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efi: Defer freeing boot services memory until after ACPI init

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Some new ACPI 5.0 tables reference resources stored in boot services
memory, so keep that memory around until we have ACPI and can extract
data from it.

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Link: http://lkml.kernel.org/r/baaa6d44bdc4eb0c58e5d1b4ccd2c729f854ac55.1348876882.git.josh@joshtriplett.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Josh Triplett 2012-09-28 17:55:44 -07:00 committed by H. Peter Anvin
parent 984ff8a4d2
commit 785107923a
3 changed files with 26 additions and 13 deletions
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31
arch/x86/platform/efi/efi.c
View file

@ -419,10 +419,21 @@ void __init efi_reserve_boot_services(void)
}
}
static void __init efi_free_boot_services(void)
static void __init efi_unmap_memmap(void)
{
if (memmap.map) {
early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
memmap.map = NULL;
}
}
void __init efi_free_boot_services(void)
{
void *p;
if (!efi_native)
return;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
efi_memory_desc_t *md = p;
unsigned long long start = md->phys_addr;
@ -438,6 +449,8 @@ static void __init efi_free_boot_services(void)
free_bootmem_late(start, size);
}
efi_unmap_memmap();
}
static int __init efi_systab_init(void *phys)
@ -787,8 +800,10 @@ void __init efi_enter_virtual_mode(void)
* non-native EFI
*/
if (!efi_native)
goto out;
if (!efi_native) {
efi_unmap_memmap();
return;
}
/* Merge contiguous regions of the same type and attribute */
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
@ -877,13 +892,6 @@ void __init efi_enter_virtual_mode(void)
panic("EFI call to SetVirtualAddressMap() failed!");
}
/*
* Thankfully, it does seem that no runtime services other than
* SetVirtualAddressMap() will touch boot services code, so we can
* get rid of it all at this point
*/
efi_free_boot_services();
/*
* Now that EFI is in virtual mode, update the function
* pointers in the runtime service table to the new virtual addresses.
@ -907,9 +915,6 @@ void __init efi_enter_virtual_mode(void)
if (__supported_pte_mask & _PAGE_NX)
runtime_code_page_mkexec();
out:
early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
memmap.map = NULL;
kfree(new_memmap);
}

5
include/linux/efi.h
View file

@ -496,6 +496,11 @@ extern void efi_map_pal_code (void);
extern void efi_memmap_walk (efi_freemem_callback_t callback, void *arg);
extern void efi_gettimeofday (struct timespec *ts);
extern void efi_enter_virtual_mode (void); /* switch EFI to virtual mode, if possible */
#ifdef CONFIG_X86
extern void efi_free_boot_services(void);
#else
static inline void efi_free_boot_services(void) {}
#endif
extern u64 efi_get_iobase (void);
extern u32 efi_mem_type (unsigned long phys_addr);
extern u64 efi_mem_attributes (unsigned long phys_addr);

3
init/main.c
View file

@ -631,6 +631,9 @@ asmlinkage void __init start_kernel(void)
acpi_early_init(); /* before LAPIC and SMP init */
sfi_init_late();
if (efi_enabled)
efi_free_boot_services();
ftrace_init();
/* Do the rest non-__init'ed, we're now alive */