netdev - Re: [PATCH v3 virtio 4/8] pds_vdpa: virtio bar setup for vdpa

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Date:   Thu, 23 Mar 2023 13:11:38 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Shannon Nelson <shannon.nelson@....com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        brett.creeley@....com, davem@...emloft.net, netdev@...r.kernel.org,
        kuba@...nel.org, drivers@...sando.io
Subject: Re: [PATCH v3 virtio 4/8] pds_vdpa: virtio bar setup for vdpa

On Thu, Mar 23, 2023 at 3:11 AM Shannon Nelson <shannon.nelson@....com> wrote:
>
> Prep and use the "modern" virtio bar utilities to get our
> virtio config space ready.
>
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
> ---
>  drivers/vdpa/pds/aux_drv.c | 25 +++++++++++++++++++++++++
>  drivers/vdpa/pds/aux_drv.h |  3 +++
>  2 files changed, 28 insertions(+)
>
> diff --git a/drivers/vdpa/pds/aux_drv.c b/drivers/vdpa/pds/aux_drv.c
> index 881acd869a9d..8f3ae3326885 100644
> --- a/drivers/vdpa/pds/aux_drv.c
> +++ b/drivers/vdpa/pds/aux_drv.c
> @@ -4,6 +4,7 @@
>  #include <linux/auxiliary_bus.h>
>  #include <linux/pci.h>
>  #include <linux/vdpa.h>
> +#include <linux/virtio_pci_modern.h>
>
>  #include <linux/pds/pds_common.h>
>  #include <linux/pds/pds_core_if.h>
> @@ -20,12 +21,22 @@ static const struct auxiliary_device_id pds_vdpa_id_table[] = {
>         {},
>  };
>
> +static int pds_vdpa_device_id_check(struct pci_dev *pdev)
> +{
> +       if (pdev->device != PCI_DEVICE_ID_PENSANDO_VDPA_VF ||
> +           pdev->vendor != PCI_VENDOR_ID_PENSANDO)
> +               return -ENODEV;

Similar to patch 1, if we don't need to override we probably can
rename the device_id_check_override to device_id_check(). Otherwise
it's better to let this function to return device id.

Thanks

> +
> +       return 0;
> +}
> +
>  static int pds_vdpa_probe(struct auxiliary_device *aux_dev,
>                           const struct auxiliary_device_id *id)
>
>  {
>         struct pds_auxiliary_dev *padev =
>                 container_of(aux_dev, struct pds_auxiliary_dev, aux_dev);
> +       struct device *dev = &aux_dev->dev;
>         struct pds_vdpa_aux *vdpa_aux;
>         int err;
>
> @@ -42,8 +53,21 @@ static int pds_vdpa_probe(struct auxiliary_device *aux_dev,
>         if (err)
>                 goto err_free_mem;
>
> +       /* Find the virtio configuration */
> +       vdpa_aux->vd_mdev.pci_dev = padev->vf_pdev;
> +       vdpa_aux->vd_mdev.device_id_check_override = pds_vdpa_device_id_check;
> +       vdpa_aux->vd_mdev.dma_mask_override = DMA_BIT_MASK(PDS_CORE_ADDR_LEN);
> +       err = vp_modern_probe(&vdpa_aux->vd_mdev);
> +       if (err) {
> +               dev_err(dev, "Unable to probe for virtio configuration: %pe\n",
> +                       ERR_PTR(err));
> +               goto err_free_mgmt_info;
> +       }
> +
>         return 0;
>
> +err_free_mgmt_info:
> +       pci_free_irq_vectors(padev->vf_pdev);
>  err_free_mem:
>         kfree(vdpa_aux);
>         auxiliary_set_drvdata(aux_dev, NULL);
> @@ -56,6 +80,7 @@ static void pds_vdpa_remove(struct auxiliary_device *aux_dev)
>         struct pds_vdpa_aux *vdpa_aux = auxiliary_get_drvdata(aux_dev);
>         struct device *dev = &aux_dev->dev;
>
> +       vp_modern_remove(&vdpa_aux->vd_mdev);
>         pci_free_irq_vectors(vdpa_aux->padev->vf_pdev);
>
>         kfree(vdpa_aux);
> diff --git a/drivers/vdpa/pds/aux_drv.h b/drivers/vdpa/pds/aux_drv.h
> index 94ba7abcaa43..8f5140401573 100644
> --- a/drivers/vdpa/pds/aux_drv.h
> +++ b/drivers/vdpa/pds/aux_drv.h
> @@ -4,6 +4,8 @@
>  #ifndef _AUX_DRV_H_
>  #define _AUX_DRV_H_
>
> +#include <linux/virtio_pci_modern.h>
> +
>  #define PDS_VDPA_DRV_DESCRIPTION    "AMD/Pensando vDPA VF Device Driver"
>  #define PDS_VDPA_DRV_NAME           "pds_vdpa"
>
> @@ -16,6 +18,7 @@ struct pds_vdpa_aux {
>
>         int vf_id;
>         struct dentry *dentry;
> +       struct virtio_pci_modern_device vd_mdev;
>
>         int nintrs;
>  };
> --
> 2.17.1
>