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Date: Sat, 4 Nov 2023 01:16:34 +0800
From: Cindy Lu <lulu@...hat.com>
To: lulu@...hat.com, jasowang@...hat.com, mst@...hat.com,
yi.l.liu@...el.com, jgg@...dia.com, linux-kernel@...r.kernel.org,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [RFC v1 1/8] vhost/iommufd: Add the functions support iommufd
Add a new file vhost/iommufd.c to support the function of
iommufd, This file contains iommufd function of emulated device and
the physical device.
Signed-off-by: Cindy Lu <lulu@...hat.com>
---
drivers/vhost/iommufd.c | 178 ++++++++++++++++++++++++++++++++++++++++
drivers/vhost/vhost.h | 21 +++++
2 files changed, 199 insertions(+)
create mode 100644 drivers/vhost/iommufd.c
diff --git a/drivers/vhost/iommufd.c b/drivers/vhost/iommufd.c
new file mode 100644
index 000000000000..113dda50a9b6
--- /dev/null
+++ b/drivers/vhost/iommufd.c
@@ -0,0 +1,178 @@
+#include <linux/vdpa.h>
+#include <linux/iommufd.h>
+
+#include "vhost.h"
+
+MODULE_IMPORT_NS(IOMMUFD);
+
+int vdpa_iommufd_bind(struct vdpa_device *vdpa, struct iommufd_ctx *ictx,
+ u32 *ioas_id, u32 *device_id)
+{
+ int ret;
+
+ vhost_vdpa_lockdep_assert_held(vdpa);
+
+ /*
+ * If the driver doesn't provide this op then it means the device does
+ * not do DMA at all. So nothing to do.
+ */
+ if (!vdpa->config->bind_iommufd)
+ return 0;
+ ret = vdpa->config->bind_iommufd(vdpa, ictx, device_id);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+void vdpa_iommufd_unbind(struct vdpa_device *vdpa)
+{
+ vhost_vdpa_lockdep_assert_held(vdpa);
+
+ if (vdpa->config->unbind_iommufd)
+ vdpa->config->unbind_iommufd(vdpa);
+}
+
+int vdpa_iommufd_physical_bind(struct vdpa_device *vdpa,
+ struct iommufd_ctx *ictx, u32 *out_device_id)
+{
+ struct device *dma_dev = vdpa_get_dma_dev(vdpa);
+ struct iommufd_device *idev;
+
+ idev = iommufd_device_bind(ictx, dma_dev, out_device_id);
+ if (IS_ERR(idev))
+ return PTR_ERR(idev);
+ vdpa->iommufd_device = idev;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vdpa_iommufd_physical_bind);
+
+void vdpa_iommufd_physical_unbind(struct vdpa_device *vdpa)
+{
+ vhost_vdpa_lockdep_assert_held(vdpa);
+
+ if (vdpa->iommufd_attached) {
+ iommufd_device_detach(vdpa->iommufd_device);
+ vdpa->iommufd_attached = false;
+ }
+ iommufd_device_unbind(vdpa->iommufd_device);
+ vdpa->iommufd_device = NULL;
+}
+EXPORT_SYMBOL_GPL(vdpa_iommufd_physical_unbind);
+
+int vdpa_iommufd_physical_attach_ioas(struct vdpa_device *vdpa,
+ u32 *iommufd_ioasid)
+{
+ int rc;
+
+ vhost_vdpa_lockdep_assert_held(vdpa);
+
+ if (WARN_ON(!vdpa->iommufd_device))
+ return -EINVAL;
+
+ if (vdpa->iommufd_attached)
+ rc = iommufd_device_replace(vdpa->iommufd_device,
+ iommufd_ioasid);
+ else
+ rc = iommufd_device_attach(vdpa->iommufd_device,
+ iommufd_ioasid);
+ if (rc)
+ return rc;
+ vdpa->iommufd_attached = true;
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(vdpa_iommufd_physical_attach_ioas);
+int vdpa_iommufd_physical_detach_ioas(struct vdpa_device *vdpa)
+{
+ vhost_vdpa_lockdep_assert_held(vdpa);
+
+ if (WARN_ON(!vdpa->iommufd_device) || !vdpa->iommufd_attached)
+ return -1;
+
