drivers/gpu/drm/i915/gvt/mmio_context.c

   1 /*
   2  * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
   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 FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eddie Dong <eddie.dong@intel.com>
  25  *    Kevin Tian <kevin.tian@intel.com>
  26  *
  27  * Contributors:
  28  *    Zhi Wang <zhi.a.wang@intel.com>
  29  *    Changbin Du <changbin.du@intel.com>
  30  *    Zhenyu Wang <zhenyuw@linux.intel.com>
  31  *    Tina Zhang <tina.zhang@intel.com>
  32  *    Bing Niu <bing.niu@intel.com>
  33  *
  34  */
  35
  36 #include "i915_drv.h"
  37 #include "gvt.h"
  38 #include "trace.h"
  39
  40 #define GEN9_MOCS_SIZE          64
  41
  42 /* Raw offset is appened to each line for convenience. */
  43 static struct engine_mmio gen8_engine_mmio_list[] __cacheline_aligned = {
  44         {RCS0, GFX_MODE_GEN7, 0xffff, false}, /* 0x229c */
  45         {RCS0, GEN9_CTX_PREEMPT_REG, 0x0, false}, /* 0x2248 */
  46         {RCS0, HWSTAM, 0x0, false}, /* 0x2098 */
  47         {RCS0, INSTPM, 0xffff, true}, /* 0x20c0 */
  48         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 0), 0, false}, /* 0x24d0 */
  49         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 1), 0, false}, /* 0x24d4 */
  50         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 2), 0, false}, /* 0x24d8 */
  51         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 3), 0, false}, /* 0x24dc */
  52         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 4), 0, false}, /* 0x24e0 */
  53         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 5), 0, false}, /* 0x24e4 */
  54         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 6), 0, false}, /* 0x24e8 */
  55         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 7), 0, false}, /* 0x24ec */
  56         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 8), 0, false}, /* 0x24f0 */
  57         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 9), 0, false}, /* 0x24f4 */
  58         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 10), 0, false}, /* 0x24f8 */
  59         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 11), 0, false}, /* 0x24fc */
  60         {RCS0, CACHE_MODE_1, 0xffff, true}, /* 0x7004 */
  61         {RCS0, GEN7_GT_MODE, 0xffff, true}, /* 0x7008 */
  62         {RCS0, CACHE_MODE_0_GEN7, 0xffff, true}, /* 0x7000 */
  63         {RCS0, GEN7_COMMON_SLICE_CHICKEN1, 0xffff, true}, /* 0x7010 */
  64         {RCS0, HDC_CHICKEN0, 0xffff, true}, /* 0x7300 */
  65         {RCS0, VF_GUARDBAND, 0xffff, true}, /* 0x83a4 */
  66
  67         {BCS0, RING_GFX_MODE(BLT_RING_BASE), 0xffff, false}, /* 0x2229c */
  68         {BCS0, RING_MI_MODE(BLT_RING_BASE), 0xffff, false}, /* 0x2209c */
  69         {BCS0, RING_INSTPM(BLT_RING_BASE), 0xffff, false}, /* 0x220c0 */
  70         {BCS0, RING_HWSTAM(BLT_RING_BASE), 0x0, false}, /* 0x22098 */
  71         {BCS0, RING_EXCC(BLT_RING_BASE), 0xffff, false}, /* 0x22028 */
  72         {RCS0, INVALID_MMIO_REG, 0, false } /* Terminated */
  73 };
  74
  75 static struct engine_mmio gen9_engine_mmio_list[] __cacheline_aligned = {
