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Linux headers: update

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Update against Linux 5.8-rc1.

Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Cornelia Huck 2020-06-09 16:26:53 +02:00
parent 26bf4a2921
commit f76b348ec7
25 changed files with 818 additions and 33 deletions
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48
include/standard-headers/linux/virtio_ring.h
View file

@ -84,6 +84,13 @@
* at the end of the used ring. Guest should ignore the used->flags field. */
#define VIRTIO_RING_F_EVENT_IDX 29
/* Alignment requirements for vring elements.
* When using pre-virtio 1.0 layout, these fall out naturally.
*/
#define VRING_AVAIL_ALIGN_SIZE 2
#define VRING_USED_ALIGN_SIZE 4
#define VRING_DESC_ALIGN_SIZE 16
/* Virtio ring descriptors: 16 bytes. These can chain together via "next". */
struct vring_desc {
/* Address (guest-physical). */
@ -110,28 +117,47 @@ struct vring_used_elem {
__virtio32 len;
};
typedef struct vring_used_elem __attribute__((aligned(VRING_USED_ALIGN_SIZE)))
vring_used_elem_t;
struct vring_used {
__virtio16 flags;
__virtio16 idx;
struct vring_used_elem ring[];
vring_used_elem_t ring[];
};
/*
* The ring element addresses are passed between components with different
* alignments assumptions. Thus, we might need to decrease the compiler-selected
* alignment, and so must use a typedef to make sure the aligned attribute
* actually takes hold:
*
* https://gcc.gnu.org/onlinedocs//gcc/Common-Type-Attributes.html#Common-Type-Attributes
*
* When used on a struct, or struct member, the aligned attribute can only
* increase the alignment; in order to decrease it, the packed attribute must
* be specified as well. When used as part of a typedef, the aligned attribute
* can both increase and decrease alignment, and specifying the packed
* attribute generates a warning.
*/
typedef struct vring_desc __attribute__((aligned(VRING_DESC_ALIGN_SIZE)))
vring_desc_t;
typedef struct vring_avail __attribute__((aligned(VRING_AVAIL_ALIGN_SIZE)))
vring_avail_t;
typedef struct vring_used __attribute__((aligned(VRING_USED_ALIGN_SIZE)))
vring_used_t;
struct vring {
unsigned int num;
struct vring_desc *desc;
vring_desc_t *desc;
struct vring_avail *avail;
vring_avail_t *avail;
struct vring_used *used;
vring_used_t *used;
};
/* Alignment requirements for vring elements.
* When using pre-virtio 1.0 layout, these fall out naturally.
*/
#define VRING_AVAIL_ALIGN_SIZE 2
#define VRING_USED_ALIGN_SIZE 4
#define VRING_DESC_ALIGN_SIZE 16
#ifndef VIRTIO_RING_NO_LEGACY
/* The standard layout for the ring is a continuous chunk of memory which looks
* like this. We assume num is a power of 2.
@ -179,6 +205,8 @@ static inline unsigned vring_size(unsigned int num, unsigned long align)
+ sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num;
}
#endif /* VIRTIO_RING_NO_LEGACY */
/* The following is used with USED_EVENT_IDX and AVAIL_EVENT_IDX */
/* Assuming a given event_idx value from the other side, if
* we have just incremented index from old to new_idx,