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-rw-r--r--MAINTAINERS1
-rw-r--r--drivers/virtio/Kconfig2
-rw-r--r--drivers/virtio/Makefile1
-rw-r--r--drivers/virtio/vdpa/Kconfig7
-rw-r--r--drivers/virtio/vdpa/Makefile2
-rw-r--r--drivers/virtio/vdpa/vdpa.c180
-rw-r--r--include/linux/vdpa.h253
7 files changed, 446 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index 19363ed5e723..70c47bc55343 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17699,6 +17699,7 @@ F: tools/virtio/
F: drivers/net/virtio_net.c
F: drivers/block/virtio_blk.c
F: include/linux/virtio*.h
+F: include/linux/vdpa.h
F: include/uapi/linux/virtio_*.h
F: drivers/crypto/virtio/
F: mm/balloon_compaction.c
diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
index 078615cf2afc..9c4fdb64d9ac 100644
--- a/drivers/virtio/Kconfig
+++ b/drivers/virtio/Kconfig
@@ -96,3 +96,5 @@ config VIRTIO_MMIO_CMDLINE_DEVICES
If unsure, say 'N'.
endif # VIRTIO_MENU
+
+source "drivers/virtio/vdpa/Kconfig"
diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile
index 3a2b5c5dcf46..fdf5eacd0d0a 100644
--- a/drivers/virtio/Makefile
+++ b/drivers/virtio/Makefile
@@ -6,3 +6,4 @@ virtio_pci-y := virtio_pci_modern.o virtio_pci_common.o
virtio_pci-$(CONFIG_VIRTIO_PCI_LEGACY) += virtio_pci_legacy.o
obj-$(CONFIG_VIRTIO_BALLOON) += virtio_balloon.o
obj-$(CONFIG_VIRTIO_INPUT) += virtio_input.o
+obj-$(CONFIG_VDPA) += vdpa/
diff --git a/drivers/virtio/vdpa/Kconfig b/drivers/virtio/vdpa/Kconfig
new file mode 100644
index 000000000000..351617723d12
--- /dev/null
+++ b/drivers/virtio/vdpa/Kconfig
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config VDPA
+ tristate
+ help
+ Enable this module to support vDPA device that uses a
+ datapath which complies with virtio specifications with
+ vendor specific control path.
diff --git a/drivers/virtio/vdpa/Makefile b/drivers/virtio/vdpa/Makefile
new file mode 100644
index 000000000000..ee6a35e8a4fb
--- /dev/null
+++ b/drivers/virtio/vdpa/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_VDPA) += vdpa.o
diff --git a/drivers/virtio/vdpa/vdpa.c b/drivers/virtio/vdpa/vdpa.c
new file mode 100644
index 000000000000..e9ed6a2b635b
--- /dev/null
+++ b/drivers/virtio/vdpa/vdpa.c
@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * vDPA bus.
+ *
+ * Copyright (c) 2020, Red Hat. All rights reserved.
+ * Author: Jason Wang <jasowang@redhat.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/idr.h>
+#include <linux/slab.h>
+#include <linux/vdpa.h>
+
+static DEFINE_IDA(vdpa_index_ida);
+
+static int vdpa_dev_probe(struct device *d)
+{
+ struct vdpa_device *vdev = dev_to_vdpa(d);
+ struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver);
+ int ret = 0;
+
+ if (drv && drv->probe)
+ ret = drv->probe(vdev);
+
+ return ret;
+}
+
+static int vdpa_dev_remove(struct device *d)
+{
+ struct vdpa_device *vdev = dev_to_vdpa(d);
+ struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver);
+
+ if (drv && drv->remove)
+ drv->remove(vdev);
+
+ return 0;
+}
+
+static struct bus_type vdpa_bus = {
+ .name = "vdpa",
+ .probe = vdpa_dev_probe,
+ .remove = vdpa_dev_remove,
+};
+
+static void vdpa_release_dev(struct device *d)
+{
+ struct vdpa_device *vdev = dev_to_vdpa(d);
+ const struct vdpa_config_ops *ops = vdev->config;
+
+ if (ops->free)
+ ops->free(vdev);
+
+ ida_simple_remove(&vdpa_index_ida, vdev->index);
+ kfree(vdev);
+}
+
+/**
+ * __vdpa_alloc_device - allocate and initilaize a vDPA device
+ * This allows driver to some prepartion after device is
+ * initialized but before registered.
+ * @parent: the parent device
+ * @config: the bus operations that is supported by this device
+ * @size: size of the parent structure that contains private data
+ *
+ * Drvier should use vdap_alloc_device() wrapper macro instead of
+ * using this directly.
