linux-kernel - Re: [PATCH V5 2/3] PCI: vmd: Add vmd_device

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Message-ID: <366a9602-555f-7a1b-a8db-bbcbf84b7b08@linux.dev>
Date:   Fri, 18 Feb 2022 14:19:20 -0700
From:   Jonathan Derrick <jonathan.derrick@...ux.dev>
To:     "David E. Box" <david.e.box@...ux.intel.com>,
        nirmal.patel@...ux.intel.com, lorenzo.pieralisi@....com,
        hch@...radead.org, kw@...ux.com, robh@...nel.org,
        bhelgaas@...gle.com, michael.a.bottini@...ux.intel.com,
        rafael@...nel.org, me@...ityamohan.in
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 2/3] PCI: vmd: Add vmd_device_data

Hi David,

On 2/17/2022 9:50 PM, David E. Box wrote:
> Add vmd_device_data to allow adding additional info for driver data. Also
> refactor the PCI ID list to use PCI_VDEVICE and simplify assignments for
> devices that use the same driver_data.
> 
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> ---
> 
> V5
>    - New patch
> 
>   drivers/pci/controller/vmd.c | 58 ++++++++++++++++++++----------------
>   1 file changed, 32 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
> index cc166c683638..a582c351b461 100644
> --- a/drivers/pci/controller/vmd.c
> +++ b/drivers/pci/controller/vmd.c
> @@ -69,6 +69,10 @@ enum vmd_features {
>   	VMD_FEAT_CAN_BYPASS_MSI_REMAP		= (1 << 4),
>   };
>   
> +struct vmd_device_data {
> +	enum vmd_features features;
> +};
> +
>   static DEFINE_IDA(vmd_instance_ida);
>   
>   /*
> @@ -710,11 +714,12 @@ static void vmd_copy_host_bridge_flags(struct pci_host_bridge *root_bridge,
>   	vmd_bridge->native_dpc = root_bridge->native_dpc;
>   }
>   
> -static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
> +static int vmd_enable_domain(struct vmd_dev *vmd, struct vmd_device_data *info)
>   {
>   	struct pci_sysdata *sd = &vmd->sysdata;
>   	struct resource *res;
>   	u32 upper_bits;
> +	unsigned long features = info->features;
>   	unsigned long flags;
>   	LIST_HEAD(resources);
>   	resource_size_t offset[2] = {0};
> @@ -881,7 +886,8 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
>   
>   static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
>   {
> -	unsigned long features = (unsigned long) id->driver_data;
> +	struct vmd_device_data *info = (struct vmd_device_data *)id->driver_data;
> +	unsigned long features = info->features;
>   	struct vmd_dev *vmd;
>   	int err;
>   
> @@ -925,7 +931,7 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
>   
>   	spin_lock_init(&vmd->cfg_lock);
>   	pci_set_drvdata(dev, vmd);
> -	err = vmd_enable_domain(vmd, features);
> +	err = vmd_enable_domain(vmd, info);
>   	if (err)
>   		goto out_release_instance;
>   
> @@ -993,30 +999,30 @@ static int vmd_resume(struct device *dev)
>   #endif
>   static SIMPLE_DEV_PM_OPS(vmd_dev_pm_ops, vmd_suspend, vmd_resume);
>   
> +static const struct vmd_device_data vmd_201d_data = {
> +	.features = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP,
> +};
> +
> +static const struct vmd_device_data vmd_28c0_data = {
> +	.features = VMD_FEAT_HAS_MEMBAR_SHADOW |
> +		    VMD_FEAT_HAS_BUS_RESTRICTIONS |
> +		    VMD_FEAT_CAN_BYPASS_MSI_REMAP,
> +};
> +
> +static const struct vmd_device_data vmd_467f_data = {
> +	.features = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP |
> +		    VMD_FEAT_HAS_BUS_RESTRICTIONS |
> +		    VMD_FEAT_OFFSET_FIRST_VECTOR,
> +};
> +

I'm not the biggest fan of this structure
Can you inline the declarations into the vmd_ids table below?



>   static const struct pci_device_id vmd_ids[] = {
> -	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_201D),
> -		.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP,},
> -	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_28C0),
> -		.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW |
> -				VMD_FEAT_HAS_BUS_RESTRICTIONS |
> -				VMD_FEAT_CAN_BYPASS_MSI_REMAP,},
> -	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x467f),
> -		.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP |
> -				VMD_FEAT_HAS_BUS_RESTRICTIONS |
> -				VMD_FEAT_OFFSET_FIRST_VECTOR,},
> -	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x4c3d),
> -		.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP |
> -				VMD_FEAT_HAS_BUS_RESTRICTIONS |
> -				VMD_FEAT_OFFSET_FIRST_VECTOR,},
> -	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xa77f),
> -		.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP |
> -				VMD_FEAT_HAS_BUS_RESTRICTIONS |
> -				VMD_FEAT_OFFSET_FIRST_VECTOR,},
> -	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_9A0B),
> -		.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP |
> -				VMD_FEAT_HAS_BUS_RESTRICTIONS |
> -				VMD_FEAT_OFFSET_FIRST_VECTOR,},
> -	{0,}
> +	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_VMD_201D), (kernel_ulong_t)&vmd_201d_data },
> +	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_VMD_28C0), (kernel_ulong_t)&vmd_28c0_data },
> +	{ PCI_VDEVICE(INTEL, 0x467f), (kernel_ulong_t)&vmd_467f_data },
> +	{ PCI_VDEVICE(INTEL, 0x4c3d), (kernel_ulong_t)&vmd_467f_data },
> +	{ PCI_VDEVICE(INTEL, 0xa77f), (kernel_ulong_t)&vmd_467f_data },
> +	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_VMD_9A0B), (kernel_ulong_t)&vmd_467f_data },
> +	{ }

For instance:
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_VMD_201D), (kernel_ulong_t)&(struct vmd_device_data) {
							.features = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP,


>   };
>   MODULE_DEVICE_TABLE(pci, vmd_ids);
>