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,
x86@kernel.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH v3 13/18] dmaengine: idxd: add dedicated wq mdev type
Date: Tue, 15 Sep 2020 16:29:04 -0700 [thread overview]
Message-ID: <160021254470.67751.9829487993127571356.stgit@djiang5-desk3.ch.intel.com> (raw)
In-Reply-To: <160021207013.67751.8220471499908137671.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 | 142 ++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 133 insertions(+), 9 deletions(-)
diff --git a/drivers/dma/idxd/mdev.c b/drivers/dma/idxd/mdev.c
index 6b91abd4d8d9..2d3ff1a50d39 100644
--- a/drivers/dma/idxd/mdev.c
+++ b/drivers/dma/idxd/mdev.c
@@ -99,21 +99,58 @@ 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 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;
@@ -127,14 +164,23 @@ static struct vdcm_idxd *vdcm_vidxd_create(struct idxd_device *idxd, struct mdev
vidxd->ims_index[i] = -1;
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)
@@ -910,7 +956,85 @@ 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:[~2020-09-15 23:34 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <160021207013.67751.8220471499908137671.stgit@djiang5-desk3.ch.intel.com>
2020-09-15 23:27 ` [PATCH v3 01/18] irqchip: Add IMS (Interrupt Message Storage) driver Dave Jiang
2020-09-30 18:23 ` Thomas Gleixner
2020-10-01 22:59 ` Dey, Megha
2020-09-15 23:27 ` [PATCH v3 02/18] iommu/vt-d: Add DEV-MSI support Dave Jiang
2020-09-30 18:32 ` Thomas Gleixner
2020-10-01 23:26 ` Dey, Megha
2020-10-02 11:13 ` Thomas Gleixner
2020-10-08 7:54 ` David Woodhouse
2020-10-20 21:42 ` Dey, Megha
2020-09-15 23:28 ` [PATCH v3 05/18] dmaengine: idxd: add IMS support in base driver Dave Jiang
2020-09-30 18:47 ` Thomas Gleixner
2020-09-30 18:51 ` Jason Gunthorpe
2020-09-30 21:48 ` Thomas Gleixner
2020-09-30 21:49 ` Raj, Ashok
2020-09-30 21:57 ` Thomas Gleixner
2020-10-01 1:07 ` Raj, Ashok
2020-10-01 8:44 ` Thomas Gleixner
2020-09-30 22:38 ` Jason Gunthorpe
2020-10-01 20:48 ` Dave Jiang
2020-09-15 23:28 ` [PATCH v3 07/18] dmaengine: idxd: add basic mdev registration and helper functions Dave Jiang
2020-09-15 23:28 ` [PATCH v3 10/18] dmaengine: idxd: virtual device commands emulation Dave Jiang
2020-09-15 23:28 ` [PATCH v3 12/18] dmaengine: idxd: add mdev type as a new wq type Dave Jiang
2020-09-15 23:29 ` Dave Jiang [this message]
2020-09-15 23:29 ` [PATCH v3 14/18] dmaengine: idxd: add new wq state for mdev Dave Jiang
2020-09-15 23:29 ` [PATCH v3 15/18] dmaengine: idxd: add error notification from host driver to mediated device Dave Jiang
2020-09-15 23:29 ` [PATCH v3 16/18] dmaengine: idxd: add ABI documentation for mediated device support Dave Jiang
2020-09-17 15:06 ` [PATCH v3 00/18] Add VFIO mediated device support and DEV-MSI support for the idxd driver Jason Gunthorpe
2020-09-17 17:15 ` Dave Jiang
2020-09-17 17:27 ` Jason Gunthorpe
2020-09-17 17:30 ` Alex Williamson
2020-09-17 17:37 ` Jason Gunthorpe
[not found] ` <160021248280.67751.12525558281536923518.stgit@djiang5-desk3.ch.intel.com>
2020-09-30 18:36 ` [PATCH v3 04/18] dmaengine: idxd: add interrupt handle request support Thomas Gleixner
2020-10-01 20:16 ` Dave Jiang
[not found] ` <160021253189.67751.12686144284999931703.stgit@djiang5-desk3.ch.intel.com>
2020-09-30 19:57 ` [PATCH v3 11/18] dmaengine: idxd: ims setup for the vdcm Thomas Gleixner
2020-10-07 21:54 ` Dave Jiang
2020-10-08 7:39 ` Thomas Gleixner
2020-10-08 16:51 ` Dave Jiang
2020-10-08 23:17 ` Thomas Gleixner
2020-10-08 23:32 ` Jason Gunthorpe
2020-10-09 0:27 ` Dave Jiang
2020-10-09 1:22 ` Raj, Ashok
2020-10-09 11:57 ` Jason Gunthorpe
2020-10-09 12:43 ` Raj, Ashok
2020-10-09 12:49 ` Jason Gunthorpe
2020-10-09 13:02 ` Raj, Ashok
2020-10-09 13:12 ` Jason Gunthorpe
2020-10-09 13:40 ` Raj, Ashok
2020-10-09 14:44 ` Thomas Gleixner
2020-10-09 14:52 ` Jason Gunthorpe
2020-10-09 16:02 ` Thomas Gleixner
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