Re: [PATCH 3/5] drm/ttm: replace busy placement with flags v6

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On 1/17/24 11:47, Thomas Hellström wrote:
Hi, Christian

Xe changes look good. Will send the series to xe ci to check for regressions.

Hmm, there are some checkpatch warnings about author / SOB email mismatch,

But worserthere are some regressions in the dma-buf ktest (it tests evicting of a dynamic dma-buf),

https://patchwork.freedesktop.org/series/128873/

I'll take a look later today or tomorrow.

/Thomas




/Thomas


On 1/12/24 13:51, Christian König wrote:
From: Somalapuram Amaranath <Amaranath.Somalapuram@xxxxxxx>

Instead of a list of separate busy placement add flags which indicate
that a placement should only be used when there is room or if we need to
evict.

v2: add missing TTM_PL_FLAG_IDLE for i915
v3: fix auto build test ERROR on drm-tip/drm-tip
v4: fix some typos pointed out by checkpatch
v5: cleanup some rebase problems with VMWGFX
v6: implement some missing VMWGFX functionality pointed out by Zack,
     rename the flags as suggested by Michel, rebase on drm-tip and
     adjust XE as well

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Somalapuram Amaranath <Amaranath.Somalapuram@xxxxxxx>
---
  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c |  6 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    | 11 +---
  drivers/gpu/drm/drm_gem_vram_helper.c      |  2 -
  drivers/gpu/drm/i915/gem/i915_gem_ttm.c    | 37 +++++------
  drivers/gpu/drm/loongson/lsdc_ttm.c        |  2 -
  drivers/gpu/drm/nouveau/nouveau_bo.c       | 59 +++++++----------
  drivers/gpu/drm/nouveau/nouveau_bo.h       |  1 -
  drivers/gpu/drm/qxl/qxl_object.c           |  2 -
  drivers/gpu/drm/qxl/qxl_ttm.c              |  2 -
  drivers/gpu/drm/radeon/radeon_object.c     |  2 -
  drivers/gpu/drm/radeon/radeon_ttm.c        |  8 +--
  drivers/gpu/drm/radeon/radeon_uvd.c        |  1 -
  drivers/gpu/drm/ttm/ttm_bo.c               | 21 ++++---
  drivers/gpu/drm/ttm/ttm_resource.c         | 73 +++++-----------------
  drivers/gpu/drm/vmwgfx/vmwgfx_bo.c         | 33 +++++++---
  drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c |  4 --
  drivers/gpu/drm/xe/xe_bo.c                 | 33 +++++-----
  include/drm/ttm/ttm_placement.h            | 10 +--
  include/drm/ttm/ttm_resource.h             |  8 +--
  19 files changed, 118 insertions(+), 197 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 425cebcc5cbf..b671b0665492 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -220,9 +220,6 @@ void amdgpu_bo_placement_from_domain(struct amdgpu_bo *abo, u32 domain)
        placement->num_placement = c;
      placement->placement = places;
-
-    placement->num_busy_placement = c;
-    placement->busy_placement = places;
  }
    /**
@@ -1397,8 +1394,7 @@ vm_fault_t amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
                      AMDGPU_GEM_DOMAIN_GTT);
        /* Avoid costly evictions; only set GTT as a busy placement */
-    abo->placement.num_busy_placement = 1;
-    abo->placement.busy_placement = &abo->placements[1];
+    abo->placements[0].flags |= TTM_PL_FLAG_DESIRED;
        r = ttm_bo_validate(bo, &abo->placement, &ctx);
      if (unlikely(r == -EBUSY || r == -ERESTARTSYS))
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 75c9fd2c6c2a..8722beba494e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -102,23 +102,19 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
      /* Don't handle scatter gather BOs */
      if (bo->type == ttm_bo_type_sg) {
          placement->num_placement = 0;
-        placement->num_busy_placement = 0;
          return;
      }
        /* Object isn't an AMDGPU object so ignore */
      if (!amdgpu_bo_is_amdgpu_bo(bo)) {
          placement->placement = &placements;
-        placement->busy_placement = &placements;
          placement->num_placement = 1;
-        placement->num_busy_placement = 1;
          return;
      }
        abo = ttm_to_amdgpu_bo(bo);
      if (abo->flags & AMDGPU_GEM_CREATE_DISCARDABLE) {
          placement->num_placement = 0;
-        placement->num_busy_placement = 0;
          return;
      }
  @@ -128,13 +124,13 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
      case AMDGPU_PL_OA:
      case AMDGPU_PL_DOORBELL:
          placement->num_placement = 0;
-        placement->num_busy_placement = 0;
          return;
        case TTM_PL_VRAM:
          if (!adev->mman.buffer_funcs_enabled) {
              /* Move to system memory */
              amdgpu_bo_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_CPU);
+
          } else if (!amdgpu_gmc_vram_full_visible(&adev->gmc) &&
