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 <[e-mail]>
Signed-off-by: Shannon Nelson <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Reviewed-by: Kevin Tian <[e-mail]>
Reviewed-by: Shameer Kolothum <[e-mail]>
Reviewed-by: Jason Gunthorpe <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alex Williamson <[e-mail]>

drivers/vfio/pci/pds/Makefile

···
 obj-$(CONFIG_PDS_VFIO_PCI) += pds-vfio-pci.o
 
 pds-vfio-pci-y := \
+	cmds.o		\
 	pci_drv.o	\
 	vfio_dev.o

drivers/vfio/pci/pds/cmds.c

···
+// 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];
+	struct pdsc *pdsc;
+	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));
+
+	pdsc = pdsc_get_pf_struct(pdev);
+	if (IS_ERR(pdsc))
+		return PTR_ERR(pdsc);
+
+	ci = pds_client_register(pdsc, devname);
+	if (ci < 0)
+		return ci;
+
+	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);
+	struct pdsc *pdsc;
+	int err;
+
+	pdsc = pdsc_get_pf_struct(pdev);
+	if (IS_ERR(pdsc))
+		return;
+
+	err = pds_client_unregister(pdsc, pds_vfio->client_id);
+	if (err)
+		dev_err(&pdev->dev, "unregister from DSC failed: %pe\n",
+			ERR_PTR(err));
+
+	pds_vfio->client_id = 0;
+}

drivers/vfio/pci/pds/cmds.h

···
+/* 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_ */

drivers/vfio/pci/pds/pci_drv.c

···
 #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
···
 	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;
···
 {
 	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);
 }

drivers/vfio/pci/pds/pci_drv.h

···
+/* 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 */

drivers/vfio/pci/pds/vfio_dev.c

···
 
 #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);
···
 		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)
···
 		return err;
 
 	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;
 }

drivers/vfio/pci/pds/vfio_dev.h

···
 	struct vfio_pci_core_device vfio_coredev;
 
 	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_ */

include/linux/pds/pds_common.h

···
 
 #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
 
 struct pdsc;