drivers/gpu/host1x/hw/channel_hw.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Tegra host1x Channel
   4  *
   5  * Copyright (c) 2010-2013, NVIDIA Corporation.
   6  */
   7
   8 #include <linux/host1x.h>
   9 #include <linux/iommu.h>
  10 #include <linux/slab.h>
  11
  12 #include <trace/events/host1x.h>
  13
  14 #include "../channel.h"
  15 #include "../dev.h"
  16 #include "../intr.h"
  17 #include "../job.h"
  18
  19 #define TRACE_MAX_LENGTH 128U
  20
  21 static void trace_write_gather(struct host1x_cdma *cdma, struct host1x_bo *bo,
  22                                u32 offset, u32 words)
  23 {
  24         struct device *dev = cdma_to_channel(cdma)->dev;
  25         void *mem = NULL;
  26
  27         if (host1x_debug_trace_cmdbuf)
  28                 mem = host1x_bo_mmap(bo);
  29
  30         if (mem) {
  31                 u32 i;
  32                 /*
  33                  * Write in batches of 128 as there seems to be a limit
  34                  * of how much you can output to ftrace at once.
  35                  */
  36                 for (i = 0; i < words; i += TRACE_MAX_LENGTH) {
  37                         u32 num_words = min(words - i, TRACE_MAX_LENGTH);
  38
  39                         offset += i * sizeof(u32);
  40
  41                         trace_host1x_cdma_push_gather(dev_name(dev), bo,
  42                                                       num_words, offset,
  43                                                       mem);
  44                 }
  45
  46                 host1x_bo_munmap(bo, mem);
  47         }
  48 }
  49
  50 static void submit_wait(struct host1x_job *job, u32 id, u32 threshold,
  51                         u32 next_class)
  52 {
  53         struct host1x_cdma *cdma = &job->channel->cdma;
  54
  55 #if HOST1X_HW >= 6
  56         u32 stream_id;
  57
  58         /*
  59          * If a memory context has been set, use it. Otherwise
  60          * (if context isolation is disabled) use the engine's
  61          * firmware stream ID.
  62          */
  63         if (job->memory_context)
  64                 stream_id = job->memory_context->stream_id;
  65         else
  66                 stream_id = job->engine_fallback_streamid;
  67
  68         host1x_cdma_push_wide(cdma,
  69                 host1x_opcode_setclass(
  70                         HOST1X_CLASS_HOST1X,
  71                         HOST1X_UCLASS_LOAD_SYNCPT_PAYLOAD_32,
  72                         /* WAIT_SYNCPT_32 is at SYNCPT_PAYLOAD_32+2 */
  73                         BIT(0) | BIT(2)
  74                 ),
  75                 threshold,
  76                 id,
  77                 HOST1X_OPCODE_NOP
  78         );
  79         host1x_cdma_push_wide(&job->channel->cdma,
  80                 host1x_opcode_setclass(job->class, 0, 0),
  81                 host1x_opcode_setpayload(stream_id),
  82                 host1x_opcode_setstreamid(job->engine_streamid_offset / 4),
  83                 HOST1X_OPCODE_NOP);
  84 #elif HOST1X_HW >= 2
  85         host1x_cdma_push_wide(cdma,
  86                 host1x_opcode_setclass(
  87                         HOST1X_CLASS_HOST1X,
  88                         HOST1X_UCLASS_LOAD_SYNCPT_PAYLOAD_32,
  89                         /* WAIT_SYNCPT_32 is at SYNCPT_PAYLOAD_32+2 */
  90                         BIT(0) | BIT(2)
  91                 ),
  92                 threshold,
  93                 id,
  94                 host1x_opcode_setclass(next_class, 0, 0)
  95         );
  96 #else
  97         /* TODO add waitchk or use waitbases or other mitigation */
  98         host1x_cdma_push(cdma,
  99                 host1x_opcode_setclass(
 100                         HOST1X_CLASS_HOST1X,
 101                         host1x_uclass_wait_syncpt_r(),
 102                         BIT(0)
 103                 ),
 104                 host1x_class_host_wait_syncpt(id, threshold)
 105         );
 106         host1x_cdma_push(cdma,
 107                 host1x_opcode_setclass(next_class, 0, 0),
 108                 HOST1X_OPCODE_NOP
 109         );
 110 #endif
 111 }
 112
 113 static void submit_gathers(struct host1x_job *job, u32 job_syncpt_base)
 114 {
 115         struct host1x_cdma *cdma = &job->channel->cdma;
 116 #if HOST1X_HW < 6
 117         struct device *dev = job->channel->dev;
 118 #endif
 119         unsigned int i;
 120         u32 threshold;
 121
 122         for (i = 0; i < job->num_cmds; i++) {
 123                 struct host1x_job_cmd *cmd = &job->cmds[i];
 124
 125                 if (cmd->is_wait) {
 126                         if (cmd->wait.relative)
 127                                 threshold = job_syncpt_base + cmd->wait.threshold;
 128                         else
 129                                 threshold = cmd->wait.threshold;
 130
 131                         submit_wait(job, cmd->wait.id, threshold, cmd->wait.next_class);
 132                 } else {
 133                         struct host1x_job_gather *g = &cmd->gather;
 134
