Merge branch 'core-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 EFI update from Peter Anvin:
 "EFI tree, from Matt Fleming.  Most of the patches are the new efivarfs
  filesystem by Matt Garrett & co.  The balance are support for EFI
  wallclock in the absence of a hardware-specific driver, and various
  fixes and cleanups."

* 'core-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
  efivarfs: Make efivarfs_fill_super() static
  x86, efi: Check table header length in efi_bgrt_init()
  efivarfs: Use query_variable_info() to limit kmalloc()
  efivarfs: Fix return value of efivarfs_file_write()
  efivarfs: Return a consistent error when efivarfs_get_inode() fails
  efivarfs: Make 'datasize' unsigned long
  efivarfs: Add unique magic number
  efivarfs: Replace magic number with sizeof(attributes)
  efivarfs: Return an error if we fail to read a variable
  efi: Clarify GUID length calculations
  efivarfs: Implement exclusive access for {get,set}_variable
  efivarfs: efivarfs_fill_super() ensure we clean up correctly on error
  efivarfs: efivarfs_fill_super() ensure we free our temporary name
  efivarfs: efivarfs_fill_super() fix inode reference counts
  efivarfs: efivarfs_create() ensure we drop our reference on inode on error
  efivarfs: efivarfs_file_read ensure we free data in error paths
  x86-64/efi: Use EFI to deal with platform wall clock (again)
  x86/kernel: remove tboot 1:1 page table creation code
  x86, efi: 1:1 pagetable mapping for virtual EFI calls
  x86, mm: Include the entire kernel memory map in trampoline_pgd
  ...
This commit is contained in:
Linus Torvalds 2012-12-14 10:08:40 -08:00
commit d42b3a2906
15 changed files with 714 additions and 127 deletions

View File

@ -38,6 +38,8 @@ dnotify_test.c
- example program for dnotify
ecryptfs.txt
- docs on eCryptfs: stacked cryptographic filesystem for Linux.
efivarfs.txt
- info for the efivarfs filesystem.
exofs.txt
- info, usage, mount options, design about EXOFS.
ext2.txt

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@ -0,0 +1,16 @@
efivarfs - a (U)EFI variable filesystem
The efivarfs filesystem was created to address the shortcomings of
using entries in sysfs to maintain EFI variables. The old sysfs EFI
variables code only supported variables of up to 1024 bytes. This
limitation existed in version 0.99 of the EFI specification, but was
removed before any full releases. Since variables can now be larger
than a single page, sysfs isn't the best interface for this.
Variables can be created, deleted and modified with the efivarfs
filesystem.
efivarfs is typically mounted like this,
mount -t efivarfs none /sys/firmware/efi/efivars

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@ -69,23 +69,37 @@ extern u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
efi_call6((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3), \
(u64)(a4), (u64)(a5), (u64)(a6))
extern unsigned long efi_call_virt_prelog(void);
extern void efi_call_virt_epilog(unsigned long);
#define efi_callx(x, func, ...) \
({ \
efi_status_t __status; \
unsigned long __pgd; \
\
__pgd = efi_call_virt_prelog(); \
__status = efi_call##x(func, __VA_ARGS__); \
efi_call_virt_epilog(__pgd); \
__status; \
})
#define efi_call_virt0(f) \
efi_call0((void *)(efi.systab->runtime->f))
efi_callx(0, (void *)(efi.systab->runtime->f))
#define efi_call_virt1(f, a1) \
efi_call1((void *)(efi.systab->runtime->f), (u64)(a1))
efi_callx(1, (void *)(efi.systab->runtime->f), (u64)(a1))
#define efi_call_virt2(f, a1, a2) \
efi_call2((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2))
efi_callx(2, (void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2))
#define efi_call_virt3(f, a1, a2, a3) \
efi_call3((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
efi_callx(3, (void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
(u64)(a3))
#define efi_call_virt4(f, a1, a2, a3, a4) \
efi_call4((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
efi_callx(4, (void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
(u64)(a3), (u64)(a4))
#define efi_call_virt5(f, a1, a2, a3, a4, a5) \
efi_call5((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
efi_callx(5, (void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
(u64)(a3), (u64)(a4), (u64)(a5))
#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6) \
efi_call6((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
efi_callx(6, (void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
(u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))
extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,

