kernel/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         struct device *dev = cdma_to_channel(cdma)->dev;
  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                         u32 num_words = min(words - i, TRACE_MAX_LENGTH);
  49                         offset += i * sizeof(u32);
  50
  51                         trace_host1x_cdma_push_gather(dev_name(dev), bo,
  52                                                       num_words, offset,
  53                                                       mem);
  54                 }
  55
  56                 host1x_bo_munmap(bo, mem);
  57         }
  58 }
  59
  60 static void submit_gathers(struct host1x_job *job)
  61 {
  62         struct host1x_cdma *cdma = &job->channel->cdma;
  63         unsigned int i;
  64
  65         for (i = 0; i < job->num_gathers; i++) {
  66                 struct host1x_job_gather *g = &job->gathers[i];
  67                 u32 op1 = host1x_opcode_gather(g->words);
  68                 u32 op2 = g->base + g->offset;
  69                 trace_write_gather(cdma, g->bo, g->offset, op1 & 0xffff);
  70                 host1x_cdma_push(cdma, op1, op2);
  71         }
  72 }
  73
  74 static inline void synchronize_syncpt_base(struct host1x_job *job)
  75 {
  76         struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
  77         struct host1x_syncpt *sp = host->syncpt + job->syncpt_id;
  78         u32 id, value;
  79
  80         value = host1x_syncpt_read_max(sp);
  81         id = sp->base->id;
  82
  83         host1x_cdma_push(&job->channel->cdma,
  84                          host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
  85                                 HOST1X_UCLASS_LOAD_SYNCPT_BASE, 1),
  86                          HOST1X_UCLASS_LOAD_SYNCPT_BASE_BASE_INDX_F(id) |
  87                          HOST1X_UCLASS_LOAD_SYNCPT_BASE_VALUE_F(value));
  88 }
  89
  90 static int channel_submit(struct host1x_job *job)
  91 {
  92         struct host1x_channel *ch = job->channel;
  93         struct host1x_syncpt *sp;
  94         u32 user_syncpt_incrs = job->syncpt_incrs;
  95         u32 prev_max = 0;
  96         u32 syncval;
  97         int err;
  98         struct host1x_waitlist *completed_waiter = NULL;
  99         struct host1x *host = dev_get_drvdata(ch->dev->parent);
 100
 101         sp = host->syncpt + job->syncpt_id;
 102         trace_host1x_channel_submit(dev_name(ch->dev),
 103                                     job->num_gathers, job->num_relocs,
 104                                     job->num_waitchk, job->syncpt_id,
 105                                     job->syncpt_incrs);
 106
 107         /* before error checks, return current max */
 108         prev_max = job->syncpt_end = host1x_syncpt_read_max(sp);
 109
 110         /* get submit lock */
 111         err = mutex_lock_interruptible(&ch->submitlock);
 112         if (err)
 113                 goto error;
 114
 115         completed_waiter = kzalloc(sizeof(*completed_waiter), GFP_KERNEL);
 116         if (!completed_waiter) {
 117                 mutex_unlock(&ch->submitlock);
 118                 err = -ENOMEM;
 119                 goto error;
 120         }
 121
 122         /* begin a CDMA submit */
 123         err = host1x_cdma_begin(&ch->cdma, job);
 124         if (err) {
 125                 mutex_unlock(&ch->submitlock);
 126                 goto error;
 127         }
 128
 129         if (job->serialize) {
 130                 /*
 131                  * Force serialization by inserting a host wait for the
 132                  * previous job to finish before this one can commence.
 133                  */
 134                 host1x_cdma_push(&ch->cdma,
 135                                  host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
 136                                         host1x_uclass_wait_syncpt_r(), 1),
 137                                  host1x_class_host_wait_syncpt(job->syncpt_id,
 138                                         host1x_syncpt_read_max(sp)));
 139         }
 140
 141         /* Synchronize base register to allow using it for relative waiting */
 142         if (sp->base)
 143                 synchronize_syncpt_base(job);
 144
 145         syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
 146
 147         job->syncpt_end = syncval;
 148
 149         /* add a setclass for modules that require it */
 150         if (job->class)
 151                 host1x_cdma_push(&ch->cdma,
 152                                  host1x_opcode_setclass(job->class, 0, 0),
 153                                  HOST1X_OPCODE_NOP);
 154
 155         submit_gathers(job);
 156
 157         /* end CDMA submit & stash pinned hMems into sync queue */
 158         host1x_cdma_end(&ch->cdma, job);
 159
 160         trace_host1x_channel_submitted(dev_name(ch->dev), prev_max, syncval);
 161
 162         /* schedule a submit complete interrupt */
 163         err = host1x_intr_add_action(host, job->syncpt_id, syncval,
 164                                      HOST1X_INTR_ACTION_SUBMIT_COMPLETE, ch,
 165                                      completed_waiter, NULL);
 166         completed_waiter = NULL;
 167         WARN(err, "Failed to set submit complete interrupt");
 168
 169         mutex_unlock(&ch->submitlock);
 170
 171         return 0;
 172
 173 error:
 174         kfree(completed_waiter);
 175         return err;
 176 }
 177
 178 static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev,
 179                                unsigned int index)
 180 {
 181         ch->id = index;
 182         mutex_init(&ch->reflock);
 183         mutex_init(&ch->submitlock);
 184
 185         ch->regs = dev->regs + index * HOST1X_CHANNEL_SIZE;
 186         return 0;
 187 }
 188
 189 static const struct host1x_channel_ops host1x_channel_ops = {
 190         .init = host1x_channel_init,
 191         .submit = channel_submit,
 192 };