[linux-2.6-block.git] / arch / ia64 / xen / grant-table.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/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);
Commit	Line	Data
7ad86313 IY	1	/******************************************************************************
	2	* arch/ia64/xen/grant-table.c
	3	*
	4	* Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
	5	* VA Linux Systems Japan K.K.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/vmalloc.h>
	25	#include <linux/mm.h>
	26
	27	#include <xen/interface/xen.h>
	28	#include <xen/interface/memory.h>
	29	#include <xen/grant_table.h>
	30
	31	#include <asm/xen/hypervisor.h>
	32
	33	struct vm_struct *xen_alloc_vm_area(unsigned long size)
	34	{
	35	int order;
	36	unsigned long virt;
	37	unsigned long nr_pages;
	38	struct vm_struct *area;
	39
	40	order = get_order(size);
	41	virt = __get_free_pages(GFP_KERNEL, order);
	42	if (virt == 0)
	43	goto err0;
	44	nr_pages = 1 << order;
	45	scrub_pages(virt, nr_pages);
	46
	47	area = kmalloc(sizeof(*area), GFP_KERNEL);
	48	if (area == NULL)
	49	goto err1;
	50
	51	area->flags = VM_IOREMAP;
	52	area->addr = (void *)virt;
	53	area->size = size;
	54	area->pages = NULL;
	55	area->nr_pages = nr_pages;
	56	area->phys_addr = 0; /* xenbus_map_ring_valloc uses this field! */
	57
	58	return area;
	59
	60	err1:
	61	free_pages(virt, order);
	62	err0:
	63	return NULL;
	64	}
65	EXPORT_SYMBOL_GPL(xen_alloc_vm_area);
66
67	void xen_free_vm_area(struct vm_struct *area)
68	{
69	unsigned int order = get_order(area->size);
70	unsigned long i;
71	unsigned long phys_addr = __pa(area->addr);
72
73	/* This area is used for foreign page mappping.
74	* So underlying machine page may not be assigned. */
75	for (i = 0; i < (1 << order); i++) {
76	unsigned long ret;
77	unsigned long gpfn = (phys_addr >> PAGE_SHIFT) + i;
78	struct xen_memory_reservation reservation = {
79	.nr_extents = 1,
80	.address_bits = 0,
81	.extent_order = 0,
82	.domid = DOMID_SELF
83	};
84	set_xen_guest_handle(reservation.extent_start, &gpfn);
85	ret = HYPERVISOR_memory_op(XENMEM_populate_physmap,
86	&reservation);
87	BUG_ON(ret != 1);
88	}
89	free_pages((unsigned long)area->addr, order);
90	kfree(area);
91	}
92	EXPORT_SYMBOL_GPL(xen_free_vm_area);
93
94
95	/****************************************************************************
96	* grant table hack
97	* cmd: GNTTABOP_xxx
98	*/
99
100	int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
101	unsigned long max_nr_gframes,
102	struct grant_entry **__shared)
103	{
104	*__shared = __va(frames[0] << PAGE_SHIFT);
105	return 0;
106	}
107
108	void arch_gnttab_unmap_shared(struct grant_entry *shared,
109	unsigned long nr_gframes)
110	{
111	/* nothing */
112	}
113
114	static void
115	gnttab_map_grant_ref_pre(struct gnttab_map_grant_ref *uop)
116	{
117	uint32_t flags;
118
119	flags = uop->flags;
120
121	if (flags & GNTMAP_host_map) {
122	if (flags & GNTMAP_application_map) {
123	printk(KERN_DEBUG
124	"GNTMAP_application_map is not supported yet: "
125	"flags 0x%x\n", flags);
126	BUG();
127	}
128	if (flags & GNTMAP_contains_pte) {
129	printk(KERN_DEBUG
130	"GNTMAP_contains_pte is not supported yet: "
131	"flags 0x%x\n", flags);
132	BUG();
133	}
134	} else if (flags & GNTMAP_device_map) {
135	printk("GNTMAP_device_map is not supported yet 0x%x\n", flags);
136	BUG(); /* not yet. actually this flag is not used. */
137	} else {
138	BUG();
139	}
140	}
141
142	int
143	HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
144	{
145	if (cmd == GNTTABOP_map_grant_ref) {
146	unsigned int i;
147	for (i = 0; i < count; i++) {
148	gnttab_map_grant_ref_pre(
149	(struct gnttab_map_grant_ref *)uop + i);
150	}
151	}
152	return xencomm_hypercall_grant_table_op(cmd, uop, count);
153	}
154
155	EXPORT_SYMBOL(HYPERVISOR_grant_table_op);