diff mbox series

[v3,01/15] dmaengine: idxd: add wq driver name support for accel-config user tool

Message ID 20230428205539.113902-2-tom.zanussi@linux.intel.com (mailing list archive)
State Superseded
Delegated to: Herbert Xu
Headers show
Series crypto: Add Intel Analytics Accelerator (IAA) crypto compression driver | expand

Commit Message

Zanussi, Tom April 28, 2023, 8:55 p.m. UTC 
From: Dave Jiang <dave.jiang@intel.com>

With the possibility of multiple wq drivers that can be bound to the wq,
the user config tool accel-config needs a way to know which wq driver to
bind to the wq. Introduce per wq driver_name sysfs attribute where the user
can indicate the driver to be bound to the wq. This allows accel-config to
just bind to the driver using wq->driver_name.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
---
 .../ABI/stable/sysfs-driver-dma-idxd          |  6 ++++
 drivers/dma/idxd/cdev.c                       |  8 ++++++
 drivers/dma/idxd/dma.c                        |  6 ++++
 drivers/dma/idxd/idxd.h                       |  7 +++++
 drivers/dma/idxd/sysfs.c                      | 28 +++++++++++++++++++
 include/uapi/linux/idxd.h                     |  1 +
 6 files changed, 56 insertions(+)

Comments

Fenghua Yu April 29, 2023, 12:14 a.m. UTC | #1 
Hi, Tom,

On 4/28/23 13:55, Tom Zanussi wrote:
> From: Dave Jiang <dave.jiang@intel.com>
> 
> With the possibility of multiple wq drivers that can be bound to the wq,
> the user config tool accel-config needs a way to know which wq driver to
> bind to the wq. Introduce per wq driver_name sysfs attribute where the user
> can indicate the driver to be bound to the wq. This allows accel-config to
> just bind to the driver using wq->driver_name.
> 
> Signed-off-by: Dave Jiang <dave.jiang@intel.com>
> Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
> ---

...

> diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
> index 7ced8d283d98..505118fc19de 100644
> --- a/drivers/dma/idxd/idxd.h
> +++ b/drivers/dma/idxd/idxd.h
> @@ -214,6 +214,8 @@ struct idxd_wq {
>   	char name[WQ_NAME_SIZE + 1];
>   	u64 max_xfer_bytes;
>   	u32 max_batch_size;
> +
> +	char driver_name[WQ_NAME_SIZE + 1];

It's confused to use "WQ_NAME_SIZE" for driver name size.
Maybe it's better to have a new definition "DRIVER_NAME_SIZE"?
BTW, WQ_NAME_SIZE is 1024 which is unnecessary big for storing 
driver_name[] in the structure. It would be better to have a smaller 
size (e.g. 128) in DRIVER_NAME_SIZE.

Thanks.

-Fenghua
Zanussi, Tom May 1, 2023, 2:01 p.m. UTC | #2 
Hi Fenghua,

On Fri, 2023-04-28 at 17:14 -0700, Fenghua Yu wrote:
> Hi, Tom,
> 
> On 4/28/23 13:55, Tom Zanussi wrote:
> > From: Dave Jiang <dave.jiang@intel.com>
> > 
> > With the possibility of multiple wq drivers that can be bound to
> > the wq,
> > the user config tool accel-config needs a way to know which wq
> > driver to
> > bind to the wq. Introduce per wq driver_name sysfs attribute where
> > the user
> > can indicate the driver to be bound to the wq. This allows accel-
> > config to
> > just bind to the driver using wq->driver_name.
> > 
> > Signed-off-by: Dave Jiang <dave.jiang@intel.com>
> > Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
> > ---
> 
> ...
> 
> > diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
> > index 7ced8d283d98..505118fc19de 100644
> > --- a/drivers/dma/idxd/idxd.h
> > +++ b/drivers/dma/idxd/idxd.h
> > @@ -214,6 +214,8 @@ struct idxd_wq {
> >         char name[WQ_NAME_SIZE + 1];
> >         u64 max_xfer_bytes;
> >         u32 max_batch_size;
> > +
> > +       char driver_name[WQ_NAME_SIZE + 1];
> 
> It's confused to use "WQ_NAME_SIZE" for driver name size.
> Maybe it's better to have a new definition "DRIVER_NAME_SIZE"?
> BTW, WQ_NAME_SIZE is 1024 which is unnecessary big for storing 
> driver_name[] in the structure. It would be better to have a smaller 
> size (e.g. 128) in DRIVER_NAME_SIZE.

Yes, that makes sense - I'll add an IAA_DRIVER_NAME_SIZE of 128 and use
that instead.

Thanks,

Tom

> 
> Thanks.
> 
> -Fenghua
diff mbox series

Patch

diff --git a/Documentation/ABI/stable/sysfs-driver-dma-idxd b/Documentation/ABI/stable/sysfs-driver-dma-idxd
index 3becc9a82bdf..d5daae442fe7 100644
--- a/Documentation/ABI/stable/sysfs-driver-dma-idxd
+++ b/Documentation/ABI/stable/sysfs-driver-dma-idxd
@@ -244,6 +244,12 @@  Description:	Shows the operation capability bits displayed in bitmap format
 		correlates to the operations allowed. It's visible only
 		on platforms that support the capability.
 
