Re: [PATCH V5 2/3] PCI: vmd: Add vmd_device_data

Jonathan Derrick
2022-02-18T21:19:50Z

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@linux.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);
>