Re: [PATCH 2/9] drm/i915/gtt: Use a common type for page directories

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Quoting Mika Kuoppala (2019-06-11 18:27:24)
> All page directories are identical in function, only the position in the
> hierarchy differ. Use same base type for directory functionality.
> 
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Cc: Matthew Auld <matthew.william.auld@xxxxxxxxx>
> Cc: Abdiel Janulgue <abdiel.janulgue@xxxxxxxxxxxxxxx>
> Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/gem/i915_gem_context.c |   2 +-
>  drivers/gpu/drm/i915/gt/intel_lrc_reg.h     |   2 +-
>  drivers/gpu/drm/i915/gt/intel_ringbuffer.c  |   2 +-
>  drivers/gpu/drm/i915/gvt/scheduler.c        |  30 +-
>  drivers/gpu/drm/i915/i915_gem_gtt.c         | 349 ++++++++++----------
>  drivers/gpu/drm/i915/i915_gem_gtt.h         |  64 ++--
>  6 files changed, 234 insertions(+), 215 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> index c86ca9f21532..dbab0ab1cef1 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> @@ -1038,7 +1038,7 @@ static int emit_ppgtt_update(struct i915_request *rq, void *data)
>  
>         if (i915_vm_is_4lvl(vm)) {
>                 struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
> -               const dma_addr_t pd_daddr = px_dma(&ppgtt->pml4);
> +               const dma_addr_t pd_daddr = px_dma(ppgtt->pd);
>  
>                 cs = intel_ring_begin(rq, 6);
>                 if (IS_ERR(cs))
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc_reg.h b/drivers/gpu/drm/i915/gt/intel_lrc_reg.h
> index 5ef932d810a7..6bf34738b4e5 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc_reg.h
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc_reg.h
> @@ -55,7 +55,7 @@
>  
>  #define ASSIGN_CTX_PML4(ppgtt, reg_state) do { \
>         u32 *reg_state__ = (reg_state); \
> -       const u64 addr__ = px_dma(&ppgtt->pml4); \
> +       const u64 addr__ = px_dma(ppgtt->pd); \
>         (reg_state__)[CTX_PDP0_UDW + 1] = upper_32_bits(addr__); \
>         (reg_state__)[CTX_PDP0_LDW + 1] = lower_32_bits(addr__); \
>  } while (0)
> diff --git a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
> index c834d016c965..3b857994943c 100644
> --- a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
> @@ -1523,7 +1523,7 @@ static int load_pd_dir(struct i915_request *rq, const struct i915_ppgtt *ppgtt)
>  
>         *cs++ = MI_LOAD_REGISTER_IMM(1);
>         *cs++ = i915_mmio_reg_offset(RING_PP_DIR_BASE(engine->mmio_base));
> -       *cs++ = ppgtt->pd.base.ggtt_offset << 10;
> +       *cs++ = ppgtt->pd->base.ggtt_offset << 10;
>  
>         intel_ring_advance(rq, cs);
>  
> diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c
> index e301efb18d45..f1e1261ac3db 100644
> --- a/drivers/gpu/drm/i915/gvt/scheduler.c
> +++ b/drivers/gpu/drm/i915/gvt/scheduler.c
> @@ -375,11 +375,13 @@ static int set_context_ppgtt_from_shadow(struct intel_vgpu_workload *workload,
>                 return -EINVAL;
>  
>         if (mm->ppgtt_mm.root_entry_type == GTT_TYPE_PPGTT_ROOT_L4_ENTRY) {
> -               px_dma(&ppgtt->pml4) = mm->ppgtt_mm.shadow_pdps[0];
> +               px_dma(ppgtt->pd) = mm->ppgtt_mm.shadow_pdps[0];
>         } else {
>                 for (i = 0; i < GVT_RING_CTX_NR_PDPS; i++) {
> -                       px_dma(ppgtt->pdp.page_directory[i]) =
> -                               mm->ppgtt_mm.shadow_pdps[i];
> +                       struct i915_page_directory * const pd =
> +                               i915_pd_entry(ppgtt->pd, i);
> +
> +                       px_dma(pd) = mm->ppgtt_mm.shadow_pdps[i];
>                 }
>         }
>  
> @@ -1128,11 +1130,14 @@ i915_context_ppgtt_root_restore(struct intel_vgpu_submission *s,
>         int i;
>  
>         if (i915_vm_is_4lvl(&ppgtt->vm)) {
> -               px_dma(&ppgtt->pml4) = s->i915_context_pml4;
> +               px_dma(ppgtt->pd) = s->i915_context_pml4;
>         } else {
> -               for (i = 0; i < GEN8_3LVL_PDPES; i++)
> -                       px_dma(ppgtt->pdp.page_directory[i]) =
> -                               s->i915_context_pdps[i];
> +               for (i = 0; i < GEN8_3LVL_PDPES; i++) {
> +                       struct i915_page_directory * const pd =
> +                               i915_pd_entry(ppgtt->pd, i);
> +
> +                       px_dma(pd) = s->i915_context_pdps[i];
> +               }
>         }
>  }
>  
> @@ -1186,11 +1191,14 @@ i915_context_ppgtt_root_save(struct intel_vgpu_submission *s,
>         int i;
>  
>         if (i915_vm_is_4lvl(&ppgtt->vm)) {
> -               s->i915_context_pml4 = px_dma(&ppgtt->pml4);
> +               s->i915_context_pml4 = px_dma(ppgtt->pd);
>         } else {
> -               for (i = 0; i < GEN8_3LVL_PDPES; i++)
> -                       s->i915_context_pdps[i] =
> -                               px_dma(ppgtt->pdp.page_directory[i]);
> +               for (i = 0; i < GEN8_3LVL_PDPES; i++) {
> +                       struct i915_page_directory * const pd =
> +                               i915_pd_entry(ppgtt->pd, i);
> +
> +                       s->i915_context_pdps[i] = px_dma(pd);
> +               }
>         }
>  }
>  
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 07f86d474fa2..9a1f956a817a 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -661,7 +661,8 @@ static struct i915_page_table *alloc_pt(struct i915_address_space *vm)
>                 return ERR_PTR(-ENOMEM);
>         }
>  
> -       atomic_set(&pt->used_ptes, 0);
> +       atomic_set(&pt->used, 0);
> +
