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 TRACE_MAX_LENGTH 128U
  30
  31 static void trace_write_gather(struct host1x_cdma *cdma, struct host1x_bo *bo,
  32                                u32 offset, u32 words)
  33 {
  34         struct device *dev = cdma_to_channel(cdma)->dev;
  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                         u32 num_words = min(words - i, TRACE_MAX_LENGTH);
  48
  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
  70                 trace_write_gather(cdma, g->bo, g->offset, op1 & 0xffff);
  71                 host1x_cdma_push(cdma, op1, op2);
  72         }
  73 }
  74
  75 static inline void synchronize_syncpt_base(struct host1x_job *job)
  76 {
  77         struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
  78         struct host1x_syncpt *sp = host->syncpt + job->syncpt_id;
  79         unsigned int id;
  80         u32 value;
  81
  82         value = host1x_syncpt_read_max(sp);
  83         id = sp->base->id;
  84
  85         host1x_cdma_push(&job->channel->cdma,
  86                          host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
  87                                 HOST1X_UCLASS_LOAD_SYNCPT_BASE, 1),
  88                          HOST1X_UCLASS_LOAD_SYNCPT_BASE_BASE_INDX_F(id) |
  89                          HOST1X_UCLASS_LOAD_SYNCPT_BASE_VALUE_F(value));
  90 }
  91
  92 static int channel_submit(struct host1x_job *job)
  93 {
  94         struct host1x_channel *ch = job->channel;
  95         struct host1x_syncpt *sp;
  96         u32 user_syncpt_incrs = job->syncpt_incrs;
  97         u32 prev_max = 0;
  98         u32 syncval;
  99         int err;
 100         struct host1x_waitlist *completed_waiter = NULL;
 101         struct host1x *host = dev_get_drvdata(ch->dev->parent);
 102
 103         sp = host->syncpt + job->syncpt_id;
 104         trace_host1x_channel_submit(dev_name(ch->dev),
 105                                     job->num_gathers, job->num_relocs,
 106                                     job->syncpt_id, job->syncpt_incrs);
 107
 108         /* before error checks, return current max */
 109         prev_max = job->syncpt_end = host1x_syncpt_read_max(sp);
 110
 111         /* get submit lock */
 112         err = mutex_lock_interruptible(&ch->submitlock);
 113         if (err)
 114                 goto error;
 115
 116         completed_waiter = kzalloc(sizeof(*completed_waiter), GFP_KERNEL);
 117         if (!completed_waiter) {
 118                 mutex_unlock(&ch->submitlock);
 119                 err = -ENOMEM;
 120                 goto error;
 121         }
 122
 123         /* begin a CDMA submit */
 124         err = host1x_cdma_begin(&ch->cdma, job);
 125         if (err) {
 126                 mutex_unlock(&ch->submitlock);
 127                 goto error;
 128         }
 129
 130         if (job->serialize) {
 131                 /*
 132                  * Force serialization by inserting a host wait for the
 133                  * previous job to finish before this one can commence.
 134                  */
 135                 host1x_cdma_push(&ch->cdma,
 136                                  host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
 137                                         host1x_uclass_wait_syncpt_r(), 1),
 138                                  host1x_class_host_wait_syncpt(job->syncpt_id,
 139                                         host1x_syncpt_read_max(sp)));
 140         }
 141
 142         /* Synchronize base register to allow using it for relative waiting */
 143         if (sp->base)
 144                 synchronize_syncpt_base(job);
 145
 146         syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
 147
 148         host1x_hw_syncpt_assign_to_channel(host, sp, ch);
 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, sp, 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 void enable_gather_filter(struct host1x *host,
 182                                  struct host1x_channel *ch)
 183 {
 184 #if HOST1X_HW >= 6
 185         u32 val;
 186
 187         if (!host->hv_regs)
 188                 return;
 189
 190         val = host1x_hypervisor_readl(
 191                 host, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32));
 192         val |= BIT(ch->id % 32);
 193         host1x_hypervisor_writel(
 194                 host, val, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32));
 195 #elif HOST1X_HW >= 4
 196         host1x_ch_writel(ch,
 197                          HOST1X_CHANNEL_CHANNELCTRL_KERNEL_FILTER_GBUFFER(1),
 198                          HOST1X_CHANNEL_CHANNELCTRL);
 199 #endif
 200 }
 201
 202 static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev,
 203                                unsigned int index)
 204 {
 205 #if HOST1X_HW < 6
 206         ch->regs = dev->regs + index * 0x4000;
 207 #else
 208         ch->regs = dev->regs + index * 0x100;
 209 #endif
 210         enable_gather_filter(dev, ch);
 211         return 0;
 212 }
 213
 214 static const struct host1x_channel_ops host1x_channel_ops = {
 215         .init = host1x_channel_init,
 216         .submit = channel_submit,
 217 };