pds_vdpa: add vdpa config client commands

These are the adminq commands that will be needed for
setting up and using the vDPA device.  There are a number
of commands defined in the FW's API, but by making use of
the FW's virtio BAR we only need a few of these commands
for vDPA support.

Signed-off-by: Shannon Nelson <[email protected]>
Acked-by: Jason Wang <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>

drivers/vdpa/pds/Makefile

@@ -4,6 +4,7 @@
 obj-$(CONFIG_PDS_VDPA) := pds_vdpa.o
 
 pds_vdpa-y := aux_drv.o \
+	      cmds.o \
 	      vdpa_dev.o
 
 pds_vdpa-$(CONFIG_DEBUG_FS) += debugfs.o

drivers/vdpa/pds/cmds.c

@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2023 Advanced Micro Devices, Inc */
+
+#include <linux/vdpa.h>
+#include <linux/virtio_pci_modern.h>
+
+#include <linux/pds/pds_common.h>
+#include <linux/pds/pds_core_if.h>
+#include <linux/pds/pds_adminq.h>
+#include <linux/pds/pds_auxbus.h>
+
+#include "vdpa_dev.h"
+#include "aux_drv.h"
+#include "cmds.h"
+
+int pds_vdpa_init_hw(struct pds_vdpa_device *pdsv)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	union pds_core_adminq_cmd cmd = {
+		.vdpa_init.opcode = PDS_VDPA_CMD_INIT,
+		.vdpa_init.vdpa_index = pdsv->vdpa_index,
+		.vdpa_init.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+	};
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	/* Initialize the vdpa/virtio device */
+	err = pds_client_adminq_cmd(padev, &cmd, sizeof(cmd.vdpa_init),
+				    &comp, 0);
+	if (err)
+		dev_dbg(dev, "Failed to init hw, status %d: %pe\n",
+			comp.status, ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vdpa_cmd_reset(struct pds_vdpa_device *pdsv)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	union pds_core_adminq_cmd cmd = {
+		.vdpa.opcode = PDS_VDPA_CMD_RESET,
+		.vdpa.vdpa_index = pdsv->vdpa_index,
+		.vdpa.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+	};
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	err = pds_client_adminq_cmd(padev, &cmd, sizeof(cmd.vdpa), &comp, 0);
+	if (err)
+		dev_dbg(dev, "Failed to reset hw, status %d: %pe\n",
+			comp.status, ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vdpa_cmd_set_status(struct pds_vdpa_device *pdsv, u8 status)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	union pds_core_adminq_cmd cmd = {
+		.vdpa_status.opcode = PDS_VDPA_CMD_STATUS_UPDATE,
+		.vdpa_status.vdpa_index = pdsv->vdpa_index,
+		.vdpa_status.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+		.vdpa_status.status = status,
+	};
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	err = pds_client_adminq_cmd(padev, &cmd, sizeof(cmd.vdpa_status), &comp, 0);
+	if (err)
+		dev_dbg(dev, "Failed to set status to %#x, error status %d: %pe\n",
+			status, comp.status, ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vdpa_cmd_set_mac(struct pds_vdpa_device *pdsv, u8 *mac)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	union pds_core_adminq_cmd cmd = {
+		.vdpa_setattr.opcode = PDS_VDPA_CMD_SET_ATTR,
+		.vdpa_setattr.vdpa_index = pdsv->vdpa_index,
+		.vdpa_setattr.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+		.vdpa_setattr.attr = PDS_VDPA_ATTR_MAC,
+	};
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	ether_addr_copy(cmd.vdpa_setattr.mac, mac);
+	err = pds_client_adminq_cmd(padev, &cmd, sizeof(cmd.vdpa_setattr),
+				    &comp, 0);
+	if (err)
+		dev_dbg(dev, "Failed to set mac address %pM, status %d: %pe\n",
+			mac, comp.status, ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vdpa_cmd_set_max_vq_pairs(struct pds_vdpa_device *pdsv, u16 max_vqp)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	union pds_core_adminq_cmd cmd = {
+		.vdpa_setattr.opcode = PDS_VDPA_CMD_SET_ATTR,
+		.vdpa_setattr.vdpa_index = pdsv->vdpa_index,
+		.vdpa_setattr.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+		.vdpa_setattr.attr = PDS_VDPA_ATTR_MAX_VQ_PAIRS,
+		.vdpa_setattr.max_vq_pairs = cpu_to_le16(max_vqp),
+	};
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	err = pds_client_adminq_cmd(padev, &cmd, sizeof(cmd.vdpa_setattr),
+				    &comp, 0);
+	if (err)
+		dev_dbg(dev, "Failed to set max vq pairs %u, status %d: %pe\n",
+			max_vqp, comp.status, ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vdpa_cmd_init_vq(struct pds_vdpa_device *pdsv, u16 qid, u16 invert_idx,
+			 struct pds_vdpa_vq_info *vq_info)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	union pds_core_adminq_cmd cmd = {
+		.vdpa_vq_init.opcode = PDS_VDPA_CMD_VQ_INIT,
+		.vdpa_vq_init.vdpa_index = pdsv->vdpa_index,
+		.vdpa_vq_init.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+		.vdpa_vq_init.qid = cpu_to_le16(qid),
+		.vdpa_vq_init.len = cpu_to_le16(ilog2(vq_info->q_len)),
+		.vdpa_vq_init.desc_addr = cpu_to_le64(vq_info->desc_addr),
+		.vdpa_vq_init.avail_addr = cpu_to_le64(vq_info->avail_addr),
+		.vdpa_vq_init.used_addr = cpu_to_le64(vq_info->used_addr),
+		.vdpa_vq_init.intr_index = cpu_to_le16(qid),
+		.vdpa_vq_init.avail_index = cpu_to_le16(vq_info->avail_idx ^ invert_idx),
+		.vdpa_vq_init.used_index = cpu_to_le16(vq_info->used_idx ^ invert_idx),
+	};
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	dev_dbg(dev, "%s: qid %d len %d desc_addr %#llx avail_addr %#llx used_addr %#llx\n",
+		__func__, qid, ilog2(vq_info->q_len),
+		vq_info->desc_addr, vq_info->avail_addr, vq_info->used_addr);
+
+	err = pds_client_adminq_cmd(padev, &cmd, sizeof(cmd.vdpa_vq_init),
+				    &comp, 0);
+	if (err)
+		dev_dbg(dev, "Failed to init vq %d, status %d: %pe\n",
+			qid, comp.status, ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vdpa_cmd_reset_vq(struct pds_vdpa_device *pdsv, u16 qid, u16 invert_idx,
+			  struct pds_vdpa_vq_info *vq_info)
+{
+	struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
+	struct device *dev = &padev->aux_dev.dev;
+	union pds_core_adminq_cmd cmd = {
+		.vdpa_vq_reset.opcode = PDS_VDPA_CMD_VQ_RESET,
+		.vdpa_vq_reset.vdpa_index = pdsv->vdpa_index,
+		.vdpa_vq_reset.vf_id = cpu_to_le16(pdsv->vdpa_aux->vf_id),
+		.vdpa_vq_reset.qid = cpu_to_le16(qid),
+	};
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	err = pds_client_adminq_cmd(padev, &cmd, sizeof(cmd.vdpa_vq_reset),
+				    &comp, 0);
+	if (err) {
+		dev_dbg(dev, "Failed to reset vq %d, status %d: %pe\n",
+			qid, comp.status, ERR_PTR(err));
+		return err;
+	}
+
+	vq_info->avail_idx = le16_to_cpu(comp.vdpa_vq_reset.avail_index) ^ invert_idx;
+	vq_info->used_idx = le16_to_cpu(comp.vdpa_vq_reset.used_index) ^ invert_idx;
+
+	return 0;
+}

