Re: [PATCH v2 1/5] drm/i915/gem: Implement object migration

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On 6/28/21 11:09 AM, Thomas Hellström wrote:
Introduce an interface to migrate objects between regions.
This is primarily intended to migrate objects to LMEM for display and
to SYSTEM for dma-buf, but might be reused in one form or another for
performande-based migration.

v2:
- Verify that the memory region given as an id really exists.
   (Reported by Matthew Auld)
- Call i915_gem_object_{init,release}_memory_region() when switching region
   to handle also switching region lists. (Reported by Matthew Auld)

Signed-off-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
---
  drivers/gpu/drm/i915/gem/i915_gem_object.c    | 96 +++++++++++++++++++
  drivers/gpu/drm/i915/gem/i915_gem_object.h    | 12 +++
  .../gpu/drm/i915/gem/i915_gem_object_types.h  |  9 ++
  drivers/gpu/drm/i915/gem/i915_gem_ttm.c       | 69 +++++++++----
  drivers/gpu/drm/i915/gem/i915_gem_wait.c      | 19 ++++
  5 files changed, 188 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index 07e8ff9a8aae..52a37619054d 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -513,6 +513,102 @@ bool i915_gem_object_has_iomem(const struct drm_i915_gem_object *obj)
  	return obj->mem_flags & I915_BO_FLAG_IOMEM;
  }
+/**
+ * i915_gem_object_can_migrate - Whether an object likely can be migrated
+ *
+ * @obj: The object to migrate
+ * @id: The region intended to migrate to
+ *
+ * Check whether the object backend supports migration to the
+ * given region. Note that pinning may affect the ability to migrate.
+ *
+ * Return: true if migration is possible, false otherwise.
+ */
+bool i915_gem_object_can_migrate(struct drm_i915_gem_object *obj,
+				 enum intel_region_id id)
+{
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	unsigned int num_allowed = obj->mm.n_placements;
+	struct intel_memory_region *mr;
+	unsigned int i;
+
+	GEM_BUG_ON(id >= INTEL_REGION_UNKNOWN);
+	GEM_BUG_ON(obj->mm.madv != I915_MADV_WILLNEED);
+
+	if (!obj->ops->migrate)
+		return false;
+
+	mr = i915->mm.regions[id];
+	if (!mr)
+		return false;


Hmm. Should probably switch order between these two, otherwise can_migrate will always return false on !TTM

/Thomas


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