  76         {RCS0, GFX_MODE_GEN7, 0xffff, false}, /* 0x229c */
  77         {RCS0, GEN9_CTX_PREEMPT_REG, 0x0, false}, /* 0x2248 */
  78         {RCS0, HWSTAM, 0x0, false}, /* 0x2098 */
  79         {RCS0, INSTPM, 0xffff, true}, /* 0x20c0 */
  80         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 0), 0, false}, /* 0x24d0 */
  81         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 1), 0, false}, /* 0x24d4 */
  82         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 2), 0, false}, /* 0x24d8 */
  83         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 3), 0, false}, /* 0x24dc */
  84         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 4), 0, false}, /* 0x24e0 */
  85         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 5), 0, false}, /* 0x24e4 */
  86         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 6), 0, false}, /* 0x24e8 */
  87         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 7), 0, false}, /* 0x24ec */
  88         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 8), 0, false}, /* 0x24f0 */
  89         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 9), 0, false}, /* 0x24f4 */
  90         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 10), 0, false}, /* 0x24f8 */
  91         {RCS0, RING_FORCE_TO_NONPRIV(RENDER_RING_BASE, 11), 0, false}, /* 0x24fc */
  92         {RCS0, CACHE_MODE_1, 0xffff, true}, /* 0x7004 */
  93         {RCS0, GEN7_GT_MODE, 0xffff, true}, /* 0x7008 */
  94         {RCS0, CACHE_MODE_0_GEN7, 0xffff, true}, /* 0x7000 */
  95         {RCS0, GEN7_COMMON_SLICE_CHICKEN1, 0xffff, true}, /* 0x7010 */
  96         {RCS0, HDC_CHICKEN0, 0xffff, true}, /* 0x7300 */
  97         {RCS0, VF_GUARDBAND, 0xffff, true}, /* 0x83a4 */
  98
  99         {RCS0, GEN8_PRIVATE_PAT_LO, 0, false}, /* 0x40e0 */
 100         {RCS0, GEN8_PRIVATE_PAT_HI, 0, false}, /* 0x40e4 */
 101         {RCS0, GEN8_CS_CHICKEN1, 0xffff, true}, /* 0x2580 */
 102         {RCS0, COMMON_SLICE_CHICKEN2, 0xffff, true}, /* 0x7014 */
 103         {RCS0, GEN9_CS_DEBUG_MODE1, 0xffff, false}, /* 0x20ec */
 104         {RCS0, GEN8_L3SQCREG4, 0, false}, /* 0xb118 */
 105         {RCS0, GEN7_HALF_SLICE_CHICKEN1, 0xffff, true}, /* 0xe100 */
 106         {RCS0, HALF_SLICE_CHICKEN2, 0xffff, true}, /* 0xe180 */
 107         {RCS0, HALF_SLICE_CHICKEN3, 0xffff, true}, /* 0xe184 */
 108         {RCS0, GEN9_HALF_SLICE_CHICKEN5, 0xffff, true}, /* 0xe188 */
 109         {RCS0, GEN9_HALF_SLICE_CHICKEN7, 0xffff, true}, /* 0xe194 */
 110         {RCS0, GEN8_ROW_CHICKEN, 0xffff, true}, /* 0xe4f0 */
 111         {RCS0, TRVATTL3PTRDW(0), 0, true}, /* 0x4de0 */
 112         {RCS0, TRVATTL3PTRDW(1), 0, true}, /* 0x4de4 */
 113         {RCS0, TRNULLDETCT, 0, true}, /* 0x4de8 */
 114         {RCS0, TRINVTILEDETCT, 0, true}, /* 0x4dec */
 115         {RCS0, TRVADR, 0, true}, /* 0x4df0 */
 116         {RCS0, TRTTE, 0, true}, /* 0x4df4 */
 117         {RCS0, _MMIO(0x4dfc), 0, true},
 118
 119         {BCS0, RING_GFX_MODE(BLT_RING_BASE), 0xffff, false}, /* 0x2229c */
 120         {BCS0, RING_MI_MODE(BLT_RING_BASE), 0xffff, false}, /* 0x2209c */
