[PATCH v2 6/8] vdpa_sim: use kthread worker

[Stefano Garzarella]

Let's use our own kthread to run device jobs.
This allows us more flexibility, especially we can attach the kthread
to the user address space when vDPA uses user's VA.

Signed-off-by: Stefano Garzarella <sgarz...@redhat.com>
---
 drivers/vdpa/vdpa_sim/vdpa_sim.h |  3 ++-
 drivers/vdpa/vdpa_sim/vdpa_sim.c | 17 ++++++++++++-----
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h
index acee20faaf6a..ce83f9130a5d 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
@@ -57,7 +57,8 @@ struct vdpasim_dev_attr {
 struct vdpasim {
        struct vdpa_device vdpa;
        struct vdpasim_virtqueue *vqs;
-       struct work_struct work;
+       struct kthread_worker *worker;
+       struct kthread_work work;
        struct vdpasim_dev_attr dev_attr;
        /* spinlock to synchronize virtqueue state */
        spinlock_t lock;
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index a6ee830efc38..6feb29726c2a 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -11,8 +11,8 @@
 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
+#include <linux/kthread.h>
 #include <linux/slab.h>
-#include <linux/sched.h>
 #include <linux/dma-map-ops.h>
 #include <linux/vringh.h>
 #include <linux/vdpa.h>
@@ -116,7 +116,7 @@ static void vdpasim_do_reset(struct vdpasim *vdpasim)
 static const struct vdpa_config_ops vdpasim_config_ops;
 static const struct vdpa_config_ops vdpasim_batch_config_ops;
 
-static void vdpasim_work_fn(struct work_struct *work)
+static void vdpasim_work_fn(struct kthread_work *work)
 {
        struct vdpasim *vdpasim = container_of(work, struct vdpasim, work);
 
@@ -159,7 +159,13 @@ struct vdpasim *vdpasim_create(struct vdpasim_dev_attr 
*dev_attr,
 
        vdpasim = vdpa_to_sim(vdpa);
        vdpasim->dev_attr = *dev_attr;
-       INIT_WORK(&vdpasim->work, vdpasim_work_fn);
+
+       kthread_init_work(&vdpasim->work, vdpasim_work_fn);
+       vdpasim->worker = kthread_create_worker(0, "vDPA sim worker: %s",
+                                               dev_attr->name);
+       if (IS_ERR(vdpasim->worker))
+               goto err_iommu;
+
        spin_lock_init(&vdpasim->lock);
        spin_lock_init(&vdpasim->iommu_lock);
 
@@ -212,7 +218,7 @@ EXPORT_SYMBOL_GPL(vdpasim_create);
 
 void vdpasim_schedule_work(struct vdpasim *vdpasim)
 {
-       schedule_work(&vdpasim->work);
+       kthread_queue_work(vdpasim->worker, &vdpasim->work);
 }
 EXPORT_SYMBOL_GPL(vdpasim_schedule_work);
 
@@ -612,7 +618,8 @@ static void vdpasim_free(struct vdpa_device *vdpa)
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        int i;
 
-       cancel_work_sync(&vdpasim->work);
+       kthread_cancel_work_sync(&vdpasim->work);
+       kthread_destroy_worker(vdpasim->worker);
 
        for (i = 0; i < vdpasim->dev_attr.nvqs; i++) {
                vringh_kiov_cleanup(&vdpasim->vqs[i].out_iov);
-- 
2.39.2

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