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-rw-r--r--drivers/firmware/efi/Kconfig17
-rw-r--r--drivers/firmware/efi/Makefile3
-rw-r--r--drivers/firmware/efi/arm-init.c50
-rw-r--r--drivers/firmware/efi/arm-runtime.c26
-rw-r--r--drivers/firmware/efi/efi-pstore.c36
-rw-r--r--drivers/firmware/efi/efi.c67
-rw-r--r--drivers/firmware/efi/efivars.c22
-rw-r--r--drivers/firmware/efi/esrt.c23
-rw-r--r--drivers/firmware/efi/fake_mem.c125
-rw-r--r--drivers/firmware/efi/memmap.c292
-rw-r--r--drivers/firmware/efi/runtime-map.c35
-rw-r--r--drivers/firmware/efi/runtime-wrappers.c81
-rw-r--r--drivers/firmware/efi/test/Makefile1
-rw-r--r--drivers/firmware/efi/test/efi_test.c749
-rw-r--r--drivers/firmware/efi/test/efi_test.h110
-rw-r--r--drivers/firmware/efi/vars.c142
16 files changed, 1471 insertions, 308 deletions
diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
index 6394152f648f..c981be17d3c0 100644
--- a/drivers/firmware/efi/Kconfig
+++ b/drivers/firmware/efi/Kconfig
@@ -112,6 +112,23 @@ config EFI_CAPSULE_LOADER
Most users should say N.
+config EFI_TEST
+ tristate "EFI Runtime Service Tests Support"
+ depends on EFI
+ default n
+ help
+ This driver uses the efi.<service> function pointers directly instead
+ of going through the efivar API, because it is not trying to test the
+ kernel subsystem, just for testing the UEFI runtime service
+ interfaces which are provided by the firmware. This driver is used
+ by the Firmware Test Suite (FWTS) for testing the UEFI runtime
+ interfaces readiness of the firmware.
+ Details for FWTS are available from:
+ <https://wiki.ubuntu.com/FirmwareTestSuite>
+
+ Say Y here to enable the runtime services support via /dev/efi_test.
+ If unsure, say N.
+
endmenu
config UEFI_CPER
diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile
index a219640f881f..c8a439f6d715 100644
--- a/drivers/firmware/efi/Makefile
+++ b/drivers/firmware/efi/Makefile
@@ -10,7 +10,7 @@
KASAN_SANITIZE_runtime-wrappers.o := n
obj-$(CONFIG_EFI) += efi.o vars.o reboot.o memattr.o
-obj-$(CONFIG_EFI) += capsule.o
+obj-$(CONFIG_EFI) += capsule.o memmap.o
obj-$(CONFIG_EFI_VARS) += efivars.o
obj-$(CONFIG_EFI_ESRT) += esrt.o
obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o
@@ -20,6 +20,7 @@ obj-$(CONFIG_EFI_RUNTIME_WRAPPERS) += runtime-wrappers.o
obj-$(CONFIG_EFI_STUB) += libstub/
obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_mem.o
obj-$(CONFIG_EFI_BOOTLOADER_CONTROL) += efibc.o
+obj-$(CONFIG_EFI_TEST) += test/
arm-obj-$(CONFIG_EFI) := arm-init.o arm-runtime.o
obj-$(CONFIG_ARM) += $(arm-obj-y)
diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c
index c49d50e68aee..8efe13075c92 100644
--- a/drivers/firmware/efi/arm-init.c
+++ b/drivers/firmware/efi/arm-init.c
@@ -26,9 +26,9 @@
u64 efi_system_table;
-static int __init is_normal_ram(efi_memory_desc_t *md)
+static int __init is_memory(efi_memory_desc_t *md)
{
- if (md->attribute & EFI_MEMORY_WB)
+ if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
return 1;
return 0;
}
@@ -152,9 +152,9 @@ out:
}
/*
- * Return true for RAM regions we want to permanently reserve.
+ * Return true for regions that can be used as System RAM.
*/
-static __init int is_reserve_region(efi_memory_desc_t *md)
+static __init int is_usable_memory(efi_memory_desc_t *md)
{
switch (md->type) {
case EFI_LOADER_CODE:
@@ -163,18 +163,22 @@ static __init int is_reserve_region(efi_memory_desc_t *md)
case EFI_BOOT_SERVICES_DATA:
case EFI_CONVENTIONAL_MEMORY:
case EFI_PERSISTENT_MEMORY:
- return 0;
+ /*
+ * According to the spec, these regions are no longer reserved
+ * after calling ExitBootServices(). However, we can only use
+ * them as System RAM if they can be mapped writeback cacheable.
+ */
+ return (md->attribute & EFI_MEMORY_WB);
default:
break;
}
- return is_normal_ram(md);
+ return false;
}
static __init void reserve_regions(void)
{
efi_memory_desc_t *md;
u64 paddr, npages, size;
- int resv;
if (efi_enabled(EFI_DBG))
pr_info("Processing EFI memory map:\n");
@@ -191,32 +195,29 @@ static __init void reserve_regions(void)
paddr = md->phys_addr;
npages = md->num_pages;
- resv = is_reserve_region(md);
if (efi_enabled(EFI_DBG)) {
char buf[64];
- pr_info(" 0x%012llx-0x%012llx %s%s\n",
+ pr_info(" 0x%012llx-0x%012llx %s\n",
paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
- efi_md_typeattr_format(buf, sizeof(buf), md),
- resv ? "*" : "");
+ efi_md_typeattr_format(buf, sizeof(buf), md));
}
memrange_efi_to_native(&paddr, &npages);
size = npages << PAGE_SHIFT;
- if (is_normal_ram(md))
+ if (is_memory(md)) {
early_init_dt_add_memory_arch(paddr, size);
- if (resv)
- memblock_mark_nomap(paddr, size);
-
+ if (!is_usable_memory(md))
+ memblock_mark_nomap(paddr, size);
+ }
}
-
- set_bit(EFI_MEMMAP, &efi.flags);
}
void __init efi_init(void)
{
+ struct efi_memory_map_data data;
struct efi_fdt_params params;
/* Grab UEFI information placed in FDT by stub */
@@ -225,9 +226,12 @@ void __init efi_init(void)
efi_system_table = params.system_table;
- efi.memmap.phys_map = params.mmap;
- efi.memmap.map = early_memremap_ro(params.mmap, params.mmap_size);
- if (efi.memmap.map == NULL) {
+ data.desc_version = params.desc_ver;
+ data.desc_size = params.desc_size;
+ data.size = params.mmap_size;
+ data.phys_map = params.mmap;
+
+ if (efi_memmap_init_early(&data) < 0) {
/*
* If we are booting via UEFI, the UEFI memory map is the only
* description of memory we have, so there is little point in
@@ -235,9 +239,6 @@ void __init efi_init(void)
*/
panic("Unable to map EFI memory map.\n");
}
- efi.memmap.map_end = efi.memmap.map + params.mmap_size;
- efi.memmap.desc_size = params.desc_size;
- efi.memmap.desc_version = params.desc_ver;
WARN(efi.memmap.desc_version != 1,
"Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
@@ -248,7 +249,8 @@ void __init efi_init(void)
reserve_regions();
efi_memattr_init();
- early_memunmap(efi.memmap.map, params.mmap_size);
+ efi_esrt_init();
+ efi_memmap_unmap();
memblock_reserve(params.mmap & PAGE_MASK,
PAGE_ALIGN(params.mmap_size +
diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
index c394b81fe452..7c75a8d9091a 100644
--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c
@@ -39,6 +39,26 @@ static struct mm_struct efi_mm = {
.mmlist = LIST_HEAD_INIT(efi_mm.mmlist),
};
+#ifdef CONFIG_ARM64_PTDUMP
+#include <asm/ptdump.h>
+
+static struct ptdump_info efi_ptdump_info = {
+ .mm = &efi_mm,
+ .markers = (struct addr_marker[]){
+ { 0, "UEFI runtime start" },
+ { TASK_SIZE_64, "UEFI runtime end" }
+ },
+ .base_addr = 0,
+};
+
+static int __init ptdump_init(void)
+{
+ return ptdump_register(&efi_ptdump_info, "efi_page_tables");
+}
+device_initcall(ptdump_init);
+
+#endif
+
static bool __init efi_virtmap_init(void)
{
efi_memory_desc_t *md;
@@ -114,14 +134,12 @@ static int __init arm_enable_runtime_services(void)
pr_info("Remapping and enabling EFI services.\n");
- mapsize = efi.memmap.map_end - efi.memmap.map;
+ mapsize = efi.memmap.desc_size * efi.memmap.nr_map;
- efi.memmap.map = memremap(efi.memmap.phys_map, mapsize, MEMREMAP_WB);
- if (!efi.memmap.map) {
+ if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) {
pr_err("Failed to remap EFI memory map\n");
return -ENOMEM;
}
- efi.memmap.map_end = efi.memmap.map + mapsize;
if (!efi_virtmap_init()) {
pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n");
diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c
index 30a24d09ea6c..1c33d7469e4a 100644
--- a/drivers/firmware/efi/efi-pstore.c
+++ b/drivers/firmware/efi/efi-pstore.c
@@ -125,16 +125,19 @@ static void efi_pstore_scan_sysfs_enter(struct efivar_entry *pos,
* @entry: deleting entry
* @turn_off_scanning: Check if a scanning flag should be turned off
*/
-static inline void __efi_pstore_scan_sysfs_exit(struct efivar_entry *entry,
+static inline int __efi_pstore_scan_sysfs_exit(struct efivar_entry *entry,
bool turn_off_scanning)
{
if (entry->deleting) {
list_del(&entry->list);
efivar_entry_iter_end();
efivar_unregister(entry);
- efivar_entry_iter_begin();
+ if (efivar_entry_iter_begin())
+ return -EINTR;
} else if (turn_off_scanning)
entry->scanning = false;
+
+ return 0;
}
/**
@@ -144,13 +147,18 @@ static inline void __efi_pstore_scan_sysfs_exit(struct efivar_entry *entry,
* @head: list head
* @stop: a flag checking if scanning will stop
*/
-static void efi_pstore_scan_sysfs_exit(struct efivar_entry *pos,
+static int efi_pstore_scan_sysfs_exit(struct efivar_entry *pos,
struct efivar_entry *next,
struct list_head *head, bool stop)
{
- __efi_pstore_scan_sysfs_exit(pos, true);
+ int ret = __efi_pstore_scan_sysfs_exit(pos, true);
+
+ if (ret)
+ return ret;
+
if (stop)
- __efi_pstore_scan_sysfs_exit(next, &next->list != head);
+ ret = __efi_pstore_scan_sysfs_exit(next, &next->list != head);
+ return ret;
}
/**
@@ -172,13 +180,17 @@ static int efi_pstore_sysfs_entry_iter(void *data, struct efivar_entry **pos)
struct efivar_entry *entry, *n;
struct list_head *head = &efivar_sysfs_list;
int size = 0;
+ int ret;
if (!*pos) {
list_for_each_entry_safe(entry, n, head, list) {
efi_pstore_scan_sysfs_enter(entry, n, head);
size = efi_pstore_read_func(entry, data);
- efi_pstore_scan_sysfs_exit(entry, n, head, size < 0);
+ ret = efi_pstore_scan_sysfs_exit(entry, n, head,
+ size < 0);
+ if (ret)
+ return ret;
if (size)
break;
}
@@ -190,7 +202,9 @@ static int efi_pstore_sysfs_entry_iter(void *data, struct efivar_entry **pos)
efi_pstore_scan_sysfs_enter((*pos), n, head);
size = efi_pstore_read_func((*pos), data);
- efi_pstore_scan_sysfs_exit((*pos), n, head, size < 0);
+ ret = efi_pstore_scan_sysfs_exit((*pos), n, head, size < 0);
+ if (ret)
+ return ret;
if (size)
break;
}
@@ -232,7 +246,10 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
if (!*data.buf)
return -ENOMEM;
- efivar_entry_iter_begin();
+ if (efivar_entry_iter_begin()) {
+ kfree(*data.buf);
+ return -EINTR;
+ }
size = efi_pstore_sysfs_entry_iter(&data,
(struct efivar_entry **)&psi->data);
efivar_entry_iter_end();
@@ -347,7 +364,8 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
edata.time = time;
edata.name = efi_name;
- efivar_entry_iter_begin();
+ if (efivar_entry_iter_begin())
+ return -EINTR;
found = __efivar_entry_iter(efi_pstore_erase_func, &efivar_sysfs_list, &edata, &entry);
if (found && !entry->scanning) {
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 7dd2e2d37231..1ac199cd75e7 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/ucs2_string.h>
+#include <linux/memblock.h>
#include <asm/early_ioremap.h>
@@ -347,56 +348,31 @@ subsys_initcall(efisubsys_init);
/*
* Find the efi memory descriptor for a given physical address. Given a
- * physicall address, determine if it exists within an EFI Memory Map entry,
+ * physical address, determine if it exists within an EFI Memory Map entry,
* and if so, populate the supplied memory descriptor with the appropriate
* data.