+ *
+ * Returns an error when parent/config/dma_dev is not set or fail to get
+ * ida.
+ */
+struct vdpa_device *__vdpa_alloc_device(struct device *parent,
+ const struct vdpa_config_ops *config,
+ size_t size)
+{
+ struct vdpa_device *vdev;
+ int err = -EINVAL;
+
+ if (!config)
+ goto err;
+
+ if (!!config->dma_map != !!config->dma_unmap)
+ goto err;
+
+ err = -ENOMEM;
+ vdev = kzalloc(size, GFP_KERNEL);
+ if (!vdev)
+ goto err;
+
+ err = ida_simple_get(&vdpa_index_ida, 0, 0, GFP_KERNEL);
+ if (err < 0)
+ goto err_ida;
+
+ vdev->dev.bus = &vdpa_bus;
+ vdev->dev.parent = parent;
+ vdev->dev.release = vdpa_release_dev;
+ vdev->index = err;
+ vdev->config = config;
+
+ err = dev_set_name(&vdev->dev, "vdpa%u", vdev->index);
+ if (err)
+ goto err_name;
+
+ device_initialize(&vdev->dev);
+
+ return vdev;
+
+err_name:
+ ida_simple_remove(&vdpa_index_ida, vdev->index);
+err_ida:
+ kfree(vdev);
+err:
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(__vdpa_alloc_device);
+
+/**
+ * vdpa_register_device - register a vDPA device
+ * Callers must have a succeed call of vdpa_init_device() before.
+ * @vdev: the vdpa device to be registered to vDPA bus
+ *
+ * Returns an error when fail to add to vDPA bus
+ */
+int vdpa_register_device(struct vdpa_device *vdev)
+{
+ return device_add(&vdev->dev);
+}
+EXPORT_SYMBOL_GPL(vdpa_register_device);
+
+/**
+ * vdpa_unregister_device - unregister a vDPA device
+ * @vdev: the vdpa device to be unregisted from vDPA bus
+ */
+void vdpa_unregister_device(struct vdpa_device *vdev)
+{
+ device_unregister(&vdev->dev);
+}
+EXPORT_SYMBOL_GPL(vdpa_unregister_device);
+
+/**
+ * __vdpa_register_driver - register a vDPA device driver
+ * @drv: the vdpa device driver to be registered
+ * @owner: module owner of the driver
+ *
+ * Returns an err when fail to do the registration
+ */
+int __vdpa_register_driver(struct vdpa_driver *drv, struct module *owner)
+{
+ drv->driver.bus = &vdpa_bus;
+ drv->driver.owner = owner;
+
+ return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(__vdpa_register_driver);
+
+/**
+ * vdpa_unregister_driver - unregister a vDPA device driver
+ * @drv: the vdpa device driver to be unregistered
+ */
+void vdpa_unregister_driver(struct vdpa_driver *drv)
+{
+ driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(vdpa_unregister_driver);
+
+static int vdpa_init(void)
+{
+ return bus_register(&vdpa_bus);
+}
+
+static void __exit vdpa_exit(void)
+{
+ bus_unregister(&vdpa_bus);
+ ida_destroy(&vdpa_index_ida);
+}
+core_initcall(vdpa_init);
+module_exit(vdpa_exit);
+
+MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
new file mode 100644
index 000000000000..733acfb7ef84
--- /dev/null
+++ b/include/linux/vdpa.h
@@ -0,0 +1,253 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_VDPA_H
+#define _LINUX_VDPA_H
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/vhost_iotlb.h>
+
+/**
+ * vDPA callback definition.
+ * @callback: interrupt callback function
+ * @private: the data passed to the callback function
+ */
+struct vdpa_callback {
+ irqreturn_t (*callback)(void *data);
+ void *private;
+};
+
+/**
+ * vDPA device - representation of a vDPA device
+ * @dev: underlying device
+ * @dma_dev: the actual device that is performing DMA
+ * @config: the configuration ops for this device.
+ * @index: device index
+ */
+struct vdpa_device {
+ struct device dev;
+ struct device *dma_dev;
+ const struct vdpa_config_ops *config;
+ unsigned int index;
+};
+
+/**
+ * vDPA_config_ops - operations for configuring a vDPA device.
+ * Note: vDPA device drivers are required to implement all of the
+ * operations unless it is mentioned to be optional in the following
+ * list.
