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* Fixes and cleanups for SMBIOS 3.0 DMI code - Ivan Khoronzhuk

Browse Source 
* A new efi=debug command line option that enables debug output in the
    EFI boot stub and results in less verbose EFI memory map output by
    default - Borislav Petkov
 
  * Disable interrupts around EFI calls and use a more standard page
    table saving and restoring idiom when making EFI calls - Ingo Molnar
 
  * Reduce the number of memory allocations performed when allocating the
    FDT in EFI boot stub by retrieving size from the FDT header in the
    EFI config table - Ard Biesheuvel
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Merge tag 'efi-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into core/efi

Pull EFI updates from Matt Fleming:

 - Fixes and cleanups for SMBIOS 3.0 DMI code. (Ivan Khoronzhuk)

 - A new efi=debug command line option that enables debug output in the
   EFI boot stub and results in less verbose EFI memory map output by
   default. (Borislav Petkov)

 - Disable interrupts around EFI calls and use a more standard page
   table saving and restoring idiom when making EFI calls. (Ingo Molnar)

 - Reduce the number of memory allocations performed when allocating the
   FDT in EFI boot stub by retrieving size from the FDT header in the
   EFI config table. (Ard Biesheuvel)

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-04-01 15:10:25 +02:00
commit 84a87c628a
10 changed files with 79 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/kernel-parameters.txt
View File

@ -1036,7 +1036,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Format: {"off" | "on" | "skip[mbr]"}
efi= [EFI]
Format: { "old_map", "nochunk", "noruntime" }
Format: { "old_map", "nochunk", "noruntime", "debug" }
old_map [X86-64]: switch to the old ioremap-based EFI
runtime services mapping. 32-bit still uses this one by
default.
@ -1044,6 +1044,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
boot stub, as chunking can cause problems with some
firmware implementations.
noruntime : disable EFI runtime services support
debug: enable misc debug output
efi_no_storage_paranoia [EFI; X86]
Using this parameter you can use more than 50% of

6
arch/x86/include/asm/efi.h
View File

@ -2,6 +2,8 @@
#define _ASM_X86_EFI_H
#include <asm/i387.h>
#include <asm/pgtable.h>
/*
* We map the EFI regions needed for runtime services non-contiguously,
* with preserved alignment on virtual addresses starting from -4G down
@ -89,8 +91,8 @@ extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
extern struct efi_scratch efi_scratch;
extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
extern int __init efi_memblock_x86_reserve_range(void);
extern void __init efi_call_phys_prolog(void);
extern void __init efi_call_phys_epilog(void);
extern pgd_t * __init efi_call_phys_prolog(void);
extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
extern void __init efi_unmap_memmap(void);
extern void __init efi_memory_uc(u64 addr, unsigned long size);
extern void __init efi_map_region(efi_memory_desc_t *md);

17
arch/x86/platform/efi/efi.c
View File

@ -85,12 +85,20 @@ static efi_status_t __init phys_efi_set_virtual_address_map(
efi_memory_desc_t *virtual_map)
{
efi_status_t status;
unsigned long flags;
pgd_t *save_pgd;
efi_call_phys_prolog();
save_pgd = efi_call_phys_prolog();
/* Disable interrupts around EFI calls: */
local_irq_save(flags);
status = efi_call_phys(efi_phys.set_virtual_address_map,
memory_map_size, descriptor_size,
descriptor_version, virtual_map);
efi_call_phys_epilog();
local_irq_restore(flags);
efi_call_phys_epilog(save_pgd);
return status;
}
@ -491,7 +499,8 @@ void __init efi_init(void)
if (efi_memmap_init())
return;
print_efi_memmap();
if (efi_enabled(EFI_DBG))
print_efi_memmap();
}
void __init efi_late_init(void)
@ -939,6 +948,8 @@ static int __init arch_parse_efi_cmdline(char *str)
{
if (parse_option_str(str, "old_map"))
set_bit(EFI_OLD_MEMMAP, &efi.flags);
if (parse_option_str(str, "debug"))
set_bit(EFI_DBG, &efi.flags);
return 0;
}

22
arch/x86/platform/efi/efi_32.c
View File

@ -33,11 +33,10 @@
/*
* To make EFI call EFI runtime service in physical addressing mode we need
* prolog/epilog before/after the invocation to disable interrupt, to
* claim EFI runtime service handler exclusively and to duplicate a memory in
* low memory space say 0 - 3G.
* prolog/epilog before/after the invocation to claim the EFI runtime service
* handler exclusively and to duplicate a memory mapping in low memory space,
* say 0 - 3G.
*/
static unsigned long efi_rt_eflags;
void efi_sync_low_kernel_mappings(void) {}
void __init efi_dump_pagetable(void) {}
@ -57,21 +56,24 @@ void __init efi_map_region(efi_memory_desc_t *md)
void __init efi_map_region_fixed(efi_memory_desc_t *md) {}
void __init parse_efi_setup(u64 phys_addr, u32 data_len) {}
void __init efi_call_phys_prolog(void)
pgd_t * __init efi_call_phys_prolog(void)
{
struct desc_ptr gdt_descr;
pgd_t *save_pgd;
local_irq_save(efi_rt_eflags);
/* Current pgd is swapper_pg_dir, we'll restore it later: */
save_pgd = swapper_pg_dir;
load_cr3(initial_page_table);
__flush_tlb_all();
gdt_descr.address = __pa(get_cpu_gdt_table(0));
gdt_descr.size = GDT_SIZE - 1;
load_gdt(&gdt_descr);
return save_pgd;
}
void __init efi_call_phys_epilog(void)
void __init efi_call_phys_epilog(pgd_t *save_pgd)
{
struct desc_ptr gdt_descr;
@ -79,10 +81,8 @@ void __init efi_call_phys_epilog(void)
gdt_descr.size = GDT_SIZE - 1;
load_gdt(&gdt_descr);
load_cr3(swapper_pg_dir);
load_cr3(save_pgd);
__flush_tlb_all();
local_irq_restore(efi_rt_eflags);
}
void __init efi_runtime_mkexec(void)