*/
int __init efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
{
- struct efi_memory_map *map = &efi.memmap;
- phys_addr_t p, e;
+ efi_memory_desc_t *md;
if (!efi_enabled(EFI_MEMMAP)) {
pr_err_once("EFI_MEMMAP is not enabled.\n");
return -EINVAL;
}
- if (!map) {
- pr_err_once("efi.memmap is not set.\n");
- return -EINVAL;
- }
if (!out_md) {
pr_err_once("out_md is null.\n");
return -EINVAL;
}
- if (WARN_ON_ONCE(!map->phys_map))
- return -EINVAL;
- if (WARN_ON_ONCE(map->nr_map == 0) || WARN_ON_ONCE(map->desc_size == 0))
- return -EINVAL;
- e = map->phys_map + map->nr_map * map->desc_size;
- for (p = map->phys_map; p < e; p += map->desc_size) {
- efi_memory_desc_t *md;
+ for_each_efi_memory_desc(md) {
u64 size;
u64 end;
- /*
- * If a driver calls this after efi_free_boot_services,
- * ->map will be NULL, and the target may also not be mapped.
- * So just always get our own virtual map on the CPU.
- *
- */
- md = early_memremap(p, sizeof (*md));
- if (!md) {
- pr_err_once("early_memremap(%pa, %zu) failed.\n",
- &p, sizeof (*md));
- return -ENOMEM;
- }
-
if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
md->type != EFI_BOOT_SERVICES_DATA &&
md->type != EFI_RUNTIME_SERVICES_DATA) {
- early_memunmap(md, sizeof (*md));
continue;
}
@@ -404,11 +380,8 @@ int __init efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
end = md->phys_addr + size;
if (phys_addr >= md->phys_addr && phys_addr < end) {
memcpy(out_md, md, sizeof(*out_md));
- early_memunmap(md, sizeof (*md));
return 0;
}
-
- early_memunmap(md, sizeof (*md));
}
pr_err_once("requested map not found.\n");
return -ENOENT;
@@ -424,6 +397,35 @@ u64 __init efi_mem_desc_end(efi_memory_desc_t *md)
return end;
}
+void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
+
+/**
+ * efi_mem_reserve - Reserve an EFI memory region
+ * @addr: Physical address to reserve
+ * @size: Size of reservation
+ *
+ * Mark a region as reserved from general kernel allocation and
+ * prevent it being released by efi_free_boot_services().
+ *
+ * This function should be called drivers once they've parsed EFI
+ * configuration tables to figure out where their data lives, e.g.
+ * efi_esrt_init().
+ */
+void __init efi_mem_reserve(phys_addr_t addr, u64 size)
+{
+ if (!memblock_is_region_reserved(addr, size))
+ memblock_reserve(addr, size);
+
+ /*
+ * Some architectures (x86) reserve all boot services ranges
+ * until efi_free_boot_services() because of buggy firmware
+ * implementations. This means the above memblock_reserve() is
+ * superfluous on x86 and instead what it needs to do is
+ * ensure the @start, @size is not freed.
+ */
+ efi_arch_mem_reserve(addr, size);
+}
+
static __initdata efi_config_table_type_t common_tables[] = {
{ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
{ACPI_TABLE_GUID, "ACPI", &efi.acpi},
@@ -811,6 +813,9 @@ int efi_status_to_err(efi_status_t status)
case EFI_NOT_FOUND:
err = -ENOENT;
break;
+ case EFI_ABORTED:
+ err = -EINTR;
+ break;
default:
err = -EINVAL;
}
diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index 116b244dee68..3e626fd9bd4e 100644
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -510,7 +510,8 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
vendor = del_var->VendorGuid;
}
- efivar_entry_iter_begin();
+ if (efivar_entry_iter_begin())
+ return -EINTR;
entry = efivar_entry_find(name, vendor, &efivar_sysfs_list, true);
if (!entry)
err = -EINVAL;
@@ -575,7 +576,10 @@ efivar_create_sysfs_entry(struct efivar_entry *new_var)
return ret;
kobject_uevent(&new_var->kobj, KOBJ_ADD);
- efivar_entry_add(new_var, &efivar_sysfs_list);
+ if (efivar_entry_add(new_var, &efivar_sysfs_list)) {
+ efivar_unregister(new_var);
+ return -EINTR;
+ }
return 0;
}
@@ -690,7 +694,10 @@ static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor,
static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data)
{
- efivar_entry_remove(entry);
+ int err = efivar_entry_remove(entry);
+
+ if (err)
+ return err;
efivar_unregister(entry);
return 0;
}
@@ -698,7 +705,14 @@ static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data)
static void efivars_sysfs_exit(void)
{
/* Remove all entries and destroy */
- __efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list, NULL, NULL);
+ int err;
+
+ err = __efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list,
+ NULL, NULL);
+ if (err) {
+ pr_err("efivars: Failed to destroy sysfs entries\n");
+ return;
+ }
if (efivars_new_var)
sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var);
diff --git a/drivers/firmware/efi/esrt.c b/drivers/firmware/efi/esrt.c
index 75feb3f5829b..14914074f716 100644
--- a/drivers/firmware/efi/esrt.c
+++ b/drivers/firmware/efi/esrt.c
@@ -16,6 +16,7 @@
#include <linux/device.h>
#include <linux/efi.h>
#include <linux/init.h>
+#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/kobject.h>
#include <linux/list.h>
@@ -235,7 +236,7 @@ static struct attribute_group esrt_attr_group = {
};
/*
- * remap the table, copy it to kmalloced pages, and unmap it.
+ * remap the table, validate it, mark it reserved and unmap it.
