[PATCH v2 06/16] dmaengine: idxd: add per DSA wq workqueue for processing cr faults

Fenghua Yu
2023-03-06T16:46:11Z

Add a workqueue for user submitted completion record fault processing.
The workqueue creation and destruction lifetime will be tied to the user
sub-driver since it will only be used when the wq is a user type.

Tested-by: Tony Zhu <tony.zhu@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
drivers/dma/idxd/cdev.c | 11 +++++++++++
drivers/dma/idxd/idxd.h | 1 +
2 files changed, 12 insertions(+)

diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c
index 674bfefca088..cbe29e1a6a44 100644
--- a/drivers/dma/idxd/cdev.c
+++ b/drivers/dma/idxd/cdev.c
@@ -330,6 +330,13 @@ static int idxd_user_drv_probe(struct idxd_dev *idxd_dev)
}

mutex_lock(&wq->wq_lock);
+
+ wq->wq = create_workqueue(dev_name(wq_confdev(wq)));
+ if (!wq->wq) {
+ rc = -ENOMEM;
+ goto wq_err;
+ }
+
wq->type = IDXD_WQT_USER;
rc = drv_enable_wq(wq);
if (rc < 0)
@@ -348,7 +355,9 @@ static int idxd_user_drv_probe(struct idxd_dev *idxd_dev)
err_cdev:
drv_disable_wq(wq);
err:
+ destroy_workqueue(wq->wq);
wq->type = IDXD_WQT_NONE;
+wq_err:
mutex_unlock(&wq->wq_lock);
return rc;
}
@@ -361,6 +370,8 @@ static void idxd_user_drv_remove(struct idxd_dev *idxd_dev)
idxd_wq_del_cdev(wq);
drv_disable_wq(wq);
wq->type = IDXD_WQT_NONE;
+ destroy_workqueue(wq->wq);
+ wq->wq = NULL;
mutex_unlock(&wq->wq_lock);
}

diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index b923b90b7299..6e56361ae658 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -185,6 +185,7 @@ struct idxd_wq {
struct idxd_dev idxd_dev;
struct idxd_cdev *idxd_cdev;
struct wait_queue_head err_queue;
+ struct workqueue_struct *wq;
struct idxd_device *idxd;
int id;
struct idxd_irq_entry ie;
--
2.37.1