drivers/gpu/drm/i915/display/intel_plane_initial.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2021 Intel Corporation
   4  */
   5
   6 #include "gem/i915_gem_region.h"
   7 #include "i915_drv.h"
   8 #include "intel_atomic_plane.h"
   9 #include "intel_display.h"
  10 #include "intel_display_types.h"
  11 #include "intel_fb.h"
  12 #include "intel_plane_initial.h"
  13
  14 static bool
  15 intel_reuse_initial_plane_obj(struct drm_i915_private *i915,
  16                               const struct intel_initial_plane_config *plane_config,
  17                               struct drm_framebuffer **fb,
  18                               struct i915_vma **vma)
  19 {
  20         struct intel_crtc *crtc;
  21
  22         for_each_intel_crtc(&i915->drm, crtc) {
  23                 struct intel_crtc_state *crtc_state =
  24                         to_intel_crtc_state(crtc->base.state);
  25                 struct intel_plane *plane =
  26                         to_intel_plane(crtc->base.primary);
  27                 struct intel_plane_state *plane_state =
  28                         to_intel_plane_state(plane->base.state);
  29
  30                 if (!crtc_state->uapi.active)
  31                         continue;
  32
  33                 if (!plane_state->ggtt_vma)
  34                         continue;
  35
  36                 if (intel_plane_ggtt_offset(plane_state) == plane_config->base) {
  37                         *fb = plane_state->hw.fb;
  38                         *vma = plane_state->ggtt_vma;
  39                         return true;
  40                 }
  41         }
  42
  43         return false;
  44 }
  45
  46 static struct i915_vma *
  47 initial_plane_vma(struct drm_i915_private *i915,
  48                   struct intel_initial_plane_config *plane_config)
  49 {
  50         struct intel_memory_region *mem;
  51         struct drm_i915_gem_object *obj;
  52         struct i915_vma *vma;
  53         resource_size_t phys_base;
  54         u32 base, size;
  55         u64 pinctl;
  56
  57         if (plane_config->size == 0)
  58                 return NULL;
  59
  60         base = round_down(plane_config->base, I915_GTT_MIN_ALIGNMENT);
  61         if (IS_DGFX(i915)) {
  62                 gen8_pte_t __iomem *gte = to_gt(i915)->ggtt->gsm;
  63                 gen8_pte_t pte;
  64
  65                 gte += base / I915_GTT_PAGE_SIZE;
  66
  67                 pte = ioread64(gte);
  68                 if (!(pte & GEN12_GGTT_PTE_LM)) {
  69                         drm_err(&i915->drm,
  70                                 "Initial plane programming missing PTE_LM bit\n");
  71                         return NULL;
  72                 }
  73
  74                 phys_base = pte & I915_GTT_PAGE_MASK;
  75                 mem = i915->mm.regions[INTEL_REGION_LMEM_0];
  76
  77                 /*
  78                  * We don't currently expect this to ever be placed in the
  79                  * stolen portion.
  80                  */
  81                 if (phys_base >= resource_size(&mem->region)) {
  82                         drm_err(&i915->drm,
  83                                 "Initial plane programming using invalid range, phys_base=%pa\n",
  84                                 &phys_base);
  85                         return NULL;
  86                 }
  87
  88                 drm_dbg(&i915->drm,
  89                         "Using phys_base=%pa, based on initial plane programming\n",
  90                         &phys_base);
  91         } else {
  92                 phys_base = base;
  93                 mem = i915->mm.stolen_region;
  94         }
  95
  96         if (!mem)
  97                 return NULL;
  98
  99         size = round_up(plane_config->base + plane_config->size,
 100                         mem->min_page_size);
 101         size -= base;
 102
 103         /*
 104          * If the FB is too big, just don't use it since fbdev is not very
 105          * important and we should probably use that space with FBC or other
 106          * features.
