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xen/xenbus: eliminate xenbus_grant_ring()

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There is no external user of xenbus_grant_ring() left, so merge it into
the only caller xenbus_setup_ring().

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2022-04-28 09:01:05 +02:00
parent 360dc89d12
commit 4573240f07
2 changed files with 19 additions and 48 deletions
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65
drivers/xen/xenbus/xenbus_client.c
View file

@ -363,50 +363,6 @@ static void xenbus_switch_fatal(struct xenbus_device *dev, int depth, int err,
__xenbus_switch_state(dev, XenbusStateClosing, 1);
}
/**
* xenbus_grant_ring
* @dev: xenbus device
* @vaddr: starting virtual address of the ring
* @nr_pages: number of pages to be granted
* @grefs: grant reference array to be filled in
*
* Grant access to the given @vaddr to the peer of the given device.
* Then fill in @grefs with grant references. Return 0 on success, or
* -errno on error. On error, the device will switch to
* XenbusStateClosing, and the error will be saved in the store.
*/
int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr,
unsigned int nr_pages, grant_ref_t *grefs)
{
int err;
unsigned int i;
grant_ref_t gref_head;
err = gnttab_alloc_grant_references(nr_pages, &gref_head);
if (err) {
xenbus_dev_fatal(dev, err, "granting access to ring page");
return err;
}
for (i = 0; i < nr_pages; i++) {
unsigned long gfn;
if (is_vmalloc_addr(vaddr))
gfn = pfn_to_gfn(vmalloc_to_pfn(vaddr));
else
gfn = virt_to_gfn(vaddr);
grefs[i] = gnttab_claim_grant_reference(&gref_head);
gnttab_grant_foreign_access_ref(grefs[i], dev->otherend_id,
gfn, 0);
vaddr = vaddr + XEN_PAGE_SIZE;
}
return 0;
}
EXPORT_SYMBOL_GPL(xenbus_grant_ring);
/*
* xenbus_setup_ring
* @dev: xenbus device
@ -424,6 +380,7 @@ int xenbus_setup_ring(struct xenbus_device *dev, gfp_t gfp, void **vaddr,
unsigned int nr_pages, grant_ref_t *grefs)
{
unsigned long ring_size = nr_pages * XEN_PAGE_SIZE;
grant_ref_t gref_head;
unsigned int i;
int ret;
@ -433,9 +390,25 @@ int xenbus_setup_ring(struct xenbus_device *dev, gfp_t gfp, void **vaddr,
goto err;
}
ret = xenbus_grant_ring(dev, *vaddr, nr_pages, grefs);
if (ret)
ret = gnttab_alloc_grant_references(nr_pages, &gref_head);
if (ret) {
xenbus_dev_fatal(dev, ret, "granting access to %u ring pages",
nr_pages);
goto err;
}
for (i = 0; i < nr_pages; i++) {
unsigned long gfn;
if (is_vmalloc_addr(*vaddr))
gfn = pfn_to_gfn(vmalloc_to_pfn(vaddr[i]));
else
gfn = virt_to_gfn(vaddr[i]);
grefs[i] = gnttab_claim_grant_reference(&gref_head);
gnttab_grant_foreign_access_ref(grefs[i], dev->otherend_id,
gfn, 0);
}
return 0;

2
include/xen/xenbus.h
View file

@ -224,8 +224,6 @@ int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch,
const char *pathfmt, ...);
int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state new_state);
int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr,
unsigned int nr_pages, grant_ref_t *grefs);
int xenbus_setup_ring(struct xenbus_device *dev, gfp_t gfp, void **vaddr,
unsigned int nr_pages, grant_ref_t *grefs);
void xenbus_teardown_ring(void **vaddr, unsigned int nr_pages,