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Date: Thu, 23 Mar 2023 12:12:01 +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 2/8] pds_vdpa: Add new vDPA driver for
AMD/Pensando DSC
On Thu, Mar 23, 2023 at 3:11 AM Shannon Nelson <shannon.nelson@....com> wrote:
>
> This is the initial auxiliary driver framework for a new vDPA
> device driver, an auxiliary_bus client of the pds_core driver.
> The pds_core driver supplies the PCI services for the VF device
> and for accessing the adminq in the PF device.
>
> This patch adds the very basics of registering for the auxiliary
> device and setting up debugfs entries.
>
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
Acked-by: Jason Wang <jasowang@...hat.com>
Thanks
> ---
> drivers/vdpa/Makefile | 1 +
> drivers/vdpa/pds/Makefile | 8 ++++
> drivers/vdpa/pds/aux_drv.c | 84 ++++++++++++++++++++++++++++++++++++
> drivers/vdpa/pds/aux_drv.h | 15 +++++++
> drivers/vdpa/pds/debugfs.c | 29 +++++++++++++
> drivers/vdpa/pds/debugfs.h | 18 ++++++++
> include/linux/pds/pds_vdpa.h | 10 +++++
> 7 files changed, 165 insertions(+)
> create mode 100644 drivers/vdpa/pds/Makefile
> create mode 100644 drivers/vdpa/pds/aux_drv.c
> create mode 100644 drivers/vdpa/pds/aux_drv.h
> create mode 100644 drivers/vdpa/pds/debugfs.c
> create mode 100644 drivers/vdpa/pds/debugfs.h
> create mode 100644 include/linux/pds/pds_vdpa.h
>
> diff --git a/drivers/vdpa/Makefile b/drivers/vdpa/Makefile
> index 59396ff2a318..8f53c6f3cca7 100644
> --- a/drivers/vdpa/Makefile
> +++ b/drivers/vdpa/Makefile
> @@ -7,3 +7,4 @@ obj-$(CONFIG_MLX5_VDPA) += mlx5/
> obj-$(CONFIG_VP_VDPA) += virtio_pci/
> obj-$(CONFIG_ALIBABA_ENI_VDPA) += alibaba/
> obj-$(CONFIG_SNET_VDPA) += solidrun/
> +obj-$(CONFIG_PDS_VDPA) += pds/
> diff --git a/drivers/vdpa/pds/Makefile b/drivers/vdpa/pds/Makefile
> new file mode 100644
> index 000000000000..a9cd2f450ae1
> --- /dev/null
> +++ b/drivers/vdpa/pds/Makefile
> @@ -0,0 +1,8 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +# Copyright(c) 2023 Advanced Micro Devices, Inc
> +
> +obj-$(CONFIG_PDS_VDPA) := pds_vdpa.o
> +
> +pds_vdpa-y := aux_drv.o
> +
> +pds_vdpa-$(CONFIG_DEBUG_FS) += debugfs.o
> diff --git a/drivers/vdpa/pds/aux_drv.c b/drivers/vdpa/pds/aux_drv.c
> new file mode 100644
> index 000000000000..39c03f067b77
> --- /dev/null
> +++ b/drivers/vdpa/pds/aux_drv.c
> @@ -0,0 +1,84 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc */
> +
> +#include <linux/auxiliary_bus.h>
> +#include <linux/pci.h>
> +
> +#include <linux/pds/pds_common.h>
> +#include <linux/pds/pds_core_if.h>
> +#include <linux/pds/pds_adminq.h>
> +#include <linux/pds/pds_auxbus.h>
> +#include <linux/pds/pds_vdpa.h>
> +
> +#include "aux_drv.h"
> +#include "debugfs.h"
> +
> +static const struct auxiliary_device_id pds_vdpa_id_table[] = {
> + { .name = PDS_VDPA_DEV_NAME, },
> + {},
> +};
> +
> +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 pds_vdpa_aux *vdpa_aux;
> +
> + vdpa_aux = kzalloc(sizeof(*vdpa_aux), GFP_KERNEL);
> + if (!vdpa_aux)
> + return -ENOMEM;
> +
> + vdpa_aux->padev = padev;
> + auxiliary_set_drvdata(aux_dev, vdpa_aux);
> +
> + return 0;
> +}
> +
> +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;
> +
> + kfree(vdpa_aux);
> + auxiliary_set_drvdata(aux_dev, NULL);
> +
> + dev_info(dev, "Removed\n");
> +}
> +
> +static struct auxiliary_driver pds_vdpa_driver = {