29
arch/x86/platform/efi/efi_64.c
View File

@ -41,9 +41,6 @@
#include <asm/realmode.h>
#include <asm/time.h>
static pgd_t *save_pgd __initdata;
static unsigned long efi_flags __initdata;
/*
* We allocate runtime services regions bottom-up, starting from -4G, i.e.
* 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G.
@ -78,17 +75,18 @@ static void __init early_code_mapping_set_exec(int executable)
}
}
void __init efi_call_phys_prolog(void)
pgd_t * __init efi_call_phys_prolog(void)
{
unsigned long vaddress;
pgd_t *save_pgd;
int pgd;
int n_pgds;
if (!efi_enabled(EFI_OLD_MEMMAP))
return;
return NULL;
early_code_mapping_set_exec(1);
local_irq_save(efi_flags);
n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL);
@ -99,24 +97,29 @@ void __init efi_call_phys_prolog(void)
set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress));
}
__flush_tlb_all();
return save_pgd;
}
void __init efi_call_phys_epilog(void)
void __init efi_call_phys_epilog(pgd_t *save_pgd)
{
/*
* After the lock is released, the original page table is restored.
*/
int pgd;
int n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);
int pgd_idx;
int nr_pgds;
if (!efi_enabled(EFI_OLD_MEMMAP))
if (!save_pgd)
return;
for (pgd = 0; pgd < n_pgds; pgd++)
set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), save_pgd[pgd]);
nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);
for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++)
set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]);
kfree(save_pgd);
__flush_tlb_all();
local_irq_restore(efi_flags);
early_code_mapping_set_exec(0);
}

37
drivers/firmware/dmi_scan.c
View File

@ -17,7 +17,9 @@
*/
static const char dmi_empty_string[] = " ";
static u16 __initdata dmi_ver;
static u32 dmi_ver __initdata;
static u32 dmi_len;
static u16 dmi_num;
/*
* Catch too early calls to dmi_check_system():
*/
@ -78,7 +80,7 @@ static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
* We have to be cautious here. We have seen BIOSes with DMI pointers
* pointing to completely the wrong place for example
*/
static void dmi_table(u8 *buf, u32 len, int num,
static void dmi_table(u8 *buf,
void (*decode)(const struct dmi_header *, void *),
void *private_data)
{
@ -89,7 +91,8 @@ static void dmi_table(u8 *buf, u32 len, int num,
* Stop when we see all the items the table claimed to have
* OR we run off the end of the table (also happens)
*/
while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
while ((i < dmi_num) && (data - buf + sizeof(struct dmi_header))
<= dmi_len) {
const struct dmi_header *dm = (const struct dmi_header *)data;
/*
@ -98,9 +101,9 @@ static void dmi_table(u8 *buf, u32 len, int num,
* table in dmi_decode or dmi_string
*/
data += dm->length;
while ((data - buf < len - 1) && (data[0] || data[1]))
while ((data - buf < dmi_len - 1) && (data[0] || data[1]))
data++;
if (data - buf < len - 1)
if (data - buf < dmi_len - 1)
decode(dm, private_data);
/*
@ -115,8 +118,6 @@ static void dmi_table(u8 *buf, u32 len, int num,
}
static phys_addr_t dmi_base;
static u32 dmi_len;
static u16 dmi_num;
static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
void *))
@ -127,7 +128,7 @@ static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
if (buf == NULL)
return -1;
dmi_table(buf, dmi_len, dmi_num, decode, NULL);
dmi_table(buf, decode, NULL);
add_device_randomness(buf, dmi_len);
@ -198,7 +199,7 @@ static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
* the UUID are supposed to be little-endian encoded. The specification
* says that this is the defacto standard.
*/
if (dmi_ver >= 0x0206)
if (dmi_ver >= 0x020600)
sprintf(s, "%pUL", d);
else
sprintf(s, "%pUB", d);
@ -470,7 +471,7 @@ static void __init dmi_format_ids(char *buf, size_t len)
*/
static int __init dmi_present(const u8 *buf)
{
int smbios_ver;
u32 smbios_ver;
if (memcmp(buf, "_SM_", 4) == 0 &&
buf[5] < 32 && dmi_checksum(buf, buf[5])) {
@ -503,14 +504,16 @@ static int __init dmi_present(const u8 *buf)
if (dmi_walk_early(dmi_decode) == 0) {
if (smbios_ver) {
dmi_ver = smbios_ver;
pr_info("SMBIOS %d.%d present.\n",
dmi_ver >> 8, dmi_ver & 0xFF);
pr_info("SMBIOS %d.%d%s present.\n",
dmi_ver >> 8, dmi_ver & 0xFF,
(dmi_ver < 0x0300) ? "" : ".x");
} else {
dmi_ver = (buf[14] & 0xF0) << 4 |
(buf[14] & 0x0F);
pr_info("Legacy DMI %d.%d present.\n",
dmi_ver >> 8, dmi_ver & 0xFF);
}
dmi_ver <<= 8;
dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
printk(KERN_DEBUG "DMI: %s\n", dmi_ids_string);
return 0;
@ -528,7 +531,8 @@ static int __init dmi_smbios3_present(const u8 *buf)
{
if (memcmp(buf, "_SM3_", 5) == 0 &&
buf[6] < 32 && dmi_checksum(buf, buf[6])) {
dmi_ver = get_unaligned_be16(buf + 7);
dmi_ver = get_unaligned_be32(buf + 6);
dmi_ver &= 0xFFFFFF;
dmi_len = get_unaligned_le32(buf + 12);
dmi_base = get_unaligned_le64(buf + 16);
@ -545,8 +549,9 @@ static int __init dmi_smbios3_present(const u8 *buf)
dmi_num = dmi_len / 4;
if (dmi_walk_early(dmi_decode) == 0) {
pr_info("SMBIOS %d.%d present.\n",
dmi_ver >> 8, dmi_ver & 0xFF);
pr_info("SMBIOS %d.%d.%d present.\n",
dmi_ver >> 16, (dmi_ver >> 8) & 0xFF,
dmi_ver & 0xFF);
dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
pr_debug("DMI: %s\n", dmi_ids_string);
return 0;
@ -901,7 +906,7 @@ int dmi_walk(void (*decode)(const struct dmi_header *, void *),
if (buf == NULL)
return -1;
dmi_table(buf, dmi_len, dmi_num, decode, private_data);
dmi_table(buf, decode, private_data);
dmi_unmap(buf);
return 0;