View File

@ -103,71 +103,13 @@ void __init tboot_probe(void)
pr_debug("tboot_size: 0x%x\n", tboot->tboot_size);
}
static pgd_t *tboot_pg_dir;
static struct mm_struct tboot_mm = {
.mm_rb = RB_ROOT,
.pgd = swapper_pg_dir,
.mm_users = ATOMIC_INIT(2),
.mm_count = ATOMIC_INIT(1),
.mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem),
.page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
.mmlist = LIST_HEAD_INIT(init_mm.mmlist),
};
static inline void switch_to_tboot_pt(void)
{
write_cr3(virt_to_phys(tboot_pg_dir));
}
static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
pgprot_t prot)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pgd = pgd_offset(&tboot_mm, vaddr);
pud = pud_alloc(&tboot_mm, pgd, vaddr);
if (!pud)
return -1;
pmd = pmd_alloc(&tboot_mm, pud, vaddr);
if (!pmd)
return -1;
pte = pte_alloc_map(&tboot_mm, NULL, pmd, vaddr);
if (!pte)
return -1;
set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot));
pte_unmap(pte);
return 0;
}
static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn,
unsigned long nr)
{
/* Reuse the original kernel mapping */
tboot_pg_dir = pgd_alloc(&tboot_mm);
if (!tboot_pg_dir)
return -1;
for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) {
if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC))
return -1;
}
return 0;
}
static void tboot_create_trampoline(void)
{
u32 map_base, map_size;
/* Create identity map for tboot shutdown code. */
map_base = PFN_DOWN(tboot->tboot_base);
map_size = PFN_UP(tboot->tboot_size);
if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size))
panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n",
map_base, map_size);
#ifdef CONFIG_X86_32
load_cr3(initial_page_table);
#else
write_cr3(real_mode_header->trampoline_pgd);
#endif
}
#ifdef CONFIG_ACPI_SLEEP
@ -225,14 +167,6 @@ void tboot_shutdown(u32 shutdown_type)
if (!tboot_enabled())
return;
/*
* if we're being called before the 1:1 mapping is set up then just
* return and let the normal shutdown happen; this should only be
* due to very early panic()
*/
if (!tboot_pg_dir)
return;
/* if this is S3 then set regions to MAC */
if (shutdown_type == TB_SHUTDOWN_S3)
if (tboot_setup_sleep())
@ -343,8 +277,6 @@ static __init int tboot_late_init(void)
if (!tboot_enabled())
return 0;
tboot_create_trampoline();
atomic_set(&ap_wfs_count, 0);
register_hotcpu_notifier(&tboot_cpu_notifier);

View File

@ -108,13 +108,13 @@ void sync_global_pgds(unsigned long start, unsigned long end)
for (address = start; address <= end; address += PGDIR_SIZE) {
const pgd_t *pgd_ref = pgd_offset_k(address);
struct page *page;
pgd_t *pgd;
if (pgd_none(*pgd_ref))
continue;
spin_lock(&pgd_lock);
list_for_each_entry(page, &pgd_list, lru) {
pgd_t *pgd;
spinlock_t *pgt_lock;
pgd = (pgd_t *)page_address(page) + pgd_index(address);
@ -130,6 +130,13 @@ void sync_global_pgds(unsigned long start, unsigned long end)
spin_unlock(pgt_lock);
}
pgd = __va(real_mode_header->trampoline_pgd);
pgd += pgd_index(address);
if (pgd_none(*pgd))
set_pgd(pgd, *pgd_ref);
spin_unlock(&pgd_lock);
}
}