*/
void __init efi_esrt_init(void)
{
@@ -335,7 +336,7 @@ void __init efi_esrt_init(void)
end = esrt_data + size;
pr_info("Reserving ESRT space from %pa to %pa.\n", &esrt_data, &end);
- memblock_reserve(esrt_data, esrt_data_size);
+ efi_mem_reserve(esrt_data, esrt_data_size);
pr_debug("esrt-init: loaded.\n");
err_memunmap:
@@ -382,28 +383,18 @@ static void cleanup_entry_list(void)
static int __init esrt_sysfs_init(void)
{
int error;
- struct efi_system_resource_table __iomem *ioesrt;
pr_debug("esrt-sysfs: loading.\n");
if (!esrt_data || !esrt_data_size)
return -ENOSYS;
- ioesrt = ioremap(esrt_data, esrt_data_size);
- if (!ioesrt) {
- pr_err("ioremap(%pa, %zu) failed.\n", &esrt_data,
- esrt_data_size);
- return -ENOMEM;
- }
-
- esrt = kmalloc(esrt_data_size, GFP_KERNEL);
+ esrt = memremap(esrt_data, esrt_data_size, MEMREMAP_WB);
if (!esrt) {
- pr_err("kmalloc failed. (wanted %zu bytes)\n", esrt_data_size);
- iounmap(ioesrt);
+ pr_err("memremap(%pa, %zu) failed.\n", &esrt_data,
+ esrt_data_size);
return -ENOMEM;
}
- memcpy_fromio(esrt, ioesrt, esrt_data_size);
-
esrt_kobj = kobject_create_and_add("esrt", efi_kobj);
if (!esrt_kobj) {
pr_err("Firmware table registration failed.\n");
@@ -429,8 +420,6 @@ static int __init esrt_sysfs_init(void)
if (error)
goto err_cleanup_list;
- memblock_remove(esrt_data, esrt_data_size);
-
pr_debug("esrt-sysfs: loaded.\n");
return 0;
diff --git a/drivers/firmware/efi/fake_mem.c b/drivers/firmware/efi/fake_mem.c
index 48430aba13c1..520a40e5e0e4 100644
--- a/drivers/firmware/efi/fake_mem.c
+++ b/drivers/firmware/efi/fake_mem.c
@@ -35,17 +35,13 @@
#define EFI_MAX_FAKEMEM CONFIG_EFI_MAX_FAKE_MEM
-struct fake_mem {
- struct range range;
- u64 attribute;
-};
-static struct fake_mem fake_mems[EFI_MAX_FAKEMEM];
+static struct efi_mem_range fake_mems[EFI_MAX_FAKEMEM];
static int nr_fake_mem;
static int __init cmp_fake_mem(const void *x1, const void *x2)
{
- const struct fake_mem *m1 = x1;
- const struct fake_mem *m2 = x2;
+ const struct efi_mem_range *m1 = x1;
+ const struct efi_mem_range *m2 = x2;
if (m1->range.start < m2->range.start)
return -1;
@@ -56,40 +52,21 @@ static int __init cmp_fake_mem(const void *x1, const void *x2)
void __init efi_fake_memmap(void)
{
- u64 start, end, m_start, m_end, m_attr;
int new_nr_map = efi.memmap.nr_map;
efi_memory_desc_t *md;
phys_addr_t new_memmap_phy;
void *new_memmap;
- void *old, *new;
int i;
- if (!nr_fake_mem || !efi_enabled(EFI_MEMMAP))
+ if (!nr_fake_mem)
return;
/* count up the number of EFI memory descriptor */
- for_each_efi_memory_desc(md) {
- start = md->phys_addr;
- end = start + (md->num_pages << EFI_PAGE_SHIFT) - 1;
-
- for (i = 0; i < nr_fake_mem; i++) {
- /* modifying range */
- m_start = fake_mems[i].range.start;
- m_end = fake_mems[i].range.end;
-
- if (m_start <= start) {
- /* split into 2 parts */
- if (start < m_end && m_end < end)
- new_nr_map++;
- }
- if (start < m_start && m_start < end) {
- /* split into 3 parts */
- if (m_end < end)
- new_nr_map += 2;
- /* split into 2 parts */
- if (end <= m_end)
- new_nr_map++;
- }
+ for (i = 0; i < nr_fake_mem; i++) {
+ for_each_efi_memory_desc(md) {
+ struct range *r = &fake_mems[i].range;
+
+ new_nr_map += efi_memmap_split_count(md, r);
}
}
@@ -107,85 +84,13 @@ void __init efi_fake_memmap(void)
return;
}
- for (old = efi.memmap.map, new = new_memmap;
- old < efi.memmap.map_end;
- old += efi.memmap.desc_size, new += efi.memmap.desc_size) {
-
- /* copy original EFI memory descriptor */
- memcpy(new, old, efi.memmap.desc_size);
- md = new;
- start = md->phys_addr;
- end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
-
- for (i = 0; i < nr_fake_mem; i++) {
- /* modifying range */
- m_start = fake_mems[i].range.start;
- m_end = fake_mems[i].range.end;
- m_attr = fake_mems[i].attribute;
-
- if (m_start <= start && end <= m_end)
- md->attribute |= m_attr;
-
- if (m_start <= start &&
- (start < m_end && m_end < end)) {
- /* first part */
- md->attribute |= m_attr;
- md->num_pages = (m_end - md->phys_addr + 1) >>
- EFI_PAGE_SHIFT;
- /* latter part */
- new += efi.memmap.desc_size;
- memcpy(new, old, efi.memmap.desc_size);
- md = new;
- md->phys_addr = m_end + 1;
- md->num_pages = (end - md->phys_addr + 1) >>
- EFI_PAGE_SHIFT;
- }
-
- if ((start < m_start && m_start < end) && m_end < end) {
- /* first part */
- md->num_pages = (m_start - md->phys_addr) >>
- EFI_PAGE_SHIFT;
- /* middle part */
- new += efi.memmap.desc_size;
- memcpy(new, old, efi.memmap.desc_size);
- md = new;
- md->attribute |= m_attr;
- md->phys_addr = m_start;
- md->num_pages = (m_end - m_start + 1) >>
- EFI_PAGE_SHIFT;
- /* last part */
- new += efi.memmap.desc_size;
- memcpy(new, old, efi.memmap.desc_size);
- md = new;
- md->phys_addr = m_end + 1;
- md->num_pages = (end - m_end) >>
- EFI_PAGE_SHIFT;
- }
-
- if ((start < m_start && m_start < end) &&
- (end <= m_end)) {
- /* first part */
- md->num_pages = (m_start - md->phys_addr) >>
- EFI_PAGE_SHIFT;
- /* latter part */
- new += efi.memmap.desc_size;
- memcpy(new, old, efi.memmap.desc_size);
- md = new;
- md->phys_addr = m_start;
- md->num_pages = (end - md->phys_addr + 1) >>
- EFI_PAGE_SHIFT;
- md->attribute |= m_attr;
- }
- }
- }
+ for (i = 0; i < nr_fake_mem; i++)
+ efi_memmap_insert(&efi.memmap, new_memmap, &fake_mems[i]);
/* swap into new EFI memmap */
- efi_unmap_memmap();
- efi.memmap.map = new_memmap;
- efi.memmap.phys_map = new_memmap_phy;
- efi.memmap.nr_map = new_nr_map;
- efi.memmap.map_end = efi.memmap.map + efi.memmap.nr_map * efi.memmap.desc_size;
- set_bit(EFI_MEMMAP, &efi.flags);
+ early_memunmap(new_memmap, efi.memmap.desc_size * new_nr_map);
+
+ efi_memmap_install(new_memmap_phy, new_nr_map);
/* print new EFI memmap */
efi_print_memmap();
@@ -223,7 +128,7 @@ static int __init setup_fake_mem(char *p)
p++;
}
- sort(fake_mems, nr_fake_mem, sizeof(struct fake_mem),
+ sort(fake_mems, nr_fake_mem, sizeof(struct efi_mem_range),
cmp_fake_mem, NULL);
for (i = 0; i < nr_fake_mem; i++)
diff --git a/drivers/firmware/efi/memmap.c b/drivers/firmware/efi/memmap.c
new file mode 100644
index 000000000000..cd96086fd851
--- /dev/null
+++ b/drivers/firmware/efi/memmap.c
@@ -0,0 +1,292 @@
+/*
+ * Common EFI memory map functions.
+ */
+
+#define pr_fmt(fmt) "efi: " fmt
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/efi.h>
+#include <linux/io.h>
+#include <asm/early_ioremap.h>
+
+/**
+ * __efi_memmap_init - Common code for mapping the EFI memory map
+ * @data: EFI memory map data
+ * @late: Use early or late mapping function?
+ *
+ * This function takes care of figuring out which function to use to
+ * map the EFI memory map in efi.memmap based on how far into the boot
+ * we are.
+ *
+ * During bootup @late should be %false since we only have access to
+ * the early_memremap*() functions as the vmalloc space isn't setup.
+ * Once the kernel is fully booted we can fallback to the more robust
+ * memremap*() API.
+ *
+ * Returns zero on success, a negative error code on failure.
+ */
+static int __init
+__efi_memmap_init(struct efi_memory_map_data *data, bool late)
+{
+ struct efi_memory_map map;
+ phys_addr_t phys_map;
+
+ if (efi_enabled(EFI_PARAVIRT))
+ return 0;
+
+ phys_map = data->phys_map;
+
+ if (late)
+ map.map = memremap(phys_map, data->size, MEMREMAP_WB);
+ else
+ map.map = early_memremap(phys_map, data->size);
+
+ if (!map.map) {
+ pr_err("Could not map the memory map!\n");
+ return -ENOMEM;
+ }
+
+ map.phys_map = data->phys_map;
+ map.nr_map = data->size / data->desc_size;
+ map.map_end = map.map + data->size;
+
+ map.desc_version = data->desc_version;
+ map.desc_size = data->desc_size;
+ map.late = late;
+
+ set_bit(EFI_MEMMAP, &efi.flags);
+
+ efi.memmap = map;
+
+ return 0;
+}
+
+/**
+ * efi_memmap_init_early - Map the EFI memory map data structure
+ * @data: EFI memory map data
+ *
+ * Use early_memremap() to map the passed in EFI memory map and assign
+ * it to efi.memmap.
+ */
+int __init efi_memmap_init_early(struct efi_memory_map_data *data)
+{
+ /* Cannot go backwards */
+ WARN_ON(efi.memmap.late);
+
+ return __efi_memmap_init(data, false);
+}
+
+void __init efi_memmap_unmap(void)
+{
+ if (!efi.memmap.late) {
+ unsigned long size;
+
+ size = efi.memmap.desc_size * efi.memmap.nr_map;
+ early_memunmap(efi.memmap.map, size);
+ } else {
+ memunmap(efi.memmap.map);
+ }
+
+ efi.memmap.map = NULL;
+ clear_bit(EFI_MEMMAP, &efi.flags);
+}
+
+/**
+ * efi_memmap_init_late - Map efi.memmap with memremap()
+ * @phys_addr: Physical address of the new EFI memory map
+ * @size: Size in bytes of the new EFI memory map
+ *
+ * Setup a mapping of the EFI memory map using ioremap_cache(). This
+ * function should only be called once the vmalloc space has been
+ * setup and is therefore not suitable for calling during early EFI
+ * initialise, e.g. in efi_init(). Additionally, it expects
+ * efi_memmap_init_early() to have already been called.
