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Commit 31ce8cc6 authored by Matt Fleming's avatar Matt Fleming
Browse files

efi/runtime-map: Use efi.memmap directly instead of a copy 



Now that efi.memmap is available all of the time there's no need to
allocate and build a separate copy of the EFI memory map.

Furthermore, efi.memmap contains boot services regions but only those
regions that have been reserved via efi_mem_reserve(). Using
efi.memmap allows us to pass boot services across kexec reboot so that
the ESRT and BGRT drivers will now work.

Tested-by: Dave Young <dyoung@redhat.com> [kexec/kdump]
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> [arm]
Acked-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Peter Jones <pjones@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarMatt Fleming <matt@codeblueprint.co.uk>
parent 816e7612

arch/x86/platform/efi/efi.c

+0 −40
Original line number Diff line number Diff line
@@ -592,42 +592,6 @@ static void __init get_systab_virt_addr(efi_memory_desc_t *md) 
	}

}



static void __init save_runtime_map(void)

{

#ifdef CONFIG_KEXEC_CORE

	unsigned long desc_size;

	efi_memory_desc_t *md;

	void *tmp, *q = NULL;

	int count = 0;



	if (efi_enabled(EFI_OLD_MEMMAP))

		return;



	desc_size = efi.memmap.desc_size;



	for_each_efi_memory_desc(md) {

		if (!(md->attribute & EFI_MEMORY_RUNTIME) ||

		    (md->type == EFI_BOOT_SERVICES_CODE) ||

		    (md->type == EFI_BOOT_SERVICES_DATA))

			continue;

		tmp = krealloc(q, (count + 1) * desc_size, GFP_KERNEL);

		if (!tmp)

			goto out;

		q = tmp;



		memcpy(q + count * desc_size, md, desc_size);

		count++;

	}



	efi_runtime_map_setup(q, count, desc_size);

	return;



out:

	kfree(q);

	pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n");

#endif

}



static void *realloc_pages(void *old_memmap, int old_shift)

{

	void *ret;
@@ -840,8 +804,6 @@ static void __init kexec_enter_virtual_mode(void) 
		return;

	}



	save_runtime_map();



	BUG_ON(!efi.systab);



	num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE);
@@ -934,8 +896,6 @@ static void __init __efi_enter_virtual_mode(void) 
		return;

	}



	save_runtime_map();



	BUG_ON(!efi.systab);



	if (efi_setup_page_tables(pa, 1 << pg_shift)) {

drivers/firmware/efi/runtime-map.c

+13 −22
Original line number Diff line number Diff line
@@ -14,10 +14,6 @@ 


#include <asm/setup.h>



static void *efi_runtime_map;

static int nr_efi_runtime_map;

static u32 efi_memdesc_size;



struct efi_runtime_map_entry {

	efi_memory_desc_t md;

	struct kobject kobj;   /* kobject for each entry */
@@ -106,7 +102,8 @@ static struct kobj_type __refdata map_ktype = { 
static struct kset *map_kset;



static struct efi_runtime_map_entry *

add_sysfs_runtime_map_entry(struct kobject *kobj, int nr)

add_sysfs_runtime_map_entry(struct kobject *kobj, int nr,

			    efi_memory_desc_t *md)

{

	int ret;

	struct efi_runtime_map_entry *entry;
@@ -124,8 +121,7 @@ add_sysfs_runtime_map_entry(struct kobject *kobj, int nr) 
		return ERR_PTR(-ENOMEM);

	}



	memcpy(&entry->md, efi_runtime_map + nr * efi_memdesc_size,

	       sizeof(efi_memory_desc_t));

	memcpy(&entry->md, md, sizeof(efi_memory_desc_t));



	kobject_init(&entry->kobj, &map_ktype);

	entry->kobj.kset = map_kset;
@@ -142,12 +138,12 @@ add_sysfs_runtime_map_entry(struct kobject *kobj, int nr) 


int efi_get_runtime_map_size(void)

{

	return nr_efi_runtime_map * efi_memdesc_size;

	return efi.memmap.nr_map * efi.memmap.desc_size;

}



int efi_get_runtime_map_desc_size(void)

{

	return efi_memdesc_size;

	return efi.memmap.desc_size;

}



int efi_runtime_map_copy(void *buf, size_t bufsz)
@@ -157,38 +153,33 @@ int efi_runtime_map_copy(void *buf, size_t bufsz) 
	if (sz > bufsz)

		sz = bufsz;



	memcpy(buf, efi_runtime_map, sz);

	memcpy(buf, efi.memmap.map, sz);

	return 0;

}



void efi_runtime_map_setup(void *map, int nr_entries, u32 desc_size)

{

	efi_runtime_map = map;

	nr_efi_runtime_map = nr_entries;

	efi_memdesc_size = desc_size;

}



int __init efi_runtime_map_init(struct kobject *efi_kobj)

{

	int i, j, ret = 0;

	struct efi_runtime_map_entry *entry;

	efi_memory_desc_t *md;



	if (!efi_runtime_map)

	if (!efi_enabled(EFI_MEMMAP))

		return 0;



	map_entries = kzalloc(nr_efi_runtime_map * sizeof(entry), GFP_KERNEL);

	map_entries = kzalloc(efi.memmap.nr_map * sizeof(entry), GFP_KERNEL);

	if (!map_entries) {

		ret = -ENOMEM;

		goto out;

	}



	for (i = 0; i < nr_efi_runtime_map; i++) {

		entry = add_sysfs_runtime_map_entry(efi_kobj, i);

	i = 0;

	for_each_efi_memory_desc(md) {

		entry = add_sysfs_runtime_map_entry(efi_kobj, i, md);

		if (IS_ERR(entry)) {

			ret = PTR_ERR(entry);

			goto out_add_entry;

		}

		*(map_entries + i) = entry;

		*(map_entries + i++) = entry;

	}



	return 0;

include/linux/efi.h

+0 −4
Original line number Diff line number Diff line
@@ -1357,7 +1357,6 @@ extern int efi_capsule_update(efi_capsule_header_t *capsule, 


#ifdef CONFIG_EFI_RUNTIME_MAP

int efi_runtime_map_init(struct kobject *);

void efi_runtime_map_setup(void *, int, u32);

int efi_get_runtime_map_size(void);

int efi_get_runtime_map_desc_size(void);

int efi_runtime_map_copy(void *buf, size_t bufsz);
@@ -1367,9 +1366,6 @@ static inline int efi_runtime_map_init(struct kobject *kobj) 
	return 0;

}



static inline void

efi_runtime_map_setup(void *map, int nr_entries, u32 desc_size) {}



static inline int efi_get_runtime_map_size(void)

{

	return 0;