View File

@ -50,6 +50,107 @@ int ioremap_change_attr(unsigned long vaddr, unsigned long size,
return err;
}
#ifdef CONFIG_X86_64
static void ident_pte_range(unsigned long paddr, unsigned long vaddr,
pmd_t *ppmd, pmd_t *vpmd, unsigned long end)
{
pte_t *ppte = pte_offset_kernel(ppmd, paddr);
pte_t *vpte = pte_offset_kernel(vpmd, vaddr);
do {
set_pte(ppte, *vpte);
} while (ppte++, vpte++, vaddr += PAGE_SIZE, vaddr != end);
}
static int ident_pmd_range(unsigned long paddr, unsigned long vaddr,
pud_t *ppud, pud_t *vpud, unsigned long end)
{
pmd_t *ppmd = pmd_offset(ppud, paddr);
pmd_t *vpmd = pmd_offset(vpud, vaddr);
unsigned long next;
do {
next = pmd_addr_end(vaddr, end);
if (!pmd_present(*ppmd)) {
pte_t *ppte = (pte_t *)get_zeroed_page(GFP_KERNEL);
if (!ppte)
return 1;
set_pmd(ppmd, __pmd(_KERNPG_TABLE | __pa(ppte)));
}
ident_pte_range(paddr, vaddr, ppmd, vpmd, next);
} while (ppmd++, vpmd++, vaddr = next, vaddr != end);
return 0;
}
static int ident_pud_range(unsigned long paddr, unsigned long vaddr,
pgd_t *ppgd, pgd_t *vpgd, unsigned long end)
{
pud_t *ppud = pud_offset(ppgd, paddr);
pud_t *vpud = pud_offset(vpgd, vaddr);
unsigned long next;
do {
next = pud_addr_end(vaddr, end);
if (!pud_present(*ppud)) {
pmd_t *ppmd = (pmd_t *)get_zeroed_page(GFP_KERNEL);
if (!ppmd)
return 1;
set_pud(ppud, __pud(_KERNPG_TABLE | __pa(ppmd)));
}
if (ident_pmd_range(paddr, vaddr, ppud, vpud, next))
return 1;
} while (ppud++, vpud++, vaddr = next, vaddr != end);
return 0;
}
static int insert_identity_mapping(resource_size_t paddr, unsigned long vaddr,
unsigned long size)
{
unsigned long end = vaddr + size;
unsigned long next;
pgd_t *vpgd, *ppgd;
/* Don't map over the guard hole. */
if (paddr >= 0x800000000000 || paddr + size > 0x800000000000)
return 1;
ppgd = __va(real_mode_header->trampoline_pgd) + pgd_index(paddr);
vpgd = pgd_offset_k(vaddr);
do {
next = pgd_addr_end(vaddr, end);
if (!pgd_present(*ppgd)) {
pud_t *ppud = (pud_t *)get_zeroed_page(GFP_KERNEL);
if (!ppud)
return 1;
set_pgd(ppgd, __pgd(_KERNPG_TABLE | __pa(ppud)));
}
if (ident_pud_range(paddr, vaddr, ppgd, vpgd, next))
return 1;
} while (ppgd++, vpgd++, vaddr = next, vaddr != end);
return 0;
}
#else
static inline int insert_identity_mapping(resource_size_t paddr,
unsigned long vaddr,
unsigned long size)
{
return 0;
}
#endif /* CONFIG_X86_64 */
/*
* Remap an arbitrary physical address space into the kernel virtual
* address space. Needed when the kernel wants to access high addresses
@ -163,6 +264,10 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
ret_addr = (void __iomem *) (vaddr + offset);
mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr);
if (insert_identity_mapping(phys_addr, vaddr, size))
printk(KERN_WARNING "ioremap: unable to map 0x%llx in identity pagetable\n",
(unsigned long long)phys_addr);
/*
* Check if the request spans more than any BAR in the iomem resource
* tree.

View File

@ -919,11 +919,13 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
/*
* On success we use clflush, when the CPU supports it to
* avoid the wbindv. If the CPU does not support it and in the
* error case we fall back to cpa_flush_all (which uses
* wbindv):
* avoid the wbindv. If the CPU does not support it, in the
* error case, and during early boot (for EFI) we fall back
* to cpa_flush_all (which uses wbinvd):
*/
if (!ret && cpu_has_clflush) {
if (early_boot_irqs_disabled)
__cpa_flush_all((void *)(long)cache);
else if (!ret && cpu_has_clflush) {
if (cpa.flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) {
cpa_flush_array(addr, numpages, cache,
cpa.flags, pages);

View File

@ -39,6 +39,8 @@ void efi_bgrt_init(void)
if (ACPI_FAILURE(status))
return;
if (bgrt_tab->header.length < sizeof(*bgrt_tab))
return;
if (bgrt_tab->version != 1)
return;
if (bgrt_tab->image_type != 0 || !bgrt_tab->image_address)

