drm/ttm: Rework validation & memory space allocation (V3)

This change allow driver to pass sorted memory placement,
from most prefered placement to least prefered placement.
In order to avoid long function prototype a structure is
used to gather memory placement informations such as range
restriction (if you need a buffer to be in given range).
Range restriction is determined by fpfn & lpfn which are
the first page and last page number btw which allocation
can happen. If those fields are set to 0 ttm will assume
buffer can be put anywhere in the address space (thus it
avoids putting a burden on the driver to always properly
set those fields).

This patch also factor few functions like evicting first
entry of lru list or getting a memory space. This avoid
code duplication.

V2: Change API to use placement flags and array instead
    of packing placement order into a quadword.
V3: Make sure we set the appropriate mem.placement flag
    when validating or allocation memory space.

[Pending Thomas Hellstrom further review but okay
from preliminary review so far].

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

3 files changed, 256 insertions, 269 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index e13fd23f3334..60d8179a8bcd 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -27,6 +27,14 @@
 /*
  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  */
+/* Notes:
+ *
+ * We store bo pointer in drm_mm_node struct so we know which bo own a
+ * specific node. There is no protection on the pointer, thus to make
+ * sure things don't go berserk you have to access this pointer while
+ * holding the global lru lock and make sure anytime you free a node you
+ * reset the pointer to NULL.
+ */
 
 #include "ttm/ttm_module.h"
 #include "ttm/ttm_bo_driver.h"
@@ -247,7 +255,6 @@ EXPORT_SYMBOL(ttm_bo_unreserve);
 /*
  * Call bo->mutex locked.
  */
-
 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 {
         struct ttm_bo_device *bdev = bo->bdev;
@@ -329,14 +336,8 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
                 }
 
                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
-
-                        struct ttm_mem_reg *old_mem = &bo->mem;
-                        uint32_t save_flags = old_mem->placement;
-
-                        *old_mem = *mem;
+                        bo->mem = *mem;
                         mem->mm_node = NULL;
-                        ttm_flag_masked(&save_flags, mem->placement,
-                                        TTM_PL_MASK_MEMTYPE);
                         goto moved;
                 }
 
@@ -419,6 +420,7 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
                         kref_put(&bo->list_kref, ttm_bo_ref_bug);
                 }
                 if (bo->mem.mm_node) {
+                        bo->mem.mm_node->private = NULL;
                         drm_mm_put_block(bo->mem.mm_node);
                         bo->mem.mm_node = NULL;
                 }
@@ -555,17 +557,14 @@ void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 }
 EXPORT_SYMBOL(ttm_bo_unref);
 
-static int ttm_bo_evict(struct ttm_buffer_object *bo, unsigned mem_type,
-                        bool interruptible, bool no_wait)
+static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
+                        bool no_wait)
 {
-        int ret = 0;
         struct ttm_bo_device *bdev = bo->bdev;
         struct ttm_bo_global *glob = bo->glob;
         struct ttm_mem_reg evict_mem;
-        uint32_t proposed_placement;
-
-        if (bo->mem.mem_type != mem_type)
-                goto out;
+        struct ttm_placement placement;
+        int ret = 0;
 
         spin_lock(&bo->lock);
         ret = ttm_bo_wait(bo, false, interruptible, no_wait);
@@ -585,14 +584,9 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo, unsigned mem_type,
         evict_mem = bo->mem;
         evict_mem.mm_node = NULL;
 