+ *
+ * The reason there are two EFI memmap initialisation
+ * (efi_memmap_init_early() and this late version) is because the
+ * early EFI memmap should be explicitly unmapped once EFI
+ * initialisation is complete as the fixmap space used to map the EFI
+ * memmap (via early_memremap()) is a scarce resource.
+ *
+ * This late mapping is intended to persist for the duration of
+ * runtime so that things like efi_mem_desc_lookup() and
+ * efi_mem_attributes() always work.
+ *
+ * Returns zero on success, a negative error code on failure.
+ */
+int __init efi_memmap_init_late(phys_addr_t addr, unsigned long size)
+{
+ struct efi_memory_map_data data = {
+ .phys_map = addr,
+ .size = size,
+ };
+
+ /* Did we forget to unmap the early EFI memmap? */
+ WARN_ON(efi.memmap.map);
+
+ /* Were we already called? */
+ WARN_ON(efi.memmap.late);
+
+ /*
+ * It makes no sense to allow callers to register different
+ * values for the following fields. Copy them out of the
+ * existing early EFI memmap.
+ */
+ data.desc_version = efi.memmap.desc_version;
+ data.desc_size = efi.memmap.desc_size;
+
+ return __efi_memmap_init(&data, true);
+}
+
+/**
+ * efi_memmap_install - Install a new EFI memory map in efi.memmap
+ * @addr: Physical address of the memory map
+ * @nr_map: Number of entries in the memory map
+ *
+ * Unlike efi_memmap_init_*(), this function does not allow the caller
+ * to switch from early to late mappings. It simply uses the existing
+ * mapping function and installs the new memmap.
+ *
+ * Returns zero on success, a negative error code on failure.
+ */
+int __init efi_memmap_install(phys_addr_t addr, unsigned int nr_map)
+{
+ struct efi_memory_map_data data;
+
+ efi_memmap_unmap();
+
+ data.phys_map = addr;
+ data.size = efi.memmap.desc_size * nr_map;
+ data.desc_version = efi.memmap.desc_version;
+ data.desc_size = efi.memmap.desc_size;
+
+ return __efi_memmap_init(&data, efi.memmap.late);
+}
+
+/**
+ * efi_memmap_split_count - Count number of additional EFI memmap entries
+ * @md: EFI memory descriptor to split
+ * @range: Address range (start, end) to split around
+ *
+ * Returns the number of additional EFI memmap entries required to
+ * accomodate @range.
+ */
+int __init efi_memmap_split_count(efi_memory_desc_t *md, struct range *range)
+{
+ u64 m_start, m_end;
+ u64 start, end;
+ int count = 0;
+
+ start = md->phys_addr;
+ end = start + (md->num_pages << EFI_PAGE_SHIFT) - 1;
+
+ /* modifying range */
+ m_start = range->start;
+ m_end = range->end;
+
+ if (m_start <= start) {
+ /* split into 2 parts */
+ if (start < m_end && m_end < end)
+ count++;
+ }
+
+ if (start < m_start && m_start < end) {
+ /* split into 3 parts */
+ if (m_end < end)
+ count += 2;
+ /* split into 2 parts */
+ if (end <= m_end)
+ count++;
+ }
+
+ return count;
+}
+
+/**
+ * efi_memmap_insert - Insert a memory region in an EFI memmap
+ * @old_memmap: The existing EFI memory map structure
+ * @buf: Address of buffer to store new map
+ * @mem: Memory map entry to insert
+ *
+ * It is suggested that you call efi_memmap_split_count() first
+ * to see how large @buf needs to be.
+ */
+void __init efi_memmap_insert(struct efi_memory_map *old_memmap, void *buf,
+ struct efi_mem_range *mem)
+{
+ u64 m_start, m_end, m_attr;
+ efi_memory_desc_t *md;
+ u64 start, end;
+ void *old, *new;
+
+ /* modifying range */
+ m_start = mem->range.start;
+ m_end = mem->range.end;
+ m_attr = mem->attribute;
+
+ for (old = old_memmap->map, new = buf;
+ old < old_memmap->map_end;
+ old += old_memmap->desc_size, new += old_memmap->desc_size) {
+
+ /* copy original EFI memory descriptor */
+ memcpy(new, old, old_memmap->desc_size);
+ md = new;
+ start = md->phys_addr;
+ end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
+
+ if (m_start <= start && end <= m_end)
+ md->attribute |= m_attr;
+
+ if (m_start <= start &&
+ (start < m_end && m_end < end)) {
+ /* first part */
+ md->attribute |= m_attr;
+ md->num_pages = (m_end - md->phys_addr + 1) >>
+ EFI_PAGE_SHIFT;
+ /* latter part */
+ new += old_memmap->desc_size;
+ memcpy(new, old, old_memmap->desc_size);
+ md = new;
+ md->phys_addr = m_end + 1;
+ md->num_pages = (end - md->phys_addr + 1) >>
+ EFI_PAGE_SHIFT;
+ }
+
+ if ((start < m_start && m_start < end) && m_end < end) {
+ /* first part */
+ md->num_pages = (m_start - md->phys_addr) >>
+ EFI_PAGE_SHIFT;
+ /* middle part */
+ new += old_memmap->desc_size;
+ memcpy(new, old, old_memmap->desc_size);
+ md = new;
+ md->attribute |= m_attr;
+ md->phys_addr = m_start;
+ md->num_pages = (m_end - m_start + 1) >>
+ EFI_PAGE_SHIFT;
+ /* last part */
+ new += old_memmap->desc_size;
+ memcpy(new, old, old_memmap->desc_size);
+ md = new;
+ md->phys_addr = m_end + 1;
+ md->num_pages = (end - m_end) >>
+ EFI_PAGE_SHIFT;
+ }
+
+ if ((start < m_start && m_start < end) &&
+ (end <= m_end)) {
+ /* first part */
+ md->num_pages = (m_start - md->phys_addr) >>
+ EFI_PAGE_SHIFT;
+ /* latter part */
+ new += old_memmap->desc_size;
+ memcpy(new, old, old_memmap->desc_size);
+ md = new;
+ md->phys_addr = m_start;
+ md->num_pages = (end - md->phys_addr + 1) >>
+ EFI_PAGE_SHIFT;
+ md->attribute |= m_attr;
+ }
+ }
+}
diff --git a/drivers/firmware/efi/runtime-map.c b/drivers/firmware/efi/runtime-map.c
index 5c55227a34c8..8e64b77aeac9 100644
--- a/drivers/firmware/efi/runtime-map.c
+++ b/drivers/firmware/efi/runtime-map.c
@@ -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;
diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c
index 41958774cde3..ae54870b2788 100644
--- a/drivers/firmware/efi/runtime-wrappers.c
+++ b/drivers/firmware/efi/runtime-wrappers.c
@@ -14,11 +14,13 @@
* This file is released under the GPLv2.
*/
+#define pr_fmt(fmt) "efi: " fmt
+
#include <linux/bug.h>
#include <linux/efi.h>
#include <linux/irqflags.h>
#include <linux/mutex.h>
-#include <linux/spinlock.h>
+#include <linux/semaphore.h>
#include <linux/stringify.h>
#include <asm/efi.h>
@@ -81,20 +83,21 @@ void efi_call_virt_check_flags(unsigned long flags, const char *call)
* +------------------------------------+-------------------------------+
*
* Due to the fact that the EFI pstore may write to the variable store in
- * interrupt context, we need to use a spinlock for at least the groups that
+ * interrupt context, we need to use a lock for at least the groups that
* contain SetVariable() and QueryVariableInfo(). That leaves little else, as
* none of the remaining functions are actually ever called at runtime.
- * So let's just use a single spinlock to serialize all Runtime Services calls.
+ * So let's just use a single lock to serialize all Runtime Services calls.
*/
-static DEFINE_SPINLOCK(efi_runtime_lock);
+static DEFINE_SEMAPHORE(efi_runtime_lock);
static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
efi_status_t status;
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock))
+ return EFI_ABORTED;
status = efi_call_virt(get_time, tm, tc);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -102,9 +105,10 @@ static efi_status_t virt_efi_set_time(efi_time_t *tm)
{
efi_status_t status;
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock))
+ return EFI_ABORTED;
status = efi_call_virt(set_time, tm);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -114,9 +118,10 @@ static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
{
efi_status_t status;
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock))
+ return EFI_ABORTED;
status = efi_call_virt(get_wakeup_time, enabled, pending, tm);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -124,9 +129,10 @@ static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
{
efi_status_t status;
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock))
+ return EFI_ABORTED;
status = efi_call_virt(set_wakeup_time, enabled, tm);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -138,10 +144,11 @@ static efi_status_t virt_efi_get_variable(efi_char16_t *name,
{
efi_status_t status;
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock))
+ return EFI_ABORTED;
status = efi_call_virt(get_variable, name, vendor, attr, data_size,
data);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -151,9 +158,10 @@ static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
{
efi_status_t status;
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock))
+ return EFI_ABORTED;
status = efi_call_virt(get_next_variable, name_size, name, vendor);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -165,10 +173,11 @@ static efi_status_t virt_efi_set_variable(efi_char16_t *name,
{
efi_status_t status;
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock))
+ return EFI_ABORTED;
status = efi_call_virt(set_variable, name, vendor, attr, data_size,
data);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -179,12 +188,12 @@ virt_efi_set_variable_nonblocking(efi_char16_t *name, efi_guid_t *vendor,
{
efi_status_t status;
- if (!spin_trylock(&efi_runtime_lock))
+ if (down_trylock(&efi_runtime_lock))
return EFI_NOT_READY;
status = efi_call_virt(set_variable, name, vendor, attr, data_size,
data);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -199,10 +208,11 @@ static efi_status_t virt_efi_query_variable_info(u32 attr,
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock))
+ return EFI_ABORTED;
status = efi_call_virt(query_variable_info, attr, storage_space,
remaining_space, max_variable_size);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -217,12 +227,12 @@ virt_efi_query_variable_info_nonblocking(u32 attr,
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
- if (!spin_trylock(&efi_runtime_lock))
+ if (down_trylock(&efi_runtime_lock))
return EFI_NOT_READY;
status = efi_call_virt(query_variable_info, attr, storage_space,
remaining_space, max_variable_size);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -230,9 +240,10 @@ static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
{
efi_status_t status;
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock))
+ return EFI_ABORTED;
status = efi_call_virt(get_next_high_mono_count, count);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -241,9 +252,13 @@ static void virt_efi_reset_system(int reset_type,
unsigned long data_size,
efi_char16_t *data)
{
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock)) {
+ pr_warn("failed to invoke the reset_system() runtime service:\n"
+ "could not get exclusive access to the firmware\n");
+ return;
+ }
__efi_call_virt(reset_system, reset_type, status, data_size, data);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
}
static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
@@ -255,9 +270,10 @@ static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock))
+ return EFI_ABORTED;
status = efi_call_virt(update_capsule, capsules, count, sg_list);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
@@ -271,10 +287,11 @@ static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
- spin_lock(&efi_runtime_lock);
+ if (down_interruptible(&efi_runtime_lock))
+ return EFI_ABORTED;
status = efi_call_virt(query_capsule_caps, capsules, count, max_size,
reset_type);
- spin_unlock(&efi_runtime_lock);
+ up(&efi_runtime_lock);
return status;
}
diff --git a/drivers/firmware/efi/test/Makefile b/drivers/firmware/efi/test/Makefile
new file mode 100644
index 000000000000..bcd4577d40e6
--- /dev/null
+++ b/drivers/firmware/efi/test/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_EFI_TEST) += efi_test.o
diff --git a/drivers/firmware/efi/test/efi_test.c b/drivers/firmware/efi/test/efi_test.c
new file mode 100644
index 000000000000..f61bb52be318
--- /dev/null
+++ b/drivers/firmware/efi/test/efi_test.c
@@ -0,0 +1,749 @@
+/*
+ * EFI Test Driver for Runtime Services
+ *
+ * Copyright(C) 2012-2016 Canonical Ltd.
