[PATCH v10 vfio 3/7] vfio/pds: register with the pds_core PF

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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@xxxxxxx>
Signed-off-by: Shannon Nelson <shannon.nelson@xxxxxxx>
---
 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;
+
+	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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