                 !(abo->flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED) &&
                 amdgpu_bo_in_cpu_visible_vram(abo)) {
@@ -149,8 +145,7 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
                              AMDGPU_GEM_DOMAIN_CPU);
              abo->placements[0].fpfn = adev->gmc.visible_vram_size >> PAGE_SHIFT;
              abo->placements[0].lpfn = 0;
-            abo->placement.busy_placement = &abo->placements[1];
-            abo->placement.num_busy_placement = 1;
+            abo->placements[0].flags |= TTM_PL_FLAG_DESIRED;
          } else {
              /* Move to GTT memory */
              amdgpu_bo_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_GTT | @@ -966,8 +961,6 @@ int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
      /* allocate GART space */
      placement.num_placement = 1;
      placement.placement = &placements;
-    placement.num_busy_placement = 1;
-    placement.busy_placement = &placements;
      placements.fpfn = 0;
      placements.lpfn = adev->gmc.gart_size >> PAGE_SHIFT;
      placements.mem_type = TTM_PL_TT;
diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
index b67eafa55715..75f2eaf0d5b6 100644
--- a/drivers/gpu/drm/drm_gem_vram_helper.c
+++ b/drivers/gpu/drm/drm_gem_vram_helper.c
@@ -147,7 +147,6 @@ static void drm_gem_vram_placement(struct drm_gem_vram_object *gbo,
          invariant_flags = TTM_PL_FLAG_TOPDOWN;
        gbo->placement.placement = gbo->placements;
-    gbo->placement.busy_placement = gbo->placements;
        if (pl_flag & DRM_GEM_VRAM_PL_FLAG_VRAM) {
          gbo->placements[c].mem_type = TTM_PL_VRAM;
@@ -160,7 +159,6 @@ static void drm_gem_vram_placement(struct drm_gem_vram_object *gbo,
      }
        gbo->placement.num_placement = c;
-    gbo->placement.num_busy_placement = c;
        for (i = 0; i < c; ++i) {
          gbo->placements[i].fpfn = 0;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 6b69ef0cdbb4..80c6cafc8887 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -65,8 +65,6 @@ static const struct ttm_place sys_placement_flags = {
  static struct ttm_placement i915_sys_placement = {
      .num_placement = 1,
      .placement = &sys_placement_flags,
-    .num_busy_placement = 1,
-    .busy_placement = &sys_placement_flags,
  };
    /**
@@ -157,32 +155,28 @@ i915_ttm_place_from_region(const struct intel_memory_region *mr,
    static void
  i915_ttm_placement_from_obj(const struct drm_i915_gem_object *obj,
-                struct ttm_place *requested,
-                struct ttm_place *busy,
+                struct ttm_place *places,
                  struct ttm_placement *placement)
  {
      unsigned int num_allowed = obj->mm.n_placements;
      unsigned int flags = obj->flags;
      unsigned int i;
  -    placement->num_placement = 1;
+    places[0].flags |= TTM_PL_FLAG_DESIRED;
      i915_ttm_place_from_region(num_allowed ? obj->mm.placements[0] :
-                   obj->mm.region, requested, obj->bo_offset,
+                   obj->mm.region, &places[0], obj->bo_offset,
                     obj->base.size, flags);
        /* Cache this on object? */
-    placement->num_busy_placement = num_allowed;
-    for (i = 0; i < placement->num_busy_placement; ++i)
-        i915_ttm_place_from_region(obj->mm.placements[i], busy + i,
-                       obj->bo_offset, obj->base.size, flags);
-
-    if (num_allowed == 0) {
-        *busy = *requested;
-        placement->num_busy_placement = 1;
+    for (i = 0; i < num_allowed; ++i) {
+        i915_ttm_place_from_region(obj->mm.placements[i],
+                       &places[i + 1], obj->bo_offset,
+                       obj->base.size, flags);
+        places[i + 1].flags |= TTM_PL_FLAG_FALLBACK;
      }
  -    placement->placement = requested;
-    placement->busy_placement = busy;
+    placement->num_placement = num_allowed + 1;
+    placement->placement = places;
  }
    static int i915_ttm_tt_shmem_populate(struct ttm_device *bdev,
@@ -789,7 +783,8 @@ static int __i915_ttm_get_pages(struct drm_i915_gem_object *obj,
      int ret;
        /* First try only the requested placement. No eviction. */
-    real_num_busy = fetch_and_zero(&placement->num_busy_placement);
+    real_num_busy = placement->num_placement;
+    placement->num_placement = 1;
      ret = ttm_bo_validate(bo, placement, &ctx);
      if (ret) {
          ret = i915_ttm_err_to_gem(ret);
@@ -805,7 +800,7 @@ static int __i915_ttm_get_pages(struct drm_i915_gem_object *obj,            * If the initial attempt fails, allow all accepted placements,
           * evicting if necessary.