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@ -239,22 +239,7 @@ static efi_status_t __init phys_efi_set_virtual_address_map(
return status;
}
static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
efi_time_cap_t *tc)
{
unsigned long flags;
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
efi_call_phys_prelog();
status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm),
virt_to_phys(tc));
efi_call_phys_epilog();
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
int efi_set_rtc_mmss(unsigned long nowtime)
static int efi_set_rtc_mmss(unsigned long nowtime)
{
int real_seconds, real_minutes;
efi_status_t status;
@ -283,7 +268,7 @@ int efi_set_rtc_mmss(unsigned long nowtime)
return 0;
}
unsigned long efi_get_time(void)
static unsigned long efi_get_time(void)
{
efi_status_t status;
efi_time_t eft;
@ -639,18 +624,13 @@ static int __init efi_runtime_init(void)
}
/*
* We will only need *early* access to the following
* two EFI runtime services before set_virtual_address_map
* EFI runtime service before set_virtual_address_map
* is invoked.
*/
efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
efi_phys.set_virtual_address_map =
(efi_set_virtual_address_map_t *)
runtime->set_virtual_address_map;
/*
* Make efi_get_time can be called before entering
* virtual mode.
*/
efi.get_time = phys_efi_get_time;
early_iounmap(runtime, sizeof(efi_runtime_services_t));
return 0;
@ -736,12 +716,10 @@ void __init efi_init(void)
efi_enabled = 0;
return;
}
#ifdef CONFIG_X86_32
if (efi_is_native()) {
x86_platform.get_wallclock = efi_get_time;
x86_platform.set_wallclock = efi_set_rtc_mmss;
}
#endif
#if EFI_DEBUG
print_efi_memmap();

View File

@ -58,6 +58,21 @@ static void __init early_code_mapping_set_exec(int executable)
}
}
unsigned long efi_call_virt_prelog(void)
{
unsigned long saved;
saved = read_cr3();
write_cr3(real_mode_header->trampoline_pgd);
return saved;
}
void efi_call_virt_epilog(unsigned long saved)
{
write_cr3(saved);
}
void __init efi_call_phys_prelog(void)
{
unsigned long vaddress;

View File

@ -78,8 +78,21 @@ void __init setup_real_mode(void)
*trampoline_cr4_features = read_cr4();
trampoline_pgd = (u64 *) __va(real_mode_header->trampoline_pgd);
trampoline_pgd[0] = __pa(level3_ident_pgt) + _KERNPG_TABLE;
trampoline_pgd[511] = __pa(level3_kernel_pgt) + _KERNPG_TABLE;
/*
* Create an identity mapping for all of physical memory.
*/
for (i = 0; i <= pgd_index(max_pfn << PAGE_SHIFT); i++) {
int index = pgd_index(PAGE_OFFSET) + i;
trampoline_pgd[i] = (u64)pgd_val(swapper_pg_dir[index]);
}
/*
* Copy the upper-half of the kernel pages tables.
*/
for (i = pgd_index(PAGE_OFFSET); i < PTRS_PER_PGD; i++)
trampoline_pgd[i] = (u64)pgd_val(swapper_pg_dir[i]);
#endif
}

