linux-kernel - Re: [PATCH V2 03/13] platform/x86/intel/vsec: Add intel_vsec

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Message-ID: <3ae9ceaf-21f9-96c5-89a7-118e4c7340f8@linux.intel.com>
Date:   Wed, 4 Oct 2023 10:44:23 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     "David E. Box" <david.e.box@...ux.intel.com>
cc:     LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org, rajvi.jingar@...ux.intel.com
Subject: Re: [PATCH V2 03/13] platform/x86/intel/vsec: Add
 intel_vsec_register

On Tue, 3 Oct 2023, David E. Box wrote:

> From: Gayatri Kammela <gayatri.kammela@...ux.intel.com>
> 
> Add and export intel_vsec_register() to allow the registration of Intel
> extended capabilities from other drivers. Add check to look for memory
> conflicts before registering a new capability. Add a parent field to
> intel_vsec_platform_info to allow specifying the parent device for
> device managed cleanup.
> 
> Signed-off-by: Gayatri Kammela <gayatri.kammela@...ux.intel.com>
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> ---
> V2 - New patch splitting previous PATCH 1
> 
>  drivers/platform/x86/intel/vsec.c | 21 ++++++++++++++++++++-
>  drivers/platform/x86/intel/vsec.h |  4 ++++
>  2 files changed, 24 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
> index b14eba545770..c5d0202068cf 100644
> --- a/drivers/platform/x86/intel/vsec.c
> +++ b/drivers/platform/x86/intel/vsec.c
> @@ -188,6 +188,15 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
>  			     header->offset + i * (header->entry_size * sizeof(u32));
>  		tmp->end = tmp->start + (header->entry_size * sizeof(u32)) - 1;
>  		tmp->flags = IORESOURCE_MEM;
> +
> +		/* Check resource is not in use */
> +		if (!request_mem_region(tmp->start, resource_size(tmp), "")) {
> +			kfree(res);
> +			kfree(intel_vsec_dev);
> +			return -EBUSY;

Convert this function to do proper rollback as there's already
kfree(intel_vsec_dev) above this one, or better yet, use the new cleanup 
thing if you know how to use it.

-- 
 i.


> +		}
> +
> +		release_mem_region(tmp->start, resource_size(tmp));
>  	}
>  
>  	intel_vsec_dev->pcidev = pdev;
> @@ -200,7 +209,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
>  	else
>  		intel_vsec_dev->ida = &intel_vsec_ida;
>  
> -	return intel_vsec_add_aux(pdev, NULL, intel_vsec_dev,
> +	return intel_vsec_add_aux(pdev, info->parent, intel_vsec_dev,
>  				  intel_vsec_name(header->id));
>  }
>  
> @@ -318,6 +327,16 @@ static bool intel_vsec_walk_vsec(struct pci_dev *pdev,
>  	return have_devices;
>  }
>  
> +void intel_vsec_register(struct pci_dev *pdev,
> +			 struct intel_vsec_platform_info *info)
> +{
> +	if (!pdev || !info)
> +		return;
> +
> +	intel_vsec_walk_header(pdev, info);
> +}
> +EXPORT_SYMBOL_NS_GPL(intel_vsec_register, INTEL_VSEC);
> +
>  static int intel_vsec_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  {
>  	struct intel_vsec_platform_info *info;
> diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
> index d3fefba3e623..a15fda2fcd28 100644
> --- a/drivers/platform/x86/intel/vsec.h
> +++ b/drivers/platform/x86/intel/vsec.h
> @@ -69,6 +69,7 @@ enum intel_vsec_quirks {
>  
>  /* Platform specific data */
>  struct intel_vsec_platform_info {
> +	struct device *parent;
>  	struct intel_vsec_header **headers;
>  	unsigned long caps;
>  	unsigned long quirks;
> @@ -98,4 +99,7 @@ static inline struct intel_vsec_device *auxdev_to_ivdev(struct auxiliary_device
>  {
>  	return container_of(auxdev, struct intel_vsec_device, auxdev);
>  }
> +
> +void intel_vsec_register(struct pci_dev *pdev,
> +			 struct intel_vsec_platform_info *info);
>  #endif
>