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(struct drm_device *dev, 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         }
  42
  43         return NULL;
  44 }
  45
  46 static int render_state_init(struct render_state *so, struct drm_device *dev)
  47 {
  48         int ret;
  49
  50         so->gen = INTEL_INFO(dev)->gen;
  51         so->rodata = render_state_get_rodata(dev, so->gen);
  52         if (so->rodata == NULL)
  53                 return 0;
  54
  55         if (so->rodata->batch_items * 4 > 4096)
  56                 return -EINVAL;
  57
  58         so->obj = i915_gem_alloc_object(dev, 4096);
  59         if (so->obj == NULL)
  60                 return -ENOMEM;
  61
  62         ret = i915_gem_obj_ggtt_pin(so->obj, 4096, 0);
  63         if (ret)
  64                 goto free_gem;
  65
  66         so->ggtt_offset = i915_gem_obj_ggtt_offset(so->obj);
  67         return 0;
  68
  69 free_gem:
  70         drm_gem_object_unreference(&so->obj->base);
  71         return ret;
  72 }
  73
  74 static int render_state_setup(struct render_state *so)
  75 {
  76         const struct intel_renderstate_rodata *rodata = so->rodata;
  77         unsigned int i = 0, reloc_index = 0;
  78         struct page *page;
  79         u32 *d;
  80         int ret;
  81
  82         ret = i915_gem_object_set_to_cpu_domain(so->obj, true);
  83         if (ret)
  84                 return ret;
  85
  86         page = sg_page(so->obj->pages->sgl);
  87         d = kmap(page);
  88
  89         while (i < rodata->batch_items) {
  90                 u32 s = rodata->batch[i];
  91
  92                 if (i * 4  == rodata->reloc[reloc_index]) {
  93                         u64 r = s + so->ggtt_offset;
  94                         s = lower_32_bits(r);
  95                         if (so->gen >= 8) {
  96                                 if (i + 1 >= rodata->batch_items ||
  97                                     rodata->batch[i + 1] != 0)
  98                                         return -EINVAL;
  99
 100                                 d[i++] = s;
 101                                 s = upper_32_bits(r);
 102                         }
 103
 104                         reloc_index++;
 105                 }
 106
 107                 d[i++] = s;
 108         }
 109         kunmap(page);
 110
 111         ret = i915_gem_object_set_to_gtt_domain(so->obj, false);
 112         if (ret)
 113                 return ret;
 114
 115         if (rodata->reloc[reloc_index] != -1) {
 116                 DRM_ERROR("only %d relocs resolved\n", reloc_index);
 117                 return -EINVAL;
 118         }
 119
 120         return 0;
 121 }
 122
 123 void i915_gem_render_state_fini(struct render_state *so)
 124 {
 125         i915_gem_object_ggtt_unpin(so->obj);
 126         drm_gem_object_unreference(&so->obj->base);
 127 }
 128
 129 int i915_gem_render_state_prepare(struct intel_engine_cs *ring,
 130                                   struct render_state *so)
 131 {
 132         int ret;
 133
 134         if (WARN_ON(ring->id != RCS))
 135                 return -ENOENT;
 136
 137         ret = render_state_init(so, ring->dev);
 138         if (ret)
 139                 return ret;
 140
 141         if (so->rodata == NULL)
 142                 return 0;
 143
 144         ret = render_state_setup(so);
 145         if (ret) {
 146                 i915_gem_render_state_fini(so);
 147                 return ret;
 148         }
 149
 150         return 0;
 151 }
 152
 153 int i915_gem_render_state_init(struct intel_engine_cs *ring)
 154 {
 155         struct render_state so;
 156         int ret;
 157
 158         ret = i915_gem_render_state_prepare(ring, &so);
 159         if (ret)
 160                 return ret;
 161
 162         if (so.rodata == NULL)
 163                 return 0;
 164
 165         ret = ring->dispatch_execbuffer(ring,
 166                                         so.ggtt_offset,
 167                                         so.rodata->batch_items * 4,
 168                                         I915_DISPATCH_SECURE);
 169         if (ret)
 170                 goto out;
 171
 172         i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), ring);
 173
 174         ret = __i915_add_request(ring, NULL, so.obj, NULL);
 175         /* __i915_add_request moves object to inactive if it fails */
 176 out:
 177         i915_gem_render_state_fini(&so);
 178         return ret;
 179 }