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