u-boot/boot/bootdev-uclass.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2021 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEGORY UCLASS_BOOTSTD
#include <common.h>
#include <dm.h>
#include <bootdev.h>
#include <bootflow.h>
#include <bootmeth.h>
#include <bootstd.h>
#include <env.h>
#include <fs.h>
#include <log.h>
#include <malloc.h>
#include <part.h>
#include <sort.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/uclass-internal.h>
enum {
/*
* Set some sort of limit on the number of partitions a bootdev can
* have. Note that for disks this limits the partitions numbers that
* are scanned to 1..MAX_BOOTFLOWS_PER_BOOTDEV
*/
MAX_PART_PER_BOOTDEV = 30,
/* Maximum supported length of the "boot_targets" env string */
BOOT_TARGETS_MAX_LEN = 100,
};
int bootdev_add_bootflow(struct bootflow *bflow)
{
struct bootdev_uc_plat *ucp = dev_get_uclass_plat(bflow->dev);
struct bootstd_priv *std;
struct bootflow *new;
int ret;
assert(bflow->dev);
ret = bootstd_get_priv(&std);
if (ret)
return ret;
new = malloc(sizeof(*bflow));
if (!new)
return log_msg_ret("bflow", -ENOMEM);
memcpy(new, bflow, sizeof(*bflow));
list_add_tail(&new->glob_node, &std->glob_head);
list_add_tail(&new->bm_node, &ucp->bootflow_head);
return 0;
}
int bootdev_first_bootflow(struct udevice *dev, struct bootflow **bflowp)
{
struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);
if (list_empty(&ucp->bootflow_head))
return -ENOENT;
*bflowp = list_first_entry(&ucp->bootflow_head, struct bootflow,
bm_node);
return 0;
}
int bootdev_next_bootflow(struct bootflow **bflowp)
{
struct bootflow *bflow = *bflowp;
struct bootdev_uc_plat *ucp = dev_get_uclass_plat(bflow->dev);
*bflowp = NULL;
if (list_is_last(&bflow->bm_node, &ucp->bootflow_head))
return -ENOENT;
*bflowp = list_entry(bflow->bm_node.next, struct bootflow, bm_node);
return 0;
}
int bootdev_bind(struct udevice *parent, const char *drv_name, const char *name,
struct udevice **devp)
{
struct udevice *dev;
char dev_name[30];
char *str;
int ret;
snprintf(dev_name, sizeof(dev_name), "%s.%s", parent->name, name);
str = strdup(dev_name);
if (!str)
return -ENOMEM;
ret = device_bind_driver(parent, drv_name, str, &dev);
if (ret)
return ret;
device_set_name_alloced(dev);
*devp = dev;
return 0;
}
int bootdev_find_in_blk(struct udevice *dev, struct udevice *blk,
struct bootflow_iter *iter, struct bootflow *bflow)
{
struct blk_desc *desc = dev_get_uclass_plat(blk);
struct disk_partition info;
char partstr[20];
char name[60];
int ret;
/* Sanity check */
if (iter->part >= MAX_PART_PER_BOOTDEV)
return log_msg_ret("max", -ESHUTDOWN);
bflow->blk = blk;
if (iter->part)
snprintf(partstr, sizeof(partstr), "part_%x", iter->part);
else
strcpy(partstr, "whole");
snprintf(name, sizeof(name), "%s.%s", dev->name, partstr);
bflow->name = strdup(name);
if (!bflow->name)
return log_msg_ret("name", -ENOMEM);
bflow->part = iter->part;
ret = bootmeth_check(bflow->method, iter);
if (ret)
return log_msg_ret("check", ret);
/*
* partition numbers start at 0 so this cannot succeed, but it can tell
* us whether there is valid media there
*/
ret = part_get_info(desc, iter->part, &info);
if (!iter->part && ret == -ENOENT)
ret = 0;
/*
* This error indicates the media is not present. Otherwise we just
* blindly scan the next partition. We could be more intelligent here
* and check which partition numbers actually exist.