 107          */
 108         if (IS_ENABLED(CONFIG_FRAMEBUFFER_CONSOLE) &&
 109             mem == i915->mm.stolen_region &&
 110             size * 2 > i915->stolen_usable_size)
 111                 return NULL;
 112
 113         obj = i915_gem_object_create_region_at(mem, phys_base, size,
 114                                                I915_BO_ALLOC_USER |
 115                                                I915_BO_PREALLOC);
 116         if (IS_ERR(obj))
 117                 return NULL;
 118
 119         /*
 120          * Mark it WT ahead of time to avoid changing the
 121          * cache_level during fbdev initialization. The
 122          * unbind there would get stuck waiting for rcu.
 123          */
 124         i915_gem_object_set_cache_coherency(obj, HAS_WT(i915) ?
 125                                             I915_CACHE_WT : I915_CACHE_NONE);
 126
 127         switch (plane_config->tiling) {
 128         case I915_TILING_NONE:
 129                 break;
 130         case I915_TILING_X:
 131         case I915_TILING_Y:
 132                 obj->tiling_and_stride =
 133                         plane_config->fb->base.pitches[0] |
 134                         plane_config->tiling;
 135                 break;
 136         default:
 137                 MISSING_CASE(plane_config->tiling);
 138                 goto err_obj;
 139         }
 140
 141         vma = i915_vma_instance(obj, &to_gt(i915)->ggtt->vm, NULL);
 142         if (IS_ERR(vma))
 143                 goto err_obj;
 144
 145         pinctl = PIN_GLOBAL | PIN_OFFSET_FIXED | base;
 146         if (HAS_GMCH(i915))
 147                 pinctl |= PIN_MAPPABLE;
 148         if (i915_vma_pin(vma, 0, 0, pinctl))
 149                 goto err_obj;
 150
 151         if (i915_gem_object_is_tiled(obj) &&
 152             !i915_vma_is_map_and_fenceable(vma))
 153                 goto err_obj;
 154
 155         return vma;
 156
 157 err_obj:
 158         i915_gem_object_put(obj);
 159         return NULL;
 160 }
 161
 162 static bool
 163 intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
 164                               struct intel_initial_plane_config *plane_config)
 165 {
 166         struct drm_device *dev = crtc->base.dev;
 167         struct drm_i915_private *dev_priv = to_i915(dev);
 168         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 169         struct drm_framebuffer *fb = &plane_config->fb->base;
 170         struct i915_vma *vma;
 171
 172         switch (fb->modifier) {
 173         case DRM_FORMAT_MOD_LINEAR:
 174         case I915_FORMAT_MOD_X_TILED:
 175         case I915_FORMAT_MOD_Y_TILED:
 176         case I915_FORMAT_MOD_4_TILED:
 177                 break;
 178         default:
 179                 drm_dbg(&dev_priv->drm,
 180                         "Unsupported modifier for initial FB: 0x%llx\n",
 181                         fb->modifier);
 182                 return false;
 183         }
 184
 185         vma = initial_plane_vma(dev_priv, plane_config);
 186         if (!vma)
 187                 return false;
 188
 189         mode_cmd.pixel_format = fb->format->format;
 190         mode_cmd.width = fb->width;
 191         mode_cmd.height = fb->height;
 192         mode_cmd.pitches[0] = fb->pitches[0];
 193         mode_cmd.modifier[0] = fb->modifier;
 194         mode_cmd.flags = DRM_MODE_FB_MODIFIERS;
 195
 196         if (intel_framebuffer_init(to_intel_framebuffer(fb),
 197                                    vma->obj, &mode_cmd)) {
 198                 drm_dbg_kms(&dev_priv->drm, "intel fb init failed\n");
 199                 goto err_vma;
 200         }
 201
 202         plane_config->vma = vma;
 203         return true;
 204
 205 err_vma:
 206         i915_vma_put(vma);
 207         return false;
 208 }
 209
 210 static void
 211 intel_find_initial_plane_obj(struct intel_crtc *crtc,
 212                              struct intel_initial_plane_config *plane_config)
 213 {
 214         struct drm_device *dev = crtc->base.dev;
 215         struct drm_i915_private *dev_priv = to_i915(dev);
 216         struct intel_plane *plane =
 217                 to_intel_plane(crtc->base.primary);
 218         struct intel_plane_state *plane_state =
 219                 to_intel_plane_state(plane->base.state);
 220         struct drm_framebuffer *fb;
 221         struct i915_vma *vma;
 222
 223         /*
 224          * TODO:
 225          *   Disable planes if get_initial_plane_config() failed.
