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

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Date:   Fri, 21 May 2021 17:20:07 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     alex.williamson@...hat.com, kwankhede@...dia.com,
        tglx@...utronix.de, vkoul@...nel.org, jgg@...lanox.com
Cc:     megha.dey@...el.com, jacob.jun.pan@...el.com, ashok.raj@...el.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,
        pbonzini@...hat.com, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH v6 10/20] 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  |    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;