+ *
+ * @set_vq_address: Set the address of virtqueue
+ * @vdev: vdpa device
+ * @idx: virtqueue index
+ * @desc_area: address of desc area
+ * @driver_area: address of driver area
+ * @device_area: address of device area
+ * Returns integer: success (0) or error (< 0)
+ * @set_vq_num: Set the size of virtqueue
+ * @vdev: vdpa device
+ * @idx: virtqueue index
+ * @num: the size of virtqueue
+ * @kick_vq: Kick the virtqueue
+ * @vdev: vdpa device
+ * @idx: virtqueue index
+ * @set_vq_cb: Set the interrupt callback function for
+ * a virtqueue
+ * @vdev: vdpa device
+ * @idx: virtqueue index
+ * @cb: virtio-vdev interrupt callback structure
+ * @set_vq_ready: Set ready status for a virtqueue
+ * @vdev: vdpa device
+ * @idx: virtqueue index
+ * @ready: ready (true) not ready(false)
+ * @get_vq_ready: Get ready status for a virtqueue
+ * @vdev: vdpa device
+ * @idx: virtqueue index
+ * Returns boolean: ready (true) or not (false)
+ * @set_vq_state: Set the state for a virtqueue
+ * @vdev: vdpa device
+ * @idx: virtqueue index
+ * @state: virtqueue state (last_avail_idx)
+ * Returns integer: success (0) or error (< 0)
+ * @get_vq_state: Get the state for a virtqueue
+ * @vdev: vdpa device
+ * @idx: virtqueue index
+ * Returns virtqueue state (last_avail_idx)
+ * @get_vq_align: Get the virtqueue align requirement
+ * for the device
+ * @vdev: vdpa device
+ * Returns virtqueue algin requirement
+ * @get_features: Get virtio features supported by the device
+ * @vdev: vdpa device
+ * Returns the virtio features support by the
+ * device
+ * @set_features: Set virtio features supported by the driver
+ * @vdev: vdpa device
+ * @features: feature support by the driver
+ * Returns integer: success (0) or error (< 0)
+ * @set_config_cb: Set the config interrupt callback
+ * @vdev: vdpa device
+ * @cb: virtio-vdev interrupt callback structure
+ * @get_vq_num_max: Get the max size of virtqueue
+ * @vdev: vdpa device
+ * Returns u16: max size of virtqueue
+ * @get_device_id: Get virtio device id
+ * @vdev: vdpa device
+ * Returns u32: virtio device id
+ * @get_vendor_id: Get id for the vendor that provides this device
+ * @vdev: vdpa device
+ * Returns u32: virtio vendor id
+ * @get_status: Get the device status
+ * @vdev: vdpa device
+ * Returns u8: virtio device status
+ * @set_status: Set the device status
+ * @vdev: vdpa device
+ * @status: virtio device status
+ * @get_config: Read from device specific configuration space
+ * @vdev: vdpa device
+ * @offset: offset from the beginning of
+ * configuration space
+ * @buf: buffer used to read to
+ * @len: the length to read from
+ * configuration space
+ * @set_config: Write to device specific configuration space
+ * @vdev: vdpa device
+ * @offset: offset from the beginning of
+ * configuration space
+ * @buf: buffer used to write from
+ * @len: the length to write to
+ * configuration space
+ * @get_generation: Get device config generation (optional)
+ * @vdev: vdpa device
+ * Returns u32: device generation
+ * @set_map: Set device memory mapping (optional)
+ * Needed for device that using device
+ * specific DMA translation (on-chip IOMMU)
+ * @vdev: vdpa device
+ * @iotlb: vhost memory mapping to be
+ * used by the vDPA
+ * Returns integer: success (0) or error (< 0)
+ * @dma_map: Map an area of PA to IOVA (optional)
+ * Needed for device that using device
+ * specific DMA translation (on-chip IOMMU)
+ * and preferring incremental map.
+ * @vdev: vdpa device
+ * @iova: iova to be mapped
+ * @size: size of the area
+ * @pa: physical address for the map
+ * @perm: device access permission (VHOST_MAP_XX)
+ * Returns integer: success (0) or error (< 0)
+ * @dma_unmap: Unmap an area of IOVA (optional but
+ * must be implemented with dma_map)
+ * Needed for device that using device
+ * specific DMA translation (on-chip IOMMU)
+ * and preferring incremental unmap.
