pds_vdpa: get vdpa management info

Find the vDPA management information from the DSC in order to
advertise it to the vdpa subsystem.
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230519215632.12343-7-shannon.nelson@amd.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/vdpa/pds/Makefile

@@ -3,6 +3,7 @@
 
 obj-$(CONFIG_PDS_VDPA) := pds_vdpa.o
 
-pds_vdpa-y := aux_drv.o
+pds_vdpa-y := aux_drv.o \
+	      vdpa_dev.o
 
 pds_vdpa-$(CONFIG_DEBUG_FS) += debugfs.o

drivers/vdpa/pds/aux_drv.c

@@ -3,6 +3,7 @@
 
 #include <linux/auxiliary_bus.h>
 #include <linux/pci.h>
+#include <linux/vdpa.h>
 
 #include <linux/pds/pds_common.h>
 #include <linux/pds/pds_core_if.h>
@@ -11,6 +12,7 @@
 
 #include "aux_drv.h"
 #include "debugfs.h"
+#include "vdpa_dev.h"
 
 static const struct auxiliary_device_id pds_vdpa_id_table[] = {
 	{ .name = PDS_VDPA_DEV_NAME, },
@@ -24,15 +26,28 @@ static int pds_vdpa_probe(struct auxiliary_device *aux_dev,
 	struct pds_auxiliary_dev *padev =
 		container_of(aux_dev, struct pds_auxiliary_dev, aux_dev);
 	struct pds_vdpa_aux *vdpa_aux;
+	int err;
 
 	vdpa_aux = kzalloc(sizeof(*vdpa_aux), GFP_KERNEL);
 	if (!vdpa_aux)
 		return -ENOMEM;
 
 	vdpa_aux->padev = padev;
+	vdpa_aux->vf_id = pci_iov_vf_id(padev->vf_pdev);
 	auxiliary_set_drvdata(aux_dev, vdpa_aux);
 
+	/* Get device ident info and set up the vdpa_mgmt_dev */
+	err = pds_vdpa_get_mgmt_info(vdpa_aux);
+	if (err)
+		goto err_free_mem;
+
 	return 0;
+
+err_free_mem:
+	kfree(vdpa_aux);
+	auxiliary_set_drvdata(aux_dev, NULL);
+
+	return err;
 }
 
 static void pds_vdpa_remove(struct auxiliary_device *aux_dev)
@@ -40,6 +55,8 @@ static void pds_vdpa_remove(struct auxiliary_device *aux_dev)
 	struct pds_vdpa_aux *vdpa_aux = auxiliary_get_drvdata(aux_dev);
 	struct device *dev = &aux_dev->dev;
 
+	pci_free_irq_vectors(vdpa_aux->padev->vf_pdev);
+
 	kfree(vdpa_aux);
 	auxiliary_set_drvdata(aux_dev, NULL);
 

drivers/vdpa/pds/aux_drv.h

@@ -10,6 +10,13 @@
 struct pds_vdpa_aux {
 	struct pds_auxiliary_dev *padev;
 
+	struct vdpa_mgmt_dev vdpa_mdev;
+
+	struct pds_vdpa_ident ident;
+
+	int vf_id;
 	struct dentry *dentry;
+
+	int nintrs;
 };
 #endif /* _AUX_DRV_H_ */

