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xen: make grant table arch portable

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split out x86 specific part from grant-table.c and
allow ia64/xen specific initialization.
ia64/xen grant table is based on pseudo physical address
(guest physical address) unlike x86/xen. On ia64 init_mm
doesn't map identity straight mapped area.
ia64/xen specific grant table initialization is necessary.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Isaku Yamahata
2008-04-02 10:54:00 -07:00
committed by Ingo Molnar
parent 5f0ababbf4
commit 8d3d2106c1
4 changed files with 101 additions and 33 deletions
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35
drivers/xen/grant-table.c
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@@ -439,24 +439,6 @@ static inline unsigned int max_nr_grant_frames(void)
return xen_max;
}
static int map_pte_fn(pte_t *pte, struct page *pmd_page,
unsigned long addr, void *data)
{
unsigned long **frames = (unsigned long **)data;
set_pte_at(&init_mm, addr, pte, mfn_pte((*frames)[0], PAGE_KERNEL));
(*frames)++;
return 0;
}
static int unmap_pte_fn(pte_t *pte, struct page *pmd_page,
unsigned long addr, void *data)
{
set_pte_at(&init_mm, addr, pte, __pte(0));
return 0;
}
static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
{
struct gnttab_setup_table setup;
@@ -480,17 +462,9 @@ static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
BUG_ON(rc || setup.status);
if (shared == NULL) {
struct vm_struct *area;
area = xen_alloc_vm_area(PAGE_SIZE * max_nr_grant_frames());
BUG_ON(area == NULL);
shared = area->addr;
}
rc = apply_to_page_range(&init_mm, (unsigned long)shared,
PAGE_SIZE * nr_gframes,
map_pte_fn, &frames);
rc = arch_gnttab_map_shared(frames, nr_gframes, max_nr_grant_frames(),
&shared);
BUG_ON(rc);
frames -= nr_gframes; /* adjust after map_pte_fn() */
kfree(frames);
@@ -506,10 +480,7 @@ static int gnttab_resume(void)
static int gnttab_suspend(void)
{
apply_to_page_range(&init_mm, (unsigned long)shared,
PAGE_SIZE * nr_grant_frames,
unmap_pte_fn, NULL);
arch_gnttab_unmap_shared(shared, nr_grant_frames);
return 0;
}