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Date: Tue, 1 Aug 2023 08:44:25 -0700
From: Brett Creeley <bcreeley@....com>
To: Alex Williamson <alex.williamson@...hat.com>,
Brett Creeley <brett.creeley@....com>
Cc: kvm@...r.kernel.org, netdev@...r.kernel.org, jgg@...dia.com,
yishaih@...dia.com, shameerali.kolothum.thodi@...wei.com,
kevin.tian@...el.com, simon.horman@...igine.com, shannon.nelson@....com
Subject: Re: [PATCH v13 vfio 3/7] vfio/pds: register with the pds_core PF
On 7/31/2023 1:57 PM, Alex Williamson wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
>
>
> On Tue, 25 Jul 2023 14:40:21 -0700
> Brett Creeley <brett.creeley@....com> wrote:
>
>> 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/$PF_BDF/sriov_numvfs
>>
>> Signed-off-by: Brett Creeley <brett.creeley@....com>
>> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
>> ---
>> drivers/vfio/pci/pds/Makefile | 1 +
>> drivers/vfio/pci/pds/cmds.c | 44 +++++++++++++++++++++++++++++++++
>> drivers/vfio/pci/pds/cmds.h | 10 ++++++++
>> drivers/vfio/pci/pds/pci_drv.c | 19 ++++++++++++++
>> drivers/vfio/pci/pds/pci_drv.h | 9 +++++++
>> drivers/vfio/pci/pds/vfio_dev.c | 13 +++++++++-
>> drivers/vfio/pci/pds/vfio_dev.h | 6 +++++
>> include/linux/pds/pds_common.h | 3 ++-
>> 8 files changed, 103 insertions(+), 2 deletions(-)
>> create mode 100644 drivers/vfio/pci/pds/cmds.c
>> create mode 100644 drivers/vfio/pci/pds/cmds.h
>> create mode 100644 drivers/vfio/pci/pds/pci_drv.h
>>
>> diff --git a/drivers/vfio/pci/pds/Makefile b/drivers/vfio/pci/pds/Makefile
>> index e5e53a6d86d1..91587c7fe8f9 100644
>> --- a/drivers/vfio/pci/pds/Makefile
>> +++ b/drivers/vfio/pci/pds/Makefile
>> @@ -4,5 +4,6 @@
>> obj-$(CONFIG_PDS_VFIO_PCI) += pds-vfio-pci.o
>>
>> pds-vfio-pci-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..198e8e2ed002
>> --- /dev/null
>> +++ b/drivers/vfio/pci/pds/cmds.c
>> @@ -0,0 +1,44 @@
>> +// 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_VFIO_LM_DEV_NAME,
>> + pci_domain_nr(pdev->bus),
>> + PCI_DEVID(pdev->bus->number, pdev->devfn));
>> +
>> + ci = pds_client_register(pci_physfn(pdev), devname);
>> + if (ci < 0)
>> + return ci;
>> +
>> + pds_vfio->client_id = ci;
>
> Not to be solved in this series, but the documentation is wrong:
>
> /**
> * pds_client_register - Link the client to the firmware
> * @pf_pdev: ptr to the PF driver struct
> * @devname: name that includes service into, e.g. pds_core.vDPA
> *
> * Return: 0 on success, or
> * negative for error
> */
>
> But obviously it does return the client ID and cannot return 0. Thanks,
Let me push out a separate patch today that fixes this.
Thanks,
Brett
>
> Alex
>
>> +
>> + 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 4670ddda603a..928903a84f27 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 6d7ff1e07373..ce42f0b461b3 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);
>> @@ -20,7 +25,7 @@ static int pds_vfio_init_device(struct vfio_device *vdev)
>> container_of(vdev, struct pds_vfio_pci_device,
>> vfio_coredev.vdev);
>> struct pci_dev *pdev = to_pci_dev(vdev->dev);
>> - int err, vf_id;
>> + int err, vf_id, pci_id;
>>
>> vf_id = pci_iov_vf_id(pdev);
>> if (vf_id < 0)
>> @@ -32,6 +37,12 @@ static int pds_vfio_init_device(struct vfio_device *vdev)
>>
>> pds_vfio->vf_id = vf_id;
>>
>> + pci_id = PCI_DEVID(pdev->bus->number, pdev->devfn);
>> + dev_dbg(&pdev->dev,
>> + "%s: PF %#04x VF %#04x vf_id %d domain %d pds_vfio %p\n",
>> + __func__, pci_dev_id(pdev->physfn), pci_id, 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 a4d4b65778d1..824832aa1513 100644
>> --- a/drivers/vfio/pci/pds/vfio_dev.h
>> +++ b/drivers/vfio/pci/pds/vfio_dev.h
>> @@ -7,13 +7,19 @@
>> #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;
>> + 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 435c8e8161c2..1295ff2518a6 100644
>> --- a/include/linux/pds/pds_common.h
>> +++ b/include/linux/pds/pds_common.h
>> @@ -34,12 +34,13 @@ enum pds_core_vif_types {
>>
>> #define PDS_DEV_TYPE_CORE_STR "Core"
>> #define PDS_DEV_TYPE_VDPA_STR "vDPA"
>> -#define PDS_DEV_TYPE_VFIO_STR "VFio"
>> +#define PDS_DEV_TYPE_VFIO_STR "vfio"
>> #define PDS_DEV_TYPE_ETH_STR "Eth"
>> #define PDS_DEV_TYPE_RDMA_STR "RDMA"
>> #define PDS_DEV_TYPE_LM_STR "LM"
>>
>> #define PDS_VDPA_DEV_NAME PDS_CORE_DRV_NAME "." PDS_DEV_TYPE_VDPA_STR
>> +#define PDS_VFIO_LM_DEV_NAME PDS_CORE_DRV_NAME "." PDS_DEV_TYPE_LM_STR "." PDS_DEV_TYPE_VFIO_STR
>>
>> int pdsc_register_notify(struct notifier_block *nb);
>> void pdsc_unregister_notify(struct notifier_block *nb);
>
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