           */
-        placement->num_busy_placement = real_num_busy;
+        placement->num_placement = real_num_busy;
          ret = ttm_bo_validate(bo, placement, &ctx);
          if (ret)
              return i915_ttm_err_to_gem(ret);
@@ -839,7 +834,7 @@ static int __i915_ttm_get_pages(struct drm_i915_gem_object *obj,
    static int i915_ttm_get_pages(struct drm_i915_gem_object *obj)
  {
-    struct ttm_place requested, busy[I915_TTM_MAX_PLACEMENTS];
+    struct ttm_place places[I915_TTM_MAX_PLACEMENTS + 1];
      struct ttm_placement placement;
        /* restricted by sg_alloc_table */
@@ -849,7 +844,7 @@ static int i915_ttm_get_pages(struct drm_i915_gem_object *obj)
      GEM_BUG_ON(obj->mm.n_placements > I915_TTM_MAX_PLACEMENTS);
        /* Move to the requested placement. */
-    i915_ttm_placement_from_obj(obj, &requested, busy, &placement);
+    i915_ttm_placement_from_obj(obj, places, &placement);
        return __i915_ttm_get_pages(obj, &placement);
  }
@@ -879,9 +874,7 @@ static int __i915_ttm_migrate(struct drm_i915_gem_object *obj,
      i915_ttm_place_from_region(mr, &requested, obj->bo_offset,
                     obj->base.size, flags);
      placement.num_placement = 1;
-    placement.num_busy_placement = 1;
      placement.placement = &requested;
-    placement.busy_placement = &requested;
        ret = __i915_ttm_get_pages(obj, &placement);
      if (ret)
diff --git a/drivers/gpu/drm/loongson/lsdc_ttm.c b/drivers/gpu/drm/loongson/lsdc_ttm.c
index bf79dc55afa4..465f622ac05d 100644
--- a/drivers/gpu/drm/loongson/lsdc_ttm.c
+++ b/drivers/gpu/drm/loongson/lsdc_ttm.c
@@ -54,7 +54,6 @@ static void lsdc_bo_set_placement(struct lsdc_bo *lbo, u32 domain)
          pflags |= TTM_PL_FLAG_TOPDOWN;
        lbo->placement.placement = lbo->placements;
-    lbo->placement.busy_placement = lbo->placements;
        if (domain & LSDC_GEM_DOMAIN_VRAM) {
          lbo->placements[c].mem_type = TTM_PL_VRAM;
@@ -77,7 +76,6 @@ static void lsdc_bo_set_placement(struct lsdc_bo *lbo, u32 domain)
      }
        lbo->placement.num_placement = c;
-    lbo->placement.num_busy_placement = c;
        for (i = 0; i < c; ++i) {
          lbo->placements[i].fpfn = 0;
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 00cc7d1abaa3..56dcd25db1ce 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -404,27 +404,6 @@ nouveau_bo_new(struct nouveau_cli *cli, u64 size, int align,
      return 0;
  }
  -static void
-set_placement_list(struct ttm_place *pl, unsigned *n, uint32_t domain)
-{
-    *n = 0;
-
-    if (domain & NOUVEAU_GEM_DOMAIN_VRAM) {
-        pl[*n].mem_type = TTM_PL_VRAM;
-        pl[*n].flags = 0;
-        (*n)++;
-    }
-    if (domain & NOUVEAU_GEM_DOMAIN_GART) {
-        pl[*n].mem_type = TTM_PL_TT;
-        pl[*n].flags = 0;
-        (*n)++;
-    }
-    if (domain & NOUVEAU_GEM_DOMAIN_CPU) {
-        pl[*n].mem_type = TTM_PL_SYSTEM;
-        pl[(*n)++].flags = 0;
-    }
-}
-
  static void
  set_placement_range(struct nouveau_bo *nvbo, uint32_t domain)
  {
@@ -452,10 +431,6 @@ set_placement_range(struct nouveau_bo *nvbo, uint32_t domain)
              nvbo->placements[i].fpfn = fpfn;
              nvbo->placements[i].lpfn = lpfn;
          }
-        for (i = 0; i < nvbo->placement.num_busy_placement; ++i) {
-            nvbo->busy_placements[i].fpfn = fpfn;
-            nvbo->busy_placements[i].lpfn = lpfn;
-        }
      }
  }
  @@ -463,15 +438,32 @@ void
  nouveau_bo_placement_set(struct nouveau_bo *nvbo, uint32_t domain,
               uint32_t busy)
  {
-    struct ttm_placement *pl = &nvbo->placement;
+    unsigned int *n = &nvbo->placement.num_placement;
+    struct ttm_place *pl = nvbo->placements;
  -    pl->placement = nvbo->placements;
-    set_placement_list(nvbo->placements, &pl->num_placement, domain);
+    domain |= busy;
  -    pl->busy_placement = nvbo->busy_placements;
-    set_placement_list(nvbo->busy_placements, &pl->num_busy_placement,
-               domain | busy);
+    *n = 0;
+    if (domain & NOUVEAU_GEM_DOMAIN_VRAM) {
+        pl[*n].mem_type = TTM_PL_VRAM;
+        pl[*n].flags = busy & NOUVEAU_GEM_DOMAIN_VRAM ?
