[Intel-gfx] [PATCH 14/23] drm/i915: Attach the pci match data to the device upon creation

[Michal Wajdeczko]

On Tue, 04 Sep 2018 23:57:33 +0200, Chris Wilson  
<chris at chris-wilson.co.uk> wrote:

> Attach our device_info to the our i915 private on creation so that it is
> always available for inspection.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 66 +++++++++++++++++++--------------
>  1 file changed, 38 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c  
> b/drivers/gpu/drm/i915/i915_drv.c
> index 77a4a01ddc08..1dddd2f4f929 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -870,7 +870,6 @@ static void intel_detect_preproduction_hw(struct  
> drm_i915_private *dev_priv)
>  /**
>   * i915_driver_init_early - setup state not requiring device access
>   * @dev_priv: device private
> - * @ent: the matching pci_device_id
>   *
>   * Initialize everything that is a "SW-only" state, that is state not
>   * requiring accessing the device or exposing the driver via kernel  
> internal
> @@ -878,25 +877,13 @@ static void intel_detect_preproduction_hw(struct  
> drm_i915_private *dev_priv)
>   * system memory allocation, setting up device specific attributes and
>   * function hooks not requiring accessing the device.
>   */
> -static int i915_driver_init_early(struct drm_i915_private *dev_priv,
> -				  const struct pci_device_id *ent)
> +static int i915_driver_init_early(struct drm_i915_private *dev_priv)
>  {
> -	const struct intel_device_info *match_info =
> -		(struct intel_device_info *)ent->driver_data;
> -	struct intel_device_info *device_info;
>  	int ret = 0;
> 	if (i915_inject_load_failure())
>  		return -ENODEV;
> -	/* Setup the write-once "constant" device info */
> -	device_info = mkwrite_device_info(dev_priv);
> -	memcpy(device_info, match_info, sizeof(*device_info));
> -	device_info->device_id = dev_priv->drm.pdev->device;
> -
> -	BUILD_BUG_ON(INTEL_MAX_PLATFORMS >
> -		     sizeof(device_info->platform_mask) * BITS_PER_BYTE);
> -	BUG_ON(device_info->gen > sizeof(device_info->gen_mask) *  
> BITS_PER_BYTE);
>  	spin_lock_init(&dev_priv->irq_lock);
>  	spin_lock_init(&dev_priv->gpu_error.lock);
>  	mutex_init(&dev_priv->backlight_lock);
> @@ -1335,6 +1322,39 @@ static void i915_welcome_messages(struct  
> drm_i915_private *dev_priv)
>  		DRM_INFO("DRM_I915_DEBUG_RUNTIME_PM enabled\n");
>  }
> +static struct drm_i915_private *
> +i915_driver_create(struct pci_dev *pdev, const struct pci_device_id  
> *ent)
> +{
> +	const struct intel_device_info *match_info =
> +		(struct intel_device_info *)ent->driver_data;
> +	struct intel_device_info *device_info;
> +	struct drm_i915_private *i915;
> +
> +	i915 = kzalloc(sizeof(*i915), GFP_KERNEL);
> +	if (!i915)
> +		return NULL;
> +
> +	if (drm_dev_init(&i915->drm, &driver, &pdev->dev)) {
> +		kfree(i915);
> +		return NULL;
> +	}
> +
> +	i915->drm.pdev = pdev;
> +	i915->drm.dev_private = i915;
> +	pci_set_drvdata(pdev, &i915->drm);
> +
> +	/* Setup the write-once "constant" device info */
> +	device_info = mkwrite_device_info(i915);
> +	memcpy(device_info, match_info, sizeof(*device_info));
> +	device_info->device_id = pdev->device;
> +
> +	BUILD_BUG_ON(INTEL_MAX_PLATFORMS >
> +		     sizeof(device_info->platform_mask) * BITS_PER_BYTE);
> +	BUG_ON(device_info->gen > sizeof(device_info->gen_mask) *  
> BITS_PER_BYTE);
> +
> +	return i915;
> +}
> +
>  /**
>   * i915_driver_load - setup chip and create an initial config
>   * @pdev: PCI device
> @@ -1357,24 +1377,15 @@ int i915_driver_load(struct pci_dev *pdev, const  
> struct pci_device_id *ent)
>  	if (!i915_modparams.nuclear_pageflip && match_info->gen < 5)
>  		driver.driver_features &= ~DRIVER_ATOMIC;
> -	ret = -ENOMEM;
> -	dev_priv = kzalloc(sizeof(*dev_priv), GFP_KERNEL);
> -	if (dev_priv)
> -		ret = drm_dev_init(&dev_priv->drm, &driver, &pdev->dev);
> -	if (ret) {
> -		DRM_DEV_ERROR(&pdev->dev, "allocation failed\n");
> -		goto out_free;
> -	}
> -
> -	dev_priv->drm.pdev = pdev;
> -	dev_priv->drm.dev_private = dev_priv;
> +	dev_priv = i915_driver_create(pdev, ent);
> +	if (!dev_priv)
> +		return -ENOMEM;
> 	ret = pci_enable_device(pdev);
>  	if (ret)
>  		goto out_fini;
> -	pci_set_drvdata(pdev, &dev_priv->drm);
> -	ret = i915_driver_init_early(dev_priv, ent);
> +	ret = i915_driver_init_early(dev_priv);
>  	if (ret < 0)
>  		goto out_pci_disable;
> @@ -1426,7 +1437,6 @@ int i915_driver_load(struct pci_dev *pdev, const  
> struct pci_device_id *ent)
>  out_fini:
>  	i915_load_error(dev_priv, "Device initialization failed (%d)\n", ret);
>  	drm_dev_fini(&dev_priv->drm);
> -out_free:
>  	kfree(dev_priv);
>  	pci_set_drvdata(pdev, NULL);

I think you want drm_dev_fini, kfree and pci_set_drvdata to be moved to

	void i915_driver_destroy(i915) { ... }

to keep symmetry with just added _create_ function.

with that,

Reviewed-by: Michal Wajdeczko <michal.wajdeczko at intel.com>

>  	return ret;