+ *
+ * This driver exports EFI runtime services interfaces into userspace, which
+ * allow to use and test UEFI runtime services provided by firmware.
+ *
+ */
+
+#include <linux/version.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/efi.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include "efi_test.h"
+
+MODULE_AUTHOR("Ivan Hu <ivan.hu@canonical.com>");
+MODULE_DESCRIPTION("EFI Test Driver");
+MODULE_LICENSE("GPL");
+
+/*
+ * Count the bytes in 'str', including the terminating NULL.
+ *
+ * Note this function returns the number of *bytes*, not the number of
+ * ucs2 characters.
+ */
+static inline size_t user_ucs2_strsize(efi_char16_t __user *str)
+{
+ efi_char16_t *s = str, c;
+ size_t len;
+
+ if (!str)
+ return 0;
+
+ /* Include terminating NULL */
+ len = sizeof(efi_char16_t);
+
+ if (get_user(c, s++)) {
+ /* Can't read userspace memory for size */
+ return 0;
+ }
+
+ while (c != 0) {
+ if (get_user(c, s++)) {
+ /* Can't read userspace memory for size */
+ return 0;
+ }
+ len += sizeof(efi_char16_t);
+ }
+ return len;
+}
+
+/*
+ * Allocate a buffer and copy a ucs2 string from user space into it.
+ */
+static inline int
+copy_ucs2_from_user_len(efi_char16_t **dst, efi_char16_t __user *src,
+ size_t len)
+{
+ efi_char16_t *buf;
+
+ if (!src) {
+ *dst = NULL;
+ return 0;
+ }
+
+ if (!access_ok(VERIFY_READ, src, 1))
+ return -EFAULT;
+
+ buf = kmalloc(len, GFP_KERNEL);
+ if (!buf) {
+ *dst = NULL;
+ return -ENOMEM;
+ }
+ *dst = buf;
+
+ if (copy_from_user(*dst, src, len)) {
+ kfree(buf);
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+/*
+ * Count the bytes in 'str', including the terminating NULL.
+ *
+ * Just a wrap for user_ucs2_strsize
+ */
+static inline int
+get_ucs2_strsize_from_user(efi_char16_t __user *src, size_t *len)
+{
+ if (!access_ok(VERIFY_READ, src, 1))
+ return -EFAULT;
+
+ *len = user_ucs2_strsize(src);
+ if (*len == 0)
+ return -EFAULT;
+
+ return 0;
+}
+
+/*
+ * Calculate the required buffer allocation size and copy a ucs2 string
+ * from user space into it.
+ *
+ * This function differs from copy_ucs2_from_user_len() because it
+ * calculates the size of the buffer to allocate by taking the length of
+ * the string 'src'.
+ *
+ * If a non-zero value is returned, the caller MUST NOT access 'dst'.
+ *
+ * It is the caller's responsibility to free 'dst'.
+ */
+static inline int
+copy_ucs2_from_user(efi_char16_t **dst, efi_char16_t __user *src)
+{
+ size_t len;
+
+ if (!access_ok(VERIFY_READ, src, 1))
+ return -EFAULT;
+
+ len = user_ucs2_strsize(src);
+ if (len == 0)
+ return -EFAULT;
+ return copy_ucs2_from_user_len(dst, src, len);
+}
+
+/*
+ * Copy a ucs2 string to a user buffer.
+ *
+ * This function is a simple wrapper around copy_to_user() that does
+ * nothing if 'src' is NULL, which is useful for reducing the amount of
+ * NULL checking the caller has to do.
+ *
+ * 'len' specifies the number of bytes to copy.
+ */
+static inline int
+copy_ucs2_to_user_len(efi_char16_t __user *dst, efi_char16_t *src, size_t len)
+{
+ if (!src)
+ return 0;
+
+ if (!access_ok(VERIFY_WRITE, dst, 1))
+ return -EFAULT;
+
+ return copy_to_user(dst, src, len);
+}
+
+static long efi_runtime_get_variable(unsigned long arg)
+{
+ struct efi_getvariable __user *getvariable_user;
+ struct efi_getvariable getvariable;
+ unsigned long datasize, prev_datasize, *dz;
+ efi_guid_t vendor_guid, *vd = NULL;
+ efi_status_t status;
+ efi_char16_t *name = NULL;
+ u32 attr, *at;
+ void *data = NULL;
+ int rv = 0;
+
+ getvariable_user = (struct efi_getvariable __user *)arg;
+
+ if (copy_from_user(&getvariable, getvariable_user,
+ sizeof(getvariable)))
+ return -EFAULT;
+ if (getvariable.data_size &&
+ get_user(datasize, getvariable.data_size))
+ return -EFAULT;
+ if (getvariable.vendor_guid) {
+ if (copy_from_user(&vendor_guid, getvariable.vendor_guid,
+ sizeof(vendor_guid)))
+ return -EFAULT;
+ vd = &vendor_guid;
+ }
+
+ if (getvariable.variable_name) {
+ rv = copy_ucs2_from_user(&name, getvariable.variable_name);
+ if (rv)
+ return rv;
+ }
+
+ at = getvariable.attributes ? &attr : NULL;
+ dz = getvariable.data_size ? &datasize : NULL;
+
+ if (getvariable.data_size && getvariable.data) {
+ data = kmalloc(datasize, GFP_KERNEL);
+ if (!data) {
+ kfree(name);
+ return -ENOMEM;
+ }
+ }
+
+ prev_datasize = datasize;
+ status = efi.get_variable(name, vd, at, dz, data);
+ kfree(name);
+
+ if (put_user(status, getvariable.status)) {
+ rv = -EFAULT;
+ goto out;
+ }
+
+ if (status != EFI_SUCCESS) {
+ if (status == EFI_BUFFER_TOO_SMALL) {
+ if (dz && put_user(datasize, getvariable.data_size)) {
+ rv = -EFAULT;
+ goto out;
+ }
+ }
+ rv = -EINVAL;
+ goto out;
+ }
+
+ if (prev_datasize < datasize) {
+ rv = -EINVAL;
+ goto out;
+ }
+
+ if (data) {
+ if (copy_to_user(getvariable.data, data, datasize)) {
+ rv = -EFAULT;
+ goto out;
+ }
+ }
+
+ if (at && put_user(attr, getvariable.attributes)) {
+ rv = -EFAULT;
+ goto out;
+ }
+
+ if (dz && put_user(datasize, getvariable.data_size))
+ rv = -EFAULT;
+
+out:
+ kfree(data);
+ return rv;
+
+}
+
+static long efi_runtime_set_variable(unsigned long arg)
+{
+ struct efi_setvariable __user *setvariable_user;
+ struct efi_setvariable setvariable;
+ efi_guid_t vendor_guid;
+ efi_status_t status;
+ efi_char16_t *name = NULL;
+ void *data;
+ int rv = 0;
+
+ setvariable_user = (struct efi_setvariable __user *)arg;
+
+ if (copy_from_user(&setvariable, setvariable_user, sizeof(setvariable)))
+ return -EFAULT;
+ if (copy_from_user(&vendor_guid, setvariable.vendor_guid,
+ sizeof(vendor_guid)))
+ return -EFAULT;
+
+ if (setvariable.variable_name) {
+ rv = copy_ucs2_from_user(&name, setvariable.variable_name);
+ if (rv)
+ return rv;
+ }
+
+ data = kmalloc(setvariable.data_size, GFP_KERNEL);
+ if (!data) {
+ kfree(name);
+ return -ENOMEM;
+ }
+ if (copy_from_user(data, setvariable.data, setvariable.data_size)) {
+ rv = -EFAULT;
+ goto out;
+ }
+
+ status = efi.set_variable(name, &vendor_guid,
+ setvariable.attributes,
+ setvariable.data_size, data);
+
+ if (put_user(status, setvariable.status)) {
+ rv = -EFAULT;
+ goto out;
+ }
+
+ rv = status == EFI_SUCCESS ? 0 : -EINVAL;
+
+out:
+ kfree(data);
+ kfree(name);
+
+ return rv;
+}
+
+static long efi_runtime_get_time(unsigned long arg)
+{
+ struct efi_gettime __user *gettime_user;
+ struct efi_gettime gettime;
+ efi_status_t status;
+ efi_time_cap_t cap;
+ efi_time_t efi_time;
+
+ gettime_user = (struct efi_gettime __user *)arg;
+ if (copy_from_user(&gettime, gettime_user, sizeof(gettime)))
+ return -EFAULT;
+
+ status = efi.get_time(gettime.time ? &efi_time : NULL,
+ gettime.capabilities ? &cap : NULL);
+
+ if (put_user(status, gettime.status))
+ return -EFAULT;
+
+ if (status != EFI_SUCCESS)
+ return -EINVAL;
+
+ if (gettime.capabilities) {
+ efi_time_cap_t __user *cap_local;
+
+ cap_local = (efi_time_cap_t *)gettime.capabilities;
+ if (put_user(cap.resolution, &(cap_local->resolution)) ||
+ put_user(cap.accuracy, &(cap_local->accuracy)) ||
+ put_user(cap.sets_to_zero, &(cap_local->sets_to_zero)))
+ return -EFAULT;
+ }
+ if (gettime.time) {
+ if (copy_to_user(gettime.time, &efi_time, sizeof(efi_time_t)))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static long efi_runtime_set_time(unsigned long arg)
+{
+ struct efi_settime __user *settime_user;
+ struct efi_settime settime;
+ efi_status_t status;
+ efi_time_t efi_time;
+
+ settime_user = (struct efi_settime __user *)arg;
+ if (copy_from_user(&settime, settime_user, sizeof(settime)))
+ return -EFAULT;
+ if (copy_from_user(&efi_time, settime.time,
+ sizeof(efi_time_t)))
+ return -EFAULT;
+ status = efi.set_time(&efi_time);
+
+ if (put_user(status, settime.status))
+ return -EFAULT;
+
+ return status == EFI_SUCCESS ? 0 : -EINVAL;
+}
+
+static long efi_runtime_get_waketime(unsigned long arg)
+{
+ struct efi_getwakeuptime __user *getwakeuptime_user;
+ struct efi_getwakeuptime getwakeuptime;
+ efi_bool_t enabled, pending;
+ efi_status_t status;
+ efi_time_t efi_time;
+
+ getwakeuptime_user = (struct efi_getwakeuptime __user *)arg;
+ if (copy_from_user(&getwakeuptime, getwakeuptime_user,
+ sizeof(getwakeuptime)))
+ return -EFAULT;
+
+ status = efi.get_wakeup_time(
