dmaengine Archive on lore.kernel.org
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From: Dave Jiang <dave.jiang@intel.com>
To: vkoul@kernel.org, megha.dey@intel.com, maz@kernel.org,
	bhelgaas@google.com, rafael@kernel.org,
	gregkh@linuxfoundation.org, tglx@linutronix.de, hpa@zytor.com,
	alex.williamson@redhat.com, jacob.jun.pan@intel.com,
	ashok.raj@intel.com, jgg@mellanox.com, yi.l.liu@intel.com,
	baolu.lu@intel.com, kevin.tian@intel.com,
	sanjay.k.kumar@intel.com, tony.luck@intel.com,
	jing.lin@intel.com, dan.j.williams@intel.com,
	kwankhede@nvidia.com, eric.auger@redhat.com, parav@mellanox.com,
	jgg@mellanox.com, rafael@kernel.org, dave.hansen@intel.com,
	netanelg@mellanox.com, shahafs@mellanox.com,
	yan.y.zhao@linux.intel.com, pbonzini@redhat.com,
	samuel.ortiz@intel.com, mona.hossain@intel.com
Cc: dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,
	x86@kernel.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH RFC v2 15/18] dmaengine: idxd: add dedicated wq mdev type
Date: Tue, 21 Jul 2020 09:03:53 -0700
Message-ID: <159534743378.28840.14343631681400866758.stgit@djiang5-desk3.ch.intel.com> (raw)
In-Reply-To: <159534667974.28840.2045034360240786644.stgit@djiang5-desk3.ch.intel.com>

Add the support code for "1dwq" mdev type. This mdev type follows the
standard VFIO mdev flow. The "1dwq" type will export a single dedicated wq
to the mdev. The dwq will have read-only configuration that is configured
by the host. The mdev type does not support PASID and SVA and will match
the stage 1 driver in functional support. For backward compatibility, the
mdev will maintain the DSA spec definition of this mdev type once the
commit goes upstream.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
---
 drivers/dma/idxd/mdev.c |  142 ++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 133 insertions(+), 9 deletions(-)

diff --git a/drivers/dma/idxd/mdev.c b/drivers/dma/idxd/mdev.c
index 01207ca42a79..744adfdc06cd 100644
--- a/drivers/dma/idxd/mdev.c
+++ b/drivers/dma/idxd/mdev.c
@@ -113,21 +113,58 @@ static void idxd_vdcm_release_work(struct work_struct *work)
 	__idxd_vdcm_release(vidxd);
 }
 
+static struct idxd_wq *find_any_dwq(struct idxd_device *idxd)
+{
+	int i;
+	struct idxd_wq *wq;
+	unsigned long flags;
+
+	spin_lock_irqsave(&idxd->dev_lock, flags);
+	for (i = 0; i < idxd->max_wqs; i++) {
+		wq = &idxd->wqs[i];
+
+		if (wq->state != IDXD_WQ_ENABLED)
+			continue;
+
+		if (!wq_dedicated(wq))
+			continue;
+
+		if (idxd_wq_refcount(wq) != 0)
+			continue;
+
+		spin_unlock_irqrestore(&idxd->dev_lock, flags);
+		mutex_lock(&wq->wq_lock);
+		if (idxd_wq_refcount(wq)) {
+			spin_lock_irqsave(&idxd->dev_lock, flags);
+			continue;
+		}
+
+		idxd_wq_get(wq);
+		mutex_unlock(&wq->wq_lock);
+		return wq;
+	}
+
+	spin_unlock_irqrestore(&idxd->dev_lock, flags);
+	return NULL;
+}
+
 static struct vdcm_idxd *vdcm_vidxd_create(struct idxd_device *idxd, struct mdev_device *mdev,
 					   struct vdcm_idxd_type *type)
 {
 	struct vdcm_idxd *vidxd;
 	struct idxd_wq *wq = NULL;
-	int i;
-
-	/* PLACEHOLDER, wq matching comes later */
+	int i, rc;
 
+	if (type->type == IDXD_MDEV_TYPE_1_DWQ)
+		wq = find_any_dwq(idxd);
 	if (!wq)
 		return ERR_PTR(-ENODEV);
 
 	vidxd = kzalloc(sizeof(*vidxd), GFP_KERNEL);
-	if (!vidxd)
-		return ERR_PTR(-ENOMEM);
+	if (!vidxd) {
+		rc = -ENOMEM;
+		goto err;
+	}
 
 	mutex_init(&vidxd->dev_lock);
 	vidxd->idxd = idxd;
@@ -142,14 +179,23 @@ static struct vdcm_idxd *vdcm_vidxd_create(struct idxd_device *idxd, struct mdev
 
 	INIT_WORK(&vidxd->vdev.release_work, idxd_vdcm_release_work);
 	idxd_vdcm_init(vidxd);
-	mutex_lock(&wq->wq_lock);
-	idxd_wq_get(wq);
-	mutex_unlock(&wq->wq_lock);
 
 	return vidxd;
+
+ err:
+	mutex_lock(&wq->wq_lock);
+	idxd_wq_put(wq);
+	mutex_unlock(&wq->wq_lock);
+	return ERR_PTR(rc);
 }
 
