Re: [PATCH] drm/i915/gem: Fix the mman selftest

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On 8/31/21 11:45 AM, Maarten Lankhorst wrote:
Op 26-08-2021 om 09:24 schreef Thomas Hellström:
Using the I915_MMAP_TYPE_FIXED mmap type requires the TTM backend, so
for that mmap type, use __i915_gem_object_create_user() instead of
i915_gem_object_create_internal(), as we really want to tests objects
mmap-able by user-space.

This also means that the out-of-space error happens at object creation
and returns -ENXIO rather than -ENOSPC, so fix the code up to expect
that on out-of-offset-space errors.

Finally only use I915_MMAP_TYPE_FIXED for LMEM and SMEM for now if
testing on LMEM-capable devices. For stolen LMEM, we still take the
same path as for integrated, as that haven't been moved over to TTM yet,
and user-space should not be able to create out of stolen LMEM anyway.

Fixes: 7961c5b60f23 ("drm/i915: Add TTM offset argument to mmap.")
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Signed-off-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
---
  .../drm/i915/gem/selftests/i915_gem_mman.c    | 26 +++++++++++++++----
  1 file changed, 21 insertions(+), 5 deletions(-)

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 b20f5621f62b..68da25e66b69 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
@@ -581,6 +581,20 @@ static enum i915_mmap_type default_mapping(struct drm_i915_private *i915)
  	return I915_MMAP_TYPE_GTT;
  }
+static struct drm_i915_gem_object *
+create_sys_or_internal(struct drm_i915_private *i915,
+		       unsigned long size)
+{
+	if (HAS_LMEM(i915)) {
+		struct intel_memory_region *sys_region =
+			i915->mm.regions[INTEL_REGION_SMEM];
+
+		return __i915_gem_object_create_user(i915, size, &sys_region, 1);
+	}
+
+	return i915_gem_object_create_internal(i915, size);
+}
+
  static bool assert_mmap_offset(struct drm_i915_private *i915,
  			       unsigned long size,
  			       int expected)
@@ -589,7 +603,7 @@ static bool assert_mmap_offset(struct drm_i915_private *i915,
  	u64 offset;
  	int ret;
- obj = i915_gem_object_create_internal(i915, size);
+	obj = create_sys_or_internal(i915, size);
  	if (IS_ERR(obj))
  		return expected && expected == PTR_ERR(obj);
@@ -633,6 +647,7 @@ static int igt_mmap_offset_exhaustion(void *arg)
  	struct drm_mm_node *hole, *next;
  	int loop, err = 0;
  	u64 offset;
+	int enospc = HAS_LMEM(i915) ? -ENXIO : -ENOSPC;
/* Disable background reaper */
  	disable_retire_worker(i915);
@@ -683,14 +698,14 @@ static int igt_mmap_offset_exhaustion(void *arg)
  	}
/* Too large */
-	if (!assert_mmap_offset(i915, 2 * PAGE_SIZE, -ENOSPC)) {
+	if (!assert_mmap_offset(i915, 2 * PAGE_SIZE, enospc)) {
  		pr_err("Unexpectedly succeeded in inserting too large object into single page hole\n");
  		err = -EINVAL;
  		goto out;
  	}
/* Fill the hole, further allocation attempts should then fail */
-	obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
+	obj = create_sys_or_internal(i915, PAGE_SIZE);
  	if (IS_ERR(obj)) {
  		err = PTR_ERR(obj);
  		pr_err("Unable to create object for reclaimed hole\n");
@@ -703,7 +718,7 @@ static int igt_mmap_offset_exhaustion(void *arg)
  		goto err_obj;
  	}
- if (!assert_mmap_offset(i915, PAGE_SIZE, -ENOSPC)) {
+	if (!assert_mmap_offset(i915, PAGE_SIZE, enospc)) {
  		pr_err("Unexpectedly succeeded in inserting object into no holes!\n");
  		err = -EINVAL;
  		goto err_obj;
@@ -842,7 +857,8 @@ static bool can_mmap(struct drm_i915_gem_object *obj, enum i915_mmap_type type)
  	struct drm_i915_private *i915 = to_i915(obj->base.dev);
  	bool no_map;
- if (HAS_LMEM(i915))
+	if (HAS_LMEM(i915) && (obj->mm.region->id == INTEL_REGION_SMEM ||
+			       obj->mm.region->id == INTEL_REGION_LMEM))
Ooh just noticed, make the whole line "if (obj->ops->mmap_offset)" instead to match i915_gem_mman.c?

Ah, right. I'll fix that up.

/Thomas


Otherwise looks good.

Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>

  		return type == I915_MMAP_TYPE_FIXED;
  	else if (type == I915_MMAP_TYPE_FIXED)
  		return false;




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