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Message-ID: <67192b9598d041568ece62ea282367d0@huawei.com>
Date: Thu, 15 Jun 2023 21:05:26 +0000
From: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To: Brett Creeley <brett.creeley@....com>, "kvm@...r.kernel.org"
<kvm@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"alex.williamson@...hat.com" <alex.williamson@...hat.com>, "jgg@...dia.com"
<jgg@...dia.com>, "yishaih@...dia.com" <yishaih@...dia.com>,
"kevin.tian@...el.com" <kevin.tian@...el.com>
CC: "shannon.nelson@....com" <shannon.nelson@....com>
Subject: RE: [PATCH v10 vfio 3/7] vfio/pds: register with the pds_core PF
> -----Original Message-----
> From: Brett Creeley [mailto:brett.creeley@....com]
> Sent: 02 June 2023 23:03
> To: kvm@...r.kernel.org; netdev@...r.kernel.org;
> alex.williamson@...hat.com; jgg@...dia.com; yishaih@...dia.com;
> Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>;
> kevin.tian@...el.com
> Cc: brett.creeley@....com; shannon.nelson@....com
> Subject: [PATCH v10 vfio 3/7] vfio/pds: register with the pds_core PF
>
> The pds_core driver will supply adminq services, so find the PF
> and register with the DSC services.
>
> Use the following commands to enable a VF:
> echo 1 > /sys/bus/pci/drivers/pds_core/$PF_BDF/sriov_numvfs
>
> Signed-off-by: Brett Creeley <brett.creeley@....com>
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
> ---
> drivers/vfio/pci/pds/Makefile | 1 +
> drivers/vfio/pci/pds/cmds.c | 43
> +++++++++++++++++++++++++++++++++
> drivers/vfio/pci/pds/cmds.h | 10 ++++++++
> drivers/vfio/pci/pds/pci_drv.c | 19 +++++++++++++++
> drivers/vfio/pci/pds/pci_drv.h | 9 +++++++
> drivers/vfio/pci/pds/vfio_dev.c | 11 +++++++++
> drivers/vfio/pci/pds/vfio_dev.h | 6 +++++
> include/linux/pds/pds_common.h | 2 ++
> 8 files changed, 101 insertions(+)
> create mode 100644 drivers/vfio/pci/pds/cmds.c
> create mode 100644 drivers/vfio/pci/pds/cmds.h
> create mode 100644 drivers/vfio/pci/pds/pci_drv.h
>
> diff --git a/drivers/vfio/pci/pds/Makefile b/drivers/vfio/pci/pds/Makefile
> index e1a55ae0f079..87581111fa17 100644
> --- a/drivers/vfio/pci/pds/Makefile
> +++ b/drivers/vfio/pci/pds/Makefile
> @@ -4,5 +4,6 @@
> obj-$(CONFIG_PDS_VFIO_PCI) += pds_vfio.o
>
> pds_vfio-y := \
> + cmds.o \
> pci_drv.o \
> vfio_dev.o
> diff --git a/drivers/vfio/pci/pds/cmds.c b/drivers/vfio/pci/pds/cmds.c
> new file mode 100644
> index 000000000000..ae01f5df2f5c
> --- /dev/null
> +++ b/drivers/vfio/pci/pds/cmds.c
> @@ -0,0 +1,43 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
> +
> +#include <linux/io.h>
> +#include <linux/types.h>
> +
> +#include <linux/pds/pds_common.h>
> +#include <linux/pds/pds_core_if.h>
> +#include <linux/pds/pds_adminq.h>
> +
> +#include "vfio_dev.h"
> +#include "cmds.h"
> +
> +int pds_vfio_register_client_cmd(struct pds_vfio_pci_device *pds_vfio)
> +{
> + struct pci_dev *pdev = pds_vfio_to_pci_dev(pds_vfio);
> + char devname[PDS_DEVNAME_LEN];
> + int ci;
> +
> + snprintf(devname, sizeof(devname), "%s.%d-%u", PDS_LM_DEV_NAME,
> + pci_domain_nr(pdev->bus), pds_vfio->pci_id);
> +
> + ci = pds_client_register(pci_physfn(pdev), devname);
> + if (ci <= 0)
> + return ci;
So 0 is not a valid id I guess but we return 0 here. But below where
pds_vfio_register_client_cmd() is called, 0 return is treated as success.