-        proposed_placement = bdev->driver->evict_flags(bo);
-
-        ret = ttm_bo_mem_space(bo, proposed_placement,
-                               &evict_mem, interruptible, no_wait);
-        if (unlikely(ret != 0 && ret != -ERESTART))
-                ret = ttm_bo_mem_space(bo, TTM_PL_FLAG_SYSTEM,
-                                       &evict_mem, interruptible, no_wait);
-
+        bdev->driver->evict_flags(bo, &placement);
+        ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
+                                no_wait);
         if (ret) {
                 if (ret != -ERESTART)
                         printk(KERN_ERR TTM_PFX
@@ -606,95 +600,117 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo, unsigned mem_type,
         if (ret) {
                 if (ret != -ERESTART)
                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
+                spin_lock(&glob->lru_lock);
+                if (evict_mem.mm_node) {
+                        evict_mem.mm_node->private = NULL;
+                        drm_mm_put_block(evict_mem.mm_node);
+                        evict_mem.mm_node = NULL;
+                }
+                spin_unlock(&glob->lru_lock);
                 goto out;
         }
+        bo->evicted = true;
+out:
+        return ret;
+}
+
+static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
+                                uint32_t mem_type,
+                                bool interruptible, bool no_wait)
+{
+        struct ttm_bo_global *glob = bdev->glob;
+        struct ttm_mem_type_manager *man = &bdev->man[mem_type];
+        struct ttm_buffer_object *bo;
+        int ret, put_count = 0;
 
         spin_lock(&glob->lru_lock);
-        if (evict_mem.mm_node) {
-                drm_mm_put_block(evict_mem.mm_node);
-                evict_mem.mm_node = NULL;
-        }
+        bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
+        kref_get(&bo->list_kref);
+        ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, false, 0);
+        if (likely(ret == 0))
+                put_count = ttm_bo_del_from_lru(bo);
         spin_unlock(&glob->lru_lock);
-        bo->evicted = true;
-out:
+        if (unlikely(ret != 0))
+                return ret;
+        while (put_count--)
+                kref_put(&bo->list_kref, ttm_bo_ref_bug);
+        ret = ttm_bo_evict(bo, interruptible, no_wait);
+        ttm_bo_unreserve(bo);
+        kref_put(&bo->list_kref, ttm_bo_release_list);
         return ret;
 }
 
+static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
+                                struct ttm_mem_type_manager *man,
+                                struct ttm_placement *placement,
+                                struct ttm_mem_reg *mem,
+                                struct drm_mm_node **node)
+{
+        struct ttm_bo_global *glob = bo->glob;
+        unsigned long lpfn;
+        int ret;
+
+        lpfn = placement->lpfn;
+        if (!lpfn)
+                lpfn = man->size;
+        *node = NULL;
+        do {
+                ret = drm_mm_pre_get(&man->manager);
+                if (unlikely(ret))
+                        return ret;
+
+                spin_lock(&glob->lru_lock);
+                *node = drm_mm_search_free_in_range(&man->manager,
+                                        mem->num_pages, mem->page_alignment,
+                                        placement->fpfn, lpfn, 1);
+                if (unlikely(*node == NULL)) {
+                        spin_unlock(&glob->lru_lock);
+                        return 0;
+                }
+                *node = drm_mm_get_block_atomic_range(*node, mem->num_pages,
+                                                        mem->page_alignment,
+                                                        placement->fpfn,
+                                                        lpfn);
+                spin_unlock(&glob->lru_lock);
+        } while (*node == NULL);
+        return 0;
+}
+
 /**
  * Repeatedly evict memory from the LRU for @mem_type until we create enough
  * space, or we've evicted everything and there isn't enough space.
  */
-static int ttm_bo_mem_force_space(struct ttm_bo_device *bdev,
-                                  struct ttm_mem_reg *mem,
-                                  uint32_t mem_type,
-                                  bool interruptible, bool no_wait)
+static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
+                                        uint32_t mem_type,
+                                        struct ttm_placement *placement,
+                                        struct ttm_mem_reg *mem,
+                                        bool interruptible, bool no_wait)
 {
+        struct ttm_bo_device *bdev = bo->bdev;
         struct ttm_bo_global *glob = bdev->glob;
-        struct drm_mm_node *node;
-        struct ttm_buffer_object *entry;
         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
-        struct list_head *lru;
-        unsigned long num_pages = mem->num_pages;
-        int put_count = 0;
+        struct drm_mm_node *node;
         int ret;
 