+ getwakeuptime.enabled ? (efi_bool_t *)&enabled : NULL,
+ getwakeuptime.pending ? (efi_bool_t *)&pending : NULL,
+ getwakeuptime.time ? &efi_time : NULL);
+
+ if (put_user(status, getwakeuptime.status))
+ return -EFAULT;
+
+ if (status != EFI_SUCCESS)
+ return -EINVAL;
+
+ if (getwakeuptime.enabled && put_user(enabled,
+ getwakeuptime.enabled))
+ return -EFAULT;
+
+ if (getwakeuptime.time) {
+ if (copy_to_user(getwakeuptime.time, &efi_time,
+ sizeof(efi_time_t)))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static long efi_runtime_set_waketime(unsigned long arg)
+{
+ struct efi_setwakeuptime __user *setwakeuptime_user;
+ struct efi_setwakeuptime setwakeuptime;
+ efi_bool_t enabled;
+ efi_status_t status;
+ efi_time_t efi_time;
+
+ setwakeuptime_user = (struct efi_setwakeuptime __user *)arg;
+
+ if (copy_from_user(&setwakeuptime, setwakeuptime_user,
+ sizeof(setwakeuptime)))
+ return -EFAULT;
+
+ enabled = setwakeuptime.enabled;
+ if (setwakeuptime.time) {
+ if (copy_from_user(&efi_time, setwakeuptime.time,
+ sizeof(efi_time_t)))
+ return -EFAULT;
+
+ status = efi.set_wakeup_time(enabled, &efi_time);
+ } else
+ status = efi.set_wakeup_time(enabled, NULL);
+
+ if (put_user(status, setwakeuptime.status))
+ return -EFAULT;
+
+ return status == EFI_SUCCESS ? 0 : -EINVAL;
+}
+
+static long efi_runtime_get_nextvariablename(unsigned long arg)
+{
+ struct efi_getnextvariablename __user *getnextvariablename_user;
+ struct efi_getnextvariablename getnextvariablename;
+ unsigned long name_size, prev_name_size = 0, *ns = NULL;
+ efi_status_t status;
+ efi_guid_t *vd = NULL;
+ efi_guid_t vendor_guid;
+ efi_char16_t *name = NULL;
+ int rv;
+
+ getnextvariablename_user = (struct efi_getnextvariablename __user *)arg;
+
+ if (copy_from_user(&getnextvariablename, getnextvariablename_user,
+ sizeof(getnextvariablename)))
+ return -EFAULT;
+
+ if (getnextvariablename.variable_name_size) {
+ if (get_user(name_size, getnextvariablename.variable_name_size))
+ return -EFAULT;
+ ns = &name_size;
+ prev_name_size = name_size;
+ }
+
+ if (getnextvariablename.vendor_guid) {
+ if (copy_from_user(&vendor_guid,
+ getnextvariablename.vendor_guid,
+ sizeof(vendor_guid)))
+ return -EFAULT;
+ vd = &vendor_guid;
+ }
+
+ if (getnextvariablename.variable_name) {
+ size_t name_string_size = 0;
+
+ rv = get_ucs2_strsize_from_user(
+ getnextvariablename.variable_name,
+ &name_string_size);
+ if (rv)
+ return rv;
+ /*
+ * The name_size may be smaller than the real buffer size where
+ * variable name located in some use cases. The most typical
+ * case is passing a 0 to get the required buffer size for the
+ * 1st time call. So we need to copy the content from user
+ * space for at least the string size of variable name, or else
+ * the name passed to UEFI may not be terminated as we expected.
+ */
+ rv = copy_ucs2_from_user_len(&name,
+ getnextvariablename.variable_name,
+ prev_name_size > name_string_size ?
+ prev_name_size : name_string_size);
+ if (rv)
+ return rv;
+ }
+
+ status = efi.get_next_variable(ns, name, vd);
+
+ if (put_user(status, getnextvariablename.status)) {
+ rv = -EFAULT;
+ goto out;
+ }
+
+ if (status != EFI_SUCCESS) {
+ if (status == EFI_BUFFER_TOO_SMALL) {
+ if (ns && put_user(*ns,
+ getnextvariablename.variable_name_size)) {
+ rv = -EFAULT;
+ goto out;
+ }
+ }
+ rv = -EINVAL;
+ goto out;
+ }
+
+ if (name) {
+ if (copy_ucs2_to_user_len(getnextvariablename.variable_name,
+ name, prev_name_size)) {
+ rv = -EFAULT;
+ goto out;
+ }
+ }
+
+ if (ns) {
+ if (put_user(*ns, getnextvariablename.variable_name_size)) {
+ rv = -EFAULT;
+ goto out;
+ }
+ }
+
+ if (vd) {
+ if (copy_to_user(getnextvariablename.vendor_guid, vd,
+ sizeof(efi_guid_t)))
+ rv = -EFAULT;
+ }
+
+out:
+ kfree(name);
+ return rv;
+}
+
+static long efi_runtime_get_nexthighmonocount(unsigned long arg)
+{
+ struct efi_getnexthighmonotoniccount __user *getnexthighmonocount_user;
+ struct efi_getnexthighmonotoniccount getnexthighmonocount;
+ efi_status_t status;
+ u32 count;
+
+ getnexthighmonocount_user = (struct
+ efi_getnexthighmonotoniccount __user *)arg;
+
+ if (copy_from_user(&getnexthighmonocount,
+ getnexthighmonocount_user,
+ sizeof(getnexthighmonocount)))
+ return -EFAULT;
+
+ status = efi.get_next_high_mono_count(
+ getnexthighmonocount.high_count ? &count : NULL);
+
+ if (put_user(status, getnexthighmonocount.status))
+ return -EFAULT;
+
+ if (status != EFI_SUCCESS)
+ return -EINVAL;
+
+ if (getnexthighmonocount.high_count &&
+ put_user(count, getnexthighmonocount.high_count))
+ return -EFAULT;
+
+ return 0;
+}
+
+static long efi_runtime_query_variableinfo(unsigned long arg)
+{
+ struct efi_queryvariableinfo __user *queryvariableinfo_user;
+ struct efi_queryvariableinfo queryvariableinfo;
+ efi_status_t status;
+ u64 max_storage, remaining, max_size;
+
+ queryvariableinfo_user = (struct efi_queryvariableinfo __user *)arg;
+
+ if (copy_from_user(&queryvariableinfo, queryvariableinfo_user,
+ sizeof(queryvariableinfo)))
+ return -EFAULT;
+
+ status = efi.query_variable_info(queryvariableinfo.attributes,
+ &max_storage, &remaining, &max_size);
+
+ if (put_user(status, queryvariableinfo.status))
+ return -EFAULT;
+
+ if (status != EFI_SUCCESS)
+ return -EINVAL;
+
+ if (put_user(max_storage,
+ queryvariableinfo.maximum_variable_storage_size))
+ return -EFAULT;
+
+ if (put_user(remaining,
+ queryvariableinfo.remaining_variable_storage_size))
+ return -EFAULT;
+
+ if (put_user(max_size, queryvariableinfo.maximum_variable_size))
+ return -EFAULT;
+
+ return 0;
+}
+
+static long efi_runtime_query_capsulecaps(unsigned long arg)
+{
+ struct efi_querycapsulecapabilities __user *qcaps_user;
+ struct efi_querycapsulecapabilities qcaps;
+ efi_capsule_header_t *capsules;
+ efi_status_t status;
+ u64 max_size;
+ int i, reset_type;
+ int rv = 0;
+
+ qcaps_user = (struct efi_querycapsulecapabilities __user *)arg;
+
+ if (copy_from_user(&qcaps, qcaps_user, sizeof(qcaps)))
+ return -EFAULT;
+
+ capsules = kcalloc(qcaps.capsule_count + 1,
+ sizeof(efi_capsule_header_t), GFP_KERNEL);
+ if (!capsules)
+ return -ENOMEM;
+
+ for (i = 0; i < qcaps.capsule_count; i++) {
+ efi_capsule_header_t *c;
+ /*
+ * We cannot dereference qcaps.capsule_header_array directly to
+ * obtain the address of the capsule as it resides in the
+ * user space
+ */
+ if (get_user(c, qcaps.capsule_header_array + i)) {
+ rv = -EFAULT;
+ goto out;
+ }
+ if (copy_from_user(&capsules[i], c,
+ sizeof(efi_capsule_header_t))) {
+ rv = -EFAULT;
+ goto out;
+ }
+ }
+
+ qcaps.capsule_header_array = &capsules;
+
+ status = efi.query_capsule_caps((efi_capsule_header_t **)
+ qcaps.capsule_header_array,
+ qcaps.capsule_count,
+ &max_size, &reset_type);
+
+ if (put_user(status, qcaps.status)) {
+ rv = -EFAULT;
+ goto out;
+ }
+
+ if (status != EFI_SUCCESS) {
+ rv = -EINVAL;
+ goto out;
+ }
+
+ if (put_user(max_size, qcaps.maximum_capsule_size)) {
+ rv = -EFAULT;
+ goto out;
+ }
+
+ if (put_user(reset_type, qcaps.reset_type))
+ rv = -EFAULT;
+
+out:
+ kfree(capsules);
+ return rv;
+}
+
+static long efi_test_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ switch (cmd) {
+ case EFI_RUNTIME_GET_VARIABLE:
+ return efi_runtime_get_variable(arg);
+
+ case EFI_RUNTIME_SET_VARIABLE:
+ return efi_runtime_set_variable(arg);
+
+ case EFI_RUNTIME_GET_TIME:
+ return efi_runtime_get_time(arg);
+
+ case EFI_RUNTIME_SET_TIME:
+ return efi_runtime_set_time(arg);
+
+ case EFI_RUNTIME_GET_WAKETIME:
+ return efi_runtime_get_waketime(arg);
+
+ case EFI_RUNTIME_SET_WAKETIME:
+ return efi_runtime_set_waketime(arg);
+
+ case EFI_RUNTIME_GET_NEXTVARIABLENAME:
+ return efi_runtime_get_nextvariablename(arg);
+
+ case EFI_RUNTIME_GET_NEXTHIGHMONOTONICCOUNT:
+ return efi_runtime_get_nexthighmonocount(arg);
+
+ case EFI_RUNTIME_QUERY_VARIABLEINFO:
+ return efi_runtime_query_variableinfo(arg);
+
+ case EFI_RUNTIME_QUERY_CAPSULECAPABILITIES:
+ return efi_runtime_query_capsulecaps(arg);
+ }
+
+ return -ENOTTY;
+}
+
+static int efi_test_open(struct inode *inode, struct file *file)
+{
+ /*
+ * nothing special to do here
+ * We do accept multiple open files at the same time as we
+ * synchronize on the per call operation.