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@ -80,6 +80,10 @@
#include <linux/slab.h>
#include <linux/pstore.h>
#include <linux/fs.h>
#include <linux/ramfs.h>
#include <linux/pagemap.h>
#include <asm/uaccess.h>
#define EFIVARS_VERSION "0.08"
@ -92,6 +96,12 @@ MODULE_VERSION(EFIVARS_VERSION);
#define DUMP_NAME_LEN 52
/*
* Length of a GUID string (strlen("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"))
* not including trailing NUL
*/
#define GUID_LEN 36
/*
* The maximum size of VariableName + Data = 1024
* Therefore, it's reasonable to save that much
@ -108,7 +118,6 @@ struct efi_variable {
__u32 Attributes;
} __attribute__((packed));
struct efivar_entry {
struct efivars *efivars;
struct efi_variable var;
@ -122,6 +131,9 @@ struct efivar_attribute {
ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count);
};
static struct efivars __efivars;
static struct efivar_operations ops;
#define PSTORE_EFI_ATTRIBUTES \
(EFI_VARIABLE_NON_VOLATILE | \
EFI_VARIABLE_BOOTSERVICE_ACCESS | \
@ -629,14 +641,482 @@ static struct kobj_type efivar_ktype = {
.default_attrs = def_attrs,
};
static struct pstore_info efi_pstore_info;
static inline void
efivar_unregister(struct efivar_entry *var)
{
kobject_put(&var->kobj);
}
static int efivarfs_file_open(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
static int efi_status_to_err(efi_status_t status)
{
int err;
switch (status) {
case EFI_INVALID_PARAMETER:
err = -EINVAL;
break;
case EFI_OUT_OF_RESOURCES:
err = -ENOSPC;
break;
case EFI_DEVICE_ERROR:
err = -EIO;
break;
case EFI_WRITE_PROTECTED:
err = -EROFS;
break;
case EFI_SECURITY_VIOLATION:
err = -EACCES;
break;
case EFI_NOT_FOUND:
err = -ENOENT;
break;
default:
err = -EINVAL;
}
return err;
}
static ssize_t efivarfs_file_write(struct file *file,
const char __user *userbuf, size_t count, loff_t *ppos)
{
struct efivar_entry *var = file->private_data;
struct efivars *efivars;
efi_status_t status;
void *data;
u32 attributes;
struct inode *inode = file->f_mapping->host;
unsigned long datasize = count - sizeof(attributes);
unsigned long newdatasize;
u64 storage_size, remaining_size, max_size;
ssize_t bytes = 0;
if (count < sizeof(attributes))
return -EINVAL;
if (copy_from_user(&attributes, userbuf, sizeof(attributes)))
return -EFAULT;
if (attributes & ~(EFI_VARIABLE_MASK))
return -EINVAL;
efivars = var->efivars;
/*
* Ensure that the user can't allocate arbitrarily large
* amounts of memory. Pick a default size of 64K if
* QueryVariableInfo() isn't supported by the firmware.
*/
spin_lock(&efivars->lock);
if (!efivars->ops->query_variable_info)
status = EFI_UNSUPPORTED;
else {
const struct efivar_operations *fops = efivars->ops;
status = fops->query_variable_info(attributes, &storage_size,
&remaining_size, &max_size);
}
spin_unlock(&efivars->lock);
if (status != EFI_SUCCESS) {
if (status != EFI_UNSUPPORTED)
return efi_status_to_err(status);
remaining_size = 65536;
}
if (datasize > remaining_size)
return -ENOSPC;
data = kmalloc(datasize, GFP_KERNEL);
if (!data)
return -ENOMEM;
if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) {
bytes = -EFAULT;
goto out;
}
if (validate_var(&var->var, data, datasize) == false) {
bytes = -EINVAL;
goto out;
}
/*
* The lock here protects the get_variable call, the conditional
* set_variable call, and removal of the variable from the efivars
* list (in the case of an authenticated delete).
*/
spin_lock(&efivars->lock);
status = efivars->ops->set_variable(var->var.VariableName,
&var->var.VendorGuid,
attributes, datasize,
data);
if (status != EFI_SUCCESS) {
spin_unlock(&efivars->lock);
kfree(data);
return efi_status_to_err(status);
}
bytes = count;
/*
* Writing to the variable may have caused a change in size (which
* could either be an append or an overwrite), or the variable to be
* deleted. Perform a GetVariable() so we can tell what actually
* happened.
*/
newdatasize = 0;
status = efivars->ops->get_variable(var->var.VariableName,
&var->var.VendorGuid,
NULL, &newdatasize,
NULL);
if (status == EFI_BUFFER_TOO_SMALL) {
spin_unlock(&efivars->lock);
mutex_lock(&inode->i_mutex);
i_size_write(inode, newdatasize + sizeof(attributes));
mutex_unlock(&inode->i_mutex);
} else if (status == EFI_NOT_FOUND) {
list_del(&var->list);
spin_unlock(&efivars->lock);
efivar_unregister(var);
drop_nlink(inode);
dput(file->f_dentry);
} else {
spin_unlock(&efivars->lock);
pr_warn("efivarfs: inconsistent EFI variable implementation? "
"status = %lx\n", status);
}
out:
kfree(data);
return bytes;
}
static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct efivar_entry *var = file->private_data;
