drivers/gpu/drm/i915/gvt/aperture_gm.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  *    Kevin Tian <[email protected]>
  25  *    Dexuan Cui
  26  *
  27  * Contributors:
  28  *    Pei Zhang <[email protected]>
  29  *    Min He <[email protected]>
  30  *    Niu Bing <[email protected]>
  31  *    Yulei Zhang <[email protected]>
  32  *    Zhenyu Wang <[email protected]>
  33  *    Zhi Wang <[email protected]>
  34  *
  35  */
  36
  37 #include "i915_drv.h"
  38 #include "gvt.h"
  39
  40 static int alloc_gm(struct intel_vgpu *vgpu, bool high_gm)
  41 {
  42         struct intel_gvt *gvt = vgpu->gvt;
  43         struct drm_i915_private *dev_priv = gvt->dev_priv;
  44         unsigned int flags;
  45         u64 start, end, size;
  46         struct drm_mm_node *node;
  47         int ret;
  48
  49         if (high_gm) {
  50                 node = &vgpu->gm.high_gm_node;
  51                 size = vgpu_hidden_sz(vgpu);
  52                 start = ALIGN(gvt_hidden_gmadr_base(gvt), I915_GTT_PAGE_SIZE);
  53                 end = ALIGN(gvt_hidden_gmadr_end(gvt), I915_GTT_PAGE_SIZE);
  54                 flags = PIN_HIGH;
  55         } else {
  56                 node = &vgpu->gm.low_gm_node;
  57                 size = vgpu_aperture_sz(vgpu);
  58                 start = ALIGN(gvt_aperture_gmadr_base(gvt), I915_GTT_PAGE_SIZE);
  59                 end = ALIGN(gvt_aperture_gmadr_end(gvt), I915_GTT_PAGE_SIZE);
  60                 flags = PIN_MAPPABLE;
  61         }
  62
  63         mutex_lock(&dev_priv->drm.struct_mutex);
  64         mmio_hw_access_pre(dev_priv);
  65         ret = i915_gem_gtt_insert(&dev_priv->ggtt.vm, node,
  66                                   size, I915_GTT_PAGE_SIZE,
  67                                   I915_COLOR_UNEVICTABLE,
  68                                   start, end, flags);
  69         mmio_hw_access_post(dev_priv);
  70         mutex_unlock(&dev_priv->drm.struct_mutex);
  71         if (ret)
  72                 gvt_err("fail to alloc %s gm space from host\n",
  73                         high_gm ? "high" : "low");
  74
  75         return ret;
  76 }
  77
  78 static int alloc_vgpu_gm(struct intel_vgpu *vgpu)
  79 {
  80         struct intel_gvt *gvt = vgpu->gvt;
  81         struct drm_i915_private *dev_priv = gvt->dev_priv;
  82         int ret;
  83
  84         ret = alloc_gm(vgpu, false);
  85         if (ret)
  86                 return ret;
  87
  88         ret = alloc_gm(vgpu, true);
  89         if (ret)
  90                 goto out_free_aperture;
  91
  92         gvt_dbg_core("vgpu%d: alloc low GM start %llx size %llx\n", vgpu->id,
  93                      vgpu_aperture_offset(vgpu), vgpu_aperture_sz(vgpu));
  94
  95         gvt_dbg_core("vgpu%d: alloc high GM start %llx size %llx\n", vgpu->id,
  96                      vgpu_hidden_offset(vgpu), vgpu_hidden_sz(vgpu));
  97
  98         return 0;
  99 out_free_aperture:
 100         mutex_lock(&dev_priv->drm.struct_mutex);
 101         drm_mm_remove_node(&vgpu->gm.low_gm_node);
 102         mutex_unlock(&dev_priv->drm.struct_mutex);
 103         return ret;
 104 }
 105
 106 static void free_vgpu_gm(struct intel_vgpu *vgpu)
 107 {
 108         struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 109
 110         mutex_lock(&dev_priv->drm.struct_mutex);
 111         drm_mm_remove_node(&vgpu->gm.low_gm_node);
 112         drm_mm_remove_node(&vgpu->gm.high_gm_node);
 113         mutex_unlock(&dev_priv->drm.struct_mutex);
 114 }
 115
 116 /**
 117  * intel_vgpu_write_fence - write fence registers owned by a vGPU
 118  * @vgpu: vGPU instance
 119  * @fence: vGPU fence register number
 120  * @value: Fence register value to be written
 121  *
 122  * This function is used to write fence registers owned by a vGPU. The vGPU
 123  * fence register number will be translated into HW fence register number.
