linux-kernel - Re: [PATCH v2] drm/vmgfx: Use non-hybrid PCI devres API

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Message-ID: <e40cf04283e281e2d4a912ff75bce3c6cb8bcf97.camel@mailbox.org>
Date: Thu, 08 May 2025 12:40:44 +0200
From: Philipp Stanner <phasta@...lbox.org>
To: Philipp Stanner <phasta@...nel.org>, Zack Rusin
 <zack.rusin@...adcom.com>,  Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/vmgfx: Use non-hybrid PCI devres API

On Wed, 2025-04-23 at 14:06 +0200, Philipp Stanner wrote:
> vmgfx enables its PCI device with pcim_enable_device(). This,
> implicitly, switches the function pci_request_regions() into managed
> mode, where it becomes a devres function.
> 
> The PCI subsystem wants to remove this hybrid nature from its
> interfaces. To do so, users of the aforementioned combination of
> functions must be ported to non-hybrid functions.
> 
> Moreover, since both functions are already managed in this driver,
> the
> calls to pci_release_regions() are unnecessary.
> 
> Remove the calls to pci_release_regions().
> 
> Replace the call to sometimes-managed pci_request_regions() with one
> to
> the always-managed pcim_request_all_regions().
> 
> Signed-off-by: Philipp Stanner <phasta@...nel.org>

*PING*

> ---
> Changes in v2:
>   - Fix unused variable error.
> ---
>  drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 14 +++-----------
>  1 file changed, 3 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> index 0f32471c8533..1e3ebace32ae 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> @@ -733,7 +733,7 @@ static int vmw_setup_pci_resources(struct
> vmw_private *dev,
>  
>  	pci_set_master(pdev);
>  
> -	ret = pci_request_regions(pdev, "vmwgfx probe");
> +	ret = pcim_request_all_regions(pdev, "vmwgfx probe");
>  	if (ret)
>  		return ret;
>  
> @@ -753,7 +753,6 @@ static int vmw_setup_pci_resources(struct
> vmw_private *dev,
>  		if (!dev->rmmio) {
>  			drm_err(&dev->drm,
>  				"Failed mapping registers mmio
> memory.\n");
> -			pci_release_regions(pdev);
>  			return -ENOMEM;
>  		}
>  	} else if (pci_id == VMWGFX_PCI_ID_SVGA2) {
> @@ -774,11 +773,9 @@ static int vmw_setup_pci_resources(struct
> vmw_private *dev,
>  		if (IS_ERR(dev->fifo_mem)) {
>  			drm_err(&dev->drm,
>  				  "Failed mapping FIFO memory.\n");
> -			pci_release_regions(pdev);
>  			return PTR_ERR(dev->fifo_mem);
>  		}
>  	} else {
> -		pci_release_regions(pdev);
>  		return -EINVAL;
>  	}
>  
> @@ -856,7 +853,6 @@ static int vmw_driver_load(struct vmw_private
> *dev_priv, u32 pci_id)
>  	int ret;
>  	enum vmw_res_type i;
>  	bool refuse_dma = false;
> -	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
>  
>  	vmw_sw_context_init(dev_priv);
>  
> @@ -872,7 +868,7 @@ static int vmw_driver_load(struct vmw_private
> *dev_priv, u32 pci_id)
>  		return ret;
>  	ret = vmw_detect_version(dev_priv);
>  	if (ret)
> -		goto out_no_pci_or_version;
> +		return ret;
>  
>  
>  	for (i = vmw_res_context; i < vmw_res_max; ++i) {
> @@ -1172,15 +1168,13 @@ static int vmw_driver_load(struct vmw_private
> *dev_priv, u32 pci_id)
>  
>  	if (dev_priv->ctx.staged_bindings)
>  		vmw_binding_state_free(dev_priv-
> >ctx.staged_bindings);
> -out_no_pci_or_version:
> -	pci_release_regions(pdev);
> +
>  	return ret;
>  }
>  
>  static void vmw_driver_unload(struct drm_device *dev)
>  {
>  	struct vmw_private *dev_priv = vmw_priv(dev);
> -	struct pci_dev *pdev = to_pci_dev(dev->dev);
>  	enum vmw_res_type i;
>  
>  	unregister_pm_notifier(&dev_priv->pm_nb);
> @@ -1216,8 +1210,6 @@ static void vmw_driver_unload(struct drm_device
> *dev)
>  		idr_destroy(&dev_priv->res_idr[i]);
>  
>  	vmw_mksstat_remove_all(dev_priv);
> -
> -	pci_release_regions(pdev);
>  }
>  
>  static void vmw_postclose(struct drm_device *dev,