diff options
Diffstat (limited to 'arch/ia64/xen/grant-table.c')
| -rw-r--r-- | arch/ia64/xen/grant-table.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/arch/ia64/xen/grant-table.c b/arch/ia64/xen/grant-table.c new file mode 100644 index 000000000000..777dd9a9108b --- /dev/null +++ b/arch/ia64/xen/grant-table.c @@ -0,0 +1,155 @@ +/****************************************************************************** + * 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/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); |