On Fri, 18 Sep 2020 at 14:25, Daniel Vetter <daniel.vetter@xxxxxxxx> wrote:
>
> The big change is device_add so that device_del can auto-cleanup
> devres resources. This allows us to use devm_drm_dev_alloc, which
> removes the last user of drm_dev_init.
>
> v2: Rebased
>
> v3: use devres_open/release_group so we can use devm without real
> hacks in the driver core or having to create an entire fake bus for
> testing drivers. Might want to extract this into helpers eventually,
> maybe as a mock_drm_dev_alloc or test_drm_dev_alloc.
>
> v4:
> - Fix IS_ERR handling (Matt)
> - Delete surplus put_device() in mock_device_release (intel-gfx-ci)
>
> Cc: Matthew Auld <matthew.william.auld@xxxxxxxxx>
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> (v3)
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> ---
> .../gpu/drm/i915/selftests/mock_gem_device.c | 44 +++++++++++--------
> 1 file changed, 25 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> index ac600d395c8f..816f9af15fb3 100644
> --- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> +++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> @@ -79,8 +79,6 @@ static void mock_device_release(struct drm_device *dev)
>
> out:
> i915_params_free(&i915->params);
> - put_device(&i915->drm.pdev->dev);
> - i915->drm.pdev = NULL;
> }
>
> static struct drm_driver mock_driver = {
> @@ -128,12 +126,6 @@ struct drm_i915_private *mock_gem_device(void)
> pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
> if (!pdev)
> return NULL;
> - i915 = kzalloc(sizeof(*i915), GFP_KERNEL);
> - if (!i915) {
> - kfree(pdev);
> - return NULL;
> - }
> -
> device_initialize(&pdev->dev);
> pdev->class = PCI_BASE_CLASS_DISPLAY << 16;
> pdev->dev.release = release_dev;
> @@ -144,8 +136,29 @@ struct drm_i915_private *mock_gem_device(void)
> /* HACK to disable iommu for the fake device; force identity mapping */
> pdev->dev.iommu = &fake_iommu;
> #endif
> + err = device_add(&pdev->dev);
> + if (err) {
> + kfree(pdev);
> + return NULL;
> + }
> +
> + if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
> + device_del(&pdev->dev);
> + return NULL;
> + }
> +
> + i915 = devm_drm_dev_alloc(&pdev->dev, &mock_driver,
> + struct drm_i915_private, drm);
> + if (IS_ERR(i915)) {
> + pr_err("Failed to allocate mock GEM device: err=%d\n", err);
err = PTR_ERR(i915)
Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
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