diff mbox series

[v8,1/3] uacce: supports device isolation feature

Message ID 20220902031304.37516-2-yekai13@huawei.com (mailing list archive)
State Changes Requested
Delegated to: Herbert Xu
Headers show
Series crypto: hisilicon - supports device isolation feature | expand

Commit Message

yekai (A) Sept. 2, 2022, 3:13 a.m. UTC 
UACCE adds the hardware error isolation API. Users can configure
the isolation frequency by this sysfs node. UACCE reports the device
isolate state to the user space. If the AER error frequency exceeds
the value of setting for a certain period of time, the device will be
isolated.

Signed-off-by: Kai Ye <yekai13@huawei.com>
---
 drivers/misc/uacce/uacce.c | 58 ++++++++++++++++++++++++++++++++++++++
 include/linux/uacce.h      | 11 ++++++++
 2 files changed, 69 insertions(+)

Comments

Greg Kroah-Hartman Sept. 9, 2022, 8:30 a.m. UTC | #1 
On Fri, Sep 02, 2022 at 03:13:02AM +0000, Kai Ye wrote:
> UACCE adds the hardware error isolation API. Users can configure
> the isolation frequency by this sysfs node. UACCE reports the device
> isolate state to the user space. If the AER error frequency exceeds
> the value of setting for a certain period of time, the device will be
> isolated.
> 
> Signed-off-by: Kai Ye <yekai13@huawei.com>
> ---
>  drivers/misc/uacce/uacce.c | 58 ++++++++++++++++++++++++++++++++++++++
>  include/linux/uacce.h      | 11 ++++++++
>  2 files changed, 69 insertions(+)
> 
> diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c
> index 281c54003edc..41f454c89cd1 100644
> --- a/drivers/misc/uacce/uacce.c
> +++ b/drivers/misc/uacce/uacce.c
> @@ -7,6 +7,8 @@
>  #include <linux/slab.h>
>  #include <linux/uacce.h>
>  
> +#define MAX_ERR_ISOLATE_COUNT		65535

What units is this in?  Shouldn't this be in a .h file somewhere as it
is a limit you impose on a driver implementing this API.

> +
>  static struct class *uacce_class;
>  static dev_t uacce_devt;
>  static DEFINE_MUTEX(uacce_mutex);
> @@ -339,12 +341,57 @@ static ssize_t region_dus_size_show(struct device *dev,
>  		       uacce->qf_pg_num[UACCE_QFRT_DUS] << PAGE_SHIFT);
>  }
>  
> +static ssize_t isolate_show(struct device *dev,
> +			    struct device_attribute *attr, char *buf)
> +{
> +	struct uacce_device *uacce = to_uacce_device(dev);
> +
> +	if (!uacce->ops->get_isolate_state)
> +		return -ENODEV;
> +
> +	return sysfs_emit(buf, "%d\n", uacce->ops->get_isolate_state(uacce));
> +}
> +
> +static ssize_t isolate_strategy_show(struct device *dev,
> +				     struct device_attribute *attr, char *buf)
> +{
> +	struct uacce_device *uacce = to_uacce_device(dev);
> +	u32 val;
> +
> +	val = uacce->ops->isolate_strategy_read(uacce);
> +	if (val > MAX_ERR_ISOLATE_COUNT)
> +		return -EINVAL;

How can a driver return a higher number here?

> +
> +	return sysfs_emit(buf, "%u\n", val);
> +}
> +
> +static ssize_t isolate_strategy_store(struct device *dev,
> +				      struct device_attribute *attr,
> +				      const char *buf, size_t count)
> +{
> +	struct uacce_device *uacce = to_uacce_device(dev);
> +	unsigned long val;
> +	int ret;
> +
> +	if (kstrtoul(buf, 0, &val) < 0)
> +		return -EINVAL;
> +
> +	if (val > MAX_ERR_ISOLATE_COUNT)
> +		return -EINVAL;
> +
> +	ret = uacce->ops->isolate_strategy_write(uacce, val);
> +
> +	return ret ? ret : count;

Please write out if statements.

> +}
> +
>  static DEVICE_ATTR_RO(api);
>  static DEVICE_ATTR_RO(flags);
>  static DEVICE_ATTR_RO(available_instances);
>  static DEVICE_ATTR_RO(algorithms);
>  static DEVICE_ATTR_RO(region_mmio_size);
>  static DEVICE_ATTR_RO(region_dus_size);
> +static DEVICE_ATTR_RO(isolate);
> +static DEVICE_ATTR_RW(isolate_strategy);
>  
>  static struct attribute *uacce_dev_attrs[] = {
>  	&dev_attr_api.attr,
> @@ -353,6 +400,8 @@ static struct attribute *uacce_dev_attrs[] = {
>  	&dev_attr_algorithms.attr,
>  	&dev_attr_region_mmio_size.attr,
>  	&dev_attr_region_dus_size.attr,
> +	&dev_attr_isolate.attr,
> +	&dev_attr_isolate_strategy.attr,
>  	NULL,
>  };
>  
> @@ -368,6 +417,15 @@ static umode_t uacce_dev_is_visible(struct kobject *kobj,
>  	    (!uacce->qf_pg_num[UACCE_QFRT_DUS])))
>  		return 0;
>  
> +	if (attr == &dev_attr_isolate_strategy.attr &&
> +	    (!uacce->ops->isolate_strategy_read ||
> +	     !uacce->ops->isolate_strategy_write))