+What:		/sys/bus/dsa/devices/wq<m>.<n>/driver_name
+Date:		Mar 27, 2023
+KernelVersion:	6.4.0
+Contact:	dmaengine@vger.kernel.org
+Description:	Name of driver to be bounded to the wq.
+
 What:           /sys/bus/dsa/devices/engine<m>.<n>/group_id
 Date:           Oct 25, 2019
 KernelVersion:  5.6.0
diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c
index 674bfefca088..f3d1604e753d 100644
--- a/drivers/dma/idxd/cdev.c
+++ b/drivers/dma/idxd/cdev.c
@@ -304,6 +304,7 @@  void idxd_wq_del_cdev(struct idxd_wq *wq)
 
 static int idxd_user_drv_probe(struct idxd_dev *idxd_dev)
 {
+	struct device *dev = &idxd_dev->conf_dev;
 	struct idxd_wq *wq = idxd_dev_to_wq(idxd_dev);
 	struct idxd_device *idxd = wq->idxd;
 	int rc;
@@ -330,6 +331,13 @@  static int idxd_user_drv_probe(struct idxd_dev *idxd_dev)
 	}
 
 	mutex_lock(&wq->wq_lock);
+
+	if (!idxd_wq_driver_name_match(wq, dev)) {
+		idxd->cmd_status = IDXD_SCMD_WQ_NO_DRV_NAME;
+		rc = -ENODEV;
+		goto err;
+	}
+
 	wq->type = IDXD_WQT_USER;
 	rc = drv_enable_wq(wq);
 	if (rc < 0)
diff --git a/drivers/dma/idxd/dma.c b/drivers/dma/idxd/dma.c
index eb35ca313684..8bb7e7ff8d6a 100644
--- a/drivers/dma/idxd/dma.c
+++ b/drivers/dma/idxd/dma.c
@@ -305,6 +305,12 @@  static int idxd_dmaengine_drv_probe(struct idxd_dev *idxd_dev)
 		return -ENXIO;
 
 	mutex_lock(&wq->wq_lock);
+	if (!idxd_wq_driver_name_match(wq, dev)) {
+		idxd->cmd_status = IDXD_SCMD_WQ_NO_DRV_NAME;
+		rc = -ENODEV;
+		goto err;
+	}
+
 	wq->type = IDXD_WQT_KERNEL;
 
 	rc = drv_enable_wq(wq);
diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index 7ced8d283d98..505118fc19de 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -214,6 +214,8 @@  struct idxd_wq {
 	char name[WQ_NAME_SIZE + 1];
 	u64 max_xfer_bytes;
 	u32 max_batch_size;
+
+	char driver_name[WQ_NAME_SIZE + 1];
 };
 
 struct idxd_engine {
@@ -580,6 +582,11 @@  static inline void idxd_wqcfg_set_max_batch_shift(int idxd_type, union wqcfg *wq
 		wqcfg->max_batch_shift = max_batch_shift;
 }
 
+static inline int idxd_wq_driver_name_match(struct idxd_wq *wq, struct device *dev)
+{
+	return (strncmp(wq->driver_name, dev->driver->name, strlen(dev->driver->name)) == 0);
+}
+
 int __must_check __idxd_driver_register(struct idxd_device_driver *idxd_drv,
 					struct module *module, const char *mod_name);
 #define idxd_driver_register(driver) \
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index 18cd8151dee0..cb5864c98d5a 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -1224,6 +1224,33 @@  static ssize_t wq_op_config_store(struct device *dev, struct device_attribute *a
 static struct device_attribute dev_attr_wq_op_config =
 		__ATTR(op_config, 0644, wq_op_config_show, wq_op_config_store);
 
+static ssize_t wq_driver_name_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct idxd_wq *wq = confdev_to_wq(dev);
+
+	return sysfs_emit(buf, "%s\n", wq->driver_name);
+}
+
+static ssize_t wq_driver_name_store(struct device *dev, struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	struct idxd_wq *wq = confdev_to_wq(dev);
+
+	if (wq->state != IDXD_WQ_DISABLED)
+		return -EPERM;
+
+	if (strlen(buf) > WQ_NAME_SIZE || strlen(buf) == 0)
+		return -EINVAL;
+
+	memset(wq->driver_name, 0, WQ_NAME_SIZE + 1);
+	strncpy(wq->driver_name, buf, WQ_NAME_SIZE);
+	strreplace(wq->name, '\n', '\0');
+	return count;
+}
+
+static struct device_attribute dev_attr_wq_driver_name =
+		__ATTR(driver_name, 0644, wq_driver_name_show, wq_driver_name_store);
+
 static struct attribute *idxd_wq_attributes[] = {
 	&dev_attr_wq_clients.attr,
 	&dev_attr_wq_state.attr,
@@ -1242,6 +1269,7 @@  static struct attribute *idxd_wq_attributes[] = {
 	&dev_attr_wq_occupancy.attr,
 	&dev_attr_wq_enqcmds_retries.attr,
 	&dev_attr_wq_op_config.attr,
+	&dev_attr_wq_driver_name.attr,
 	NULL,
 };
 
diff --git a/include/uapi/linux/idxd.h b/include/uapi/linux/idxd.h
index 1d553bedbdb5..2f85c8f59eb5 100644
--- a/include/uapi/linux/idxd.h
+++ b/include/uapi/linux/idxd.h
@@ -30,6 +30,7 @@  enum idxd_scmd_stat {
 	IDXD_SCMD_WQ_NO_PRIV = 0x800f0000,
 	IDXD_SCMD_WQ_IRQ_ERR = 0x80100000,
 	IDXD_SCMD_WQ_USER_NO_IOMMU = 0x80110000,
+	IDXD_SCMD_WQ_NO_DRV_NAME = 0x80200000,
 };
 
 #define IDXD_SCMD_SOFTERR_MASK	0x80000000