kernel/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         case 9:
  42                 return &gen9_null_state;
  43         }
  44
  45         return NULL;
  46 }
  47
  48 static int render_state_init(struct render_state *so, struct drm_device *dev)
  49 {
  50         int ret;
  51
  52         so->gen = INTEL_INFO(dev)->gen;
  53         so->rodata = render_state_get_rodata(dev, so->gen);
  54         if (so->rodata == NULL)
  55                 return 0;
  56
  57         if (so->rodata->batch_items * 4 > 4096)
  58                 return -EINVAL;
  59
  60         so->obj = i915_gem_alloc_object(dev, 4096);
  61         if (so->obj == NULL)
  62                 return -ENOMEM;
  63
  64         ret = i915_gem_obj_ggtt_pin(so->obj, 4096, 0);
  65         if (ret)
  66                 goto free_gem;
  67
  68         so->ggtt_offset = i915_gem_obj_ggtt_offset(so->obj);
  69         return 0;
  70
  71 free_gem:
  72         drm_gem_object_unreference(&so->obj->base);
  73         return ret;
  74 }
  75
  76 static int render_state_setup(struct render_state *so)
  77 {
  78         const struct intel_renderstate_rodata *rodata = so->rodata;
  79         unsigned int i = 0, reloc_index = 0;
  80         struct page *page;
  81         u32 *d;
  82         int ret;
  83
  84         ret = i915_gem_object_set_to_cpu_domain(so->obj, true);
  85         if (ret)
  86                 return ret;
  87
  88         page = sg_page(so->obj->pages->sgl);
  89         d = kmap(page);
  90
  91         while (i < rodata->batch_items) {
  92                 u32 s = rodata->batch[i];
  93
  94                 if (i * 4  == rodata->reloc[reloc_index]) {
  95                         u64 r = s + so->ggtt_offset;
  96                         s = lower_32_bits(r);
  97                         if (so->gen >= 8) {
  98                                 if (i + 1 >= rodata->batch_items ||
  99                                     rodata->batch[i + 1] != 0)
 100                                         return -EINVAL;
 101
 102                                 d[i++] = s;
 103                                 s = upper_32_bits(r);
 104                         }
 105
 106                         reloc_index++;
 107                 }
 108
 109                 d[i++] = s;
 110         }
 111         kunmap(page);
 112
 113         ret = i915_gem_object_set_to_gtt_domain(so->obj, false);
 114         if (ret)
 115                 return ret;
 116
 117         if (rodata->reloc[reloc_index] != -1) {
 118                 DRM_ERROR("only %d relocs resolved\n", reloc_index);
 119                 return -EINVAL;
 120         }
 121
 122         return 0;
 123 }
 124
 125 void i915_gem_render_state_fini(struct render_state *so)
 126 {
 127         i915_gem_object_ggtt_unpin(so->obj);
 128         drm_gem_object_unreference(&so->obj->base);
 129 }
 130
 131 int i915_gem_render_state_prepare(struct intel_engine_cs *ring,
 132                                   struct render_state *so)
 133 {
 134         int ret;
 135
 136         if (WARN_ON(ring->id != RCS))
 137                 return -ENOENT;
 138
 139         ret = render_state_init(so, ring->dev);
 140         if (ret)
 141                 return ret;
 142
 143         if (so->rodata == NULL)
 144                 return 0;
 145
 146         ret = render_state_setup(so);
 147         if (ret) {
 148                 i915_gem_render_state_fini(so);
 149                 return ret;
 150         }
 151
 152         return 0;
 153 }
 154
 155 int i915_gem_render_state_init(struct intel_engine_cs *ring)
 156 {
 157         struct render_state so;
 158         int ret;
 159
 160         ret = i915_gem_render_state_prepare(ring, &so);
 161         if (ret)
 162                 return ret;
 163
 164         if (so.rodata == NULL)
 165                 return 0;
 166
 167         ret = ring->dispatch_execbuffer(ring,
 168                                         so.ggtt_offset,
 169                                         so.rodata->batch_items * 4,
 170                                         I915_DISPATCH_SECURE);
 171         if (ret)
 172                 goto out;
 173
 174         i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), ring);
 175
 176         ret = __i915_add_request(ring, NULL, so.obj);
 177         /* __i915_add_request moves object to inactive if it fails */
 178 out:
 179         i915_gem_render_state_fini(&so);
 180         return ret;
 181 }