Note: Also in drivers..../auxbus.c the comment says the function returns 0
on success!.
Please check.
Thanks,
Shameer
> +
> + pds_vfio->client_id = ci;
> +
> + return 0;
> +}
> +
> +void pds_vfio_unregister_client_cmd(struct pds_vfio_pci_device *pds_vfio)
> +{
> + struct pci_dev *pdev = pds_vfio_to_pci_dev(pds_vfio);
> + int err;
> +
> + err = pds_client_unregister(pci_physfn(pdev), pds_vfio->client_id);
> + if (err)
> + dev_err(&pdev->dev, "unregister from DSC failed: %pe\n",
> + ERR_PTR(err));
> +
> + pds_vfio->client_id = 0;
> +}
> diff --git a/drivers/vfio/pci/pds/cmds.h b/drivers/vfio/pci/pds/cmds.h
> new file mode 100644
> index 000000000000..4c592afccf89
> --- /dev/null
> +++ b/drivers/vfio/pci/pds/cmds.h
> @@ -0,0 +1,10 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
> +
> +#ifndef _CMDS_H_
> +#define _CMDS_H_
> +
> +int pds_vfio_register_client_cmd(struct pds_vfio_pci_device *pds_vfio);
> +void pds_vfio_unregister_client_cmd(struct pds_vfio_pci_device *pds_vfio);
> +
> +#endif /* _CMDS_H_ */
> diff --git a/drivers/vfio/pci/pds/pci_drv.c b/drivers/vfio/pci/pds/pci_drv.c
> index 0e84249069d4..a49420aa9736 100644
> --- a/drivers/vfio/pci/pds/pci_drv.c
> +++ b/drivers/vfio/pci/pds/pci_drv.c
> @@ -8,9 +8,13 @@
> #include <linux/types.h>
> #include <linux/vfio.h>
>
> +#include <linux/pds/pds_common.h>
> #include <linux/pds/pds_core_if.h>
> +#include <linux/pds/pds_adminq.h>
>
> #include "vfio_dev.h"
> +#include "pci_drv.h"
> +#include "cmds.h"
>
> #define PDS_VFIO_DRV_DESCRIPTION "AMD/Pensando VFIO Device
> Driver"
> #define PCI_VENDOR_ID_PENSANDO 0x1dd8
> @@ -27,13 +31,27 @@ static int pds_vfio_pci_probe(struct pci_dev *pdev,
> return PTR_ERR(pds_vfio);
>
> dev_set_drvdata(&pdev->dev, &pds_vfio->vfio_coredev);
> + pds_vfio->pdsc = pdsc_get_pf_struct(pdev);
> + if (IS_ERR_OR_NULL(pds_vfio->pdsc)) {
> + err = PTR_ERR(pds_vfio->pdsc) ?: -ENODEV;
> + goto out_put_vdev;
> + }
>
> err = vfio_pci_core_register_device(&pds_vfio->vfio_coredev);
> if (err)
> goto out_put_vdev;
>
> + err = pds_vfio_register_client_cmd(pds_vfio);
> + if (err) {
> + dev_err(&pdev->dev, "failed to register as client: %pe\n",
> + ERR_PTR(err));
> + goto out_unregister_coredev;
> + }
> +
> return 0;
>
> +out_unregister_coredev:
> + vfio_pci_core_unregister_device(&pds_vfio->vfio_coredev);
> out_put_vdev:
> vfio_put_device(&pds_vfio->vfio_coredev.vdev);
> return err;
> @@ -43,6 +61,7 @@ static void pds_vfio_pci_remove(struct pci_dev *pdev)
> {
> struct pds_vfio_pci_device *pds_vfio = pds_vfio_pci_drvdata(pdev);
>
> + pds_vfio_unregister_client_cmd(pds_vfio);
> vfio_pci_core_unregister_device(&pds_vfio->vfio_coredev);