 226          *   Make sure things work if the surface base is not page aligned.
 227          */
 228         if (!plane_config->fb)
 229                 return;
 230
 231         if (intel_alloc_initial_plane_obj(crtc, plane_config)) {
 232                 fb = &plane_config->fb->base;
 233                 vma = plane_config->vma;
 234                 goto valid_fb;
 235         }
 236
 237         /*
 238          * Failed to alloc the obj, check to see if we should share
 239          * an fb with another CRTC instead
 240          */
 241         if (intel_reuse_initial_plane_obj(dev_priv, plane_config, &fb, &vma))
 242                 goto valid_fb;
 243
 244         /*
 245          * We've failed to reconstruct the BIOS FB.  Current display state
 246          * indicates that the primary plane is visible, but has a NULL FB,
 247          * which will lead to problems later if we don't fix it up.  The
 248          * simplest solution is to just disable the primary plane now and
 249          * pretend the BIOS never had it enabled.
 250          */
 251         intel_plane_disable_noatomic(crtc, plane);
 252
 253         return;
 254
 255 valid_fb:
 256         plane_state->uapi.rotation = plane_config->rotation;
 257         intel_fb_fill_view(to_intel_framebuffer(fb),
 258                            plane_state->uapi.rotation, &plane_state->view);
 259
 260         __i915_vma_pin(vma);
 261         plane_state->ggtt_vma = i915_vma_get(vma);
 262         if (intel_plane_uses_fence(plane_state) &&
 263             i915_vma_pin_fence(vma) == 0 && vma->fence)
 264                 plane_state->flags |= PLANE_HAS_FENCE;
 265
 266         plane_state->uapi.src_x = 0;
 267         plane_state->uapi.src_y = 0;
 268         plane_state->uapi.src_w = fb->width << 16;
 269         plane_state->uapi.src_h = fb->height << 16;
 270
 271         plane_state->uapi.crtc_x = 0;
 272         plane_state->uapi.crtc_y = 0;
 273         plane_state->uapi.crtc_w = fb->width;
 274         plane_state->uapi.crtc_h = fb->height;
 275
 276         if (plane_config->tiling)
 277                 dev_priv->preserve_bios_swizzle = true;
 278
 279         plane_state->uapi.fb = fb;
 280         drm_framebuffer_get(fb);
 281
 282         plane_state->uapi.crtc = &crtc->base;
 283         intel_plane_copy_uapi_to_hw_state(plane_state, plane_state, crtc);
 284
 285         atomic_or(plane->frontbuffer_bit, &to_intel_frontbuffer(fb)->bits);
 286 }
 287
 288 static void plane_config_fini(struct intel_initial_plane_config *plane_config)
 289 {
 290         if (plane_config->fb) {
 291                 struct drm_framebuffer *fb = &plane_config->fb->base;
 292
 293                 /* We may only have the stub and not a full framebuffer */
 294                 if (drm_framebuffer_read_refcount(fb))
 295                         drm_framebuffer_put(fb);
 296                 else
 297                         kfree(fb);
 298         }
 299
 300         if (plane_config->vma)
 301                 i915_vma_put(plane_config->vma);
 302 }
 303
 304 void intel_crtc_initial_plane_config(struct intel_crtc *crtc)
 305 {
 306         struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 307         struct intel_initial_plane_config plane_config = {};
 308
 309         /*
 310          * Note that reserving the BIOS fb up front prevents us
 311          * from stuffing other stolen allocations like the ring
 312          * on top.  This prevents some ugliness at boot time, and
 313          * can even allow for smooth boot transitions if the BIOS
 314          * fb is large enough for the active pipe configuration.
 315          */
 316         dev_priv->display.funcs.display->get_initial_plane_config(crtc, &plane_config);
 317
 318         /*
 319          * If the fb is shared between multiple heads, we'll
 320          * just get the first one.
 321          */
 322         intel_find_initial_plane_obj(crtc, &plane_config);
 323
 324         plane_config_fini(&plane_config);
 325 }