*/
if (ret == -EOPNOTSUPP)
ret = -ESHUTDOWN;
else
bflow->state = BOOTFLOWST_MEDIA;
if (ret)
return log_msg_ret("part", ret);
/*
* Currently we don't get the number of partitions, so just
* assume a large number
*/
iter->max_part = MAX_PART_PER_BOOTDEV;
if (iter->part) {
ret = fs_set_blk_dev_with_part(desc, bflow->part);
bflow->state = BOOTFLOWST_PART;
/* Use an #ifdef due to info.sys_ind */
#ifdef CONFIG_DOS_PARTITION
log_debug("%s: Found partition %x type %x fstype %d\n",
blk->name, bflow->part, info.sys_ind,
ret ? -1 : fs_get_type());
#endif
if (ret)
return log_msg_ret("fs", ret);
bflow->state = BOOTFLOWST_FS;
}
ret = bootmeth_read_bootflow(bflow->method, bflow);
if (ret)
return log_msg_ret("method", ret);
return 0;
}
void bootdev_list(bool probe)
{
struct udevice *dev;
int ret;
int i;
printf("Seq Probed Status Uclass Name\n");
printf("--- ------ ------ -------- ------------------\n");
if (probe)
ret = uclass_first_device_err(UCLASS_BOOTDEV, &dev);
else
ret = uclass_find_first_device(UCLASS_BOOTDEV, &dev);
for (i = 0; dev; i++) {
printf("%3x [ %c ] %6s %-9.9s %s\n", dev_seq(dev),
device_active(dev) ? '+' : ' ',
ret ? simple_itoa(ret) : "OK",
dev_get_uclass_name(dev_get_parent(dev)), dev->name);
if (probe)
ret = uclass_next_device_err(&dev);
else
ret = uclass_find_next_device(&dev);
}
printf("--- ------ ------ -------- ------------------\n");
printf("(%d bootdev%s)\n", i, i != 1 ? "s" : "");
}
int bootdev_setup_for_dev(struct udevice *parent, const char *drv_name)
{
struct udevice *bdev;
int ret;
ret = device_find_first_child_by_uclass(parent, UCLASS_BOOTDEV,
&bdev);
if (ret) {
if (ret != -ENODEV) {
log_debug("Cannot access bootdev device\n");
return ret;
}
ret = bootdev_bind(parent, drv_name, "bootdev", &bdev);
if (ret) {
log_debug("Cannot create bootdev device\n");
return ret;
}
}
return 0;
}
int bootdev_setup_sibling_blk(struct udevice *blk, const char *drv_name)
{
struct udevice *parent, *dev;
char dev_name[50];
int ret;
snprintf(dev_name, sizeof(dev_name), "%s.%s", blk->name, "bootdev");
parent = dev_get_parent(blk);
ret = device_find_child_by_name(parent, dev_name, &dev);
if (ret) {
char *str;
if (ret != -ENODEV) {
log_debug("Cannot access bootdev device\n");
return ret;
}
str = strdup(dev_name);
if (!str)
return -ENOMEM;
ret = device_bind_driver(parent, drv_name, str, &dev);
if (ret) {
log_debug("Cannot create bootdev device\n");
return ret;
}
device_set_name_alloced(dev);
}
return 0;
}
int bootdev_get_sibling_blk(struct udevice *dev, struct udevice **blkp)
{
struct udevice *parent = dev_get_parent(dev);
struct udevice *blk;
int ret, len;
char *p;
if (device_get_uclass_id(dev) != UCLASS_BOOTDEV)
return -EINVAL;
/* This should always work if bootdev_setup_sibling_blk() was used */
p = strstr(dev->name, ".bootdev");
if (!p)
return log_msg_ret("str", -EINVAL);
len = p - dev->name;
ret = device_find_child_by_namelen(parent, dev->name, len, &blk);
if (ret)
return log_msg_ret("find", ret);
*blkp = blk;
return 0;
}
static int bootdev_get_from_blk(struct udevice *blk, struct udevice **bootdevp)
{
struct udevice *parent = dev_get_parent(blk);
struct udevice *bootdev;
char dev_name[50];
int ret;
if (device_get_uclass_id(blk) != UCLASS_BLK)
return -EINVAL;
/* This should always work if bootdev_setup_sibling_blk() was used */
snprintf(dev_name, sizeof(dev_name), "%s.%s", blk->name, "bootdev");
ret = device_find_child_by_name(parent, dev_name, &bootdev);
if (ret)
return log_msg_ret("find", ret);
*bootdevp = bootdev;
return 0;
}
int bootdev_unbind_dev(struct udevice *parent)
{
struct udevice *dev;
int ret;
ret = device_find_first_child_by_uclass(parent, UCLASS_BOOTDEV, &dev);
if (!ret) {
ret = device_remove(dev, DM_REMOVE_NORMAL);
if (ret)
return log_msg_ret("rem", ret);
ret = device_unbind(dev);
if (ret)
return log_msg_ret("unb", ret);
}
return 0;
}
/**
* bootdev_find_by_label() - Convert a label string to a bootdev device
*
* Looks up a label name to find the associated bootdev. For example, if the
* label name is "mmc2", this will find a bootdev for an mmc device whose
* sequence number is 2.