-retry_pre_get:
-        ret = drm_mm_pre_get(&man->manager);
-        if (unlikely(ret != 0))
-                return ret;
-
-        spin_lock(&glob->lru_lock);
         do {
-                node = drm_mm_search_free(&man->manager, num_pages,
-                                          mem->page_alignment, 1);
+                ret = ttm_bo_man_get_node(bo, man, placement, mem, &node);
+                if (unlikely(ret != 0))
+                        return ret;
                 if (node)
                         break;
-
-                lru = &man->lru;
-                if (list_empty(lru))
+                spin_lock(&glob->lru_lock);
+                if (list_empty(&man->lru)) {
+                        spin_unlock(&glob->lru_lock);
                         break;
-
-                entry = list_first_entry(lru, struct ttm_buffer_object, lru);
-                kref_get(&entry->list_kref);
-
-                ret =
-                    ttm_bo_reserve_locked(entry, interruptible, no_wait,
-                                          false, 0);
-
-                if (likely(ret == 0))
-                        put_count = ttm_bo_del_from_lru(entry);
-
+                }
                 spin_unlock(&glob->lru_lock);
-
+                ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
+                                                no_wait);
                 if (unlikely(ret != 0))
                         return ret;
-
-                while (put_count--)
-                        kref_put(&entry->list_kref, ttm_bo_ref_bug);
-
-                ret = ttm_bo_evict(entry, mem_type, interruptible, no_wait);
-
-                ttm_bo_unreserve(entry);
-
-                kref_put(&entry->list_kref, ttm_bo_release_list);
-                if (ret)
-                        return ret;
-
-                spin_lock(&glob->lru_lock);
         } while (1);
-
-        if (!node) {
-                spin_unlock(&glob->lru_lock);
+        if (node == NULL)
                 return -ENOMEM;
-        }
-
-        node = drm_mm_get_block_atomic(node, num_pages, mem->page_alignment);
-        if (unlikely(!node)) {
-                spin_unlock(&glob->lru_lock);
-                goto retry_pre_get;
-        }
-
-        spin_unlock(&glob->lru_lock);
         mem->mm_node = node;
         mem->mem_type = mem_type;
         return 0;
@@ -725,7 +741,6 @@ static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
         return result;
 }
 
-
 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
                                  bool disallow_fixed,
                                  uint32_t mem_type,
@@ -749,6 +764,18 @@ static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
         return true;
 }
 
+static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
+{
+        int i;
+
+        for (i = 0; i <= TTM_PL_PRIV5; i++)
+                if (flags & (1 << i)) {
+                        *mem_type = i;
+                        return 0;
+                }
+        return -EINVAL;
+}
+
 /**
  * Creates space for memory region @mem according to its type.
  *
@@ -758,66 +785,55 @@ static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
  * space.
  */
 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
-                     uint32_t proposed_placement,
-                     struct ttm_mem_reg *mem,
-                     bool interruptible, bool no_wait)
+                        struct ttm_placement *placement,
+                        struct ttm_mem_reg *mem,
+                        bool interruptible, bool no_wait)
 {
         struct ttm_bo_device *bdev = bo->bdev;
-        struct ttm_bo_global *glob = bo->glob;
         struct ttm_mem_type_manager *man;
-
-        uint32_t num_prios = bdev->driver->num_mem_type_prio;
-        const uint32_t *prios = bdev->driver->mem_type_prio;
-        uint32_t i;
         uint32_t mem_type = TTM_PL_SYSTEM;
         uint32_t cur_flags = 0;
         bool type_found = false;
         bool type_ok = false;
         bool has_eagain = false;
         struct drm_mm_node *node = NULL;
-        int ret;
+        int i, ret;
 
         mem->mm_node = NULL;
-        for (i = 0; i < num_prios; ++i) {
-                mem_type = prios[i];
+        for (i = 0; i <= placement->num_placement; ++i) {
+                ret = ttm_mem_type_from_flags(placement->placement[i],
+                                                &mem_type);
+                if (ret)
+                        return ret;
                 man = &bdev->man[mem_type];
 
                 type_ok = ttm_bo_mt_compatible(man,
-                                               bo->type == ttm_bo_type_user,
-                                               mem_type, proposed_placement,
-                                               &cur_flags);
+                                                bo->type == ttm_bo_type_user,
+                                                mem_type,
+                                                placement->placement[i],
+                                                &cur_flags);
 
                 if (!type_ok)
                         continue;
 