>         return pt;
>  }
>  
> @@ -683,11 +684,28 @@ static void gen6_initialize_pt(struct i915_address_space *vm,
>         fill32_px(vm, pt, vm->scratch_pte);
>  }
>  
> +static struct i915_page_directory *__alloc_pd(const unsigned int entries)
> +{
> +       struct i915_page_directory *pd;
> +
> +       pd = kmalloc(sizeof(*pd) +
> +                    entries * sizeof(pd->entry[0]), I915_GFP_ALLOW_FAIL);
> +
> +       if (unlikely(!pd))
> +               return NULL;
> +
> +       memset(&pd->base, 0, sizeof(pd->base));
> +       atomic_set(&pd->used, 0);
> +       spin_lock_init(&pd->lock);
> +
> +       return pd;
> +}
> +
>  static struct i915_page_directory *alloc_pd(struct i915_address_space *vm)
>  {
>         struct i915_page_directory *pd;
>  
> -       pd = kmalloc(sizeof(*pd), I915_GFP_ALLOW_FAIL);
> +       pd = __alloc_pd(512);
>         if (unlikely(!pd))
>                 return ERR_PTR(-ENOMEM);
>  
> @@ -696,8 +714,6 @@ static struct i915_page_directory *alloc_pd(struct i915_address_space *vm)
>                 return ERR_PTR(-ENOMEM);
>         }
>  
> -       atomic_set(&pd->used_pdes, 0);
> -       spin_lock_init(&pd->lock);
>         return pd;
>  }
>  
> @@ -713,88 +729,56 @@ static void gen8_initialize_pd(struct i915_address_space *vm,
>  {
>         fill_px(vm, pd,
>                 gen8_pde_encode(px_dma(vm->scratch_pt), I915_CACHE_LLC));
> -       memset_p((void **)pd->page_table, vm->scratch_pt, I915_PDES);
> +       memset_p(pd->entry, vm->scratch_pt, I915_PDES);
>  }
>  
> -static int __pdp_init(struct i915_address_space *vm,
> -                     struct i915_page_directory_pointer *pdp)
> +static struct i915_page_directory *alloc_pdp(struct i915_address_space *vm)
>  {
> -       const unsigned int pdpes = i915_pdpes_per_pdp(vm);
> +       struct i915_page_directory *pdp;
>  
> -       pdp->page_directory = kmalloc_array(pdpes, sizeof(*pdp->page_directory),
> -                                           I915_GFP_ALLOW_FAIL);
> -       if (unlikely(!pdp->page_directory))
> -               return -ENOMEM;
> -
> -       memset_p((void **)pdp->page_directory, vm->scratch_pd, pdpes);
> -
> -       atomic_set(&pdp->used_pdpes, 0);
> -       spin_lock_init(&pdp->lock);
> -       return 0;
> -}
> -
> -static void __pdp_fini(struct i915_page_directory_pointer *pdp)
> -{
> -       kfree(pdp->page_directory);
> -       pdp->page_directory = NULL;
> -}
> -
> -static struct i915_page_directory_pointer *
> -alloc_pdp(struct i915_address_space *vm)
> -{
> -       struct i915_page_directory_pointer *pdp;
> -       int ret = -ENOMEM;
> -
> -       GEM_BUG_ON(!i915_vm_is_4lvl(vm));
> -
> -       pdp = kmalloc(sizeof(*pdp), GFP_KERNEL);
> +       pdp = __alloc_pd(i915_pdpes_per_pdp(vm));
>         if (!pdp)
>                 return ERR_PTR(-ENOMEM);
>  
> -       ret = __pdp_init(vm, pdp);
> -       if (ret)
> -               goto fail_bitmap;
> -
> -       ret = setup_px(vm, pdp);
> -       if (ret)
> -               goto fail_page_m;
> +       if (i915_vm_is_4lvl(vm)) {
> +               if (unlikely(setup_px(vm, pdp))) {
> +                       kfree(pdp);
> +                       return ERR_PTR(-ENOMEM);
> +               }
> +       }
>  
>         return pdp;
> -
> -fail_page_m:
> -       __pdp_fini(pdp);
> -fail_bitmap:
> -       kfree(pdp);
> -
> -       return ERR_PTR(ret);
>  }
>  
>  static void free_pdp(struct i915_address_space *vm,
> -                    struct i915_page_directory_pointer *pdp)
> +                    struct i915_page_directory *pdp)
>  {
> -       __pdp_fini(pdp);
> -
> -       if (!i915_vm_is_4lvl(vm))
> -               return;
> +       if (i915_vm_is_4lvl(vm))
> +               cleanup_px(vm, pdp);
>  
> -       cleanup_px(vm, pdp);
>         kfree(pdp);
>  }
>  
> -static void gen8_initialize_pdp(struct i915_address_space *vm,
> -                               struct i915_page_directory_pointer *pdp)
> +static void gen8_initialize_4lvl_pdp(struct i915_address_space *vm,
> +                                    struct i915_page_directory *pdp)
>  {
>         fill_px(vm, pdp,
>                 gen8_pdpe_encode(px_dma(vm->scratch_pd), I915_CACHE_LLC));
> +       memset_p(pdp->entry, vm->scratch_pd, 512);
> +}
> +
> +static void gen8_initialize_3lvl_pdp(struct i915_address_space *vm,
> +                                    struct i915_page_directory *pdp)
> +{
> +       memset_p(pdp->entry, vm->scratch_pd, GEN8_3LVL_PDPES);
>  }
>  
>  static void gen8_initialize_pml4(struct i915_address_space *vm,
> -                                struct i915_pml4 *pml4)
> +                                struct i915_page_directory *pml4)
>  {
>         fill_px(vm, pml4,
>                 gen8_pml4e_encode(px_dma(vm->scratch_pdp), I915_CACHE_LLC));
> -       memset_p((void **)pml4->pdps, vm->scratch_pdp, GEN8_PML4ES_PER_PML4);
> -       spin_lock_init(&pml4->lock);
> +       memset_p(pml4->entry, vm->scratch_pdp, GEN8_PML4ES_PER_PML4);
>  }
>  
>  /*
> @@ -822,8 +806,8 @@ static bool gen8_ppgtt_clear_pt(const struct i915_address_space *vm,
>         memset64(vaddr + gen8_pte_index(start), vm->scratch_pte, num_entries);
>         kunmap_atomic(vaddr);
>  
> -       GEM_BUG_ON(num_entries > atomic_read(&pt->used_ptes));
> -       return !atomic_sub_return(num_entries, &pt->used_ptes);
> +       GEM_BUG_ON(num_entries > atomic_read(&pt->used));
> +       return !atomic_sub_return(num_entries, &pt->used);
>  }
>  
>  static void gen8_ppgtt_set_pde(struct i915_address_space *vm,
> @@ -854,12 +838,12 @@ static bool gen8_ppgtt_clear_pd(struct i915_address_space *vm,
