From: Dave Jiang <dave.jiang@intel.com>
To: vkoul@kernel.org, megha.dey@intel.com, maz@kernel.org,
bhelgaas@google.com, tglx@linutronix.de,
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, 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,
linux-pci@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH v4 15/17] dmaengine: idxd: add dedicated wq mdev type
Date: Fri, 30 Oct 2020 11:52:32 -0700 [thread overview]
Message-ID: <160408395282.912050.4836928882705571237.stgit@djiang5-desk3.ch.intel.com> (raw)
In-Reply-To: <160408357912.912050.17005584526266191420.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>
---
drivers/dma/idxd/mdev.c | 141 ++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 133 insertions(+), 8 deletions(-)
diff --git a/drivers/dma/idxd/mdev.c b/drivers/dma/idxd/mdev.c
index ed79c85e692e..16b56f8f7fc1 100644
--- a/drivers/dma/idxd/mdev.c
+++ b/drivers/dma/idxd/mdev.c
@@ -111,20 +111,58 @@ static void idxd_vdcm_release(struct mdev_device *mdev)
mutex_unlock(&vidxd->dev_lock);
}
+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 rc;
- /* PLACEHOLDER, wq matching comes later */
-
+ 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;
@@ -135,14 +173,23 @@ static struct vdcm_idxd *vdcm_vidxd_create(struct idxd_device *idxd, struct mdev
vidxd->num_wqs = VIDXD_MAX_WQS;
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-v1",
+ .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)
@@ -934,7 +981,85 @@ 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-v1",
+ .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,
next prev parent reply other threads:[~2020-10-30 18:54 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-30 18:50 [PATCH v4 00/17] Add VFIO mediated device support and DEV-MSI support for the idxd driver Dave Jiang
2020-10-30 18:50 ` [PATCH v4 01/17] irqchip: Add IMS (Interrupt Message Store) driver Dave Jiang
2020-10-30 22:01 ` Thomas Gleixner
2020-10-30 18:51 ` [PATCH v4 02/17] iommu/vt-d: Add DEV-MSI support Dave Jiang
2020-10-30 20:31 ` Thomas Gleixner
2020-10-30 20:52 ` Dave Jiang
2020-10-30 18:51 ` [PATCH v4 03/17] dmaengine: idxd: add theory of operation documentation for idxd mdev Dave Jiang
2020-10-30 18:51 ` [PATCH v4 04/17] dmaengine: idxd: add support for readonly config devices Dave Jiang
2020-10-30 18:51 ` [PATCH v4 05/17] dmaengine: idxd: add interrupt handle request support Dave Jiang
2020-10-30 18:51 ` [PATCH v4 06/17] PCI: add SIOV and IMS capability detection Dave Jiang
2020-10-30 19:51 ` Bjorn Helgaas
2020-10-30 21:20 ` Dave Jiang
2020-10-30 21:50 ` Bjorn Helgaas
2020-10-30 22:45 ` Jason Gunthorpe
2020-10-30 22:49 ` Dave Jiang
2020-11-02 13:21 ` Jason Gunthorpe
2020-11-03 2:49 ` Tian, Kevin
2020-11-03 12:43 ` Jason Gunthorpe
2020-11-04 3:41 ` Tian, Kevin
2020-11-04 12:40 ` Jason Gunthorpe
2020-11-04 13:34 ` Tian, Kevin
2020-11-04 13:54 ` Jason Gunthorpe
2020-11-06 9:48 ` Tian, Kevin
2020-11-06 13:14 ` Jason Gunthorpe
2020-11-06 16:48 ` Raj, Ashok
2020-11-06 17:51 ` Jason Gunthorpe
2020-11-06 23:47 ` Dan Williams
2020-11-07 0:12 ` Jason Gunthorpe
2020-11-07 1:42 ` Dan Williams
2020-11-08 18:11 ` Raj, Ashok
2020-11-08 18:34 ` David Woodhouse
2020-11-08 23:25 ` Raj, Ashok
2020-11-10 14:19 ` Raj, Ashok
2020-11-10 14:41 ` David Woodhouse
2020-11-08 23:41 ` Jason Gunthorpe
2020-11-09 0:05 ` Raj, Ashok
2020-11-08 18:47 ` Thomas Gleixner
2020-11-08 19:36 ` David Woodhouse
2020-11-08 22:47 ` Thomas Gleixner
2020-11-08 23:29 ` Jason Gunthorpe
2020-11-11 15:41 ` Christoph Hellwig