 121         {BCS0, RING_INSTPM(BLT_RING_BASE), 0xffff, false}, /* 0x220c0 */
 122         {BCS0, RING_HWSTAM(BLT_RING_BASE), 0x0, false}, /* 0x22098 */
 123         {BCS0, RING_EXCC(BLT_RING_BASE), 0xffff, false}, /* 0x22028 */
 124
 125         {VCS1, RING_EXCC(GEN8_BSD2_RING_BASE), 0xffff, false}, /* 0x1c028 */
 126
 127         {VECS0, RING_EXCC(VEBOX_RING_BASE), 0xffff, false}, /* 0x1a028 */
 128
 129         {RCS0, GEN8_HDC_CHICKEN1, 0xffff, true}, /* 0x7304 */
 130         {RCS0, GEN9_CTX_PREEMPT_REG, 0x0, false}, /* 0x2248 */
 131         {RCS0, GEN7_UCGCTL4, 0x0, false}, /* 0x940c */
 132         {RCS0, GAMT_CHKN_BIT_REG, 0x0, false}, /* 0x4ab8 */
 133
 134         {RCS0, GEN9_GAMT_ECO_REG_RW_IA, 0x0, false}, /* 0x4ab0 */
 135         {RCS0, GEN9_CSFE_CHICKEN1_RCS, 0xffff, false}, /* 0x20d4 */
 136         {RCS0, _MMIO(0x20D8), 0xffff, true}, /* 0x20d8 */
 137
 138         {RCS0, GEN8_GARBCNTL, 0x0, false}, /* 0xb004 */
 139         {RCS0, GEN7_FF_THREAD_MODE, 0x0, false}, /* 0x20a0 */
 140         {RCS0, FF_SLICE_CS_CHICKEN2, 0xffff, false}, /* 0x20e4 */
 141         {RCS0, INVALID_MMIO_REG, 0, false } /* Terminated */
 142 };
 143
 144 static struct {
 145         bool initialized;
 146         u32 control_table[I915_NUM_ENGINES][GEN9_MOCS_SIZE];
 147         u32 l3cc_table[GEN9_MOCS_SIZE / 2];
 148 } gen9_render_mocs;
 149
 150 static void load_render_mocs(struct drm_i915_private *dev_priv)
 151 {
 152         i915_reg_t offset;
 153         u32 regs[] = {
 154                 [RCS0]  = 0xc800,
 155                 [VCS0]  = 0xc900,
 156                 [VCS1]  = 0xca00,
 157                 [BCS0]  = 0xcc00,
 158                 [VECS0] = 0xcb00,
 159         };
 160         int ring_id, i;
 161
 162         for (ring_id = 0; ring_id < ARRAY_SIZE(regs); ring_id++) {
 163                 if (!HAS_ENGINE(dev_priv, ring_id))
 164                         continue;
 165                 offset.reg = regs[ring_id];
 166                 for (i = 0; i < GEN9_MOCS_SIZE; i++) {
 167                         gen9_render_mocs.control_table[ring_id][i] =
 168                                 I915_READ_FW(offset);
 169                         offset.reg += 4;
 170                 }
 171         }
 172
 173         offset.reg = 0xb020;
 174         for (i = 0; i < GEN9_MOCS_SIZE / 2; i++) {
 175                 gen9_render_mocs.l3cc_table[i] =
 176                         I915_READ_FW(offset);
 177                 offset.reg += 4;
 178         }
 179         gen9_render_mocs.initialized = true;
 180 }
 181
 182 static int
 183 restore_context_mmio_for_inhibit(struct intel_vgpu *vgpu,
 184                                  struct i915_request *req)
 185 {
 186         u32 *cs;
 187         int ret;
 188         struct engine_mmio *mmio;
 189         struct intel_gvt *gvt = vgpu->gvt;
 190         int ring_id = req->engine->id;
 191         int count = gvt->engine_mmio_list.ctx_mmio_count[ring_id];
 192
 193         if (count == 0)
 194                 return 0;
 195
 196         ret = req->engine->emit_flush(req, EMIT_BARRIER);
 197         if (ret)
 198                 return ret;
 199