>                         continue;
>  
>                 spin_lock(&pd->lock);
> -               if (!atomic_read(&pt->used_ptes)) {
> +               if (!atomic_read(&pt->used)) {
>                         gen8_ppgtt_set_pde(vm, pd, vm->scratch_pt, pde);
> -                       pd->page_table[pde] = vm->scratch_pt;
> +                       pd->entry[pde] = vm->scratch_pt;
>  
> -                       GEM_BUG_ON(!atomic_read(&pd->used_pdes));
> -                       atomic_dec(&pd->used_pdes);
> +                       GEM_BUG_ON(!atomic_read(&pd->used));
> +                       atomic_dec(&pd->used);
>                         free = true;
>                 }
>                 spin_unlock(&pd->lock);
> @@ -867,11 +851,11 @@ static bool gen8_ppgtt_clear_pd(struct i915_address_space *vm,
>                         free_pt(vm, pt);
>         }
>  
> -       return !atomic_read(&pd->used_pdes);
> +       return !atomic_read(&pd->used);
>  }
>  
>  static void gen8_ppgtt_set_pdpe(struct i915_address_space *vm,
> -                               struct i915_page_directory_pointer *pdp,
> +                               struct i915_page_directory *pdp,
>                                 struct i915_page_directory *pd,
>                                 unsigned int pdpe)
>  {
> @@ -889,7 +873,7 @@ static void gen8_ppgtt_set_pdpe(struct i915_address_space *vm,
>   * Caller can use the return value to update higher-level entries
>   */
>  static bool gen8_ppgtt_clear_pdp(struct i915_address_space *vm,
> -                                struct i915_page_directory_pointer *pdp,
> +                                struct i915_page_directory * const pdp,
>                                  u64 start, u64 length)
>  {
>         struct i915_page_directory *pd;
> @@ -904,12 +888,12 @@ static bool gen8_ppgtt_clear_pdp(struct i915_address_space *vm,
>                         continue;
>  
>                 spin_lock(&pdp->lock);
> -               if (!atomic_read(&pd->used_pdes)) {
> +               if (!atomic_read(&pd->used)) {
>                         gen8_ppgtt_set_pdpe(vm, pdp, vm->scratch_pd, pdpe);
> -                       pdp->page_directory[pdpe] = vm->scratch_pd;
> +                       pdp->entry[pdpe] = vm->scratch_pd;
>  
> -                       GEM_BUG_ON(!atomic_read(&pdp->used_pdpes));
> -                       atomic_dec(&pdp->used_pdpes);
> +                       GEM_BUG_ON(!atomic_read(&pdp->used));
> +                       atomic_dec(&pdp->used);
>                         free = true;
>                 }
>                 spin_unlock(&pdp->lock);
> @@ -917,17 +901,17 @@ static bool gen8_ppgtt_clear_pdp(struct i915_address_space *vm,
>                         free_pd(vm, pd);
>         }
>  
> -       return !atomic_read(&pdp->used_pdpes);
> +       return !atomic_read(&pdp->used);
>  }
>  
>  static void gen8_ppgtt_clear_3lvl(struct i915_address_space *vm,
>                                   u64 start, u64 length)
>  {
> -       gen8_ppgtt_clear_pdp(vm, &i915_vm_to_ppgtt(vm)->pdp, start, length);
> +       gen8_ppgtt_clear_pdp(vm, i915_vm_to_ppgtt(vm)->pd, start, length);
>  }
>  
> -static void gen8_ppgtt_set_pml4e(struct i915_pml4 *pml4,
> -                                struct i915_page_directory_pointer *pdp,
> +static void gen8_ppgtt_set_pml4e(struct i915_page_directory *pml4,
> +                                struct i915_page_directory *pdp,
>                                  unsigned int pml4e)
>  {
>         gen8_ppgtt_pml4e_t *vaddr;
> @@ -945,8 +929,8 @@ static void gen8_ppgtt_clear_4lvl(struct i915_address_space *vm,
>                                   u64 start, u64 length)
>  {
>         struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
> -       struct i915_pml4 *pml4 = &ppgtt->pml4;
> -       struct i915_page_directory_pointer *pdp;
> +       struct i915_page_directory * const pml4 = ppgtt->pd;
> +       struct i915_page_directory *pdp;
>         unsigned int pml4e;
>  
>         GEM_BUG_ON(!i915_vm_is_4lvl(vm));
> @@ -959,9 +943,9 @@ static void gen8_ppgtt_clear_4lvl(struct i915_address_space *vm,
>                         continue;
>  
>                 spin_lock(&pml4->lock);
> -               if (!atomic_read(&pdp->used_pdpes)) {
> +               if (!atomic_read(&pdp->used)) {
>                         gen8_ppgtt_set_pml4e(pml4, vm->scratch_pdp, pml4e);
> -                       pml4->pdps[pml4e] = vm->scratch_pdp;
> +                       pml4->entry[pml4e] = vm->scratch_pdp;
>                         free = true;
>                 }
>                 spin_unlock(&pml4->lock);
> @@ -998,7 +982,7 @@ static __always_inline struct gen8_insert_pte gen8_insert_pte(u64 start)
>  
>  static __always_inline bool
>  gen8_ppgtt_insert_pte_entries(struct i915_ppgtt *ppgtt,
> -                             struct i915_page_directory_pointer *pdp,
> +                             struct i915_page_directory *pdp,
>                               struct sgt_dma *iter,
>                               struct gen8_insert_pte *idx,
>                               enum i915_cache_level cache_level,
> @@ -1010,8 +994,8 @@ gen8_ppgtt_insert_pte_entries(struct i915_ppgtt *ppgtt,
>         bool ret;
>  
>         GEM_BUG_ON(idx->pdpe >= i915_pdpes_per_pdp(&ppgtt->vm));
> -       pd = pdp->page_directory[idx->pdpe];
> -       vaddr = kmap_atomic_px(pd->page_table[idx->pde]);
> +       pd = i915_pd_entry(pdp, idx->pdpe);
> +       vaddr = kmap_atomic_px(i915_pt_entry(pd, idx->pde));
>         do {
>                 vaddr[idx->pte] = pte_encode | iter->dma;