struct efivars *efivars = var->efivars;
efi_status_t status;
unsigned long datasize = 0;
u32 attributes;
void *data;
ssize_t size = 0;
spin_lock(&efivars->lock);
status = efivars->ops->get_variable(var->var.VariableName,
&var->var.VendorGuid,
&attributes, &datasize, NULL);
spin_unlock(&efivars->lock);
if (status != EFI_BUFFER_TOO_SMALL)
return efi_status_to_err(status);
data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
if (!data)
return -ENOMEM;
spin_lock(&efivars->lock);
status = efivars->ops->get_variable(var->var.VariableName,
&var->var.VendorGuid,
&attributes, &datasize,
(data + sizeof(attributes)));
spin_unlock(&efivars->lock);
if (status != EFI_SUCCESS) {
size = efi_status_to_err(status);
goto out_free;
}
memcpy(data, &attributes, sizeof(attributes));
size = simple_read_from_buffer(userbuf, count, ppos,
data, datasize + sizeof(attributes));
out_free:
kfree(data);
return size;
}
static void efivarfs_evict_inode(struct inode *inode)
{
clear_inode(inode);
}
static const struct super_operations efivarfs_ops = {
.statfs = simple_statfs,
.drop_inode = generic_delete_inode,
.evict_inode = efivarfs_evict_inode,
.show_options = generic_show_options,
};
static struct super_block *efivarfs_sb;
static const struct inode_operations efivarfs_dir_inode_operations;
static const struct file_operations efivarfs_file_operations = {
.open = efivarfs_file_open,
.read = efivarfs_file_read,
.write = efivarfs_file_write,
.llseek = no_llseek,
};
static struct inode *efivarfs_get_inode(struct super_block *sb,
const struct inode *dir, int mode, dev_t dev)
{
struct inode *inode = new_inode(sb);
if (inode) {
inode->i_ino = get_next_ino();
inode->i_uid = inode->i_gid = 0;
inode->i_mode = mode;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
switch (mode & S_IFMT) {
case S_IFREG:
inode->i_fop = &efivarfs_file_operations;
break;
case S_IFDIR:
inode->i_op = &efivarfs_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
inc_nlink(inode);
break;
}
}
return inode;
}
static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid)
{
guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]);
guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]);
guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]);
guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]);
guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]);
guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]);
guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]);
guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]);
guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]);
guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]);
guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]);
guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]);
guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]);
guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]);
guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]);
guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]);
}
static int efivarfs_create(struct inode *dir, struct dentry *dentry,
umode_t mode, bool excl)
{
struct inode *inode;
struct efivars *efivars = &__efivars;
struct efivar_entry *var;
int namelen, i = 0, err = 0;
/*
* We need a GUID, plus at least one letter for the variable name,
* plus the '-' separator
*/
if (dentry->d_name.len < GUID_LEN + 2)
return -EINVAL;
inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0);
if (!inode)
return -ENOMEM;
var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL);
if (!var) {
err = -ENOMEM;
goto out;
}
/* length of the variable name itself: remove GUID and separator */
namelen = dentry->d_name.len - GUID_LEN - 1;
efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1,
&var->var.VendorGuid);
for (i = 0; i < namelen; i++)
var->var.VariableName[i] = dentry->d_name.name[i];
var->var.VariableName[i] = '\0';
inode->i_private = var;
var->efivars = efivars;
var->kobj.kset = efivars->kset;
err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s",
dentry->d_name.name);
if (err)
goto out;
kobject_uevent(&var->kobj, KOBJ_ADD);
spin_lock(&efivars->lock);
list_add(&var->list, &efivars->list);
spin_unlock(&efivars->lock);
d_instantiate(dentry, inode);
dget(dentry);
out:
if (err) {
kfree(var);
iput(inode);
}
return err;
}
static int efivarfs_unlink(struct inode *dir, struct dentry *dentry)
{
struct efivar_entry *var = dentry->d_inode->i_private;
struct efivars *efivars = var->efivars;
efi_status_t status;
spin_lock(&efivars->lock);
status = efivars->ops->set_variable(var->var.VariableName,
&var->var.VendorGuid,