+ iommufd_device_detach(vdpa->iommufd_device);
+ vdpa->iommufd_attached = false;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vdpa_iommufd_physical_detach_ioas);
+
+static void vdpa_emulated_unmap(void *data, unsigned long iova,
+ unsigned long length)
+{
+ struct vdpa_device *vdpa = data;
+ /* todo: need to unmap the iova-lenth in all ASID*/
+
+ // vdpa->config->dma_unmap(vdpa, 0, iova, length);
+}
+
+static const struct iommufd_access_ops vdpa_user_ops = {
+ .needs_pin_pages = 1,
+ .unmap = vdpa_emulated_unmap,
+};
+
+int vdpa_iommufd_emulated_bind(struct vdpa_device *vdpa,
+ struct iommufd_ctx *ictx, u32 *out_device_id)
+{
+ vhost_vdpa_lockdep_assert_held(vdpa);
+
+ struct iommufd_access *user;
+
+ user = iommufd_access_create(ictx, &vdpa_user_ops, vdpa, out_device_id);
+ if (IS_ERR(user))
+ return PTR_ERR(user);
+ vdpa->iommufd_access = user;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vdpa_iommufd_emulated_bind);
+
+void vdpa_iommufd_emulated_unbind(struct vdpa_device *vdpa)
+{
+ vhost_vdpa_lockdep_assert_held(vdpa);
+
+ if (vdpa->iommufd_access) {
+ iommufd_access_destroy(vdpa->iommufd_access);
+ vdpa->iommufd_attached = false;
+ vdpa->iommufd_access = NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(vdpa_iommufd_emulated_unbind);
+
+int vdpa_iommufd_emulated_attach_ioas(struct vdpa_device *vdpa,
+ u32 *iommufd_ioasid)
+{
+ int rc;
+
+ struct iommufd_access *user;
+
+ vhost_vdpa_lockdep_assert_held(vdpa);
+
+ if (vdpa->iommufd_attached) {
+ rc = iommufd_access_replace(vdpa->iommufd_access,
+ *iommufd_ioasid);
+ } else {
+ rc = iommufd_access_attach(vdpa->iommufd_access,
+ *iommufd_ioasid);
+ }
+ user = vdpa->iommufd_access;
+
+ if (rc)
+ return rc;
+ vdpa->iommufd_attached = true;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vdpa_iommufd_emulated_attach_ioas);
+
+int vdpa_iommufd_emulated_detach_ioas(struct vdpa_device *vdpa)
+{
+ vhost_vdpa_lockdep_assert_held(vdpa);
+
+ if (WARN_ON(!vdpa->iommufd_access) || !vdpa->iommufd_attached)
+ return -1;
+
+ iommufd_access_detach(vdpa->iommufd_access);
+ vdpa->iommufd_attached = false;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vdpa_iommufd_emulated_detach_ioas);
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index f60d5f7bef94..179012e350f9 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -310,6 +310,27 @@ static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
}
#endif
+struct iommufd_ctx;
+struct vdpa_device;
+void vhost_vdpa_lockdep_assert_held(struct vdpa_device *vdpa);
+
+#if IS_ENABLED(CONFIG_IOMMUFD)
+int vdpa_iommufd_bind(struct vdpa_device *vdpa, struct iommufd_ctx *ictx,
+ u32 *ioas_id, u32 *device_id);
+void vdpa_iommufd_unbind(struct vdpa_device *vdpa);
+#else
+static inline int vdpa_iommufd_bind(struct vdpa_device *vdpa,
+ struct iommufd_ctx *ictx, u32 *ioas_id,
+ u32 *device_id)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline void vdpa_iommufd_unbind(struct vdpa_device *vdpa)
+{
+}
+#endif
+
/* Memory accessors */
static inline u16 vhost16_to_cpu(struct vhost_virtqueue *vq, __virtio16 val)
{
--
2.34.3
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