+            TTM_PL_FLAG_FALLBACK : 0;
+        (*n)++;
+    }
+    if (domain & NOUVEAU_GEM_DOMAIN_GART) {
+        pl[*n].mem_type = TTM_PL_TT;
+        pl[*n].flags = busy & NOUVEAU_GEM_DOMAIN_GART ?
+            TTM_PL_FLAG_FALLBACK : 0;
+        (*n)++;
+    }
+    if (domain & NOUVEAU_GEM_DOMAIN_CPU) {
+        pl[*n].mem_type = TTM_PL_SYSTEM;
+        pl[*n].flags = busy & NOUVEAU_GEM_DOMAIN_CPU ?
+            TTM_PL_FLAG_FALLBACK : 0;
+        (*n)++;
+    }
  +    nvbo->placement.placement = nvbo->placements;
      set_placement_range(nvbo, domain);
  }
  @@ -1314,11 +1306,6 @@ vm_fault_t nouveau_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
              nvbo->placements[i].lpfn = mappable;
          }
  -        for (i = 0; i < nvbo->placement.num_busy_placement; ++i) {
-            nvbo->busy_placements[i].fpfn = 0;
-            nvbo->busy_placements[i].lpfn = mappable;
-        }
-
          nouveau_bo_placement_set(nvbo, NOUVEAU_GEM_DOMAIN_VRAM, 0);
      }
  diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.h b/drivers/gpu/drm/nouveau/nouveau_bo.h
index 70c551921a9e..e9dfab6a8156 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.h
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.h
@@ -15,7 +15,6 @@ struct nouveau_bo {
      struct ttm_placement placement;
      u32 valid_domains;
      struct ttm_place placements[3];
-    struct ttm_place busy_placements[3];
      bool force_coherent;
      struct ttm_bo_kmap_obj kmap;
      struct list_head head;
diff --git a/drivers/gpu/drm/qxl/qxl_object.c b/drivers/gpu/drm/qxl/qxl_object.c
index 06a58dad5f5c..1e46b0a6e478 100644
--- a/drivers/gpu/drm/qxl/qxl_object.c
+++ b/drivers/gpu/drm/qxl/qxl_object.c
@@ -66,7 +66,6 @@ void qxl_ttm_placement_from_domain(struct qxl_bo *qbo, u32 domain)
          pflag |= TTM_PL_FLAG_TOPDOWN;
        qbo->placement.placement = qbo->placements;
-    qbo->placement.busy_placement = qbo->placements;
      if (domain == QXL_GEM_DOMAIN_VRAM) {
          qbo->placements[c].mem_type = TTM_PL_VRAM;
          qbo->placements[c++].flags = pflag;
@@ -86,7 +85,6 @@ void qxl_ttm_placement_from_domain(struct qxl_bo *qbo, u32 domain)
          qbo->placements[c++].flags = 0;
      }
      qbo->placement.num_placement = c;
-    qbo->placement.num_busy_placement = c;
      for (i = 0; i < c; ++i) {
          qbo->placements[i].fpfn = 0;
          qbo->placements[i].lpfn = 0;
diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index 1a82629bce3f..765a144cea14 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -60,9 +60,7 @@ static void qxl_evict_flags(struct ttm_buffer_object *bo,
        if (!qxl_ttm_bo_is_qxl_bo(bo)) {
          placement->placement = &placements;
-        placement->busy_placement = &placements;
          placement->num_placement = 1;
-        placement->num_busy_placement = 1;
          return;
      }
      qbo = to_qxl_bo(bo);
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 10c0fbd9d2b4..a955f8a2f7fe 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -78,7 +78,6 @@ void radeon_ttm_placement_from_domain(struct radeon_bo *rbo, u32 domain)
      u32 c = 0, i;
        rbo->placement.placement = rbo->placements;
-    rbo->placement.busy_placement = rbo->placements;
      if (domain & RADEON_GEM_DOMAIN_VRAM) {
          /* Try placing BOs which don't need CPU access outside of the
           * CPU accessible part of VRAM
@@ -114,7 +113,6 @@ void radeon_ttm_placement_from_domain(struct radeon_bo *rbo, u32 domain)
      }
        rbo->placement.num_placement = c;
-    rbo->placement.num_busy_placement = c;
        for (i = 0; i < c; ++i) {
          if ((rbo->flags & RADEON_GEM_CPU_ACCESS) &&
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index de4e6d78f1e1..2078b0000e22 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -92,9 +92,7 @@ static void radeon_evict_flags(struct ttm_buffer_object *bo,