                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
                                                   cur_flags);
+                /*
+                 * Use the access and other non-mapping-related flag bits from
+                 * the memory placement flags to the current flags
+                 */
+                ttm_flag_masked(&cur_flags, placement->placement[i],
+                                ~TTM_PL_MASK_MEMTYPE);
 
                 if (mem_type == TTM_PL_SYSTEM)
                         break;
 
                 if (man->has_type && man->use_type) {
                         type_found = true;
-                        do {
-                                ret = drm_mm_pre_get(&man->manager);
-                                if (unlikely(ret))
-                                        return ret;
-
-                                spin_lock(&glob->lru_lock);
-                                node = drm_mm_search_free(&man->manager,
-                                                          mem->num_pages,
-                                                          mem->page_alignment,
-                                                          1);
-                                if (unlikely(!node)) {
-                                        spin_unlock(&glob->lru_lock);
-                                        break;
-                                }
-                                node = drm_mm_get_block_atomic(node,
-                                                               mem->num_pages,
-                                                               mem->
-                                                               page_alignment);
-                                spin_unlock(&glob->lru_lock);
-                        } while (!node);
+                        ret = ttm_bo_man_get_node(bo, man, placement, mem,
+                                                        &node);
+                        if (unlikely(ret))
+                                return ret;
                 }
                 if (node)
                         break;
@@ -827,43 +843,48 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
                 mem->mm_node = node;
                 mem->mem_type = mem_type;
                 mem->placement = cur_flags;
+                if (node)
+                        node->private = bo;
                 return 0;
         }
 
         if (!type_found)
                 return -EINVAL;
 
-        num_prios = bdev->driver->num_mem_busy_prio;
-        prios = bdev->driver->mem_busy_prio;
-
-        for (i = 0; i < num_prios; ++i) {
-                mem_type = prios[i];
+        for (i = 0; i <= placement->num_busy_placement; ++i) {
+                ret = ttm_mem_type_from_flags(placement->placement[i],
+                                                &mem_type);
+                if (ret)
+                        return ret;
                 man = &bdev->man[mem_type];
-
                 if (!man->has_type)
                         continue;
-
                 if (!ttm_bo_mt_compatible(man,
-                                          bo->type == ttm_bo_type_user,
-                                          mem_type,
-                                          proposed_placement, &cur_flags))
+                                                bo->type == ttm_bo_type_user,
+                                                mem_type,
+                                                placement->placement[i],
+                                                &cur_flags))
                         continue;
 
                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
                                                   cur_flags);
+                /*
+                 * Use the access and other non-mapping-related flag bits from
+                 * the memory placement flags to the current flags
+                 */
+                ttm_flag_masked(&cur_flags, placement->placement[i],
+                                ~TTM_PL_MASK_MEMTYPE);
 
-                ret = ttm_bo_mem_force_space(bdev, mem, mem_type,
-                                             interruptible, no_wait);
-
+                ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
+                                                interruptible, no_wait);
                 if (ret == 0 && mem->mm_node) {
                         mem->placement = cur_flags;
+                        mem->mm_node->private = bo;
                         return 0;
                 }
-
                 if (ret == -ERESTART)
                         has_eagain = true;
         }
-
         ret = (has_eagain) ? -ERESTART : -ENOMEM;
         return ret;
 }
@@ -886,8 +907,8 @@ int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
 }
 