 124  *
 125  */
 126 void intel_vgpu_write_fence(struct intel_vgpu *vgpu,
 127                 u32 fence, u64 value)
 128 {
 129         struct intel_gvt *gvt = vgpu->gvt;
 130         struct drm_i915_private *dev_priv = gvt->dev_priv;
 131         struct drm_i915_fence_reg *reg;
 132         i915_reg_t fence_reg_lo, fence_reg_hi;
 133
 134         assert_rpm_wakelock_held(dev_priv);
 135
 136         if (WARN_ON(fence >= vgpu_fence_sz(vgpu)))
 137                 return;
 138
 139         reg = vgpu->fence.regs[fence];
 140         if (WARN_ON(!reg))
 141                 return;
 142
 143         fence_reg_lo = FENCE_REG_GEN6_LO(reg->id);
 144         fence_reg_hi = FENCE_REG_GEN6_HI(reg->id);
 145
 146         I915_WRITE(fence_reg_lo, 0);
 147         POSTING_READ(fence_reg_lo);
 148
 149         I915_WRITE(fence_reg_hi, upper_32_bits(value));
 150         I915_WRITE(fence_reg_lo, lower_32_bits(value));
 151         POSTING_READ(fence_reg_lo);
 152 }
 153
 154 static void _clear_vgpu_fence(struct intel_vgpu *vgpu)
 155 {
 156         int i;
 157
 158         for (i = 0; i < vgpu_fence_sz(vgpu); i++)
 159                 intel_vgpu_write_fence(vgpu, i, 0);
 160 }
 161
 162 static void free_vgpu_fence(struct intel_vgpu *vgpu)
 163 {
 164         struct intel_gvt *gvt = vgpu->gvt;
 165         struct drm_i915_private *dev_priv = gvt->dev_priv;
 166         struct drm_i915_fence_reg *reg;
 167         u32 i;
 168
 169         if (WARN_ON(!vgpu_fence_sz(vgpu)))
 170                 return;
 171
 172         intel_runtime_pm_get(dev_priv);
 173
 174         mutex_lock(&dev_priv->drm.struct_mutex);
 175         _clear_vgpu_fence(vgpu);
 176         for (i = 0; i < vgpu_fence_sz(vgpu); i++) {
 177                 reg = vgpu->fence.regs[i];
 178                 i915_unreserve_fence(reg);
 179                 vgpu->fence.regs[i] = NULL;
 180         }
 181         mutex_unlock(&dev_priv->drm.struct_mutex);
 182
 183         intel_runtime_pm_put(dev_priv);
 184 }
 185
 186 static int alloc_vgpu_fence(struct intel_vgpu *vgpu)
 187 {
 188         struct intel_gvt *gvt = vgpu->gvt;
 189         struct drm_i915_private *dev_priv = gvt->dev_priv;
 190         struct drm_i915_fence_reg *reg;
 191         int i;
 192
 193         intel_runtime_pm_get(dev_priv);
 194
 195         /* Request fences from host */
 196         mutex_lock(&dev_priv->drm.struct_mutex);
 197
 198         for (i = 0; i < vgpu_fence_sz(vgpu); i++) {
 199                 reg = i915_reserve_fence(dev_priv);
 200                 if (IS_ERR(reg))
 201                         goto out_free_fence;
 202
 203                 vgpu->fence.regs[i] = reg;
 204         }
 205
 206         _clear_vgpu_fence(vgpu);
 207
 208         mutex_unlock(&dev_priv->drm.struct_mutex);
 209         intel_runtime_pm_put(dev_priv);
 210         return 0;
 211 out_free_fence:
 212         gvt_vgpu_err("Failed to alloc fences\n");
 213         /* Return fences to host, if fail */
 214         for (i = 0; i < vgpu_fence_sz(vgpu); i++) {
 215                 reg = vgpu->fence.regs[i];
 216                 if (!reg)
 217                         continue;
 218                 i915_unreserve_fence(reg);
 219                 vgpu->fence.regs[i] = NULL;
 220         }
 221         mutex_unlock(&dev_priv->drm.struct_mutex);
 222         intel_runtime_pm_put(dev_priv);
 223         return -ENOSPC;
 224 }
 225
 226 static void free_resource(struct intel_vgpu *vgpu)
 227 {
 228         struct intel_gvt *gvt = vgpu->gvt;
 229
 230         gvt->gm.vgpu_allocated_low_gm_size -= vgpu_aperture_sz(vgpu);
 231         gvt->gm.vgpu_allocated_high_gm_size -= vgpu_hidden_sz(vgpu);
 232         gvt->fence.vgpu_allocated_fence_num -= vgpu_fence_sz(vgpu);
 233 }
 234
 235 static int alloc_resource(struct intel_vgpu *vgpu,
 236                 struct intel_vgpu_creation_params *param)
 237 {
 238         struct intel_gvt *gvt = vgpu->gvt;