        if (!radeon_ttm_bo_is_radeon_bo(bo)) {
          placement->placement = &placements;
-        placement->busy_placement = &placements;
          placement->num_placement = 1;
-        placement->num_busy_placement = 1;
          return;
      }
      rbo = container_of(bo, struct radeon_bo, tbo);
@@ -114,15 +112,11 @@ static void radeon_evict_flags(struct ttm_buffer_object *bo,
               */
              radeon_ttm_placement_from_domain(rbo, RADEON_GEM_DOMAIN_VRAM |
                               RADEON_GEM_DOMAIN_GTT);
-            rbo->placement.num_busy_placement = 0;
              for (i = 0; i < rbo->placement.num_placement; i++) {
                  if (rbo->placements[i].mem_type == TTM_PL_VRAM) {
                      if (rbo->placements[i].fpfn < fpfn)
                          rbo->placements[i].fpfn = fpfn;
-                } else {
-                    rbo->placement.busy_placement =
-                        &rbo->placements[i];
-                    rbo->placement.num_busy_placement = 1;
+                    rbo->placements[0].flags |= TTM_PL_FLAG_DESIRED;
                  }
              }
          } else
diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
index a2cda184b2b2..058a1c8451b2 100644
--- a/drivers/gpu/drm/radeon/radeon_uvd.c
+++ b/drivers/gpu/drm/radeon/radeon_uvd.c
@@ -324,7 +324,6 @@ void radeon_uvd_force_into_uvd_segment(struct radeon_bo *rbo,
      rbo->placements[1].fpfn += (256 * 1024 * 1024) >> PAGE_SHIFT;
      rbo->placements[1].lpfn += (256 * 1024 * 1024) >> PAGE_SHIFT;
      rbo->placement.num_placement++;
-    rbo->placement.num_busy_placement++;
  }
    void radeon_uvd_free_handles(struct radeon_device *rdev, struct drm_file *filp)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 8c1eaa74fa21..a5e11a92e0b9 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -410,8 +410,8 @@ static int ttm_bo_bounce_temp_buffer(struct ttm_buffer_object *bo,
      struct ttm_resource *hop_mem;
      int ret;
  -    hop_placement.num_placement = hop_placement.num_busy_placement = 1;
-    hop_placement.placement = hop_placement.busy_placement = hop;
+    hop_placement.num_placement = 1;
+    hop_placement.placement = hop;
        /* find space in the bounce domain */
      ret = ttm_bo_mem_space(bo, &hop_placement, &hop_mem, ctx);
@@ -440,10 +440,9 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
      dma_resv_assert_held(bo->base.resv);
        placement.num_placement = 0;
-    placement.num_busy_placement = 0;
      bdev->funcs->evict_flags(bo, &placement);
  -    if (!placement.num_placement && !placement.num_busy_placement) {
+    if (!placement.num_placement) {
          ret = ttm_bo_wait_ctx(bo, ctx);
          if (ret)
              return ret;
@@ -791,6 +790,9 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
          const struct ttm_place *place = &placement->placement[i];
          struct ttm_resource_manager *man;
  +        if (place->flags & TTM_PL_FLAG_FALLBACK)
+            continue;
+
          man = ttm_manager_type(bdev, place->mem_type);
          if (!man || !ttm_resource_manager_used(man))
              continue;
@@ -813,10 +815,13 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
          return 0;
      }
  -    for (i = 0; i < placement->num_busy_placement; ++i) {
-        const struct ttm_place *place = &placement->busy_placement[i];
+    for (i = 0; i < placement->num_placement; ++i) {
+        const struct ttm_place *place = &placement->placement[i];
          struct ttm_resource_manager *man;
  +        if (place->flags & TTM_PL_FLAG_DESIRED)
+            continue;
+
          man = ttm_manager_type(bdev, place->mem_type);
          if (!man || !ttm_resource_manager_used(man))
              continue;
@@ -904,11 +909,11 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
      /*
       * Remove the backing store if no placement is given.
