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|
/* Copyright 2013-2018 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <skiboot.h>
#include <cpu.h>
#include <lock.h>
#include <opal.h>
#include <opal-msg.h>
#include <platform.h>
#include <device.h>
#include <libflash/libflash.h>
#include <libflash/libffs.h>
#include <libflash/blocklevel.h>
#include <libflash/ecc.h>
#include <libstb/secureboot.h>
#include <libstb/trustedboot.h>
#include <elf.h>
struct flash {
struct list_node list;
bool busy;
bool no_erase;
struct blocklevel_device *bl;
uint64_t size;
uint32_t block_size;
int id;
};
static LIST_HEAD(flashes);
static struct flash *system_flash;
/* Using a single lock as we only have one flash at present. */
static struct lock flash_lock;
/* nvram-on-flash support */
static struct flash *nvram_flash;
static u32 nvram_offset, nvram_size;
bool flash_reserve(void)
{
bool rc = false;
if (!try_lock(&flash_lock))
return false;
if (!system_flash->busy) {
system_flash->busy = true;
rc = true;
}
unlock(&flash_lock);
return rc;
}
void flash_release(void)
{
lock(&flash_lock);
system_flash->busy = false;
unlock(&flash_lock);
}
static int flash_nvram_info(uint32_t *total_size)
{
int rc;
lock(&flash_lock);
if (!nvram_flash) {
rc = OPAL_HARDWARE;
} else if (nvram_flash->busy) {
rc = OPAL_BUSY;
} else {
*total_size = nvram_size;
rc = OPAL_SUCCESS;
}
unlock(&flash_lock);
return rc;
}
static int flash_nvram_start_read(void *dst, uint32_t src, uint32_t len)
{
int rc;
if (!try_lock(&flash_lock))
return OPAL_BUSY;
if (!nvram_flash) {
rc = OPAL_HARDWARE;
goto out;
}
if (nvram_flash->busy) {
rc = OPAL_BUSY;
goto out;
}
if ((src + len) > nvram_size) {
prerror("FLASH_NVRAM: read out of bound (0x%x,0x%x)\n",
src, len);
rc = OPAL_PARAMETER;
goto out;
}
nvram_flash->busy = true;
unlock(&flash_lock);
rc = blocklevel_read(nvram_flash->bl, nvram_offset + src, dst, len);
lock(&flash_lock);
nvram_flash->busy = false;
out:
unlock(&flash_lock);
if (!rc)
nvram_read_complete(true);
return rc;
}
static int flash_nvram_write(uint32_t dst, void *src, uint32_t len)
{
int rc;
if (!try_lock(&flash_lock))
return OPAL_BUSY;
if (nvram_flash->busy) {
rc = OPAL_BUSY;
goto out;
}
/* TODO: When we have async jobs for PRD, turn this into one */
if ((dst + len) > nvram_size) {
prerror("FLASH_NVRAM: write out of bound (0x%x,0x%x)\n",
dst, len);
rc = OPAL_PARAMETER;
goto out;
}
nvram_flash->busy = true;
unlock(&flash_lock);
rc = blocklevel_write(nvram_flash->bl, nvram_offset + dst, src, len);
lock(&flash_lock);
nvram_flash->busy = false;
out:
unlock(&flash_lock);
return rc;
}
static int flash_nvram_probe(struct flash *flash, struct ffs_handle *ffs)
{
uint32_t start, size, part;
bool ecc;
int rc;
prlog(PR_INFO, "FLASH: probing for NVRAM\n");
rc = ffs_lookup_part(ffs, "NVRAM", &part);
if (rc) {
prlog(PR_WARNING, "FLASH: no NVRAM partition found\n");
return OPAL_HARDWARE;
}
rc = ffs_part_info(ffs, part, NULL,
&start, &size, NULL, &ecc);
if (rc) {
/**
* @fwts-label NVRAMNoPartition
* @fwts-advice OPAL could not find an NVRAM partition
* on the system flash. Check that the system flash
* has a valid partition table, and that the firmware
* build process has added a NVRAM partition.
