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authorOleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>2018-07-20 12:01:48 +0300
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2018-07-26 23:05:14 -0400
commit932d6562179efe8e2460a0343dbe0fcacf288a9e (patch)
treeedaf27dad5042f971a9f098ca7c6217132e4d08c /drivers/xen/gntdev.c
parent1d314567553883d9f606cc59e8e66f465a4b6ccd (diff)
downloadlinux-932d6562179efe8e2460a0343dbe0fcacf288a9e.tar.bz2
xen/gntdev: Add initial support for dma-buf UAPI
Add UAPI and IOCTLs for dma-buf grant device driver extension: the extension allows userspace processes and kernel modules to use Xen backed dma-buf implementation. With this extension grant references to the pages of an imported dma-buf can be exported for other domain use and grant references coming from a foreign domain can be converted into a local dma-buf for local export. Implement basic initialization and stubs for Xen DMA buffers' support. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen/gntdev.c')
-rw-r--r--drivers/xen/gntdev.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index e03f50052f3e..c866a62f766d 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -48,6 +48,9 @@
#include <asm/xen/hypercall.h>
#include "gntdev-common.h"
+#ifdef CONFIG_XEN_GNTDEV_DMABUF
+#include "gntdev-dmabuf.h"
+#endif
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Derek G. Murray <Derek.Murray@cl.cam.ac.uk>, "
@@ -566,6 +569,15 @@ static int gntdev_open(struct inode *inode, struct file *flip)
INIT_LIST_HEAD(&priv->freeable_maps);
mutex_init(&priv->lock);
+#ifdef CONFIG_XEN_GNTDEV_DMABUF
+ priv->dmabuf_priv = gntdev_dmabuf_init();
+ if (IS_ERR(priv->dmabuf_priv)) {
+ ret = PTR_ERR(priv->dmabuf_priv);
+ kfree(priv);
+ return ret;
+ }
+#endif
+
if (use_ptemod) {
priv->mm = get_task_mm(current);
if (!priv->mm) {
@@ -616,8 +628,13 @@ static int gntdev_release(struct inode *inode, struct file *flip)
WARN_ON(!list_empty(&priv->freeable_maps));
mutex_unlock(&priv->lock);
+#ifdef CONFIG_XEN_GNTDEV_DMABUF
+ gntdev_dmabuf_fini(priv->dmabuf_priv);
+#endif
+
if (use_ptemod)
mmu_notifier_unregister(&priv->mn, priv->mm);
+
kfree(priv);
return 0;
}
@@ -1009,6 +1026,20 @@ static long gntdev_ioctl(struct file *flip,
case IOCTL_GNTDEV_GRANT_COPY:
return gntdev_ioctl_grant_copy(priv, ptr);
+#ifdef CONFIG_XEN_GNTDEV_DMABUF
+ case IOCTL_GNTDEV_DMABUF_EXP_FROM_REFS:
+ return gntdev_ioctl_dmabuf_exp_from_refs(priv, use_ptemod, ptr);
+
+ case IOCTL_GNTDEV_DMABUF_EXP_WAIT_RELEASED:
+ return gntdev_ioctl_dmabuf_exp_wait_released(priv, ptr);
+
+ case IOCTL_GNTDEV_DMABUF_IMP_TO_REFS:
+ return gntdev_ioctl_dmabuf_imp_to_refs(priv, ptr);
+
+ case IOCTL_GNTDEV_DMABUF_IMP_RELEASE:
+ return gntdev_ioctl_dmabuf_imp_release(priv, ptr);
+#endif
+
default:
pr_debug("priv %p, unknown cmd %x\n", priv, cmd);
return -ENOIOCTLCMD;