2020-11-11 16:09 ` Raj, Ashok
2020-11-11 22:27 ` Thomas Gleixner
2020-11-11 23:03 ` Raj, Ashok
2020-11-12 1:13 ` Thomas Gleixner
2020-11-12 13:10 ` Jason Gunthorpe
2020-11-08 23:23 ` Jason Gunthorpe
2020-11-08 23:36 ` Raj, Ashok
2020-11-09 7:37 ` Tian, Kevin
2020-11-09 16:46 ` Jason Gunthorpe
2020-11-08 23:58 ` Raj, Ashok
2020-11-09 7:59 ` Tian, Kevin
2020-11-09 11:21 ` Thomas Gleixner
2020-11-09 17:30 ` Jason Gunthorpe
2020-11-09 22:40 ` Raj, Ashok
2020-11-09 22:42 ` Thomas Gleixner
2020-11-10 5:14 ` Raj, Ashok
2020-11-10 10:27 ` Thomas Gleixner
2020-11-10 14:13 ` Raj, Ashok
2020-11-10 14:23 ` Jason Gunthorpe
2020-11-11 2:17 ` Tian, Kevin
2020-11-12 13:46 ` Jason Gunthorpe
2020-11-11 7:14 ` Tian, Kevin
2020-11-12 19:32 ` Konrad Rzeszutek Wilk
2020-11-12 22:42 ` Thomas Gleixner
2020-11-13 2:42 ` Tian, Kevin
2020-11-13 12:57 ` Jason Gunthorpe
2020-11-13 13:32 ` Thomas Gleixner
2020-11-13 16:12 ` Luck, Tony
2020-11-13 17:38 ` Raj, Ashok
2020-11-14 10:34 ` Christoph Hellwig
2020-11-14 21:18 ` Raj, Ashok
2020-11-15 11:26 ` Thomas Gleixner
2020-11-15 19:31 ` Raj, Ashok
2020-11-15 22:11 ` Thomas Gleixner
2020-11-16 0:22 ` Raj, Ashok
2020-11-16 7:31 ` Tian, Kevin
2020-11-16 15:46 ` Jason Gunthorpe
2020-11-16 17:56 ` Thomas Gleixner
2020-11-16 18:02 ` Jason Gunthorpe
2020-11-16 20:37 ` Thomas Gleixner
2020-11-16 23:51 ` Tian, Kevin
2020-11-17 9:21 ` Thomas Gleixner
2020-11-16 8:25 ` Christoph Hellwig
2020-11-10 14:19 ` Jason Gunthorpe
2020-11-11 2:35 ` Tian, Kevin
2020-11-08 21:18 ` Thomas Gleixner
2020-11-08 22:09 ` David Woodhouse
2020-11-08 22:52 ` Thomas Gleixner
2020-11-07 0:32 ` Thomas Gleixner
2020-11-09 5:25 ` Tian, Kevin
2020-10-30 18:51 ` [PATCH v4 07/17] dmaengine: idxd: add IMS support in base driver Dave Jiang
2020-10-30 18:51 ` [PATCH v4 08/17] dmaengine: idxd: add device support functions in prep for mdev Dave Jiang
2020-10-30 18:51 ` [PATCH v4 09/17] dmaengine: idxd: add basic mdev registration and helper functions Dave Jiang
2020-10-30 18:51 ` [PATCH v4 10/17] dmaengine: idxd: add emulation rw routines Dave Jiang
2020-10-30 18:52 ` [PATCH v4 11/17] dmaengine: idxd: prep for virtual device commands Dave Jiang
2020-10-30 18:52 ` [PATCH v4 12/17] dmaengine: idxd: virtual device commands emulation Dave Jiang
2020-10-30 18:52 ` [PATCH v4 13/17] dmaengine: idxd: ims setup for the vdcm Dave Jiang
2020-10-30 21:26 ` Thomas Gleixner
2020-10-30 18:52 ` [PATCH v4 14/17] dmaengine: idxd: add mdev type as a new wq type Dave Jiang
2020-10-30 18:52 ` Dave Jiang [this message]
2020-10-30 18:52 ` [PATCH v4 16/17] dmaengine: idxd: add new wq state for mdev Dave Jiang
2020-10-30 18:52 ` [PATCH v4 17/17] dmaengine: idxd: add error notification from host driver to mediated device Dave Jiang
2020-10-30 18:58 ` [PATCH v4 00/17] Add VFIO mediated device support and DEV-MSI support for the idxd driver Jason Gunthorpe
2020-10-30 19:13 ` Dave Jiang
2020-10-30 19:17 ` Jason Gunthorpe
2020-10-30 19:23 ` Raj, Ashok
2020-10-30 19:30 ` Jason Gunthorpe
2020-10-30 20:43 ` Raj, Ashok
2020-10-30 22:54 ` Jason Gunthorpe
2020-10-31 2:50 ` Thomas Gleixner
2020-10-31 23:53 ` Raj, Ashok
2020-11-02 13:20 ` Jason Gunthorpe
2020-11-02 16:20 ` Raj, Ashok
2020-11-02 17:19 ` Jason Gunthorpe
2020-11-02 18:18 ` Dave Jiang
2020-11-02 18:26 ` Jason Gunthorpe
2020-11-02 18:38 ` Dan Williams
2020-11-02 18:51 ` Jason Gunthorpe
2020-11-02 19:26 ` Dan Williams
2020-10-30 20:48 ` Thomas Gleixner
2020-10-30 20:59 ` Dave Jiang
2020-10-30 22:10 ` Thomas Gleixner
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