+ */
+ return 0;
+}
+
+static int efi_test_close(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+/*
+ * The various file operations we support.
+ */
+static const struct file_operations efi_test_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = efi_test_ioctl,
+ .open = efi_test_open,
+ .release = efi_test_close,
+ .llseek = no_llseek,
+};
+
+static struct miscdevice efi_test_dev = {
+ MISC_DYNAMIC_MINOR,
+ "efi_test",
+ &efi_test_fops
+};
+
+static int __init efi_test_init(void)
+{
+ int ret;
+
+ ret = misc_register(&efi_test_dev);
+ if (ret) {
+ pr_err("efi_test: can't misc_register on minor=%d\n",
+ MISC_DYNAMIC_MINOR);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void __exit efi_test_exit(void)
+{
+ misc_deregister(&efi_test_dev);
+}
+
+module_init(efi_test_init);
+module_exit(efi_test_exit);
diff --git a/drivers/firmware/efi/test/efi_test.h b/drivers/firmware/efi/test/efi_test.h
new file mode 100644
index 000000000000..a33a6c633852
--- /dev/null
+++ b/drivers/firmware/efi/test/efi_test.h
@@ -0,0 +1,110 @@
+/*
+ * EFI Test driver Header
+ *
+ * Copyright(C) 2012-2016 Canonical Ltd.
+ *
+ */
+
+#ifndef _DRIVERS_FIRMWARE_EFI_TEST_H_
+#define _DRIVERS_FIRMWARE_EFI_TEST_H_
+
+#include <linux/efi.h>
+
+struct efi_getvariable {
+ efi_char16_t *variable_name;
+ efi_guid_t *vendor_guid;
+ u32 *attributes;
+ unsigned long *data_size;
+ void *data;
+ efi_status_t *status;
+} __packed;
+
+struct efi_setvariable {
+ efi_char16_t *variable_name;
+ efi_guid_t *vendor_guid;
+ u32 attributes;
+ unsigned long data_size;
+ void *data;
+ efi_status_t *status;
+} __packed;
+
+struct efi_getnextvariablename {
+ unsigned long *variable_name_size;
+ efi_char16_t *variable_name;
+ efi_guid_t *vendor_guid;
+ efi_status_t *status;
+} __packed;
+
+struct efi_queryvariableinfo {
+ u32 attributes;
+ u64 *maximum_variable_storage_size;
+ u64 *remaining_variable_storage_size;
+ u64 *maximum_variable_size;
+ efi_status_t *status;
+} __packed;
+
+struct efi_gettime {
+ efi_time_t *time;
+ efi_time_cap_t *capabilities;
+ efi_status_t *status;
+} __packed;
+
+struct efi_settime {
+ efi_time_t *time;
+ efi_status_t *status;
+} __packed;
+
+struct efi_getwakeuptime {
+ efi_bool_t *enabled;
+ efi_bool_t *pending;
+ efi_time_t *time;
+ efi_status_t *status;
+} __packed;
+
+struct efi_setwakeuptime {
+ efi_bool_t enabled;
+ efi_time_t *time;
+ efi_status_t *status;
+} __packed;
+
+struct efi_getnexthighmonotoniccount {
+ u32 *high_count;
+ efi_status_t *status;
+} __packed;
+
+struct efi_querycapsulecapabilities {
+ efi_capsule_header_t **capsule_header_array;
+ unsigned long capsule_count;
+ u64 *maximum_capsule_size;
+ int *reset_type;
+ efi_status_t *status;
+} __packed;
+
+#define EFI_RUNTIME_GET_VARIABLE \
+ _IOWR('p', 0x01, struct efi_getvariable)
+#define EFI_RUNTIME_SET_VARIABLE \
+ _IOW('p', 0x02, struct efi_setvariable)
+
+#define EFI_RUNTIME_GET_TIME \
+ _IOR('p', 0x03, struct efi_gettime)
+#define EFI_RUNTIME_SET_TIME \
+ _IOW('p', 0x04, struct efi_settime)
+
+#define EFI_RUNTIME_GET_WAKETIME \
+ _IOR('p', 0x05, struct efi_getwakeuptime)
+#define EFI_RUNTIME_SET_WAKETIME \
+ _IOW('p', 0x06, struct efi_setwakeuptime)
+
+#define EFI_RUNTIME_GET_NEXTVARIABLENAME \
+ _IOWR('p', 0x07, struct efi_getnextvariablename)
+
+#define EFI_RUNTIME_QUERY_VARIABLEINFO \
+ _IOR('p', 0x08, struct efi_queryvariableinfo)
+
+#define EFI_RUNTIME_GET_NEXTHIGHMONOTONICCOUNT \
+ _IOR('p', 0x09, struct efi_getnexthighmonotoniccount)
+
+#define EFI_RUNTIME_QUERY_CAPSULECAPABILITIES \
+ _IOR('p', 0x0A, struct efi_querycapsulecapabilities)
+
+#endif /* _DRIVERS_FIRMWARE_EFI_TEST_H_ */
diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c
index d3b751383286..9336ffdf6e2c 100644
--- a/drivers/firmware/efi/vars.c
+++ b/drivers/firmware/efi/vars.c
@@ -37,6 +37,14 @@
/* Private pointer to registered efivars */
static struct efivars *__efivars;
+/*
+ * efivars_lock protects three things:
+ * 1) efivarfs_list and efivars_sysfs_list
+ * 2) ->ops calls
+ * 3) (un)registration of __efivars
+ */
+static DEFINE_SEMAPHORE(efivars_lock);
+
static bool efivar_wq_enabled = true;
DECLARE_WORK(efivar_work, NULL);
EXPORT_SYMBOL_GPL(efivar_work);
@@ -434,7 +442,10 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
return -ENOMEM;
}
- spin_lock_irq(&__efivars->lock);
+ if (down_interruptible(&efivars_lock)) {
+ err = -EINTR;
+ goto free;
+ }
/*
* Per EFI spec, the maximum storage allocated for both
@@ -450,7 +461,7 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
switch (status) {
case EFI_SUCCESS:
if (duplicates)
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
variable_name_size = var_name_strnsize(variable_name,
variable_name_size);
@@ -476,8 +487,12 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
status = EFI_NOT_FOUND;
}
- if (duplicates)
- spin_lock_irq(&__efivars->lock);
+ if (duplicates) {
+ if (down_interruptible(&efivars_lock)) {
+ err = -EINTR;
+ goto free;
+ }
+ }
break;
case EFI_NOT_FOUND:
@@ -491,8 +506,8 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
} while (status != EFI_NOT_FOUND);
- spin_unlock_irq(&__efivars->lock);
-
+ up(&efivars_lock);
+free:
kfree(variable_name);
return err;
@@ -503,24 +518,34 @@ EXPORT_SYMBOL_GPL(efivar_init);
* efivar_entry_add - add entry to variable list
* @entry: entry to add to list
* @head: list head
+ *
+ * Returns 0 on success, or a kernel error code on failure.
