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path: root/drivers/xen/xenbus/xenbus_client.c
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Diffstat (limited to 'drivers/xen/xenbus/xenbus_client.c')
-rw-r--r--drivers/xen/xenbus/xenbus_client.c128
1 files changed, 87 insertions, 41 deletions
diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index 2ba09c1195c8..056da6ee1a35 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -49,6 +49,10 @@
#include "xenbus_probe.h"
+#define XENBUS_PAGES(_grants) (DIV_ROUND_UP(_grants, XEN_PFN_PER_PAGE))
+
+#define XENBUS_MAX_RING_PAGES (XENBUS_PAGES(XENBUS_MAX_RING_GRANTS))
+
struct xenbus_map_node {
struct list_head next;
union {
@@ -57,10 +61,11 @@ struct xenbus_map_node {
} pv;
struct {
struct page *pages[XENBUS_MAX_RING_PAGES];
+ unsigned long addrs[XENBUS_MAX_RING_GRANTS];
void *addr;
} hvm;
};
- grant_handle_t handles[XENBUS_MAX_RING_PAGES];
+ grant_handle_t handles[XENBUS_MAX_RING_GRANTS];
unsigned int nr_handles;
};
@@ -388,7 +393,7 @@ int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr,
}
grefs[i] = err;
- vaddr = vaddr + PAGE_SIZE;
+ vaddr = vaddr + XEN_PAGE_SIZE;
}
return 0;
@@ -479,12 +484,12 @@ static int __xenbus_map_ring(struct xenbus_device *dev,
unsigned int flags,
bool *leaked)
{
- struct gnttab_map_grant_ref map[XENBUS_MAX_RING_PAGES];
- struct gnttab_unmap_grant_ref unmap[XENBUS_MAX_RING_PAGES];
+ struct gnttab_map_grant_ref map[XENBUS_MAX_RING_GRANTS];
+ struct gnttab_unmap_grant_ref unmap[XENBUS_MAX_RING_GRANTS];
int i, j;
int err = GNTST_okay;
- if (nr_grefs > XENBUS_MAX_RING_PAGES)
+ if (nr_grefs > XENBUS_MAX_RING_GRANTS)
return -EINVAL;
for (i = 0; i < nr_grefs; i++) {
@@ -540,22 +545,22 @@ static int xenbus_map_ring_valloc_pv(struct xenbus_device *dev,
{
struct xenbus_map_node *node;
struct vm_struct *area;
- pte_t *ptes[XENBUS_MAX_RING_PAGES];
- phys_addr_t phys_addrs[XENBUS_MAX_RING_PAGES];
+ pte_t *ptes[XENBUS_MAX_RING_GRANTS];
+ phys_addr_t phys_addrs[XENBUS_MAX_RING_GRANTS];
int err = GNTST_okay;
int i;
bool leaked;
*vaddr = NULL;
- if (nr_grefs > XENBUS_MAX_RING_PAGES)
+ if (nr_grefs > XENBUS_MAX_RING_GRANTS)
return -EINVAL;
node = kzalloc(sizeof(*node), GFP_KERNEL);
if (!node)
return -ENOMEM;
- area = alloc_vm_area(PAGE_SIZE * nr_grefs, ptes);
+ area = alloc_vm_area(XEN_PAGE_SIZE * nr_grefs, ptes);
if (!area) {
kfree(node);
return -ENOMEM;
@@ -591,21 +596,44 @@ failed:
return err;
}
+struct map_ring_valloc_hvm
+{
+ unsigned int idx;
+
+ /* Why do we need two arrays? See comment of __xenbus_map_ring */
+ phys_addr_t phys_addrs[XENBUS_MAX_RING_GRANTS];
+ unsigned long addrs[XENBUS_MAX_RING_GRANTS];
+};
+
+static void xenbus_map_ring_setup_grant_hvm(unsigned long gfn,
+ unsigned int goffset,
+ unsigned int len,
