![Matt Fleming](/assets/img/avatar_default.png)
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: Ard 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: Matt Fleming <matt@codeblueprint.co.uk>
194 lines
4.3 KiB
C
194 lines
4.3 KiB
C
/*
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* linux/drivers/efi/runtime-map.c
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* Copyright (C) 2013 Red Hat, Inc., Dave Young <dyoung@redhat.com>
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/efi.h>
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#include <linux/slab.h>
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#include <asm/setup.h>
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struct efi_runtime_map_entry {
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efi_memory_desc_t md;
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struct kobject kobj; /* kobject for each entry */
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};
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static struct efi_runtime_map_entry **map_entries;
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struct map_attribute {
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struct attribute attr;
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ssize_t (*show)(struct efi_runtime_map_entry *entry, char *buf);
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};
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static inline struct map_attribute *to_map_attr(struct attribute *attr)
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{
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return container_of(attr, struct map_attribute, attr);
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}
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static ssize_t type_show(struct efi_runtime_map_entry *entry, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "0x%x\n", entry->md.type);
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}
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#define EFI_RUNTIME_FIELD(var) entry->md.var
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#define EFI_RUNTIME_U64_ATTR_SHOW(name) \
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static ssize_t name##_show(struct efi_runtime_map_entry *entry, char *buf) \
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{ \
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return snprintf(buf, PAGE_SIZE, "0x%llx\n", EFI_RUNTIME_FIELD(name)); \
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}
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EFI_RUNTIME_U64_ATTR_SHOW(phys_addr);
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EFI_RUNTIME_U64_ATTR_SHOW(virt_addr);
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EFI_RUNTIME_U64_ATTR_SHOW(num_pages);
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EFI_RUNTIME_U64_ATTR_SHOW(attribute);
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static inline struct efi_runtime_map_entry *to_map_entry(struct kobject *kobj)
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{
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return container_of(kobj, struct efi_runtime_map_entry, kobj);
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}
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static ssize_t map_attr_show(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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struct efi_runtime_map_entry *entry = to_map_entry(kobj);
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struct map_attribute *map_attr = to_map_attr(attr);
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return map_attr->show(entry, buf);
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}
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static struct map_attribute map_type_attr = __ATTR_RO(type);
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static struct map_attribute map_phys_addr_attr = __ATTR_RO(phys_addr);
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static struct map_attribute map_virt_addr_attr = __ATTR_RO(virt_addr);
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static struct map_attribute map_num_pages_attr = __ATTR_RO(num_pages);
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static struct map_attribute map_attribute_attr = __ATTR_RO(attribute);
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/*
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* These are default attributes that are added for every memmap entry.
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*/
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static struct attribute *def_attrs[] = {
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&map_type_attr.attr,
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&map_phys_addr_attr.attr,
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&map_virt_addr_attr.attr,
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&map_num_pages_attr.attr,
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&map_attribute_attr.attr,
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NULL
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};
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static const struct sysfs_ops map_attr_ops = {
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.show = map_attr_show,
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};
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static void map_release(struct kobject *kobj)
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{
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struct efi_runtime_map_entry *entry;
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entry = to_map_entry(kobj);
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kfree(entry);
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}
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static struct kobj_type __refdata map_ktype = {
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.sysfs_ops = &map_attr_ops,
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.default_attrs = def_attrs,
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.release = map_release,
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};
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static struct kset *map_kset;
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static struct efi_runtime_map_entry *
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add_sysfs_runtime_map_entry(struct kobject *kobj, int nr,
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efi_memory_desc_t *md)
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{
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int ret;
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struct efi_runtime_map_entry *entry;
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if (!map_kset) {
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map_kset = kset_create_and_add("runtime-map", NULL, kobj);
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if (!map_kset)
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return ERR_PTR(-ENOMEM);
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}
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entry = kzalloc(sizeof(*entry), GFP_KERNEL);
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if (!entry) {
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kset_unregister(map_kset);
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map_kset = NULL;
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return ERR_PTR(-ENOMEM);
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}
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memcpy(&entry->md, md, sizeof(efi_memory_desc_t));
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kobject_init(&entry->kobj, &map_ktype);
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entry->kobj.kset = map_kset;
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ret = kobject_add(&entry->kobj, NULL, "%d", nr);
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if (ret) {
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kobject_put(&entry->kobj);
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kset_unregister(map_kset);
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map_kset = NULL;
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return ERR_PTR(ret);
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}
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return entry;
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}
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int efi_get_runtime_map_size(void)
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{
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return efi.memmap.nr_map * efi.memmap.desc_size;
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}
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int efi_get_runtime_map_desc_size(void)
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{
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return efi.memmap.desc_size;
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}
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int efi_runtime_map_copy(void *buf, size_t bufsz)
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{
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size_t sz = efi_get_runtime_map_size();
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if (sz > bufsz)
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sz = bufsz;
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memcpy(buf, efi.memmap.map, sz);
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return 0;
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}
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int __init efi_runtime_map_init(struct kobject *efi_kobj)
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{
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int i, j, ret = 0;
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struct efi_runtime_map_entry *entry;
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efi_memory_desc_t *md;
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if (!efi_enabled(EFI_MEMMAP))
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return 0;
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map_entries = kzalloc(efi.memmap.nr_map * sizeof(entry), GFP_KERNEL);
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if (!map_entries) {
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ret = -ENOMEM;
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goto out;
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}
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i = 0;
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for_each_efi_memory_desc(md) {
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entry = add_sysfs_runtime_map_entry(efi_kobj, i, md);
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if (IS_ERR(entry)) {
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ret = PTR_ERR(entry);
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goto out_add_entry;
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}
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*(map_entries + i++) = entry;
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}
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return 0;
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out_add_entry:
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for (j = i - 1; j >= 0; j--) {
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entry = *(map_entries + j);
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kobject_put(&entry->kobj);
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}
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out:
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return ret;
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}
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