*/
-void efivar_entry_add(struct efivar_entry *entry, struct list_head *head)
+int efivar_entry_add(struct efivar_entry *entry, struct list_head *head)
{
- spin_lock_irq(&__efivars->lock);
+ if (down_interruptible(&efivars_lock))
+ return -EINTR;
list_add(&entry->list, head);
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(efivar_entry_add);
/**
* efivar_entry_remove - remove entry from variable list
* @entry: entry to remove from list
+ *
+ * Returns 0 on success, or a kernel error code on failure.
*/
-void efivar_entry_remove(struct efivar_entry *entry)
+int efivar_entry_remove(struct efivar_entry *entry)
{
- spin_lock_irq(&__efivars->lock);
+ if (down_interruptible(&efivars_lock))
+ return -EINTR;
list_del(&entry->list);
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(efivar_entry_remove);
@@ -537,10 +562,8 @@ EXPORT_SYMBOL_GPL(efivar_entry_remove);
*/
static void efivar_entry_list_del_unlock(struct efivar_entry *entry)
{
- lockdep_assert_held(&__efivars->lock);
-
list_del(&entry->list);
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
}
/**
@@ -563,8 +586,6 @@ int __efivar_entry_delete(struct efivar_entry *entry)
const struct efivar_operations *ops = __efivars->ops;
efi_status_t status;
- lockdep_assert_held(&__efivars->lock);
-
status = ops->set_variable(entry->var.VariableName,
&entry->var.VendorGuid,
0, 0, NULL);
@@ -581,20 +602,22 @@ EXPORT_SYMBOL_GPL(__efivar_entry_delete);
* variable list. It is the caller's responsibility to free @entry
* once we return.
*
- * Returns 0 on success, or a converted EFI status code if
- * set_variable() fails.
+ * Returns 0 on success, -EINTR if we can't grab the semaphore,
+ * converted EFI status code if set_variable() fails.
*/
int efivar_entry_delete(struct efivar_entry *entry)
{
const struct efivar_operations *ops = __efivars->ops;
efi_status_t status;
- spin_lock_irq(&__efivars->lock);
+ if (down_interruptible(&efivars_lock))
+ return -EINTR;
+
status = ops->set_variable(entry->var.VariableName,
&entry->var.VendorGuid,
0, 0, NULL);
if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) {
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
return efi_status_to_err(status);
}
@@ -620,9 +643,9 @@ EXPORT_SYMBOL_GPL(efivar_entry_delete);
* If @head is not NULL a lookup is performed to determine whether
* the entry is already on the list.
*
- * Returns 0 on success, -EEXIST if a lookup is performed and the entry
- * already exists on the list, or a converted EFI status code if
- * set_variable() fails.
+ * Returns 0 on success, -EINTR if we can't grab the semaphore,
+ * -EEXIST if a lookup is performed and the entry already exists on
+ * the list, or a converted EFI status code if set_variable() fails.
*/
int efivar_entry_set(struct efivar_entry *entry, u32 attributes,
unsigned long size, void *data, struct list_head *head)
@@ -632,10 +655,10 @@ int efivar_entry_set(struct efivar_entry *entry, u32 attributes,
efi_char16_t *name = entry->var.VariableName;
efi_guid_t vendor = entry->var.VendorGuid;
- spin_lock_irq(&__efivars->lock);
-
+ if (down_interruptible(&efivars_lock))
+ return -EINTR;
if (head && efivar_entry_find(name, vendor, head, false)) {
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
return -EEXIST;
}
@@ -644,7 +667,7 @@ int efivar_entry_set(struct efivar_entry *entry, u32 attributes,
status = ops->set_variable(name, &vendor,
attributes, size, data);
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
return efi_status_to_err(status);
@@ -658,30 +681,29 @@ EXPORT_SYMBOL_GPL(efivar_entry_set);
* from crash/panic handlers.
*
* Crucially, this function will not block if it cannot acquire
- * __efivars->lock. Instead, it returns -EBUSY.
+ * efivars_lock. Instead, it returns -EBUSY.
*/
static int
efivar_entry_set_nonblocking(efi_char16_t *name, efi_guid_t vendor,
u32 attributes, unsigned long size, void *data)
{
const struct efivar_operations *ops = __efivars->ops;
- unsigned long flags;
efi_status_t status;
- if (!spin_trylock_irqsave(&__efivars->lock, flags))
+ if (down_trylock(&efivars_lock))
return -EBUSY;
status = check_var_size_nonblocking(attributes,
size + ucs2_strsize(name, 1024));
if (status != EFI_SUCCESS) {
- spin_unlock_irqrestore(&__efivars->lock, flags);
+ up(&efivars_lock);
return -ENOSPC;
}
status = ops->set_variable_nonblocking(name, &vendor, attributes,
size, data);
- spin_unlock_irqrestore(&__efivars->lock, flags);
+ up(&efivars_lock);
return efi_status_to_err(status);
}
@@ -706,7 +728,6 @@ int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes,
bool block, unsigned long size, void *data)
{
const struct efivar_operations *ops = __efivars->ops;
- unsigned long flags;
efi_status_t status;
if (!ops->query_variable_store)
@@ -727,21 +748,22 @@ int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes,
size, data);
if (!block) {
- if (!spin_trylock_irqsave(&__efivars->lock, flags))
+ if (down_trylock(&efivars_lock))
return -EBUSY;
} else {
- spin_lock_irqsave(&__efivars->lock, flags);
+ if (down_interruptible(&efivars_lock))
+ return -EINTR;
}
status = check_var_size(attributes, size + ucs2_strsize(name, 1024));
if (status != EFI_SUCCESS) {
- spin_unlock_irqrestore(&__efivars->lock, flags);
+ up(&efivars_lock);
return -ENOSPC;
}
status = ops->set_variable(name, &vendor, attributes, size, data);
- spin_unlock_irqrestore(&__efivars->lock, flags);
+ up(&efivars_lock);
return efi_status_to_err(status);
}
@@ -771,8 +793,6 @@ struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
int strsize1, strsize2;
bool found = false;
- lockdep_assert_held(&__efivars->lock);
-
list_for_each_entry_safe(entry, n, head, list) {
strsize1 = ucs2_strsize(name, 1024);
strsize2 = ucs2_strsize(entry->var.VariableName, 1024);
@@ -814,10 +834,11 @@ int efivar_entry_size(struct efivar_entry *entry, unsigned long *size)
*size = 0;
- spin_lock_irq(&__efivars->lock);
+ if (down_interruptible(&efivars_lock))
+ return -EINTR;
status = ops->get_variable(entry->var.VariableName,
&entry->var.VendorGuid, NULL, size, NULL);
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
if (status != EFI_BUFFER_TOO_SMALL)
return efi_status_to_err(status);
@@ -843,8 +864,6 @@ int __efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
const struct efivar_operations *ops = __efivars->ops;
efi_status_t status;
- lockdep_assert_held(&__efivars->lock);
-
status = ops->get_variable(entry->var.VariableName,
&entry->var.VendorGuid,
attributes, size, data);
@@ -866,11 +885,12 @@ int efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
const struct efivar_operations *ops = __efivars->ops;
efi_status_t status;
- spin_lock_irq(&__efivars->lock);
+ if (down_interruptible(&efivars_lock))
+ return -EINTR;
status = ops->get_variable(entry->var.VariableName,
&entry->var.VendorGuid,
attributes, size, data);
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
return efi_status_to_err(status);
}
@@ -917,7 +937,8 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
* set_variable call, and removal of the variable from the efivars
* list (in the case of an authenticated delete).
*/
- spin_lock_irq(&__efivars->lock);
+ if (down_interruptible(&efivars_lock))
+ return -EINTR;
/*
* Ensure that the available space hasn't shrunk below the safe level
@@ -957,7 +978,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
if (status == EFI_NOT_FOUND)
efivar_entry_list_del_unlock(entry);
else
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
if (status && status != EFI_BUFFER_TOO_SMALL)
return efi_status_to_err(status);
@@ -965,7 +986,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
return 0;
out:
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
return err;
}
@@ -978,9 +999,9 @@ EXPORT_SYMBOL_GPL(efivar_entry_set_get_size);
* efivar_entry_iter_end() is called. This function is usually used in
* conjunction with __efivar_entry_iter() or efivar_entry_iter().
*/
-void efivar_entry_iter_begin(void)
+int efivar_entry_iter_begin(void)
{
- spin_lock_irq(&__efivars->lock);
+ return down_interruptible(&efivars_lock);
}
EXPORT_SYMBOL_GPL(efivar_entry_iter_begin);
@@ -991,7 +1012,7 @@ EXPORT_SYMBOL_GPL(efivar_entry_iter_begin);
*/
void efivar_entry_iter_end(void)
{
- spin_unlock_irq(&__efivars->lock);
+ up(&efivars_lock);
}
EXPORT_SYMBOL_GPL(efivar_entry_iter_end);
@@ -1067,7 +1088,9 @@ int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
{
int err = 0;
- efivar_entry_iter_begin();
+ err = efivar_entry_iter_begin();
+ if (err)
+ return err;
err = __efivar_entry_iter(func, head, data, NULL);
efivar_entry_iter_end();
@@ -1112,12 +1135,18 @@ int efivars_register(struct efivars *efivars,
const struct efivar_operations *ops,
struct kobject *kobject)
{
- spin_lock_init(&efivars->lock);
+ if (down_interruptible(&efivars_lock))
+ return -EINTR;
+
efivars->ops = ops;
efivars->kobject = kobject;
__efivars = efivars;
+ pr_info("Registered efivars operations\n");
+
+ up(&efivars_lock);
+
return 0;
}
EXPORT_SYMBOL_GPL(efivars_register);
@@ -1133,6 +1162,9 @@ int efivars_unregister(struct efivars *efivars)
{
int rv;
+ if (down_interruptible(&efivars_lock))
+ return -EINTR;
+
if (!__efivars) {
printk(KERN_ERR "efivars not registered\n");
rv = -EINVAL;
@@ -1144,10 +1176,12 @@ int efivars_unregister(struct efivars *efivars)
goto out;
}
+ pr_info("Unregistered efivars operations\n");
__efivars = NULL;
rv = 0;
out:
+ up(&efivars_lock);
return rv;
}
EXPORT_SYMBOL_GPL(efivars_unregister);
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-24 13:20:34 +0300