drivers/vdpa/pds/cmds.h

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright(c) 2023 Advanced Micro Devices, Inc */
+
+#ifndef _VDPA_CMDS_H_
+#define _VDPA_CMDS_H_
+
+int pds_vdpa_init_hw(struct pds_vdpa_device *pdsv);
+
+int pds_vdpa_cmd_reset(struct pds_vdpa_device *pdsv);
+int pds_vdpa_cmd_set_status(struct pds_vdpa_device *pdsv, u8 status);
+int pds_vdpa_cmd_set_mac(struct pds_vdpa_device *pdsv, u8 *mac);
+int pds_vdpa_cmd_set_max_vq_pairs(struct pds_vdpa_device *pdsv, u16 max_vqp);
+int pds_vdpa_cmd_init_vq(struct pds_vdpa_device *pdsv, u16 qid, u16 invert_idx,
+			 struct pds_vdpa_vq_info *vq_info);
+int pds_vdpa_cmd_reset_vq(struct pds_vdpa_device *pdsv, u16 qid, u16 invert_idx,
+			  struct pds_vdpa_vq_info *vq_info);
+int pds_vdpa_cmd_set_features(struct pds_vdpa_device *pdsv, u64 features);
+#endif /* _VDPA_CMDS_H_ */

drivers/vdpa/pds/vdpa_dev.h

@@ -4,11 +4,42 @@
 #ifndef _VDPA_DEV_H_
 #define _VDPA_DEV_H_
 
-#define PDS_VDPA_MAX_QUEUES	65
+#include <linux/pci.h>
+#include <linux/vdpa.h>
+
+struct pds_vdpa_vq_info {
+	bool ready;
+	u64 desc_addr;
+	u64 avail_addr;
+	u64 used_addr;
+	u32 q_len;
+	u16 qid;
+	int irq;
+	char irq_name[32];
+
+	void __iomem *notify;
+	dma_addr_t notify_pa;
+
+	u64 doorbell;
+	u16 avail_idx;
+	u16 used_idx;
 
+	struct vdpa_callback event_cb;
+	struct pds_vdpa_device *pdsv;
+};
+
+#define PDS_VDPA_MAX_QUEUES	65
+#define PDS_VDPA_MAX_QLEN	32768
 struct pds_vdpa_device {
 	struct vdpa_device vdpa_dev;
 	struct pds_vdpa_aux *vdpa_aux;
+
+	struct pds_vdpa_vq_info vqs[PDS_VDPA_MAX_QUEUES];
+	u64 req_features;		/* features requested by vdpa */
+	u64 actual_features;		/* features negotiated and in use */
+	u8 vdpa_index;			/* rsvd for future subdevice use */
+	u8 num_vqs;			/* num vqs in use */
+	struct vdpa_callback config_cb;
 };
 
 int pds_vdpa_get_mgmt_info(struct pds_vdpa_aux *vdpa_aux);