 135                         dma_addr_t addr = g->base + g->offset;
 136                         u32 op2, op3;
 137
 138                         op2 = lower_32_bits(addr);
 139                         op3 = upper_32_bits(addr);
 140
 141                         trace_write_gather(cdma, g->bo, g->offset, g->words);
 142
 143                         if (op3 != 0) {
 144 #if HOST1X_HW >= 6
 145                                 u32 op1 = host1x_opcode_gather_wide(g->words);
 146                                 u32 op4 = HOST1X_OPCODE_NOP;
 147
 148                                 host1x_cdma_push_wide(cdma, op1, op2, op3, op4);
 149 #else
 150                                 dev_err(dev, "invalid gather for push buffer %pad\n",
 151                                         &addr);
 152                                 continue;
 153 #endif
 154                         } else {
 155                                 u32 op1 = host1x_opcode_gather(g->words);
 156
 157                                 host1x_cdma_push(cdma, op1, op2);
 158                         }
 159                 }
 160         }
 161 }
 162
 163 static inline void synchronize_syncpt_base(struct host1x_job *job)
 164 {
 165         struct host1x_syncpt *sp = job->syncpt;
 166         unsigned int id;
 167         u32 value;
 168
 169         value = host1x_syncpt_read_max(sp);
 170         id = sp->base->id;
 171
 172         host1x_cdma_push(&job->channel->cdma,
 173                          host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
 174                                 HOST1X_UCLASS_LOAD_SYNCPT_BASE, 1),
 175                          HOST1X_UCLASS_LOAD_SYNCPT_BASE_BASE_INDX_F(id) |
 176                          HOST1X_UCLASS_LOAD_SYNCPT_BASE_VALUE_F(value));
 177 }
 178
 179 static void host1x_channel_set_streamid(struct host1x_channel *channel)
 180 {
 181 #if HOST1X_HW >= 6
 182         u32 stream_id;
 183
 184         if (!tegra_dev_iommu_get_stream_id(channel->dev->parent, &stream_id))
 185                 stream_id = TEGRA_STREAM_ID_BYPASS;
 186
 187         host1x_ch_writel(channel, stream_id, HOST1X_CHANNEL_SMMU_STREAMID);
 188 #endif
 189 }
 190
 191 static void host1x_enable_gather_filter(struct host1x_channel *ch)
 192 {
 193 #if HOST1X_HW >= 6
 194         struct host1x *host = dev_get_drvdata(ch->dev->parent);
 195         u32 val;
 196
 197         if (!host->hv_regs)
 198                 return;
 199
 200         val = host1x_hypervisor_readl(
 201                 host, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32));
 202         val |= BIT(ch->id % 32);
 203         host1x_hypervisor_writel(
 204                 host, val, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32));
 205 #elif HOST1X_HW >= 4
 206         host1x_ch_writel(ch,
 207                          HOST1X_CHANNEL_CHANNELCTRL_KERNEL_FILTER_GBUFFER(1),
 208                          HOST1X_CHANNEL_CHANNELCTRL);
 209 #endif
 210 }
 211
 212 static void channel_program_cdma(struct host1x_job *job)
 213 {
 214         struct host1x_cdma *cdma = &job->channel->cdma;
 215         struct host1x_syncpt *sp = job->syncpt;
 216
 217 #if HOST1X_HW >= 6
 218         u32 fence;
 219
 220         /* Enter engine class with invalid stream ID. */
 221         host1x_cdma_push_wide(cdma,
 222                 host1x_opcode_acquire_mlock(job->class),
 223                 host1x_opcode_setclass(job->class, 0, 0),
 224                 host1x_opcode_setpayload(0),
 225                 host1x_opcode_setstreamid(job->engine_streamid_offset / 4));
 226
 227         /* Before switching stream ID to real stream ID, ensure engine is idle. */
 228         fence = host1x_syncpt_incr_max(sp, 1);
 229         host1x_cdma_push(&job->channel->cdma,
 230                 host1x_opcode_nonincr(HOST1X_UCLASS_INCR_SYNCPT, 1),
 231                 HOST1X_UCLASS_INCR_SYNCPT_INDX_F(job->syncpt->id) |
 232                         HOST1X_UCLASS_INCR_SYNCPT_COND_F(4));
 233         submit_wait(job, job->syncpt->id, fence, job->class);
 234
 235         /* Submit work. */
 236         job->syncpt_end = host1x_syncpt_incr_max(sp, job->syncpt_incrs);
 237         submit_gathers(job, job->syncpt_end - job->syncpt_incrs);
 238
 239         /* Before releasing MLOCK, ensure engine is idle again. */
 240         fence = host1x_syncpt_incr_max(sp, 1);
 241         host1x_cdma_push(&job->channel->cdma,
 242                 host1x_opcode_nonincr(HOST1X_UCLASS_INCR_SYNCPT, 1),
 243                 HOST1X_UCLASS_INCR_SYNCPT_INDX_F(job->syncpt->id) |
 244                         HOST1X_UCLASS_INCR_SYNCPT_COND_F(4));
 245         submit_wait(job, job->syncpt->id, fence, job->class);
 246
 247         /* Release MLOCK. */
 248         host1x_cdma_push(cdma,
 249                 HOST1X_OPCODE_NOP, host1x_opcode_release_mlock(job->class));
 250 #else
 251         if (job->serialize) {
 252                 /*
 253                  * Force serialization by inserting a host wait for the
 254                  * previous job to finish before this one can commence.
