[RFC PATCH v4 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     | 66 +++++++++++++++++++++++++++++++++
 drivers/vfio/pci/pds/cmds.h     | 12 ++++++
 drivers/vfio/pci/pds/pci_drv.c  | 14 ++++++-
 drivers/vfio/pci/pds/pci_drv.h  |  9 +++++
 drivers/vfio/pci/pds/vfio_dev.c |  5 +++
 drivers/vfio/pci/pds/vfio_dev.h |  2 +
 include/linux/pds/pds_lm.h      | 12 ++++++
 8 files changed, 120 insertions(+), 1 deletion(-)
 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
 create mode 100644 include/linux/pds/pds_lm.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..e30ecea91e09
--- /dev/null
+++ b/drivers/vfio/pci/pds/cmds.c
@@ -0,0 +1,66 @@
+// 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_core_if.h>
+#include <linux/pds/pds_core.h>
+#include <linux/pds/pds_adminq.h>
+#include <linux/pds/pds_lm.h>
+
+#include "vfio_dev.h"
+#include "cmds.h"
+
+int
+pds_vfio_register_client_cmd(struct pds_vfio_pci_device *pds_vfio)
+{
+	union pds_core_adminq_comp comp = { 0 };
+	union pds_core_adminq_cmd cmd = { 0 };
+	struct device *dev;
+	int err;
+	u16 ci;
+
+	dev = &pds_vfio->pdev->dev;
+	cmd.client_reg.opcode = PDS_AQ_CMD_CLIENT_REG;
+	snprintf(cmd.client_reg.devname, sizeof(cmd.client_reg.devname),
+		 "%s.%d", PDS_LM_DEV_NAME, pds_vfio->pdsc->id);
+
+	err = pdsc_adminq_post(pds_vfio->pdsc, &pds_vfio->pdsc->adminqcq,
+			       &cmd, &comp, false);
+	if (err) {
+		dev_info(dev, "register with DSC failed, status %d: %pe\n",
+			 comp.status, ERR_PTR(err));
+		return err;
+	}
+
+	ci = le16_to_cpu(comp.client_reg.client_id);
+	if (!ci) {
+		dev_err(dev, "%s: device returned null client_id\n", __func__);
+		return -EIO;
+	}
+	pds_vfio->client_id = ci;
+
+	return 0;
+}
+
+void
+pds_vfio_unregister_client_cmd(struct pds_vfio_pci_device *pds_vfio)
+{
+	union pds_core_adminq_comp comp = { 0 };
+	union pds_core_adminq_cmd cmd = { 0 };
+	struct device *dev;
+	int err;
+
+	dev = &pds_vfio->pdev->dev;
+	cmd.client_unreg.opcode = PDS_AQ_CMD_CLIENT_UNREG;
+	cmd.client_unreg.client_id = cpu_to_le16(pds_vfio->client_id);
+
+	err = pdsc_adminq_post(pds_vfio->pdsc, &pds_vfio->pdsc->adminqcq,
+			       &cmd, &comp, false);
+	if (err)
+		dev_info(dev, "unregister from DSC failed, status %d: %pe\n",
+			 comp.status, 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..5efc54a7b9b9
--- /dev/null
+++ b/drivers/vfio/pci/pds/cmds.h
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#ifndef _CMDS_H_
+#define _CMDS_H_
+
+struct pds_vfio_pci_device;
+
+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 5e554420792e..b1e5ea854200 100644
--- a/drivers/vfio/pci/pds/pci_drv.c
+++ b/drivers/vfio/pci/pds/pci_drv.c
@@ -9,8 +9,11 @@
 #include <linux/vfio.h>
 
 #include <linux/pds/pds_core_if.h>
+#include <linux/pds/pds_core.h>
 
 #include "vfio_dev.h"
+#include "pci_drv.h"
+#include "cmds.h"
 
 #define PDS_VFIO_DRV_NAME		"pds_vfio"
 #define PDS_VFIO_DRV_DESCRIPTION	"AMD/Pensando VFIO Device Driver"
@@ -30,13 +33,22 @@ pds_vfio_pci_probe(struct pci_dev *pdev,
 
 	dev_set_drvdata(&pdev->dev, &pds_vfio->vfio_coredev);
 	pds_vfio->pdev = pdev;
+	pds_vfio->pdsc = pdsc_get_pf_struct(pdev);
+
+	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_put_vdev;
+	}
 
 	err = vfio_pci_core_register_device(&pds_vfio->vfio_coredev);
 	if (err)
-		goto out_put_vdev;
+		goto out_unreg_client;
 
 	return 0;
 
+out_unreg_client:
 out_put_vdev:
 	vfio_put_device(&pds_vfio->vfio_coredev.vdev);
 	return err;
diff --git a/drivers/vfio/pci/pds/pci_drv.h b/drivers/vfio/pci/pds/pci_drv.h
new file mode 100644
index 000000000000..1b192aecf343
--- /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 f1221f14e4f6..592b10a279f0 100644
--- a/drivers/vfio/pci/pds/vfio_dev.c
+++ b/drivers/vfio/pci/pds/vfio_dev.c
@@ -31,6 +31,11 @@ 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 d9f0203c1649..614640194c36 100644
--- a/drivers/vfio/pci/pds/vfio_dev.h
+++ b/drivers/vfio/pci/pds/vfio_dev.h
@@ -10,9 +10,11 @@
 struct pds_vfio_pci_device {
 	struct vfio_pci_core_device vfio_coredev;
 	struct pci_dev *pdev;
+	struct pdsc *pdsc;
 
 	int vf_id;
 	int pci_id;
+	u16 client_id;
 };
 
 const struct vfio_device_ops *pds_vfio_ops_info(void);
diff --git a/include/linux/pds/pds_lm.h b/include/linux/pds/pds_lm.h
new file mode 100644
index 000000000000..fdaf2bf71d35
--- /dev/null
+++ b/include/linux/pds/pds_lm.h
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2022 Pensando Systems, Inc */
+
+#ifndef _PDS_LM_H_
+#define _PDS_LM_H_
+
+#include "pds_common.h"
+
+#define PDS_DEV_TYPE_LM_STR	"LM"
+#define PDS_LM_DEV_NAME		PDS_CORE_DRV_NAME "." PDS_DEV_TYPE_LM_STR
+
+#endif /* _PDS_LM_H_ */
-- 
2.17.1




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