> vfio_put_device(&pds_vfio->vfio_coredev.vdev);
> }
> diff --git a/drivers/vfio/pci/pds/pci_drv.h b/drivers/vfio/pci/pds/pci_drv.h
> new file mode 100644
> index 000000000000..e79bed12ed14
> --- /dev/null
> +++ b/drivers/vfio/pci/pds/pci_drv.h
> @@ -0,0 +1,9 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
> +
> +#ifndef _PCI_DRV_H
> +#define _PCI_DRV_H
> +
> +#include <linux/pci.h>
> +
> +#endif /* _PCI_DRV_H */
> diff --git a/drivers/vfio/pci/pds/vfio_dev.c b/drivers/vfio/pci/pds/vfio_dev.c
> index 4038dac90a97..39771265b78f 100644
> --- a/drivers/vfio/pci/pds/vfio_dev.c
> +++ b/drivers/vfio/pci/pds/vfio_dev.c
> @@ -6,6 +6,11 @@
>
> #include "vfio_dev.h"
>
> +struct pci_dev *pds_vfio_to_pci_dev(struct pds_vfio_pci_device *pds_vfio)
> +{
> + return pds_vfio->vfio_coredev.pdev;
> +}
> +
> struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev)
> {
> struct vfio_pci_core_device *core_device =
> dev_get_drvdata(&pdev->dev);
> @@ -29,6 +34,12 @@ static int pds_vfio_init_device(struct vfio_device
> *vdev)
> pds_vfio->vf_id = pci_iov_vf_id(pdev);
> pds_vfio->pci_id = PCI_DEVID(pdev->bus->number, pdev->devfn);
>
> + dev_dbg(&pdev->dev,
> + "%s: PF %#04x VF %#04x (%d) vf_id %d domain %d
> pds_vfio %p\n",
> + __func__, pci_dev_id(pdev->physfn), pds_vfio->pci_id,
> + pds_vfio->pci_id, pds_vfio->vf_id, pci_domain_nr(pdev->bus),
> + pds_vfio);
> +
> return 0;
> }
>
> diff --git a/drivers/vfio/pci/pds/vfio_dev.h b/drivers/vfio/pci/pds/vfio_dev.h
> index 66cfcab5b5bf..92e8ff241ca8 100644
> --- a/drivers/vfio/pci/pds/vfio_dev.h
> +++ b/drivers/vfio/pci/pds/vfio_dev.h
> @@ -7,14 +7,20 @@
> #include <linux/pci.h>
> #include <linux/vfio_pci_core.h>
>
> +struct pdsc;
> +
> struct pds_vfio_pci_device {
> struct vfio_pci_core_device vfio_coredev;
> + struct pdsc *pdsc;
>
> int vf_id;
> int pci_id;
> + u16 client_id;
> };
>
> const struct vfio_device_ops *pds_vfio_ops_info(void);
> struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev);
>
> +struct pci_dev *pds_vfio_to_pci_dev(struct pds_vfio_pci_device *pds_vfio);
> +
> #endif /* _VFIO_DEV_H_ */
> diff --git a/include/linux/pds/pds_common.h
> b/include/linux/pds/pds_common.h
> index 060331486d50..721453bdf975 100644
> --- a/include/linux/pds/pds_common.h
> +++ b/include/linux/pds/pds_common.h
> @@ -39,6 +39,8 @@ enum pds_core_vif_types {
> #define PDS_DEV_TYPE_RDMA_STR "RDMA"
> #define PDS_DEV_TYPE_LM_STR "LM"
>
> +#define PDS_LM_DEV_NAME PDS_CORE_DRV_NAME "."
> PDS_DEV_TYPE_LM_STR
> +
> #define PDS_CORE_IFNAMSIZ 16
>
> /**
> --
> 2.17.1
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