Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 235 insertions, 0 deletions

diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
new file mode 100644
index 000000000..2257f1b3d
--- /dev/null
+++ b/drivers/virtio/virtio_pci_legacy.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Virtio PCI driver - legacy device support
+ *
+ * This module allows virtio devices to be used over a virtual PCI device.
+ * This can be used with QEMU based VMMs like KVM or Xen.
+ *
+ * Copyright IBM Corp. 2007
+ * Copyright Red Hat, Inc. 2014
+ *
+ * Authors:
+ *  Anthony Liguori  <aliguori@us.ibm.com>
+ *  Rusty Russell <rusty@rustcorp.com.au>
+ *  Michael S. Tsirkin <mst@redhat.com>
+ */
+
+#include "linux/virtio_pci_legacy.h"
+#include "virtio_pci_common.h"
+
+/* virtio config->get_features() implementation */
+static u64 vp_get_features(struct virtio_device *vdev)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+
+	/* When someone needs more than 32 feature bits, we'll need to
+	 * steal a bit to indicate that the rest are somewhere else. */
+	return vp_legacy_get_features(&vp_dev->ldev);
+}
+
+/* virtio config->finalize_features() implementation */
+static int vp_finalize_features(struct virtio_device *vdev)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+
+	/* Give virtio_ring a chance to accept features. */
+	vring_transport_features(vdev);
+
+	/* Make sure we don't have any features > 32 bits! */
+	BUG_ON((u32)vdev->features != vdev->features);
+
+	/* We only support 32 feature bits. */
+	vp_legacy_set_features(&vp_dev->ldev, vdev->features);
+
+	return 0;
+}
+
+/* virtio config->get() implementation */
+static void vp_get(struct virtio_device *vdev, unsigned int offset,
+		   void *buf, unsigned int len)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+	void __iomem *ioaddr = vp_dev->ldev.ioaddr +
+			VIRTIO_PCI_CONFIG_OFF(vp_dev->msix_enabled) +
+			offset;
+	u8 *ptr = buf;
+	int i;
+
+	for (i = 0; i < len; i++)
+		ptr[i] = ioread8(ioaddr + i);
+}
+
+/* the config->set() implementation.  it's symmetric to the config->get()
+ * implementation */
+static void vp_set(struct virtio_device *vdev, unsigned int offset,
+		   const void *buf, unsigned int len)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+	void __iomem *ioaddr = vp_dev->ldev.ioaddr +
+			VIRTIO_PCI_CONFIG_OFF(vp_dev->msix_enabled) +
+			offset;
+	const u8 *ptr = buf;
+	int i;
+
+	for (i = 0; i < len; i++)
+		iowrite8(ptr[i], ioaddr + i);
+}
+
+/* config->{get,set}_status() implementations */
+static u8 vp_get_status(struct virtio_device *vdev)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+	return vp_legacy_get_status(&vp_dev->ldev);
+}
+
+static void vp_set_status(struct virtio_device *vdev, u8 status)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+	/* We should never be setting status to 0. */
+	BUG_ON(status == 0);
+	vp_legacy_set_status(&vp_dev->ldev, status);
+}
+
+static void vp_reset(struct virtio_device *vdev)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+	/* 0 status means a reset. */
+	vp_legacy_set_status(&vp_dev->ldev, 0);
+	/* Flush out the status write, and flush in device writes,
+	 * including MSi-X interrupts, if any. */
+	vp_legacy_get_status(&vp_dev->ldev);
+	/* Flush pending VQ/configuration callbacks. */
+	vp_synchronize_vectors(vdev);
+}
+
+static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
+{