*/
prlog(PR_ERR, "FLASH: Can't parse ffs info for NVRAM\n");
return OPAL_HARDWARE;
}
nvram_flash = flash;
nvram_offset = start;
nvram_size = ecc ? ecc_buffer_size_minus_ecc(size) : size;
platform.nvram_info = flash_nvram_info;
platform.nvram_start_read = flash_nvram_start_read;
platform.nvram_write = flash_nvram_write;
return 0;
}
/* core flash support */
static struct dt_node *flash_add_dt_node(struct flash *flash, int id)
{
struct dt_node *flash_node;
flash_node = dt_new_addr(opal_node, "flash", id);
dt_add_property_strings(flash_node, "compatible", "ibm,opal-flash");
dt_add_property_cells(flash_node, "ibm,opal-id", id);
dt_add_property_u64(flash_node, "reg", flash->size);
dt_add_property_cells(flash_node, "ibm,flash-block-size",
flash->block_size);
if (flash->no_erase)
dt_add_property(flash_node, "no-erase", NULL, 0);
/* we fix to 32-bits */
dt_add_property_cells(flash_node, "#address-cells", 1);
dt_add_property_cells(flash_node, "#size-cells", 1);
return flash_node;
}
static void setup_system_flash(struct flash *flash, struct dt_node *node,
const char *name, struct ffs_handle *ffs)
{
char *path;
if (!ffs)
return;
if (system_flash) {
/**
* @fwts-label SystemFlashMultiple
* @fwts-advice OPAL Found multiple system flash.
* Since we've already found a system flash we are
* going to use that one but this ordering is not
* guaranteed so may change in future.
*/
prlog(PR_WARNING, "FLASH: Attempted to register multiple system "
"flash: %s\n", name);
return;
}
prlog(PR_NOTICE, "FLASH: Found system flash: %s id:%i\n",
name, flash->id);
system_flash = flash;
path = dt_get_path(node);
dt_add_property_string(dt_chosen, "ibm,system-flash", path);
free(path);
prlog(PR_INFO, "FLASH: registered system flash device %s\n", name);
flash_nvram_probe(flash, ffs);
}
static int num_flashes(void)
{
struct flash *flash;
int i = 0;
list_for_each(&flashes, flash, list)
i++;
return i;
}
int flash_register(struct blocklevel_device *bl)
{
uint64_t size;
uint32_t block_size;
struct ffs_handle *ffs;
struct dt_node *node;
struct flash *flash;
const char *name;
int rc;
rc = blocklevel_get_info(bl, &name, &size, &block_size);
if (rc)
return rc;
prlog(PR_INFO, "FLASH: registering flash device %s "
"(size 0x%llx, blocksize 0x%x)\n",
name ?: "(unnamed)", size, block_size);
flash = malloc(sizeof(struct flash));
if (!flash) {
prlog(PR_ERR, "FLASH: Error allocating flash structure\n");
return OPAL_RESOURCE;
}
flash->busy = false;
flash->bl = bl;
flash->no_erase = !(bl->flags & WRITE_NEED_ERASE);
flash->size = size;
flash->block_size = block_size;
flash->id = num_flashes();
rc = ffs_init(0, flash->size, bl, &ffs, 1);
if (rc) {
/**
* @fwts-label NoFFS
* @fwts-advice System flash isn't formatted as expected.
* This could mean several OPAL utilities do not function
* as expected. e.g. gard, pflash.