 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
-                       uint32_t proposed_placement,
-                       bool interruptible, bool no_wait)
+                        struct ttm_placement *placement,
+                        bool interruptible, bool no_wait)
 {
         struct ttm_bo_global *glob = bo->glob;
         int ret = 0;
@@ -900,101 +921,82 @@ int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
          * Have the driver move function wait for idle when necessary,
          * instead of doing it here.
          */
-
         spin_lock(&bo->lock);
         ret = ttm_bo_wait(bo, false, interruptible, no_wait);
         spin_unlock(&bo->lock);
-
         if (ret)
                 return ret;
-
         mem.num_pages = bo->num_pages;
         mem.size = mem.num_pages << PAGE_SHIFT;
         mem.page_alignment = bo->mem.page_alignment;
-
         /*
          * Determine where to move the buffer.
          */
-
-        ret = ttm_bo_mem_space(bo, proposed_placement, &mem,
-                               interruptible, no_wait);
+        ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait);
         if (ret)
                 goto out_unlock;
-
         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait);
-
 out_unlock:
         if (ret && mem.mm_node) {
                 spin_lock(&glob->lru_lock);
+                mem.mm_node->private = NULL;
                 drm_mm_put_block(mem.mm_node);
                 spin_unlock(&glob->lru_lock);
         }
         return ret;
 }
 
-static int ttm_bo_mem_compat(uint32_t proposed_placement,
+static int ttm_bo_mem_compat(struct ttm_placement *placement,
                              struct ttm_mem_reg *mem)
 {
-        if ((proposed_placement & mem->placement & TTM_PL_MASK_MEM) == 0)
-                return 0;
-        if ((proposed_placement & mem->placement & TTM_PL_MASK_CACHING) == 0)
-                return 0;
-
-        return 1;
+        int i;
+
+        for (i = 0; i < placement->num_placement; i++) {
+                if ((placement->placement[i] & mem->placement &
+                        TTM_PL_MASK_CACHING) &&
+                        (placement->placement[i] & mem->placement &
+                        TTM_PL_MASK_MEM))
+                        return i;
+        }
+        return -1;
 }
 
 int ttm_buffer_object_validate(struct ttm_buffer_object *bo,
-                               uint32_t proposed_placement,
-                               bool interruptible, bool no_wait)
+                                struct ttm_placement *placement,
+                                bool interruptible, bool no_wait)
 {
         int ret;
 
         BUG_ON(!atomic_read(&bo->reserved));
-        bo->proposed_placement = proposed_placement;
-
-        TTM_DEBUG("Proposed placement 0x%08lx, Old flags 0x%08lx\n",
-                  (unsigned long)proposed_placement,
-                  (unsigned long)bo->mem.placement);
-
+        /* Check that range is valid */
+        if (placement->lpfn || placement->fpfn)
+                if (placement->fpfn > placement->lpfn ||
+                        (placement->lpfn - placement->fpfn) < bo->num_pages)
+                        return -EINVAL;
         /*
          * Check whether we need to move buffer.
          */
-
-        if (!ttm_bo_mem_compat(bo->proposed_placement, &bo->mem)) {
-                ret = ttm_bo_move_buffer(bo, bo->proposed_placement,
-                                         interruptible, no_wait);
-                if (ret) {
-                        if (ret != -ERESTART)
-                                printk(KERN_ERR TTM_PFX
-                                       "Failed moving buffer. "
-                                       "Proposed placement 0x%08x\n",
-                                       bo->proposed_placement);
-                        if (ret == -ENOMEM)
-                                printk(KERN_ERR TTM_PFX
-                                       "Out of aperture space or "
-                                       "DRM memory quota.\n");
+        ret = ttm_bo_mem_compat(placement, &bo->mem);
+        if (ret < 0) {
+                ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait);
+                if (ret)
                         return ret;
-                }
+        } else {
+                /*
+                 * Use the access and other non-mapping-related flag bits from
+                 * the compatible memory placement flags to the active flags
+                 */
+                ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
+                                ~TTM_PL_MASK_MEMTYPE);
         }
-
         /*
          * We might need to add a TTM.
          */
-
         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
                 ret = ttm_bo_add_ttm(bo, true);
                 if (ret)
                         return ret;
         }
-        /*
-         * Validation has succeeded, move the access and other
-         * non-mapping-related flag bits from the proposed flags to
-         * the active flags
-         */
-
-        ttm_flag_masked(&bo->mem.placement, bo->proposed_placement,
-                        ~TTM_PL_MASK_MEMTYPE);
-
         return 0;
 }
 EXPORT_SYMBOL(ttm_buffer_object_validate);
@@ -1042,8 +1044,10 @@ int ttm_buffer_object_init(struct ttm_bo_device *bdev,
                            size_t acc_size,
                            void (*destroy) (struct ttm_buffer_object *))
 {
-        int ret = 0;
+        int i, c, ret = 0;
         unsigned long num_pages;
+        uint32_t placements[8];
+        struct ttm_placement placement;
 