0, 0, NULL);
if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) {
list_del(&var->list);
spin_unlock(&efivars->lock);
efivar_unregister(var);
drop_nlink(dir);
dput(dentry);
return 0;
}
spin_unlock(&efivars->lock);
return -EINVAL;
};
static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
{
struct inode *inode = NULL;
struct dentry *root;
struct efivar_entry *entry, *n;
struct efivars *efivars = &__efivars;
char *name;
efivarfs_sb = sb;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = EFIVARFS_MAGIC;
sb->s_op = &efivarfs_ops;
sb->s_time_gran = 1;
inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0);
if (!inode)
return -ENOMEM;
inode->i_op = &efivarfs_dir_inode_operations;
root = d_make_root(inode);
sb->s_root = root;
if (!root)
return -ENOMEM;
list_for_each_entry_safe(entry, n, &efivars->list, list) {
struct dentry *dentry, *root = efivarfs_sb->s_root;
unsigned long size = 0;
int len, i;
inode = NULL;
len = utf16_strlen(entry->var.VariableName);
/* name, plus '-', plus GUID, plus NUL*/
name = kmalloc(len + 1 + GUID_LEN + 1, GFP_ATOMIC);
if (!name)
goto fail;
for (i = 0; i < len; i++)
name[i] = entry->var.VariableName[i] & 0xFF;
name[len] = '-';
efi_guid_unparse(&entry->var.VendorGuid, name + len + 1);
name[len+GUID_LEN+1] = '\0';
inode = efivarfs_get_inode(efivarfs_sb, root->d_inode,
S_IFREG | 0644, 0);
if (!inode)
goto fail_name;
dentry = d_alloc_name(root, name);
if (!dentry)
goto fail_inode;
/* copied by the above to local storage in the dentry. */
kfree(name);
spin_lock(&efivars->lock);
efivars->ops->get_variable(entry->var.VariableName,
&entry->var.VendorGuid,
&entry->var.Attributes,
&size,
NULL);
spin_unlock(&efivars->lock);
mutex_lock(&inode->i_mutex);
inode->i_private = entry;
i_size_write(inode, size+4);
mutex_unlock(&inode->i_mutex);
d_add(dentry, inode);
}
return 0;
fail_inode:
iput(inode);
fail_name:
kfree(name);
fail:
return -ENOMEM;
}
static struct dentry *efivarfs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return mount_single(fs_type, flags, data, efivarfs_fill_super);
}
static void efivarfs_kill_sb(struct super_block *sb)
{
kill_litter_super(sb);
efivarfs_sb = NULL;
}
static struct file_system_type efivarfs_type = {
.name = "efivarfs",
.mount = efivarfs_mount,
.kill_sb = efivarfs_kill_sb,
};
static const struct inode_operations efivarfs_dir_inode_operations = {
.lookup = simple_lookup,
.unlink = efivarfs_unlink,
.create = efivarfs_create,
};
static struct pstore_info efi_pstore_info;
#ifdef CONFIG_PSTORE
static int efi_pstore_open(struct pstore_info *psi)
@ -1065,11 +1545,18 @@ efivar_create_sysfs_entry(struct efivars *efivars,
efi_char16_t *variable_name,
efi_guid_t *vendor_guid)
{
int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38;
int i, short_name_size;
char *short_name;
struct efivar_entry *new_efivar;
short_name = kzalloc(short_name_size + 1, GFP_KERNEL);
/*
* Length of the variable bytes in ASCII, plus the '-' separator,
* plus the GUID, plus trailing NUL
*/
short_name_size = variable_name_size / sizeof(efi_char16_t)
+ 1 + GUID_LEN + 1;
short_name = kzalloc(short_name_size, GFP_KERNEL);
new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL);
if (!short_name || !new_efivar) {
@ -1189,6 +1676,7 @@ void unregister_efivars(struct efivars *efivars)
sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var);
kfree(efivars->new_var);
kfree(efivars->del_var);
kobject_put(efivars->kobject);
kset_unregister(efivars->kset);
}
EXPORT_SYMBOL_GPL(unregister_efivars);
@ -1220,6 +1708,14 @@ int register_efivars(struct efivars *efivars,
goto out;
}
efivars->kobject = kobject_create_and_add("efivars", parent_kobj);
if (!efivars->kobject) {
pr_err("efivars: Subsystem registration failed.\n");
error = -ENOMEM;
kset_unregister(efivars->kset);
goto out;
}
/*
* Per EFI spec, the maximum storage allocated for both
* the variable name and variable data is 1024 bytes.
@ -1262,6 +1758,8 @@ int register_efivars(struct efivars *efivars,
pstore_register(&efivars->efi_pstore_info);
}
register_filesystem(&efivarfs_type);
out:
kfree(variable_name);
@ -1269,9 +1767,6 @@ out:
}
EXPORT_SYMBOL_GPL(register_efivars);
static struct efivars __efivars;
static struct efivar_operations ops;
/*
* For now we register the efi subsystem with the firmware subsystem
* and the vars subsystem with the efi subsystem. In the future, it
@ -1302,6 +1797,7 @@ efivars_init(void)
ops.set_variable = efi.set_variable;
ops.get_next_variable = efi.get_next_variable;
ops.query_variable_info = efi.query_variable_info;
error = register_efivars(&__efivars, &ops, efi_kobj);
if (error)
goto err_put;

