linux-kernel - [PATCH v5 06/14] vfio/mdev: idxd: add mdev type as a new wq type

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Message-ID: <161255841136.339900.9537818102228577552.stgit@djiang5-desk3.ch.intel.com>
Date:   Fri, 05 Feb 2021 13:53:31 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     alex.williamson@...hat.com, kwankhede@...dia.com,
        tglx@...utronix.de, vkoul@...nel.org
Cc:     megha.dey@...el.com, jacob.jun.pan@...el.com, ashok.raj@...el.com,
        jgg@...lanox.com, yi.l.liu@...el.com, baolu.lu@...el.com,
        kevin.tian@...el.com, sanjay.k.kumar@...el.com,
        tony.luck@...el.com, dan.j.williams@...el.com,
        eric.auger@...hat.com, parav@...lanox.com, netanelg@...lanox.com,
        shahafs@...lanox.com, pbonzini@...hat.com,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: [PATCH v5 06/14] vfio/mdev: idxd: add mdev type as a new wq type

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@...el.com>
---
 drivers/dma/idxd/idxd.h  |    2 ++
 drivers/dma/idxd/sysfs.c |   13 +++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index a271942df2be..67428c8d476d 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -73,6 +73,7 @@ enum idxd_wq_type {
 	IDXD_WQT_NONE = 0,
 	IDXD_WQT_KERNEL,
 	IDXD_WQT_USER,
+	IDXD_WQT_MDEV,
 };
 
 struct idxd_cdev {
@@ -344,6 +345,7 @@ void idxd_cleanup_sysfs(struct idxd_device *idxd);
 int idxd_register_driver(void);
 void idxd_unregister_driver(void);
 struct bus_type *idxd_get_bus_type(struct idxd_device *idxd);
+bool is_idxd_wq_mdev(struct idxd_wq *wq);
 
 /* device interrupt control */
 irqreturn_t idxd_irq_handler(int vec, void *data);
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index ab5c76e1226b..13d20cbd4cf6 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -14,6 +14,7 @@ static char *idxd_wq_type_names[] = {
 	[IDXD_WQT_NONE]		= "none",
 	[IDXD_WQT_KERNEL]	= "kernel",
 	[IDXD_WQT_USER]		= "user",
+	[IDXD_WQT_MDEV]		= "mdev",
 };
 
 static void idxd_conf_device_release(struct device *dev)
@@ -79,6 +80,11 @@ static inline bool is_idxd_wq_cdev(struct idxd_wq *wq)
 	return wq->type == IDXD_WQT_USER;
 }
 
+inline bool is_idxd_wq_mdev(struct idxd_wq *wq)
+{
+	return wq->type == IDXD_WQT_MDEV ? true : false;
+}
+
 static int idxd_config_bus_match(struct device *dev,
 				 struct device_driver *drv)
 {
@@ -1151,8 +1157,9 @@ static ssize_t wq_type_show(struct device *dev,
 		return sprintf(buf, "%s\n",
 			       idxd_wq_type_names[IDXD_WQT_KERNEL]);
 	case IDXD_WQT_USER:
-		return sprintf(buf, "%s\n",
-			       idxd_wq_type_names[IDXD_WQT_USER]);
+		return sprintf(buf, "%s\n", idxd_wq_type_names[IDXD_WQT_USER]);
+	case IDXD_WQT_MDEV:
+		return sprintf(buf, "%s\n", idxd_wq_type_names[IDXD_WQT_MDEV]);
 	case IDXD_WQT_NONE:
 	default:
 		return sprintf(buf, "%s\n",
@@ -1179,6 +1186,8 @@ 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;