 239         unsigned long request, avail, max, taken;
 240         const char *item;
 241
 242         if (!param->low_gm_sz || !param->high_gm_sz || !param->fence_sz) {
 243                 gvt_vgpu_err("Invalid vGPU creation params\n");
 244                 return -EINVAL;
 245         }
 246
 247         item = "low GM space";
 248         max = gvt_aperture_sz(gvt) - HOST_LOW_GM_SIZE;
 249         taken = gvt->gm.vgpu_allocated_low_gm_size;
 250         avail = max - taken;
 251         request = MB_TO_BYTES(param->low_gm_sz);
 252
 253         if (request > avail)
 254                 goto no_enough_resource;
 255
 256         vgpu_aperture_sz(vgpu) = ALIGN(request, I915_GTT_PAGE_SIZE);
 257
 258         item = "high GM space";
 259         max = gvt_hidden_sz(gvt) - HOST_HIGH_GM_SIZE;
 260         taken = gvt->gm.vgpu_allocated_high_gm_size;
 261         avail = max - taken;
 262         request = MB_TO_BYTES(param->high_gm_sz);
 263
 264         if (request > avail)
 265                 goto no_enough_resource;
 266
 267         vgpu_hidden_sz(vgpu) = ALIGN(request, I915_GTT_PAGE_SIZE);
 268
 269         item = "fence";
 270         max = gvt_fence_sz(gvt) - HOST_FENCE;
 271         taken = gvt->fence.vgpu_allocated_fence_num;
 272         avail = max - taken;
 273         request = param->fence_sz;
 274
 275         if (request > avail)
 276                 goto no_enough_resource;
 277
 278         vgpu_fence_sz(vgpu) = request;
 279
 280         gvt->gm.vgpu_allocated_low_gm_size += MB_TO_BYTES(param->low_gm_sz);
 281         gvt->gm.vgpu_allocated_high_gm_size += MB_TO_BYTES(param->high_gm_sz);
 282         gvt->fence.vgpu_allocated_fence_num += param->fence_sz;
 283         return 0;
 284
 285 no_enough_resource:
 286         gvt_err("fail to allocate resource %s\n", item);
 287         gvt_err("request %luMB avail %luMB max %luMB taken %luMB\n",
 288                 BYTES_TO_MB(request), BYTES_TO_MB(avail),
 289                 BYTES_TO_MB(max), BYTES_TO_MB(taken));
 290         return -ENOSPC;
 291 }
 292
 293 /**
 294  * inte_gvt_free_vgpu_resource - free HW resource owned by a vGPU
 295  * @vgpu: a vGPU
 296  *
 297  * This function is used to free the HW resource owned by a vGPU.
 298  *
 299  */
 300 void intel_vgpu_free_resource(struct intel_vgpu *vgpu)
 301 {
 302         free_vgpu_gm(vgpu);
 303         free_vgpu_fence(vgpu);
 304         free_resource(vgpu);
 305 }
 306
 307 /**
 308  * intel_vgpu_reset_resource - reset resource state owned by a vGPU
 309  * @vgpu: a vGPU
 310  *
 311  * This function is used to reset resource state owned by a vGPU.
 312  *
 313  */
 314 void intel_vgpu_reset_resource(struct intel_vgpu *vgpu)
 315 {
 316         struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 317
 318         intel_runtime_pm_get(dev_priv);
 319         _clear_vgpu_fence(vgpu);
 320         intel_runtime_pm_put(dev_priv);
 321 }
 322
 323 /**
 324  * intel_alloc_vgpu_resource - allocate HW resource for a vGPU
 325  * @vgpu: vGPU
 326  * @param: vGPU creation params
 327  *
 328  * This function is used to allocate HW resource for a vGPU. User specifies
 329  * the resource configuration through the creation params.
 330  *
 331  * Returns:
 332  * zero on success, negative error code if failed.
 333  *
 334  */
 335 int intel_vgpu_alloc_resource(struct intel_vgpu *vgpu,
 336                 struct intel_vgpu_creation_params *param)
 337 {
 338         int ret;
 339
 340         ret = alloc_resource(vgpu, param);
 341         if (ret)
 342                 return ret;
 343
 344         ret = alloc_vgpu_gm(vgpu);
 345         if (ret)
 346                 goto out_free_resource;
 347
 348         ret = alloc_vgpu_fence(vgpu);
 349         if (ret)
 350                 goto out_free_vgpu_gm;
 351
 352         return 0;
 353
 354 out_free_vgpu_gm:
 355         free_vgpu_gm(vgpu);
 356 out_free_resource:
 357         free_resource(vgpu);
 358         return ret;
 359 }