       */
-    if (!placement->num_placement && !placement->num_busy_placement)
+    if (!placement->num_placement)
          return ttm_bo_pipeline_gutting(bo);
        /* Check whether we need to move buffer. */
-    if (bo->resource && ttm_resource_compat(bo->resource, placement))
+    if (bo->resource && ttm_resource_compatible(bo->resource, placement))
          return 0;
        /* Moving of pinned BOs is forbidden */
diff --git a/drivers/gpu/drm/ttm/ttm_resource.c b/drivers/gpu/drm/ttm/ttm_resource.c
index 02b96d23fdb9..fb14f7716cf8 100644
--- a/drivers/gpu/drm/ttm/ttm_resource.c
+++ b/drivers/gpu/drm/ttm/ttm_resource.c
@@ -291,37 +291,15 @@ bool ttm_resource_intersects(struct ttm_device *bdev,
  }
    /**
- * ttm_resource_compatible - test for compatibility
+ * ttm_resource_compatible - check if resource is compatible with placement
   *
- * @bdev: TTM device structure
- * @res: The resource to test
- * @place: The placement to test
- * @size: How many bytes the new allocation needs.
- *
- * Test if @res compatible with @place and @size.
+ * @res: the resource to check
+ * @placement: the placement to check against
   *
- * Returns true if the res placement compatible with @place and @size.
+ * Returns true if the placement is compatible.
   */
-bool ttm_resource_compatible(struct ttm_device *bdev,
-                 struct ttm_resource *res,
-                 const struct ttm_place *place,
-                 size_t size)
-{
-    struct ttm_resource_manager *man;
-
-    if (!res || !place)
-        return false;
-
-    man = ttm_manager_type(bdev, res->mem_type);
-    if (!man->func->compatible)
-        return true;
-
-    return man->func->compatible(man, res, place, size);
-}
-
-static bool ttm_resource_places_compat(struct ttm_resource *res,
-                       const struct ttm_place *places,
-                       unsigned num_placement)
+bool ttm_resource_compatible(struct ttm_resource *res,
+                 struct ttm_placement *placement)
  {
      struct ttm_buffer_object *bo = res->bo;
      struct ttm_device *bdev = bo->bdev;
@@ -330,44 +308,25 @@ static bool ttm_resource_places_compat(struct ttm_resource *res,
      if (res->placement & TTM_PL_FLAG_TEMPORARY)
          return false;
  -    for (i = 0; i < num_placement; i++) {
-        const struct ttm_place *heap = &places[i];
+    for (i = 0; i < placement->num_placement; i++) {
+        const struct ttm_place *place = &placement->placement[i];
+        struct ttm_resource_manager *man;
  -        if (!ttm_resource_compatible(bdev, res, heap, bo->base.size))
+        if (res->mem_type != place->mem_type)
+            continue;
+
+        man = ttm_manager_type(bdev, res->mem_type);
+        if (man->func->compatible &&
+            !man->func->compatible(man, res, place, bo->base.size))
              continue;
  -        if ((res->mem_type == heap->mem_type) &&
-            (!(heap->flags & TTM_PL_FLAG_CONTIGUOUS) ||
+        if ((!(place->flags & TTM_PL_FLAG_CONTIGUOUS) ||
               (res->placement & TTM_PL_FLAG_CONTIGUOUS)))
              return true;
      }
      return false;
  }
  -/**
- * ttm_resource_compat - check if resource is compatible with placement
- *
- * @res: the resource to check
- * @placement: the placement to check against
- *
- * Returns true if the placement is compatible.