 200         cs = intel_ring_begin(req, count * 2 + 2);
 201         if (IS_ERR(cs))
 202                 return PTR_ERR(cs);
 203
 204         *cs++ = MI_LOAD_REGISTER_IMM(count);
 205         for (mmio = gvt->engine_mmio_list.mmio;
 206              i915_mmio_reg_valid(mmio->reg); mmio++) {
 207                 if (mmio->ring_id != ring_id ||
 208                     !mmio->in_context)
 209                         continue;
 210
 211                 *cs++ = i915_mmio_reg_offset(mmio->reg);
 212                 *cs++ = vgpu_vreg_t(vgpu, mmio->reg) |
 213                                 (mmio->mask << 16);
 214                 gvt_dbg_core("add lri reg pair 0x%x:0x%x in inhibit ctx, vgpu:%d, rind_id:%d\n",
 215                               *(cs-2), *(cs-1), vgpu->id, ring_id);
 216         }
 217
 218         *cs++ = MI_NOOP;
 219         intel_ring_advance(req, cs);
 220
 221         ret = req->engine->emit_flush(req, EMIT_BARRIER);
 222         if (ret)
 223                 return ret;
 224
 225         return 0;
 226 }
 227
 228 static int
 229 restore_render_mocs_control_for_inhibit(struct intel_vgpu *vgpu,
 230                                         struct i915_request *req)
 231 {
 232         unsigned int index;
 233         u32 *cs;
 234
 235         cs = intel_ring_begin(req, 2 * GEN9_MOCS_SIZE + 2);
 236         if (IS_ERR(cs))
 237                 return PTR_ERR(cs);
 238
 239         *cs++ = MI_LOAD_REGISTER_IMM(GEN9_MOCS_SIZE);
 240
 241         for (index = 0; index < GEN9_MOCS_SIZE; index++) {
 242                 *cs++ = i915_mmio_reg_offset(GEN9_GFX_MOCS(index));
 243                 *cs++ = vgpu_vreg_t(vgpu, GEN9_GFX_MOCS(index));
 244                 gvt_dbg_core("add lri reg pair 0x%x:0x%x in inhibit ctx, vgpu:%d, rind_id:%d\n",
 245                               *(cs-2), *(cs-1), vgpu->id, req->engine->id);
 246
 247         }
 248
 249         *cs++ = MI_NOOP;
 250         intel_ring_advance(req, cs);
 251
 252         return 0;
 253 }
 254
 255 static int
 256 restore_render_mocs_l3cc_for_inhibit(struct intel_vgpu *vgpu,
 257                                      struct i915_request *req)
 258 {
 259         unsigned int index;
 260         u32 *cs;
 261
 262         cs = intel_ring_begin(req, 2 * GEN9_MOCS_SIZE / 2 + 2);
 263         if (IS_ERR(cs))
 264                 return PTR_ERR(cs);
 265
 266         *cs++ = MI_LOAD_REGISTER_IMM(GEN9_MOCS_SIZE / 2);
 267
 268         for (index = 0; index < GEN9_MOCS_SIZE / 2; index++) {
 269                 *cs++ = i915_mmio_reg_offset(GEN9_LNCFCMOCS(index));
 270                 *cs++ = vgpu_vreg_t(vgpu, GEN9_LNCFCMOCS(index));
 271                 gvt_dbg_core("add lri reg pair 0x%x:0x%x in inhibit ctx, vgpu:%d, rind_id:%d\n",
 272                               *(cs-2), *(cs-1), vgpu->id, req->engine->id);
 273
 274         }
 275
 276         *cs++ = MI_NOOP;
 277         intel_ring_advance(req, cs);
 278
 279         return 0;
 280 }
 281
 282 /*
 283  * Use lri command to initialize the mmio which is in context state image for
 284  * inhibit context, it contains tracked engine mmio, render_mocs and
 285  * render_mocs_l3cc.
