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
  26 struct host1x_syncpt;
  27 struct host1x_userctx_timeout;
  28 struct 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
  44 struct push_buffer {
  45         void *mapped;                   /* mapped pushbuffer memory */
  46         dma_addr_t dma;                 /* device address of pushbuffer */
  47         phys_addr_t phys;               /* physical address of pushbuffer */
  48         u32 fence;                      /* index we've written */
  49         u32 pos;                        /* index to write to */
  50         u32 size;
  51         u32 alloc_size;
  52 };
  53
  54 struct buffer_timeout {
  55         struct delayed_work wq;         /* work queue */
  56         bool initialized;               /* timer one-time setup flag */
  57         struct host1x_syncpt *syncpt;   /* buffer completion syncpt */
  58         u32 syncpt_val;                 /* syncpt value when completed */
  59         ktime_t start_ktime;            /* starting time */
  60         /* context timeout information */
  61         int client;
  62 };
  63
  64 enum cdma_event {
  65         CDMA_EVENT_NONE,                /* not waiting for any event */
  66         CDMA_EVENT_SYNC_QUEUE_EMPTY,    /* wait for empty sync queue */
  67         CDMA_EVENT_PUSH_BUFFER_SPACE    /* wait for space in push buffer */
  68 };
  69
  70 struct host1x_cdma {
  71         struct mutex lock;              /* controls access to shared state */
  72         struct semaphore sem;           /* signalled when event occurs */
  73         enum cdma_event event;          /* event that sem is waiting for */
  74         unsigned int slots_used;        /* pb slots used in current submit */
  75         unsigned int slots_free;        /* pb slots free in current submit */
  76         unsigned int first_get;         /* DMAGET value, where submit begins */
  77         unsigned int last_pos;          /* last value written to DMAPUT */
  78         struct push_buffer push_buffer; /* channel's push buffer */
  79         struct list_head sync_queue;    /* job queue */
  80         struct buffer_timeout timeout;  /* channel's timeout state/wq */
  81         bool running;
  82         bool torndown;
  83 };
  84
  85 #define cdma_to_channel(cdma) container_of(cdma, struct host1x_channel, cdma)
  86 #define cdma_to_host1x(cdma) dev_get_drvdata(cdma_to_channel(cdma)->dev->parent)
  87 #define pb_to_cdma(pb) container_of(pb, struct host1x_cdma, push_buffer)
  88
  89 int host1x_cdma_init(struct host1x_cdma *cdma);
  90 int host1x_cdma_deinit(struct host1x_cdma *cdma);
  91 int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job);
  92 void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2);
  93 void host1x_cdma_end(struct host1x_cdma *cdma, struct host1x_job *job);
  94 void host1x_cdma_update(struct host1x_cdma *cdma);
  95 void host1x_cdma_peek(struct host1x_cdma *cdma, u32 dmaget, int slot,
  96                       u32 *out);
  97 unsigned int host1x_cdma_wait_locked(struct host1x_cdma *cdma,
  98                                      enum cdma_event event);
  99 void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,
 100                                    struct device *dev);
 101 #endif