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 intel_render_state {
  32         const struct intel_renderstate_rodata *rodata;
  33         struct i915_vma *vma;
  34         u32 batch_offset;
  35         u32 batch_size;
  36         u32 aux_offset;
  37         u32 aux_size;
  38 };
  39
  40 static const struct intel_renderstate_rodata *
  41 render_state_get_rodata(const struct intel_engine_cs *engine)
  42 {
  43         switch (INTEL_GEN(engine->i915)) {
  44         case 6:
  45                 return &gen6_null_state;
  46         case 7:
  47                 return &gen7_null_state;
  48         case 8:
  49                 return &gen8_null_state;
  50         case 9:
  51                 return &gen9_null_state;
  52         }
  53
  54         return NULL;
  55 }
  56
  57 /*
  58  * Macro to add commands to auxiliary batch.
  59  * This macro only checks for page overflow before inserting the commands,
  60  * this is sufficient as the null state generator makes the final batch
  61  * with two passes to build command and state separately. At this point
  62  * the size of both are known and it compacts them by relocating the state
  63  * right after the commands taking care of alignment so we should sufficient
  64  * space below them for adding new commands.
  65  */
  66 #define OUT_BATCH(batch, i, val)                                \
  67         do {                                                    \
  68                 if ((i) >= PAGE_SIZE / sizeof(u32))             \
  69                         goto err;                               \
  70                 (batch)[(i)++] = (val);                         \
  71         } while(0)
  72
  73 static int render_state_setup(struct intel_render_state *so,
  74                               struct drm_i915_private *i915)
  75 {
  76         const struct intel_renderstate_rodata *rodata = so->rodata;
  77         struct drm_i915_gem_object *obj = so->vma->obj;
  78         unsigned int i = 0, reloc_index = 0;
  79         unsigned int needs_clflush;
  80         u32 *d;
  81         int ret;
  82
  83         ret = i915_gem_obj_prepare_shmem_write(obj, &needs_clflush);
  84         if (ret)
  85                 return ret;
  86
  87         d = kmap_atomic(i915_gem_object_get_dirty_page(obj, 0));
  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->vma->node.start;
  94                         s = lower_32_bits(r);
  95                         if (HAS_64BIT_RELOC(i915)) {
  96                                 if (i + 1 >= rodata->batch_items ||
  97                                     rodata->batch[i + 1] != 0)
  98                                         goto err;
  99
 100                                 d[i++] = s;
 101                                 s = upper_32_bits(r);
 102                         }
 103
 104                         reloc_index++;
 105                 }
 106
 107                 d[i++] = s;
 108         }
 109
 110         if (rodata->reloc[reloc_index] != -1) {
 111                 DRM_ERROR("only %d relocs resolved\n", reloc_index);
 112                 goto err;
 113         }
 114
 115         so->batch_offset = so->vma->node.start;
 116         so->batch_size = rodata->batch_items * sizeof(u32);
 117
 118         while (i % CACHELINE_DWORDS)
 119                 OUT_BATCH(d, i, MI_NOOP);
 120
 121         so->aux_offset = i * sizeof(u32);
 122
 123         if (HAS_POOLED_EU(i915)) {
 124                 /*
 125                  * We always program 3x6 pool config but depending upon which
 126                  * subslice is disabled HW drops down to appropriate config
 127                  * shown below.
 128                  *
 129                  * In the below table 2x6 config always refers to
 130                  * fused-down version, native 2x6 is not available and can
 131                  * be ignored
 132                  *
 133                  * SNo  subslices config                eu pool configuration
 134                  * -----------------------------------------------------------
 135                  * 1    3 subslices enabled (3x6)  -    0x00777000  (9+9)
 136                  * 2    ss0 disabled (2x6)         -    0x00777000  (3+9)
 137                  * 3    ss1 disabled (2x6)         -    0x00770000  (6+6)
 138                  * 4    ss2 disabled (2x6)         -    0x00007000  (9+3)
 139                  */
 140                 u32 eu_pool_config = 0x00777000;
 141
 142                 OUT_BATCH(d, i, GEN9_MEDIA_POOL_STATE);
 143                 OUT_BATCH(d, i, GEN9_MEDIA_POOL_ENABLE);
 144                 OUT_BATCH(d, i, eu_pool_config);
 145                 OUT_BATCH(d, i, 0);
 146                 OUT_BATCH(d, i, 0);
 147                 OUT_BATCH(d, i, 0);
 148         }
 149
 150         OUT_BATCH(d, i, MI_BATCH_BUFFER_END);
 151         so->aux_size = i * sizeof(u32) - so->aux_offset;
 152         so->aux_offset += so->batch_offset;
 153         /*
 154          * Since we are sending length, we need to strictly conform to
 155          * all requirements. For Gen2 this must be a multiple of 8.