+ * @vdev: vdpa device
+ * @iova: iova to be unmapped
+ * @size: size of the area
+ * Returns integer: success (0) or error (< 0)
+ * @free: Free resources that belongs to vDPA (optional)
+ * @vdev: vdpa device
+ */
+struct vdpa_config_ops {
+ /* Virtqueue ops */
+ int (*set_vq_address)(struct vdpa_device *vdev,
+ u16 idx, u64 desc_area, u64 driver_area,
+ u64 device_area);
+ void (*set_vq_num)(struct vdpa_device *vdev, u16 idx, u32 num);
+ void (*kick_vq)(struct vdpa_device *vdev, u16 idx);
+ void (*set_vq_cb)(struct vdpa_device *vdev, u16 idx,
+ struct vdpa_callback *cb);
+ void (*set_vq_ready)(struct vdpa_device *vdev, u16 idx, bool ready);
+ bool (*get_vq_ready)(struct vdpa_device *vdev, u16 idx);
+ int (*set_vq_state)(struct vdpa_device *vdev, u16 idx, u64 state);
+ u64 (*get_vq_state)(struct vdpa_device *vdev, u16 idx);
+
+ /* Device ops */
+ u16 (*get_vq_align)(struct vdpa_device *vdev);
+ u64 (*get_features)(struct vdpa_device *vdev);
+ int (*set_features)(struct vdpa_device *vdev, u64 features);
+ void (*set_config_cb)(struct vdpa_device *vdev,
+ struct vdpa_callback *cb);
+ u16 (*get_vq_num_max)(struct vdpa_device *vdev);
+ u32 (*get_device_id)(struct vdpa_device *vdev);
+ u32 (*get_vendor_id)(struct vdpa_device *vdev);
+ u8 (*get_status)(struct vdpa_device *vdev);
+ void (*set_status)(struct vdpa_device *vdev, u8 status);
+ void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
+ void *buf, unsigned int len);
+ void (*set_config)(struct vdpa_device *vdev, unsigned int offset,
+ const void *buf, unsigned int len);
+ u32 (*get_generation)(struct vdpa_device *vdev);
+
+ /* DMA ops */
+ int (*set_map)(struct vdpa_device *vdev, struct vhost_iotlb *iotlb);
+ int (*dma_map)(struct vdpa_device *vdev, u64 iova, u64 size,
+ u64 pa, u32 perm);
+ int (*dma_unmap)(struct vdpa_device *vdev, u64 iova, u64 size);
+
+ /* Free device resources */
+ void (*free)(struct vdpa_device *vdev);
+};
+
+struct vdpa_device *__vdpa_alloc_device(struct device *parent,
+ const struct vdpa_config_ops *config,
+ size_t size);
+
+#define vdpa_alloc_device(dev_struct, member, parent, config) \
+ container_of(__vdpa_alloc_device( \
+ parent, config, \
+ sizeof(dev_struct) + \
+ BUILD_BUG_ON_ZERO(offsetof( \
+ dev_struct, member))), \
+ dev_struct, member)
+
+int vdpa_register_device(struct vdpa_device *vdev);
+void vdpa_unregister_device(struct vdpa_device *vdev);
+
+/**
+ * vdpa_driver - operations for a vDPA driver
+ * @driver: underlying device driver
+ * @probe: the function to call when a device is found. Returns 0 or -errno.
+ * @remove: the function to call when a device is removed.
+ */
+struct vdpa_driver {
+ struct device_driver driver;
+ int (*probe)(struct vdpa_device *vdev);
+ void (*remove)(struct vdpa_device *vdev);
+};
+
+#define vdpa_register_driver(drv) \
+ __vdpa_register_driver(drv, THIS_MODULE)
+int __vdpa_register_driver(struct vdpa_driver *drv, struct module *owner);
+void vdpa_unregister_driver(struct vdpa_driver *drv);
+
+#define module_vdpa_driver(__vdpa_driver) \
+ module_driver(__vdpa_driver, vdpa_register_driver, \
+ vdpa_unregister_driver)
+
+static inline struct vdpa_driver *drv_to_vdpa(struct device_driver *driver)
+{
+ return container_of(driver, struct vdpa_driver, driver);
+}
+
+static inline struct vdpa_device *dev_to_vdpa(struct device *_dev)
+{
+ return container_of(_dev, struct vdpa_device, dev);
+}
+
+static inline void *vdpa_get_drvdata(const struct vdpa_device *vdev)
+{
+ return dev_get_drvdata(&vdev->dev);
+}
+
+static inline void vdpa_set_drvdata(struct vdpa_device *vdev, void *data)
+{
+ dev_set_drvdata(&vdev->dev, data);
+}
+
+static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev)
+{
+ return vdev->dma_dev;
+}
+#endif /* _LINUX_VDPA_H */
generated by cgit (git 2.34.1) at 2024-06-26 07:40:33 +0000