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 struct i915_render_state {
  32         struct drm_i915_gem_object *obj;
  33         unsigned long ggtt_offset;
  34         u32 *batch;
  35         u32 size;
  36         u32 len;
  37 };
  38
  39 static struct i915_render_state *render_state_alloc(struct drm_device *dev)
  40 {
  41         struct i915_render_state *so;
  42         struct page *page;
  43         int ret;
  44
  45         so = kzalloc(sizeof(*so), GFP_KERNEL);
  46         if (!so)
  47                 return ERR_PTR(-ENOMEM);
  48
  49         so->obj = i915_gem_alloc_object(dev, 4096);
  50         if (so->obj == NULL) {
  51                 ret = -ENOMEM;
  52                 goto free;
  53         }
  54         so->size = 4096;
  55
  56         ret = i915_gem_obj_ggtt_pin(so->obj, 4096, 0);
  57         if (ret)
  58                 goto free_gem;
  59
  60         BUG_ON(so->obj->pages->nents != 1);
  61         page = sg_page(so->obj->pages->sgl);
  62
  63         so->batch = kmap(page);
  64         if (!so->batch) {
  65                 ret = -ENOMEM;
  66                 goto unpin;
  67         }
  68
  69         so->ggtt_offset = i915_gem_obj_ggtt_offset(so->obj);
  70
  71         return so;
  72 unpin:
  73         i915_gem_object_ggtt_unpin(so->obj);
  74 free_gem:
  75         drm_gem_object_unreference(&so->obj->base);
  76 free:
  77         kfree(so);
  78         return ERR_PTR(ret);
  79 }
  80
  81 static void render_state_free(struct i915_render_state *so)
  82 {
  83         kunmap(kmap_to_page(so->batch));
  84         i915_gem_object_ggtt_unpin(so->obj);
  85         drm_gem_object_unreference(&so->obj->base);
  86         kfree(so);
  87 }
  88
  89 static const struct intel_renderstate_rodata *
  90 render_state_get_rodata(struct drm_device *dev, const int gen)
  91 {
  92         switch (gen) {
  93         case 6:
  94                 return &gen6_null_state;
  95         case 7:
  96                 return &gen7_null_state;
  97         case 8:
  98                 return &gen8_null_state;
  99         }
 100
 101         return NULL;
 102 }
 103
 104 static int render_state_setup(const int gen,
 105                               const struct intel_renderstate_rodata *rodata,
 106                               struct i915_render_state *so)
 107 {
 108         const u64 goffset = i915_gem_obj_ggtt_offset(so->obj);
 109         u32 reloc_index = 0;
 110         u32 * const d = so->batch;
 111         unsigned int i = 0;
 112         int ret;
 113
 114         if (!rodata || rodata->batch_items * 4 > so->size)
 115                 return -EINVAL;
 116
 117         ret = i915_gem_object_set_to_cpu_domain(so->obj, true);
 118         if (ret)
 119                 return ret;
 120
 121         while (i < rodata->batch_items) {
 122                 u32 s = rodata->batch[i];
 123
 124                 if (reloc_index < rodata->reloc_items &&
 125                     i * 4  == rodata->reloc[reloc_index]) {
 126
 127                         s += goffset & 0xffffffff;
 128
 129                         /* We keep batch offsets max 32bit */
 130                         if (gen >= 8) {
 131                                 if (i + 1 >= rodata->batch_items ||
 132                                     rodata->batch[i + 1] != 0)
 133                                         return -EINVAL;
 134
 135                                 d[i] = s;
 136                                 i++;
 137                                 s = (goffset & 0xffffffff00000000ull) >> 32;
 138                         }
 139
 140                         reloc_index++;
 141                 }
 142
 143                 d[i] = s;
 144                 i++;
 145         }
 146
 147         ret = i915_gem_object_set_to_gtt_domain(so->obj, false);
 148         if (ret)
 149                 return ret;
 150
 151         if (rodata->reloc_items != reloc_index) {
 152                 DRM_ERROR("not all relocs resolved, %d out of %d\n",
 153                           reloc_index, rodata->reloc_items);
 154                 return -EINVAL;
 155         }
 156
 157         so->len = rodata->batch_items * 4;
 158
 159         return 0;
 160 }
 161
 162 int i915_gem_render_state_init(struct intel_engine_cs *ring)
 163 {
 164         const int gen = INTEL_INFO(ring->dev)->gen;
 165         struct i915_render_state *so;
 166         const struct intel_renderstate_rodata *rodata;
 167         int ret;
 168
 169         if (WARN_ON(ring->id != RCS))
 170                 return -ENOENT;
 171
 172         rodata = render_state_get_rodata(ring->dev, gen);
 173         if (rodata == NULL)
 174                 return 0;
 175
 176         so = render_state_alloc(ring->dev);
 177         if (IS_ERR(so))
 178                 return PTR_ERR(so);
 179
 180         ret = render_state_setup(gen, rodata, so);
 181         if (ret)
 182                 goto out;
 183
 184         ret = ring->dispatch_execbuffer(ring,
 185                                         i915_gem_obj_ggtt_offset(so->obj),
 186                                         so->len,
 187                                         I915_DISPATCH_SECURE);
 188         if (ret)
 189                 goto out;
 190
 191         i915_vma_move_to_active(i915_gem_obj_to_ggtt(so->obj), ring);
 192
 193         ret = __i915_add_request(ring, NULL, so->obj, NULL);
 194         /* __i915_add_request moves object to inactive if it fails */
 195 out:
 196         render_state_free(so);
 197         return ret;
 198 }