         size += buffer_start & ~PAGE_MASK;
         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
@@ -1100,7 +1104,16 @@ int ttm_buffer_object_init(struct ttm_bo_device *bdev,
                         goto out_err;
         }
 
-        ret = ttm_buffer_object_validate(bo, flags, interruptible, false);
+        placement.fpfn = 0;
+        placement.lpfn = 0;
+        for (i = 0, c = 0; i <= TTM_PL_PRIV5; i++)
+                if (flags & (1 << i))
+                        placements[c++] = (flags & ~TTM_PL_MASK_MEM) | (1 << i);
+        placement.placement = placements;
+        placement.num_placement = c;
+        placement.busy_placement = placements;
+        placement.num_busy_placement = c;
+        ret = ttm_buffer_object_validate(bo, &placement, interruptible, false);
         if (ret)
                 goto out_err;
 
@@ -1135,8 +1148,8 @@ int ttm_buffer_object_create(struct ttm_bo_device *bdev,
                              struct ttm_buffer_object **p_bo)
 {
         struct ttm_buffer_object *bo;
-        int ret;
         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
+        int ret;
 
         size_t acc_size =
             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
@@ -1161,66 +1174,32 @@ int ttm_buffer_object_create(struct ttm_bo_device *bdev,
         return ret;
 }
 
-static int ttm_bo_leave_list(struct ttm_buffer_object *bo,
-                             uint32_t mem_type, bool allow_errors)
-{
-        int ret;
-
-        spin_lock(&bo->lock);
-        ret = ttm_bo_wait(bo, false, false, false);
-        spin_unlock(&bo->lock);
-
-        if (ret && allow_errors)
-                goto out;
-
-        if (bo->mem.mem_type == mem_type)
-                ret = ttm_bo_evict(bo, mem_type, false, false);
-
-        if (ret) {
-                if (allow_errors) {
-                        goto out;
-                } else {
-                        ret = 0;
-                        printk(KERN_ERR TTM_PFX "Cleanup eviction failed\n");
-                }
-        }
-
-out:
-        return ret;
-}
-
 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
-                                   struct list_head *head,
-                                   unsigned mem_type, bool allow_errors)
+                                        unsigned mem_type, bool allow_errors)
 {
+        struct ttm_mem_type_manager *man = &bdev->man[mem_type];
         struct ttm_bo_global *glob = bdev->glob;
-        struct ttm_buffer_object *entry;
         int ret;
-        int put_count;
 
         /*
          * Can't use standard list traversal since we're unlocking.
          */
 
