      u32 *out);
  96unsigned int host1x_cdma_wait_locked(struct host1x_cdma *cdma,
  97                                     enum cdma_event event);
  98void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,
  99                                   struct device *dev);
 100#endif
 101