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devobj: allow arbitrary size device file mappings

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This commit is contained in:
Balazs Gerofi
2016-07-12 17:02:19 +09:00
parent c43d993a4d
commit 01d9d9a5ba
1 changed files with 16 additions and 16 deletions
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32
kernel/devobj.c
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@ -86,30 +86,27 @@ int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxp
int error;
struct devobj *obj = NULL;
const size_t npages = (len + PAGE_SIZE - 1) / PAGE_SIZE;
const size_t pfn_npages = (npages / (PAGE_SIZE / sizeof(uintptr_t))) + 1;
dkprintf("devobj_create(%d,%lx,%lx)\n", fd, len, off);
#define MAX_PAGES_IN_DEVOBJ (PAGE_SIZE / sizeof(uintptr_t))
if (npages > MAX_PAGES_IN_DEVOBJ) {
error = -EFBIG;
kprintf("devobj_create(%d,%lx,%lx):too large len. %d\n", fd, len, off, error);
goto out;
}
dkprintf("%s: fd: %d, len: %lu, off: %lu \n", __FUNCTION__, fd, len, off);
obj = kmalloc(sizeof(*obj), IHK_MC_AP_NOWAIT);
if (!obj) {
error = -ENOMEM;
kprintf("devobj_create(%d,%lx,%lx):kmalloc failed. %d\n", fd, len, off, error);
kprintf("%s: error: fd: %d, len: %lu, off: %lu kmalloc failed.\n",
__FUNCTION__, fd, len, off);
goto out;
}
memset(obj, 0, sizeof(*obj));
obj->pfn_table = allocate_pages(1, IHK_MC_AP_NOWAIT);
obj->pfn_table = allocate_pages(pfn_npages, IHK_MC_AP_NOWAIT);
if (!obj->pfn_table) {
error = -ENOMEM;
kprintf("devobj_create(%d,%lx,%lx):allocate_pages failed. %d\n", fd, len, off, error);
kprintf("%s: error: fd: %d, len: %lu, off: %lu allocating PFN failed.\n",
__FUNCTION__, fd, len, off);
goto out;
}
memset(obj->pfn_table, 0, 1*PAGE_SIZE);
memset(obj->pfn_table, 0, pfn_npages * PAGE_SIZE);
ihk_mc_syscall_arg0(&ctx) = PAGER_REQ_MAP;
ihk_mc_syscall_arg1(&ctx) = fd;
@ -120,11 +117,13 @@ int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxp
error = syscall_generic_forwarding(__NR_mmap, &ctx);
if (error) {
kprintf("devobj_create(%d,%lx,%lx):map failed. %d\n", fd, len, off, error);
kprintf("%s: error: fd: %d, len: %lu, off: %lu map failed.\n",
__FUNCTION__, fd, len, off);
goto out;
}
dkprintf("devobj_create:handle: %lx\n", result.handle);
dkprintf("devobj_create:maxprot: %x\n", result.maxprot);
dkprintf("%s: fd: %d, len: %lu, off: %lu, handle: %p, maxprot: %x\n",
__FUNCTION__, fd, len, off, result.handle, result.maxprot);
obj->memobj.ops = &devobj_ops;
obj->memobj.flags = MF_HAS_PAGER;
@ -142,11 +141,12 @@ int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxp
out:
if (obj) {
if (obj->pfn_table) {
free_pages(obj->pfn_table, 1);
free_pages(obj->pfn_table, pfn_npages);
}
kfree(obj);
}
dkprintf("devobj_create(%d,%lx,%lx): %d %p %x%d\n", fd, len, off, error, *objp, *maxprotp);
dkprintf("%s: ret: %d, fd: %d, len: %lu, off: %lu, handle: %p, maxprot: %x \n",
__FUNCTION__, error, fd, len, off, result.handle, result.maxprot);
return error;
}