*
* @label: Label string to convert, e.g. "mmc2"
* @devp: Returns bootdev device corresponding to that boot label
* Return: 0 if OK, -EINVAL if the label name (e.g. "mmc") does not refer to a
* uclass, -ENOENT if no bootdev for that media has the sequence number
* (e.g. 2)
*/
int bootdev_find_by_label(const char *label, struct udevice **devp)
{
struct udevice *media;
struct uclass *uc;
enum uclass_id id;
const char *end;
int seq;
seq = trailing_strtoln_end(label, NULL, &end);
id = uclass_get_by_namelen(label, end - label);
log_debug("find %s: seq=%d, id=%d/%s\n", label, seq, id,
uclass_get_name(id));
if (id == UCLASS_INVALID) {
log_warning("Unknown uclass '%s' in label\n", label);
return -EINVAL;
}
if (id == UCLASS_USB)
id = UCLASS_MASS_STORAGE;
/* Iterate through devices in the media uclass (e.g. UCLASS_MMC) */
uclass_id_foreach_dev(id, media, uc) {
struct udevice *bdev, *blk;
int ret;
/* if there is no seq, match anything */
if (seq != -1 && dev_seq(media) != seq) {
log_debug("- skip, media seq=%d\n", dev_seq(media));
continue;
}
ret = device_find_first_child_by_uclass(media, UCLASS_BOOTDEV,
&bdev);
if (ret) {
log_debug("- looking via blk, seq=%d, id=%d\n", seq,
id);
ret = blk_find_device(id, seq, &blk);
if (!ret) {
log_debug("- get from blk %s\n", blk->name);
ret = bootdev_get_from_blk(blk, &bdev);
}
}
if (!ret) {
log_debug("- found %s\n", bdev->name);
*devp = bdev;
return 0;
}
log_debug("- no device in %s\n", media->name);
}
log_warning("Unknown seq %d for label '%s'\n", seq, label);
return -ENOENT;
}
int bootdev_find_by_any(const char *name, struct udevice **devp)
{
struct udevice *dev;
int ret, seq;
char *endp;
seq = simple_strtol(name, &endp, 16);
/* Select by name, label or number */
if (*endp) {
ret = uclass_get_device_by_name(UCLASS_BOOTDEV, name, &dev);
if (ret == -ENODEV) {
ret = bootdev_find_by_label(name, &dev);
if (ret) {
printf("Cannot find bootdev '%s' (err=%d)\n",
name, ret);
return ret;
}
ret = device_probe(dev);
}
if (ret) {
printf("Cannot probe bootdev '%s' (err=%d)\n", name,
ret);
return ret;
}
} else {
ret = uclass_get_device_by_seq(UCLASS_BOOTDEV, seq, &dev);
}
if (ret) {
printf("Cannot find '%s' (err=%d)\n", name, ret);
return ret;
}
*devp = dev;
return 0;
}
int bootdev_get_bootflow(struct udevice *dev, struct bootflow_iter *iter,
struct bootflow *bflow)
{
const struct bootdev_ops *ops = bootdev_get_ops(dev);
if (!ops->get_bootflow)
return -ENOSYS;
memset(bflow, '\0', sizeof(*bflow));
bflow->dev = dev;
bflow->method = iter->method;
bflow->state = BOOTFLOWST_BASE;
return ops->get_bootflow(dev, iter, bflow);
}
void bootdev_clear_bootflows(struct udevice *dev)
{
struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);
while (!list_empty(&ucp->bootflow_head)) {
struct bootflow *bflow;
bflow = list_first_entry(&ucp->bootflow_head, struct bootflow,
bm_node);
bootflow_remove(bflow);
}
}
/**
* h_cmp_bootdev() - Compare two bootdevs to find out which should go first
*
* @v1: struct udevice * of first bootdev device
* @v2: struct udevice * of second bootdev device
* Return: sort order (<0 if dev1 < dev2, ==0 if equal, >0 if dev1 > dev2)
*/
static int h_cmp_bootdev(const void *v1, const void *v2)
{
const struct udevice *dev1 = *(struct udevice **)v1;
const struct udevice *dev2 = *(struct udevice **)v2;
const struct bootdev_uc_plat *ucp1 = dev_get_uclass_plat(dev1);
const struct bootdev_uc_plat *ucp2 = dev_get_uclass_plat(dev2);
int diff;
/* Use priority first */
diff = ucp1->prio - ucp2->prio;
if (diff)
return diff;
/* Fall back to seq for devices of the same priority */
diff = dev_seq(dev1) - dev_seq(dev2);
return diff;
}
/**
* build_order() - Build the ordered list of bootdevs to use
*
* This builds an ordered list of devices by one of three methods:
* - using the boot_targets environment variable, if non-empty
* - using the bootdev-order devicetree property, if present
* - sorted by priority and sequence number
*
* @bootstd: BOOTSTD device to use
* @order: Bootdevs listed in default order
* @max_count: Number of entries in @order
* Return: number of bootdevs found in the ordering, or -E2BIG if the
* boot_targets string is too long, or -EXDEV if the ordering produced 0 results
*/
static int build_order(struct udevice *bootstd, struct udevice **order,
int max_count)
{
const char *overflow_target = NULL;
const char *const *labels;
struct udevice *dev;
const char *targets;
int i, ret, count;
targets = env_get("boot_targets");
labels = IS_ENABLED(CONFIG_BOOTSTD_FULL) ?