> + .name = PDS_DEV_TYPE_VDPA_STR,
> + .probe = pds_vdpa_probe,
> + .remove = pds_vdpa_remove,
> + .id_table = pds_vdpa_id_table,
> +};
> +
> +static void __exit pds_vdpa_cleanup(void)
> +{
> + auxiliary_driver_unregister(&pds_vdpa_driver);
> +
> + pds_vdpa_debugfs_destroy();
> +}
> +module_exit(pds_vdpa_cleanup);
> +
> +static int __init pds_vdpa_init(void)
> +{
> + int err;
> +
> + pds_vdpa_debugfs_create();
> +
> + err = auxiliary_driver_register(&pds_vdpa_driver);
> + if (err) {
> + pr_err("%s: aux driver register failed: %pe\n",
> + PDS_VDPA_DRV_NAME, ERR_PTR(err));
> + pds_vdpa_debugfs_destroy();
> + }
> +
> + return err;
> +}
> +module_init(pds_vdpa_init);
> +
> +MODULE_DESCRIPTION(PDS_VDPA_DRV_DESCRIPTION);
> +MODULE_AUTHOR("Advanced Micro Devices, Inc");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/vdpa/pds/aux_drv.h b/drivers/vdpa/pds/aux_drv.h
> new file mode 100644
> index 000000000000..14e465944dfd
> --- /dev/null
> +++ b/drivers/vdpa/pds/aux_drv.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc */
> +
> +#ifndef _AUX_DRV_H_
> +#define _AUX_DRV_H_
> +
> +#define PDS_VDPA_DRV_DESCRIPTION "AMD/Pensando vDPA VF Device Driver"
> +#define PDS_VDPA_DRV_NAME "pds_vdpa"
> +
> +struct pds_vdpa_aux {
> + struct pds_auxiliary_dev *padev;
> +
> + struct dentry *dentry;
> +};
> +#endif /* _AUX_DRV_H_ */
> diff --git a/drivers/vdpa/pds/debugfs.c b/drivers/vdpa/pds/debugfs.c
> new file mode 100644
> index 000000000000..12e844f96ccc
> --- /dev/null
> +++ b/drivers/vdpa/pds/debugfs.c
> @@ -0,0 +1,29 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc */
> +
> +#include <linux/pci.h>
> +
> +#include <linux/pds/pds_common.h>
> +#include <linux/pds/pds_core_if.h>
> +#include <linux/pds/pds_adminq.h>
> +#include <linux/pds/pds_auxbus.h>
> +
> +#include "aux_drv.h"
> +#include "debugfs.h"
> +
> +#ifdef CONFIG_DEBUG_FS
> +
> +static struct dentry *dbfs_dir;
> +
> +void pds_vdpa_debugfs_create(void)
> +{
> + dbfs_dir = debugfs_create_dir(PDS_VDPA_DRV_NAME, NULL);
> +}
> +
> +void pds_vdpa_debugfs_destroy(void)
> +{
> + debugfs_remove_recursive(dbfs_dir);
> + dbfs_dir = NULL;
> +}
> +
> +#endif /* CONFIG_DEBUG_FS */
> diff --git a/drivers/vdpa/pds/debugfs.h b/drivers/vdpa/pds/debugfs.h
> new file mode 100644
> index 000000000000..fff078a869e5
> --- /dev/null
> +++ b/drivers/vdpa/pds/debugfs.h
> @@ -0,0 +1,18 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc */
> +
> +#ifndef _PDS_VDPA_DEBUGFS_H_
> +#define _PDS_VDPA_DEBUGFS_H_
> +
> +#include <linux/debugfs.h>
> +
> +#ifdef CONFIG_DEBUG_FS
> +
> +void pds_vdpa_debugfs_create(void);
> +void pds_vdpa_debugfs_destroy(void);
> +#else
> +static inline void pds_vdpa_debugfs_create(void) { }
> +static inline void pds_vdpa_debugfs_destroy(void) { }
> +#endif
> +
> +#endif /* _PDS_VDPA_DEBUGFS_H_ */
> diff --git a/include/linux/pds/pds_vdpa.h b/include/linux/pds/pds_vdpa.h
> new file mode 100644
> index 000000000000..d3414536985d
> --- /dev/null
> +++ b/include/linux/pds/pds_vdpa.h
> @@ -0,0 +1,10 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc */
> +
> +#ifndef _PDS_VDPA_H_
> +#define _PDS_VDPA_H_
> +
> +#define PDS_DEV_TYPE_VDPA_STR "vDPA"
> +#define PDS_VDPA_DEV_NAME PDS_CORE_DRV_NAME "." PDS_DEV_TYPE_VDPA_STR
> +
> +#endif /* _PDS_VDPA_H_ */
> --
> 2.17.1
>
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