This patch factors out IOTLB into a dedicated module in order to be
reused by other modules like vringh. User may choose to enable the
automatic retiring by specifying VHOST_IOTLB_FLAG_RETIRE flag to fit
for the case of vhost device IOTLB implementation.
Signed-off-by: Jason Wang
---
MAINTAINERS | 1 +
drivers/vhost/Kconfig | 7 ++
drivers/vhost/Makefile | 2 +
drivers/vhost/net.c | 2 +-
drivers/vhost/vhost.c | 221 +++-
drivers/vhost/vhost.h | 36 ++
drivers/vhost/vhost_iotlb.c | 171
include/linux/vhost_iotlb.h | 45
8 files changed, 304 insertions(+), 181 deletions(-)
create mode 100644 drivers/vhost/vhost_iotlb.c
create mode 100644 include/linux/vhost_iotlb.h
diff --git a/MAINTAINERS b/MAINTAINERS
index c74e4ea714a5..0fb645b5a7df 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17768,6 +17768,7 @@ T: git
git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git
S: Maintained
F: drivers/vhost/
F: include/uapi/linux/vhost.h
+F: include/linux/vhost_iotlb.h
VIRTIO INPUT DRIVER
M: Gerd Hoffmann
diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
index 3d03ccbd1adc..eef634ff9a6e 100644
--- a/drivers/vhost/Kconfig
+++ b/drivers/vhost/Kconfig
@@ -36,6 +36,7 @@ config VHOST_VSOCK
config VHOST
tristate
+ select VHOST_IOTLB
---help---
This option is selected by any driver which needs to access
the core of vhost.
@@ -54,3 +55,9 @@ config VHOST_CROSS_ENDIAN_LEGACY
adds some overhead, it is disabled by default.
If unsure, say "N".
+
+config VHOST_IOTLB
+ tristate
+ default m
+ help
+ Generic IOTLB implementation for vhost and vringh.
diff --git a/drivers/vhost/Makefile b/drivers/vhost/Makefile
index 6c6df24f770c..df99756fbb26 100644
--- a/drivers/vhost/Makefile
+++ b/drivers/vhost/Makefile
@@ -11,3 +11,5 @@ vhost_vsock-y := vsock.o
obj-$(CONFIG_VHOST_RING) += vringh.o
obj-$(CONFIG_VHOST)+= vhost.o
+
+obj-$(CONFIG_VHOST_IOTLB) += vhost_iotlb.o
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index e158159671fa..e4a20d7a2921 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -1594,7 +1594,7 @@ static long vhost_net_reset_owner(struct vhost_net *n)
struct socket *tx_sock = NULL;
struct socket *rx_sock = NULL;
long err;
- struct vhost_umem *umem;
+ struct vhost_iotlb *umem;
mutex_lock(&n->dev.mutex);
err = vhost_dev_check_owner(&n->dev);
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index f44340b41494..9059b95cac83 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -50,10 +50,6 @@ enum {
#define vhost_used_event(vq) ((__virtio16 __user *)&vq->avail->ring[vq->num])
#define vhost_avail_event(vq) ((__virtio16 __user *)&vq->used->ring[vq->num])
-INTERVAL_TREE_DEFINE(struct vhost_umem_node,
-rb, __u64, __subtree_last,
-START, LAST, static inline, vhost_umem_interval_tree);
-
#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
static void vhost_disable_cross_endian(struct vhost_virtqueue *vq)
{
@@ -581,21 +577,25 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
}
EXPORT_SYMBOL_GPL(vhost_dev_set_owner);
-struct vhost_umem *vhost_dev_reset_owner_prepare(void)
+static struct vhost_iotlb *iotlb_alloc(void)
+{
+ return vhost_iotlb_alloc(max_iotlb_entries,
+VHOST_IOTLB_FLAG_RETIRE);
+}
+
+struct vhost_iotlb *vhost_dev_reset_owner_prepare(void)
{
- return kvzalloc(sizeof(struct vhost_umem), GFP_KERNEL);
+ return iotlb_alloc();
}
EXPORT_SYMBOL_GPL(vhost_dev_reset_owner_prepare);
/* Caller should have device mutex */
-void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_umem *umem)
+void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_iotlb *umem)
{
int i;
vhost_dev_cleanup(dev);
- /* Restore memory to default empty mapping. */
- INIT_LIST_HEAD(&umem->umem_list);
dev->umem = umem;
/* We don't need VQ locks below since vhost_dev_cleanup makes sure
* VQs aren't running.
@@ -618,28 +618,6 @@ void vhost_dev_stop(struct vhost_dev *dev)
}
EXPORT_SYMBOL_GPL(vhost_dev_stop);
-static void vhost_umem_free(struct vhost_umem *umem,
- struct vhost_umem_node *node)
-{
- vhost_umem_interval_tree_remove(node, &umem->umem_tree);
- list_del(&node->link);
- kfree(node);
- umem->numem--;
-}
-
-static void vhost_umem_clean(struct vhost_umem *umem)
-{
- struct vhost_umem_node *node, *tmp;
-
- if (!umem)
- return;
-
- list_for_each_entry_safe(node, tmp, &umem->umem_list, link)
- vhost_umem_free(umem, node);
-
- kvfree(umem);
-}
-
static void vhost_clear_msg(struct vhost_dev *dev)
{
struct vhost_msg_n
