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libap: add routine to check for dynamic config support

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For a given vfio-ap mdev, determine whether or not the device will
need dynamic config operations.  This boils down to whether or not
the device is currently active + whether or not the kernel is
detected to support dynamic config operations (via the
'ap_config' sysfs attribute).

Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: Anthony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Matthew Rosato
2024-05-29 12:28:50 -04:00
committed by Jan Höppner
parent 9c8d117cc2
commit 46dadc8cc4
2 changed files with 23 additions and 0 deletions
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1
include/lib/ap.h
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@@ -72,6 +72,7 @@ char *path_get_ap_udev(void);
void vfio_ap_parse_matrix(struct vfio_ap_device *dev, char *matrix);
void vfio_ap_sort_matrix_results(struct vfio_ap_device *dev);
void vfio_ap_parse_control(struct vfio_ap_device *dev, char *control);
bool vfio_ap_need_dynamic_config(struct vfio_ap_device *dev);
/* Functions for reading JSON device config */
int vfio_ap_read_device_config(const char *path, struct vfio_ap_device *dev);

22
libap/ap.c
View File

@@ -416,6 +416,28 @@ void vfio_ap_parse_control(struct vfio_ap_device *dev, char *control)
}
}
/**
* Determine if the specified device is currently active. If so, see if
* it is enabled for dynamic configuration support.
*
* @param[in] dev Vfio-ap struct
*
* @retval True Device is active and enabled for dynamic config
* @retval False Device is not active OR no dynamic config support
*/
bool vfio_ap_need_dynamic_config(struct vfio_ap_device *dev)
{
char *attr = path_get_vfio_ap_attr(dev->uuid, "ap_config");
if (!attr)
return false;
if (!util_path_is_readable(attr))
return false;
return true;
}
#ifdef HAVE_JSONC
/**