[PATCH v3 3/4] drm/i915/ttm: add unmap_virtual callback

Matthew Auld
2022-01-06T17:49:43Z

Ensure we call ttm_bo_unmap_virtual when releasing the pages.
Importantly this should now handle the ttm swapping case, and all other
places that already call into i915_ttm_move_notify().

v2: fix up the selftest

Fixes: cf3e3e86d779 ("drm/i915: Use ttm mmap handling for ttm bo's.")
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_mman.c | 3 +++
.../gpu/drm/i915/gem/i915_gem_object_types.h | 1 +
drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 6 ++++++
.../gpu/drm/i915/gem/selftests/i915_gem_mman.c | 18 ++++--------------
4 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index ee5ec0fd4807..5ac2506f4ee8 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -538,6 +538,9 @@ void i915_gem_object_release_mmap_offset(struct drm_i915_gem_object *obj)
{
struct i915_mmap_offset *mmo, *mn;

+ if (obj->ops->unmap_virtual)
+ obj->ops->unmap_virtual(obj);
+
spin_lock(&obj->mmo.lock);
rbtree_postorder_for_each_entry_safe(mmo, mn,
&obj->mmo.offsets, offset) {
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index f9f7e44099fe..4b4829eb16c2 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -67,6 +67,7 @@ struct drm_i915_gem_object_ops {
int (*pwrite)(struct drm_i915_gem_object *obj,
const struct drm_i915_gem_pwrite *arg);
u64 (*mmap_offset)(struct drm_i915_gem_object *obj);
+ void (*unmap_virtual)(struct drm_i915_gem_object *obj);

int (*dmabuf_export)(struct drm_i915_gem_object *obj);

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 8d61d4538a64..1530d9f0bc81 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -950,6 +950,11 @@ static u64 i915_ttm_mmap_offset(struct drm_i915_gem_object *obj)
return drm_vma_node_offset_addr(&obj->base.vma_node);
}

+static void i915_ttm_unmap_virtual(struct drm_i915_gem_object *obj)
+{
+ ttm_bo_unmap_virtual(i915_gem_to_ttm(obj));
+}
+
static const struct drm_i915_gem_object_ops i915_gem_ttm_obj_ops = {
.name = "i915_gem_object_ttm",
.flags = I915_GEM_OBJECT_IS_SHRINKABLE |
@@ -965,6 +970,7 @@ static const struct drm_i915_gem_object_ops i915_gem_ttm_obj_ops = {
.migrate = i915_ttm_migrate,

.mmap_offset = i915_ttm_mmap_offset,
+ .unmap_virtual = i915_ttm_unmap_virtual,
.mmap_ops = &vm_ops_ttm,
};

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
index 743a098facf2..f61356b72b1c 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
@@ -1369,20 +1369,10 @@ static int __igt_mmap_revoke(struct drm_i915_private *i915,
}
}

- if (!obj->ops->mmap_ops) {
- err = check_absent(addr, obj->base.size);
- if (err) {
- pr_err("%s: was not absent\n", obj->mm.region->name);
- goto out_unmap;
- }
- } else {
- /* ttm allows access to evicted regions by design */
-
- err = check_present(addr, obj->base.size);
- if (err) {
- pr_err("%s: was not present\n", obj->mm.region->name);
- goto out_unmap;
- }
+ err = check_absent(addr, obj->base.size);
+ if (err) {
+ pr_err("%s: was not absent\n", obj->mm.region->name);
+ goto out_unmap;
}

out_unmap:
--
2.31.1