+ void *data)
+{
+ struct map_ring_valloc_hvm *info = data;
+ unsigned long vaddr = (unsigned long)gfn_to_virt(gfn);
+
+ info->phys_addrs[info->idx] = vaddr;
+ info->addrs[info->idx] = vaddr;
+
+ info->idx++;
+}
+
static int xenbus_map_ring_valloc_hvm(struct xenbus_device *dev,
grant_ref_t *gnt_ref,
unsigned int nr_grefs,
void **vaddr)
{
struct xenbus_map_node *node;
- int i;
int err;
void *addr;
bool leaked = false;
- /* Why do we need two arrays? See comment of __xenbus_map_ring */
- phys_addr_t phys_addrs[XENBUS_MAX_RING_PAGES];
- unsigned long addrs[XENBUS_MAX_RING_PAGES];
+ struct map_ring_valloc_hvm info = {
+ .idx = 0,
+ };
+ unsigned int nr_pages = XENBUS_PAGES(nr_grefs);
- if (nr_grefs > XENBUS_MAX_RING_PAGES)
+ if (nr_grefs > XENBUS_MAX_RING_GRANTS)
return -EINVAL;
*vaddr = NULL;
@@ -614,25 +642,22 @@ static int xenbus_map_ring_valloc_hvm(struct xenbus_device *dev,
if (!node)
return -ENOMEM;
- err = alloc_xenballooned_pages(nr_grefs, node->hvm.pages,
- false /* lowmem */);
+ err = alloc_xenballooned_pages(nr_pages, node->hvm.pages);
if (err)
goto out_err;
- for (i = 0; i < nr_grefs; i++) {
- unsigned long pfn = page_to_pfn(node->hvm.pages[i]);
- phys_addrs[i] = (unsigned long)pfn_to_kaddr(pfn);
- addrs[i] = (unsigned long)pfn_to_kaddr(pfn);
- }
+ gnttab_foreach_grant(node->hvm.pages, nr_grefs,
+ xenbus_map_ring_setup_grant_hvm,
+ &info);
err = __xenbus_map_ring(dev, gnt_ref, nr_grefs, node->handles,
- phys_addrs, GNTMAP_host_map, &leaked);
+ info.phys_addrs, GNTMAP_host_map, &leaked);
node->nr_handles = nr_grefs;
if (err)
goto out_free_ballooned_pages;
- addr = vmap(node->hvm.pages, nr_grefs, VM_MAP | VM_IOREMAP,
+ addr = vmap(node->hvm.pages, nr_pages, VM_MAP | VM_IOREMAP,
PAGE_KERNEL);
if (!addr) {
err = -ENOMEM;
@@ -650,14 +675,13 @@ static int xenbus_map_ring_valloc_hvm(struct xenbus_device *dev,
out_xenbus_unmap_ring:
if (!leaked)
- xenbus_unmap_ring(dev, node->handles, node->nr_handles,
- addrs);
+ xenbus_unmap_ring(dev, node->handles, nr_grefs, info.addrs);
else
pr_alert("leaking %p size %u page(s)",
- addr, nr_grefs);
+ addr, nr_pages);
out_free_ballooned_pages:
if (!leaked)
- free_xenballooned_pages(nr_grefs, node->hvm.pages);
+ free_xenballooned_pages(nr_pages, node->hvm.pages);
out_err:
kfree(node);
return err;
@@ -687,10 +711,10 @@ int xenbus_map_ring(struct xenbus_device *dev, grant_ref_t *gnt_refs,
unsigned int nr_grefs, grant_handle_t *handles,
unsigned long *vaddrs, bool *leaked)
{
- phys_addr_t phys_addrs[XENBUS_MAX_RING_PAGES];
+ phys_addr_t phys_addrs[XENBUS_MAX_RING_GRANTS];
int i;
- if (nr_grefs > XENBUS_MAX_RING_PAGES)
+ if (nr_grefs > XENBUS_MAX_RING_GRANTS)
return -EINVAL;
for (i = 0; i < nr_grefs; i++)
@@ -723,7 +747,7 @@ EXPORT_SYMBOL_GPL(xenbus_unmap_ring_vfree);