>  
> @@ -1041,11 +1025,11 @@ gen8_ppgtt_insert_pte_entries(struct i915_ppgtt *ppgtt,
>                                 }
>  
>                                 GEM_BUG_ON(idx->pdpe >= i915_pdpes_per_pdp(&ppgtt->vm));
> -                               pd = pdp->page_directory[idx->pdpe];
> +                               pd = pdp->entry[idx->pdpe];
>                         }
>  
>                         kunmap_atomic(vaddr);
> -                       vaddr = kmap_atomic_px(pd->page_table[idx->pde]);
> +                       vaddr = kmap_atomic_px(i915_pt_entry(pd, idx->pde));
>                 }
>         } while (1);
>         kunmap_atomic(vaddr);
> @@ -1062,14 +1046,14 @@ static void gen8_ppgtt_insert_3lvl(struct i915_address_space *vm,
>         struct sgt_dma iter = sgt_dma(vma);
>         struct gen8_insert_pte idx = gen8_insert_pte(vma->node.start);
>  
> -       gen8_ppgtt_insert_pte_entries(ppgtt, &ppgtt->pdp, &iter, &idx,
> +       gen8_ppgtt_insert_pte_entries(ppgtt, ppgtt->pd, &iter, &idx,
>                                       cache_level, flags);
>  
>         vma->page_sizes.gtt = I915_GTT_PAGE_SIZE;
>  }
>  
>  static void gen8_ppgtt_insert_huge_entries(struct i915_vma *vma,
> -                                          struct i915_page_directory_pointer **pdps,
> +                                          struct i915_page_directory *pml4,
>                                            struct sgt_dma *iter,
>                                            enum i915_cache_level cache_level,
>                                            u32 flags)
> @@ -1080,8 +1064,9 @@ static void gen8_ppgtt_insert_huge_entries(struct i915_vma *vma,
>  
>         do {
>                 struct gen8_insert_pte idx = gen8_insert_pte(start);
> -               struct i915_page_directory_pointer *pdp = pdps[idx.pml4e];
> -               struct i915_page_directory *pd = pdp->page_directory[idx.pdpe];
> +               struct i915_page_directory *pdp =
> +                       i915_pdp_entry(pml4, idx.pml4e);
> +               struct i915_page_directory *pd = i915_pd_entry(pdp, idx.pdpe);
>                 unsigned int page_size;
>                 bool maybe_64K = false;
>                 gen8_pte_t encode = pte_encode;
> @@ -1099,7 +1084,7 @@ static void gen8_ppgtt_insert_huge_entries(struct i915_vma *vma,
>  
>                         vaddr = kmap_atomic_px(pd);
>                 } else {
> -                       struct i915_page_table *pt = pd->page_table[idx.pde];
> +                       struct i915_page_table *pt = i915_pt_entry(pd, idx.pde);
>  
>                         index = idx.pte;
>                         max = GEN8_PTES;
> @@ -1174,7 +1159,8 @@ static void gen8_ppgtt_insert_huge_entries(struct i915_vma *vma,
>                                 u16 i;
>  
>                                 encode = vma->vm->scratch_pte;
> -                               vaddr = kmap_atomic_px(pd->page_table[idx.pde]);
> +                               vaddr = kmap_atomic_px(i915_pt_entry(pd,
> +                                                                    idx.pde));
>  
>                                 for (i = 1; i < index; i += 16)
>                                         memset64(vaddr + i, encode, 15);
> @@ -1194,15 +1180,16 @@ static void gen8_ppgtt_insert_4lvl(struct i915_address_space *vm,
>  {
>         struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
>         struct sgt_dma iter = sgt_dma(vma);
> -       struct i915_page_directory_pointer **pdps = ppgtt->pml4.pdps;
> +       struct i915_page_directory * const pml4 = ppgtt->pd;
>  
>         if (vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
> -               gen8_ppgtt_insert_huge_entries(vma, pdps, &iter, cache_level,
> +               gen8_ppgtt_insert_huge_entries(vma, pml4, &iter, cache_level,
>                                                flags);
>         } else {
>                 struct gen8_insert_pte idx = gen8_insert_pte(vma->node.start);
>  
> -               while (gen8_ppgtt_insert_pte_entries(ppgtt, pdps[idx.pml4e++],
> +               while (gen8_ppgtt_insert_pte_entries(ppgtt,
> +                                                    i915_pdp_entry(pml4, idx.pml4e++),
>                                                      &iter, &idx, cache_level,
>                                                      flags))
>                         GEM_BUG_ON(idx.pml4e >= GEN8_PML4ES_PER_PML4);
> @@ -1217,8 +1204,8 @@ static void gen8_free_page_tables(struct i915_address_space *vm,
>         int i;
>  
>         for (i = 0; i < I915_PDES; i++) {
> -               if (pd->page_table[i] != vm->scratch_pt)
> -                       free_pt(vm, pd->page_table[i]);
> +               if (pd->entry[i] != vm->scratch_pt)
> +                       free_pt(vm, pd->entry[i]);
>         }
>  }
>  
> @@ -1277,7 +1264,7 @@ static int gen8_init_scratch(struct i915_address_space *vm)
>         gen8_initialize_pt(vm, vm->scratch_pt);
>         gen8_initialize_pd(vm, vm->scratch_pd);
>         if (i915_vm_is_4lvl(vm))
> -               gen8_initialize_pdp(vm, vm->scratch_pdp);
> +               gen8_initialize_4lvl_pdp(vm, vm->scratch_pdp);
>  
>         return 0;
>  
> @@ -1299,7 +1286,7 @@ static int gen8_ppgtt_notify_vgt(struct i915_ppgtt *ppgtt, bool create)
>         int i;
>  
>         if (i915_vm_is_4lvl(vm)) {
> -               const u64 daddr = px_dma(&ppgtt->pml4);
> +               const u64 daddr = px_dma(ppgtt->pd);
>  
>                 I915_WRITE(vgtif_reg(pdp[0].lo), lower_32_bits(daddr));