 286  */
 287 int intel_vgpu_restore_inhibit_context(struct intel_vgpu *vgpu,
 288                                        struct i915_request *req)
 289 {
 290         int ret;
 291         u32 *cs;
 292
 293         cs = intel_ring_begin(req, 2);
 294         if (IS_ERR(cs))
 295                 return PTR_ERR(cs);
 296
 297         *cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
 298         *cs++ = MI_NOOP;
 299         intel_ring_advance(req, cs);
 300
 301         ret = restore_context_mmio_for_inhibit(vgpu, req);
 302         if (ret)
 303                 goto out;
 304
 305         /* no MOCS register in context except render engine */
 306         if (req->engine->id != RCS0)
 307                 goto out;
 308
 309         ret = restore_render_mocs_control_for_inhibit(vgpu, req);
 310         if (ret)
 311                 goto out;
 312
 313         ret = restore_render_mocs_l3cc_for_inhibit(vgpu, req);
 314         if (ret)
 315                 goto out;
 316
 317 out:
 318         cs = intel_ring_begin(req, 2);
 319         if (IS_ERR(cs))
 320                 return PTR_ERR(cs);
 321
 322         *cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
 323         *cs++ = MI_NOOP;
 324         intel_ring_advance(req, cs);
 325
 326         return ret;
 327 }
 328
 329 static void handle_tlb_pending_event(struct intel_vgpu *vgpu, int ring_id)
 330 {
 331         struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 332         struct intel_uncore *uncore = &dev_priv->uncore;
 333         struct intel_vgpu_submission *s = &vgpu->submission;
 334         enum forcewake_domains fw;
 335         i915_reg_t reg;
 336         u32 regs[] = {
 337                 [RCS0]  = 0x4260,
 338                 [VCS0]  = 0x4264,
 339                 [VCS1]  = 0x4268,
 340                 [BCS0]  = 0x426c,
 341                 [VECS0] = 0x4270,
 342         };
 343
 344         if (WARN_ON(ring_id >= ARRAY_SIZE(regs)))
 345                 return;
 346
 347         if (!test_and_clear_bit(ring_id, (void *)s->tlb_handle_pending))
 348                 return;
 349
 350         reg = _MMIO(regs[ring_id]);
 351
 352         /* WaForceWakeRenderDuringMmioTLBInvalidate:skl
 353          * we need to put a forcewake when invalidating RCS TLB caches,
 354          * otherwise device can go to RC6 state and interrupt invalidation
 355          * process
 356          */
 357         fw = intel_uncore_forcewake_for_reg(uncore, reg,
 358                                             FW_REG_READ | FW_REG_WRITE);
 359         if (ring_id == RCS0 && INTEL_GEN(dev_priv) >= 9)
 360                 fw |= FORCEWAKE_RENDER;
 361
 362         intel_uncore_forcewake_get(uncore, fw);
 363
 364         intel_uncore_write_fw(uncore, reg, 0x1);
 365
 366         if (wait_for_atomic((intel_uncore_read_fw(uncore, reg) == 0), 50))
 367                 gvt_vgpu_err("timeout in invalidate ring (%d) tlb\n", ring_id);
 368         else
 369                 vgpu_vreg_t(vgpu, reg) = 0;
 370
 371         intel_uncore_forcewake_put(uncore, fw);
 372
 373         gvt_dbg_core("invalidate TLB for ring %d\n", ring_id);
 374 }
 375
 376 static void switch_mocs(struct intel_vgpu *pre, struct intel_vgpu *next,
 377                         int ring_id)
 378 {
 379         struct drm_i915_private *dev_priv;
 380         i915_reg_t offset, l3_offset;
 381         u32 old_v, new_v;
 382
 383         u32 regs[] = {
 384                 [RCS0]  = 0xc800,