         spin_lock(&glob->lru_lock);
-
-        while (!list_empty(head)) {
-                entry = list_first_entry(head, struct ttm_buffer_object, lru);
-                kref_get(&entry->list_kref);
-                ret = ttm_bo_reserve_locked(entry, false, false, false, 0);
-                put_count = ttm_bo_del_from_lru(entry);
+        while (!list_empty(&man->lru)) {
                 spin_unlock(&glob->lru_lock);
-                while (put_count--)
-                        kref_put(&entry->list_kref, ttm_bo_ref_bug);
-                BUG_ON(ret);
-                ret = ttm_bo_leave_list(entry, mem_type, allow_errors);
-                ttm_bo_unreserve(entry);
-                kref_put(&entry->list_kref, ttm_bo_release_list);
+                ret = ttm_mem_evict_first(bdev, mem_type, false, false);
+                if (ret) {
+                        if (allow_errors) {
+                                return ret;
+                        } else {
+                                printk(KERN_ERR TTM_PFX
+                                        "Cleanup eviction failed\n");
+                        }
+                }
                 spin_lock(&glob->lru_lock);
         }
-
         spin_unlock(&glob->lru_lock);
-
         return 0;
 }
 
@@ -1247,7 +1226,7 @@ int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
 
         ret = 0;
         if (mem_type > 0) {
-                ttm_bo_force_list_clean(bdev, &man->lru, mem_type, false);
+                ttm_bo_force_list_clean(bdev, mem_type, false);
 
                 spin_lock(&glob->lru_lock);
                 if (drm_mm_clean(&man->manager))
@@ -1280,12 +1259,12 @@ int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
                 return 0;
         }
 
-        return ttm_bo_force_list_clean(bdev, &man->lru, mem_type, true);
+        return ttm_bo_force_list_clean(bdev, mem_type, true);
 }
 EXPORT_SYMBOL(ttm_bo_evict_mm);
 
 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
-                   unsigned long p_offset, unsigned long p_size)
+                        unsigned long p_size)
 {
         int ret = -EINVAL;
         struct ttm_mem_type_manager *man;
@@ -1315,7 +1294,7 @@ int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
                                type);
                         return ret;
                 }
-                ret = drm_mm_init(&man->manager, p_offset, p_size);
+                ret = drm_mm_init(&man->manager, 0, p_size);
                 if (ret)
                         return ret;
         }
@@ -1464,7 +1443,7 @@ int ttm_bo_device_init(struct ttm_bo_device *bdev,
          * Initialize the system memory buffer type.
          * Other types need to be driver / IOCTL initialized.
          */
-        ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0, 0);
+        ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
         if (unlikely(ret != 0))
                 goto out_no_sys;
 
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 491146170522..2f7f56da2147 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -44,6 +44,29 @@ struct ttm_bo_device;
 
 struct drm_mm_node;
 
+
+/**
+ * struct ttm_placement
+ *
+ * @fpfn:               first valid page frame number to put the object
+ * @lpfn:               last valid page frame number to put the object
+ * @num_placement:      number of prefered placements
+ * @placement:          prefered placements
+ * @num_busy_placement: number of prefered placements when need to evict buffer
+ * @busy_placement:     prefered placements when need to evict buffer
+ *
+ * Structure indicating the placement you request for an object.
+ */
+struct ttm_placement {
+        unsigned        fpfn;
+        unsigned        lpfn;
+        unsigned        num_placement;
+        const uint32_t  *placement;
+        unsigned        num_busy_placement;
+        const uint32_t  *busy_placement;
+};
+
+
 /**
  * struct ttm_mem_reg
  *
@@ -109,10 +132,6 @@ struct ttm_tt;
  * the object is destroyed.
  * @event_queue: Queue for processes waiting on buffer object status change.
  * @lock: spinlock protecting mostly synchronization members.
- * @proposed_placement: Proposed placement for the buffer. Changed only by the
- * creator prior to validation as opposed to bo->mem.proposed_flags which is
- * changed by the implementation prior to a buffer move if it wants to outsmart
- * the buffer creator / user. This latter happens, for example, at eviction.
  * @mem: structure describing current placement.
  * @persistant_swap_storage: Usually the swap storage is deleted for buffers
  * pinned in physical memory. If this behaviour is not desired, this member
@@ -177,7 +196,6 @@ struct ttm_buffer_object {
          * Members protected by the bo::reserved lock.
          */
 