 156          */
 157         so->aux_size = ALIGN(so->aux_size, 8);
 158
 159         if (needs_clflush)
 160                 drm_clflush_virt_range(d, i * sizeof(u32));
 161         kunmap_atomic(d);
 162
 163         ret = i915_gem_object_set_to_gtt_domain(obj, false);
 164 out:
 165         i915_gem_obj_finish_shmem_access(obj);
 166         return ret;
 167
 168 err:
 169         kunmap_atomic(d);
 170         ret = -EINVAL;
 171         goto out;
 172 }
 173
 174 #undef OUT_BATCH
 175
 176 int i915_gem_render_state_init(struct intel_engine_cs *engine)
 177 {
 178         struct intel_render_state *so;
 179         const struct intel_renderstate_rodata *rodata;
 180         struct drm_i915_gem_object *obj;
 181         int ret;
 182
 183         if (engine->id != RCS)
 184                 return 0;
 185
 186         rodata = render_state_get_rodata(engine);
 187         if (!rodata)
 188                 return 0;
 189
 190         if (rodata->batch_items * 4 > PAGE_SIZE)
 191                 return -EINVAL;
 192
 193         so = kmalloc(sizeof(*so), GFP_KERNEL);
 194         if (!so)
 195                 return -ENOMEM;
 196
 197         obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
 198         if (IS_ERR(obj)) {
 199                 ret = PTR_ERR(obj);
 200                 goto err_free;
 201         }
 202
 203         so->vma = i915_vma_instance(obj, &engine->i915->ggtt.base, NULL);
 204         if (IS_ERR(so->vma)) {
 205                 ret = PTR_ERR(so->vma);
 206                 goto err_obj;
 207         }
 208
 209         so->rodata = rodata;
 210         engine->render_state = so;
 211         return 0;
 212
 213 err_obj:
 214         i915_gem_object_put(obj);
 215 err_free:
 216         kfree(so);
 217         return ret;
 218 }
 219
 220 int i915_gem_render_state_emit(struct drm_i915_gem_request *req)
 221 {
 222         struct intel_render_state *so;
 223         int ret;
 224
 225         lockdep_assert_held(&req->i915->drm.struct_mutex);
 226
 227         so = req->engine->render_state;
 228         if (!so)
 229                 return 0;
 230
 231         /* Recreate the page after shrinking */
 232         if (!so->vma->obj->mm.pages)
 233                 so->batch_offset = -1;
 234
 235         ret = i915_vma_pin(so->vma, 0, 0, PIN_GLOBAL | PIN_HIGH);
 236         if (ret)
 237                 return ret;
 238
 239         if (so->vma->node.start != so->batch_offset) {
 240                 ret = render_state_setup(so, req->i915);
 241                 if (ret)
 242                         goto err_unpin;
 243         }
 244
 245         ret = req->engine->emit_flush(req, EMIT_INVALIDATE);
 246         if (ret)
 247                 goto err_unpin;
 248
 249         ret = req->engine->emit_bb_start(req,
 250                                          so->batch_offset, so->batch_size,
 251                                          I915_DISPATCH_SECURE);
 252         if (ret)
 253                 goto err_unpin;
 254
 255         if (so->aux_size > 8) {
 256                 ret = req->engine->emit_bb_start(req,
 257                                                  so->aux_offset, so->aux_size,
 258                                                  I915_DISPATCH_SECURE);
 259                 if (ret)
 260                         goto err_unpin;
 261         }
 262
 263         i915_vma_move_to_active(so->vma, req, 0);
 264 err_unpin:
 265         i915_vma_unpin(so->vma);
 266         return ret;
 267 }
 268
 269 void i915_gem_render_state_fini(struct intel_engine_cs *engine)
 270 {
 271         struct intel_render_state *so;
 272         struct drm_i915_gem_object *obj;
 273
 274         so = fetch_and_zero(&engine->render_state);
 275         if (!so)
 276                 return;
 277
 278         obj = so->vma->obj;
 279
 280         i915_vma_close(so->vma);
 281         __i915_gem_object_release_unless_active(obj);
 282
 283         kfree(so);
 284 }