Re: [Intel-gfx] [PATCH 5/9] drm/i915: split i915_driver_modeset_probe() to pre/post irq install

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Feb 04, 2020 at 03:42:24PM +0200, Jani Nikula wrote:
> Pair the irq install and uninstall in the same layer. There are no
> functional changes in the happy day scenario. The cleanup paths are
> currently a mess though.
> 
> Note that modeset probe pre-irq + post-irq install are matched by
> modeset driver remove pre-irq + post-irq uninstall, together, but not
> independently. They are not symmetric pairs.
> 
> v2: don't add a new probe failure point here
> 
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 40 ++++++++++++++++++++++-----------
>  1 file changed, 27 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 2ef4b8fc5f4c..1243638506bc 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -272,7 +272,8 @@ intel_teardown_mchbar(struct drm_i915_private *dev_priv)
>  		release_resource(&dev_priv->mch_res);
>  }
>  
> -static int i915_driver_modeset_probe(struct drm_i915_private *i915)
> +/* part #1: call before irq install */
> +static int i915_driver_modeset_probe_noirq(struct drm_i915_private *i915)
>  {
>  	int ret;
>  
> @@ -296,15 +297,22 @@ static int i915_driver_modeset_probe(struct drm_i915_private *i915)
>  
>  	intel_csr_ucode_init(i915);
>  
> -	ret = intel_irq_install(i915);
> -	if (ret)
> -		goto cleanup_csr;
> +	return 0;
> +
> +out:
> +	return ret;
> +}
> +
> +/* part #2: call after irq install */
> +static int i915_driver_modeset_probe(struct drm_i915_private *i915)
> +{
> +	int ret;
>  
>  	/* Important: The output setup functions called by modeset_init need
>  	 * working irqs for e.g. gmbus and dp aux transfers. */
>  	ret = intel_modeset_init(i915);
>  	if (ret)
> -		goto cleanup_irq;
> +		goto out;
>  
>  	ret = i915_gem_init(i915);
>  	if (ret)
> @@ -331,16 +339,10 @@ static int i915_driver_modeset_probe(struct drm_i915_private *i915)
>  	i915_gem_driver_remove(i915);
>  	i915_gem_driver_release(i915);
>  cleanup_modeset:
> +	/* FIXME */
>  	intel_modeset_driver_remove(i915);
>  	intel_irq_uninstall(i915);
>  	intel_modeset_driver_remove_noirq(i915);
> -	goto cleanup_csr;
> -cleanup_irq:
> -	intel_irq_uninstall(i915);
> -cleanup_csr:
> -	intel_csr_ucode_fini(i915);
> -	intel_power_domains_driver_remove(i915);
> -	intel_vga_unregister(i915);
>  out:
>  	return ret;
>  }
> @@ -1541,10 +1543,18 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	if (ret < 0)
>  		goto out_cleanup_mmio;
>  
> -	ret = i915_driver_modeset_probe(i915);
> +	ret = i915_driver_modeset_probe_noirq(i915);
>  	if (ret < 0)
>  		goto out_cleanup_hw;
>  
> +	ret = intel_irq_install(i915);
> +	if (ret)
> +		goto out_cleanup_modeset;
> +
> +	ret = i915_driver_modeset_probe(i915);
> +	if (ret < 0)
> +		goto out_cleanup_irq;
> +
>  	i915_driver_register(i915);
>  
>  	enable_rpm_wakeref_asserts(&i915->runtime_pm);
> @@ -1553,6 +1563,10 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  
>  	return 0;
>  
> +out_cleanup_irq:
> +	intel_irq_uninstall(i915);
> +out_cleanup_modeset:
> +	/* FIXME */

Waiting for a mysterious cleanup_noirq() I guess.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

>  out_cleanup_hw:
>  	i915_driver_hw_remove(i915);
>  	intel_memory_regions_driver_release(i915);
> -- 
> 2.20.1

-- 
Ville Syrjälä
Intel
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