static int xenbus_unmap_ring_vfree_pv(struct xenbus_device *dev, void *vaddr)
{
struct xenbus_map_node *node;
- struct gnttab_unmap_grant_ref unmap[XENBUS_MAX_RING_PAGES];
+ struct gnttab_unmap_grant_ref unmap[XENBUS_MAX_RING_GRANTS];
unsigned int level;
int i;
bool leaked = false;
@@ -750,7 +774,7 @@ static int xenbus_unmap_ring_vfree_pv(struct xenbus_device *dev, void *vaddr)
unsigned long addr;
memset(&unmap[i], 0, sizeof(unmap[i]));
- addr = (unsigned long)vaddr + (PAGE_SIZE * i);
+ addr = (unsigned long)vaddr + (XEN_PAGE_SIZE * i);
unmap[i].host_addr = arbitrary_virt_to_machine(
lookup_address(addr, &level)).maddr;
unmap[i].dev_bus_addr = 0;
@@ -783,13 +807,33 @@ static int xenbus_unmap_ring_vfree_pv(struct xenbus_device *dev, void *vaddr)
return err;
}
+struct unmap_ring_vfree_hvm
+{
+ unsigned int idx;
+ unsigned long addrs[XENBUS_MAX_RING_GRANTS];
+};
+
+static void xenbus_unmap_ring_setup_grant_hvm(unsigned long gfn,
+ unsigned int goffset,
+ unsigned int len,
+ void *data)
+{
+ struct unmap_ring_vfree_hvm *info = data;
+
+ info->addrs[info->idx] = (unsigned long)gfn_to_virt(gfn);
+
+ info->idx++;
+}
+
static int xenbus_unmap_ring_vfree_hvm(struct xenbus_device *dev, void *vaddr)
{
int rv;
struct xenbus_map_node *node;
void *addr;
- unsigned long addrs[XENBUS_MAX_RING_PAGES];
- int i;
+ struct unmap_ring_vfree_hvm info = {
+ .idx = 0,
+ };
+ unsigned int nr_pages;
spin_lock(&xenbus_valloc_lock);
list_for_each_entry(node, &xenbus_valloc_pages, next) {
@@ -809,18 +853,20 @@ static int xenbus_unmap_ring_vfree_hvm(struct xenbus_device *dev, void *vaddr)
return GNTST_bad_virt_addr;
}
- for (i = 0; i < node->nr_handles; i++)
- addrs[i] = (unsigned long)pfn_to_kaddr(page_to_pfn(node->hvm.pages[i]));
+ nr_pages = XENBUS_PAGES(node->nr_handles);
+
+ gnttab_foreach_grant(node->hvm.pages, node->nr_handles,
+ xenbus_unmap_ring_setup_grant_hvm,
+ &info);
rv = xenbus_unmap_ring(dev, node->handles, node->nr_handles,
- addrs);
+ info.addrs);
if (!rv) {
vunmap(vaddr);
- free_xenballooned_pages(node->nr_handles, node->hvm.pages);
+ free_xenballooned_pages(nr_pages, node->hvm.pages);
}
else
- WARN(1, "Leaking %p, size %u page(s)\n", vaddr,
- node->nr_handles);
+ WARN(1, "Leaking %p, size %u page(s)\n", vaddr, nr_pages);
kfree(node);
return rv;
@@ -841,11 +887,11 @@ int xenbus_unmap_ring(struct xenbus_device *dev,
grant_handle_t *handles, unsigned int nr_handles,
unsigned long *vaddrs)
{
- struct gnttab_unmap_grant_ref unmap[XENBUS_MAX_RING_PAGES];
+ struct gnttab_unmap_grant_ref unmap[XENBUS_MAX_RING_GRANTS];
int i;
int err;
- if (nr_handles > XENBUS_MAX_RING_PAGES)
+ if (nr_handles > XENBUS_MAX_RING_GRANTS)
return -EINVAL;
for (i = 0; i < nr_handles; i++)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 14:56:34 +0000