From: Cindy Lu <lulu@redhat.com>
To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: [PATCH v5 3/5] vduse: Add function to get/free the pages for reconnection
Date: Fri, 12 Apr 2024 21:28:23 +0800 [thread overview]
Message-ID: <20240412133017.483407-4-lulu@redhat.com> (raw)
In-Reply-To: <20240412133017.483407-1-lulu@redhat.com>
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 pages.
Each VQS will map its own page where the reconnection information will be saved
Signed-off-by: Cindy Lu <lulu@redhat.com>
---
drivers/vdpa/vdpa_user/vduse_dev.c | 40 ++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index ef3c9681941e..2da659d5f4a8 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -65,6 +65,7 @@ struct vduse_virtqueue {
int irq_effective_cpu;
struct cpumask irq_affinity;
struct kobject kobj;
+ unsigned long vdpa_reconnect_vaddr;
};
struct vduse_dev;
@@ -1105,6 +1106,38 @@ static void vduse_vq_update_effective_cpu(struct vduse_virtqueue *vq)
vq->irq_effective_cpu = curr_cpu;
}
+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; i++) {
+ /*page 0~ vq_num save the reconnect info for vq*/
+ vq = dev->vqs[i];
+ vaddr = get_zeroed_page(GFP_KERNEL);
+ 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; i++) {
+ vq = dev->vqs[i];
+
+ if (vq->vdpa_reconnect_vaddr)
+ free_page(vq->vdpa_reconnect_vaddr);
+ vq->vdpa_reconnect_vaddr = 0;
+ }
+
+ return 0;
+}
static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
@@ -1672,6 +1705,8 @@ 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);
@@ -1855,12 +1890,17 @@ static int vduse_create_dev(struct vduse_dev_config *config,
ret = vduse_dev_init_vqs(dev, config->vq_align, config->vq_num);
if (ret)
goto err_vqs;
+ ret = vduse_alloc_reconnnect_info_mem(dev);
+ if (ret < 0)
+ goto err_mem;
__module_get(THIS_MODULE);
return 0;
err_vqs:
device_destroy(&vduse_class, MKDEV(MAJOR(vduse_major), dev->minor));
+err_mem:
+ vduse_free_reconnnect_info_mem(dev);
err_dev:
idr_remove(&vduse_idr, dev->minor);
err_idr:
--
2.43.0
next prev parent reply other threads:[~2024-04-12 13:31 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-12 13:28 [PATCH v5 0/5] vduse: Add support for reconnection Cindy Lu
2024-04-12 13:28 ` [PATCH v5 1/5] vduse: Add new ioctl VDUSE_DEV_GET_CONFIG Cindy Lu
2024-04-12 13:28 ` [PATCH v5 2/5] vduse: Add new ioctl VDUSE_DEV_GET_STATUS Cindy Lu
2024-04-12 13:28 ` Cindy Lu [this message]
2024-04-17 9:29 ` [PATCH v5 3/5] vduse: Add function to get/free the pages for reconnection Michael S. Tsirkin
2024-04-18 0:57 ` Jason Wang
2024-04-22 20:05 ` Michael S. Tsirkin
2024-04-23 3:09 ` Jason Wang
2024-04-23 8:42 ` Michael S. Tsirkin
2024-04-24 0:44 ` Jason Wang
2024-04-24 3:14 ` Cindy Lu
2024-04-24 3:51 ` Jason Wang
2024-04-24 9:51 ` Michael S. Tsirkin
2024-04-25 1:35 ` Jason Wang
2024-04-25 10:26 ` Michael S. Tsirkin
2024-04-12 13:28 ` [PATCH v5 4/5] vduse: Add file operation for mmap Cindy Lu
2024-04-12 13:28 ` [PATCH v5 5/5] Documentation: Add reconnect process for VDUSE Cindy Lu
2024-04-16 3:46 ` Jason Wang
2024-04-17 8:46 ` Cindy Lu
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