>                 I915_WRITE(vgtif_reg(pdp[0].hi), upper_32_bits(daddr));
> @@ -1336,17 +1323,17 @@ static void gen8_free_scratch(struct i915_address_space *vm)
>  }
>  
>  static void gen8_ppgtt_cleanup_3lvl(struct i915_address_space *vm,
> -                                   struct i915_page_directory_pointer *pdp)
> +                                   struct i915_page_directory *pdp)
>  {
>         const unsigned int pdpes = i915_pdpes_per_pdp(vm);
>         int i;
>  
>         for (i = 0; i < pdpes; i++) {
> -               if (pdp->page_directory[i] == vm->scratch_pd)
> +               if (pdp->entry[i] == vm->scratch_pd)
>                         continue;
>  
> -               gen8_free_page_tables(vm, pdp->page_directory[i]);
> -               free_pd(vm, pdp->page_directory[i]);
> +               gen8_free_page_tables(vm, pdp->entry[i]);
> +               free_pd(vm, pdp->entry[i]);
>         }
>  
>         free_pdp(vm, pdp);
> @@ -1354,16 +1341,19 @@ static void gen8_ppgtt_cleanup_3lvl(struct i915_address_space *vm,
>  
>  static void gen8_ppgtt_cleanup_4lvl(struct i915_ppgtt *ppgtt)
>  {
> +       struct i915_page_directory * const pml4 = ppgtt->pd;
>         int i;
>  
>         for (i = 0; i < GEN8_PML4ES_PER_PML4; i++) {
> -               if (ppgtt->pml4.pdps[i] == ppgtt->vm.scratch_pdp)
> +               struct i915_page_directory *pdp = i915_pdp_entry(pml4, i);
> +
> +               if (pdp == ppgtt->vm.scratch_pdp)
>                         continue;
>  
> -               gen8_ppgtt_cleanup_3lvl(&ppgtt->vm, ppgtt->pml4.pdps[i]);
> +               gen8_ppgtt_cleanup_3lvl(&ppgtt->vm, pdp);
>         }
>  
> -       cleanup_px(&ppgtt->vm, &ppgtt->pml4);
> +       cleanup_px(&ppgtt->vm, pml4);
>  }
>  
>  static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
> @@ -1377,7 +1367,7 @@ static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
>         if (i915_vm_is_4lvl(vm))
>                 gen8_ppgtt_cleanup_4lvl(ppgtt);
>         else
> -               gen8_ppgtt_cleanup_3lvl(&ppgtt->vm, &ppgtt->pdp);
> +               gen8_ppgtt_cleanup_3lvl(&ppgtt->vm, ppgtt->pd);
>  
>         gen8_free_scratch(vm);
>  }
> @@ -1406,10 +1396,10 @@ static int gen8_ppgtt_alloc_pd(struct i915_address_space *vm,
>                         if (count < GEN8_PTES || intel_vgpu_active(vm->i915))
>                                 gen8_initialize_pt(vm, pt);
>  
> -                       old = cmpxchg(&pd->page_table[pde], vm->scratch_pt, pt);
> +                       old = cmpxchg(&pd->entry[pde], vm->scratch_pt, pt);
>                         if (old == vm->scratch_pt) {
>                                 gen8_ppgtt_set_pde(vm, pd, pt, pde);
> -                               atomic_inc(&pd->used_pdes);
> +                               atomic_inc(&pd->used);
>                         } else {
>                                 free_pt(vm, pt);
>                                 pt = old;
> @@ -1418,7 +1408,7 @@ static int gen8_ppgtt_alloc_pd(struct i915_address_space *vm,
>                         spin_lock(&pd->lock);
>                 }
>  
> -               atomic_add(count, &pt->used_ptes);
> +               atomic_add(count, &pt->used);
>         }
>         spin_unlock(&pd->lock);
>  
> @@ -1430,7 +1420,7 @@ static int gen8_ppgtt_alloc_pd(struct i915_address_space *vm,
>  }
>  
>  static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
> -                               struct i915_page_directory_pointer *pdp,
> +                               struct i915_page_directory *pdp,
>                                 u64 start, u64 length)
>  {
>         struct i915_page_directory *pd;
> @@ -1451,11 +1441,10 @@ static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
>  
>                         gen8_initialize_pd(vm, pd);
>  
> -                       old = cmpxchg(&pdp->page_directory[pdpe],
> -                                     vm->scratch_pd, pd);
> +                       old = cmpxchg(&pdp->entry[pdpe], vm->scratch_pd, pd);
>                         if (old == vm->scratch_pd) {
>                                 gen8_ppgtt_set_pdpe(vm, pdp, pd, pdpe);
> -                               atomic_inc(&pdp->used_pdpes);
> +                               atomic_inc(&pdp->used);
>                         } else {
>                                 free_pd(vm, pd);
>                                 pd = old;
> @@ -1463,7 +1452,7 @@ static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
>  
>                         spin_lock(&pdp->lock);
>                 }
> -               atomic_inc(&pd->used_pdes);
> +               atomic_inc(&pd->used);
>                 spin_unlock(&pdp->lock);
>  
>                 ret = gen8_ppgtt_alloc_pd(vm, pd, start, length);
> @@ -1471,7 +1460,7 @@ static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
>                         goto unwind_pd;
>  
>                 spin_lock(&pdp->lock);
> -               atomic_dec(&pd->used_pdes);
> +               atomic_dec(&pd->used);
>         }
>         spin_unlock(&pdp->lock);
>  
> @@ -1479,10 +1468,10 @@ static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
>  
>  unwind_pd:
>         spin_lock(&pdp->lock);
> -       if (atomic_dec_and_test(&pd->used_pdes)) {
> +       if (atomic_dec_and_test(&pd->used)) {
>                 gen8_ppgtt_set_pdpe(vm, pdp, vm->scratch_pd, pdpe);
> -               GEM_BUG_ON(!atomic_read(&pdp->used_pdpes));
> -               atomic_dec(&pdp->used_pdpes);
> +               GEM_BUG_ON(!atomic_read(&pdp->used));