+	return vp_legacy_config_vector(&vp_dev->ldev, vector);
+}
+
+static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
+				  struct virtio_pci_vq_info *info,
+				  unsigned int index,
+				  void (*callback)(struct virtqueue *vq),
+				  const char *name,
+				  bool ctx,
+				  u16 msix_vec)
+{
+	struct virtqueue *vq;
+	u16 num;
+	int err;
+	u64 q_pfn;
+
+	/* Check if queue is either not available or already active. */
+	num = vp_legacy_get_queue_size(&vp_dev->ldev, index);
+	if (!num || vp_legacy_get_queue_enable(&vp_dev->ldev, index))
+		return ERR_PTR(-ENOENT);
+
+	info->msix_vector = msix_vec;
+
+	/* create the vring */
+	vq = vring_create_virtqueue(index, num,
+				    VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
+				    true, false, ctx,
+				    vp_notify, callback, name);
+	if (!vq)
+		return ERR_PTR(-ENOMEM);
+
+	vq->num_max = num;
+
+	q_pfn = virtqueue_get_desc_addr(vq) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
+	if (q_pfn >> 32) {
+		dev_err(&vp_dev->pci_dev->dev,
+			"platform bug: legacy virtio-pci must not be used with RAM above 0x%llxGB\n",
+			0x1ULL << (32 + PAGE_SHIFT - 30));
+		err = -E2BIG;
+		goto out_del_vq;
+	}
+
+	/* activate the queue */
+	vp_legacy_set_queue_address(&vp_dev->ldev, index, q_pfn);
+
+	vq->priv = (void __force *)vp_dev->ldev.ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;
+
+	if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
+		msix_vec = vp_legacy_queue_vector(&vp_dev->ldev, index, msix_vec);
+		if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
+			err = -EBUSY;
+			goto out_deactivate;
+		}
+	}
+
+	return vq;
+
+out_deactivate:
+	vp_legacy_set_queue_address(&vp_dev->ldev, index, 0);
+out_del_vq:
+	vring_del_virtqueue(vq);
+	return ERR_PTR(err);
+}
+
+static void del_vq(struct virtio_pci_vq_info *info)
+{
+	struct virtqueue *vq = info->vq;
+	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
+
+	if (vp_dev->msix_enabled) {
+		vp_legacy_queue_vector(&vp_dev->ldev, vq->index,
+				VIRTIO_MSI_NO_VECTOR);
+		/* Flush the write out to device */
+		ioread8(vp_dev->ldev.ioaddr + VIRTIO_PCI_ISR);
+	}
+
+	/* Select and deactivate the queue */
+	vp_legacy_set_queue_address(&vp_dev->ldev, vq->index, 0);
+
+	vring_del_virtqueue(vq);
+}
+
+static const struct virtio_config_ops virtio_pci_config_ops = {
+	.get		= vp_get,
+	.set		= vp_set,
+	.get_status	= vp_get_status,
+	.set_status	= vp_set_status,
+	.reset		= vp_reset,
+	.find_vqs	= vp_find_vqs,
+	.del_vqs	= vp_del_vqs,
+	.synchronize_cbs = vp_synchronize_vectors,
+	.get_features	= vp_get_features,
+	.finalize_features = vp_finalize_features,
+	.bus_name	= vp_bus_name,
+	.set_vq_affinity = vp_set_vq_affinity,
+	.get_vq_affinity = vp_get_vq_affinity,
+};
+
+/* the PCI probing function */
+int virtio_pci_legacy_probe(struct virtio_pci_device *vp_dev)
+{
+	struct virtio_pci_legacy_device *ldev = &vp_dev->ldev;
+	struct pci_dev *pci_dev = vp_dev->pci_dev;
+	int rc;
+
+	ldev->pci_dev = pci_dev;
+
+	rc = vp_legacy_probe(ldev);
+	if (rc)
+		return rc;
+
+	vp_dev->isr = ldev->isr;
+	vp_dev->vdev.id = ldev->id;
+
+	vp_dev->vdev.config = &virtio_pci_config_ops;
+
+	vp_dev->config_vector = vp_config_vector;
+	vp_dev->setup_vq = setup_vq;
+	vp_dev->del_vq = del_vq;
+
+	return 0;
+}
+
+void virtio_pci_legacy_remove(struct virtio_pci_device *vp_dev)
+{
+	struct virtio_pci_legacy_device *ldev = &vp_dev->ldev;
+
+	vp_legacy_remove(ldev);
+}