*/
prlog(PR_WARNING, "FLASH: No ffs info; "
"using raw device only\n");
ffs = NULL;
}
node = flash_add_dt_node(flash, flash->id);
setup_system_flash(flash, node, name, ffs);
if (ffs)
ffs_close(ffs);
lock(&flash_lock);
list_add(&flashes, &flash->list);
unlock(&flash_lock);
return OPAL_SUCCESS;
}
enum flash_op {
FLASH_OP_READ,
FLASH_OP_WRITE,
FLASH_OP_ERASE,
};
static int64_t opal_flash_op(enum flash_op op, uint64_t id, uint64_t offset,
uint64_t buf, uint64_t size, uint64_t token)
{
struct flash *flash = NULL;
int rc;
if (!try_lock(&flash_lock))
return OPAL_BUSY;
list_for_each(&flashes, flash, list)
if (flash->id == id)
break;
if (flash->id != id) {
/* Couldn't find the flash */
rc = OPAL_PARAMETER;
goto err;
}
if (flash->busy) {
rc = OPAL_BUSY;
goto err;
}
if (size >= flash->size || offset >= flash->size
|| offset + size > flash->size) {
rc = OPAL_PARAMETER;
goto err;
}
/*
* These ops intentionally have no smarts (ecc correction or erase
* before write) to them.
* Skiboot is simply exposing the PNOR flash to the host.
* The host is expected to understand that this is a raw flash
* device and treat it as such.
*/
switch (op) {
case FLASH_OP_READ:
rc = blocklevel_raw_read(flash->bl, offset, (void *)buf, size);
break;
case FLASH_OP_WRITE:
rc = blocklevel_raw_write(flash->bl, offset, (void *)buf, size);
break;
case FLASH_OP_ERASE:
rc = blocklevel_erase(flash->bl, offset, size);
break;
default:
assert(0);
}
if (rc) {
rc = OPAL_HARDWARE;
goto err;
}
unlock(&flash_lock);
opal_queue_msg(OPAL_MSG_ASYNC_COMP, NULL, NULL, token, rc);
return OPAL_ASYNC_COMPLETION;
err:
unlock(&flash_lock);
return rc;
}
static int64_t opal_flash_read(uint64_t id, uint64_t offset, uint64_t buf,
uint64_t size, uint64_t token)
{
if (!opal_addr_valid((void *)buf))
return OPAL_PARAMETER;
return opal_flash_op(FLASH_OP_READ, id, offset, buf, size, token);
}
static int64_t opal_flash_write(uint64_t id, uint64_t offset, uint64_t buf,
uint64_t size, uint64_t token)
{
if (!opal_addr_valid((void *)buf))
return OPAL_PARAMETER;
return opal_flash_op(FLASH_OP_WRITE, id, offset, buf, size, token);
}
static int64_t opal_flash_erase(uint64_t id, uint64_t offset, uint64_t size,
uint64_t token)
{
return opal_flash_op(FLASH_OP_ERASE, id, offset, 0L, size, token);
}
opal_call(OPAL_FLASH_READ, opal_flash_read, 5);
opal_call(OPAL_FLASH_WRITE, opal_flash_write, 5);
opal_call(OPAL_FLASH_ERASE, opal_flash_erase, 4);
/* flash resource API */
static struct {
enum resource_id id;
uint32_t subid;
char name[PART_NAME_MAX+1];
} part_name_map[] = {
{ RESOURCE_ID_KERNEL, RESOURCE_SUBID_NONE, "BOOTKERNEL" },
{ RESOURCE_ID_INITRAMFS,RESOURCE_SUBID_NONE, "ROOTFS" },
{ RESOURCE_ID_CAPP, RESOURCE_SUBID_SUPPORTED, "CAPP" },
{ RESOURCE_ID_IMA_CATALOG, RESOURCE_SUBID_SUPPORTED, "IMA_CATALOG" },
{ RESOURCE_ID_VERSION, RESOURCE_SUBID_NONE, "VERSION" },
};
const char *flash_map_resource_name(enum resource_id id)
{
int i;
for (i = 0; i < ARRAY_SIZE(part_name_map); i++) {
if (part_name_map[i].id == id)
return part_name_map[i].name;
}
return NULL;
}
static size_t sizeof_elf_from_hdr(void *buf)
{
struct elf_hdr *elf = (struct elf_hdr*) buf;
size_t sz = 0;
BUILD_ASSERT(SECURE_BOOT_HEADERS_SIZE > sizeof(struct elf_hdr));
BUILD_ASSERT(SECURE_BOOT_HEADERS_SIZE > sizeof(struct elf64_hdr));
BUILD_ASSERT(SECURE_BOOT_HEADERS_SIZE > sizeof(struct elf32_hdr));