> +               atomic_dec(&pdp->used);
>                 free_pd(vm, pd);
>         }
>         spin_unlock(&pdp->lock);
> @@ -1495,23 +1484,24 @@ static int gen8_ppgtt_alloc_3lvl(struct i915_address_space *vm,
>                                  u64 start, u64 length)
>  {
>         return gen8_ppgtt_alloc_pdp(vm,
> -                                   &i915_vm_to_ppgtt(vm)->pdp, start, length);
> +                                   i915_vm_to_ppgtt(vm)->pd, start, length);
>  }
>  
>  static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
>                                  u64 start, u64 length)
>  {
>         struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
> -       struct i915_pml4 *pml4 = &ppgtt->pml4;
> -       struct i915_page_directory_pointer *pdp;
> +       struct i915_page_directory * const pml4 = ppgtt->pd;
> +       struct i915_page_directory *pdp;
>         u64 from = start;
>         u32 pml4e;
>         int ret;
>  
>         spin_lock(&pml4->lock);
>         gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
> +
>                 if (pdp == vm->scratch_pdp) {
> -                       struct i915_page_directory_pointer *old;
> +                       struct i915_page_directory *old;
>  
>                         spin_unlock(&pml4->lock);
>  
> @@ -1519,9 +1509,9 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
>                         if (IS_ERR(pdp))
>                                 goto unwind;
>  
> -                       gen8_initialize_pdp(vm, pdp);
> +                       gen8_initialize_4lvl_pdp(vm, pdp);
>  
> -                       old = cmpxchg(&pml4->pdps[pml4e], vm->scratch_pdp, pdp);
> +                       old = cmpxchg(&pml4->entry[pml4e], vm->scratch_pdp, pdp);
>                         if (old == vm->scratch_pdp) {
>                                 gen8_ppgtt_set_pml4e(pml4, pdp, pml4e);
>                         } else {
> @@ -1531,7 +1521,7 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
>  
>                         spin_lock(&pml4->lock);
>                 }
> -               atomic_inc(&pdp->used_pdpes);
> +               atomic_inc(&pdp->used);
>                 spin_unlock(&pml4->lock);
>  
>                 ret = gen8_ppgtt_alloc_pdp(vm, pdp, start, length);
> @@ -1539,7 +1529,7 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
>                         goto unwind_pdp;
>  
>                 spin_lock(&pml4->lock);
> -               atomic_dec(&pdp->used_pdpes);
> +               atomic_dec(&pdp->used);
>         }
>         spin_unlock(&pml4->lock);
>  
> @@ -1547,7 +1537,7 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
>  
>  unwind_pdp:
>         spin_lock(&pml4->lock);
> -       if (atomic_dec_and_test(&pdp->used_pdpes)) {
> +       if (atomic_dec_and_test(&pdp->used)) {
>                 gen8_ppgtt_set_pml4e(pml4, vm->scratch_pdp, pml4e);
>                 free_pdp(vm, pdp);
>         }
> @@ -1560,7 +1550,7 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
>  static int gen8_preallocate_top_level_pdp(struct i915_ppgtt *ppgtt)
>  {
>         struct i915_address_space *vm = &ppgtt->vm;
> -       struct i915_page_directory_pointer *pdp = &ppgtt->pdp;
> +       struct i915_page_directory *pdp = ppgtt->pd;
>         struct i915_page_directory *pd;
>         u64 start = 0, length = ppgtt->vm.total;
>         u64 from = start;
> @@ -1573,10 +1563,12 @@ static int gen8_preallocate_top_level_pdp(struct i915_ppgtt *ppgtt)
>  
>                 gen8_initialize_pd(vm, pd);
>                 gen8_ppgtt_set_pdpe(vm, pdp, pd, pdpe);
> -               atomic_inc(&pdp->used_pdpes);
> +
> +               atomic_inc(&pdp->used);
>         }
>  
> -       atomic_inc(&pdp->used_pdpes); /* never remove */
> +       atomic_inc(&pdp->used); /* never remove */
> +
>         return 0;
>  
>  unwind:
> @@ -1585,7 +1577,7 @@ static int gen8_preallocate_top_level_pdp(struct i915_ppgtt *ppgtt)
>                 gen8_ppgtt_set_pdpe(vm, pdp, vm->scratch_pd, pdpe);
>                 free_pd(vm, pd);
>         }
> -       atomic_set(&pdp->used_pdpes, 0);
> +       atomic_set(&pdp->used, 0);
>         return -ENOMEM;
>  }
>  
> @@ -1640,27 +1632,25 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
>         if (err)
>                 goto err_free;
>  
> -       if (i915_vm_is_4lvl(&ppgtt->vm)) {
> -               err = setup_px(&ppgtt->vm, &ppgtt->pml4);
> -               if (err)
> -                       goto err_scratch;
> +       ppgtt->pd = alloc_pdp(&ppgtt->vm);
> +       if (IS_ERR(ppgtt->pd)) {
> +               err = PTR_ERR(ppgtt->pd);
> +               goto err_scratch;
> +       }
>  
> -               gen8_initialize_pml4(&ppgtt->vm, &ppgtt->pml4);
> +       if (i915_vm_is_4lvl(&ppgtt->vm)) {
> +               gen8_initialize_pml4(&ppgtt->vm, ppgtt->pd);
>  
>                 ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc_4lvl;
>                 ppgtt->vm.insert_entries = gen8_ppgtt_insert_4lvl;
>                 ppgtt->vm.clear_range = gen8_ppgtt_clear_4lvl;
>         } else {
> -               err = __pdp_init(&ppgtt->vm, &ppgtt->pdp);
> -               if (err)
> -                       goto err_scratch;
> +               gen8_initialize_3lvl_pdp(&ppgtt->vm, ppgtt->pd);
>  
>                 if (intel_vgpu_active(i915)) {
>                         err = gen8_preallocate_top_level_pdp(ppgtt);
> -                       if (err) {
> -                               __pdp_fini(&ppgtt->pdp);
> -                               goto err_scratch;
> -                       }
> +                       if (err)