-        uint32_t proposed_placement;
         struct ttm_mem_reg mem;
         struct file *persistant_swap_storage;
         struct ttm_tt *ttm;
@@ -293,21 +311,22 @@ extern int ttm_bo_wait(struct ttm_buffer_object *bo, bool lazy,
  * ttm_buffer_object_validate
  *
  * @bo: The buffer object.
- * @proposed_placement: Proposed_placement for the buffer object.
+ * @placement: Proposed placement for the buffer object.
  * @interruptible: Sleep interruptible if sleeping.
  * @no_wait: Return immediately if the buffer is busy.
  *
  * Changes placement and caching policy of the buffer object
- * according to bo::proposed_flags.
+ * according proposed placement.
  * Returns
- * -EINVAL on invalid proposed_flags.
+ * -EINVAL on invalid proposed placement.
  * -ENOMEM on out-of-memory condition.
  * -EBUSY if no_wait is true and buffer busy.
  * -ERESTART if interrupted by a signal.
  */
 extern int ttm_buffer_object_validate(struct ttm_buffer_object *bo,
-                                      uint32_t proposed_placement,
-                                      bool interruptible, bool no_wait);
+                                        struct ttm_placement *placement,
+                                        bool interruptible, bool no_wait);
+
 /**
  * ttm_bo_unref
  *
@@ -445,7 +464,6 @@ extern int ttm_bo_check_placement(struct ttm_buffer_object *bo,
  *
  * @bdev: Pointer to a ttm_bo_device struct.
  * @mem_type: The memory type.
- * @p_offset: offset for managed area in pages.
  * @p_size: size managed area in pages.
  *
  * Initialize a manager for a given memory type.
@@ -458,7 +476,7 @@ extern int ttm_bo_check_placement(struct ttm_buffer_object *bo,
  */
 
 extern int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
-                          unsigned long p_offset, unsigned long p_size);
+                                unsigned long p_size);
 /**
  * ttm_bo_clean_mm
  *
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 7a39ab9aa1d1..fa5c9e51ee7e 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -242,12 +242,6 @@ struct ttm_mem_type_manager {
 /**
  * struct ttm_bo_driver
  *
- * @mem_type_prio: Priority array of memory types to place a buffer object in
- * if it fits without evicting buffers from any of these memory types.
- * @mem_busy_prio: Priority array of memory types to place a buffer object in
- * if it needs to evict buffers to make room.
- * @num_mem_type_prio: Number of elements in the @mem_type_prio array.
- * @num_mem_busy_prio: Number of elements in the @num_mem_busy_prio array.
  * @create_ttm_backend_entry: Callback to create a struct ttm_backend.
  * @invalidate_caches: Callback to invalidate read caches when a buffer object
  * has been evicted.
@@ -265,11 +259,6 @@ struct ttm_mem_type_manager {
  */
 
 struct ttm_bo_driver {
-        const uint32_t *mem_type_prio;
-        const uint32_t *mem_busy_prio;
-        uint32_t num_mem_type_prio;
-        uint32_t num_mem_busy_prio;
-
         /**
          * struct ttm_bo_driver member create_ttm_backend_entry
          *
@@ -306,7 +295,8 @@ struct ttm_bo_driver {
          * finished, they'll end up in bo->mem.flags
          */
 
-         uint32_t(*evict_flags) (struct ttm_buffer_object *bo);
+         void(*evict_flags) (struct ttm_buffer_object *bo,
+                                struct ttm_placement *placement);
         /**
          * struct ttm_bo_driver member move:
          *
@@ -651,9 +641,9 @@ extern bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev,
  * -ERESTART: An interruptible sleep was interrupted by a signal.
  */
 extern int ttm_bo_mem_space(struct ttm_buffer_object *bo,
-                            uint32_t proposed_placement,
-                            struct ttm_mem_reg *mem,
-                            bool interruptible, bool no_wait);
+                                struct ttm_placement *placement,
+                                struct ttm_mem_reg *mem,
+                                bool interruptible, bool no_wait);
 /**
  * ttm_bo_wait_for_cpu
  *