drivers/vdpa/pds/debugfs.c

@@ -2,6 +2,7 @@
 /* Copyright(c) 2023 Advanced Micro Devices, Inc */
 
 #include <linux/pci.h>
+#include <linux/vdpa.h>
 
 #include <linux/pds/pds_common.h>
 #include <linux/pds/pds_core_if.h>

drivers/vdpa/pds/vdpa_dev.c

+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2023 Advanced Micro Devices, Inc */
+
+#include <linux/pci.h>
+#include <linux/vdpa.h>
+#include <uapi/linux/vdpa.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"
+
+static struct virtio_device_id pds_vdpa_id_table[] = {
+	{VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID},
+	{0},
+};
+
+static int pds_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
+			    const struct vdpa_dev_set_config *add_config)
+{
+	return -EOPNOTSUPP;
+}
+
+static void pds_vdpa_dev_del(struct vdpa_mgmt_dev *mdev,
+			     struct vdpa_device *vdpa_dev)
+{
+}
+
+static const struct vdpa_mgmtdev_ops pds_vdpa_mgmt_dev_ops = {
+	.dev_add = pds_vdpa_dev_add,
+	.dev_del = pds_vdpa_dev_del
+};
+
+int pds_vdpa_get_mgmt_info(struct pds_vdpa_aux *vdpa_aux)
+{
+	union pds_core_adminq_cmd cmd = {
+		.vdpa_ident.opcode = PDS_VDPA_CMD_IDENT,
+		.vdpa_ident.vf_id = cpu_to_le16(vdpa_aux->vf_id),
+	};
+	union pds_core_adminq_comp comp = {};
+	struct vdpa_mgmt_dev *mgmt;
+	struct pci_dev *pf_pdev;
+	struct device *pf_dev;
+	struct pci_dev *pdev;
+	dma_addr_t ident_pa;
+	struct device *dev;
+	u16 dev_intrs;
+	u16 max_vqs;
+	int err;
+
+	dev = &vdpa_aux->padev->aux_dev.dev;
+	pdev = vdpa_aux->padev->vf_pdev;
+	mgmt = &vdpa_aux->vdpa_mdev;
+
+	/* Get resource info through the PF's adminq.  It is a block of info,
+	 * so we need to map some memory for PF to make available to the
+	 * firmware for writing the data.
+	 */
+	pf_pdev = pci_physfn(vdpa_aux->padev->vf_pdev);
+	pf_dev = &pf_pdev->dev;
+	ident_pa = dma_map_single(pf_dev, &vdpa_aux->ident,
+				  sizeof(vdpa_aux->ident), DMA_FROM_DEVICE);
+	if (dma_mapping_error(pf_dev, ident_pa)) {
+		dev_err(dev, "Failed to map ident space\n");
+		return -ENOMEM;
+	}
+
+	cmd.vdpa_ident.ident_pa = cpu_to_le64(ident_pa);
+	cmd.vdpa_ident.len = cpu_to_le32(sizeof(vdpa_aux->ident));
+	err = pds_client_adminq_cmd(vdpa_aux->padev, &cmd,
+				    sizeof(cmd.vdpa_ident), &comp, 0);
+	dma_unmap_single(pf_dev, ident_pa,
+			 sizeof(vdpa_aux->ident), DMA_FROM_DEVICE);
+	if (err) {
+		dev_err(dev, "Failed to ident hw, status %d: %pe\n",
+			comp.status, ERR_PTR(err));
+		return err;
+	}
+
+	max_vqs = le16_to_cpu(vdpa_aux->ident.max_vqs);
+	dev_intrs = pci_msix_vec_count(pdev);
+	dev_dbg(dev, "ident.max_vqs %d dev_intrs %d\n", max_vqs, dev_intrs);
+
+	max_vqs = min_t(u16, dev_intrs, max_vqs);
+	mgmt->max_supported_vqs = min_t(u16, PDS_VDPA_MAX_QUEUES, max_vqs);
+	vdpa_aux->nintrs = mgmt->max_supported_vqs;
+
+	mgmt->ops = &pds_vdpa_mgmt_dev_ops;
+	mgmt->id_table = pds_vdpa_id_table;
+	mgmt->device = dev;
+	mgmt->supported_features = le64_to_cpu(vdpa_aux->ident.hw_features);
+	mgmt->config_attr_mask = BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR);
+	mgmt->config_attr_mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);
+
+	err = pci_alloc_irq_vectors(pdev, vdpa_aux->nintrs, vdpa_aux->nintrs,
+				    PCI_IRQ_MSIX);
+	if (err < 0) {
+		dev_err(dev, "Couldn't get %d msix vectors: %pe\n",
+			vdpa_aux->nintrs, ERR_PTR(err));
+		return err;
+	}
+	vdpa_aux->nintrs = err;
+
+	return 0;
+}

drivers/vdpa/pds/vdpa_dev.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright(c) 2023 Advanced Micro Devices, Inc */
+
+#ifndef _VDPA_DEV_H_
+#define _VDPA_DEV_H_
+
+#define PDS_VDPA_MAX_QUEUES	65
+
+struct pds_vdpa_device {
+	struct vdpa_device vdpa_dev;
+	struct pds_vdpa_aux *vdpa_aux;
+};
+
+int pds_vdpa_get_mgmt_info(struct pds_vdpa_aux *vdpa_aux);
+#endif /* _VDPA_DEV_H_ */