if (elf->ei_ident == ELF_IDENT) {
if (elf->ei_class == ELF_CLASS_64) {
struct elf64_hdr *elf64 = (struct elf64_hdr*) buf;
sz = le64_to_cpu(elf64->e_shoff) +
((uint32_t)le16_to_cpu(elf64->e_shentsize) *
(uint32_t)le16_to_cpu(elf64->e_shnum));
} else if (elf->ei_class == ELF_CLASS_32) {
struct elf32_hdr *elf32 = (struct elf32_hdr*) buf;
sz = le32_to_cpu(elf32->e_shoff) +
(le16_to_cpu(elf32->e_shentsize) *
le16_to_cpu(elf32->e_shnum));
}
}
return sz;
}
/*
* load a resource from FLASH
* buf and len shouldn't account for ECC even if partition is ECCed.
*
* The API here is a bit strange.
* If resource has a STB container, buf will contain it
* If loading subpartition with STB container, buff will *NOT* contain it
* For trusted boot, the whole partition containing the subpart is measured.
*
* Additionally, the logic to work out how much to read from flash is insane.
*/
static int flash_load_resource(enum resource_id id, uint32_t subid,
void *buf, size_t *len)
{
int i;
int rc = OPAL_RESOURCE;
struct ffs_handle *ffs;
struct flash *flash;
const char *name;
bool status = false;
bool ecc;
bool part_signed = false;
void *bufp = buf;
size_t bufsz = *len;
int ffs_part_num, ffs_part_start, ffs_part_size;
int content_size = 0;
int offset = 0;
lock(&flash_lock);
if (!system_flash) {
/**
* @fwts-label SystemFlashNotFound
* @fwts-advice No system flash was found. Check for missing
* calls flash_register(...).
*/
prlog(PR_WARNING, "FLASH: Can't load resource id:%i. "
"No system flash found\n", id);
goto out_unlock;
}
flash = system_flash;
if (flash->busy)
goto out_unlock;
for (i = 0, name = NULL; i < ARRAY_SIZE(part_name_map); i++) {
if (part_name_map[i].id == id) {
name = part_name_map[i].name;
break;
}
}
if (!name) {
prerror("FLASH: Couldn't find partition for id %d\n", id);
goto out_unlock;
}
/*
* If partition doesn't have a subindex but the caller specifies one,
* we fail. eg. kernel partition doesn't have a subindex
*/
if ((part_name_map[i].subid == RESOURCE_SUBID_NONE) &&
(subid != RESOURCE_SUBID_NONE)) {
prerror("PLAT: Partition %s doesn't have subindex\n", name);
goto out_unlock;
}
rc = ffs_init(0, flash->size, flash->bl, &ffs, 1);
if (rc) {
prerror("FLASH: Can't open ffs handle: %d\n", rc);
goto out_unlock;
}
rc = ffs_lookup_part(ffs, name, &ffs_part_num);
if (rc) {
/* This is not an error per-se, some partitions
* are purposefully absent, don't spam the logs
*/
prlog(PR_DEBUG, "FLASH: No %s partition\n", name);
goto out_free_ffs;
}
rc = ffs_part_info(ffs, ffs_part_num, NULL,
&ffs_part_start, NULL, &ffs_part_size, &ecc);
if (rc) {
prerror("FLASH: Failed to get %s partition info\n", name);
goto out_free_ffs;
}
prlog(PR_DEBUG,"FLASH: %s partition %s ECC\n",
name, ecc ? "has" : "doesn't have");
if (ffs_part_size < SECURE_BOOT_HEADERS_SIZE) {
prerror("FLASH: secboot headers bigger than "
"partition size 0x%x\n", ffs_part_size);
goto out_free_ffs;
}
rc = blocklevel_read(flash->bl, ffs_part_start, bufp,
SECURE_BOOT_HEADERS_SIZE);
if (rc) {
prerror("FLASH: failed to read the first 0x%x from "
"%s partition, rc %d\n", SECURE_BOOT_HEADERS_SIZE,
name, rc);
goto out_free_ffs;
}
part_signed = stb_is_container(bufp, SECURE_BOOT_HEADERS_SIZE);
prlog(PR_DEBUG, "FLASH: %s partition %s signed\n", name,
part_signed ? "is" : "isn't");
/*
* part_start/size are raw pointers into the partition.