bootstd_get_bootdev_order(bootstd) : NULL;
if (targets) {
char str[BOOT_TARGETS_MAX_LEN];
char *target;
if (strlen(targets) >= BOOT_TARGETS_MAX_LEN)
return log_msg_ret("len", -E2BIG);
/* make a copy of the string, since strok() will change it */
strcpy(str, targets);
for (i = 0, target = strtok(str, " "); target;
target = strtok(NULL, " ")) {
ret = bootdev_find_by_label(target, &dev);
if (!ret) {
if (i == max_count) {
overflow_target = target;
break;
}
order[i++] = dev;
}
}
count = i;
} else if (labels) {
int upto;
upto = 0;
for (i = 0; labels[i]; i++) {
ret = bootdev_find_by_label(labels[i], &dev);
if (!ret) {
if (upto == max_count) {
overflow_target = labels[i];
break;
}
order[upto++] = dev;
}
}
count = upto;
} else {
/* sort them into priority order */
count = max_count;
qsort(order, count, sizeof(struct udevice *), h_cmp_bootdev);
}
if (overflow_target) {
log_warning("Expected at most %d bootdevs, but overflowed with boot_target '%s'\n",
max_count, overflow_target);
}
if (!count)
return log_msg_ret("targ", -EXDEV);
return count;
}
int bootdev_setup_iter_order(struct bootflow_iter *iter, struct udevice **devp)
{
struct udevice *bootstd, *dev = *devp, **order;
int upto, i;
int count;
int ret;
ret = uclass_first_device_err(UCLASS_BOOTSTD, &bootstd);
if (ret) {
log_err("Missing bootstd device\n");
return log_msg_ret("std", ret);
}
/* Handle scanning a single device */
if (dev) {
iter->flags |= BOOTFLOWF_SINGLE_DEV;
return 0;
}
count = uclass_id_count(UCLASS_BOOTDEV);
if (!count)
return log_msg_ret("count", -ENOENT);
order = calloc(count, sizeof(struct udevice *));
if (!order)
return log_msg_ret("order", -ENOMEM);
/*
* Get a list of bootdevs, in seq order (i.e. using aliases). There may
* be gaps so try to count up high enough to find them all.
*/
for (i = 0, upto = 0; upto < count && i < 20 + count * 2; i++) {
ret = uclass_find_device_by_seq(UCLASS_BOOTDEV, i, &dev);
if (!ret)
order[upto++] = dev;
}
log_debug("Found %d bootdevs\n", count);
if (upto != count)
log_debug("Expected %d bootdevs, found %d using aliases\n",
count, upto);
count = build_order(bootstd, order, upto);
if (count < 0) {
free(order);
return log_msg_ret("build", count);
}
iter->dev_order = order;
iter->num_devs = count;
iter->cur_dev = 0;
dev = *order;
ret = device_probe(dev);
if (ret)
return log_msg_ret("probe", ret);
*devp = dev;
return 0;
}
static int bootdev_post_bind(struct udevice *dev)
{
struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);
INIT_LIST_HEAD(&ucp->bootflow_head);
return 0;
}
static int bootdev_pre_unbind(struct udevice *dev)
{
bootdev_clear_bootflows(dev);
return 0;
}
UCLASS_DRIVER(bootdev) = {
.id = UCLASS_BOOTDEV,
.name = "bootdev",
.flags = DM_UC_FLAG_SEQ_ALIAS,
.per_device_plat_auto = sizeof(struct bootdev_uc_plat),
.post_bind = bootdev_post_bind,
.pre_unbind = bootdev_pre_unbind,
};