View File

@ -29,7 +29,12 @@
#define EFI_UNSUPPORTED ( 3 | (1UL << (BITS_PER_LONG-1)))
#define EFI_BAD_BUFFER_SIZE ( 4 | (1UL << (BITS_PER_LONG-1)))
#define EFI_BUFFER_TOO_SMALL ( 5 | (1UL << (BITS_PER_LONG-1)))
#define EFI_NOT_READY ( 6 | (1UL << (BITS_PER_LONG-1)))
#define EFI_DEVICE_ERROR ( 7 | (1UL << (BITS_PER_LONG-1)))
#define EFI_WRITE_PROTECTED ( 8 | (1UL << (BITS_PER_LONG-1)))
#define EFI_OUT_OF_RESOURCES ( 9 | (1UL << (BITS_PER_LONG-1)))
#define EFI_NOT_FOUND (14 | (1UL << (BITS_PER_LONG-1)))
#define EFI_SECURITY_VIOLATION (26 | (1UL << (BITS_PER_LONG-1)))
typedef unsigned long efi_status_t;
typedef u8 efi_bool_t;
@ -582,8 +587,6 @@ extern u64 efi_mem_attribute (unsigned long phys_addr, unsigned long size);
extern int __init efi_uart_console_only (void);
extern void efi_initialize_iomem_resources(struct resource *code_resource,
struct resource *data_resource, struct resource *bss_resource);
extern unsigned long efi_get_time(void);
extern int efi_set_rtc_mmss(unsigned long nowtime);
extern void efi_reserve_boot_services(void);
extern struct efi_memory_map memmap;
@ -729,6 +732,7 @@ struct efivars {
spinlock_t lock;
struct list_head list;
struct kset *kset;
struct kobject *kobject;
struct bin_attribute *new_var, *del_var;
const struct efivar_operations *ops;
struct efivar_entry *walk_entry;

View File

@ -27,6 +27,7 @@
#define ISOFS_SUPER_MAGIC 0x9660
#define JFFS2_SUPER_MAGIC 0x72b6
#define PSTOREFS_MAGIC 0x6165676C
#define EFIVARFS_MAGIC 0xde5e81e4
#define MINIX_SUPER_MAGIC 0x137F /* minix v1 fs, 14 char names */
#define MINIX_SUPER_MAGIC2 0x138F /* minix v1 fs, 30 char names */

View File

@ -463,6 +463,10 @@ static void __init mm_init(void)
percpu_init_late();
pgtable_cache_init();
vmalloc_init();
#ifdef CONFIG_X86
if (efi_enabled)
efi_enter_virtual_mode();
#endif
}
asmlinkage void __init start_kernel(void)
@ -603,10 +607,6 @@ asmlinkage void __init start_kernel(void)
calibrate_delay();
pidmap_init();
anon_vma_init();
#ifdef CONFIG_X86
if (efi_enabled)
efi_enter_virtual_mode();
#endif
thread_info_cache_init();
cred_init();
fork_init(totalram_pages);