[PATCH v6 10/20] vfio/mdev: idxd: add mdev type as a new wq type

Dave Jiang
2021-05-22T00:20:34Z

Add "mdev" wq type and support helpers. The mdev wq type marks the wq
to be utilized as a VFIO mediated device.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
drivers/dma/idxd/idxd.h | 6 ++++++
drivers/dma/idxd/sysfs.c | 5 +++++
2 files changed, 11 insertions(+)

diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index 34ffa6dad53a..cbb046c2921f 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -129,6 +129,7 @@ enum idxd_wq_type {
IDXD_WQT_NONE = 0,
IDXD_WQT_KERNEL,
IDXD_WQT_USER,
+ IDXD_WQT_MDEV,
};

struct idxd_cdev {
@@ -424,6 +425,11 @@ static inline bool is_idxd_wq_user(struct idxd_wq *wq)
return wq->type == IDXD_WQT_USER;
}

+static inline bool is_idxd_wq_mdev(struct idxd_wq *wq)
+{
+ return (wq->type == IDXD_WQT_MDEV);
+}
+
static inline bool wq_dedicated(struct idxd_wq *wq)
{
return test_bit(WQ_FLAG_DEDICATED, &wq->flags);
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index 6583c9c2e992..3d3a84be2c9b 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -17,6 +17,7 @@ static char *idxd_wq_type_names[] = {
[IDXD_WQT_NONE] = "none",
[IDXD_WQT_KERNEL] = "kernel",
[IDXD_WQT_USER] = "user",
+ [IDXD_WQT_MDEV] = "mdev",
};

static bool is_idxd_dev_drv(struct device_driver *drv)
@@ -860,6 +861,8 @@ static ssize_t wq_type_show(struct device *dev,
return sysfs_emit(buf, "%s\n", idxd_wq_type_names[IDXD_WQT_KERNEL]);
case IDXD_WQT_USER:
return sysfs_emit(buf, "%s\n", idxd_wq_type_names[IDXD_WQT_USER]);
+ case IDXD_WQT_MDEV:
+ return sysfs_emit(buf, "%s\n", idxd_wq_type_names[IDXD_WQT_MDEV]);
case IDXD_WQT_NONE:
default:
return sysfs_emit(buf, "%s\n", idxd_wq_type_names[IDXD_WQT_NONE]);
@@ -885,6 +888,8 @@ static ssize_t wq_type_store(struct device *dev,
wq->type = IDXD_WQT_KERNEL;
else if (sysfs_streq(buf, idxd_wq_type_names[IDXD_WQT_USER]))
wq->type = IDXD_WQT_USER;
+ else if (sysfs_streq(buf, idxd_wq_type_names[IDXD_WQT_MDEV]))
+ wq->type = IDXD_WQT_MDEV;
else
return -EINVAL;