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authorJosh Triplett <josh@joshtriplett.org>2012-09-28 17:55:44 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2012-09-29 12:21:01 -0700
commit785107923a83d8456bbd8564e288a24d84109a46 (patch)
treecda886bdf9d5f33a524b740e7807d17e079cb6b7
parent984ff8a4d2251fbd09b1e8515133bdfe9ef4bcd6 (diff)
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: 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>
-rw-r--r--arch/x86/platform/efi/efi.c31
-rw-r--r--include/linux/efi.h5
-rw-r--r--init/main.c3
3 files changed, 26 insertions, 13 deletions
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index f55a4ce6dc49..b3dbbdbd2a42 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -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) {
@@ -878,13 +893,6 @@ void __init efi_enter_virtual_mode(void)
}
/*
- * 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);
}
diff --git a/include/linux/efi.h b/include/linux/efi.h
index ec45ccd8708a..5782114f4838 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -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);
diff --git a/init/main.c b/init/main.c
index b28673087ac0..d61ec542205c 100644
--- a/init/main.c
+++ b/init/main.c
@@ -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 */