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libap: add routines to generate masks for vfio_ap_device

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Add routines to generate mask values for the adapters, domains and
control domains for a specified vfio_ap_device struct.

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 12:28:54 -04:00
committed by Jan Höppner
parent 46dadc8cc4
commit 962af1a90e
2 changed files with 90 additions and 0 deletions
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3
include/lib/ap.h
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@@ -88,6 +88,9 @@ bool ap_read_udev_masks(char *path, char *ap, char *aq, bool *read_ap,
bool *read_aq);
void ap_mask_to_list(char *mask, struct util_list *list);
void ap_list_remove_all(struct util_list *list);
char *vfio_ap_device_get_adapter_mask(struct vfio_ap_device *dev, int *size);
char *vfio_ap_device_get_domain_mask(struct vfio_ap_device *dev, int *size);
char *vfio_ap_device_get_control_mask(struct vfio_ap_device *dev, int *size);
/* Lock Functions */
int ap_get_lock(void);

87
libap/ap.c
View File

@@ -33,6 +33,9 @@
#include "lib/util_path.h"
#include "lib/util_udev.h"
static const char default_mask[AP_MASK_SIZE] =
"0x0000000000000000000000000000000000000000000000000000000000000000";
/*
* Return sysfs path to a bus attribute
* Note: caller is responsible for freeing the returned string
@@ -737,6 +740,90 @@ static unsigned int random_delay(void)
return AP_LOCK_DELAY_US + (rand() % AP_LOCK_VARIANCE_US);
}
/**
* Return a mask of assigned adapters for the specified vfio_ap device.
* Note: caller is responsible for freeing the returned string
*
* @param[in] dev Vfio-ap struct to get adapter mask from
* @param[in, out] size Size of mask buffer returned
*
* @retval != 0 Adapter mask (hex string)
* @retval 0 Failed to generate a mask
*/
char *vfio_ap_device_get_adapter_mask(struct vfio_ap_device *dev, int *size)
{
struct vfio_ap_node *node;
char *mask;
if (!dev || !size)
return NULL;
mask = util_strdup(default_mask);
*size = AP_MASK_SIZE;
util_list_iterate(dev->adapters, node) {
ap_set_bit(node->id, mask, true);
}
return mask;
}
/**
* Return a mask of assigned domains for the specified vfio_ap device.
* Note: caller is responsible for freeing the returned string
*
* @param[in] dev Vfio-ap struct to get domain mask from
* @param[in, out] size Size of mask buffer returned
*
* @retval != 0 Domain mask (hex string)
* @retval 0 Failed to generate a mask
*/
char *vfio_ap_device_get_domain_mask(struct vfio_ap_device *dev, int *size)
{
struct vfio_ap_node *node;
char *mask;
if (!dev || !size)
return NULL;
mask = util_strdup(default_mask);
*size = AP_MASK_SIZE;
util_list_iterate(dev->domains, node) {
ap_set_bit(node->id, mask, true);
}
return mask;
}
/**
* Return a mask of assigned control domains for the specified vfio_ap device.
* Note: caller is responsible for freeing the returned string
*
* @param[in] dev Vfio-ap struct to get control domain mask from
* @param[in, out] size Size of mask buffer returned
*
* @retval != 0 Control domain mask (hex string)
* @retval 0 Failed to generate a mask
*/
char *vfio_ap_device_get_control_mask(struct vfio_ap_device *dev, int *size)
{
struct vfio_ap_node *node;
char *mask;
if (!dev || !size)
return NULL;
mask = util_strdup(default_mask);
*size = AP_MASK_SIZE;
util_list_iterate(dev->controls, node) {
ap_set_bit(node->id, mask, true);
}
return mask;
}
/**
* Acquire the ap config lock using this Process ID
*