> +                               goto err_pdp;
>                 }
>  
>                 ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc_3lvl;
> @@ -1675,6 +1665,8 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
>  
>         return ppgtt;
>  
> +err_pdp:
> +       free_pdp(&ppgtt->vm, ppgtt->pd);
>  err_scratch:
>         gen8_free_scratch(&ppgtt->vm);
>  err_free:
> @@ -1740,15 +1732,16 @@ static void gen6_ppgtt_enable(struct drm_i915_private *dev_priv)
>  static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
>                                    u64 start, u64 length)
>  {
> -       struct gen6_ppgtt *ppgtt = to_gen6_ppgtt(i915_vm_to_ppgtt(vm));
> -       unsigned int first_entry = start / I915_GTT_PAGE_SIZE;
> +       struct gen6_ppgtt * const ppgtt = to_gen6_ppgtt(i915_vm_to_ppgtt(vm));
> +       const unsigned int first_entry = start / I915_GTT_PAGE_SIZE;
> +       const gen6_pte_t scratch_pte = vm->scratch_pte;
>         unsigned int pde = first_entry / GEN6_PTES;
>         unsigned int pte = first_entry % GEN6_PTES;
>         unsigned int num_entries = length / I915_GTT_PAGE_SIZE;
> -       const gen6_pte_t scratch_pte = vm->scratch_pte;
>  
>         while (num_entries) {
> -               struct i915_page_table *pt = ppgtt->base.pd.page_table[pde++];
> +               struct i915_page_table * const pt =
> +                       i915_pt_entry(ppgtt->base.pd, pde++);
>                 const unsigned int count = min(num_entries, GEN6_PTES - pte);
>                 gen6_pte_t *vaddr;
>  
> @@ -1756,8 +1749,8 @@ static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
>  
>                 num_entries -= count;
>  
> -               GEM_BUG_ON(count > atomic_read(&pt->used_ptes));
> -               if (!atomic_sub_return(count, &pt->used_ptes))
> +               GEM_BUG_ON(count > atomic_read(&pt->used));
> +               if (!atomic_sub_return(count, &pt->used))
>                         ppgtt->scan_for_unused_pt = true;
>  
>                 /*
> @@ -1781,6 +1774,7 @@ static void gen6_ppgtt_insert_entries(struct i915_address_space *vm,
>                                       u32 flags)
>  {
>         struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
> +       struct i915_page_directory * const pd = ppgtt->pd;
>         unsigned first_entry = vma->node.start / I915_GTT_PAGE_SIZE;
>         unsigned act_pt = first_entry / GEN6_PTES;
>         unsigned act_pte = first_entry % GEN6_PTES;
> @@ -1788,9 +1782,9 @@ static void gen6_ppgtt_insert_entries(struct i915_address_space *vm,
>         struct sgt_dma iter = sgt_dma(vma);
>         gen6_pte_t *vaddr;
>  
> -       GEM_BUG_ON(ppgtt->pd.page_table[act_pt] == vm->scratch_pt);
> +       GEM_BUG_ON(i915_pt_entry(pd, act_pt) == vm->scratch_pt);
>  
> -       vaddr = kmap_atomic_px(ppgtt->pd.page_table[act_pt]);
> +       vaddr = kmap_atomic_px(i915_pt_entry(pd, act_pt));
>         do {
>                 vaddr[act_pte] = pte_encode | GEN6_PTE_ADDR_ENCODE(iter.dma);
>  
> @@ -1806,7 +1800,7 @@ static void gen6_ppgtt_insert_entries(struct i915_address_space *vm,
>  
>                 if (++act_pte == GEN6_PTES) {
>                         kunmap_atomic(vaddr);
> -                       vaddr = kmap_atomic_px(ppgtt->pd.page_table[++act_pt]);
> +                       vaddr = kmap_atomic_px(i915_pt_entry(pd, ++act_pt));
>                         act_pte = 0;
>                 }
>         } while (1);
> @@ -1819,6 +1813,7 @@ static int gen6_alloc_va_range(struct i915_address_space *vm,
>                                u64 start, u64 length)
>  {
>         struct gen6_ppgtt *ppgtt = to_gen6_ppgtt(i915_vm_to_ppgtt(vm));
> +       struct i915_page_directory * const pd = ppgtt->base.pd;
>         struct i915_page_table *pt;
>         intel_wakeref_t wakeref;
>         u64 from = start;
> @@ -1827,14 +1822,14 @@ static int gen6_alloc_va_range(struct i915_address_space *vm,
>  
>         wakeref = intel_runtime_pm_get(vm->i915);
>  
> -       spin_lock(&ppgtt->base.pd.lock);
> -       gen6_for_each_pde(pt, &ppgtt->base.pd, start, length, pde) {
> +       spin_lock(&pd->lock);
> +       gen6_for_each_pde(pt, pd, start, length, pde) {
>                 const unsigned int count = gen6_pte_count(start, length);
>  
>                 if (pt == vm->scratch_pt) {
>                         struct i915_page_table *old;
>  
> -                       spin_unlock(&ppgtt->base.pd.lock);
> +                       spin_unlock(&pd->lock);
>  
>                         pt = alloc_pt(vm);
>                         if (IS_ERR(pt))
> @@ -1842,10 +1837,8 @@ static int gen6_alloc_va_range(struct i915_address_space *vm,
>  
>                         gen6_initialize_pt(vm, pt);
>  
> -                       old = cmpxchg(&ppgtt->base.pd.page_table[pde],
> -                                     vm->scratch_pt, pt);
> +                       old = cmpxchg(&pd->entry[pde], vm->scratch_pt, pt);
>                         if (old == vm->scratch_pt) {
> -                               ppgtt->base.pd.page_table[pde] = pt;
>                                 if (i915_vma_is_bound(ppgtt->vma,
>                                                       I915_VMA_GLOBAL_BIND)) {
>                                         gen6_write_pde(ppgtt, pde, pt);
> @@ -1856,12 +1849,12 @@ static int gen6_alloc_va_range(struct i915_address_space *vm,
>                                 pt = old;
>                         }
>  
> -                       spin_lock(&ppgtt->base.pd.lock);
> +                       spin_lock(&pd->lock);