- */
-bool ttm_resource_compat(struct ttm_resource *res,
-             struct ttm_placement *placement)
-{
-    if (ttm_resource_places_compat(res, placement->placement,
-                       placement->num_placement))
-        return true;
-
-    if ((placement->busy_placement != placement->placement ||
-         placement->num_busy_placement > placement->num_placement) &&
-        ttm_resource_places_compat(res, placement->busy_placement,
-                       placement->num_busy_placement))
-        return true;
-
-    return false;
-}
-
  void ttm_resource_set_bo(struct ttm_resource *res,
               struct ttm_buffer_object *bo)
  {
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
index 2bfac3aad7b7..bfd41ce3c8f4 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -742,9 +742,21 @@ void vmw_bo_move_notify(struct ttm_buffer_object *bo,
          vmw_resource_unbind_list(vbo);
  }
  +static u32 placement_flags(u32 domain, u32 desired, u32 fallback)
+{
+    if (desired & fallback & domain)
+        return 0;
+
+    if (desired & domain)
+        return TTM_PL_FLAG_DESIRED;
+
+    return TTM_PL_FLAG_FALLBACK;
+}
+
  static u32
-set_placement_list(struct ttm_place *pl, u32 domain)
+set_placement_list(struct ttm_place *pl, u32 desired, u32 fallback)
  {
+    u32 domain = desired | fallback;
      u32 n = 0;
        /*
@@ -752,35 +764,40 @@ set_placement_list(struct ttm_place *pl, u32 domain)
       */
      if (domain & VMW_BO_DOMAIN_MOB) {
          pl[n].mem_type = VMW_PL_MOB;
-        pl[n].flags = 0;
+        pl[n].flags = placement_flags(VMW_BO_DOMAIN_MOB, desired,
+                          fallback);
          pl[n].fpfn = 0;
          pl[n].lpfn = 0;
          n++;
      }
      if (domain & VMW_BO_DOMAIN_GMR) {
          pl[n].mem_type = VMW_PL_GMR;
-        pl[n].flags = 0;
+        pl[n].flags = placement_flags(VMW_BO_DOMAIN_GMR, desired,
+                          fallback);
          pl[n].fpfn = 0;
          pl[n].lpfn = 0;
          n++;
      }
      if (domain & VMW_BO_DOMAIN_VRAM) {
          pl[n].mem_type = TTM_PL_VRAM;
-        pl[n].flags = 0;
+        pl[n].flags = placement_flags(VMW_BO_DOMAIN_VRAM, desired,
+                          fallback);
          pl[n].fpfn = 0;
          pl[n].lpfn = 0;
          n++;
      }
      if (domain & VMW_BO_DOMAIN_WAITABLE_SYS) {
          pl[n].mem_type = VMW_PL_SYSTEM;
-        pl[n].flags = 0;
+        pl[n].flags = placement_flags(VMW_BO_DOMAIN_WAITABLE_SYS,
+                          desired, fallback);
          pl[n].fpfn = 0;
          pl[n].lpfn = 0;
          n++;
      }
      if (domain & VMW_BO_DOMAIN_SYS) {
          pl[n].mem_type = TTM_PL_SYSTEM;
-        pl[n].flags = 0;
+        pl[n].flags = placement_flags(VMW_BO_DOMAIN_SYS, desired,
+                          fallback);
          pl[n].fpfn = 0;
          pl[n].lpfn = 0;
          n++;
@@ -806,7 +823,7 @@ void vmw_bo_placement_set(struct vmw_bo *bo, u32 domain, u32 busy_domain)
      u32 i;
        pl->placement = bo->places;
-    pl->num_placement = set_placement_list(bo->places, domain);
+    pl->num_placement = set_placement_list(bo->places, domain, busy_domain);
        if (drm_debug_enabled(DRM_UT_DRIVER) && bo->tbo.resource) {
          for (i = 0; i < pl->num_placement; ++i) {
@@ -821,8 +838,6 @@ void vmw_bo_placement_set(struct vmw_bo *bo, u32 domain, u32 busy_domain)
                   __func__, bo->tbo.resource->mem_type, domain);
      }
  -    pl->busy_placement = bo->busy_places;
-    pl->num_busy_placement = set_placement_list(bo->busy_places, busy_domain);
  }
    void vmw_bo_placement_set_default_accelerated(struct vmw_bo *bo)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
index a84fffcef8e1..4d23d0a70bcb 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
@@ -46,15 +46,11 @@ static const struct ttm_place sys_placement_flags = {
  struct ttm_placement vmw_vram_placement = {
      .num_placement = 1,
      .placement = &vram_placement_flags,
-    .num_busy_placement = 1,
-    .busy_placement = &vram_placement_flags
  };
    struct ttm_placement vmw_sys_placement = {
      .num_placement = 1,
      .placement = &sys_placement_flags,
-    .num_busy_placement = 1,
-    .busy_placement = &sys_placement_flags
  };
    const size_t vmw_tt_size = sizeof(struct vmw_ttm_tt);
diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index 8e4a3b1f6b93..1e5edc7f0b85 100644
