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_gathers(struct host1x_job *job)
  51 {
  52         struct host1x_cdma *cdma = &job->channel->cdma;
  53 #if HOST1X_HW < 6
  54         struct device *dev = job->channel->dev;
  55 #endif
  56         unsigned int i;
  57
  58         for (i = 0; i < job->num_gathers; i++) {
  59                 struct host1x_job_gather *g = &job->gathers[i];
  60                 dma_addr_t addr = g->base + g->offset;
  61                 u32 op2, op3;
  62
  63                 op2 = lower_32_bits(addr);
  64                 op3 = upper_32_bits(addr);
  65
  66                 trace_write_gather(cdma, g->bo, g->offset, g->words);
  67
  68                 if (op3 != 0) {
  69 #if HOST1X_HW >= 6
  70                         u32 op1 = host1x_opcode_gather_wide(g->words);
  71                         u32 op4 = HOST1X_OPCODE_NOP;
  72
  73                         host1x_cdma_push_wide(cdma, op1, op2, op3, op4);
  74 #else
  75                         dev_err(dev, "invalid gather for push buffer %pad\n",
  76                                 &addr);
  77                         continue;
  78 #endif
  79                 } else {
  80                         u32 op1 = host1x_opcode_gather(g->words);
  81
  82                         host1x_cdma_push(cdma, op1, op2);
  83                 }
  84         }
  85 }
  86
  87 static inline void synchronize_syncpt_base(struct host1x_job *job)
  88 {
  89         struct host1x_syncpt *sp = job->syncpt;
  90         unsigned int id;
  91         u32 value;
  92
  93         value = host1x_syncpt_read_max(sp);
  94         id = sp->base->id;
  95
  96         host1x_cdma_push(&job->channel->cdma,
  97                          host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
  98                                 HOST1X_UCLASS_LOAD_SYNCPT_BASE, 1),
  99                          HOST1X_UCLASS_LOAD_SYNCPT_BASE_BASE_INDX_F(id) |
 100                          HOST1X_UCLASS_LOAD_SYNCPT_BASE_VALUE_F(value));
 101 }
 102
 103 static void host1x_channel_set_streamid(struct host1x_channel *channel)
 104 {
 105 #if HOST1X_HW >= 6
 106         u32 sid = 0x7f;
 107 #ifdef CONFIG_IOMMU_API
 108         struct iommu_fwspec *spec = dev_iommu_fwspec_get(channel->dev->parent);
 109         if (spec)
 110                 sid = spec->ids[0] & 0xffff;
 111 #endif
 112
 113         host1x_ch_writel(channel, sid, HOST1X_CHANNEL_SMMU_STREAMID);
 114 #endif
 115 }
 116
 117 static int channel_submit(struct host1x_job *job)
 118 {
 119         struct host1x_channel *ch = job->channel;
 120         struct host1x_syncpt *sp = job->syncpt;
 121         u32 user_syncpt_incrs = job->syncpt_incrs;
 122         u32 prev_max = 0;
 123         u32 syncval;
 124         int err;
 125         struct host1x_waitlist *completed_waiter = NULL;
 126         struct host1x *host = dev_get_drvdata(ch->dev->parent);
 127
 128         trace_host1x_channel_submit(dev_name(ch->dev),
 129                                     job->num_gathers, job->num_relocs,
 130                                     job->syncpt->id, job->syncpt_incrs);
 131
 132         /* before error checks, return current max */
 133         prev_max = job->syncpt_end = host1x_syncpt_read_max(sp);
 134
 135         /* get submit lock */
 136         err = mutex_lock_interruptible(&ch->submitlock);
 137         if (err)
 138                 goto error;
 139
 140         completed_waiter = kzalloc(sizeof(*completed_waiter), GFP_KERNEL);
 141         if (!completed_waiter) {
 142                 mutex_unlock(&ch->submitlock);
 143                 err = -ENOMEM;
 144                 goto error;
 145         }
 146
 147         host1x_channel_set_streamid(ch);
 148
 149         /* begin a CDMA submit */
 150         err = host1x_cdma_begin(&ch->cdma, job);
 151         if (err) {
 152                 mutex_unlock(&ch->submitlock);
 153                 goto error;
 154         }
 155
 156         if (job->serialize) {
 157                 /*
 158                  * Force serialization by inserting a host wait for the
 159                  * previous job to finish before this one can commence.
 160                  */
 161                 host1x_cdma_push(&ch->cdma,
 162                                  host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
 163                                         host1x_uclass_wait_syncpt_r(), 1),
 164                                  host1x_class_host_wait_syncpt(job->syncpt->id,
 165                                         host1x_syncpt_read_max(sp)));
 166         }
 167
 168         /* Synchronize base register to allow using it for relative waiting */
 169         if (sp->base)
 170                 synchronize_syncpt_base(job);
 171
 172         syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
 173
 174         host1x_hw_syncpt_assign_to_channel(host, sp, ch);
 175
 176         job->syncpt_end = syncval;
 177
 178         /* add a setclass for modules that require it */
 179         if (job->class)
 180                 host1x_cdma_push(&ch->cdma,
 181                                  host1x_opcode_setclass(job->class, 0, 0),
 182                                  HOST1X_OPCODE_NOP);
 183
 184         submit_gathers(job);
 185
 186         /* end CDMA submit & stash pinned hMems into sync queue */
 187         host1x_cdma_end(&ch->cdma, job);
 188
 189         trace_host1x_channel_submitted(dev_name(ch->dev), prev_max, syncval);
 190
 191         /* schedule a submit complete interrupt */
 192         err = host1x_intr_add_action(host, sp, syncval,
 193                                      HOST1X_INTR_ACTION_SUBMIT_COMPLETE, ch,
 194                                      completed_waiter, NULL);
 195         completed_waiter = NULL;
 196         WARN(err, "Failed to set submit complete interrupt");
 197
 198         mutex_unlock(&ch->submitlock);
 199
 200         return 0;
 201
 202 error:
 203         kfree(completed_waiter);
 204         return err;
 205 }
 206
 207 static void enable_gather_filter(struct host1x *host,
 208                                  struct host1x_channel *ch)
 209 {
 210 #if HOST1X_HW >= 6
 211         u32 val;
 212
 213         if (!host->hv_regs)
 214                 return;
 215
 216         val = host1x_hypervisor_readl(
 217                 host, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32));
 218         val |= BIT(ch->id % 32);
 219         host1x_hypervisor_writel(
 220                 host, val, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32));
 221 #elif HOST1X_HW >= 4
 222         host1x_ch_writel(ch,
 223                          HOST1X_CHANNEL_CHANNELCTRL_KERNEL_FILTER_GBUFFER(1),
 224                          HOST1X_CHANNEL_CHANNELCTRL);
 225 #endif
 226 }
 227
 228 static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev,
 229                                unsigned int index)
 230 {
 231 #if HOST1X_HW < 6
 232         ch->regs = dev->regs + index * 0x4000;
 233 #else
 234         ch->regs = dev->regs + index * 0x100;
 235 #endif
 236         enable_gather_filter(dev, ch);
 237         return 0;
 238 }
 239
 240 static const struct host1x_channel_ops host1x_channel_ops = {
 241         .init = host1x_channel_init,
 242         .submit = channel_submit,
 243 };