drivers/gpu/drm/i915/i915_gem_render_state.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Mika Kuoppala <mika.kuoppala@intel.com>
  25  *
  26  */
  27
  28 #include "i915_drv.h"
  29 #include "intel_renderstate.h"
  30
  31 static const struct intel_renderstate_rodata *
  32 render_state_get_rodata(const int gen)
  33 {
  34         switch (gen) {
  35         case 6:
  36                 return &gen6_null_state;
  37         case 7:
  38                 return &gen7_null_state;
  39         case 8:
  40                 return &gen8_null_state;
  41         case 9:
  42                 return &gen9_null_state;
  43         }
  44
  45         return NULL;
  46 }
  47
  48 static int render_state_init(struct render_state *so,
  49                              struct drm_i915_private *dev_priv)
  50 {
  51         int ret;
  52
  53         so->gen = INTEL_GEN(dev_priv);
  54         so->rodata = render_state_get_rodata(so->gen);
  55         if (so->rodata == NULL)
  56                 return 0;
  57
  58         if (so->rodata->batch_items * 4 > 4096)
  59                 return -EINVAL;
  60
  61         so->obj = i915_gem_object_create(dev_priv->dev, 4096);
  62         if (IS_ERR(so->obj))
  63                 return PTR_ERR(so->obj);
  64
  65         ret = i915_gem_obj_ggtt_pin(so->obj, 4096, 0);
  66         if (ret)
  67                 goto free_gem;
  68
  69         so->ggtt_offset = i915_gem_obj_ggtt_offset(so->obj);
  70         return 0;
  71
  72 free_gem:
  73         drm_gem_object_unreference(&so->obj->base);
  74         return ret;
  75 }
  76
  77 /*
  78  * Macro to add commands to auxiliary batch.
  79  * This macro only checks for page overflow before inserting the commands,
  80  * this is sufficient as the null state generator makes the final batch
  81  * with two passes to build command and state separately. At this point
  82  * the size of both are known and it compacts them by relocating the state
  83  * right after the commands taking care of aligment so we should sufficient
  84  * space below them for adding new commands.
  85  */
  86 #define OUT_BATCH(batch, i, val)                                \
  87         do {                                                    \
  88                 if (WARN_ON((i) >= PAGE_SIZE / sizeof(u32))) {  \
  89                         ret = -ENOSPC;                          \
  90                         goto err_out;                           \
  91                 }                                               \
  92                 (batch)[(i)++] = (val);                         \
  93         } while(0)
  94
  95 static int render_state_setup(struct render_state *so)
  96 {
  97         const struct intel_renderstate_rodata *rodata = so->rodata;
  98         unsigned int i = 0, reloc_index = 0;
  99         struct page *page;
 100         u32 *d;
 101         int ret;
 102
 103         ret = i915_gem_object_set_to_cpu_domain(so->obj, true);
 104         if (ret)
 105                 return ret;
 106
 107         page = i915_gem_object_get_dirty_page(so->obj, 0);
 108         d = kmap(page);
 109
 110         while (i < rodata->batch_items) {
 111                 u32 s = rodata->batch[i];
 112
 113                 if (i * 4  == rodata->reloc[reloc_index]) {
 114                         u64 r = s + so->ggtt_offset;
 115                         s = lower_32_bits(r);
 116                         if (so->gen >= 8) {
 117                                 if (i + 1 >= rodata->batch_items ||
 118                                     rodata->batch[i + 1] != 0) {
 119                                         ret = -EINVAL;
 120                                         goto err_out;
 121                                 }
 122
 123                                 d[i++] = s;
 124                                 s = upper_32_bits(r);
 125                         }
 126
 127                         reloc_index++;
 128                 }
 129
 130                 d[i++] = s;
 131         }
 132
 133         while (i % CACHELINE_DWORDS)
 134                 OUT_BATCH(d, i, MI_NOOP);
 135
 136         so->aux_batch_offset = i * sizeof(u32);
 137
 138         OUT_BATCH(d, i, MI_BATCH_BUFFER_END);
 139         so->aux_batch_size = (i * sizeof(u32)) - so->aux_batch_offset;
 140
 141         /*
 142          * Since we are sending length, we need to strictly conform to
 143          * all requirements. For Gen2 this must be a multiple of 8.
 144          */
 145         so->aux_batch_size = ALIGN(so->aux_batch_size, 8);
 146
 147         kunmap(page);
 148
 149         ret = i915_gem_object_set_to_gtt_domain(so->obj, false);
 150         if (ret)
 151                 return ret;
 152
 153         if (rodata->reloc[reloc_index] != -1) {
 154                 DRM_ERROR("only %d relocs resolved\n", reloc_index);
 155                 return -EINVAL;
 156         }
 157
 158         return 0;
 159
 160 err_out:
 161         kunmap(page);
 162         return ret;
 163 }
 164
 165 #undef OUT_BATCH
 166
 167 void i915_gem_render_state_fini(struct render_state *so)
 168 {
 169         i915_gem_object_ggtt_unpin(so->obj);
 170         drm_gem_object_unreference(&so->obj->base);
 171 }
 172
 173 int i915_gem_render_state_prepare(struct intel_engine_cs *engine,
 174                                   struct render_state *so)
 175 {
 176         int ret;
 177
 178         if (WARN_ON(engine->id != RCS))
 179                 return -ENOENT;
 180
 181         ret = render_state_init(so, engine->i915);
 182         if (ret)
 183                 return ret;
 184
 185         if (so->rodata == NULL)
 186                 return 0;
 187
 188         ret = render_state_setup(so);
 189         if (ret) {
 190                 i915_gem_render_state_fini(so);
 191                 return ret;
 192         }
 193
 194         return 0;
 195 }
 196
 197 int i915_gem_render_state_init(struct drm_i915_gem_request *req)
 198 {
 199         struct render_state so;
 200         int ret;
 201
 202         ret = i915_gem_render_state_prepare(req->engine, &so);
 203         if (ret)
 204                 return ret;
 205
 206         if (so.rodata == NULL)
 207                 return 0;
 208
 209         ret = req->engine->dispatch_execbuffer(req, so.ggtt_offset,
 210                                              so.rodata->batch_items * 4,
 211                                              I915_DISPATCH_SECURE);
 212         if (ret)
 213                 goto out;
 214
 215         if (so.aux_batch_size > 8) {
 216                 ret = req->engine->dispatch_execbuffer(req,
 217                                                      (so.ggtt_offset +
 218                                                       so.aux_batch_offset),
 219                                                      so.aux_batch_size,
 220                                                      I915_DISPATCH_SECURE);
 221                 if (ret)
 222                         goto out;
 223         }
 224
 225         i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), req);
 226
 227 out:
 228         i915_gem_render_state_fini(&so);
 229         return ret;
 230 }