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -38,22 +38,26 @@ static const struct ttm_place sys_placement_flags = {
  static struct ttm_placement sys_placement = {
      .num_placement = 1,
      .placement = &sys_placement_flags,
-    .num_busy_placement = 1,
-    .busy_placement = &sys_placement_flags,
  };
  -static const struct ttm_place tt_placement_flags = {
-    .fpfn = 0,
-    .lpfn = 0,
-    .mem_type = XE_PL_TT,
-    .flags = 0,
+static const struct ttm_place tt_placement_flags[] = {
+    {
+        .fpfn = 0,
+        .lpfn = 0,
+        .mem_type = XE_PL_TT,
+        .flags = TTM_PL_FLAG_DESIRED,
+    },
+    {
+        .fpfn = 0,
+        .lpfn = 0,
+        .mem_type = XE_PL_SYSTEM,
+        .flags = TTM_PL_FLAG_FALLBACK,
+    }
  };
    static struct ttm_placement tt_placement = {
-    .num_placement = 1,
-    .placement = &tt_placement_flags,
-    .num_busy_placement = 1,
-    .busy_placement = &sys_placement_flags,
+    .num_placement = 2,
+    .placement = tt_placement_flags,
  };
    bool mem_type_is_vram(u32 mem_type)
@@ -230,8 +234,6 @@ static int __xe_bo_placement_for_flags(struct xe_device *xe, struct xe_bo *bo,
      bo->placement = (struct ttm_placement) {
          .num_placement = c,
          .placement = bo->placements,
-        .num_busy_placement = c,
-        .busy_placement = bo->placements,
      };
        return 0;
@@ -251,7 +253,6 @@ static void xe_evict_flags(struct ttm_buffer_object *tbo,
          /* Don't handle scatter gather BOs */
          if (tbo->type == ttm_bo_type_sg) {
              placement->num_placement = 0;
-            placement->num_busy_placement = 0;
              return;
          }
  @@ -1353,8 +1354,6 @@ static int __xe_bo_fixed_placement(struct xe_device *xe,
      bo->placement = (struct ttm_placement) {
          .num_placement = 1,
          .placement = place,
-        .num_busy_placement = 1,
-        .busy_placement = place,
      };
        return 0;
@@ -2112,9 +2111,7 @@ int xe_bo_migrate(struct xe_bo *bo, u32 mem_type)
        xe_place_from_ttm_type(mem_type, &requested);
      placement.num_placement = 1;
-    placement.num_busy_placement = 1;
      placement.placement = &requested;
-    placement.busy_placement = &requested;
        /*
       * Stolen needs to be handled like below VRAM handling if we ever need diff --git a/include/drm/ttm/ttm_placement.h b/include/drm/ttm/ttm_placement.h
index 8074d0f6cae5..b510a4812609 100644
--- a/include/drm/ttm/ttm_placement.h
+++ b/include/drm/ttm/ttm_placement.h
@@ -64,6 +64,12 @@
  /* For multihop handling */
  #define TTM_PL_FLAG_TEMPORARY   (1 << 2)
  +/* Placement is never used during eviction */
+#define TTM_PL_FLAG_DESIRED    (1 << 3)
+
+/* Placement is only used during eviction */
+#define TTM_PL_FLAG_FALLBACK    (1 << 4)
+
  /**
   * struct ttm_place
   *
@@ -86,16 +92,12 @@ struct ttm_place {
   *
   * @num_placement:    number of preferred placements
   * @placement:        preferred placements
- * @num_busy_placement:    number of preferred placements when need to evict buffer
- * @busy_placement:    preferred placements when need to evict buffer
   *
   * Structure indicating the placement you request for an object.
   */
  struct ttm_placement {
      unsigned        num_placement;
      const struct ttm_place    *placement;
-    unsigned        num_busy_placement;
-    const struct ttm_place    *busy_placement;
  };
    #endif
diff --git a/include/drm/ttm/ttm_resource.h b/include/drm/ttm/ttm_resource.h
index 78a226eba953..1afa13f0c22b 100644
--- a/include/drm/ttm/ttm_resource.h
+++ b/include/drm/ttm/ttm_resource.h
@@ -365,12 +365,8 @@ bool ttm_resource_intersects(struct ttm_device *bdev,
                   struct ttm_resource *res,
                   const struct ttm_place *place,
                   size_t size);
-bool ttm_resource_compatible(struct ttm_device *bdev,
-                 struct ttm_resource *res,
-                 const struct ttm_place *place,
-                 size_t size);
-bool ttm_resource_compat(struct ttm_resource *res,
-             struct ttm_placement *placement);
+bool ttm_resource_compatible(struct ttm_resource *res,
+                 struct ttm_placement *placement);
  void ttm_resource_set_bo(struct ttm_resource *res,
               struct ttm_buffer_object *bo);



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