* ie. they will account for ECC if included.
*/
if (part_signed) {
bufp += SECURE_BOOT_HEADERS_SIZE;
bufsz -= SECURE_BOOT_HEADERS_SIZE;
content_size = stb_sw_payload_size(buf, SECURE_BOOT_HEADERS_SIZE);
*len = content_size + SECURE_BOOT_HEADERS_SIZE;
if (content_size > bufsz) {
prerror("FLASH: content size > buffer size\n");
rc = OPAL_PARAMETER;
goto out_free_ffs;
}
ffs_part_start += SECURE_BOOT_HEADERS_SIZE;
rc = blocklevel_read(flash->bl, ffs_part_start, bufp,
content_size);
if (rc) {
prerror("FLASH: failed to read content size %d"
" %s partition, rc %d\n",
content_size, name, rc);
goto out_free_ffs;
}
if (subid == RESOURCE_SUBID_NONE)
goto done_reading;
rc = flash_subpart_info(bufp, content_size, ffs_part_size,
NULL, subid, &offset, &content_size);
if (rc) {
prerror("FLASH: Failed to parse subpart info for %s\n",
name);
goto out_free_ffs;
}
bufp += offset;
goto done_reading;
} else /* stb_signed */ {
/*
* Back to the old way of doing things, no STB header.
*/
if (subid == RESOURCE_SUBID_NONE) {
if (id == RESOURCE_ID_KERNEL ||
id == RESOURCE_ID_INITRAMFS) {
/*
* Because actualSize is a lie, we compute the
* size of the BOOTKERNEL based on what the ELF
* headers say. Otherwise we end up reading more
* than we should
*/
content_size = sizeof_elf_from_hdr(buf);
if (!content_size) {
prerror("FLASH: Invalid ELF header part"
" %s\n", name);
rc = OPAL_RESOURCE;
goto out_free_ffs;
}
} else {
content_size = ffs_part_size;
}
if (content_size > bufsz) {
prerror("FLASH: %s content size %d > "
" buffer size %lu\n", name,
content_size, bufsz);
rc = OPAL_PARAMETER;
goto out_free_ffs;
}
prlog(PR_DEBUG, "FLASH: computed %s size %u\n",
name, content_size);
rc = blocklevel_read(flash->bl, ffs_part_start,
buf, content_size);
if (rc) {
prerror("FLASH: failed to read content size %d"
" %s partition, rc %d\n",
content_size, name, rc);
goto out_free_ffs;
}
*len = content_size;
goto done_reading;
}
BUILD_ASSERT(FLASH_SUBPART_HEADER_SIZE <= SECURE_BOOT_HEADERS_SIZE);
rc = flash_subpart_info(bufp, SECURE_BOOT_HEADERS_SIZE,
ffs_part_size, &ffs_part_size, subid,
&offset, &content_size);
if (rc) {
prerror("FLASH: FAILED reading subpart info. rc=%d\n",
rc);
goto out_free_ffs;
}
*len = ffs_part_size;
prlog(PR_DEBUG, "FLASH: Computed %s partition size: %u "
"(subpart %u size %u offset %u)\n", name, ffs_part_size,
subid, content_size, offset);
/*
* For a sub partition, we read the whole (computed)
* partition, and then measure that.