 385                 [VCS0]  = 0xc900,
 386                 [VCS1]  = 0xca00,
 387                 [BCS0]  = 0xcc00,
 388                 [VECS0] = 0xcb00,
 389         };
 390         int i;
 391
 392         dev_priv = pre ? pre->gvt->dev_priv : next->gvt->dev_priv;
 393         if (WARN_ON(ring_id >= ARRAY_SIZE(regs)))
 394                 return;
 395
 396         if (ring_id == RCS0 && IS_GEN(dev_priv, 9))
 397                 return;
 398
 399         if (!pre && !gen9_render_mocs.initialized)
 400                 load_render_mocs(dev_priv);
 401
 402         offset.reg = regs[ring_id];
 403         for (i = 0; i < GEN9_MOCS_SIZE; i++) {
 404                 if (pre)
 405                         old_v = vgpu_vreg_t(pre, offset);
 406                 else
 407                         old_v = gen9_render_mocs.control_table[ring_id][i];
 408                 if (next)
 409                         new_v = vgpu_vreg_t(next, offset);
 410                 else
 411                         new_v = gen9_render_mocs.control_table[ring_id][i];
 412
 413                 if (old_v != new_v)
 414                         I915_WRITE_FW(offset, new_v);
 415
 416                 offset.reg += 4;
 417         }
 418
 419         if (ring_id == RCS0) {
 420                 l3_offset.reg = 0xb020;
 421                 for (i = 0; i < GEN9_MOCS_SIZE / 2; i++) {
 422                         if (pre)
 423                                 old_v = vgpu_vreg_t(pre, l3_offset);
 424                         else
 425                                 old_v = gen9_render_mocs.l3cc_table[i];
 426                         if (next)
 427                                 new_v = vgpu_vreg_t(next, l3_offset);
 428                         else
 429                                 new_v = gen9_render_mocs.l3cc_table[i];
 430
 431                         if (old_v != new_v)
 432                                 I915_WRITE_FW(l3_offset, new_v);
 433
 434                         l3_offset.reg += 4;
 435                 }
 436         }
 437 }
 438
 439 #define CTX_CONTEXT_CONTROL_VAL 0x03
 440
 441 bool is_inhibit_context(struct intel_context *ce)
 442 {
 443         const u32 *reg_state = ce->lrc_reg_state;
 444         u32 inhibit_mask =
 445                 _MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT);
 446
 447         return inhibit_mask ==
 448                 (reg_state[CTX_CONTEXT_CONTROL_VAL] & inhibit_mask);
 449 }
 450
 451 /* Switch ring mmio values (context). */
 452 static void switch_mmio(struct intel_vgpu *pre,
 453                         struct intel_vgpu *next,
 454                         int ring_id)
 455 {
 456         struct drm_i915_private *dev_priv;
 457         struct intel_vgpu_submission *s;
 458         struct engine_mmio *mmio;
 459         u32 old_v, new_v;
 460
 461         dev_priv = pre ? pre->gvt->dev_priv : next->gvt->dev_priv;
 462         if (INTEL_GEN(dev_priv) >= 9)
 463                 switch_mocs(pre, next, ring_id);
 464
 465         for (mmio = dev_priv->gvt->engine_mmio_list.mmio;
 466              i915_mmio_reg_valid(mmio->reg); mmio++) {
 467                 if (mmio->ring_id != ring_id)
 468                         continue;
 469                 /*
 470                  * No need to do save or restore of the mmio which is in context
 471                  * state image on gen9, it's initialized by lri command and
 472                  * save or restore with context together.
