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Date: Thu, 15 Jun 2023 14:30:42 -0700
From: Brett Creeley <bcreeley@....com>
To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>,
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
On 6/15/2023 2:05 PM, Shameerali Kolothum Thodi wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
>
>
>> -----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
Hey Shameer,
Thanks for catching these issues. It looks like there are a couple
things that need to be fixed.
[1] pds_vfio_register_client_cmd() needs to always return negative on
error, which includes ci == 0. I don't think we would ever hit this case
because drivers..../auxbus.c returns -EIO when ci == 0, but best to fix
it in case that ever changes.
[2] Documentation for pds_client_register in drivers..../auxbus.c needs
to be updated to say something like the following:
Return: Client ID on succes, or negative for error
I will fix [1] in the next rev of this series. For [2] we will submit a
separate follow on patch to clean up the wording.
Thanks for the review,
Brett
>> +
>> + 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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