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
  50                         offset += i * sizeof(u32);
  51
  52                         trace_host1x_cdma_push_gather(dev_name(dev), bo,
  53                                                       num_words, offset,
  54                                                       mem);
  55                 }
  56
  57                 host1x_bo_munmap(bo, mem);
  58         }
  59 }
  60
  61 static void submit_gathers(struct host1x_job *job)
  62 {
  63         struct host1x_cdma *cdma = &job->channel->cdma;
  64         unsigned int i;
  65
  66         for (i = 0; i < job->num_gathers; i++) {
  67                 struct host1x_job_gather *g = &job->gathers[i];
  68                 u32 op1 = host1x_opcode_gather(g->words);
  69                 u32 op2 = g->base + g->offset;
  70
  71                 trace_write_gather(cdma, g->bo, g->offset, op1 & 0xffff);
  72                 host1x_cdma_push(cdma, op1, op2);
  73         }
  74 }
  75
  76 static inline void synchronize_syncpt_base(struct host1x_job *job)
  77 {
  78         struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
  79         struct host1x_syncpt *sp = host->syncpt + job->syncpt_id;
  80         unsigned int id;
  81         u32 value;
  82
  83         value = host1x_syncpt_read_max(sp);
  84         id = sp->base->id;
  85
  86         host1x_cdma_push(&job->channel->cdma,
  87                          host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
  88                                 HOST1X_UCLASS_LOAD_SYNCPT_BASE, 1),
  89                          HOST1X_UCLASS_LOAD_SYNCPT_BASE_BASE_INDX_F(id) |
  90                          HOST1X_UCLASS_LOAD_SYNCPT_BASE_VALUE_F(value));
  91 }
  92
  93 static int channel_submit(struct host1x_job *job)
  94 {
  95         struct host1x_channel *ch = job->channel;
  96         struct host1x_syncpt *sp;
  97         u32 user_syncpt_incrs = job->syncpt_incrs;
  98         u32 prev_max = 0;
  99         u32 syncval;
 100         int err;
 101         struct host1x_waitlist *completed_waiter = NULL;
 102         struct host1x *host = dev_get_drvdata(ch->dev->parent);
 103
 104         sp = host->syncpt + job->syncpt_id;
 105         trace_host1x_channel_submit(dev_name(ch->dev),
 106                                     job->num_gathers, job->num_relocs,
 107                                     job->num_waitchk, job->syncpt_id,
 108                                     job->syncpt_incrs);
 109
 110         /* before error checks, return current max */
 111         prev_max = job->syncpt_end = host1x_syncpt_read_max(sp);
 112
 113         /* get submit lock */
 114         err = mutex_lock_interruptible(&ch->submitlock);
 115         if (err)
 116                 goto error;
 117
 118         completed_waiter = kzalloc(sizeof(*completed_waiter), GFP_KERNEL);
 119         if (!completed_waiter) {
 120                 mutex_unlock(&ch->submitlock);
 121                 err = -ENOMEM;
 122                 goto error;
 123         }
 124
 125         /* begin a CDMA submit */
 126         err = host1x_cdma_begin(&ch->cdma, job);
 127         if (err) {
 128                 mutex_unlock(&ch->submitlock);
 129                 goto error;
 130         }
 131
 132         if (job->serialize) {
 133                 /*
 134                  * Force serialization by inserting a host wait for the
 135                  * previous job to finish before this one can commence.
 136                  */
 137                 host1x_cdma_push(&ch->cdma,
 138                                  host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
 139                                         host1x_uclass_wait_syncpt_r(), 1),
 140                                  host1x_class_host_wait_syncpt(job->syncpt_id,
 141                                         host1x_syncpt_read_max(sp)));
 142         }
 143
 144         /* Synchronize base register to allow using it for relative waiting */
 145         if (sp->base)
 146                 synchronize_syncpt_base(job);
 147
 148         syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
 149
 150         job->syncpt_end = syncval;
 151
 152         /* add a setclass for modules that require it */
 153         if (job->class)
 154                 host1x_cdma_push(&ch->cdma,
 155                                  host1x_opcode_setclass(job->class, 0, 0),
 156                                  HOST1X_OPCODE_NOP);
 157
 158         submit_gathers(job);
 159
 160         /* end CDMA submit & stash pinned hMems into sync queue */
 161         host1x_cdma_end(&ch->cdma, job);
 162
 163         trace_host1x_channel_submitted(dev_name(ch->dev), prev_max, syncval);
 164
 165         /* schedule a submit complete interrupt */
 166         err = host1x_intr_add_action(host, job->syncpt_id, syncval,
 167                                      HOST1X_INTR_ACTION_SUBMIT_COMPLETE, ch,
 168                                      completed_waiter, NULL);
 169         completed_waiter = NULL;
 170         WARN(err, "Failed to set submit complete interrupt");
 171
 172         mutex_unlock(&ch->submitlock);
 173
 174         return 0;
 175
 176 error:
 177         kfree(completed_waiter);
 178         return err;
 179 }
 180
 181 static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev,
 182                                unsigned int index)
 183 {
 184         ch->id = index;
 185         mutex_init(&ch->reflock);
 186         mutex_init(&ch->submitlock);
 187
 188         ch->regs = dev->regs + index * HOST1X_CHANNEL_SIZE;
 189         return 0;
 190 }
 191
 192 static const struct host1x_channel_ops host1x_channel_ops = {
 193         .init = host1x_channel_init,
 194         .submit = channel_submit,
 195 };