157 lines
4.0 KiB
C
157 lines
4.0 KiB
C
/******************************************************************************
|
|
* arch/ia64/xen/grant-table.c
|
|
*
|
|
* Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
|
|
* VA Linux Systems Japan K.K.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mm.h>
|
|
|
|
#include <xen/interface/xen.h>
|
|
#include <xen/interface/memory.h>
|
|
#include <xen/grant_table.h>
|
|
|
|
#include <asm/xen/hypervisor.h>
|
|
|
|
struct vm_struct *xen_alloc_vm_area(unsigned long size)
|
|
{
|
|
int order;
|
|
unsigned long virt;
|
|
unsigned long nr_pages;
|
|
struct vm_struct *area;
|
|
|
|
order = get_order(size);
|
|
virt = __get_free_pages(GFP_KERNEL, order);
|
|
if (virt == 0)
|
|
goto err0;
|
|
nr_pages = 1 << order;
|
|
scrub_pages(virt, nr_pages);
|
|
|
|
area = kmalloc(sizeof(*area), GFP_KERNEL);
|
|
if (area == NULL)
|
|
goto err1;
|
|
|
|
area->flags = VM_IOREMAP;
|
|
area->addr = (void *)virt;
|
|
area->size = size;
|
|
area->pages = NULL;
|
|
area->nr_pages = nr_pages;
|
|
area->phys_addr = 0; /* xenbus_map_ring_valloc uses this field! */
|
|
|
|
return area;
|
|
|
|
err1:
|
|
free_pages(virt, order);
|
|
err0:
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_alloc_vm_area);
|
|
|
|
void xen_free_vm_area(struct vm_struct *area)
|
|
{
|
|
unsigned int order = get_order(area->size);
|
|
unsigned long i;
|
|
unsigned long phys_addr = __pa(area->addr);
|
|
|
|
/* This area is used for foreign page mappping.
|
|
* So underlying machine page may not be assigned. */
|
|
for (i = 0; i < (1 << order); i++) {
|
|
unsigned long ret;
|
|
unsigned long gpfn = (phys_addr >> PAGE_SHIFT) + i;
|
|
struct xen_memory_reservation reservation = {
|
|
.nr_extents = 1,
|
|
.address_bits = 0,
|
|
.extent_order = 0,
|
|
.domid = DOMID_SELF
|
|
};
|
|
set_xen_guest_handle(reservation.extent_start, &gpfn);
|
|
ret = HYPERVISOR_memory_op(XENMEM_populate_physmap,
|
|
&reservation);
|
|
BUG_ON(ret != 1);
|
|
}
|
|
free_pages((unsigned long)area->addr, order);
|
|
kfree(area);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_free_vm_area);
|
|
|
|
|
|
/****************************************************************************
|
|
* grant table hack
|
|
* cmd: GNTTABOP_xxx
|
|
*/
|
|
|
|
int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
|
|
unsigned long max_nr_gframes,
|
|
struct grant_entry **__shared)
|
|
{
|
|
*__shared = __va(frames[0] << PAGE_SHIFT);
|
|
return 0;
|
|
}
|
|
|
|
void arch_gnttab_unmap_shared(struct grant_entry *shared,
|
|
unsigned long nr_gframes)
|
|
{
|
|
/* nothing */
|
|
}
|
|
|
|
static void
|
|
gnttab_map_grant_ref_pre(struct gnttab_map_grant_ref *uop)
|
|
{
|
|
uint32_t flags;
|
|
|
|
flags = uop->flags;
|
|
|
|
if (flags & GNTMAP_host_map) {
|
|
if (flags & GNTMAP_application_map) {
|
|
printk(KERN_DEBUG
|
|
"GNTMAP_application_map is not supported yet: "
|
|
"flags 0x%x\n", flags);
|
|
BUG();
|
|
}
|
|
if (flags & GNTMAP_contains_pte) {
|
|
printk(KERN_DEBUG
|
|
"GNTMAP_contains_pte is not supported yet: "
|
|
"flags 0x%x\n", flags);
|
|
BUG();
|
|
}
|
|
} else if (flags & GNTMAP_device_map) {
|
|
printk("GNTMAP_device_map is not supported yet 0x%x\n", flags);
|
|
BUG(); /* not yet. actually this flag is not used. */
|
|
} else {
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
int
|
|
HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
|
|
{
|
|
if (cmd == GNTTABOP_map_grant_ref) {
|
|
unsigned int i;
|
|
for (i = 0; i < count; i++) {
|
|
gnttab_map_grant_ref_pre(
|
|
(struct gnttab_map_grant_ref *)uop + i);
|
|
}
|
|
}
|
|
return xencomm_hypercall_grant_table_op(cmd, uop, count);
|
|
}
|
|
|
|
EXPORT_SYMBOL(HYPERVISOR_grant_table_op);
|