 255                  */
 256                 host1x_cdma_push(cdma,
 257                                  host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
 258                                         host1x_uclass_wait_syncpt_r(), 1),
 259                                  host1x_class_host_wait_syncpt(job->syncpt->id,
 260                                         host1x_syncpt_read_max(sp)));
 261         }
 262
 263         /* Synchronize base register to allow using it for relative waiting */
 264         if (sp->base)
 265                 synchronize_syncpt_base(job);
 266
 267         /* add a setclass for modules that require it */
 268         if (job->class)
 269                 host1x_cdma_push(cdma,
 270                                  host1x_opcode_setclass(job->class, 0, 0),
 271                                  HOST1X_OPCODE_NOP);
 272
 273         job->syncpt_end = host1x_syncpt_incr_max(sp, job->syncpt_incrs);
 274
 275         submit_gathers(job, job->syncpt_end - job->syncpt_incrs);
 276 #endif
 277 }
 278
 279 static void job_complete_callback(struct dma_fence *fence, struct dma_fence_cb *cb)
 280 {
 281         struct host1x_job *job = container_of(cb, struct host1x_job, fence_cb);
 282
 283         /* Schedules CDMA update. */
 284         host1x_cdma_update(&job->channel->cdma);
 285 }
 286
 287 static int channel_submit(struct host1x_job *job)
 288 {
 289         struct host1x_channel *ch = job->channel;
 290         struct host1x_syncpt *sp = job->syncpt;
 291         u32 prev_max = 0;
 292         u32 syncval;
 293         int err;
 294         struct host1x *host = dev_get_drvdata(ch->dev->parent);
 295
 296         trace_host1x_channel_submit(dev_name(ch->dev),
 297                                     job->num_cmds, job->num_relocs,
 298                                     job->syncpt->id, job->syncpt_incrs);
 299
 300         /* before error checks, return current max */
 301         prev_max = job->syncpt_end = host1x_syncpt_read_max(sp);
 302
 303         /* get submit lock */
 304         err = mutex_lock_interruptible(&ch->submitlock);
 305         if (err)
 306                 return err;
 307
 308         host1x_channel_set_streamid(ch);
 309         host1x_enable_gather_filter(ch);
 310         host1x_hw_syncpt_assign_to_channel(host, sp, ch);
 311
 312         /* begin a CDMA submit */
 313         err = host1x_cdma_begin(&ch->cdma, job);
 314         if (err) {
 315                 mutex_unlock(&ch->submitlock);
 316                 return err;
 317         }
 318
 319         channel_program_cdma(job);
 320         syncval = host1x_syncpt_read_max(sp);
 321
 322         /*
 323          * Create fence before submitting job to HW to avoid job completing
 324          * before the fence is set up.
 325          */
 326         job->fence = host1x_fence_create(sp, syncval, true);
 327         if (WARN(IS_ERR(job->fence), "Failed to create submit complete fence")) {
 328                 job->fence = NULL;
 329         } else {
 330                 err = dma_fence_add_callback(job->fence, &job->fence_cb,
 331                                              job_complete_callback);
 332         }
 333
 334         /* end CDMA submit & stash pinned hMems into sync queue */
 335         host1x_cdma_end(&ch->cdma, job);
 336
 337         trace_host1x_channel_submitted(dev_name(ch->dev), prev_max, syncval);
 338
 339         mutex_unlock(&ch->submitlock);
 340
 341         if (err == -ENOENT)
 342                 host1x_cdma_update(&ch->cdma);
 343         else
 344                 WARN(err, "Failed to set submit complete interrupt");
 345
 346         return 0;
 347 }
 348
 349 static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev,
 350                                unsigned int index)
 351 {
 352 #if HOST1X_HW < 6
 353         ch->regs = dev->regs + index * 0x4000;
 354 #else
 355         ch->regs = dev->regs + index * 0x100;
 356 #endif
 357         return 0;
 358 }
 359
 360 static const struct host1x_channel_ops host1x_channel_ops = {
 361         .init = host1x_channel_init,
 362         .submit = channel_submit,
 363 };