diff mbox series

[RFC,v2,16/18] dmaengine: idxd: add new wq state for mdev

Message ID 159534744069.28840.5832146066812507209.stgit@djiang5-desk3.ch.intel.com (mailing list archive)
State Not Applicable, archived
Headers show
Series Add VFIO mediated device support and DEV-MSI support for the idxd driver | expand

Commit Message

Dave Jiang July 21, 2020, 4:04 p.m. UTC 
When a dedicated wq is enabled as mdev, we must disable the wq on the
device in order to program the pasid to the wq. Introduce a wq state
IDXD_WQ_LOCKED that is software state only in order to prevent the user
from modifying the configuration while mdev wq is in this state. While
in this state, the wq is not in DISABLED state and will prevent any
modifications to the configuration. It is also not in the ENABLED state
and therefore prevents any actions allowed in the ENABLED state.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
---
 drivers/dma/idxd/idxd.h  |    1 +
 drivers/dma/idxd/mdev.c  |    4 +++-
 drivers/dma/idxd/sysfs.c |    2 ++
 3 files changed, 6 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index 1f03019bb45d..cc0665335aee 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -60,6 +60,7 @@  struct idxd_group {
 enum idxd_wq_state {
 	IDXD_WQ_DISABLED = 0,
 	IDXD_WQ_ENABLED,
+	IDXD_WQ_LOCKED,
 };
 
 enum idxd_wq_flag {
diff --git a/drivers/dma/idxd/mdev.c b/drivers/dma/idxd/mdev.c
index 744adfdc06cd..e3c32f9566b5 100644
--- a/drivers/dma/idxd/mdev.c
+++ b/drivers/dma/idxd/mdev.c
@@ -69,8 +69,10 @@  static void idxd_vdcm_init(struct vdcm_idxd *vidxd)
 
 	vidxd_mmio_init(vidxd);
 
-	if (wq_dedicated(wq) && wq->state == IDXD_WQ_ENABLED)
+	if (wq_dedicated(wq) && wq->state == IDXD_WQ_ENABLED) {
 		idxd_wq_disable(wq, NULL);
+		wq->state = IDXD_WQ_LOCKED;
+	}
 }
 
 static void __idxd_vdcm_release(struct vdcm_idxd *vidxd)
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index d3b0a95b0d1d..6344cc719897 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -822,6 +822,8 @@  static ssize_t wq_state_show(struct device *dev,
 		return sprintf(buf, "disabled\n");
 	case IDXD_WQ_ENABLED:
 		return sprintf(buf, "enabled\n");
+	case IDXD_WQ_LOCKED:
+		return sprintf(buf, "locked\n");
 	}
 
 	return sprintf(buf, "unknown\n");