7
drivers/firmware/efi/libstub/arm-stub.c
View File

@ -175,7 +175,7 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
unsigned long initrd_addr;
u64 initrd_size = 0;
unsigned long fdt_addr = 0; /* Original DTB */
u64 fdt_size = 0; /* We don't get size from configuration table */
unsigned long fdt_size = 0;
char *cmdline_ptr = NULL;
int cmdline_size = 0;
unsigned long new_fdt_addr;
@ -239,8 +239,7 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
} else {
status = handle_cmdline_files(sys_table, image, cmdline_ptr,
"dtb=",
~0UL, (unsigned long *)&fdt_addr,
(unsigned long *)&fdt_size);
~0UL, &fdt_addr, &fdt_size);
if (status != EFI_SUCCESS) {
pr_efi_err(sys_table, "Failed to load device tree!\n");
@ -252,7 +251,7 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
pr_efi(sys_table, "Using DTB from command line\n");
} else {
/* Look for a device tree configuration table entry. */
fdt_addr = (uintptr_t)get_fdt(sys_table);
fdt_addr = (uintptr_t)get_fdt(sys_table, &fdt_size);
if (fdt_addr)
pr_efi(sys_table, "Using DTB from configuration table\n");
}

2
drivers/firmware/efi/libstub/efistub.h
View File

@ -41,7 +41,7 @@ efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
unsigned long fdt_addr,
unsigned long fdt_size);
void *get_fdt(efi_system_table_t *sys_table);
void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size);
void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
unsigned long desc_size, efi_memory_desc_t *runtime_map,

7
drivers/firmware/efi/libstub/fdt.c
View File

@ -323,7 +323,7 @@ fail:
return EFI_LOAD_ERROR;
}
void *get_fdt(efi_system_table_t *sys_table)
void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size)
{
efi_guid_t fdt_guid = DEVICE_TREE_GUID;
efi_config_table_t *tables;
@ -336,6 +336,11 @@ void *get_fdt(efi_system_table_t *sys_table)
for (i = 0; i < sys_table->nr_tables; i++)
if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
fdt = (void *) tables[i].table;
if (fdt_check_header(fdt) != 0) {
pr_efi_err(sys_table, "Invalid header detected on UEFI supplied FDT, ignoring ...\n");
return NULL;
}
*fdt_size = fdt_totalsize(fdt);
break;
}

1
include/linux/efi.h
View File

@ -942,6 +942,7 @@ extern int __init efi_setup_pcdp_console(char *);
#define EFI_64BIT 5 /* Is the firmware 64-bit? */
#define EFI_PARAVIRT 6 /* Access is via a paravirt interface */
#define EFI_ARCH_1 7 /* First arch-specific bit */
#define EFI_DBG 8 /* Print additional debug info at runtime */
#ifdef CONFIG_EFI
/*