drivers/gpu/host1x/hw/channel_hw.c

   1 /*
   2  * Tegra host1x Channel
   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 #include <linux/host1x.h>
  20 #include <linux/slab.h>
  21
  22 #include <trace/events/host1x.h>
  23
  24 #include "host1x_bo.h"
  25 #include "channel.h"
  26 #include "dev.h"
  27 #include "intr.h"
  28 #include "job.h"
  29
  30 #define HOST1X_CHANNEL_SIZE 16384
  31 #define TRACE_MAX_LENGTH 128U
  32
  33 static void trace_write_gather(struct host1x_cdma *cdma, struct host1x_bo *bo,
  34                                u32 offset, u32 words)
  35 {
  36         void *mem = NULL;
  37
  38         if (host1x_debug_trace_cmdbuf)
  39                 mem = host1x_bo_mmap(bo);
  40
  41         if (mem) {
  42                 u32 i;
  43                 /*
  44                  * Write in batches of 128 as there seems to be a limit
  45                  * of how much you can output to ftrace at once.
  46                  */
  47                 for (i = 0; i < words; i += TRACE_MAX_LENGTH) {
  48                         trace_host1x_cdma_push_gather(
  49                                 dev_name(cdma_to_channel(cdma)->dev),
  50                                 (u32)bo, min(words - i, TRACE_MAX_LENGTH),
  51                                 offset + i * sizeof(u32), mem);
  52                 }
  53                 host1x_bo_munmap(bo, mem);
  54         }
  55 }
  56
  57 static void submit_gathers(struct host1x_job *job)
  58 {
  59         struct host1x_cdma *cdma = &job->channel->cdma;
  60         unsigned int i;
  61
  62         for (i = 0; i < job->num_gathers; i++) {
  63                 struct host1x_job_gather *g = &job->gathers[i];
  64                 u32 op1 = host1x_opcode_gather(g->words);
  65                 u32 op2 = g->base + g->offset;
  66                 trace_write_gather(cdma, g->bo, g->offset, op1 & 0xffff);
  67                 host1x_cdma_push(cdma, op1, op2);
  68         }
  69 }
  70
  71 static int channel_submit(struct host1x_job *job)
  72 {
  73         struct host1x_channel *ch = job->channel;
  74         struct host1x_syncpt *sp;
  75         u32 user_syncpt_incrs = job->syncpt_incrs;
  76         u32 prev_max = 0;
  77         u32 syncval;
  78         int err;
  79         struct host1x_waitlist *completed_waiter = NULL;
  80         struct host1x *host = dev_get_drvdata(ch->dev->parent);
  81
  82         sp = host->syncpt + job->syncpt_id;
  83         trace_host1x_channel_submit(dev_name(ch->dev),
  84                                     job->num_gathers, job->num_relocs,
  85                                     job->num_waitchk, job->syncpt_id,
  86                                     job->syncpt_incrs);
  87
  88         /* before error checks, return current max */
  89         prev_max = job->syncpt_end = host1x_syncpt_read_max(sp);
  90
  91         /* get submit lock */
  92         err = mutex_lock_interruptible(&ch->submitlock);
  93         if (err)
  94                 goto error;
  95
  96         completed_waiter = kzalloc(sizeof(*completed_waiter), GFP_KERNEL);
  97         if (!completed_waiter) {
  98                 mutex_unlock(&ch->submitlock);
  99                 err = -ENOMEM;
 100                 goto error;
 101         }
 102
 103         /* begin a CDMA submit */
 104         err = host1x_cdma_begin(&ch->cdma, job);
 105         if (err) {
 106                 mutex_unlock(&ch->submitlock);
 107                 goto error;
 108         }
 109
 110         if (job->serialize) {
 111                 /*
 112                  * Force serialization by inserting a host wait for the
 113                  * previous job to finish before this one can commence.
 114                  */
 115                 host1x_cdma_push(&ch->cdma,
 116                                  host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
 117                                         host1x_uclass_wait_syncpt_r(), 1),
 118                                  host1x_class_host_wait_syncpt(job->syncpt_id,
 119                                         host1x_syncpt_read_max(sp)));
 120         }
 121
 122         syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
 123
 124         job->syncpt_end = syncval;
 125
 126         /* add a setclass for modules that require it */
 127         if (job->class)
 128                 host1x_cdma_push(&ch->cdma,
 129                                  host1x_opcode_setclass(job->class, 0, 0),
 130                                  HOST1X_OPCODE_NOP);
 131
 132         submit_gathers(job);
 133
 134         /* end CDMA submit & stash pinned hMems into sync queue */
 135         host1x_cdma_end(&ch->cdma, job);
 136
 137         trace_host1x_channel_submitted(dev_name(ch->dev), prev_max, syncval);
 138
 139         /* schedule a submit complete interrupt */
 140         err = host1x_intr_add_action(host, job->syncpt_id, syncval,
 141                                      HOST1X_INTR_ACTION_SUBMIT_COMPLETE, ch,
 142                                      completed_waiter, NULL);
 143         completed_waiter = NULL;
 144         WARN(err, "Failed to set submit complete interrupt");
 145
 146         mutex_unlock(&ch->submitlock);
 147
 148         return 0;
 149
 150 error:
 151         kfree(completed_waiter);
 152         return err;
 153 }
 154
 155 static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev,
 156                                unsigned int index)
 157 {
 158         ch->id = index;
 159         mutex_init(&ch->reflock);
 160         mutex_init(&ch->submitlock);
 161
 162         ch->regs = dev->regs + index * HOST1X_CHANNEL_SIZE;
 163         return 0;
 164 }
 165
 166 static const struct host1x_channel_ops host1x_channel_ops = {
 167         .init = host1x_channel_init,
 168         .submit = channel_submit,
 169 };