Re: [PATCH v2 2/6] drm/ttm: Implement intersect/compatible functions

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On 8/8/2022 5:00 PM, Christian König wrote:


Am 25.07.22 um 13:42 schrieb Arunpravin Paneer Selvam:
Implemented a new intersect and compatible callback functions
to ttm range manager fetching start offset from drm mm range
allocator.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@xxxxxxx>
---
  drivers/gpu/drm/ttm/ttm_range_manager.c | 33 +++++++++++++++++++++++++
  1 file changed, 33 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_range_manager.c b/drivers/gpu/drm/ttm/ttm_range_manager.c
index d91666721dc6..12b8d9b36fe6 100644
--- a/drivers/gpu/drm/ttm/ttm_range_manager.c
+++ b/drivers/gpu/drm/ttm/ttm_range_manager.c
@@ -113,6 +113,37 @@ static void ttm_range_man_free(struct ttm_resource_manager *man,
      kfree(node);
  }
  +static bool ttm_range_man_intersect(struct ttm_resource_manager *man,
+                    struct ttm_resource *res,
+                    const struct ttm_place *place,
+                    size_t size)
+{
+    struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
+    u32 num_pages = PFN_UP(size);
+
+    /* Don't evict BOs outside of the requested placement range */
+    if (place->fpfn >= (node->start + num_pages) ||
+        (place->lpfn && place->lpfn <= node->start))
+        return false;
+
+    return true;
+}
+
+static bool ttm_range_man_compatible(struct ttm_resource_manager *man,
+                     struct ttm_resource *res,
+                     const struct ttm_place *place,
+                     size_t size)
+{
+    struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
+    u32 num_pages = PFN_UP(size);
+
+    if (node->start < place->fpfn ||

This should probably be "<=".
We are checking the false condition here, if node->start == place->fpfn, then the node->start
value is compatible with place->fpfn, therefore, we don't return false.

Thanks,
Arun

Regards,
Christian.

+        (place->lpfn && (node->start + num_pages) > place->lpfn))
+        return false;
+
+    return true;
+}
+
  static void ttm_range_man_debug(struct ttm_resource_manager *man,
                  struct drm_printer *printer)
  {
@@ -126,6 +157,8 @@ static void ttm_range_man_debug(struct ttm_resource_manager *man,   static const struct ttm_resource_manager_func ttm_range_manager_func = {
      .alloc = ttm_range_man_alloc,
      .free = ttm_range_man_free,
+    .intersect = ttm_range_man_intersect,
+    .compatible = ttm_range_man_compatible,
      .debug = ttm_range_man_debug
  };





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