-static struct vdcm_idxd_type idxd_mdev_types[IDXD_MDEV_TYPES];
+static struct vdcm_idxd_type idxd_mdev_types[IDXD_MDEV_TYPES] = {
+	{
+		.name = "1dwq",
+		.description = "IDXD MDEV with 1 dedicated workqueue",
+		.type = IDXD_MDEV_TYPE_1_DWQ,
+	},
+};
 
 static struct vdcm_idxd_type *idxd_vdcm_find_vidxd_type(struct device *dev,
 							const char *name)
@@ -932,7 +978,85 @@ static long idxd_vdcm_ioctl(struct mdev_device *mdev, unsigned int cmd,
 	return rc;
 }
 
+static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
+{
+	struct vdcm_idxd_type *type;
+
+	type = idxd_vdcm_find_vidxd_type(dev, kobject_name(kobj));
+
+	if (type)
+		return sprintf(buf, "%s\n", type->description);
+
+	return -EINVAL;
+}
+static MDEV_TYPE_ATTR_RO(name);
+
+static int find_available_mdev_instances(struct idxd_device *idxd, struct vdcm_idxd_type *type)
+{
+	int count = 0, i;
+	unsigned long flags;
+
+	if (type->type != IDXD_MDEV_TYPE_1_DWQ)
+		return 0;
+
+	spin_lock_irqsave(&idxd->dev_lock, flags);
+	for (i = 0; i < idxd->max_wqs; i++) {
+		struct idxd_wq *wq;
+
+		wq = &idxd->wqs[i];
+		if (!is_idxd_wq_mdev(wq) || !wq_dedicated(wq) || idxd_wq_refcount(wq))
+			continue;
+
+		count++;
+	}
+	spin_unlock_irqrestore(&idxd->dev_lock, flags);
+
+	return count;
+}
+
+static ssize_t available_instances_show(struct kobject *kobj,
+					struct device *dev, char *buf)
+{
+	int count;
+	struct idxd_device *idxd = dev_get_drvdata(dev);
+	struct vdcm_idxd_type *type;
+
+	type = idxd_vdcm_find_vidxd_type(dev, kobject_name(kobj));
+	if (!type)
+		return -EINVAL;
+
+	count = find_available_mdev_instances(idxd, type);
+
+	return sprintf(buf, "%d\n", count);
+}
+static MDEV_TYPE_ATTR_RO(available_instances);
+
+static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
+			       char *buf)
+{
+	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
+}
+static MDEV_TYPE_ATTR_RO(device_api);
+
+static struct attribute *idxd_mdev_types_attrs[] = {
+	&mdev_type_attr_name.attr,
+	&mdev_type_attr_device_api.attr,
+	&mdev_type_attr_available_instances.attr,
+	NULL,
+};
+
+static struct attribute_group idxd_mdev_type_group0 = {
+	.name = "1dwq",
+	.attrs = idxd_mdev_types_attrs,
+};
+
+static struct attribute_group *idxd_mdev_type_groups[] = {
+	&idxd_mdev_type_group0,
+	NULL,
+};
+
 static const struct mdev_parent_ops idxd_vdcm_ops = {
+	.supported_type_groups	= idxd_mdev_type_groups,
 	.create			= idxd_vdcm_create,
 	.remove			= idxd_vdcm_remove,
 	.open			= idxd_vdcm_open,


