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shmobj: implement lookup_page method

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NAKAMURA Gou
2016-03-14 18:36:05 +09:00
parent bd7dddd415
commit 72f2e5ebe0
1 changed files with 59 additions and 0 deletions
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59
kernel/shmobj.c
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@ -34,12 +34,14 @@ static memobj_release_func_t shmobj_release;
static memobj_ref_func_t shmobj_ref;
static memobj_get_page_func_t shmobj_get_page;
static memobj_invalidate_page_func_t shmobj_invalidate_page;
static memobj_lookup_page_func_t shmobj_lookup_page;
static struct memobj_ops shmobj_ops = {
.release = &shmobj_release,
.ref = &shmobj_ref,
.get_page = &shmobj_get_page,
.invalidate_page = &shmobj_invalidate_page,
.lookup_page = &shmobj_lookup_page,
};
static struct shmobj *to_shmobj(struct memobj *memobj)
@ -451,3 +453,60 @@ out:
dkprintf("shmobj_invalidate_page(%p,%#lx,%#lx):%d\n", memobj, phys, pgsize, error);
return error;
}
static int shmobj_lookup_page(struct memobj *memobj, off_t off, int p2align,
uintptr_t *physp, unsigned long *pflag)
{
struct shmobj *obj = to_shmobj(memobj);
int error;
struct page *page;
uintptr_t phys;
dkprintf("shmobj_lookup_page(%p,%#lx,%d,%p)\n",
memobj, off, p2align, physp);
memobj_lock(&obj->memobj);
if (off & ~PAGE_MASK) {
error = -EINVAL;
ekprintf("shmobj_lookup_page(%p,%#lx,%d,%p):invalid argument. %d\n",
memobj, off, p2align, physp, error);
goto out;
}
if (p2align != PAGE_P2ALIGN) { /* XXX:NYI:large pages */
error = -ENOMEM;
ekprintf("shmobj_lookup_page(%p,%#lx,%d,%p):large page. %d\n",
memobj, off, p2align, physp, error);
goto out;
}
if (obj->real_segsz <= off) {
error = -ERANGE;
ekprintf("shmobj_lookup_page(%p,%#lx,%d,%p):beyond the end. %d\n",
memobj, off, p2align, physp, error);
goto out;
}
if ((obj->real_segsz - off) < (PAGE_SIZE << p2align)) {
error = -ENOSPC;
ekprintf("shmobj_lookup_page(%p,%#lx,%d,%p):too large. %d\n",
memobj, off, p2align, physp, error);
goto out;
}
page = page_list_lookup(obj, off);
if (!page) {
error = -ENOENT;
dkprintf("shmobj_lookup_page(%p,%#lx,%d,%p):page not found. %d\n",
memobj, off, p2align, physp, error);
goto out;
}
phys = page_to_phys(page);
error = 0;
if (physp) {
*physp = phys;
}
out:
memobj_unlock(&obj->memobj);
dkprintf("shmobj_lookup_page(%p,%#lx,%d,%p):%d %#lx\n",
memobj, off, p2align, physp, error, phys);
return error;
} /* shmobj_lookup_page() */