 473                  */
 474                 if (IS_GEN(dev_priv, 9) && mmio->in_context)
 475                         continue;
 476
 477                 // save
 478                 if (pre) {
 479                         vgpu_vreg_t(pre, mmio->reg) = I915_READ_FW(mmio->reg);
 480                         if (mmio->mask)
 481                                 vgpu_vreg_t(pre, mmio->reg) &=
 482                                                 ~(mmio->mask << 16);
 483                         old_v = vgpu_vreg_t(pre, mmio->reg);
 484                 } else
 485                         old_v = mmio->value = I915_READ_FW(mmio->reg);
 486
 487                 // restore
 488                 if (next) {
 489                         s = &next->submission;
 490                         /*
 491                          * No need to restore the mmio which is in context state
 492                          * image if it's not inhibit context, it will restore
 493                          * itself.
 494                          */
 495                         if (mmio->in_context &&
 496                             !is_inhibit_context(s->shadow[ring_id]))
 497                                 continue;
 498
 499                         if (mmio->mask)
 500                                 new_v = vgpu_vreg_t(next, mmio->reg) |
 501                                                         (mmio->mask << 16);
 502                         else
 503                                 new_v = vgpu_vreg_t(next, mmio->reg);
 504                 } else {
 505                         if (mmio->in_context)
 506                                 continue;
 507                         if (mmio->mask)
 508                                 new_v = mmio->value | (mmio->mask << 16);
 509                         else
 510                                 new_v = mmio->value;
 511                 }
 512
 513                 I915_WRITE_FW(mmio->reg, new_v);
 514
 515                 trace_render_mmio(pre ? pre->id : 0,
 516                                   next ? next->id : 0,
 517                                   "switch",
 518                                   i915_mmio_reg_offset(mmio->reg),
 519                                   old_v, new_v);
 520         }
 521
 522         if (next)
 523                 handle_tlb_pending_event(next, ring_id);
 524 }
 525
 526 /**
 527  * intel_gvt_switch_render_mmio - switch mmio context of specific engine
 528  * @pre: the last vGPU that own the engine
 529  * @next: the vGPU to switch to
 530  * @ring_id: specify the engine
 531  *
 532  * If pre is null indicates that host own the engine. If next is null
 533  * indicates that we are switching to host workload.
 534  */
 535 void intel_gvt_switch_mmio(struct intel_vgpu *pre,
 536                            struct intel_vgpu *next, int ring_id)
 537 {
 538         struct drm_i915_private *dev_priv;
 539
 540         if (WARN_ON(!pre && !next))
 541                 return;
 542
 543         gvt_dbg_render("switch ring %d from %s to %s\n", ring_id,
 544                        pre ? "vGPU" : "host", next ? "vGPU" : "HOST");
 545
 546         dev_priv = pre ? pre->gvt->dev_priv : next->gvt->dev_priv;
 547
 548         /**
 549          * We are using raw mmio access wrapper to improve the
 550          * performace for batch mmio read/write, so we need
 551          * handle forcewake mannually.
 552          */
 553         intel_uncore_forcewake_get(&dev_priv->uncore, FORCEWAKE_ALL);
 554         switch_mmio(pre, next, ring_id);
 555         intel_uncore_forcewake_put(&dev_priv->uncore, FORCEWAKE_ALL);
 556 }
 557
 558 /**
 559  * intel_gvt_init_engine_mmio_context - Initiate the engine mmio list
 560  * @gvt: GVT device
 561  *
 562  */
 563 void intel_gvt_init_engine_mmio_context(struct intel_gvt *gvt)
 564 {
 565         struct engine_mmio *mmio;
 566
 567         if (INTEL_GEN(gvt->dev_priv) >= 9)
 568                 gvt->engine_mmio_list.mmio = gen9_engine_mmio_list;
 569         else
 570                 gvt->engine_mmio_list.mmio = gen8_engine_mmio_list;
 571
 572         for (mmio = gvt->engine_mmio_list.mmio;
 573              i915_mmio_reg_valid(mmio->reg); mmio++) {
 574                 if (mmio->in_context) {
 575                         gvt->engine_mmio_list.ctx_mmio_count[mmio->ring_id]++;
 576                         intel_gvt_mmio_set_in_ctx(gvt, mmio->reg.reg);
 577                 }
 578         }
 579 }