linux-kernel - [PATCH v3 4/7] vduse: Add function to get/free the pages for reconnection

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Message-Id: <20231205083444.3029239-5-lulu@redhat.com>
Date:   Tue,  5 Dec 2023 16:34:41 +0800
From:   Cindy Lu <lulu@...hat.com>
To:     lulu@...hat.com, jasowang@...hat.com, mst@...hat.com,
        xieyongji@...edance.com, linux-kernel@...r.kernel.org,
        maxime.coquelin@...hat.com
Subject: [PATCH v3 4/7] vduse: Add function to get/free the pages for reconnection

Add the function vduse_alloc_reconnnect_info_mem
and vduse_alloc_reconnnect_info_mem
These functions allow vduse to allocate and free memory for reconnection
information. The amount of memory allocated is (vq_num + 1) pages.

Page 0 is reserved for saving the dev reconnection information, which
will be maintained by the Userspace App. Pages 1 to vq_num + 1 will be
used to save the reconnection information for vqs.

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 drivers/vdpa/vdpa_user/vduse_dev.c | 64 ++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index dd074a7b4bc7..52ccde636406 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -41,6 +41,7 @@
 #define VDUSE_IOVA_SIZE (128 * 1024 * 1024)
 #define VDUSE_MSG_DEFAULT_TIMEOUT 30
 
+
 struct vduse_virtqueue {
 	u16 index;
 	u16 num_max;
@@ -57,6 +58,7 @@ struct vduse_virtqueue {
 	struct vdpa_callback cb;
 	struct work_struct inject;
 	struct work_struct kick;
+	unsigned long vdpa_reconnect_vaddr;
 };
 
 struct vduse_dev;
@@ -106,6 +108,7 @@ struct vduse_dev {
 	u32 vq_align;
 	struct vduse_umem *umem;
 	struct mutex mem_lock;
+	unsigned long vdpa_reconnect_vaddr;
 };
 
 struct vduse_dev_msg {
@@ -1030,6 +1033,57 @@ static int vduse_dev_reg_umem(struct vduse_dev *dev,
 	return ret;
 }
 
+static int vduse_alloc_reconnnect_info_mem(struct vduse_dev *dev)
+{
+	unsigned long vaddr = 0;
+	struct vduse_virtqueue *vq;
+
+	for (int i = 0; i < dev->vq_num + 1; i++) {
+		if (i == 0) {
+			vaddr = __get_free_pages(
+				GFP_KERNEL | __GFP_ZERO,
+				get_order(VDUSE_RECONNCT_MMAP_SIZE));
+			if (vaddr == 0)
+				return -ENOMEM;
+			dev->vdpa_reconnect_vaddr = vaddr;
+		}
+
+		/*page 1~ vq_num + 1 save the reconnect info for vq*/
+		vq = &dev->vqs[i];
+		vaddr = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
+					 get_order(VDUSE_RECONNCT_MMAP_SIZE));
+		if (vaddr == 0)
+			return -ENOMEM;
+
+		vq->vdpa_reconnect_vaddr = vaddr;
+	}
+
+	return 0;
+}
+
+static int vduse_free_reconnnect_info_mem(struct vduse_dev *dev)
+{
+	struct vduse_virtqueue *vq;
+
+	for (int i = 0; i < dev->vq_num + 1; i++) {
+		if (i == 0) {
+			if (dev->vdpa_reconnect_vaddr)
+				free_pages(dev->vdpa_reconnect_vaddr,
+					   get_order(VDUSE_RECONNCT_MMAP_SIZE));
+			dev->vdpa_reconnect_vaddr = 0;
+		}
+
+		vq = &dev->vqs[i];
+
+		if (vq->vdpa_reconnect_vaddr)
+			free_pages(vq->vdpa_reconnect_vaddr,
+				   get_order(VDUSE_RECONNCT_MMAP_SIZE));
+		vq->vdpa_reconnect_vaddr = 0;
+	}
+
+	return 0;
+}
+
 static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
 			    unsigned long arg)
 {
@@ -1411,6 +1465,8 @@ static int vduse_destroy_dev(char *name)
 		mutex_unlock(&dev->lock);
 		return -EBUSY;
 	}
+	vduse_free_reconnnect_info_mem(dev);
+
 	dev->connected = true;
 	mutex_unlock(&dev->lock);
 
@@ -1563,9 +1619,17 @@ static int vduse_create_dev(struct vduse_dev_config *config,
 		ret = PTR_ERR(dev->dev);
 		goto err_dev;
 	}
+
+	ret = vduse_alloc_reconnnect_info_mem(dev);
+	if (ret < 0)
+		goto err_mem;
+
 	__module_get(THIS_MODULE);
 
 	return 0;
+
+err_mem:
+	vduse_free_reconnnect_info_mem(dev);
 err_dev:
 	idr_remove(&vduse_idr, dev->minor);
 err_idr:
-- 
2.34.3