Commit 78510792 authored by Josh Triplett's avatar Josh Triplett Committed by H. Peter Anvin
Browse files

efi: Defer freeing boot services memory until after ACPI init 



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: default avatarJosh Triplett <josh@joshtriplett.org>
Link: http://lkml.kernel.org/r/baaa6d44bdc4eb0c58e5d1b4ccd2c729f854ac55.1348876882.git.josh@joshtriplett.org


Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 984ff8a4

arch/x86/platform/efi/efi.c

+18 −13
Original line number Diff line number Diff line
@@ -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);

}

include/linux/efi.h

+5 −0
Original line number Diff line number Diff line
@@ -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);

init/main.c

+3 −0
Original line number Diff line number Diff line
@@ -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 */

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