>                 }
>  
> -               atomic_add(count, &pt->used_ptes);
> +               atomic_add(count, &pt->used);
>         }
> -       spin_unlock(&ppgtt->base.pd.lock);
> +       spin_unlock(&pd->lock);
>  
>         if (flush) {
>                 mark_tlbs_dirty(&ppgtt->base);
> @@ -1881,6 +1874,7 @@ static int gen6_alloc_va_range(struct i915_address_space *vm,
>  static int gen6_ppgtt_init_scratch(struct gen6_ppgtt *ppgtt)
>  {
>         struct i915_address_space * const vm = &ppgtt->base.vm;
> +       struct i915_page_directory * const pd = ppgtt->base.pd;
>         struct i915_page_table *unused;
>         u32 pde;
>         int ret;
> @@ -1900,9 +1894,9 @@ static int gen6_ppgtt_init_scratch(struct gen6_ppgtt *ppgtt)
>         }
>  
>         gen6_initialize_pt(vm, vm->scratch_pt);
> -       gen6_for_all_pdes(unused, &ppgtt->base.pd, pde)
> -               ppgtt->base.pd.page_table[pde] = vm->scratch_pt;
> -       spin_lock_init(&ppgtt->base.pd.lock);
> +
> +       gen6_for_all_pdes(unused, pd, pde)
> +               pd->entry[pde] = vm->scratch_pt;
>  
>         return 0;
>  }
> @@ -1915,10 +1909,11 @@ static void gen6_ppgtt_free_scratch(struct i915_address_space *vm)
>  
>  static void gen6_ppgtt_free_pd(struct gen6_ppgtt *ppgtt)
>  {
> +       struct i915_page_directory * const pd = ppgtt->base.pd;
>         struct i915_page_table *pt;
>         u32 pde;
>  
> -       gen6_for_all_pdes(pt, &ppgtt->base.pd, pde)
> +       gen6_for_all_pdes(pt, pd, pde)
>                 if (pt != ppgtt->base.vm.scratch_pt)
>                         free_pt(&ppgtt->base.vm, pt);
>  }
> @@ -1982,6 +1977,7 @@ static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
>  
>         gen6_ppgtt_free_pd(ppgtt);
>         gen6_ppgtt_free_scratch(vm);
> +       kfree(ppgtt->base.pd);
>  }
>  
>  static int pd_vma_set_pages(struct i915_vma *vma)
> @@ -2007,10 +2003,10 @@ static int pd_vma_bind(struct i915_vma *vma,
>         struct i915_page_table *pt;
>         unsigned int pde;
>  
> -       ppgtt->base.pd.base.ggtt_offset = ggtt_offset * sizeof(gen6_pte_t);
> +       ppgtt->base.pd->base.ggtt_offset = ggtt_offset * sizeof(gen6_pte_t);
>         ppgtt->pd_addr = (gen6_pte_t __iomem *)ggtt->gsm + ggtt_offset;
>  
> -       gen6_for_all_pdes(pt, &ppgtt->base.pd, pde)
> +       gen6_for_all_pdes(pt, ppgtt->base.pd, pde)
>                 gen6_write_pde(ppgtt, pde, pt);
>  
>         mark_tlbs_dirty(&ppgtt->base);
> @@ -2022,6 +2018,7 @@ static int pd_vma_bind(struct i915_vma *vma,
>  static void pd_vma_unbind(struct i915_vma *vma)
>  {
>         struct gen6_ppgtt *ppgtt = vma->private;
> +       struct i915_page_directory * const pd = ppgtt->base.pd;
>         struct i915_page_table * const scratch_pt = ppgtt->base.vm.scratch_pt;
>         struct i915_page_table *pt;
>         unsigned int pde;
> @@ -2030,12 +2027,12 @@ static void pd_vma_unbind(struct i915_vma *vma)
>                 return;
>  
>         /* Free all no longer used page tables */
> -       gen6_for_all_pdes(pt, &ppgtt->base.pd, pde) {
> -               if (atomic_read(&pt->used_ptes) || pt == scratch_pt)
> +       gen6_for_all_pdes(pt, ppgtt->base.pd, pde) {
> +               if (atomic_read(&pt->used) || pt == scratch_pt)
>                         continue;
>  
>                 free_pt(&ppgtt->base.vm, pt);
> -               ppgtt->base.pd.page_table[pde] = scratch_pt;
> +               pd->entry[pde] = scratch_pt;
>         }
>  
>         ppgtt->scan_for_unused_pt = false;
> @@ -2164,9 +2161,15 @@ static struct i915_ppgtt *gen6_ppgtt_create(struct drm_i915_private *i915)
>                 goto err_free;
>         }
>  
> +       ppgtt->base.pd = __alloc_pd(512);
> +       if (!ppgtt->base.pd) {
> +               err = -ENOMEM;
> +               goto err_work;
> +       }
> +
>         err = gen6_ppgtt_init_scratch(ppgtt);
>         if (err)
> -               goto err_work;
> +               goto err_pd;
>  
>         ppgtt->vma = pd_vma_create(ppgtt, GEN6_PD_SIZE);
>         if (IS_ERR(ppgtt->vma)) {
> @@ -2178,6 +2181,8 @@ static struct i915_ppgtt *gen6_ppgtt_create(struct drm_i915_private *i915)
>  
>  err_scratch:
>         gen6_ppgtt_free_scratch(&ppgtt->base.vm);
> +err_pd:
> +       kfree(ppgtt->base.pd);
>  err_work:
>         kfree(ppgtt->work);
>  err_free:
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
> index 89437d0a721c..49f44071def4 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.h
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
> @@ -248,28 +248,14 @@ struct i915_page_dma {
>  
>  struct i915_page_table {
>         struct i915_page_dma base;
> -       atomic_t used_ptes;
> +       atomic_t used;
>  };
>  
>  struct i915_page_directory {
>         struct i915_page_dma base;
> -
> -       struct i915_page_table *page_table[I915_PDES]; /* PDEs */
> -       atomic_t used_pdes;
> -       spinlock_t lock;
> -};
> -
> -struct i915_page_directory_pointer {
> -       struct i915_page_dma base;
> -       struct i915_page_directory **page_directory;
> -       atomic_t used_pdpes;
> -       spinlock_t lock;
> -};
> -
> -struct i915_pml4 {
> -       struct i915_page_dma base;
> -       struct i915_page_directory_pointer *pdps[GEN8_PML4ES_PER_PML4];
> +       atomic_t used;
>         spinlock_t lock;
> +       void *entry[0];
>  };

Furthermore, we can say that only two types of pointer could be stored
here. However, unions tend to end up with messy code, so I can
understand if the implicit casts from void end up being neater.
-Chris
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