netdev - [PATCH v3 virtio 4/8] pds_vdpa: virtio bar setup for vdpa

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Message-ID: <20230322191038.44037-5-shannon.nelson@amd.com>
Date:   Wed, 22 Mar 2023 12:10:34 -0700
From:   Shannon Nelson <shannon.nelson@....com>
To:     <jasowang@...hat.com>, <mst@...hat.com>,
        <virtualization@...ts.linux-foundation.org>,
        <shannon.nelson@....com>, <brett.creeley@....com>,
        <davem@...emloft.net>, <netdev@...r.kernel.org>, <kuba@...nel.org>
CC:     <drivers@...sando.io>
Subject: [PATCH v3 virtio 4/8] pds_vdpa: virtio bar setup for vdpa

Prep and use the "modern" virtio bar utilities to get our
virtio config space ready.

Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 drivers/vdpa/pds/aux_drv.c | 25 +++++++++++++++++++++++++
 drivers/vdpa/pds/aux_drv.h |  3 +++
 2 files changed, 28 insertions(+)

diff --git a/drivers/vdpa/pds/aux_drv.c b/drivers/vdpa/pds/aux_drv.c
index 881acd869a9d..8f3ae3326885 100644
--- a/drivers/vdpa/pds/aux_drv.c
+++ b/drivers/vdpa/pds/aux_drv.c
@@ -4,6 +4,7 @@
 #include <linux/auxiliary_bus.h>
 #include <linux/pci.h>
 #include <linux/vdpa.h>
+#include <linux/virtio_pci_modern.h>
 
 #include <linux/pds/pds_common.h>
 #include <linux/pds/pds_core_if.h>
@@ -20,12 +21,22 @@ static const struct auxiliary_device_id pds_vdpa_id_table[] = {
 	{},
 };
 
+static int pds_vdpa_device_id_check(struct pci_dev *pdev)
+{
+	if (pdev->device != PCI_DEVICE_ID_PENSANDO_VDPA_VF ||
+	    pdev->vendor != PCI_VENDOR_ID_PENSANDO)
+		return -ENODEV;
+
+	return 0;
+}
+
 static int pds_vdpa_probe(struct auxiliary_device *aux_dev,
 			  const struct auxiliary_device_id *id)
 
 {
 	struct pds_auxiliary_dev *padev =
 		container_of(aux_dev, struct pds_auxiliary_dev, aux_dev);
+	struct device *dev = &aux_dev->dev;
 	struct pds_vdpa_aux *vdpa_aux;
 	int err;
 
@@ -42,8 +53,21 @@ static int pds_vdpa_probe(struct auxiliary_device *aux_dev,
 	if (err)
 		goto err_free_mem;
 
+	/* Find the virtio configuration */
+	vdpa_aux->vd_mdev.pci_dev = padev->vf_pdev;
+	vdpa_aux->vd_mdev.device_id_check_override = pds_vdpa_device_id_check;
+	vdpa_aux->vd_mdev.dma_mask_override = DMA_BIT_MASK(PDS_CORE_ADDR_LEN);
+	err = vp_modern_probe(&vdpa_aux->vd_mdev);
+	if (err) {
+		dev_err(dev, "Unable to probe for virtio configuration: %pe\n",
+			ERR_PTR(err));
+		goto err_free_mgmt_info;
+	}
+
 	return 0;
 
+err_free_mgmt_info:
+	pci_free_irq_vectors(padev->vf_pdev);
 err_free_mem:
 	kfree(vdpa_aux);
 	auxiliary_set_drvdata(aux_dev, NULL);
@@ -56,6 +80,7 @@ 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;
 
+	vp_modern_remove(&vdpa_aux->vd_mdev);
 	pci_free_irq_vectors(vdpa_aux->padev->vf_pdev);
 
 	kfree(vdpa_aux);
diff --git a/drivers/vdpa/pds/aux_drv.h b/drivers/vdpa/pds/aux_drv.h
index 94ba7abcaa43..8f5140401573 100644
--- a/drivers/vdpa/pds/aux_drv.h
+++ b/drivers/vdpa/pds/aux_drv.h
@@ -4,6 +4,8 @@
 #ifndef _AUX_DRV_H_
 #define _AUX_DRV_H_
 
+#include <linux/virtio_pci_modern.h>
+
 #define PDS_VDPA_DRV_DESCRIPTION    "AMD/Pensando vDPA VF Device Driver"
 #define PDS_VDPA_DRV_NAME           "pds_vdpa"
 
@@ -16,6 +18,7 @@ struct pds_vdpa_aux {
 
 	int vf_id;
 	struct dentry *dentry;
+	struct virtio_pci_modern_device vd_mdev;
 
 	int nintrs;
 };
-- 
2.17.1