  parent reply index

Thread overview: 97+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-21 16:02 [PATCH RFC v2 00/18] Add VFIO mediated device support and DEV-MSI support for the idxd driver Dave Jiang
2020-07-21 16:02 ` [PATCH RFC v2 01/18] platform-msi: Introduce platform_msi_ops Dave Jiang
2020-07-21 16:02 ` [PATCH RFC v2 02/18] irq/dev-msi: Add support for a new DEV_MSI irq domain Dave Jiang
2020-07-21 16:13   ` Jason Gunthorpe
2020-07-22 16:50     ` Dey, Megha
2020-07-22 18:52   ` Marc Zyngier
2020-07-22 19:59     ` Jason Gunthorpe
2020-07-23  8:51       ` Marc Zyngier
2020-07-24  0:16         ` Jason Gunthorpe
2020-07-24  0:36           ` Thomas Gleixner
2020-08-05 19:18       ` Dey, Megha
2020-08-05 22:15         ` Jason Gunthorpe
2020-08-05 22:36           ` Dey, Megha
2020-08-05 22:53             ` Jason Gunthorpe
2020-08-06  0:13               ` Dey, Megha
2020-08-06  0:19                 ` Jason Gunthorpe
2020-08-06  0:32                   ` Dey, Megha
2020-08-06  0:46                     ` Jason Gunthorpe
2020-08-06 17:10                     ` Thomas Gleixner
2020-08-06 17:58                       ` Dey, Megha
2020-08-06 20:21                         ` Thomas Gleixner
2020-08-06 22:27                           ` Dey, Megha
2020-08-07  8:48                             ` Thomas Gleixner
2020-08-07 12:06                           ` Jason Gunthorpe
2020-08-07 12:38                             ` gregkh
2020-08-07 13:34                               ` Jason Gunthorpe
2020-08-07 16:47                                 ` Thomas Gleixner
2020-08-07 17:54                                   ` Dey, Megha
2020-08-07 18:39                                     ` Jason Gunthorpe
2020-08-07 20:31                                       ` Dey, Megha
2020-08-08 19:47                                     ` Thomas Gleixner
2020-08-10 21:46                                       ` Thomas Gleixner
2020-08-11  9:53                                         ` Thomas Gleixner
2020-08-11 18:46                                           ` Dey, Megha
2020-08-11 21:25                                             ` Thomas Gleixner
2020-08-11 18:39                                       ` Dey, Megha
2020-08-11 22:39                                         ` Thomas Gleixner
2020-08-07 15:22                             ` Thomas Gleixner
2020-08-05 18:55     ` Dey, Megha
2020-07-21 16:02 ` [PATCH RFC v2 03/18] irq/dev-msi: Create IR-DEV-MSI " Dave Jiang
2020-07-21 16:21   ` Jason Gunthorpe
2020-07-22 17:03     ` Dey, Megha
2020-07-22 17:33       ` Jason Gunthorpe
2020-07-22 20:44   ` Thomas Gleixner
2020-08-05 19:02     ` Dey, Megha
2020-07-21 16:02 ` [PATCH RFC v2 04/18] irq/dev-msi: Introduce APIs to allocate/free dev-msi interrupts Dave Jiang
2020-07-21 16:25   ` Jason Gunthorpe
2020-07-22 17:05     ` Dey, Megha
2020-07-22 17:35       ` Jason Gunthorpe
2020-08-05 20:19         ` Dey, Megha
2020-07-21 16:02 ` [PATCH RFC v2 05/18] dmaengine: idxd: add support for readonly config devices Dave Jiang
2020-07-21 16:02 ` [PATCH RFC v2 06/18] dmaengine: idxd: add interrupt handle request support Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 07/18] dmaengine: idxd: add DEV-MSI support in base driver Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 08/18] dmaengine: idxd: add device support functions in prep for mdev Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 09/18] dmaengine: idxd: add basic mdev registration and helper functions Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 10/18] dmaengine: idxd: add emulation rw routines Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 11/18] dmaengine: idxd: prep for virtual device commands Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 12/18] dmaengine: idxd: virtual device commands emulation Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 13/18] dmaengine: idxd: ims setup for the vdcm Dave Jiang
2020-07-21 16:03 ` [PATCH RFC v2 14/18] dmaengine: idxd: add mdev type as a new wq type Dave Jiang
2020-07-21 16:03 ` Dave Jiang [this message]
2020-07-21 16:04 ` [PATCH RFC v2 16/18] dmaengine: idxd: add new wq state for mdev Dave Jiang
2020-07-21 16:04 ` [PATCH RFC v2 17/18] dmaengine: idxd: add error notification from host driver to mediated device Dave Jiang
2020-07-21 16:04 ` [PATCH RFC v2 18/18] dmaengine: idxd: add ABI documentation for mediated device support Dave Jiang
2020-07-21 16:28 ` [PATCH RFC v2 00/18] Add VFIO mediated device support and DEV-MSI support for the idxd driver Greg KH
2020-07-21 17:17   ` Dave Jiang
2020-07-21 21:35   ` Dan Williams
2020-07-21 16:45 ` Jason Gunthorpe
2020-07-21 18:00   ` Dave Jiang
2020-07-22 17:31     ` Dey, Megha
2020-07-22 18:16       ` Jason Gunthorpe
2020-07-21 23:54   ` Tian, Kevin
2020-07-24  0:19     ` Jason Gunthorpe
2020-08-06  1:22       ` Alex Williamson
2020-08-07 12:19         ` Jason Gunthorpe
2020-08-10  7:32           ` Tian, Kevin
2020-08-11 17:00             ` Alex Williamson
2020-08-12  1:58               ` Tian, Kevin
2020-08-12  2:36                 ` Alex Williamson
2020-08-12  3:35                   ` Tian, Kevin
2020-08-12  3:28             ` Jason Wang
2020-08-12  4:05               ` Tian, Kevin
2020-08-13  4:33                 ` Jason Wang
2020-08-13  5:26                   ` Tian, Kevin
2020-08-13  6:01                     ` Jason Wang
2020-08-14 13:23                       ` Jason Gunthorpe
2020-08-17  2:24                         ` Tian, Kevin
2020-08-14 13:35             ` Jason Gunthorpe
2020-08-17  2:12               ` Tian, Kevin
2020-08-18  0:43                 ` Jason Gunthorpe
2020-08-18  1:09                   ` Tian, Kevin
2020-08-18 11:50                     ` Jason Gunthorpe
2020-08-18 16:27                       ` Paolo Bonzini
2020-08-18 16:49                         ` Jason Gunthorpe
2020-08-18 17:05                           ` Paolo Bonzini
2020-08-18 17:18                             ` Jason Gunthorpe
2020-08-19  7:29                       ` Tian, Kevin

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