So you need either a read or write?  Why not both?

thanks,

greg k-h
diff mbox series

Patch

diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c
index 281c54003edc..41f454c89cd1 100644
--- a/drivers/misc/uacce/uacce.c
+++ b/drivers/misc/uacce/uacce.c
@@ -7,6 +7,8 @@ 
 #include <linux/slab.h>
 #include <linux/uacce.h>
 
+#define MAX_ERR_ISOLATE_COUNT		65535
+
 static struct class *uacce_class;
 static dev_t uacce_devt;
 static DEFINE_MUTEX(uacce_mutex);
@@ -339,12 +341,57 @@  static ssize_t region_dus_size_show(struct device *dev,
 		       uacce->qf_pg_num[UACCE_QFRT_DUS] << PAGE_SHIFT);
 }
 
+static ssize_t isolate_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	struct uacce_device *uacce = to_uacce_device(dev);
+
+	if (!uacce->ops->get_isolate_state)
+		return -ENODEV;
+
+	return sysfs_emit(buf, "%d\n", uacce->ops->get_isolate_state(uacce));
+}
+
+static ssize_t isolate_strategy_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct uacce_device *uacce = to_uacce_device(dev);
+	u32 val;
+
+	val = uacce->ops->isolate_strategy_read(uacce);
+	if (val > MAX_ERR_ISOLATE_COUNT)
+		return -EINVAL;
+
+	return sysfs_emit(buf, "%u\n", val);
+}
+
+static ssize_t isolate_strategy_store(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf, size_t count)
+{
+	struct uacce_device *uacce = to_uacce_device(dev);
+	unsigned long val;
+	int ret;
+
+	if (kstrtoul(buf, 0, &val) < 0)
+		return -EINVAL;
+
+	if (val > MAX_ERR_ISOLATE_COUNT)
+		return -EINVAL;
+
+	ret = uacce->ops->isolate_strategy_write(uacce, val);
+
+	return ret ? ret : count;
+}
+
 static DEVICE_ATTR_RO(api);
 static DEVICE_ATTR_RO(flags);
 static DEVICE_ATTR_RO(available_instances);
 static DEVICE_ATTR_RO(algorithms);
 static DEVICE_ATTR_RO(region_mmio_size);
 static DEVICE_ATTR_RO(region_dus_size);
+static DEVICE_ATTR_RO(isolate);
+static DEVICE_ATTR_RW(isolate_strategy);
 
 static struct attribute *uacce_dev_attrs[] = {
 	&dev_attr_api.attr,
@@ -353,6 +400,8 @@  static struct attribute *uacce_dev_attrs[] = {
 	&dev_attr_algorithms.attr,
 	&dev_attr_region_mmio_size.attr,
 	&dev_attr_region_dus_size.attr,
+	&dev_attr_isolate.attr,
+	&dev_attr_isolate_strategy.attr,
 	NULL,
 };
 
@@ -368,6 +417,15 @@  static umode_t uacce_dev_is_visible(struct kobject *kobj,
 	    (!uacce->qf_pg_num[UACCE_QFRT_DUS])))
 		return 0;
 
+	if (attr == &dev_attr_isolate_strategy.attr &&
+	    (!uacce->ops->isolate_strategy_read ||
+	     !uacce->ops->isolate_strategy_write))
+		return 0;
+
+	if (attr == &dev_attr_isolate.attr &&
+	    !uacce->ops->get_isolate_state)
+		return 0;
+
 	return attr->mode;
 }
 
diff --git a/include/linux/uacce.h b/include/linux/uacce.h
index 48e319f40275..69e8f238d80c 100644
--- a/include/linux/uacce.h
+++ b/include/linux/uacce.h
@@ -30,6 +30,9 @@  struct uacce_qfile_region {
  * @is_q_updated: check whether the task is finished
  * @mmap: mmap addresses of queue to user space
  * @ioctl: ioctl for user space users of the queue
+ * @get_isolate_state: get the device state after set the isolate strategy
+ * @isolate_strategy_write: stored the isolate strategy to the device
+ * @isolate_strategy_read: read the isolate strategy value from the device
  */
 struct uacce_ops {
 	int (*get_available_instances)(struct uacce_device *uacce);
@@ -43,6 +46,9 @@  struct uacce_ops {
 		    struct uacce_qfile_region *qfr);
 	long (*ioctl)(struct uacce_queue *q, unsigned int cmd,
 		      unsigned long arg);
+	enum uacce_dev_state (*get_isolate_state)(struct uacce_device *uacce);
+	int (*isolate_strategy_write)(struct uacce_device *uacce, u32 freq);
+	u32 (*isolate_strategy_read)(struct uacce_device *uacce);
 };
 
 /**
@@ -57,6 +63,11 @@  struct uacce_interface {
 	const struct uacce_ops *ops;
 };
 
+enum uacce_dev_state {
+	UACCE_DEV_NORMAL,
+	UACCE_DEV_ISOLATE,
+};
+
 enum uacce_q_state {
 	UACCE_Q_ZOMBIE = 0,
 	UACCE_Q_INIT,