* Afterwards, we memmove() things back into place for
* the caller.
*/
rc = blocklevel_read(flash->bl, ffs_part_start,
buf, ffs_part_size);
bufp += offset;
}
done_reading:
/*
* Verify and measure the retrieved PNOR partition as part of the
* secure boot and trusted boot requirements
*/
secureboot_verify(id, buf, *len);
trustedboot_measure(id, buf, *len);
/* Find subpartition */
if (subid != RESOURCE_SUBID_NONE) {
memmove(buf, bufp, content_size);
*len = content_size;
}
status = true;
out_free_ffs:
ffs_close(ffs);
out_unlock:
unlock(&flash_lock);
return status ? OPAL_SUCCESS : rc;
}
struct flash_load_resource_item {
enum resource_id id;
uint32_t subid;
int result;
void *buf;
size_t *len;
struct list_node link;
};
static LIST_HEAD(flash_load_resource_queue);
static LIST_HEAD(flash_loaded_resources);
static struct lock flash_load_resource_lock = LOCK_UNLOCKED;
static struct cpu_job *flash_load_job = NULL;
int flash_resource_loaded(enum resource_id id, uint32_t subid)
{
struct flash_load_resource_item *resource = NULL;
struct flash_load_resource_item *r;
int rc = OPAL_BUSY;
lock(&flash_load_resource_lock);
list_for_each(&flash_loaded_resources, r, link) {
if (r->id == id && r->subid == subid) {
resource = r;
break;
}
}
if (resource) {
rc = resource->result;
list_del(&resource->link);
free(resource);
}
if (list_empty(&flash_load_resource_queue) && flash_load_job) {
cpu_wait_job(flash_load_job, true);
flash_load_job = NULL;
}
unlock(&flash_load_resource_lock);
return rc;
}
static void flash_load_resources(void *data __unused)
{
struct flash_load_resource_item *r;
int result;
lock(&flash_load_resource_lock);
do {
if (list_empty(&flash_load_resource_queue)) {
break;
}
r = list_top(&flash_load_resource_queue,
struct flash_load_resource_item, link);
if (r->result != OPAL_EMPTY)
prerror("flash_load_resources() list_top unexpected "
" result %d\n", r->result);
r->result = OPAL_BUSY;
unlock(&flash_load_resource_lock);
result = flash_load_resource(r->id, r->subid, r->buf, r->len);
lock(&flash_load_resource_lock);
r = list_pop(&flash_load_resource_queue,
struct flash_load_resource_item, link);
r->result = result;
list_add_tail(&flash_loaded_resources, &r->link);
} while(true);
unlock(&flash_load_resource_lock);
}
static void start_flash_load_resource_job(void)
{
if (flash_load_job)
cpu_wait_job(flash_load_job, true);
flash_load_job = cpu_queue_job(NULL, "flash_load_resources",
flash_load_resources, NULL);
cpu_process_local_jobs();
}
int flash_start_preload_resource(enum resource_id id, uint32_t subid,
void *buf, size_t *len)
{
struct flash_load_resource_item *r;
bool start_thread = false;
r = malloc(sizeof(struct flash_load_resource_item));
assert(r != NULL);
r->id = id;
r->subid = subid;
r->buf = buf;
r->len = len;
r->result = OPAL_EMPTY;
prlog(PR_DEBUG, "FLASH: Queueing preload of %x/%x\n",
r->id, r->subid);
lock(&flash_load_resource_lock);
if (list_empty(&flash_load_resource_queue)) {
start_thread = true;
}
list_add_tail(&flash_load_resource_queue, &r->link);
unlock(&flash_load_resource_lock);
if (start_thread)
start_flash_load_resource_job();
return OPAL_SUCCESS;
}
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